OSMOTIC PATCH PUMP
First Claim
1. An osmotic patch pump comprising:
- a dry agent that exerts an osmotic pressure when dissolved by a fluid;
a chamber containing the dry agent and having a chamber wall made of a semi-permeable membrane that allows fluid to enter the chamber through the membrane, but that does not allow dissolved agent to escape from the chamber through the membrane;
a sponge having a surface in contact with an outer surface of the semi-permeable membrane and configured to soak up fluid when placed in contact with the sponge;
an injector configured to inject dissolved agent into or below a patient'"'"'s skin; and
an injector fluid communication channel that allows dissolved agent to flow from the chamber to the injector.
1 Assignment
0 Petitions
Accused Products
Abstract
An osmotic patch pump may include a dry agent on a die-cut piece of film that may exert an osmotic pressure when dissolved by a fluid. A chamber may contain the dry agent and have a chamber wall made of a semi-permeable membrane that allows fluid to enter the chamber through the membrane, but does not allow dissolved agent to escape from the chamber through the membrane. A sponge may have a surface in contact with an outer surface of the semi-permeable membrane and may be configured to soak up fluid when placed in contact with the sponge. Flow volume and rate may be controlled by user-operated micro valves. The chamber and fluid communication channels may be embossed on a substrate as part of a simple and low cost manufacturing process.
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Citations
20 Claims
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1. An osmotic patch pump comprising:
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a dry agent that exerts an osmotic pressure when dissolved by a fluid; a chamber containing the dry agent and having a chamber wall made of a semi-permeable membrane that allows fluid to enter the chamber through the membrane, but that does not allow dissolved agent to escape from the chamber through the membrane; a sponge having a surface in contact with an outer surface of the semi-permeable membrane and configured to soak up fluid when placed in contact with the sponge; an injector configured to inject dissolved agent into or below a patient'"'"'s skin; and an injector fluid communication channel that allows dissolved agent to flow from the chamber to the injector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An osmotic patch pump comprising:
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a dry agent that exerts an osmotic pressure when dissolved by a fluid; a die-cut piece of film containing the dry agent; a chamber containing the die-cut piece of film and the dry agent and having a chamber wall made of a semi-permeable membrane that allows fluid to enter the chamber through the membrane, but that does not allow dissolved agent to escape from the chamber through the membrane; an injector configured to inject dissolved agent into or below a patient'"'"'s skin; and an injector fluid communication channel that allows dissolved agent to flow from the chamber to the injector.
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18. An osmotic patch pump comprising:
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a dry agent that exerts an osmotic pressure when dissolved by a fluid; a chamber containing the dry agent and having a chamber wall made of a semi-permeable membrane that allows fluid to enter the chamber through the membrane, but that does not allow dissolved agent to escape from the chamber through the membrane; an injector configured to inject dissolved agent into or below a patient'"'"'s skin; and multiple injector fluid communication channels, each configured to channel a different portion of dissolved agent from the chamber to the injector; and for each injector fluid communication channel, a user-operable valve configured to controllably block the flow of dissolved agent through the injector fluid communication channel when the valve is closed; wherein the multiple injector fluid communication channels and the user-operable valves collectively cause the rate at which dissolved agent flows from the chamber to the injector to be a function of the number of valves that are open.
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19. A method of making an osmotic patch pump comprising:
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creating a substrate for the pump; positioning an injector that is configured to inject dissolved agent into or below a patient'"'"'s skin on the substrate; embossing a portion of a chamber and a portion of an injector fluid communication channel from the portion of the chamber to the injector into the substrate; placing a dry agent that exerts an osmotic pressure when dissolved by a fluid within the portion of the chamber; and completing the chamber by affixing a semi-permeable membrane to the substrate. - View Dependent Claims (20)
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Specification