US 11,925,766 B2
Microcatheter with modified PTFE liner
James Q. Dinh, Irvine, CA (US); Jeffrey J. Valko, San Clemente, CA (US); Brian M. Strauss, San Clemente, CA (US); and Adriana X. Peralta, Irvine, CA (US)
Assigned to Covidien LP, Mansfield, MA (US)
Filed by Covidien LP, Mansfield, MA (US)
Filed on Jul. 28, 2020, as Appl. No. 16/941,342.
Application 16/941,342 is a continuation of application No. 13/943,277, filed on Jul. 16, 2013, granted, now 10,953,193.
Prior Publication US 2020/0353206 A1, Nov. 12, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. A61B 17/221 (2006.01); A61M 25/00 (2006.01); A61M 25/16 (2006.01); A61B 17/12 (2006.01); A61F 2/95 (2013.01)
CPC A61M 25/0009 (2013.01) [A61M 25/0045 (2013.01); A61B 2017/1205 (2013.01); A61F 2/95 (2013.01); A61M 2025/0042 (2013.01); A61M 2025/0047 (2013.01); A61M 25/005 (2013.01); A61M 2025/0062 (2013.01)] 20 Claims
OG exemplary drawing
 
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.