JP2000166863A - Puncturing device for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To replace a flexible needle shaft or the like at a low cost by detachably connecting a needle root base portion attached to the base of a flexible needle shaft inserted into a sheath to a slide cylinder and making the needle root base and the flexible needle shaft integrally separable from the slide cylinder. SOLUTION: A cylindrical body 2 held with fingers or the like is connected to the end of a flexible sheath inserted into a treatment device insertion channel of an endoscope, and a needle root base 5 to which a syringe is connected is fixed to a position where the base of the flexible needle shaft 3 comes out passing through the slide cylinder 4 from the cylindrical body 2. This needle root base 5 is engaged integrally with a connecting ring 6 formed in a cap form with screws. A clicking groove 9 is formed in the inside periphery of the connecting ring 6, and through the engagement of a C ring 10 fixed pinchedly to the base 4a of the slide cylinder 4 with the clicking groove 9, clicking fixation is made, so as to facilitate the replacement of the needle end base 5 and the needle shaft 3.

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 inserted into and removed from a treatment tool insertion channel of an endoscope and used for injecting a drug solution into a body cavity.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional puncture device for an endoscope. A tubular main body 92 is connected to a base end of a flexible sheath 91 inserted into and removed from a treatment tool insertion channel of the endoscope. Have been.
The lower half of the figure shows the appearance and the upper half shows the cross section.

A flexible needle shaft 93 having a needle tip 93a connected to the distal end thereof is inserted through the entire length of the sheath 91 so as to be able to advance and retreat in the axial direction, and is attached to the proximal end of the flexible needle shaft 93. The needle base 95 thus attached is attached to a slide operation cylinder 94 which is fitted to the cylindrical main body 92 so as to be able to advance and retreat in the axial direction.

Accordingly, by sliding the slide operation cylinder 94 in the axial direction with respect to the cylindrical main body 92, the needle point 93a connected to the distal end of the flexible needle shaft 93 can be moved in and out of the distal end of the sheath 91. Can be.

Reference numerals 96 and 97 denote O-rings and click grooves for elastically fixing the slide operation cylinder 94 to the tubular main body 92 with the needle tip 93a protruding from the distal end of the sheath 91.

[0006]

The puncture device for an endoscope often needs to be replaced because the flexible needle shaft 93 buckles or the needle tip 93a is bent.

In the conventional puncture device for an endoscope as described above, the needle base 95 attached to the base end of the flexible needle shaft 93 is fixed to the slide operation cylinder 94,
Since the flexible needle shaft 93 and the slide operation tube 94 are integrally formed, when the flexible needle shaft 93 is replaced, the slide operation tube 94 must be replaced together, and the waste portion is not replaced. The cost ratio was high and the economy was poor.

Further, when the slide operation cylinder 94 is operated in a direction in which the flexible needle shaft 93 is pulled out during use, if the slide operation cylinder 94 is slightly applied with too much force, the slide operation cylinder 94 is rapidly moved from the cylindrical main body 92 at once. The flexible needle shaft 93 is easily buckled.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a puncture device for an endoscope in which a flexible needle shaft can be replaced at a low cost.

[0010]

In order to achieve the above-mentioned object, an endoscope puncture device according to the present invention comprises a flexible sheath inserted into and removed from a treatment instrument insertion channel of an endoscope. A needle base is attached to the base end of a flexible needle shaft which is inserted into the sheath so as to be able to advance and retreat in the axial direction over the entire length thereof, and is fitted to the tubular body so as to be able to advance and retreat in the axial direction. In the puncture device for an endoscope attached to the inserted slide operation tube, the needle base portion is detachably connected to the slide operation tube, and the needle base and the flexible needle shaft are connected to each other. Can be integrally separated from the slide operation cylinder.

[0011] A stopper may be provided for restricting the slide operation tube from coming out of the cylindrical main body. Further, a click mechanism for elastically engaging the needle base with the slide operation cylinder may be provided, and the needle base rotates around the axis with respect to the slide operation cylinder. May be provided for preventing rotation.

[0012]

Embodiments of the present invention will be described with reference to the drawings. 3 and 4 show the puncture device for an endoscope according to the embodiment of the present invention. FIG. 3 shows a state in which a needle tip 3a protrudes from the distal end of the sheath 1, and FIG. Shows a state where the needle tip 3a is retracted.

