US 11,724,074 B2
Methods and devices for paranasal sinus drug delivery
Peter T. Keith, Lanesboro, MN (US); and Reuben C. Setliff, III, Sioux Falls, SD (US)
Assigned to Entellus Medical, Inc., Maple Grove, MN (US)
Filed by Entellus Medical, Inc., Maple Grove, MN (US)
Filed on Oct. 27, 2020, as Appl. No. 17/81,548.
Application 17/081,548 is a continuation of application No. 16/019,356, filed on Jun. 26, 2018, granted, now 10,842,972.
Application 16/019,356 is a continuation of application No. 15/140,474, filed on Apr. 28, 2016, granted, now 10,029,069, issued on Jul. 24, 2018.
Application 15/140,474 is a continuation of application No. 12/766,586, filed on Apr. 23, 2010, granted, now 9,333,327, issued on May 10, 2016.
Claims priority of provisional application 61/172,426, filed on Apr. 24, 2009.
Prior Publication US 2021/0106797 A1, Apr. 15, 2021
Int. Cl. A61M 25/10 (2013.01); A61B 17/24 (2006.01); A61M 27/00 (2006.01); A61M 25/00 (2006.01); A61F 2/18 (2006.01)
CPC A61M 25/1002 (2013.01) [A61B 17/24 (2013.01); A61M 25/0012 (2013.01); A61M 27/002 (2013.01); A61F 2/186 (2013.01); A61F 2250/0059 (2013.01); A61F 2250/0068 (2013.01); A61M 2025/1004 (2013.01); A61M 2025/1054 (2013.01); A61M 2210/0681 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A drug delivery system, comprising:
an elongated shaft comprising an outer tube and an inner tube, wherein the inner tube is disposed in a first lumen of the outer tube, wherein the inner tube defines a second lumen;
a fluid reservoir in fluid communication with the inner tube via a flow port in the inner tube, wherein the fluid reservoir is further in fluid communication with the first lumen of the outer tube via a gap between the inner tube and the outer tube; and
a dispensing structure on the outer tube, wherein the dispensing structure is configured to dispense a fluid to a drainage pathway of a frontal sinus cavity; and
an anchoring structure configured to engage the frontal sinus cavity such that the dispensing structure is located in the drainage pathway of the frontal sinus cavity,
wherein the inner tube, the fluid reservoir, the outer tube, and the dispensing structure define a fluid pathway such that the fluid flows (i) distally along the second lumen of the inner tube, (ii) from the second lumen of the inner tube to the fluid reservoir via the flow port, (iii) from the fluid reservoir to the first lumen of the outer tube via the gap between the inner tube and the outer tube, (iv) proximally along the first lumen of the outer tube to the dispensing structure, and (v) through the dispensing structure to the drainage pathway of the frontal sinus cavity.