Medical instrument with programmable torque control

Details Medical instrument with programmable torque control Medical instrument with programmable torque control

1995-01-05

1996-08-06

Martin, David S.

Electricity: motive power systems

Constant motor current, load and/or torque control

318799, 318806, H02P 700

Patent

active

055436951

ABSTRACT:
A powered medical instrument includes a manually operable foot switch coupled to a motor control unit which in turn is coupled to an autoclavable handpiece containing a brushless sensorless electric motor driving a tool. The motor control arrangement includes a control panel through which a user can select a maximum torque value for the motor, and includes a torque limit circuit which limits the motor torque to the torque limit value selected by the user. The control panel also provides a digital display of actual motor speed and allows the user to digitally specify a maximum motor speed. The output of the foot switch is adjusted by a transfer function and then used to control motor speed, and the transfer function is adjusted as necessary to precisely conform the actual motor speed and thus the displayed speed to the selected maximum speed. The feedback path for the actual motor speed is entirely digital, so that a highly accurate value of actual speed is available for display and for adjustment of the transfer function.

REFERENCES:
patent: Re30356 (1980-08-01), Berman et al.
patent: 4486176 (1984-12-01), Tardieu et al.
patent: 4568283 (1986-02-01), Hotta et al.
patent: 4760317 (1988-07-01), Hetzel et al.
patent: 4870334 (1989-09-01), Iwasha et al.
patent: 5469215 (1995-11-01), Nashiki
Yuji Akiyama, Tadashi Hitomi Akira Tsukihashi & Sosuke Sunago, "Sensorless Brushless DC Motor Shrinks Stereo Player Size", Power/Conversion & Intelligent Motion, Jan., 1991, cover and pp. 28-32.

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