JP2005230333A - Instrument for endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an instrument for an endoscope which is small and excellent in operability while making a part for treatment replaceable. <P>SOLUTION: The instrument 3 has an instrument insertion part 21 inserted through the endoscope, and a tip cover 26 is fixed to the tip of the insertion part 21. A slit 31 is formed at the tip cover 26, and a bearing hole 32 is formed at the terminal end of the slit 31. A treatment unit 27 mounted to the tip cover 26 has a pair of gripping members 34a and 34b supported by a main shaft 33 in a rotatable manner. The main shaft 33 has a role of engaging with the bearing hole 32 to mount the treatment unit 27 to the tip cover 26. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an endoscope treatment tool used by being inserted into a forceps channel of an endoscope.

  An endoscopic apparatus tool used by being inserted into an endoscope has a flexible treatment instrument insertion portion that is inserted into a forceps channel of the endoscope, and a treatment portion is provided at the distal end of the treatment instrument insertion portion. Is provided. An example of the treatment portion is a treatment portion in which a pair of gripping members are supported on the tip cover so as to be freely opened and closed. In this case, an operation wire for rotating a pair of gripping members is connected to the treatment portion, and the operation wire passes through the treatment tool insertion portion and is connected to the treatment tool operation portion provided at the proximal end of the treatment tool insertion portion. It is connected. That is, when an endoscope operator or the like operates the treatment tool operation unit, the treatment unit connected to the treatment tool operation unit via the operation wire operates.

Here, there is a conventional endoscope treatment tool in which a treatment part is configured to be detachable from a treatment tool insertion part so that the treatment part can be used by being exchanged (see, for example, Patent Document 1). Specifically, the treatment instrument insertion portion has a flexible coil sheath, and a coupler is provided at the tip of the coil sheath. On the other hand, in the treatment portion, a coupler that engages with the coupler on the treatment instrument insertion portion side is attached to the proximal end portion of the distal end cover via a coil sheath. The operation wire is configured to be freely engaged and disengaged by a ball-shaped plug and a socket.
US Pat. No. 5,782,748

By the way, since the endoscope treatment tool is inserted into the forceps channel of the endoscope that is inserted into the body, it is desirable that the endoscope treatment tool be small, light, and easy to operate. The endoscope treatment tool has a problem that the treatment portion is enlarged by the length of the coupler. In particular, if a coil sheath exists between the coupler and the tip cover, there arises a problem that the operation becomes complicated. Along with this, there is a problem that the treatment tool becomes expensive.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a small-sized and easy-to-operate endoscopic treatment tool while making it possible to replace a portion related to treatment. It is.

The invention according to claim 1 of the present invention for solving the above-described problems is that a treatment instrument insertion portion is inserted into a forceps channel of an endoscope, and an operation wire passing through the treatment instrument insertion portion is operated to operate the forceps of the treatment unit. A treatment instrument for an endoscope that operates a portion, wherein the treatment unit includes a pair of forceps portions and a rotation shaft that rotatably supports the forceps portions, and the treatment tool insertion portion includes: A treatment instrument for an endoscope, comprising a connecting member that attaches and detaches the treatment unit by engaging and disengaging the rotation shaft at a distal end of a flexible sheath.
In this endoscope treatment instrument, the treatment section is formed of a connection member fixed to the distal end of the treatment instrument insertion section and a treatment unit that is detachable from the connection member. The rotation shaft of the treatment unit also functions as means for engaging and holding the treatment unit with the connection member in addition to the function as the rotation center of the pair of forceps portions.

According to a second aspect of the present invention, in the endoscope treatment instrument according to the first aspect, the treatment unit includes a link for transmitting the operation of the operation wire to the forceps portion.
This endoscope treatment tool has a link for assisting in opening / closing operation of the forceps portion, and can easily open and close the forceps portion of the treatment unit detachably attached to the connecting member.

The invention according to claim 3 is characterized in that, in the endoscope treatment tool according to claim 1 or 2, the treatment unit and the operation wire are detachable.
In this endoscope treatment tool, a treatment unit and an operation wire for opening and closing a forceps portion are configured to be detachable. For this reason, since a treatment unit can be made independent from an operation wire, a treatment part can be reduced in size and weight.

