Respiratory Gas Sensor Attachment Asymmetry
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Solution Overview
Problem
Existing respiratory gas sensors face challenges in accurately detecting CO2 concentration during both invasive and non-invasive positive pressure ventilation due to compatibility issues with different airway adaptors, leading to potential interference and reduced measurement accuracy.
Innovation Solution
A sensor attachment system comprising a respiratory gas sensor with engagement and attachment preventing portions, and a compatible airway adaptor with accommodation portions, ensuring the sensor is attachable only to compatible adaptors, preventing interference and ensuring accurate CO2 detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the respiratory gas sensor is made compatible with all types of airway adaptors (both invasive and non-invasive), then the adaptability of the sensor is improved, but the measurement precision of CO2 concentration deteriorates due to interference with incompatible adaptors
Solution Approach 1:
The sensor and airway adaptor are designed with asymmetric engagement features including protrusions and recesses that only match between compatible pairs. The sensor has a specific engagement portion geometry that corresponds to matching recesses in compatible airway adaptors, preventing attachment to incompatible adaptors while maintaining broad compatibility within the compatible group.
Solution Approach 2:
An engagement portion acts as an intermediary mechanism between the sensor and airway adaptor. This engagement portion includes protrusions that fit into corresponding recesses, serving as a mediator that ensures proper alignment and prevents interference while maintaining measurement precision. The intermediary structure enables selective compatibility without requiring the sensor to be physically different for each application type.
2Ease of operation
If the sensor is designed to attach to all airway adaptors, then the ease of operation is improved, but harmful interference occurs between the sensor and incompatible airway adaptors
Solution Approach 1:
The attachment mechanism uses asymmetric protrusion-recess geometry that naturally guides the sensor to compatible airway adaptors through shape complementarity. This asymmetric design provides intuitive ease of operation for compatible pairs while automatically preventing attachment to incompatible adaptors, eliminating harmful interference without requiring complex locking mechanisms or operator training.
3Device complexity
If the sensor is made universally compatible, then the device complexity is reduced, but the reliability of measurement deteriorates due to potential interference
Solution Approach 1:
The sensor maintains a single unified design with asymmetric engagement features rather than requiring different sensor models for different applications. This asymmetric geometry provides inherent compatibility control through shape matching, reducing device complexity while ensuring measurement reliability by preventing attachment to incompatible airway adaptors that could cause interference.
Data Source
AI summary
A sensor attachment system includes: a sensor configured to detect a state of respiratory gas of a subject; and a compatible airway adaptor compatible with the sensor. The sensor includes a respiratory gas detector configured to detect the state of the respiratory gas of the subject, and a sensor-side engagement portion engageable with the compatible airway adaptor. The compatible airway adaptor includes a tube portion having a respiratory gas ventilation passage through which the respiratory gas passes, and an adapter-side engagement portion engageable with the sensor-side engagement portion. The sensor is attachable to the compatible airway adaptor in a state in which the compatible airway adaptor and the sensor do not interfere with each other, and the sensor is not attachable to an incompatible airway adaptor that is not compatible with the sensor in a state in which the incompatible airway adaptor and the sensor interfere with each other.