Pressure/force computer controlled drug delivery system with exit pressure control
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 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from said reservoir through said fluid delivery system into the patient and a second direction in which fluid is withdrawn from the patient through said fluid delivery system;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.
1 Assignment
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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.
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Citations
24 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 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. - View Dependent Claims (2, 3, 4, 5)
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6. An injection device for injection of fluids into body tissues comprising:
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a fluid reservoir holding a fluid to be injected;
a fluid delivery section having a first end coupled to said fluid reservoir and a second end adapted to be inserted into the body tissues;
a drive mechanism adapted to generate an internal pressure within said fluid reservoir in response to commands to force said fluid to flow through said fluid delivery section and out through said second end, said fluid having an exit pressure at said second end;
an input element for inputting physical characteristics of at least one of said fluid, said fluid reservoir and said fluid delivery section;
a sensor that senses an internal parameter indicative of said internal pressure; and
a controller receiving said physical characteristics and said internal parameter, said controller including a calculator to determine said exit pressure based on said physical characteristics and said internal parameter, said controller generating said commands to control said exit pressure.
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7. 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 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;
a controller coupled to said electrical drive mechanism, said controller generating said commands to control the operation of the electrical drive mechanism, and including a calculator calculating an entry/exit pressure at said second end as a function of said internal parameter; and
a speaker generating an audible output indicative of the current value of said entry/exit pressure. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An electronic injection device for selectively injecting a fluid comprising:
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a fluid source adapted to hold said fluid;
a fluid ejection section having a first end coupled to said fluid source and a second end adapted to eject said fluid; a drive mechanism coupled to said fluid ejection section and arranged and constructed to cause said fluid to be ejected in response to a command signal;
a sensor coupled to said fluid ejection section for sensing an internal pressure of said fluid within said fluid ejection section;
a controller coupled to said drive mechanism, said controller being adapted to generate commands to operate drive mechanism; and
a speaker generating an audible output indicative of the current value of said internal parameter.
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20. A method injecting fluids into a body tissue comprising:
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providing a reservoir filled with a fluid;
forcing said fluid from said reservoir through a fluid delivery system into the body tissue, said fluid having an exit pressure at an interface between said fluid delivery system and the body tissue;
automatically measuring said exit pressure;
monitoring said exit pressure; and
automatically controlling the flow of said fluid to control said exit pressure. - View Dependent Claims (21, 22, 23, 24)
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Specification