Biological signal transmission apparatus

Abstract

An electrode 4 for detecting a biological signal and a loop antenna 3 are integrally mounted on a support 2 placed on the surface of a living body and a transmitter 5 is placed on the support 2. A biological signal detected on the electrode 4 is input through a connector 11 to electric circuitry 10 of the transmitter 5 and an electric signal processed by the electric circuitry 10 is output through connectors 12 and 13 to both ends of the loop antenna 3 from which the biological signal is emitted to a receiver. At this time, the opening face of the loop antenna 3 is in a direction almost perpendicular to the surface of a living body for improving sensitivity.

What is claimed is:  
     
         1 . A biological signal transmission apparatus comprising: 
 at least one electrode for detecting a biological signal;    a support for supporting said electrode, said support being placed on a living body surface;    a transmitter having electric circuitry for processing the biological signal detected on said electrode; and    two loop antennas for emitting the biological signal processed by the electric circuitry to a receiver, said loop antennas being disposed in such a manner that opening faces are placed in a direction almost perpendicular to the living body surface and are almost at right angles to each other.    
     
     
         2 . The biological signal transmission apparatus as claimed in  claim 1  wherein at least one of said loop antennas is contained in said transmitter.  
     
     
         3 . The biological signal transmission apparatus as claimed in  claim 1  wherein at least one of said at least one loop antennas is divided into two parts, wherein one loop antenna division part is disposed in said support and the other is disposed in said transmitter, such that when said transmitter is attached to said support, the loop antenna division parts are connected into one piece.  
     
     
         4 . The biological signal transmission apparatus as claimed in  claim 1  wherein said support and said transmitter have connection members for connecting to each other and, wherein said loop antennas are integral with said support and connected to an output of the electric circuitry through said connection members when said transmitter is placed on said support.  
     
     
         5 . A biological signal transmission apparatus comprising: 
 at least one electrode for detecting a biological signal;    a support for supporting said electrode, said support being placed on a living body surface;    a transmitter having electric circuitry for processing the biological signal detected on said electrode;    at least one loop antenna for emitting the biological signal processed by the electric circuitry to a receiver, said loop antenna being disposed so that an opening face is placed in a direction almost perpendicular to the living body surface; and    a microstrip antenna having a radiation plate and a base plate opposed in parallel with the living body surface, the base plate being placed nearer to the living body surface.    
     
     
         6 . A biological signal transmission apparatus comprising: 
 at least one electrode for detecting a biological signal;    a support for supporting said electrode, said support being placed on a living body surface;    a transmitter having electric circuitry for processing the biological signal detected on said electrode;    two loop antennas for emitting the biological signal processed by the electric circuitry to a receiver, said loop antennas being disposed so that opening faces are placed in a direction almost perpendicular to the living body surface and are almost at right angles to each other; and    a microstrip antenna having a radiation plate and a base plate opposed in parallel with the living body surface, the base plate being placed nearer to the living body surface.    
     
     
         7 . The biological signal transmission apparatus as claimed in  claim 5  wherein at least one of said loop antennas and said microstrip antenna is contained in said transmitter.  
     
     
         8 . The biological signal transmission apparatus as claimed in  claim 5  wherein at least one of said loop antennas and said microstrip antenna is integral with said support and said loop antenna or said microstrip antenna is connected to output of the electric circuitry through a connection member and wherein said transmitter is placed on said support.  
     
     
         9 . A biological signal transmission apparatus comprising: 
 at least one electrode for detecting a biological signal;    a support for supporting said electrode, said support being placed on a living body surface;    a transmitter having electric circuitry for processing the biological signal detected on said electrode; and    a microstrip antenna having a radiation plate and a base plate opposed in parallel with the living body surface, the base plate being placed nearer to the living body surface.    
     
     
         10 . The biological signal transmission apparatus as claimed in  claim 9  wherein said microstrip antenna is contained in said transmitter.  
     
     
         11 . The biological signal transmission apparatus as claimed in  claim 9  wherein said microstrip antenna is integral with said support and is connected to output of the electric circuitry through a connection member and wherein said transmitter is placed on said support.  
     
     
         12 . The biological signal transmission apparatus as claimed in  claim 8 , wherein at least one of said two loop antennas and said microstrip antenna is contained in said transmitter.  
     
     
         13 . The biological signal transmission apparatus as claimed in  claim 8 , wherein at least one of said two loop antennas and said microstrip antenna is integral with said support and wherein one of either said loop antenna and said microstrip antenna integral with said support is connected to an output of the electric circuitry through a connection member and wherein said transmitter is placed on said support.