Ablation needle device and high-frequency ablation treatment system for tumor

Patent metadata

Field	Value
Publication number	US-11534236-B2
Application number	US-202016894785-A
Country	US
Kind code	B2
Filing date	Jun 6, 2020
Priority date	Dec 11, 2017
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

An ablation needle device can maintain flexibility of an injection needle even when the length of an electrode constituted at a distal end portion thereof is increased and can perform cooling with small nonuniformity in the electrode during ablation. The ablation needle device includes: a hollow needle that is composed of a proximal end portion that is insulation-coated and a distal end portion constituting an electrode; a hub that includes a liquid injection port and a discharge port; an electric connector; a thermocouple; and cooling liquid introducing pipes each of which extends in the inside of the hollow needle, each of which has a distal end positioned in the inside of the distal end portion of the hollow needle, and each of which ejects liquid injected from the injection port from a distal end opening thereof.

First claim

The invention claimed is:

1. An ablation needle device for performing high-frequency ablation treatment of a tumor, comprising:
a hollow needle that is made of a metal and that is composed of a proximal end portion having an outer surface that is insulation-coated with a resin and a distal end portion having an outer surface that is exposed and thus constituting an electrode;
a hub that is attached to a proximal end side of the hollow needle and that includes a liquid injection Port for injecting liquid for cooling the electrode and supplying the liquid to an inside of the hollow needle, and a liquid discharge port for discharging liquid that has co led the electrode and returned from the inside of the hollow needle;
an electric connector that is electrically connected to the hollow needle in order to supply a nigh-frequency electric current to the electrode;
a thermocouple that extends in the inside of the hollow needle in order to measure a temperature of a tissue around the electrode; and
a plurality of cooling introducing pipes each of which extends in an inside of the hub and the inside of the hollow needle, each of which has a distal end positioned in an inside of the distal end portion of the hollow needle, and each of which ejects liquid injected from the injection port from a distal end opening thereof,
wherein the hollow needle is given flexibility by forming a helical slit in at least a distal end region of the proximal end portion of the hollow needle and the distal end portion,
wherein a liquid-tightness of the inside of the hollow needle is ensured by applying waterproofing to an inner surface of the hollow needle in at least a region in which the slit is formed in the distal end portion and by closing a distal end of the hollow needle, and
wherein distal end opening positions of the plurality of cooling liquid introducing pipes differ from each ether in a distal-proximal direction of the hollow.

2. The ablation needle device according to claim 1 , wherein the hub includes a liquid flow port that includes both of the injection port and the discharge port.

3. The ablation needle device according to claim 1 , comprising:
a first cooling liquid introducing pipe that extends in the inside of the hub and the inside of the hollow needle, that has a distal end positioned in the inside of the distal end portion of the hollow needle, and that ejects liquid injected from the injection port from a distal end opening thereof; and
a second cooling liquid introducing pipe that extends in the inside of the hub and the inside of the hollow needle together with the first cooling liquid introducing pipe, that has a distal end positioned in the inside of the distal end portion of the hollow needle, and that ejects liquid injected from the injection port from a distal end opening thereof,
wherein the distal end opening position of the first cooling liquid introducing pipe and the distal end opening position of the second cooling liquid introducing pipe differ from each other in the distal-proximal direction of the hollow needle, and wherein the plurality of cooling liquid introducing pipes include the first cooling liquid introducing pipe and the second cooling liquid introducing pipe.

4. The ablation needle device according to claim 3 , wherein the distal end opening of the first cooling liquid introducing pipe is positioned in an inside of a vicinity of distal end of the distal end portion of the hollow needle, and the distal end opening of the second cooling liquid introducing pipe is positioned in an inside of an approximately middle part or a vicinity of a proximal end of the distal end portion of the hollow needle.

5. The ablation needle device according to claim 1 ,
wherein the distal end of the hollow needle is closed by a distal end tip that is made of a resin, and
wherein a temperature measuring junction of the thermocouple is embedded in the distal end tip.

6. The ablation needle device according to claim 1 , wherein a lumen tube that forms a guidewire lumen extends in the inside of the hollow needle.

7. The ablation needle device according to claim 1 , wherein a length of the electrode constituted by the distal end portion of the hollow needle is 6 to 30 mm.

8. The ablation needle device according to claim 1 , wherein a pitch of the slit formed in the hollow needle continuously or intermittently decreases in a distal end direction.

9. The ablation needle device according to claim 1 , wherein, in at least the region in which the slit is formed in the distal end portion, a waterproof seal coating is formed on the inner surface of the hollow needle.

10. The ablation needle device according to claim 9 , wherein the waterproof seal coating is formed by a heat-expandable resin tube that increases its diameter by being heated, which is in a state of having been inserted to the inside of the hollow needle.

11. The ablation needle device according to claim 1 , wherein the hollow needle is configured to be transvenously introduced into an adrenal gland for performing an ablation treatment of an adrenal gland tumor.

12. A high-frequency ablation treatment system for a tumor, comprising:
the ablation needle device according to claim 1 ;
a high-frequency electric power source device connected to the electric connector;
a patient plate connected to the high-frequency electric power source device;
a guiding catheter for guiding the distal end portion of the hollow needle to a vicinity of a target site; and
a cooling liquid circulation mechanism that includes a cooling liquid supply pump that injects cooling liquid into the injection port of the hub in order to cool the electrode of the ablation needle device, and a recovery tank that recovers liquid that has cooled the electrode and returned from the inside of the hollow needle to the inside of the hub from the discharge port and cools the liquid again.

Assignees

• Japan Lifeline Co Ltd

Inventors

• Mori Kenji

Classifications

• A61B18/14

  Probes or electrodes therefor · CPC title

• A61B18/1477 Primary

  Needle-like probes · CPC title

• A61B2018/00821

  measured by a thermocouple · CPC title

• A61B2018/00023

  closed, i.e. without wound contact by the fluid · CPC title

• A61B2017/00292

  mounted on or guided by flexible, e.g. catheter-like, means · CPC title