Catheter comprising PTFE liner
The present disclosure provides catheters comprising polytetrafluoroethylene (PTFE) tubes with advantageous combinations of strength, flexibility, and size. Such tubes can exhibit features including an average wall thickness of 0.001″ or less, a tensile stress at break of greater than 5000 psi, and a storage modulus of less than 100,000 psi at 37° C. These tubes can be also be provided independently (i.e., not within a catheter) and can be employed in various applications.
1. A catheter comprising a passageway surrounded by walls, and further comprising a polytetrafluoroethylene (PTFE) tubular liner within the passageway, the PTFE tubular liner comprising:
a. an average wall thickness of 0.001 inch or less; and
b. a tensile stress at break greater than 5000 psi; and
c. a storage modulus of less than 100,000 psi at 23° C.
2. The catheter of claim 1 , wherein the average wall thickness of the PTFE tubular liner is 0.0002 inch to 0.0008 inch.
3. The catheter of claim 1 , wherein the PTFE tubular liner exhibits a change in the storage modulus between 23° C. and 37° C. of 3,000 psi/° C. or less.
4. The catheter of claim 1 , wherein the PTFE tubular liner comprises an abrasion-resistant surface.
5. The catheter of claim 1 , wherein the PTFE tubular liner comprises a lubricious surface.
6. A polytetrafluoroethylene (PTFE) tube comprising:
a. an average wall thickness of 0.001 inch or less; and
b. a tensile stress at break greater than 5000 psi; and
c. a storage modulus of less than 100,000 psi at 23° C.
7. The PTFE tube of claim 6 , wherein the average wall thickness is 0.0002 inch to 0.0008 inch.
8. The PTFE tube of claim 6 , wherein the tube exhibits a change in the storage modulus between 23° C. and 37° C. of 3,000 psi/° C. or less.
9. The PTFE tube of claim 6 , comprising an abrasion-resistant surface.
10. The PTFE tube of claim 6 , comprising a lubricious surface.
11. The PTFE tube of claim 6 comprised in a medical device.
12. The PTFE tube of claim 11 , wherein the medical device is a catheter.
13. The PTFE tube of claim 6 , having a characteristic tensile curve with two distinct segments between 0 to 50% elongation with a first segment having an average tensile modulus of 100,000 psi or less and a second segment having a tensile modulus of 25,000 psi or less but greater than 2,500 psi, wherein the PTFE tube has a tensile stress of 3000 psi or less at 5% elongation.
14. A polytetrafluoroethylene (PTFE) tube having a characteristic tensile curve with two distinct segments between 0 to 50% elongation with a first segment having an average tensile modulus of 100,000 psi or less and a second segment having a tensile modulus of 25,000 psi or less but greater than 2,500 psi, wherein the PTFE tube has a tensile stress of 3000 psi or less at 5% elongation.
15. The PTFE tube of claim 14 , wherein the tensile strength is 4000 psi or less at 10% elongation.
16. A PTFE layer over a metallic core, wherein the PTFE layer has an average thickness of about 0.001 inch or less, exhibiting an average tensile stress at break greater than 5,000 psi and an average storage modulus of less than 100,000 psi at 23° C.
17. The PTFE layer over the metallic core of claim 16 , wherein the metallic core and PTFE layer are both substantially cylindrical in shape.
18. The PTFE layer over the metallic core of claim 16 , comprising a minimum continuous length of 50 ft.
19. The PTFE layer over the metallic core of claim 16 , wherein the PTFE layer exhibits a change in storage modulus between 23° C. and 37° C. of 3,000 psi/° C. or less.
20. The PTFE layer over the metallic core of claim 16 , comprising abrasion resistance.
21. The PTFE layer over the metallic core of claim 16 , comprising a lubricious surface.
22. The catheter of claim 1 , prepared via extrusion without stretching as a secondary process after extrusion.
23. The catheter of claim 1 , prepared via paste extrusion over a metallic substrate.