Mark Singer
Encyclopedia
Dr. Mark Singer MD, is an American
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 doctor
Physician
A physician is a health care provider who practices the profession of medicine, which is concerned with promoting, maintaining or restoring human health through the study, diagnosis, and treatment of disease, injury and other physical and mental impairments...

 who is best known for inventing, with speech pathologist Eric Blom, while working at Methodist Hospital, Indianapolis, a type of voice prosthesis
Prosthesis
In medicine, a prosthesis, prosthetic, or prosthetic limb is an artificial device extension that replaces a missing body part. It is part of the field of biomechatronics, the science of using mechanical devices with human muscle, skeleton, and nervous systems to assist or enhance motor control...

 that allows victims of laryngeal cancer (cancer of the larynx) to talk.
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