Capillary Microchannel Valve for Miniaturized Liquid Medication Dosing
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Solution Overview
Problem
Existing liquid medication administration devices face challenges in miniaturization due to the limitations of conventional mechanical inlet and outlet valves, which cannot be made smaller indefinitely.
Innovation Solution
A valve design utilizing capillary forces through microchannels and a valve body with parallel side walls, featuring a grid of rod-shaped boundary elements, allows for compact and efficient liquid flow control without traditional valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional mechanical valves are used for controlling liquid flow in a medication administration device, then the device can effectively control medication flow, but the device size increases and cannot be miniaturized further
Solution Approach 1:
The patent replaces conventional mechanical valves with a capillary-based flow control system. The microchannels utilize capillary forces to control liquid medication flow without moving mechanical parts, enabling device miniaturization while maintaining flow control functionality. The capillary forces naturally regulate flow based on channel geometry and liquid properties, eliminating the need for mechanical actuation components.
Solution Approach 2:
The invention employs microstructured porous elements with specific pore sizes and geometries to control liquid flow. The porous structure creates capillary pressure differences that regulate medication flow through the device. By designing pores with specific dimensions and arrangements, the system achieves reliable flow control at micro-scale dimensions, resolving the contradiction between small size and effective flow management.
2Volume of moving object
If the device is miniaturized to reduce space requirements, then portability improves, but conventional mechanical valves cannot be made smaller indefinitely
Solution Approach 1:
By replacing mechanical valves with capillary-based flow control structures, the patent eliminates complex mechanical assembly requirements. The capillary channels can be fabricated using standard microfabrication techniques such as photolithography, etching, and molding, which are well-established in the semiconductor and microfluidics industries. This substitution dramatically simplifies the manufacturing process while enabling extreme miniaturization.
Solution Approach 2:
The invention controls flow characteristics by adjusting geometric parameters of the microchannels (width, height, length, curvature) rather than using mechanical valve adjustments. These dimensional parameters can be precisely controlled during manufacturing processes, allowing for scalable production of miniaturized devices with tailored flow properties through parameter optimization rather than complex mechanical design.
3Area of stationary object
If microchannels with small cross-sections are used, then device compactness improves, but capillary forces must be precisely controlled for effective flow management
Solution Approach 1:
The patent utilizes the relationship between capillary pressure and channel dimensions to control flow. By carefully selecting and optimizing the geometric parameters of the microchannels (cross-sectional area, aspect ratio, length), the system achieves desired flow control characteristics. The capillary pressure is directly related to the channel dimensions through the Young-Laplace equation, allowing precise flow regulation through geometric design rather than complex mechanical control mechanisms.
Solution Approach 2:
The microchannel system utilizes the inherent capillary properties of the liquid-medication interface to self-regulate flow without external control mechanisms. The capillary forces automatically adjust flow rates based on the liquid's wetting properties and channel geometry, creating a self-regulating system that is tolerant of reasonable manufacturing variations. This self-service approach reduces the stringency of manufacturing precision requirements while maintaining effective flow control.
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 a compact and easily manufacturable valve system that effectively administers liquid medication with minimal space requirements, utilizing capillary effects for fluid flow management.
Implementation Method 1
The valve according to the invention makes use of the capillary effect. It is known that liquids can wet surfaces and move through complex structures due to capillary forces.
Data Source
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AI summary
The invention relates to a valve, in particular for a device for administering a liquid medication, comprising a valve body (1) having an interior (2) for receiving a liquid (20), wherein the valve body (1) has a liquid inlet (3) and a corresponding liquid outlet (4), both of which open into the interior (2), wherein a plurality of microchannels (5) are arranged in the interior (2), extending in the connecting direction (x) between the liquid inlet (3) and the liquid outlet (4). A corresponding device for administering a liquid medication is further described.