JPH05253178A - Injection means for endoscope - Google Patents

Abstract

PURPOSE:To provide the injection means for an endoscope which can surely puncture an injection means needle into a lesion when this needle is projected from a top end in the state of curving a curving part. CONSTITUTION:The curving part 10 which can be curved by a remote operation from the operator side is formed in the part on the front end side of a sheath pipe 1 and the height (h) of the curving part from the pipe axis A of the sheath pipe A when the curving part 10 is bent nearly at a right angle is set at nearly the same size as the inside diameter (d) of the vascular cavity in the part to be injected.

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 for inserting a forceps channel of an endoscope to inject a lumen portion in a body cavity.

[0002]

2. Description of the Related Art An endoscope injection instrument of this type is mounted on the proximal side of the liquid feeding tube by attaching an injection needle to the tip of the liquid feeding tube which is inserted in a flexible elongated outer tube so as to be able to move forward and backward. A syringe is connected to the mouthpiece so that the liquid medicine can be delivered from the syringe to the injection needle.

[0003]

When the injection needle of such an endoscope injection tool is pierced into the affected area, the needle tip will not slide unless it is pierced from the front at an angle substantially perpendicular to the affected area. In many cases.

Therefore, a curved portion which can be bent by a remote operation from the proximal side is formed at the distal end portion of the mantle tube, and the curved portion is bent substantially at a right angle to the affected portion in the lumen portion. It is considered that the puncture can be performed almost from the front.

However, simply forming a curved portion at the distal end of the mantle tube to bend it causes the height h of the bent portion of the mantle tube 1 with respect to the tube axis A to be affected as shown in FIG. If it is smaller than the inner diameter d of the lumen,
I can't puncture well.

That is, when the injection needle is projected from the tip of the mantle tube under such an environment, as shown in FIG. 9, after the tip of the needle 6 hits the affected part 100, the mantle tube 1 is left in the space part. It cannot be pierced by the injection needle 6 into the affected area because the injection needle 6 simply slides backward.

[0007] Therefore, an object of the present invention is to provide an endoscope injection tool which can surely puncture an affected part when an injection needle is projected from the tip end in a state where a curved part is bent.

[0008]

In order to achieve the above-mentioned object, an endoscope injection tool of the present invention is provided with a distal end of a liquid feeding tube that is inserted into a flexible elongated outer tube so as to be able to advance and retract.
In an endoscope injection tool in which an injection needle is connected for communication in and out from the tip of the mantle tube, a bending portion that can be bent by remote operation from the proximal side is formed in a portion on the tip side of the mantle tube, The height of the bent portion with respect to the tube axis of the mantle tube when the curved portion is bent substantially at a right angle is set to be substantially the same as the inner diameter of the lumen of the injection target portion.

[0009]

Embodiments will be described with reference to the drawings. FIG. 2 shows an injection tool for an endoscope. In FIG.
It is a flexible, slender outer tube consisting of a tightly wound coil with a length of 1.5 mm and a length of about 1.5 m.

A tubular body 2 is coaxially connected to the outer tube 1 on the proximal side of the outer tube 1. Reference numeral 3 is a bend prevention coil attached to the outside of the outer tube 1 so that the outer tube 1 does not bend near the connection portion with the main body 2.

A liquid feeding tube 5 made of a fluororesin tube or the like is inserted into the outer tube 1 so as to extend and retract over substantially the entire length. An injection needle 6 is fixedly connected to the distal end of the liquid supply tube 5 so as to be able to move in and out from the distal end of the outer tube 1.

A syringe connection mouthpiece 8 is fixed to the proximal side of the liquid feeding tube 5 so as to project from the proximal side of the main body 2 so as to be movable back and forth. Further, a cylindrical operation tube 9 surrounding the vicinity of the proximal end of the liquid supply tube 5 is fixed to the syringe connection mouthpiece 8 so that the liquid supply tube 5 can be moved back and forth in the axial direction without bending.

The operation tube 9 is fitted in the main body 2 so as to be movable back and forth. Therefore, the operating tube 9 can be moved forward and backward in the axial direction by pinching it with a fingertip, and when the operating tube 9 is pushed into the main body 2, the injection needle 6 projects from the tip, and as shown in FIG. When the needle is pulled out from the main body 2, the injection needle 6 is pulled into the tip of the outer tube 1.

For example, lengths 1 to 3 on the tip side of the outer tube 1
A tip coil 1a, in which the latter half portion 10 is roughly wound with a gap, is connected to the cm portion by a connecting pipe 4 and is used. The coarsely wound portion has a lower waist than other portions and is easily bent, and is a bendable portion that can be bent by remote control. Hereinafter, this portion is referred to as the bending portion 10.

A bending operation portion 20 for bending the bending portion 10 is attached to the main body 2, and an operation wire 21 operated to move back and forth by the bending operation portion 20 passes through the outer tube 1 and the base portion of the bending portion 10. The connection wire 4 is pulled out to the outside, and the tip of the operation wire 21 is fixed to the tip 1b attached to the tip of the tip coil 1a.

