CPC A61B 17/320758 (2013.01) [A61B 17/320725 (2013.01); A61B 2017/00199 (2013.01); A61B 2017/00778 (2013.01); A61B 2017/320004 (2013.01); A61B 2017/320766 (2013.01)] | 19 Claims |
1. A rotational atherectomy system, comprising:
an actuator handle assembly comprising a housing and a carriage assembly that is movably coupled to the housing;
an elongate flexible drive shaft comprising a torque-transmitting coil, the drive shaft defining a longitudinal axis and a central drive shaft lumen extending along the longitudinal axis, the drive shaft rotatably coupled to the carriage assembly such that moving the carriage assembly in relation to the housing correspondingly moves the drive shaft in relation to the housing;
a set of eccentric abrasive elements fixed to a distal portion of the drive shaft and including at least a first, second, and third eccentric abrasive elements fixed to the drive shaft such that a center of mass of each eccentric abrasive element is offset from the longitudinal axis, the center of mass of the first eccentric abrasive element being offset from the longitudinal axis at a first radial angle, the center of mass of the second eccentric abrasive element being offset from the longitudinal axis at a second radial angle that differs from the first radial angle, the center of mass of the third eccentric abrasive element being offset from the longitudinal axis at a third radial angle that differs from the first radial angle and the second radial angle;
a sheath extending distally from a distal end of the actuator handle assembly and configured to receive a supply of flush fluid, the drive shaft being slidably disposed within a lumen defined by the sheath;
an electric motor coupled to the carriage assembly and configured to drive rotation of the drive shaft, wherein a motor switch button movable with the carriage assembly relative to the housing is depressible to activate the electric motor for driving rotation of the drive shaft at a rotational speed of 20,000-160,000 rpm to urge the set of eccentric abrasive elements to revolve in an orbital path; and
a guidewire detention clamp positioned adjacent to a guidewire access port at a proximal end of the actuator handle assembly opposite from the sheath extending distally from the distal end of the actuator handle assembly and coaxial with the drive shaft, the guide wire detention clamp being engageable with a guide wire advanced through the actuator handle assembly and the drive shaft so as to releasably clamp the guidewire in a stationary position during rotation of the drive shaft.
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