JPH10211279A - Injector for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of zigzag form in a liquid feed tube, and maintain stable operation force quantity. SOLUTION: A moving range of an operation nozzle 9 is set to be movable forward a position where an injection needle 2 is protruded from a tip of an outer tube 1 to the maximum, and a space 17 where a base end side of the liquid feed tube 3 is flexed to go zigzag is formed in a holding cylinder body 7. As the operation nozzle 9 is moved forward the maximum, the liquid feed tube 3 goes zigzag in the space 17 in the holding cylinder body 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope injection tool used for injecting into a body cavity through a forceps channel of an endoscope.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional endoscope injection instrument. A flexible sheath tube 1 inserted into a forceps channel of an endoscope is, for example, an ethylene tetrafluoride resin tube or It is formed by a stainless steel wire coil pipe or the like.

[0003] In a mantle tube 1, a flexible liquid sending tube 3 made of, for example, a tube made of tetrafluoroethylene resin and provided with an injection needle 2 at the tip is inserted and arranged so as to be able to advance and retreat in the axial direction. I have.

[0004] At the tip of the mantle tube 1, a metal tip cap 4 is provided.
Is fixed, and the injection needle 2 can be protruded and retracted from a hole 4a formed in the center thereof. 5 is an injection needle 2
The stopper is fixed to the rear half portion of the injection needle 2 and restricts the maximum protrusion amount of the injection needle 2 by contacting the distal end base 4.

[0005] To the proximal end of the mantle tube 1 is connected a gripping cylinder 7 which is gripped by a fingertip when the injection needle 2 is pushed and retracted. Numeral 8 denotes a buckling prevention coil for preventing bending near the base end of the mantle tube 1.

Reference numeral 9 denotes an operation base for operating the injection needle 2 to protrude and retract, and can be pushed into the gripping cylinder 7 from the hand side. At the proximal end of the operation base 9,
An injection cylinder receiving base 10 is formed.

A long and thin tube connecting portion 9a reaching the entrance of the mantle tube 1 is formed on the front side of the operation base 9, and the base end portion of the liquid feed tube 3 is fitted and connected to the portion 9a. ing.

[0008] A circumferential groove 11 is formed in the inner peripheral surface of the gripping cylinder 7 near the proximal side of the mouth, into which an O-ring 12 made of a resilient material made of rubber or synthetic resin is fitted. ing.

A front engagement groove 14 and a rear engagement groove 15 for engaging with the O-ring 12 are formed on the outer peripheral surface of the operation base 9 fitted on the inner peripheral surface of the gripping cylinder 7 in the axial direction. Are formed at intervals.

In the thus configured endoscope injection device, the operation base connected to the base end of the liquid feed tube 3 is held by holding the holding cylinder 7 connected to the base end of the mantle tube 1. The needle 2 can be made to protrude and retract from the distal end of the mantle tube 1 by operating the needle 9 in the axial direction.

The operation stroke of the operation base 9 at the time of the operation is the distance B between the front engagement groove 14 and the rear engagement groove 15.
In this case, B is set to be larger than the movement stroke A of the injection needle 2.

Therefore, as shown in FIG. 4, when the operation base 9 is pushed into the holding cylinder 7 from the state in which the injection needle 2 is retracted into the outer tube 1, the injection needle 2 is made to protrude to the maximum. The operation base 9 is further pushed into the gripping cylinder 7 from the position where the rear engagement groove 15 is formed as shown in FIG.
Is engaged with the O-ring 12, and the operation base 9 is locked to the gripping cylinder 7.

Therefore, as shown in FIG. 5, when the stopper 5 collides with the distal end base 4 and the injection needle 2 is maximally protruded, a force for compressing the liquid feeding tube 3 in the axial direction is applied to the liquid feeding tube 3. It has joined over the entire length.

[0014]

As described above, applying a compressive force in the axial direction to the liquid feeding tube 3 in a state where the injection needle 2 is protruded to the maximum is necessary to move the injection needle 2 to the affected part. It is necessary to prevent the injection needle 2 from being pushed back when piercing.

In order to make the injection needle 2 protrude as much as possible when the outer tube 1 is bent, the operation stroke B of the operation base 9 is more than the movement stroke A of the injection needle 2.
Need to be large.

However, in the conventional endoscope injector having the above-described structure, the liquid feeding tube 3 to which the compressive force is applied bends over the entire length in the outer tube 1 having only a small clearance. .

As a result, the liquid feeding tube 3 may have a meandering habit over the entire length in the mantle tube 1 and may not be operated smoothly. Further, when the mantle tube 1 is straight, the stroke difference (BA) becomes large, so that the compressive force applied to the liquid feed tube 3 becomes considerably large, and the pushing operation of the operation base 9 becomes very heavy. In some cases, operability was impaired.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an endoscope injector which does not have a meandering habit in a liquid feeding tube and can maintain a stable operation force.

