Implantable Chemical Sensor Staged Activation Bioerodible Masking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Implantable chemical sensors for monitoring physiological analytes have limited lifespans due to biofouling, foreign body response, and other design limitations, leading to sporadic data collection and frequent replacement needs.
Innovation Solution
The use of implantable medical devices with bioerodible masking layers allows for staged activation of chemical sensors, extending their useful life by isolating some sensors until the masking layer degrades, and a planarization layer with rapid erosion properties ensures timely exposure of sensors to the in vivo environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If implantable chemical sensors are exposed to the in vivo environment immediately after implantation, then they can begin monitoring physiological analytes right away, but their useful life span is limited due to biofouling and foreign body response
Solution Approach 1:
The sensor array is divided into multiple individually maskable sensors, allowing selective exposure timing. Each sensor can be independently activated by removing its masking layer at different times, enabling continuous monitoring capability while individual sensors remain protected until needed.
Solution Approach 2:
Sensors are pre-installed and protected with bioerodible masking layers during implantation, but not activated until the masking layers naturally degrade over time. This preliminary protection allows sensors to be in place without being exposed to the in vivo environment until the desired activation time.
2Duration of action of stationary object
If multiple sensors are implanted to extend monitoring duration, then continuous data collection can be achieved, but device complexity and implantation procedure difficulty increase
Solution Approach 1:
Multiple chemical sensors are integrated into a single implantable device housing with a common interface and control system. The sensors share common electronics, power supply, and communication interfaces, reducing overall device complexity compared to implanting separate sensor devices.
Solution Approach 2:
The implantable device is designed to accommodate multiple sensor types and configurations within a single housing. The device can monitor various physiological analytes simultaneously using different sensor technologies, providing multi-functional capability in one implantation.
3Duration of action of stationary object
If sensors are activated in stages using bioerodible masking layers, then sensor lifespan is extended and continuous monitoring is achieved, but the device requires additional layers and materials increasing manufacturing complexity
Solution Approach 1:
Bioerodible masking layers with different erosion rates are used to control sensor activation timing. By selecting materials with specific degradation characteristics, sensors can be activated at predetermined time intervals after implantation, extending operational lifespan without complex control mechanisms.
4Measurement precision
If blood draws are performed frequently to obtain accurate physiological analyte data, then measurement accuracy is maintained, but patient convenience decreases and frequent medical facility visits are required
Solution Approach 1:
The implantable chemical sensor device performs self-monitoring of physiological analytes continuously without requiring patient action or medical facility visits. The device autonomously measures analyte concentrations in interstitial fluid and transmits data externally, eliminating the need for manual blood draws while maintaining measurement accuracy.
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
This approach enables extended monitoring of physiological analytes beyond the lifespan of a single sensor, reducing the need for frequent replacements and enhancing continuous data collection without the need for frequent patient visits.
Implementation Method 1
A first bioerodible masking layer can be disposed over the second chemical sensor and can seal off the second chemical sensor. The first bioerodible masking layer can include a first material having a first erosion rate
Implementation Method 2
a protective planarization layer disposed over at least one of the first chemical sensor or the second chemical sensor such that the outermost surface of the medical device over the first sensor is flush with the outermost surface of the medical device over the second sensor. The planarization layer can include a second material having an erosion rate that is faster than the erosion rate of the first bioerodible masking layer
Data Source
Figure 1~3
Figure 4
Figure 5~6
AI summary
Embodiments herein include implantable medical devices including chemical sensors with bioerodible masking layers to allow for staged activation of the sensors. In an embodiment, an implantable medical device includes a substrate defining wells and a first chemical sensor and a second chemical sensor disposed within separate wells of the substrate. The first chemical sensor and the second chemical sensor can be configured to detect one or more analytes. The device can include a first bioerodible masking layer disposed over the second chemical sensor, sealing off the second chemical sensor. The device can further include a protective planarization layer disposed over at least one of the first chemical sensor and the second chemical sensor such that the outermost surface of the medical device over the first sensor is flush with the outermost surface of the medical device over the second sensor. Other embodiments are also included herein.