Abstract:
A wrist band shaped device which can accurately warn when there is something wrong with heart by reducing interference of noise and by easily detecting heart condition in everyday life.

Description:
FIELD OF INVENTION 
       [0001]    This invention is about a device that alarms cardiac arrest or dangerous situations by transmitting an alarm by wireless when a change in blood flow by detecting a change in blood flow via a device which calculates and compares blood flow with bio signal acquired through preprocessor. This invention is composed of a device which detects blood flow in wrist when heart stops and transmits it by wire or wireless, a device which alarms, sensor part which consists of means to send visible ray and infrared ray and to receive optical sensor and preprocessor part which filters and amplifies noises from sensor part output signals 
       BACKGROUND OF INVENTION 
       [0002]    Arrhythmia is highly liable to develop into cardiac arrest. If cardiac arrest occurs while a patient sleeps, it may cause death. However, it is very difficult to cope with cardiac arrest caused by arrhythmia during everyday life. 
         [0003]    An effective way to treat cardiac arrest may be with a defibrillator. A defibrillator is a medical device that delivers an electric current, or “shock” to the chest of a cardiac arrest victim, which delivers that electric current to the victim&#39;s heart. The shock can interrupt the erratic electrical pulse of ventricular fibrillation of the heart during the cardiac arrest, which can give the victim&#39;s heart a chance to begin beating at its normal rhythm. 
         [0004]    During the first several minutes after a person suffers a cardiac arrest, every minute saved before defibrillation may mean about a 10 percent increase in relative survival rate. Therefore, as time is critical, there has been an increase in the availability of automated external defibrillators, or AEDs. AEDs are portable medical devices designed primarily for use by “first responders” (first to arrive at the scene of a medical emergency), such as police and fire departments. An AED generally has a built-in computer that evaluates a victim&#39;s heat rhythm to determine whether a shock is required. AEDs are also relatively easy to use as they typically include voice instructions and screen messages to assist in its operation, and thus, can be used by an average citizen with little or no training. 
         [0005]    Therefore an optimum device which is very simple and convenient to use in everyday life is necessary to effectively alarm cardiac arrest caused by arrhythmia and an alarm should be designed in such a manner that can effectively warn situations relating to cardiac arrest in everyday life. 
         [0006]    This cardiac arrest alarm is system that detects whether blood flow is normal and oxygen saturation in blood in phenomena which vary depending on heart pulsation and amount of oxygen which combines with hemoglobin when infrared ray coming from radiating part and visible ray with specific wavelength reaches a part which receives rays passing through skin and bio tissues and if blood flow or oxygen saturation is below standard and warns by sending a signal to an alarm or devices designated. 
       SUMMARY OF INVENTION 
       [0007]    The purpose of this wrist band shaped invention is to easily detect the condition of heart in daily life and to accurately warn when there is something wrong with heart by reducing noise. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0008]      FIG. 1  illustrates a sensor circuit diagram in parts which send and receive infrared ray in wrist attached band. 
           [0009]      FIG. 2  illustrates a block diagram of sensor, preprocessor part, first comparator and alarm transmitting part. 
           [0010]      FIG. 3  illustrates a alarm wireless receiving part and warning speaker. 
           [0011]      FIG. 4  illustrates a diagram about classification of pulsation. 
       
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
       [0012]    Accurate measurement of blood flow is required to achieve the purpose of this invention. Wrist connecting side  10  and parts that send rays  20 ,  21  require means to closely attach in order to remove outside noise. This invention should be shaped like a decoration such as a ring for convenience in everyday life and parts including sensors should be miniaturized. 
         [0013]    Existing devices to alarm heart attack are almost impossible to use in everyday life because they were designed to be worn in fingers or toes. The detector of this invention can measure precisely like medical instrument and it is convenient to wear and carry. 
         [0014]    Therefore this invention is an effective device that can minimize a danger by sending an alarm a place designated or set by a user through aforementioned detector in case of sudden death caused by arrhythmia which a patient suffers while sleeping. 
         [0015]    This invention will be examined by referring to drawings. If it is deemed that detailed description of technologies or compositions makes summary of this invention unclear, the detailed description will be left out. 
         [0016]    Terms that will be described later and defined considering functions in this invention are subject to change by intention or practice of user or operator and the definitions should be made based on contents in this statement that describes this invention. 
         [0017]    Visible ray and infrared ray that are sent to radiating part  20  at wrist connecting side band  10  in  FIG. 1  which are received in a part  21  and  FIG. 2  is composed of preprocessor  22  which is made up of noise filter  23  and amplification part  24  and noise is removed at noise filter and heart rate depending on blood flow from bio signal which is extracted via amplification part  24  is calculated and when it becomes bradycardia  41  which blood flow drops remarkably at first comparative part  25  compared with normal pulse  40  in  FIG. 4  and it is sent to detecting part  31  in  FIG. 3  from alarm transmitting part  26  in  FIG. 2  and second comparative part  32  determines whether it is warning signal and an alarm is sent to amplifier, speaker and blue tooth smart phone device  33 . 
         [0018]    Alarm transmitting part  26  in  FIG. 2  should be wireless one but can be wire one if necessary. Making signal digital transmission through encoding to reduce errors helps minimize error range. 
         [0019]    Moreover, this warning device will be using as a sleeping monitoring band during sleep. 
         [0020]    While certain exemplary techniques have been described and shown herein using various methods and systems, it should be understood by those skilled in the art that various other modifications may be made, and equivalents may be substituted, without departing from claimed subject matter. Additionally, many modifications may be made to adapt a particular situation to the teachings of claimed subject matter without departing from the central concept described herein. Therefore, it is intended that claimed subject matter not be limited to the particular examples disclosed, but that such claimed subject matter also may include all implementations falling within the scope of the appended claims, and equivalents thereof.