JP2011078462A - Connection part of treatment tool for endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection portion of a treatment tool for an endoscope, which is capable of connecting the proximal end of a flexible sheath to the distal end portion of an operation portion undetachably by extremely simple assembly work and obtaining structurally excellent strength. <P>SOLUTION: A falling prevention tongue piece 25, which is elastically deformed in the state of being pushed away to the side by a sheath proximal end base 16 during the operation of inserting the sheath proximal end base 16 to the base insertion hole 28 of the operation portion 20 and returns to a state before the elastic deformation when reaching a connecting position with the operation portion 20, is formed by providing a roughly U-shaped cut 26 on the sidewall of the base insertion hole 28 in the state of connecting only the rear end portion with the sidewall of the base insertion hole 28. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a connecting portion of an endoscope treatment tool.

  At the time of manufacturing an endoscope treatment tool, generally, an elongated flexible sheath side unit and an operation unit for remotely operating the flexible sheath side unit are each assembled in advance as a unit, and finally both units are connected.

  The flexible sheath side unit includes a flexible sheath, an operation wire inserted therein, a distal treatment member connected to the distal end of the operation wire, and a sheath attached to the proximal end of the flexible sheath. Most of them have a base end cap.

  In addition, there are endoscope treatment instrument systems in which flexible sheath-side units of different types and models can be used by being detachably connected to a single operation unit (for example, Patent Documents 1, 2, and 3). ).

  However, in most cases, from the viewpoint of safety, stability, etc., in the endoscope treatment instrument, the flexible sheath side unit and the operation unit are integrated so that they cannot be attached to and detached from each other. Yes.

  However, if a configuration in which the connecting portion is fixed to the operation portion with an adhesive is used, not only does the drying process take time and the cost is increased, but also a safety problem may occur with respect to the solvent treatment. Further, if a means such as press fitting or welding is used for connection and fixing, it becomes expensive.

  Therefore, by forming an elastic cantilever-like protruding piece integrally from a sheath base end cap made of a plastic material and elastically deforming the cantilever-shaped protruding piece, a notch-shaped protrusion formed on the operation portion is formed. In some cases, the tip of the cantilever-like projecting piece is engaged with the depression so that the flexible sheath side unit and the operation unit are connected and fixed (for example, Patent Document 4).

JP-A-10-309284 JP-A-11-197102 JP 2000-70281 A Special table 2002-518079

  In the invention described in Patent Document 4, just by inserting the sheath base end cap into the bore (base insertion hole) of the operation portion, the tip protrusion of the cantilever-like protruding piece engages with the notch-shaped recess, The flexible sheath side unit and the operation unit can be connected and fixed.

  However, since the cantilever-like projecting piece projectingly formed on the sheath base end cap made of plastic material has to be a structurally extremely small and fragile member (see FIG. 5 of Patent Document 4 (reference numeral 76a). 76b)), a large torsional force acts between the operation unit and the flexible sheath side unit during use, or if there is a work mistake in the assembly process, it will be relatively easily damaged and the entire unit will be defective. It may become.

  According to the present invention, the proximal end of the flexible sheath can be connected to the distal end portion of the operating portion by an extremely simple assembly operation so that it cannot be removed, and the connecting portion can obtain structurally excellent strength. It is an object of the present invention to provide a connecting portion of an endoscope treatment tool.

  In order to achieve the above object, the connecting portion of the endoscope treatment tool of the present invention is an endoscope treatment tool for connecting the proximal end of the flexible sheath to the distal end portion of the operation portion so as not to be removed. And a base end of the flexible sheath is provided with a sheath base end cap having a retaining contact surface facing forward, and a sheath base end cap at the distal end of the operation portion. Is inserted into the base insertion hole in the axial direction from the front, and the sheath base end base is elastically deformed into a state where the sheath base end base is pushed to the side by the sheath base end base during the operation of inserting into the base insertion base. When the gold reaches the connection position with the operation part, a retaining tongue is formed on the side wall of the base insertion hole to return to the state before elastic deformation and prevent the sheath base end base from coming out of the base insertion hole. Only the rear end of the retaining tongue is connected to the side wall of the mouthpiece insertion hole. In this state, a substantially U-shaped cut is formed on the side wall of the base insertion hole, and a protrusion that comes into contact with the retaining contact surface of the sheath base end cap on the inner surface of the distal end of the retaining tongue. The part is formed to protrude inward.

