Electrotransport delivery device with voltage boosting circuit
First Claim
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1. A control circuit for use with an electrotransport delivery device, said delivery device including first and second electrodes for attaching the device to an animal body surface and for providing a therapeutic agent through the animal body surface, said control circuit comprising:
- a DC supply node for receiving a DC power input;
an inductor having first and second contacts, the first inductor contact being coupled to said DC supply node;
a diode having an anode coupled to the second inductor contact and a cathode coupled to said first electrode;
a switch having a control input, said switch being positioned between the anode and a circuit ground;
a filter capacitor coupled between the cathode and the circuit ground;
a sense resistor coupled between said second electrode and the circuit ground; and
a switch controller having a control output coupled to the control input of said switch and a sensor input coupled to a node between said second electrode and said sense resistor,wherein said switch controller toggles said switch to induce a working voltage at said first electrode, the induced working voltage driving an electrotransport current through the animal body surface and through said sense resistor, andwherein said switch controller compares a voltage arising at the sensor input with a reference voltage and boosts the working voltage to a value sufficient to make the voltage arising at the sensor input substantially equal to the reference voltage.
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Abstract
An electrotransport device (10) for delivering therapeutic agents includes an adjustable voltage boost multiple controller (100, 200) for boosting the voltage from a power source (102, 202) to a working voltage Vw having a value just sufficient to provide the desired therapeutic current level II through the electrodes (108, 112), at least one of which contains the therapeutic agent to be delivered.
122 Citations
9 Claims
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1. A control circuit for use with an electrotransport delivery device, said delivery device including first and second electrodes for attaching the device to an animal body surface and for providing a therapeutic agent through the animal body surface, said control circuit comprising:
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a DC supply node for receiving a DC power input; an inductor having first and second contacts, the first inductor contact being coupled to said DC supply node; a diode having an anode coupled to the second inductor contact and a cathode coupled to said first electrode; a switch having a control input, said switch being positioned between the anode and a circuit ground; a filter capacitor coupled between the cathode and the circuit ground; a sense resistor coupled between said second electrode and the circuit ground; and a switch controller having a control output coupled to the control input of said switch and a sensor input coupled to a node between said second electrode and said sense resistor, wherein said switch controller toggles said switch to induce a working voltage at said first electrode, the induced working voltage driving an electrotransport current through the animal body surface and through said sense resistor, and wherein said switch controller compares a voltage arising at the sensor input with a reference voltage and boosts the working voltage to a value sufficient to make the voltage arising at the sensor input substantially equal to the reference voltage. - View Dependent Claims (2, 3, 4)
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5. A method of driving an electrotransport current through an animal body surface, comprising the steps of:
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applying a working voltage across a series combination of the animal body surface and a sense resistor to drive the electrotransport current through the animal body surface and through the sense resistor; comparing a voltage arising across the sense resistor to a reference voltage; and boosting the working voltage to a level sufficient to make the voltage arising across the sense resistor substantially equal to the reference voltage. - View Dependent Claims (6, 7, 8, 9)
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Specification