Patent ID: 6786885
Filing Date: 2004-09-07
Classification: A61M,Y10S

Abstract:
An electronic device for selectively injecting or withdrawing fluid from a patient's body comprising:a reservoir for injecting or collecting said fluid; a fluid delivery system having a first end coupled to said reservoir and a second end adapted to be inserted into the patient's body; an electrical drive mechanism arranged and constructed to apply a force within said reservoir in response to commands in one of a first direction in which fluid is injected from said reservoir through said fluid delivery system into the patient and a second direction in which fluid is withdrawn from the patient through said fluid delivery system; a sensor coupled to one of said reservoir, fluid delivery system and electrical drive mechanism for sensing an internal parameter indicative of a force generated by said drive mechanism and internal resistances within said reservoir and said fluid delivery system to said force; and a controller coupled to said sensor and said electrical drive mechanism, said controller including a calculator for calculating an entry/exit pressure at said second end as a function of said internal parameter, said controller generating said commands to control said entry/exit pressure.