Highly porous self-cohered web materials
First Claim
1. An implantable thrombogenic article comprising melt-formed abraded filaments and continuous melt-formed filaments to form a porous web material, wherein said material is formed by self-cohering filaments to each other at multiple contact points and then subjecting the material to a carding procedure where at least some of the filaments are engaged and separated from each other, wherein said filaments comprise at least one semi-crystalline polymeric component covalently bonded to or blended with at least one amorphous polymeric component, wherein the filaments possess partial to full polymeric component phase immiscibility when in a crystalline state, wherein said implantable article has a percent porosity greater than ninety absent inclusion of any fillers or other added components that may effectively reduce said porosity, and a relative blood clot time value of approximately 0.7 when compared to the positive citrated calcium control value of 1.0.
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Accused Products
Abstract
The present invention is directed to implantable bioabsorbable non-woven self-cohered web materials having a very high degree of porosity. The web materials are very supple and soft, while exhibiting proportionally increased mechanical strength in one or more directions. The web materials often possess a high degree of loft. The web materials can be formed into a variety of shapes and forms suitable for use as implantable medical devices or components thereof. In some embodiments, the web materials exhibit significant thrombogenic properties.
843 Citations
18 Claims
- 1. An implantable thrombogenic article comprising melt-formed abraded filaments and continuous melt-formed filaments to form a porous web material, wherein said material is formed by self-cohering filaments to each other at multiple contact points and then subjecting the material to a carding procedure where at least some of the filaments are engaged and separated from each other, wherein said filaments comprise at least one semi-crystalline polymeric component covalently bonded to or blended with at least one amorphous polymeric component, wherein the filaments possess partial to full polymeric component phase immiscibility when in a crystalline state, wherein said implantable article has a percent porosity greater than ninety absent inclusion of any fillers or other added components that may effectively reduce said porosity, and a relative blood clot time value of approximately 0.7 when compared to the positive citrated calcium control value of 1.0.
- 10. An implantable thrombogenic article comprising melt-formed abraded filaments and continuous melt-formed filaments to form a porous web material, wherein said material is formed by self-cohering filaments to each other at multiple contact points and then subjecting the material to a carding procedure where at least some of the filaments are engaged and separated from each other, wherein said filaments comprise a first semi-crystalline polymeric component covalently bonded to or blended with at least one additional semi-crystalline polymeric component, wherein the filaments possess partial to full polymeric component phase immiscibility when in a crystalline state, wherein said implantable article has a percent porosity greater than ninety absent inclusion of any fillers or other added components that may effectively reduce said porosity, and a relative blood clot time value of approximately 0.7 when compared to the positive citrated calcium control value of 1.0.
Specification