JP2001299689A - Endoscope biopsy forceps - Google Patents

Abstract

(57) [Problem] To provide a biopsy forceps for an endoscope which can collect a sufficient amount of a tissue sample only from a shallow position near a mucosal surface. A tip portion (51) of an edge of a forceps cup (5) is formed in a straight line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biopsy forceps for an endoscope, which is inserted into a forceps channel of an endoscope to collect a tissue sample from a body.

[0002]

2. Description of the Related Art In general, a biopsy forceps for an endoscope has a forceps cup having an edge formed in a blade shape, which is disposed at the tip of a sheath so as to be openable and closable in a beak shape, and is inserted into the sheath so as to be able to advance and retreat in the axial direction. The forceps cup is remotely opened and closed from the proximal side of the sheath via the disposed operation wire.

[0003]

FIG. 10 shows a state in which the affected tissue 100 on the mucous membrane surface in the body is excised and collected by the conventional biopsy forceps for an endoscope.
Each of the forceps cups 5 and 5 for excision and collection of 0 is formed in a shape obtained by extending a hemispherical cup in the longitudinal direction,
The edge of the tip is semicircular.

When the affected tissue 100 is excised and collected with the forceps cups 5 and 5 having such a shape, as shown in FIG. It is necessary to cut deep into the tissue.

However, when a small vocal cord polyp or the like is excised, there is a problem that if the tissue that vibrates for vocalization is excised, the person's voice will change. The amount of tissue was too small to obtain a useful specimen for testing.

Accordingly, an object of the present invention is to provide a biopsy forceps for an endoscope which can collect a sufficient amount of a tissue sample only from a shallow position near the mucosal surface.

[0007]

In order to achieve the above object, a biopsy forceps for an endoscope according to the present invention comprises a forceps cup having an edge formed in a blade shape and a tip of a sheath openable and closable in a beak shape. In the biopsy forceps for an endoscope in which the forceps cup is remotely opened and closed from the proximal side of the sheath via an operation wire that is inserted through the sheath so as to be able to advance and retreat in the axial direction.
The distal end portion of the edge of the forceps cup is formed in a straight line.

[0008] The linear portion of the edge of the forceps cup is
It may be oriented perpendicular to the axial direction of the distal end of the sheath, or may be oriented obliquely to the axial direction of the distal end of the sheath. Further, the width in the width direction of the forceps cup may be longer than the length in the vertical direction.

[0009]

Embodiments of the present invention will be described with reference to the drawings. FIG. 2 is a side sectional view of a distal end portion of the biopsy forceps for an endoscope according to the first embodiment of the present invention, and FIG. 1 is a plan sectional view thereof. However, FIG. 1 shows two intermediate rivets 63a, 63b and the like at positions not appearing in the original plan sectional view so that the structure can be easily understood.

Reference numeral 1 denotes a flexible sheath that is inserted into and removed from a forceps channel of an endoscope (not shown), and is formed by, for example, a coil pipe in which a stainless steel wire is tightly wound with a fixed diameter.

An operation wire 2 is inserted through the entire length of the flexible sheath 1 so as to be able to advance and retreat in the axial direction, and at an operation portion (not shown) connected to the proximal side of the flexible sheath 1. It is operated back and forth.

The distal end support frame 3 connected and fixed to the distal end of the flexible sheath 1 is formed with a slit 31 that is largely cut from the front side. And a pair of forceps cups 5
(5a, 5b) are supported by the support shaft 4 so as to open and close like a beak centering on the support shaft 4 attached near the distal end of the distal end support frame 3 so as to cross the slit 31.

In the slit 31, there is provided a link mechanism 6 for converting the advance / retreat operation of the operation wire 2 into the opening / closing operation of the forceps cup 5.
Is arranged. The link mechanism 6 is formed in a so-called pantograph shape, and each forceps cup 5 (5a, 5
The intermediate link plates 62a, 62b are attached to the link portions 61a, 61b integrally formed in FIG.
2b are connected.

The rear ends of the two intermediate link plates 62a and 62b are connected to the front end of a wire connection link 65 fixed to the front end of the operation wire 2 by rear rivets 64.

Each of the pair of forceps cups 5 (5a, 5b) is formed in a shape obtained by extending a hemispherical cup into an elliptical shape in both the left and right directions. Is parallel to the direction of the support shaft 4 (therefore,
(It is perpendicular to the axis of the distal end portion of the flexible sheath 1). As specific dimensions, for example, when the length A in the longitudinal direction of the forceps cup 5 is about 2 mm, the length B in the width direction is about 3 mm to 6 mm.

