JP2012050758A - Hook-like high-frequency knife for flexible endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hook-like high frequency knife for a flexible endoscope in which a hook-like electrode can be formed in the optimal firmness of the member different from an electroconductive operating wire, the length of the distal end part is not long, the hook-like electrode can be formed into a simple and easily machinable shape, and excellent incision capability can be secured by sufficiently securing the length of the distal end folded and bent.SOLUTION: The part 2a other than the distal end part 2b of the hook-like electrode 2 is formed into a straight shaft shape parallel to the axis line of the distal end part of the flexible sheath 1, the electrode fixing hole 5 to which the proximal end part of the hook-like electrode 2 is fitted and secured and the wire fixing hole 6 to which the distal end part of the electroconductive operating wire 3 is fitted and secured are formed side-by-side in the connecting member 4 connecting the hook-like electrode 2 and the electroconductive operating wire 3, and the electrode fixing hole 5 is formed at the position decentered from the axial line position of the distal end part of the flexible sheath 1.

Description

  The present invention relates to a hook-like high-frequency knife for a flexible endoscope that is passed through a treatment instrument insertion channel of a flexible endoscope and used for high-frequency incision treatment of a mucous membrane in a body cavity or the like.

  In general, a hook-shaped high-frequency knife for a flexible endoscope is formed in an electrically insulating flexible sheath that is inserted into and removed from a treatment instrument insertion channel of an endoscope, and a shape in which a distal end portion is bent sideways. A conductive hook-shaped electrode arranged to project forward from the distal end of the flexible sheath, and an axial direction in the flexible sheath to project the hook-shaped electrode from the distal end of the flexible sheath And a flexible conductive operation wire that is inserted and removably inserted.

  Then, the proximal end portion of the hook-shaped electrode and the distal end portion of the conductive operation wire are connected by a conductive connecting member, and a high-frequency current is passed through the hook-shaped electrode through the conductive operation wire and the connecting member, thereby The hook-like electrode protrudes and retracts from the distal end of the flexible sheath by advancing and retracting the sexual manipulation wire (for example, Patent Document 1).

  In addition, the hook-shaped electrode has a base end portion formed in a bent shape that gradually moves away from the axial position of the flexible sheath, and the length of the bent portion of the hook-shaped electrode can be secured. There is (for example, Patent Document 2).

JP2007-215786A JP2005-230080

  In the invention described in Patent Document 1, the proximal end portion of the hook-shaped electrode and the distal end portion of the conductive operation wire are connected in series at the axial position of the distal end portion of the flexible sheath by the conductive connecting member. It has a configuration.

  However, when the proximal end portion of the hook-shaped electrode and the distal end portion of the conductive operation wire are connected in series by the connecting member, the length of the connecting member, that is, the length of the distal end hard portion becomes longer. There are cases where insertion / removal to / from the insertion channel is restricted or hindered.

  In addition, since the proximal end portion of the hook-shaped electrode is located at the axial position of the distal end portion of the flexible sheath, the length of the bent portion of the hook-shaped electrode cannot be sufficiently secured. May not be sufficient.

  On the other hand, in the invention described in Patent Document 2, the hook-shaped electrode is formed by extending the conductive operation wire itself, and a connecting member for connecting the two is not necessary, so the tip hard portion length is formed short. However, in some cases, the hook-shaped electrode, which is an extension of the conductive operation wire, is weak and the mucosal incision operation is difficult.

  In addition, since the base end side portion of the hook-shaped electrode is formed in a bent shape, it is possible to secure the length of the bent portion at the distal end, however, the workability of the hook-shaped electrode is poor and the yield is low. Even if there is a slight dimensional error, the possibility of malfunction will increase.

  According to the present invention, the hook-shaped electrode can be formed with an optimum waist strength by using a separate member from the conductive operation wire, and the length of the hard tip portion is not increased. An object of the present invention is to provide a hook-like high-frequency knife for a flexible endoscope that can be formed into a good shape and that can sufficiently secure the length of the bent portion of the tip and ensure excellent cutting ability. To do.

