JP3100739B2 - Endoscope injection tool - Google Patents

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 into a forceps channel of an endoscope for injection into a body cavity.

[0002]

2. Description of the Related Art In this type of endoscope injection device, an injection needle is attached to the tip of a liquid feed tube which is inserted into a flexible elongated mantle tube so as to be able to advance and retreat, and attached to the proximal side of the liquid feed tube. A syringe is connected to the provided base so that a drug solution or the like can be sent from the syringe to the injection needle.

[0003]

When the injection needle of such an endoscope injection tool is pierced into the affected part, the needle tip slides unless it is pierced from the front at an angle close to a right angle to the affected part to some extent. Often it does not work.

[0004] Therefore, a bendable curved portion is formed at the distal end of the mantle tube so that the affected part can be pierced from the front, and an operation wire is connected to the operation portion connected to the proximal side of the mantle tube. It is conceivable to be able to bend the bend remotely by towing.

However, in such a case, when the pulling of the operation wire is released in a state where the bending portion is bent, the bending portion returns vigorously in a straight direction by its own repulsive force. It is very dangerous if the needle comes out of the tip of the mantle tube at that time.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a safe endoscope injector in which a curved portion on the distal end side does not return vigorously even when the operation wire is released.

[0007]

Means for Solving the Problems To achieve the above object, an endoscope injection device according to the present invention is provided at the tip of a liquid feeding tube which is inserted and retracted into a flexible elongated mantle tube.
In an endoscope injection tool in which an injection needle is connected and connected freely from the distal end of the outer tube, a bendable curved portion formed at a distal end portion of the outer tube is connected to a proximal side of the outer tube. While being able to bend remotely by pulling the operating wire from the operating unit,
A resistance applying means is provided for applying resistance to the operation wire pulled by the bending portion which attempts to restore from the bent state to a straight direction.

[0008]

An embodiment will be described with reference to the drawings. FIG. 2 shows an injection tool for an endoscope.
This is a flexible and elongated mantle tube composed of a closely wound coil having a length of about 1.5 m and a length of about 1.5 mm.

A tubular main body 2 is coaxially connected to and connected to the mantle tube 1 at the proximal side of the mantle tube 1. Reference numeral 3 denotes a buckling prevention coil mounted on the outside of the mantle tube 1 so as to prevent the mantle tube 1 from being bent near a connection portion with the main body 2.

A liquid supply tube 5 made of a fluororesin tube or the like is inserted into the outer tube 1 so as to be able to advance and retreat over substantially the entire length. An injection needle 6 is fixedly connected to the distal end of the liquid feed tube 5 so as to be able to freely enter and exit from the distal end of the mantle tube 1.

On the proximal side of the liquid feeding tube 5, a syringe connection base 8 is fixed so as to protrude from the proximal side of the main body 2 so as to be able to advance and retreat. In addition, a cylindrical operation tube 9 surrounding the vicinity of the proximal end of the liquid feeding tube 5 is fixed to the syringe connection base 8 so that the liquid feeding tube 5 can advance and retreat in the axial direction without bending.

The operation tube 9 is fitted into the main body 2 so as to be able to advance and retreat. Therefore, the operating tube 9 can be moved forward and backward in the axial direction by pinching the operating tube 9 with a fingertip. When the operating tube 9 is pushed into the main body 2, the injection needle 6 protrudes from the tip, and as shown in FIG. Is pulled out of the main body 2, the injection needle 6 is pulled into the distal end of the mantle tube 1.

The distal end of the mantle tube 1 has a length of, for example, 1 to 3
In the part of cm, a tip coil 1a in which a rear half part 10 is roughly wound with a gap is used by being connected by a connection pipe 4. The coarsely wound portion has a lower waist than the other portions and is easily bent, and has a curved portion that can be bent by remote control. Hereinafter, this portion is referred to as a curved portion 10.

A bending operation section 20 for bending the bending section 10 is attached to the main body 2, and an operation wire 21 operated by the bending operation section 20 to advance and retreat is passed through the inside of the mantle tube 1 and a base of the bending section 10. The distal end of the operation wire 21 is fixed to the distal tip 1b attached to the distal end of the distal coil 1a.

FIG. 1 shows the structure of the bending operation section 20. Reference numeral 23 denotes an operation cylinder which is movably fitted on the outer peripheral surface of the main body 2. A wire fixing pin 24 for locking the base end of the operation wire 21 to the operation tube 23 is loosely fitted into an elongated hole 25 formed in the main body 2 in the axial direction. Therefore, the operation cylinder 23 can be moved only in the axial direction of the main body 2, and the movement range is such that the wire fixing pin 24 is
It is a length that can move within.

