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US 12,458,484 B2Granted
Layered medical appliances and methods
AssigneeMerit Medical Systems, Inc.
InventorsJohn Hall, Wayne Mower, Rachel Simmons, Bart Dolmatch
Life of this patent
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Abstract
Medical appliances may be formed of multilayered constructs. The layers of the constructs may be configured with various physical properties or characteristics. The disposition and arrangement of each layer may be configured to create an overall construct with a combination of the individual properties of the layers. Constructs may be used to create vascular prostheses or other medical devices.
Claims15
A covered stent, comprising:
- a scaffolding structure comprising a midsection and an end section;
- and
- a cover coupled to the scaffolding structure, comprising a multi-layer construct comprising:
- an inner layer of rotational spun polytetrafluoroethylene (PTFE) comprising a plurality of pores;
- an outer layer of expanded PTFE comprising a plurality of pores with an average internodal distance less than 80 microns;
- and
- a tie layer disposed between the inner layer and the outer layer,
- wherein the scaffolding structure is disposed between the inner layer and the outer layer, and
- wherein each layer of PTFE in the multi-layer construct comprises pores larger than 8 microns, wherein the multi-layer construct comprises a tortuous path through the pores from an inner surface to an outer surface of the multi-layer construct, and wherein the multi-layer construct is configured to be impermeable to red blood cell migration across the multi-layer construct.
6 more elements
A covered stent, comprising:
- a scaffolding structure comprising a midsection and an end section,
- wherein a resistance to radial compression of the midsection is greater than a resistance to radial compression of the end section;
- and
- a cover coupled to the scaffolding structure, comprising:
- an inner layer of rotational spun polytetrafluoroethylene (PTFE) comprising a plurality of pores;
- an outer layer of expanded PTFE comprising a plurality of pores with an average internodal distance less than 80 microns;
- and
- a tie layer disposed between the inner layer and the outer layer,
- wherein the scaffolding structure is disposed between the inner layer and the outer layer, and
- wherein each layer of PTFE in the multi-layer construct comprises pores larger than 8 microns, wherein the cover comprises a tortuous path through the pores from an inner surface to an outer surface of the cover, and wherein the cover is configured to be impermeable to red blood cell migration across the cover.
7 more elements
Dependencies are inferred from the claim text.