Patent ID: 11883133
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Measurement (Instruments)
Classification: CPC A  G | IPC A

Claim 0:
1. An in-vivo temperature measurement device comprising:
a plurality of thermal resistors;
a plurality of first temperature sensors at a first end of the plurality of thermal resistors configured to face a living body;
a plurality of second temperature sensors provided at a second end of the plurality of thermal resistors opposite to the first end;
a memory configured to store an estimation model of a core temperature of the living body according to a non-thermal equilibrium state of the living body and thermal resistance values of the plurality of thermal resistors; and
an arithmetic circuit configured to estimate the core temperature of the living body based on the estimation model, the thermal resistance values, and a plurality of temperatures measured by the plurality of first temperature sensors and the plurality of second temperature sensors;
wherein the first temperature sensors are configured to measure a first temperature indicating an epidermis temperature of the living body;
wherein the second temperature sensors are configured to measure a second temperature at a position away from the living body;
wherein the thermal resistance values of the plurality of thermal resistors are different from one another; and
wherein the estimation model is represented by a following expression:, T
      C
    
    =
    
      
        
          
            
              
                
                  T
                  1
                
                ⁡
                
                  (
                  
                    
                      
                        T
                        
                          S
                          ⁢
                          
                            
                          
                          ⁢
                          2
                        
                        ′
                      
                      ⁢
                      
                        T
                        
                          S
                          ⁢
                          
                            
                          
                          ⁢
                          3
                        
                      
                    
                    -
                    
                      
                        T
                        
                          S
                          ⁢
                          
                            
                          
                          ⁢
                          3
                        
                        ′
                      
                      ⁢
                      
                        T
                        
                          S
                          ⁢
                          
                            
                          
                          ⁢
                          2
                        
                      
                    
                  
                  )
                
              
              +
              
                
                  
                    R
                    
                      S
                      ⁢
                      
                        
                      
                      ⁢
                      1
                    
                  
                  
                    R
                    
                      S
                      ⁢
                      
                        
                      
                      ⁢
                      2
                    
                  
                
                ⁢
                
                  
                    T
                    2
                  
                  ⁡
                  
                    (
                    
                      
                        
                          T
                          
                            S
                            ⁢
                            
                              
                            
                            ⁢
                            3
                          
                          ′
                        
                        ⁢
                        
                          T
                          
                            S
                            ⁢
                            
                              
                            
                            ⁢
                            1
                          
                        
                      
                      -
                      
                        
                          T
                          
                            S
                            ⁢
                            
                              
                            
                            ⁢
                            1
                          
                          ′
                        
                        ⁢
                        
                          T
                          
                            S
                            ⁢
                            
                              
                            
                            ⁢
                            3
                          
                        
                      
                    
                    )
                  
                
              
              +
            
          
        
        
          
            
              
                
                  R
                  
                    S
                    ⁢
                    
                      
                    
                    ⁢
                    1
                  
                
                
                  R
                  
                    S
                    ⁢
                    
                      
                    
                    ⁢
                    3
                  
                
              
              ⁢
              
                
                  T
                  3
                
                ⁡
                
                  (
                  
                    
                      
                        T
                        
                          S
                          ⁢
                          
                            
                          
                          ⁢
                          1
                        
                        ′
                      
                      ⁢
                      
                        T
                        
                          S
                          ⁢
                          
                            
                          
                          ⁢
                          2
                        
                      
                    
                    -
                    
                      
                        T
                        
                          S
                          ⁢
                          
                            
                          
                          ⁢
                          2
                        
                        ′
                      
                      ⁢
                      
                        T
                        
                          S
                          ⁢
                          
                            
                          
                          ⁢
                          1
                        
                      
                    
                  
                  )
                
              
            
          
        
      
      
        
          
            T
            1
          
          ⁡
          
            (
            
              
                T
                
                  S
                  ⁢
                  
                    
                  
                  ⁢
                  2
                
                ′
              
              -
              
                T
                
                  S
                  ⁢
                  
                    
                  
                  ⁢
                  3
                
                ′
              
            
            )
          
        
        +
        
          
            
              R
              
                S
                ⁢
                
                  
                
                ⁢
                1
              
            
            
              R
              
                S
                ⁢
                
                  
                
                ⁢
                2
              
            
          
          ⁢
          
            
              T
              2
            
            ⁡
            
              (
              
                
                  T
                  
                    S
                    ⁢
                    
                      
                    
                    ⁢
                    3
                  
                  ′
                
                -
                
                  T
                  
                    S
                    ⁢
                    
                      
                    
                    ⁢
                    1
                  
                  ′
                
              
              )
            
          
        
        +
        
          
            
              R
              
                S
                ⁢
                
                  
                
                ⁢
                1
              
            
            
              R
              
                S
                ⁢
                
                  
                
                ⁢
                3
              
            
          
          ⁢
          
            
              T
              3
            
            ⁡
            
              (
              
                
                  T
                  
                    S
                    ⁢
                    
                      
                    
                    ⁢
                    1
                  
                  ′
                
                -
                
                  T
                  
                    S
                    ⁢
                    
                      
                    
                    ⁢
                    2
                  
                  ′
                
              
              )
            
          
        
      
    
  
  ,

wherein Tc indicates the core temperature at a measurement time t, RSi (i=1, 2, 3) indicates a corresponding thermal resistance value of each of the plurality of thermal resistors, TSi (i=1, 2, 3) indicates a corresponding first temperature measured by each of the plurality of first temperature sensors, Ti, =(TSi(t)-TUi(t)), TUi (i=1, 2, 3) indicates a corresponding second temperature measured by each of the plurality of second temperature sensors, and TSi′=dTSi(t)/dt.