  In order to achieve the above object, a hook-shaped high-frequency knife for a flexible endoscope according to the present invention includes an electrically insulating flexible sheath that is inserted into and removed from a treatment instrument insertion channel of the flexible endoscope, A conductive hook electrode formed in a shape in which the tip portion is bent to the side and arranged to protrude forward from the tip of the flexible sheath, and the hook electrode protrudes from the tip of the flexible sheath. And a flexible conductive operating wire inserted and disposed in the flexible sheath so as to be able to advance and retreat in the axial direction in order to be immersed, and a proximal end portion of the hook-shaped electrode and a distal end portion of the conductive operating wire, In the hook-shaped high-frequency knife for flexible endoscopes, which are connected by a conductive connecting member, the portion other than the tip of the hook-shaped electrode is a straight shaft that is parallel to the axis of the tip of the flexible sheath. The connecting member is formed with an opening toward the front Thus, an electrode fixing hole in which the proximal end portion of the hook-shaped electrode is inserted and fixed, and a wire fixing hole in which a distal end portion of the conductive operation wire is inserted and fixed in a rearward direction are formed side by side. The electrode fixing hole is formed at a position eccentric from the axial position of the distal end portion of the flexible sheath.

  The hook-shaped electrode may be formed in an L-shape as a whole, and the electrode fixing hole and the wire fixing hole are formed in a cylindrical member loosely inscribed in the flexible sheath. You may form in the provided shape.

  According to the present invention, the portion other than the tip portion of the hook-like electrode is formed in a straight shaft shape parallel to the axis of the tip portion of the flexible sheath, and connects the hook-like electrode and the conductive operation wire. In the member, an electrode fixing hole and a wire fixing hole are formed in parallel, and the electrode fixing hole is formed at a position deviated from the axial position of the distal end portion of the flexible sheath. The conductive operation wire can be formed to the optimum waist strength with a separate member, the tip hard part length does not become long, and the hook-like electrode can be formed in a simple and good workability shape. In addition, it is possible to obtain special effects such as ensuring a sufficient length of the bent portion and ensuring an excellent incision ability.

It is side surface sectional drawing of the front-end | tip part of the hook-shaped high frequency knife for flexible endoscopes which concerns on 1st Example of this invention. It is a side view which shows the whole structure of the hook-shaped high frequency knife for flexible endoscopes which concerns on 1st Example of this invention. It is a perspective view of the front-end | tip part of the hook-shaped high frequency knife for flexible endoscopes which concerns on 1st Example of this invention. It is side surface sectional drawing of the state in which the hook-shaped electrode was immersed in the front-end | tip of a flexible sheath in the hook-shaped high frequency knife for flexible endoscopes concerning 1st Example of this invention. It is side surface sectional drawing of the front-end | tip part of the hook-shaped high frequency knife for flexible endoscopes concerning 2nd Example of this invention. It is side surface sectional drawing of the front-end | tip part of the hook-shaped high frequency knife for flexible endoscopes concerning 3rd Example of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 2 shows the overall configuration of a hook-like high-frequency knife for a flexible endoscope according to a first embodiment of the present invention.

  Reference numeral 1 denotes an electrically insulating flexible sheath made of, for example, a fluororesin tube that can be inserted into and removed from a treatment instrument insertion channel of a flexible endoscope (not shown). For example, the flexible sheath 1 has an outer diameter of about 2 mm and a length of about 1 to 2 m. In FIG. 2, only the vicinity of both ends of the flexible sheath 1 is illustrated, and the intermediate portion is not illustrated.

  A conductive hook-like electrode 2 formed in a shape in which the distal end portion is bent slightly to the side is projected and retracted forward from the distal end of the flexible sheath 1 at the most distal portion of the flexible sheath 1. Has been placed.

  The hook-shaped electrode 2 is formed in an L-shaped shape as a whole, and is a straight shaft-shaped rod-shaped portion 2a parallel to the axis of the distal end portion of the flexible sheath 1, and a side from the distal end of the rod-shaped portion 2a. It consists of a bent end portion 2b that is bent in the direction.

