Sensor Placement in Manual Resuscitators for Ventilation Monitoring
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Solution Overview
Problem
Current manual ventilation devices lack accurate and objective means for healthcare providers to control tidal volume, pressure, and ventilation rate, leading to risks of under-ventilation or over-ventilation, which can result in serious complications such as barotrauma, gastric insufflation, and ARDS, due to the subjective nature of monitoring airflow parameters.
Innovation Solution
Incorporating sensors at the air inlet of manual resuscitators and ventilation devices to measure airflow parameters like pressure, volumetric flow rate, and temperature, allowing for reusable and cost-effective monitoring while minimizing dead space and reducing the risk of contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are placed at the outlet of manual ventilation devices, then airflow parameters can be measured, but dead space increases and contamination risk increases
Solution Approach 1:
The patent inverts the conventional sensor placement location from the outlet to the inlet of the manual ventilation device. By placing sensors at the inlet where clean air enters the bag, the system achieves accurate airflow parameter measurement without increasing dead space or contamination risk, as the inlet area has minimal volume and is not in contact with exhaled gases.
Solution Approach 2:
The patent uses the inlet air stream as an intermediary medium to carry sensor measurements. Sensors placed at the inlet measure airflow parameters in the clean air stream before it enters the bag, effectively using the inlet air as a mediator that provides measurement data without requiring the sensor to be positioned in the outlet path where dead space and contamination are concerns.
2Measurement precision
If sensors are placed at the outlet of manual ventilation devices, then airflow parameters can be measured, but the sensors are more prone to contamination
Solution Approach 1:
The patent inverts the conventional sensor placement location from the outlet to the inlet of the manual ventilation device. By placing sensors at the inlet where clean air enters the bag, the system achieves accurate airflow parameter measurement without increasing dead space or contamination risk, as the inlet area has minimal volume and is not in contact with exhaled gases.
Solution Approach 2:
The patent extracts the sensor placement from the contaminated outlet environment and relocates it to the clean inlet environment. This separation removes the sensors from the harmful exhaled gases and potential contaminants at the outlet, while maintaining the ability to measure airflow parameters through the inlet air stream.
3Object-affected harmful factors
If disposable sensors are used, then contamination risk is reduced, but cost increases
Solution Approach 1:
The patent applies the disposable principle to the sensor assembly by creating a low-cost, single-use sensor unit that can be discarded after use. This disposable sensor assembly includes all necessary sensing elements and housing in an integrated, inexpensive package that eliminates the need for sterilization and allows repeated use of the expensive manual ventilation device itself.
Solution Approach 2:
The patent segments the manual ventilation device into reusable and disposable components. The expensive bag and valve mechanism remains reusable, while the sensor assembly is separated as a disposable component. This segmentation allows the critical measurement function to be performed by a cheap, single-use sensor that can be discarded, while preserving the investment in the main device.
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 solution provides accurate and objective monitoring of airflow parameters, reducing the risk of complications by enabling precise control of ventilation, improving patient outcomes, and reducing the cost of care through reusable sensors that can be sterilized and integrated into existing devices.
Implementation Method 1
measuring a parameter of the inlet air, wherein the parameter is selected from the group consisting of pressure, volumetric flow rate, and temperature
Implementation Method 2
measuring a parameter of the inlet air, wherein the parameter is selected from the group consisting of pressure, volumetric flow rate, and temperature
Data Source
AI summary
A “bag ventilator assembly” includes a compression bag, a manifold, a breathing interface, and a sensor. The compression bag is configured to be attached to deliver a breathing gas to the manifold and has an air inlet and an air outlet. The air inlet includes a one-way valve that allows air to flow into the compression bag from the ambient as the compression bag expands, and the manifold is connected to the air outlet of the compression bag. The breathing interface is configured to be attached to the air outlet of the manifold to receive the breathing gas from the manifold, and the sensor is configured to be secured to the air inlet on the compression bag such that the sensor can sense air entering the compression bag while remaining isolated from exhaled air.