Deformation-Resistant Wound Interface for Dynamic Pressure Therapy
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Solution Overview
Problem
Current negative pressure wound therapy (NPWT) devices face issues such as dressing overlap causing maceration, painful dressing changes, uneven suction pressure distribution, diminished blood flow, and inability to increase blood flow in wounds with severe vasculopathy, as well as drainage problems and limitations in use during terminal wound healing.
Innovation Solution
A wound therapy apparatus with a deformation-resistant wound interface that securely encloses the wound bed, allowing periodic variation of pressure to massage the wound and promote blood flow, using a pad to absorb exudate and a control module to manage therapy parameters, enabling improved wound healing without constant dressing contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dressing is packed into the wound bed and sealed with a sheet, then negative pressure can be applied to evacuate exudate, but the dressing must be trimmed to exact geometry which causes overlap on normal skin leading to maceration
Solution Approach 1:
The patent removes the traditional dressing component from the system and replaces it with a wound interface that directly contacts the wound bed. This extraction of the dressing eliminates the need for precise trimming and prevents overlap on normal skin, thereby eliminating maceration while maintaining exudate evacuation capability through the wound interface's direct contact and sealing mechanism.
Solution Approach 2:
The wound interface serves multiple functions simultaneously: it acts as the sealing barrier, the exudate absorption medium, and the negative pressure application surface. This multi-functionality eliminates the need for separate dressings and allows for a simpler, more accurate fit on the wound bed without causing maceration of surrounding skin.
2Reliability
If dressing is changed frequently to remove accumulated exudate, then drainage effectiveness is maintained, but dressing changes are painful and require analgesics or local anesthetic
Solution Approach 1:
The patent introduces dynamic pressure variation where the wound interface is periodically compressed and released. This dynamic mechanism continuously maintains drainage effectiveness through mechanical stimulation and pressure gradients, eliminating the need for frequent static dressing changes and associated pain while maintaining continuous exudate evacuation.
Solution Approach 2:
The wound interface employs periodic compression and release cycles that rhythmically stimulate exudate removal. This periodic action maintains drainage effectiveness over extended periods without requiring frequent interruptions for dressing changes, thereby improving patient comfort and eliminating the need for analgesics during procedure changes.
3Reliability
If suction pressure is applied continuously to evacuate exudate, then drainage is improved, but blood flow to the wound bed is diminished
Solution Approach 1:
The patent implements periodic variation of pressure within the wound interface, alternating between compression phases that enhance exudate evacuation and release phases that restore blood flow. This periodic action maintains effective drainage while preventing continuous compression-induced ischemia, thereby balancing exudate removal with blood flow preservation.
Solution Approach 2:
The system dynamically changes pressure parameters over time, transitioning between high compression states for enhanced drainage and low or zero pressure states for blood flow restoration. This parameter variation allows the system to achieve both effective exudate evacuation and maintenance of adequate blood flow to the wound bed.
4Stress or pressure
If a rigid sealing structure is used to maintain negative pressure, then pressure control is improved, but the structure cannot accommodate wound bed distention
Solution Approach 1:
The patent employs a flexible wound interface structure that can deform to accommodate wound bed distention while maintaining negative pressure control. The flexible design allows the interface to conform to changing wound geometry and tissue deformation, preserving both pressure control effectiveness and adaptability to wound bed variations.
Solution Approach 2:
The wound interface is designed with dynamic flexibility that allows it to adapt its shape and volume in response to wound bed distention while maintaining the negative pressure environment. This dynamic characteristic enables the structure to accommodate tissue deformation and swelling without compromising pressure control or sealing effectiveness.
Data Source
AI summary
The wound therapy apparatus may include a wound interface sealingly securable to the skin surface around a wound bed to encloses the wound bed within an enclosed space that is fluid-tight. The wound interface may be sufficiently deformation resistant to distend at least a portion of the wound bed into the enclosed space when pressure p0 within the enclosed space is less than ambient pressure pamb. Fluid may be communicated with the enclosed space when the wound interface is sealingly secured to the skin surface in order to vary a pressure p0 within the enclosed space periodically over the pressure range pmin≤p0≤pmax. The variation of the pressure p0 may distend the wound bed into communication with a pad received within the enclosed space and decreases the wound bed contact with the pad. Related methods of use of the wound therapy apparatus are also disclosed.