JP2001231782A - Tissue collector for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tissue collector for an endoscope which can be easily inserted into an implement insertion channel of the endoscope by pushing the collector from an operator side. SOLUTION: This tissue collector for a endoscope has a flexible needle shaft 10 which is formed with a needle tip 11 toward the front and is formed with a tissue housing recessed part 12 at the flank in the segment near this needle tip 11, and a flexible cannula 20 of a cylindrical sectional shape which is freely advanceably and retreatably fitted to the needle shaft 10 in its axial direction and is formed with a knife blade 21 for cutting off the tissue intruding into the tissue housing recessed part 12 at its tip end. The intermediate segment of the cannula 20 described above is cut off in a longitudinal direction to increase flexibility.

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 liver biopsy or 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 outer tube 20 fitted to the needle shaft 10 so as to be able to advance and retreat in the axial direction is formed into a cylindrical cross-sectional shape. Is formed.

[0004]

When the above-described tissue sampling tool is used in a flexible endoscope, the treatment tool insertion channel made of a synthetic resin, which is in a meandering state, is inserted into the channel.
The tissue collection tool must be pushed through from the near side.

However, since the mantle tube 20 is formed of a substantially hard material to form the blade 21, the sheath tube 20 has a high resistance when passing through the treatment instrument insertion channel, and in some cases, the needle tip 11 may not be treated. A hole may be made by piercing the tool insertion channel.

Accordingly, an object of the present invention is to provide a tissue sampling tool for an endoscope which can be easily inserted by being pushed into a treatment tool insertion channel of an endoscope from a hand side.

[0007]

In order to achieve the above object, the present invention provides an endoscopic tissue collecting tool having a tip formed forward and having a tissue on the side of a portion near the tip. A flexible needle shaft formed with a storage recess, and a cylindrical cross-sectional shape formed at the tip with a blade that is fitted to the needle shaft so as to be able to advance and retreat in the axial direction and cuts tissue that has entered the tissue storage recess. In the tissue sampling tool for an endoscope having a flexible outer tube, the middle portion of the outer tube is cut off in the longitudinal direction to increase flexibility.

[0008] The intermediate portion of the mantle tube may be cut at a plurality of locations at substantially equal intervals in the circumferential direction. Further, the intermediate portion of the mantle tube may be cut and divided into a plurality of pieces in the longitudinal direction intermittently, in which case, a plurality of cut and cut portions are provided with a phase change in the direction around the axis,
Further, the length, width or number may be changed.

[0009]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the overall configuration of a tissue sampling tool for an endoscope according to a first embodiment of the present invention.
Shows a state in which the tip of is pushed out to a predetermined tip position,
(B) has shown the state where the front-end | tip of the mantle tube 20 was pulled back backward.

At the tip of the needle shaft 10 having a circular cross section, a non-porous needle tip 11 which is pointed forward is formed, and a portion immediately behind the needle tip 11 is used for accommodating tissue. The tissue storage recess 12 is formed to open on the side surface of the needle shaft 10.

An outer tube 20 is fitted over the needle shaft 10 so as to be able to advance and retreat in the axial direction over substantially the entire length. Mantle tube 20
Is formed in a tapered tapered shape. As a result, the inner peripheral tip portion of the outer tube 20 is an annular blade 21.

The cross-sectional shape of the needle shaft 10 in the tissue accommodating recess 12 is shown in FIG.
One half is completely cut away, and the other half is formed in a substantially C-shaped cross-sectional shape, leaving an arc-shaped wall having a constant thickness along the outer circumference of the needle shaft 10, and is formed from the front side to the rear side. It is formed in an arc shape with a gradually increasing angle.

The needle shaft 10 and the mantle tube 20 are both flexible, so that flexibility can be obtained by using a thin stainless steel pipe, or a plastic material such as a polyimide resin can be used. It is.

By manipulating the mantle tube 20 at the hand side, the distal end portion of the mantle tube 20 completely covers the tissue accommodating recess 12 as shown in FIGS. 1A and 1B. The tissue that has moved back and forth with respect to the tissue storage recess 12 and has entered the tissue storage recess 12 can be cut off by the blade 21.

An operation part support 30 for supporting the operation part at hand side
A detachable connection base 31 is formed in the treatment instrument insertion port 94a of the treatment instrument insertion channel 94 of the endoscope.
The operation base support 30 is fixed to the operation section 92 of the endoscope by locking the connection base 31 to the treatment tool insertion port 94a.

A base end of an outer tube 20 is fixedly connected to a distal end portion of an outer tube operating tube 23 which is inserted into the cylindrical portion of the operating portion support 30 so as to be able to advance and retreat in the axial direction. The proximal end of the mantle tube operating tube 23 protrudes from the operating portion support 30 toward the proximal side, and can be manually moved in the axial direction.

A base end of the needle shaft 10 is fixedly connected to a distal end portion of the needle shaft operation tube 14 inserted into the mantle tube operation tube 23. The needle shaft operation tube 14 is independently movable in the axial direction with respect to the mantle tube operation tube 23, and the hand shaft end of the needle shaft operation tube 14 protruding from the mantle tube operation tube 23 toward the hand side includes:
A suction connection base 15 is provided in communication with the suction path 13.

An external suction tool 50 is connected to the suction connection base 15, and by operating the suction tool 50 to open the cock 51, the tissue storage formed at the distal end of the needle shaft 10 via the suction path 13 is stored. Suction can be performed from the recess 12.

A screw rod 16 protruding from the needle shaft operating cylinder 14 at a position near the suction connection base 15 is disposed so as to penetrate through a long groove 32 formed in the rail portion of the operating portion support 30. A manual nut 17 is screwed into the screw rod 16 from the outside.

Therefore, by tightening the manual nut 17 at an arbitrary position where the needle shaft operating cylinder 14 is moved in the axial direction, the needle tip 11 of the needle shaft 10 is moved from the distal end of the treatment instrument insertion channel 94 to an arbitrary length. It can be fixed in a protruded state.

A compression coil spring 2 is provided between the proximal end of the mantle tube operating barrel 23 and the proximal end of the needle shaft operating barrel 14.
4 is mounted, and when the operator does not apply any external force, the mantle tube 20 is pushed forward by the biasing force of the compression coil spring 24 (A).

If the mantle tube operating cylinder 23 is pulled toward the hand against the urging force of the compression coil spring 24,
In a state (B) in which the mantle tube 20 is drawn toward the hand side, if the hand is released from the mantle tube operating tube 23 in this state, the mantle tube 20 is instantaneously moved to the distal side by the urging force of the compression coil spring 24. And the blade 21 passes through the surface of the tissue accommodating recess 12 and returns to the state shown in FIG.

The outer tube 20 of the endoscope tissue collecting tool thus constituted is formed of a pipe material having a cylindrical cross-sectional shape, and an intermediate portion thereof is a diagram showing a cross section taken along the line III-III. As shown in FIG. 3, it is cut in the longitudinal direction to form a shape in which a stay portion 22 parallel to the axis is left.

In this embodiment, the mantle tube 20 is cut at two locations at approximately 180 ° intervals, and the two stay portions 22 are at approximately 180 ° symmetrical positions. However, as shown in FIG. 4, the stay portions 22 may be left substantially symmetrically at three or more places. By forming the mantle tube 20 in such a shape, the flexibility of the endoscope tissue sampling tool is increased.

As a result, as shown in FIG.
When the tissue collecting tool for an endoscope in a state where the outer tube 20 is fitted to the endoscope 0 is inserted into the treatment tool insertion channel 94 of the endoscope 90 from the treatment tool insertion port 94a, the insertion of the endoscope 90 is performed. Even when the portion 91 and the curved portion 93 are bent with a small radius of curvature, the insertion resistance is small, and the tissue sampling tool for an endoscope can easily pass through the treatment tool insertion channel 94. It can be made to protrude from the treatment tool protruding port 94b without being damaged.

In this embodiment, the outer tube 20 is cut out over substantially the entire length except for the front and rear ends to form a stay portion 22. In the endoscope 90 inserted into the large intestine, the insertion portion 91 can be bent with a small radius of curvature to the vicinity of the base end.

However, depending on the use site, the curved portion 93
It is sufficient to form the stay portion 22 only in the portion passing through the inside or in the range of several tens of centimeters near the tip, so the range of the stay portion 22 may be set accordingly.

FIGS. 6 to 9 show the use state of the above-mentioned tissue collecting tool for an endoscope. First, as shown in FIG. 6, the tissue accommodating recess 12 is closed by the outer tube 20. The distal end of the mantle tube 20 is set near the distal end of the needle shaft 10, and the needle tip 11 pierces the tissue 100.

When the tissue accommodating concave portion 12 has been inserted to the predetermined position, the needle shaft 10 is fixed by tightening the manual nut 17, and the mantle tube operating tube 23 is pulled toward the user. Then, as shown in FIG. 7, the mantle tube 20 is pulled toward the hand side to expose the tissue storage recess 12, and the tissue 1
00 enters the tissue storage recess 12.

Then, the suction device 50 is operated to operate the suction passage 1.
When 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.

When the user releases the mantle tube operating tube 23 in this state, the mantle tube 20 is pushed forward by the urging force of the compression coil spring 24 as shown in FIG. From tissue 100 to specimen tissue 101
Is cut out, and as shown in FIG.
1 is housed in the tissue housing recess 12.

The present invention is not limited to the above embodiment. For example, as shown in FIG.
The intermediate portion of 0 may be cut into plural pieces in the longitudinal direction intermittently, and the stay portion 22 may be formed into plural pieces in the axial direction.

With this configuration, the state in which the outer tube 20 is fitted on the needle shaft 10 is maintained in the middle of the annular portion 22a, so that the outer tube 20 smoothly moves forward and backward.

Further, as shown in FIG.
Stay part 22 formed in a plurality in the longitudinal direction
May be sequentially changed as appropriate in the direction around the axis.
Further, the position, length, width, number, and the like of the stay portions 22 may be appropriately changed. With such a configuration, a mantle tube 20 having flexibility with arbitrary characteristics can be obtained.

[0035]

According to the present invention, the middle portion of the outer tube having a cylindrical cross section is cut in the longitudinal direction to increase the flexibility, so that the tissue sampling tool can be inserted into the treatment instrument of the endoscope. When pushing into the channel from the hand side and inserting it, even if the insertion part or bending part of the endoscope is bent with a small radius of curvature, the insertion resistance is small, and it is easy without damaging the treatment tool insertion channel Can be passed.

[Brief description of the drawings]

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

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view showing a modified example of a section taken along line III-III in FIG. 1;

FIG. 5 is a schematic view showing a state in which the tissue sampling tool for an endoscope according to the first embodiment of the present invention is inserted into a treatment instrument insertion channel of the endoscope.

FIG. 6 is a side sectional view of a distal end portion of the tissue sampling tool for an endoscope according to the first 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 first embodiment of the present invention in use.

FIG. 8 is a side cross-sectional view of the distal end portion of the endoscope tissue sampling tool according to the first embodiment of the present invention in use.

FIG. 9 is a side sectional view of a distal end portion of the endoscope tissue sampling tool according to the first embodiment of the present invention in a used state.

FIG. 10 is a partial side view of a mantle tube according to a second embodiment of the present invention.

FIG. 11 is a partial side view of a mantle tube according to a third 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]

 DESCRIPTION OF SYMBOLS 10 Needle shaft 11 Needle tip 12 Tissue storage recess 20 Mantle tube 21 Blade 22 Stay part

Claims (5)

[Claims] 1. A flexible needle shaft having a needle tip formed forward and a tissue storage recess formed on a side surface of a portion near the needle tip, and a needle shaft movably and reciprocally in the axial direction. A tissue collecting tool for an endoscope having a cylindrical, cross-sectionally-shaped flexible mantle tube formed at its tip with a blade for cutting the tissue that has been fitted and has entered the tissue storage recess. A tissue collecting tool for an endoscope, wherein the flexibility is increased by cutting off a middle portion of the tissue in the longitudinal direction. 2. The endoscope tissue sampling tool according to claim 1, wherein an intermediate portion of the mantle tube is cut at a plurality of locations at substantially equal intervals in a circumferential direction. 3. The endoscopic tissue sampling tool according to claim 1, wherein the intermediate portion of the mantle tube is cut off in a plurality of portions in the longitudinal direction. 4. The tissue sampling tool for an endoscope according to claim 3, wherein the plurality of cut-off portions are provided so as to change phases in a direction around an axis. 5. The tissue sampling tool for an endoscope according to claim 3, wherein the plurality of cut-off portions are provided with varying lengths, widths, or numbers.