Microfluidic Dispensing Device Sequential Activation Circuit
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Solution Overview
Problem
Existing miniaturized dispensing apparatus for inhalable substances require a large number of chambers and complex, expensive driver systems to generate sufficient vapor plumes, making them costly and difficult to integrate in low-cost applications.
Innovation Solution
A microfluidic dispensing device with a sequence of chambers, each with an actuator and drop emission detection element, utilizing a sequential activation electric circuit that allows a single initial signal to activate all chambers automatically, reducing the need for complex driver systems and minimizing integration area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a large number of chambers are used to generate sufficient vapor plumes, then the vapor generation capability is improved, but the device complexity and driver system cost increase
Solution Approach 1:
Multiple chamber activation functions are merged into a single sequential activation circuit that automatically triggers all chambers in sequence. The circuit integrates the actuation logic for all chambers, eliminating the need for separate driver control for each chamber and reducing overall system complexity while maintaining the capability to activate many chambers.
Solution Approach 2:
The sequential activation circuit is self-triggering, where each chamber's activation automatically initiates the next chamber's activation without external intervention. The system serves itself by using the activation of one chamber to trigger the subsequent chamber, eliminating the need for complex external driver control.
2Quantity of substance
If a large number of chambers are used to generate sufficient vapor plumes, then the vapor generation capability is improved, but the integration area increases
Solution Approach 1:
The control functions for multiple chambers are merged into a single sequential activation circuit, reducing the integration area required for driver systems. Instead of having separate control electronics for each chamber, the merged circuit occupies minimal space while managing all chamber activations.
Solution Approach 2:
The vapor generation function is segmented across multiple small chambers arranged in sequence, allowing the vapor plume generation capability to be distributed over a compact area. Each chamber contributes to the overall vapor output, enabling sufficient vapor quantity without requiring a large integration area for a single large chamber or complex driver system.
3Manufacturing precision
If complex driver systems are used to control multiple chambers, then the control precision is improved, but the manufacturing cost increases
Solution Approach 1:
The sequential activation circuit operates autonomously, with each chamber's activation automatically triggering the next chamber. This self-service mechanism maintains precise control over the dispensing sequence without requiring expensive complex driver systems, thereby reducing manufacturing costs while preserving control precision.
Solution Approach 2:
The sequential activation circuit uses simple, inexpensive electronic components rather than complex driver systems. The design prioritizes cost-effective implementation with basic circuit elements that can precisely control the timing and sequence of chamber activations without requiring expensive specialized electronics.
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 enables efficient and cost-effective generation of vapor plumes with reduced complexity and integration area, making it suitable for low-cost applications and portable devices.
Implementation Method 1
A heater is formed here within the insulating layer 21 below the chamber 30. The heater 33 may be formed, in a non-limiting manner, of polycrystalline silicon, Al, Pt, TiN, TiAIN, TaSiN, TiW. In use, the ASIC 6 (FIG. 1) generates electrical signals supplied to the heaters 33 of the chambers 30 through the connection lines 15, allowing the heaters 33 to heat up to a programmed temperature, for example 450° C.
Implementation Method 2
The liquid present in the chambers 30, coming from the tank 17 (FIG. 1) through the supply passages 26 (FIG. 2A), is then rapidly heated and forms vapor bubbles such to push a drop of liquid through each nozzle 32.
Data Source
AI summary
A microfluidic dispensing device has a plurality of chambers arranged in sequence, each having an inlet receiving a liquid to be dispensed and a nozzle for emitting a drop of liquid. An actuator in each chamber receives an actuation quantity and causes a drop of liquid to be emitted by the nozzle of the respective chamber. A drop emission detection element in each chamber generates an actuation command upon detecting the emission of a drop of liquid. A sequential activation electric circuit includes a plurality of sequential activation elements, one for each chamber, each coupled to the drop emission detection element of the respective chamber and to an actuator associated with a subsequent chamber in the sequence of chambers. Each sequential activation element receives the actuation command from the drop emission detection element associated with the respective chamber and activates the actuator associated with the subsequent chamber in the sequence of chambers.