Hypodermic syringe operating means

• US 3,155,090 A
• Filed: 01/10/1962
• Issued: 11/03/1964
• Est. Priority Date: 01/10/1962
• Status: Expired due to Term

• Current Assignee: John W. Holter
• Original Assignee: John W. Holter
• Inventors: Holter, John W.
• Application Number:
  US04/165,368
• Time in Patent Office: 1,028 Days
• US Class Current: 600/432
• CPC Class Codes: A61M 5/007 for contrast media
• CPC Class Codes: A61M 5/1456 with a replaceable reservoir comprising a piston rod to be moved into the reservoir, e.g. the piston rod is part of the removable reservoir
• CPC Class Codes: Y10S 128/01 Motorized syringe

Claims

1. APPARATUS FOR AUTOMATICALLY INJECTING A LIQUID INTO A FLUID SYSTEM AT A CONTROLLED PRESSURE COMPRISING A SYRINGE CONTAINING SAID LIQUID AND INCLUDING A PISTON FOR DISCHARGING SAID LIQUID THEREFROM, AN INJECTOR CONNECTED TO SAID SYRINGE FOR INJECTING SAID LIQUID INTO SAID SYSTEM, A DRIVE MOTOR OPERATIVELY CONNECTED TO ADVANCE SAID PISTON SO AS TO DISCHARGE LIQUID FROM SAID SYRINGE, AND MEANS RESPONSIVE TO PRESSURE VARIATIONS OF SAID DISCHARGED LIQUID ABOVE AND BELOW A PREDETERMINED PRESSURE FOR AUTOMATICALLY INTERRUPTING AND RESUMING THE ADVANCE OF SAID PISTON WHEREBY SAID LIQUID IS INJECTED AT A CONTROLLED PRESSURE.