Nasal Pillow Bypass Flow for Leak Control
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Solution Overview
Problem
Current devices for providing therapeutic gas flows at pressures above atmospheric pressure face challenges such as uncontrolled leaks, discomfort, and difficulty in adjusting pressure to match varying airway obstructions during sleep, leading to inefficient treatment and patient discomfort.
Innovation Solution
A user interface with nasal pillows divided into separate passages for gas delivery, pressure measurement, and high-flow bypass, coupled with control circuitry that adjusts pressure and flow in real-time based on measured data to maintain optimal therapy parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealed nasal pillow interface is used to prevent leaks, then treatment efficiency improves, but patient comfort deteriorates due to difficulty in exhaling and uncontrolled leaks
Solution Approach 1:
The nasal pillow interface is divided into separate passages: a first passage for delivering pressurized therapeutic gas and a second passage for bypass flow. This segmentation allows the therapeutic gas to be delivered effectively while providing a separate path for comfortable exhalation, resolving the contradiction between treatment efficiency and patient comfort.
Solution Approach 2:
A bypass passage acts as an intermediary element between the sealed interface and the patient's exhalation needs. This intermediate path allows excess pressure and exhaled gas to escape comfortably without compromising the seal integrity or treatment efficiency.
2Reliability
If pressure is increased to overcome airway obstruction, then treatment efficacy improves, but patient comfort deteriorates due to difficulty in exhaling
Solution Approach 1:
The system segments the gas flow paths into a therapeutic passage for pressurized delivery and a bypass passage for pressure relief. This allows high pressure to be maintained for treatment efficacy while providing a low-resistance path for comfortable exhalation through the bypass.
Solution Approach 2:
The system changes the flow parameters by introducing a bypass passage that allows gas to flow at different pressure levels. The bypass passage handles the pressure relief function, allowing the main therapeutic passage to maintain optimal treatment pressure without causing exhalation difficulty.
3Object-affected harmful factors
If a high-flow bypass passage is added to improve exhalation comfort, then patient comfort improves, but device complexity increases
Solution Approach 1:
The bypass passage is merged with the nasal pillow interface structure itself rather than being a separate component. The pillows are configured with internal passages that combine the therapeutic gas delivery and bypass functions in a single integrated structure, minimizing additional complexity.
Solution Approach 2:
The nasal pillow structure serves multiple functions: it seals against the nares, delivers therapeutic gas through the first passage, and provides bypass flow through the second passage. This multi-functionality reduces the need for additional separate components, keeping the overall device complexity manageable.
4Reliability
If real-time pressure adjustment is implemented to match airway resistance changes, then treatment efficacy improves, but device complexity and cost increase
Solution Approach 1:
The system implements feedback control by monitoring flow through the bypass passage and adjusting the pressure delivered by the blower accordingly. The control system uses the bypass flow as an indicator of airway resistance and adjusts pressure in real-time to maintain optimal treatment efficacy while adapting to changing patient needs.
Solution Approach 2:
The bypass passage serves as a self-regulating element that provides automatic feedback about airway resistance. The system uses this self-service mechanism where the bypass flow characteristics directly inform the pressure adjustment needs, reducing the complexity of external monitoring systems.
Data Source
AI summary
A fan unit which in use forms part of a gases supply unit, the gases supply unit suitable for use as part of a system for providing heated humidified gases to a user, the fan unit having a casing that has an inlet aperture and an outlet passage, the outlet passage including an exit aperture, the fan unit also including a fan which is located inside the casing and which is adapted for connection to a motor to drive rotation of the fan in use, the fan drawing gases into the casing via the inlet aperture, and forcing these gases out of the casing via the outlet passage as a gases stream, the outlet passage further including at least one bypass vent hole independent of the exit aperture and arranged at an angle to the path of the gases stream through the outlet passage.