JP2000166862A - Puncturing device for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate confirmation of the wear out of an O-ring by forming a clicking mechanism for fixing the advance and withdrawal of a slide cylinder, so that a first O-ring engages with an engagement groove when a needlepoint projects from a sheath tip and a second O-ring engages with the engagement groove, when the needlepoint is housed in the sheath. SOLUTION: A flexible needle shaft 3, to the end of which a needle 3a is connected is inserted into a sheath 1 that is inserted into and removed from the treatment device insertion channel of an endoscope, and a slide cylinder 4 connected to the base of the needle shaft 3 is fitted capable of advancing and withdrawing into a cylindrical body 2. When the slide cylinder 4 is pushed in until it butts against the connecting cylinder 2a and a needlepoint 3a projects, the first O-ring 11 engages with an engagement groove 21, and provides an appropriate sensation of clicking, where as when the slide cylinder 4 is pulled toward an operator holding the cylindrical body 2, the engagement of the first O-ring 11 with the engagement groove 21 is released, and the second O-ring 12 instead is engaged with the engagement groove 21, so as to similarly provide clicking sensation.

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 a treatment tool insertion channel of an endoscope and used for injection or the like into a body cavity.

[0002]

2. Description of the Related Art FIG. 6 shows a conventional puncture device for an endoscope. A tubular main body 92 is connected to a base end of a flexible sheath 91 which is 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 over the entire length thereof, and is connected to the base end of the flexible needle shaft 93. The slide operation cylinder 94 is inserted into 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.

However, in order to pierce the needle tip 93a into the mucous membrane in the body cavity, the slide operation cylinder 94 is fixed to the tubular main body 92 with the needle tip 93a protruding from the distal end of the sheath 91.
It is necessary to temporarily integrate the flexible needle shaft 93 and the sheath 91.

Therefore, an elastic O-ring 95 is mounted on the inner peripheral surface of the cylindrical main body 92, and the O-ring 9 is
A so-called click mechanism is provided by forming an engagement groove 96 that engages with the outer peripheral surface of the slide operation cylinder 94.

The O-ring 9 is moved by moving the slide operation cylinder 94 in the axial direction with respect to the cylindrical main body 92.
The engagement groove 96 can be disengaged from the engagement groove 96, but it is set so that a considerable force is required to release the engagement state (the state where the click is effective).

[0008]

However, as described above, since the O-ring 95 mounted on the inner peripheral surface of the cylindrical main body 92 is hardly visible from the outside, the O-ring 95 is not noticed even if it is cut or worn. For the first time, a malfunction may be known and treatment such as injection may not be performed. Further, the replacement of the O-ring 95 mounted on the inner peripheral surface of the cylindrical main body 92 cannot be easily performed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an endoscope puncture device which makes it easy to check the state of wear of an O-ring constituting a click, and which can be easily replaced when worn. I do.

[0010]

In order to achieve the above 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 cylindrical main body connected to the base end of the flexible needle shaft; a flexible needle shaft inserted through the entire length of the sheath so as to be able to advance and retreat in the axial direction to form a needle tip at the distal end; A sliding operation tube connected to the end and fitted in the cylindrical body so as to be able to advance and retreat in the axial direction, and a detachable click mechanism for elastically fixing the advance and retreat of the sliding operation tube with respect to the cylindrical body. In the puncture device for an endoscope having: a first and a second O-rings made of a resilient material mounted on an outer peripheral surface of the slide operation tube; Formed by the engaging groove formed on the peripheral surface, and the needle tip is The first O-ring engages with the engagement groove when it protrudes from the distal end of the sheath, and the second O-ring engages with the engagement groove when the needle tip is housed in the sheath. Is characterized in that it is adapted to engage.

The engagement groove and the first O which are formed when the needle tip projects from the distal end of the sheath are provided.
The engagement force between the engagement groove and the second O-ring performed when the needle tip is housed in the sheath may be smaller than the engagement with the ring.

The second O-ring engages with the second O-ring when the needle tip projects from the distal end of the sheath.
May be formed on the inner peripheral surface of the cylindrical main body.

[0013]

Embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a puncture device for an endoscope according to a first embodiment of the present invention, and FIG.
2 shows a state in which the needle tip 3a protrudes from the tip of the sheath 1, and FIG. The lower half of the figure shows the appearance and the upper half shows the cross section. This is the same in other figures.

