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A simple and inexpensive fluorescein detector is described that is capable of detecting a solution of approximately one part fluorescein to five million parts of water. The device can be constructed in a laboratory or workshop equipped with the minimum tools and instrumentation. As conceived, the device is used as a leak detector and is designed to activate a relay when an aqueous fluorescein solution exceeding a concentration of one part per five million flows through a quartz tube.

Logic circuitry has been added to an electrocardiogram telephone transmitter. It processes the electrocardiogram and permits frequent self-checks by the patient on rate, capture and sensing function of an implanted demand pulse generator system. Correct function is communicated to the patient by a green light. Malfunction with regard to any of these parameters produces an irreversible yellow light signaling the patient to contact his physician. The self-check is reassuring to the patient during intervals between visits to the physician's office or a specialized clinic. The system, at present, is applicable only to demand pulse generators with a high magnet test rate (90 ppm or higher) which assures capture in virtually all patients. This and other limitations are discussed. Their incidence is low, some can be remedied and in the majority of patients they do not impair the clinical usefulness of the system.

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