Biodegradable Polymer Composites for Electrophysiological Signal Sensing
Abstract
:1. Introduction
2. Materials for Biodegradable Polymeric Composites
2.1. Overview of Functional Organic Components
2.2. Conductive Polymeric Materials
2.3. Biodegradable Frame Materials
2.4. Biocompatible Adhesives
3. Electrophysiological Signal Sensing
3.1. Electrophysiological Signals
3.2. Electrocardiography
3.3. Electromyography
3.4. Electroencephalography
3.5. Biodegradability Evaluation of Polymers
4. Future Perspectives and Challenges
- (1)
- One of the applications of bio-signal sensing electrodes is collecting electrophysiological signals over long-term periods by attaching them to the human body. The currently commercialized system has difficulty in continuous monitoring, due to its weight and bulky system size, which restricts the free movement of the patient when it is attached to the body. To overcome the aforementioned issue, it is essential to reduce the weight and size of the measurement system. In terms of application in an integrated sensing system, bio-signal sensing electrodes should be arranged with other components. For this integration, a high-level patterning process is required, and the combinations of materials and processes needs to be further diversified.
- (2)
- The experimental conditions for biodegradation tests should be standardized. Most of biodegradable properties were investigated using a single specific solvent. To realize the full commercialization of biodegradable polymers, it is necessary to specifically characterize the biodegradable properties under various conditions, such as ambient humidity, solvent temperature, and acidity.
- (3)
- The biocompatibility of by-products generated during decomposition should be considered. The organic material itself used as an electrode has biocompatibility when in the form of a polymer, but by-products occurring in the decomposition reaction may be harmful. Therefore, to utilize biodegradable electrodes for practical applications, a sensor design that guarantees the non-toxicity of by-products is required.
- (4)
- The mechanical and chemical stability of polymer composites should be further improved. To continuously monitor electrophysiological signals with polymer composite electrodes, it is necessary to attach an epidermal sensor to the human body under daily. Therefore, composite film electrodes should guarantee sufficient resistance to variables that can occur in the conditions of daily life, such as sweat, movement, and pressure from external contact. For the practical utilization of electrodes, properties such as mechanical durability and adhesion of composites need to be further developed.
- (5)
- Controllable degradation kinetics of components are required for specific applications, such as implantable devices. In the above-mentioned approaches, the degradation rate needs to be programmed for the desired conditions. To meet the above requirements, the control of the dissolution or degradation behavior of BFMs and CPMs needs to be improved.
5. Conclusions and Outlooks
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Materials | Electrophysiology Signal | Signal-to-Noise Ratio | Impedances | Sensitivity | Fabrication Technique | Ref. |
---|---|---|---|---|---|---|
Ag/AgCl | ECG | N/A | 6.2 kΩ at 1 MHz | N/A | N/A | [99] |
Silk adhesive | ECG | N/A | 1.5 kΩ at 1 MHz | N/A | Solution synthesis | [99] |
Ag/AgCl | ECG, EMG | 0.8159 dB | N/A | N/A | N/A | [100] |
MXene-PAA-ACC hydrogel-based electrodes | ECG, EMG | 19.96 dB | N/A | N/A | Solution synthesis | [100] |
Ag/AgCl | ECG, EMG | 32 dB | ~37 kΩ at 100 Hz | N/A | N/A | [108] |
Pencil-drawn electrophysiological electrodes | ECG, EMG | 30 dB | ~40 kΩ at 100 Hz | N/A | Sketch on office paper with 9B pencil | [108] |
Ag/AgCl | ECG, EMG, EOG | 32.2 dB | ~50 kΩ at 10 Hz | N/A | N/A | [109] |
Y-shaped kirigami structure electrode | ECG, EMG, EOG | 22.8 dB | ~70 kΩ at 10 Hz | N/A | Spin coating Laser cutting | [109] |
Ag/AgCl | ECG, EMG | N/A | N/A | 0.29 | N/A | [124] |
Ppy@AM-SF/CNC electrodes | ECG, EMG | N/A | N/A | 0.45 | Solution blended | [124] |
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Lee, D.H.; Park, T.; Yoo, H. Biodegradable Polymer Composites for Electrophysiological Signal Sensing. Polymers 2022, 14, 2875. https://doi.org/10.3390/polym14142875
Lee DH, Park T, Yoo H. Biodegradable Polymer Composites for Electrophysiological Signal Sensing. Polymers. 2022; 14(14):2875. https://doi.org/10.3390/polym14142875
Chicago/Turabian StyleLee, Dong Hyun, Taehyun Park, and Hocheon Yoo. 2022. "Biodegradable Polymer Composites for Electrophysiological Signal Sensing" Polymers 14, no. 14: 2875. https://doi.org/10.3390/polym14142875