Dynamic Surface Profiles for Comfortable In Vivo Analyte Sensors
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Solution Overview
Problem
Existing analyte sensors face challenges with prolonged contact to hard materials causing discomfort, bruising, and inaccurate measurements due to tissue trauma, while softer materials lack sensor insertion and localization benefits.
Innovation Solution
Incorporation of dynamic materials within the surface profile that transition from a hard state to a softer state over time, providing both comfort and effective sensor insertion and localization, with potential drug delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If hard materials are used in the surface profile, then sensor insertion and localization are improved, but user comfort and tissue health deteriorate due to prolonged contact causing discomfort, bruising, and tissue trauma
Solution Approach 1:
The surface profile transitions from a hard state to a softer state over time through dynamic material properties. Initially, the hard material provides structural support for accurate sensor insertion and localization. Over time, the material softens to reduce tissue trauma and improve user comfort during extended wear periods.
Solution Approach 2:
The material hardness parameter changes over time from a hard state to a softer state. This temporal parameter change allows the surface profile to provide both initial structural support for sensor placement and long-term comfort for extended wear without causing tissue damage.
2Object-affected harmful factors
If softer materials are used in the surface profile, then user comfort is improved, but sensor insertion and localization capabilities are reduced
Solution Approach 1:
Rather than using static soft material, the invention employs dynamic material that changes its mechanical properties over time. The material starts hard to enable precise sensor insertion and localization, then transitions to a softer state to provide comfort during extended wear.
Solution Approach 2:
The hard state of the material performs the preliminary action of facilitating accurate sensor insertion and localization. After this initial function is accomplished, the material transitions to a softer state for comfort during the extended wear period.
3Strength
If the surface profile maintains a hard state for extended wear, then structural support is maintained, but tissue irritation increases and wear time is limited
Solution Approach 1:
The material hardness parameter evolves over time, starting hard to provide structural support for sensor placement, then gradually softening to reduce tissue irritation and enable extended wear periods without compromising initial structural integrity.
Solution Approach 2:
The surface profile employs dynamic material properties that allow it to maintain structural support when needed while transitioning to a more compliant state for extended comfort. This dynamic behavior extends the functional wear time of the sensor device.
4Object-affected harmful factors
If the surface profile is made compliant, then tissue irritation is reduced, but sensor localization precision is compromised
Solution Approach 1:
The surface profile uses dynamic material that provides initial compliance for comfortable tissue contact while maintaining sufficient structural integrity for accurate sensor localization. The material's time-dependent behavior allows it to be compliant enough to reduce irritation while still providing the precision needed for proper sensor placement.
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
Enhances user comfort, improves sensor reliability, and extends wear time by softening to reduce tissue irritation and enhance perfusion, while maintaining accurate analyte detection.
Implementation Method 1
a dynamic surface profile that transitions from a hard state to a softer state over time
Implementation Method 2
the protrusion may increase perfusion by applying a pressure profile to the skin, which results in a biological response of pressure-induced vasodilation
Data Source
AI summary
Medical devices configured for in vivo assays of one or more analytes can sometimes be problematic if left inserted in a tissue, such as skin, for an extended time. Certain medical device surface profiles may aid in alleviating this issue. Accordingly, medical devices may comprise a base surface having a tissue-facing surface profile defined thereon, and a sensor extending through the base surface and at least a portion of the tissue-facing surface profile. The tissue-facing surface profile deviates from the base surface, and the tissue-facing surface profile is also configured to undergo a change in shape, hardness, or a combination thereof after contacting a tissue for a length of time. A dynamic material may be present in at least a portion of the tissue-facing surface profile.