The flexible sheath 1 inserted into and removed from the treatment instrument insertion channel of the endoscope uses a tightly wound coil pipe in order 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 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 cylinder fitted and screwed into the cylindrical main body 2, and includes a sheath 1
Is fixed by soldering or silver brazing. A mouth member 2b for integrally catching the fingertip is integrally joined to the proximal end of the tubular main body 2.

The connecting cylinder 2a and the mouth member 2b are
Is formed as a separate part from the tubular main body 2 because it is formed from a pipe material, but it may be formed as the same part as the tubular main body 2 originally. Therefore, in the following description, both the connecting cylinder 2a and the mouth member 2b
Shall be treated as part of

A flexible needle shaft 3 made of a flexible tube having a needle tip 3a connected to the distal end thereof is inserted into the sheath 1 so as to be able to advance and retreat in the axial direction over the entire length. A slide operation cylinder 4 connected to a base end of the cylindrical body 3 is fitted into the cylindrical main body 2 so as to be able to advance and retreat in the axial direction. The needle tip 3a may be formed integrally with the flexible needle shaft 3.

A needle base 4a is integrally fixed to the proximal end of the slide operation cylinder 4, and the base end of the flexible needle shaft 3 is fixedly connected to the needle base 4a. Therefore, by connecting an injection cylinder (not shown) to the needle base 4 a, a drug solution or the like can be sent to the flexible needle shaft 3.

Then, by sliding the slide operation barrel 4 in the axial direction with respect to the tubular main body 2, the needle tip 3a of the flexible needle shaft 3 is moved to the sheath 1 as shown in FIGS. From the tip of the

However, in order to pierce the needle tip 3a into the mucous membrane in the body cavity, the slide operation barrel 4 is fixed to the tubular main body 2 with the needle tip 3a protruding from the distal end of the sheath 1, and a flexible needle shaft is provided. 3 and the sheath 1 need to be temporarily integrated.

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 and bent in the sheath 1. So that

In order to elastically fix the advance / retreat of the slide operation cylinder 4 with respect to the cylindrical main body 2, first and second O-rings 11 and 12 made of an elastic material and the O-rings 11 and 12 are provided. A detachable click mechanism formed by the engaging groove 21 to be engaged is provided.

The O-rings 11 and 12 are provided on the slide operation cylinder 4.
Are fitted into the O-ring mounting grooves 13 and 14 formed in the circumferential direction near the front and rear ends, respectively, so as to protrude slightly.
The engagement groove 21 is provided at the proximal end 2b at the proximal end of the cylindrical main body 2.
Is formed on the inner peripheral surface of the.

Therefore, as shown in FIG. 1, the slide operation tube 4 is pushed into the cylindrical main body 2 until it comes into contact with the connection tube 2a, and the needle tip 3a projects from the distal end of the sheath 1 so that the flexible needle shaft 3 Is slightly compressed, the first O-ring 11 mounted on the proximal side of the slide operation cylinder 4 engages with the engagement groove 21.

As a result, a so-called “clicked state” is obtained, and the axial operation of the slide operation cylinder 4 with respect to the cylindrical main body 2 is elastically fixed. 3 is integrated with respect to the movement in the axial direction.

In this state, when the slide operation cylinder 4 is pulled toward the hand side by applying force while the cylindrical main body 2 is being pinched, the engagement between the first O-ring 11 and the engagement groove 21 is released, The slide operation tube 4 is pulled out from the cylindrical main body 2 toward the hand side, and the needle tip 3 a is drawn into the distal end of the sheath 1.

Then, as shown in FIG. 2, the second O-ring 12 mounted on the distal end side of the slide operation cylinder 4 is engaged with the engagement groove 21, and the needle tip 3a is drawn into the sheath 1. The click is effective in the state of being clicked.

Further, from this state, when the slide operation cylinder 4 is pulled toward the user by applying force while the cylindrical main body 2 is pinched, the engagement between the second O-ring 12 and the engagement groove 21 is reduced. Then, the entire flexible needle shaft 3 can be pulled out of the sheath 1.

The puncture device for an endoscope thus configured is
Since the O-rings 11 and 12 constituting the click mechanism are mounted on the slide operation tube 4 that can be pulled out from the tubular main body 2, it is easy to check the wear state of the O-rings 11 and 12, and to check the wear and scratches. When there is, it can be easily replaced.

