Patent ID: 11864919
Assignee: W.L. GORE & ASSOCIATES GMBH
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A  G

Claim 0:
1. A method for compensating for shifts in resonant frequency due to dielectric properties of a surrounding medium and non-pressure related mechanical deformations in an inductor-capacitor pressure sensor located in a circulatory vessel, the method comprising:
measuring the resonant frequency of a pressure-sensing LC tank circuit while the pressure-sensing LC tank circuit is within a circulatory vessel;
measuring the resonant frequency of a first reference LC tank circuit while the first reference LC tank circuit is within the circulatory vessel;
measuring the resonant frequency of a second reference LC tank circuit while the second reference LC tank circuit is within the circulatory vessel; and
determining a corrected capacitance of the pressure-sensing LC tank circuit utilizing the resonant frequencies of the first and second reference LC tank circuits using the equation:, C
   
    1
    ⁢
    V
   
  
  =
  
   
    
     
      
       m
       1
      
      -
      
       m
       2
      
     
     
      
       m
       3
      
      -
      
       m
       2
      
     
    
    ⁢
    
     (
     
      
       C
       3
      
      -
      
       C
       2
      
     
     )
    
   
   +
   
    C
    2
   
  
 

wherein C1V is a corrected capacitance of the pressure-sensing LC tank circuit, C2 is the capacitance of the first reference LC tank circuit, and C3 is the capacitance of the second reference LC tank circuit; and
2 wherein m1 is defined as, (
   
    1
    
     2
     ⁢
     π
     ⁢
     
      f
      1
     
    
   
   )
  
  2
 

 with f1 being the resonant frequency of the pressure-sensing LC tank circuit, m2 is defined as, (
   
    1
    
     2
     ⁢
     π
     ⁢
     
      f
      2
     
    
   
   )
  
  2
 

 with f2 being the resonant frequency of the first reference LC tank circuit, and m3 is defined as, (
   
    1
    
     2
     ⁢
     π
     ⁢
     
      f
      3
     
    
   
   )
  
  2
 

 with f3 being the resonant frequency of the second reference LC tank circuit.