Pressure/force computer controlled drug delivery system with automated charging
First Claim
1. An electronic device for selectively injecting or withdrawing fluid from a patient'"'"'s body comprising:
- a reservoir for injecting or collecting said fluid;
a source of therapeutic fluid;
a fluid delivery system having a first end coupled to a said reservoir and a second end adapted to be inserted into the patient'"'"'s body;
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 for said drive mechanism to control said entry/exit pressure;
wherein said pump in said charging mode is advanced to an empty position and then the piston is retrieved to a full position with the reservoir connected to the source of therapeutic fluid thereby causing said therapeutic fluid to fill said container.
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Accused Products
Abstract
An automatic injection device includes a drive mechanism and a sensor used to determine an internal characteristic such as a force or internal pressure generated during an injection process. This characteristic is then used as a control parameter by a microprocessor or controller which generates corresponding commands to the drive mechanism. In a particularly advantageous embodiment, the characteristic is used to calculate an exit pressure at which fluid ejected by the device through an elongated tube. The drive mechanism is then operated in such a manner that the exit pressure is maintained at a predetermined level to insure that a patient does not suffer pain and/or tissue damage.
86 Citations
9 Claims
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1. An electronic device for selectively injecting or withdrawing fluid from a patient'"'"'s body comprising:
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a reservoir for injecting or collecting said fluid;
a source of therapeutic fluid;
a fluid delivery system having a first end coupled to a said reservoir and a second end adapted to be inserted into the patient'"'"'s body;
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 for said drive mechanism to control said entry/exit pressure;
wherein said pump in said charging mode is advanced to an empty position and then the piston is retrieved to a full position with the reservoir connected to the source of therapeutic fluid thereby causing said therapeutic fluid to fill said container. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification