Apparatus and method for determining a physiological condition
First Claim
1. A method of alerting a patient to the probability of the presence of hypoglycaemia, the method comprising:
- receiving, via an input of an apparatus, at least two physiological parameters corresponding to a patient state at time Ts from a group of physiological parameters comprising heart rate or pulse, heart rate variability, skin impedance, perspiration, body temperature, skin temperature, respiration frequency, respiration effort, eye movement, muscle tonus, a measurement obtained by electrooculogram (EOG), an oxygen saturation measurement, blood pressure, a carbon dioxide content of blood, and a non-invasive blood glucose measurement, and a blood glucose level;
using a processor of the apparatus, determining, from the at least two physiological parameters, a result signal indicative of the presence or onset of hypoglycaemia by processing the received physiological parameters to identify one of a plurality of entries of a look-up table, wherein each entry of the look-up up table begins as an initial set of pre-calculated probabilities of the presence or onset of hypoglycaemia, the pre-calculated probabilities being determined by an adaptive learning algorithm from previously monitored physiological parameters of the person;
wherein a loop begins with a counter τ
at the beginning of a predetermined period of time and the at least two physiological parameters are modified by a weighting parameter λ
, wherein the most recent physiological parameters are weighted more than the older physiological parameters wherein the counter τ
is provided as;
τ
=Ts−
30wherein the predetermined period of time is 30 minutes, and if τ
<
1, τ
is set to 1 instead;
wherein the initial set of pre-calculated probabilities are adjusted by a correction term γ
that determines the relative weight of the probabilities at time τ and
at time τ
−
1;
wherein entries of the look-up table are subsequently updated during operation based on feedback received from the patient, thereby providing an adaptive detection apparatus where the probabilities in the look-up table are both adaptive with respect to the individual patient and with respect to a development of the patient over time; and
generating a notification, using the apparatus, of the result signal indicative of the presence or onset of hypoglycaemia.
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Abstract
An apparatus for detecting a physiological condition in a person, comprising input structure for receiving at least two physiological parameters, processing structure for determining, from the received physiological parameters, a result signal indicative of the presence or onset of said physiological condition, and output structure for generating an output indicative of the result signal. The apparatus further comprises storage structure for storing a look-up table comprising a plurality of entries, each entry corresponding to a pre-calculated probability of the presence or onset of said physiological condition, the pre-calculated probabilities being determined by way of a mathematical process from previously monitored physiological parameters; and the processing means is adapted to process the received at least two physiological parameters to identify one of the plurality of entries of the look-up table, and to determine said result signal from the identified entry of the look-up table.
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Citations
19 Claims
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1. A method of alerting a patient to the probability of the presence of hypoglycaemia, the method comprising:
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receiving, via an input of an apparatus, at least two physiological parameters corresponding to a patient state at time Ts from a group of physiological parameters comprising heart rate or pulse, heart rate variability, skin impedance, perspiration, body temperature, skin temperature, respiration frequency, respiration effort, eye movement, muscle tonus, a measurement obtained by electrooculogram (EOG), an oxygen saturation measurement, blood pressure, a carbon dioxide content of blood, and a non-invasive blood glucose measurement, and a blood glucose level; using a processor of the apparatus, determining, from the at least two physiological parameters, a result signal indicative of the presence or onset of hypoglycaemia by processing the received physiological parameters to identify one of a plurality of entries of a look-up table, wherein each entry of the look-up up table begins as an initial set of pre-calculated probabilities of the presence or onset of hypoglycaemia, the pre-calculated probabilities being determined by an adaptive learning algorithm from previously monitored physiological parameters of the person; wherein a loop begins with a counter τ
at the beginning of a predetermined period of time and the at least two physiological parameters are modified by a weighting parameter λ
, wherein the most recent physiological parameters are weighted more than the older physiological parameters wherein the counter τ
is provided as;
τ
=Ts−
30wherein the predetermined period of time is 30 minutes, and if τ
<
1, τ
is set to 1 instead;wherein the initial set of pre-calculated probabilities are adjusted by a correction term γ
that determines the relative weight of the probabilities at time τ and
at time τ
−
1;wherein entries of the look-up table are subsequently updated during operation based on feedback received from the patient, thereby providing an adaptive detection apparatus where the probabilities in the look-up table are both adaptive with respect to the individual patient and with respect to a development of the patient over time; and generating a notification, using the apparatus, of the result signal indicative of the presence or onset of hypoglycaemia. - View Dependent Claims (2, 3, 4, 5)
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6. A method for detecting a probability of hypoglycaemia in a person, the method comprising:
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providing a storage device adapted to store a look-up table comprising a plurality of entries, wherein each entry is a pre-calculated probability of the presence or onset of hypoglycaemia and each entry begins as an initial set of pre-calculated probabilities, the pre-calculated probabilities being determined by an adaptive learning algorithm from previously monitored physiological parameters of the person corresponding to a patient state at time Ts; providing a processor adapted to receive at least two physiological parameters and identify one of the plurality of entries of the look-up table, wherein the identification comprises comparison of at least two physiological parameters against stored values of the look-up table, and wherein the processor is further adapted to determine, from the received physiological parameters, a result signal indicative of the presence or onset of hypoglycaemia wherein the entries of the look-up table are subsequently updated during operation based on feedback received from the patient; wherein a loop begins with a counter τ
at the beginning of a predetermined period of time and the at least two physiological parameters are modified by a weighting parameter λ
, wherein the most recent physiological parameters are weighted more than the older physiological parameters wherein the counter τ
is provided as;
τ
=Ts−
30wherein the predetermined period of time is 30 minutes, and if τ
<
1, τ
is set to 1 instead;wherein the initial set of pre-calculated probabilities are adjusted by a correction term γ
that determines the relative weight of the probabilities at time τ and
at time τ
−
1;wherein entries of the look-up table are subsequently updated during operation based on feedback received from the patient, thereby providing an adaptive detection apparatus where the probabilities in the look-up table are both adaptive with respect to the individual patient and with respect to a development of the patient over time; providing an output device adapted to generate an output indicative of the result signal corresponding to a pre-calculated probability of the presence or onset of hypoglycaemia; receiving a user input indicative of the presence or absence of hypoglycaemia wherein the processor is further adapted to update at least the identified entry of the look-up table according to the adaptive learning algorithm process and in response to a user input indicative of the presence or absence of hypoglycaemia and/or a received measured quantity indicative of the presence of hypoglycaemia. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification