US 11,980,385 B2
Drive shaft design, conditioning and stabilization methods for rotational medical devices
Benjamin D. Haselman, St. Paul, MN (US); Tristan A. Van de Moortele, Minneapolis, MN (US); and Matthew W. Hanson, St. Louis Park, MN (US)
Assigned to Cardiovascular Systems, Inc., St. Paul, MN (US)
Filed by Cardiovascular Systems, Inc., St. Paul, MN (US)
Filed on Feb. 10, 2022, as Appl. No. 17/650,565.
Claims priority of provisional application 63/148,425, filed on Feb. 11, 2021.
Prior Publication US 2022/0249122 A1, Aug. 11, 2022
Int. Cl. A61B 17/3207 (2006.01); A61M 60/804 (2021.01); A61M 60/818 (2021.01)
CPC A61B 17/320758 (2013.01) [A61M 60/804 (2021.01); A61M 60/818 (2021.01); A61B 2017/320775 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A hemodynamic support device comprising: an electric motor having a rotational motor shaft and motor manifold at least partially surrounding the rotational motor shaft, the electric motor configured to rotate the rotational motor shaft;
a blood pump comprising an impeller, an impeller shaft and impeller housing at least partially surrounding the impeller and part of the impeller shaft; an elongated flexible drive shaft formed of a plurality of wire filars and having an undeformed length, a proximal end and a distal end, the proximal end of the drive shaft rotationally connected to the rotational motor shaft and the distal end rotationally connected to the impeller shaft;
wherein the elongated flexible drive shaft is deformed to a stretched configuration with a length greater than the undeformed length between the rotational motor shaft and impeller shaft to create a biasing build tension force between the impeller and the electric motor shaft, wherein the impeller resists movement in a distal axial direction within the impeller housing as a result of the biasing build tension force.