Radiopharmaceutical Dosing Control via Real-Time Volume Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional automated fluid delivery systems fail to accurately adjust for variances in infusion system components and operating characteristics, leading to inaccurate delivery of medical fluids, particularly radiopharmaceuticals, due to fixed infusion rates and lack of real-time volume control.
Innovation Solution
A radiopharmaceutical dispensing system that includes a pump and sensors to measure fluid properties, with a computing device controlling the pump to dispense precise doses by comparing sample volumes with expected volumes, adjusting for variations in fluid delivery channel dimensions and radioactivity levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional automated infusion systems use fixed infusion rates and standard pump operations, then the system operation is simple and device complexity is low, but the delivery accuracy and dosing precision deteriorate due to variances in components and operating characteristics
Solution Approach 1:
The system measures the actual volume of fluid delivered by the pump and compares it to the expected volume. Based on this feedback, the system automatically adjusts pump parameters (such as pump coefficient, infusion rate) to compensate for variances in delivery accuracy, ensuring precise dosing while maintaining automated operation.
Solution Approach 2:
The system dynamically changes pump operating parameters based on measured performance. The pump coefficient is adjusted according to the ratio of expected volume to actual volume, and infusion rates are modified in real-time to maintain accurate dosing despite component variances.
2Measurement precision
If the system uses real-time measurements and dynamic adjustments to ensure accurate dosing, then dosing precision is improved, but the device complexity and measurement requirements increase
Solution Approach 1:
The system performs self-calibration by measuring its own fluid delivery performance and automatically adjusting its parameters. The pump system uses its own operational data (actual volume delivered vs. expected volume) to refine its control parameters without requiring external calibration equipment or complex measurement systems.
3Reliability
If the pump operates at fixed infusion rates without real-time control, then the operation is simple and ease of operation is high, but the reliability of accurate fluid delivery deteriorates due to component variances
Solution Approach 1:
The system continuously monitors actual fluid delivery and automatically adjusts pump parameters to maintain reliable dosing. This closed-loop control ensures consistent and reliable fluid delivery accuracy without requiring manual intervention or complex user operations.
4Manufacturing precision
If the system adjusts pump parameters dynamically based on measured volume, then dosing accuracy is improved, but the computation requirements and processing complexity increase
Solution Approach 1:
The system replaces complex mechanical dosing mechanisms with computational control. Instead of using precisely machined mechanical components to ensure accurate dosing, the system uses software algorithms to calculate and adjust pump parameters based on measured performance, achieving high dosing accuracy through computation rather than mechanical precision.
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
Methods and systems for dispensing a fluid using an automated fluid delivery system are disclosed. A pump may be configured to force an aliquot of fluid into a fluid delivery channel. A processor may receive values of a property for the aliquot and the source of the aliquot. The processor may use the values to determine the volume of the aliquot. The determined volume is compared by the processor against an expected volume to establish the amount of fluid being pumped by the pump per unit, such as time or revolutions. The processor controls operation of the pump to dispense a predetermined dose based on the amount of fluid being pumped by the pump per unit.