Pressure Transducer Auto-Zeroing and Electronic Level Adjustment
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Solution Overview
Problem
Current vital signs monitoring systems require manual zeroing and leveling of pressure transducers, which are time-consuming, expose patients to contamination risks, and result in measurement errors due to zero drift and level differences, especially in urgent situations where time is critical.
Innovation Solution
An automatic zeroing and electronic level adjustment system 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 accurate pressure measurement without exposing the transducer to atmospheric pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual zeroing and leveling procedures are performed, then measurement accuracy is improved, but time consumption and operational complexity increase
Solution Approach 1:
The system performs automatic zeroing and leveling without requiring manual intervention. The microprocessor automatically executes zeroing by triggering a valve to expose the transducer to atmospheric pressure and calculates leveling based on patient data (height, weight, age) and transducer position, eliminating the need for manual procedures while maintaining measurement accuracy
Solution Approach 2:
The system performs zeroing automatically before pressure monitoring begins and recalibrates at predetermined intervals (e.g., every 8 hours). This preliminary and periodic action ensures measurement accuracy is maintained without requiring manual intervention at each calibration point, reducing time loss while preserving precision
2Measurement precision
If manual zeroing is performed by opening the system to atmospheric pressure, then transducer calibration is achieved, but patient contamination risk increases
Solution Approach 1:
A valve is introduced as an intermediary component that controls the exposure of the transducer to atmospheric pressure. The valve can be automatically triggered to open briefly for zeroing and then automatically closed, isolating the patient's vascular system from the external environment. This intermediary mechanism enables necessary calibration while minimizing contamination risk by limiting exposure time and enabling automatic closure
3Measurement precision
If transducer leveling is performed manually, then measurement accuracy is improved, but device complexity and ease of operation worsen
Solution Approach 1:
The manual mechanical leveling process is replaced with an electronic calculation system. The microprocessor calculates the required leveling adjustment based on patient anthropometric data (height, weight, age), transducer position relative to the patient, and gravitational acceleration. This substitution transforms a complex manual mechanical adjustment into a simple electronic calculation, improving ease of operation while maintaining measurement accuracy
Solution Approach 2:
The system changes from fixed mechanical leveling to dynamic electronic parameter adjustment. By using patient-specific parameters (height, weight, age) and transducer position data, the system calculates and applies customized leveling corrections. This parameter-based approach allows the same transducer to be accurately leveled for different patients and positions without manual reconfiguration, improving both ease of operation and measurement precision
4Measurement precision
If frequent zeroing is performed to correct zero drift, then measurement accuracy is maintained, but productivity and time efficiency decrease
Solution Approach 1:
The system performs automatic zeroing at predetermined periodic intervals (e.g., every 8 hours) rather than requiring frequent manual interventions. The microprocessor automatically triggers the zeroing sequence at these intervals, maintaining measurement accuracy by correcting zero drift while minimizing disruption to clinical workflow. This periodic automated action balances measurement precision requirements with productivity concerns by eliminating the need for frequent manual zeroing
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 pressure monitoring without manual zeroing or leveling, reducing contamination risks and measurement errors, and allowing the transducer to be positioned anywhere, with automatic level correction during patient position changes or transportation.
Implementation Method 1
general pressure transducers are usually 'Wheatstone' bridge type
Implementation Method 2
pressure transducers are usually 'Wheatstone' bridge type
Implementation Method 3
a differential type amplifier circuit is usually used, amplifying the difference between the voltages applied to its inputs
Data Source
Figure 1~2
Figure 3~4
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 reference of virtual ground of pressure calculation, and the electronic level adjustment of transducer in relation to patient consists of offset, through software, of value in mmHg related to level difference in cmH2O informed by the user by means of monitor interface.