Abstract: An ECG recorder is provided that includes a processor configured to perform the ECG data sampling routine while performing additional routines, such as transmitting stored ECG events and setting user preferences. Accordingly, a patient's ECG signal is continuously sampled at all times during operation of the recorder.

Abstract: A DC to DC converter particularly suited for use to boost or reduce the voltage with single battery systems allows insertion of the battery in either polarity through use of a symmetrical arrangement of solid-state switches which alternate charging an inductor for the DC to DC converter operation and establishing a ground depending on the polarity of the battery. The use of a solid-state switch to establish a ground avoids the severe voltage drop required of rectifier systems.

Abstract: A battery holder for axial-type dry cells, alkaline or other, has opposed faces for abutting either terminal of the battery and supporting two conductors, a center conductor contacting only the positive terminal of the battery and a flanking outer conductor contacting only the negative terminal of the battery depending on which terminal of the battery abuts the inner face. Center conductors are joined by a wire as are the flanking outer conductors so that the battery provides a single polarity of voltage through the wires regardless of the direction of its insertion within the battery holder. The center conductor is recessed within a groove to stabilize the battery and to prevent shorting of the different conductors by the battery terminals.

Abstract: A memory loop recorder records electrocardiographic data in a random access memory for transmission to a remote display terminal via telephone line. The ECG data in the loops is transmitted in reverse time-order to the display from a point related to the occurrence of symptoms. The remote display terminal displays the transmitted data from right to left thus correcting the time access of the graphical display but allowing more rapid diagnosis of the critical ECG data.

Abstract: A miniature multi-lead bio-telemetry and patient location systems includes one or more stationary location markers which transmit location data to an ECG unit worn by ambulatory patients. The electrocardiogram (ECG) unit monitors patient ECG data, a distress button and ECG unit status and combines this data with the location data received from one location marker and retransmits this combined data to a stationary receiver which may display the ECG data the system status data and the location data.