Current control for electrotransport drug delivery
First Claim
1. An electrotransport drug delivery system having a constant current supply, the system comprising:
- a power source;
a first patient contact connected to power source;
a second patient contact connected to a current control transistor; and
a sensing circuit configured to measure voltage at the transistor, 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 current control transistor 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
23 Claims
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1. An electrotransport drug delivery system having a constant current supply, the system comprising:
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a power source; a first patient contact connected to power source; a second patient contact connected to a current control transistor; and a sensing circuit configured to measure voltage at the transistor, 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 current control transistor so that the second patient contact is electrically isolated from the sensing circuit. - View Dependent Claims (2, 3, 4, 5)
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6. An electrotransport drug delivery system having a constant current supply, the system comprising:
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a power source; a first patient contact connected to the power source; a second patient contact connected to a transistor; a current control feedback circuit for providing a control signal to the transistor when the connection between the first patient contact and the second patient contact is closed;
wherein the transistor is connected to the second patient contact; anda sensing circuit configured to measure a voltage applied at the transistor 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 current control feedback circuit and sensing circuit only though the transistor. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for operating an electrotransport drug delivery system including a constant current supply, the method comprising:
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contacting a patient'"'"'s skin with an anode and cathode to form a connection between the anode and cathode; applying an anode voltage to the anode; providing a control signal to a transistor connected to the cathode; detecting a voltage at the transistor with a sensing circuit that is configured to control power at the anode, wherein the cathode is isolated from the voltage detection by the transistor; comparing the transistor voltage to a threshold voltage; and controlling the anode voltage applied to the anode based on the comparison between the transistor voltage and the threshold voltage. - View Dependent Claims (20, 21, 22, 23)
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Specification