JP5683614B2 - Ultrasound endoscope - Google Patents

Description

  The present invention relates to an ultrasonic endoscope, and more particularly to an ultrasonic endoscope provided with a treatment instrument stand that erects a treatment instrument derived from a treatment instrument lead-out portion at a distal end portion of an insertion portion.

  2. Description of the Related Art Conventionally, in an ultrasonic endoscope, an upright is provided at the distal end of an insertion portion that is inserted into a body cavity, and a treatment instrument that is inserted through a treatment instrument insertion channel and is led out from a treatment instrument deriving portion at the distal end is A device that can be raised and that can change the standing angle of the stand and adjust the direction in which the treatment tool is led out is known (for example, see Patent Document 1).

  According to the endoscope of Patent Document 1, an upright base is provided in the treatment instrument outlet, and an upright lever is connected to the upright base via a rotating shaft. An operation wire is connected to the upright lever, and the operation wire is pushed and pulled by an operation of an operation unit provided continuously with a proximal end portion of the insertion unit.

  Therefore, when the operation wire is pushed and pulled by the operation of the operation unit, the upright lever is rotated, and when the upright lever is rotated, the upright is rotated through the rotation shaft to perform the upright operation.

JP 2005-287593 A

  In recent years, treatments using ultrasonic endoscopes are increasing, and the use of high-frequency treatment tools as treatment tools is also increasing.

  On the other hand, in an ultrasonic endoscope provided with a stand as in Patent Document 1, a metal material (stainless steel) that has high strength and is easy to manufacture as a stand and a drive component disposed at the tip. Etc.) are often used.

  Also, in an ultrasonic endoscope, the driving voltage of the ultrasonic transducer disposed at the distal end becomes high, so the distal end body that accommodates and holds the components of the distal end is formed of an insulating material such as plastic. It is desirable to sufficiently insulate the ultrasonic transducer and the wiring extending from the ultrasonic transducer.

  In such an ultrasonic endoscope, when a high-frequency treatment tool is used, a high-frequency leakage current may leak from the high-frequency treatment tool to the stand. At this time, the leakage current leaked to the stand does not flow to the insulating tip body that accommodates and holds the stand and its driving components.

  Therefore, the stand is connected to the ground (GND) of the operation unit of the endoscope through a conductive operation wire connected to the drive component of the stand, and the leakage current leaked to the stand is grounded through the drive component and the operation wire. It is possible to escape.

  However, since the operation wire is thin, the conduction resistance is high, and current hardly flows. Therefore, even if the operation wire is electrically connected to the ground of the operation unit, there is a possibility that the leakage current from the treatment tool does not appropriately flow to the ground.

  On the other hand, if the operation wire is made thick so that current can easily flow, there is a problem that the diameter of the insertion portion is increased.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an ultrasonic endoscope that can appropriately release leakage current leaking to a stand when using a high-frequency treatment instrument or the like to the ground. And

  In order to achieve the above object, an ultrasonic endoscope according to an aspect of the present invention includes an insulating distal end body disposed at the distal end of an insertion portion to be inserted into a body cavity, and an end portion body supported by the distal end body. An ultrasonic transducer, a treatment instrument stand that is provided so as to be able to stand on the distal end body, a conductive tubular member that is connected to the proximal end side of the distal end body and is electrically grounded, and a treatment instrument stand A conductive connection member for electrically connecting the table and the tubular member.

  According to one aspect of the present invention, since the treatment instrument stand is grounded via the connecting member and the tubular member, a leakage current leaks to the treatment instrument stand when using a high-frequency treatment instrument or the like. However, the leakage current flows to the tubular member connected to the proximal end side of the distal end portion, and flows from the tubular member to the ground (GND). Therefore, the leakage current leaked from the treatment instrument to the treatment instrument stand can be appropriately released to the ground.

  In the treatment instrument endoscope apparatus according to another aspect of the present invention, the insertion portion has a curved portion including a plurality of angle rings connected to the proximal end side of the distal end portion main body, and the tubular member has a plurality of angles. It is preferable that it is an angle ring of the front end side among rings.

