Eye Surgery Vacuum Pump Control for Altitude Variations
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Solution Overview
Problem
Ophthalmic surgical devices face limitations in maintaining a reliable vacuum range due to altitude and weather conditions, which can lead to operational hazards during eye surgery.
Innovation Solution
Incorporating pressure measurement components and a control unit that determines differential pressure between measured vacuum pressure and atmospheric pressure, with a test run mechanism to assess and regulate the vacuum pump's performance, ensuring sufficient suction force for the suction ring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vacuum pump arrangement is dimensioned with sufficient power to maintain required vacuum under normal conditions, then the vacuum reliability is improved, but the device complexity and cost increase
Solution Approach 1:
The control unit performs a test run before actual surgery to determine the differential pressure capability of the vacuum pump arrangement. This preliminary assessment allows the system to verify vacuum performance under current atmospheric conditions without requiring an oversized pump, thus maintaining reliability while avoiding unnecessary complexity.
Solution Approach 2:
The system dynamically adjusts operational parameters based on measured atmospheric pressure. By determining differential pressure (vacuum pressure relative to atmospheric pressure) and comparing it against threshold values, the control unit optimizes pump performance for current environmental conditions rather than relying on fixed oversizing margins.
2Reliability
If the vacuum pump arrangement is oversized to compensate for altitude and weather variations, then the vacuum reliability is improved, but the loss of energy increases
Solution Approach 1:
The system transitions from a static, fixed-power vacuum pump configuration to a dynamic system where the control unit continuously monitors atmospheric pressure and adjusts pump operation accordingly. The test run mechanism determines the actual differential pressure capability, allowing the pump to operate at optimal power levels for current conditions rather than running at constant high power.
Solution Approach 2:
The control unit uses feedback from atmospheric pressure measurements and test run results to regulate vacuum pump operation. By comparing measured differential pressure against threshold values and operational requirements, the system adjusts pump power consumption to match actual needs, reducing energy waste while maintaining vacuum reliability across varying altitude and weather conditions.
3Measurement precision
If a test run mechanism is implemented to assess vacuum pump performance, then the measurement precision is improved, but the loss of time increases
Solution Approach 1:
The test run is performed as a preliminary step before actual surgery begins. By completing vacuum performance assessment in advance, the system ensures that differential pressure measurements are accurate and that the vacuum pump arrangement is suitable for the intended procedure, preventing delays during the actual surgery.
Solution Approach 2:
The control unit automatically executes the test run and evaluates results without requiring manual intervention. The system self-assesses whether the measured differential pressure meets operational thresholds and can automatically indicate when vacuum performance is insufficient, reducing the time burden on surgical staff while maintaining measurement precision.
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 solution ensures a reliable vacuum range is maintained, preventing suction ring detachment from the eye during surgery by automatically adjusting and monitoring the vacuum pump's output, thereby enhancing operational safety.
Implementation Method 1
a vacuum pump arrangement for generating a vacuum serving to fix a suction ring on an eye
Implementation Method 2
determines a differential pressure between the measured vacuum pressure and an atmospheric pressure
Data Source
Figure 1
AI summary
The invention relates to a device for eye surgery comprising a vacuum pump arrangement (44, 46) for producing a vacuum for fixing a suction ring (24) to an eye, an evacuation path system (48) for transferring the vacuum to an interface connection (18) that enables the detachable connection of a suction ring apparatus (14) comprising the suction ring, and a control unit (40) for controlling the vacuum pump arrangement. According to the invention, the device comprises pressure measuring components (52, 54) for measuring at least the vacuum pressure, said control unit being designed to determine a differential pressure between the measured vacuum pressure and an atmospheric pressure. Preferably, the vacuum pump arrangement is operated under a test operation run, with maximum pump power, when the suction ring apparatus is not connected, in order to determine the best possible relative partial vacuum that can be achieved in the evacuation path system (48). In this way, it can always be determined whether the obtainable relative partial vacuum is sufficient, even when the eye surgery device is used at varying altitudes and under variable weather conditions (low pressure, high pressure).