Self-Powered Biomedical Sensors with Hermetic Sealing
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Solution Overview
Problem
Disposable biomedical sensors with wet electrodes face challenges due to limited shelf life caused by drying of conductive gels and corrosion from high humidity and saline environments, which complicates material selection and requires special handling and storage.
Innovation Solution
A self-powered biomedical sensor with a hermetically sealed compartment containing a printed battery and electrolyte, protected by humidity-resistant materials, allowing for long-term storage in high humidity and saline conditions without special handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wet electrodes with high salt content conductive gel are used to improve electrical contact and signal quality, then contact impedance decreases and signal bandwidth extends, but shelf life is limited due to gel drying and material corrosion from high humidity and saline environment
Solution Approach 1:
The sensor is divided into distinct functional layers: conductive gel layer for electrical contact, barrier layer to prevent gel drying and block corrosive vapors, and protective layers for electronic components. This segmentation allows each layer to perform its specific function optimally while protecting the overall system.
Solution Approach 2:
A barrier layer acts as an intermediary between the conductive gel and the external environment. This layer prevents direct contact between the gel and humid air, blocking water vapor and corrosive saline vapors while allowing the gel to maintain its electrical conductivity properties during use.
Solution Approach 3:
The barrier layer creates an inert protective environment around the conductive gel and electronic components, shielding them from the corrosive high-humidity and saline atmosphere that would otherwise cause gel drying and material degradation during storage.
2Duration of action of stationary object
If hermetically sealed packaging is used to protect sensors from humidity and corrosion, then shelf life is extended, but manufacturing complexity and cost increase
Solution Approach 1:
The protective barrier layers are integrated directly into the sensor structure during manufacturing, merging the packaging function with the sensor construction. This eliminates the need for separate hermetic sealing steps and complex external packaging while providing equivalent protection.
Solution Approach 2:
The barrier layer uses selective permeability parameters to allow beneficial moisture retention while blocking harmful corrosive vapors. This parameter optimization provides effective protection without requiring complete hermetic sealing, simplifying the overall packaging design.
3Reliability
If disposable single-use sensors are implemented to improve infection control, then cross-contamination is prevented, but battery handling and recycling requirements increase complexity
Solution Approach 1:
The battery is integrated directly into the disposable sensor assembly, merging the power source with the single-use component. This eliminates separate battery handling, charging, and recycling operations, allowing the entire assembly to be disposed of together after use.
Solution Approach 2:
The sensor including battery is designed as a complete disposable unit that is economically viable for single-use. This approach prioritizes infection control and operational simplicity over battery reuse, accepting the cost of disposable batteries as a trade-off for eliminating complex battery management infrastructure.
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 extends the shelf life of disposable biomedical sensors to 6-12 months or more, reduces material corrosion, and eliminates the need for special handling and recycling, enhancing infection control and usability in hospital settings.
Implementation Method 1
A self-powered biomedical sensor with a hermetically sealed compartment containing a printed battery and electrolyte, protected by humidity-resistant materials
Implementation Method 2
a self-powered single-use biomedical sensor comprising a conductive electrolyte material
Data Source
AI summary
A disposable self-powered biomedical sensor comprises a printed wet electrode on a substrate sheet. The wet electrode is provided with an electrolyte element to enhance the electrical contact with a surface to be measured. Moreover, a printed battery encapsulated in a hermetically sealed compartment is provided on the substrate sheet. The disposable self-powered sensor can be stored within an enclosure or a package which provides a proper atmosphere to prevent the drying of the electrolyte and prolong the shelf life of the sensors.