JPH08336591A - Injection means for endoscope - Google Patents

Abstract

PURPOSE: To provide an injection means for an endoscope which eliminates the possibility of pricking of an injection needle into a sheath tube and may be easily assembled. CONSTITUTION: This injection means has the sheath tube 11 consisting of a tube made of a synthetic resin having flexibility, a liquid feed tube 12 consisting of a tube which is made of a synthetic resin having flexibility and elasticity and is freely advanceably and retreatably inserted into the sheath tube 11, a needle part 13 formed by diagonally cutting the front end of the liquid feed tube 12 and a liquid injection port 15 disposed 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 endoscope injection instrument for injecting into a body cavity of a patient via a treatment instrument insertion channel of the endoscope.

[0002]

2. Description of the Related Art Generally, an injection device for an endoscope is configured such that a liquid feeding tube is inserted into a mantle tube made of a flexible synthetic resin tube so that the liquid feeding tube can advance and retreat, and the tip of the liquid feeding tube is made of metal. An injection needle is connected, and the injection needle is taken in and out from the tip of the outer tube by advancing and retracting the liquid feeding tube in the outer tube by an operation from the hand side.

[0003]

When the injection instrument is inserted into the treatment instrument insertion channel of the endoscope, the injection needle is retracted into the outer tube so as not to be pierced by the treatment instrument insertion channel. The needle is pushed out of the mantle tube after the distal end of the needle passes through the treatment instrument insertion channel.

However, as shown in FIG. 16, when the injection needle 13 is pushed out in a state where the tip of the injection needle 13 is located on the outer peripheral side of the bend of the outer tube 11, the injection needle 13 causes the outer needle 11 to move. You may get stuck in.

Therefore, the outer tube 11 and the liquid feeding tube 12 are assembled so that the bending tendency of the outer tube 11 and the bending tendency of the liquid feeding tube 12 correspond to each other, and the needle tip of the injection needle 13 is always positioned on the inner peripheral side of the bending of the outer tube 11. The method is taken.

However, such an assembly is very troublesome, and the bending tendency of the outer tube 11 and the liquid feeding tube 12 often changes depending on the use, so that the needle tip of the injection needle 13 is eventually changed to the outer tube. In many cases, the injection needle 13 was pierced and damaged by the outer tube 11 when it was positioned on the outer peripheral side of the bend of the tube 11.

[0007] Therefore, an object of the present invention is to provide an endoscope injection tool which can be easily assembled without the risk of the injection needle sticking into the outer tube.

[0008]

In order to achieve the above object, the endoscope injection tool of the present invention has an outer tube made of a flexible synthetic resin tube, and is retractable in the outer tube. A liquid-feeding tube made of a flexible and elastic synthetic resin tube that is inserted into the needle, a needle portion formed by cutting the tip of the liquid-feeding tube diagonally, and a liquid in the liquid-feeding tube. It has a liquid injection port provided on the proximal end side of the liquid feeding tube for feeding.

The hardness of the liquid feeding tube may be higher than the hardness of the outer tube, and puncture depth regulating means for regulating the puncture depth of the needle portion is provided from the outer peripheral surface of the liquid feeding tube. It may be provided so as to project.

[0010]

Embodiments will be described with reference to the drawings. Figure 1
1 shows an endoscope injection tool 10 according to a first embodiment of the present invention, which is inserted into a treatment tool insertion channel 2 of an endoscope 1 as shown in FIG. used.

As shown in FIG. 1, an injection device 10 includes a mantle tube 11 made of a flexible synthetic resin tube and a liquid delivery made of a flexible and elastic synthetic resin tube. The tube 12 is inserted so that it can move back and forth, and the needle portion 13 is formed by cutting the tip of the liquid feeding tube 12 obliquely.

On the other end side of the inner cylinder 14 connected to the base end of the liquid supply tube 12, a liquid injection mouthpiece 15 to which a syringe or the like can be connected is formed. The inner cylinder 14 is axially movable back and forth within an outer cylinder 16 connected to the base end of the outer tube 11.

