Gravity-Fed IV Flow Control With Closed-Loop Sensing
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Solution Overview
Problem
Existing intravenous delivery systems face challenges in maintaining a consistent flow rate due to variations in pressure differential caused by liquid level changes and occlusions, requiring manual and error-prone adjustments by clinicians.
Innovation Solution
A flow rate control system with a sensor, regulator, and controller that automatically adjusts the flow rate by detecting and comparing actual flow rates to desired rates, using methods like drop counting or mass/volume measurement, and regulating flow through tubing pinching or cam mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual flow rate measurement and adjustment by clinicians is used, then system complexity is reduced, but time consumption and human error increase
Solution Approach 1:
The system performs self-measurement of flow rate through automated sensor detection and self-adjustment through automated regulator control, eliminating the need for manual clinician intervention in flow rate monitoring and adjustment
Solution Approach 2:
Manual mechanical measurement and adjustment operations are replaced with an automated electronic control system that uses sensors to detect flow rate and electronic regulators to adjust flow, substituting human manual operations with automated mechanical and electronic systems
2Device complexity
If manual flow rate measurement and adjustment by clinicians is used, then system complexity is reduced, but reliability decreases due to human error
Solution Approach 1:
The system continuously measures actual flow rate using sensors and compares it with the desired flow rate, then automatically adjusts the regulator to maintain the target flow rate, creating a closed-loop feedback control system that eliminates human error in flow rate management
Solution Approach 2:
The system autonomously monitors and adjusts flow rate without human intervention, performing self-correction when deviations occur, thereby eliminating human error sources while maintaining simple system operation
3Reliability
If automated flow rate control system with sensors and regulators is implemented, then flow rate consistency and reliability improve, but device complexity increases
Solution Approach 1:
The automated control system uses sensors to continuously monitor flow rate and compares actual flow with desired flow, then adjusts the regulator accordingly to maintain consistent flow rate, achieving high reliability through closed-loop feedback control
Solution Approach 2:
The control system acts as an intermediary between the liquid source and the patient, using sensors and regulators to mediate and maintain precise flow rate control, ensuring consistent drug delivery while managing system complexity through modular architecture
4Productivity
If automated flow rate control system is implemented, then time efficiency improves, but device complexity and cost increase
Solution Approach 1:
The system autonomously performs flow rate measurement, comparison, and adjustment without requiring clinician time for manual operations, achieving high time efficiency by eliminating human labor from repetitive flow management tasks
Solution Approach 2:
Manual mechanical operations of flow rate measurement and adjustment are replaced with automated electronic sensors and control systems, substituting human time investment with automated mechanical and electronic systems that operate continuously without fatigue
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
Provides a reliable, time-efficient, and cost-effective method to maintain consistent fluid delivery by automatically adjusting flow rates, reducing human error and system complexity.
Implementation Method 1
measuring the flow rate of the liquid by counting the number of drops that enter the drip chamber over a period of time
Implementation Method 2
measuring the differential mass of the liquid over a predetermined period of time
Implementation Method 3
measuring the differential volume of the liquid over a predetermined period of time
Implementation Method 4
The flow rate regulator may be coupled to the tubing to control the rate of liquid flow through the tubing by compressing the tubing to varying degrees
Implementation Method 5
the liquid source may be elevated above the patient, so that a 'head' or pressure differential exists between the liquid in the liquid source, and the location at which the liquid is delivered to the patient
Implementation Method 6
a 'head' or pressure differential exists between the liquid in the liquid source, and the location at which the liquid is delivered to the patient
Data Source
AI summary
An intravenous delivery system may operate by gravity feed, and may have a liquid source containing a liquid, a drip unit that receives the liquid from the liquid source, and tubing that receives the liquid from the drip unit for delivery to a patient. A flow rate sensor may be used to measure a flow rate of liquid through the intravenous delivery system, and may generate a flow rate signal indicative of the flow rate. A controller may receive the signal, and may compare the flow rate with a desired flow rate. If the flow rate is more or less than the desired flow rate, the controller may transmit a control signal to a flow rate regulator. The flow rate regulator may receive the control signal and, in response, modify the flow rate to bring the flow rate closer to the desired flow rate.