Patent ID: 11957377
Assignee: CARDIOVASCULAR SYSTEMS, INC.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A method of improving control of the length and diameter of rotational drive shafts during high-speed intravascular procedures comprising:
providing a drive shaft comprising a metallic coil comprising one or more wound wire filars, wherein the metallic coil defines a lumen therethrough;
providing an outer polymer layer surrounding the one or more wound wire filars of the metallic coil, wherein at least part of the outer polymer layer fills and closes the gaps between the adjacent windings of the one or more wound wire filars, whereby fluid cannot enter or exit the lumen defined by the metallic coil, and wherein the outer polymer layer is connected with the one or more wound filars of the metallic coil such that the outer polymer layer and the metallic coil rotate together;
constraining, with the outer polymer layer, axial elongation and axial compression of the one or more wound wire filars during high-speed rotation of the rotational drive shaft; and
thereby controlling the axial length and related diameter of the metallic coil of the rotational drive shaft during high-speed rotation.