Breathing Circuit Elbow Connector With Sensor Ports and Heater Wiring

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Solution Overview

Problem

Existing medical tubes and connectors for breathing circuits lack efficient mechanisms for temperature and humidity monitoring, as well as electrical connectivity for heating and sensing, which are crucial for maintaining optimal respiratory conditions.

Innovation Solution

The development of medical tubes with integrated heater and sensor wires, along with connectors featuring electrical ports and sensor ports, allows for real-time monitoring and control of gas temperature and humidity, and provides electrical connections for heating and sensing functions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If medical tubes are used without integrated heating and sensing capabilities, then the device complexity is reduced, but the ability to monitor and control temperature and humidity is insufficient

Engineering Contradiction:
Improvetemperature and humidity controlVSAvoiddevice complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent integrates heater wires and sensor wires directly into the medical tube structure, combining multiple functions (heating, sensing, fluid transport) into a single integrated component. This eliminates the need for separate heating elements and sensors, reducing overall system complexity while improving temperature and humidity control reliability

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The medical tube is designed to perform multiple functions simultaneously: transporting respiratory gases, providing heating through embedded heater wires, monitoring temperature via sensor wires, and maintaining structural flexibility. This multi-functionality approach allows one component to replace what would traditionally require multiple separate devices

Inventive Principle:
Principle #6Universality (Multi-functionality)

2Ease of manufacture

If connectors without electrical ports are used, then the manufacturing process is simpler, but electrical connectivity for heating and sensing is lost

Engineering Contradiction:
Improveease of manufactureVSAvoidelectrical connectivity
Core Design Contradiction:
Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The electrical ports and wire connection points are pre-integrated into the connector structure during manufacturing. The heater and sensor wires are pre-positioned and connected to the electrical ports before the connector is assembled, eliminating the need for complex post-assembly wiring and simplifying the overall manufacturing process while ensuring reliable electrical connectivity

Inventive Principle:
Principle #10Preliminary action

3Productivity

If smooth bore tubes are used, then gas flow resistance is reduced, but structural strength and flexibility are compromised

Engineering Contradiction:
Improvegas flow efficiencyVSAvoidstructural strength
Core Design Contradiction:
ProductivityVSStrength

Solution Approach 1:

The medical tube employs a composite construction with an inner smooth bore layer for optimal gas flow and an outer reinforced layer providing structural strength and flexibility. The heater and sensor wires are embedded within this composite structure, allowing the tube to maintain both low flow resistance and high mechanical integrity through the synergistic combination of different material properties

Inventive Principle:
Principle #40Composite materials

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

Enables precise control of respiratory gas conditions, enhancing patient care by ensuring optimal humidity and temperature levels, and facilitating real-time monitoring and adjustment.

Implementation Method 1

The at least one wire may comprise at least one heater wire

Methodology Applied
Scientific EffectJoule heating: Joule Heating

Implementation Method 2

The at least one wire may comprise a pair of sensor wires

Methodology Applied
Scientific EffectThermistor effect: Thermistor

Data Source

PatentEP3996788B1Medical tubes and connectors for breathing circuits
Publication Date: 2025.08.27 FISHER & PAYKEL HEALTHCARE LTD
  • EP3996788B1 patent drawingFigure 1A
  • EP3996788B1 patent drawingFigure 1B
  • EP3996788B1 patent drawingFigure 2A

AI summary

Disclosed is a connector for a medical tube, the connector having a first portion having a first opening, a second portion having a second opening, a lumen formed by the first portion and the second portion, the lumen providing a gases flow path between the first opening and the second opening, the first portion of the connector comprises at least one sensor port, the sensor port extending, through a wall of the first portion of the connector into the lumen, the second portion of the connector body may have at least one electrical port, the electrical port configured to provide for electrical connection with at least one wire of the medical tube, and the electrical port is located on the top of the second portion of the connector the first portion is angled with respect to the second portion to form an elbow.