According to a fourth aspect of the present invention, in the endoscope treatment tool according to any one of the first to third aspects, the connection member has a slit that can engage the rotation shaft, The slit is formed in parallel with an insertion direction through which the connection member is inserted into the forceps channel.
In this endoscope treatment tool, the slit is provided in parallel to the insertion direction to the forceps channel. That is, since the slit is provided along the length direction of the treatment instrument insertion portion, the treatment unit can be attached from the distal end side of the connection member, and the treatment unit can be easily attached and detached.

The invention according to claim 5 is the treatment instrument for endoscope according to any one of claims 1 to 4, wherein the connection member has a slit that can engage with the rotation shaft. The slit is formed so as to be substantially orthogonal to an insertion direction in which the connection member is inserted into the forceps channel.
In this endoscope treatment tool, the slit is provided in a direction substantially orthogonal to the insertion direction of the forceps channel. For this reason, the treatment unit can be attached in the direction in which the operation wire advances and retreats and the direction in which the treatment instrument is inserted and withdrawn, and the treatment unit is firmly attached.

The invention according to claim 6 includes a treatment instrument insertion portion that is inserted into a forceps channel of an endoscope, and a treatment unit that has a pair of forceps portions that are arranged to face each other, and the pair of forceps portions are themselves A treatment instrument for an endoscope having a distal end portion that is separated by elasticity, and opening and closing the forceps portion by operating an operation wire passing through the treatment instrument insertion portion, wherein the treatment unit includes both ends of a shaft member Is fixed to the inner surface of the ring member, and each of the pair of forceps portions is inserted into each of two regions partitioned by the shaft member and the ring-shaped member, and the treatment instrument insertion portion is flexible A connecting member for fixing the ring member at the distal end of the conductive sheath, and the opening of the pair of forceps portions is controlled when the operation wire is operated by fixing the ring member to the connecting member. Endoscope featuring It was 置具.
In this endoscope treatment tool, the treatment unit has its own elasticity and a forceps portion that is opened and closed by a ring member and a shaft member. The shaft member also functions as means for engaging and holding the treatment unit with the connecting member, in addition to the function as means for regulating the opening of the forceps portion.

  According to the present invention, the treatment unit is configured to be detachable with respect to the connection member fixed to the distal end of the treatment instrument insertion portion, and the forceps portion is opened and closed on the rotating shaft or the shaft member that is a component of the treatment unit. In addition to the function of making the connection member, the connecting member has a function as means for engaging the treatment unit, so that the configuration of the treatment unit can be simplified, and the size and weight can be reduced. For this reason, when such an endoscopic treatment tool is used, a procedure can be easily performed. Moreover, the cost can be reduced by making the treatment unit replaceable.

The best mode for carrying out the invention will be described in detail with reference to the drawings.
FIG. 1 shows a schematic configuration of an endoscope system including an endoscope treatment tool according to the first embodiment.
As shown in FIG. 1, an endoscope system includes an endoscope 1, an endoscope treatment tool (hereinafter referred to as a treatment tool) 3 inserted into a forceps channel 2 of the endoscope 1, an endoscope, An endoscope main body (not shown) connected to the mirror 1 by a universal cord 4 is provided.

Here, the endoscope 1 includes a flexible insertion portion 6 to be inserted into a living body, an operation portion 7 connected to the proximal end (external) side of the insertion portion 6, and a universal cord 4. Yes.
A bendable bending portion 8 is provided at the distal end of the insertion portion 6. Further, a distal end cover 9 is connected to the distal end of the bending portion 8, and an imaging unit for observing the inside of the body and an irradiation unit for irradiating illumination light are incorporated therein. An opening of the forceps channel 2 is formed on the distal end surface of the distal end cover 9. Here, the forceps channel 2 has a forceps port 2a on the operation unit 7 side, and allows communication between the outside of the body and the inside of the body. A forceps plug 10 is attached to the forceps port 2a so as to cover the forceps port 2a.

The operation unit 7 includes a plurality of switches 11 and a plurality of operation knobs 12 in addition to the insertion port 2a. Examples of the switch 11 include a switch for recording an image photographed by the imaging unit and a switch for switching illumination. The signal of each switch 11 is sent to the endoscope body via the universal cord 4. The operation knob 12 includes a knob that changes the bending portion 8 in a predetermined direction.
Note that the endoscope main body is provided with a device for processing and displaying an image captured by the endoscope 1, an illumination light source for imaging, and the like.

