Abstract: An ambulatory data recorder with enhanced infrared data transfer. In particular, the device features an infrared transmitter port having a multi-plane lens. The port, lens and recorder enclosure work together to permit a reliable infrared data link to be established between the recorder and a line voltage device even while the recorder is in a variety of positions. That is, the infrared data link may be established when the device is worn, of when the device is placed on a table in a variety of positions.

Abstract: An ambulatory recorder having an enhanced ergonomic case is described. The case has a smooth curved semi-circular surface within a first plane along the top surface while further having an at least partially curved surface along a second end. These curved surfaces render the recorder less likely to be caught on objects or on the patient's arms or hands while worn. The recorder is thus more comfortable to wear and operate.

Abstract: An ambulatory data recorder having a slidable patient activity period switch. The slidable patient activity period switch permits the patient to slide the switch from a first position to a second position upon the start of a pre-defined activity, e.g. eating. Upon completion of the pre-defined activity, the switch is slide from the second position back to the first position. While in either the first or second position the switch position corresponds to a marking on the recorder enclosure such that the patient can readily understand which activity the switch is indicating. The slidable patient activity period switch is further configured to have minimal power consumption. In one embodiment the switch is provided through a standard keyboard interrupt service routine.

Abstract: An ambulatory data recorder having a selectable device control interface. The selectable device control interface permitting a selection to be made between a first device control interface, in which the full device control set is accessible, and a second control interface, in which only a partial amount of the device control set is accessible. Typically the first control interface is intended for use by physicians and the second control interface is intended for use by patients. The selectable device control interface is provided by a combination of device controls and a moveable device cover. The cover moveable from a first opened position in which the full device control set is accessible and a second closed position in which only a partial amount of the device control set is accessible. Preferably the cover permits operation of at least one of the device controls regardless of its position.