  In the treatment instrument endoscope apparatus according to still another aspect of the present invention, a drive mechanism unit that accommodates and holds a drive component that rotatably supports the treatment instrument stand and rotates the treatment instrument stand, The drive mechanism portion that is electrically connected to the treatment instrument stand is held by the distal end body, the tubular member is connected to the outer peripheral portion on the proximal end side of the distal end portion body, and the connection member is a hole formed in the distal end portion body. It is preferable to be disposed so as to be in contact with the drive mechanism and the tubular member.

  In the treatment instrument endoscope apparatus according to still another aspect of the present invention, the drive mechanism unit includes a rotation shaft that rotatably supports the treatment instrument stand, and a drive transmitted to the rotation shaft by an operation wire. A lever member that can rotate integrally with the treatment instrument stand by force, and a main body portion that rotatably supports the rotation shaft and accommodates the lever member can be provided.

  In the treatment instrument endoscope apparatus according to another aspect of the present invention, the connection member preferably contacts the main body.

  In the treatment instrument endoscope apparatus according to still another aspect of the present invention, the main body portion passes the treatment instrument inserted through the treatment instrument insertion passage disposed inside the insertion portion into a space where the treatment instrument stand is disposed. It can be set as the form which has the treatment tool penetration hole to derive.

  ADVANTAGE OF THE INVENTION According to this invention, the leakage current which leaks to a treatment tool stand at the time of use of a high frequency treatment tool etc. can be escaped appropriately to a ground.

Overall view of an ultrasonic endoscope in which the treatment instrument stand of the present invention is incorporated The perspective view which showed the external appearance of the front-end | tip part of an insertion part Plan view (top view) showing the appearance of the tip of the insertion section Perspective view showing the stand assembly Sectional view along arrow 5-5 in FIG. The figure which showed the standing lever of a lever accommodating part The perspective view which showed the connection part of a stand assembly and a curved part 8-8 cross-sectional view of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is an overall view of an ultrasonic endoscope 1 to which the present invention is applied.

  An ultrasonic endoscope 1 (hereinafter simply referred to as an endoscope 1) in FIG. 1 includes an operation unit 10 that is held by a practitioner and performs various operations, an insertion unit 12 that is inserted into a body cavity of a patient, It comprises a universal cord 14 for connecting the endoscope 1 to a system component device such as a processor device (not shown) constituting the endoscope system and a light source device.

  The operation unit 10 is provided with various operation members operated by a practitioner. For example, an angle knob 16, a standing operation lever 18, an air / water supply button 20, a suction button 22, and the like whose functions are described later are provided. It has been.

  In addition, the operation unit 10 is provided with a treatment instrument introduction port 24 through which a treatment instrument is inserted into a treatment instrument insertion path (treatment instrument insertion channel) that is inserted through the insertion section 12.

  The insertion part 12 is extended from the front-end | tip of the operation part 10, and the whole is formed in the elongate shape by a small diameter.

  Moreover, the insertion part 12 is comprised by the soft part 30, the curved part 32, and the front-end | tip part 34 in order toward the front end side from the base end side.

  The soft portion 30 occupies most of the insertion portion 12 from the proximal end side, and has flexibility to bend in an arbitrary direction. When the insertion part 12 is inserted into the body cavity, the flexible part 30 bends along the insertion path into the body cavity.

  The bending portion 32 is configured to bend in the vertical direction and the left-right direction by rotating the angle knob 16 of the operation unit 10, and the distal end portion 34 is directed in a desired direction by bending the bending portion 32. Can be done.

  As will be described in detail later, the distal end portion 34 includes an imaging unit and an illuminating unit for capturing an observation image in the body cavity, an ultrasonic transducer for acquiring an ultrasonic image, and a treatment instrument inserted from the treatment instrument introduction port 24. A treatment instrument deriving unit for deriving, a treatment instrument erecting base for erecting the treatment instrument derived from the treatment instrument deriving unit, and the like are provided.

  The universal cord 14 includes an electric cable, a light guide, and a fluid tube inside. A connector is provided at an end (not shown) of the universal cord 14, and the connector is connected to a predetermined system configuration device that constitutes an endoscope system such as a processor device and a light source device. The endoscope 1 is supplied with power, control signals, illumination light, liquid / gas, and the like necessary for the operation of the endoscope 1, and is also acquired by observation image data acquired by the imaging unit or an ultrasonic transducer. Ultrasonic image data is transmitted from the endoscope 1 to the system component apparatus. Note that the observation image and the endoscopic image transmitted to the system configuration apparatus are displayed on a monitor so that a practitioner or the like can observe.

  Then, the structure of the front-end | tip part 34 of the insertion part 12 is demonstrated. 2 and 3 are a perspective view and a plan view (top view) showing the external appearance of the tip portion 34.

  The distal end portion 34 has a distal end portion main body (frame body) 36 that forms an outer wall and an inner partition wall thereof, and is disposed at the distal end portion 34 in an accommodating portion (accommodating chamber) defined by the distal end portion main body 36. Each component is accommodated and held.

  Although details are omitted, a part of the tip end body 36 can be detachably removed as a separate block, and each component can be assembled in a predetermined accommodating portion with the separate block removed. Yes. After assembling each component into the housing portion, the separate block is attached to the tip body 36 so that each component is housed and held in the housing portion and fixed to the tip portion 34.

  The tip portion main body 36 is formed of an insulating material having an insulating property, for example, a resin material such as a plastic such as methacrylic resin or polycarbonate.

  As shown in FIGS. 2 and 3, the distal end portion 34 includes a base portion 40 and an extending portion 42 extending from the base portion 40 toward the distal end side.

  The extending portion 42 is provided with a convex ultrasonic transducer 50 in which a large number of ultrasonic transducers for transmitting and receiving ultrasonic waves are arranged in a convex shape. Data for generating an ultrasonic image of the body tissue is acquired by the ultrasonic transducer 50.

  The base 40 is provided with an observation window 44, illumination windows 46R and 46L, an air / water supply nozzle 48, and a treatment instrument outlet 58.

  The observation window 44 is provided on the left inclined surface 41L facing obliquely upward at the front end side, and an imaging optical system and a solid-state imaging device constituting the imaging unit are provided in the base 40 on the back side of the observation window 44. It is housed as an integrally assembled imaging unit. As a result, light from the subject that is the visual field range of the imaging unit is taken in from the observation window 44, and a subject image is formed by the imaging optical system, and is picked up as an observation image by the solid-state imaging device.

  The illumination windows 46R and 46L are respectively provided on the right slope 41R facing obliquely upward at the front end side and the left slope 41L, and the interior of the base 40 on the back side of the illumination windows 46R and 46L is illuminated. The light emission part which comprises a part is accommodated. Illumination light transmitted from the light source unit connected to the universal cord 14 through the light guide is emitted from the light emitting unit, and the illumination light is irradiated to the subject in the visual field range of the imaging unit through the illumination windows 46R and 46L. It has become so.

  The air / water supply nozzle 48 is provided on the left slope 41L, and water or air is jetted from the air / water supply nozzle 48 toward the observation window 44 by the operation of the air / water supply button 20 of the operation unit 10. The observation window 44 is cleaned.

  The treatment instrument derivation unit 58 is provided at the center of the base 40, and the treatment instrument inserted from the treatment instrument introduction port 24 of the operation unit 10 is derived from the treatment instrument derivation unit 58.

  The treatment instrument outlet 58 is formed with a concave treatment instrument standing space 62, and a treatment instrument insertion hole 64 is provided on the base end side.

  The treatment instrument insertion hole 64 communicates with a treatment instrument insertion path (treatment instrument insertion channel) inserted into the insertion section 12, and the treatment instrument inserted from the treatment instrument introduction port 24 of the operation section 10 is this treatment instrument. It is led out from the insertion hole 64 to the treatment instrument standing space 62.

  At a position in front of the treatment tool insertion hole 64 in the treatment tool standing space 62, an upright stand (treatment tool stand) 60 is disposed.

