JP2001120556A - Tissue picking tool for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tissue picking tool for an endoscope capable of safely and quickly picking a specimen tissue even if it is used for either of hard and soft endoscopes. SOLUTION: A base end part of a needle shaft 10 and a base end part of a sleeve tube 20 engage with each other, and a fixing member 50 is arranged so as to be freely fixable to and releasable from an inlet part 4a of a treating tool insering channel of an endoscope.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tissue sampling tool for an endoscope which is inserted into and removed from a treatment tool insertion channel of an endoscope and used for performing a pancreatic biopsy, a liver biopsy and the like.

[0002]

2. Description of the Related Art FIG. 12 shows a tip portion of a so-called Menghini tissue sampling needle used as a conventional tissue sampling tool for an endoscope. Are formed, and a tissue storage recess 12 for storing the cut sample tissue is formed in a shape in which the vicinity of the needle tip 11 is recessed from the side surface.

[0003] An annular blade 21 is formed on the inner peripheral side of the distal end of a mantle tube 20 fitted on the needle shaft 10 so as to be able to advance and retreat in the axial direction. ing.

[0004]

As described above, the conventional Menghini tissue collecting needle has a structure in which the needle shaft and the mantle tube are simply combined, and is used through a rigid endoscope. .

However, when the insertion portion is inserted into the treatment instrument insertion channel of a so-called flexible endoscope having flexibility, frictional resistance in the meandering treatment instrument insertion channel becomes extremely large. It is difficult to operate the needle shaft and the mantle tube independently and delicately independently, and it was not possible to perform safe and quick tissue collection.

Accordingly, an object of the present invention is to provide a tissue collecting tool for an endoscope which can safely and quickly collect a sample tissue even when used for both a hard endoscope and a soft endoscope.

[0007]

In order to achieve the above object, the endoscope tissue collecting tool of the present invention has a needle tip formed forward, and a portion near the needle tip is depressed from the side. A needle shaft having a tissue storage recess having a shape formed therein, and an outer tube having a blade formed at the tip for cutting off the tissue that has been fitted to the needle shaft so as to be able to advance and retreat in the axial direction and has entered the tissue storage recess. In a tissue sampling tool for an endoscope, a base member of a needle shaft and a base end of a mantle tube are engaged with each other, and a fixing member is provided which can be fixed / released with respect to an entrance portion of a treatment instrument insertion channel of the endoscope. It is a thing.

The needle shaft and the mantle tube may each have flexibility, and the base end of the needle shaft is locked by a fixing member, and the fixing member is positioned with respect to the entrance of the treatment instrument insertion channel. It is preferable that the tip of the needle shaft protrudes from the outlet of the treatment instrument insertion channel by a predetermined length when the needle shaft is fixed.

[0009] The base end of the mantle tube may be detachable from the fixing member independently of the needle shaft, and a biasing member for pushing the mantle tube in the axial direction is provided on the fixing member. However, when the locked state of the mantle tube with respect to the fixing member is released, the mantle tube may be pushed out in the axial direction by the biasing member.

[0010] A portion where the needle shaft and the outer tube engage with the portion of the fixing member fixed to the entrance portion of the treatment instrument insertion channel can be freely fixed / released. The shaft and the mantle tube may be made to be able to advance and retreat in the axial direction integrally, and a suction path may be provided that communicates with the tissue storage recess on the distal end side and reaches the base end side of the needle shaft. .

[0011]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the entire configuration of a tissue sampling tool for an endoscope. With respect to the distal end portion, a state (A) in which the mantle tube 20 is pulled toward the hand side, and the mantle tube 20 is pushed out to a predetermined front end position. (B) is shown separately.

At the tip of the needle shaft 10, a non-porous needle tip 11 that is pointed forward is formed, and a tissue storage recess 12 for storing tissue is provided immediately after the needle tip 11. , II
As shown also in FIG.
0 is cut out from the side surface to form a concave shape.

