Microporous Annealed Particle (MAP) gel, invented by Dr. Griffin, is a synthetic injectable material that forms an open pore scaffold in situ, promoting extensive tissue ingrowth and accelerated wound closure. MAP gel is composed of polyethylene glycol (PEG) microspheres that form a solid, open pore scaffold, resulting in a minimal immune response. MAP gel has shown tissue integration due to interconnected microporosity, which can have tunable physical and degradation properties.

Our research focuses on controlling MAP surface chemistry, porosity, and delivery in order to promote tissue integration and regeneration.





Glottic incompetence is a common laryngeal disorder where the vocal folds no longer fully close which causes loss of speech and dysfunctional swallowing. The preferred treatment is medialization of the vocal folds with a non-invasive injection procedure. Current injectable materials are short lived due to the presence of degradative enzymes only lasting a few months.

There is a need for a permanent injectable which is biocompatible, able to be injected using the standard clinical apparatus, and mechanically matches the tissue. Based on positive initial results using MAP gel in a murine and leporine model we believe this has the potential to be a translatable therapy for glottic incompetence.

This project is funded by the Wallace H. Coulter Foundation

In collaboration with Dr. James Daniero in the UVa Department of Otolarynology


1. Development of microporous annealed particle hydrogel for long-term vocal fold augmentation

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