Nasal High Flow Therapy Flow Setting via Peak Inspiratory Flow
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Solution Overview
Problem
Current methods for setting flow rates in nasal high flow therapy systems often result in inappropriate flow rates, either too high or too low, leading to inadequate oxygen delivery or increased patient breathing work, due to the need for trial and error and lack of precision in determining the optimal setting based on patient-specific inspiratory demands.
Innovation Solution
Determining the flow setting for nasal high flow therapy by measuring the peak inspiratory flow during a spontaneous breathing mode in mechanical ventilation, allowing for precise adjustment to deliver the desired fraction of inspired oxygen (FiO2) while minimizing backpressure and patient discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If trial and error method is used to determine flow setting, then the system can eventually achieve desired FiO2, but the time required and patient discomfort increase
Solution Approach 1:
The patent applies preliminary action by measuring the patient's peak inspiratory flow during mechanical ventilation before transitioning to NHF therapy. This pre-measurement allows the NHF flow setting to be determined in advance based on actual patient demand data, eliminating the need for trial-and-error adjustments after therapy initiation.
Solution Approach 2:
The patent uses feedback by utilizing the peak inspiratory flow measurement from mechanical ventilation as input data to automatically determine the appropriate NHF flow setting. This feedback loop ensures the flow setting is based on actual patient respiratory demand rather than estimation or trial and error.
2Reliability
If high flow setting is used to ensure adequate oxygen delivery, then FiO2 requirement is met, but patient breathing work and discomfort increase
Solution Approach 1:
The patent applies parameter changes by setting the NHF flow rate based on the measured peak inspiratory flow parameter from mechanical ventilation. This dynamic parameter adjustment ensures the flow is high enough to meet oxygen delivery requirements but not excessively high to cause increased breathing work or discomfort.
3Object-affected harmful factors
If low flow setting is used to minimize patient discomfort, then breathing work is reduced, but adequate FiO2 delivery cannot be ensured
Solution Approach 1:
The patent uses parameter changes to set the NHF flow rate equal to or slightly above the measured peak inspiratory flow. This ensures the flow is low enough to minimize breathing work but high enough to prevent room air entrainment and ensure adequate FiO2 delivery, as the flow matches actual patient demand.
4Ease of operation
If standard-based flow setting is used for NHF therapy, then initial setup is simplified, but precision in meeting patient-specific demands is reduced
Solution Approach 1:
The patent applies self-service by having the system automatically determine the NHF flow setting using the peak inspiratory flow data already collected during mechanical ventilation. This eliminates the need for clinicians to manually estimate or calculate appropriate flow settings based on patient characteristics, providing both ease of operation and patient-specific precision.
Data Source
AI summary
Various methods and systems are provided for performing nasal high flow therapy. In one example, a method for respiratory support includes: delivering an air and oxygen mixture for nasal high flow therapy to a patient at a flow setting, the flow setting determined based on a peak inspiratory flow obtained during a previous, spontaneous breathing mode during mechanical ventilation of the patient. The flow setting may be a flow rate of a heated and humidified mixture of air and oxygen delivered via a high flow nasal cannula.