JP2002306497A - Puncture device for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a puncture device for endoscopes which enables smooth protrusion of a puncture needle out of the outlet of a treating instrument insertion path by keeping the tip of the puncture needle from sticking the internal surface of a mantle tube in the passage near the outlet, even if the treating instrument insertion path of the endoscope is curved there. SOLUTION: A puncture needle 2 produced from a flexible stainless steel pipe inserted arranged in the flexible mantle tube 1 detachably inserted into the treating instrument insertion path 52 of the endoscope is bent naturally in a smooth circular arc at least near the tip 2a thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a puncture device for an endoscope which is used for performing a puncture treatment in a body through a treatment tool insertion passage of an endoscope.

[0002]

2. Description of the Related Art In general, a puncture device for an endoscope has a puncture needle made of a flexible stainless steel pipe inserted into and removed from a treatment tool insertion passage of an endoscope in an axial direction. The operating portion connected to the proximal end of the mantle tube can operate the puncture needle forward and backward.

[0003]

When the puncture device for an endoscope as described above is passed through the treatment instrument insertion passage of the endoscope, the distal end of the puncture needle is slightly retracted from the distal end of the mantle tube. In this state, it is pushed into the treatment instrument insertion passage from the hand side.

Therefore, there is no problem when the treatment instrument insertion passage is formed straight near the exit as in a so-called forward-looking endoscope, but there is no problem with the treatment instrument insertion passage such as an ultrasonic endoscope. Is curving just before the exit,
As shown in FIG. 6, when passing through the curved portion of the treatment instrument insertion passage 52, the tip 2a of the puncture needle 2 may pierce the inner surface of the mantle tube 1, resulting in malfunction. Reference numeral 53 denotes a treatment tool outlet of the ultrasonic endoscope 50.

Therefore, according to the present invention, even if the treatment instrument insertion passage of the endoscope is curved near the exit, the tip of the puncture needle does not pierce the inner surface of the mantle tube when passing through the endoscope, and the puncture needle is treated. An object of the present invention is to provide a puncture device for an endoscope that can smoothly project from an outlet of a device insertion passage.

[0006]

In order to achieve the above object, a puncture device for an endoscope according to the present invention is characterized in that a puncture needle made of a flexible stainless steel pipe is inserted into a treatment tool insertion passage of the endoscope. The puncture needle is disposed so as to be able to advance and retreat in the axial direction within the distal end of the flexible outer tube inserted into and removed from the outer tube. In such a puncture device for an endoscope, at least the vicinity of the distal end of the puncture needle is formed in a shape that is smoothly curved in a natural state.

[0007] In the vicinity of the tip of the puncture needle, a portion protruding from the exit of the treatment instrument insertion passage of the endoscope at the time of puncture treatment may be formed in a shape curved in an arc.

[0008]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the entire configuration of a puncture device for an endoscope. A flexible mantle tube 1 that is inserted into and removed from a treatment tool insertion passage of an endoscope (not shown) has, for example, an outer diameter of about 2 mm. It is formed of a tetrafluoroethylene resin tube having a length of about 1 to 2 m.

A puncture needle 2 made of a stainless steel pipe having a small thickness and flexibility is inserted through the entire length of the mantle tube 1 so as to be able to advance and retreat in the axial direction.
The tip 2a of the puncture needle 2 is formed into a pointed shape by being cut obliquely into an injection needle shape.

In the puncture needle 2, a removable stylet 3 for preventing clogging is inserted through the entire length. The stylet 3 is formed of a highly flexible material such as a thin stainless steel wire.

A proximal end of the mantle tube 1 is connected and fixed to an operating portion main body 11 of the operating portion 10. A proximal end of the puncture needle 2 passing through the operating portion main body 11 has a proximal end inside the puncture needle 2. An injection mouthpiece 12 for feeding a chemical solution or the like is attached. Reference numeral 13 denotes a stylet 3 knob,
It is arranged so that it can be freely disengaged from.

Reference numeral 14 denotes a stopper fixed to the puncture needle 2 in the operation unit 10. The rubber O-ring 15 attached to the operation unit main body 11 is elastically click-engaged with the stopper 14. , The state of FIG. 1 (ie,
The state where the tip of the puncture needle 2 is stored in the tip of the mantle tube 1) is maintained.

With such a configuration, the distal end 2a of the puncture needle 2 can be arbitrarily protruded and retracted from the distal end of the mantle tube 1 by operating the injection mouthpiece 12 in the axial direction with respect to the operating portion main body 11. .

Further, an injection mouth 16 protruding laterally is formed in the operation section main body 11, and a contrast agent, a cleaning solution, or the like is injected from the injection mouth 16 into a gap between the mantle tube 1 and the puncture needle 2. be able to. Reference numeral 17 denotes an O-ring for sealing.

FIG. 2 shows a distal end portion of the mantle tube 1, and a portion near the distal end 2a of the puncture needle 2 (for example, the distal end 2a).
From about 2 to 5 cm) is formed into a shape that is smoothly curved in an arc in a natural state, and the mantle tube 1 and the stylet 3 are bent along the puncture needle 2. .