  The stand 60 is made of a metal material such as stainless steel, and has a concave guide surface 60a that curves upward from the proximal end side of the distal end portion 34 toward the distal end side on the upper surface side. The treatment tool led out from the treatment tool insertion hole 64 is bent upward along the guide surface 60a with respect to the axial direction of the distal end portion 34 (longitudinal axis direction of the insertion portion 12) to form the treatment tool lead-out port 66. It is led out from the upper side opening of the component standing space 62.

  Further, the stand 60 is configured to stand up by the operation of the stand-up operation lever 18 of the operation unit 10, and the treatment tool derivation unit is configured by adjusting the stand-up angle from the lying state by raising the stand 60. The derivation direction (derivation angle) of the treatment instrument derived from 58 can be adjusted.

  Note that the treatment instrument insertion path is also connected to a suction channel, and by operating the suction button 22 of the operation unit 10, body fluid or the like can be sucked from the treatment tool lead-out unit 58.

  Next, the upright assembly 72 that supports and drives the upright 60 at the distal end portion 34 will be described.

  4 is a perspective view showing the entire stand assembly 72, and FIG. 5 is a cross-sectional view taken along arrow 5-5 in FIG.

  The stand assembly 72 is integrally assembled as shown in FIG. 4 and is received and held in a predetermined receiving portion of the tip body 36 that forms the outer wall and inner partition of the tip 34 as shown in FIG. 34 is fixed inside.

  Further, the stand assembly 72 is made of a metal material such as stainless steel except for a seal member described later, and is electrically connected as a whole.

  As shown in FIG. 4, the stand assembly 72 includes a stand 60, and the stand 60 includes an assembly body 80 (drive mechanism unit).

  The assembly main body 80 includes a base portion 82 disposed on the lower side of the stand 60, a lever accommodating portion 84 disposed on the side of the base portion 82 and the stand 60, a base portion 82, and a lever accommodating portion. 84, and a treatment instrument insertion portion 86 that is extended from the rear end side and is disposed on the rear side of the stand 60.

  The entire base portion 82, the outer wall portion of the lever accommodating portion 84, and the entire treatment instrument insertion portion 86 are integrally formed of a metal member.

  2 and 3 (and FIG. 5), the stand assembly 72 is housed in the distal end portion 34 (a predetermined housing portion of the distal end portion main body 36) as shown in FIGS. The upper wall surface 82a of the base portion 82 of the assembly body 80, the wall surface 84a of the lever accommodating portion 84 on the upright table 60 side, the wall surface 86a (see FIG. 4) of the treatment instrument insertion portion 86 on the upright table 60, and the tip The wall surface 36b (see FIG. 5) of the partition wall 36a of the body part 36 forms a wall surface that defines a treatment instrument standing space 62 in which the stand 60 is disposed.

  In FIG. 5, reference numeral 38 denotes an imaging optical system that constitutes the imaging unit, and the housing unit in which the stand assembly 72 is accommodated in the distal end portion 34 and the components of the imaging unit are integrally assembled. The housing portion in which the imaging system assembly is housed is isolated by a partition wall portion 36a.

  As shown in FIGS. 4 and 5, the base portion 82 of the assembly main body 80 includes a recess 82 b along the axial direction of the distal end portion 34 on the side opposite to the lever accommodating portion 84, and an axial direction of the distal end portion 34. A columnar shaft hole 82c that communicates from the recess 82b to the space 84b (see FIG. 5) inside the lever accommodating portion 84 is formed in a direction substantially orthogonal to the cylinder.

  A support portion 60b projecting from the upright stand 60 is fitted into the recess 82b, and a rotating shaft 90 is rotatably inserted into the shaft hole 82c. And the front-end | tip part 90a of the rotating shaft 90 is fitted by the fitting hole 60c formed in the support part 60b of the stand 60. FIG.

