JP4441506B2 - Endoscopy forceps - Google Patents

Description

  The present invention relates to an endoscopic forceps.

In an endoscopic forceps, generally, a drive lever is integrally connected to a pair of forceps pieces, and the forceps piece and the drive lever are rotatable around a support shaft in the vicinity of a boundary portion of the tip of the sheath. An operation wire supported by the portion and engaged with the distal end portion of the wire engagement hole formed through the drive lever is drawn through the sheath so as to be able to advance and retract in the axial direction, and the operation wire is axially moved from the proximal end side of the sheath. By moving forward and backward in the direction, the forceps piece and the drive lever rotate about the support shaft, and the forceps piece opens and closes like a hook (for example, Patent Document 1).
JP2001-340347A

  FIG. 7 shows the wire engaging hole 91 and the distal end portion of the operation wire 92 engaged therewith in the forceps for endoscope described in Patent Document 1, and the wire engaging hole 91 is the drive lever 93. The operation wire 92 is formed so as to vertically penetrate from the side and engage with the wire engagement hole 91 in a bent state in accordance with the direction of the wire engagement hole 91.

  However, in such a configuration, when a strong traction force is repeatedly applied to the operation wire 92, the bent portion of the operation wire 92 is gradually opened, and even if the engagement with the wire engagement hole 91 is disengaged or does not disengage, the operation failure is caused. There is a risk of causing.

  Therefore, for example, as shown in FIG. 8, it is conceivable to form or attach a stopper 94 having a size that cannot pass through the wire engagement hole 91 at the most distal portion of the operation wire 92. Compared to a configuration in which the tip portion is simply bent, the manufacturing process becomes cumbersome and causes a significant cost increase.

  In view of the above, the present invention is configured so as not to be costly enough to bend the distal end portion of the operation wire, and to reliably engage the operation wire with the wire engagement hole formed in the drive lever so that the operation wire does not come off or malfunction. An object of the present invention is to provide an endoscopic forceps that can be used.

  In order to achieve the above object, the forceps for endoscope according to the present invention includes a pair of forceps pieces each having a drive lever integrally connected thereto, and the vicinity of the boundary between the forceps piece and the drive lever is centered on the support shaft. An operation wire, which is rotatably supported by the distal end portion of the sheath and engages with the wire engagement hole formed in the drive lever so as to be engaged with the distal end portion, is drawn into the sheath so as to advance and retract in the axial direction. For endoscopes that are configured so that the forceps piece and the drive lever rotate about the support shaft by opening and closing the operation wire in the axial direction from the end side, so that the forceps piece opens and closes in a hook shape In the forceps, the wire engagement hole is formed in the drive lever at an acute angle with respect to the direction of the operation wire going into the sheath from there, and the operation wire is bent in accordance with the direction of the wire engagement hole Is engaged through the wire engagement hole with It is those who are.

  Note that the operation wire may be disposed in a state where the operation wire is bent acutely rearward from the front opening end of the two opening ends of the wire engagement hole formed in an oblique direction and is directed into the sheath. . Further, the wire engagement hole may be formed in a tapered hole shape in which the diameter of the front opening end is larger than the diameter of the opening end on the other end side.

  According to the present invention, the wire engaging hole is formed in the drive lever at an acute angle with respect to the direction of the operation wire going into the sheath from there, and the operation wire is bent in accordance with the direction of the wire engagement hole. The operation wire with respect to the wire engagement hole formed in the drive lever with a configuration that does not cost to bend the tip portion of the operation wire by being passed through and engaged with the wire engagement hole. Can be securely engaged so as not to come off or malfunction.

  A drive lever is integrally connected to the pair of forceps pieces, and the vicinity of the boundary between the forceps piece and the drive lever is supported by the distal end portion of the sheath so as to be rotatable about the support shaft, and is formed to penetrate the drive lever. An operation wire whose distal end engages with the wire engagement hole is drawn through the sheath so as to be able to advance and retreat in the axial direction, and the operation wire is advanced and retracted in the axial direction from the proximal end side of the sheath. In the endoscopic forceps configured such that the driving lever rotates about the support shaft and the forceps piece opens and closes in a hook shape, the wire engagement hole extends from the operation wire toward the inside of the sheath. The drive lever is formed at an acute angle and obliquely with respect to the direction, and the operation wire is passed through and engaged with the wire engagement hole while being bent in accordance with the direction of the wire engagement hole.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 2 shows the overall configuration of an endoscopic forceps, and an operation wire is placed in a flexible sheath 1 made of, for example, a tightly wound coil pipe that is inserted into a treatment instrument insertion channel of an endoscope (not shown). 2, a pair of forceps pieces 3 that are opened and closed in an axial direction and opened and closed in a hook shape toward the front (downward in the figure) are disposed at the distal end portion of the sheath 1.

  The operation unit 10 connected to the base end of the sheath 1 has a fixed finger hook 12 formed at the base end of the operation unit main body 11, and an operation wire connected to a movable finger hook 13 slidably disposed with respect to the operation unit main body 11. 2, the movable wire hook 13 is moved with respect to the fixed finger hook 12, whereby the operation wire 2 moves forward and backward within the sheath 1, and the pair of forceps pieces 3 open and close at the distal end of the sheath 1. .

  FIG. 3 shows a distal end portion of the forceps for endoscope according to the first embodiment of the present invention, and a pair of forceps pieces 3 formed in a cup shape for collecting a biopsy tissue are respectively disposed behind the forceps pieces 3. It is formed as one component in a state of being integrally connected to the drive lever 4. Note that the forceps piece 3 may be formed in a bowl shape or other shapes.

