Breathing Assistance Pressure Sensor Structure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing breathing assistance systems, such as ventilators and CPAP devices, face challenges in accurately measuring pressure at the patient end of the connection system due to inherent pressure drop effects, making it difficult to deliver consistent pressure to patients.
Innovation Solution
A pressure sensor is positioned near the gas delivery device, with a structure that creates a localized pressure drop to approximate the pressure drop along the patient circuit, allowing for accurate pressure measurement and control of the gas delivery system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a pressure sensor is positioned near the gas delivery device to simplify the system, then device complexity is reduced, but measurement precision deteriorates due to pressure drop effects in the patient circuit
Solution Approach 1:
The pressure sensor structure modifies the local flow parameters by creating a controlled pressure drop zone. The structure includes flow restriction elements that change the velocity and pressure distribution in the gas flow, allowing the sensor to measure a pressure that represents the patient end conditions rather than the raw delivery device pressure
Solution Approach 2:
The pressure sensor structure acts as an intermediary between the gas delivery device and the patient circuit. It creates a localized measurement zone that simulates the pressure conditions at the patient end without requiring physical proximity to the patient, thereby mediating between the simplified sensor location and accurate pressure representation
2Measurement precision
If a pressure sensor is positioned near the patient end of the connection system to improve measurement precision, then measurement precision improves, but device complexity increases due to additional tubing and sensors
Solution Approach 1:
The pressure sensor structure creates a copied representation of the patient end pressure conditions at the gas delivery device location. By designing the structure to generate a pressure drop equivalent to that in the patient circuit, it produces a measurement that copies the desired information without requiring physical presence at the patient end
Solution Approach 2:
The pressure sensor structure segments the gas flow into distinct zones: a measurement zone where pressure is sampled, a restriction zone where the controlled pressure drop occurs, and a flow continuation zone. This segmentation allows the sensor to isolate and measure the relevant pressure parameter while maintaining overall system simplicity
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 solution enables the gas delivery control system to accurately compensate for pressure drops in the patient circuit, ensuring that the pressure delivered to the patient is consistent and effective, even at varying flow rates.
Implementation Method 1
a structure configured to affect the gas flow in the conduit to create a localized pressure drop proximate the pressure sensor structure
Data Source
AI summary
A breathing assistance system for providing breathing assistance to a patient is provided. The breathing assistance system may include a ventilation system for supplying a gas flow, a conduit operatively coupled to the ventilation system, and a pressure sensor configured to measure the pressure of the gas flow through the conduit. The pressure sensor may include a structure configured to create a localized pressure drop in the gas flow proximate the pressure sensor structure.