  As a result, the stand 60 and the rotary shaft 90 are connected, and the stand 60 is rotatably supported by the base 82 via the rotary shaft 90 in a direction orthogonal to the axial direction of the distal end portion 34. Yes. In conjunction with the rotation of the rotating shaft 90, the stand 60 rotates (stands up) about the rotating shaft 90.

  In addition, the fitting hole 60c of the support part 60b of the stand 60 and the tip part 90a of the rotating shaft 90 are fixed by a keyway, screw fastening, or the like.

  Further, a circumferential groove 90b is formed on the outer peripheral portion of the rotating shaft 90 (see FIG. 5), and a packing (O-ring) 92 is fitted into the groove 90b as a seal member. As a result, the packing 92 is press-fitted between the inner peripheral surface of the shaft hole 82 c of the base portion 82 and the outer peripheral surface of the rotating shaft 90, and the gap between the inner peripheral surface of the shaft hole 82 c and the outer peripheral surface of the rotating shaft 90 is increased. The fluid is prevented from flowing from the treatment instrument standing space 62 into the space portion 84b of the lever accommodating portion 84 through the gap.

  The lever accommodating portion 84 of the assembly main body 80 has the space portion 84b inside as described above, and the upright lever 96 (lever member) is accommodated in the space portion 84b as shown in FIGS. FIG. 6 is a perspective view showing the inside of the space portion 84b from the wall surface side opposite to the wall surface 84a side where the stand 60 of the lever accommodating portion 84 is disposed.

  The upright lever 96 is formed in a long plate shape, and one end side (base end side) in the longitudinal direction is connected to the base end portion of the rotation shaft 90 of the base portion 82. As a result, the upright lever 96 rotates around the rotation shaft 90 in conjunction with the rotation of the rotation shaft 90.

  Therefore, when the upright lever 96 is rotated, the rotating shaft 90 is rotated and the upright 60 is raised.

  The rotating shaft 90 and the upright lever 96 may be integrally formed, or separate members may be integrally connected.

  Moreover, the wall member 84c (refer FIG. 5) which forms the wall surface on the opposite side to the wall surface 84a side where the stand 60 of the lever accommodating part 84 is arrange | positioned can be removed from the lever accommodating part 84, and the wall member 84c was removed. In this state, the rotary shaft 90, the upright lever 96, and the like can be accommodated in the lever accommodating portion 84.

  As shown in FIG. 5, a groove 96a in a direction perpendicular to the rotation shaft 90 is formed at the tip of the standing lever 96, and a circle from the front to the back of the standing lever 96 is formed at a position intersecting the groove 96a as shown in FIG. A through hole 96b penetrating in a columnar shape is formed.

  A cylindrical columnar member 180 having substantially the same diameter is rotatably fitted in the through hole 96b, and the operation wire 120 of the control cable 74 is attached to the columnar member 180.

  As a result, when the operation wire 120 moves back and forth (push and pull operation), the upright lever 96 rotates (swings) about the rotating shaft 90, and the upright stand 60 is raised via the rotating shaft 90 in conjunction with this. It is supposed to work. For example, in FIG. 6, the stand 60 can be raised in a range from a lying state indicated by a solid line to an upright state indicated by a two-dot chain line.

  The control cable 74 is disposed through the insertion portion 12 from the operation portion 10 of the endoscope 1, and the distal end side is connected to the side wall portion 84 d of the lever accommodating portion 84 as shown in FIGS. 4 and 6.

  The control cable 74 is configured such that an operation wire 120 is slidably inserted into a lumen of a flexible sleeve (guide tube) that is tubular and flexible.

  The operation wire 120 is formed of, for example, a stranded wire obtained by twisting strands made of a plurality of fine metal wires. The flexible sleeve is formed by, for example, mounting a heat-shrinkable tube on a tubular close-contact coil.

  At the connection portion between the control cable 74 and the side wall portion 84 d of the lever housing portion 84, the end portion of the flexible sleeve is fixed to the side wall portion 84 d of the lever housing portion 84.

  On the other hand, the operation wire 120 passes through an insertion hole (not shown) formed in the side wall portion 84d, is inserted into the space portion 84b of the lever housing portion 84, and is fixed to the columnar member 180 as described above.