The flexible sheath 1 inserted into and removed from the treatment instrument insertion channel of the endoscope uses a tightly wound coil pipe to secure the strength of the waist, and the thickness of the sheath 1 is reduced. Here, in order to make it as thin as possible, a wire in which a wire having a cross-sectional shape squashed flat is closely wound is used.

A tubular main body 2 held by a fingertip or the like is connected to the proximal end of the sheath 1. Reference numeral 2a denotes a connecting tube fitted into the cylindrical main body 2 and fixed by screws (not shown), and the base end of the sheath 1 is fixed by press fitting, soldering, silver brazing, or the like. In addition, a tightly wound coil (not shown) for press-fitting is fixed to the distal end side of the connecting cylinder 2a by press-fitting so as to penetrate the proximal end side of the sheath 1.

A mouth ring 2b is threadedly connected to the proximal end of the cylindrical body 2. The mouth ring 2b is formed to have a larger outer diameter than the cylindrical main body 2 so that a fingertip can be caught, and also functions as a stopper for preventing a slide operation tube 4 described below from being pulled out. The inner diameter is formed smaller than the main body 2.

A slide operation cylinder 4 is fitted into the cylindrical main body 2 so as to be able to advance and retreat in the axial direction. Slide operation cylinder 4
Is formed with an outer diameter near the distal end portion to be fitted to the inner peripheral surface of the tubular main body 2, and the other portion is thinner than that, and formed to have an outer diameter fitted to the inner peripheral surface of the mouth ring 2b. .

Therefore, when the slide operation tube 4 is slid in the direction of being pulled out from the inside of the cylindrical main body 2, the step near the tip of the slide operation tube 4 comes into contact with the back surface of the mouth ring 2b, and the slide operation tube 4 is further moved. It cannot be pulled out. However, when the screw between the mouth ring 2b and the cylindrical main body 2 is released, the slide operation cylinder 4 can be pulled out from the inside of the cylindrical main body 2.

In the sheath 1, a rigid needle tip 3a is press-fitted at the distal end and a hard base pipe 3b is press-fitted and connected at the proximal end. A flexible needle shaft 3 is inserted through the entire length so as to be able to advance and retreat in the axial direction. The needle tip 3a and the base pipe 3b may be formed integrally with the flexible needle shaft 3, respectively. Hereinafter, the base pipe 3b will be described as being included in the flexible needle shaft 3.

The base end of the flexible needle shaft 3 passes through the slide operation tube 4 from inside the cylindrical main body 2, and a needle base 5 is joined and fixed at a position protruding from the hand side of the slide operation tube 4. By connecting a syringe (not shown) to the needle base 5,
A chemical solution or the like can be sent to the flexible needle shaft 3 and sent out from the needle tip 3a.

The needle base 5 is integrally connected to an axial position of a connecting ring 6 formed in a cap shape by screwing and bonding. As a result, the needle base 5 and the connecting ring 6 are integrally connected to the base end of the flexible needle shaft 3.

The base end cap 4 a screwed to the proximal end of the slide operation barrel 4 and integrally connected by bonding is engaged with the connecting ring 6 so as to enter the connecting ring 6. At the time of the engagement, the protruding pin 7 protruding from the base end cap 4 a is connected to the connecting ring 6.
The coupling ring 6 does not rotate with respect to the base end cap 4a (therefore, with respect to the slide operation cylinder 4).

A first click groove 9 is formed on the inner peripheral surface of the connecting ring 6.
Is formed, and the first C-ring 10 sandwiched between the base end cap 4a and the slide operation cylinder 4 engages with the first base ring 4a, so that so-called click fixing is performed.

Therefore, in the state where the click fixing is performed, the needle base 5 and the flexible needle shaft 3 are integrated with the slide operation cylinder 4, and the slide operation cylinder 4
Is slid in the axial direction with respect to the cylindrical main body 2, as shown in FIG. 3 and FIG.
Can be moved in and out of the distal end of the sheath 1.

An O-ring 11 mounted on the outer periphery of the distal end of the slide operation cylinder 4 is in sliding contact with the inner surface of the cylindrical main body 2, and a needle tip 3 a is provided on the rear end side of the cylindrical main body 2 in the sheath 1. A second click groove 13 which engages with the O-ring 11 when housed in the housing is formed.

