Neonatal CO2 Detector Minimizing Internal Volume
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Solution Overview
Problem
Existing airway adapters for neonatal patients have a significant void volume, which affects the accuracy of colorimetric carbon dioxide detectors, especially in low birth weight patients, due to excessive internal volume and gas mixing, leading to inadequate detection of end-tidal carbon dioxide.
Innovation Solution
A neonatal colorimetric carbon dioxide detector with a pH-sensitive colorimetric membrane and a design that minimizes internal volume by partially occluding the respiration equipment orifice and overlapping patient and respiration orifices, reducing the total internal volume to less than 3.8 mL before circuit attachment and adding less than 1 mL when inserted, ensuring accurate CO2 detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing airway adapters are used with neonatal patients, then the device structure is simple and easy to manufacture, but the internal volume is too large causing excessive gas mixing and inaccurate CO2 detection
Solution Approach 1:
The airway adapter is divided into multiple functional segments: a patient interface portion, a colorimetric detector portion, and a respiration equipment interface portion. Each segment is optimized independently, with the detector portion having minimal internal volume while the other portions maintain necessary structural functions. This segmentation allows reducing the overall internal volume to less than 3.8 mL while preserving manufacturing simplicity.
Solution Approach 2:
The colorimetric detector membrane is nested within a compact enclosure that is itself nested within the airway adapter structure. The respiration equipment orifice is partially occluded by the enclosure, creating a nested configuration that minimizes internal volume. This nesting approach reduces the internal volume to less than 3.8 mL before circuit attachment and adds less than 1 mL when inserted, while maintaining ease of manufacture through integrated molding.
2Measurement precision
If the internal volume is reduced to improve CO2 detection accuracy, then measurement precision improves, but device complexity increases
Solution Approach 1:
The colorimetric detector, patient interface, and respiration equipment interface are merged into a single integrated airway adapter unit. The enclosure housing the colorimetric membrane is integrated with the patient and equipment interface portions, eliminating the need for separate components. This merging reduces device complexity while maintaining the reduced internal volume necessary for accurate CO2 detection in low birth weight neonatal patients.
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 solution effectively reduces the internal volume of the detector, enhancing the accuracy of CO2 detection in low birth weight neonatal patients by minimizing gas mixing and maintaining the integrity of the colorimetric membrane, thereby ensuring correct airway tube insertion.
Implementation Method 1
a colorimetric carbon dioxide detector membrane having a pH-sensitive chemical indicator that undergoes colorimetric change in the presence of carbon dioxide
Data Source
AI summary
A neonatal colorimetric carbon dioxide detector has a colorimetric carbon dioxide detector membrane having a pH-sensitive chemical indicator that undergoes colorimetric change in the presence of carbon dioxide. The detector has a patient orifice in fluid communication with the baby's airway and a respiration equipment orifice connected to a breathing system. The patient orifice is connected to a breathing tube and when the breathing tube is inserted correctly into the trachea, as the baby exhales, carbon dioxide interacts with the colorimetric membrane which changes color based upon the concentration of carbon dioxide. The internal volume of the neonatal colorimetric carbon dioxide detector is reduced to properly function with low-birth-weight (neonatal) infants.