Analyte Sensor Adhesive Patch Venting for Longer Skin Wear
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Solution Overview
Problem
Existing analyte monitoring systems, particularly dermal sensors, face issues such as improper insertion due to user error, premature withdrawal, and skin trauma, leading to sensor malfunctions and adverse skin reactions, and there is a need for improved drainage and breathability to enhance wear time and comfort.
Innovation Solution
The sensor control device features an adhesive patch with laser-cut slots and holes for fluid drainage and breathability, along with a mesh structure to allow evaporation of skin fluids, and uses adhesives without isobornyl acrylate (IBOA) to reduce skin irritation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dermal sensors are inserted using short sharps, then the sensor can be implanted in the dermal layer, but improper insertion and premature withdrawal occur due to user error and lack of precision
Solution Approach 1:
The patent combines the sensor control device and applicator into a single integrated unit that cannot be separated by the user. The sensor is pre-loaded in the applicator, and the sharp is pre-attached to the sensor assembly. This merging eliminates user assembly steps and ensures proper alignment during insertion, directly resolving the reliability issue caused by improper user assembly.
Solution Approach 2:
The patent introduces a motion-actuated sharp retraction mechanism as an intermediary between the user's insertion action and the sensor implantation. The sharp remains extended during insertion but automatically retracts when motion is detected, preventing premature withdrawal while maintaining ease of operation. This intermediary mechanism ensures reliable sensor placement without requiring precise user control.
2Duration of action of stationary object
If adhesive patches are used to secure sensor control devices, then the device can be worn on the skin, but fluid accumulation and skin maceration occur reducing wear time
Solution Approach 1:
The patent employs breathable adhesive materials with porous structures that allow fluid vapor to pass through while maintaining adhesion. These porous adhesive layers enable moisture vapor transmission, preventing fluid accumulation and skin maceration under the patch, thereby extending comfortable wear time without compromising skin health.
Solution Approach 2:
The patent extracts and removes accumulated fluids from beneath the adhesive patch through integrated drainage channels and hydrophobic barriers. These structures actively channel away perspiration and other body fluids, preventing their accumulation under the patch and eliminating the harmful effect of maceration, thus extending wear time.
3Strength
If conventional adhesives including IBOA are used in the adhesive patch, then strong adhesion is achieved, but skin irritation and adverse reactions occur
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive by eliminating IBOA and other problematic chemicals while adjusting the adhesive formula to maintain appropriate bond strength. This parameter change removes the harmful effect of skin irritation while preserving the necessary adhesion properties for secure sensor attachment.
Solution Approach 2:
The patent uses composite adhesive materials that combine multiple components with complementary properties. The adhesive layer incorporates skin-friendly polymers, plasticizers, and tackifiers in specific ratios to achieve both strong adhesion and skin compatibility, replacing conventional IBOA-based adhesives with a composite formulation that eliminates irritation while maintaining bond strength.
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
This design reduces the likelihood of improper sensor insertion, minimizes skin trauma, and extends wear time by enhancing fluid management and breathability, improving user comfort and adherence to monitoring plans.
Implementation Method 1
The first layer or the second layer includes laser cut slots or laser cut holes configured for drainage of fluid or breathability of the skin
Implementation Method 2
a mesh structure to allow evaporation of skin fluids
Data Source
AI summary
Sensor control device for analyte monitoring comprising electronics housing having shell defining top surface and mount defining bottom surface of the electronics housing. Adhesive patch coupled to the bottom surface defines central opening, and includes first layer facing the mount and second layer facing skin of user. The first layer has first aperture, second layer has second aperture, and the first aperture and second aperture align with central opening along vertical axis of the sensor control device. First layer or second layer includes laser cut slots or laser cut holes configured for drainage of fluid or breathability of skin.