Ophthalmic Compressed Air Pulse Control via Dynamic Pressure Feedback
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Solution Overview
Problem
Existing ophthalmological instruments, such as vitrectors, experience malfunctions or total failure due to fluctuations in system pressure and reaching the performance limit of the compressed air generator, which requires a constant control pressure for error-free operation.
Innovation Solution
A control method that measures the system pressure using a pressure sensor and dynamically adjusts the control signal for the valve, taking into account the measured pressure, especially at high compressed air pulse rates, to ensure reliable operation even when system pressure fluctuates or exceeds the compressor's performance limit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the compressed air generator operates at high pulse rates, then the productivity of the ophthalmological instrument is improved, but the system pressure fluctuates and reaches the performance limit causing malfunctions
Solution Approach 1:
The control signal is dynamically adjusted based on the measured system pressure. The control device modifies the valve actuation timing and duration in real-time according to pressure fluctuations, allowing the system to maintain reliable operation across varying pulse rates from a few Hertz to several kilohertz without fixed control parameters
Solution Approach 2:
A pressure sensor continuously monitors the system pressure and feeds this information back to the control device. The control device uses this feedback to adaptively adjust the control signal for the valve, ensuring stable instrument operation even when the compressed air generator reaches its performance limit at high pulse rates
2Device complexity
If fixed control signals are used for different pulse rates, then the device complexity is reduced, but the instrument fails when system pressure fluctuates
Solution Approach 1:
The system implements feedback control where the pressure sensor monitors system pressure and the control device adjusts the control signal accordingly. This replaces fixed control signals with adaptive control that responds to real-time pressure conditions, preventing instrument failure while maintaining reasonable device complexity
Solution Approach 2:
The control parameters (valve actuation timing and duration) are changed dynamically based on the measured system pressure. Instead of using fixed control signals for different pulse rates, the system continuously adapts control parameters to maintain optimal operation across varying pressure conditions
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 reliable functioning of ophthalmological instruments by compensating for pressure disturbances and operating above the compressor's performance limit, maintaining consistent cutting rates and preventing instrument failure.
Implementation Method 1
the prevailing system pressure is measured with a pressure sensor
Implementation Method 2
a pressure system being pressurized via a compressed air generator
Implementation Method 3
a valve of the pressure system being actuated by a control device by means of a control signal in order to generate the compressed air pulses
Data Source
Figure 1
Figure 2
AI summary
A control method for a device for providing compressed-air pulses for an ophthalmological instrument (3), wherein pressure is applied to a pressure system (2) by means of a compressed-air generator (1) and wherein a valve (4) of the pressure system (2) is actuated by a control unit (5) by means of a control signal (6) to generate the compressed-air pulses, is characterised in that the prevailing system pressure is measured using a pressure sensor (7) and in that at least for the generation of compressed-air pulse rates of a particular value range, the control signal (6) is generated by the control unit (5) under consideration of the measured value (8) of the system pressure. The invention also describes a device for providing compressed-air pulses.