BASKET-TYPE GRASPING FORCEPS

• US 20160192957A1
• Filed: 03/15/2016
• Published: 07/07/2016
• Est. Priority Date: 12/12/2013
• Status: Active Grant

• Current Assignee: Olympus Corporation
• Original Assignee: Olympus Corporation
• Inventors: OKADA, Tsutomu
• Granted Patent: US 9,775,634 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61B 17/221 Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions surgical snare instruments A61B17/32056
• CPC Class Codes: A61B 2017/00292 mounted on or guided by flexible, e.g. catheter-like, means
• CPC Class Codes: A61B 2017/00358 Snares for grasping
• CPC Class Codes: A61B 2017/2212 having a closed distal end, e.g. a loop

Abstract

In a discharge mechanism of basket-type grasping forceps according to the present invention, a support member can advance and retract relative to a plurality of basket wires, the position of the support member can be fixed, and an object inside a basket part is discharged to the outside of the basket part from a portion of the basket part proximal to the basket wires by movement of the support member and the basket part relative to each other.

Claims

1. Basket-type grasping forceps comprising:

an insertion section;

a plurality of basket wires having a restoring force that restores helically;

a basket part that is protrudable and retractable from a distal portion of the insertion section and in which the plurality of basket wires extend helically with a predetermined gap therebetween, the basket part including;

a proximal region in which the plurality of basket wires are sparsely arranged;

a distal region in which the plurality of basket wires are arranged more closely than in the proximal region; and

an internal space surrounded by the proximal region and the distal region;

an operating wire that is connected to a proximal end of the basket part and is inserted into the insertion section;

a support member that passes through the gap in the basket part and extends substantially parallel to the operating wire;

a coupling member that fixes a distal end of the basket part to a distal end of the support member;

an operating section that is disposed at a proximal end part of the insertion section in order to advance and retract the operating wire and the support member, respectively; and

a discharge mechanism that discharges an object housed in the internal space of the basket part to the outside of the basket part, wherein

the discharge mechanism has a first configuration in which the operating wire is relatively retracted along a longitudinal axis of the insertion section with respect to the support member by the operating section, and a second configuration in which the operating wire is relatively advanced along the longitudinal axis of the insertion section with respect to the support member by the operating section, and

in the first configuration and the second form, the object housed in the internal space of the basket part is discharged to the outside via the gap in the basket part.

2. The basket-type grasping forceps according to claim 1, wherein

the first configuration in the discharge mechanism is a state where the basket part is stretched out in an axial direction of the basket part against restoring forces of the plurality of basket wires, and

the second configuration in the discharge mechanism is a state where the basket part is deformed so that the gap in the proximal region of the basket part have a substantial round shape against the restoring forces of the plurality of basket wires.

3. The basket-type grasping forceps according to claim 1, wherein

the discharge mechanism moves a proximal end of the basket part in a direction of approach to a distal end of the support member, thereby moving the object inside the basket part from the distal region of the basket part to the proximal region thereof.

4. The basket-type grasping forceps according to claim 1, wherein

the support member includes:

a body wire that is coupled to a distal end of the basket part and extends to the vicinity of a proximal end of the basket part;

a first locking part that is fixed to a proximal end of the body wire and has a larger outside dimension than the external diameter of the body wire; and

a second locking part that is fixed to the body wire at a position apart from the first locking part further to a distal side than the first locking part and has a larger outside dimension than the external diameter of the body wire,

the operating section includes;

a restricting member that has a through-hole of a diameter such that the body wire is advanceable and retractable through the through-hole and is disposed between the first locking part and the second locking part in a state where the body wire is inserted through the through-hole; and

a restricting wire that has a distal end part fixed to the restricting member and extends to the operating section through the inside of the insertion section, and

movement of the body wire to a proximal side with respect to the insertion section is restricted by fixing the advance/retraction position of the restricting wire in a state where the restricting member abuts against the second locking part, and movement of the body wire to a distal side with respect to the insertion section is restricted by fixing the advance/retraction position of the restricting wire in a state where the restricting member abuts against the first locking part.

5. The basket-type grasping forceps according to claim 1, wherein the basket wires are made of a shape memory alloy.

6. The basket-type grasping forceps according to claim 1, wherein

the basket part includes a binding part that binds distal portions of the basket wires,

the coupling member is coupled to a distal side of the binding part with a wire, and

the support member passes through the inside of the basket part at a position offset further in an outer circumferential direction than the centerline of the basket part with respect to the binding part.