Wheeze Sensor Vent Structure for Noise-Resistant Detection
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Solution Overview
Problem
Existing wheeze detection devices face challenges in enhancing sealability to improve measurement sensitivity while preventing noise interference from semiconductor elements due to internal pressure fluctuations, which can incorrectly detect wheezing.
Innovation Solution
A wheeze detection device with a sound measurement element connected to the atmosphere via a hole portion with branch portions, preventing sudden internal pressure fluctuations and enhancing sealability and sound insulation to improve detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the space accommodating the sound detector is fully sealed to improve measurement sensitivity, then the measurement sensitivity of biological sound is improved, but sudden internal pressure fluctuations occur causing noise from the sound measurement element
Solution Approach 1:
The hole portion is divided into multiple branched hole portions that extend in different directions from the branch portion. This segmentation allows pressure equalization through multiple pathways while maintaining sound insulation, resolving the contradiction between measurement sensitivity and noise prevention.
Solution Approach 2:
The accommodation space has different sealing characteristics in different regions: the cover member and space-forming member provide high sealing, while the branched hole portions provide localized pressure equalization pathways. This local quality differentiation allows simultaneous achievement of sound insulation and noise suppression.
2Measurement precision
If the degree of sealing of the space is increased to improve detection accuracy, then the measurement sensitivity is improved, but the sound measurement element generates noise due to internal pressure fluctuations
Solution Approach 1:
The branched hole portions act as intermediaries between the accommodation space and the external environment. They provide a controlled pathway for pressure equalization that filters out harmful noise while allowing necessary pressure changes, thus mediating between detection accuracy and noise interference.
Solution Approach 2:
The hole portion extends in multiple dimensions through the space-forming member with branched portions in different directions. This multi-dimensional configuration provides pressure equalization pathways that are acoustically isolated from the sound measurement element, resolving the contradiction in a spatial dimension.
3Object-generated harmful factors
If the hole portion is made larger to prevent pressure fluctuations, then noise is suppressed, but sound insulation from the atmosphere side is reduced
Solution Approach 1:
The hole portion is segmented into multiple small branched hole portions instead of one large hole. This segmentation maintains effective pressure equalization area while reducing acoustic coupling with the external environment, thus suppressing noise while maintaining sound insulation.
Solution Approach 2:
The branched hole portions are nested within the space-forming member structure, with the hole portion extending from the inlet through the space-forming member to the outlet. This nesting allows the hole portion to be integrated into the sealed structure, providing pressure equalization without compromising overall sound insulation.
Data Source
AI summary
A wheeze detection device that allows suppressing a noise and improving detection accuracy of wheezing. The device includes a first microphone configured by a MEMS microphone, a space-forming member (a first housing, an O-ring, a flexible circuit board, and a second housing) forming an accommodation space that accommodates the first microphone, and a housing cover that forms a pressure receiving unit that closes the accommodation space and receives a pressure from a body surface. The space-forming member has a hole portion connected to an atmosphere. The accommodation space is connected to the atmosphere via the hole portion. The hole portion includes branch portions to between a groove and a terminal and two branched hole portions branched at each branch portion from a side of the groove. One branched hole portion among the two branched hole portions is connected to the terminal. The other branched hole portion is closed.