Patent Publication Number: US-2007100244-A1

Title: Wrist-worn monitor for heartbeat detection

Description:
BACKGROUND OF THE INVENTION  
      1. Field of the Invention  
      This invention relates to a wrist-worn monitor for heartbeat detection, in particular to a monitor worn on a wrist to get the reading of heartbeat easily.  
      2. Background of the Related Prior Art  
      A conventional heartbeat monitor currently used on an exercising or medical equipment has become to be wireless, which is convenient in use. As shown in  FIG. 5 , a monitor A comprises two detecting sections A 1  extending from respective sides. Each detecting section A 1  has a detecting terminal A 11  and a locking hole A 12  at the endmost. A strap B comprises a buckle B 1  at the endmost to connect with the locking hole A 12  to secure the strap B to the chest of a person with the detecting sections A 1  of the monitor A being in touch with the front of the person&#39;s chest so as to monitor the heartbeat of that person. The signal from the monitor A is transmitted to a receiver C adjacent to the monitor A.  
      However, the monitor has some shortcomings: 
      1. After exercise, the person&#39;s breath will increase, which makes the user difficult in breath.     2. When a female uses the monitor, the monitor will have difficulty to be in contact with the chest for monitoring.     3. The buckle will cause the user uncomfortable, in particular when they are doing exercise.    

     SUMMARY OF THE INVENTION  
      It is the primary object of the present invention to provide a wrist-worn monitor for heartbeat detection, which is worn to a users&#39; wrist so that the user has no uncomfortable feeling.  
      It is another object of the present invention to provide a wrist-worn monitor for heartbeat detection, which is light in weight and easy to operate.  
      The present invention includes a detecting device provided on a belt. The detecting device comprises a first detecting element on one side and a pair of second detecting elements on another side. When the belt is worn on a wrist of a user, the first detecting element will be in touch with the skin while the user presses the second detecting elements with two fingers of another hand to get the reading of his/her heartbeat. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       FIG. 1  is a perspective view of the present invention;  
       FIG. 2  is a circuit diagram of the present invention;  
       FIG. 3  is a perspective view of the present invention in an operating status;  
       FIG. 4  is a perspective view of a second embodiment of the present invention, and  
       FIG. 5  is perspective view of a conventional heartbeat monitor in an operating status.  
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
      As shown in  FIG. 1 , the present invention comprises a belt  1  and a detecting device  2 .  
      The belt  1  is worn to a user&#39;s wrist. The detecting device  2  is provided on the belt  1 . The detecting device  2  comprises a screen  21  on one side and a first detecting element  22  on the other side thereof. A pair of second detecting elements  23  and  24  connected with the detecting device  2  is provided on the belt  1 .  
      As shown in  FIG. 2 , the detecting device  2  comprises a difference amplifier  25  therein. The difference amplifier  25  has contacts connected to the first detecting element  22  and the second detecting elements  23  and  24 , respectively, so that all signals detected by the contacts will be transformed to a digit to show on the screen  21  of the detecting device  2 .  
      To operate the present invention, as shown in  FIG. 3 , the belt  1  is worn on a user&#39;s wrist with the first detecting element  22  in touch with the skin. The user uses two fingers of the other hand to press the second detecting elements  23  and  24 . This constitutes a circuit. A mini current will flow through the two hands to the user&#39;s chest to measure the heartbeat and then send the result to the difference amplifier  25  of the detecting device  2 . The difference amplifier  25  filters out inadequate signal and sends the frequency in a pulse wave to the detecting device  2  to be transformed to a digit for showing on the screen  21 .  
      The first detecting element  22 , as described above, is designed to be in touch with the wrist.  FIG. 4  shows a second embodiment of the present invention. Two detecting elements  23 A and  24 A are provided at the bottom of a bolt  1 A to be in touch with the wrist, while the user uses one finger to press a first detecting element  22 A provided on the belt  1 A. The result will be the same as the first embodiment as descried above.