Patent ID: 6780170
Filing Date: 2004-08-24
Classification: A61M

Abstract:
A medical injector comprising:a plunger drive ram; a motor for moving said plunger drive ram; a first syringe including a syringe body and a first plunger slidably disposed within said syringe body; a syringe mounting for attachment of a second syringe, said syringe mounting positioning said second syringe relative to said plunger drive ram to permit said plunger drive ram to engage and move a second plunger into or out of said second syringe; a control circuit controlling said motor to move said plunger drive ram and said second plunger to inject fluid from said second syringe; at least one pressure transducer coupled to said control circuit; a condult having a first end operatively coupled to said first syringe and a second end coupled to said pressure transducer, whereby movement of said first plunger in said syringe body creates a pressure which is sensed by said pressure transducer and causes said control circuit to actuate the medical injector to inject fluid in response thereto; said control circuit responding the pressure sensed by said pressure transducer by moving said plunger drive ram at a rate related to the sensed pressure.