US researchers demonstrate handheld 3D bioprinter

The bioprinter, developed by Dr. Ali Tamayol, associate professor in the School of Dental Medicine biomedical engineering department, enables surgeons to deposit scaffolds to help support cellular and tissue growth directly into the defect sites within weakened skeletal muscles.

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The scaffolds from the bioprinter adhere precisely to the surrounding tissues of the injury and mimic the properties of the existing tissue; eliminating the need for any suturing. "The printer is robust and allows proper filling of the cavity with fibrillar scaffolds in which fibers resemble the architecture of the native tissue," said Tamayol.

The system prints gelatin-based hydrogels - known as "bioink" - that have been proven to be effective in adhering to defect sites of mice with volumetric muscle loss injury. The mice showed a significant increase in muscle hypertrophy following Tamayol's therapy. "This is a new generation of 3D printers than enables clinicians to directly print the scaffold within the patient's body," said Tamayol.