  As shown in FIGS. 2 to 4, the treatment instrument 3 includes a flexible treatment instrument insertion portion 21 to be inserted into the forceps channel 2 of the endoscope 1 and a treatment provided at the distal end of the treatment instrument insertion portion 21. And a treatment instrument operating section 24 provided at the proximal end of the treatment instrument insertion section 21. The operation wire 23 is configured to open and close the treatment section 22 (see FIG. 3).

The treatment instrument insertion portion 21 has a coiled sheath 25, and a distal end cover 26 (connecting member) of the treatment portion 22 is fixed to the distal end of the sheath 25.
The treatment section 22 includes a distal end cover 26 and a treatment unit 27 that can be attached to and detached from the distal end cover 26.
The tip cover 26 has a substantially cylindrical base 28. In the center of the base portion 28, a hole (not shown) through which the operation wire 23 is inserted so as to freely advance and retract is provided. As shown in FIG. 4, two support portions 29 a are extended from the base portion 28 in parallel to the length direction of the tip cover 26. For this reason, the tip cover 26 is substantially U-shaped in a plan view shown in FIG. A part of the curved surface connected to the base portion 28 is cut off from the outer surface of the distal end portion 30 of the support portion 29 to be a flat surface. As shown in FIGS. 2 and 3, a slit 31 is provided in each of the tip portions 30.

  The slit 31 is formed on the center line of the support portion 29 by a predetermined length from the tip. A bearing hole 32 is formed at the end of the slit 31. The bearing hole 32 has a diameter larger than the width of the slit 31 and penetrates the outer surface and the inner surface of the tip portion 30 of the support portion 29. The two slits 31 are provided at positions that are 180 ° out of phase with respect to the central axis of the tip cover 29, and the two bearing holes 32 corresponding to the terminal portions of the slits 31 are provided coaxially. . The tip cover 26 configured in this way is elastically deformable to such an extent that the width of the opening end side of the slit 31 can be expanded to the same extent as the bearing hole 32.

As shown in FIGS. 3 and 4, the treatment unit 27 attached to and detached from the distal end cover 26 includes a pair of grip members 34 a and 34 b that are pivotally supported by the main shaft 33, and link members that are connected to the grip members 34 a and 34 b. 35a and 36b, and the joint part 36 connected to the operation wire 23 are comprised.
The grasping member 34a includes a grasping main body portion 37a and an arm portion 38a extending from the grasping main body portion 37a toward the rear (the treatment instrument insertion portion 21 side in FIGS. 3 and 4). Similarly, the gripping member 34b includes a gripping main body portion 37b and an arm portion 38b. As shown in FIG. 2, each of the gripping main body portions 37 a and 37 b has an elongated shape, and a plurality of toothed teeth 39 are arranged along the length direction. Further, claw portions 40a and 40b are formed at the tips of the grip body portions 37a and 37b. As shown in FIG. 3, the gripping members 34a and 34b are opposed to each other so as to mesh the toothed teeth 39 and the claw portions 40a and 40b, and are supported by the main shaft 33 at the arm portions 38a and 38b.
The arm portion 38a is pivotally supported by the main shaft 33 from one end portion fixed to the grip main body portion 37a to the other end portion. One end of the link member 35a is rotatably connected to the other end of the arm 38a by a connecting pin 41a. Similarly, the arm portion 38b is pivotally supported by the main shaft 33 from one end portion fixed to the grip main body portion 37b to the other end portion, and one end portion of the link member 35b is connected to the connecting pin 41b at the other end portion. Are pivotally connected to each other.

The main shaft 33 serves as a rotation shaft when the gripping main body portions 37a and 37b of the pair of gripping members 34a and 34b are brought close to or separated from each other, and each arm portion 38a and 38b is moved in the length direction thereof. It penetrates in the orthogonal direction. The diameter of the main shaft 33 is substantially equal to the diameter of the bearing hole 32 on the tip cover 26 side.
Each link member 35a, 35b extends rearward from one end side connected to each arm portion 38a, 38b, and the other end portions are rotatably connected by a connecting pin 43 so as to sandwich the rod 42 therebetween. ing. The end of the rod 42 is a spherical joint 36. The main shaft 33, the arm portions 38a and 38b, the connecting pins 41a and 41b, the link members 35a and 35b, the connecting pin 43, and the rod 42 constitute a link mechanism of the treatment unit 27.
In the treatment unit 27 configured as described above, the length of the main shaft 33, that is, the size of the treatment unit 27 in the width direction is such that the main shaft 33 extends from one end of each arm portion 38a, 38b to the joint portion 36. Except for this, it is smaller than the distance between the two support portions 29 on the tip cover 26 side.

Here, the joint portion 36 of the treatment unit 27 can be connected to a socket 44 provided at the distal end of the operation wire 23. The socket 44 has a fitting hole 45 that is a substantially spherical recess capable of accommodating the joint portion 36 therein. Further, an insertion slit 46 into which the joint portion 36 and the rod 42 are inserted is provided between the fitting hole 45 and the tip end surface of the socket 44. The width of the insertion slit 46 is approximately the same as the diameter of the rod 42 and is smaller than the diameter of the joint portion 36. The socket 44 can be elastically deformed to such an extent that the joint portion 36 can be inserted through the insertion slit 46. A taper 47 is provided at the peripheral edge of the opening of the insertion slit 46 formed on the distal end surface so that the joint portion 36 can be easily inserted.
The operation wire 23 has a tip provided with a socket 44 drawn out to the tip cover 26 side, and the other end is inserted into the treatment tool insertion portion 21 so as to be able to advance and retreat, and is drawn out to the treatment tool operation portion 24 side shown in FIG. The slider 48 is fixed to the treatment instrument operation unit 24.

The treatment instrument operation unit 24 includes an operation unit main body 49 and a slider 48 that is slidable with respect to the operation unit main body 49.
The proximal end of the treatment instrument insertion portion 21 is connected to the distal end of the operation portion main body 49, and a finger ring 50 is provided at the proximal end of the operation portion main body 49. A slide groove 51 is formed on the finger ring 50 side of the operation unit body 49 along the length direction of the operation unit body 49. A slider 48 is slidably fitted in the slide groove 51.

Next, the effect | action of this treatment tool 3 is demonstrated.
First, the treatment unit 27 is attached to the distal end cover 26. As shown in FIGS. 3 and 4, the distal end of the operation wire 23 is pulled out from between the support portions 29 of the distal end cover 26, and the joint portion 36 of the treatment unit 27 is fitted into the socket 44.
When the operation wire 23 is engaged with the treatment unit 27, the treatment unit 27 is attached to the distal end cover 26. The ends of the gripping members 34 a and 34 b from the arm portions 38 a and 38 b are inserted between the support portions 29, and the main shaft 33 is inserted into the slit 31 provided at the tip of the support portion 29. Since the peripheral edge portion of the slit 31 is manufactured from a member that can be elastically deformed, the opening end of the slit 31 is widened so as to be pushed and spread on the main shaft 33. When the treatment unit 27 is pushed into the distal end cover 26 as it is, the main shaft 33 reaches the bearing hole 32 and the opening end side of the slit 31 is restored to the original shape. Thereby, the main shaft 33 and the bearing hole 32 are engaged, and the treatment unit 27 is attached to the distal end cover 26.

  When the treatment unit 27 is attached, the treatment tool 3 is inserted into the forceps channel 2 of the endoscope 1. When opening and closing the pair of gripping members 34a and 34b, the thumb is passed through the finger ring 50 of the treatment instrument insertion portion 24, the slider 48 is sandwiched between the index finger and the middle finger, and the slider 48 is advanced to the front end side. When the slider 48 advances, the operation wire 23 fixed to the slider 48 advances in the operation portion main body 49, the treatment instrument insertion portion 21, and the distal end cover 26, and as a result, is connected by the socket 44 and the joint portion 36. The rod 42 of the treatment unit 27 is pushed out to the distal end side. The movement of the rod 42 is transmitted to the arm portions 38 a and 38 b of the gripping members 34 a and 34 b via the link members 35 a and 35 b connected by the connecting pin 43. Here, the arm portions 38a and 38b are rotatably supported by the main shaft 33. Since the main shaft 33 is engaged with the support portion 29 of the tip cover 26, the gripping members 34a and 34b themselves move forward. I can't. Therefore, when the rod 42 is advanced, the arm portions 38a and 38b connected via the link members 35a and 35b rotate about the main shaft 33, and the other end portions of the arm portions 38a and 38b are connected to each other. Separate. As a result, the grip body portions 37a and 37b are separated from each other, and the pair of grip members 34a and 34b are opened.

