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US 6,208,891 B1Granted
Disabling circuit for an iontophoretic system
AssigneeDrug Delivery Technologies, Inc.
InventorRonald J. Flower
Life of this patent
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Abstract
An apparatus and a corresponding method for the iontophoretic delivery of drugs that operates only when the supply voltage is higher than a predetermined threshold is provided. The apparatus includes a current control circuit for controlling the current in an iontophoretic patch, and a supply voltage detection circuit. When a low supply voltage is detected, the current control circuit is disabled, which stops the iontophoretic current, thereby stopping the delivery of drugs.
Claims13
A fail-safe iontophoretic apparatus, comprising:
- a voltage detection circuit having an output that is asserted when a supply voltage falls below a predetermined level;
- and
- a current control circuit having an output transistor through which an iontophoretic output current passes, the output transistor having a control input,
- wherein the voltage detection circuit output, when asserted, drives the control input of the output transistor to a level that prevents the output transistor from turning on, stopping the iontophoretic output current.
1 more element
Dependencies are inferred from the claim text.