JPH05261062A - Injection means for endoscope - Google Patents

Abstract

PURPOSE:To provide the injection means for an endoscope which can be surely bent in the part on its front end side without generating an operation defect and can be punctured even to lesion existing in the position near the front end of the endoscope from the front of the lesion by curving the front end of the endoscope. CONSTITUTION:This injection means for the endoscope is constituted by communicating and connecting an injection needle 6, freely insertibly 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 5 inserted freely movably forward and backward into the sheath pipe 1. A shape memory alloy 10 which memorizes a curved shape, is nearly straight at ordinary temp. and is changed to the curved shape memorized therein when heated is disposed near the front end of the above-mentioned sheath pipe 1 along the axial direction of the pipe. A heating means for heating the shape memory alloy 10 by a remote operation is provided.

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, as shown in FIG. 5, for example, a bending portion 92 that is easily bent is formed at the tip of an outer tube 91 formed of a tightly wound coil so that the operation wire 93 pulled from the hand side is bent. The bending portion 9 is arranged outside the coil at the portion 92, and the operating wire 93 is pulled from the hand side.
It is conceivable to allow 2 to be bent by remote control. By doing this, it is possible to puncture the affected area from the front.

However, when the operation wire 93 is arranged outside the coil in this way, as shown in FIG. 6, when the injection tool is inserted into the endoscope 200 for use, the part of the operation wire 93 is always inside. It must project from the endoscope 200.

Therefore, it is necessary to always provide a distance L between the affected part 100 to be injected and the tip of the endoscope 200, and the injection is performed to the affected part located at a short distance from the tip of the endoscope 200. There is a drawback that cannot be done.

Further, when the operation wire is used, malfunction tends to occur due to sticking or cutting of the operation wire. Therefore, the present invention can surely bend the tip side portion without causing a malfunction, and bends the tip of the injection tool even for the affected area located near the tip of the endoscope. An object of the present invention is to provide an endoscope injection tool that can be punctured from the front.

[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 device in which an injection needle is connected for communication in and out from the tip of the mantle tube, the bent shape is memorized, is substantially straight at room temperature, and changes to the memorized bent shape when heated. The shape memory alloy material is disposed near the tip of the outer tube along the tube axis direction, and a heating means for remotely heating the shape memory alloy material is provided.

[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.

FIG. 3 shows the tip portion of the outer tube 1.
A tip coil 1a having a weak waist and easy bending is used at the tip side of the jacket tube 1 having a length of 1 to 3 cm, for example, and is connected to the proximal coil of the jacket tube 1 by a connecting tube 4. .. 1b is a tip chip attached to the tip of the tip coil 1a.

In the tip coil 1a, a shape memory alloy material 10 having an elongated straight shape at room temperature is arranged along the tube axis so as not to interfere with the liquid feeding tube 5 and the injection needle 6. There is.

The shape memory alloy material 10 remembers a shape bent at a substantially right angle, changes to the memorized shape by being heated, and returns to a straight shape again at room temperature. Reference numeral 11 is a lead wire for applying a heating current to the shape memory alloy material 10, and is connected to the shape memory alloy material 10 via the connection pipe 4. This lead wire 11
As shown in FIG. 2, in the middle of the main body 2, it splits outward,
It is connected to the heating power supply 12.

According to the endoscope injection tool of the embodiment thus constructed, when the heating power source 12 is turned on, an electric current flows through the shape memory alloy material 10 to heat it. As a result,
As shown in FIG. 3, the shape memory alloy material 10 is deformed into a memorized bent shape, and the rear half of the tip coil 1a is smoothly bent at a substantially right angle. Since the injection needle 6 advances and retreats, it is better not to bend the front half of the tip coil 1a.

FIG. 4 shows a state in which the endoscope injection tool of this embodiment is inserted into the endoscope 200 and the affected part 100 is punctured by the injection needle 6, and there is no operation wire or the like. The bent portion of the tip coil 1 a can be brought close to the tip of the endoscope 200.

Therefore, the distal end portion of the outer tube 1 can be bent at a predetermined angle to easily puncture the affected area 100 near the distal end of the endoscope 200 by directly facing it.

Finally, by injecting the drug solution from a syringe (not shown) connected to the syringe connection mouthpiece 8, the injection of the drug solution to the target site is completed, the injection needle 6 is retracted, and the heating power source 12 is turned on. If turned off, shape memory alloy material 1
The temperature of 0 drops to normal temperature and becomes straight, and the tip coil 1a portion returns to a straight shape.

[0021]

According to the endoscope injection tool of the present invention, the shape memory alloy material disposed near the distal end of the mantle tube can be bent by heating, and it is necessary to use an operation wire or the like. Since there is no malfunction, the tip side part can be bent securely without causing malfunction, and since the bent part can be brought close to the tip of the endoscope, the affected part located near the tip of the endoscope Even with respect to the above, there is an excellent effect that the tip can be bent to easily puncture from the front.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a bent state of a tip portion according to an embodiment of the present invention.

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

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

FIG. 4 is a side view of the use example of the present invention.

FIG. 5 is a side view of a conventional example in a bent state.

FIG. 6 is a side view of a conventional example in use.

[Explanation of symbols]

 1 Mantle Tube 1a Tip Coil 5 Liquid Transfer Tube 6 Injection Needle 10 Shape Memory Alloy Material 12 Power Supply for Heating

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, A shape memory alloy material that remembers the bent shape and is almost straight at room temperature and changes to the bent shape that is remembered by being heated is arranged near the tip of the outer tube along the tube axis direction. An endoscope injection tool comprising heating means for heating the shape memory alloy material by remote control.