US 12,447,318 B2
Balloon catheter
Jiahua Xiao, Guangdong (CN); and Yue Liu, Guangdong (CN)
Assigned to PIEDMONT MEDSYSTEMS (ZHUHAI) CO., LTD., Zhuhai (CN)
Appl. No. 17/596,243
Filed by PIEDMONT MEDSYSTEMS (ZHUHAI) CO., LTD., Guangdong (CN)
PCT Filed Nov. 14, 2019, PCT No. PCT/CN2019/118314
§ 371(c)(1), (2) Date Dec. 6, 2021,
PCT Pub. No. WO2020/244154, PCT Pub. Date Dec. 10, 2020.
Claims priority of application No. 201910492068.9 (CN), filed on Jun. 6, 2019.
Prior Publication US 2022/0339412 A1, Oct. 27, 2022
Int. Cl. A61M 25/10 (2013.01)
CPC A61M 25/1011 (2013.01) [A61M 25/10185 (2013.11); A61M 25/1025 (2013.01); A61M 2025/1013 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A balloon catheter, comprising:
a catheter; and
a balloon body sleeved on the catheter, wherein:
the balloon body comprises an inner layer balloon and an outer layer balloon which are both directly wrapped and fixed on the catheter;
the inner layer balloon is located inside the outer layer balloon such that a medium channel is formed between the inner and outer layer balloons for circulation flow of a heat-exchange medium;
the catheter includes:
an outer layer medium inlet hole and a medium backflow hole both in communication with the medium channel;
an inner layer medium inlet hole in communication with the inner layer balloon;
a medium inlet tube; and
a medium backflow tube;
the inner and outer layer medium inlet holes are both in communication with the medium inlet tube;
the medium backflow tube is in communication with the medium backflow hole;
an end of the medium inlet tube is a catheter proximal terminal end;
the inner layer medium inlet hole is located on a side of the outer layer medium inlet hole close to the catheter proximal terminal end;
the outer layer medium inlet hole is located at one end of the outer layer balloon away from the catheter proximal terminal end;
the medium backflow hole is located at the other end of the outer layer balloon close to the catheter proximal terminal end;
a control valve is disposed on the medium inlet tube between the inner and outer layer medium inlet holes; and
the control valve is a throttle check valve that can be opened under the action of pressure and is configured to control the flow direction of the heat-exchange medium to ensure that the heat-exchange medium first flows from the medium inlet tube into the inner layer balloon through the inner layer medium inlet hole, and then, when the pressure in the inner layer balloon becomes greater than a threshold, the control valve opens to allow the heat-exchange medium to flow from the medium inlet tube into the medium channel between the inner and outer layer balloons through the outer layer medium inlet hole and then flow back through the medium backflow hole, so as to realize the circulation flow of the heat-exchange medium in the medium channel for convective heat transfer.