Vitrectomy Cutter Valve Control via Adaptive Pressure Feedback
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Solution Overview
Problem
Current vitrectomy surgical systems are limited in cutting speed and efficiency due to constant valve opening signals and variable input supply pressure, leading to suboptimal cutting performance and mechanical delays, which affect the quality and accuracy of material processing during ocular procedures.
Innovation Solution
A vitrectomy apparatus with a pressure source, cut valve, sensor, and controller that monitors pressure and aspiration rate to control the cutting device's operation, allowing for variable pressure control and optimized cutting speed based on real-time conditions, enabling higher cutting speeds and improved material processing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant valve opening signal time is used, then the cutting device operates reliably, but the cutting speed remains limited and material processing efficiency decreases
Solution Approach 1:
The patent applies dynamics by transitioning from constant valve opening timing to variable valve opening timing that adapts to different cutting speeds. The controller dynamically adjusts the valve opening signal duration based on the selected cutting speed, allowing the system to maintain reliable operation across a wide range of speeds (100-2500 CPMs) while optimizing material processing efficiency at each speed level.
Solution Approach 2:
The patent implements parameter changes by varying the valve opening signal time as a controllable parameter. Instead of using a fixed timing parameter, the system changes the valve opening duration based on the desired cutting speed, enabling flexible control over both reliability and productivity. This parameter adjustment allows the cutter to operate effectively at different speeds without compromising operational reliability.
2Productivity
If valve opening time is reduced to increase cutting speed, then productivity improves, but over-pressurizing of the handpiece occurs
Solution Approach 1:
The patent applies feedback by implementing a controller that monitors and adjusts valve opening timing based on the selected cutting speed. The controller receives input about the desired cutting speed and provides feedback-adjusted valve opening signals that prevent over-pressurizing. This closed-loop control ensures that as cutting speed increases and valve opening time decreases, the system automatically adjusts parameters to maintain safe pressure levels within the handpiece.
Solution Approach 2:
The system uses dynamics by making the valve opening timing adaptive rather than fixed. The controller dynamically adjusts the valve opening duration based on real-time operating conditions and selected cutting speed, allowing the system to increase productivity while simultaneously managing pressure stress through continuous parameter optimization.
3Reliability
If excess pressure is provided to compensate for mechanical delays, then cutting reliability improves, but energy consumption increases and cutting precision decreases
Solution Approach 1:
The patent implements parameter changes by adjusting the valve opening signal timing to precisely match the mechanical response characteristics of the cutting device. Instead of applying excess pressure as a crude compensation method, the system changes the temporal parameters of valve actuation to account for mechanical delays. This results in more efficient energy use while maintaining cutting reliability, as pressure is applied only when needed rather than continuously or in excess.
4Ease of operation
If scheduled timing control is used, then the cutting device operates systematically, but the amount of material cut varies and precision decreases
Solution Approach 1:
The patent applies feedback by using a controller that adjusts valve opening timing based on the selected cutting speed and encountered pressure conditions. This feedback mechanism allows the system to maintain systematic operation while improving material cut precision. The controller monitors actual operating conditions and adjusts timing parameters accordingly, ensuring consistent and accurate material processing across different cutting speeds rather than relying on fixed scheduled timing.
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 achieves enhanced cutting speed, accuracy, and control, allowing for more efficient and precise vitreous material removal during surgical procedures, addressing the limitations of existing systems by providing closed-loop feedback and adaptive pressure control.
Implementation Method 1
a pressure source, a cut valve connected to the pressure source, the cut valve configured to be turned on and off to provide pressure to selectively extend and retract a vitrectomy cutting device
Implementation Method 2
a sensor configured to sense pressure provided from the cut valve, and a controller configured to control operation of the cut valve based on pressure sensed by the sensor
Data Source
AI summary
A vitrectomy apparatus is provided, including a pressure source, a cut valve connected to the pressure source, the cut valve configured to be turned on and off to provide pressure to selectively extend and retract a vitrectomy cutting device, a sensor configured to sense pressure provided from the cut valve, and a controller configured to control operation of the cut valve based on pressure sensed by the sensor. The controller is configured to monitor an amount of dwell time the vitrectomy cutting device remains open and monitor aspiration rate, and control a rate of material processed by the vitrectomy cutting device based on amount of dwell time and aspiration rate.