The operation cylinder 23 is, as shown in FIG.
The hand side portion is divided by four slits from the end side. Then, the tapered surface 26 that comes into contact with the end portion
Is screwed into the operation 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 four parts are pressed against the surface of the main body 2 by the tapered surface 26 of the fastening ring 27,
Will be in a locked state where it cannot be slid.

An O-ring 30 made of elastic rubber is mounted on a fitting portion between the main body 2 and the operation cylinder 23 in a circumferential groove formed on the outer peripheral side of the main body 2. The O-ring 30 provides a frictional resistance to the sliding movement between the main body 2 and the operation cylinder 23.

In FIG. 1, reference numeral 12 denotes a connecting pipe for connecting the liquid sending tube 5 and the syringe connection base 8. 13
Is an O-ring serving as a click for lightly locking the movement of the operation tube 9, and is attached to a mouth ring 15 attached to a mouth of the main body 2 by a fastening nut 14.

According to the endoscope injection device of the embodiment configured as described above, as shown in FIG.
, The operation wire 21 is pulled, and as shown in FIG.
The operation wire 21 passing through the outside at the portion 0 is the mantle tube 1
And the bending portion 10 is bent.

When the distal end portion of the distal end coil 1a faces the target portion of the affected part at an angle close to a right angle, the tightening ring 27 is tightened to lock the state.

When the lock is completed, the operation tube 9 is pushed into the main body 2. Then, as shown in FIG. 5, the injection needle 6 protrudes from the distal end and is punctured at the target site of the affected part. Finally, when the medicinal solution is injected from a syringe (not shown) connected to the syringe connection base 8, the injection of the medicinal solution to the target site is completed.

Then, the injection needle 6 is retracted, and the
When the lock is released to release the lock, the operation wire 2 is restored by the restoring force of the coil of the bending portion 10 to return to the straight state.
1 is pulled forward, and as shown in FIG. 6, the operation tube 23 connected to the proximal end of the operation wire 21 attempts to move forward.

However, for the movement, the O-ring 30
, The brake is applied to the movement of the operation cylinder 23, that is, the movement of the operation wire 21. Therefore, when the lock is released by loosening the tightening ring 27 from the state in which the bending portion 10 is fully bent, the restoring force of the bending portion 10 and the resistance of the O-ring 30 to the operation wire 21 pulled by the cancellation cancel out, The bending portion 10 returns slowly to a certain angle, where it stands still.

From this position, if the operation cylinder 23 is moved forward by hand, the operation wire 21 is pushed in the distal direction, and the bending portion 10 returns to a straight state by its own restoring force.

If the magnitude of the frictional resistance applied by the O-ring 30 is set to be large, even if the fastening ring 27 is loosened and the lock is released, the bending portion 10 hardly returns to the straight direction by itself, and If the magnitude of the frictional resistance applied by the ring 30 is set small, the range in which the bending portion 10 slowly returns to the straight direction after the lock is released becomes large.

[0027]

According to the endoscope injection device of the present invention, the resistance is applied by the resistance applying means to the operation wire pulled by the curved portion, which is to be restored from the bent state in the straight direction. Since the brake is applied to the restoring operation of the bending portion and the movement becomes slow, the bending portion on the distal end side in the body cavity does not suddenly return straight and is safe.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a proximal portion of an embodiment of the present invention.

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

FIG. 3 is a front sectional view (II) of a proximal portion of the embodiment of the present invention.
(I-III sectional view).

FIG. 4 is a side view of the embodiment of the present invention in a curved state.

FIG. 5 is a side view of the embodiment of the present invention in a state where the needle is projected.

FIG. 6 is a side sectional view of a proximal portion of the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer tube 5 Liquid sending tube 6 Injection needle 10 Bending part 20 Bending operation part 21 Operation wire 30 O-ring

──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. ⁷ Identification code FI G02B 23/24 G02B 23/24 A

Claims (1)

(57) [Claims] 1. An endoscope injection tool in which an injection needle is connected to a distal end of a liquid feeding tube which is inserted into a flexible elongate outer tube so as to be able to advance and retreat, so as to be able to move in and out of the distal end of the outer tube. A bendable curved portion formed at a distal end portion of the mantle tube can be remotely bent by pulling an operation wire from an operation portion connected to the proximal side of the mantle tube, An endoscope injection device, further comprising a resistance applying means for applying resistance to the operation wire pulled by the bending portion which is to be restored from the bent state to a straight direction.