Dual-channel injection bipolar high frequency electrosurgical knife

Patent metadata

Field	Value
Publication number	US-2021113260-A1
Application number	US-201816970584-A
Country	US
Kind code	A1
Filing date	Sep 7, 2018
Priority date	Mar 7, 2018
Publication date	Apr 22, 2021
Grant date	—

Abstract

Dual-channel injection bipolar high frequency electrosurgical knife comprises an electrode part, a main part and an operation part. The electrode part comprises an active electrode, an insulating part and an inert electrode. The active electrode has a hollow tubular portion, which can cut the target lesion tissue when power on. The main part comprises a protective tube, an insulation sheath and an insulation coated screw, connector, seal. The insulation coated screw includes a conductive screw and an insulating coating on the surface. The operation part comprises a positioning structure, a slider, a core rod, a connection sheath, an infusion tube and a connection cable. 6% Luer tapers are attached to both the positioning structure and the infusion tube. Liquid can flow out from the dual-channel, a solution can be injected in submucosal layer to elevate the mucous membrane tissue or clean hemorrhage site.

First claim

1 . A dual-channel injection bipolar high frequency electrosurgical knife comprising:
an electrode part, a main part and an operation part; wherein the electrode part is provided at a distal end of the bipolar high frequency electrosurgical knife, comprising an active electrode configured for cutting tissue and injecting liquid, an active electrode is configured to be extendable or retractable relative to a distal end of the main part, the active electrode has a hollow tubular portion extending in the axial direction and a protrusion provided at a distal end thereof, an insulating part covers an outer surface of the active electrode for isolating the active electrode from an inert electrode, and the insulating part includes a hollow tube and a protruding structure at least on one side, the hollow tube is larger than an outer diameter of the hollow tubular portion of the active electrode that allows liquid to flow between the active electrode and the insulating part, the inert electrode comprises a hollow tubular structure and a barb structure arranged at a distal end thereof, the barb structure is configured to be able to be engaged with the protruding structure of the insulating part; the main part is provided at a proximal end of the electrode part, including an insulation sheath, the insulation sheath comprises a first channel and a second channel, the first channel restrains the hollow tubular portion of the active electrode, a proximal end of the hollow tubular portion of the active electrode connects with an insulation coated screw by the connector, thereby providing a first liquid passageway, a seal covers the outer surface of the connector and the insulation coated screw, the lumen size formed is smaller than the first channel, thereby forming a second liquid passageway in the first channel, the second channel can restrains a wire that can pass through the insulation sheath which constituting the second channel, and connected to an inert electrode which is covering the distal outer surface of the insulation sheath; the operation part is provided at a proximal end of the main part, including a connection cable which is connected with the active electrode through the insulation coated screw and the inert electrode through the wire, and liquid inlets configured to make the liquid separately flow to the first liquid passageway and the second liquid passageway.

2 . The dual-channel injection bipolar high frequency electrosurgical knife according to claim 1 , wherein the active electrode is arranged at the distal end of the inert electrode, the length extending outwardly from the axis of the hollow tubular portion of the distal end of the active electrode is greater than the radius of the cross-section of the hollow tubular portion of the active electrode, the outwardly extending portion forms the protrusion at the distal end of the active electrode.

3 . The dual-channel injection bipolar high frequency electrosurgical knife according to claim 1 , wherein a cross section of protrusion is divergent distribution.

4 . The dual-channel injection bipolar high frequency electrosurgical knife according to claim 1 , wherein the surface of the active electrode, insulating part and inert electrode are covered with anti-blocking coating.

5 . The dual-channel injection bipolar high frequency electrosurgical knife according to claim 1 , wherein the first liquid passageway and the second liquid passageway have a mutual positional of being in parallel, coaxial, or wound.

6 . The dual-channel injection bipolar high frequency electrosurgical knife according to claim 1 , wherein the insulation coated screw including the conductive screw and the insulating coating on the surface of the screw, the conductive screw has elasticity and torque.

7 . The dual-channel injection bipolar high frequency electrosurgical knife according to claim 1 , wherein the insulation material is metal oxide.

8 . The dual-channel injection bipolar high frequency electrosurgical knife according to claim 7 , wherein the metal oxide is zirconia.

9 . The dual-channel injection bipolar high frequency electrosurgical knife according to claim 1 , wherein the insulation sheath has outer insulation sheath and inner insulation sheath.

10 . The dual-channel injection bipolar high frequency electrosurgical knife according to claim 9 , wherein at least one outer insulation sheath and the inner insulation sheath are connected to form a distal sealed second channel.

11 . The dual-channel injection bipolar high frequency electrosurgical knife according to claim 1 , wherein the outer surface of the connector has concave-convex structure.

12 . The dual-channel injection bipolar high frequency electrosurgical knife according to claim 9 , wherein the seal is covered by heat shrink, welding and adhesive bonding.

13 . The dual-channel injection bipolar high frequency electrosurgical knife according to claim 1 , wherein that when the active electrode is extended to the distal end and the distal surface of the seal comes into contact with the proximal surface of the insulating part, since the size of the tube formed by the sealant is larger than the hollow tube size of the insulating part, the active electrode cannot continue to extend to the distal end, thereby acting as a restriction function, when the active electrode is retracted to the proximal end, the protrusion of the active electrode touch the insulating part, since the size of the protrusion is larger than the hollow tube size of the insulating part, the active electrode cannot continue to be retracted to the proximal end, thereby acting as a restriction function.

14 . The dual-channel injection bipolar high frequency electrosurgical knife according to claim 1 , wherein the operating part is provided with a connection sheath, the distal end of the connection sheath is connected with the insulation coated screw, while the proximal end connected with the infusion tube, the proximal end of the infusion tube has a liquid inlet so that allow liquid to enter the first liquid passageway.

15 . The dual-channel injection bipolar high frequency electrosurgical knife according to claim 1 , wherein the operating part is provided with a core rod and a slider moving back and forth along the core rod, the slider can extend or retract the active electrode.

16 . The dual-channel injection bipolar high frequency electrosurgical knife according to claim 15 , wherein the operating part is provided with a positioning structure, the positioning structure has a liquid inlet so that allow liquid to enter the second liquid passageway.

17 . A dual-channel injection bipolar high frequency electrosurgical knife comprising:
an electrode part, a main part and an operation part; wherein the electrode part is provided at a distal end of the bipolar high frequency electrosurgical knife, comprising an active electrode configured for cutting tissue and injecting liquid, the active electrode is configured to be extendable or retractable relative to a distal end of the main part, and the active electrode has a hollow tubular portion extending in an axial direction, the insulating part covers an outer surface of the active electrode for isolating the active electrode from the inert electrode, including a hollow tube and a protruding structure at least on one side, the hollow tube is larger than an outer diameter of the hollow tubular portion of active electrode that allows liquid to flow between the active electrode and the insulating part, the inert electrode comprises a hollow tubular structure and a barb structure ar

Assignees

• Micro Tech Nanjing Co Ltd

Inventors

• Tang Zhi
• Fan Mingqiao
• Xie Huan
• Li Changqing
• Long Derong

Classifications

• A61B2018/126

  bipolar · CPC title

• A61B2018/00083

  low, i.e. electrically insulating · CPC title

• A61B18/14 Primary

  Probes or electrodes therefor · CPC title

• A61B2018/00601

  Cutting · CPC title

• A61B17/3478

  Endoscopic needles, e.g. for infusion (biopsy needles A61B10/0233; catheters with injection needles A61M25/0067) · CPC title