Adaptive Ventilator Exhalation Control for CO2 Elimination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional CPAP therapy often results in carbon dioxide accumulation in exhaled air due to inconsistent pressure levels for inspiration and expiration, which may not be suitable for all patients, and existing solutions do not allow for individual adjustment of ventilation support with minimal equipment requirements.
Innovation Solution
A ventilator system that maintains a longer upper pressure level for spontaneous breathing and temporarily lowers to a shorter lower pressure level, with sensor-controlled transitions based on respiratory gas flow, pressure, and volume measurements to enhance exhalation volume and CO2 elimination, allowing for adaptive adjustment of the lower pressure level duration and frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a constant high pressure level is provided during CPAP therapy, then the patient can breathe spontaneously with adequate oxygenation, but carbon dioxide accumulates in the exhaled air due to insufficient exhalation volume
Solution Approach 1:
The patent applies periodic action by alternating between a high pressure level (Pinsp) for inspiration and a low pressure level (Pexsp) for expiration in a cyclic manner. The control unit switches between these two pressure levels based on detected breathing phases, creating a periodic pressure pattern that enables adequate CO2 elimination while maintaining spontaneous breathing capability.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the pressure level between high (Pinsp) and low (Pexsp) states. The control unit modifies the pressure parameter in response to detected expiratory flow rates, increasing pressure when expiratory flow is insufficient to enhance alveolar ventilation and CO2 elimination.
2Adaptability or versatility
If pressure levels are regularly changed for inspiration and expiration, then CO2 elimination is improved, but the therapy does not suit all patients and lacks individual adjustment capability
Solution Approach 1:
The patent applies self-service by enabling the ventilator to automatically adjust pressure levels based on real-time monitoring of the patient's breathing parameters. The control unit detects expiratory flow rates and autonomously determines when to switch between high and low pressure levels, eliminating the need for manual intervention or complex adjustment mechanisms while providing personalized therapy.
Solution Approach 2:
The patent implements feedback control by continuously monitoring expiratory flow rates and using this information to regulate pressure level transitions. The control unit adjusts the timing and duration of high and low pressure phases based on detected breathing patterns, creating a closed-loop system that adapts to individual patient needs without requiring additional equipment.
3Quantity of substance
If the lower pressure level duration is extended to increase exhalation volume, then CO2 elimination improves, but the inspiration time is reduced and may compromise oxygenation
Solution Approach 1:
The patent applies dynamics by making the duration of high and low pressure levels variable rather than fixed. The control unit dynamically adjusts the timing of pressure level transitions based on detected expiratory flow rates and breathing phase timing, optimizing the balance between exhalation volume and inspiration time for each individual patient's physiological needs.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a ventilator with a breathing gas source and a control unit configured to provide breathing gas for a first, longer period at an upper pressure level and to provide breathing gas for a second, shorter period at a lower pressure level, characterized in that the ventilator has sensors that at least temporarily detect measured values of the breathing gas (the flow and/or pressure and/or the volume of the breathing gas) and wherein the control unit controls the transitions between the pressure levels and the second period at least partially depending on the measured values.