Segmented Inspiratory Limb Heating Across Distinct Temperature Zones
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Solution Overview
Problem
Existing respiratory humidification systems face challenges in maintaining optimal temperature and humidity levels in gas delivery conduits that traverse through distinct temperature zones, leading to issues like condensation or overheating.
Innovation Solution
A segmented inspiratory limb with dual heater wire circuits and sensors in each segment, controlled by a controller that adjusts power distribution based on feedback from multiple sensors to maintain desired temperature and humidity levels across different zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single heater circuit is used throughout the inspiratory limb, then the device complexity is reduced, but the temperature control precision deteriorates when passing through distinct temperature zones
Solution Approach 1:
The inspiratory limb is divided into multiple segments (first segment and second segment) with separate heater wire circuits for each segment. This segmentation allows independent temperature control of each zone, enabling precise temperature management when the conduit passes through distinct temperature zones such as incubators or blanket-covered areas.
Solution Approach 2:
Each segment of the inspiratory limb is equipped with its own heater wire circuit and temperature sensor, allowing localized heating and temperature control. This ensures that each zone receives appropriate heating based on its specific thermal environment, improving overall temperature control precision.
2Measurement precision
If multiple heater wire circuits are implemented in separate segments, then the temperature control precision is improved, but the device complexity increases
Solution Approach 1:
Multiple heater wire circuits from different segments are electrically coupled together through an intermediate connector, allowing them to be controlled by a single controller. This merging approach enables precise temperature control in multiple zones while avoiding the need for separate control systems for each segment.
Solution Approach 2:
The intermediate connector serves multiple functions: it electrically couples heater wire circuits from different segments, provides a common control interface, and integrates sensor feedback from multiple zones. This multi-functionality reduces the overall system complexity while maintaining precise temperature control.
3Temperature
If heating is applied throughout the entire conduit, then the gas temperature is maintained, but condensation or overheating occurs in specific zones
Solution Approach 1:
The heating system transitions from static uniform heating to dynamic zone-specific heating. Each segment can be heated or cooled independently based on real-time temperature sensor feedback, allowing the system to adapt to changing thermal conditions and prevent both condensation and overheating in specific zones.
Solution Approach 2:
Temperature sensors are positioned at multiple locations (intermediate connector and patient-end) to provide feedback on the thermal state of different zones. This feedback enables the controller to adjust heating power to each segment independently, preventing harmful effects like condensation in cooler zones or overheating in warmer zones.
4Measurement precision
If segment-specific sensor feedback is implemented, then the temperature control precision is improved, but the measurement and control complexity increases
Solution Approach 1:
Sensor feedback signals from multiple segments are combined and processed through a single controller that receives inputs from temperature sensors positioned at the intermediate connector and patient-end. This merging approach maintains precise temperature measurement across multiple zones while avoiding the complexity of separate control systems for each segment.
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
Effectively maintains optimal gas temperature and humidity levels by dynamically adjusting heating in response to sensor feedback, reducing condensation and overheating, and ensuring safe delivery to the user.
Implementation Method 1
a first heater wire circuit positioned within the first segment and a second heater wire circuit positioned within the second segment
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
Some embodiments provide for an inspiratory limb for a breathing circuit that includes a first segment that comprises a first heater wire circuit and a second segment that comprises a second heater wire circuit. The inspiratory limb can include an intermediate connector that includes a connection circuit that electrically couples the first heater wire circuit to the second heater wire circuit. The inspiratory limb can be configured to operate in two modes wherein, in a first mode, electrical power passes through the first electrical connection to provide power to the first heater wire circuit without providing power to the second heater wire circuit, and in a second mode, electrical power pass through the first electrical connection to provide power to both the first heater wire circuit and the second heater wire circuit.