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US 9,655,710 B2Granted
Process of making a stent
AssigneeMerit Medical Systems, Inc.
InventorsZeke Eller, John William Hall, Robert S. Kellar, Rachel Lynn Simmons, Robert J. Radford, Bart Dolmatch
Life of this patent
Estimating the term…
Abstract
A stent or other prosthesis may be formed by coating a single continuous wire scaffold with a polymer coating. The polymer coating may consist of layers of electrospun polytetrafluoroethylene (PTFE). Electrospun PTFE of certain porosities may permit endothelial cell growth within the prosthesis.
Claims16
A method of constructing a stent, the method comprising:
- electrospinning a first tube of PTFE onto a rotating mandrel;
- heating the first tube to between 360° C. to 400° C.;
- applying a scaffolding structure around the first tube after the first tube has been heated;
- applying a fluorinated ethylene propylene (FEP) layer around the first tube and the scaffolding structure;
- and
- applying a second tube of porous PTFE around the FEP layer;
- applying a compressive wrap around the second tube;
- and
- heat-treating the stent above the melting temperature of FEP but below 325° C. while the compressive wrap is disposed around the second tube;
- wherein the first tube of PTFE is an innermost tube of he stent that is configured for contact with bodily fluid.
7 more elements
A method of constructing a stent covering, the method comprising:
- electrospinning a first tube of PTFE onto a rotating mandrel;
- heating the first tube to between 360° C. to 400° C.;
- applying a tie layer around the first tube after the first tube has been heated;
- applying a second tube of PTFE around the tie layer;
- applying a compressive wrap around the second tube;
- and
- heat-treating the stent covering above the melting temperature of the tie layer but below the 325° C. while the compressive wrap is disposed around the second tube;
- wherein the first tube of PTFE is an innermost tube of the stent that is configured for contact with bodily fluid.
5 more elements
Dependencies are inferred from the claim text.