JP2008048788A - Endoscope - Google Patents

Abstract

To provide an endoscope excellent in insertion property by making a curved shape of a curved portion having a first curved portion and a second curved portion into a smooth substantially curved shape.
An endoscope is provided on a distal end side of an insertion portion, and is connected to a proximal end side of at least a first bending portion and a first bending portion via a hook portion. A second bending portion 25 which is provided and bends in the vertical direction, first bending wires 5U and 5D for bending the first bending portion 24, and a second bending wire 7U for bending the second bending portion 25, 7D, first wire insertion coils 35U and 35D through which the first bending wires 5U and 5D are inserted, and second wire insertion coils 48U and 48D through which the second bending wires 7U and 7D are inserted. In the configuration in which the distal end portions of the insertion coils 35U and 35D are fixed to the lid portion 26, the distal end portions of the second bending wires 7U and 7D are fixed to the second bending wire constituting the first bending portion 24 or the second bending portion 25. It is fixed to the piece 4e.
[Selection] Figure 22

Description

  The present invention relates to an endoscope having a first bending portion and a second bending portion in a bending portion constituting an insertion portion.

  The endoscope has an elongated insertion portion. This insertion portion is inserted into a lumen such as the stomach or intestine. The lumen has a three-dimensionally complicated bent shape. For this reason, when the insertion part is inserted to the deep part in the lumen, it is necessary to bend the insertion part three-dimensionally along the lumen shape.

For example, Japanese Patent Application Laid-Open No. 2004-283618 discloses a first bending portion and a second bending portion configured by rotatably connecting a plurality of joint pieces to the distal end side of an elongated insertion portion, and a proximal end of the insertion portion. An endoscope including an operation portion provided with a bending knob for bending the first bending portion and the second bending portion on the side is shown. According to this endoscope, the first bending portion and the second bending portion are independently bent, so that insertion into a complicatedly bent lumen can be performed smoothly.
JP 2004-283618 A

  However, in the endoscope disclosed in Japanese Patent Application Laid-Open No. 2004-283618, the bending portion 100 is configured as shown in a diagram illustrating the configuration of the connecting portion between the first bending portion and the second bending portion in FIG. The first bending portion 110 and the second bending portion 120 are connected to each other via the bush member 130. And in this bending part 100, while the tip part of the 1st wire insertion coil 112 in which the 1st bending operation wire 111 for bending operation of the 1st bending part 110 is inserted in the button member 130 is fixed, the 1st The distal end portion of the second bending operation wire 121 for bending the second bending portion 120 is fixed.

  In this fixed state, it is necessary to arrange the distal end fixing position of the first wire insertion coil 112 and the distal end fixing position of the second bending operation wire 121 in correspondence with the bending direction as much as possible, for example, the vertical direction. For this reason, the distal end fixing position of the first wire insertion coil 112 and the distal end fixing position of the second bending operation wire 121 are displaced from each other in the axial direction.

  Therefore, the length dimension (L) of the jumper member 130 needs a fixing margin for fixing the first wire insertion coil 112 and a fixing margin for fixing the second bending operation wire 121. It was.

  Also, as shown in the drawing for explaining the bending state of the bending portion having the first bending portion and the second bending portion in FIG. 37, the bending portion 100 having the first bending portion 110 and the second bending portion 120 is bent. When this is done, the front and rear (portions shown by the dotted lines in the figure) of the jumper member 130 disposed between the first bending portion 110 and the second bending portion 120 are substantially linear, and are smooth substantially curved lines. The curved shape of the shape could not be obtained. This is because the length dimension of the jumper member 130, in other words, the hard length is long.

  The present invention has been made in view of the above circumstances, and provides an endoscope excellent in insertability by making a curved shape of a curved portion having a first curved portion and a second curved portion into a smooth substantially curved shape. It is aimed at that.

An endoscope according to the present invention is provided on a distal end side of an elongated insertion portion, and includes a first bending portion configured to be able to bend at least in a vertical direction by connecting a plurality of bending pieces, and a proximal end of the first bending portion A second bending portion that is connected to the side through a jumper portion and that is configured to bend at least in the vertical direction by connecting a plurality of bending pieces, and a first bending portion bending for bending the first bending portion An operation wire, a second bending portion bending operation wire for bending the second bending portion, a first wire insertion coil through which the first bending portion bending operation wire is inserted, and the second bending An endoscope comprising a second wire insertion coil through which a part bending operation wire is inserted,
In the configuration in which the distal end portion of the first wire insertion coil is fixed to the hook portion, the distal end portion of the second bending portion bending operation wire is fixed to the bending piece constituting the first bending portion or the second bending portion. is doing.
According to this configuration, the hook portion to which the distal end portion of the first wire insertion coil is fixed and the bending piece to which the distal end portion of the second bending portion bending operation wire is fixed are separate members. Accordingly, the length dimension of the jumper portion is a fixed margin necessary for fixing the distal end portion of the first wire insertion coil, which does not require a fixed margin for fixing the second bending portion bending operation wire. It becomes only.

  ADVANTAGE OF THE INVENTION According to this invention, the curved shape of the curved part which has a 1st curved part and a 2nd curved part can be implement | achieved, and the endoscope excellent in penetrability can be implement | achieved by making smooth curved shape.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 to FIG. 35 relate to an embodiment of the present invention, and FIG. 1 is a diagram for explaining an endoscope provided with a bending portion configured to have a first bending portion and a second bending portion in an insertion portion. 2 is a longitudinal sectional view for explaining the configuration of the bending portion, FIG. 3 is a view for explaining the configuration of the first bending portion on the proximal end side with respect to the second bending wire fixing piece, and FIG. 4 is a line AA in FIG. 5 is a cross-sectional view, FIG. 5 is a view showing a second bending wire fixing piece viewed from the direction of arrow B in FIG. 3, FIG. 6 is a cross-sectional view taken along line GG in FIG. 8 is a diagram illustrating the second bending wire fixing piece viewed from the direction of arrow C in FIG. 3, FIG. 9 is a diagram illustrating the up / down / left / right bending piece viewed from the direction of arrow D in FIG. 3, and FIG. FIG. 11 is a cross-sectional view taken along the line KK of FIG. 9, FIG. 12 is a view for explaining the vertical bending piece viewed from the direction of arrow E in FIG. 3, and FIG. Tip side of line section 14 is an explanatory cross-sectional view in which the base end side portion of the NN line cross-sectional view is combined, and FIG. 14 is a view for explaining the arrangement positional relationship of the wire guide members arranged in the first bending portion viewed from the direction of arrow F in FIG. FIG. 15 is an enlarged view for explaining the configuration in the vicinity of the hook portion provided in the bending portion, and FIG. 16 is a diagram for explaining the configuration in the vicinity of the hook portion provided in the bending portion as seen from the direction of arrow P in FIG. 17 is a cross-sectional view taken along the line Q-Q in FIG. 15, FIG. 18 is a front view of the ring member constituting the bush portion when viewed from the tip side, FIG. 19 is a cross-sectional view taken along the line RR in FIG. FIG. 21 is a cross-sectional view taken along the line S-S in FIG. 20, and FIG. 22 is a diagram illustrating the bending state of the bending portion in which the first bending portion and the second bending portion are connected by a jumper portion. FIG. 23 is a diagram for explaining the curved state of the curved portion where the stepped curved covering rubber is disposed, and FIG. 24 is the first diagram. FIG. 25 is a diagram illustrating a state in which the curved portion is curved and the distal end portion is disposed in the sigmoid colon; FIG. 25 is a second curved portion in which the first curved portion is curved and the distal end portion is disposed in the sigmoid colon. FIG. 26 is a diagram illustrating a state in which the insertion portion is introduced into the deep portion with a smooth curved shape in the vicinity of the hook portion connecting the first bending portion and the second bending portion. FIG. 27 is a diagram for explaining a state in which the first curved up / down knob is operated in addition to the second curved up / down knob and the tip portion is directed in the target direction, and FIG. 28 is a curved portion in which stepped curved covering rubber is arranged. FIG. 29 is a diagram illustrating the bending state of the bending portion where the stepped curved covering rubber is disposed, and FIG. 30 is a configuration example of the bending portion including a plurality of bending covering rubbers. FIG. 31 is a diagram illustrating a configuration example of a bending portion in which a plurality of curved covering rubbers are disposed; FIG. 32 is a diagram for explaining a configuration example of a bending portion in which a curved covering rubber and a stepped bending covering rubber are arranged, and FIG. 33 is a drawing of a bending portion in which the bending covering rubber is arranged on a net tube partially coated with an elastic adhesive. FIG. 34 is a diagram illustrating a configuration example, FIG. 34 is a diagram illustrating a configuration example of a curved portion in which a plurality of curved covering rubbers are arranged on a net tube partially coated with an elastic adhesive, and FIG. It is a figure explaining the structural example of the bending part which has arrange | positioned the some curve covering rubber | gum to the net pipe.

