Current control for electrotransport drug delivery
First Claim
1. An electrotransport drug delivery system having a power source that is controlled by feedback circuitry that is isolated from a patient terminal, the system comprising:
- the power source;
the patient terminal comprising a first patient contact connected to the power source and a second patient contact connected to an isolation circuit; and
a sensing circuit configured to measure voltage, current or voltage and current at the isolation circuit, wherein the sensing circuit is configured to provide feedback controlling power at the first patient contact, wherein the second patient contact is connected to the sensing circuit only through the isolation circuit so that the second patient contact is electrically isolated from the sensing circuit.
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Accused Products
Abstract
Devices, systems and methods for controlling the application of current and/or voltage to deliver drug from patient contacts of an electrotransport drug delivery device by indirectly controlling and/or monitoring the applied current without directly measuring from the cathode of the patient terminal. In particular, described herein are electrotransport drug delivery systems including constant current delivery systems having a feedback current and/or voltage control module that is isolated from the patient contacts (e.g., anodes and cathodes). The feedback module may be isolated by a transistor from the patient contacts; feedback current and/or voltage control measurements may be performed at the transistor rather than at the patient contact (e.g., cathode).
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Citations
20 Claims
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1. An electrotransport drug delivery system having a power source that is controlled by feedback circuitry that is isolated from a patient terminal, the system comprising:
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the power source; the patient terminal comprising a first patient contact connected to the power source and a second patient contact connected to an isolation circuit; and a sensing circuit configured to measure voltage, current or voltage and current at the isolation circuit, wherein the sensing circuit is configured to provide feedback controlling power at the first patient contact, wherein the second patient contact is connected to the sensing circuit only through the isolation circuit so that the second patient contact is electrically isolated from the sensing circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An electrotransport drug delivery system having a power source that is controlled by feedback circuitry that is isolated from a patient terminal, the system comprising:
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the power source; the patient terminal comprising a first patient contact connected to the power source and a second patient contact connected to an isolation circuit; a feedback circuit configured to provide a control signal to the isolation circuit when the connection between the first patient contact and the second patient contact is closed; and a sensing circuit configured to measure voltage, current or current and voltage at the isolation circuit when the connection is closed, wherein the sensing circuit is configured to provide feedback controlling power at the first patient contact; wherein the second patient contact is connected to the feedback circuit and sensing circuit only though the isolation circuit. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification