Ventilator Triggering with Unknown Inspiratory Flow
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Solution Overview
Problem
Conventional medical ventilators cannot detect inspiratory flow triggers when the base flow is indeterminable, leading to uncomfortable and ineffective ventilation for spontaneously breathing patients, especially in backup ventilation modes where inspiratory flow sensors malfunction.
Innovation Solution
The system monitors exhalation flow and accumulator pressure to estimate a base flow, detects flow deviations, and compares them to an inspiratory trigger threshold to initiate inspiration, allowing for comfortable patient-ventilator synchrony even when the base flow is unknown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ventilators use inspiratory flow sensors to detect triggers, then triggering accuracy is improved, but system reliability deteriorates when sensors malfunction in backup modes
Solution Approach 1:
The patent introduces an intermediary estimation mechanism that uses exhalation flow and accumulator pressure data as proxy indicators to infer base flow and detect inspiratory triggers. This intermediary approach allows the system to maintain trigger detection capability when direct inspiratory flow sensors are unavailable or malfunctioning, resolving the contradiction between measurement precision and reliability in backup modes.
Solution Approach 2:
The patent replaces the mechanical flow sensor-based detection system with a computational estimation system that processes existing sensor data (exhalation flow, accumulator pressure) through algorithms to derive base flow and detect triggers. This substitution maintains functionality while improving reliability in scenarios where direct mechanical measurement fails.
2Ease of operation
If base flow is made indeterminable to simplify system operation, then ease of operation is improved, but measurement precision of flow parameters deteriorates
Solution Approach 1:
The system performs self-service by using its own existing sensors (exhalation flow sensor, accumulator pressure sensor) to estimate base flow without requiring external measurement systems. The base flow estimation module processes data already being collected for other ventilation control functions, thereby maintaining ease of operation while recovering measurement precision through computational estimation rather than additional hardware.
Data Source
AI summary
This disclosure describes systems and methods for providing novel back-up ventilation that allows the patient to trigger or initiate the delivery of breath. Further, this disclosure describes systems and methods for triggering ventilation when base flow and/or inspiratory flow is unknown or indeterminable by the ventilator.