[0019]

In order to achieve the above-mentioned object, an endoscope injection device of the present invention comprises a flexible liquid feeding tube provided with an injection needle at the tip thereof, which is capable of moving forward and backward in the axial direction. It was inserted through the flexible mantle tube, and the base end portion of the liquid feed tube was passed through the holding cylinder connected to the base end of the mantle tube, and connected to the base end of the liquid feed tube. An endoscope in which the operation mouthpiece is moved in the axial direction with respect to the gripping cylinder so that the liquid feeding tube advances and retreats in the outer tube and the injection needle protrudes and retracts from the tip of the outer tube. In the syringe for use, the movement range of the operation mouthpiece can be moved further forward than a position where the injection needle projects to the maximum from the distal end of the mantle tube, and a portion on the base end side of the liquid feeding tube. A space for bending and meandering is formed in the gripping cylinder. And, the operation cap when moving to the front side to maximize characterized in that the liquid supply tube was made to meander in the space within the grip tube.

It is preferable that a portion of the liquid sending tube located in the space inside the holding cylinder has greater flexibility than other portions, and the liquid feeding tube is located in the space inside the holding cylinder. In the portion to be bent, a waist break prevention member for preventing the liquid feed tube from breaking waist may be provided.

In this case, a spiral groove may be formed on the outer periphery of the liquid feed tube in a portion located in the space inside the holding cylinder, and a coil member may be wound along the spiral groove.

Further, it is preferable that the liquid feeding tube has a repulsive force of 80 g or more in the axial direction toward the front side when the liquid feeding tube is meandering in the holding cylinder.

[0023]

Embodiments of the present invention will be described with reference to the drawings. FIG. 2 shows an injection tool for an endoscope to which the present invention is applied. A flexible outer tube 1 inserted into a forceps channel of the endoscope is, for example, a tetrafluoroethylene resin tube or a stainless steel tube. It is formed by a steel wire coil pipe or the like.

In the mantle tube 1, a flexible liquid feed tube, for example, made of a tube made of tetrafluoroethylene resin, provided with an injection needle 2 at the tip, is inserted and arranged so as to be able to advance and retreat in the axial direction. .

At the tip of the mantle tube 1, a metal tip cap 4 is provided.
Is fixed, and the injection needle 2 can be protruded and retracted from a hole 4a formed in the center thereof. 5 is an injection needle 2
The stopper is fixed to the rear half portion of the injection needle 2 and restricts the maximum protrusion amount of the injection needle 2 by contacting the distal end base 4.

A gripping cylinder 7 that is gripped by a fingertip when the injection needle 2 is pushed and retracted is connected to the proximal end of the outer tube 1. Numeral 8 denotes a buckling prevention coil for preventing bending near the base end of the mantle tube 1.

Reference numeral 9 denotes an operation base for operating the injection needle 2 to protrude and retract, and can be pushed into the gripping cylinder 7 from the hand side. At the proximal end of the operation base 9,
An injection cylinder receiving base 10 is formed.

The proximal end of the liquid feed tube 3 is connected to the distal end 9a of the operation base 9 located inside the operation base 9. In addition, on the inner peripheral surface near the proximal end of the gripping cylinder 7,
A circumferential groove 11 is formed in which an O-ring 12 made of a resilient material made of rubber or synthetic resin is fitted.

A front engagement groove 14 and a rear engagement groove 15 which engage with the O-ring 12 are formed on the outer peripheral surface of the operation base 9 which is fitted on the inner peripheral surface of the gripping cylinder 7 in the axial direction. Are formed at intervals.

The O-ring 12 and the engaging grooves 14 and 15 have a so-called click function. When the O-ring 12 engages with any one of the engaging grooves 14 and 15, the operation base 9 is brought into contact with the gripping cylinder 7. To be in a state of being elastically locked.

In the endoscope injection device thus configured, an operation base connected to the base end of the liquid feed tube 3 is held by holding the holding cylinder 7 connected to the base end of the mantle tube 1. The needle 2 can be made to protrude and retract from the distal end of the mantle tube 1 by operating the needle 9 in the axial direction.

The operation stroke of the operation base 9 at the time of the operation is the distance B between the front engagement groove 14 and the rear engagement groove 15.
In this case, B is set to be larger than the movement stroke A of the injection needle 2.

Therefore, as shown in FIG. 2, when the operation base 9 is pushed into the holding cylinder 7 from the state where the injection needle 2 is retracted into the outer tube 1, the injection needle 2 is made to protrude to the maximum. The operation base 9 is further pushed into the gripping cylinder 7 from the position where the rear engagement groove 15 is formed as shown in FIG.
Is engaged with the O-ring 12, and the operation base 9 is locked to the gripping cylinder 7.

