Patent ID: 11963793
Assignee: ROPAMEDICS LLC
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 6:
7. A system for providing an indication of pain of a person, comprising:
a light source configured to be placed in proximity of the person's head, wherein the light source emits light in first and second wavelength regions of an electromagnetic spectrum;
an optical sensor configured to be placed in proximity of the person's head, wherein the optical sensor detects light in said first and second wavelength regions of the electromagnetic spectrum to provide a detection signal corresponding to a plurality of prior moments of time;
a controller configured to communicate with the optical sensor to receive said detection signal for said plurality of prior moments of time, the controller comprising a processor configured to provide oxygen content data of at least a portion of the person's brain proximate the light source and optical sensor based on detected light for the plurality of prior moments of time,
wherein the controller is further configured with a hemodynamic predictive model to provide said indication of pain based on said detection signal for said plurality of prior moments of time,
wherein the controller is further configured to apply a stability analysis on said hemodynamic predictive model to calculate a pain level of the person based on said stability analysis in real time by use of the detection signal as input to the hemodynamic predictive model for the plurality of prior moments of time to provide the indication of pain of the person, and
wherein said hemodynamic predictive model comprises a plurality of parameters that have values that are determined based on the detection signal corresponding to the plurality of prior moments of time,
wherein said hemodynamic predictive model is represented in a time domain as, λ
    i
   
   (
   t
   )
  
  =
  
   
    
     ∑
     
      k
      =
      1
     
     M
    
     
    
     
      a
      
       i
       ,
       k
      
     
     ×
     
      
       λ
       i
      
      (
      
       t
       -
       k
      
      )
     
    
   
   +
   
    
     ∑
     
      p
      =
      1
     
     N
    
     
    
     
      b
      
       i
       ,
       p
      
     
     ×
     
      
       λ
       RED
      
      (
      
       t
       -
       p
      
      )
     
    
   
  
 

where:
1≤i≤n, n being the number of infrared wavelengths and i being an index over the infrared wavelengths;
λi being a light signal at the ith infrared wavelength;
λRED=a light signal at a red light wavelength;
t=time;
ai and bi are weights with which each light signal at the red wavelength and the infrared wavelength, respectively, contributes to a hemodynamic history; and
M and N are the number of light signal samples included in the hemodynamic history.