FIG. 3 shows the tubular main body 2 and the slide operation barrel 4 of the puncture device for an endoscope according to the second embodiment of the present invention. The second on the inner peripheral surface of
Are formed. Other parts are the same as those in the first embodiment.

In this manner, in a state where the slide operation tube 4 is pushed into the cylindrical main body 2 (ie, a state where the needle tip 3a protrudes from the distal end of the sheath 1, the first operation tube).
At the same time as the O-ring 11 is engaged with the first engagement groove 21, the second O-ring 12 is engaged with the second engagement groove 22, and the click force can be increased.

FIGS. 4 and 5 show the cylindrical main body 2 and the slide operation cylinder 4 of the endoscope puncture device according to the third and fourth embodiments of the present invention. O-ring mounting groove 13
Is formed shallow to increase the amount of protrusion of the first O-ring 11, and the depth of the engagement groove 21 is formed correspondingly deeper. In other respects, the third embodiment is the same as the first embodiment, and the fourth embodiment is the same as the second embodiment.

In this manner, the first O-ring 11 and the first O-ring 11 in a state where the slide operation cylinder 4 is pushed into the cylindrical main body 2 (that is, a state where the needle tip 3a projects from the distal end of the sheath 1). By increasing the engagement force with the first engagement groove 21, the click force can be increased.

The present invention is not limited to the above embodiment. For example, in order to optimally set the click force, the hardness and thickness of the first and second O-rings 11 and 12 are determined. They may be different.

[0035]

According to the present invention, a detachable click mechanism for elastically fixing the advance / retreat of the slide operation cylinder with respect to the cylindrical main body is provided on the outer peripheral surface of the slide operation cylinder. First and second O-rings made of material;
Since the slide operation cylinder is pulled out from the cylindrical main body, the wear state of the O-ring can be easily checked by forming the engagement groove formed on the inner peripheral surface of the cylindrical main body.
If the ring is worn or scratched, it can be easily replaced.

[Brief description of the drawings]

FIG. 1 is a half cross-sectional view of an endoscope puncture device according to a first embodiment of the present invention in a state where a needle tip protrudes.

FIG. 2 is a half sectional view of the puncture device for an endoscope according to the first embodiment of the present invention in a state where a needle tip is retracted.

FIG. 3 is a half sectional view of a puncture device for an endoscope according to a second embodiment of the present invention.

FIG. 4 is a half sectional view of an endoscope puncture device according to a third embodiment of the present invention.

FIG. 5 is a half sectional view of a puncture device for an endoscope according to a fourth embodiment of the present invention.

FIG. 6 is a half sectional view of a conventional endoscope puncture device in a state where a needle tip is projected.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sheath 2 Tubular main body 3 Flexible needle shaft 3a Needle tip 4 Slide operation cylinder 11,12 O-ring 13,14 O-ring mounting groove 21,22 Engagement groove

Claims (3)

[Claims] 1. A flexible sheath inserted into and removed from a treatment instrument insertion channel of an endoscope, a tubular main body connected to a proximal end of the sheath, and a total length in the sheath so as to be able to advance and retreat in an axial direction. A flexible needle shaft having a needle tip formed at the distal end thereof, and a slide operation tube connected to the base end of the flexible needle shaft and fitted to the cylindrical body so as to be able to advance and retreat in the axial direction. An endoscope puncturing device having a detachable click mechanism for elastically fixing the advance / retreat of the slide operation cylinder with respect to the cylindrical main body, wherein the click mechanism includes an outer peripheral surface of the slide operation cylinder. Formed by first and second O-rings made of a resilient material and attached to the inner peripheral surface of the tubular main body, and the needle point is set from the distal end of the sheath. When the first O-ring is in the extended state, The puncture device for an endoscope, wherein the second O-ring is engaged with the engagement groove when the needle tip is engaged with the groove and the needle tip is housed in the sheath. 2. The needle tip is stored in the sheath by the engagement between the engagement groove and the first O-ring performed when the needle tip protrudes from the distal end of the sheath. The puncture device for an endoscope according to claim 1, wherein an engagement force between the engagement groove and the second O-ring performed in the state is smaller. 3. A second engagement groove which engages with the second O-ring when the needle tip protrudes from the distal end of the sheath is formed on the inner peripheral surface of the cylindrical main body. The puncture device for an endoscope according to claim 1 or 2.