IP Library › Granted Patent US 12702393

Granted Patent B2

US 12702393 · App. 18/538,371 · Granted Aug 11, 2026

Endoscopic treatment tool

Inventors: Yusuke Shiota (Machida, JP); Chika Miyajima (Hachioji, JP); Junichi Kogiso (Hachioji, JP); Yuya Hidaka (Hino, JP); Naoki Takizawa (Musashino, JP)

Assignee: OLYMPUS MEDICAL SYSTEMS CORP.

A61B17/00234 A61B18/1492 A61B2017/00269 A61B2018/00601 A61B2018/1475

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Quick Facts

Patent No.: US 12702393
App. No.: 18/538,371
Granted: Aug 11, 2026
Kind: B2

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Abstract

An endoscopic treatment may include a sheath extending in a longitudinal direction, a distal end member having insulation and the distal end member provided at a distal end of the sheath and having a through-hole penetrating in the longitudinal direction. The treatment tool may further include an electrode having a first conduit extending in the longitudinal direction and the electrode being configured to advance and retract into the through-hole. The electrode including a rod extending in the longitudinal direction and configured to be arranged in at least a part of the first conduit.

Claims (54)

1 . An endoscopic treatment tool, comprising:

a sheath extending in a longitudinal direction;

a distal end member having insulation and the distal end member provided at a distal end of the sheath and having a through-hole penetrating in the longitudinal direction;

an electrode having a first conduit extending in the longitudinal direction and the electrode being configured to advance and retract into the through-hole;

a hollow operation wire having a second conduit communicating with the first conduit in the longitudinal direction, wherein the hollow operation wire includes a distal end connected to the electrode;

an operation unit configured to advance and retract the hollow operation wire in the longitudinal direction, wherein the operation unit includes:

a slider connected to a proximal end of the hollow operation wire and configured to advance and retract the electrode in the longitudinal direction; and

a slide lever configured to advance and retract a rod relative to the electrode in the longitudinal direction; and

the rod extending in the longitudinal direction and configured to be arranged in at least a part of the first conduit, wherein, when the slide lever is fully retracted, a distal end of the rod is located proximally relative to a proximal end of the electrode.

2 . The endoscopic treatment tool according to claim 1 , wherein, when a distal end of the rod is located at a first position, at which a distal end opening of the first conduit is located, in the longitudinal direction, the distal end opening is sealed to prevent biological tissue from entering the first conduit through the distal end opening.

3 . The endoscopic treatment tool according to claim 1 , wherein, when the slide lever is fully retracted, the distal end of the rod is located within the hollow operation wire.

4 . The endoscopic treatment tool according to claim 1 , wherein:

when the slide lever is moved in a distal direction along the longitudinal direction, the distal end of the rod is disposed in the longitudinal direction at a first position where a distal end opening of the first conduit is located to seal the distal end opening; and

when the slide lever is moved in a proximal direction along the longitudinal direction, the distal end of the rod is disposed in the longitudinal direction at a second position closer to the proximal end than the distal end opening to open the distal end opening and enable water to flow through the first conduit.

5 . The endoscopic treatment tool according to claim 1 , wherein the rod is configured to extend and is movable forward and backward in the longitudinal direction.

6 . The endoscopic treatment tool according to claim 5 , wherein the rod includes:

a support column part extending in the longitudinal direction; and

7 . The endoscopic treatment tool according to claim 1 , wherein the rod includes a protrusion on an outer surface thereof, and when the slide lever is fully advanced, the protrusion is located inside the electrode.

8 . The endoscopic treatment tool according to claim 1 , wherein the rod includes a char removal portion configured to remove char adhering to the first conduit by moving the rod back and forth relative to the electrode.

