Key Players: (this may not be a complete list and extra companies can be added upon request)

Medtronic PLC
Abbott Laboratories
Boston Scientific Corporation
Biotronik SE & Co. KG
MicroPort Scientific Corporation
LivaNova PLC
Koninklijke Philips N.V.
Nihon Kohden Corporation
Zoll Medical Corporation
St. Jude Medical Inc. (acquired by Abbott)