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Medical apparatus

  • US 4,191,187 A
  • Filed: 03/08/1978
  • Issued: 03/04/1980
  • Est. Priority Date: 03/09/1977
  • Status: Expired due to Term
First Claim
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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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