Implantable medication infusion system
First Claim
1. A medical infusion system intermittently switchable at selected times between an open loop system without feedback and a closed loop system with feedback, said system comprising an implantable unit including means for controllably dispensing medication into a body, an external controller, and an extra-corporeal sensor;
- wherein said implantable unit comprises an implantable transceiver means for communicating with a similar external transceiver means in said external controller to provide a telemetry link between said controller and said implantable unit, a first reservoir means for holding medication liquid, a liquid dispensing device, a pump connected between said reservoir means and said liquid dispensing device, and a first electronic control circuit means connected to said implantable transceiver means and to said pump to operate said pump;
wherein said external controller comprises a second electronic control circuit means connected with said external transceiver means, a transducer means for reading said sensor, said transducer means having an output connected to said second electronic control circuit means, and a manually operable electric input device connected to said second electronic control circuit means;
wherein said pump is operable by said first electonic control circuit means to pump said medication liquid from said first reservoir means to said liquid-dispensing deive at a first predetermined rate independent of the output of said extra-corporeal sensor, and wherein said input device or said transducer means include means which selectively operable at intermittent times to respectively convey commands or output of said transducer representing the reading of said sensor to said second control circuit to instruct said first control circuit via said telemetry link to modify the operation of said pump.
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Abstract
An implantable medication delivery system comprising an implantable unit with a refillable reservoir, a catheter connected thereto, and a pumping mechanism activated by a microcomputer or microprocessor for pumping medication from the reservoir through the catheter into the body. The implantable medication unit receives information and control commands via a telemetry link from an external controller unit having a microprocessor. The external controller receives feedback in the form of intermittent sampling of blood using enzyme strips and a reflectance meter and/or additional sensor(s) which measure(s) physiological parameter(s) such as heart rate or blood pressure or temperature or skin resistivity. The feedback information is processed by the external unit in accordance with a mathematical model of the patient and the relevant parameters are transmitted to the implanted unit which adjusts its delivery profile according to a prescribed algorithm. The external unit can also detect an alarm condition and take appropriate steps, e.g. abort infusion.
1357 Citations
8 Claims
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1. A medical infusion system intermittently switchable at selected times between an open loop system without feedback and a closed loop system with feedback, said system comprising an implantable unit including means for controllably dispensing medication into a body, an external controller, and an extra-corporeal sensor;
- wherein said implantable unit comprises an implantable transceiver means for communicating with a similar external transceiver means in said external controller to provide a telemetry link between said controller and said implantable unit, a first reservoir means for holding medication liquid, a liquid dispensing device, a pump connected between said reservoir means and said liquid dispensing device, and a first electronic control circuit means connected to said implantable transceiver means and to said pump to operate said pump;
wherein said external controller comprises a second electronic control circuit means connected with said external transceiver means, a transducer means for reading said sensor, said transducer means having an output connected to said second electronic control circuit means, and a manually operable electric input device connected to said second electronic control circuit means;
wherein said pump is operable by said first electonic control circuit means to pump said medication liquid from said first reservoir means to said liquid-dispensing deive at a first predetermined rate independent of the output of said extra-corporeal sensor, and wherein said input device or said transducer means include means which selectively operable at intermittent times to respectively convey commands or output of said transducer representing the reading of said sensor to said second control circuit to instruct said first control circuit via said telemetry link to modify the operation of said pump. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- wherein said implantable unit comprises an implantable transceiver means for communicating with a similar external transceiver means in said external controller to provide a telemetry link between said controller and said implantable unit, a first reservoir means for holding medication liquid, a liquid dispensing device, a pump connected between said reservoir means and said liquid dispensing device, and a first electronic control circuit means connected to said implantable transceiver means and to said pump to operate said pump;
Specification