Venous Pressure Measurement Using Stepwise Cuff Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing non-invasive venous pressure measurement methods lack accuracy due to limited pressure change increments and susceptibility to noise in pulse wave detection, and fail to monitor venous pressure changes over time.
Innovation Solution
A venous pressure measurement apparatus with a pressure controller that applies pressure in multiple stepwise increments or decrements, combined with a pulse wave detector and a calculating section that uses multiple measurement steps to calculate venous pressure based on pulse wave amplitudes, while also accounting for noise reduction and temporal changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pressure is changed in stepwise increments of about 5 mmHg, then the measurement can be performed with a simple configuration, but the accuracy of the calculated venous pressure is insufficient
Solution Approach 1:
The measurement process is divided into multiple measurement steps, where the pressure is changed in stepwise increments and pulse waves are detected at each step. This segmentation allows for multiple samples to be collected across different pressure levels, improving accuracy without requiring complex equipment. The pulse wave detection is performed at multiple discrete pressure points rather than continuously, maintaining simplicity while gathering sufficient data for accurate calculation.
Solution Approach 2:
The patent performs more measurements than the minimum single measurement by conducting multiple measurement steps at different pressure levels. This excessive action (multiple measurements instead of one) provides redundant data points that improve accuracy through statistical processing, allowing the system to overcome noise and obtain a more reliable venous pressure value.
2Device complexity
If pulse wave detection signals with small signal components are used, then the measurement can be performed with a simple cuff-based system, but the calculated venous pressure is highly susceptible to noise
Solution Approach 1:
The detection process is segmented into multiple measurement steps, each capturing pulse wave signals at different pressure levels. By dividing the measurement into discrete steps rather than relying on a single continuous measurement, the system collects multiple independent samples that can be processed to reduce noise impact.
Solution Approach 2:
The system uses feedback by comparing pulse wave signals across multiple measurement steps and using this information to calculate the venous pressure. The calculation process incorporates feedback from all measurement steps, allowing the system to identify and compensate for noisy measurements by relying on the pattern of responses across multiple pressure levels.
3Loss of time
If a single measurement is performed, then the measurement process is simple and quick, but the temporal change of venous pressure cannot be monitored
Solution Approach 1:
The measurement process is segmented into multiple sequential measurement steps performed over time. Each step captures venous pressure information at a different time point, allowing the system to monitor temporal changes while maintaining a relatively simple and quick overall process. The segmentation in time domain enables dynamic monitoring without excessive complexity.
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
Improves the accuracy of venous pressure measurement by increasing the number of pulse wave amplitude samples and reducing noise influence, allowing for more precise and time-sensitive monitoring of venous pressure changes.
Implementation Method 1
a pulse wave detector configured to detect pulse waves from a pressure the cuff receives from the portion of the body
Data Source
AI summary
A venous pressure measurement apparatus includes a pressure controller configured to change a pressure applied from a cuff to a portion of a body where a vein and an artery exist and to which the cuff is attached, a pulse wave detector configured to detect pulse waves from a pressure the cuff receives from the portion of the body, and a venous pressure calculating section configured to calculate a venous pressure based on the applied pressure and the pulse waves detected by the pulse wave detector during a period in which the applied pressure is changed. The pressure controller is configured to execute a plurality of measurement steps, the applied pressure being increased or reduced from an initial value in each of the measurement steps.