Active Rectification Circuit for Air Bubble Detection in Fluid Lines
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Solution Overview
Problem
Existing medical fluid delivery systems struggle to accurately detect and manage air bubbles in fluid lines, which can lead to adverse patient outcomes due to the delivery of excessive air and offsetting the therapeutic fluid volume.
Innovation Solution
A system utilizing active rectification, including a transmitter, receiver, and air-detection circuit with active rectifiers, to transduce and process ultrasonic vibrations for detecting air bubbles in fluid lines, using amplifiers, sample-and-hold circuits, and processors to determine bubble presence and volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional air detection methods are used in fluid lines, then the system structure remains simple, but the detection precision and reliability are insufficient leading to inaccurate air bubble detection
Solution Approach 1:
The patent replaces traditional mechanical or simple optical air detection methods with an ultrasonic detection system. The ultrasonic transmitter and receiver detect air bubbles through acoustic impedance differences, providing superior detection precision while the integrated circuit implementation keeps the overall system complexity manageable.
Solution Approach 2:
The patent employs active rectification to convert the ultrasonic receiver signal from AC to DC form, enabling precise measurement of signal amplitude changes that occur when ultrasonic waves pass through air bubbles versus fluid. This parameter transformation allows for accurate detection thresholds to be established.
2Reliability
If active rectification circuitry is implemented for precise air detection, then detection reliability improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent integrates the active rectification circuit, amplification stages, and detection logic into a single integrated circuit chip. This consolidation improves detection reliability through stable, controlled circuit operation while simplifying manufacturing by reducing the number of discrete components and assembly steps.
Solution Approach 2:
The active rectification circuit automatically compensates for signal variations and noise without requiring external calibration or adjustment. The circuit self-regulates to maintain optimal detection performance, improving reliability while reducing manufacturing complexity by eliminating calibration procedures.
3Measurement precision
If ultrasonic active rectification is used to detect air bubbles, then detection accuracy improves, but the energy consumption and system complexity increase
Solution Approach 1:
The ultrasonic transmitter operates in periodic pulses rather than continuous transmission, sending bursts of ultrasonic energy through the fluid line at intervals. This periodic operation maintains sufficient detection accuracy for clinical purposes while dramatically reducing average energy consumption compared to continuous transmission.
Solution Approach 2:
The active rectification circuit continuously processes the ultrasonic receiver signal to maintain constant detection capability between ultrasonic pulses. This ensures that air bubbles are detected reliably regardless of when they pass through the detection zone, maintaining continuous useful action despite pulsed transmission.
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
Effectively detects and manages air bubbles in fluid lines, ensuring accurate fluid delivery by adjusting flow rates and alerting for excessive air, thereby improving patient outcomes.
Implementation Method 1
a transmitter, receiver, and air-detection circuit. The transmitter is configured to transduce a driver signal to ultrasonic vibrations
Implementation Method 2
The receiver is configured to receive the ultrasonic vibrations and transduce the ultrasonic vibrations to provide a receiver signal
Implementation Method 3
a system, method, and apparatus for detecting air in a fluid line using active rectification
Data Source
AI summary
A circuit for detecting air, a related system, and a related method are provided. The circuit for detecting air includes a receiver connection and an air-detection circuit. The receiver connection is configured to provide a receiver signal. The air-detection circuit is in operative communication with the receiver connection to process the receiver signal to generate a processed signal corresponding to detected air. The air-detection circuit includes one or more active-rectifying elements configured to actively rectify the receiver signal to provide the processed signal.