US 12,220,146 B2
Atherectomy devices and methods
Paul Joseph Robinson, Mahtomedi, MN (US); Cassandra Ann Piippo Svendsen, Blaine, MN (US); Albert Selden Benjamin, St. Paul, MN (US); and Charles Anthony Plowe, Blaine, MN (US)
Assigned to Cardio Flow, Inc., St. Paul, MN (US)
Filed by Cardio Flow, Inc., St. Paul, MN (US)
Filed on Sep. 27, 2022, as Appl. No. 17/954,038.
Application 17/954,038 is a continuation of application No. 16/672,900, filed on Nov. 4, 2019, granted, now 11,457,946.
Application 16/672,900 is a continuation of application No. 16/146,809, filed on Sep. 28, 2018, granted, now 10,463,390, issued on Nov. 5, 2019.
Application 16/146,809 is a continuation of application No. 15/988,160, filed on May 24, 2018.
Prior Publication US 2023/0116977 A1, Apr. 20, 2023
Int. Cl. A61B 17/3207 (2006.01); A61B 17/32 (2006.01)
CPC A61B 17/320758 (2013.01) [A61B 17/320725 (2013.01); A61B 2017/320004 (2013.01); A61B 2017/320733 (2013.01); A61B 2017/320741 (2013.01); A61B 2017/320766 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for performing rotational atherectomy, the method comprising:
delivering a torque-transmitting coil of a rotational atherectomy system into a blood vessel, wherein the rotational atherectomy system comprises:
a guidewire delivered to the blood vessel such that the torque-transmitting coil is advanced over the guidewire;
the torque-transmitting coil defining a central lumen along a longitudinal axis and comprising a single filar helically wound around the longitudinal axis in a first spiral direction to provide an exterior coil diameter;
one or more 2 mm-diameter abrasive elements fixedly mounted to the single filar of the torque-transmitting coil along a distal portion of the torque-transmitting coil such that each 2 mm-diameter abrasive element has a center of mass offset from the longitudinal axis;
a concentric metallic tip mounted to a distal-most end of the torque-transmitting coil and having an annular body that extends distally from the torque-transmitting coil to an exterior tip diameter smaller than the exterior coil diameter of the torque-transmitting coil, wherein the concentric metallic tip has an exterior surface that is smoother than the one or more 2 mm-diameter abrasive elements and has a central opening to receive the guidewire; and
an atherectomy handle assembly comprising: a handle body having a front end and rear end, a sheath extending from a front end of the handle body such that the torque-transmitting coil is slidably disposed within the sheath, a carriage assembly slidably translatable in a longitudinal direction relative to the handle body so as to translate the torque-transmitting coil relative to the sheath, wherein the carriage assembly includes an electric motor carried by the carriage assembly to drive rotation of the torque-transmitting coil in a rotational direction that is the same as the first spiral direction and a button actuator carried by the carriage assembly to activate the electric motor, a guidewire access port located at the rear end of the handle body and axially aligned with the sheath at the front end of the handle body, and a guidewire lock actuator located at the rear end of the handle body and being movable relative to the handle body to releasably lock the guidewire in a selected position relative to the handle body; and
while the guidewire is releasable locked by the guidewire lock actuator and is positioned entirely through the atherectomy handle assembly with a distal end of the guidewire extending distally of the concentric metallic tip and a proximal end of the guidewire extending proximally from the guidewire access port, simultaneously translating and rotating the torque-transmitting coil inside the blood vessel relative to the guidewire so that the one or more 2 mm-diameter abrasive elements orbit in the rotational direction that is the same as the first spiral direction.