Pneumatic Manifold Flow Control for Fluid Analysis
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Solution Overview
Problem
Existing pneumatic systems for fluid analyzers in mechanical ventilators and anesthesia machines face issues with leakage, complexity in assembly, increased rise and fall times, and inadequate flow control due to numerous connections and external buffer volumes, which fail to regulate fluid flow accurately during dynamic pressure changes in breathing cycles.
Innovation Solution
A pneumatic manifold system with a connection interface for a fluid analyzer and pump unit, incorporating a buffer volume and control unit that adjusts pump stroke force and frequency based on flow and pressure sensor measurements to maintain constant flow during breath cycles, reducing ripple and improving regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple valves, pumps, sensors and measuring cells are connected by metal or plastic tubes and connectors, then the system can be assembled with standard components, but the number of connection points increases leakage risks and system complexity
Solution Approach 1:
The patent integrates multiple previously separate components (valves, pumps, sensors, measuring cells) into a single integrated manifold structure. This merging eliminates numerous tube connections and connectors, thereby reducing leakage risks while maintaining the functionality of all individual components. The manifold serves as a common fluid distribution system that replaces the traditional point-to-point connection architecture.
2Ease of manufacture
If multiple tubes and connectors are used to connect system components, then the system can be built with modular parts, but the assembly becomes very complex and increases production costs
Solution Approach 1:
The patent combines multiple discrete components into an integrated manifold assembly, reducing the number of individual parts and connection points. This integration simplifies the assembly process by eliminating the need to connect numerous separate components with tubes and connectors, thereby reducing assembly complexity and production costs while maintaining modular design benefits.
Solution Approach 2:
The manifold serves multiple functions simultaneously: it acts as a fluid distribution system, houses multiple valves and sensors, provides structural support, and enables compact arrangement of components. This multi-functionality reduces the overall system complexity by consolidating what would otherwise require separate components and assemblies.
3Ease of manufacture
If multiple connections and components are used in the fluid path, then the system can be built with standard parts, but dead space and dimension changes increase system delay and rise/fall times
Solution Approach 1:
The integrated manifold design consolidates fluid pathways into a unified structure, eliminating dead spaces that would exist at multiple tube connections and component interfaces. This merging of fluid paths reduces the total volume of stagnant fluid and minimizes dimension changes, thereby decreasing system delay and improving rise and fall times while still using standard manufacturing techniques.
4Stability of the object's composition
If external buffer volumes are used outside the manifold to obtain ripple-free fluid flow, then flow stability may be improved, but the system size increases and control response becomes slower
Solution Approach 1:
The patent integrates the buffer volume function directly into the manifold structure rather than using separate external buffer volumes. This integration achieves the desired flow stability and ripple reduction while minimizing the overall system volume. The manifold's internal geometry is designed to provide damping and flow stabilization without requiring additional external components.
5Productivity
If piston pump or voice coil pump is used to create sampling flow, then gas sample can be drawn from breathing circuit, but pressure variations during breath cycle cause inconsistent flow and sampling volume
Solution Approach 1:
The patent incorporates pressure sensors that continuously monitor the breathing circuit pressure and provide feedback to the control system. Based on this real-time pressure information, the control system dynamically adjusts the pump operation (either piston or voice coil) to compensate for pressure variations during the breath cycle, thereby maintaining consistent sampling flow and volume despite changing respiratory pressures.
Solution Approach 2:
The patent implements dynamic pump control that adapts to changing breath cycle conditions. The pump operating parameters (frequency, amplitude, or voltage) are continuously adjusted based on real-time pressure measurements, transforming the static pump operation into a dynamic system that maintains optimal performance throughout the variable breath cycle.
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 system enhances rise and fall times, reduces leakage, and provides precise flow control during dynamic pressure changes, making it more efficient and easier to produce and service, while minimizing external volumes and noise.
Implementation Method 1
a control unit for calculating a pump stroke force and/or pump frequency based on measurements from the flow sensor and/or the pressure sensor for obtaining a constant flow through the pneumatic system during a breath cycle with dynamic pressure
Implementation Method 2
These systems use a manifold instead of tubes to distribute at least part of the fluid to the different components of the device... external buffer volumes may be used outside the manifold to try to obtain a ripple free fluid flow
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A device, system and method related to a pneumatic system for fluid analysis. The device, system and method comprises a connection interface for a fluid analyser unit, a connection interface for a pump unit, a flow sensor and a pressure sensor. The device, system and method further comprises control unit for calculating a pump stroke force or amplitude, and/or pump frequency based on measurements from the flow sensor and the pressure sensor for obtaining a constant flow through the pneumatic system.