CO2 Inhalation Device for Central Sleep Apnea
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Solution Overview
Problem
Current carbon dioxide inhalation treatments for central sleep apnea are ineffective due to difficulties in titrating and maintaining the concentration of inspired CO2, causing discomfort and inadequate correction of sleep apnea, especially in heart failure patients, as existing devices rely on airflow sensors and thoracoabdominal bands that are uncomfortable and lack real-time CO2 titration capabilities.
Innovation Solution
A carbon dioxide inhalation treatment device comprising a blower, gas cylinder, mixing chamber, mask, and detection mechanism using EEG and EMG recording electrodes to determine the optimal CO2 concentration, ensuring stable and moderate CO2 delivery without causing arousal, featuring a loosely connected mask and alarm system for safety, and a flow meter for precise CO2 adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the concentration of inhaled carbon dioxide is increased to effectively correct central sleep apnea, then the therapeutic effect is improved, but the risk of causing arousal and aggravating the condition increases
Solution Approach 1:
The patent employs a feedback control system using a capnograph to continuously monitor end-tidal CO2 levels and adjust the CO2 concentration delivered to the patient in real-time. This closed-loop feedback mechanism ensures that the therapeutic effect is maintained while preventing excessive CO2 concentration that could cause arousal, thus resolving the contradiction between effectiveness and safety.
Solution Approach 2:
The system dynamically adjusts the concentration parameter of inhaled CO2 based on real-time physiological monitoring. By changing the CO2 concentration parameter adaptively rather than using fixed high concentrations, the system achieves effective correction of central sleep apnea while staying below the threshold that triggers arousal, thereby resolving the contradiction.
2Measurement precision
If traditional airflow sensors and thoracoabdominal bands are used to detect apnea, then apnea detection capability is achieved, but patient comfort deteriorates and sleep is affected
Solution Approach 1:
The patent extracts and eliminates the uncomfortable components (thoracoabdominal bands and nasal airflow sensors) from the detection system. Instead, it uses only the capnograph to monitor CO2 levels and detect apnea events, thereby maintaining measurement precision while significantly improving patient comfort and sleep quality.
Solution Approach 2:
The patent replaces the mechanical detection system (bands and sensors that physically contact and constrain the patient) with a gas analysis-based detection system using capnography. This substitution eliminates the mechanical discomfort while preserving the ability to detect apnea events through physiological parameter monitoring.
3Manufacturing precision
If real-time titration of CO2 concentration is implemented to maintain optimal therapeutic levels, then treatment precision is improved, but device complexity increases
Solution Approach 1:
The patent uses a feedback control system where the capnograph continuously monitors end-tidal CO2 levels and provides real-time information to adjust the CO2 concentration delivered. This feedback mechanism enables precise titration of CO2 levels without requiring overly complex manual adjustment mechanisms, as the system self-regulates based on monitored physiological parameters.
Solution Approach 2:
The system performs automatic self-adjustment of CO2 concentration based on real-time capnographic monitoring. The device monitors its own output and automatically titrates the CO2 delivery to maintain optimal therapeutic levels, eliminating the need for complex external control mechanisms and reducing overall system complexity while maintaining high precision.
Data Source
AI summary
The present invention discloses a carbon dioxide inhalation treatment device for central sleep apnea comprising a blower, a gas cylinder filled with carbon dioxide (CO2), an airbag, a mask, and a detection mechanism for detecting the central apnea by measuring the electromyographic activity of the chest wall muscles. The mask is provided with multiple holes providing a communication between the inside and outside of the mask in order to prevent any sense of resistance of breathing and to provide greater control of inspired CO2. Inspired CO2 from a gas mixture containing also a minimum 20% O2 is driven by air using a blower into a mixing chamber. This carbon dioxide inhalation treatment device for central sleep apnea can provide a stable, mild level of carbon dioxide for patients with central sleep apnea, thus by preserving respiratory drive correcting central sleep apnea without increasing the arousal and microarousal frequency.