Glycemic control monitoring using implantable medical device
First Claim
1. An apparatus for monitoring a patient'"'"'s blood glucose level, the apparatus comprising:
- (i) an implantable medical device having a controller;
(ii) an implantable heart sounds sensor configured to transmit signals to the controller of the implantable medical device; and
(iii) wherein the controller is configured to determine if a patient is hypoglycemic or hyperglycemic based on the signals from the heart sounds sensor, wherein the controller is configured to detect the amplitude of an S2 heart sound from the signals from the heart sounds sensor, determine the time interval between an S1 heart sound and the time of the maximum amplitude of the S2 heart sound (S2max), determine the time interval between the S1 heart sound and an end of the S2 heart sound (S2end),where the controller stores baseline data derived from a signal from the heart sounds sensor and then compares signals later received from the heart sounds sensor to the baseline data to determine if a patient is hypoglycemic or hyperglycemic; and
wherein the controller determines that the patient is hypoglycemic if the amplitude of the S2 heart sound deviates by a predetermined threshold from a baseline, and if both the time interval from S1 to S2max and from S1 to S2end lengthens relative to the baseline by a predetermined threshold.
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Accused Products
Abstract
An apparatus for monitoring a patient'"'"'s blood glucose level. The apparatus includes an implantable medical device having a controller and an implantable heart sounds sensor configured to transmit signals to the controller of the implantable medical device. The controller is configured to determine if a patient is hypoglycemic or hyperglycemic based on the signals from the heart sounds sensor. A method is also disclosed that includes sensing the patient'"'"'s heart sounds, determining the amplitude of the S2 heart sound, determining the length of the interval from the S1 heart sound to the S2max heart sound, determining the length of the interval from the S1 heart sound to the S2end heart sound, and determining the patient'"'"'s blood glucose status based on the patient'"'"'s heart sounds.
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Citations
20 Claims
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1. An apparatus for monitoring a patient'"'"'s blood glucose level, the apparatus comprising:
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(i) an implantable medical device having a controller; (ii) an implantable heart sounds sensor configured to transmit signals to the controller of the implantable medical device; and (iii) wherein the controller is configured to determine if a patient is hypoglycemic or hyperglycemic based on the signals from the heart sounds sensor, wherein the controller is configured to detect the amplitude of an S2 heart sound from the signals from the heart sounds sensor, determine the time interval between an S1 heart sound and the time of the maximum amplitude of the S2 heart sound (S2max), determine the time interval between the S1 heart sound and an end of the S2 heart sound (S2end), where the controller stores baseline data derived from a signal from the heart sounds sensor and then compares signals later received from the heart sounds sensor to the baseline data to determine if a patient is hypoglycemic or hyperglycemic; and wherein the controller determines that the patient is hypoglycemic if the amplitude of the S2 heart sound deviates by a predetermined threshold from a baseline, and if both the time interval from S1 to S2max and from S1 to S2end lengthens relative to the baseline by a predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for monitoring a patient'"'"'s blood glucose level, the apparatus comprising:
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(i) an implantable medical device having a controller; (ii) an implantable heart sounds sensor configured to transmit signals to the controller of the implantable medical device; and (iii) wherein the controller is configured to determine if a patient is hypoglycemic or hyperglycemic based on the signals from the heart sounds sensor, wherein the controller is configured to detect the amplitude of an S2 heart sound from the signals from the heart sounds sensor, determine the time interval between an S1 heart sound and the time of the maximum amplitude of the S2 heart sound (S2max), determine the time interval between the S1 heart sound and an end of the S2 heart sound (S2end), where the controller stores baseline data derived from a signal from the heart sounds sensor and then compares signals later received from the heart sounds sensor to the baseline data to determine if a patient is hypoglycemic or hyperglycemic; and where the controller determines that the patient is hyperglycemic if the amplitude of the S2 heart sound deviates by a predetermined threshold from baseline, and if both the time interval from S1 to S2max and from S1 to S2end do not change by more than a predetermined threshold from the baseline. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification