Pneumatic Volumetric Pump for Precise Flow and Occlusion Sensing
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Solution Overview
Problem
Conventional fluid pumps lack precision and sensitivity in fluid delivery, often requiring significant force for pressure adjustments and failing to detect occlusions until high pressure thresholds are reached, leading to potential errors and safety risks in medical and laboratory settings.
Innovation Solution
A tightly load-coupled pneumatic driver (TLCP driver) system that uses a microblower to generate differential pressure and flow, coupled with a flexible membrane interface and pressure sensors, allowing for precise control of gas drive pressure and flow rate, and detecting occlusions with high sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional fluid pumps are used for fluid delivery, then the device structure is simple, but the precision and sensitivity of fluid delivery is insufficient
Solution Approach 1:
The system is divided into distinct functional modules: a tightly load-coupled pneumatic driver, a flexible membrane interface, pressure sensors, and control electronics. This segmentation allows each component to be optimized for its specific function while contributing to overall precision without requiring complete system redesign.
Solution Approach 2:
The patent replaces traditional mechanical pump mechanisms with a pneumatic driver that uses gas pressure to control fluid delivery. This substitution eliminates mechanical wear and improves precision by using compressible gas to achieve fine pressure and flow control.
2Stress or pressure
If conventional pumps are used, then the device is easy to operate, but significant force is required for pressure adjustments
Solution Approach 1:
The system uses a pneumatic driver to generate and control gas pressure, which is then transmitted through a flexible membrane to control fluid pressure. This pneumatic approach allows for smooth, fine-grained pressure adjustments without requiring significant manual force, as gas compressibility provides natural pressure regulation.
Solution Approach 2:
The patent changes the physical state of the drive medium from liquid or mechanical contact to compressible gas. This parameter change enables pressure adjustments through gas compression and expansion, which require minimal force and provide precise control through the gas's inherent compressibility characteristics.
3Reliability
If conventional pumps are used, then the device complexity is low, but occlusion detection sensitivity is insufficient
Solution Approach 1:
The system incorporates pressure sensors that continuously monitor pressure in the fluid path and provide feedback to the control system. When an occlusion is detected through pressure changes, the system can immediately respond by adjusting the pneumatic driver or alerting the user, enabling early detection before high pressure thresholds are reached.
Solution Approach 2:
Traditional mechanical occlusion detection methods are replaced with electronic pressure sensing. This substitution provides higher sensitivity and faster response times, as electronic sensors can detect minute pressure changes that would be imperceptible to mechanical systems, thereby improving reliability without requiring complex mechanical mechanisms.
4Speed
If conventional pumps are used, then the manufacturing process is simple, but rapid pressure adjustments cannot be achieved
Solution Approach 1:
The use of compressible gas in the pneumatic driver enables rapid pressure adjustments through simple valve control and gas flow modulation. Gas can be compressed and expanded almost instantaneously compared to mechanical systems, allowing for fast pressure changes without complex manufacturing requirements.
Solution Approach 2:
The system is designed to be dynamically responsive, with the pneumatic driver and flexible membrane interface capable of rapid pressure changes. This dynamic design allows the system to adapt quickly to changing flow requirements or occlusion conditions, achieving fast pressure adjustments through the inherent responsiveness of the pneumatic components.
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 precise and sensitive fluid delivery with rapid pressure adjustments, detecting occlusions at low pressure increases, reducing the risk of errors and ensuring safe and accurate fluid administration in medical and laboratory applications.
Implementation Method 1
a tightly load-coupled pneumatic driver (TLCP driver) that is configured to receive input power that causes the TLCP driver to move gas into the gas reservoir to produce a gas drive pressure
Implementation Method 2
a gas-fluid interface that couples pressure in the fluid reservoir to pressure in a fluid path. The fluid path is configured so that the fluid drive pressure driving the liquid in the fluid path is substantially the same as the fluid reservoir pressure
Data Source
AI summary
A system for precision liquid delivery includes a gas reservoir having a known volume. The system has a tightly load-coupled pneumatic driver (a “TLCP driver”) that is configured to receive input power to cause the TLCP driver to move gas into the gas reservoir to produce a gas drive pressure. A valve is configured to couple the gas reservoir with a fluid reservoir having an unknown volume. The valve is further configured to selectively isolate or pneumatically couple pressures in the gas reservoir and the fluid reservoir. A gas-fluid interface couples pressure in the fluid reservoir to pressure in a fluid path. The fluid path is configured so that the fluid drive pressure driving the liquid in the fluid path is substantially the same as the fluid reservoir pressure. The system also has a pressure sensor configured to detect pressure in the gas reservoir and/or the fluid reservoir.