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Method and apparatus for deriving a health index for determining cardiovascular health

  • US 9,232,915 B2
  • Filed: 12/01/2011
  • Issued: 01/12/2016
  • Est. Priority Date: 01/20/2011
  • Status: Active Grant
First Claim
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1. A computer implemented method of deriving a health index for determining cardiovascular health of a subject;

  • the method performed by a computing device and comprising(i) obtaining values of at least two parameters from one or more PPG signals of the subject, the at least two parameters including Sp02 and at least one other parameter related to Sp02;

    (ii) assigning, using the computing device, a score using the values of the at least two related parameters from a reference scoring system, wherein the reference scoring system is derived, using the computing device, bylisting all possible permutations of the at least two parameters in a list, each permutation corresponding to a preliminary band classification and a preliminary score;

    checking the list against a list of impossible combinations and atypical combinations;

    identifying, using the computing device, which of the possible permutations in the list falls within the list of impossible combinations and atypical combinations and marking the identified possible permutations;

    manipulating, using the computing device, the preliminary band classification of the possible permutations identified as atypical combinations;

    manipulating, using the computing device, the preliminary scores corresponding to the manipulated preliminary band classifications based on predefined scores and band classification relationships;

    deriving, using the computing device, a plurality of groupings for each parameter from the list of possible permutations and the manipulated scores and band classifications;

    each grouping including a range of readings for the respective parameter and is associated with a corresponding score for assigning to, and dependence on, the obtained values; and

    (iii) deriving, using the computing device, the health index based on the assigned score;

    wherein the health index is derived by deriving a preliminary health index from the groupings for each parameter based on the obtained values and verifying if a combination of the groupings is medically possible, and further verifying if the preliminary health index requires corrective adjustment based on the combination of the groupings.

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