US 12,290,279 B2
Hybrid atherectomy devices
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 Jun. 7, 2022, as Appl. No. 17/833,967.
Claims priority of provisional application 63/197,970, filed on Jun. 7, 2021.
Prior Publication US 2022/0387071 A1, Dec. 8, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. A61B 17/3207 (2006.01); A61B 17/00 (2006.01); A61B 17/22 (2006.01)
CPC A61B 17/320758 (2013.01) [A61B 2017/00685 (2013.01); A61B 2017/22094 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An atherectomy device, comprising:
a cutter having a cleared diameter, the cutter including
a proximal end, a distal end, and a longitudinal axis;
a cutting length defined by the distance from the proximal end to the distal end along the longitudinal axis;
a radius at the distal end, the radius having an inner inflection point and an outer inflection point;
a first primary cutting edge and a second primary cutting edge, the first primary cutting edge and the second primary cutting edge extending helically from the distal end to the proximal end and along the radius;
a first helical flute and a second helical flute, each of the first helical flute and the second helical flute having a helix angle and forming a helical channel that is open at the distal end and the proximal end;
a cutting diameter, the cutting diameter being the maximum distance between the first primary cutting edge and the second primary cutting edge measured normal to the longitudinal axis;
a core having a core diameter, a distal end, and a proximal end;
wherein the distal end of the core is configured with a first plurality of secondary facets that form a first secondary cutting edge at the distal end of the first helical flute; and,
a second plurality of secondary facets that form a second secondary cutting edge at the distal end of the second helical flute;
wherein, the cutter
has a lumen configured for passage of a guidewire;
effectively cuts both soft and hard plaque in blood vessels; and
has a cleared diameter;
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; and,
a drive assembly having
a flexible driveshaft including an axis, a proximal end, a distal end, an outer surface, an outer diameter 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 with the lumen of the flexible sheath; and,
a positive displacement pump that begins pumping at the distal end of the flexible drive shaft and adjacent to the first helical flute and the second helical flute at the proximal end of 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;
and,
the guidewire lumen includes the cutter lumen and the driveshaft lumen.