An improved drive is provided for a syringe having a barrel and a plunger. The drive utilizes an electric motor which has an axial shaft that moves back and forth axially when the shaft is prevented from rotating. A syringe barrel holder is fixed relative to the electric motor housing and a plunger holder...http://www.google.com.au/patents/US4255096?utm_source=gb-gplus-sharePatent US4255096 - Drive for syringe pump
