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

Claim 0:
1. 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 of 0.07 to 0.25 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;
wrapping a coil over at least a segment of the PTFE liner; and
disposing a sheath over the coil.