IV Pump Calibration via Reed Switch Fluid Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current IV infusion systems face inaccuracies in drug delivery due to the ±0.05 mm inner diameter tolerance of IV tubing, leading to variations in fluid volume and flow rate, which can result in either under or over-administration of medication, potentially harming patients and wasting medication.
Innovation Solution
A system and method for calibrating the flow rate of IV pumps by using a control unit to measure the time it takes for medicinal fluid to rise through a chamber with a known constant volume, comparing this to the pre-set flow rate, and adjusting the pump's rotational speed to ensure accurate delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If IV tubing with standard inner diameter tolerance (±0.05 mm) is used, then manufacturing cost and ease of manufacture are improved, but manufacturing precision and drug delivery accuracy deteriorate
Solution Approach 1:
The system measures the actual inner diameter of the IV tubing using a sensor and control unit, compares it to the nominal diameter, and uses this feedback to calculate a correction factor that compensates for the tolerance variation, thereby maintaining manufacturing precision without requiring tighter tolerances
Solution Approach 2:
The system changes the operational parameters of the IV pump based on the measured tubing dimensions. By adjusting pump speed and flow rate according to the actual tubing inner diameter, the system compensates for manufacturing variations and achieves accurate drug delivery despite using standard tolerance tubing
2Productivity
If IV pump flow rate is increased to improve productivity, then medication delivery speed is improved, but measurement precision and dosage accuracy deteriorate
Solution Approach 1:
The control unit continuously monitors the actual flow rate through sensors and compares it to the target flow rate, providing feedback that allows real-time adjustments to maintain measurement precision even at higher productivity levels
Solution Approach 2:
The system dynamically adjusts pump operation based on real-time measurements. The pump speed and flow rate are not fixed but are continuously optimized based on actual tubing characteristics and measured flow conditions, allowing high productivity while maintaining accuracy
3Measurement precision
If a calibration system with multiple sensors and complex measurement mechanisms is implemented, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts only the essential measurement function needed for calibration - using a simple sensor to measure the inner diameter of the tubing. By taking out only the critical measurement parameter rather than implementing comprehensive multi-sensor systems, the solution achieves sufficient precision without excessive complexity
Solution Approach 2:
The system uses a simple intermediary measurement approach - measuring the inner diameter of the tubing as an intermediate parameter that can then be used to calculate all necessary flow rate corrections. This single intermediary measurement replaces the need for multiple direct flow measurements
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
This approach improves the accuracy of medication delivery by compensating for tube diameter variations, ensuring precise administration of medicinal fluids and reducing wastage.
Implementation Method 1
The reed switch mechanism comprises a reed switch and a magnetic object. The magnetic object is located in the chamber and the reed switch is located on an exterior surface of the chamber. The magnetic object rises as the medicinal fluid fills the chamber.
Data Source
AI summary
A system and method for calibrating an IV pump infusion system tube comprises a fluid source, an infusion system comprising, an IV pump, a drive unit, a chamber with known constant volume, a control unit, and IV tubing with a known inner diameter tolerance, and a switch and magnetic floating object. The system administers medicinal fluid, calculates the flow rate of the medicinal fluid in the chamber by measuring the time the switch is activated as medicinal fluid rises in the chamber, compares the calculated flow rate with a set flow rate of the IV pump input in the control unit prior to infusion, and adjusts the IV pump and flow rate based on the compared deviations for more accurate delivery to a patient. This configuration may provide a more precise delivery rate of medicinal fluid, preventing harm to the patient and waste of medicine.