  Further, when closing the pair of gripping members 34a and 34b, the slider 48 is retracted. The operation wire 23 retreats in the operation unit main body 49, the treatment instrument insertion unit 21, and the distal end cover 26. As a result, the rod 42 of the treatment unit 27 is pulled back. When the rod 42 moves backward, the arm portions 38a and 38b connected via the link members 35a and 35b rotate around the main shaft 33, and the other end portions of the arm portions 38a and 38b come close to each other. The pair of gripping members 34a and 34b are closed. The peripheral portion of the slit 31 of the tip cover 26 is detached from the bearing hole 32 when the operating wire 23 is advanced or when a living tissue is grasped and pulled by the pair of grasping members 34a and 34b. Rigidity that does not separate.

  When the treatment unit 27 is removed, the treatment unit 27 is pulled out along the length direction of the distal end cover 26 after the slider 48 is in a free state. At this time, the main shaft 33 is detached from the bearing hole 32, passes through the opening end of the slit 31, and comes out of the support portion 29. As a result, the engagement between the treatment unit 27 and the distal end cover 26 is released, and the treatment unit 27 is removed when the engagement between the joint portion 36 and the socket 44 is subsequently released. Note that when the treatment unit 27 is remounted or when another type of treatment unit is attached or detached, the above-described mounting operation is repeated.

In this embodiment, the treatment unit 27 and the distal end cover 26 are configured to be detachable, and the treatment unit 27 and the distal end cover 26 are engaged and disengaged by the rotation shafts (main shaft 33) of the pair of gripping members 34a and 34b. I did it. That is, since the main shaft 33 has a function as a rotating shaft of the pair of gripping members 34a and 34b and a function as an attaching / detaching means to the tip cover 26, the treatment unit 27 can be attached and detached with a simple configuration. Can do. Therefore, the treatment tool 3 can be reduced in size and weight, and the procedure can be easily performed. Further, when a plurality of treatment units having different structures and functions are prepared, the tip cover 26 to the treatment instrument operation unit 24 can be shared, and the manufacturing cost and running cost can be reduced.
In addition, since the operation wire 23 and the link mechanism are configured to be detachable, the treatment unit 27 can be easily attached and detached.
Furthermore, since the treatment unit 27 is attached / detached along the length direction of the distal end cover 26, it is easy to apply a force when attaching / detaching.
Since the treatment unit 27 is configured to open and close the pair of gripping members 34a and 34b by a link mechanism, the amount of operation of the slider 48 during opening and closing can be reduced.

Next, a second embodiment of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same component as said 1st embodiment. Moreover, the description which overlaps with 1st embodiment is abbreviate | omitted.
As shown in FIG. 5, the treatment instrument 60 of this embodiment has a treatment section 61 at the distal end of the treatment instrument insertion section 21. The treatment portion 61 is formed by a distal end cover 62 fixed to the treatment instrument insertion portion 21 and a treatment unit 27 that is detachable in a direction substantially perpendicular to the length direction of the distal end cover 62.

The tip cover 62 has a substantially cylindrical base 63. The base 63 is provided with a hole (not shown) through which the operation wire 23 can be inserted and retracted. Further, as shown in FIG. 6, two support portions 64 are extended from the base portion 63 in parallel with the length direction. As shown in FIG. 5, a slit 66 is provided at each distal end portion 65 of each support portion 64. The two slits 66 are formed in parallel in a direction orthogonal to the length direction of the tip cover 62, and the opening ends thereof are formed at the upper edge portion of the tip portion 65. Further, a bearing hole 32 is formed at the end of each slit 66. The diameter of the bearing hole 32 is larger than the width on the open end side of the slit 66 and is substantially equal to the diameter of the main shaft 33 of the treatment unit 27.
The treatment unit 27 attached to the distal end cover 62 has the same configuration as that of the first embodiment.

  As shown in FIG. 6, the socket 67 provided at the tip of the operation wire 23 has a fitting hole 45 in which the joint portion 36 can be engaged, and the fitting hole 45 faces the upper surface of the socket 67. An insertion slit 68 is formed. The insertion slit 68 is for inserting the joint portion 36 from above, and its width is smaller than the diameter of the fitting hole 45. Further, the insertion slit 68 is formed with a taper 69 whose upper surface side is widened so that the joint portion 36 can be easily inserted. Further, an insertion slit 70 is formed from the fitting hole 45 to the front surface of the socket 67. The width and depth of the insertion slit 70 are sufficient to insert the rod 42.

