Patent ID: 11925766
Assignee: COVIDIEN LP
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 14:
15. A method of making a catheter, the method comprising:
longitudinally stretching a portion of a PTFE tube having an initial length to a longer length that is 25% to 100% longer than the initial length of the portion to create a PTFE liner, wherein the PTFE liner has a tensile strength greater than 20 kilopound per square inch (kpsi), wherein the catheter is configured to deploy an expandable device, and wherein an internal surface of the PTFE liner has a radial coefficient of friction with respect to the expandable device, the radial coefficient of friction being a ratio of a radial force exerted by the expandable device on the PTFE liner to a force required to pull the expandable device through the PTFE liner when the expandable device is positioned within the catheter, wherein the portion of the PTFE tube has an initial radial coefficient of friction, and wherein the PTFE liner has a lower radial coefficient of friction that is decreased by at least about 20% of the initial radial coefficient of friction;
wrapping a coil over at least a segment of the PTFE liner; and
disposing a sheath over the coil.