Pneumatic Microfluidic Logic Circuit for Autonomous Fluid Handling
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Solution Overview
Problem
Existing microfluidic devices require off-chip controls, which are cumbersome, costly, and unreliable, limiting their use due to the need for external machinery to manage fluid handling operations.
Innovation Solution
A pneumatic device implementing a finite state machine with a programmable logic array (PLA) and elastomeric membrane, allowing for onboard control of fluid handling operations, including metering, mixing, and dilution, using a system clock and pneumatic valves to perform serial dilution without external control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If off-chip controls are used to manage fluid handling operations, then the microfluidic device can perform complex laboratory assays, but the device becomes cumbersome, costly, and unreliable due to the need for external machinery
Solution Approach 1:
The patent merges the control functions previously located off-chip with the microfluidic chip itself by integrating digital logic circuits, state registers, and pneumatic valve arrays directly onto the chip substrate. This integration eliminates the need for external control machinery while maintaining the capability to perform complex fluid handling operations, thereby reducing device complexity without sacrificing adaptability
Solution Approach 2:
The microfluidic device becomes self-contained by incorporating autonomous control circuits that can execute programmed operations without external intervention. The onboard digital logic circuits and state registers enable the device to control its own fluid handling operations, eliminating dependence on off-chip control systems and improving reliability
2Ease of operation
If off-chip controls are used to activate valves and pumps, then fluid handling operations can be executed, but the size and cost of the system increase significantly
Solution Approach 1:
The control circuits, including digital logic gates and state registers, are integrated directly onto the microfluidic chip substrate, merging what were previously separate off-chip components into a single compact unit. This integration dramatically reduces the size and weight of the overall system while maintaining full automation capability for fluid handling operations
3Manufacturing precision
If off-chip controls are used to manage microfluidic operations, then precise fluid control is achieved, but the reliability decreases due to numerous connection points and external machinery
Solution Approach 1:
Integrating the control circuits directly onto the chip substrate eliminates numerous external connections and interfaces between off-chip components. This reduction in connection points minimizes potential failure modes while maintaining precise fluid control capability, thereby improving overall system reliability
Solution Approach 2:
The self-contained architecture with onboard control circuits reduces dependence on external machinery and connections, making the system more robust and reliable. The integrated design ensures that precise fluid control is achieved through internal circuits that are inherently more reliable than external control systems with multiple connection points
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
Enables self-contained, reliable, and cost-effective microfluidic systems that can execute programmed operations autonomously, reducing the need for off-chip controls and enhancing ease of use and reliability.
Implementation Method 1
pneumatic device implementing a finite state machine
Implementation Method 2
The pneumatic device is composed of an elastomeric membrane disposed between two channel layers
Data Source
AI summary
Pneumatic devices for implementing finite state machines are provided. In some implementations, the pneumatic device comprises a state register component configured to hold one of a set of possible states. The pneumatic device also comprises a next-state logic block component configured to determine a next state for the state register component based at least in part on a current state of the state register component. A pneumatic programmable logic array (PLA) implementing a next state logic block of a finite state machine is also provided. The pneumatic PLA comprises an elastomeric membrane containing a pattern of holes and disposed between two channel layers of a pneumatic device. The PLA receives one or more input values representing a current state of a state register and one or more input values representing a user input and calculates one or more output values representing a next state for the state register.