Hybrid Negative Pressure Assembly With Chemical Reactor
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Solution Overview
Problem
Negative pressure therapy systems face challenges in maintaining consistent pressure levels, as initial sealing issues may not be immediately noticeable, and pressure can decrease below target ranges, leading to discomfort for patients and reduced therapy effectiveness.
Innovation Solution
A negative pressure assembly comprising a drape, sealing element, reactor, and mechanical pump assembly, which creates an enclosed volume and includes a relief valve to maintain pressure within a predetermined range, using a chemical pump or mechanical pump to draw air and consume selected gases, ensuring consistent negative pressure application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a chemical pump is used to generate negative pressure, then the negative pressure can be maintained over time, but the initial negative pressure is insufficient for the first few minutes of operation
Solution Approach 1:
The patent combines a chemical pump (reactor) with a mechanical pump assembly to create a hybrid system. The mechanical pump provides immediate negative pressure generation when activated, while the chemical pump maintains the negative pressure over extended periods through continuous chemical reaction. This merging of two different pumping mechanisms resolves the contradiction between initial pressure generation speed and long-term pressure maintenance duration.
2Reliability
If high negative pressure is applied to ensure therapeutic effectiveness, then wound healing is improved, but the dressing becomes uncomfortable for the patient
Solution Approach 1:
The patent employs a dynamic pressure regulation system where the relief valve automatically adjusts the negative pressure level within the enclosed volume. The valve opens at specific pressure thresholds to release excess vacuum, preventing the pressure from dropping too far below atmospheric pressure. This dynamic adjustment ensures the negative pressure remains within a therapeutic range that is both effective for wound healing and comfortable for patient tolerance.
3Reliability
If the dressing is not properly sealed, then negative pressure cannot be maintained, but the sealing issue is not noticeable for several minutes
Solution Approach 1:
The patent incorporates a relief valve that provides immediate feedback on pressure changes within the enclosed volume. When a sealing defect occurs, the relief valve detects the pressure fluctuation and responds by adjusting its opening/closing state, which can be observed as changes in valve operation or audible cues. This feedback mechanism allows for immediate detection of sealing failures, eliminating the delayed recognition problem and enabling prompt corrective action.
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 system effectively maintains negative pressure within a therapeutic range, preventing discomfort and ensuring the effectiveness of the therapy by using a reactor to consume gases and a relief valve to adjust pressure differentials, thus enhancing patient comfort and treatment outcomes.
Implementation Method 1
The reactor is configured to react with and consume a selected gas found in air
Implementation Method 2
the mechanical pump assembly has a pump chamber in fluid communication with the enclosed volume to draw air from the enclosed volume into the pump chamber
Implementation Method 3
When a pressure differential between ambient and the enclosed volume is outside a predetermined pressure range, the relief valve allows gas from ambient to enter the enclosed volume
Data Source
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AI summary
A negative pressure assembly includes a drape, a sealing element, a reactor, and a mechanical pump assembly. The drape covers a dressing site on a patient and seals against the skin upon application of a vacuum while maintaining a negative pressure underneath the drape. When applied to the skin, the sealing element cooperates with the drape to define an enclosed volume covered by the drape and surrounded by the sealing element. The reactor is located with respect to the drape and the sealing element to be in fluid communication with the enclosed volume when the drape is covering the dressing site and is configured to react with and consume a selected gas found in air. The mechanical pump assembly is connectable to the enclosed volume and has a pump chamber in fluid communication with the enclosed volume to draw air from the enclosed volume into the pump chamber.