Bubble CPAP Apparatus for Lung Volume Stabilization
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Solution Overview
Problem
Current respiratory assistance devices for premature infants are inadequate in maintaining gas exchange and lung stability, often requiring mechanical ventilation, which is costly, complex, and can exacerbate chronic lung disease, while existing CPAP devices fail to deliver sufficient gas volume due to limited frequency and amplitude of pressure oscillations.
Innovation Solution
A breathing assistance apparatus with a conduit submerged in a fluid, producing high-amplitude, low-frequency, broadband pressure oscillations with adjustable parameters to stabilize lung volumes and improve gas exchange, capable of being used via nasal prongs or endotracheal tube, and suitable for various respiratory conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional mechanical ventilators are used to provide CPAP, then mean airway pressure can be maintained to help open unstable alveoli, but the devices are complex, costly, and do not provide broadband oscillations in airway pressure
Solution Approach 1:
The patent extracts the essential CPAP function from complex mechanical ventilators by using a simple bubble CPAP device with a conduit submerged in fluid. This extraction approach maintains the core benefit of mean airway pressure support while eliminating the complexity, cost, and training requirements of full ventilator systems.
Solution Approach 2:
The patent creates a simplified copy of the ventilator CPAP function using basic components (conduit, fluid, gas source) that replicates the essential therapeutic effect of maintaining positive airway pressure without requiring the complex mechanical systems of traditional ventilators.
2Reliability
If high frequency oscillations are delivered to the airway, then lung stability is improved, but the amplitude and time duration of pressure waves are insufficient to deliver adequate gas volume
Solution Approach 1:
The patent employs dynamic adjustment of oscillation parameters (frequency, amplitude, time duration) to optimize both lung stability and gas delivery. The system can vary these parameters in real-time to match patient needs, ensuring adequate ventilation while maintaining lung stability through appropriate oscillation characteristics.
Solution Approach 2:
The patent changes multiple parameters of the pressure oscillations simultaneously - lowering frequency while increasing amplitude and time duration - to achieve the dual goal of maintaining lung stability and delivering sufficient gas volume to the patient's lungs.
3Quantity of substance
If broadband frequency oscillations are produced, then gas exchange is improved, but the amplitude of pressure oscillations is reduced
Solution Approach 1:
The patent uses periodic bubble generation at controlled intervals to create broadband frequency oscillations. The rhythmic release of gas bubbles through the submerged conduit produces a spectrum of frequencies that improve gas exchange while the periodic nature allows for sustained amplitude over time.
Solution Approach 2:
The patent maintains continuous gas flow and sustained pressure oscillations to ensure both broadband frequency effects for gas exchange and adequate amplitude for effective ventilation. The continuous operation prevents interruption of the therapeutic effect.
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 apparatus effectively stabilizes lung volumes and improves gas exchange by delivering high-amplitude, long-duration pressure oscillations, reducing the need for mechanical ventilation and enhancing respiratory support for premature infants and other patients with respiratory issues.
Implementation Method 1
By bubbling mechanical ventilator CPAP gases through a fluid with a simple conduit that is submersed vertically in the fluid, B-CPAP causes an infant's chest to vibrate at high frequencies
Implementation Method 2
The B-CPAP device used in the studies by Pillow et al., is described in U.S. Patent No. 6,805,120 entitled 'Breathing Assistance Apparatus.' Pillow et al. attributed the improved lung stability to the broadband frequency spectrum of oscillations in airway pressure produced by CPAP gas bubbles exiting the vertically oriented conduit submersed in water.
Data Source
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AI summary
It has been discovered that high amplitude, low frequency, broadband spectrum pressure oscillations of sufficient time duration can help stabilize lung volumes and improve gas exchange in a patient receiving ventilation assistance by helping to recruit and stabilize alveoli. A novel device is presented which can produce pressure oscillations having high amplitudes, a low broad-band frequency spectrum and long time duration. Additionally, the device can maintain a patient's mean airway pressure at one or more controlled levels. The device can control the oscillatory amplitude, frequency range and composition, time duration, and mean airway pressure levels by adjusting certain device parameters, such as the angle and depth of the device in a fluid. A device and mechanical system for remotely adjusting and measuring the angle of the device in a fluid are also disclosed. Furthermore, a device and system are disclosed that can deliver pressure oscillations having high amplitudes, a low broad-band frequency spectrum, long time duration, and multiple mean airway inspiratory and expiratory pressure levels. The device and system also provide means for controlling respiration timing in a patient, including: breaths per minute, inspiratory time, and the ratio of inspiratory to expiratory time.