Evaluation of new Forcefield technology: reducing platelet adhesion and cell coverage of pyrolytic carbon surfaces.

INTRODUCTION

Platelet adhesion and activation are a significant source of clinical complications. Preventing foreign surface-platelet interaction may improve biocompatibility of implantable medical devices. This study evaluated efficacy of novel technique for electrically modifying surface of conductive biomaterial and attaching blood components to prevent thrombogenesis. Specifically, this new surface modification technology, Forcefield (ATS Medical, Inc, Minneapolis, Minn), was designed to prevent platelet adhesion on pyrolytic carbon. A modulated low-voltage current is directly applied to pyrolytic carbon surfaces to stimulate adherence of a layer of charged proteins from circulating blood components that is resistive to platelet deposition.

METHODS

Feasibility of Forcefield technology was tested in line with cardiopulmonary bypass circuit in patients undergoing standard cardiac surgery (n = 6). Forcefield treatment was applied to segment of pyrolytic carbon with 15 minutes (n = 3) and 30 minutes (n = 3) of electrically stimulated exposure time, and resulting segments were compared with untreated pyrolytic carbon segment. Platelet adhesion confluence was then quantified by scanning electron microscopy.

RESULTS

Confluence of the Forcefield-treated pyrolytic carbon segments (3.3% ± 2.2%) was significantly reduced relative to untreated pyrolytic carbon control segments (81.7% ± 24%, P < .001). There were no discernible differences in cell confluence with Forcefield-treated segments as function of exposure time (15 or 30 minutes).

CONCLUSIONS

Forcefield technology may enable modification of pyrolytic carbon surfaces to prevent platelet adhesion and thrombogenesis of implanted medical devices, including heart valves, stents, catheters, and ventricular assist devices, and may eliminate the need for anticoagulant and antiplatelet therapies.