Medical Pump Selecting Valve Clog Prevention
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Solution Overview
Problem
Current medical pumps face challenges in precision metering and clogging issues, particularly during enteral feeding, leading to reflux and clog formation, which can result in patient complications such as aspiration pneumonia and inefficient fluid administration.
Innovation Solution
A medical pump system with a selecting valve controlled by an electronic control unit, capable of alternately opening and closing fluid tubes, and using a software-controlled pumping mechanism to administer fluids at precise rates, including a method to prevent clogs by using softening and flushing strokes, and integrating medication administration with reflux compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a peristaltic pump with a polygonal rotor is used for feeding, then the pump offers low cost disposable parts and avoids sterilization needs, but it suffers from sensitivity to clogging and lacks sufficient accuracy in flow rate control
Solution Approach 1:
The pump system is divided into disposable parts (tubes, fluid chamber) and reusable parts (pump mechanism, selecting valve). This segmentation allows the critical pump components to be reusable and sterilizable while keeping patient-contact parts disposable and low-cost, resolving the contradiction between manufacturing ease and reliability.
Solution Approach 2:
A selecting valve is introduced as an intermediary component to control fluid flow from multiple tubes. This valve prevents clogging by directing flow through different paths and allows the pump to switch between feeding and flushing modes, improving reliability while maintaining the peristaltic mechanism.
2Device complexity
If a peristaltic pump is used for feeding, then the pump structure is simple and cost-effective, but it lacks sufficient accuracy in flow rate control which is critical for medication administration
Solution Approach 1:
The pump incorporates a microprocessor-controlled system that dynamically adjusts the pumping parameters. The selecting valve and pump motor speed are controlled based on real-time requirements, enabling precise flow rate control for different fluids (feeding at lower rates, medication at exact rates) while maintaining a relatively simple overall structure.
Solution Approach 2:
The pump system includes control logic that monitors and adjusts flow rates based on the selected tube and fluid type. The microprocessor controls the pump motor speed and selecting valve positioning to achieve precise metering for medication while maintaining simplicity for feeding applications.
3Adaptability or versatility
If multiple fluids are administered through separate pumps, then each fluid can be controlled independently, but the device complexity and cost increase significantly
Solution Approach 1:
The pump system is designed as a multi-functional device that can handle multiple fluids (feeding, water, medication) through a single pump mechanism. The selecting valve enables the single pump to switch between different fluid sources and destinations, providing the versatility of multiple pumps while maintaining the simplicity and cost-effectiveness of a single pump system.
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 provides precise and safe administration of multiple fluids, reducing reflux and clog formation, ensuring accurate fluid delivery and improving patient feeding outcomes by compensating for gastric residual volume and reflux events.
Implementation Method 1
a piston which is sealing the fluid chamber and connected to a drive mechanism, the drive mechanism pulls the piston to draw fluid from one of the least two intake openings and pushes the piston to discharge the fluid into the outlet opening
Implementation Method 2
a selecting valve enclosing at least two tubes, each providing fluid to one of the at least two intake openings, wherein the selecting valve closes one of the at least two tubes while opening another of the at least two tubes
Implementation Method 3
When dealing with feeding pumps most are based on a peristaltic principle, where a polygonal rotor is pushing fluids into a flexible tube
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A medical pump, comprising: a fluid housing having a plurality of intake openings, sealed by at least one intake valve, and an outlet opening sealed by an outlet valve; a piston which is sealing the fluid housing and connected to a drive mechanism, the drive mechanism pulls the piston to draw fluid from one of the least two intake openings and pushes the piston to discharge the fluid into the outlet opening; and a selecting valve enclosing at least two tubes, each providing fluid to one of the at least two intake openings, wherein the selecting valve closes one of the at least two tubes while opening another of the at least two tubes.