Therefore, as shown in FIG. 1, when the stopper 5 hits the distal end base 4 and the injection needle 2 is maximally protruded, a force for compressing the liquid feeding tube 3 in the axial direction is applied to the liquid feeding tube 3. It has joined over the entire length.

Therefore, in this embodiment, when a compressive force is applied to the liquid feed tube 3 in the axial direction, the base portion of the liquid feed tube 3 largely bends and the space 17 for meandering is formed by the holding tube. It is formed in the body 7.

A spiral groove 18 as shown in FIG. 3 in an enlarged manner is formed in a portion of the liquid sending tube 3 located in the space 17 over the entire area thereof. A coil 19 made of, for example, a stainless steel wire is wound along the spiral groove 18.

With the spiral groove 18 formed as described above, the liquid sending tube 3 is more flexible (ie, more flexible) in a portion located in the space 17 than in other portions. It's easier. The coil 19 prevents the hip from being bent when bent.

In the endoscope injection device of the embodiment configured as described above, as shown in FIG. 1, the stopper 5 comes into contact with the distal end base 4 and the injection needle 2 projects to the maximum. Then, the base end portion of the liquid sending tube 3 is
And meanders in the space 17 inside. Then, when the operation base 9 is pulled back, as shown in FIG. 2, the elasticity of the coil 19 returns the liquid feed tube 3 to its original straight state.

Therefore, the liquid feeding tube 3 hardly has a meandering habit, and the liquid feeding tube 3 in the space 17 of the gripping cylinder 7 is large in flexibility and flexible. There is no need for a large amount of operation force when pushing.

In general, a force of about 40 to 80 g is required to puncture the injection needle 2 into the affected part, so that the base end side of the liquid feeding tube 3 is bent in the space 17 as shown in FIG. Each part may be set so that the axial repulsion F from the bent portion toward the needle tip is 80 g or more.

[0041]

According to the present invention, the moving range of the operation mouthpiece can be moved further forward than the position where the injection needle projects to the maximum from the distal end of the mantle tube, and the proximal end of the liquid feeding tube can be moved. By forming a space for bending and meandering in the holding cylinder body, the liquid sending tube meanders in the space in the holding cylinder body when the operation base is moved to the front side to the maximum. There is no meandering habit in the liquid sending tube,
In addition, it is possible to maintain a stable operation force amount that does not become too heavy for the operation of pushing the operation base.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an endoscope injection tool according to an embodiment of the present invention in a state where an injection needle is projected.

FIG. 2 is a side sectional view showing a state in which the injection needle of the injection tool for an endoscope according to the embodiment of the present invention is retracted.

FIG. 3 is an enlarged cross-sectional view of a portion on the base end side of the liquid feeding tube according to the embodiment of the present invention.

FIG. 4 is a side cross-sectional view of a conventional endoscope injection tool in a state where an injection needle is retracted.

FIG. 5 is a side cross-sectional view of a conventional endoscope injection tool with an injection needle protruding.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer tube 2 Injection needle 3 Liquid sending tube 7 Grasping cylinder 9 Operation base 17 Space 18 Spiral groove 19 Coil

Claims (5)

[Claims] A flexible liquid feeding tube provided with an injection needle at a distal end thereof is inserted and arranged in a flexible mantle tube so as to be able to advance and retreat in the axial direction, and a base end portion of the liquid feeding tube is arranged. The liquid feeding tube is passed through the gripping cylinder connected to the proximal end of the mantle tube, and the operation mouthpiece connected to the proximal end of the liquid feeding tube is moved in the axial direction with respect to the gripping cylinder. In the endoscope injection tool in which the injection needle advances and retreats in the mantle tube so that the injection needle protrudes and retracts from the tip of the mantle tube, the moving range of the operation base is adjusted by moving the injection needle from the tip of the mantle tube In addition to allowing the tip to be moved further forward than the position at which it protrudes to the maximum, a space for the base end portion of the liquid feed tube to bend and meander is formed in the gripping cylinder so that the operation base is maximized. When it is moved to the front side An endoscope injection device characterized in that the valve is meandered in the space inside the gripping cylinder. 2. The endoscope injection device according to claim 1, wherein a portion of the liquid supply tube located in the space inside the holding cylinder has greater flexibility than other portions. 3. The endoscope injection device according to claim 1, wherein a waist break prevention member for preventing the waist break of the liquid feeding tube is provided at a portion located in the space in the gripping cylinder body. . 4. A spiral groove is formed on the outer periphery of said liquid feed tube in a portion located in the space inside said gripping cylinder, and a coil member is wound along said spiral groove. Endoscope injection tool. 5. In a state where the liquid feeding tube is meandering in the gripping cylinder, 80 g in the axial direction toward the front side.
The injection device for an endoscope according to claim 1, 2, 3, or 4, which has the above repulsive force.