Membrane Pump with Auxiliary Chamber for Ophthalmic Surgery
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Solution Overview
Problem
Current irrigation/aspiration systems for ophthalmic surgery face challenges in maintaining precise flow control and quick response times, particularly in switching between pressure and flow controlled modes, due to the complexity and bulkiness of dual pump systems.
Innovation Solution
The system employs a membrane pump with a main pump chamber and an auxiliary pump chamber to compensate for pulsating movements, allowing for smooth fluid flow and enabling operation in both pressure and flow controlled modes with a single pump, using a control unit to adjust plunger and valve movements for optimal control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a pressure controlled pump is used, then quick response time is achieved, but flow control precision deteriorates
Solution Approach 1:
The pump system is divided into two independent pump chambers (first pump chamber and second pump chamber) that operate in parallel. Each chamber can independently control flow, allowing the system to achieve both quick response (through pressure control capabilities) and precise flow control (through combined output of both chambers)
Solution Approach 2:
The patent combines the advantages of pressure-controlled and flow-controlled pumps into a single unified system. By merging two pump chambers with different control characteristics, the system achieves both quick response time and precise flow control simultaneously
2Stability of the object's composition
If a flow controlled pump is used, then stable flow rate is achieved, but response time deteriorates
Solution Approach 1:
The pump system is divided into two independent pump chambers (first pump chamber and second pump chamber) that operate in parallel. Each chamber can independently control flow, allowing the system to achieve both quick response (through pressure control capabilities) and precise flow control (through combined output of both chambers)
Solution Approach 2:
The patent combines the advantages of pressure-controlled and flow-controlled pumps into a single unified system. By merging two pump chambers with different control characteristics, the system achieves both quick response time and precise flow control simultaneously
3Adaptability or versatility
If a combined system with both pressure controlled pump and flow controlled pump is used, then both control modes are available, but device complexity increases
Solution Approach 1:
The patent integrates both pressure-controlled and flow-controlled pump functionalities into a single unified pump system with two chambers. This merging approach provides both control modes without requiring completely separate pump systems, thereby reducing overall device complexity while maintaining versatility
Solution Approach 2:
The unified pump system is designed to perform multiple functions - it can operate in pressure-controlled mode, flow-controlled mode, or a combination of both. This multi-functionality eliminates the need for separate dedicated pumps for each control mode, simplifying the overall system architecture
4Stability of the object's composition
If a peristaltic pump is used, then flow stability independent of viscosity is achieved, but flow pulsation increases
Solution Approach 1:
The pump system divides the pumping function into two separate pump chambers that operate in parallel. By segmenting the flow output, the system can compensate for pulsations from individual chambers, producing a more stable combined flow output while maintaining viscosity-independent operation
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 configuration provides stable, viscosity-independent flow with quick response times and simplified mode switching, reducing the need for complex dual pump systems and enhancing operational accuracy and safety during surgical procedures.
Implementation Method 1
an auxiliary pump chamber (6) arranged between the main pump chamber (2) and the surgical site, the auxiliary pump chamber (6) being adapted to compensate for a pulsating movement of the main pump plunger element (3)
Data Source
AI summary
A surgical cartridge includes an inner plate; and an outer plate arranged approximately parallel to the inner plate. The flow paths between the inner plate and the outer plate are arranged to form an irrigation flow path for directing fluid towards the surgical site via an irrigation connection and an aspiration flow path for directing fluid away from the surgical site via an aspiration connection. The inner plate includes membranes adapted for cooperation with plungers and/or valves of a membrane pump. The membranes include a main membrane, at least two valve membranes and an auxiliary membrane adapted to cooperate with a main membrane plunger, valve and an auxiliary membrane plunger of the pump, respectively.