JPH05261063A - Injection means for endoscope - Google Patents

Abstract

PURPOSE:To provide the injection means for an endoscope which is simple in construction and can be surely bent in the part on its front end side without generating an operation defect. CONSTITUTION:This injection means for the endoscope is constituted by communicating and connecting an injection needle, freely insertably and removably into and from a flexible and slender sheath pipe 1 from its front end, with and to the front end of a liquid feed tube inserted freely movably forward and backward into the sheath pipe 1. The part 1a on the front end side of the sheath pipe 1 is previously formed to a curved shape. The state in which the part 1a on the front end side of the sheath pipe 1 is housed into a sleeve 11 and is straightened and the state in which the part 1a on the front end side of the sheath pipe 1 is emerged from the sleeve 11 and restores the original curved shaped are changed over by moving the straight sleeve 11 disposed to enclose the circumference of the above-mentioned part forward and backward from an operator side.

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 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 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, it is conceivable to form a bendable bendable portion by remote control at the tip end side of the mantle tube, and bend the bendable portion by pulling the operation wire from the proximal operation portion. .. By doing so, it is possible to puncture the affected area from the front.

However, such a bending mechanism has a complicated structure and is very expensive, and malfunctions due to sticking or cutting of the operating wire are likely to occur. Therefore, an object of the present invention is to provide an endoscope injection tool that has a simple structure and can reliably bend the distal end portion without causing malfunction.

[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 formed in a bent shape in advance, and the outer tube is arranged so as to surround the periphery thereof. By advancing and retracting the straight sleeve from the proximal side, the distal end portion of the outer tube is accommodated in the sleeve and becomes straight, and the distal end portion of the outer tube comes out of the sleeve and becomes the original state. It is characterized in that it is possible to switch between a state in which it is restored to a bent shape.

[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 main body 2 is coaxially connected to the outer tube 1 on the proximal side of the outer tube 1, and a liquid feed consisting of a fluororesin tube or the like is carried from the outer tube 1 to the main body 2. The tube 5 is inserted so that it can move back and forth.

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.

The outer tube 1 is surrounded over its entire length by a rigid and straight sleeve 11 which is loosely fitted around the outer tube. The base end side of the sleeve 11 is fixed to a slider 12 which is slidably fitted in the main body 2.
By moving 2 along the body 2 in the axial direction,
The sleeve 11 moves axially along the outer tube 1.

A groove 15 is formed in the slider 12 so that a pin 14 projecting from the main body 2 can engage with the slider 12, and both ends of the groove 15 are formed as shown in FIG. It is formed by bending at a right angle.

Therefore, the sleeve 11 moves along the outer tube 1 within the range in which the pin 14 can move in the groove 15, and at both ends of the movement, the pin 14 is engaged with the bent portion of the groove 15 at a right angle. By doing so, the positioning can be performed so as not to move in the axial direction.

As shown in FIG. 1, the tip portion of the outer tube 1 has a tip coil 1a which is preliminarily smoothly bent substantially at a right angle.
The tip coil 1a is connected to the coil on the near side by a connecting pipe 4.

Therefore, when the slider 12 is fully pushed forward, as shown in FIG. 2, the sleeve 11 covers the tip of the outer tube 1 including the tip coil 1a, so that the tip coil 1a fits inside the sleeve 11. It is stored in a straightened state.

When the slider 12 is fully pulled backward, the sleeve 11 is disengaged from the tip coil 1a portion to expose the tip coil 1a, and the tip coil 1a returns to its original bent shape, as shown in FIG. ..

In such a state, the operation tube 9 is attached to the main body 2
When pushed in, as shown in FIG. 3, the injection needle 6 projects from the tip and punctures the target site of the affected area. And finally, a syringe (not shown) connected to the syringe connection mouthpiece 8.
If the drug solution is injected from the end, the injection of the drug solution to the target site is completed.

Then, after retracting the injection needle 6, the sleeve 11 is slid forward as shown in FIG. 2, and the outer tube 1 returns to a straight state as a whole again. Depending on the part to be used, it may be desired to bend the tip of the outer tube 1 at an angle smaller than a right angle. In such a case, as shown in FIG. 4, the slider 12 is stopped so that the tip of the outer tube 11 is located in the middle of the tip coil 1a, so that the tip coil 1a is bent at an arbitrary angle. can do.

Further, the present invention is not limited to the above embodiment, and an endoscope 20 as shown in FIG.
Various embodiments can be taken, such as making the forceps channel 201 of 0 serve as the sleeve 11.

[0021]

According to the endoscope injection tool of the present invention, the sleeve surrounding the distal end side of the outer tube is advanced and retracted, whereby the distal end side of the outer tube is arbitrarily bent with a very simple structure. Since it is not necessary to use an operation wire or the like, malfunction does not occur, and the distal end side can be surely bent to puncture the target site while facing it.

[Brief description of drawings]

FIG. 1 is a side sectional view of an embodiment of the present invention in a bent state.

FIG. 2 is a side sectional view of an embodiment of the present invention in a straight state.

FIG. 3 is a side view of the needle protruding state of the embodiment of the invention.

FIG. 4 is a partial side view of the embodiment of the present invention in a moderately bent state.

FIG. 5 is a partial side view of another embodiment of the present invention in a bent state.

[Explanation of symbols]

 1 Mantle Tube 1a Tip Coil 5 Liquid Transfer Tube 6 Injection Needle 11 Sleeve 12 Slider

Claims (1)

[Claims] 1. An endoscope injection tool in which an injection needle is communicatively connected to a distal end of a liquid feeding tube inserted in a flexible elongated outer sheath tube so as to be able to advance and retreat, The distal end portion of the mantle tube is formed in a bent shape in advance, and a straight sleeve arranged so as to surround the circumference is advanced and retracted from the proximal side so that the distal end portion of the mantle tube is An endoscope characterized by being able to switch between a state of being straightened by being accommodated in a sleeve and a state of the distal end side portion of the outer tube being returned from the sleeve and restored to the original bent shape. Injection device.