  In the flexible sheath 1, a flexible conductive operation wire 3 for causing the hook-shaped electrode 2 to project and retract from the distal end of the flexible sheath 1 by remote operation from the proximal end side of the flexible sheath 1. However, it is inserted through the entire length so as to freely advance and retract in the axial direction.

  An operation unit 10 is connected to the proximal end of the flexible sheath 1 to move the conductive operation wire 3 forward and backward in the axial direction. Then, by sliding the slide operation member 12 disposed on the operation unit main body 11 as indicated by the arrow A, the conductive operation wire 3 advances and retreats in the axial direction within the flexible sheath 1, and the arrow B As shown, the hook-shaped electrode 2 protrudes from the tip of the flexible sheath 1.

  The operation unit 10 is provided with a connection terminal 13 for connecting a high-frequency power cord (not shown). By connecting the high-frequency power cord to the connection terminal 13, the conductive operation wire 3 (and a connection to be described later). A high-frequency current can be applied to the hook-like electrode 2 via the member 4).

  1 and 3 show a hook-like electrode 2 disposed at the distal end portion of the flexible sheath 1 and its periphery. As shown in FIG. 1, the hook-like electrode 2 is composed of only the rod-like portion 2a parallel to the axis of the tip portion of the flexible sheath 1 and the tip bent portion 2b which is bent at a right angle with respect to the rod-like portion 2b. It is formed in a simple L-shape, has good workability and yield, and is unlikely to cause malfunction.

  The proximal end portion of the hook-shaped electrode 2 and the distal end portion of the conductive operation wire 3 are connected by a conductive connecting member 4. Accordingly, the hook-shaped electrode 2 and the conductive operation wire 3 can be formed as completely separate members. For example, even when a flexible stranded wire is used as the conductive operation wire 3, the hook-shaped electrode 2 is used as the hook-shaped electrode 2. Can be made of a material that is sufficiently strong and easy to perform an incision procedure.

  The connecting member 4 is a metal columnar member that is loosely inscribed on the inner periphery of the flexible sheath 1 and is made of, for example, stainless steel. The connecting member 4 is provided with an electrode fixing hole 5 for inserting and fixing the proximal end portion of the hook-shaped electrode 2 from the front end surface side, and a wire fixing hole for inserting and fixing the distal end portion of the conductive operation wire 3. 6 is drilled from the rear end face side. These fixations can be performed, for example, by laser welding or silver brazing.

  Both the electrode fixing hole 5 and the wire fixing hole 6 are formed side by side at a position eccentric from the axial position of the distal end portion of the flexible sheath 1. Accordingly, the holes 5 and 6 can be arranged without difficulty, and the distal end of the flexible sheath 1 is formed by forming the electrode fixing hole 5 at a position eccentric from the axial position of the distal end portion of the flexible sheath 1. The length of the rod-like portion 2a that immerses inside can be sufficiently secured.

  In addition, since the electrode fixing hole 5 and the wire fixing hole 6 are formed in parallel, the length of the connecting member 4 in the axial direction can be shortened and the length of the hard portion can be shortened. Does not interfere with the insertion into the insertion channel.

  In this embodiment, both the electrode fixing hole 5 and the wire fixing hole 6 are formed in a direction parallel to the axis of the distal end portion of the flexible sheath 1. It may be formed in an inclined direction.

  A constricted portion 7 having an inner diameter smaller than the outer diameter of the connecting member 4 is formed in the vicinity of the most distal end portion of the flexible sheath 1 by thermoforming or the like. An appropriate color index 8 is loaded in a circumferential groove formed on the outer periphery of the flexible sheath 1 by forming the constricted portion 7.

  With such a configuration, when the conductive operation wire 3 is pushed in from the operation unit 10 side, the connecting member 4 cannot advance any further when the distal end surface of the connecting member 4 comes into contact with the constricted part 7, thereby The maximum protrusion length of the hook-like electrode 2 from the distal end of the flexible sheath 1 is regulated.

  Further, when the connecting member 4 is strongly pressed against the constricted portion 7, rotation in the direction around the axis is also restricted, so that the direction of the tip bent portion 2b of the hook-like electrode 2 can be fixed so as not to fluctuate.

  When the conductive operation wire 3 is pulled from the operation unit 10 side, as shown in FIG. 4, the connecting member 4 is retracted in the flexible sheath 1, and the hook-shaped electrode 2 is moved to the flexible sheath 1. (The bent end portion 2b of the hook-like electrode 2 is formed to have a length that can be immersed in the distal end of the flexible sheath 1).

  However, in this case as well, as shown in FIG. 4, the hook-shaped electrode 2 is further drawn into the flexible sheath 1 by the tip bent portion 2 b of the hook-shaped electrode 2 coming into contact with the front end portion of the constricted portion 7. It becomes a state that can not be.

  Thus, with the hook-shaped electrode 2 retracted into the flexible sheath 1, the flexible sheath 1 is inserted into and removed from the treatment instrument insertion channel of the endoscope, and the hook-shaped electrode 2 is removed from the flexible sheath 1. A mucosal incision treatment or the like can be performed by applying a high-frequency current in a state of being pushed out from the tip.

  FIG. 5 shows a hook-like high-frequency knife for a flexible endoscope according to a second embodiment of the present invention, in which the wire fixing hole 6 is located at the axial position (that is, connected) of the distal end portion of the flexible sheath 1. The connecting member 4 is formed so as to coincide with the axial position of the member 4. Other configurations are the same as those of the first embodiment.

  With this configuration, when the conductive operation wire 3 is rotated in the direction around the axis, the connecting member 4 rotates without unevenness, and the hook electrode 2 can be smoothly rotated.

  In addition, this invention is not limited to the said Example, For example, as FIG. 6 shows, as for the electrode fixing hole 5 and the wire fixing hole 6, one or both penetrates the connection member 4 to an axial direction. You may be formed in the state to do.

DESCRIPTION OF SYMBOLS 1 Flexible sheath 2 Hook-shaped electrode 2a Bar-shaped part 2b Bend part 3 Conductive operation wire 4 Connecting member 5 Electrode fixing hole 6 Wire fixing hole 7 Constriction part 10 Operation part

Claims (3)

An electrically insulating flexible sheath that is inserted into and removed from the treatment instrument insertion channel of the flexible endoscope, and a tip portion that is bent sideways, and projects forward from the distal end of the flexible sheath. A conductive hook-shaped electrode disposed so as to sunk, and the hook-shaped electrode inserted and disposed in the flexible sheath so as to be movable forward and backward in the axial direction so as to project and sunk from the distal end of the flexible sheath. A flexible endoscope hook provided with a flexible conductive operation wire, wherein a proximal end portion of the hook-shaped electrode and a distal end portion of the conductive operation wire are connected by a conductive connecting member. In a high frequency knife,
A portion other than the tip portion of the hook-shaped electrode is formed in a straight shaft shape parallel to the axis of the tip portion of the flexible sheath,
The connecting member has an electrode fixing hole formed with an opening toward the front and the base end portion of the hook-shaped electrode inserted and fixed therein, and an opening formed at the rear and the distal end portion of the conductive operation wire inserted therein. A flexible endoscope having a fixed wire fixing hole arranged in parallel, and the electrode fixing hole being formed at a position eccentric from an axial position of a distal end portion of the flexible sheath. A hook-shaped high-frequency knife for mirrors.   The hook-shaped high-frequency knife for a flexible endoscope according to claim 1, wherein the hook-shaped electrode is formed in an L-shape as a whole.   The flexible member according to claim 1 or 2, wherein the connecting member is formed in a shape in which the electrode fixing hole and the wire fixing hole are formed in a cylindrical member loosely inscribed in the flexible sheath. Hook-shaped high-frequency knife for sex endoscopes.

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