Noninvasive Blood Pressure Tracking via Oscillometric Cuff
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Solution Overview
Problem
Current non-invasive blood pressure measurement devices are either too complex, expensive, slow, or inaccurate for repeated and fast measurements, which is a limitation in assessing CPR quality and hemodynamic stability, especially during cardiac arrest and emergency care.
Innovation Solution
A blood pressure measurement device that applies external pressure cyclically to detect and track diastolic, mean, and systolic blood pressures using a pressure control unit and detector unit, allowing for fast and accurate measurement by changing pressure until specific physical characteristics are detected and measured.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If invasive blood pressure catheters are used, then measurement precision is improved, but device complexity and patient risk increase
Solution Approach 1:
The patent replaces the mechanical invasive catheter system with a non-invasive oscillometric measurement system. The device uses external pressure oscillations applied to a body part (e.g., cuff inflation/deflation) to detect blood pressure through pressure-sensitive elements, eliminating the need for vascular insertion while achieving accurate measurements of systolic, diastolic, and mean blood pressure.
Solution Approach 2:
The patent introduces an intermediary oscillating pressure mechanism between the measurement device and the blood vessel. By applying controlled external pressure oscillations through a cuff or pressure providing device, the system indirectly detects blood pressure parameters without direct vascular contact, using the intermediary pressure field to transmit mechanical information from the pulsating vessel.
2Device complexity
If traditional non-invasive devices are used, then device complexity is reduced, but measurement speed and accuracy deteriorate
Solution Approach 1:
The patent employs periodic oscillations of external pressure applied to the body part at frequencies higher than the pulse rate. This periodic action enables multiple measurements to be taken during a single inflation-deflation cycle, significantly increasing measurement speed while maintaining device simplicity. The oscillations allow the device to capture multiple blood pressure data points rapidly without requiring multiple slow cycles.
Solution Approach 2:
The patent performs preliminary characterization of the pressure-volume response of the compressed structure before final blood pressure determination. By pre-establishing the compliance curve and identifying key pressure points through initial oscillations, the device can rapidly determine blood pressure parameters in subsequent measurements, improving speed while keeping the device simple.
3Device complexity
If manual palpation is used to detect ROSC, then device complexity is minimized, but measurement reliability and speed worsen
Solution Approach 1:
The patent replaces manual tactile palpation with an automated oscillometric detection system. Pressure-sensitive elements objectively measure pressure oscillations in the blood vessel, providing reliable ROSC detection based on quantifiable mechanical signals rather than subjective clinician perception. This substitution eliminates human error and provides consistent, objective measurements.
Solution Approach 2:
The patent implements feedback mechanisms where the detected pressure oscillations and blood pressure parameters are continuously monitored and used to assess ROSC. The system provides real-time feedback on hemodynamic status, allowing objective determination of return of spontaneous circulation based on measured physiological parameters rather than intermittent manual checks.
4Productivity
If fast repeated measurements are performed, then productivity is improved, but measurement precision and reliability may worsen
Solution Approach 1:
The patent uses periodic oscillations at controlled frequencies to perform rapid repeated measurements. By oscillating the external pressure at specific frequencies higher than the pulse rate, the device can complete multiple measurement cycles quickly while maintaining precision through consistent, repeatable measurement conditions established by the periodic action.
Solution Approach 2:
The patent applies beforehand cushioning by establishing a baseline pressure-volume relationship and compliance curve before rapid measurements begin. This preliminary characterization cushions against variability in subsequent fast measurements, allowing the device to rapidly track blood pressure changes while maintaining precision through reference to the pre-established mechanical properties of the compressed structure.
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 rapid and objective tracking of blood pressure features, improving CPR assessment and hemodynamic stability monitoring without the need for invasive methods, facilitating timely interventions.
Implementation Method 1
applying extrinsic pressure oscillations. Pressure-volume response of the compressed structure is obtained and compartment pressure is estimated as the extrinsic pressure at which compressed structure has the highest compliance
Data Source
AI summary
A device is configured for tracking e.g. the diastolic blood pressure in a patient. The device applies a pressure to a body part, e.g. by use of an inflatable cuff. By performing repeated and alternating pressure changes in the cuff, a specific feature of a signal that relates to the diastolic blood pressure can be tracked and possibly measured. The device may have particular use in conjunction with cardiopulmonary resuscitation devices.