Pressure Transducer Auto-Zeroing and Level Compensation
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Solution Overview
Problem
Current vital signs monitors require manual and frequent zeroing of pressure transducers, which is time-consuming and exposes patients to contamination risks, and also necessitate precise leveling to avoid measurement errors, especially in urgent situations where time is critical.
Innovation Solution
An automatic zeroing and electronic level adjustment system for pressure transducers using a circuit with two differential amplifiers and specific software to eliminate the need for manual zeroing and leveling, allowing for immediate monitoring initiation and reducing contamination risks by maintaining accurate pressure measurements without exposing the transducer to atmospheric pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual zeroing of pressure transducer is performed, then measurement accuracy is improved, but time consumption and contamination risk increase
Solution Approach 1:
The system performs automatic zeroing without requiring manual intervention. The microprocessor automatically triggers the zeroing sequence, opens the three-way stopcock, waits for stabilization, and resets the pressure reading to zero, eliminating the need for manual zeroing operations by nursing staff
Solution Approach 2:
The system performs zeroing automatically at predetermined intervals or when specific conditions are detected, before measurement errors can significantly affect patient monitoring. This preliminary automatic action ensures measurement accuracy without requiring manual intervention at the moment of need
2Measurement precision
If manual zeroing of pressure transducer is performed, then measurement accuracy is improved, but patient contamination risk increases
Solution Approach 1:
The automatic zeroing system eliminates the need for manual handling of the three-way stopcock and transducer, reducing the opportunity for contamination during the zeroing process. The system autonomously manages the zeroing sequence without exposing the transducer to environmental contaminants that would occur during manual zeroing
Solution Approach 2:
The system replaces manual mechanical operations with automated electronic control. The microprocessor controls the three-way stopcock and zeroing sequence through electronic signals, eliminating the need for manual manipulation that could introduce contaminants to the closed fluid system and patient
3Measurement precision
If transducer leveling is performed manually, then measurement accuracy is improved, but device complexity and operation difficulty increase
Solution Approach 1:
The system replaces manual mechanical leveling operations with electronic sensors and automated calculations. Accelerometers and other sensors detect the transducer's position and orientation, and the microprocessor automatically calculates and applies the necessary correction factors to compensate for gravitational effects, eliminating the need for manual leveling by nursing staff
Solution Approach 2:
The system automatically detects and corrects for gravitational effects on pressure measurements without requiring manual intervention. The microprocessor continuously monitors transducer position and automatically adjusts measurements to account for height differences and orientation, making the system self-correcting and eliminating complex manual leveling procedures
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
Enables prompt and accurate monitoring without the need for frequent zeroing or leveling, reducing contamination risks and measurement errors, and allowing for flexible transducer placement, improving patient safety and efficiency in urgent procedures.
Implementation Method 1
general pressure transducers are usually 'Wheatstone' bridge type, as shown in FIG. 2. This circuit type provides in its output a differential voltage proportional to the pressure applied to the sensor
Implementation Method 2
a differential type amplifier circuit is usually used, amplifying the difference between the voltages applied to its inputs
Data Source
AI summary
The present invention provides automatic zeroing and electronic level adjustment of pressure transducer in relation to patient, applied to vital signs monitors, where the automatic zeroing of circuit of pressure consists of circuit and software able to remove the value of the virtual ground voltage from the pressure calculation, and the electronic level adjustment of transducer in relation to patient consists of compensating, through software, the value in mmHg related to level difference in cmH2O informed by the user by means of monitor interface.