JP4459334B2 - Endoscopic biopsy forceps - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an endoscopic biopsy forceps that is inserted into a forceps channel of an endoscope and used to collect a biopsy tissue specimen from within a body cavity.
[0002]
[Prior art]
Endoscopic biopsy forceps generally have a forceps cup and a drive lever that are integrally formed on the distal end side of the sheath, and a drive lever that moves forward and backward in the axial direction through an operation wire that is inserted into the sheath. The forceps cup is driven to open and close like a bowl by rotating around the support shaft.
[0003]
Such an integrated part of the forceps cup and the drive lever was previously formed by cutting from a stainless steel bar or the like. However, since the cost of the parts is significantly high, it is formed by pressing from a plate material. (Japanese Patent Laid-Open Nos. 9-276285 and 10-24045).
[0004]
FIG. 6 shows an integral part of a forceps cup 7 and a drive lever 8 of a conventional endoscopic biopsy forceps by such press working, and FIG. 7 shows a boundary portion between the forceps cup 7 portion and the drive lever 8 portion. 9 shows a structure in which the drive lever 8 portion and the boundary portion 9 have a structure in which a metal plate material is folded and brought into close contact.
[0005]
[Problems to be solved by the invention]
When the pair of forceps cups 7 is engaged with the mucosal tissue of a living body during use, a large force acts on the forceps cup 7 in an irregular direction, and the concentrated stress is a boundary portion 9 that is the neck of the forceps cup 7. Act on.
[0006]
Then, since the boundary portion 9 of the structure in which the metal plate material of the material is folded and adhered as described above is weak against the bending force in the lateral direction, the boundary portion 9 bends in the lateral direction indicated by the arrow A in FIG. There is a case where the forceps cup 7 is deformed into a state where the head is swung horizontally.
[0007]
Therefore, the present invention can be manufactured at a low cost by integrally forming the forceps cup and the drive lever by press working, and the boundary portion between the forceps cup and the drive lever is resistant to lateral bending and is not easily deformed. An object of the present invention is to provide an endoscopic biopsy forceps having excellent properties.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, an endoscopic biopsy forceps according to the present invention is a sheath in which a forceps cup and a drive lever, which are integrally formed by pressing, are rotatable around a support shaft in the vicinity of a boundary portion thereof. The forceps cup and drive lever rotate around the support shaft by operating the operation wire supported by the tip of the wire and inserted and placed in the sheath in the axial direction, so that the forceps cup is opened and closed in a hook shape. In the endoscopic biopsy forceps configured as described above, the boundary portion between the forceps cup and the drive lever has a plurality of plate-like members arranged in parallel at intervals, and each of the plate-like members is It is supported so as to be rotatable about a support shaft.
[0009]
The drive lever may be formed by extending one of the plurality of plate-like members constituting the boundary portion rearward, and the drive lever may be formed in a substantially U-shaped cross-sectional shape.
[0010]
Further, the support shaft may be attached to a support frame provided at the distal end of the sheath, and a plurality of plate-like members constituting the boundary portion may be located separately on the inner side and the outer side of the support frame, In this case, the drive lever may be disposed inside the support frame.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
1 and 2 show a distal end portion of an endoscopic biopsy forceps, FIG. 1 is a plan sectional view, and FIG. 2 is a side sectional view. However, in both figures, different cross sections are shown in a complex manner so that the structure can be explained with a small number of drawings.
[0012]
A flexible sheath 1 to be inserted into and removed from a forceps channel of an endoscope (not shown) is composed of a closely wound coil pipe formed by closely winding a stainless steel wire with a certain diameter, for example.
[0013]
However, the sheath 1 may have a tightly wound coil pipe covered with a flexible tube or other configurations, and the length is about 1 to 2.5 m and the diameter is about 1.5 to 3 mm, for example.
[0014]
An operation wire 2 is inserted through the entire length of the sheath 1 so as to be movable forward and backward in the axial direction. The operation wire 2 is operated by an operation from an operation portion (not shown) connected to the proximal end side of the sheath 1. Advancing / retreating
[0015]
In this embodiment, the two operation wires 2 are inserted into the sheath 1 in a state where the two operation wires 2 are arranged and passed through a single flexible tube 21 made of, for example, a tetrafluoroethylene resin. In the vicinity of the distal end of the tube 21, the two operation wires 2 are integrally fixed by a fixing ring 22 for preventing relative displacement.
[0016]
A support body 3 is fixedly connected to the distal end of the sheath 1. The support body 3 is configured by fixing a support frame portion 32 formed in a U-shape to the front side of an annular connection portion 31 connected to the distal end of the sheath 1.
[0017]
The annular connecting portion 31 of this embodiment is configured such that a spiral unevenness that is screwed to the outer periphery of the distal end of the sheath 1 is formed on a cap-like member, and the support frame portion 32 is formed by replacing a plate-like member with a U shape. The rear end portion is fixed to the annular connecting portion 31 with its open portion facing forward and bent in a shape. A through-hole through which the operation wire 2 passes loosely is formed at the central axis position of the connection fixing portion between the annular connection portion 31 and the support frame portion 32.
[0018]
Near the tip of the support body 3 (that is, near the tip of the support frame portion 32), a support bearing hole 4 is drilled in a direction perpendicular to the axial direction, and the support shaft 5 is rotatably passed therethrough. Yes.
[0019]
Two sets of members, in which the forceps cup 7 and the drive lever 8 are integrally formed, are supported so as to be rotatable about the support shaft 5. The pair of forceps cups 7 face each other with their open surfaces facing each other. In this state, it is arranged at a position protruding forward from the support body 3.
[0020]
The drive lever 8 is movably accommodated in the groove 32 a of the U-shaped support frame portion 32. The support shaft 5 having both ends held by the support body 3 is passed through a shaft hole 11 formed near the boundary portion 9 between the forceps cup 7 and the drive lever 8, and the drive lever 8 moves the support shaft 5. By rotating to the center, the forceps cup 7 formed integrally with the drive lever 8 opens and closes like a hook. FIG. 3 shows a state where the forceps cup 7 is opened.
[0021]
The forceps cup 7 and the drive lever 8 are formed by pressing a single stainless steel plate as a raw material. FIG. 4 shows a perspective view of the component itself, and FIG. ing.
[0022]
The forceps cup 7 and the drive lever 8 are formed in a short spoon shape as a whole. The forceps cup 7 has a hemispherical shape with a hole 7a formed in the back portion, and a blade is formed at the edge of the open surface.
[0023]
In the boundary portion 9 between the forceps cup 7 and the drive lever 8, as shown in FIG. 5 showing a VV cross section, two plate-like members 10a and 10b arranged to face each other with a space therebetween in parallel. The shaft hole 11 is drilled straight in both of them. The cross-sectional shape of the boundary portion 9 is basically U-shaped, but is cut out so as not to interfere with the support frame 32 when it rotates about the support shaft 5.
[0024]
Of the two plate-like members 10a and 10b forming the boundary portion 9, the inner plate-like member 10a is extended rearward as it is to form the drive lever 8. In the drive lever 8 portion, the plate-like member 10a is bent into a substantially U-shaped cross-sectional shape, and the plate-like members face each other at a narrower interval than the boundary portion 9 portion.
[0025]
The two plate-like members 10a and 10b forming the boundary portion 9 are separated from the inner side and the outer side of the support frame 32 and are supported so as to be rotatable about the support shaft 5. The plate-like member 10 a is in sliding contact with the inner plate-like member 10 a of the other forceps cup 7 on the bisector of the support frame 32, and the outer plate-like member 10 b is in sliding contact with the outer surface of the support frame 32. .
[0026]
A plurality of plate-like members 10a and 10b, which are arranged in parallel at such a distance in the boundary portion 9 between the forceps cup 7 and the drive lever 8 and are supported so as to be rotatable around the support shaft 5, are provided. By providing, the boundary portion 9 has a very excellent strength against deformation in the lateral direction A.
[0027]
The distal end portions of the two operation wires 2 are fixed to a grommet 20 that is rotatably attached to a hole (a hole indicated by a reference numeral 19 in FIG. 4) formed in the vicinity of the rear end of the drive lever 8.
[0028]
With such a configuration, when the operation wire 2 is moved forward and backward from the hand side, the drive lever 8 rotates about the support shaft 5 and the forceps cup 7 opens and closes in a hook shape. Can be taken between the pair of forceps cups 7 and collected in the forceps cup 7 so as to bite. As a result, a larger amount of tissue can be collected than in the past.
[0029]
And even if a large force acts on the forceps cup 7 in an irregular direction and the concentrated stress acts on the boundary portion 9 which is the neck portion of the forceps cup 7, the boundary portion 9 has an excellent strength in the lateral direction A. Therefore, it does not deform easily.
[0030]
The present invention is not limited to the above-described embodiment. For example, a link mechanism may be interposed between the drive lever 8 and the operation wire 2 to open and close the forceps cup 7. 7 may have any shape such as a shed.
[0031]
【The invention's effect】
According to the present invention, the forceps cup and the drive lever are integrally formed by pressing, so that it can be manufactured at a low cost, and is arranged in parallel at a boundary portion between the forceps cup and the drive lever. By providing a plurality of plate-like members each supported rotatably on the support shaft, the boundary portion corresponding to the neck portion of the forceps cup is resistant to lateral bending and is not easily deformed, and has excellent durability. it can.
[Brief description of the drawings]
FIG. 1 is a plan composite sectional view of a distal end portion in a state in which an endoscopic biopsy forceps according to an embodiment of the present invention is closed.
FIG. 2 is a side cross-sectional view of the distal end portion of the endoscope biopsy forceps in the closed state according to the embodiment of the present invention.
FIG. 3 is a side partial cross-sectional view of a distal end portion in a state where an endoscopic biopsy forceps according to an embodiment of the present invention is opened.
FIG. 4 is a perspective view of a member in which a forceps cup and a drive lever of an endoscopic biopsy forceps according to an embodiment of the present invention are integrally formed.
5 is a cross-sectional view (a VV cross-sectional view in FIG. 4) of a boundary portion between a forceps cup and a drive lever of an endoscopic biopsy forceps according to an embodiment of the present invention.
FIG. 6 is a partial plan view of a conventional endoscopic biopsy forceps.
FIG. 7 is a partially enlarged cross-sectional view of a conventional endoscopic biopsy forceps.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sheath 2 Operation wire 5 Support shaft 7 Forceps cup 8 Drive lever 9 Boundary part 10a Inner plate-like member 10b Outer plate-like member 11 Shaft hole

Claims (4)

By pressing and the drive lever and the forcep cups which are integrally formed, the rotatably around a support shaft in the boundary vicinity portion, is two sets supported by the supporting frame provided at the end portion of the sheath, the sheath an insertion placed operation wire within by advancing and retracting operation in axial direction and moving the lever driving with the two pairs of forceps cup rotates around the support shaft, the two pairs of forceps cups to beak In the endoscopic biopsy forceps that is driven to open and close,
Each of the boundary portions between the two pairs of forceps cups and the drive levers includes two plate- like members arranged in parallel at an interval in the axial direction of the support shaft ,
The two plate-like members provided for each of the boundary portions are separately located on the inner side and the outer side of the support frame, and are supported so as to be rotatable about the support shafts. Of the two plate-like members of the part, the plate-like members located on the inside of the support frame body are in sliding contact with each other on the bisector of the support frame body, and the one located on the outside of the support frame body An endoscopic biopsy forceps, wherein the plate-like member is disposed in a state of slidingly contacting the outer surface of the support frame . The endoscopic biopsy forceps according to claim 1, wherein the drive lever is formed by extending one of a plurality of plate-like members constituting the boundary portion rearward. The biopsy forceps for an endoscope according to claim 1 or 2, wherein the drive lever is formed in a substantially U-shaped cross-sectional shape. The endoscopic biopsy forceps according to claim 1, 2, or 3, wherein a distal end of the operation wire is connected to each of the drive levers .

Images