  In addition, stability is good when a pair of retaining tongues are provided at approximately 180 ° symmetrical positions around the axis of the mouthpiece insertion hole.

  According to the present invention, when the sheath base end cap is inserted into the cap insertion hole of the operation portion, the retaining tongue on the operation portion side is elastically pushed to the side by the sheath base end cap. When the sheath base end cap is deformed and reaches the connection position with the operating portion, the retaining tongue returns to the state before elastic deformation, and only the rear end portion of the retaining tongue has the cap insertion hole. It is formed with a substantially U-shaped cut in the side wall of the base insertion hole of the operation unit in a state connected to the side wall, so that the proximal end of the flexible sheath cannot be removed at the distal end portion of the operation unit In addition, the connecting portion can be connected by an extremely simple assembly operation, and the connecting portion can obtain structurally excellent strength.

It is an external appearance perspective view of the state in the middle of an assembly of the connection part of the treatment tool for endoscopes concerning the example of the present invention. It is a side view of the biopsy forceps for endoscopes which concerns on the Example of this invention. It is a perspective view which cut | disconnects and shows some biopsy forceps for endoscopes which concern on the Example of this invention. It is a single-piece | unit perspective view of the sheath base end cap used for the connection part of the treatment tool for endoscopes which concerns on the Example of this invention. It is a single-piece | unit perspective view of the modification of the sheath base end cap used for the connection part of the treatment tool for endoscopes which concerns on the Example of this invention. It is an external appearance perspective view of the connection part of the treatment tool for endoscopes which concerns on the Example of this invention. It is side surface sectional drawing of the connection part of the treatment tool for endoscopes which concerns on the Example of this invention. It is VIII-VIII sectional drawing in FIG. 7 of the connection part of the treatment tool for endoscopes which concerns on the Example of this invention. It is a perspective view in the state where the biopsy forceps for endoscopes concerning the example of the present invention were assembled as two units. It is side surface sectional drawing of the state in the middle of the assembly of the connection part of the treatment tool for endoscopes which concerns on the Example of this invention. It is side surface sectional drawing of the state in the middle of the assembly of the connection part of the treatment tool for endoscopes which concerns on the Example of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 2 is a side view of an endoscopic biopsy forceps which is the most typical endoscopic treatment tool. However, the present invention can be applied to various endoscopic treatment tools other than biopsy forceps.

  The flexible sheath 11 that is inserted into and removed from the treatment instrument insertion channel of the endoscope (not shown) is formed of a close-wound coil pipe or a tetrafluoroethylene resin tube, and the diameter thereof is, for example, about 2 mm and long. The length is about 50 cm to 2 m.

  A pair of forceps cups 13 as tip treatment members are provided in a distal end body 12 attached to the distal end of the flexible sheath 11 so as to be openable and closable in a hook shape. The forceps cup 13 can be opened and closed to collect a specimen of living tissue by operating the operation wire 14 inserted and disposed throughout the entire length of the flexible sheath 11 in the axial direction from the proximal end side. Reference numeral 15 denotes an anti-bending member made of a tetrafluoroethylene resin tube or the like for protecting the vicinity of the proximal end of the flexible sheath 11 from being bent suddenly and buckling.

  Reference numeral 20 denotes an operation unit for advancing and retracting the operation wire 14 from the proximal end side. The proximal base end portion of the operation unit main body 21 is provided with a fixed finger hook 22 for engaging the operator's first finger, and a movable finger hook 23 for engaging the second finger and the third finger. It is provided in the part.

  The movable finger hook 23 is connected to the proximal end of the operation wire 14. The movable finger hook 23 is slidably engaged with the operation portion main body 21 along a slit 24 formed in the longitudinal direction of the operation portion main body 21. Yes.

  As a result, by sliding the movable finger hook 23, the operation wire 14 moves forward and backward in the axial direction in the flexible sheath 11, and the forceps cup 13 can be opened and closed remotely. A region near the proximal end of the operation wire 14 located in the operation unit 20 is covered with a reinforcing pipe 14a for preventing hip breakage.

  A retaining tongue 25 for fixing the base end of the flexible sheath 11 so that the base end of the flexible sheath 11 cannot be removed is formed at the distal end portion of the operation portion main body 21 by providing a cut 26 in the operation portion main body 21.

  A pair of retaining tongues 25 are provided at approximately 180 ° symmetrical positions around the axis of the operating portion main body 21 (and therefore approximately 180 ° symmetrical positions around the axis of the base insertion hole 28 described later). However, it is sufficient that at least one retaining tongue 25 is provided.

  FIG. 3 is a perspective view of the endoscopic biopsy forceps shown in FIG. 2, with a part of the operation unit 20 cut away. 17 is a wire base end cap fixed to the base end of the operation wire 14 (that is, the base end of the reinforcing pipe 14a), and is connected to the movable finger hook 23 in a space located in the slit 24 of the operation unit main body 21; It is fixed.

  In the flexible sheath 11, a sheath base end cap 16 fixed to the base end thereof is inserted into a base insertion hole 28 from a distal end opening 28 a formed in the distal end surface of the operation portion main body 21, so The piece 25 is fixed so as not to come out of the base insertion hole 28.

  FIG. 4 shows the sheath base end cap 16 alone. The sheath base end cap 16 of this embodiment is formed in a substantially oval uniform cross-sectional shape in which a side surface at a 180 ° symmetrical position of a cylinder made of a rigid plastic material or metal material is cut off in a flat shape. ing.

  The distal end surface of the sheath base end cap 16 serves as a retaining contact surface 16 a that prevents the sheath base end cap 16 from coming out from the cap insertion hole 28 when connected to the operation portion main body 21. A chamfering 16b (for example, 45 ° chamfering) is formed at the outer edge of the rear end of the sheath base end cap 16 so that the protrusion 27 can be pushed away during insertion into the base insertion hole 28. .

  As shown in FIG. 5, the retaining contact surface 16 a may be formed at an intermediate portion of the sheath base end cap 16. In other words, the retaining contact surface 16 a may be a wall surface facing forward so as to contact a later-described protrusion 27 formed on the inner surface of the retaining tongue piece 25.

  6 and 7 are an enlarged perspective view and a side sectional view showing a portion where the sheath base end cap 16 is connected and fixed to the distal end portion of the operation portion main body 21, and FIG. 8 is a sectional view taken along line VIII-VIII in FIG. It is sectional drawing which expands and shows a cross section.

  As shown in FIG. 7, the base insertion hole 28 is the number of axial lengths of the sheath base end cap 16 from the distal end opening 28 a located on the distal end surface of the operating portion main body 21 to the rear in the operating portion main body 21. A straight line is formed at the axial position of the operation unit main body 21 at a double depth.

  As shown in FIG. 6, the retaining tongue piece 25 is elastically deformed into a state in which the sheath base end cap 16 is pushed to the side by the sheath base end cap 16 when the sheath base end cap 16 is inserted into the base insertion hole 28. In addition, a substantially U-shaped cut 26 is provided on the side wall of the base insertion hole 28 so that only the rear end portion thereof is connected to the side wall of the base insertion hole 28 (that is, the wall portion of the operation unit main body 21). Is formed.

  Further, a protrusion 27 that contacts the retaining contact surface 16a of the sheath base end cap 16 is formed on the inner surface of the distal end of the retaining tongue 25 so as to project inward. Such a retaining tongue piece 25 and the protrusion 27 protruding therefrom can be formed in a large cross-sectional area having sufficient strength.

  Then, when the sheath base end cap 16 is inserted into the cap insertion hole 28 and reaches a predetermined connection position with the operation portion main body 21, the retaining tongue 25 returns to the state before elastic deformation, and FIG. As shown in the above, the protrusion 27 comes into contact with the retaining contact surface 16a of the sheath base end cap 16, and the sheath base end cap 16 is prevented from slipping forward from the cap insertion hole 28.

