JPH1015062A - Endoscope injection tool - Google Patents

Abstract

(57) [Problem] To provide an endoscope injection tool which does not have a hard part in an injection needle portion and does not damage other internal components when passing through a treatment tool insertion channel of an endoscope. A mantle tube (11) comprising a tightly wound coil pipe.
And a liquid sending tube 12 made of a flexible and elastic synthetic resin tube which is inserted into the outer tube 11 so as to be able to advance and retreat, and a needle portion formed by cutting off the tip of the liquid sending tube 12. 13 and a liquid inlet 15 provided on the base end side of the liquid feed tube 12 for feeding the liquid into the liquid feed tube 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In general, a syringe for an endoscope is configured such that a liquid feed tube is inserted into a sheath made of a flexible synthetic resin tube or a tightly wound coil so as to be able to advance and retreat, and the liquid feed tube is inserted into the tube. A metal injection needle is connected to the tip.

[0003] By moving the liquid feeding tube forward and backward in the mantle tube by an operation from the hand side, the injection needle is taken out and in from the tip of the mantle tube (Japanese Patent Publication No. 3-2276).
No., Jitsuhei 6-39721).

[0004]

When the injection tool is inserted into the treatment instrument insertion channel of the endoscope, the injection needle is retracted into the outer tube so that the injection needle does not stick into the treatment instrument insertion channel. After the distal end of the instrument has passed through the treatment instrument insertion channel, the injection needle is pushed out of the mantle tube.

However, a metal injection needle is hard to bend and forms a long hard part. Therefore, for example, as shown in FIG. 4, when the injection tool 10 is passed through the treatment tool insertion channel 2 of the endoscope 1, the hard portion is a portion that is bent with a small radius of curvature like the bending portion 3 of the endoscope. A may be stretched straight and damage other built-in components such as the coherent optical fiber bundle 4.

Accordingly, an object of the present invention is to provide an endoscope injector which does not have a hard portion in the injection needle portion and does not damage other internal components when the needle is passed through the treatment instrument insertion channel of the endoscope. I do.

[0007]

In order to achieve the above object, an endoscope injection device according to the present invention comprises an outer tube made of a tightly wound coil pipe, and a flexible tube inserted and retracted into the outer tube. Liquid sending tube made of synthetic resin tube having elasticity and elasticity, a needle portion formed by cutting off the tip of the liquid sending tube, and the liquid sending tube for sending liquid into the liquid sending tube. And a liquid inlet provided on the base end side.

[0008] The needle portion may be formed by squeezing a tip portion of the liquid feed tube thinly and cutting the tip obliquely. Further, a stroke of the proximal portion of the liquid feeding tube with respect to the outer tube may be longer than a stroke of the needle portion with respect to the outer tube.

[0009]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an injection tool 10 for an endoscope, and this injection tool 10 is used by being inserted into a treatment tool insertion channel 2 of an endoscope as shown in FIG.

As shown in FIG. 1, the outermost layer of the injection device 10 is a jacket tube 1 composed of a tightly wound coil pipe formed by tightly winding a stainless steel wire into a coil with a uniform diameter.
1. The mantle tube 11 is tightly wound by applying a so-called preload that applies a crimping force in the axial direction, and is excellent in the linear holding force of the axis.

A liquid supply tube 12 made of a flexible and elastic synthetic resin tube is inserted into the mantle tube 11 so as to be able to advance and retreat. The distal end portion of the liquid supply tube 12 is formed to have a small diameter, and the distal end is cut off obliquely to form the needle portion 13.

As described above, the needle 13 is connected to the liquid sending tube 12.
By making it thinner, the puncture depth with respect to the inner wall of the body cavity is restricted only to the needle portion 13, so that the puncture depth can be made almost as desired. Note that the length and thickness of the needle portion 13 may be set as needed.

As a material for forming the liquid feeding tube 12, for example, nylon (hardness: Rockwell R106-1)
20), polypropylene (hardness: Rockwell R80 ~)
110), polyimide resin (hardness: Rockwell R12)
9) can be used. However, if necessary,
Further, a hard material or a soft material may be used.

At the other end of the inner cylinder 14 connected to the base end of the liquid feeding tube 12, a liquid injection mouth 15 to which a syringe or the like can be connected is formed. The inner cylinder 14 is movable in the axial direction within the outer cylinder 16 connected to the proximal end of the outer tube 11.

An O attached to the inner peripheral side of the outer cylinder 16
The relative positioning between the inner and outer cylinders 14 and 16 is performed by engaging the ring 17 with one of the click grooves 18 and 19 formed at two places on the outer peripheral surface of the inner cylinder 14.