A suction passage 13 communicating with the tissue storage recess 12 is formed in the needle shaft 10 behind the tissue storage recess 12 over the entire length. Therefore, the portion of the needle shaft 10 behind the tissue storage recess 12 is formed in a pipe shape. A groove 14 is formed slightly behind the tissue storage recess 12 so that a rod or the like for pushing out the sample tissue 101 collected therein can be inserted.

The needle shaft 10 may be formed of a plastic material having flexibility. However, if the pipe-like portion is made thin, even if it is made of stainless steel or the like, it can be inserted into a flexible endoscope as much as possible. Can be obtained.

An outer tube 20 is fitted on the needle shaft 10 so as to be able to advance and retreat in the axial direction. The distal end of the outer tube 20 formed in a thin cylindrical shape is formed in a tapered shape,
As a result, the inner peripheral tip portion of the outer tube 20 is an annular blade 21.

The outer tube 20 is formed by a tightly wound coil pipe 20a except for the vicinity of the distal end so that a large resistance is not generated when the outer tube 20 is inserted into and removed from the flexible endoscope. Is connected to a connecting ring 20b.

Reference numeral 50 denotes an operation unit (fixing member) provided on the hand side of the tissue sampling tool. A pedestal section 51 formed in a substantially cylindrical shape is provided at an entrance portion of a treatment tool insertion channel of an endoscope. An attachment base 52 that can be fixed / released is formed. The mounting base 52 is formed in, for example, a so-called luer lock female base.

A base end holding portion 53 is fitted to the pedestal portion 51 so as to be able to advance and retreat in the axial direction, and the two can be arbitrarily fixed / released by a manual lock screw 54. The lock screw 54 is passed through a long groove 55 formed in the pedestal portion 51 in parallel with the axis and is screwed with the base holding portion 53. The part 53 can be moved forward and backward with respect to the pedestal part 51.

A suction connection base 57 connected to a suction tool is detachably attached to the proximal end of the base end holding section 53 by screwing, and the base end of the needle shaft 10 is connected to the suction connection base 57. Is fixedly connected to. Therefore, by attaching a suction tool to the suction connection base 57, suction can be performed from the tissue storage recess 12 through the suction path 13 of the needle shaft 10.

The suction connection base 57 is connected to the base end holding section 53.
In the state where the needle shaft 10 is screwed into the base end holding portion 53, the needle shaft 10 is locked and fixed to the base end holding portion 53.
3 is unscrewed from the suction connection base 57, the needle shaft 10
Becomes independent of the hand operation unit 50 in the axial direction.

The base end of the coil pipe 20a of the mantle tube 20 is fixedly connected to the front end of the mantle tube holding cylinder 58 disposed inside the base end holding portion 53 so as to be able to advance and retreat in the axial direction. . The needle shaft 10 is disposed in a through hole formed at an axial position of the outer tube holding cylinder 58 so as to pass loosely.

The mantle tube holding cylinder 58 is urged forward by a compression coil spring 59, and a hook 60 for holding the mantle tube holding cylinder 58 with the compression coil spring 59 compressed is rotated. The operation knob 62 is attached to the base holding portion 53 so as to be rotatable about a shaft 61.

Therefore, when the outer tube holding cylinder 58 is held by the hook 60 as shown in FIG.
As shown in (2), the mantle tube 20 is drawn to the proximal side and does not cover the tissue storage recess 12.

When the operation knob 62 is operated in the direction indicated by the arrow to remove the hook 60 from the mantle tube holding cylinder 58, the mantle tube holding cylinder 5 is compressed by the compression coil spring 59.
8 moves by being pushed to the front side.

As a result, the mantle tube 20 is pushed out to a predetermined frontmost position, and the blade 21 slides on the surface of the tissue accommodating recess 12 to move forward, and the surface of the tissue accommodating recess 12 is closed by the mantle tube 20. The state shown in FIG. 6
Reference numeral 3 denotes a return knob for returning the mantle tube holding cylinder 58 to a position where it is engaged with the hook 60.

When this endoscope tissue sampling tool is used for a flexible endoscope, a needle shaft is placed in a guide tube 30 made of a tetrafluoroethylene resin tube or the like having a base end connected to a base 51. 10 and loosely insert the mantle tube 20 to the tip,
In this state, it is inserted into the treatment tool insertion channel of the endoscope.
By doing so, the treatment instrument insertion channel can be used without damaging the needle tip 11.

However, if the distal end of the mantle tube 20 is configured to be slidable to a position where it covers the needle tip 11 of the needle shaft 10, the flexible endoscope can be used without damaging the treatment instrument insertion channel without using the guide tube 30. Can be used for mirrors.

FIG. 2 shows a state in which the tissue sampling tool for an endoscope according to the above embodiment is attached to the flexible endoscope 1 at the time of use. 2 is an insertion part which is covered with a flexible tube, 3
Denotes an endoscope operation unit, and 4 denotes a treatment tool insertion channel.

A pedestal portion 51 is attached to the insertion base 4a of the treatment instrument insertion channel 4 protruding from the endoscope operation section 3. In this state, the treatment instrument inserted at the distal end of the insertion section 2 is inserted. The distal end of the guide tube 30 (and the distal ends of the mantle tube 20 and the needle shaft 10) protrude from the outlet 4b of the channel 4 by a predetermined length.

FIG. 2 shows a state in which the lock screw 54 is fixed with the distal end of the mantle tube 20 and the needle tip 11 of the needle shaft 10 protruding from the distal end of the guide tube 30. The suction connection base 57 is provided with a suction tool 7 such as a syringe.
0 is attached.

FIGS. 4 to 7 show a state in which a biopsy tissue such as a liver or a pancreas is collected by the endoscope tissue collecting tool of the above embodiment. Omitted.

First, the hook 60 is released so that the tissue storage recess 12 is closed by the distal end of the mantle tube 20 without fixing the hand-side operation unit 50 to the endoscope 1.
Then, the needle shaft 10 and the mantle tube 20 are integrated with the hand operation unit 50, and the needle tip 1 protruding from the distal end of the insertion unit 2 of the endoscope 1.
1 is inserted into the tissue 100 as shown in FIG.

When the needle tip 11 is pierced by a predetermined length, the mounting base 52 is fixed to the endoscope operation section 3, the return knob 63 is pulled up, and the outer tube holding cylinder 58 is locked by the hook 60.
The mantle tube 20 is pulled toward the user, and the tissue accommodating recess 12 is exposed as shown in FIG.
00 enters the tissue storage recess 12.

Then, the suction device 70 is actuated and the suction path 1
When the suction is performed from the tissue storage recess 12 through 3, the tissue 100 that becomes the sample tissue 101 is sucked into the tissue storage recess 12 as shown in FIG. 6 and further into the suction passage 13 near the entrance. Inhaled.

In this state, when the operation knob 62 is operated to release the hook 60, as shown in FIG. 7, the mantle tube 20 is immediately pushed into the front side, and the specimen tissue 101 is moved to the blade of the mantle tube 20. The tissue 21 is cut off from the tissue 100 by the 21 and is housed in the tissue housing recess 12.

In this manner, the sample tissue 101 larger than the volume of the tissue storage recess 12 can be easily collected. After the collection, the needle shaft 10 is pulled out from the operation unit 50 at hand, and a thin rod or the like is inserted into the groove 14 to insert the specimen tissue 10.
1 can be pushed out of the tissue storage recess 12 and taken out.

The present invention is not limited to the above embodiment. For example, as shown in FIG. By doing so, the strength can be increased, or as shown in FIG.

Further, as shown in FIG.
A separate component may be attached to the needle tip 11 using a pipe material as the material of the needle, and as shown in FIG. 11, the tip may be formed by cutting the tip of the pipe material obliquely as it is. .

[0039]

According to the present invention, the base end of the needle shaft and the base end of the outer tube are engaged, and the fixed end can be fixed / releasably fixed to the entrance of the treatment instrument insertion channel of the endoscope. By providing the member, it is possible to cut out the sample tissue by operating the mantle tube with the needle shaft piercing the tissue fixed to the endoscope, so that it can be inserted into the meandering treatment instrument insertion channel. The needle shaft and the mantle tube can be individually and subtly advanced and retracted independently, and the sample tissue can be collected safely and quickly even when used for both a hard endoscope and a soft endoscope.

[Brief description of the drawings]

FIG. 1 is a side cross-sectional view showing an entire configuration of a tissue sampling tool for an endoscope according to an embodiment of the present invention.

FIG. 2 is an external view of a state in which the tissue sampling tool for an endoscope according to the embodiment of the present invention is attached to a flexible endoscope.

FIG. 3 is a sectional view taken along the line III-III in FIG. 1 of the embodiment of the present invention.

FIG. 4 is a side cross-sectional view of a distal end portion of the endoscope tissue collecting tool according to the embodiment of the present invention in use.

FIG. 5 is a side cross-sectional view of a distal end portion of the endoscope tissue sampling tool according to the embodiment of the present invention in use.

FIG. 6 is a side cross-sectional view of a distal end portion of the endoscope tissue collecting tool according to the embodiment of the present invention in use.

FIG. 7 is a side sectional view of a distal end portion of the tissue sampling tool for an endoscope according to the embodiment of the present invention in use.

FIG. 8 is a sectional view showing a first modification of the section taken along the line III-III in FIG. 1;

FIG. 9 is a sectional view showing a second modification of the section taken along the line III-III in FIG. 1;

FIG. 10 is a side sectional view showing a first modified example of the distal end portion of the tissue sampling tool for an endoscope according to the embodiment of the present invention.

FIG. 11 is a side sectional view showing a second modification of the distal end portion of the tissue sampling tool for an endoscope according to the embodiment of the present invention.

FIG. 12 is a side sectional view of a distal end portion of a conventional endoscope tissue sampling tool.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 needle shaft 11 needle tip 12 tissue storage recess 13 suction path 20 mantle tube 21 blade 50 hand operation part (fixing member) 51 pedestal part 52 mounting base 53 base end holding part 54 lock screw 57 suction connection base 58 mantle tube holding cylinder 59 compression Coil spring 60 Hook 62 Operation knob 70 Suction tool 101 Sample tissue

Claims (7)

[Claims] 1. A needle shaft having a needle tip formed forward and a tissue storage recess formed in a shape in which a portion near the needle tip is recessed from a side surface, and a needle shaft movably and axially retractable on the needle shaft. A tissue collecting tool for an endoscope having a mantle tube having a blade formed at a distal end thereof for cutting out a tissue fitted and entering the tissue storage recess, wherein a base end of the needle shaft and a base end of the mantle tube And is fixed to the entrance portion of the treatment instrument insertion channel of the endoscope.
A tissue sampling tool for an endoscope, comprising a releasable fixing member. 2. The tissue sampling tool for an endoscope according to claim 1, wherein said needle shaft and said outer tube each have flexibility. 3. When the base end of the needle shaft is locked to the fixing member and the fixing member is fixed to the entrance of the treatment instrument insertion channel, the distal end of the needle shaft is The tissue sampling tool for an endoscope according to claim 1 or 2, wherein the tool projects from the outlet of the treatment tool insertion channel by a predetermined length. 4. The device according to claim 1, wherein a base end portion of the mantle tube is detachable from the fixing member independently of the needle shaft.
4. The tissue sampling tool for an endoscope according to 2 or 3. 5. An urging member for pushing the mantle tube in the axial direction is provided on the fixing member, and when the locking state of the mantle tube with respect to the fixing member is released, the mantle tube is axially moved by the urging member. The tissue sampling tool for an endoscope according to claim 4, which is extruded in a direction. 6. A portion in which said needle shaft and outer tube engage with a portion of said fixing member which is fixed to an entrance portion of said treatment instrument insertion channel, can be freely fixed / released, and is in a released state. Wherein the needle shaft and the mantle tube can be integrally advanced and retracted in the axial direction.
6. The endoscope tissue sampling tool according to 3, 4, or 5. 7. The endoscope according to claim 1, wherein a suction path is provided at a distal end side of the needle shaft so as to communicate with the tissue accommodating concave portion and reach a proximal end side of the needle shaft. Tissue collection tool.