JP4566358B2 - 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 whose forceps cup at the tip is opened and closed in a hook shape by an operation from the hand side.
[0002]
[Prior art]
Endoscopic biopsy forceps generally have a pair of forceps cups, each of which has a drive lever integrally connected thereto, and the drive lever is supported by the distal end portion of the sheath so as to be rotatable about a support shaft, and is inserted into the sheath. By operating the arranged operation wire forward and backward in the axial direction, the forceps cup and the drive lever rotate about the support shaft, and the forceps cup is driven to open and close like a hook.
[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. 9 shows an integral part of a forceps cup 3 and a drive lever 5 of a conventional endoscopic biopsy forceps by such press working. FIG. 10 shows a cross section of a boundary portion 35 between the forceps cup 3 portion and the drive lever 5 portion, and has a structure in which a metal plate material is folded and brought into close contact.
[0005]
[Problems to be solved by the invention]
When a pair of forceps cups 7 is engaged with a mucosal tissue of a living body during use, a large force acts on the forceps cup 3 in an irregular direction, and the concentrated stress is a boundary portion that is the neck of the forceps cup 3. Act on 35.
[0006]
Then, since the boundary portion 35 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 35 bends in the lateral direction indicated by the arrow A in FIG. There is a case where the forceps cup 3 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-mentioned object, the biopsy forceps for endoscope according to the present invention has a pair of forceps cups in which drive levers are integrally connected to each other, and the drive lever is rotatable around a support shaft. By operating the operation wire supported by the tip and inserted and inserted in the sheath in the axial direction, the forceps cup and the drive lever rotate around the support shaft, and the forceps cup is opened and closed like a bowl. In the endoscopic biopsy forceps configured as described above, the drive lever has a rear end portion of the forceps cup on the remaining material plate positioned substantially on the same surface as the edge of the forceps cup formed by recessing the material plate. In FIG. 2, the wire is twisted approximately 90 °.
[0009]
The drive lever extends above and below the same surface position of the edge of the forceps cup, and one half of the right and left half of the forceps cup is curved with respect to the upper portion of the drive lever. The other half is preferably connected in a curved shape to the lower part of the drive lever.
[0010]
Further, when the surfaces of the pair of drive levers are brought into contact with each other, the edges of the pair of forceps cups may be brought into contact with each other.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
FIG. 2 shows an endoscopic biopsy forceps used through the forceps channel of the endoscope, and the flexible sheath 1 is formed by a coil pipe in which a stainless steel wire is tightly wound with a constant diameter, for example. Has been.
[0012]
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, and the distal end side of the flexible sheath 1 is moved forward and backward in the axial direction from the hand side. The pair of forceps cups 3a and 3b arranged in the open / close state is driven to open and close.
[0013]
An operation portion 10 for advancing and retracting the operation wire 2 is connected to the proximal side end portion (base end portion) of the flexible sheath 1, and the operation portion main body 11 and the operation portion main body 11 can be moved forward and backward in the axial direction. Finger grips 13 and 14 are attached to the slider 12, respectively. The proximal end of the operation wire 2 is connected to the slider 12.
[0014]
FIGS. 3 and 4 are a side sectional view and a plan sectional view of the distal end portion of the flexible sheath 1 in which the forceps cups 3 a and 3 b are arranged, and the distal end support connected and fixed to the distal end of the flexible sheath 1. The frame 4 is formed in a shape in which the front half is largely divided into forks by slits 41.
[0015]
Drive levers 5a and 5b are integrally connected to the pair of forceps cups 3a and 3b, respectively. A support shaft 9 attached in the vicinity of the tip of the tip support frame 4 so as to cross the slit 41 is passed through a shaft hole 8 formed in the drive levers 5a and 5b, and a pair of forceps cups 3a and 3b. Opens and closes in a bowl shape around the support shaft 9. Reference numeral 7 denotes a washer-shaped spacer.
[0016]
As the operation wire 2, two wires 2 a and 2 b made of stainless steel wire or single wire are arranged in the flexible sheath 1, and the tips of the two wires 2 a and 2 b are flexible. It protrudes forward from the distal end of the sheath 1 and engages with small holes 6a and 6b formed near the rear ends of the drive levers 5a and 5b.
[0017]
With such a configuration, when the operation wire 2 is advanced and retracted in the operation unit 10, the drive levers 5a and 5b connected to the tips of the wires 2a and 2b rotate about the support shaft 9, thereby the forceps cups 3a and 3b. 3b opens and closes like a bowl.
[0018]
FIG. 1 is a perspective view showing the forceps cups 3a and 3b and the drive levers 5a and 5b formed as a single component, FIG. 5 is a plan view thereof, and FIG. 6 is a side view showing a part in cross section. is there.
[0019]
The forceps cups 3a and 3b and the drive levers 5a and 5b are press-molded from a single stainless steel plate as a material. First, the forceps cups 3a and 3b are formed by recessing the material plate into a bowl shape, and then the forceps The remaining material flat plate positioned substantially on the same surface as the edges of the cups 3a and 3b is twisted by 90 ° at the rear ends of the forceps cups 3a and 3b to form flat drive levers 5a and 5b.
[0020]
The drive levers 5a and 5b extend above and below the same surface position of the edges of the forceps cups 3a and 3b (upper part U and lower part D), and the left and right half parts of the latter half of the forceps cups 3a and 3b. One half (R) is connected to the upper part U of the drive levers 5a and 5b in a curved shape, and the other half (L) is curved to the lower part D of the drive levers 5a and 5b. linked.
[0021]
Thus, the forceps cups 3a and 3b and the drive levers 5a and 5b are formed by forming the hook-shaped forceps cups 3a and 3b and the flat drive levers 5a and 5b into a shape connected by a curved surface twisted by 90 °. The boundary portion has sufficient strength not to be deformed by normal use in any of the vertical and horizontal directions.
[0022]
As shown in FIG. 7, one surface of each drive lever 5a, 5b is located at the diameter position of the forceps cup 3a, 3b perpendicular to the edge of the forceps cup 3a, 3b, and a pair of drive When the surfaces of the levers 5a and 5b are brought into contact with each other, the edges of the pair of forceps cups 3a and 3b are brought into contact with each other. Therefore, the same parts may be turned over and combined.
[0023]
In addition, as shown in FIG. 8, the size of the drive levers 5a and 5b may be appropriately changed according to the design requirements. Alternatively, the forceps cups 3a and 3b may be driven to open and close by interposing a pantograph-like link mechanism or the like between the operation wire 2 and the drive levers 5a and 5b.
[0024]
【The invention's effect】
According to the present invention, the drive lever twists the remaining material flat plate positioned substantially on the same plane as the edge of the forceps cup formed by denting the material flat plate at the rear end portion of the forceps cup by approximately 90 °. As a result, the forceps cup and the drive lever can be integrally formed by press processing and can be manufactured at a low cost, and the boundary between the forceps cup and the drive lever is resistant to lateral bending and Excellent durability that does not deform in use can be obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view of a forceps cup and a drive lever of an endoscopic biopsy forceps according to a first embodiment of the present invention.
FIG. 2 is an overall configuration diagram of an endoscopic biopsy forceps according to a first embodiment of the present invention.
FIG. 3 is a side cross-sectional view of an operation unit 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 view of a forceps cup and a drive lever of an endoscopic biopsy forceps according to the first embodiment of the present invention.
FIG. 6 is a side view showing a cross-section of a forceps cup and a part of a drive lever of the biopsy forceps for endoscope according to the first embodiment of the present invention.
FIG. 7 is a schematic front view of a forceps cup and a drive lever of an endoscopic biopsy forceps according to the first embodiment of the present invention.
FIG. 8 is a side view showing in cross section a part of a forceps cup and a drive lever of an endoscopic biopsy forceps according to a second embodiment of the present invention.
FIG. 9 is a perspective view of a forceps cup and a drive lever of a conventional endoscopic biopsy forceps.
10 is a cross-sectional view taken along line XX in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Flexible sheath 2 (2a, 2b) Operation wire 3a, 3b Forceps cup 5a, 5b Drive lever 8 Shaft hole 9 Spindle D Lower part U of drive lever Upper part R, L of drive lever Curved connection part

Claims (2)

A drive lever is integrally connected to each of the pair of forceps cups, the drive lever is supported by the distal end portion of the sheath so as to be rotatable about a support shaft, and an operation wire inserted and disposed in the sheath is disposed in the axial direction. In the endoscopic biopsy forceps in which the forceps cup and the drive lever are rotated about the support shaft so that the forceps cup is driven to open and close like a bowl by
The drive lever is formed by twisting the remaining material flat plate positioned substantially on the same surface as the edge of the forceps cup formed by recessing the material flat plate at the rear end of the forceps cup by approximately 90 ° ,
As a result, the drive lever extends above and below the same surface position of the edge of the forceps cup, and one half of the left and right half of the forceps cup is an upper portion of the drive lever. An endoscopic biopsy forceps characterized in that the other half is connected in a curved shape to the lower part of the drive lever . When brought into contact with the surface each other of the pair of drive levers, claim 1 Symbol placement endoscopic biopsy forceps the edges to each other of the pair of forcep cups abut.

Images