FIG. 1 shows a state in which the O-ring 17 is engaged with the first click groove 18 and the needle portion 13 is housed in the outer tube 11, and is inserted into the treatment instrument insertion channel 2. Removal is performed in this state.

FIG. 2 shows a state in which the O-ring 17 is engaged with the second click groove 19 and the needle portion 13 projects from the distal end of the outer tube 11 by a predetermined length. The injection is performed in this state.

A distal tip 21 made of metal is fixed to the distal end of the outer tube 11. A hole 22 through which the needle portion 13 is loosely inserted is formed at the distal end of the distal end tip 21, and the back side of the hole 22 is formed in a tapered surface that gradually spreads rearward.

The inner diameter of the hole 22 is formed smaller than the outer diameter of the liquid sending tube 12. Therefore, when the liquid feed tube 12 is pushed forward as shown in FIG. 2, the base of the needle portion 13 of the liquid feed tube 12 comes into contact with the tapered surface immediately behind the hole 22 to serve as a stopper.

In this embodiment, the stroke L1 of the needle portion 13 at that time is different from the stroke of the inner tube 14 (that is, the distance between the two click grooves 18, 19).
L2 is slightly longer.

Therefore, even when the endoscope injection device 10 is bent, the liquid feeding tube 12 is pushed out until the base of the needle portion 13 comes into contact with the distal end tip 21, and the needle portion 13 is always kept at a fixed length. Not only can be pushed out, but also when the needle portion 13 is pierced into the affected part,
Is hardly compressed, so that the protruding state of the needle portion 13 is maintained.

The endoscope injection device 10 thus formed
During use, as shown in FIG. 3, is inserted into the treatment tool insertion channel 2 of the endoscope, and passes through a portion of the endoscope that is bent with a small radius of curvature in a curved portion or the like.

However, since the needle portion 13 is made of a synthetic resin having flexibility and elasticity, no hard portion is formed. Therefore, the hard portion A of the endoscope injection tool 10 is only the short distal end tip 21 portion, and even in the curved portion, the treatment instrument insertion channel 2
Inside the treatment instrument insertion channel 2 without damaging other internal components such as an optical fiber bundle (not shown) disposed adjacent to the treatment instrument insertion channel 2.
It can pass through the inside smoothly.

When the distal end of the endoscope injection tool 10 protrudes from the endoscope, the endoscope injection tool 10 formed of a tightly wound coil pipe has a good straight-line holding property, so that the endoscope injection tool 10 can be applied to a target affected area. It can protrude straight toward, and can snipe the affected part accurately.

Then, the needle 13 is punctured into the inner wall of the body cavity,
When the drug solution is sent out from the syringe 20 connected to the liquid inlet port 15 on the hand side, the drug solution is injected into the inner wall of the body cavity through the liquid feeding tube 12.

[0026]

According to the present invention, the needle portion is formed by cutting off the tip of the liquid sending tube made of a synthetic resin tube having flexibility and elasticity, so that a hard portion cannot be formed in the injection needle portion. Therefore, the internal components can be inserted into the treatment tool insertion channel of the endoscope without damage.

[0027] Further, since the mantle tube is formed by the tightly wound coil pipe, the straightness can be maintained well, so that the target affected part can be accurately aimed and injected.

[Brief description of the drawings]

FIG. 1 is a side cross-sectional view of a state in which a needle of an injection tool for an endoscope according to an embodiment of the present invention is retracted.

FIG. 2 is a side sectional view of the endoscope injection tool according to the embodiment of the present invention in a state where a needle is protruded.

FIG. 3 is a partial cross-sectional view showing a state in which the endoscope injection tool according to the embodiment of the present invention passes through a treatment tool insertion channel of the endoscope.

FIG. 4 is a partial cross-sectional view showing a state where a conventional endoscope injection tool passes through a treatment tool insertion channel of the endoscope.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Injection tool for endoscope 11 Mantle tube 12 Liquid feeding tube 13 Needle part 15 Injection port

Claims (3)

[Claims] 1. An outer tube made of a tightly wound coil pipe, a liquid feed tube made of a flexible and resilient synthetic resin tube inserted into the outer tube so as to be able to advance and retreat, and a tip of the liquid feed tube A needle portion formed by cutting off a liquid supply tube, and a liquid inlet provided at a base end side of the liquid supply tube for supplying liquid into the liquid supply tube. Syringe. 2. The endoscope injection device according to claim 1, wherein the needle portion is formed by squeezing a distal end portion of the liquid sending tube and cutting off the distal end obliquely. 3. The endoscope according to claim 1, wherein a stroke of a proximal portion of the liquid feeding tube with respect to the mantle tube is longer than a stroke of the needle portion with respect to the mantle tube. Injection tool.