Forceps and tissue collection method

Patent metadata

Field	Value
Publication number	US-12433622-B2
Application number	US-202217709594-A
Country	US
Kind code	B2
Filing date	Mar 31, 2022
Priority date	Mar 31, 2022
Publication date	Oct 7, 2025
Grant date	Oct 7, 2025

Abstract

Provided are a forceps including: a shaft; a wire that is movable in a longitudinal direction inside the shaft; and a first arm and a second arm, each of which has a first jaw or a second jaw, that are connected to each other in a pivotable manner by means of a third joint. The first arm is connected to a distal end of the shaft in a pivotable manner by means of a first joint, and the second arm is connected to a distal end of the wire in a pivotable manner by means of a second joint. The third joint is provided between the first jaw and the first joint and between the second jaw and the second joint, and is disposed lateral to the wire in a state in which the first and second jaws are open. The first and second jaws are closed while the third joint is moving outward in the lateral direction with respect to the shaft.

First claim

The invention claimed is:

1. A forceps comprising:
an elongated shaft;
an elongated wire that is disposed inside the elongated shaft and that is movable in a longitudinal direction of the elongated shaft;
a first arm that is disposed on a distal side of the elongated shaft and that has a first jaw, the first arm being directly connected to a distal end of the elongated shaft in a pivotable manner by a first joint; and
a second arm that is disposed on the distal side of the elongated shaft and that has a second jaw, the second arm being directly connected to a distal end of the elongated wire in a pivotable manner by a second joint, wherein
the first arm and the second arm are connected to each other in a pivotable manner by a third joint and the third joint is provided between the first jaw and the first joint and between the second jaw and the second joint,
movement of the elongated wire causes the second joint to move along the axial direction of the elongated wire with respect to the first joint, thereby opening and closing the first jaw and the second jaw with respect to each other,
the third joint is disposed lateral to a longitudinal axis of the elongated wire in a state in which the first jaw and the second jaw are open, and
the first jaw and the second jaw are closed while the third joint is moved outward with respect to the elongated shaft from a lateral direction of the longitudinal axis of the elongated wire toward the longitudinal axis of the elongated wire.

2. The forceps according to claim 1 , wherein:
in the state in which the first jaw and the second jaw are open, the first joint and the second joint are arranged along the longitudinal axis of the elongated wire, and the third joint is disposed at a position away from the longitudinal axis of the elongated wire on the first and second jaws side in the lateral direction; and
the second joint is linearly moved along the longitudinal axis of the elongated wire due to the movement of the elongated wire.

3. The forceps according to claim 1 , wherein, in a state in which the first jaw and the second jaw are closed, the position of the second joint coincides with the position of the first joint the longitudinal axis of the elongated wire.

4. The forceps according to claim 1 , wherein a first portion of the elongated wire disposed between the first joint and the second joint is more rigid than a second portion of the elongated wire proximal to the first portion.

5. The forceps according to claim 1 , wherein:
the second arm has a slot that has a first terminal end and a second terminal end and that supports the second joint between the first terminal end and the second terminal end in a slidable manner;
in the state in which the first jaw and the second jaw are open, the first terminal end is offset in the lateral direction with respect to the third joint and is disposed at a position farther on the proximal side than the second terminal end; and,
in a state in which the first jaw and the second jaw are closed and the first arm and the second arm are disposed along the axial direction of the elongated wire, the second terminal end is offset in the lateral direction with respect to the third joint and is disposed at a position farther on the proximal side than the first terminal end.

6. The forceps according to claim 1 , further comprising a locking mechanism that locks the first arm and the second arm when the first jaw and the second jaw are closed, wherein the locking mechanism has an engaged portion that is provided in one of the first arm and the second arm, and
an engaging portion that is provided in the other one of the first arm and the second arm, and,
when the first jaw and the second jaw are closed, the engaging portion hooks to the engaged portion and locks the first jaw and the second jaw in a closed state.

7. A tissue collection method using the forceps according to claim 1 , the method comprising:
inserting the forceps in which the first jaw and the second jaw are open into a sheath disposed inside a body cavity;
making the first arm and the second arm protrude from the distal end of the sheath;
closing the first jaw and the second jaw to collect tissue by moving the elongated wire in the longitudinal direction;
accommodating the first arm and the second arm in which the first jaw and the second jaw are closed in the sheath by pulling the elongated shaft;
pulling the forceps out of the sheath; and
taking out the tissue from the first jaw and the second jaw by opening the first jaw and the second jaw.

Assignees

• Olympus Medical Systems Corp

Inventors

• Ito Ryosuke
• Ito Koichiro

Classifications

• A61B17/2833

  Locking means · CPC title

• A61B2017/2901

  Details of shaft · CPC title

• A61B10/04

  Endoscopic instruments, e.g. catheter-type instruments · CPC title

• A61B2017/2936

  Pins in guiding slots · CPC title

• A61B2017/2939

  Details of linkages or pivot points · CPC title