9 . An endoscopic treatment tool, comprising:

a sheath extending in a longitudinal direction;

a distal end member having insulation and the distal end member provided at a distal end of the sheath and having a through-hole penetrating in the longitudinal direction;

an electrode having a first conduit extending in the longitudinal direction and the electrode being configured to advance and retract into the through-hole;

a hollow operation wire having a second conduit communicating with the first conduit in the longitudinal direction, wherein the hollow operation wire includes a distal end connected to the electrode;

an operation unit configured to advance and retract the hollow operation wire in the longitudinal direction, wherein the operation unit includes:

a slider connected to a proximal end of the hollow operation wire and configured to advance and retract the electrode in the longitudinal direction; and

a slide lever configured to advance and retract a rod relative to the electrode; and

the rod extending in the longitudinal direction and arranged in at least a part of the first conduit, wherein the rod includes:

a support column part extending in the longitudinal direction; and

a distal end part provided on a distal end side of the support column part and having an outer diameter larger than that of the support column part, wherein the distal end part is configured to move distally relative to a distal end opening of the first conduit, and wherein, when the slide lever is fully retracted, the distal end part of the rod is located proximally relative to a proximal end of the electrode.

10 . The endoscopic treatment tool according to claim 9 , wherein:

11 . The endoscopic treatment tool according to claim 10 , wherein the operation unit includes:

a stopper configured to regulate movement of the slide lever so as to limit a position of the distal end of the rod within a range between a distal end opening of the first conduit and the proximal end of the electrode.

12 . The endoscopic treatment tool according to claim 11 , wherein the distal end part is configured to seal the distal end opening to prevent biological tissue from entering the first conduit through the distal end opening.

13 . The endoscopic treatment tool according to claim 12 , wherein, when the slide lever is located proximally relative to the stopper, the distal end of the rod is located within the first conduit.

14 . An endoscopic treatment tool, comprising:

a sheath extending in a longitudinal direction;

a distal end member having insulation and the distal end member provided at a distal end of the sheath and having a through-hole penetrating in the longitudinal direction;

an electrode having a first conduit extending in the longitudinal direction and the electrode being configured to advance and retract into the through-hole;

a rod extending in the longitudinal direction and configured to be arranged in at least a part of the first conduit, wherein the rod includes a plug that seals a distal end opening of the first conduit;

a hollow operation wire having a second conduit communicating with the first conduit in the longitudinal direction, wherein the hollow operation wire includes a distal end connected to the electrode; and

an operation unit configured to advance and retract the hollow operation wire in the longitudinal direction, wherein the operation unit includes:

a slider connected to a proximal end of the hollow operation wire and configured to advance and retract the electrode in the longitudinal direction; and

a slide lever configured to advance and retract the rod relative to the electrode in the longitudinal direction, wherein when the slide lever is fully retracted, a distal end of the rod is located proximally relative to a proximal end of the electrode.

15 . The endoscopic treatment tool according to claim 14 , wherein, the operation unit further includes a stopper configured to regulate advancement and retraction of the slide lever along the longitudinal direction, wherein the distal end of the rod is located within the first conduit when the slide lever is located proximally relative to the stopper, and wherein the slide lever further includes a positioning surface configured to generate a resistance force between the slide lever and the operation unit when the distal end of the rod protrudes from a distal end opening of the first conduit.

16 . The endoscopic treatment tool according to claim 14 , wherein the plug includes:

a support column part extending in the longitudinal direction;

a protrusion configured to remove biological tissue adhered to the first conduit.

17 . The endoscopic treatment tool according to claim 16 , wherein the distal end part is configured to seal the distal end opening to prevent biological tissue from entering the first conduit through the distal end opening.

18 . The endoscopic treatment tool according to claim 15 , wherein the stopper is detachably attached to the operation unit and configured to regulate movement of the slide lever so as to limit a position of the distal end of the rod within a range between a distal end opening of the first conduit and the proximal end of the electrode, wherein, when the slide lever is located proximally relative to the stopper, the distal end of the rod is located within the first conduit, wherein when the stopper is attached to the operation unit, the rod is in a regulated state in which a range in which the distal end of the rod advances or retracts is limited to a range located between the distal end opening and the proximal end of the electrode, and wherein when the stopper is detached from the operation unit, the rod is in a protruding state in which the distal end of the rod protrudes distally relative to the distal end opening.