Dual-channel injection bipolar high frequency electrosurgical knife

Patent metadata

Field	Value
Publication number	US-12035960-B2
Application number	US-201816970584-A
Country	US
Kind code	B2
Filing date	Sep 7, 2018
Priority date	Mar 7, 2018
Publication date	Jul 16, 2024
Grant date	Jul 16, 2024

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

What is claimed is:

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, the 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 an 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 of the inert electrode, and 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 a connector, thereby providing a first liquid passageway, a seal covers an outer surface of the connector and the insulation coated screw, wherein a size of the seal is smaller than the first channel, thereby forming a second liquid passageway in the first channel, the second channel restrains a wire that can pass through the insulation sheath constituting the second channel, and the wire is connected to the inert electrode, which covers a 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 a first liquid inlet and a second liquid inlet 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, and the protrusion extends outwardly from an axis of the hollow tubular portion of the distal end of the active electrode by a greater distance than a radius of a cross-section of the hollow tubular portion of the active electrode.

3. The dual-channel injection bipolar high frequency electrosurgical knife according to claim 2 , wherein a cross section of the protrusion is a divergent distribution.

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

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

6. 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 position of being in parallel, coaxial, or wound.

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

8. The dual-channel injection bipolar high frequency electrosurgical knife according to claim 1 , wherein a material of the insulating part is metal oxide.

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

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

11. The dual-channel injection bipolar high frequency electrosurgical knife according to claim 10 , wherein the outer insulation sheath and the inner insulation sheath are connected to form the second channel which is sealed distally.

12. The dual-channel injection bipolar high frequency electrosurgical knife according to claim 10 , 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 the outer surface of the connector has concave-convex structure.

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

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

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

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

18. 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, an insulating part covers an outer surface of the active electrode for isolating the active electrode from an inert electrode, the insulating part including a hollow tube and a protruding structure at least on on

Assignees

• Micro Tech Nanjing Co Ltd

Inventors

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

Classifications

• A61M5/19

  having more than one chamber {, e.g. including a manifold coupling two parallelly aligned syringes through separate channels to a common discharge assembly (surgical glue applicators A61B17/00491)} · CPC title

• A61M5/1407

  Infusion of two or more substances · CPC title

• A61B2018/1475

  Electrodes retractable in or deployable from a housing · CPC title

• A61B2018/1412

  Blade · CPC title

• A61B2018/126

  bipolar · CPC title