Scientists at McGill University in Quebec have created a revolutionary 3D printer designed to aid in the reconstruction of injured vocal cords. This innovation, known as a minimally invasive in-situ bioprinter (MIISB), could mitigate scarring following throat surgery and enhance vocal recovery outcomes.<\/p>\n
The MIISB is equipped with a flexible 2.7-millimeter endoscopic printhead that fits through the standard working channels during phonosurgery. Surgeons can precisely control the nozzle to rebuild the vocal fold\u2019s natural structure by depositing a regenerative hydrogel into the affected areas after polyps or lesions have been removed.<\/p>\n
Globally, voice disorders affect approximately 3% to 9% of individuals, and surgical interventions can often lead to post-operative fibrosis, with around 5% to 18% of patients experiencing scarring that compromises voice quality. Traditional methods, which include percutaneous hydrogel injections, often lack the spatial accuracy necessary for treating certain minor lesions.<\/p>\n
The McGill team\u2019s bioprinter has demonstrated impressive precision, achieving a mean nozzle-positioning error of just 1.33 millimeters and a repeatability of better than 0.2 mm within a 20 mm workspace. Successful manual printing has included creating constructs and repairing simulated vocal-fold defects in a controlled environment.<\/p>\n
Utilizing a specially formulated hydrogel, characterized by its unique adhesive and mechanical properties, the team aims to promote effective tissue repair while minimizing long-term scarring. This hydrogel is crafted to respond to the specific vibrational needs of vocal folds.<\/p>\n
The MIISB features a cable-driven soft robotic printhead housed within a stainless-steel tube, operated by a data-driven model that translates user commands into precise movements. The hydrogel dispensing is regulated by a pressurized syringe and a solenoid valve, allowing integration with standard surgical equipment already used in operating rooms.<\/p>\n
While the device shows promising results, researchers acknowledge it is still in the preclinical phase. Key challenges include the stiffness of the printhead and the issues surrounding manual control and over-extrusion. Further enhancements in hardware design and automated control methods are being explored, with plans for in-vivo animal studies focusing on long-term tissue integration and safety.<\/p>\n
If successful in forthcoming trials, the MIISB could transform how surgeons approach vocal-fold reconstruction, potentially reducing the likelihood of enduring voice issues post-surgery.<\/p>\n