  The proximal end side of the control cable 74 is connected to the inside of the operation unit 10 via the standing operation lever 18 via a power transmission mechanism, and in conjunction with the swing operation (slide operation) of the standing operation lever 18, the operation wire 120 moves forward and backward in the axial direction (longitudinal axis direction of the insertion portion 12).

  As a result, when the practitioner swings (slides) the standing operation lever 18 of the operation unit 10, the operation wire 120 moves forward and backward by the operating force, and the standing lever 96 is centered on the rotating shaft 90 as described above. The stand 60 is rotated (swinged) so that the stand 60 can stand up.

  In the treatment instrument insertion portion 86 of the assembly main body 80, a treatment instrument insertion hole 64 penetrating in a columnar shape is formed as shown in FIG.

  The distal end side of the cylindrical connecting member 110 is fitted and fixed in the treatment instrument insertion hole 64. A distal end portion of a tube 112 that forms a treatment instrument insertion path is fitted and attached to the rear end side of the connecting member 110.

  As a result, the treatment instrument inserted from the treatment instrument introduction port 24 of the operation unit 10 and inserted through the tube 112 serving as the treatment instrument insertion path as described above is treated via the connecting member 110 and the treatment instrument insertion hole 64. It is led out to the standing space 62.

  Then, the treatment tool led out to the treatment tool standing space 62 is raised by the stand 60 and led out from the treatment tool standing space 62.

  In the stand assembly 72 configured as described above, assembly parts other than the packing 92 are formed of a metal material in order to obtain high strength, and the whole is electrically connected.

  When a high-frequency treatment instrument is used as a treatment instrument derived from the treatment instrument deriving unit 58, when a leakage current flows from the treatment instrument to the stand 60, the connection between the distal end portion 34 and the bending portion 32 described below is performed. According to the configuration of the part, the leakage current flows to the angle ring (node ring) of the bending part 32 and is discharged from the angle ring to the ground of the operation part 10 through the metal outer tube of the soft part 30.

  Thereby, the leakage current leaked from the treatment tool to the stand 60 can be appropriately released to the ground.

  The structure of the connection part of the bending part 32 of the front-end | tip part 34 is demonstrated. 7 is a perspective view showing the distal end portion 34 from the base end side, and FIG. 8 is a cross-sectional view taken along the line 8-8 in FIG.

  FIG. 7 shows a control cable 74 connected to the assembly body 80 of the stand assembly 72 held by the tip body 36 of the tip 34 and a tube 112 forming a treatment instrument insertion path. They pass through the inside of the bending portion 32.

  A connecting portion 200 to the bending portion 32 is formed on the proximal end side outer peripheral portion of the base portion 40 of the distal end portion 34, and the outer peripheral surface of the distal end portion main body 36 is reduced in diameter relative to the distal end side in the connecting portion 200. Further, an intermediate diameter portion 202 and a small diameter portion 204 having a smaller diameter than the intermediate diameter portion 202 are formed on the proximal end side of the intermediate diameter portion 202.

  The distal end ring 250 of the bending portion 32 of the endoscope 1 is fitted to the outer peripheral portion of the small diameter portion 204 of the connecting portion 200. Then, a screw (not shown) inserted through the insertion hole 252 formed in the tip ring 250 is tightened into a screw hole 210 (see FIG. 7) formed in the small diameter portion 204, and the tip ring 250 is attached to the small diameter portion 204. It is supposed to be fixed.

  Here, the distal end ring 250 of the bending portion 32 is a state-of-the-art angle ring among a plurality of annular angle rings (node rings) (not shown) that are rotatably connected to the bending portion 32. .

  Although the detailed description will be omitted because it is well known, the plurality of connected angle rings are pushed up and down by the operation wire attached to the tip ring 250 by the operation of the angle knob 16 of the operation unit 10, so that the whole is vertically and horizontally It comes to curve.