Thus, even if the operator grips and moves the cylindrical main body 2, the slide operation cylinder 4 does not slide easily. Therefore, the needle tip 3a does not accidentally pop out from the distal end of the sheath 1.

A third click groove 14 is formed in the inner peripheral surface of the mouth ring 2b, and when the needle tip 3a protrudes from the distal end of the sheath 1, near the proximal end of the slide operation cylinder 4 The second C-ring 12 mounted on the outer surface of the second member engages with the second C-ring 12, thereby performing click fixing.

At this time, the distal end of the flexible needle shaft 3 comes into contact with the back surface of the distal end base 1a attached to the distal end of the sheath 1, and the flexible needle shaft 3 is compressed in the sheath 1. And bends.

When the needle tip 3a is housed in the sheath 1, the O-ring 11 mounted on the outer surface of the distal end of the slide operation cylinder 4 engages with the second click groove 13, and
Light click locking occurs.

The puncture device for an endoscope thus configured is
When the buckling of the flexible needle shaft 3 or the bending of the needle tip 3a occurs, as shown in FIG. 1, the connection ring 6 is pulled strongly toward the hand side to release the engagement with the slide operation cylinder 4.

As a result, the flexible needle shaft 3 is pulled out of the sheath 1, and as shown in FIG. 2, the connecting ring 6 and the needle base 5 and the flexible needle shaft 3 are It can be removed from the tubular main body 2 and the slide operation barrel 4 and replaced.

When the connecting ring 6 is engaged with the slide operation cylinder 4, the relative rotation between the two is restricted and the stable operation is set, and the flexible needle shaft 3 is pulled out during use. When the slide operation tube 4 is operated, the slide operation tube 4 does not fall out of the cylindrical main body 2, so that a state in which the flexible needle shaft 3 erroneously buckles does not occur.

[0032]

According to the present invention, the needle base is detachably connected to the slide operation barrel so that the needle base and the flexible needle shaft can be integrally separated from the slide operation cylinder. With this configuration, it is not necessary to replace the slide operation barrel when replacing the flexible needle shaft, so that the flexible needle shaft can be replaced at low cost.

Also, by providing a stopper for restricting the slide operation cylinder from coming off the cylindrical main body,
Since the slide operation cylinder does not fall out of the cylindrical main body during use, it is possible to reduce the number of cases where the flexible needle shaft is erroneously buckled.

[Brief description of the drawings]

FIG. 1 is a side half sectional view of a proximal portion of a puncture device for an endoscope according to an embodiment of the present invention when a flexible needle shaft is removed.

FIG. 2 is a side view showing a state in which a flexible needle shaft and a sheath of the puncture device for an endoscope according to the embodiment of the present invention are separated.

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

FIG. 4 is a side cross-sectional view of the puncture device for an endoscope according to the embodiment of the present invention in a state where a needle tip is retracted.

FIG. 5 is a side sectional half view of a conventional puncture device for an endoscope.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sheath 2 Cylindrical main body 2b Mouth ring (stopper) 3 Flexible needle shaft 3a Needle tip 4 Slide operation cylinder 5 Needle base 6 Connecting ring 9 First click groove 10 First C ring

Claims (4)

[Claims] 1. A flexible body which is attached to a proximal end of a flexible sheath inserted into and removed from a treatment instrument insertion channel of an endoscope, and which is inserted through the entire length of the sheath so as to be able to advance and retreat in an axial direction. A needle base attached to the proximal end of the sex needle shaft, the endoscope puncture device attached to a slide operation tube fitted in the cylindrical body so as to be able to advance and retreat in the axial direction; Characterized in that the needle base and the flexible needle shaft can be integrally separated from the slide operation tube by detachably connecting the slide operation tube to the slide operation tube. Puncture tool. 2. The puncture device for an endoscope according to claim 1, further comprising a stopper for restricting the slide operation tube from coming off from the cylindrical main body. 3. The endoscope puncture device according to claim 1, further comprising a click mechanism for elastically engaging the needle base with the slide operation barrel. 4. The puncture device for an endoscope according to claim 1, further comprising a rotation stopper for preventing the needle base from rotating around an axis with respect to the slide operation cylinder. .