Ophthalmosurgical Pump Pressure Control Using Partition Position Feedback
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Solution Overview
Problem
Existing ophthalmosurgical systems face challenges in maintaining precise regulation of intraocular pressure due to variations in the properties of the elastic partition elements in fluid pumps, which affect the pressure of treatment fluids, leading to deviations beyond the desired precision range for effective intraocular pressure control.
Innovation Solution
The method involves subjecting the drive fluid to multiple pressures to detect different positions of the elastic partition element, using sensors to measure treatment fluid pressures at these positions, and incorporating this data into the operation of the fluid pump to improve regulation, without requiring additional pressure sensors for the treatment fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the elastic partition element is used to separate the pump chamber and drive chamber, then the fluid pump can achieve rapid and reliable actuation with minimal maintenance, but variations in the properties of the partition element cause deviations in treatment fluid pressure that reduce measurement precision
Solution Approach 1:
The patent implements a feedback mechanism where the detected treatment fluid pressure is fed back to the control device, which then adjusts the drive pressure to compensate for pressure deviations. This closed-loop control system continuously monitors and corrects pressure variations caused by partition element property variations, thereby maintaining measurement precision while preserving the reliability benefits of the elastic partition element design.
Solution Approach 2:
The control device dynamically changes the drive pressure parameter based on detected treatment fluid pressure deviations. By adjusting the drive pressure in response to measured pressure variations, the system compensates for inconsistencies in the partition element's mechanical properties, ensuring accurate treatment fluid pressure delivery without requiring a different partition element design.
2Measurement precision
If additional sensors are added to measure treatment fluid pressure at multiple positions, then measurement precision can be improved, but device complexity and cost increase
Solution Approach 1:
The patent makes the detection sensor multi-functional by using it for both calibrating the fluid pump's pressure characteristics and for continuous monitoring of treatment fluid pressure during operation. This single sensor performs multiple functions that would otherwise require separate measurement systems, thereby improving measurement precision without increasing device complexity or adding expensive additional sensors.
Solution Approach 2:
The system uses its own operational data (drive pressure and partition element position) combined with treatment fluid pressure measurements to self-calibrate and characterize its performance. By utilizing existing system components and operations for calibration purposes, the patent avoids the need for separate calibration equipment or additional sensors, maintaining simplicity while achieving high measurement precision.
3Adaptability or versatility
If the drive pressure is varied to accommodate different surgical requirements, then adaptability is improved, but fluctuations in intraocular pressure occur that reduce stability
Solution Approach 1:
The control device uses real-time feedback from the detection sensor to continuously monitor treatment fluid pressure and make immediate adjustments when drive pressure changes are implemented. This feedback mechanism ensures that when drive pressure is varied for different surgical requirements, the resulting changes in treatment fluid pressure are precisely controlled, thereby maintaining intraocular pressure stability while preserving system adaptability.
Solution Approach 2:
The patent implements dynamic control where the drive pressure is continuously adjusted based on real-time pressure measurements rather than using fixed pressure settings. This dynamic adaptation allows the system to respond to changing surgical requirements while maintaining stable intraocular pressure through continuous, small adjustments rather than large, disruptive pressure changes.
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 allows for more precise regulation of treatment fluid pressures, ensuring consistent intraocular pressure during surgical procedures, enhancing the reliability and precision of ophthalmosurgical systems.
Implementation Method 1
a fluid pump (10; 20; 30; 40) for conveying the treatment fluid... having a pump chamber (11; 21; 31; 41), and a drive chamber (13; 23; 33; 43), which is separated from the pump chamber with an elastic partition element (12; 22; 32; 42)
Data Source
AI summary
A method for operating a fluid pump of an ophthalmosurgical system for conveying a treatment fluid is provided. The fluid pump has a pump chamber and a drive chamber separated from the latter with an elastic partition element and which is acted upon by a drive fluid. A position of the partition element is detected. The method includes subjecting the drive fluid to a first drive pressure, detecting a treatment fluid pressure present in the first position of the partition element, subjecting the drive fluid to a further drive pressure, at which the partition element adopts a further position, detecting the at least one further position of the partition element, and a further treatment fluid pressure present in this further position, and taking into account the treatment fluid pressures and drive pressures present in the respective positions account in the operation of the fluid pump.