CPAP Cushion with Dynamic Bladder Pressure for Seal and Comfort
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Solution Overview
Problem
Patients undergoing CPAP therapy for obstructive sleep apnea face issues such as skin irritation, discomfort, and mask leaks due to prolonged pressure on the skin, leading to reduced effectiveness and comfort during treatment.
Innovation Solution
A patient interface with a cushion that dynamically changes contact pressure and location, using fluid-filled bladders and partitioned cells to alternately apply and release pressure, providing a massaging effect and maintaining a continuous seal, thereby reducing skin irritation and improving comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mask cushion applies continuous pressure to the patient's skin to maintain a seal, then the seal reliability is improved, but skin irritation and pressure sores occur due to prolonged compression of blood capillaries
Solution Approach 1:
The cushion incorporates multiple independently pressurizable cells that alternately inflate and deflate in a periodic sequence. This periodic action maintains continuous seal pressure on the patient's skin while allowing individual cells to release pressure temporarily, preventing prolonged compression of blood capillaries and reducing skin irritation and pressure sores.
2Reliability
If headgear straps are tightened to stop mask leaks, then the seal reliability is improved, but discomfort and pressure sores increase due to tightening the entire cushion against the patient's face
Solution Approach 1:
The cushion is divided into multiple independently controllable cells or regions. When a leak is detected in a specific region, only the headgear straps corresponding to that region are tightened, while other regions maintain normal or reduced pressure. This segmented approach stops leaks locally without tightening the entire cushion, thereby reducing overall discomfort and preventing pressure sores.
3Stability of the object's composition
If a single mask cushion design is used for prolonged therapy, then treatment consistency is maintained, but skin irritation increases due to continuous pressure on the same skin regions
Solution Approach 1:
The cushion cells are activated in alternating sequences, periodically changing which cells are pressurized and which are deflated. This periodic alternation shifts the contact pressure to different skin regions over time, allowing previously pressed areas to recover and reducing cumulative skin irritation, while maintaining overall treatment consistency through controlled pressure delivery.
4Reliability
If moisture is allowed to accumulate against the skin during mask wear, then the seal may be maintained, but skin irritation increases due to blocked skin ducts and softened skin
Solution Approach 1:
The cushion incorporates hydrophilic or moisture-wicking materials in specific contact regions to locally manage moisture accumulation. These specialized zones draw moisture away from the skin surface while maintaining the seal in other regions, thereby preventing blocked skin ducts and softened skin without compromising overall seal integrity.
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 dynamic pressure adjustment and massaging effect enhance patient comfort, reduce skin irritation, and minimize leaks, ensuring effective treatment by maintaining a consistent seal and promoting better sleep quality.
Implementation Method 1
each of the bladders is adapted to be pressurized independently from one another. At least one of the bladders is an active bladder that is pressurized to at least a sealing pressure to form a continuous seal with the patient's face
Implementation Method 2
A cushion for a patient interface. The cushion includes two or more bladders arranged in concentric relation
Data Source
AI summary
A cushion for a patient interface includes two or more bladders arranged in concentric relation. Each of the bladders includes a face-contacting portion adapted to engage the patient's face, and each of the bladders is adapted to be pressurized independently from one another. At least one of the bladders is an active bladder that is pressurized to at least a sealing pressure to form a continuous seal with the patient's face in use.