Medium voltage therapy applications in treating cardiac arrest
First Claim
1. An improved automated external defibrillator (AED), the AED including a set of electrodes that are adapted to interface with an exterior surface of a patient, defibrillation circuitry that is adapted to generate and deliver a defibrillation shock to the patient via the set of electrodes, patient monitoring circuitry that is adapted to sense a patient condition based on cardiac activity of the patient, and at least one controller interfaced with the patient monitoring circuitry and the defibrillation circuitry, the at least one controller including logic configured to determine if the patient condition is treatable by administration of the defibrillation shock and, if so, to control generation and delivery of the defibrillation shock, the improvement comprising:
- additional logic in the at least one controller configured to recognize whether the patient condition is treatable by cardio-pulmonary resuscitation (CPR); and
electrical CPR circuitry interfaced with the at least one controller, and adapted to generate and deliver medium voltage therapy (MVT) via the set of electrodes in response to a recognition, by the at least one controller, that the patient condition t-hat-is treatable by CPR, the MVT being continuous for a duration on the order of minutes, and having amplitude and waveform characteristics to (a) electrically force mechanical pumping action of the patient'"'"'s heart via electrical stimulation of cardiac muscle cells, and (b) mechanically force pumping action of the patient'"'"'s heart via electrical stimulation of non-cardiac muscle cells resulting in compression of the heart, during that duration;
wherein the electrical CPR circuitry is adapted to produce the MVT having amplitude and waveform characteristics such that, in the electrically forced mechanical pumping action in (a), diastolic cardiac muscle cells are forced to contract during each of a plurality of intervals and systolic cardiac muscle cells are prevented from relaxing during those intervals, and between successive ones of the plurality of intervals the cardiac muscle cells are not forced.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and system for treating an individual experiencing cardiac arrest using an automatic external defibrillator (AED) includes placing a first and a second electrode of the AED in electrical communication with an exterior surface of the individual. A need to apply a high voltage defibrillation signal to the individual is automatically determined. The method also includes automatically causing the AED to apply a medium voltage therapy (MVT) signal through the first and the second electrodes to the individual. The MVT signal is applied to induce a hemodynamic effect in the individual. Alternatively, or additionally, the MVT signal is applied to induce a respiratory effect in the individual. Optionally, the MVT signal is applied before determining the need to apply the defibrillation signal.
-
Citations
23 Claims
-
1. An improved automated external defibrillator (AED), the AED including a set of electrodes that are adapted to interface with an exterior surface of a patient, defibrillation circuitry that is adapted to generate and deliver a defibrillation shock to the patient via the set of electrodes, patient monitoring circuitry that is adapted to sense a patient condition based on cardiac activity of the patient, and at least one controller interfaced with the patient monitoring circuitry and the defibrillation circuitry, the at least one controller including logic configured to determine if the patient condition is treatable by administration of the defibrillation shock and, if so, to control generation and delivery of the defibrillation shock, the improvement comprising:
-
additional logic in the at least one controller configured to recognize whether the patient condition is treatable by cardio-pulmonary resuscitation (CPR); and electrical CPR circuitry interfaced with the at least one controller, and adapted to generate and deliver medium voltage therapy (MVT) via the set of electrodes in response to a recognition, by the at least one controller, that the patient condition t-hat-is treatable by CPR, the MVT being continuous for a duration on the order of minutes, and having amplitude and waveform characteristics to (a) electrically force mechanical pumping action of the patient'"'"'s heart via electrical stimulation of cardiac muscle cells, and (b) mechanically force pumping action of the patient'"'"'s heart via electrical stimulation of non-cardiac muscle cells resulting in compression of the heart, during that duration; wherein the electrical CPR circuitry is adapted to produce the MVT having amplitude and waveform characteristics such that, in the electrically forced mechanical pumping action in (a), diastolic cardiac muscle cells are forced to contract during each of a plurality of intervals and systolic cardiac muscle cells are prevented from relaxing during those intervals, and between successive ones of the plurality of intervals the cardiac muscle cells are not forced. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. A hand-portable automated external defibrillator (AED) system comprising:
-
a set of electrodes that are adapted to interface with an exterior surface of a patient; a patient monitoring sub-system that is operatively coupled to the set of electrodes and adapted to sense a patient condition based at least partly on cardiac activity of the patient; defibrillation circuitry that is operatively coupled to the set of electrodes and adapted to generate and deliver a defibrillation shock to the patient via the set of electrodes in response to the patient condition sensed by the patient monitoring sub-system that is determined to be treatable by defibrillation; electrical CPR circuitry that is operatively coupled to the set of electrodes and adapted to generate and deliver medium voltage therapy (MVT), via the same set of electrodes as those used for delivery of the defibrillation shock, in response to a patient condition sensed by the patient monitoring sub-system that is determined to be treatable by CPR; at least one controller interfaced with the patient monitoring sub-system, the defibrillation circuitry and the electrical CPR circuitry, the at least one controller being configured to; determine whether the patient condition sensed by the patient monitoring sub-system is treatable by either or both of the defibrillation or the CPR; control generation and delivery of the defibrillation shock in response to a determination of the patient condition being treatable by defibrillation, and control generation and delivery of the MVT in response to a determination of the patient condition being treatable by CPR; wherein the electrical CPR circuitry is configured to produce the MVT that is continuous for a duration on the order of minutes, and sufficient to cause both a hemodynamic effect and a respiratory effect in the patient during that duration, wherein the hemodynamic effect is achieved via; targeted stimulation of cardiac muscle cells to electrically stimulate relaxed cells to contract and to electrically stimulate contracted cells to extend their contraction duration, and targeted stimulation of non-cardiac chest muscle cells to electrically force chest compressions causing a mechanical pumping effect of the heart; and wherein the respiratory effect is achieved via the targeted stimulation of the non-cardiac muscle cells to force some amount of ventilation; wherein the electrical CPR circuitry is adapted to produce an MVT waveform targeting stimulation of the cardiac muscle cells having a pulsed packet output with intra-packet pulse widths of between 2 ms and 10 ms; and wherein the electrical CPR circuitry is adapted to produce an MVT waveform targeting stimulation of the non-cardiac muscle cells having a pulsed packet output with intra-packet pulse widths of between 0.05 ms and 0.2 ms; and wherein the electrical CPR circuitry is adapted to deliver the MVT having a pulsed output voltage of 75-1000 V, a pulsed output current of between 0.05-10.00 A, a pulsed packet rate of between 20-180 packets/minute, a pulsed packet duration of between 10-3000 ms, and an intra-packet pulse rate of between 20-500 Hz. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
-
Specification