US 5,669,905 A · Endovascular embolic device detachment detection method and apparatus

Abstract

This invention is a method for ensuring for endovascular occlusion through the formation of thrombi in arteries, veins, aneurysms, vascular malformations, and arteriovenous fistulas. In particular, it deals with a method to predictably determine the instant of electrolytic detachment of an embolic device which is introduced to and is intended to remain at the desired thrombus formation site. The invention further includes a method for delivering an embolic device and detecting its electrolytic separation. According to the present invention, DC power with AC superposition is delivered to the sacrificial link that couples a delivery member (e.g., a guidewire) to an occlusion device. The impedance (as measured by the amplitude of the superposed AC) is monitored. When a predetermined change in that impedance (or amplitude occurs), which indicates coil detachment, the DC power is interrupted to minimize or avoid further electrolysis.

Claims22

Dependent claims

An implant detachment detection system comprising:

an implant suitable for implanting in a mammal;
a delivery member for delivering the implant to a selected site in the mammal;
a link coupling said delivery member to said implant;
a power supply circuit for supplying DC power with AC power superposed thereon;
a conductive path, said power supply circuit and link being in said path;
and
an AC impedance monitoring circuit coupled to said path.

4 more elements

Dependencies are inferred from the claim text.

Endovascular embolic device detachment detection method and apparatus

Life of this patent

Endovascular embolic device detachment detection method and apparatus

Life of this patent

Abstract

Claims22