Patent ID: 8747392

Claim:
A medical handpiece comprising a handpiece outer housing, the handpiece outer housing enclosing an elongated motor assembly, the elongated motor assembly comprising a motor output shaft, the motor output shaft rotating about a motor output shaft axis, the handpiece outer housing also enclosing an internal fluid passage, the internal fluid passage extending generally parallel to the motor output shaft axis, the internal fluid passage also extending generally alongside the elongated motor assembly, a flow controller being mounted in the handpiece outer housing, the flow controller comprising an adjustable flow control valve, the adjustable flow control valve intersecting with the internal fluid passage of the handpiece outer housing, the motor output shaft of the elongated motor assembly being mechanically connected to a handpiece drive shaft, the handpiece drive shaft being rotatable about a handpiece drive shaft axis, the handpiece drive shaft axis being offset from the motor output shaft axis, the handpiece drive shaft comprising a drive shaft fluid passage, the drive shaft fluid passage being in fluid communication with the internal fluid passage of the handpiece outer housing, the handpiece further comprising a drive hub that is connected to the handpiece shaft, and a spring mounted between a portion of the drive hub and a portion of the handpiece drive shaft such that the drive hub is biased in a distal axial direction relative to the handpiece drive shaft.