Controlling Coagulum Formation

摘要

Some embodiments of a medical instrument can be configured to reduce the formation of coagulum by delivering a negative charge bias to conductive surfaces that interface with blood or bodily tissue during a medical procedure. The application of the negative charge at the instrument-blood interface can reduce the fibrinogen deposition and the formation of coagulum because fibrinogen molecules in general are negatively charged at neutral pH levels. In addition, some embodiments of the instrument may be configured to irrigate the instrument-blood interface with RGD/ClfA peptides, a bicarbonate solution (or other high pH solution), or both to further repel the fibrinogen and thereby inhibit the formation of coagulum. Accordingly, some embodiments of the medical instrument can substantially reduce the risks of thromboembolism during particular medical procedures.

主权项

1. An ablation system, comprising:
an elongate catheter body having one or more electrodes exposed along a distal tip portion; a power control system to deliver ablation energy to the one or more electrodes when the distal tip portion is directed to a targeted tissue site, wherein the power control system also delivers a negative charge to the one or more electrodes so as to repel fibrinogen molecules away from the electrodes, the negative charge delivered to the one or more electrodes being different from and a supplement to the ablation energy.