Infusion Device Peristaltic Pump Optical Encoder Feedback Control
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Solution Overview
Problem
Existing infusion devices rely on medical personnel's experience to detect and manage unexpected changes in medicinal liquid supply, which can lead to safety issues due to insufficient immediate identification and handling of abnormalities.
Innovation Solution
An infusion device equipped with a peristaltic pump, gear set, optical encoder, motor, and control module, which automatically detects flow rate abnormalities using the optical encoder and adjusts the peristaltic pump's frequency to maintain stable infusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If medical personnel visually observe the infusion situation based on their experience, then the operation flexibility is maintained, but the response time to abnormality is delayed and reliability is reduced
Solution Approach 1:
The system continuously monitors the actual flow rate through the flow sensor and compares it with the preset flow rate in the control module. When a discrepancy is detected, the system automatically adjusts the peristaltic pump speed or alerts medical personnel, eliminating the need for manual visual observation and ensuring immediate response to flow abnormalities.
Solution Approach 2:
The infusion device autonomously monitors its own operation status, detects flow rate abnormalities, and self-adjusts the pump speed through the control module without requiring continuous manual intervention. This self-monitoring and self-correction capability ensures reliable and timely response to infusion issues.
2Measurement precision
If manual observation and experience-based judgment are used, then device complexity is low, but measurement precision of flow rate is insufficient
Solution Approach 1:
The system replaces manual visual observation and experience-based judgment with automated electronic sensors and control systems. The flow sensor provides precise quantitative measurement of the flow rate, and the control module processes this data to automatically adjust pump operation, achieving high measurement precision through electronic rather than human assessment.
3Reliability
If automatic detection and adjustment systems are implemented, then reliability and response time are improved, but device complexity increases
Solution Approach 1:
The control module serves multiple functions: it stores preset flow rate parameters, receives real-time flow data from the sensor, compares actual vs. target flow rates, and controls the peristaltic pump speed. This multi-functional integration achieves high reliability and automatic response while minimizing the number of separate components, thereby controlling system complexity.
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 infusion device can immediately and automatically adjust the medicinal liquid supply to prevent abnormalities, ensuring stable and safe infusion without relying on medical personnel's experience.
Implementation Method 1
an optical encoder (3) connected to the gear set (2), the optical encoder (3) being used to detect a rotational speed of the motor (4)
Implementation Method 2
a peristaltic pump (1) coupled to an infusion tube (P), the peristaltic pump (1) being used to transport a fluid (not shown in the figures) in the infusion tube (P)
Data Source
AI summary
An infusion device includes a peristaltic pump, a gear set, an optical encoder, a motor, and a control module. The peristaltic pump is used to transport a fluid in an infusion tube. The motor is used to output power to drive the peristaltic pump, such that the peristaltic pump squeezes the infusion tube to transport the fluid. The optical encoder is driven by the motor to operate synchronously with the peristaltic pump. The control module is electrically connected to the motor and the optical encoder. The optical encoder is used to detect a rotational speed of the motor. The control module detects a flow rate of the fluid in the infusion tube based on the rotational speed, and the control module controls the rotational speed to change a peristaltic frequency of the peristaltic pump squeezing the infusion tube to adjust the flow rate.