In the case of the above implant, open hardware specifications would have been needed: the stock of replacement hardware (the computing device worn on the body)

In the case of the above implant, open hardware specifications would have been needed: the stock of replacement hardware (the computing device worn on the body) is limited. The Spectrum article gives an example of a patient that had to work with his doctor and hunt for unused devices to replace a device that was damaged from a drop.