SMA Membrane Valve Actuation for Precise Flow Cell Dispensing
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Solution Overview
Problem
Existing fluidic systems used in conjunction with fluidic cartridges and flow cells face challenges in accurately and precisely controlling the flow of reagents due to limitations in actuation technology, leading to inefficiencies and increased consumable usage.
Innovation Solution
The implementation of shape memory alloy (SMA) actuator systems, which include a housing with SMA actuators positioned between a printed circuit board and an end plate, allowing for precise control of membrane valves through voltage application, thereby managing the flow of reagents effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional actuation technology is used in fluidic systems, then the system structure is simpler, but the flow control precision and accuracy deteriorate
Solution Approach 1:
The patent replaces conventional mechanical actuators with shape memory alloy (SMA) actuators that utilize thermal-mechanical coupling effects. The SMA actuators convert electrical energy to thermal energy, which then induces dimensional changes in the alloy wires, achieving precise flow control through a non-mechanical actuation mechanism that reduces moving parts and improves precision.
Solution Approach 2:
The patent utilizes the temperature-dependent dimensional changes of shape memory alloy wires to control fluid flow. By changing the temperature of the SMA wires through electrical heating, the actuator rod position changes, thereby precisely controlling the membrane valve position and achieving accurate flow control through parameter (temperature) changes rather than mechanical displacement.
2Manufacturing precision
If conventional actuators are used, then the device structure is simpler, but the dispensing precision of small volumes deteriorates
Solution Approach 1:
The patent replaces conventional mechanical actuators with shape memory alloy (SMA) actuators that utilize thermal-mechanical coupling effects. The SMA actuators convert electrical energy to thermal energy, which then induces dimensional changes in the alloy wires, achieving precise flow control through a non-mechanical actuation mechanism that reduces moving parts and improves precision.
Solution Approach 2:
The patent employs a membrane valve with a flexible membrane that is actuated by the SMA actuator. The membrane's flexibility allows for precise control of small fluid volumes, as the thin film can respond sensitively to the dimensional changes in the SMA actuator rod, enabling accurate dispensing of small volumes.
3Productivity
If traditional fluidic systems are used, then the system is easier to operate, but the cycle times are longer
Solution Approach 1:
The patent utilizes the rapid thermal response characteristics of shape memory alloy wires to achieve fast, periodic actuation cycles. The SMA actuators can be quickly heated and cooled, enabling rapid opening and closing of the membrane valve, thereby significantly reducing cycle times and improving productivity through fast, repeatable periodic action.
Solution Approach 2:
The patent exploits the phase transition properties of shape memory alloys, which undergo rapid austenite-martensite phase transformations when heated or cooled. This phase transition enables the actuator to quickly change dimensions and rapidly actuate the membrane valve, achieving fast cycle times through controlled phase transitions rather than slow mechanical movement.
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 SMA actuator system enables precise and accurate dispensing of small volumes of fluids, reduces dead volume within the fluidic network, and shortens cycle times, ultimately leading to more efficient use of reagents and reduced operational costs.
Implementation Method 1
Applying a voltage to the shape memory alloy wire retracts the shape memory alloy wire
Implementation Method 2
shape memory alloy actuator including a pair of shape memory alloy wires
Data Source
AI summary
Actuation systems and methods are disclosed. An apparatus includes a system including a flow cell receptacle and a valve drive assembly including a shape memory alloy actuator including a pair of shape memory alloy wires and a flow cell disposable within the flow cell receptacle and having a membrane valve. The system actuates the membrane valve, via the shape memory alloy actuator, by causing a voltage to be applied to a first one of the shape memory alloy wires and the system not applying the voltage to a second one of the shape memory alloy wires.