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

Claim 17:
18. A medical device comprising:
a catheter including a longitudinally-stretched PTFE liner formed from a portion of a PTFE tube that is longitudinally-stretched from an initial length to a longer length that is 25% to 100% longer than the initial length; and
an expandable device configured to position within the longitudinally-stretched PTFE liner,
wherein the expandable device is configured to exert a radial force on the longitudinally-stretched PTFE liner,
wherein the longitudinally-stretched PTFE liner has a tensile strength greater than 20 kilopound per square inch (kpsi),
wherein the expandable device is configured to be deployed from the catheter,
wherein an internal surface of the longitudinally-stretched PTFE liner has a radial coefficient of friction with respect to the expandable device, the radial coefficient of friction being a ratio of the radial force exerted by the expandable device on the longitudinally-stretched PTFE liner to a force required to pull the expandable device through the longitudinally-stretched PTFE liner when the expandable device is positioned within the catheter,
wherein an internal surface of the portion of the PTFE tube has an initial radial coefficient of friction with respect to the expandable device, and
wherein the longitudinally-stretched PTFE liner has a lower radial coefficient of friction that is decreased by at least about 20% of the initial radial coefficient of friction.