Device and method of iontophoretic drug delivery
First Claim
1. An electrically powered iontophoretic agent delivery device including a donor electrode assembly, a counter electrode assembly and a source of electrical power adapted to be electrically connected to the donor electrode assembly and the counter electrode assembly, the donor electrode assembly comprising:
- an agent reservoir containing an agent and adapted to be placed in agent transmitting relation with a body surface, the agent being at least partially dissociated into agent ions and counter ions of opposite charge during use of the device;
a selectively permeable membrane containing a chelating agent, the selectively permeable membrane being positioned within the donor electrode assembly intermediate the donor electrode and the agent reservoir, the chelating agent being one which traps ions having a charge similar to the charge of the agent ions, the membrane being permeable to species having a charge similar to the charge of the counter ions and substantially less permeable to species having a charge similar to the charge of the agent ions.
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Accused Products
Abstract
A selectively permeable membrane (14) is positioned between the agent reservoir (15) and the electrode (11) of a donor electrode assembly (8) in an iontophoretic delivery device (10). Optionally, an electrolyte reservoir (13) is positioned intermediate the electrode (11) and the agent reservoir (15). In certain embodiments, the membrane (14) is permeable to species of less than a predetermined molecular weight and substantially less permeable to species of greater than the predetermined molecular weight. The agent is capable of dissociating into agent ions and counter ions. The size selectivity of the membrane (14), the molecular weight of the agent ions, the molecular weight of the counter ions, and optionally the molecular weight of the electrolyte ions are selected to (A) inhibit agent ions from interacting with the electrode (11), and from permeating into the electrolyte reservoir (13), where they might otherwise be degraded and (B) inhibit electrolyte ions, having a charge similar to that of the agent ions, from permeating into the agent reservoir (15) and competing with the agent ions for iontophoretic delivery into the patient.
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Citations
19 Claims
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1. An electrically powered iontophoretic agent delivery device including a donor electrode assembly, a counter electrode assembly and a source of electrical power adapted to be electrically connected to the donor electrode assembly and the counter electrode assembly, the donor electrode assembly comprising:
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an agent reservoir containing an agent and adapted to be placed in agent transmitting relation with a body surface, the agent being at least partially dissociated into agent ions and counter ions of opposite charge during use of the device; a selectively permeable membrane containing a chelating agent, the selectively permeable membrane being positioned within the donor electrode assembly intermediate the donor electrode and the agent reservoir, the chelating agent being one which traps ions having a charge similar to the charge of the agent ions, the membrane being permeable to species having a charge similar to the charge of the counter ions and substantially less permeable to species having a charge similar to the charge of the agent ions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification