Pneumatic Pump Box Layout for Cooler, Longer-Life Fluid Delivery
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Solution Overview
Problem
Existing medical fluid delivery machines using pneumatic pumping face challenges such as heat management, limited lifespan of pneumatic pressure accumulators, and inefficiencies in tubing routing, which affect the reliability and efficiency of fluid delivery.
Innovation Solution
The proposed medical fluid delivery machine incorporates a thermally efficient pneumatic pump box with a vacuum pump positioned at the top to minimize heat impact on other components. The pump box includes a dryer to remove water from compressed air and a fan to dissipate heat. Additionally, the use of elastic accumulator bladders in rigid housings extends the usable life of pneumatic pressure accumulators by maintaining pressure delivery until the bladder is fully contracted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the vacuum pump is positioned at the bottom of the pneumatic pump box, then the structure is simple, but heat generated by the vacuum pump adversely affects other pneumatic components
Solution Approach 1:
The patent resolves the heat management issue by transitioning from a horizontal layout to a vertical arrangement of pneumatic components. The vacuum pump is positioned at the bottom, the compressor at the top, and the pneumatic accumulators in the middle section, creating a vertical thermal gradient that isolates heat-generating components from sensitive pneumatic elements while maintaining structural simplicity
2Device complexity
If pneumatic accumulators are used without elastic bladders, then the structure is simpler, but the usable life is limited as pressure drops over time
Solution Approach 1:
The patent incorporates elastic bladders within rigid pneumatic accumulators to maintain constant pressure over time. The elastic bladder expands and contracts to compensate for pressure changes, ensuring reliable pneumatic pressure delivery throughout the entire usable life of the accumulators while the rigid housing provides structural support
3Device complexity
If compressed air is stored without removing water, then the system is simpler, but water causes corrosion in solenoid valves and pneumatic components
Solution Approach 1:
The patent implements a dryer that removes water from compressed air before the air is stored in the pneumatic accumulators. This preliminary drying action prevents water accumulation and subsequent corrosion of solenoid valves and pneumatic components, ensuring long-term reliability without requiring complex corrosion protection systems
4Productivity
If tubing routing is optimized for efficiency, then fluid delivery is more effective, but the routing becomes more complex
Solution Approach 1:
The patent segments the pneumatic system into distinct functional zones (vacuum pump section, compressor section, accumulator section) with dedicated tubing routes for each. This segmentation allows for efficient fluid delivery within each zone while simplifying the overall routing architecture by reducing cross-contamination of tubing paths
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 enhances the thermal efficiency and operational longevity of pneumatic components, improves tubing routing for reduced complexity, and ensures continued pneumatic pressure delivery during power loss, thereby improving the overall reliability and efficiency of medical fluid delivery.
Implementation Method 1
a source or means for generating negative pressure, such as a vacuum pump
Implementation Method 2
a source or means for generating positive pressure, such as a compressor
Data Source
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AI summary
A medical fluid delivery machine (90) is described. The machine comprises a medical fluid pump (200) including: a pneumatically actuated pump chamber (202), first and second pneumatically actuated medical fluid valve chambers (212, 222) positioned to be inlet and outlet valves to and from the pneumatically actuated pump chamber (202), a positive pressure accumulator (158) storing positive pressure air for delivery to the pneumatically actuated pump chamber (202) and the first and second pneumatically actuated medical fluid valve chambers (212, 222), a first binary valve (240b) located pneumatically between the positive pressure accumulator (158) and the first pneumatically actuated medical fluid valve chamber (212), a second binary valve (240e) located pneumatically between the positive pressure accumulator (158) and the second pneumatically actuated medical fluid valve chamber (222), at least one of (i) a third binary valve (240a) located pneumatically between the first pneumatically actuated medical fluid valve chamber (212) and atmosphere, or (ii) a fourth binary valve (240f) located pneumatically between the second pneumatically actuated medical fluid valve chamber (222) and atmosphere. The machine also comprises a control unit (50) configured to cause at least one of (i) the first binary valve (240b) to close and the third binary valve (240a) to open to enable the first pneumatically actuated medical fluid valve chamber (212) to fluidicially open, or (ii) the second binary valve (240e) to close and the fourth binary valve (240f) to open to enable the second pneumatically actuated medical fluid valve chamber (222) to fluidicially open.