Researchers obtained pacemaker programmers, home monitors, and pacemaker devices made by four different manufacturers. The architecture and even technical implementation of pacemaker systems across manufacturers is very similar. We hope that pacemaker manufacturers work together to share innovative cyber security designs and compete on user experience and health benefits as opposed to competing on cybersecurity. In the spirit of coordinated disclosure, any potential vulnerabilities discovered during this project was/will be reported through DHS ICS-CERT. Specific vulnerabilities, weaknesses associated with specific vendors, and exploits will not be discussed in these blogposts.”]
Source: http://blog.whitescope.io/2017/05/understanding-pacemaker-systems.html