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University of Toronto researchers develop portable 3D skin printer to repair deep wounds

Posted on May 7, 2018

University of Toronto researchers have developed a handheld 3-D skin printer that deposits even layers of skin tissue to cover and heal deep wounds. The team believes it to be the first device that forms tissue in situ, depositing and setting in place, within two minutes or less.

For patients with deep skin wounds, all three skin layers – the epidermis, dermis and hypodermis – may be heavily damaged. The current preferred treatment is called split-thickness skin grafting, where healthy donor skin is grafted onto the surface epidermis and part of the underlying dermis.

skin 3d printer
From left to right, Associate Professor Axel Guenther, Navid Hakimi and Richard Cheng have created the first ‘skin printer’ that forms tissues in situ for application to wounds (photo by Liz Do)

Split-thickness grafting on large wounds requires enough healthy donor skin to traverse all three layers, and sufficient graft skin is rarely available. This leaves a portion of the wounded area “ungrafted” or uncovered, leading to poor healing outcomes.

Although a large number of tissue-engineered skin substitutes exist, they are not yet widely used in clinical settings.

The research team believes their in-situ skin printer is a platform technology that can overcome these barriers, while improving the skin-healing process – a major step forward.

The handheld skin printer resembles a white-out tape dispenser – except the tape roll is replaced by a microdevice that forms tissue sheets. Vertical stripes of “bio ink,” made up of protein-based biomaterials including collagen, the most abundant protein in the dermis, and fibrin, a protein involved in wound healing, run along the inside of each tissue sheet.

News Source: https://www.utoronto.ca/news/u-t-researchers-develop-portable-3d-skin-printer-repair-deep-wounds

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