Phrenic Nerve Stimulation Timing for Sleep Apnea Airway Patency
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Solution Overview
Problem
Existing treatments for Obstructive Sleep Apnea (OSA) are inadequate as they fail to effectively maintain airway patency during sleep due to insufficient reflex responses and neuromuscular activity, particularly in patients with compromised anatomy, leading to airway collapse and associated health issues.
Innovation Solution
The use of an implantable device to stimulate the phrenic nerve, leveraging the negative pressure reflex (NPR) to trigger rapid diaphragmatic contractions, synchronizing with the respiratory cycle to maintain airway patency by enhancing afferent feedback and efferent muscle contractions, thereby stabilizing the airway.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phrenic nerve stimulation is used to increase lung volume and stiffen the airway, then airway patency is improved, but patient comfort deteriorates due to sleep disturbance
Solution Approach 1:
The patent applies periodic phrenic nerve stimulation synchronized with the patient's natural respiratory cycle. By delivering stimulation pulses at specific phases of breathing (during inspiration or early expiration), the system maintains airway patency through rhythmic diaphragmatic contractions that increase lung volume and stiffen the airway, while avoiding continuous stimulation that would cause discomfort and sleep disturbance. This periodic approach leverages the body's natural breathing patterns to minimize adverse effects.
2Reliability
If continuous phrenic nerve stimulation is applied to maintain airway openness, then airway stability is improved, but energy consumption increases and patient tolerance decreases
Solution Approach 1:
The system employs periodic stimulation delivered in synchronized bursts rather than continuous stimulation. The controller detects the patient's respiratory phase and delivers phrenic nerve stimulation only during specific windows (inspiration or early expiration), allowing the airway to remain stable through rhythmic reinforcement while minimizing overall energy consumption. This approach maintains airway stability with intermittent stimulation rather than constant energy input.
Solution Approach 2:
The system incorporates feedback mechanisms where the controller monitors respiratory phase and adjusts stimulation timing accordingly. By detecting the patient's natural breathing cycle and synchronizing stimulation delivery to optimal phases, the system maximizes airway stabilizing effects while minimizing energy waste. The feedback loop ensures stimulation is delivered only when most effective, avoiding unnecessary energy consumption during phases when airway support is not needed.
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
This approach effectively prevents airway collapse during sleep by maintaining airflow and oxygen saturation, reducing apnea events, and enhancing sleep quality without arousing the patient, thus addressing the limitations of existing therapies.
Implementation Method 1
The use of an implantable device to stimulate the phrenic nerve, leveraging the negative pressure reflex (NPR) to trigger rapid diaphragmatic contractions
Data Source
AI summary
Techniques for addressing sleep disorders are provided. A system includes a nerve stimulator that is configured to deliver stimulation energy to a nerve of a sleeping patient. A system includes a sensor for gather data from the sleeping patient and a controller for processing the data. The controller is configured to cause the stimulation energy that is provided to be adjusted based on the sensed data.