Integer Holdings likes to keep its business close to the heart. The company is a leading maker of batteries used in implantable medical devices such as pacemakers and implantable cardioverter defibrillators (ICDs). Other medical components include electrodes, capacitors, engineered components, enclosures, and feedthroughs (used to deliver electrical signals from an implantable medical device to an electrode). Integer Holdings also makes batteries for demanding industrial applications, such as oil and gas exploration. The business gets nearly half of its sales from US clients.