  As shown in FIG. 1, the endoscope 1 includes an elongated insertion portion 11, an operation portion 12 that also serves as a grip portion, and a universal cord 13. The insertion portion 11 is configured by connecting a distal end portion 21, a bending portion 22, and a long and flexible flexible tube portion 23 in order from the distal end side.

  The bending portion 22 of this embodiment includes a first bending portion 24 and a second bending portion 25. The 1st bending part 24 is provided in the front end side of the insertion part 11, and is comprised so that it can be bent in the up-down and left-right directions, for example. On the other hand, the second bending portion 25 is connected to the base end portion of the first bending portion 24 via a later-described jumper portion (reference numeral 26 in FIG. 2 and the like), and is configured to be bent in the vertical direction. ing.

The operation unit 12 includes a main bending operation unit 14 and a sub bending operation unit 15. The sub bending operation section 15 is provided on the proximal end side of the operation section 12 that is the upper side in the drawing from the main bending operation section 14, that is, on the opposite side of the insertion section 11.
The main bending operation portion 14 includes a first bending portion up / down operation knob (hereinafter abbreviated as a first bending up / down knob) 14a, and a first bending portion left / right operation knob (hereinafter abbreviated as a first bending left / right knob). 14b, a first bending portion up / down fixing lever (hereinafter abbreviated as a first bending up / down fixing lever) 14c, and a first bending portion left / right fixing knob (hereinafter abbreviated as a first bending left / right fixing knob) 14d, And an air / water supply button 16a, a suction operation button 16b, and a plurality of operation buttons 16c.

  The first bending up / down knob 14a is a knob for bending the first bending portion 24 in the up / down direction. The first bending left / right knob 14b is a knob for bending the first bending portion 24 in the left / right direction. The first bending up / down fixing lever 14c is a lever for fixing the first bending up / down knob 14a at a desired rotation position and maintaining the bending state of the first bending portion 24 in the up / down direction. The first bending left / right fixing knob 14d is a knob for fixing the first bending left / right knob 14b at a desired rotation position and maintaining the bending state of the first bending portion 24 in the left / right direction.

The air / water supply button 16a is a button for performing an air supply / water supply operation. The suction operation button 16b is a button for performing a suction operation. The plurality of operation buttons 16c are buttons for remotely operating a video processor (not shown).
Reference numeral 17 denotes a treatment instrument insertion port. The treatment instrument insertion port 17 is normally closed by a forceps plug 17a. The treatment instrument insertion port 17 communicates with a suction port (not shown) provided at the distal end portion 21 constituting the insertion portion 11 via a treatment instrument insertion channel tube (see reference numeral 53 in FIG. 17 described later). Yes.

  On the other hand, the secondary bending operation section 15 includes a second bending section up / down operation knob (hereinafter abbreviated as a second bending up / down knob) 15a and a second bending section up / down fixing knob (hereinafter referred to as a second bending up / down fixing knob). (Abbreviated) 15b. The second bending up / down knob 15a is a knob for bending the second bending portion 25 in the up / down direction. The second bending up / down fixing knob 15b is a knob for fixing the second bending up / down knob 15a at a desired rotation position and maintaining the bent state of the second bending portion 25 in the up / down direction.

  As shown in FIG. 2, the bending portion 22 includes a first bending portion 24 that connects a plurality of bending pieces, a second bending portion 25 that connects a plurality of bending pieces, a base end portion of the first bending portion 24, and a first end portion. 2 A joint part 26 that is connected to the tip of the curved part 25, a mesh pipe 27 that integrally covers the first curved part 24, the joint part 26, and the second curved part 25, and so that the mesh pipe 27 is covered. It is comprised by the curve covering rubber | gum 28 (it is hereafter described as the curve rubber | gum 28) arrange | positioned. The curved rubber 28 has a uniform thickness, the distal end portion of the generally curved rubber 28 is fixed to the distal end side portion of the first curved portion 24 by, for example, bobbin bonding, and the proximal end portion is the proximal end side of the second curved portion 25. It is fixed to the part by, for example, thread winding adhesion.

  That is, the net tube 27 and the curved rubber 28 in the present embodiment are set to have a length dimension that covers the first curved portion 24 and the second curved portion 25 together. On the other hand, in the structure which provided the 1st bending part and the 2nd bending part in the conventional bending part, the 1st bending part and the 2nd bending part comprised separately. That is, after covering the first mesh tube, the first curved rubber is thread-bonded and fixed to form the first curved part, and after covering the second mesh tube, the second curved rubber is thread-bonded and fixed. Thus, the second bending portion was configured. For this reason, in the bending part 22 which has the 1st bending part 24 and the 2nd bending part 25 of this embodiment, it has the structure which can aim at the reduction of a number of parts and the improvement of assembly property compared with the past.

  The first bending portion 24 includes a first bending portion tip piece 4a, a first bending portion second piece 4b, a plurality of vertical and horizontal bending pieces 4c, a plurality of vertical bending pieces 4d, and a second bending wire fixing piece 4e. And the first bending portion base end piece 4f. On the other hand, the second bending portion 25 is mainly composed of a second bending portion distal piece 5a, a plurality of vertical and horizontal bending pieces 5b, a plurality of vertical bending pieces 5c, and a second bending portion base piece 5d. Yes. The first bending portion base piece 4f and the second bending portion tip piece 5a are members constituting the joint portion 26.

First, the structure of the 1st bending part 24 is demonstrated with reference to FIG. 2 thru | or FIG.
As shown in FIG. 2, the first bending portion tip piece 4 a is disposed at the tip of the first bending portion 24. On the other hand, the first bending portion base end piece 4 f is disposed at the base end of the first bending portion 24. The first bending portion second piece 4b is connected to the first bending portion tip piece 4a. The second bending wire fixing piece 4 e is disposed in the middle of the first bending portion 24. Then, between the first bending portion second piece 4b and the second bending wire fixing piece 4e, and between the second bending wire fixing piece 4e and the first bending portion base piece 4f, The vertical bending piece 4d is appropriately arranged. This fact, together with the length dimension of the first bending portion 2 4 is set to the desired dimensions, smooth curved shape that is desired.

  The first bending portion tip piece 4a constituting the forefront of the first bending portion 24 is formed by processing a tubular member into a predetermined shape. A first bending wire arrangement bending portion (hereinafter, abbreviated as a first wire bending portion) 31 is provided in each of the vertical and horizontal directions which are predetermined portions of the first bending portion tip piece 4a. Each of the first wire cut portions 31 is pulled and loosened by the first bending up / down knob 14a and the first bending left / right knob 14b, and is used for bending the first bending portion corresponding to the down, left, and right directions, respectively. An end of a wire (hereinafter abbreviated as a first bending wire) is disposed. And the wire edge part of the state arrange | positioned at each 1st wire cutting part 31 is integrally fixed to the 1st bending part front piece 4a by brazing, for example.

  In the present embodiment, the first bending wire for the upward direction is described as the first bending wire 5U, the first bending wire for the downward direction is described as the first bending wire 5D, and the first bending wire for the left direction is used. The first bending wire 5L is described, and the first bending wire for the right direction is described as the first bending wire 5R. In the following description, U is described after the reference for the upward direction, D after the reference for the downward direction, and L after the reference for the left direction. For the right direction, R is written after the reference numeral, and the words for the upward direction, the downward direction, the left direction, and the right direction are omitted.

