Optical Fiber Pressure Sensor for Intraocular Measurement
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Solution Overview
Problem
Current methods for measuring intraocular pressure during ophthalmic surgery are inaccurate due to distance-based pressure measurements, which introduce errors from flow resistance and time delays, necessitating a more direct and precise measurement approach.
Innovation Solution
The ophthalmic surgical system incorporates a pressure sensor positioned proximal to the eye, utilizing optical fiber or MEMS-based sensors within the eye or along the infusion line to accurately measure pressure, allowing for real-time adjustments to maintain optimal intraocular pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If pressure is measured at a proximal end of an infusion line using a pressure sensor located on a surgical console, then the measurement system is simple and remote from the eye, but measurement accuracy deteriorates due to flow resistance and time delays
Solution Approach 1:
A fluid coupling mechanism (such as a flexible membrane or fluid-filled cavity) is introduced as an intermediary between the pressure sensor and the infusion line. This intermediary transmits pressure changes from the infusion line to the sensor while allowing the sensor to be positioned remotely on the surgical console, thereby maintaining both measurement accuracy and system simplicity
2Speed
If pressure is measured at a proximal end of an infusion line, then the response time is fast, but measurement accuracy deteriorates due to flow resistance in the infusion line
Solution Approach 1:
A fluid coupling mechanism serves as an intermediary that directly transmits pressure changes from the infusion line to the sensor without requiring the sensor to be positioned at the distal end. This eliminates the trade-off between response time and accuracy by providing a direct pressure transmission path while allowing remote sensor placement
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 provides more accurate and timely pressure measurements, enabling precise control of fluid infusion and drainage to maintain desired intraocular pressure levels, reducing the risk of eye collapse and damage during surgery.
Implementation Method 1
the distal end of the optical fiber includes a first reflective surface and a second reflective surface. The first and second reflective surfaces are separated by a cavity
Data Source
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AI summary
An ophthalmic surgical system enabling pressure measurements proximal to the eye may include an illumination probe having a probe tip configured for insertion through an incision in an eye of a patient. The probe tip may include a distal end of an optical fiber, wherein the distal end of the optical fiber includes a first reflective surface and a second reflective surface. The first and second reflective surfaces being separated by a cavity, wherein the second reflective surface is provided by a partially transparent wall forming an exterior surface of the distal end of the optical fiber.