Importance

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Abstract

Apparatus for driving a medical syringe plunger into its barrel at a variable controlled rate comprises an elongate support along which the syringe is secured, an electric motor, a transmission assembly drivably coupled with the motor to close the plunger into the barrel, a drive control for pulsing the motor to effect repeated constant incremental movements of the plunger through the transmission assembly, and a safety control operable to inhibit the drive control in response to continuous energization of the motor beyond a predetermined period. The safety control conveniently involves a capacitor charged by the motor pulses, and a latch activated by an 'excess' charge on the capacitor relative to a normal situation.

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First Claim