  A pair of connecting projections for connecting the first bending portion second piece 4b so as to be rotatable in the vertical direction are provided at a predetermined position on the base end side of the first bending portion distal piece 4a in an opposed positional relationship. . These connecting projections are provided with through holes in which rivets 6a and pins 6b, which are connecting members for pivotally supporting adjacent bending pieces, are disposed. The straight line connecting the center of the through hole of the connecting projection provided on the right side surface of the first bending portion tip piece 4a and the center of the through hole of the connecting projection provided on the left side is a vertical rotation axis. It corresponds.

  The first bending portion second piece 4b is formed by processing a tubular member into a predetermined shape, and is connected to the distal end side and the proximal end side of the adjacent bending pieces so as to be rotatable in the vertical direction. A pair of protrusions are provided in a positional relationship facing each other. The connecting projections are also provided with through holes in which rivets 6a and pins 6b for pivotally supporting adjacent bending pieces are provided. The straight line connecting the center of the through hole of the connecting projection provided on the right side of the first bending portion second piece 4b and the center of the through hole of the connecting projection provided on the left side is a vertical rotation axis. It corresponds to.

There are two types of the up / down / left / right bending pieces 4c, each of which is formed into a predetermined shape by processing a tubular member.
One type of up / down / left / right bending piece 4c is provided with a pair of connecting projections for connecting the adjacent pieces on the distal end side so as to be rotatable in the vertical direction. A pair of connecting projections for connecting the matching pieces so as to be rotatable in the left-right direction are provided in a positional relationship facing each other.

  On the other hand, the other type of up / down / left / right bending piece 4c is provided with a pair of connecting projections for connecting the adjacent pieces on the front end side so as to be turnable in the left / right direction. A pair of connecting projections for connecting the adjacent pieces on the end side so as to be pivotable in the vertical direction are provided in a positional relationship facing each other.

  Each connecting projection is provided with a through hole in which a rivet 6a and a pin 6b for pivotally supporting adjacent bending pieces are provided. A straight line connecting the center of the through hole of the connecting projection provided on the right side of the up / down / left / right bending piece 4c and the center of the through hole of the connecting projection provided on the left side corresponds to the vertical rotation axis. . The straight line connecting the center of the through hole of the connecting projection provided on the upper side surface of the up / down / left / right bending piece 4c and the center of the through hole of the connecting projection portion provided on the lower side is relative to the vertical rotation axis. Corresponds to the right and left rotation axis.

  The vertical bending piece 4d is formed by processing a tubular member into a predetermined shape, and at its distal end side and proximal end side, there are connecting projections for connecting adjacent pieces so as to be rotatable in the vertical direction. A pair is provided in a positional relationship facing each other. These connecting projections are provided with through holes in which rivets 6a and pins 6b for pivotally supporting the bending pieces are arranged. The straight line connecting the center of the through hole of the connecting projection provided on the right side of the vertical bending piece 4d and the center of the through hole of the connecting projection provided on the left side corresponds to the vertical rotation axis. Yes.

The first bending portion base end piece 4f is formed by processing a tubular member into a predetermined shape, and a pair of connecting protrusions for connecting the adjacent pieces on the distal end side so as to be rotatable in the vertical direction face each other. Are provided in a positional relationship. Then, a straight line connecting the center of the hole of coupling protrusions provided on the right side surface of the first curved portion proximal frame 4f, a center through hole of the coupling protrusions provided on the left side vertical pivot axis It corresponds to.

The second bending wire fixing piece 4e will be described with reference to FIGS.
As shown in FIGS. 2 to 4, 6, and 7, the second bending wire fixing piece 4 e includes a second wire on the distal end side upper side surface and the distal end side lower side surface in addition to the configuration of the upper and lower bending pieces 4 d. An arrangement cut and bent portion (hereinafter referred to as a second wire cut portion) 32 is provided. The second wire cutting portion 32 has an end portion of a second bending portion bending operation wire (hereinafter, abbreviated as a second bending wire) corresponding to the up and down direction operated by the second bending up / down knob 15a. Be placed. And the wire edge part of the state arrange | positioned at each 2nd wire cutting part 32 is integrally fixed to the 2nd bending wire fixing piece 4e by brazing, for example. In the present embodiment, the upward second bending wire is referred to as a second bending wire 7U, and the downward second bending wire is referred to as a second bending wire 7D.

  Tubular first wire guide members 8U and 8D through which the first bending wires 5U and 5D are inserted are integrally fixed to the proximal end side portion of the second bending wire fixing piece 4e by brazing, for example.

  The position where the first wire guide members 8U and 8D are fixed and the position where the second wire cut portion 32 is provided are moved with respect to the longitudinal axis direction so as to be separated from each other by a predetermined interval with respect to the longitudinal direction. Is set to the correct position.

  As shown in FIG. 5, the first wire guide member 8U is fixed on the left and right rotation shaft 2 on the upper inner peripheral surface of the second bending wire fixing piece 4e. On the other hand, the first wire guide member 8D is fixed to the lower inner peripheral surface of the second bending wire fixing piece 4e and moved to the left side by an angle θ1 with respect to the left / right rotation shaft 2.

  On the other hand, the second wire cut portion 32 provided on the upper side surface of the second bending wire fixing piece 4e is provided at a position moved to the right side by an angle θ2 with respect to the left / right rotation shaft 2. . On the other hand, the second wire bending portion 32 provided on the lower surface of the second bending wire fixing piece 4e is provided at a position moved to the left side by an angle θ3 with respect to the left and right rotation shaft 2.

  In addition, the code | symbol 3 of FIG. 5 is an up-down rotation axis | shaft. In FIG. 5, the angle θ4 and the angle θ2 are different, and in the present embodiment, the angle θ4 is set larger than the angle θ2.

  Further, reference numerals 9a and 9b shown in FIGS. 6 and 7 are connecting protrusions. A through-hole 9c in which the rivet 6a is disposed is formed in the connecting projection 9a, and a through-hole 9d in which the pin 6b is disposed is formed in the connecting projection 9b. This is because when the two bending pieces are pivotably coupled, the coupling projection 9a is disposed on the inner surface side, and the coupling projection 9b is disposed on the outer surface side. And the structure of the connection projection part provided in each piece 4a, 4b, 4c, 4d, 4f is the same as that of this connection projection part 9a, 9b.

  Also, as shown in FIG. 2, the up / down / left / right bending piece 4c and the up / down bending piece 4d disposed between the first bending portion second piece 4b and the second bending wire fixing piece 4e also have the bending pieces 4c, 4d. A pair of first wire guide members 8U and 8D through which the first bending wires 5U and 5D are inserted, or a pair of first wire guide members through which the first bending wires 5L and 5R are inserted at predetermined positions on the inner peripheral surface. 8L and 8R are fixed integrally by brazing, for example. The fixed positions of the first wire guide members 8U and 8D and the first wire guide members 8L and 8R are set as shown in FIG.

  Specifically, as shown in FIGS. 2 and 8, the fixing position of the first wire guide member 8 </ b> U is the upper inner peripheral surface of the up / down / left / right bending piece 4 c and the up / down bending piece 4 d and the left / right rotation shaft 2. Above. On the other hand, the fixed position of the first wire guide member 8D is the lower inner peripheral surface of the up / down / left / right bending piece 4c and the up / down bending piece 4d and moves to the left side by an angle θ1 with respect to the left / right rotation shaft 2. Is set to the specified position. The fixing position of the first wire guide member 8L is set to the left inner peripheral surface of the up / down / left / right bending piece 4c and moved to the upper side by an angle θ5 with respect to the up / down rotation shaft 3. Yes. On the other hand, the fixing position of the first wire guide member 8R is set to the right inner peripheral surface of the up / down / left / right bending piece 4c and moved to the upper side by an angle θ6 with respect to the up / down rotation shaft 3. Yes.

  In the present embodiment, the upper / lower left / right curved piece 4c, which is one type, is provided with a pair of connecting projections 9a and 9b for connecting the adjacent pieces on the front end side so as to be rotatable in the vertical direction. First wire guide members 8L and 8R are provided. And the 1st wire guide members 8U and 8D are provided in the up-down and left-right bending piece 4c and the up-down bending piece 4d in the other type. In FIG. 8, the angle θ5 and the angle θ6 are set to different values, and θ6 is larger than θ5 in this figure.

