Alerting users of CPR feedback device of detected magnetic interference
First Claim
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1. A medical device for communicating to a user information associated with cardiopulmonary resuscitation (CPR) chest compressions performed on a patient in a supine position, the medical device comprising:
- a first sensor configured to be positioned beneath a chest of the patient;
a second sensor configured to be positioned on the chest of the patient;
a detector configured to utilize information from the first sensor and the second sensor to detect magnetic fields associated with the CPR chest compressions;
a processor configured to estimate net depths of the CPR chest compressions between the first sensor and the second sensor from the detected magnetic fields;
an interface configured to communicate the estimated depths to the user;
a sensing functionality configured to utilize information from the first sensor and the second sensor to sense whether, in a vicinity of the detector, there is interference, not associated with the CPR chest compressions, that is superimposed on the detected magnetic fields associated with the CPR chest compressions, wherein the first sensor and the second sensor collectively include a coil and the sensing functionality is further configured to energize the coil, to monitor impedance of the coil, and to detect a shift within the monitored impedance of the coil in response to the energizing; and
a module configured to cause the device to enter an alert mode in response to an amount of the sensed interference being above a threshold.
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Abstract
A medical device and/or a method are used by a rescuer who is caring for a patient. The depth of CPR chest compressions is determined, by detecting magnetic fields. An interference is sensed, which is not associated with the CPR chest compressions, but which is superimposed on the detected magnetic fields. Appropriate countermeasures may be taken, if the sensed interference is larger than a threshold.
14 Citations
24 Claims
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1. A medical device for communicating to a user information associated with cardiopulmonary resuscitation (CPR) chest compressions performed on a patient in a supine position, the medical device comprising:
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a first sensor configured to be positioned beneath a chest of the patient; a second sensor configured to be positioned on the chest of the patient; a detector configured to utilize information from the first sensor and the second sensor to detect magnetic fields associated with the CPR chest compressions; a processor configured to estimate net depths of the CPR chest compressions between the first sensor and the second sensor from the detected magnetic fields; an interface configured to communicate the estimated depths to the user; a sensing functionality configured to utilize information from the first sensor and the second sensor to sense whether, in a vicinity of the detector, there is interference, not associated with the CPR chest compressions, that is superimposed on the detected magnetic fields associated with the CPR chest compressions, wherein the first sensor and the second sensor collectively include a coil and the sensing functionality is further configured to energize the coil, to monitor impedance of the coil, and to detect a shift within the monitored impedance of the coil in response to the energizing; and a module configured to cause the device to enter an alert mode in response to an amount of the sensed interference being above a threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for a medical device having a detector configured to detect magnetic fields associated with the magnetic fields associated with CPR chest compression chest compressions and a processor configured to estimate depths of the CPR chest compressions from the detected magnetic fields, the method comprising:
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detecting, with the detector, magnetic fields associated with the CPR chest compressions, the detector comprising a first sensor and a second sensor, the first sensor being within a bottom device configured to be placed under a chest of a patient in a supine position on a yieldable surface, the second sensor being configured to be positioned on the chest of the patient; estimating net depths of the CPR chest compressions between the first sensor and the second sensor from the detected magnetic fields, excluding yield associated with the yieldable surface under the patient; sensing whether, in a vicinity of the detector, there is interference, not associated with the CPR chest compressions, that is superimposed on the detected magnetic fields associated with the CPR chest compressions, further comprising; energizing a coil being collectively included in the first sensor and the second sensor; monitoring impedance of the coil; and detecting a shift within the impedance of the coil in response to the energizing; determining whether an amount of the sensed interference is above a threshold; and when the amount of the sensed interference is above the threshold, causing the device to enter an alert mode. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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Specification