The spray coating technique utilizes ultrasonic nozzles, providing the ability to control the properties of the coating, which makes it easy to adapt it to applications that require thin uniform coating.
Advantages over other techniques:
- Easy shaping of sprayed patterns, resulting in precise coating applications
- Highly uniform surfaces are required particularly for cardiovascular devices, whereas rough, uneven surfaces can cause turbulation and thrombosis
- Solvents are highly sensitive to dipping, and spray coating used instead
- Highly controllable spray produces reliable, consistent results
- Coating wall thickness: 10-100 microns
- Coating Tolerance: ± 3 microns
Electrospinning is a fiber production method which uses electric force to draw charged threads of polymer solutions to fiber diameters.
The electrospinning manufacturing process comprises of surface treatment sequence that enables strong adhesion forces between the substrate and the coating layer.
The end result is a fully encapsulated cover without any exposed metal surfaces.
- Fiber diameter range: 2 – 300 [nm]
- Porosity definition: 2-40 [nm]
Differentiations in pore size can impact :
- Tissue regrowth
- Cell adhesion
The main clinical application for this technology are in structural heart and peripheral angioplasty.