Aspiration control system

Details Aspiration control system Aspiration control system

1992-02-12

1993-09-07

Lewis, Ralph

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604 30, 604 35, 604 67, A61M 3100

Patent

active

052424049

ABSTRACT:
An aspiration control system includes a motor and vacuum pump which are controlled by a system controller, in accordance with input commands to provide a precise, continuously variable vacuum or negative pressure within a vacuum chamber and surgical handpiece. The resulting vacuum is proportional to the control signal sent from the system controller to the motor. A transducer samples the vacuum output and produces a signal fed system controller. The signal is compared with a variable input signal set by a potentiometer or other signal source activated by the input commands so that the transducer signal tracks the voltage source signal. Therefore, the vacuum output of the vacuum pump and motor relates directly and predictably to the input commands. In one embodiment the motor is a brushless DC motor. The system may also include a pinch valve provided on a fluid aspiration conduit communicating between the surgical handpiece and vacuum chamber so that the fluid aspiration at the handpiece may be controlled independently from the negative pressure level created in the vacuum chamber.

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