  On the other hand, as shown in FIGS. 2 to 4 and FIGS. 9 to 14, the up / down / left / right bending pieces 4c disposed between the second bending wire fixing piece 4e and the first bending portion proximal piece 4f, and In the upper and lower bending pieces 4d, a pair of first wire guide members 8U and 8D through which the first bending wires 5U and 5D are inserted at predetermined positions on the inner peripheral surfaces of the bending pieces 4c and 4d, and the pair of first wire guide members. In addition to 8U and 8D, a pair of first wire guide members 8L and 8R through which the first bending wires 5L and 5R are inserted, in addition to the pair of first wire guide members 8L and 8R, second bending wires 7U and 7D are provided. A pair of second wire guide members 10U and 10D to be inserted is provided.

  As shown in FIG. 3 and FIG. 4 and FIG. 9 to FIG. 11, a pair of connecting projections 9a and 9b for connecting the adjacent pieces on the tip side so as to be rotatable in the vertical direction is one type. In addition to the pair of first wire guide members 8L and 8R through which the first bending wires 5L and 5R are inserted, the second bending wires 7U and 7D are inserted into the inner peripheral surface of the provided upper / lower / left / right bending piece 4c. A pair of second wire guide members 10U and 10D are integrally fixed by brazing, for example.

  As shown in FIGS. 3, 4, and 9, the fixing position of the second wire guide member 10 </ b> U is the upper side surface of the up / down / left / right bending piece 4 c and the up / down bending piece 4 d and is angled with respect to the left / right rotation shaft 2. It is set at a position moved to the right side by θ2. On the other hand, the fixing position of the wire guide member 10D is the lower side of the up / down / left / right bending piece 4c and the up / down bending piece 4d, and is moved to the left side by an angle θ3 with respect to the left / right rotation shaft 2. Set to position.

  On the other hand, the fixing position of the first wire guide member 8L is the same as the one type of vertical and horizontal bending pieces 4c arranged between the first bending portion second piece 4b and the second bending wire fixing piece 4e. The position is set to the left inner peripheral surface and moved to the upper side surface by an angle θ5 with respect to the vertical rotation shaft 3. On the other hand, the fixing position of the first wire guide member 8R is the right inner peripheral surface and the upper surface side by the angle θ6 with respect to the vertical rotation shaft 3 as in the case of the one type of vertical and horizontal bending pieces 4c. Is set to the moved position.

  10 and 11, the fixed position of the pair of first wire guide members 8L and 8R in the longitudinal axis direction is the base end side portion of the up / down / left / right bending piece 4c, and a pair of second wire guides. The fixed position of the members 10U and 10D with respect to the longitudinal axis direction is the tip side of the up / down / left / right bending piece 4c.

  The other type of up / down / left / right bending piece 4c is similar to the other type of up / down / left / right bending piece 4c disposed between the first bending portion second piece 4b and the second bending wire fixing piece 4e. A first wire guide member 8U and a first wire guide member 8D are provided. Specifically, the first wire guide member 8U is the proximal end portion on the left and right pivot shaft 2 of the upper inner peripheral surface, and the first wire guide member 8D is the lower inner peripheral surface and is rotated left and right. This is a base end side portion at a position moved to the left side by an angle θ1 with respect to the moving shaft 2.

  As shown in FIG. 3, FIG. 4, FIG. 12 and FIG. 13, in addition to the first wire guide members 8U and 8D through which the first bending wires 5U and 5D are inserted, A pair of second wire guide members 10U and 10D through which the two bending wires 7U and 7D are inserted are integrally fixed by brazing, for example.

  As shown in FIGS. 3, 4, and 12, the fixing position of the second wire guide member 10 </ b> U is the upper side surface of the vertical bending piece 4 d and moves to the right side by an angle θ <b> 2 with respect to the left and right rotation shaft 2. Is set to the specified position. On the other hand, the fixing position of the wire guide member 10D is set to the lower side surface of the vertical bending piece 4d and moved to the left side surface by the angle θ3 with respect to the left and right rotation shaft 2.

  On the other hand, the fixed position of the first wire guide member 8U is the upper inner peripheral surface of the vertical bending piece 4d and on the left and right rotation shaft 2. On the other hand, the fixed position of the first wire guide member 8D is the lower inner peripheral surface of the up and down bending piece 4d, and is the position moved to the left side by an angle θ1 with respect to the left and right rotation shaft 2. Is set.

  Furthermore, in the configuration in which the first wire guide members 8U and 8D and the second wire guide members 10U and 10D are arranged as shown in FIGS. 4 and 13, the fixed positions of the first wire guide members 8U and 8D are set up and down. While the base end side portion in the longitudinal axis direction of 4d is set, the fixing position of the second wire guide members 10U and 10D is set to the distal end side portion in the longitudinal axis direction of the vertical bending piece 4d. As a result, the second wire guide members 10U and 10D and the first wire guide members 8U and 8D have a positional relationship that is displaced with respect to the longitudinal axis direction.

  That is, in the present embodiment, the first wire guide member 8U and the second wire guide member 10U are disposed adjacent to each other in the up and down bending piece 4d, and the first wire guide member 8D and the second wire guide. The member 10D is prevented from being disposed at a position adjacent to the member 10D.

  Thus, by shifting the positions of the first wire guide member 8U and the second wire guide member 10U, and the first wire guide member 8D and the second wire guide member 10D, each piece has a large diameter. A state in which the first wire guide member 8U and the second wire guide member 10U are arranged close to each other in the circumferential direction without forming them, and the first wire guide member 8D and the second wire guide member 10D in the circumferential direction. The insertion path of the first bending wire 5U is blocked by the second wire guide member 10U, the insertion path of the first bending wire 5D is blocked by the wire guide member 10D, The insertion path of the second bending wire 7U is blocked by the first wire guide member 8U, and the second bay is blocked by the first wire guide member 8D. And it prevents the insertion path of the wire 7D is prevented.

  Therefore, the first wire guide members 8U, 8D fixed to the bending pieces 4c, 4d disposed between the second bending wire fixing piece 4e of the first bending portion 24 and the first bending portion proximal end piece 4f, The fixed positions of the second wire guide members 10U and 10D and the first wire guide members 8L and 8R are in a positional relationship as shown in FIG.

  That is, as shown in FIG. 14, the first wire guide member 8U is on the left and right rotation shaft 2 on the upper inner peripheral surface, and the first wire guide member 8D is the lower inner peripheral surface and on the left and right rotation shaft 2. In contrast, the second wire guide member 10U is moved to the left side by an angle θ1, and the second wire guide member 10U is an upper inner peripheral surface and moved to the right side by an angle θ2 with respect to the left and right pivot shaft 2. The wire guide member 10D is a lower inner peripheral surface and is moved to the left side by an angle θ3 with respect to the left and right pivot shaft 2, and the first wire guide member 8L is the left inner peripheral surface. The first wire guide member 8R is the right inner peripheral surface and the upper side surface by the angle θ6 with respect to the vertical rotation shaft 3. It is the position moved to the side.

Next, the configuration of the lid portion 26 will be described with reference to FIGS. 2 to 4 and FIGS. 15 to 21.
As shown in FIGS. 2, 15, 16, and 17, the hook portion 26 includes a ring member 33 in addition to the first bending portion base end piece 4 f and the second bending portion tip piece 5 a. Yes. In the state where the first bending portion proximal end piece 4f, the second bending portion distal end piece 5a, and the ring member 33 are arranged in this order from the outer peripheral surface side, the jumper portion 26 is provided with a first bending portion proximal end piece by a screw 34 that is a fastening member. 4f, the second bending portion tip piece 5a, and the ring member 33 are integrally fixed.

  As shown in FIG. 18, the ring member 33 arranged on the innermost circumferential surface side is provided with a through-hole 33a into which a later-described endoscope built-in object is inserted and arranged. The through-hole 33a has a plurality of curved surface portions and a plurality of flat surface portions and is formed in a predetermined shape. For example, the ring member 33 is provided with flat portions on the left and right inner surfaces, the left diagonally upper inner surface, and the right diagonally lower inner surface in the drawing, so that the ring member 33 is formed thick to ensure strength. The left diagonal upper portion 33b and the right diagonal lower portion 33c, where the strength is secured, are provided with female screw portions 33d into which the screws 34 are screwed.