Therefore, when the puncture needle 2 is pushed into the mantle tube 1 from the operation unit 10 side, the tip 2a of the puncture needle 2 is moved to the mantle tube 1 as shown in FIG.
And the stylet 3 moves integrally with the puncture needle 2.

FIG. 4 shows a state in which the puncture device for an endoscope of the above embodiment is inserted into a treatment tool insertion passage 52 of an ultrasonic endoscope 50 in which an ultrasonic probe 51 is disposed at a distal end portion. The state immediately before protruding from the treatment tool outlet 53 of the endoscope 50 is shown.

The treatment instrument insertion passage 52 at this position is provided with a treatment instrument ejection port 5 so that an endoscopic puncture instrument or the like can be projected into the ultrasonic scanning range of the ultrasonic probe 51.
3 is smoothly bent with a small radius of curvature, along which the mantle tube 1 advances.

At this time, since the vicinity of the distal end of the puncture needle 2 is formed into a smooth arc-shaped shape, the distal end 2a of the puncture needle 2 is formed on the inner surface of the outer tube 1 that is smoothly bent.
Will not be stuck.

In the range up to this position,
The distal end portion of the puncture needle 2 is elastically deformed to a state in which the distal end portion is straightened to some extent along the treatment instrument insertion passage 52, and the endoscope puncture tool advances inside the treatment instrument insertion passage 52 while maintaining the state.

When passing through the bent portion of the treatment instrument insertion passage 52, the bending direction of the puncture needle 2 is changed to the direction of the treatment instrument insertion passage 5.
The puncture device for an endoscope naturally rotates around the axis so as to coincide with the bending direction 2.

When the distal end of the mantle tube 1 reaches the treatment instrument outlet 53 in this manner, the operation section 10 pushes the puncture needle 2 so that the distal end of the puncture needle 2 as shown in FIG. The puncture treatment can be performed on a target diseased part or the like by projecting the distal end of the mantle tube 2a.

In this case, the vicinity of the distal end 2a of the puncture needle 2 is formed in a shape that is smoothly curved in a circular arc, so that the vicinity of the distal end 2a of the puncture needle 2 is formed straight (arrow B). ), The traveling direction of the tip 2 a of the puncture needle 2 is
Therefore, the puncture procedure can be easily performed because the ultrasonic wave travels in a direction close to the center direction X of the ultrasonic scanning range.

In the present invention, the puncture needle 2 is at least near the distal end (preferably, at least the treatment tool outlet 53).
(A range projecting from) may be formed in a shape curved into a smooth arc.

[0025]

According to the present invention, at least the vicinity of the distal end of the puncture needle is formed into a smoothly curved shape in a natural state, so that the treatment instrument insertion passage of the endoscope curves near the exit. However, the distal end of the puncture needle does not pierce the inner surface of the mantle tube when passing through it, and the puncture needle can be smoothly projected from the outlet of the treatment instrument insertion passage.

When used for an ultrasonic endoscope,
There is also an advantage that the puncture needle can be easily protruded toward the center of the ultrasonic scanning range.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an entire configuration of a puncture device for an endoscope according to an embodiment of the present invention.

FIG. 2 is a side sectional view of a distal end portion of the puncture device for an endoscope according to the embodiment of the present invention in a state where a puncture needle is retracted.

FIG. 3 is a side cross-sectional view of a distal end portion of the endoscope puncture device according to the embodiment of the present invention in a state where a puncture needle is protruded.

FIG. 4 is a side cross-sectional view showing a state immediately before a distal end portion of the puncture device for an endoscope according to the embodiment of the present invention projects from a treatment tool outlet of an ultrasonic endoscope.

FIG. 5 is a side sectional view showing a state in which a distal end portion of the puncture device for an endoscope according to the embodiment of the present invention projects from a treatment tool outlet of an ultrasonic endoscope.

FIG. 6 is a side cross-sectional view showing a state immediately before a distal end portion of a conventional endoscope puncture tool projects from a treatment tool outlet of an ultrasonic endoscope.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer tube 2 Puncture needle 2a Tip 3 Stylet 10 Operation part 52 Treatment tool insertion passage 53 Treatment tool outlet

Claims (2)

[Claims] 1. A puncture needle made of a stainless steel pipe having flexibility is disposed in a distal end of a flexible mantle tube inserted into and removed from a treatment instrument insertion passage of an endoscope so as to be able to advance and retreat in the axial direction. ,
In an endoscope puncture device that allows the puncture needle to advance and retreat from the proximal end side of the mantle tube so that the puncture needle protrudes and retracts from the distal end of the mantle tube, at least near the distal end of the puncture needle, A puncture device for an endoscope, wherein the puncture device is formed in a shape that is curved in a smooth arc shape in a natural state. 2. A portion protruding from an exit of a treatment instrument insertion passage of the endoscope at the time of a puncture treatment in the vicinity of the distal end of the puncture needle is formed in the shape of the arc. Endoscope puncture tool.