Stick-on Biosensor Adhesive Rigidity and Skin Conformability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Biosensors face issues with electrode detachment and signal noise when the skin is crinkled during measurement, leading to unsatisfactory acquisition of biological information.
Innovation Solution
A stick-on biosensor design featuring a pressure-sensitive adhesive layer with a flexural rigidity of 0.010 MPa·mm^3/mm or higher and adhesive strength between 0.6 N/cm^2 and 5.0 N/cm^2, ensuring secure attachment and stable signal acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the biosensor uses a conventional plate-like polymer structure, then the structural integrity is maintained, but the electrode peels off from the living body when skin is crinkled
Solution Approach 1:
The patent optimizes the flexural rigidity parameter of the pressure-sensitive adhesive layer to be within the specific range of 0.001 to 0.05 MPa·m², which resolves the contradiction between maintaining structural integrity and preventing electrode peeling. This parameter optimization allows the adhesive layer to be flexible enough to conform to crinkled skin while maintaining sufficient adhesive strength.
Solution Approach 2:
The patent employs a composite structure consisting of a pressure-sensitive adhesive layer combined with a base material layer. This composite material approach enables the biosensor to achieve both the required flexibility for skin conformability and the necessary mechanical strength for reliable electrode attachment, resolving the contradiction between these two requirements.
2Reliability
If the biosensor uses a rigid structure, then the structural stability is maintained, but gaps are produced between the sensor and crinkled skin
Solution Approach 1:
The patent changes the flexural rigidity parameter from a high value (rigid structure) to a low value within the range of 0.001 to 0.05 MPa·m². This parameter change enables the biosensor to conform to crinkled skin surfaces, eliminating gaps and improving signal acquisition quality while maintaining adequate structural stability through the composite layer design.
3Reliability
If the adhesive strength is increased to prevent peeling, then the electrode attachment is improved, but the biosensor cannot conform to crinkled skin
Solution Approach 1:
The patent optimizes the flexural rigidity parameter to a low range (0.001 to 0.05 MPa·m²), which enables the adhesive layer to conform to crinkled skin while maintaining sufficient adhesive strength. This parameter optimization resolves the contradiction by allowing the material to be both flexible and adhesive simultaneously.
Solution Approach 2:
The composite structure of the pressure-sensitive adhesive layer and base material layer provides a solution where the adhesive layer offers flexibility and conformability, while the base material provides structural support. This composite approach enables both skin conformability and reliable electrode attachment.
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 biosensor maintains secure attachment and reduces noise, enabling the acquisition of satisfactory biological information even with skin movement, by optimizing flexural rigidity and adhesive strength.
Implementation Method 1
a pressure-sensitive adhesive layer with a flexural rigidity of 0.010 MPa·mm^3/mm or higher and adhesive strength between 0.6 N/cm^2 and 5.0 N/cm^2, ensuring secure attachment
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A stick-on biosensor capable of acquiring satisfactory biological information is provided. The stick-on biosensor includes a pressure-sensitive adhesive layer and an electrode part, said pressure-sensitive adhesive layer having a stick-on surface to be attached to a subject; a base material layer provided on the side opposite the stick-on surface of the pressure-sensitive adhesive layer; and an electronic device provided on the base material layer and configured to process a biological signal acquired through the electrode part. A structure, which includes the pressure-sensitive adhesive layer, the electrode part, and the base material layer, has a flexural rigidity of 0.010 [MPa·mm3/mm] or higher, and an adhesive strength of the electrode part to adhere to the subject is greater than 0.6 [N/cm2] and less than or equal to 5.0 [N/cm2].