US 12,089,867 B2
Telescoping atherectomy device
John To, Sunnyvale, CA (US); and Paul Escudero, Sunnyvale, CA (US)
Assigned to AVANTEC VASCULAR CORPORATION, Sunnyvale, CA (US)
Filed by AVANTEC VASCULAR CORPORATION, Sunnyvale, CA (US)
Filed on Mar. 11, 2022, as Appl. No. 17/692,522.
Application 17/692,522 is a continuation of application No. 17/518,294, filed on Nov. 3, 2021, granted, now 11,304,723.
Claims priority of provisional application 63/197,970, filed on Jun. 7, 2021.
Claims priority of provisional application 63/126,847, filed on Dec. 17, 2020.
Prior Publication US 2022/0192698 A1, Jun. 23, 2022
Int. Cl. A61B 17/3207 (2006.01); A61B 17/00 (2006.01)
CPC A61B 17/320725 (2013.01) [A61B 17/320758 (2013.01); A61B 2017/00292 (2013.01); A61B 2017/320733 (2013.01)] 17 Claims
OG exemplary drawing
 
11. An atherectomy device, comprising:
a distal end, a proximal end, a long axis, and a guidewire lumen passing through the device in the direction of the long axis;
a flexible sheath having an outer diameter and a sheath lumen;
a cutter having a proximal end, a distal end, and a body with a plurality of helical flutes, a point at the distal end having a plurality of cutting lips, a cutter lumen, and a cleared diameter;
a drive assembly having
a flexible driveshaft including an axis, a proximal end, a distal end, an outer surface, and a driveshaft lumen, the distal end of the flexible drive shaft having a fixed connection with the cutter, wherein the flexible drive shaft is rotatably translational within the lumen of the flexible sheath;
a positive displacement pump that begins pumping at the distal end of the drive shaft and adjacent to the helical flutes at the proximal end of the cutter; and,
a reversibly-expandable, lateral pushing member at the distal end of the flexible sheath, the lateral pushing member having a proximal end, a distal end, a collapsed state, and an expanded state, the proximal end having a connector assembly with the flexible sheath, and the distal end having a connector assembly with the cutter;
wherein,
the cleared diameter of the cutter is greater than the outer diameter of the flexible drive shaft;
the flexible drive shaft is longer than the flexible sheath to enable a reversible telescoping of the drive assembly from the lumen of the flexible sheath at the distal end of the flexible sheath;
the guidewire lumen includes the cutter lumen and the driveshaft lumen;
the connector assembly with the flexible sheath and the connector assembly with the cutter are each configured to receive an axial force (i) applied along the axis of the flexible drive shaft from the cutter to the flexible sheath and (ii) transferred through the lateral pushing member during the collapse and the expansion of the lateral pushing member with the reversible telescoping of the flexible drive shaft from the flexible sheath; and,
the connector assembly with the cutter is configured as a rotatably translatable connection to facilitate a rotation of the cutter and the flexible drive shaft without rotating the lateral pushing member during operation of the atherectomy device.