JPH10277150A - Needling implement for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a needling implement for an endoscope which can smoothly project a needle therefrom without the tip end of the needle abuts against a front end plug attached to the distal end of a flexible sheath. SOLUTION: In a needling unit for an endoscope, a front end plug 3 through which a guide hole 2 for allowing a needle 1 to pass therethrough is extended, is inserted in the distal end of a flexible sheath 4 in front of the latter so as to be attached to the latter, and the needle 1 located in the sheath 1 is extended and retracted from and into the front end plug 3 through remote-control by the hands. In this arrangement, the needle 1 is inclined in the flexible sheath 4 so that the tip end 1a of the needle 1 having a shape which is obliquely ground, is located in the vicinity of the center axis of the sheath 4.

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 by piercing a treatment instrument insertion channel of an endoscope for puncturing a mucous membrane or the like in a body cavity.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional puncture device for an endoscope. A guide hole 92 through which a puncture needle 91 passes is penetrated to an axial position. It is inserted and fixed to the tip of 94 from the front.

[0003] The puncture needle 91 is connected to the distal end of an insertion member 95 (a tube or a wire or the like) inserted through the entire length of the flexible sheath 94 and pushes and pulls the insertion member 95 at the hand side. By doing so, the distal end puncture needle 91 is operated to advance and retreat in the axial direction.

A connecting member 96 connects the puncture needle 91 and the insertion member 95.
During the operation of projecting the puncture needle 93, the puncture needle 91 comes into contact with the rear end of the tip base 93, and functions as a stopper for preventing the puncture needle 91 from projecting beyond a certain length. Therefore, the tip cap 93 is also necessary for its stopper function.

[0005]

When the insertion member 95 is pushed in on the hand side to make the puncture needle 91 protrude, the flexible sheath is in a curved state, or the puncture needle 9 is pushed.
If 1 or the insertion member 95 has a bending habit,
As shown in FIG. 2, the tip 91 a of the puncture needle 91 having an obliquely cut and cut shape may strike the rear end surface of the distal end base 92, thereby damaging the puncture needle 91.

Accordingly, the present invention provides a method for preventing the tip of a puncture needle from abutting against a tip base attached to a tip of a flexible sheath.
An object of the present invention is to provide a puncture device for an endoscope that allows a puncture needle to protrude smoothly.

[0007]

In order to achieve the above-mentioned object, a puncture device for an endoscope according to the present invention is provided with a tip base having a guide hole through which a puncture needle passes through an axial position. For an endoscope which is attached to the distal end of the flexible sheath by being inserted from the front, and allows the puncture needle disposed in the flexible sheath to advance and retreat by remote operation from the hand side so as to protrude and retract from the distal end cap. In the puncture device, the puncture needle is arranged to be inclined in the flexible sheath such that the tip of the puncture needle having a shape cut obliquely is located near the axis of the flexible sheath. It is characterized by.

The rear end portion of the guide hole may be formed in a tapered shape that gradually widens rearward, and the rear end portion of the outer peripheral surface of the tip die is formed in a taper shape that gradually narrows rearward. May be.

The puncture needle is an injection needle, the flexible sheath has a tubular shape, and the puncture needle advances and retreats from a hand side via an operation wire inserted through the flexible sheath. It may be operated.

[0010]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a distal end portion of an endoscope injection tool used by being inserted into a treatment tool insertion channel of an endoscope, and a guide hole 2 for passing an injection needle 1 penetrates to an axial position. The tip base 3 pierced by the flexible sheath 4
It is inserted and fixed to the tip of the front from the front.

The flexible sheath 4 is formed of, for example, a tube made of a fluorine resin which has been subjected to a heat treatment. The distal end cap 3 is made of metal or plastic, and has a spiral groove formed on an outer peripheral surface of a portion to be inserted into the flexible sheath 4, and is tightly engaged with an inner peripheral surface of the distal end portion of the flexible sheath 4. I agree.

The rear end portion 3a of the outer peripheral surface of the front end cap 3 is formed in a smooth tapered shape that gradually becomes thinner toward the end (rearward). As a result, the flexible sheath 4 has a smooth shape change from the part where the tip base 3 is inserted to the part where the tip base 3 is not inserted. Eccentricity is suppressed.

