Wound Dressing Stabilizing Adipose Stem Cells for Chronic Ulcer Healing
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Solution Overview
Problem
Current treatments for chronic ulcers, particularly diabetic foot ulcers, are limited in efficacy due to the instability of adipose-derived stem cells (ADSCs) when physically or temporally applied, leading to inadequate wound healing and potential rejection of xenogenic materials.
Innovation Solution
A dressing is developed that allows unstimulated ADSCs to be seeded on a polymer or silicone gel surface, using a xeno-free medium for cell attachment, enabling long-term storage at low temperatures and facilitating ADSC migration into the wound environment, with at least 80% of cells remaining viable and migrating to the wound site.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ADSCs are physically or temporally applied to treat chronic ulcers, then wound healing is promoted, but cell stability deteriorates leading to inadequate healing and potential rejection
Solution Approach 1:
The patent introduces a dressing as an intermediary carrier that stabilizes ADSCs during storage and transport while maintaining their therapeutic activity. The dressing serves as a mediator between cell production and clinical application, solving the stability issue without compromising healing efficacy.
Solution Approach 2:
The patent applies ADSCs to the dressing in advance during manufacturing, allowing cells to be pre-positioned and stabilized before clinical use. This preliminary action ensures cell stability during storage while maintaining their ability to promote wound healing when applied to the ulcer site.
2Duration of action of stationary object
If ADSCs are stored at low temperatures for long-term storage, then storage stability is improved, but cell viability may deteriorate
Solution Approach 1:
The patent employs the dressing structure as a protective cushion that shields ADSCs from damage during freezing and storage. This beforehand cushioning prevents cell membrane damage and maintains viability throughout long-term storage at low temperatures.
Solution Approach 2:
The patent utilizes changes in physical parameters (temperature, phase state) to preserve cell viability. By controlling the freezing-thawing process and storage conditions, the patent maintains cell biological activity while enabling long-term storage stability.
3Object-affected harmful factors
If unstimulated ADSCs are used to avoid rejection, then immunogenicity is reduced, but cell migration and proliferation capability may deteriorate
Solution Approach 1:
The patent relies on the intrinsic self-service capabilities of unstimulated ADSCs. The cells naturally migrate and proliferate at the wound site without external stimulation, utilizing their inherent biological properties to promote healing while avoiding immunogenic activation.
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 dressing ensures effective wound healing by maintaining ADSC viability and facilitating their migration into the wound environment, achieving significant reduction in wound area and promoting tissue regeneration, as demonstrated by scratch closure assays and model wound environment tests.
Implementation Method 1
seeded on a polymer or silicone gel surface, using a xeno-free medium for cell attachment
Implementation Method 2
facilitating ADSC migration into the wound environment
Implementation Method 3
long-term storage at low temperatures
Data Source
AI summary
A dressing is disclosed for treating hard-to-heal wounds and a process for the manufacture thereof, which may be useful in clinical practice, in particular for treating diabetic foot ulceration.