For ZOLL Medical Corporation we developed a simulation of a rescue situation where the user performs a virtual CPR using ZOLL’s AED 3.


ZOLL Medical Corporation is an international company that develops and markets medical devices and software solutions that are aimed to help advance emergency care, both for medical professionals and lay rescuers alike.

They asked VR Lab to develop a VR application that could be used at trade shows as a sales instrument for their AED 3. This way the user can experience the power of ZOLL’s Real CPR Help®, which guides rescuers to achieve high-quality CPR with the use of the AED 3.

The application

In Virtual Rescue, the user finds himself in the middle of a cardiac arrest situation, either in an office park environment or in a hospital. The user then performs CPR on the victim. The virtual AED 3 assists and provides audio and visual feedback on the rate and depth of the compressions. Just as the AED 3 does in real life.

VR Lab developed three separate applications for the AED 3:

  • Virtual Rescue, a VR application for the HTC Vive. ZOLL uses this application at large trade fairs. This is the most immersive application. It provides the user with very accurate measurements of his or her CPR performance. A voice over guides the user through the experience.  In this application, a hand tracker fixed to the user’s hand. It is used to measure the depth and rate of the compressions during the CPR. ZOLL used this application at various trade shows including Arab Health 2018 in Dubai and the ERC Congress 2018 in Bologna, Italy. It draws many visitors to the ZOLL stand.
  • Virtual Rescue Mobile (VR Mobile), a VR app for iPhone and Samsung smartphone and the Oculus Go. This is a mobile-optimized version of Virtual Rescue. As 6DoF is currently lacking with these mobile devices, the app uses the sensors of mobile devices to measure the depth and rate of the compressions.
  • Virtual Rescue Hero (VR Hero), a VR app for iOS and Android. With this app, the user can watch a 360 degrees animated CPR rescue situation where the AED 3 is used. The user is a bystander. The 360 degrees video is essentially passive version of the interactive applications.

All three of these applications are now available in multiple languages. The current applications are solely meant for sales purposes, not for CPR or AED training.

Development of the application

During the development of the applications we faced several challenges. The sheer size of the project was a challenge by itself, as we had to develop three different types of applications for different devices, with multiple language options. For VR Mobile it was a challenge to provide good feedback on the CPR, using the limited capabilities of mobile devices and their sensors. Lastly, we had to keep the applications ‘exciting’ enough for modern users, especially the 360 degrees videos. We solved this by adding further animations, sounds and music. VR Lab cooperated with Juriën van Beek for the graphic designs and with Silvr for most of the development work in Unity.


While all of the Virtual Rescue applications are already in use, the project is still continuing. More languages will be added to the existing applications. Also variants for the AED Plus, another one of ZOLL’s AEDs, are in development. And there still remain plenty of ideas about extending the applications in other ways.