Implantable Device Coating and Membrane Development
Application of a coated membrane or covering to an implantable device offers several functional benefits. The most popular reason is to create a blood impermeable barrier, occluding blood flow to desired locations or creating an impermeable seal. A membrane may also inhibit ingrowth of a tumour or tissue, while enabling subsequent removal of the device, if needed. The application of porous holes to the membrane, in turn creates a filter design that can be used for embolic protection or as part of a retrieval devices.
These coverings can be extremely low profile, facilitating delivery to tortuous or distal anatomy, but also durable, overcoming stresses associated with a wide variety of implant designs, whether braided, laser cut frames, or fabrics. The choices for an elastomeric covering, such as silicones, polyurethanes and co-polymers, should be based on the following key selection criteria.