  The formation position of the female screw portion 33d is set to a position moved counterclockwise by, for example, an angle of 45 degrees with respect to the vertical axis in the drawing.

  As shown in FIGS. 18 and 19, the distal end portion of the first wire insertion coil 35 </ b> U through which the first bending wire 5 </ b> U is inserted and the first bending wire 5 </ b> D are inserted at predetermined positions on the inner peripheral surface of the ring member 33. The distal end of the first wire insertion coil 35D, the distal end of the first wire insertion coil 35L through which the first bending wire 5L is inserted, and the distal end of the first wire insertion coil 35R through which the first bending wire 5R is inserted, For example, it is fixed integrally by brazing. The width dimension of the ring member 33 is set to a predetermined dimension in consideration of the attachment strength of the first wire insertion coils 35U, 35D, 35L, and 35R to the ring member 33.

  That is, the portion where the female screw portion 33d is formed and the portion to which the first wire insertion coils 35U, 35D, 35L, and 35R are attached are formed to be thick, and the other portions are formed to be as thin as possible while maintaining strength. ing.

  Here, the distal end fixing position of the first wire insertion coil 35U is the position of the upper inner peripheral surface of the ring member 33 and moved to the left side by an angle θ7 with respect to the vertical axis. On the other hand, the distal end fixing position of the first wire insertion coil 35D is the position of the lower inner peripheral surface that is moved to the right side by an angle θ8 with respect to the vertical axis.

  Further, the distal end fixing position of the first wire insertion coil 35L is a position on the left inner surface and moved to the upper surface side by an angle θ5 with respect to the horizontal axis in the drawing. On the other hand, the distal end fixing position of the first wire insertion coil 35R is a position on the flat surface of the right inner surface and moved to the upper surface by an angle θ6 with respect to the horizontal axis.

  The second bending portion tip piece 5 a constituting the lid portion 26 is one of the pieces constituting the second bending portion 25. As shown in FIG. 20, the second bending portion tip piece 5a is formed by processing a tubular member into a predetermined shape, and is a connection for connecting pieces adjacent to the base end side so as to be rotatable in the vertical direction. A pair of projections 9a are provided in a positional relationship facing each other. And the center of the through-hole 9c formed in the connection projection part 9a provided in the right side surface of the 2nd bending part front piece 5a, and the center of the through-hole 9c formed in the connection projection part 9a provided in the left side surface The straight line that connects to the vertical axis corresponds to the vertical rotation axis.

  As shown in FIGS. 20 and 21, the second bending portion distal piece 5a has a stepped shape, and includes a large diameter portion 41 constituting the distal end side and a small diameter portion 42 constituting the proximal end side, and a large diameter portion. A circumferential convex portion 43 is provided at the boundary between 41 and the small diameter portion 42. On the outer peripheral surface side of the large-diameter portion 41, the first bending portion base end piece 4f is disposed. The leading end side rising surface of the circumferential convex portion 43 is a positioning portion with which the base end surface of the first bending portion base end piece 4f abuts. Therefore, the outer diameter of the large-diameter portion 41 is set in consideration of the outer diameter size of the first bending portion base end piece 4f, and the formation position of the circumferential convex portion 43 is the length of the first bending portion base end piece 4f. It is set in consideration of the dimensions and arrangement position.

  Further, the inner hole of the second bending portion distal piece 5a has a stepped shape, and has a large diameter hole 41a provided on the distal end side and a small diameter hole 42a provided on the proximal end side. A ring member 33 is disposed in the large diameter hole 41a. And the base end surface of the ring member 33 is contact | abutted and arrange | positioned at the step part 41b which is a boundary part of the large diameter hole 41a and the small diameter hole 42a. Therefore, the inner diameter of the large diameter hole 41 a is set in consideration of the outer diameter dimension of the ring member 33, and the depth dimension of the large diameter hole 41 a is set in consideration of the width dimension of the ring member 33.

  A through-hole through which the screw 34 corresponding to the female screw portion 33d provided in the ring member 33 disposed in the large-diameter hole 41a is inserted in a predetermined position of the large-diameter portion 41 having the large-diameter hole 41a. 44 is provided.

  On the other hand, the left and right inner surfaces of the small-diameter hole 42a are provided with flat portions formed in substantially the same shape as the flat portions provided on the left and right inner surfaces of the ring member 33. By providing a flat portion in the small diameter hole 42a of the second bending portion distal piece 5a, the area of the step portion 41b with which the base end surface of the ring member 33 abuts is partially increased. Accordingly, a stable arrangement state can be obtained in a state where the ring member 33 is arranged in the large diameter hole 41a.

As shown in FIGS. 15 and 16, the outer diameter of the ring member 33 and the inner diameter of the portion of the second bending portion tip piece 5a that fits with the ring member 33 are set to be approximately the same size. As shown in FIG. 15, the second wire guide member 10U is integrally fixed to the upper inner peripheral surface of the small diameter hole 42a, for example, by brazing, and the wire guide member 10D is integrated to the lower inner peripheral surface, for example, by brazing. Fixed. As shown in FIG. 17, the fixing position of the second wire guide member 10U is a position moved to the right side by an angle θ9 with respect to the vertical axis, and the fixing position of the wire guide member 10D is relative to the vertical axis. And moved to the left side by an angle θ10. The length dimension of the small diameter hole 42a is set in consideration of the fixing strength of the second wire guide members 10U and 10D.
In addition, the code | symbol 41c is an parameter | index for notifying the vertical direction upper part of the 2nd bending part front piece 5a, and is comprised by the through-hole.

  As shown in FIGS. 15 and 17, the first bending portion base end piece 4 f that is externally fitted to the large diameter portion 41 of the second bending portion distal piece 5 a has an outer shape in addition to the configuration described above. A counterbore 45 in which the head of the screw 34 is arranged is provided on the proximal end side where the fitting is arranged, and an indicator 46 for notifying the upper part in the vertical direction of the first bending portion proximal end piece 4f in the same manner as the indicator 41c. Is provided. This index 46 is also formed of a through hole.

  In the above-described jumper portion 26, the first wire insertion coils 35 </ b> U, 35 </ b> D, 35 </ b> L, 35 </ b> R are provided without providing the second wire cut portion 32 for arranging the distal ends of the second bending wires 7 </ b> U, 7 </ b> D. It is the structure which fixes only a front-end | tip part. Therefore, as shown in FIG. 2, the base of the second bending portion distal piece 5a is formed from the vertical rotation shaft of the connecting projection 9b provided at the distal end side portion of the first bending portion proximal end piece 4f constituting the bush portion 26. The length L1 of the connecting projection 9a provided on the end side to the up-and-down rotation axis and the connection provided on the tip side of the two up-down and left-right bending pieces 4c connected by the left-right rotation axis. The first bending portion base piece 4f is set so that the length L2 from the vertical rotation axis of the projection 9b to the vertical rotation axis of the connecting projection 9a provided on the base side is the same. The dimensions of each part of the ring member 33 and the second bending portion tip piece 5a are set.

Next, the configuration of the second bending portion 25 will be described with reference to FIG.
The aforementioned second bending portion tip piece 5 a is disposed at the tip of the second bending portion 25. On the other hand, the second bending portion base end piece 5 d is arranged at the base end of the second bending portion 25. Between the second bending portion distal end piece 5a and the second bending portion proximal end piece 5d, the up / down / left / right bending piece 5b having the same configuration as the up / down / left / right bending piece 4c constituting the first bending portion 24, and the first bending portion An up / down bending piece 5c having the same configuration as the up / down bending piece 4d constituting 24 is appropriately arranged. As a result, the length dimension of the second bending portion 25 is set to a desired dimension, and a desired smooth curved shape is obtained.

