Polymeric Actuator for Low-Profile Medication Delivery
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Solution Overview
Problem
Conventional actuators are bulky and uncomfortable for patients, limiting their ability to deliver large volumes of medication efficiently and accurately, especially for high potency medications, and lack a separator material to isolate ionic or pH boundaries, affecting response accuracy and range.
Innovation Solution
A low-profile polymeric actuator assembly with a porous electrode separator material that changes volume in response to pH changes in an electrolyte, powered by a controlled charge input, to displace a collapsible reservoir for precise and efficient fluid delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional actuators are used to deliver medication, then the actuator can generate sufficient force, but the actuator becomes bulky and uncomfortable for patients
Solution Approach 1:
The patent replaces conventional mechanical actuators (motors, hydraulic cylinders) with a polymeric actuator that responds to pH changes in an electrolyte. This chemical-to-mechanical transduction eliminates bulky mechanical components while maintaining actuation capability, directly resolving the contradiction between force generation and compact size.
Solution Approach 2:
The patent changes the operating parameter from electrical/mechanical control to pH/electrolyte concentration control. By manipulating the pH of the electrolyte, the polymeric actuator changes its volume and generates force, enabling compact actuation without sacrificing performance.
2Reliability
If conventional actuators are used, then the actuator can operate reliably, but the actuator lacks a separator material to isolate ionic or pH boundaries, affecting response accuracy
Solution Approach 1:
The patent introduces a porous separator material as an intermediary component between the electrolyte and the polymeric actuator. This separator isolates ionic or pH boundaries, ensuring that pH changes are localized and controlled, thereby improving both the reliability of actuation and the precision of the response.
Solution Approach 2:
The patent employs a porous separator material that allows selective ion transport while maintaining pH boundary isolation. The porous structure enables ionic conductivity necessary for actuator operation while preventing uncontrolled pH diffusion, simultaneously achieving reliability and measurement precision.
3Quantity of substance
If conventional actuators are used, then the actuator can deliver medication, but the actuator cannot deliver large volumes of medication efficiently and accurately
Solution Approach 1:
The patent employs a collapsible reservoir that dynamically changes shape as medication is delivered. The reservoir collapses inward as fluid is expelled, maintaining efficient contact with the polymeric actuator throughout the delivery process. This dynamic design enables accurate delivery of large volumes without sacrificing efficiency.
Solution Approach 2:
The patent segments the medication delivery system into distinct functional components: a collapsible reservoir for volume storage, a porous separator for controlled release, and a polymeric actuator for actuation. This segmentation allows each component to optimize its function, enabling efficient and accurate delivery of large medication volumes.
4Volume of moving object
If a low-profile actuator is designed, then the device becomes compact, but the actuator may lack the power to displace large reservoirs
Solution Approach 1:
The patent uses the electrolyte as a hydraulic medium to transmit force from the polymeric actuator to the collapsible reservoir. The incompressible nature of the electrolyte allows efficient force transmission, enabling a compact actuator to generate sufficient power to displace large volumes of medication through hydraulic amplification.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables a compact, efficient, and accurate medication delivery system that improves comfort and increases the volume of medication that can be administered, while ensuring precise control over medication dosage and reducing the risk of errors or delays in pain therapy.
Implementation Method 1
a polymeric actuator configured to generate a large linear displacement over an area in response to a change in an ionic concentration or pH of an electrolyte
Implementation Method 2
the state of the art polymer actuators do not include a separator material to isolate and create distinct ionic or pH boundaries of the electrolyte at the anode or cathode side of the electrodes
Data Source
AI summary
A polymer actuator, power supply and method of using the activation are described.