JPH05253299A - Syringe for endoscope - Google Patents

Abstract

PURPOSE:To readily curve an outer sheath with a small controlling force by providing at the end side of the outer sheath a curved portion which can be freely curved by means of remote control from the at-hand side of an endoscope, and forming the curved portion in such a manner that it is curved more easily than the other portions of the outer sheath. CONSTITUTION:A liquid feed tube 5 is inserted into an outer sheath 1 in such a manner as to freely move back and forth and a needle 6 is communicatively secured to the end of the liquid feed tube 5 in such a manner as to project from and retreat into the end of the outer sheath 1. An end coil 1a whose rear portion 10 is coarsely wound with intervals is connected by a connecting pipe 4 to the end side of the outer sheath, and the coarsely wound portion is flexible as compared with other portions and is easy to bend, serving as a curved portion 10 which can be freely bent by means of remote control. A curving control portion 20 for curving the curved portion 20 is attached to a main body 2, and a controlling wire 21 moved back and forth by the curving control portion 20 is passed through the outer sheath 1 and is extended to the outside at the connecting pipe 4 located at the end portion of the curved portion 20 and the end of the controlling wire 21 is secured to an end chip 1b located at the end portion of the end coil 1a.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art An endoscope injection device of this type has an injection needle attached to the end of a liquid feeding tube which is inserted into a flexible elongated outer tube made of a tightly wound coil or the like so as to advance and retract.
A syringe is connected to a mouthpiece attached to the proximal side of the liquid feeding tube 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 slip unless it is pierced from the front at an angle close to a right angle to the affected area. Often does not work.

Therefore, a bendable portion is provided at the distal end portion of the mantle tube by a remote operation from the proximal side so that the injection needle can be applied to the affected area from the front even in a narrow lumen portion in the body cavity. It is possible to make it possible to puncture.

However, the mantle tube requires a considerable amount of waist strength, and if it is tried to bend it, the amount of operating force becomes very heavy. Therefore, an object of the present invention is to provide an endoscope injection tool having a bending portion that can be easily bent with a small amount of operation force.

[0006]

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 communicatively connected so as to be able to move in and out from the distal end of the outer tube, a distal end portion of the outer tube is provided with a bendable bending portion by remote control from the proximal side, It is characterized in that the curved portion is formed so as to bend more easily than the portion other than the curved portion of the pipe.

[0007]

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 feed 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 advance and retreat. 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 able to move 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
At the cm portion, as shown in FIG. 1, the tip coil 1a, in which the latter half portion 10 is roughly wound with a gap, is connected to the connecting pipe 4
It is used by being connected by. 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 configured, 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 FIG. 3, the operation wire 21 passing through the outside at the tip coil 1a portion is drawn into the outer tube 1, and the bending portion 10 bends.

At this time, in the bending portion 10, since the coil is roughly wound with a gap, and the waist is weak and it is easy to bend, the bending portion 10 can be easily bent with a small amount of operation force.

Then, when the tip portion of the tip coil 1a faces the target portion of the affected area at an angle close to a right angle, the tightening ring 27 is tightened and the state is locked.

After the lock is completed, the operation tube 9 is pushed into the main body 2. Then, as shown in FIG. 6, the injection needle 6 projects from the tip and is punctured at the target site of the affected area. 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.

When the injection needle 6 is retracted, the tightening ring 27 is loosened to release the lock, and the operation tube 23 is moved forward, the operation wire 21 is pushed in the distal direction, and the bending portion 10 is self-operated. It returns to a straight state by the restoring force.

FIG. 7 shows a second embodiment of the present invention, in which the coil of the bending portion 10 is formed of a tightly wound coil which is different from the tip coil 1a and has a weak stiffness and is easy to bend.
The connecting pipe 40 is connected to the tip coil 1a. The coil of the bending portion 10 may be annealed by heat treatment, one using a soft metal material, one having a small wire diameter, or the like so as to have a weak waist and be easily bent.

FIG. 8 shows a third embodiment of the present invention in which a flexible tube is used for the bending portion 10 instead of the coil. Further, in this embodiment, the bending portion 10
The distal end of the operation wire 21 is fixed to the second connection pipe 40 that connects between the operation wire 21 and the tip coil 1a.
Only the bending portion 10 is surely bent by pulling.

FIG. 9 shows a fourth embodiment of the present invention, in which a plurality of node rings 10a, which are used in a bending portion of an endoscope, are rotatably connected by pins 10b. is there. In this case, the bending portion 10 bends with a very light force. The operation wire 21 is inserted inside the bending portion 10 without being exposed to the outside, and the tip is fixed to the second connecting pipe 40.

As described above, in any of the first to fourth embodiments, the curved portion 10 can be formed so as to be slightly bent more easily than other portions, and the present invention is still another various embodiment. Can be taken.

10 to 13 show a fifth embodiment of the present invention, FIGS. 10 and 11 show a state in which the bending portion 10 is straightened, and FIGS. 12 and 13 show bending the bending portion 10. The state is shown.

In this embodiment, the outer tube 1 is formed by a single coil up to the tip, and only the curved portion 10 is roughly wound. Further, the operation wire 21 is inserted into the outer sheath tube 1 over the entire length without being exposed to the outside of the outer sheath tube 1 even in the bending portion 10, and the tip thereof is fixed to the distal tip 1b. Even with this configuration,
When the operation wire 21 is pulled from the bending operation section 20 side, the bending section 10 bends as shown in FIGS. 12 and 13.

[0029]

According to the endoscope injection tool of the present invention, since the curved portion provided on the distal end side portion of the mantle tube is formed so as to bend more easily than other portions, it is easy to operate with a small amount of operation force. It can be bent and can have excellent operability and excellent durability.

[Brief description of drawings]

FIG. 1 is a side view of a bending portion according to a first embodiment of the present invention.

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

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

FIG. 4 is a front sectional view (IV-IV sectional view) of a hand side portion of the first embodiment of the present invention.

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

FIG. 6 is a schematic view showing a use state of the first embodiment of the present invention.

FIG. 7 is a side view of a bending portion according to a second embodiment of the present invention.

FIG. 8 is a side view of a bending portion according to a third embodiment of the present invention.

FIG. 9 is a side view of a bending portion according to a fourth embodiment of the present invention.

FIG. 10 is a side view of the tip portion of the fifth embodiment of the present invention.

FIG. 11 is a side sectional view of a tip end portion of a fifth embodiment of the present invention.

FIG. 12 is a side view of a bent state of a tip portion of a fifth embodiment of the present invention.

FIG. 13 is a side sectional view of a tip portion of a fifth embodiment of the invention in a bent state.

[Explanation of symbols]

 1 Mantle Tube 1a Tip Coil 5 Liquid Delivery Tube 6 Injection Needle 10 Bending Section 20 Bending Operation Section 21 Operation Wire

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. The distal end portion of the mantle tube is provided with a bending portion that is bendable by remote control from the hand side, and the bending portion is formed to be bent more easily than the portion other than the bending portion of the mantle tube. And an endoscope injection tool.