Medical apparatus
First Claim
1. Syringe driving apparatus comprising an elongate support formed for securement therealong of the barrel of a syringe, an electric motor, a transmission assembly drivably coupled with said motor and engageable with the plunger of said syringe to move said plunger into said barrel, drive control means for repeatedly applying uniform electrical signals at an adjustable frequency to energise said motor by each such signal to produce a predetermined incremental movement of said plunger by said transmission system, and safety control means for inhibiting said drive control means in response to energisation of said motor thereby for a predetermined continuous period of time greater than the duration of each of said drive control signals during normal operation of the apparatus.
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Accused Products
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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Citations
10 Claims
- 1. Syringe driving apparatus comprising an elongate support formed for securement therealong of the barrel of a syringe, an electric motor, a transmission assembly drivably coupled with said motor and engageable with the plunger of said syringe to move said plunger into said barrel, drive control means for repeatedly applying uniform electrical signals at an adjustable frequency to energise said motor by each such signal to produce a predetermined incremental movement of said plunger by said transmission system, and safety control means for inhibiting said drive control means in response to energisation of said motor thereby for a predetermined continuous period of time greater than the duration of each of said drive control signals during normal operation of the apparatus.
Specification