Claims
- 1. A flexible, multilayered tube comprising
- a) a first layer consisting essentially of a non-porous structure comprised of polytetrafluoroethylene, said non-porous structure having a thickness of less than 300 micrometers and having an outer peripheral surface: and
- b) a second layer comprised of a porous polytetrafluoroethylene structure laminated onto the outer peripheral surface of said first layer, and having a porosity of about 30 to 70 percent;
- wherein the thickness of the first layer is 1/1000 to 1/2 of the combined thickness of the first layer and second layer.
- 2. A flexible, multilayered tube described in claim 1 wherein the first layer and second layer are laminated by fusion under heat.
- 3. A flexible, multilayered tube described in claim 1 wherein the first layer and second layer are laminated via an adhesive interlayer.
- 4. The flexible, multilayered tube described in claim 3, wherein the adhesive interlayer is a thermoplastic fluorine resin.
- 5. The flexible, multilayered tube described in claim 1, wherein the first layer comprises at least two layers of polytetrafluoroethylene laminated by an adhesive.
- 6. The flexible, multilayered tube described in claim 2, wherein the first layer comprises at least two layers of polytetrafluoroethylene laminated by an adhesive.
- 7. The flexible, multilayered tube described in claim 3, wherein the first layer comprises at least two layers of polytetrafluoroethylene laminated by an adhesive.
- 8. The flexible, multilayered tube described in claim 5, wherein the adhesive is a thermoplastic fluorine resin.
- 9. The flexible, multilayered tube described in claim 6, wherein the adhesive is a thermoplastic fluorine resin.
- 10. The flexible, multilayered tube described in claim 7, wherein the adhesive is a thermoplastic fluorine resin.
- 11. The flexible, multilayered tube described in claim 1, wherein the first layer comprises porous polytetrafluoroethylene film made non-porous with a thermoplastic fluorine resin.
- 12. The flexible, multilayered tube described in claim 11 wherein the thermoplastic fluorine resin is a tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer.
- 13. The flexible, multilayered tube described in claim 11 wherein the thermoplastic fluorine resin is fluorinated ethylene propylene.
- 14. The flexible, multilayered tube described in claim 1, with a fourth layer comprised of porous polytetrafluoroethylene laminated onto the outer peripheral surface of the second layer via a third layer consisting of an airtight material.
- 15. The flexible, multilayered tube described in claim 2, with a fourth layer comprised of porous polytetrafluoroethylene laminated onto the outer peripheral surface of the second layer via a third layer consisting of an airtight material.
- 16. The flexible, multilayered tube described in claim 3, with a fourth layer comprised of porous polytetrafluoroethylene laminated onto the outer peripheral surface of the second layer via a third layer consisting of an airtight material.
- 17. A medical tubing comprising the flexible, multilayered tube described in claim 1.
- 18. A medical tubing comprising the flexible, multilayered tube described in claim 2.
- 19. A medical tubing comprising the flexible, multilayered tube described in claim 3.
- 20. A medical tubing comprising the flexible, multilayered tube described in claim 14.
- 21. A tube for an endoscope comprising the flexible, multilayered tube described in claim 1.
- 22. A tube for an endoscope comprising the flexible, multilayered tube described in claim 2.
- 23. A tube for an endoscope comprising the flexible, multilayered tube described in claim 3.
- 24. A tube for an endoscope comprising the flexible, multilayered tube described in claim 14.
- 25. A flexible, multi-layered tube comprising;
- a) a first, inner layer comprising a tubular polytetrafluoroethylene structure having inner and outer surfaces and a substantially uniform thickness of less than 300 microns therebetween, wherein the structure is substantially non-porous between the inner and outer surfaces of the first, inner layer; and
- b) a second layer laminated onto the outer surface of the first, inner layer, said second layer comprising a tubular polytetrafluoroethylene structure having inner and outer surfaces and further having substantially uniform porosity of about 30 to 70 percent between the inner and outer surfaces of the second layer;
- wherein the first and second layers have a combined thickness and the substantially uniform thickness of the first layer is 1/1000 to 1/2 of the combined thickness of the first and second layers.
Parent Case Info
This application is a continuation, of application Ser. No. 08/178,371 filed Dec. 21, 1993, now abandoned.
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EPX |
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Continuations (1)
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Number |
Date |
Country |
Parent |
178371 |
Dec 1993 |
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