US 11,752,313 B2
Balloon catheter including a drug delivery sheath
Shyam Nagasrinivasa, Santa Rosa, CA (US); and Claudio Silvestro, Healdsburg, CA (US)
Assigned to Medtronic Vascular, Inc., Santa Rosa, CA (US)
Filed by Medtronic Vascular, Inc., Santa Rosa, CA (US)
Filed on Feb. 4, 2021, as Appl. No. 17/167,285.
Application 17/167,285 is a division of application No. 15/137,934, filed on Apr. 25, 2016, granted, now 10,940,294.
Prior Publication US 2021/0154445 A1, May 27, 2021
Int. Cl. A61M 25/10 (2013.01)
CPC A61M 25/104 (2013.01) [A61M 25/10 (2013.01); A61M 2025/105 (2013.01); A61M 2025/1031 (2013.01); A61M 2025/1081 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of delivering a therapeutic agent to a treatment site disposed on an inner surface of a vessel, comprising:
advancing an expandable balloon into the vessel with an elongated catheter shaft comprising a proximal end and a distal end, wherein the expandable balloon is connected to the elongated catheter shaft adjacent the distal end of the elongated catheter shaft;
inflating the expandable balloon such that an outer surface of the expandable balloon contacts the treatment site;
deflating the expandable balloon;
advancing a sheath into the vessel over the elongated catheter shaft such that a distal end of the sheath is adjacent the expandable balloon, wherein the sheath comprises an inner surface that defines a lumen and a therapeutic agent disposed within the lumen of the sheath;
positioning at least a portion of the expandable balloon within the sheath such that the outer surface of the expandable balloon contacts the therapeutic agent within the lumen of the sheath, thereby transferring at least a portion of the therapeutic agent from the lumen of the sheath to the outer surface of the expandable balloon;
advancing the expandable balloon beyond the distal end of the sheath; and
re-inflating the expandable balloon such that the outer surface of the expandable balloon contacts the treatment site.