JP4554769B2 - 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 collects a tissue specimen from the body.
[0002]
[Prior art]
Endoscopic biopsy forceps generally support a pair of forceps cups whose edges are formed in a blade shape and are pivotally supported at the distal end of the sheath so that the edges face each other so that they can be opened and closed in a bowl shape. The forceps cup is remotely opened and closed from the proximal side of the sheath via an operation wire that is inserted and removably inserted into the sheath.
[0003]
However, if the forceps cup is simply formed in a hemispherical shape, it is difficult to collect a tissue sample larger than the inner volume of the forceps cup. Compressed between the forceps cups and collapsed.
[0004]
Therefore, by forming a relief hole in a part of the forceps cup, when a tissue specimen larger than the internal volume of the forceps cup is collected, the tissue specimen protrudes from the escape hole, and a large tissue specimen is collected without being crushed. So-called perforated forceps that can be used are used (Japanese Utility Model Publication No. 52-47342, Japanese Utility Model Publication No. 56-52887).
[0005]
[Problems to be solved by the invention]
However, in the case of the perforated forceps as described above, since the tissue specimen can only be increased to the extent that it swells outward from the escape hole formed in each forceps cup, it is difficult to collect the entire polyp, for example.
[0006]
Therefore, an object of the present invention is to provide an endoscopic biopsy forceps capable of collecting a tissue sample that is much larger than the size of a forceps cup.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the biopsy forceps for endoscope according to the present invention has a pair of forceps cups whose edges are formed in a blade shape so that the ends of the sheath can be opened and closed in a bowl shape with the edges facing each other. In the endoscopic biopsy forceps that is pivotally supported on the sheath and remotely opens and closes the forceps cup from the proximal side of the sheath, the rear end walls of the pair of forceps cups are cut off from the edge side. The rear end side of the pair of forceps cups is opened rearward when the pair of forceps cups is closed.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
FIG. 3 is a side sectional view of the distal end portion of the biopsy forceps for endoscope according to the first embodiment of the present invention, and FIG. 4 is a plan sectional view thereof. However, in FIG. 4, two intermediate rivets 63a, 63b, etc. are shown in positions not appearing in the original plan sectional view so that the structure can be easily understood.
[0009]
A flexible sheath 1 is inserted into and removed from a forceps channel of an endoscope (not shown), and is formed of, for example, a coil pipe in which a stainless steel wire is tightly wound with a constant diameter.
[0010]
An operation wire 2 is inserted through the entire length of the flexible sheath 1 so as to be movable back and forth in the axial direction. The operation wire 2 is advanced and retracted at an operation portion (not shown) connected to the proximal side of the flexible sheath 1. The
[0011]
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. The pair of forceps cups 5 (5a, 5b) is supported by the support shaft 4 so as to open and close like a bowl around the support shaft 4 attached in the vicinity of the tip of the tip support frame 3 so as to cross the slit 31. Has been.
[0012]
In the slit 31, a link mechanism 6 that converts the advance / retreat operation of the operation wire 2 into the opening / closing operation of the forceps cup 5 is disposed. The link mechanism 6 is configured in a so-called pantograph shape, and intermediate link plates 62a and 62b are connected to link portions 61a and 61b formed integrally with the forceps cups 5 (5a and 5b) by intermediate rivets 63a and 63b. ing.
[0013]
The rear end portions of the two intermediate link plates 62 a and 62 b are connected to the front end portion of the wire connection link 65 fixed to the front end of the operation wire 2 by the rear rivet 64.
[0014]
Each of the pair of forceps cups 5 (5a, 5b) is formed in a shape in which a hemisphere is stretched in the front-rear direction, and is arranged in a positional relationship in which the edge portions 51 formed in a blade shape face each other.
[0015]
However, each of the forceps cups 5 (5a, 5b) has a shape in which the rear end wall is not cut off from the edge 51 side formed in a blade shape. Reference numeral 52 denotes the cut portion.
[0016]
As a result, as shown by a two-dot chain line in FIG. 3, when the pair of forceps cups 5 (5a, 5b) is in a closed state, the rear end side of the forceps cups 5 (5a, 5b) is not engaged. It will be in the state opened greatly toward back.
[0017]
FIGS. 1 and 2 show a state in which, for example, a raised portion of a polyp 100 is collected using the endoscopic biopsy forceps of the above embodiment. As shown in FIG. Open wide and close while pressing against polyp 100.
[0018]
Then, as shown in FIG. 2, the base side portion of the polyp 100 is cut by the forceps cup 5, and the head portion 100 a of the polyp 100 that does not completely enter the forceps cup 5 is cut away by the cut-out portion 52 of the forceps cup 5. The whole polyp 100 can be sampled in a state where it protrudes greatly from the rear.
[0019]
5 to 7 show a distal end portion of an endoscopic biopsy forceps according to a second embodiment of the present invention, FIG. 5 is a plan sectional view, and FIG. 6 is a pair of forceps cups 5 (5a, 5b). FIG. 7 is a side cross-sectional view showing a state in which is opened.
[0020]
In this embodiment, each forceps cup 5 (5a, 5b) is formed in a shape in which a hemisphere is elongated in an oval shape in both the left and right directions, and the tip side portion of the edge portion 51 is parallel to the direction of the support shaft 4 (therefore. , And is formed in a straight line shape perpendicular to the axis of the distal end portion of the flexible sheath 1.
[0021]
The other parts are the same as in the first embodiment, and the rear end wall of each forceps cup 5 (5a, 5b) is formed in a shape cut from the edge 51 side. In the same manner as in the first embodiment, the entire polyp 100 can be collected in a wide range. 52 is a cutting part.
[0022]
The present invention is not limited to the above embodiment, and may be used for collecting any tissue sample other than the polyp 100. For example, a tissue sample much larger than the size of the forceps cup 5 may be used. Can be collected.
[0023]
【The invention's effect】
According to the present invention, the rear end walls of the pair of forceps cups are formed in a shape cut from the edge side, and when the pair of forceps cups are closed, the rear end sides of the pair of forceps cups are When the base part of the tissue specimen is cut with a forceps cup, the tissue specimen part that does not fit inside the forceps cup is rearward from the cutout part of the forceps cup. It is collected in a state where it is popped out and can be easily collected without crushing a tissue specimen that is much larger than the size of the forceps cup.
[Brief description of the drawings]
FIG. 1 is a perspective view schematically showing a usage state of an endoscopic biopsy forceps according to a first embodiment of the present invention.
FIG. 2 is a perspective view of a specimen collection state by an endoscopic biopsy forceps according to the first embodiment of the present invention.
FIG. 3 is a side sectional view of a distal end portion of an endoscopic biopsy forceps according to the first embodiment of the present invention.
FIG. 4 is a plan sectional view of the distal end portion of the endoscopic biopsy forceps according to the first embodiment of the present invention.
FIG. 5 is a plan sectional view of a distal end portion of an endoscopic 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 endoscopic biopsy forceps according to a second embodiment of the present invention.
FIG. 7 is a perspective view of a distal end portion of an endoscopic biopsy forceps according to a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Flexible sheath 2 Operation wire 4 Support shaft 5 (5a, 5b) Forceps cup 6 Link mechanism 51 Edge edge 52 of forceps cup Cutting part of forceps cup

Claims (1)

A pair of forceps cups whose edges are formed in a blade shape are pivotally supported at the tip of the sheath so that the edges can be opened and closed in a saddle-like manner, and are formed integrally with the forceps cups. Is provided to extend rearward from the shaft support portion, and the pair of forceps cups rotate about the shaft center by remotely driving the link portion by an operation from the proximal side of the sheath. in endoscopic biopsy forceps so that to open and close,
The second part of each of the pair of forceps cups, and formed in a shape portion is all cut scraped off outside than the width of the link portions in the direction perpendicular to the closing direction of the forceps cups,
In a state in which the pair of forcep cups are closed, half after each forceps cups, characterized in that as a state in which the width is from open in all areas outside of the link section Endoscopic biopsy forceps.

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