Vitrectomy Apparatus Dynamic Valve Control
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Solution Overview
Problem
Current vitrectomy surgical systems are limited in cutting speed and efficiency due to constant valve opening times and variable input supply pressure, leading to suboptimal cutting performance and material processing during ocular procedures.
Innovation Solution
A vitrectomy apparatus with a pressure source, cut valve, sensor, and controller that dynamically adjusts pressure and cutting speed based on sensed pressure to optimize cutting efficiency and accuracy, enabling higher cutting speeds and precise control of the cutting device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If constant valve opening time is used, then system simplicity is maintained, but cutting speed and efficiency are limited
Solution Approach 1:
The patent applies dynamics by transitioning from constant valve opening time to dynamically adjusted valve timing. The controller modifies the valve opening time based on real-time pressure feedback from the sensor, allowing the system to adapt cutting parameters during operation. This enables cutting speeds exceeding 2500 CPM while maintaining optimal pressure control through continuous adjustment of the pneumatic valve timing.
Solution Approach 2:
The patent implements feedback control by connecting a pressure sensor to the controller, which monitors pneumatic pressure during cutting cycles. The controller uses this pressure feedback to adjust valve opening time and cutting parameters in real-time, creating a closed-loop system that optimizes cutting speed and efficiency while preventing over-pressurization.
2Productivity
If valve opening time is reduced to increase cutting speed, then productivity improves, but pressure control precision deteriorates
Solution Approach 1:
The pressure sensor provides real-time feedback on pneumatic pressure levels during rapid cutting cycles. The controller uses this feedback to precisely modulate valve opening time, ensuring that even at cutting speeds exceeding 2500 CPM, the pressure remains within optimal ranges for cut quality and cutter performance.
Solution Approach 2:
The system dynamically changes operational parameters (valve opening time, pressure levels) based on real-time conditions. By adjusting these parameters in response to pressure feedback, the system maintains precision pressure control while operating at high cutting speeds, resolving the trade-off between productivity and precision.
3Reliability
If excess pressure is provided to compensate for mechanical delays, then reliability improves, but energy efficiency deteriorates
Solution Approach 1:
The pressure sensor monitors actual pressure levels during cutting cycles, allowing the controller to provide only the necessary pressure required for reliable cutting without excessive margins. This feedback-based approach eliminates the need for excess pressure compensation while maintaining cutting reliability, thereby reducing pneumatic energy consumption.
Solution Approach 2:
The system uses real-time pressure feedback to self-regulate and compensate for mechanical delays dynamically, rather than relying on pre-programmed excess pressure margins. This allows the system to maintain reliability through adaptive control rather than energy-intensive over-pressurization.
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 speeds, improved control, and increased efficiency by using closed-loop pressure feedback to adjust cutting parameters in real-time, ensuring accurate and efficient removal of vitreous material during surgical procedures.
Implementation Method 1
pneumatic valve provide pressure forward and backward motion
Implementation Method 2
sensor configured to sense pressure provided from the cut valve
Implementation Method 3
spring return mechanism
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.