Ophthalmic Fluid Pump Control With Pressure and Deflection Feedback
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Solution Overview
Problem
Existing ophthalmic surgical systems face challenges in accurately controlling irrigation and aspiration fluids due to variations in fluid pump components, leading to potential inaccuracies in fluid delivery and aspiration during surgical procedures.
Innovation Solution
The system employs dual fluid pumps with elastic partition elements, pressure and position sensors, and a connection line to directly link irrigation and aspiration fluid lines, enabling precise control through a processing unit that adjusts fluid pressures and flow rates based on sensor data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple fluid pumps are used for irrigation and aspiration, then both fluid delivery functions can be achieved, but manufacturing variations cause inaccuracies in fluid control
Solution Approach 1:
The patent merges irrigation and aspiration fluid control into a single integrated pump system. The pump assembly includes an irrigation fluid pump and an aspiration fluid pump that share common components (drive mechanism, housing, control system), reducing manufacturing variations and improving coordination between irrigation and aspiration flows.
Solution Approach 2:
The system incorporates sensors that detect actual irrigation fluid flow and aspiration fluid flow, feeding this information back to the control system. The controller adjusts pump operation based on feedback from these sensors to maintain desired flow rates despite manufacturing variations, achieving accurate fluid control through closed-loop control.
2Adaptability or versatility
If multiple fluid pumps with different components are used, then fluid delivery flexibility is improved, but component variations lead to unwanted deviations in fluid conveyance
Solution Approach 1:
The patent implements separate drive mechanisms for irrigation and aspiration pumps within the integrated assembly, allowing each pump to be optimized for its specific function while maintaining consistent manufacturing standards for shared components. This enables tailored fluid delivery characteristics for each function while ensuring reliability through standardized critical components.
Solution Approach 2:
Individual flow sensors monitor irrigation and aspiration fluid flows separately, providing function-specific feedback to the controller. This allows the system to maintain reliable and consistent fluid conveyance for each function by adjusting pump operation based on actual flow conditions, compensating for component variations.
3Device complexity
If traditional separate pump systems are used, then system simplicity is maintained, but fluid control accuracy and coordination between irrigation and aspiration deteriorate
Solution Approach 1:
The patent combines multiple pump functions into a single integrated pump assembly with shared housing, drive mechanisms, and control systems. This reduces overall system complexity compared to completely separate pump systems while improving fluid control accuracy through coordinated operation and unified manufacturing standards for critical components.
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 accurate and efficient control of fluid pressures and flows, reducing the need for identical pump components and enhancing surgical precision by compensating for manufacturing variations.
Implementation Method 1
a first pump chamber (3) with a first volume and a first drive chamber (5) with a second volume, which chambers are separated from each other by a first elastic partition element (4)
Implementation Method 2
a first pressure sensor (11) for detecting a first pressure (p1) in the first drive fluid line (7)
Implementation Method 3
a first position sensor (6) for detecting a first deflection position of the first elastic partition element (4)
Data Source
AI summary
An ophthalmic surgical system includes: a first position sensor for detecting a first deflection position of the first elastic partition element, a second position sensor for detecting a second deflection position of the second elastic partition element, a first pressure sensor for detecting a first pressure in a first drive fluid line, a second pressure sensor for detecting a second pressure at an outlet of a first pump chamber and/or a third pressure sensor for detecting a third pressure at an inlet of a second pump chamber, a fourth pressure sensor for detecting a fourth pressure in the second drive fluid line, a direct connection line configured to connect the irrigation fluid line to the aspiration fluid line, a processing unit for processing the first pressure, the second pressure and/or the third pressure, the fourth pressure, in each case dependent on the first and the second deflection position.