Spirographic Device Inhaled Gas Dead Space Evaluation
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Solution Overview
Problem
Current spirographic and gas exchange methods fail to provide accurate and sufficient information for reliable diagnosis and ventilation, particularly due to the lack of consideration for apparatus dead space, which affects breathing efficiency and can lead to lung damage.
Innovation Solution
The method involves measuring the concentration of breathing gas during inhalation to determine apparatus dead space, combining this with existing techniques for airway and alveolar dead space analysis, and synchronizing exhaled and inhaled spirographic data to improve accuracy, using mathematical operations and suitable apparatus to calculate ventilation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only expired breathing gas is measured for spirographic analysis, then the measurement process is simple, but the obtained information is insufficient and inaccurate for reliable diagnosis and ventilation
Solution Approach 1:
The patent combines measurement of both expired and inhaled breathing gas into a unified spirographic analysis system. By integrating the inhaled gas measurement (which reveals apparatus dead space) with the traditional expired gas measurement, the system achieves comprehensive respiratory assessment without requiring separate measurement processes, thus improving accuracy while maintaining operational simplicity
2Reliability
If apparatus dead space is not accounted for in ventilation schemes, then the ventilation setup is simple, but lung damage may occur due to inadequate breathing efficiency
Solution Approach 1:
The patent performs preliminary determination of apparatus dead space by analyzing the inhaled portion of the spirogram before implementing ventilation schemes. This advance measurement allows clinicians to account for the apparatus dead space volume in advance when setting up ventilation parameters, preventing lung damage by ensuring adequate tidal volumes are delivered, without requiring complex real-time adjustments during ventilation
3Measurement precision
If traditional spirographic methods are used without inhaled gas analysis, then the evaluation process is straightforward, but ventilation efficiency cannot be accurately determined
Solution Approach 1:
The patent segments the spirographic analysis into two distinct components: analysis of the expired portion (for traditional respiratory parameters) and analysis of the inhaled portion (for apparatus dead space determination). This segmentation allows each component to be measured and evaluated independently using appropriate methods, making the overall process more manageable while achieving comprehensive and accurate ventilation efficiency assessment
Data Source
AI summary
The invention provides a method for obtaining and evaluating spirographic and gas exchange data, involving measuring a concentration of a breathing gas gc(Vx) for a plurality of volumes Vx of breathing gas mix, wherein the measuring is performed on inhaled breathing gas mix, further involving determining an apparatus dead space ApDS, of breathing gas mix in the apparatus not taking part in gas exchange, by evaluating the measured concentrations gc(Vx) as a function of the volume V of the inhaled breathing gas mix. The use of inhaled breathing gas mix allows to determine the apparatus dead space, which is an important parameter when evaluating ventilation efficiency and the like. Furthermore, the invention provides a method in which inhalation and exhalation parts of a spirogram are synchronized, by matching features thereof, in order to further improve the accuracy of gas exchange volumes and derived data. Finally, the invention provides a spirographic device and a patient ventilation apparatus, incorporating the present method.