Dynamic Thermal Compensation for Ophthalmic Pressure Sensors
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Solution Overview
Problem
During ophthalmic surgical procedures, maintaining a proper balance between irrigation and aspiration of fluids to and from the eye is crucial to prevent fluctuations in intraocular pressure (IOP), which can lead to complications such as low IOP, anterior chamber collapse, or high IOP and eye damage.
Innovation Solution
A method and system for measuring fluid pressure using a surgical handpiece equipped with a pressure sensor, which includes a flexible diaphragm and a sensing circuit with semiconductor strain gages. The system adjusts fluid pressure measurements by determining a predicted sensor zero offset based on temperature measurements, using a correlation function to ensure accurate IOP monitoring despite temperature-induced drift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure sensor is used to measure fluid pressure in the handpiece device, then fluid pressure measurement is obtained, but temperature-induced zero offset drift causes measurement inaccuracy at elevated temperatures
Solution Approach 1:
The patent applies parameter changes by using a temperature compensation algorithm that adjusts the pressure sensor's zero offset based on temperature measurements. The system measures temperature and dynamically changes the zero offset parameter to compensate for thermal drift, thereby maintaining measurement accuracy across varying temperature conditions
Solution Approach 2:
The patent implements feedback by continuously monitoring temperature and using this information to adjust the pressure sensor's zero offset in real-time. The temperature measurement feeds back into the compensation algorithm, which then corrects the pressure readings to maintain accuracy despite temperature-induced drift
2Reliability
If irrigation fluid is provided at a higher flow rate to maintain intraocular pressure, then IOP is maintained, but fluid may accumulate in the eye causing high IOP and potential eye damage
Solution Approach 1:
The patent uses feedback by continuously monitoring fluid pressure in the handpiece and using this information to dynamically adjust irrigation and aspiration flow rates. The real-time pressure data feeds back to the control system, which modulates fluid delivery to maintain safe and effective intraocular pressure throughout the surgical procedure
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
The system enables accurate and reliable measurement of intraocular pressure during ophthalmic surgeries, even at elevated temperatures, thereby preventing complications associated with IOP fluctuations and improving surgical efficiency.
Implementation Method 1
a flexible diaphragm having a pressure medium side and a circuit side
Implementation Method 2
a sensing circuit having four semiconductor strain gages connected as a Wheatstone bridge
Implementation Method 3
a sensing circuit having four semiconductor strain gages connected as a Wheatstone bridge
Data Source
AI summary
Embodiments of the present disclosure generally relate to systems and methods for measuring intraocular pressure (IOP) during ophthalmic surgery. In some embodiments, a method for measuring IOP is provided. The method includes measuring fluid pressure in a fluid flow path of a handpiece device using a pressure sensor disposed therein to obtain a fluid pressure measurement, determining a sensor temperature measurement of the pressure sensor, determining a predicted sensor zero offset based on the sensor temperature measurement using a determined zero offset correlation function, and adjusting the fluid pressure measurement with the predicted sensor zero offset to obtain an adjusted fluid pressure measurement.