In the treatment instrument 60 configured as described above, when the treatment unit 27 is mounted, the position of the socket 67 is first adjusted. That is, with the position of the bearing hole 32 as a reference, the position of the socket 67 is advanced and retracted according to the distance from the main shaft 33 of the treatment unit 27 to the joint portion 36.
After adjusting the position of the socket 67, the treatment unit 27 is inserted above the distal end cover 62, that is, from the opening end side of the insertion slits 68 and 70 and the slit 66 of the socket 67 and the support portion 64. The joint portion 36 penetrates into the fitting hole 45 while widening the insertion slit 68 and engages with the fitting hole 45. At this time, the rod 42 is accommodated in the insertion slit 68. Further, the main shaft 33 reaches the bearing hole 32 and engages with the bearing hole 32 while widening the slit 66. As a result, the treatment unit 27 is attached to the distal end cover 62 and the treatment portion 61 is formed.

When the operation wire 23 is advanced and retracted with the treatment unit 27 attached, the arm portions 38a and 38b rotate about the main shaft 33, and the pair of gripping members 34a and 34b open and close.
When removing the treatment unit 27, the treatment unit 27 is pulled up above the distal end cover 62 with the slider 48 free. The engagement between the main shaft 33 and the bearing hole 32 is released, the main shaft 33 comes out of the support portion 64, the engagement between the joint portion 36 and the socket 67 is released, and the treatment unit 27 is removed.

  According to this embodiment, the treatment unit 27 and the distal end cover 62 are configured to be detachable, and the treatment unit 27 is engaged with the distal end cover 62 by the main shaft 33, so that the first embodiment is described above. The same effect can be obtained. Here, in the second embodiment, since the treatment unit 27 is attached and detached in a direction substantially orthogonal to the direction in which the operation wire 23 is advanced and retracted, the engagement strength between the main shaft 33 and the bearing hole 32 can be increased. it can.

Next, a third embodiment of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same component as each said embodiment. Further, the description overlapping with each of the embodiments is omitted.
As shown in FIG. 7, the treatment unit 81 in this embodiment has a configuration that does not have a link mechanism. In the treatment instrument 82, a distal end cover 83 is fixed to the distal end of the treatment instrument operation unit 21, and the treatment unit 81 and the distal end cover 83 form a treatment section 84. In addition, a treatment instrument operation section 24 (see FIG. 1) is provided at the proximal end of the treatment instrument insertion section 21.

The treatment unit 81 is disposed between a pair of gripping members 85a and 85b that are disposed to face each other, a ring-shaped restriction member 86 in which the gripping members 85a and 85b are inserted, and a pair of gripping members 85a and 85b. The main shaft 87, the rod 89 fixed to the base ends of the gripping members 85a and 85b via a fixing member 88, and the joint portion 36 are configured.
The gripping members 85a and 85b have an elongated shape and are curved from the proximal end portion to the distal end portion. The two gripping members 85a and 85b are fixed to the fixing member 88 so that the warping directions of the tip portions are opposite to each other, that is, the tip portions are separated from each other in a natural state. And the front-end | tip of each holding member 85a, 85b is bent so that it may mutually adjoin, and it is the nail | claw part 90a, 90b. The claw portions 90a and 90b are provided to prevent the living tissue or the like grasped by the pair of grasping members 85a and 85b from dropping off. The grip members 85a and 85b have elasticity depending on the material or shape thereof. For this reason, it can deform | transform so that each nail | claw part 90a, 90b may adjoin by applying external force.

Each base end of the pair of gripping members 85 a and 85 b is fixed to a fixing member 88. A rod 89 extends rearward from the fixing member 88. A joint portion 36 is attached to the end portion of the rod 89.
Further, the main shaft 87 is fixed to a plate 91 extending from the inner peripheral portion of the regulating member 86 toward the rear (fixed member 88 side). As shown in FIG. 8, the main shaft 87 is disposed at a position that divides the opening 92 of the restricting member 86 into two equal parts. A gripping member 85a and a gripping member 85b are inserted through each of the equally divided portions of the opening 92. Note that the length of the main shaft 87 is larger than the outer diameter of the regulating member 86.

