Blood Pressure Airbag Nozzle Layout to Prevent Sensor Airflow Interference
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Solution Overview
Problem
Wearable devices with blood pressure measurement functions face accuracy issues due to airflow interference between the air supply and detection ports, which affect the precision of blood pressure measurements.
Innovation Solution
The device incorporates a fluid pipeline system where the nozzles of the fluid pump and pressure sensor are positioned to avoid direct airflow impact by having one nozzle extend into the airbag and the other nozzle located on the airbag's inner wall, with a specific spacing maintained to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the fluid pump and pressure sensor are disposed in parallel with parallel airflow channels, then the device structure is simple and compact, but airflow impact occurs during measurement which interferes with sensor measurement and affects measurement accuracy
Solution Approach 1:
The patent applies asymmetry by changing the relative positions and opening directions of the nozzles. Specifically, the fluid pump nozzle and pressure sensor nozzle are positioned asymmetrically on the airbag, with their opening directions oriented away from each other. This asymmetric arrangement prevents the fluid pump's airflow from directly impacting the pressure sensor nozzle, thereby eliminating measurement interference while maintaining a compact device structure.
Solution Approach 2:
The patent resolves the contradiction by transitioning from a two-dimensional parallel arrangement to a three-dimensional spatial configuration. The nozzles are positioned at different locations on the airbag surface with different opening directions, utilizing spatial dimensionality to separate the airflow paths. This dimensional change allows both nozzles to be close to the airbag (maintaining compactness) while preventing airflow interference (improving measurement accuracy).
2Volume of moving object
If the spacing between ports of airflow channels is reduced to make the device compact, then the device becomes more portable, but airflow impact occurs which interferes with measurement
Solution Approach 1:
The patent applies local quality by optimizing the specific positioning and orientation of the nozzles on the airbag. Instead of uniformly distributing components, the nozzles are strategically positioned at specific locations with specific opening directions. This localized optimization ensures that the fluid pump nozzle does not directly face the pressure sensor nozzle, eliminating airflow impact while maintaining minimal spacing between components for device compactness.
3Device complexity
If the nozzles are positioned close to the airbag for compact structure, then the device is miniaturized, but the nozzle may be directly impacted by fluid supply affecting detection accuracy
Solution Approach 1:
The patent uses asymmetry to position the nozzles such that their opening directions are oriented away from each other. The fluid pump nozzle and pressure sensor nozzle are placed at asymmetric locations on the airbag, ensuring that the fluid supply airflow does not directly impact the pressure sensor nozzle. This asymmetric configuration maintains structural compactness while protecting detection accuracy.
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
This design enhances measurement accuracy by reducing airflow interference, allowing for precise blood pressure detection with minimal impact on the pressure sensor, while also facilitating a compact and portable device structure.
Implementation Method 1
a pressure sensor, configured to detect the pressure in the airbag
Implementation Method 2
a fluid pump configured to supply air to the airbag
Data Source
AI summary
An electronic device for measuring blood pressure includes a measurement assembly, an airbag, and a fluid pipeline, where a fluid pump and a pressure sensor in the measurement assembly are connected to the airbag through a first fluid pipeline and a second fluid pipeline respectively, a first nozzle in the first fluid pipeline and a second nozzle in the second fluid pipeline are located on a same side of the airbag, and an opening direction of one of the first nozzle and the second nozzle is away from that of the other, so that the first nozzle and the second nozzle are away from each other. This reduces impact on the pressure sensor caused by airflow in the airbag, and improves blood pressure measurement accuracy.