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Patient support device and method of operation

  • US 7,784,127 B2
  • Filed: 09/04/2008
  • Issued: 08/31/2010
  • Est. Priority Date: 09/04/2007
  • Status: Active Grant
First Claim
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1. A patient support device comprising:

  • a base;

    a table assembly supported by the base and configured to support a patient;

    an actuator assembly electrically coupled to and operable to control motion of the table assembly, the actuator assembly including a motor and a brake;

    a controller electrically coupled to the actuator assembly, the controller operable to generate a signal to activate the brake when power to the actuator assembly is interrupted; and

    an dynamic brake assembly electrically coupled to the actuator assembly and the controller, the dynamic brake assembly operable upon deactivation of the brake, the dynamic brake assembly including a passive dynamic load module electrically coupled to the motor to increase speed of the motor,a rectification module electrically coupled to the motor and operable to convert AC voltage to DC voltage when the AC voltage reaches a predetermined value,a controlled dynamic load module electrically coupled to the passive dynamic load module, anda switch operable to deactivate the brake and electrically couple the controlled dynamic load module and the actuator assembly to control a braking operation of the motor.

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