  In the assembling process, the endoscopic biopsy forceps thus configured includes a flexible sheath side unit 10 and an operation unit 20 for remotely operating the flexible sheath side unit 10 in advance, as shown in FIG. It is assembled as a unit. Finally, the sheath base end cap 16 is connected to the operation portion main body 21 and the wire base end cap 17 is connected to the movable finger hook 23 so that both units are connected.

  When the sheath base end cap 16 is connected to the operation portion main body 21, first, as shown in FIG. 10, the sheath base end cap 16 is inserted into the base insertion hole 28 from the front end opening 28 a. Plugged in.

  As shown in FIG. 11, when the sheath proximal end cap 16 passes through the inner side of the protruding portion 27 that is formed to protrude from the distal end portion of the retaining tongue piece 25, the protruding portion is formed by the sheath proximal end cap 16. 27 is pushed away to the side, and the retaining tongue 25 is elastically deformed into a state where it slightly extends outward.

  FIG. 1 is an external perspective view of this state. The flexible sheath side unit 10 is slid rearward (in the X direction), and the projection 27 is pushed away by the sheath base end cap 16 so as to be removed. The stop tongue piece 25 is elastically deformed laterally (Y direction).

  When the sheath base end cap 16 reaches a position immediately after passing through the inner position of the protrusion 27 (that is, a predetermined connection position with the operation portion main body 21), as described above with reference to FIG. It returns to the state before the retaining tongue 25 is elastically deformed.

  As a result, the projecting portion 27 comes into contact with the retaining contact surface 16a of the sheath base end cap 16, and the sheath base end cap 16 is prevented from slipping forward from the cap insertion hole 28. Connected securely and firmly.

  In this state, the base end face of the sheath base end cap 16 (the end face on the right side in FIG. 7) is in contact with the rear end face wall of the base insertion hole 28, and as shown in FIG. Since the planar side wall surface of the metal 16 is also in a state along the planar side surface of the base insertion hole 28, the sheath base end base 16 is fixed in the base insertion hole 28 without rattling. In this manner, the sheath base end cap 16 is connected and fixed to the operation portion main body 21 so as not to be detached.

  In addition, this invention is not limited to the said Example, For example, as above-mentioned, you may apply this invention to various treatment tools for endoscopes other than the biopsy forceps for endoscopes.

DESCRIPTION OF SYMBOLS 10 Flexible sheath side unit 11 Flexible sheath 16 Sheath base end cap 16a Retaining prevention contact surface 20 Operation part 21 Operation part main body 25 Retaining tongue piece 26 Cut | interrupting 27 Protrusion part 28 Base insertion hole 28a Tip opening

Claims (2)

A connecting portion of an endoscopic treatment tool for connecting the proximal end of the flexible sheath to the distal end portion of the operation portion so as not to be removed;
The base end of the flexible sheath is provided with a sheath base end cap formed with a retaining contact surface facing forward,
A distal end portion of the operation portion includes a base insertion hole into which the sheath base end base is inserted in the axial direction from the front, and the sheath base end opening during the operation in which the sheath base end base is inserted into the base insertion hole. When the sheath base end cap reaches the connecting position with the operation portion, the sheath base end cap returns to the state before the elastic deformation and the sheath base end cap from the inside of the base insertion hole. A retaining tongue that prevents the slipping out is formed on the side wall of the base insertion hole,
The retaining tongue piece is formed by providing a substantially U-shaped cut in the side wall of the base insertion hole in a state where only the rear end portion thereof is connected to the side wall of the base insertion hole. A connecting portion of a treatment instrument for an endoscope, characterized in that a protruding portion that comes into contact with a retaining contact surface of the sheath base end cap is formed inwardly on the inner surface of the distal end of the piece.   The connection part of the treatment tool for endoscopes according to claim 1, wherein a pair of the retaining tongue pieces are provided at approximately 180 ° symmetrical positions around the axis of the mouthpiece insertion hole.

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