JPH05253179A - Endoscope injection tool - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide an endoscopic injection instrument capable of reliably puncturing an affected area from the front even with a narrow lumen in a body cavity. .. An injection for an endoscope in which an injection needle 6 is communicatively connected to a distal end of a liquid feeding tube 5 which is inserted in a slender outer sheath tube 1 having flexibility to advance and retract. In the tool, a bending device 10, 2 for bending the distal end portion of the outer tube 1 by remote control from the proximal side.
0 is set.

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.

However, in a narrow lumen portion in the body cavity,
For example, as shown in FIG. 17, the bending portion of the endoscope 50 can hardly be bent. Therefore, in many cases, the injection needle 93 of the endoscope injection instrument 90 is considerably obliquely protruded from the affected area 100, and the target site cannot be successfully punctured.

Therefore, an object of the present invention is to provide an endoscope injection tool capable of reliably puncturing an affected part from the front even with a narrow lumen in a body cavity.

[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 instrument in which an injection needle is connected for communication in and out from the tip of the mantle tube, a bending device for bending the tip side part of the mantle tube by remote operation from the proximal side is provided. Characterize.

[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
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 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 of the operation tube 23 is such that the wire stopper 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 bending portion 10 is drawn into the outer tube 1, and the bending portion 10 bends.

Then, as shown in FIG. 6, for example, when the tip portion of the tip coil 1a faces the target portion of the affected area 100 at an angle close to a right angle, the tightening ring 27 is tightened and the state is locked. To do. 50 is an endoscope.

After the lock is completed, the operation tube 9 is pushed into the main body 2. Then, as shown in FIG. 1, 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.

Then, the tightening ring 27 is loosened to release the lock, and the operating tube 23 is moved forward.
Is pushed in the distal direction, and the bending portion 10 returns to the straight state by its own restoring force.

FIG. 7 shows a second embodiment of the present invention, in which the operating cylinder 23 is locked to the main body 2 by tightening a fixing screw 31 with a fingertip instead of the tightening ring 27. Is.

FIG. 8 shows a third embodiment of the present invention in which a ratchet tooth 32 is formed on the outer periphery of the main body 2 and a claw 33 for engaging with the tooth 32 is formed inwardly on an elastic ring 34.
Is attached to the operation tube 23.

In this case, since the claw 33 is normally engaged with the tooth 32 as shown in FIG. 9, the operating tube 23 can be moved to the hand side and the operating wire 21 can be pulled. However, it cannot move in the opposite direction. Therefore, when the operation tube 23 is moved to bend the bending portion 10, that state is maintained as it is.

When the bent state of the bending portion 10 is released, the elastic ring 34 is elastically deformed by pushing the elastic ring 34 from both sides with fingertips as shown in FIG. Then, the claw 33 retreats outward and disengages from the tooth 32, so that the operating cylinder 23 can be moved forward and the bending portion 10 can be returned straight.

11 and 12 show a fourth embodiment of the present invention, in which a screw ring 36 having external teeth, which is connected to the proximal end of the operating wire 21, is engaged with an operating wheel 37 having internal teeth,
In order to prevent the screw ring 36 from rotating, it is slidably engaged with a key 38 arranged in the axial direction. The main body 2 is divided into two parts for convenience of assembly.

In this case, when the operation wheel 37 is rotated, the screw ring 36 moves in the axial direction to drive the operation wire 21 forward and backward, and unless the operation wheel 37 is operated, the screw ring 36 does not move. In the bending portion 10, the bending state at that time is maintained.

13 to 16 show a fifth embodiment of the present invention, FIGS. 13 and 14 show a state in which the bending portion 10 is straightened, and FIGS. 15 and 16 show the bending portion 10 bent. The state is shown.

In this embodiment, the tip coil 1a is not used, the outer tube 1 is formed by one coil to the tip, and only the bending portion 10 is roughly wound.

Further, the operating 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 the tip tip 1b.
Is stuck to. Even with this structure, when the operation wire 21 is pulled from the bending operation section 20 side, the bending section 10 is bent as shown in FIGS. 15 and 16.

[0031]

According to the endoscope injection tool of the present invention, since the distal end portion of the outer tube can be bent by remote control from the proximal side, even in a narrow lumen portion in a body cavity or the like. It has an excellent effect that the injection needle can be directly faced to the affected area and puncture can be surely performed.

[Brief description of drawings]

FIG. 1 is a side view of a use state of 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 environment of the first embodiment of the present invention.

FIG. 7 is a side sectional view of a hand side portion of a second embodiment of the present invention.

FIG. 8 is a side sectional view of a hand side portion of a third embodiment of the present invention.

FIG. 9 is a front sectional view (IX-IX sectional view) of a hand side portion of a third embodiment of the present invention.

FIG. 10 is a front sectional view of a hand side portion of a third embodiment of the present invention.

FIG. 11 is a side sectional view of a hand side portion of a fourth embodiment of the present invention.

FIG. 12 is a front sectional view (XII-XII sectional view) of a hand side portion of a fourth embodiment of the present invention.

FIG. 13 is a side view of the tip portion of the fifth embodiment of the present invention.

FIG. 14 is a side sectional view of a front end portion of a fifth embodiment of the present invention.

FIG. 15 is a side view of the tip portion of the fifth embodiment of the present invention in a bent state.

FIG. 16 is a side cross-sectional view of a tip portion of a fifth embodiment of the invention in a bent state.

FIG. 17 is a schematic diagram showing a usage environment of a conventional example.

[Explanation of symbols]

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

[Procedure amendment]

[Submission date] March 24, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

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. An endoscope injection tool comprising a bending device for bending the distal end portion of the outer tube by remote control from the proximal side.