Patent ID: 8659435

Claim:
A system for monitoring the vitality of a person comprising: a waterproof sensor configured to be mounted to a person, the sensor further configured to periodically sense the person's heart activity and produce an electrical signal indicative thereof, the waterproof sensor having unique identification information so it can be identified from other sensors worn by other persons; a waterproof monitor comprising memory; a microprocessor electrically coupled to the sensor and configured to receive the electrical signal indicative of the person's heart activity, the microprocessor further configured to store a succession of the electrical signals received from the sensor in the memory and determine if the person's heart is stopped based on the stored succession of electrical signals; a location monitoring system for determining a location of the waterproof sensor; an optical transmitter having a light source and coupled to the microprocessor, the microprocessor being further configured to produce an optical alarm signal using the light source when the microprocessor has determined the person's heart is stopped, wherein the optical alarm signal is modulated so that it the signal from the optical transmitter includes the unique identification information that identifies the waterproof sensor to identify the person wearing the waterproof sensor and includes location information to determine the location of the waterproof sensor; an optical receiver comprising a detector configured to receive the optical alarm signal, the optical receiver configured to transform the alarm signal and communicate the transformed alarm signal; and a computer configured to receive the transformed alarm signal and determine the identity of the person to which the waterproof sensor is attached, determine the location of the waterproof sensor, and activate an alarm based on the transformed alarm signal.