The O attached to the inner peripheral side of the outer cylinder 16
The ring 17 engages with one of the click grooves 18 and 19 formed at two positions on the outer peripheral surface of the inner cylinder 14 to perform relative positioning between the inner and outer cylinders 14 and 16.

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. Detachment 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 protrudes from the distal end of the outer tube 11 by a predetermined length. The injection is performed in this state.

The injection device 10 thus formed is shown in FIG.
As shown in FIG. 1, the treatment instrument insertion channel 2 of the endoscope 1
The needle portion 13 is pierced into the inner wall of the body cavity, and the medicinal solution delivered from the syringe 20 connected to the liquid injection mouthpiece 15 on the hand side is injected into the inner wall of the body cavity through the liquid delivery tube 12.

As the material of the outer tube 11, low density polyethylene (hardness: Shore D41 to 50), high density polyethylene (hardness: Shore D60 to 70), tetrafluoroethylene (PFA) (hardness: Shore D60 to 64). , Polytetrafluoroethylene (PTFE) (Hardness: Shore D
50-56) etc. can be used.

Since the liquid delivery tube 12 has a needle portion 13 whose tip is pierced into the wall of the body cavity, it must have a certain hardness or more. Therefore, as a material for forming the liquid feeding tube 12, for example, nylon (hardness: Rockwell R10
6-120), polypropylene (hardness: Rockwell R
80 to 110), a polyimide resin (hardness: Rockwell R129), and the like can be used. However, if necessary, a harder material or a softer material may be used.

By the way, the liquid feeding tube 12 is replaced with the outer tube 11.
As it is pushed inside, as shown in FIG.
If the needle tip is bent so as to be located on the inner peripheral side of the bend of the outer tube 11, there is no risk of the needle tip sticking into the outer tube 11.

When the needle portion 13 has passed through the outer tube 11, the liquid feeding tube 12 has elasticity,
The vicinity of the needle portion 13 returns to the original straight state, and the inner wall of the body cavity can be punctured.

On the other hand, as shown in FIG. 5, when the needle tip of the needle portion 13 is located on the outer peripheral side of the curve of the outer tube 11, the needle portion 13 sticks into the outer tube 11 depending on the conditions. It is thought that there is a possibility that

Therefore, if a synthetic resin whose hardness is equal to or lower than the hardness of the outer tube 11 is selected as the material for forming the liquid feeding tube 12, there is no possibility that the needle portion 13 will pierce the outer tube 11.

However, the liquid feeding tube 12 is not necessarily made of a material having a hardness lower than that of the outer tube 11. According to the result of the experiment, for example, the polyimide resin of Rockwell R129 having a hardness obviously higher than that of the outer tube 11 could be used without any problem.

FIG. 6 shows the experimental conditions, in which the outer tube 11 made of tetrafluoroethylene (PFA) (hardness: Shore D64) has a curvature corresponding to a bent state when used in various endoscopes. Bend at a radius and pass through it the polyimide liquid transfer tube 12 having a hardness of Rockwell R129,
It was judged whether or not the vehicle could pass without hindrance. In all cases, the needle tip of the needle portion 13 of the liquid feeding tube 12 was positioned on the outer peripheral side of the bend.

In FIG. 7, the inner and outer diameters (diameter) are 2.2 mm /
Inside the outer tube 11 of 2.8 mm, the inner and outer diameter (diameter) is 0.7
The experimental results are shown when the liquid feeding tube 12 of mm / 1.25 mm is passed through, and in all cases, the needle portion 13 has passed through the outer tube 11 without being pierced.

In FIG. 8, the inner and outer diameters (diameter) are 1.2 mm /
Inside the outer tube 11 of 1.7 mm, the inner and outer diameter (diameter) is 0.7
The experimental results when the liquid feeding tube 12 of mm / 1.0 mm is passed through are shown. Also in this case, the needle portion 1 is used in all cases.
3 passed through the mantle tube 11 without being pierced.

Thus, even if the liquid feeding tube 12 made of a material harder than the outer tube 11 is inserted into the outer tube 11 so that the needle section 13 is on the outer peripheral side of the bend, the needle section 13 It is thought that the fact that the stab does not penetrate the outer tube 11 is due to the difference in rigidity between the outer tube 11 and the liquid feeding tube 12, the sliding friction resistance, and the like.

9 and 10 show a second embodiment of the present invention in which the diameter of the tip portion 12a of the liquid feeding tube 12 is formed thin. When formed in this way, as shown in FIG. 11, the needle portion 13 becomes flexible and easily follows the bend of the outer tube 11, and the puncture depth for the inner wall of the body cavity is restricted to only the small diameter portion 12a. Therefore, the puncture depth can be made almost as desired. The length and thickness of the small diameter portion 12a may be set as needed.

FIG. 12 shows a third embodiment of the present invention in which a cylindrical projection 21 for regulating the puncture depth is fixed near the needle portion 13 of the liquid feeding tube 12. .
Further, FIG. 13 shows a protrusion 22 for regulating the puncture depth.
Is a fourth embodiment formed by heating and deforming the liquid feeding tube 12 itself, and as shown in FIGS. 14 and 15, the number of the projections 22 may be two or three or more.

[0030]

According to the present invention, the needle portion is formed by obliquely cutting the tip of a liquid-feeding tube made of a flexible and elastic synthetic resin tube which is inserted into the outer tube so as to be able to move forward and backward. As a result, since the needle portion can flexibly bend along the outer tube, there is no fear of being stuck into the outer tube,
Moreover, it can be assembled very easily.

Further, if the puncture depth regulating means for regulating the puncture depth of the needle portion is provided, the puncture depth to the inner wall of the body cavity can be regulated as desired.

[Brief description of drawings]

FIG. 1 is a side sectional view of an endoscope injection tool of a first embodiment.

FIG. 2 is a side cross-sectional view of the first embodiment of the endoscope injection tool with a needle protruding.

FIG. 3 is a side view of the use state of the first embodiment.

FIG. 4 is a side partial cross-sectional view for explaining the operation of the endoscope injection tool according to the first embodiment.

FIG. 5 is a side surface partial cross-sectional view for explaining the operation of the endoscope injection tool of the first embodiment.

FIG. 6 is a side sectional view showing a state of an experiment of inserting the needle portion into the mantle tube of the first embodiment.

FIG. 7 is a chart showing conditions and results of an experiment of inserting a needle portion into the mantle tube of the first embodiment.

FIG. 8 is a chart showing conditions and results of an experiment of inserting a needle portion into the mantle tube of the first embodiment.

FIG. 9 is a side sectional view of an endoscope injection tool of a second embodiment.

FIG. 10 is a side sectional view showing a state where a needle portion of the endoscope injection tool of the second embodiment is projected.

FIG. 11 is a side surface partial cross-sectional view for explaining the operation of the endoscope injection tool according to the second embodiment.

FIG. 12 is a side partial cross-sectional view of an endoscope injection tool according to a third embodiment.

FIG. 13 is a side partial cross-sectional view of the endoscope injection tool of the fourth embodiment.

FIG. 14 is a front sectional view of an endoscope injection tool of a fourth embodiment.

FIG. 15 is a front cross-sectional view of a modified example of the endoscope injection tool of the fourth embodiment.

FIG. 16 is a side surface partial cross-sectional view for explaining the operation of the conventional endoscope injection tool.

[Explanation of symbols]

 10 Injection Tool 11 Outer Tube 12 Liquid Delivery Tube 13 Needle 15 Liquid Injector

Claims (3)

[Claims] 1. An outer tube made of a flexible synthetic resin tube, and a liquid feed tube made of a flexible and elastic synthetic resin tube inserted into the outer tube so as to be able to move forward and backward. It has a needle portion formed by cutting the tip of the liquid feeding tube diagonally, and a liquid injection port provided on the proximal end side of the liquid feeding tube for feeding a liquid into the liquid feeding tube. A characteristic endoscope injection tool. 2. The endoscope injection instrument according to claim 1, wherein the liquid supply tube has a hardness higher than that of the outer tube. 3. The endoscope injection according to claim 1, wherein a puncture depth regulating means for regulating the puncture depth of the needle portion is provided so as to project from the outer peripheral surface of the liquid feeding tube. Ingredient