FIG. 3 shows the structure of the bending operation section 20, and 23 is an operation tube which is movably fitted to the outer peripheral surface of the main body 2. A wire stopper pin 24 for locking the proximal end portion of the operation wire 21 to the operation tube 23 is loosely fitted in an elongated hole 25 formed in the main body 2 in the axial direction. Therefore, the operation tube 23 can be moved only in the axial direction of the main body 2, and the movement range thereof is such that the wire stop pin 24 has the long hole 25.
It is a length that can be moved within.

The operating cylinder 23, as shown in FIG.
The part on the hand side is divided from the end side by four slits. Then, the tapered surface 26 that abuts on the end portion
A tightening ring 27 formed with is screwed into the operating cylinder 23.

Therefore, the operating cylinder 23 can slide along the axial direction of the main body 2 when the tightening ring 27 is loosened. The quartered portion is pressed against the surface of the main body 2 by the tapered surface 26 of the tightening ring 27, and the operation tube 23
Is locked so that you cannot slide.

Reference numeral 12 is a joint pipe for connecting the liquid feeding tube 5 and the syringe connection mouthpiece 8. 13 is a control tube 9
O to play the role of a click that lightly locks the movement of
A ring that is a ring and is attached to the mouth of the body 2
5 is attached by means of a tightening nut 14.

According to the endoscope injection tool of the embodiment thus constructed, the operation wire 21 is pulled by sliding the operation tube 23 toward the hand side (right side in FIG. 3), and the operation wire 21 is pulled. As shown in, the operating wire 21 passing through the outside at the bending portion 10 is drawn into the outer tube 1, and the bending portion 10 is bent to a substantially right angle.

In FIG. 1, an endoscope 200 is inserted into a lumen portion of a body cavity, a tip portion of an endoscope injection tool is projected from the tip thereof, and a bending portion 10 thereof is bent substantially at a right angle. The state is shown, and the height h of the bent portion of the outer tube 1 with respect to the tube axis A is h.
Is set to have substantially the same size as the inner diameter d of the injection target portion.

In actual use, as shown in FIG. 6, the tip of the injection tool is projected from the distal end of the endoscope 200 in a state where the bending portion 10 is straightened, and then as shown in FIG. When 10 is bent at a right angle, tightening ring 27
Tighten to lock the state.

After the lock is completed, the operation tube 9 is pushed into the main body 2. Then, the injection needle 6 projects from the tip and hits the affected area 100 on the surface of the lumen. If the injection needle 6 is further projected as it is, the mantle tube 1 collides with the inner wall of the lumen opposite to the affected part 100, and there is no escape backward.
The injection needle 6 is smoothly punctured into the affected area as shown in FIG. Finally, if the drug solution is injected from a syringe (not shown) connected to the syringe connection base 8, the injection of the drug solution to the target site is completed.

After the injection is completed, the injection needle 6 is retracted, the tightening ring 27 is loosened to release the lock, and the operation tube 23 is moved forward. 10 returns to a straight state by its own restoring force.

The bending height h of the bending portion 10 is set according to the inner diameter d of the lumen to be used.

[0026]

According to the injection device for an endoscope of the present invention, when the injection needle is projected from the distal end of the injection tube while the curved portion of the distal end is bent substantially at a right angle, the mantle tube is opposite to the injection target part. Since there is no escape area by colliding with the inner wall of the lumen at the side position, the injection needle can be smoothly and accurately punctured into the affected area to be injected.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention in use.

FIG. 2 is a side view of an embodiment of the present invention.

FIG. 3 is a side sectional view of a hand side portion of the embodiment of the present invention.

FIG. 4 is a front cross-sectional view (IV
-IV sectional view).

FIG. 5 is a side view of a curved state of the embodiment of the present invention.

FIG. 6 is a side view of an embodiment of the present invention in use.

FIG. 7 is a side view of the use state in which the injection needle of the embodiment of the invention is projected.

FIG. 8 is a side view of a conventional example in use.

FIG. 9 is a side view of a conventional state in which the injection needle of the conventional example is protruded.

[Explanation of symbols]

 1 mantle tube 5 liquid feeding tube 6 injection needle 10 bending part 20 bending operation part 21 operation wire A tube axis h bent portion height d lumen inner diameter

Claims (1)

[Claims] 1. An endoscope injection tool in which an injection needle is connected to the tip of a liquid feed tube that is inserted into and retracted from a flexible elongated outer tube so that the injection needle can freely move in and out from the tip of the outer tube. A bent portion that can be bent by remote operation from the proximal side is formed in a portion on the distal end side of the mantle tube, and the bent portion with respect to the tube axis of the mantle tube when the bent portion is bent at a substantially right angle. The height is set to be approximately the same as the inner diameter of the lumen of the injection target part.