Highly porous self-cohered web materials having haemostatic properties
The present invention is directed to implantable bioabsorbable non-woven self-cohered web materials having a 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. The web materials possess haemostatic properties.
1. An implantable article comprising melt-formed abraded bioabsorbable filaments and melt-formed continuous bioabsorbable 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, and 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 non-bioabsorbable material releasably attached to a population of said melt-formed filaments.
2. The implantable article of claim 1 wherein the percent porosity is greater than ninety-one absent inclusion of any fillers or other added components that may effectively reduce said porosity.
3. The implantable article of claim 1 wherein the at least one semi-crystalline polymeric component is covalently bonded to at least one amorphous polymeric component.
4. The implantable article of claim 3 wherein the components comprise a block copolymer.
5. The implantable article of claim 1 wherein the at least one semi-crystalline polymeric component is blended with the at least one amorphous polymeric component.
6. The implantable article of claim 5 wherein at least one of the components is a block co-polymer.
7. The implantable article of claim 1 wherein at least one semi-crystalline polymeric component has a melting point greater than eighty degrees centigrade (80° C.).
8. The implantable article of claim 1 wherein said non-bioabsorbable material comprises a fluoropolymer.
9. The implantable article of claim 8 wherein said fluoropolymer is polytetrafluoroethylene.
10. The implantable article of claim 1 wherein said non-bioabsorbable material has a side that is a barrier to cellular ingrowth.
11. The implantable article of claim 10 wherein said population of filaments is attached to said side of said non-bioabsorbable sheet material that is a barrier to cellular ingrowth.
12. The implantable article of claim 1 in the form of a substantially planar sheet.
13. The implantable article of claim 1 in the form a two or more planar sheets.
14. The implantable article of claim 13 wherein said sheets are attached together to form a laminate.
15. An implantable article comprising melt-formed abraded bioabsorbable filaments and melt-formed continuous bioabsorbable 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 additional semi-crystalline polymeric component, wherein the filaments possess partial to full polymeric component phase immiscibility when in a crystalline state, and 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 non-bioabsorbable material releasably attached to a population of said melt-formed filaments.
16. The implantable article of claim 15 wherein the percent porosity is greater than ninety-one absent inclusion of any fillers or other added components that may effectively reduce said porosity.
17. The implantable article of claim 15 wherein the at least one semi-crystalline polymeric component is covalently bonded to at least one amorphous polymeric component.
18. The implantable article of claim 17 wherein the components comprise a block copolymer.
19. The implantable article of claim 15 wherein the at least one semi-crystalline polymeric component is blended with the at least one amorphous polymeric component.
20. The implantable article of claim 19 wherein at least one of the components is a block co-polymer.
21. The implantable article of claim 15 wherein at least one semi-crystalline polymeric component has a melting point greater than eighty degrees centigrade (80° C.).
22. The implantable article of claim 15 wherein said non-bioabsorbable material is a fluoropolymer.
23. The implantable article of claim 22 wherein said fluoropolymer comprises polytetrafluoroethylene.