The development of a miniaturized implantable oxygen sensor to understand tissue oxygenation

Oxygen is necessary for the human body to function properly. On the other hand, illness or damage can alter the tissues' equilibrium of oxygen uptake and delivery.

This may go unnoticed, leading to the progression of potentially dangerous medical disorders that are not identified and treated.

The condition of Hypoxia and Anastomosis Leak can be monitored and detected early by Continuous tissue oxygenation monitoring during the post-operative recovery period would provide early and accurate identification of further risks leading to sepsis.

Tissue oxygen monitoring in real-time has the potential to significantly enhance patient outcomes by enabling early imbalance detection and customised therapy planning. This project proposes the development of a miniaturized implantable oxygen sensor to understand tissue oxygenation.

The sensor can be fabricated with the adoption of the three-electrode electrochemical cell on a flexible substrate and the addition of the microstructured arrays over the sensor with a Hydrogel casting with the use of Lithography.

A series of immunological reactions, such as the complement system, the fibrinolytic system, the intrinsic and extrinsic coagulation cascades, and thrombus formation, are started upon device incision and implantation. They combine to form a foreign body reaction or inflammatory response. The biofouling due to the proteins and microorganisms might occur affecting the sensitivity of the sensor.

The anti-biofouling strategies must be inculcated into the sensor fabrication to reduce Implant infection. The sensor must be biocompatible and biofunctionable.

To achieve this, the use of biomimicking materials such as Naturally occurring Collagen or microgels or polymers such as the Poly ethylene Glycol is preferred.

However, This might require a certain modification at the Synthesis or the application level to attain the anti-biofouling properties in a better way which might result in the long use of the sensor.

The sensor fabricated is less invasive and the performance is tested with electrochemical analytical techniques such as Cyclic Voltammentry, Chronoamperometry etc.

This detailed characterization informs the optimization process, enhancing sensitivity, specificity, and overall sensor performance.

Employing iterative design processes to focus on sensor architecture, material selection, and electronic integration ensures a continual refinement of the sensor,optimizing it for heightened sensitivity and specificity.

To achieve the substantial performance of the sensor, the microarrays must be designed to undergo patterning using Lithographic techniques.

Though the design of the array or the patterns can be done using software, the actual pattern of the sensor can be varied based on the Lithographic parameters such as pitch.

Subjecting the sensor to rigorous testing using controlled samples and simulated conditions, The iterative refinement process is driven by testing results, guaranteeing reliability and accuracy.

Implementing the FEM & Multiphysics simulation techniques to modify the sensor design and explore the effect of biofouling on oxygen diffusion and support electrode design improvements.

The elevated risk of infection along the sensor implantation can be a concern and the materials used for hydrogel casting should alleviate the risk of sensor degradation and the risk of infection.This sensor can be further elevated with the integration of the Body Area Networks and IoT for better monitoring