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This invention describes a patch pump that uses a dry chemical agent to create pressure. When a sponge on the patch gets wet, fluid passes through a special membrane into a chamber where it dissolves the agent. This creates osmotic pressure, which can then be used to drive fluid flow. The claims specify that the agent is on a die-cut film and the chamber is partly embossed into a base material.
Why it matters: Since 2012, advancements in microfluidics manufacturing have made precise embossing of fluid channels and integration of micro-valves more feasible and cost-effective for patch pump designs.
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