  Each of these angle rings is formed of a metal material and is electrically connected, and a metal outer tube (such as a screw tube in which a band-shaped metal is spirally wound) of the flexible portion 30 on the proximal end side of the curved portion 32. Is electrically connected. The outer metal tube of the soft part 30 is connected to the ground (GND) of the operation part 10, that is, a member having a ground potential.

  In addition, a conduction hole 220 is formed in the small diameter portion 204 and the tip ring 250 fitted to the small diameter portion 204.

  As shown in FIG. 8, the conduction hole 220 includes a truncated cone-shaped through hole 220 a formed in the tip ring 250, and an upright stand assembly 72 of the tip body 36 that communicates with the through hole 220 a from the outer peripheral surface of the small diameter portion 204. A through hole 220b penetrating to the accommodating portion to be accommodated, and a screw hole 220c (FIG. 4) formed in the assembly body 80 (wall portion of the treatment instrument insertion portion 86) of the stand assembly 72 in communication with the through holes 220a and 220b. See also).

  A metal screw (disc screw) 270 (see FIG. 7) is fitted into the conduction hole 220, and the screw 270 is inserted through the through hole 220a of the tip ring 250 and the through hole 220b of the tip body 36, and the assembly body. It is fixed by being screwed into the 80 screw holes 220c. At this time, the head of the screw 270 is embedded in the through hole 220 a of the tip ring 250.

  As a result, the conductive screw 270 contacts the assembly body 80 and the tip ring 250, and the assembly body 80 and the tip ring 250 are electrically connected via the screw 270.

  An outer skin layer 260 (see FIG. 8) that covers the outer periphery of the bending portion 32 is fitted to the outer peripheral portion of the intermediate diameter portion 202 of the connecting portion 200 so as to extend beyond the distal end of the distal end ring 250, so that winding or bonding is performed. It is fixed by application of the agent.

  According to the configuration of the connecting portion 200 between the distal end portion 34 and the bending portion 32 described above, when leakage current leaks to the stand 60 due to use of a high-frequency treatment instrument or the like, the leakage current is electrically connected to the stand 60. Flows from the assembly body 80 in conduction to the distal end ring 250 of the bending portion 32 via the screw 270.

  Since the tip ring 250 is connected to the ground (GND) of the operation unit 10 together with the subsequent angle ring, the leakage current flowing through the tip ring 250 is discharged to the ground.

  Therefore, even when a leakage current flows from the treatment tool to the stand 60, the leakage current can be released to the ground.

  In addition, since heat generated by other components such as an imaging unit (imaging system assembly) arranged at the distal end portion 34 is radiated to the angle ring of the bending portion 32 via the stand assembly 72 and the screws 270, the distal end There is also an effect that the portion 34 is cooled.

  In the above embodiment, the assembly body 80 and the distal end ring 250 of the bending portion 32 are electrically connected by the screw 270 fitted in the conduction hole 220. However, the conductive member is not limited to the screw 270 and the assembly body 80 and the distal end are connected. What is necessary is just to make it contact the ring 250. FIG.

  For example, instead of fixing a conductive member such as the screw 270 to the conduction hole 220 by screw connection, a conductive pin may be pressed into the conduction hole 220 and fixed, or the tip ring 250 or the assembly body may be fixed. 80, without forming the through hole 220a and the screw hole 220c, the through hole 220b is formed only in the tip body 36, and the conductive member fitted into the through hole 220b is connected to the inner peripheral surface of the tip ring 250 and the assembly body. It is only necessary to contact the outer surface of 80.

  Further, the outer skin layer 260 of the curved portion 32 is composed of, for example, a mesh tube (blade) made of a braided metal wire covering the outer periphery of the angle ring, and an outer skin made of, for example, fluororubber covering the outer periphery of the mesh tube. There is a case. In that case, the assembly body 80 and the tip ring 250 may not be connected by a conductive member, but the assembly body 80 and the mesh tube of the outer skin layer 260 may be connected by a conductive member.

  For example, a conduction hole penetrating from the outer peripheral surface to the assembly main body 80 is formed in the intermediate diameter portion 202 of the connecting portion 200 of the distal end portion 34, and a conductive member is fitted into the conduction hole to electrically connect the assembly main body 80 and the net tube. It can be set as the form which connects automatically.

  That is, among the components of the angle ring and the outer skin layer 260 that are the outer pipes of the curved portion 32, any metal outer pipe (tubular member) and the assembly body 80 are connected by a conductive member to electrically It suffices to make it conductive.

  Moreover, the site | part which makes an electroconductive member contact with respect to the stand assembly 72 may be arbitrary sites, as long as it is a site | part which is electrically connected with the stand 60. FIG.

  Further, in the above embodiment, the embodiment in the case where the present invention is applied to the ultrasonic endoscope has been described. However, the present invention provides a stand assembly having an insulating tip body as in the above embodiment. It can be applied to the endoscope housed and held in (1).

  DESCRIPTION OF SYMBOLS 1 ... Ultrasound endoscope (endoscope), 10 ... Operation part, 12 ... Insertion part, 14 ... Universal cord, 16 ... Angle knob, 18 ... Standing operation lever, 20 ... Air supply / water supply button, 22 ... Suction Button 24, treatment instrument introduction port 30, soft part 32, curved part 34 34 tip part 36 ... tip part main body 40 base part 42 extension part 44 observation window 46 R, 46 L illumination window 48 ... Air supply / water supply nozzle, 50 ... Ultrasonic transducer (ultrasonic transducer), 58 ... Treatment instrument lead-out part, 60 ... Standing stand, 62 ... Treatment instrument standing space, 64 ... Treatment instrument insertion hole, 66 ... Treatment Tool outlet 70, treatment tool erecting device, 72 ... stand base assembly, 74 ... control cable, 76 ... stand base operation part, 80 ... assembly body, 82 ... base part, 84 ... lever housing part, 86 ... treatment tool Insertion part, 90 ... rotating shaft, 92 ... Kin (O-ring), 96 ... Standing lever, 110 ... Connecting member, 120 ... Operation wire, 180 ... Cylindrical member, 200 ... Connecting part, 202 ... Intermediate diameter part, 204 ... Small diameter part, 220 ... Conduction hole, 220a ... Through Hole, 220b ... Screw hole, 250 ... Tip ring, 260 ... Outer skin layer, 270 ... Screw

Claims (6)

An insulating tip body disposed at the tip of the insertion portion to be inserted into the body cavity;
An ultrasonic transducer supported by the tip body;
A treatment instrument stand provided so as to be able to stand on the distal end body;
A conductive tubular member connected to the proximal end side of the distal end body and electrically grounded;
A conductive connecting member for electrically connecting the treatment instrument stand and the tubular member;
An ultrasonic endoscope comprising: The insertion portion has a curved portion composed of a plurality of angle rings coupled to the proximal end side of the distal end portion main body,
The ultrasonic endoscope according to claim 1, wherein the tubular member is an angle ring on a distal end side among the plurality of angle rings. A drive mechanism unit that rotatably supports the treatment instrument stand and accommodates and holds a drive component that rotates the treatment instrument stand, wherein the drive mechanism unit is electrically connected to the treatment instrument stand. Held by the tip body,
The tubular member is connected to a base end side outer peripheral portion of the distal end portion main body,
The ultrasonic endoscope according to claim 1, wherein the connection member is inserted through a hole formed in the distal end portion main body so as to be in contact with the drive mechanism portion and the tubular member. The drive mechanism is
A rotating shaft that rotatably supports the treatment instrument stand;
A lever member that can rotate integrally with the treatment instrument stand by a driving force transmitted by an operation wire with respect to the rotation shaft;
A main body that rotatably supports the rotating shaft and that houses the lever member;
The ultrasonic endoscope according to claim 3, comprising:   The ultrasonic endoscope according to claim 4, wherein the connection member is in contact with the main body.   The said main-body part has a treatment tool penetration hole which guide | induces the treatment tool which penetrated the treatment tool insertion path arrange | positioned inside the said insertion part to the space where the said treatment tool stand is arrange | positioned. The described ultrasonic endoscope.

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