  The distal end cover 83 to which the treatment unit 81 is attached has a substantially cylindrical shape. A slit 93 having a predetermined length is formed along the length direction of the tip cover 83 from the edge of the opening at the tip of the tip cover 83. Two slits 93 are provided at positions that are 180 degrees out of phase with respect to the central axis of the tip cover 83, and bearing holes 94 are formed at the respective end portions thereof. The bearing hole 94 is a through-hole penetrating from the outer peripheral surface of the tip cover 83 to the inner peripheral surface, and its axis is arranged in a direction perpendicular to the central axis of the tip cover 83. The diameter of the bearing hole 94 is larger than the width on the opening end side of the slit 93 and is substantially equal to the diameter of the main shaft 87. The tip cover 83 can be elastically deformed so that at least the periphery of the slit 93 can be inserted through the joint portion 36 when the joint portion 36 is pushed in.

The operation of the treatment instrument 82 configured as described above will be described.
When the treatment unit 81 is attached to the distal end cover 83, the joint portion 36 is attached to the socket 44 provided at the distal end of the operation wire 23, and both are engaged. Further, the main shaft 87 is inserted from the opening end side of the slit 93, and the main shaft 87 and the bearing hole 94 are engaged while elastically deforming the tip cover 83. At this time, as shown in FIG. 9, the regulating member 86 and the tip of the tip cover 83 come into contact with each other, and the treatment unit 81 is attached to the tip cover 83.

  When closing the pair of gripping members 85a, the slider 48 of the treatment instrument operation unit 24 shown in FIG. 1 is moved backward to the finger ring 50 side. Thereby, the operation wire 23 is retracted, and the rod 89 and the fixing member 88 engaged with the socket 44 and the joint portion 36 are pulled back to the treatment instrument insertion portion 24 side. The gripping members 85 a and 85 b whose base ends are fixed to the fixing member 88 are retracted into the regulating member 86 and the distal end cover 83 while their outer surfaces are in contact with the regulating member 86. At this time, the tip portions of the gripping members 85 a and 85 b are deformed toward the central axis of the tip cover 83 so as to be pressed by the regulating member 86. The pair of gripping members 85a and 85b move together, and as shown in FIG. 10, the claw portions 90a and 90b are close to each other, and the pair of elastic members 85a and 85b are closed.

When opening the pair of gripping members 85a and 85b, the slider 48 of the treatment instrument operation unit 24 is moved forward. As a result, the operation wire 23 advances, and the fixing member 88 connected thereto advances the pair of gripping members 85 a and 85 b relative to the regulating member 86 and the tip cover 83. As a result of the forward movement, the portion of the pair of gripping members 85a and 85b that contacts the regulating member 86 slides to the base end side. As a result, the distal ends of the pair of gripping members 85a and 85b open by their own elasticity. Note that the pair of grasping forceps 85 a and 85 b can be opened until their proximal ends abut against the main shaft 87.
Here, the tip cover 83 has such a rigidity that the engagement between the bearing hole 94 and the main shaft 87 is maintained when the operation wire 23 is advanced. In addition, when removing the treatment unit 81 from the distal end cover 83, an operation reverse to that at the time of mounting is performed.

  According to this embodiment, the treatment unit 81 having a pair of gripping members 85a and 85b that open and close by elasticity without having a link mechanism is configured to be detachable from the distal end cover 83. It can be simplified and the manufacturing cost can be reduced. In particular, the main shaft 87 has a function of regulating the opening degree of the pair of gripping members 85a and 85b and a function of attaching / detaching the treatment unit 81 and the distal end cover 83, so that the configuration of the treatment portion 84 is simplified. Thus, the size and weight can be reduced.

