Blood Pressure Transducer with Reference Fluid for Hemodynamic Monitoring
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Solution Overview
Problem
Conventional hemodynamic monitoring systems experience measurement errors due to hydrostatic pressure changes caused by patient movement, leading to false alarms and requiring burdensome recalibration.
Innovation Solution
A blood pressure transducer with a differential pressure sensor and a reference tube filled with a reference fluid, which automatically corrects for hydrostatic pressure errors by measuring the difference between IV fluid and reference fluid pressures, eliminating the need for manual zero-point setting and allowing the transducer to be positioned anywhere.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional hemodynamic monitoring systems are used, then blood pressure can be monitored, but measurement errors occur due to hydrostatic pressure changes caused by patient movement
Solution Approach 1:
The patent introduces a reference fluid column as an intermediary element that experiences the same hydrostatic pressure changes as the patient's blood pressure. By measuring the pressure difference between the IV fluid (transmitting blood pressure) and the reference fluid (experiencing identical gravitational effects), the system eliminates measurement errors caused by patient movement and positioning changes.
Solution Approach 2:
The system changes the measurement parameter from absolute pressure to differential pressure. Instead of measuring absolute blood pressure directly, the differential pressure sensor measures the pressure difference between two fluid columns, one exposed to blood pressure and the other to reference pressure. This parameter transformation automatically compensates for hydrostatic variations.
2Measurement precision
If manual zero-point setting is required, then initial calibration can be performed, but frequent recalibration is needed due to patient movement
Solution Approach 1:
The differential pressure monitoring system performs self-calibration by continuously comparing the IV fluid pressure against the reference fluid pressure. The system automatically compensates for hydrostatic changes without requiring manual intervention or recalibration, as the reference fluid column inherently tracks gravitational effects on both sides of the measurement.
Solution Approach 2:
The reference fluid column continuously experiences and tracks hydrostatic pressure changes throughout the monitoring period. This continuous tracking eliminates the need for periodic recalibration, as the system maintains accurate differential pressure measurements regardless of patient position changes or movement.
3Ease of operation
If the transducer position is fixed, then hydrostatic pressure can be controlled, but the transducer cannot be moved without recalibration
Solution Approach 1:
The system creates an equipotential reference by using a reference fluid column that experiences identical gravitational potential changes as the patient's circulatory system. Both measurement channels (IV fluid and reference fluid) are subject to the same gravitational effects, making the differential measurement independent of absolute position or orientation.
Solution Approach 2:
The system transitions from a static calibration approach to a dynamic compensation approach. The reference fluid column dynamically adapts to position changes in real-time, automatically maintaining measurement accuracy regardless of transducer movement or patient repositioning.
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
This solution reduces measurement errors and eliminates the need for frequent recalibration, improving patient care by providing accurate blood pressure readings and saving time for medical professionals.
Implementation Method 1
measurement errors due to hydrostatic pressure changes caused by patient movement
Implementation Method 2
differential pressure sensor configured to generate an electrical signal based at least on a difference in pressure between an IV fluid in the first chamber and the reference fluid in the second chamber
Data Source
AI summary
Apparatus, systems, and methods for hemodynamic monitoring are provided. In some embodiments, the hemodynamic monitoring includes use of an IV fluid administered through a blood pressure transducer. The blood pressure transducer generates an electrical signal that is transmitted to a hemodynamic monitor to generate a blood pressure measurement. The blood pressure transducer may comprise a first chamber to receive and transmit an IV fluid, a second chamber connected to a reference tube and filed with reference fluid, and a pressure sensor configured to generate the electrical signal the blood pressure measurement is generated from.