Venous Pressure Testing Apparatus Using Posture-Based Pulse Detection
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Solution Overview
Problem
Existing non-invasive venous pressure testing apparatuses are unable to quickly determine if central venous pressure is higher or lower than a certain reference value, which is a clinical necessity.
Innovation Solution
A venous pressure testing apparatus and method that estimate central venous pressure by measuring venous pulse using a sensor at a predetermined measurement position, assuming a particular posture where the water-gauge pressure corresponds to the vertical distance between the heart and a peak point of a vein, and comparing it to a reference venous pressure to determine if the pressure is lower than the reference value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If noninvasive venous pressure testing is performed using existing methods, then patient load is reduced compared to invasive catheter insertion, but the ability to quickly determine whether central venous pressure is higher or lower than a reference value is lost
Solution Approach 1:
The patent changes the parameter being measured from continuous pressure values to binary presence/absence of venous pulse. By detecting whether a venous pulse is present or absent at a specific measurement position when the patient is in a particular posture, the system quickly determines whether central venous pressure is above or below a reference value, providing rapid assessment without invasive procedures
Solution Approach 2:
The patent extracts only the essential information needed for clinical decision-making (whether pressure is above or below reference) from the complete pressure measurement. By focusing solely on detecting venous pulse presence/absence rather than measuring exact pressure values, the system achieves rapid assessment while maintaining noninvasive benefits
2Measurement precision
If complete venous pressure measurement is performed, then accurate pressure values are obtained, but the testing time and complexity increase
Solution Approach 1:
The patent extracts only the binary state (presence or absence of venous pulse) from the complete pressure measurement process. This extraction provides sufficient clinical information to determine whether pressure exceeds a reference value without requiring full quantitative measurement, thereby reducing testing time while maintaining diagnostic utility
Solution Approach 2:
The patent applies partial action by performing only the minimum necessary measurement (detecting venous pulse presence/absence) rather than complete pressure quantification. This partial measurement approach achieves the clinical goal of rapid pressure assessment without the time and complexity of full measurement protocols
Data Source
AI summary
A testing apparatus for estimating a central venous pressure by measuring a venous pulse by a sensor at a predetermined measurement position of a target person is equipped with an estimation unit which estimates that the central venous pressure of the target person is lower than a reference venous pressure if the venous pulse is not detected by the sensor at the predetermined measurement position of the target person who assumes a particular posture with which a water-gauge pressure corresponding to a vertical distance between the heart of the target person and a peak point, in the vertical direction, of a vein leading from the heart to the measurement position coincides with the reference venous pressure.