  A distal end body 5 connected and fixed to the distal end of the sheath 1 is formed in a shape divided into two by a slit 6 from the most distal side, and a forceps piece 3 and a drive lever 4 are attached to a support shaft 7 arranged near the distal end. The vicinity of the boundary is supported rotatably.

  Two operation wires 2 are twisted together in the sheath 1 so as to advance and retreat integrally, and the distal end portion of each operation wire 2 is formed in a wire engagement hole formed in each drive lever 4. 8 is engaged in a state of being passed through 8, and is passed through the sheath 1 in the rearward direction so as to be movable forward and backward in the axial direction.

  As a result, when the operation wire 2 is moved back and forth in the axial direction from the operation portion 10 side, the operation wire 2 moves back and forth in the axial direction in the sheath 1, and the forceps piece 3 and the drive lever 4 are centered on the support shaft 7. The pair of forceps pieces 3 opens and closes in a bowl shape toward the front.

  FIG. 1 shows a distal end portion of the operation wire 2 of the embodiment configured as described above and a wire engagement hole 8 engaged therewith, and the wire engagement hole 8 extends from the operation wire 2 toward the sheath 1. The drive lever 4 is formed so as to penetrate the drive lever 4 at an acute angle and obliquely with respect to the direction. The inclination angle is about 45 ° in this embodiment, but it is desirable that it is practically in the range of about 30 ° to 60 °.

  And the front-end | tip part of the operation wire 2 is passed through the wire engagement hole 8, and is engaged in the state bent according to the direction of the wire engagement hole 8. FIG. More specifically, the distal end portion of the operation wire 2 is disposed in a state where it is bent backward at an acute angle from the front opening end 8 a of the two opening ends of the wire engagement hole 8 and is directed into the sheath 1. ing.

  As a result, even if the distal end portion of the operation wire 2 is repeatedly pulled with a strong force from the operation portion 10 side, it may come out of the wire engagement hole 8 formed in the drive lever 4 or be deformed so that the distal end side is expanded. hard. In addition, such a reliable connection state can be obtained with a configuration that does not cost to bend the distal end portion of the operation wire 2.

  FIG. 4 shows a second embodiment of the present invention. In the wire engagement hole 8, the diameter of the front opening end 8a in the two opening ends is larger than the diameter of the opening end on the other end side. It is formed in a tapered hole shape. The other points are the same as those of the first embodiment described above. With this configuration, the tip of the operation wire 2 can be easily inserted into the wire engagement hole 8 during assembly work.

  In the first and second embodiments, the operation wire 2 passes through the position (inner side) between the pair of drive levers 4 and is directed to the sheath 1, but the first and second embodiments are shown in FIGS. 5 and 6. As in the third and fourth embodiments, the operation wire 2 may pass through the outer positions of the pair of drive levers 4 toward the sheath 1.

It is a fragmentary sectional view of the front-end | tip part of the operation wire of the forceps for endoscopes of 1st Example of this invention, and the wire engaging hole part engaged with it. It is a side view which shows the whole structure of the forceps for endoscopes of the Example of this invention. It is side surface sectional drawing of the front-end | tip part of the forceps for endoscopes of 1st Example of this invention. It is a fragmentary sectional view of the front-end | tip part of the operation wire of the forceps for endoscopes of the 2nd Example of this invention, and the wire engaging hole part engaged with it. It is a fragmentary sectional view of the front-end | tip part of the operation wire of the forceps for endoscopes of the 3rd Example of this invention, and the wire engaging hole part engaged with it. It is a fragmentary sectional view of the front-end | tip part of the operation wire of the forceps for endoscopes of the 4th Example of this invention, and the wire engaging hole part engaged with it. It is a fragmentary sectional view of the front-end | tip part of the operation wire of the forceps for conventional endoscopes, and the wire engaging hole part engaged with it. It is a fragmentary sectional view of the other example of the front-end | tip part of the operation wire of the forceps for conventional endoscopes, and the wire engaging hole part engaged with it.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sheath 2 Operation wire 3 Forceps piece 4 Drive lever 7 Support shaft 8 Wire engagement hole 8a Front opening end 10 Operation part

Claims (3)

A drive lever is integrally connected to each of the pair of forceps pieces, and the vicinity of the boundary between the forceps piece and the drive lever is supported by the distal end portion of the sheath so as to be rotatable around a support shaft. An operation wire having a distal end engaged with a wire engagement hole formed through is drawn through the sheath so as to be able to advance and retract in the axial direction, and the operation wire is operated to advance and retract in the axial direction from the proximal end side of the sheath. Accordingly, in the endoscopic forceps configured such that the forceps piece and the drive lever rotate around the support shaft so that the forceps piece opens and closes like a hook.
The wire engagement hole is formed in the drive lever at an acute angle with respect to the direction of the operation wire going into the sheath from there, and the operation wire is bent according to the direction of the wire engagement hole. An endoscopic forceps which is passed through and engaged with the wire engagement hole in a state where the force is applied.   The operation wire is arranged in a state in which it is bent rearward at an acute angle from the front opening end of the two opening ends of the wire engagement hole formed in an oblique direction and goes into the sheath. Item 1. The endoscopic forceps according to Item 1.   The endoscopic forceps according to claim 2, wherein the wire engagement hole is formed in a tapered hole shape in which a diameter of the front opening end is larger than a diameter of the opening end on the other end side.

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