External Pressure Transducer Cannula for Accurate Intraocular Sensing
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Solution Overview
Problem
Existing devices for measuring intraocular pressure during surgical procedures require large incisions, are prone to measurement inaccuracies due to environmental disturbances, and fail to detect pressure variations caused by external factors or eyeball manipulation.
Innovation Solution
A device with a pressure transducer located outside the body cavity, using a flexible cannula and a piezoelectric sensor to detect pressure variations through a compressible air column, minimizing invasive procedures and immune to environmental disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure transducer is integrated on the surgical instrument inserted into the ocular cavity, then intraocular pressure can be measured directly, but a larger ocular incision is required and the transducer proximity to surgical instruments causes measurement disturbances and inaccuracies
Solution Approach 1:
The device separates the pressure measurement function from the surgical instrumentation function. The pressure sensor is housed in a separate reservoir connected to the ocular cavity through a fluid communication pathway, allowing independent positioning of the sensor away from the surgical site while maintaining measurement capability.
Solution Approach 2:
A fluid communication pathway acts as an intermediary between the ocular cavity and the pressure sensor. This pathway transmits pressure information from the measurement location to the sensing location, enabling remote measurement without direct contact between the sensor and the ocular cavity.
2Device complexity
If a pressure sensor is housed in the pump reservoir to measure fluid pressure, then intraocular pressure can be monitored indirectly during infusion or aspiration, but pressure variations caused by external factors or eyeball manipulation cannot be measured
Solution Approach 1:
The fluid communication pathway serves as an intermediary that directly transmits pressure variations from the ocular cavity to the sensor, capturing both infusion-related and external manipulation-induced pressure changes without the limitations of indirect pump reservoir measurement.
3Reliability
If the transducer is located outside the body with the cannula anchored to a distant point, then measurement interference is minimized, but the device requires proper anchoring and positioning
Solution Approach 1:
The pressure transducer is extracted from the surgical instrument and housed in a separate reservoir positioned outside the ocular cavity. This extraction eliminates measurement interference from surgical operations while the fluid communication pathway maintains the measurement connection.
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 reliable, real-time, and minimally invasive detection of pressure variations within the body cavity, reducing complications and improving surgical safety and efficacy.
Implementation Method 1
A device comprising a piezoelectric pressure transducer and a flexible cannula that transmits pressure changes from the eye cavity to the transducer
Data Source
AI summary
A device for directly detecting pressure variations of a fluid within a body cavity is provided. The device has a pressure transducer, a pressure transmission device extending between a distal tip suitable for partial insertion into the body cavity and a proximal port in direct contact with a sensing surface of the pressure transducer. The distal tip forms an access port that places the pressure transducer outside the body cavity into direct fluid communication with the inside of the body cavity. The pressure transmission device has, between the distal tip and the proximal port, a flexible cannula having a length sufficient to allow anchoring of an intermediate stretch of the flexible cannula and/or the pressure transducer to an anchoring zone distant from the body cavity.