Drug infusion device with tissue identification using pressure sensing
First Claim
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1. An apparatus comprising:
- a housing;
a pumping mechanism in said housing;
a fluid container coupled to said housing and activated by said pumping mechanism to pump a drug fluid, said drug fluid exiting at a dynamic exit fluid pressure, said fluid container including injection means for administering the drug fluid at an exit fluid pressure to a patient tissue type for receiving the drug fluid;
a sensor arranged for determining said exit fluid pressure based on a measured parameter of at least one of said pumping mechanism and said fluid container; and
a controller for receiving said dynamic exit fluid pressure and having at least one memory data bank and at least one microprocessor, said memory data bank storing a plurality of known interstitial fluid pressures corresponding to different patient tissue types, the memory data bank also storing the measured parameter, said microprocessor generating an output based on the measured parameter and the patient tissue type for receiving said drug fluid and for correlating said exit fluid pressure to one of said known interstitial fluid pressures.
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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 to determine the exit pressure of the fluid expelled by the device. This exit pressure is then used to identify the kind of tissue in which the injection is being introduced.
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Citations
17 Claims
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1. An apparatus comprising:
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a housing; a pumping mechanism in said housing; a fluid container coupled to said housing and activated by said pumping mechanism to pump a drug fluid, said drug fluid exiting at a dynamic exit fluid pressure, said fluid container including injection means for administering the drug fluid at an exit fluid pressure to a patient tissue type for receiving the drug fluid; a sensor arranged for determining said exit fluid pressure based on a measured parameter of at least one of said pumping mechanism and said fluid container; and a controller for receiving said dynamic exit fluid pressure and having at least one memory data bank and at least one microprocessor, said memory data bank storing a plurality of known interstitial fluid pressures corresponding to different patient tissue types, the memory data bank also storing the measured parameter, said microprocessor generating an output based on the measured parameter and the patient tissue type for receiving said drug fluid and for correlating said exit fluid pressure to one of said known interstitial fluid pressures. - View Dependent Claims (2, 3)
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4. An apparatus comprising:
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a pumping mechanism; a fluid container coupled to said pumping mechanism to pump a drug fluid, said fluid exiting at a dynamic exit fluid pressure into a selected biological tissue type; a sensor arranged to enable sensing and identification of specific biological tissue types based on the exit fluid pressures; and a controller for receiving said dynamic exit fluid pressure and having at least one memory data bank and at least one microprocessor, said memory data bank storing a plurality of known interstitial fluid pressures corresponding to different biological tissue types, the memory data bank also storing measured parameters of at least one of said pumping mechanism and said fluid container, said microprocessor generating an output based on the measured parameter and the biological tissue type and for correlating said exit fluid pressure to one of said known interstitial fluid pressures. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification