Non-invasive detection of the occurrence of apneae or hypopneae in a patient
First Claim
1. A device for non-invasive detection of the occurrence of apnea or hypopnea in a patient, comprising:
- means for collecting the patient'"'"'s endocardial acceleration, comprising an external acceleration sensor able to maintain contact with the patient'"'"'s thoracic wall, andmeans for analysis, able to;
determine at least one parameter value by evaluating a function of a ratio of a long term average of the values of the endocardial acceleration peaks to a short term average of the values of endocardial acceleration peaks collected over a plurality of successive cycles;
compare the at least one parameter value to a first predetermined threshold; and
deliver an apnea or hypopnea alert signal in response to the at least one parameter value crossing the first predetermined threshold.
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Accused Products
Abstract
A device for the non-invasive detection of apneae or hypopneae in a patient. This apparatus collects the patient'"'"'s endocardial acceleration using an external acceleration sensor (12) able to be maintained in contact with the patient'"'"'s thoracic wall (10). An analysis is made to determine at least one parameter that is function of collected endocardial acceleration and to conditionally deliver an apnea or hypopnea alert signal as a function of the value taken by this parameter. This parameter can notably be a function of one and/or the other of the two endocardial acceleration peaks over one given heart cycle, the first peak (PEA I) corresponding to the ventricular isovolumetric contraction phase and the second peak (PEA II) to the ventricular isovolumetric relaxation phase.
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Citations
24 Claims
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1. A device for non-invasive detection of the occurrence of apnea or hypopnea in a patient, comprising:
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means for collecting the patient'"'"'s endocardial acceleration, comprising an external acceleration sensor able to maintain contact with the patient'"'"'s thoracic wall, and means for analysis, able to; determine at least one parameter value by evaluating a function of a ratio of a long term average of the values of the endocardial acceleration peaks to a short term average of the values of endocardial acceleration peaks collected over a plurality of successive cycles; compare the at least one parameter value to a first predetermined threshold; and deliver an apnea or hypopnea alert signal in response to the at least one parameter value crossing the first predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device for non-invasive detection of the occurrence of apnea or hypopnea in a patient, comprising:
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means for collecting the patient'"'"'s endocardial acceleration comprising an external acceleration sensor able to maintain contact with the patient'"'"'s thoracic wall; means for determining at least one parameter value by evaluating a function of a ratio between a long term average of the values of the endocardial acceleration peaks to a short term average of the values of endocardial acceleration peaks collected over a plurality of successive cycles; means for comparing the at least one parameter to a first threshold; and means for delivering an alert signal corresponding to an apnea or a hypopnea in response to the at least one parameter value crossing the first predetermined threshold. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification