JP2001340347A - Endoscope forceps - Google Patents

Abstract

(57) [Problem] To provide a structure in which the tip of a wire is directly connected to a drive lever rotatably sandwiched between slits, without causing the tip of the wire to catch on the mouth of the slit. To provide an endoscope forceps capable of continuing operation. A shape (5z) of a driving lever (5a, 5b) that is cut off so as to form a gap (A) between a rear surface of a surface of the driving lever (5a, 5b) and a side in contact with a wall surface of the slit (41).
The wires 2a and 2b were drawn through the gap A from the distal end of the sheath 1 and connected to the drive levers 5a and 5b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forceps for an endoscope which is inserted into a forceps channel of an endoscope and a tip of the forceps is opened and closed like a beak by an operation from a hand side.

[0002]

2. Description of the Related Art FIG. 8 is a side sectional view of a conventional biopsy forceps for an endoscope.
A slit 41 is formed in a direction parallel to the axis.

[0003] A pair of drive levers 5a, 5b formed integrally with the pair of forceps pieces 3a, 3b and sandwiched between the slits 41 rotate about a support shaft arranged across the slits 41. It is freely supported.

[0004] A pair of wires 2a, 2a is attached to the distal end of an operation wire 2 which is inserted into the sheath 1 so as to be able to advance and retreat in the axial direction.
b are connected, and the distal ends of the pair of wires 2a, 2b are connected near the rear ends of the drive levers 5a, 5b, and the drive levers 5a, 5b are pivoted by operating the operation wire 2 in the axial direction. 9, the forceps pieces 3a, 3
b is driven to open and close in a beak shape.

The ends of the wires 2a and 2b and the drive lever 5
As shown in the plan partial cross-sectional view of FIG. 9, the rearward portion of the drive levers 5 a and 5 b on the side in contact with the wall surface of the slit 41 is It is formed in a shape that has been shaved off so as to create a gap A between the wall surface. 5z is the surface.

The distal ends of the wires 2a, 2b are passed through small holes 6a, 6b formed near the rear ends of the drive levers 5a, 5b, and the folded portions are passed through the gap A.

[0007]

However, if such folded portions of the wires 2a and 2b are deformed in a direction in which the forceps are repeatedly used, the wires 2a and 2b may be deformed in the direction shown in FIG.
As shown in the front cross-sectional view of FIG. 0, the tip B of the folded portion of the wires 2a and 2b may be caught by the mouth of the slit 41, resulting in malfunction.

Accordingly, the present invention provides a structure in which the tip of a wire is directly connected to a drive lever rotatably sandwiched between slits, and the wire operates well without the tip of the wire being caught on the mouth of the slit. It is an object of the present invention to provide an endoscope forceps capable of continuing the operation.

[0009]

In order to achieve the above object, an endoscope forceps of the present invention has a pair of slits formed in a direction parallel to an axis on a distal end support frame disposed at a distal end of a sheath. A pair of drive levers formed integrally with the forceps piece and sandwiched between the slits are rotatably supported on a spindle disposed across the slits, and the sheath is operated by a proximal end of the sheath. The tip of a pair of wires coming and going from the tip of the wire is connected near the rear end of the drive lever, and the wire is moved forward and backward in the axial direction, so that the drive lever rotates about the support shaft and the forceps piece opens and closes like a beak. In the forceps for an endoscope to be driven, a rear portion of a surface of the drive lever which is in contact with the wall surface of the slit is formed in a shape which is cut off so that a gap is formed between the forceps and the wall surface of the slit. , Wire the tip of the sheath Is the concatenation with the drive lever through pulling in Luo gap.

[0010]

Embodiments of the present invention will be described with reference to the drawings. FIG. 3 shows a biopsy forceps for an endoscope used through a forceps channel of an endoscope. The flexible sheath 1 is formed, for example, by a coil pipe in which a stainless steel wire is tightly wound with a constant diameter. Have been.

An operation wire 2 is inserted through the entire length of the flexible sheath 1 such that the operation wire 2 can move forward and backward in the axial direction. The pair of forceps pieces 3a, 3b arranged on the distal end side of the pair are driven to open and close.

An operation section 10 for moving the operation wire 2 forward and backward is connected to the proximal end (base end) of the flexible sheath 1. The proximal end of the operation wire 2 is
Is connected to a slider 12 that can move forward and backward in the axial direction with respect to the operation unit body 11 and the slider 12.
The operation wires 2 are moved forward and backward by operating the slider 12 forward and backward.

FIG. 2 is a side sectional view of the distal end portion of the flexible sheath 1 on which the forceps pieces 3a and 3b are disposed, and FIG. 1 is a partial sectional view of the plane. However, in FIG. 1, one of the members provided one by one is omitted.

The distal end support frame 4 connected and fixed to the distal end of the flexible sheath 1 has a slit 41 formed in a direction parallel to the axis.
Thus, the front half is formed into a shape that is largely divided into forks.

Drive levers 5a and 5b are integrally connected to the pair of forceps pieces 3a and 3b, respectively, and the pair of drive levers 5a and 5b are, as shown in FIG.
It is sandwiched between the sandwiches.

A support shaft 9 attached to the vicinity of the distal end of the distal end support frame 4 so as to cross the slit 41 is passed through a hole 8 formed at a position nearer to the drive levers 5a and 5b. The drive levers 5a, 5b are rotatably supported by the support shaft 9, and the pair of drive levers 5a, 5b rotate about the support shaft 9, so that the pair of forceps pieces 3a, 3b open and close like a beak. I do.

As the operation wire 2, two wires 2a and 2b made of a stranded wire or a single wire of a stainless steel wire are arranged side by side in the flexible sheath 1, and the tip portions of the two wires 2a and 2b. Project forward from the distal end of the flexible sheath 1 and engage with small holes 6a and 6b formed near the rear ends of the drive levers 5a and 5b.

The rear portion of the drive levers 5a and 5b on the side in contact with the wall surface of the slit 41 is formed in a shape that is cut off so that a gap A is formed between the drive lever 5a and the wall surface of the slit 41. 5z is the shaved surface. The wires 2a and 2b are separated from the distal end of the sheath 1 by the gap A.
And is bent toward the small holes 6a and 6b.

In this embodiment, the ends of the wires 2a, 2b passed through the small holes 6a, 6b
Is bent rearward on the space side having a half of the width.

The wires 2a, 2b are rotated without being fixed to the small holes 6a, 6b so that the forceps pieces 3a, 3b can change the direction without resistance with respect to the tips of the wires 2a, 2b. They are freely connected.

The two wires 2a and 2b are twisted together in the vicinity of the distal end of the flexible sheath 1 and are in the same state as when they are bound. Therefore, the operation wire 2
, The two wires 2a and 2b work together without bias.

With such a configuration, when the operation wire 2 is advanced or retracted in the operation section 10, the drive levers 5a and 5b connected to the distal ends of the wires 2a and 2b rotate about the support shaft 9, thereby the forceps. The pieces 3a and 3b open and close like a beak.

At the time of such an operation, the ends B of the folded wires 2a and 2b enter and exit the slit 41 from the side. As shown in FIG. 1 and FIG. Since the end B of each of the wires 2a and 2b is located on the side of a wide space having half the width of the slit 41,
Even if the end B of a and 2b is slightly widened, the slit 41
The opening and closing operation is reliably performed without being caught by the mouth of the user.

FIG. 5 shows a distal end portion of an endoscope biopsy forceps according to a second embodiment of the present invention, in which wires 2a and 2b are shown.
However, it is the same as in the first embodiment described above in that it is guided from the distal end of the sheath 1 into the gap A between the scraping surfaces 5z of the drive levers 5a and 5b and the side surfaces of the slit 41.

In this embodiment, the wires 2a, 2b bent from the gap A to the small holes 6a, 6b
Is formed with a spherical stopper 2c as a stopper for the small holes 6a and 6b. Even with such a configuration, by employing the present invention, the stopper 2c does not come into contact with the mouth of the slit 41, and the opening and closing operation is reliably performed.

FIG. 6 shows a distal end portion of a biopsy forceps for an endoscope according to a third embodiment of the present invention, wherein wires 2a and 2b are provided.
Is guided from the tip of the sheath 1 into the gap A between the scraping surface 5z of the drive levers 5a and 5b and the side surface of the slit 41 as in the first and second embodiments. .

In this embodiment, an eyelet-shaped stopper 2d is attached to the tip of each of the wires 2a, 2b bent from the inside of the gap toward the small holes 6a, 6b as a stopper for the small holes 6a, 6b. . Even with such a configuration, by adopting the present invention, the stopper 2d does not hit the mouth of the slit 41, and the opening / closing operation is reliably performed.

As shown in the enlarged view of FIG. 7, the length of the small diameter portion of the eyelet-shaped stopper 2d passed through the small holes 6a and 6b is made longer than the length of the small holes 6a and 6b. Since the wires 2a and 2b do not directly touch the drive levers 5a and 5b, the operation becomes smoother.

The present invention is not limited to the above embodiment. For example, a forceps piece at the tip is opened and closed like a beak by operation from the hand side, such as a grasping forceps or scissors forceps for an endoscope. It can be widely applied to various endoscope forceps to be performed.

[0030]

According to the present invention, the rear portion of the surface of the drive lever that is in contact with the wall surface of the slit is formed into a shape that is cut off so as to form a gap between the wall surface of the slit and the wire. Is drawn into the gap from the distal end of the sheath and connected to the drive lever, so that the end of the wire is located on the side of a wide space having half the width of the slit. Even if it spreads, the opening and closing operation can be performed reliably without being caught by the mouth of the slit.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional plan 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 an external view of a biopsy forceps for an endoscope according to a first embodiment of the present invention.

FIG. 4 is an enlarged front sectional view of a distal end portion of the biopsy forceps for an endoscope according to the first embodiment of the present invention.

FIG. 5 is a plan partial cross-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 partial plan sectional view of a distal end portion of an endoscope biopsy forceps according to a third embodiment of the present invention.

FIG. 7 is an enlarged sectional plan view of a connecting portion between a wire and a drive lever at a distal end portion of a biopsy forceps for an endoscope according to a third embodiment of the present invention.

FIG. 8 is a side sectional view of a distal end portion of a conventional endoscope biopsy forceps.

FIG. 9 is a partial plan sectional view of a distal end portion of a conventional endoscope biopsy forceps.

FIG. 10 is an enlarged front sectional view of a distal end portion of a biopsy forceps for an endoscope according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flexible sheath 2 Operation wire 2a, 2b Wire 2c, 2d Stopper 3a, 3b Forceps piece 5a, 5b Drive lever 5z Stripping surface 6a, 6b Small hole 9 Support shaft 41 Slit A Gap B Wire end

Claims (1)

[Claims] A slit is formed in a distal end support frame disposed at a distal end of a sheath in a direction parallel to an axis, and is integrally formed with a pair of forceps pieces, and a pair of driving members are sandwiched between the slits. A lever is rotatably supported on a support shaft arranged across the slit, and the distal ends of a pair of wires that enter and exit from the distal end of the sheath by operating from the proximal end side of the sheath are near the rear end of the drive lever. In the endoscope forceps, the drive lever is rotated about the support shaft by operating the wire in the axial direction so that the forceps piece is driven to open and close in a beak shape. A rearward portion of the surface of the drive lever that is in contact with the wall surface of the slit is formed in a shape that is scraped off so that a gap is formed between the drive lever and the wall surface of the slit. Gap A forceps for an endoscope, wherein the forceps are drawn into the space and connected to the drive lever.