| 摘要 |
A system controls the flow of a drive fluid for driving a tool on a handpiece. The system comprises a drive fluid line communicating with the handpiece and a drive fluid control motor for controlling the flow of the drive fluid in the line. Control means is operatively associated with the fluid drive motor control, and responsive actuation means on the handpiece which is manually engaged by the finger of the user. Upon actuation, the control means controls the drive fluid control to provide initially a flow of the drive fluid such that the handpiece is powered at an initial level, the fluid motor then being continuously responsive for a time interval substantially coinciding with the operation of the actuation means by the finger of the user for altering the level of drive fluid flow to vary the power availabile in the handpiece. The level of flow when the finger releases the actuation means is then maintained until the actuation means is again actuated whereupon drive fluid flow is stopped.
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