Electrode Assembly for Iontophoresis Having Shape-Memory Separator and Iontophoresis Device Using the Same

• US 20090299265A1
• Filed: 10/02/2006
• Published: 12/03/2009
• Est. Priority Date: 09/30/2005
• Status: Abandoned Application

• Current Assignee: TTI Ellebeau, Inc. (Ease Asset Management Ltd.)
• Original Assignee: TTI Ellebeau, Inc. (Ease Asset Management Ltd.)
• Inventors: Tanioka, Akihiko, Nakayama, Mizuo, Matsumura, Akihiko, Matsumura, Takehiko, Akiyama, Hidero
• Application Number:
  US11/992,672
• Publication Number:
  US 20090299265A1
• Time in Patent Office: Days
• US Class Current: 604/20
• CPC Class Codes: A61N 1/044 Shape of the electrode
• CPC Class Codes: A61N 1/0444 Membrane
• CPC Class Codes: A61N 1/0448 Drug reservoir

Abstract

An electrode assembly for iontophoresis including an electrode coupled to an electric power source device having a same polarity as that of the ionic drug in the electrode assembly, an electrolyte solution holding portion holding an electrolyte solution by being impregnated with the electrolyte solution, the electrolyte solution holding portion being placed adjacent to the electrode, a first ion exchange membrane operable to substantially pass ions having a polarity that is same as a polarity of the ionic drug and substantially block ions having a polarity that is opposite the polarity of the ionic drug, the first ion exchange membrane being placed adjacent to the electrolyte solution holding portion, a drug solution holding portion holding the ionic drug by being impregnated with the ionic drug, the drug solution holding portion being placed adjacent to the first ion exchange membrane, a second ion exchange membrane operable to substantially pass ions having a polarity that is opposite the polarity of the ionic drug and substantially block ions having a polarity that is the same as the polarity of the ionic drug, the second ion exchange membrane being placed adjacent to the drug solution holding portion, and a shape-memory separator capable of being transformed between a first and a second configuration to respectively allow passage of a substance and blocking of the substance, the shape-memory separator placed adjacent to at least one surface of the first ion exchange membrane.

Claims

1. An electrode assembly for iontophoresis holding an ionic drug, the electrode assembly comprising:

an electrode coupled to an electric power source device having a same polarity as that of the ionic drug in the electrode assembly;

an electrolyte solution holding portion holding an electrolyte solution by being impregnated with the electrolyte solution, the electrolyte solution holding portion being placed adjacent to the electrode;

a first ion exchange membrane operable to substantially pass ions having a polarity that is same as a polarity of the ionic drug and substantially block ions having a polarity that is opposite the polarity of the ionic drug, the first ion exchange membrane being placed adjacent to the electrolyte solution holding portion;

a drug solution holding portion holding the ionic drug by being impregnated with the ionic drug, the drug solution holding portion being placed adjacent to the first ion exchange membrane;

a second ion exchange membrane operable to substantially pass ions having a polarity that is opposite the polarity of the ionic drug and substantially block ions having a polarity that is the same as the polarity of the ionic drug, the second ion exchange membrane being placed adjacent to the drug solution holding portion; and

a shape-memory separator capable of being transformed between a first and a second configuration to respectively allow passage of a substance and blocking of the substance, the shape-memory separator placed adjacent to at least one surface of the first ion exchange membrane.

2. The electrode assembly for iontophoresis according to claim 1, wherein

the shape-memory separator takes a form of at least one of a membrane of a shape-memory resin capable of being porous and a porous membrane including the shape-memory resin,

the shape-memory separator closes a pore to block movement of the substance prior to use, and transforms to being porous in response to at least one of being heated to a defined temperature range and being applied with a desired voltage to allow the substance to pass therethrough.

3. The electrode assembly for iontophoresis according to claim 2, wherein the shape-memory separator blocks the passage of the substance in response to being at a temperature lower than 30°

C. and transforms into a porous state to allow the substance to pass therethrough in response to being heated to a temperature of 30°

C. or higher.

4. The electrode assembly for iontophoresis according to claim 2, wherein the shape-memory separator becomes porous to allow the substance to pass in response to deformation of the shape-memory resin caused by heating the shape-memory separator to a temperature of approximately 40°

C. or higher, the shape-memory separator operable to maintains passage of the substance while being cooled to a temperature of lower than 40°

C.

5. An iontophoresis device comprising:

an electric power source device;

a drug administration device including two or more electrode assemblies which include one or more electrode assemblies having;

an electrode coupled to the electric power source device having a same polarity as that of an ionic drug in the electrode assembly,

an electrolyte solution holding portion holding an electrolyte solution by being impregnated with the electrolyte solution, the electrolyte solution holding portion being placed adjacent to the electrode,

a first ion exchange membrane operable to substantially pass ions having a polarity that is same as a polarity of the ionic drug and substantially block ions having a polarity that is opposite the polarity of the ionic drug, the first ion exchange membrane being placed adjacent to the electrolyte solution holding portion,

a drug solution holding portion holding the ionic drug by being impregnated with the ionic drug, the drug solution holding portion being placed adjacent to the first ion exchange membrane,

a second ion exchange membrane operable to substantially pass ions having a polarity that is opposite the polarity of the ionic drug and substantially block ions having a polarity that is the same as the polarity of the ionic drug, the second ion exchange membrane being placed adjacent to the drug solution holding portion, and

a shape-memory separator capable of being transformed between a first and a second deformation to respectively allow passage of a substance and blocking of the substance, the shape-memory separator placed adjacent to at least one surface of the first ion exchange membrane, the drug administration device coupled to the electric power source device; and

a current control device to control a current flowing to each of the electrode assemblies,

wherein the ionic drug is released from each of the electrode assemblies and transdermally administered to an organism in accordance with the current flowing from the current control device.

6. An electrode assembly for iontophoresis holding an ionic drug, the electrode assembly comprising:

an electrode coupled to an electric power source device having a same polarity as that of the ionic drug in the electrode assembly;

an electrolyte solution holding portion holding an electrolyte solution by being impregnated with the electrolyte solution, the electrolyte solution holding portion being placed adjacent to the electrode;

a first ion exchange membrane operable to substantially pass ions having a polarity that is same as a polarity of the ionic drug and substantially block ions having a polarity that is opposite the polarity of the ionic drug, the first ion exchange membrane being placed adjacent to the electrolyte solution holding portion;

a drug solution holding portion holding the ionic drug by being impregnated with the ionic drug, the drug solution holding portion being placed adjacent to the first ion exchange membrane;

a second ion exchange membrane operable to substantially pass ions having a polarity that is opposite the polarity of the ionic drug and substantially block ions having a polarity that is the same as the polarity of the ionic drug, the second ion exchange membrane being placed adjacent to the drug solution holding portion; and

a shape-memory separator capable of being transformed between a first and a second configuration to respectively allow passage of a substance and blocking of the substance, the shape-memory separator placed adjacent to at least one surface of the second ion exchange membrane.