Ventilator limp mode using stored backup parameters
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Solution Overview
Problem
Conventional medical ventilators shut down and alarm when a hardware problem occurs, posing a risk in life support situations where caregivers may not be immediately available to address the issue, as they fail to provide specified therapy.
Innovation Solution
A medical ventilator system that detects hardware problems and transitions to a backup therapy mode, using stored parameters such as average generator speed, pressure levels, and breath rates to continue delivering ventilation therapy based on the previously established specifications, ensuring continued support to the patient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ventilator shuts down when a hardware problem occurs, then the ventilator maintains strict adherence to therapy specifications, but the patient care continuity is compromised
Solution Approach 1:
The ventilator pre-calculates and stores backup parameters (such as average generator speed, pressure levels, and breath rates) during normal operation before a failure occurs. When a hardware problem is detected, these pre-stored parameters enable immediate transition to backup therapy mode without interruption, resolving the contradiction between maintaining therapy specifications and ensuring patient care continuity.
Solution Approach 2:
The system prepares compensatory measures in advance by continuously monitoring operational parameters and storing backup values that can compensate for potential hardware failures. This beforehand cushioning allows the ventilator to maintain acceptable therapy delivery even when components fail, balancing specification adherence with reliability.
2Reliability
If the ventilator provides backup therapy using stored parameters, then patient care continuity is maintained, but the ability to provide specified therapy is compromised
Solution Approach 1:
The ventilator implements a tiered response to hardware failures: when possible, it maintains full specified therapy; when hardware limitations prevent this, it provides partial therapy using backup parameters that approximate the original specification. This partial action approach ensures continuity of care while acknowledging the compromise in therapy precision.
Solution Approach 2:
The system dynamically adjusts operational parameters based on hardware capability. When hardware problems are detected, the ventilator modifies parameters such as generator speed, pressure levels, and breath rates to match stored backup parameters, enabling adaptation to reduced functionality while maintaining patient care continuity.
3Reliability
If the ventilator continuously monitors and stores backup parameters, then the transition to backup therapy is seamless, but the device complexity increases
Solution Approach 1:
The controller performs multiple functions: it manages normal ventilator operation, continuously monitors hardware status, calculates and stores backup parameters, and executes transition to backup therapy mode. This multi-functionality consolidates what could be separate complex systems into a single integrated controller, managing complexity while ensuring seamless therapy transition.
Solution Approach 2:
The ventilator implements continuous feedback monitoring of operational parameters and hardware status. This feedback mechanism enables the system to detect failures, trigger backup parameter usage, and potentially revert to normal operation when hardware is restored, creating a self-managing system that reduces the need for complex external control while maintaining reliability.
Data Source
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AI summary
A method of operating a ventilator (5) that includes steps of (a) providing a specified ventilation therapy to a patient through a ventilator (5) according to a specification; (b) determining and storing a backup parameter relating to the operation of the ventilator (5) or the breathing of the patient during the step of providing the specified ventilation therapy; (c) determining that an alarm condition exists that indicates a problem with the ventilator (5) that would prevent the ventilator (5) from providing the specified ventilation therapy to the patient according to the specification; and (d) responsive to determining that the alarm condition exists, providing backup ventilation therapy to the patient through the ventilator (5) that is based at least partially on the stored backup parameter. Also, a ventilator (5) that is adapted to perform the method just described.