Peristaltic Pump Feedback Control for Insulin Delivery Accuracy
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Solution Overview
Problem
Conventional ambulatory insulin infusion devices with peristaltic pumping mechanisms experience variable flow rates due to pulsations, leading to inaccuracies in fluid delivery, especially during low basal insulin delivery, and require high-energy mechanical solutions to mitigate these issues, which are bulky and inefficient.
Innovation Solution
A portable dispensing unit with a peristaltic pumping mechanism that incorporates sensors and a processor for closed-loop feedback control, compensating for pulsations and ensuring constant flow rates by monitoring the relative position of movable components and adjusting motor operations accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a peristaltic pumping mechanism is used in ambulatory insulin infusion devices, then the device can be made portable and maintain fluid sterility, but the flow rate becomes variable due to pulsations, reducing delivery accuracy
Solution Approach 1:
The patent implements a feedback control system using a flow sensor to detect actual flow rate and a controller to adjust the peristaltic pump's operation. The sensor monitors flow in real-time and feeds this information back to the controller, which modulates the pump's roller activation to compensate for pulsations and maintain a constant average flow rate, thereby resolving the contradiction between portability and flow accuracy.
Solution Approach 2:
The patent changes the operational parameters of the peristaltic pump by varying the duration and frequency of roller activation on the delivery tube. Instead of continuous uniform rotation, the system dynamically adjusts the pumping cycle parameters based on feedback from the flow sensor, enabling precise control of average flow rate while maintaining the portability benefits of the peristaltic mechanism.
2Device complexity
If conventional peristaltic mechanisms operate without feedback control, then the device structure remains simple, but pulsations cause significant inaccuracies in low flow rate delivery
Solution Approach 1:
The patent introduces a feedback control loop comprising a flow sensor and controller that monitors and adjusts the peristaltic pump operation in real-time. This feedback mechanism enables precise control of fluid delivery by compensating for pulsations through dynamic adjustment of pump parameters, achieving high delivery precision while maintaining relatively simple device architecture suitable for manufacturing.
3Reliability
If mechanical means are used to reduce pulsations in peristaltic pumps, then flow rate stability improves, but the device becomes bulky and energy consumption increases
Solution Approach 1:
The patent replaces complex mechanical pulsation reduction mechanisms with an electronically controlled feedback system. Instead of using additional mechanical components like dampers or complex gear systems that会增加 device bulk and energy consumption, the invention uses electronic sensors and controllers to modulate the peristaltic pump's operation, achieving flow rate stability through intelligent control rather than mechanical means.
Solution Approach 2:
The patent achieves flow rate stability by dynamically changing the operational parameters of the peristaltic pump based on real-time flow measurements. The controller adjusts roller activation timing and duration to compensate for pulsations, maintaining stable average flow rate without requiring additional mechanical components that would increase device size and energy consumption.
4Productivity
If the peristaltic pump operates at high speed to deliver required fluid volume, then delivery time is reduced, but pulsations increase and accuracy decreases
Solution Approach 1:
The patent employs a feedback control system where a flow sensor continuously monitors the actual flow rate and a controller adjusts the peristaltic pump's roller activation parameters in real-time. This enables the system to operate at higher speeds for improved productivity while maintaining dosage accuracy through continuous compensation for pulsations based on actual flow measurements.
Solution Approach 2:
The patent makes the peristaltic pump operation dynamic by continuously adjusting roller activation parameters based on real-time flow feedback. The system transitions from static, fixed-speed operation to dynamic, adaptive control where pump parameters are continuously optimized to maintain accuracy across varying delivery speeds, enabling both high productivity and precise dosing.
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 solution provides accurate and consistent fluid delivery, minimizing pulsations and backflow, thereby enhancing the reliability and effectiveness of therapeutic treatments by maintaining precise control over fluid dosage.
Implementation Method 1
A peristaltic mechanism typically includes a rotary wheel with rollers and a flexible delivery tube. The rotary wheel with rollers periodically squeezes the flexible tube and delivers the fluid in the direction of rotation of the rotary wheel.
Data Source
AI summary
Devices and methods for delivering therapeutic fluid to a patient's body are described. The devices may comprise a dispensing unit having a reservoir, a driving mechanism having a movable member for delivering therapeutic fluid to a patient's body, at least one sensor for sensing a relative position of the movable member and generating a signal, and a processor for controlling the driving mechanism to deliver an amount of therapeutic fluid that compensates for a change in the flow of the therapeutic fluid occurring during fluid delivery. The methods may be implemented by operating the driving mechanism, receiving a signal based on the position of the movable member, determining an amount of therapeutic fluid to deliver, and controlling the driving mechanism to deliver an amount of fluid that compensates for a change in flow occurring during fluid delivery.