Medrobotics Corp., a Raynham-based medical robotics company, announced Thursday the conversion of notes totaling $33.6 million purchased through recent financings into Series D Preferred Stock.

Existing Medrobotics shareholders and undisclosed new investors participated in the Series D raise., the company said in a press release.

The company is developing what it calls the Flex Robotic System.

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“Patients, surgeons, and hospitals will all benefit from the Flex Robotic System ’s enabling minimally invasive surgical technology,” Samuel Straface, Medrobotics president and chief executive, said in a statement. “The Flex Robotic System will provide transoral single-site access and visualization for surgery in hard-to-reach locations in the throat and voice box. Minimally invasive surgery has been shown to be more cost-effective and less painful for the patient and also leads to quicker hospital discharge and faster recovery.”