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| 국가/구분 | United States(US) Patent 등록 |
|---|---|
| 국제특허분류(IPC7판) |
|
| 출원번호 | US-0771214 (1996-12-20) |
| 발명자 / 주소 |
|
| 인용정보 | 피인용 횟수 : 329 인용 특허 : 76 |
A method of applying microwave energy to cardiac tissue uses a catheter adapted for insertion into a cardiac chamber and which includes a microwave antenna, a cooling lumen structure, and an inflatable cooling balloon. Necrosing levels of microwave energy are delivered from the microwave antenna to
A method of applying microwave energy to cardiac tissue uses a catheter adapted for insertion into a cardiac chamber and which includes a microwave antenna, a cooling lumen structure, and an inflatable cooling balloon. Necrosing levels of microwave energy are delivered from the microwave antenna to diseased cardiac tissue spaced from the catheter. Tissues immediately surrounding the catheter are cooled and microwave energy emitted by the antenna is selectively absorbed by the cooling lumen structure surrounding the antenna. The cooling balloon of the catheter is positioned adjacent the antenna and partially surrounds the cooling lumen structure on one side of the catheter to provide additional cooling capability and additional microwave energy absorption on the side of the catheter opposite the diseased cardiac tissue to prevent unwanted heating of blood within the cardiac chamber.
[ What is claimed is:] [1.] A method for treating a diseased portion of cardiac tissue comprising:inserting an intravascular catheter into a cardiovascular system including a microwave antenna disposed within an antenna lumen, a plurality of fluid flow lumens substantially surrounding the antenna lu
[ What is claimed is:] [1.] A method for treating a diseased portion of cardiac tissue comprising:inserting an intravascular catheter into a cardiovascular system including a microwave antenna disposed within an antenna lumen, a plurality of fluid flow lumens substantially surrounding the antenna lumen and a balloon having an inflatable portion which partially surrounds the antenna lumen, the balloon being in communication with the fluid flow lumens;advancing the catheter through the cardiovascular system with the balloon in a deflated state until a distal end of the catheter is within a ventricle of a heart and adjacent a diseased portion of cardiac tissue spaced from a wall of the ventricle;positioning the distal end of the catheter so that a first side of the catheter is immediately adjacent the diseased portion to be treated and a second side of the catheter is adjacent blood within the ventricle;cooling the ventricle by directing cooling fluid to flow through the fluid flow lumens to cool a surface of the ventricle wall adjacent the catheter first side and directing cooling fluid to flow through the balloon and the fluid flow lumens to cool blood within the ventricle adjacent the catheter second side; andheating the diseased portion of tissue spaced from a surface of the ventricle wall with microwave energy from the microwave antenna at a power range and for a time sufficient to necrose the diseased portion of tissue.
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