Method for the radio frequency perforation and the enlargement of a body tissue

摘要

For creating a hole in body tissue and then enlarging the hole, a guidewire has a continuous diameter guidewire body having a proximal end and a distal end, a distal portion including an electrically conductive exposed tip for creating a perforation when RF current is applied and for preventing the creation of a perforation when RF current is not applied. For expanding the hole, a dilator region is provided between the distal end of the guidewire body and the distal portion for expanding the hole, and has a tapered profile. Also for expanding the hole, an inflatable balloon is located circumferentially on the guidewire body, and a catheter located on the guidewire body and in communication with the balloon for delivery of fluid to the balloon for its inflation.