  In addition, as for the up / down / left / right bending piece 5b, the tubular member is processed in the same manner as the up / down / left / right bending piece 4c, so that two types are formed in substantially the same shape. In addition, as described above, a pair of connecting projections for connecting the adjacent pieces on the distal end side so as to be rotatable in the left-right direction are provided in a positional relationship facing each other, as described above. The second wire guide members 10U and 10D are disposed at predetermined positions on the inner peripheral surface of a type in which a pair of connecting projections for connecting the adjacent pieces to each other so as to be pivotable in the vertical direction are provided in an opposed positional relationship. For example, it is fixed integrally by brazing.

  Similarly to the vertical bending piece 4d, the vertical bending piece 5c is formed in substantially the same shape by processing a tubular member. The second wire guide members 10U and 10D are integrally fixed to a predetermined position on the inner peripheral surface of the vertical bending piece 5c, for example, by brazing.

  The second bending portion base end piece 5d is formed by processing a tubular member into a predetermined shape, and a pair of connecting projections 9b for connecting pieces adjacent to the distal end side so as to be rotatable in the vertical direction, It is provided in a positional relationship facing each other. A straight line connecting the center of the through hole 9d of the connecting projection 9b provided on the right side and the center of the through hole 9d of the connecting projection 9b provided on the left side corresponds to the vertical rotation axis. The proximal end side portion of the second bending portion proximal end piece 5d is integrally fixed to a connecting member 47 disposed on the distal end side of the flexible tube portion 23.

  At a predetermined position on the inner peripheral surface of the connecting member 47, there are a distal end portion of the second wire insertion coil 48U through which the second bending wire 7U is inserted and a distal end portion of the second wire insertion coil 48D through which the second bending wire 7D is inserted. For example, it is fixed integrally by brazing.

In the present embodiment, for example, the second bending portion 25 may be configured using the up / down / left / right bending pieces 4c and the up / down bending pieces 4d constituting the first bending portion 24.
As a result, the connecting projection 9a provided on the base end side of the second bending portion distal piece 5a constituting the jumper portion 26 has two vertical and horizontal bending pieces 5b connected to each other by a left and right rotation shaft. Instead, a connecting projection 9b provided at the tip side of the two up / down / left / right bending pieces 4c connected by the left / right rotation shaft is arranged. Then, the connection projection 9a provided on the base end side from the vertical rotation axis of the connection projection 9b provided on the distal end side of the two up / down / left / right bending pieces 4c connected by the left / right rotation shaft. The length dimension to the vertical rotation axis is the same as the length dimension L1 and the length dimension L2, and a smoother curved shape is configured.

  Moreover, as shown in FIG. 17, the endoscope built-in object is inserted and arranged in the bending portion. Reference numeral 51 denotes a signal cable. An image pickup device (not shown) built in the distal end portion 21 and a camera control unit (not shown) which is an external device are electrically connected by a signal cable. Reference numeral 52 denotes a light guide bundle. For example, two light guide bundles are provided. The light guide bundle 52 is for transmitting illumination light of an illumination lamp provided in a light source device (not shown). Reference numeral 53 denotes a treatment instrument insertion channel tube also serving as a suction tube. Reference numeral 54 denotes a water supply tube. The water supply tube 54 is a tube for supplying, for example, water ejected from a nozzle (not shown) provided at the distal end portion 21. Reference numeral 55 denotes a probe provided with an insertion shape detection coil for displaying the insertion shape of the endoscope insertion portion.

  In the bending portion 22 of the endoscope 1 of the present embodiment, the distal end portions of the second bending wires 7U and 7D are fixed to a second bending wire fixing piece 4e that is one of the pieces constituting the first bending portion 24. ing. For this reason, in the seal part 26 comprised by the 1st bending part base end piece 4f, the ring member 33, and the 2nd bending part front piece 5a, it is the 1st for arrange | positioning the front-end | tip part of 2nd bending wire 7U and 7D. Only the tip of the first wire insertion coils 35U, 35D, 35L, and 35R is fixed without providing the two-wire bending portion 32, and the length dimension of the jumper portion 26 is used in a conventional endoscope. It is shorter than the length dimension of the formed jumper member 130.

  Therefore, as shown in FIG. 22, the upper and lower left and right bending pieces 4 c connected to the proximal end side of the first bending portion 24 disposed before and after the jumping portion 26, and the second bending portion, as shown in FIG. The portion formed by the two up / down / left / right bending pieces 5b connected to the distal end side of the 25 has a smooth curved shape as compared with the first bending portion 110 of the bending portion 100 of the conventional endoscope indicated by a dotted line. Bend. As a result, the insertion property of the bending portion 22 constituting the insertion portion 11 can be improved.

  Moreover, the 1st bending part 24 and the 2nd bending part 25 which the bending part 22 has are comprised by coat | covering the curve covering rubber comprised by the fixed diameter dimension. For this reason, when only the second bending portion 25 is bent in the order of the bending A1 step → the bending B1 step → the bending C1 step → the bending D1 step so that the bending angle gradually increases, the second bending portion 25 is shown in FIG. It will bend as shown by.

  That is, in the bending A1 stage that is the initial stage of bending, the base end side that is the flexible tube part 23 side of the second bending part 25 is slightly bent. Subsequently, in the bending B1 stage, the second bending portion 25 is bent from the proximal end portion to the midway portion. Next, in the bending C1 stage, the second bending portion 25 is bent from the proximal end portion to the distal end side portion. In the maximum bending state, which is the stage of bending D1, the second bending portion 25 to the distal end side portion are further bent.

  On the other hand, when only the first bending up / down knob 14a is operated without bending the second bending up / down knob 15a, the first bending position 26 is located on the front end side as shown by the one-dot chain line in FIG. The bending portion 24 is bent. Then, for example, when the first bending up / down knob 14a is operated in the bending D1 stage or the like, that is, in the state where the second bending portion 25 is bent to the maximum, as shown by the dotted line in FIG. The 1st bending part 24 which comprises the front end side rather than the 2 bending wire fixing piece 4e is curved.

The operation of the insertion portion 11 of the endoscope 1 configured as described above will be described with reference to FIGS.
When inserting the distal end portion 21 of the insertion portion 11 of the endoscope 1 from the anus 61 through the rectum 62 into the bent sigmoid colon 63, the surgeon appropriately performs the bending operation of the first bending up / down knob 14a and pushes and pulls it. A delicate hand operation such as twisting or twisting is performed to bring the distal end portion 21 into the vicinity of the sigmoid colon 63 with the first bending portion 24 being bent as shown in FIG.

  In this introduced state, the position of the second bending wire fixing piece 4e provided on the first bending portion 24, where the distal ends of the second bending wires 7U and 7D are fixed, faces the sigmoid colon 63. Become position. On the other hand, the lid portion 26 provided in the curved portion 22 is located in the rectum 62.

  Next, in order to introduce the distal end portion 21 into a deeper portion of the sigmoid colon 63, the surgeon performs a delicate hand operation and also performs a bending operation on the second bending up / down knob 15a. At this time, the distal end portion of the second bending operation wire 121 is fixed to the hook member 130 that connects the first bending portion 110 and the second bending portion 120 constituting the bending portion 100 in the conventional structure of the endoscope. In the structure described above, the second bending portion 120 is bent so that the proximal end side portion of the first bending portion 110 or the vicinity of the collar member 130 abuts against the wall of the rectum 62. Then, the second bending portion 120 is bent in the rectum 62 as shown by a two-dot chain line, and further progress of the insertion portion 11 is prevented.

  On the other hand, in the present embodiment, the distal ends of the second bending wires 7U and 7D are fixed to the second bending wire fixing piece 4e constituting the first bending portion 24. Therefore, when the second bending up / down knob 15a is operated to bend, as shown by the one-dot chain line in FIG. 25, the proximal end of the second bending wire fixing piece 4e to which the distal ends of the second bending wires 7U and 7D are fixed is provided. The base end side portion of the first bending portion 24 constituting the side and the second bending portion 25 are curved. This is because the second bending wire fixing piece 4e is arranged at a position facing the sigmoid colon, and in addition to the second bending portion 25, the proximal end side of the first bending portion 24 connected by the hook portion 26. This is because the first to second bending wire fixing pieces 4e are bent.

  Then, the distal end portion 21 is introduced into the deep portion of the sigmoid colon 63 as the proximal end side portion of the first bending portion 24 and the second bending portion 25 are bent. Here, the insertion part 11 is introduced toward the deep part. Then, as shown in FIG. 26, the vicinity of the joint portion 26 connecting the first bending portion 24 and the second bending portion 25 forms a smooth curved shape, and thus the vicinity of the joint portion 26 smooths the bent portion. Pass through. Then, the surgeon appropriately operates the first curved up / down knob 14a in addition to the second curved up / down knob 15a so that the distal end portion 21 faces the target direction as shown in FIG. Perform hand operations such as twisting and twisting. Thus, the insertion portion 11 is smoothly introduced toward the deep portion while forming a loop corresponding to the bent shape.

  As described above, in the configuration in which the first bending portion and the second bending portion are provided in the bending portion provided in the insertion portion of the endoscope, and the second bending portion and the first bending portion are connected by the jumper portion. The tip of the first wire insertion coil through which the first bending wire for bending the first bending portion is inserted is fixed integrally to the ring member constituting the hook portion, while the second bending portion is operated to bend. For example, by fixing the distal end portion of the second bending wire to one of the pieces constituting the first bending portion, the second wire cutting portion for fixing the distal end portion of the second bending wire from the hook portion is unnecessary, The length dimension of the jumper portion can be shortened.

  As a result, the vicinity of the jumper portion is curved into a smooth curved shape, so that the insertion property of the curved portion having a configuration in which the first curved portion and the second curved portion are connected by the jumper portion is improved.

  Further, the jumper portion is composed of a first bending portion proximal piece constituting the first bending portion, a second bending portion distal piece constituting the second bending portion, and a ring member, and these first bending portion proximal ends. The piece, the second bending portion distal piece, and the ring member are arranged in the order of the first bending portion proximal piece, the second bending portion distal piece, and the ring member from the outer peripheral surface side, and are integrally fixed by screws that are fastening members. As a result, the fixing strength of the connecting portion can be improved, and workability when connecting the first bending portion and the second bending portion can be improved.

  Further, a positioning portion is provided on the outer peripheral surface of the second bending portion distal piece constituting the jumper portion, and the proximal end surface of the ring member is provided in the inner hole of the second bending portion distal piece. By providing the stepped portion that comes into contact, the first bending portion proximal end piece, the second bending portion distal end piece, and the ring member can be easily assembled. Thereby, the workability when connecting the first bending portion and the second bending portion can be further improved.

  Instead of the curved rubber 28, as shown in FIG. 28, a stepped curved rubber 28A provided with a small diameter portion 28a and a large diameter portion 28b formed thicker than the small diameter portion 28 is covered. The bending portion 22A may be configured.

  Specifically, as shown in the figure, in the bending portion 22A of the endoscope 1, a bending rubber 28A having a small diameter portion 28a and a large diameter portion 28b is disposed on the outermost exterior. The large-diameter portion 28b is disposed between the vicinity of the center portion of the second bending portion 25 constituting the bending portion 22 and the proximal end side portion. Thus, the second curved portion 25 includes a portion where the small diameter portion 28a is disposed and a portion where the large diameter portion 28b is disposed. That is, in the second bending portion 25, the bending property of the portion from the vicinity of the central portion where the large diameter portion 28b is arranged to the proximal end side portion of the second bending portion 25 and the vicinity of the central portion where the small diameter portion 28a is arranged. When the bendability of the portion up to the distal end side portion of the second bending portion 25 is compared, the portion from the vicinity of the central portion to the base end portion is difficult to bend. That is, the bending state of the second bending portion 25 changes in two stages.

  Accordingly, when only the second bending up / down knob 15a is bent without operating the first bending up / down knob 14a, in other words, only the bending angle of the second bending portion 25 is bent without bending the first bending portion 24. When gradually increasing in the order of A stage → bending B stage → curving C stage → bending D stage, the second bending portion 25 is bent as shown by a solid line in FIG.

  That is, in the bending A stage, which is the initial stage of bending, a portion from the center portion of the second bending portion 25 covered with the small diameter portion 28a to the tip side portion is bent. Subsequently, in the bending B stage, the portion of the second bending portion 25 that is covered with the small diameter portion 28a is further bent. Next, in the bending C stage, the portion of the second bending portion 25 that is covered with the small-diameter portion 28a is further curved, and the base portion starts from the middle portion of the second bending portion 25 where the large-diameter portion 28b is disposed. The part up to the end side is also slightly curved. In the maximum bending state, which is the stage of bending D, the portion of the second bending portion 25 that is covered with the small-diameter portion 28a is further bent, and the large-diameter portion 28b of the second bending portion 25 is disposed. The part where it is further curved.

  On the other hand, as described above, in the bending portion 22 including the first bending portion 24 and the second bending portion 25 in which the outermost case is configured by the bending rubber 28, only the second bending portion 25 is gradually increased in bending angle. In this way, when bending is performed in the order of the bending A1 stage → the bending B1 stage → the bending C1 stage → the bending D1 stage, the second bending portion 25 is bent as shown by a one-dot chain line in the drawing.

  As described above, the narrow rubber portion 28a and the large diameter portion 28b are provided on the curved rubber 28A covering the second curved portion 25 constituting the curved portion 22A, and the large diameter portion 28b is provided near the center of the second curved portion 25. By arranging the portion from the center portion to the distal end side portion in the second bending portion 25 so as to be easily bent, in other words, the second bending portion 25 from the center portion to the proximal end side. By restricting the bending performance to the portion, the second bending portion 25 can be bent more reliably from the distal end side. As a result, the insertability can be further improved.

  In the bending portion 22A of the configuration of the present embodiment, since the distal ends of the second bending wires 7U and 7D are fixed to the second bending wire fixing piece 4e, the first bending up / down knob 14a is not bent. When only the second bending up / down knob 15a is operated to bend, in addition to the second bending portion 25, the bending from the proximal end side of the first bending portion 24 connected by the hook portion 26 to the second bending wire fixing piece 4e is bent. Is done.

  On the other hand, when only the first bending up / down knob 14a is operated without bending the second bending up / down knob 15a, the first bending located on the front end side from the collar portion 26 as shown by a one-dot chain line in the figure. The part 24 is curved. For example, when the first bending up / down knob 14a is operated in the bending D stage or the like, that is, in the state where the second bending portion 25 is bent to the maximum, as shown by the dotted line in FIG. The 1st bending part 24 which comprises the front end side rather than the 2 bending wire fixing piece 4e is curved.

  Further, as shown in FIGS. 30 to 35 below, a bending portion may be configured to bend the second bending portion 25 from the distal end side.

In the bending portion 22B shown in FIG. 30, the bending rubber 28 is arranged from the vicinity of the central portion of the second bending portion 25 to the proximal end portion, and the bending rubber 28 is disposed over the entire length of the first bending portion 24 and the second bending portion 25. It is arranged over.
Accordingly, the bending state of the second bending portion 25 is configured to change in two steps similarly to the above-described bending portion 22A, and can be bent from the distal end side.

In the bending portion 22C shown in FIG. 31, the bending rubber 28 is disposed in a range from the proximal end portion of the second bending portion 25 to, for example, 1/3, and the bending rubber 28 is further extended from the proximal end portion to, for example, 2/3. After being disposed in the range, the curved rubber 28 is further disposed over the entire length of the first curved portion 24 and the second curved portion 25.
Thereby, the bending state of the second bending portion 25 can be changed in three stages, and the second bending portion 25 can be bent more reliably from the distal end side.

  In the bending portion 22D shown in FIG. 32, the bending rubber 28A is disposed in a range from the proximal end portion of the second bending portion 25 to, for example, 2/3, while the bending rubber 28 is disposed in the first bending portion 24 and the second bending portion. It is arranged over the entire length of 25. The narrow diameter portion 28a of the curved rubber 28A is in the range from the proximal end portion of the second curved portion 25 to 1/3, and the narrow diameter portion 28b of the curved rubber 28A is 1 / second from the proximal end portion of the second curved portion 25. By providing so as to cover the range from 3 to 2/3, the bending performance of the second bending portion 25 is changed in three stages like the bending portion 22C, and the second bending portion 25 is more reliably attached to the distal end side. Can be curved from.

