Transdermal drug delivery method and system
First Claim
1. A method for transdermal administration of at least one active substance to a porous surface comprising:
- (a) storing at least one active substance in at least one substance reservoir;
(b) storing at least one solvent, operable to solubilize or disperse the at least one active substance, in at least one solvent reservoir;
(c) dispensing a first portion of the at least one active substance from the at least one substance reservoir and dispensing a second portion of the at least one solvent from the at least one solvent reservoir to at least one administration reservoir forming a solution or dispersion of the at least one active substance;
(d) transferring the solution or dispersion of the at least one active substance from the at least one administration reservoir to at least one interface, wherein the interface is interposed between the administration reservoir and the porous surface;
(e) removing the at least one solvent from the at least one administration reservoir by at least one solvent removal element; and
delivering the solution or dispersion of the at least one active substance from the at least one interface to the porous surface.
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Accused Products
Abstract
The invention concerns a transdermal delivery system for controlled dispensing of an active substance to and through a porous surface. A certain amount of fluid comprising at least one active substance and at least one solvent is dispensed into an administration reservoir. In the administration reservoir the at least one solvent is separated from the administration reservoir by a solvent recovery means such that the active substance achieves a certain level on an interface device which is permeable for the one active substance. Thereby the active substance is absorbable via diffusion from the interface device by a porous surface to be treated.
54 Citations
21 Claims
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1. A method for transdermal administration of at least one active substance to a porous surface comprising:
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(a) storing at least one active substance in at least one substance reservoir; (b) storing at least one solvent, operable to solubilize or disperse the at least one active substance, in at least one solvent reservoir; (c) dispensing a first portion of the at least one active substance from the at least one substance reservoir and dispensing a second portion of the at least one solvent from the at least one solvent reservoir to at least one administration reservoir forming a solution or dispersion of the at least one active substance; (d) transferring the solution or dispersion of the at least one active substance from the at least one administration reservoir to at least one interface, wherein the interface is interposed between the administration reservoir and the porous surface; (e) removing the at least one solvent from the at least one administration reservoir by at least one solvent removal element; and delivering the solution or dispersion of the at least one active substance from the at least one interface to the porous surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for achieving a desired concentration of at least one active substance in a porous surface comprising contacting the porous surface with at least one interface operable to transfer at least one active substance from at least one administration reservoir to the porous surface, wherein the contacting comprises:
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(a) delivering a first portion of the at least one active substance which is solubilized or dispersed in a solvent from the at least one administration reservoir to the at least one interface; and (b) removing a second portion of the solvent from the at least one administration reservoir by a solvent removal element which functions to control the concentration of the at least one active substance in the porous surface.
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Specification