Nitric oxide-generating silicone as a blood-contacting biomaterial

Area of Science:

• Biomaterials Science
• Surface Chemistry
• Hemostasis

Background:

• Blood coagulation on biomaterials is a significant challenge for medical devices.
• Developing surfaces that locally inhibit coagulation is crucial for clinical success.

Purpose of the Study:

• To investigate copper(II)-doped silicone surfaces for nitric oxide (NO) generation.
• To evaluate the ability of these surfaces to inhibit blood coagulation.

Main Methods:

• Silicone was doped with copper [Cu(0)] particles to create Cu/silicone polymeric matrix composites (Cu/Si PMCs).
• Surface copper expression and NO flux were quantified using chemiluminescence.
• Blood clotting times were measured, and clot morphology was analyzed via scanning electron microscopy (SEM).

Main Results:

• NO flux increased with surface copper expression, following the relationship J(NO) = (1.63%SA(Cu) - 0.81) × 10(-11).
• A 10 wt% Cu doping resulted in a NO flux of 5.35 ± 0.74 × 10(-10) mol·cm(-2)·min(-1).
• Clotting time increased significantly from 80 ± 13 seconds for pure silicone to 339 ± 44 seconds for 10 wt% Cu(II) doped surfaces.

Conclusions:

• Cu/Si PMCs demonstrate a dose-dependent inhibition of coagulation.
• The anti-coagulant effect is directly related to the extent of copper exposure on the surface.
• This approach shows promise for improving the hemocompatibility of blood-contacting biomaterials.