## 8 Technical Improvements
### Monitoring Local Changes Surrounding  
As mentioned previously in Section 6.2, one of the potential improvements is the design concept for developing a completely biodegradable implant for in-vivo operation, a wireless biodegradable radio frequency-driven resistor-inductor-capacitor (RLC) resonator that is miniaturized and constructed with biodegradable metals and biodegradable conductive polymer. According to [39], it was concluded that since the resonance peak was still detectable within 6 mm of muscle and fat tissues when located between the RLC resonator and the measurement coil for both metal and polymer resonators even if largely attenuated, the utilization of these materials to manufacture passive wireless communication devices in biosensors implanted within the body is potentially feasible. At this moment, the most reliable candidate to manufacture the RLC resonators is magnesium due to its high conductivity and exceptional biodegradability. In addition, the rate of corrosion can be altered by alloying the magnesium if faster degradation is required or if the implant's mechanical properties needs to be more \begin{table}
\begin{tabular}{p{85.4 pt} p{113.8 pt} p{113.8 pt}} \hline \hline
**Technique** & **Capability** & **Limitation** \\ \hline Electrochemical-based monitoring system & Quantitative measurements and electrochemical properties can be obtained in a short period of time. & Limited electrode life leads to inability to conduct continuous in-vivo corrosion monitoring affecting quality and accuracy of data over a period of time. Replacement of electrodes might also be costly. \\ \hline Microsensor-based monitoring system & Some corrosion parameters can be measured accurately (e.g., hydrogen sensor). It has potential for real-time applications, but the sensor must be paired with a data processing device. & Needs special processing software (i.e., image or signal) to convert the raw data to obtain desired data. \\ \hline Microdialysis-based monitoring system & Can be developed for real-time monitoring when probe is connected to a data processing device. & Restrictive probe life/performance due to potential biofouling and difficult to calibrate. \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Capabilities and limitations comparison of the real-time in-vivo corrosion monitoring techniques [4]. enhanced. In addition, the biodegradable conducting polymers PCL-PPy and PLLA-PPy have been attracting attention due to their light mass, high flexibility in the manufacturing process, and their compatibility with MRI and X-rays [39]. As of now, the continued development of biodegradable RLC resonators is the first step towards making a completely biodegradable implant for in-vivo scenarios. [PERSON] et al. [39] acknowledges that a great deal of effort is required before being able to manufacture fully biodegradable biomedical implants while also stating that this progress would be beneficial in the future for the patient's safety and comfort. Another potential technique of real-time in-vivo corrosion monitoring is a monitoring device that use needle type microelectrode as a biosensor as has been presented and proposed by [PERSON] et al. [44] to measure glucose in the brain. An earlier study that proposed ion-selective micro-electrodes for mapping local activity of Mg\({}^{2+}\) and H\({}^{+}\) is presented in [45]. In the future, an appropriate needle type microelectrode can be developed to measure one or more corrosion rate properties such as weight loss rate of the metal implant and certain ion release. The needle type microelectrode can also be connected to the data acquisition (DAQ) device for automatic timely basis of real-time measurement or monitoring. In detail, the DAQ device will be used for signal conditioning and converting the analog signal to digital signal for further data processing.