The present invention can be widely applied without being limited to the above-described embodiments.
For example, the operation wire 23 may be fixed to the treatment units 27 and 81 without providing the sockets 44 and 67 at the tip of the operation wire 23. In this case, when attaching the treatment units 27 and 81, the operation wire 23 is inserted from the distal end cover 26 and 83 side, inserted into the treatment instrument insertion portion 21, and then drawn out to the treatment instrument operation portion 24 side. The slider 48 is fixed. And after arrange | positioning the operation wire 23, the main shafts 33 and 87 and the bearing holes 32 and 94 are fitted.
The treatment units 22, 61, and 84 may have other configurations as long as the forceps have a portion that opens and closes. Further, a high-frequency knife or the like that does not have an opening / closing mechanism may be configured as a detachable treatment tool. For example, in the case of a high-frequency knife, main shafts 33 and 87 that engage with the bearing holes 32 and 94 are provided in the knife portion, and a joint portion 36 that is electrically connected to a conductive operation wire is provided. As described above, when a plurality of types of treatment units are configured to be replaceable, the procedure can be performed quickly, and the running cost of the apparatus can be reduced.
A distal end cover 62 as shown in FIG. 6 may be applied to the treatment instrument 82 of the third embodiment, and the treatment unit 81 may be configured to be attached and detached from a direction substantially perpendicular to the advancing / retreating direction of the operation wire 23. .
The engagement strength with the main shafts 33 and 87 may be increased by providing irregularities on the inner week surfaces of the bearing holes 32 and 94. Further, the tip cover 62 of the second embodiment may be provided with a slit having a width substantially equal to the diameter of the main shaft 33 without providing the large-diameter bearing hole 32. Furthermore, without providing the bearing holes 32 and 94, it is also possible to provide irregularities at the end of the slit having a substantially constant width and engage the main shafts 33 and 87 here.

It is a figure which shows the state which made the endoscope treatment tool in embodiment of this invention penetrate the endoscope. It is a figure which shows the structure of the treatment tool for endoscopes, Comprising: It is a figure which shows the state which the holding member opened. It is a partially expanded side view which shows the state which removed the treatment unit. It is a partially expanded plan view which shows the state which removed the treatment unit. It is a partially expanded side view which shows the state which removed the treatment unit. It is a partially expanded plan view which shows the state which removed the treatment unit. It is a partially expanded side view which shows the state which removed the treatment unit. It is A arrow directional view of FIG. It is a partial enlarged side view of the treatment tool for endoscope, and is a view showing a state in which a pair of gripping members are opened. It is a partial enlarged side view of the treatment tool for endoscope, and is a view showing a state in which a pair of gripping members are closed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Endoscope 2 Forceps channel 3, 60, 82 Treatment tool (endoscopic treatment tool)
21 treatment instrument insertion part 23 operation wire 25 sheath 26, 62, 83 tip cover (connection member)
27, 81 Treatment unit 31, 66, 93 Slit 33 Main shaft (rotating shaft)
34a, 34b, 85a, 85b Grip member (forceps)
35a, 35b link member (link)
44, 67 Socket 86 Restriction member (ring member)
87 Main shaft (shaft member)

Claims (6)

A treatment instrument for an endoscope in which a treatment instrument insertion portion is inserted into a forceps channel of an endoscope, and an operation wire passing through the treatment instrument insertion portion is operated to operate a forceps portion of a treatment unit.
The treatment unit includes a pair of forceps portions and a rotation shaft that rotatably supports the forceps portions,
The treatment instrument insertion portion includes a connection member that attaches and detaches the treatment unit by engaging and disengaging the rotation shaft at a distal end of a flexible sheath.   The endoscopic treatment tool according to claim 1, wherein the treatment unit includes a link that transmits the operation of the operation wire to the forceps portion.   The endoscopic treatment instrument according to claim 1 or 2, wherein the treatment unit and the operation wire are detachable.   2. The connection member according to claim 1, wherein the connection member has a slit that can engage with the rotation shaft, and the slit is formed in parallel with an insertion direction for inserting the connection member into the forceps channel. The treatment tool for endoscopes as described in any one of Claim 3 to Claim 3.   The connection member has a slit capable of engaging the rotation shaft, and the slit is formed so as to be substantially orthogonal to an insertion direction for inserting the connection member into the forceps channel. The treatment tool for endoscopes as described in any one of Claims 1-4. A treatment instrument insertion portion inserted into a forceps channel of an endoscope, and a treatment unit having a pair of forceps portions arranged to face each other, and the pair of forceps portions have distal ends separated by their own elasticity. An endoscopic treatment tool that opens and closes the forceps part by operating an operation wire passing through the treatment tool insertion part,
In the treatment unit, both ends of the shaft member are fixed to the inner surface of the ring member, and each of the pair of forceps portions is inserted into each of two regions defined by the shaft member and the ring-shaped member,
The treatment instrument insertion portion includes a connection member that fixes the ring member to a distal end of a flexible sheath,
A treatment instrument for an endoscope, wherein the opening of the pair of forceps is controlled when the operation wire is operated by fixing the ring member to the connection member.

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