The distal end of the distal end cap 3 projects from the distal end of the flexible sheath 4, and the distal end of the flexible sheath 4
The guide hole 2 is formed at the center position thereof. The rear end portion 2a of the guide hole 2 is formed in a smooth tapered shape that gradually becomes thicker toward the end portion (rearward).

The injection needle 1 is a hollow metal pipe whose tip is cut obliquely, and is connected to the tip of an operation wire 5 that is inserted through the entire length of the flexible sheath 4. .

Therefore, by pushing and pulling the operation wire 5 at the hand side, the injection needle 1 at the distal end side is advanced and retracted in the axial direction. The operation wire 5 can be formed of, for example, a single wire of a stainless steel wire, a stranded wire, or a stranded wire formed around a single wire.

Reference numeral 6 denotes a connecting member for connecting the injection needle 1 and the operation wire 5. The base end of the injection needle 1 is fixed to one end and the distal end of the operation wire 5 is fixed to the other end. A communication hole 7 formed on the outer peripheral surface communicates with the inside of the injection needle 1.

Therefore, when a drug solution or the like is injected into the flexible sheath 4 from the near side by a syringe or the like, the solution is sent to the distal end side through the space between the flexible sheath 4 and the operation wire 5 and communicates. It is sent out from the tip of the injection needle 1 through the hole 7.

In the operation of projecting the injection needle 1 from the distal end base 3, the distal end surface of the connecting member 6 comes into contact with the rear end of the distal end base 3, so that the connecting member 6 and the distal end base 3 are injected. Needle 1
Functions as a stopper for preventing the protrusion of a certain length or more.

Although the base end of the injection needle 1 is connected to the center axis position of the connection member 6, as shown in FIG. The tip 1a is inclined and disposed in the flexible sheath 4 so that the tip 1a is located near the axis of the flexible sheath 4.

Therefore, when the operation wire 5 is pushed in from the hand side, the injection needle 1 moves in the flexible sheath 4 to the distal end side, and the tip 1a of the injection needle 1 is guided without hitting the rear end surface of the distal end base 3. Go into hole 2. The fact that the rear end portion 2a of the guide hole 2 is tapered wide also contributes to this.

The distal end face of the connecting member 6 is
After the injection needle 1 is pushed out to the full distal end until it hits the rear end surface, the injection needle 1 is used by puncturing the mucosal surface in the body cavity.

The present invention is not limited to the endoscope injection device,
The present invention can be applied to various endoscope punctures having a structure in which a needle is projected from the distal end of the sheath.

[0023]

According to the present invention, when the puncture needle is inclined in the sheath so that the tip is located near the axis of the flexible sheath, the puncture needle can be projected from the sheath. In addition, the tip of the puncture needle can enter the guide hole without hitting the rear end face of the tip base, and the puncture needle can be smoothly projected. Forming the rear end portion of the guide hole in a tapered shape gradually expanding rearward and forming the rear end portion of the outer peripheral surface of the tip end die in a tapered shape gradually narrowing rearward further contributes to this.

[Brief description of the drawings]

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

FIG. 2 is a side sectional view of a conventional endoscope puncture device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Injection needle (puncture needle) 1a Tip 2 Guide hole 3 Tip base 4 Flexible sheath 5 Operation wire 6 Connecting member

Claims (4)

[Claims] A guide hole for allowing a puncture needle to pass therethrough is inserted into a tip end of a flexible sheath, which is penetrated to an axial position, and is attached to the tip of a flexible sheath from the front, and is disposed in the flexible sheath. In a puncture device for an endoscope in which a puncture needle is advanced and retracted by remote control from a hand side to be protruded and retracted from the distal end base, the tip of the puncture needle having a shape cut obliquely is flexible. A puncture device for an endoscope, wherein the puncture needle is arranged to be inclined in the flexible sheath so as to be located near the axis of the flexible sheath. 2. The puncture device for an endoscope according to claim 1, wherein a rear end portion of said guide hole is formed in a tapered shape gradually expanding rearward. 3. The puncture device for an endoscope according to claim 1, wherein a rear end portion of the outer peripheral surface of the tip end cap is formed in a tapered shape gradually tapering rearward. 4. The puncture needle is an injection needle, the flexible sheath has a tubular shape, and the puncture needle advances and retreats from a hand side through an operation wire inserted through the flexible sheath. 4. The puncture device for an endoscope according to claim 1, which is operated.