US 12,239,796 B2
Elastomeric strain relief layering for catheters
David Cory Kirt, Minnetonka, MN (US); and Benjamin Mihelich, Minneapolis, MN (US)
Assigned to Boston Scientific Scimed, Inc., Maple Grove, MN (US)
Filed by BOSTON SCIENTIFIC SCIMED, INC., Maple Grove, MN (US)
Filed on Sep. 11, 2020, as Appl. No. 17/017,835.
Claims priority of provisional application 62/899,844, filed on Sep. 13, 2019.
Prior Publication US 2021/0077777 A1, Mar. 18, 2021
Int. Cl. A61M 25/00 (2006.01)
CPC A61M 25/0045 (2013.01) [A61M 2025/0059 (2013.01); A61M 2205/0216 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A medical device, comprising:
an elongate tubular shaft defining a lumen extending from a proximal portion to a distal portion, the elongate tubular shaft comprising:
an outer jacket forming an outer surface of the elongate tubular shaft;
a support member including at least one filament extending in a helical configuration along at least a portion of a length of the elongate tubular shaft;
a strain relief layer comprising a material that has a modulus of elasticity less than a modulus of elasticity of the outer jacket, the strain relief layer positioned at least between adjacent windings of the support member and over a radially outward surface of the at least one filament;
wherein the strain relief layer and the support member collectively form an inner surface of the elongate tubular shaft;
wherein the strain relief layer has a first thickness defining the inner surface of the elongate tubular shaft between the adjacent windings of the at least one filament and a second thickness on the radially outward surface of the at least one filament, wherein the first and second thicknesses are the same;
wherein the outer jacket has a first thickness where the outer jacket overlies the strain relief layer positioned over a radially outward surface of the at least one filament; and
wherein the outer jacket has a second thickness greater than the first thickness where the outer jacket overlies the strain relief layer positioned between adjacent windings of the at least one filament.