FIG. 3 shows a state in which the affected tissue 100 is excised and collected by the endoscope biopsy forceps of the embodiment configured as described above, and the forceps cup 5 is formed to be horizontally long. Since the distal end portion 51 of the edge of the forceps cup 5 is formed in a horizontal straight line, when the diseased tissue 100 is sandwiched by the forceps cup 5, as shown in FIG. A sufficient amount of tissue specimen can be collected in a wide width only from a shallow position near the mucosal surface without entering deeply from the surface.

The present invention is not limited to the above embodiment. For example, as in a second embodiment shown in FIG. 5, one forceps cup 5b is formed integrally with the distal end support frame 3. In addition, the present invention may be applied to a so-called single-opening type biopsy forceps for an endoscope in which only the other forceps cup 5a opens and closes in a beak shape around the support shaft 4.

Further, as in a third embodiment shown in FIG. 6, the distal end of the operation wire 2 is directly connected to link portions 61a, 61b formed integrally with the forceps cup 5 (5a, 5b). The forceps cup 5 may be driven to open and close.

The forceps cup 5 may be formed in a shape deviated in the left-right direction as shown in FIG. 7 according to the fourth embodiment shown in FIG. As in the fifth and sixth embodiments shown in FIG.
May be formed not parallel to the support shaft 4 but obliquely with respect to the axial direction of the distal end portion of the flexible sheath 1.

[0020]

According to the present invention, a sufficient amount of tissue specimen can be collected only from a shallow position near the mucous membrane surface by forming the distal end portion of the edge of the forceps cup in a straight line. In addition, small vocal fold polyps and the like can be removed and collected without causing a change in the patient's voice.

[Brief description of the drawings]

FIG. 1 is a plan sectional view of a distal end portion of an endoscope biopsy forceps according to a first embodiment of the present invention.

FIG. 2 is a side sectional view of a distal end portion of the endoscope biopsy forceps according to the first embodiment of the present invention.

FIG. 3 is a perspective view schematically showing a usage state of the endoscope biopsy forceps of the first embodiment of the present invention.

FIG. 4 is a schematic diagram showing a sample collection state by an endoscope biopsy forceps according to the first embodiment of the present invention.

FIG. 5 is a side sectional view of a distal end portion of an endoscope biopsy forceps according to a second embodiment of the present invention.

FIG. 6 is a side sectional view of a distal end portion of an endoscope biopsy forceps according to a third embodiment of the present invention.

FIG. 7 is a plan sectional view of a distal end portion of an endoscope biopsy forceps according to a fourth embodiment of the present invention.

FIG. 8 is a plan sectional view of a distal end portion of an endoscope biopsy forceps according to a fifth embodiment of the present invention.

FIG. 9 is a plan sectional view of a distal end portion of an endoscope biopsy forceps according to a sixth embodiment of the present invention.

FIG. 10 is a perspective view schematically showing a use state of a conventional endoscope biopsy forceps.

FIG. 11 is a schematic view of a state in which a sample is collected by a conventional endoscope biopsy forceps.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 flexible sheath 2 operation wire 4 support shaft 5 forceps cup 6 link mechanism 51 distal end portion of edge of forceps cup

Claims (4)

[Claims] 1. A forceps cup having an edge formed in a blade shape is disposed at the tip of a sheath so as to be openable and closable in a beak shape, and via an operation wire inserted through the sheath so as to be able to advance and retreat in the axial direction. In the biopsy forceps for an endoscope in which the forceps cup is remotely opened and closed from the proximal side of the sheath, a distal end portion of an edge of the forceps cup is linearly formed. Biopsy forceps for endoscopes. 2. The biopsy forceps for an endoscope according to claim 1, wherein a linear portion of an edge portion of the forceps cup faces in a direction perpendicular to an axial direction of a distal end portion of the sheath. 3. The biopsy forceps for an endoscope according to claim 1, wherein a linear portion of an edge portion of the forceps cup is obliquely oriented with respect to an axial direction of a distal end portion of the sheath. 4. The biopsy forceps for an endoscope according to claim 1, wherein the length in the width direction of the forceps cup is longer than the length in the vertical direction.