Phaco Probe Bypass Valve Control for Vacuum Surge Stability
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Solution Overview
Problem
Existing phacoemulsification systems face challenges in managing vacuum surges and pressure fluctuations during cataract surgery, which can lead to potential eye trauma due to uncontrolled fluid diversion and pressure changes.
Innovation Solution
A processor-controlled three-way rotatable valve system is integrated into the phacoemulsification probe, allowing adaptive control of fluid communication between irrigation and aspiration channels, using sensors to maintain pressure and vacuum levels within specified limits, reducing the risk of vacuum surges and pressure fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a bypass channel is opened to control vacuum surge, then vacuum level stability is improved, but fluid flow control precision deteriorates
Solution Approach 1:
The bypass channel includes a movable barrier that can dynamically adjust its position to control the bypass opening area. This dynamic adjustment mechanism allows the system to maintain vacuum stability by opening the bypass when needed while preserving precise fluid flow control by closing or restricting the bypass during normal operation, thus resolving the contradiction between stability and precision.
2Reliability
If rapid valve response is implemented to prevent eye trauma, then safety is improved, but device complexity increases
Solution Approach 1:
The system includes a vacuum sensor that continuously monitors vacuum levels and triggers the bypass channel to open before dangerous vacuum surges can occur. This preliminary protective action prevents eye trauma by anticipating and counteracting potential hazards before they materialize, thereby improving safety without requiring complex real-time response mechanisms.
Solution Approach 2:
The control system uses feedback from vacuum sensors to automatically adjust the bypass channel opening based on real-time vacuum conditions. When vacuum levels approach dangerous thresholds, the feedback mechanism triggers the bypass to open, creating a self-regulating safety system that improves reliability while maintaining relatively simple device architecture through automated control.
3Stability of the object's composition
If bypass opening area is increased to reduce vacuum surge, then vacuum control is improved, but aspiration flow rate decreases
Solution Approach 1:
The movable barrier in the bypass channel enables dynamic adjustment of the bypass opening area based on real-time vacuum conditions. When vacuum surge is detected, the barrier moves to increase the bypass opening area to reduce the surge. When normal operation is restored, the barrier returns to its original position to minimize bypass flow and maintain high aspiration flow rate, thus resolving the contradiction between vacuum control and productivity.
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 provides rapid response times to adjust fluid flow, minimizing the risk of eye trauma by controlling fluid pressures and vacuums, ensuring safe and efficient phacoemulsification procedures.
Implementation Method 1
The tip of the needle vibrates at ultrasonic frequency to sculpt and emulsify the cataract
Implementation Method 2
The tip of the needle vibrates at ultrasonic frequency to sculpt and emulsify the cataract
Implementation Method 3
a pump aspirates particles and fluid from the eye through the tip
Implementation Method 4
a valve having a movable barrier that adjusts a bypass opening area in the bypass channel as a function of a pressure differential across the valve
Data Source
Figure 1
Figure 2A~2C
Figure 3A~3B
AI summary
A phacoemulsification system includes a phacoemulsification probe and a processor. The phacoemulsification probe includes (a) a needle configured for insertion into a lens capsule of an eye, and to be vibrated to emulsify a lens of the eye, (b) an irrigation channel for flowing irrigation fluid into the lens capsule, (c) an aspiration channel for removing material from the lens capsule, (d) a bypass channel fluidly coupled with the irrigation channel and with the aspiration channel, (e) a processor-controlled valve configured to control a level of fluid communication between the irrigation channel and the aspiration channel via the bypass channel, and (f) one or more sensors configured to measure fluid pressure at a distal portion of one or both of the irrigation channel and the aspiration channel. The processor is configured to adaptively adjust the valve based on the fluid pressure measured by the one or more sensors.