In the bending portion 22E shown in FIG. 33, instead of covering the bending rubber 28A in the range from the vicinity of the center portion of the second bending portion 25 of the mesh tube 27 constituting the bending portion 22E to the base end side portion, the elastic adhesive 56 is used. Is applied over the entire circumference, and the bending rubber 28 is disposed over the entire length of the first bending portion 24 and the second bending portion 25.
As a result, the second bending portion 25 is configured to change in two steps in substantially the same manner as the bending portion 22A, and can be bent from the distal end side.

  Instead of applying the elastic adhesive to the range from the vicinity of the central portion of the second bending portion 25 of the mesh tube 27 to the base end side portion, for example, urethane resin is thermally welded, and then the bending rubber 28 is attached to the first By arranging the entire length of the bending portion 24 and the second bending portion 25, the base side of the second bending portion may be regulated to obtain the same action and effect.

  In the bending portion 22F shown in FIG. 34, the elastic adhesive 56 is applied to a range of, for example, 1/3 from the base end side portion of the second bending portion 25 of the mesh tube 27 constituting the bending portion 22E, while the bending rubber 28 is applied. Is disposed in a range from the base end to 2/3, for example, and then the curved rubber 28 is disposed over the entire length of the first curved portion 24 and the second curved portion 25.

  As a result, the bending state of the second bending portion 25 can be changed in three stages similarly to the bending portion 22C, and the second bending portion 25 can be bent more reliably from the distal end side.

  In the bending portion 22G shown in FIG. 35, instead of applying the elastic adhesive 56 in the range from the base end side portion of the second bending portion 25 of the mesh tube 27 constituting the bending portion 22E to, for example, 1/3, a bobbin winder While providing the bonding portion 57, the curved rubber 28 is disposed in a range from the base end portion to, for example, 2/3, and then the curved rubber 28 is disposed over the entire length of the first curved portion 24 and the second curved portion 25. Yes.

  As a result, the bending performance of the second bending portion 25 can be changed in three stages similarly to the bending portion 22F, and the second bending portion 25 can be bent more reliably from the distal end side.

  In addition, this invention is not limited only to embodiment mentioned above, A various deformation | transformation implementation is possible in the range which does not deviate from the summary of this invention.

The figure explaining the endoscope which equips an insertion part with the bending part comprised by having a 1st bending part and a 2nd bending part. Longitudinal sectional view for explaining the configuration of the bending portion The figure explaining the structure of the 1st bending part of a base end side from the 2nd bending wire fixing piece. AA line sectional view of FIG. The figure which shows the 2nd bending wire fixing piece seen from the arrow B direction of FIG. GG sectional view of FIG. HH line sectional view of FIG. The figure explaining the 2nd bending wire fixed piece seen from the arrow C direction of FIG. The figure explaining the up-down-left-right bending piece seen from the arrow D direction of FIG. FIG. 9 is a cross-sectional view taken along the line II of FIG. KK sectional view of FIG. The figure explaining the vertical bending piece seen from the arrow E direction of FIG. 12 is an explanatory cross-sectional view in which the distal end side portion of the MM sectional view of FIG. 12 and the proximal end portion of the NN sectional view are synthesized. The figure explaining the arrangement positional relationship of the wire guide member arrange | positioned at the 1st bending part seen from the arrow F direction of FIG. Enlarged view illustrating the configuration near the hook portion provided in the bending portion FIG. 15 is a diagram for explaining a configuration in the vicinity of a hook portion provided in a bending portion viewed from the direction of arrow P in FIG. Q-Q sectional view of FIG. Front view when the ring member constituting the collar part is viewed from the tip side RR line sectional view of FIG. The figure explaining the structure of the 2nd bending part tip piece SS sectional view of FIG. The figure explaining the bending state of the bending part which connected the 1st bending part and the 2nd bending part with the hook part. The figure explaining the bending state of the bending part by which curve covering rubber | gum is arrange | positioned The figure explaining the state which curved the 1st bending part and has arrange | positioned the front-end | tip part in the sigmoid colon. The figure explaining the state which bent the 2nd bending part in the state which curved the 1st bending part and has arrange | positioned the front-end | tip part in the sigmoid colon. The figure which shows the state which made the insertion part into the deep part by making the curved part vicinity which connects the 1st bending part and the 2nd bending part into a smooth curve shape. The figure explaining the state which operated the 1st curve up-down knob in addition to the 2nd curve up-down knob, and turned the front-end | tip part to the target direction. Longitudinal cross-sectional view for explaining the configuration of the curved portion where the stepped curved covering rubber is arranged The figure explaining the bending state of the bending part by which the stepped curve covering rubber | gum is arrange | positioned The figure explaining the structural example of the bending part which has arrange | positioned the some curve covering rubber | gum. The figure explaining the structural example of the bending part which has arrange | positioned the some curve covering rubber | gum. The figure explaining the structural example of the bending part which has arrange | positioned curved covering rubber and stepped curved covering rubber The figure explaining the structural example of the curved part which has arrange | positioned curved covering rubber to the net tube which apply | coated the elastic adhesive agent in part The figure explaining the structural example of the curved part which has arrange | positioned several curved covering rubber to the net tube which apply | coated the elastic adhesive agent in part The figure explaining the structural example of the curved part which has arrange | positioned the some curved covering rubber to the net tube which provided the pincushion adhesion part in part The figure explaining the structure of the connection part of a 1st bending part and a 2nd bending part. The figure explaining the bending state of the bending part which has a 1st bending part and a 2nd bending part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Endoscope 4e ... 2nd bending wire fixing piece 5a ... 2nd bending part front piece 5U ... 1st bending wire for upper direction 5D ... 1st bending wire for downward direction 5L ... 1st bending wire for left direction 5R ... 1st bending wire for right direction 7U ... 2nd bending wire for upward direction 7D ... 2nd bending wire for downward direction 8U ... 1st wire guide member for upward direction 8D ... 1st wire guide member for downward direction 8L ... for left direction 1st wire guide member 8R ... 1st wire guide member for right direction 10U ... 2nd wire guide member for upward direction 10D ... 2nd wire guide member for downward direction 11 ... Insertion part 22 ... Bending part 24 ... 1st bending part 25 ... Second bending part
26 ... Splash part 33 ... Ring member 34 ... Screw 35U ... First wire insertion coil for upper direction 35D ... First wire insertion coil for lower direction 35L ... First wire insertion coil for left direction 35R ... First wire insertion for right direction Coil 48U: Upward second wire insertion coil 48D: Downward second wire insertion coil

Claims (3)

A first bending portion provided on the distal end side of the elongated insertion portion and configured to bend at least in a vertical direction by connecting a plurality of bending pieces, and connected to a proximal end side of the first bending portion via a hook portion. A second bending portion which is configured to be connected to a plurality of bending pieces so as to be bent at least in the vertical direction; a first bending portion bending operation wire for bending the first bending portion; A second bending portion bending operation wire for bending the bending portion, a first wire insertion coil through which the first bending portion bending operation wire is inserted, and the second bending portion bending operation wire are inserted. An endoscope comprising a second wire insertion coil,
In the configuration in which the tip portion of the first wire insertion coil is fixed to the jumper portion,
An endoscope, wherein a distal end portion of the second bending portion bending operation wire is fixed to a bending piece constituting the first bending portion or the second bending portion. A first bending portion proximal piece constituting the proximal end of the first bending portion; a second bending portion distal piece constituting the distal end of the second bending portion; and the first wire insertion coil. In the configuration comprising a ring member to which the tip is fixed,
The second bending portion distal piece is disposed on the inner surface side of the first bending portion proximal piece, and the ring member is disposed on the inner surface side of the second bending portion distal piece, The endoscope according to claim 1, wherein the second bending portion tip piece and the ring member are integrally fixed by a fastening member. The second bending portion distal piece includes a step portion in which the proximal end surface of the ring member is disposed in contact with the inner hole, and a positioning portion on which the proximal end surface of the first curved portion proximal end piece is disposed on the outer peripheral surface side. The endoscope according to claim 2, wherein the endoscope is characterized.

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