Third-generation wireless (the first two were analog and the current version of digital) can move data at 384 kilobits a second, six times the speed of a good computermodem.
To upload the data to a computer, a patient holds a small wand over his chest that picks up the data and transmits it through a modem to a Medtronic computer bank. (Future versions will be totally automatic and transmit wirelessly.) For now doctors mostly use the device to perform routine checkups remotely or to evaluate the device after it fires up.