Implantable Intraocular Pressure Sensor Using Strain Gauge
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Solution Overview
Problem
Current methods for monitoring intraocular pressure in glaucoma patients are inadequate for continuous, long-term assessment, particularly in varying conditions, which can lead to irreversible damage and blindness if not managed effectively.
Innovation Solution
An implantable intraocular pressure sensor system with a sealed geometric shape containing a strain gauge wire that measures resistance changes due to pressure, coupled with a processor and memory for data logging and alerting mechanisms, allowing for real-time monitoring and alerting of elevated pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current monitoring methods are used, then simplicity is maintained, but measurement precision and reliability of continuous IOP assessment deteriorate
Solution Approach 1:
The patent employs a flexible membrane as the sensing element that deflects in response to intraocular pressure changes. This thin film structure enables precise pressure measurement through deflection while maintaining a compact, implantable form factor that balances measurement precision with device simplicity
Solution Approach 2:
The patent replaces complex mechanical pressure sensing mechanisms with a strain gauge-based electrical measurement system. The strain gauge converts mechanical deflection of the membrane into electrical resistance changes, enabling precise IOP measurement with simpler electronics rather than complex mechanical linkages
2Reliability
If current monitoring methods are used, then device complexity is low, but reliability of long-term continuous assessment deteriorates
Solution Approach 1:
The patent implements continuous IOP monitoring through an implantable sensor that continuously measures pressure and transmits data. The system maintains uninterrupted monitoring capability with power management that enables long-term operation, ensuring reliable continuous assessment without requiring frequent intervention
Solution Approach 2:
The patent incorporates alert mechanisms that automatically notify patients and medical staff when IOP exceeds threshold values. The system performs self-monitoring and self-alerting functions, reducing the need for manual checking and improving reliability of continuous assessment while keeping the user interface simple
3Loss of time
If real-time monitoring is implemented, then loss of time for detection is reduced, but device complexity increases
Solution Approach 1:
The patent sets predetermined alert thresholds for IOP values before implantation. When pressure reaches these pre-established levels, the system automatically triggers alerts, eliminating detection delays and enabling immediate response to dangerous pressure conditions without complex real-time analysis algorithms
Solution Approach 2:
The patent implements a feedback loop where IOP measurements are continuously taken, compared against threshold values, and alerts are generated when thresholds are exceeded. This closed-loop system provides immediate feedback on pressure status, reducing detection time while maintaining manageable system complexity through simple threshold comparison logic
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
Enables continuous, accurate measurement of intraocular pressure, providing timely alerts to patients and medical staff, thereby aiding in the management of glaucoma and preventing vision loss.
Implementation Method 1
A strain gauge wire is embedded in a surface of the sealed geometric shape. When the surface is deflected a measured resistance of the strain gauge wire indicates an intraocular pressure.
Data Source
AI summary
An implantable intraocular pressure sensor system has a sealed geometric shape with an internal pressure at a first value. A strain gauge wire is embedded in a surface of the sealed geometric shape. When the surface is deflected by intraocular pressure, a measured resistance of the strain gauge wire indicates the intraocular pressure. The system also has a processor coupled to a power source and memory. The processor is configured to read the measured resistance and write values corresponding to intraocular pressure to the memory.