Variable Flow Restrictor for Aspiration Surge Control
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Solution Overview
Problem
Current fluid control systems in cataract removal procedures, particularly those using vacuum-based pumps, face challenges in precisely controlling fluid flow rates due to occlusions, leading to unpredictable post-occlusion surges that can cause eye trauma, as existing methods rely on imprecise vacuum adjustments and lack reliable computer-based detection systems.
Innovation Solution
The implementation of a variable flow restrictor system with first and second pressure sensors to measure pressure differentials along the aspiration line, allowing for computer-based detection and precise control of fluid flow rates, and the use of a variable flow restrictor controllable by a computer processor to adjust the effective resistance of the fluid pathway, enabling precise control of volumetric flow rates while maintaining the range of operation for vacuum-based pumps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If vacuum-based pumps are used to aspirate fluid, then the rate of fluid flow is generally higher, but the control precision of volumetric flow rate deteriorates due to imprecise vacuum adjustments
Solution Approach 1:
A flow restrictor is introduced as an intermediary device between the vacuum pump and the aspiration port. This flow restrictor acts as a mediator that translates imprecise vacuum adjustments into precise volumetric flow rate control by creating a controlled resistance to flow, thereby enabling accurate flow measurement and control while maintaining the high flow capability of vacuum-based pumps
Solution Approach 2:
The patent replaces direct mechanical vacuum adjustment with a computer-based detection and control system that uses pressure sensors and algorithms to precisely control the volumetric flow rate. This substitution of mechanical control with electronic sensing and computational control enables precise flow rate management despite the inherent imprecision of vacuum-based pump adjustment
2Productivity
If vacuum level is adjusted to control fluid flow rate, then flow rate can be modified, but measurement precision deteriorates because current methods lack reliable computer-based detection systems
Solution Approach 1:
The patent implements a feedback system using pressure sensors that continuously monitor the pressure differential across the flow restrictor. This feedback mechanism provides real-time information about actual flow conditions and occlusion events, enabling the computer-based system to detect occlusions with high precision and adjust the vacuum level accordingly to maintain desired flow rates
Solution Approach 2:
The patent replaces imprecise mechanical vacuum gauges with electronic pressure sensors and computer-based detection algorithms. This substitution enables precise digital measurement of pressure differentials and automated detection of occlusion events, significantly improving measurement precision compared to traditional mechanical methods
3Productivity
If aspiration pump operates at high vacuum, then fluid flow rate increases, but harmful factors worsen due to unpredictable post-occlusion surges causing eye trauma
Solution Approach 1:
The feedback system continuously monitors pressure differential across the flow restrictor and detects occlusion events in real-time. When an occlusion is detected, the system immediately adjusts the vacuum level to prevent post-occlusion surges, thereby eliminating the harmful effect of eye trauma while maintaining high flow rates during normal operation
Solution Approach 2:
The system takes preliminary anti-action by detecting occlusion events before they can cause post-occlusion surges. The computer-based detection system identifies the onset of occlusion through pressure differential changes and preemptively adjusts the vacuum level to prevent the harmful surge effect from occurring, thereby protecting against eye trauma before it can happen
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 solution effectively detects occlusions and adjusts fluid flow rates to prevent post-occlusion surges, enhancing surgical safety by providing precise control over fluid dynamics and maintaining the operational range of vacuum-based pumps, thus reducing the risk of eye trauma.
Implementation Method 1
first and second pressure sensors to measure pressure differentials along the aspiration line
Implementation Method 2
variable flow restrictor controllable by a computer processor to adjust the effective resistance of the fluid pathway
Implementation Method 3
vacuum-based pumps (such as venturi, diaphragm, or rotary-vane pumps)... the fluid is essentially pulled by vacuum through the line
Data Source
AI summary
The invention is generally directed to systems and methods for fluid control, and more particularly to systems and methods for power and flow rate control for aspiration. In accordance with one embodiment, an aspiration system includes an aspiration line having distal and proximal ends and an aspiration port defined in the distal end; a fluid transport device operatively coupled to the proximal end of the aspiration line; and a flow restrictor operatively coupled to the aspiration line in between the fluid transport device and the aspiration port. To measure occlusion within the line, first and second pressure sensors are utilized, the first sensor being operatively coupled to the aspiration line between the port and the restrictor and the second sensor being operatively coupled to the aspiration line between the restrictor and the fluid transport device. The pressure differential between the two sensors can provide an indication of the onset, presence, and/or elimination of an occlusion.