Three-Channel Pulse Sensor for Accurate Non-Invasive Central Pressure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing non-invasive methods for measuring central arterial pressure suffer from high measurement errors, and invasive methods are limited by their invasive nature, high cost, and difficult operation.
Innovation Solution
A three-channel pulse wave signal sensor is used to measure central arterial pressure, comprising an upstream, midstream, and downstream channel, with the midstream channel inflating to block blood flow, allowing for accurate measurement by analyzing pulse wave signals and pressure variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If invasive catheter method is used to measure central arterial pressure, then measurement precision is improved, but ease of operation deteriorates and device complexity increases
Solution Approach 1:
The patent uses an inflatable airbag as an intermediary device to block blood flow in the brachial artery, allowing indirect measurement of central arterial pressure through pressure transmission from the aorta through the blocked vessel, avoiding direct catheter insertion while maintaining measurement accuracy
Solution Approach 2:
The patent replaces the mechanical invasive catheter system with a non-invasive pneumatic system using inflatable airbags and pressure sensors to achieve the same measurement function through fluid pressure transmission rather than direct mechanical contact with the aorta
2Measurement precision
If invasive catheter method is used to measure central arterial pressure, then measurement precision is improved, but cost increases
Solution Approach 1:
The patent employs disposable inflatable airbags and standard pressure sensors instead of expensive reusable catheter systems, reducing manufacturing costs while maintaining measurement functionality through single-use pneumatic blocking devices
Solution Approach 2:
The patent substitutes expensive medical-grade invasive measurement systems with cheaper non-invasive pneumatic pressure transmission systems using readily available airbags and pressure sensing technology
3Ease of operation
If non-invasive methods such as pulse wave analysis are used to measure central arterial pressure, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The patent introduces an inflatable airbag as a mediator to create a controlled blood flow blocking condition, transforming the measurement into a direct pressure transmission problem that can be solved with simple pressure sensors rather than complex pulse wave analysis algorithms
Solution Approach 2:
The patent changes the measurement parameter from indirect pulse wave characteristics to direct pressure values by using the airbag to equalize pressures, allowing straightforward pressure reading without complex signal processing or mathematical modeling
4Ease of operation
If non-invasive methods such as visual observation are used to measure central arterial pressure, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The patent replaces subjective visual observation with objective electronic pressure sensing, using pressure sensors to automatically record and display numerical pressure values instead of relying on operator visual assessment of waveform changes
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
The method provides accurate non-invasive measurement of central arterial pressure and other intraluminal pressures by minimizing the influence of blood flow and vascular elasticity, achieving precise systolic and diastolic pressure readings.
Implementation Method 1
inflating the airbag of the midstream strap, and acquiring and detecting pulse wave output signals of the upstream and downstream signal channels at the same time, till the blood flow in a brachial artery is stopped, i.e., the pulse wave output signal of the downstream signal channel is zero; logging the air pressure value of the midstream strap airbag at this time, inflating the airbag of the midstream strap further, and monitoring the air pressure of the midstream strap, till the air pressure of the midstream strap is greater than the logged air pressure value by 10-100 mmHg
Data Source
AI summary
Provided are method and device for non-invasive detection of central arterial pressure and other intraluminal large arterial pressures. Blood flow and vascular elasticity are the main factors affecting pulse waveform acquisition. A midstream airbag strap can be positioned at the same level as an intraluminal large artery in a human body, and an upstream signal channel can be positioned close to the trunk of the human body and thus is very close to the intraluminal large artery so that the influence of the vascular elasticity is minimized. On the basis of the relationship between the pressure in a blood vessel and the pressure of the airbag strap outside the blood vessel under the condition that the width of the midstream airbag strap is sufficient.