Progressing Cavity Pump Aspiration for Phacoemulsification Surge Control
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Solution Overview
Problem
Current surgical systems for phacoemulsification face challenges in controlling vacuum levels, leading to severe eye trauma due to occlusions and pulsating flow rates, which increase surgical difficulty and decrease patient safety.
Innovation Solution
A progressing cavity pump is integrated into the phacoemulsification handpiece, providing a more controllable and consistent fluid flow by using a stator with circumferential cavities and a rotor-driven pumping mechanism, eliminating post-occlusion surge and pulsation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a vacuum-based aspiration pump is used to achieve high fluid flow rate, then productivity is improved, but reliability deteriorates due to uncontrollable vacuum levels causing eye trauma
Solution Approach 1:
The patent replaces the traditional vacuum-based mechanical aspiration system with a positive displacement pump system that uses mechanical volumetric flow control. This substitution eliminates the uncontrollable vacuum levels inherent in vacuum-based systems while maintaining high fluid flow rates through precise mechanical control of pump displacement and speed.
Solution Approach 2:
The patent changes the fundamental operating parameter from vacuum pressure control to volumetric flow control. By using a positive displacement pump with adjustable stroke volume and speed, the system achieves high fluid flow rates through parameter adjustment of pump displacement rather than through vacuum pressure, thereby eliminating the reliability issue of uncontrollable vacuum levels.
2Ease of operation
If manual adjustment of vacuum level is used to control flow rate, then ease of operation is improved, but manufacturing precision deteriorates due to inability to maintain consistent flow rates
Solution Approach 1:
The patent incorporates flow sensors and control systems that continuously monitor actual fluid flow rates and provide feedback to the pump control mechanism. This closed-loop feedback system automatically adjusts pump operation to maintain precise, consistent flow rates regardless of variations in surgical conditions, occlusions, or irrigation pressure changes.
Solution Approach 2:
The patent replaces manual vacuum adjustment with an electronically controlled positive displacement pump system that uses programmable logic and sensors to automatically maintain precise flow rates. This mechanical-electronic substitution eliminates the imprecision of manual adjustment while maintaining ease of operation through automated control.
3Productivity
If vacuum-based pump is used during occlusion, then productivity is maintained, but object-affected harmful factors increase due to post-occlusion surge causing eye trauma
Solution Approach 1:
The patent applies preliminary anti-action by using a positive displacement pump that inherently prevents vacuum buildup before occlusion occurs. The pump's fixed displacement mechanism ensures that aspiration flow is limited to the actual emulsified material being produced, preventing the vacuum surge that occurs in vacuum-based systems when occlusions clear. This preliminary prevention eliminates the harmful post-occlusion surge effect.
Solution Approach 2:
The patent changes the aspiration mechanism from vacuum pressure-driven to positive displacement volumetric flow-driven. This parameter change ensures that during occlusion, the pump simply stops aspirating when material flow stops, rather than building dangerous vacuum levels. The harmful effect is eliminated by changing the fundamental operating parameter from pressure to volumetric flow control.
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 higher degree of accuracy in flow rates and significantly reduces the risk of severe eye trauma by maintaining consistent fluid flow during occlusions, enhancing both surgical precision and patient safety.
Implementation Method 1
a progressing cavity pump aspirator in fluidic communication with an aspiration port and capable of aspirating the emulsified material (and irrigation fluid) to the material collection point through the aspiration connection. The pump may include: a stator having a plurality of at least substantially circumferential cavities; and a rotor associated with the stator to effectuate pumping via the at least substantially circumferential cavities of the emulsified material from the aspiration port to the aspiration connection.
Data Source
AI summary
An apparatus, system and method for providing a surgical handpiece. The apparatus, system and method may include: a proximal segment and a distal segment. The distal segment may include: an emulsifying tip; an irrigation output in fluidic communication with the irrigation input, and capable of supplying irrigating fluid to a surgical site; and a progressing cavity pump aspirator in fluidic communication with an aspiration port and capable of aspirating the emulsified material to the material collection point through the aspiration connection. The pump may include: a stator; and a rotor rotationally associated with the stator to effectuate pumping, via the stator cavities, of the emulsified material from the aspiration port in the distal segment through the proximal section.