Surgical cassette
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Solution Overview
Problem
Current surgical fluid management systems for eye treatments, such as phacoemulsification, face challenges in accurately controlling fluid volume and pressure during cataract surgery, leading to potential tissue damage from excessive or insufficient fluid levels, and varying control due to the limitations of positive displacement and vacuum-based aspiration systems.
Innovation Solution
A surgical cassette with a gasket and valves, integrated with a console and handpiece, that includes a deformable gasket with sensors and a clamping mechanism for precise fluid flow control, capable of working with both peristaltic and vacuum-based aspiration systems, ensuring consistent fluid pressure and volume management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If peristaltic pumps are used for aspiration flow, then accurate control over flow volume is achieved, but pressure control becomes less accurate and vacuum variations occur
Solution Approach 1:
The patent combines both peristaltic pump mechanisms and vacuum-based aspiration systems into a single integrated surgical cassette. This merging allows the system to leverage the flow volume control accuracy of peristaltic pumps while incorporating vacuum sources for improved pressure control, thereby resolving the contradiction between flow volume precision and pressure stability.
Solution Approach 2:
The cassette is designed with dynamic adaptability, allowing switching between peristaltic pump-driven flow and vacuum-based aspiration. This dynamic configuration enables the system to adjust its operational mode based on procedural requirements, optimizing both flow volume control and pressure management throughout the surgical procedure.
2Stress or pressure
If vacuum-based aspiration systems are used, then accurate control over fluid pressure is achieved, but excessive fluid flows occur and pressure surges happen during occlusion
Solution Approach 1:
The system incorporates sensors that provide feedback on fluid flow and pressure conditions. This feedback mechanism allows the control system to monitor and adjust vacuum application in real-time, preventing excessive fluid flows and pressure surges during probe occlusion by modulating the vacuum source output based on actual system conditions.
Solution Approach 2:
The vacuum-based system is designed with dynamic control capabilities, allowing the vacuum source to be adjusted or deactivated during probe occlusion events. This dynamic response prevents pressure surges and excessive fluid aspiration by adapting the vacuum application to the current surgical conditions.
3Device complexity
If a single type of cassette is used for all procedures, then device simplicity is maintained, but adaptability to different aspiration methods is limited
Solution Approach 1:
The surgical cassette is designed as a universal platform that can accommodate both peristaltic pump-based aspiration and vacuum-based aspiration systems. By integrating multiple aspiration mechanisms and configuring the fluidic pathways to support different operational modes, the single cassette design achieves versatility across different surgical procedures and aspiration methods without requiring multiple specialized cassettes.
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 provides improved control over fluid flow and pressure, reducing the risk of tissue damage by maintaining optimal fluid levels within the eye, enhancing surgical precision and safety through the integration of sensors and a clamping mechanism that adapts to different aspiration methods.
Implementation Method 1
peristaltic pumps (which use rotating rollers that press against a flexible tubing to induce flow)
Implementation Method 2
vacuum-based aspiration systems using a vacuum source, typically applied to the aspiration flow through an air-liquid interface
Data Source
AI summary
A surgical cassette for use with a phacoemulsification system having a front plate, a back plate, and a gasket therebetween. The front plate having molded fluid channels that mate with the gasket. The gasket having multiple valves and a sensor or diaphragm accessible through the back plate.