US 12,144,940 B2
Aspiration catheter systems and methods of use
Tony M. Chou, San Mateo, CA (US); Joey English, San Mateo, CA (US); Warren T. Kim, San Mateo, CA (US); and Ian J. Clark, San Rafael, CA (US)
Assigned to Route 92 Medical, Inc., San Mateo, CA (US)
Filed by Route 92 Medical, Inc., San Mateo, CA (US)
Filed on Apr. 7, 2023, as Appl. No. 18/297,450.
Application 18/297,450 is a continuation of application No. 17/497,713, filed on Oct. 8, 2021.
Claims priority of provisional application 63/089,987, filed on Oct. 9, 2020.
Prior Publication US 2023/0263995 A1, Aug. 24, 2023
Int. Cl. A61M 25/01 (2006.01); A61B 17/12 (2006.01); A61M 25/09 (2006.01)
CPC A61M 25/0133 (2013.01) [A61B 17/12109 (2013.01); A61M 25/0108 (2013.01); A61M 25/09 (2013.01)] 27 Claims
OG exemplary drawing
 
1. A method of treating a cerebral vessel of a patient, the method comprising:
assembling a system of devices, the assembled system of devices comprising:
an outer catheter having a catheter lumen and a distal end; and
an inner catheter extending through the catheter lumen comprising a non-expandable flexible elongate body having a tapered distal end region that extends distal to the distal end of the outer catheter, and wherein the non-expandable flexible elongate body substantially fills the catheter lumen along a length to create a piston arrangement and wherein the tapered distal end region tapers from a first outer diameter to a second outer diameter, the second outer diameter located distal to and being smaller than the first outer diameter;
advancing the outer catheter towards an occlusion site having occlusive material lodged in a cerebral vessel of a patient to position the distal end of the outer catheter at a first location relative to the occlusion site;
withdrawing the inner catheter from within the catheter lumen with a velocity;
creating an aspiration pressure at the distal end of the outer catheter with the piston arrangement, the aspiration pressure sufficient to draw the occlusive material into the catheter lumen; and
applying further aspiration to the outer catheter with an external aspiration source after removal of the inner catheter from the catheter lumen to further aspirate the occlusive material.