Circulatory Dynamic Measuring Apparatus for Heart Contraction Function
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Solution Overview
Problem
Current methods for measuring Pulse Wave Transit Time (PWTT) are influenced by blood pressure and vascular resistance, making it difficult to accurately assess the heart contraction function, specifically the Pre-Ejection Period (PEP), which is essential for cardiac function evaluation.
Innovation Solution
A circulatory dynamic measuring apparatus and method that acquires an electrocardiogram and pulse waves from both the upper arm and fingertip, calculating the Pulse Wave Transit Time (PWTT) to isolate the heart contraction function by using the Pulse Wave Transit Time from the cuff (PWTTCF) and fingertip (PWTTFT), allowing for the separation of blood pressure and vascular resistance effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PWTT is measured to assess blood pressure, then blood pressure information can be obtained, but the measurement value is affected by blood pressure and vascular resistance, making it impossible to clearly acquire a change in the PEP
Solution Approach 1:
The patent segments the PWTT measurement into two separate measurements: one in the upper arm (PWTTCF) and one in the fingertip (PWTTFT). By dividing the measurement into these two segments and calculating their difference, the patent isolates the PEP component from the confounding effects of blood pressure and vascular resistance, thereby improving PEP measurement accuracy.
2Loss of information
If PWTT measurement is performed using related art methods, then blood pressure can be determined, but the influence of blood pressure on PWTT prevents clear acquisition of PEP changes
Solution Approach 1:
The patent extracts the PEP information from the PWTT measurement by taking out the upper arm pulse wave transit time (PWTTCF) component from the overall PWTT measurement. By measuring and subtracting PWTTCF from the total PWTT, the patent isolates and extracts the pure PEP signal, preventing loss of cardiac function information.
3Measurement precision
If a single PWTT measurement is taken, then the measurement process is simple, but it cannot separate the effects of blood pressure and vascular resistance from heart contraction function
Solution Approach 1:
The patent implements a multi-functional measurement system that simultaneously measures multiple physiological parameters: blood pressure (via PWTT), PEP (via PWTTCF), and vascular resistance (via PWTTFT). By making the measurement system universal and capable of performing multiple functions with a single integrated apparatus, the patent achieves accurate cardiac function assessment without proportionally increasing device 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
Enables clear measurement of heart contraction function information simultaneously with blood pressure measurement, facilitating early detection of heart failure by providing a non-invasive index of cardiac function through display images showing time transitions of PWTTCF and blood pressure values.
Implementation Method 1
an electrocardiogram acquiring section which is configured to acquire an electrocardiogram of a subject
Implementation Method 2
a pulse wave acquiring section which is configured to acquire a pulse wave of an upper arm of the subject
Implementation Method 3
a calculator which is configured to calculate information that relates to a cardiac function of the subject, and that is based on a pulse wave transmit time obtained from the electrocardiogram and the pulse wave
Data Source
AI summary
A circulatory dynamic measuring apparatus includes: an electrocardiogram acquiring section which is configured to acquire an electrocardiogram of a subject; a pulse wave acquiring section which is configured to acquire a poise wave of an upper arm of the subject; and a calculator which is configured to calculate information that relates to a cardiac function of the subject, and that is based on a pulse wave transmit time obtained from the electrocardiogram and the pulse wave.