Control membrane for electrotransport drug delivery
First Claim
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1. An iontophoretic agent delivery electrode for placement on a body surface and for delivering an agent through the body surface, comprising:
- a reservoir containing the agent to be delivered;
conductive means for electrically connecting the reservoir to a source of electrical power;
a means for maintaining the reservoir in agent transmitting relationship to said body surface; and
a membrane interposed between the agent reservoir and the body surface, the membrane permitting electrically-assisted flux (JEK) of the agent therethrough and substantially preventing passive flux (Jp) of the agent therethrough, the membrane exhibiting a (JEK +Jp)/Jp ratio of at least about 4, a voltage drop across the membrane of less than about 1 volt, and a Jp of less than about 100 μ
g/hr-cm2.
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Abstract
A membrane capable of controlling the rate at which an agent is released from an iontophoretic delivery device is provided. The membrane inhibits agent release from the delivery device when no electrical current is flowing and yet provides minimal impedance to electrically-assisted agent delivery. The membrane is useful both as a control membrane in an iontophoretic agent delivery device and as a test membrane for testing the performance characteristics of an iontophoretic agent delivery device in vitro.
184 Citations
53 Claims
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1. An iontophoretic agent delivery electrode for placement on a body surface and for delivering an agent through the body surface, comprising:
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a reservoir containing the agent to be delivered; conductive means for electrically connecting the reservoir to a source of electrical power; a means for maintaining the reservoir in agent transmitting relationship to said body surface; and a membrane interposed between the agent reservoir and the body surface, the membrane permitting electrically-assisted flux (JEK) of the agent therethrough and substantially preventing passive flux (Jp) of the agent therethrough, the membrane exhibiting a (JEK +Jp)/Jp ratio of at least about 4, a voltage drop across the membrane of less than about 1 volt, and a Jp of less than about 100 μ
g/hr-cm2. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 23)
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11. An iontophoretic agent delivery device for placement on a body surface comprising:
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a donor electrode including a reservoir containing the agent to be delivered, a counter electrode and a source of electrical power electrically connected to the donor and counter electrodes, the donor and counter electrodes adapted to be placed in spaced apart relationship on the body surface; means for maintaining the agent reservoir in agent transmitting relation with the body surface and for maintaining the counter electrode in electrolyte transmitting relation with the body surface; and a membrane interposed between the agent reservoir and the body surface, the membrane permitting electrically-assisted flux (JEK) of the agent therethrough and substantially preventing passive flux (Jp) of the agent therethrough, the membrane exhibiting a (JEK +Jp)/Jp ratio of at least about 4, a voltage drop across the membrane of less than about 1 volt, and a Jp of less than about 100 μ
g/hr-cm2. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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- 21. A membrane for controlling agent delivery rom an iontophoretic agent delivery device adapted to deliver the agent through an intact body surface, the device having a reservoir containing the agent to be delivered and being connectable to a source of electrical power for driving the agent from the reservoir and through the body surface, wherein the membrane is interposed between the agent reservoir and the body surface, the membrane permitting electrically-assisted flux (JEK) of the agent therethrough and substantially preventing passive flux (Jp) of the agent therethrough, the membrane exhibiting a (JEK +Jp)/Jp ratio of at least about 4, a voltage drop across the membrane of less than about 1 volt, and a Jp of less than about 100 μ
- 32. A membrane for testing performance characteristics of an iontophoretic agent delivery device adapted for delivering an agent through an intact body surface, the device having a reservoir containing the agent to be delivered and being connectable to a source of electrical power for driving the agent from the reservoir and through the body surface, the membrane permitting electrically-assisted flux (JEK) of the agent therethrough and substantially preventing passive flux (Jp) of the agent therethrough, the membrane exhibiting a (JEK +Jp)/Jp ratio of at least about 4, a voltage drop across the membrane of less than about 10 volts and a Jp of less than about 100 μ
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43. A method for testing performance characteristics of an iontophoretic agent delivery device adapted for delivering an agent through an intact body surface, the device having a reservoir containing the agent to be delivered and being connectable to a source of electrical power for driving the agent from the reservoir, comprising:
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placing the reservoir in agent transmitting relation with one surface of a membrane, the membrane having a second surface opposite the surface which is in agent transmitting relation with the reservoir, which second surface is in contact with an agent collecting medium, the membrane permitting electrically-assisted flux (JEK) of the agent therethrough and substantially preventing passive flux (Jp) of the agent therethrough, the membrane exhibiting a (JEK +Jp)/Jp ratio of at least about 4, a voltage drop across the membrane of less than about 10 volts, and a Jp of less than about 100 μ
g/hr-cm2 ; andconnecting the source of electrical power to the device and driving the agent through the membrane. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 52, 53)
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Specification