Segmented Micro Tissue Grafts for Scalable Wound Coverage
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Solution Overview
Problem
Conventional autografting techniques face limitations in providing efficient graft tissue with minimal donor site scarring while accurately replicating normal tissue microanatomy at the recipient site, especially for wounds of varying sizes and shapes.
Innovation Solution
The method involves harvesting full-thickness micro tissue columns from a donor site, arranging them in a desired epidermal-dermal orientation, and assembling them into a three-dimensional tissue construct using a biocompatible matrix, which can be rolled to fit various wound geometries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If full-thickness grafts are used to maintain tissue quality and reduce scarring at the recipient site, then the donor site is completely sacrificed with no dermis left for skin regeneration
Solution Approach 1:
The patent segments the full-thickness skin graft into multiple thin epidermal layers that can be stacked. Each layer is thin enough to allow donor site regeneration while collectively providing sufficient thickness and quality for the recipient site. This segmentation resolves the contradiction by dividing the graft into manageable units that balance donor site preservation with recipient site quality requirements.
Solution Approach 2:
The patent employs a nested structure where multiple epidermal layers are stacked one on top of another like dolls within dolls. Each layer nests within the overall graft construct, creating a multi-layered tissue structure that provides full-thickness quality while using thinner individual layers that preserve donor site regenerative capacity.
2Adaptability or versatility
If split-thickness grafts are used to allow donor site recovery, then the graft lacks sufficient dermal elements for structural stability and normal appearance
Solution Approach 1:
The patent merges multiple thin epidermal layers into a single composite graft structure. By combining several layers harvested from the same donor site, the resulting graft achieves sufficient thickness and dermal content for structural stability and normal appearance, while each individual layer remains thin enough to allow donor site recovery. This merging strategy resolves the contradiction between donor site recovery and graft strength.
3Area of stationary object
If conventional sheet grafts are used to cover large recipient sites, then the donor site area must be large causing excessive adverse effects
Solution Approach 1:
The patent segments the graft into multiple thin layers that can be harvested from a smaller donor site area. These segmented layers are then stacked to create a sufficiently thick graft that can cover large recipient sites, eliminating the need to harvest large-area sheets that would cause excessive donor site damage.
Solution Approach 2:
The patent transitions from a two-dimensional sheet graft approach to a three-dimensional stacked layer construction. By adding the vertical dimension through layer stacking, the graft achieves sufficient thickness and coverage area without requiring a proportionally large donor site area, thus reducing adverse effects at the donor site.
Data Source
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AI summary
Systems and methods for assembling a plurality of tissue grafts are provided. A method includes harvesting the plurality of micro tissue grafts from a donor site, arranging the plurality of micro tissue grafts in a desired orientation, forming a tissue construct containing the plurality of micro tissue grafts arranged in the desired orientation, and applying the tissue construct to a recipient site.