US 12,245,801 B2
Adjustable cryoablation needle
Chi Yang, Shanghai (CN); Binkai Xu, Shanghai (CN); Yinlong Wu, Shanghai (CN); and Zhaohua Chang, Shanghai (CN)
Assigned to ACCU TARGET MEDIPHARMA (SHANGHAI) CO., LTD., Shanghai (JP)
Appl. No. 17/431,829
Filed by ACCU TARGET MEDIPHARMA (SHANGHAI) CO., LTD., Shanghai (CN)
PCT Filed Jun. 17, 2020, PCT No. PCT/CN2020/096608
§ 371(c)(1), (2) Date Aug. 18, 2021,
PCT Pub. No. WO2021/027397, PCT Pub. Date Feb. 18, 2021.
Claims priority of application No. 201910742034.0 (CN), filed on Aug. 13, 2019.
Prior Publication US 2022/0160412 A1, May 26, 2022
Int. Cl. A61B 18/02 (2006.01); A61B 17/00 (2006.01); A61B 18/00 (2006.01)
CPC A61B 18/02 (2013.01) [A61B 2017/00424 (2013.01); A61B 2017/00867 (2013.01); A61B 2018/00101 (2013.01); A61B 2018/00577 (2013.01); A61B 2018/0262 (2013.01); A61B 2018/0293 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An adjustable cryoablation needle, comprising a needle rod, a front-segment heat-insulated tube and a gas inlet structure penetrating the needle rod and the front-segment heat-insulated tube,
wherein the front-segment heat-insulated tube is inserted into the needle rod from a rear end of the needle rod, the front-segment heat-insulated tube can move relative to the needle rod in the axial direction of the needle rod, the gas inlet structure comprises a first gas inlet tube and a spring-like second gas inlet tube, a front end of the first gas inlet tube extends to the needle rod, and a rear end of the first gas inlet tube is connected to the front end of the second gas inlet tube,
wherein the adjustable cryoablation needle further comprises a rear-segment heat-insulated tube, and the front-segment heat-insulated tube is connected to the rear-segment heat-insulated tube from a front end of the rear-segment heat-insulated tube;
the needle rod is configured to move relative to the rear-segment heat-insulated tube in the axial direction of the rear-segment heat-insulated tube, so as to adjust a first axial distance between the front end of the rear-segment heat-insulated tube and the front end of the needle rod;
the front-segment heat-insulated tube is configured to move relative to the rear-segment heat-insulated tube in the axial direction of the rear-segment heat-insulated tube, so as to adjust a second axial distance between the front end of the front-segment heat-insulated tube and the front end of the rear-segment heat-insulated tube;
wherein the length of an effective needle rod segment of the adjustable cryoablation needle changes with the first axial distance;
when the length of the effective needle rod segment changes, the front-segment heat-insulated tube is configured to move relative to the needle rod in the axial direction of the needle rod, so that the length of a targeting region of the adjustable cryoablation needle changes with the difference between the first axial distance and the second axial distance,
the position of the first gas inlet tube is fixed relative to the needle rod, the rear end of the second gas inlet tube is directly or indirectly connected to a gas inlet passage, the position of the gas inlet passage is fixed relative to the rear-segment heat-insulated tube, and the second gas inlet tube is configured to be compressed or stretched in the axial direction.