Pulse detection using patient physiological signals
First Claim
1. A method comprising:
- transmitting light into a patient;
receiving light that has been transmitted into the patient;
generating a light detection signal in response to the received light;
processing the light detection signal over a period of time to detect a trend in pulsatile changes in blood volume; and
providing at least one of treatment and information concerning treatment based on the trend in pulsatile changes blood volume.
1 Assignment
0 Petitions
Accused Products
Abstract
The presence of a cardiac pulse in a patient is determined by evaluating physiological signals in the patient. In one embodiment, a medical device evaluates optical characteristics of light transmitted into a patient to ascertain physiological signals, such as pulsatile changes in general blood volume proximate a light detector module. Using these features, the medical device determines whether a cardiac pulse is present in the patient. The medical device may also be configured to report whether the patient is in a VF, VT, asystole, or PEA condition, in addition to being in a pulseless condition, and prompt different therapies, such as chest compressions, rescue breathing, defibrillation, and PEA-specific electrotherapy, depending on the analysis of the physiological signals. Auto-capture of a cardiac pulse using pacing stimuli is further provided.
169 Citations
39 Claims
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1. A method comprising:
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transmitting light into a patient;
receiving light that has been transmitted into the patient;
generating a light detection signal in response to the received light;
processing the light detection signal over a period of time to detect a trend in pulsatile changes in blood volume; and
providing at least one of treatment and information concerning treatment based on the trend in pulsatile changes blood volume. - View Dependent Claims (2, 3, 4)
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5. A method comprising:
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transmitting first light into a patient at a first wavelength;
transmitting second light into a patient at a second wavelength;
receiving the first and second light that has been transmitted into the patient;
generating a light detection signal in response to the received light; and
processing the light detection signal to detect a physiological parameter indicative of a cardiac pulse. - View Dependent Claims (6, 7, 8, 9)
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10. A medical device comprising:
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a light source to transmit light into a patient;
a sensor to receive light that has been transmitted into the patient;
a circuit to generate a light detection signal in response to the received light; and
a processor to process the light detection signal to detect presence of a cardiac pulse, and provide at least one of treatment and information concerning treatment based on the presence of the cardiac pulse. - View Dependent Claims (11, 12, 13)
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14. A medical device comprising:
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a light source to transmit a first light into a patient at a first wavelength and a second light into the patient at a second wavelength;
a sensor to receive the first and second light that has been transmitted into the patient;
a circuit to generate a light detection signal in response to the received light;
a processor to process the light detection signal to detect a physiological parameter indicative of presence of a cardiac pulse, and provide at least one of treatment and information concerning treatment based on physiological parameter. - View Dependent Claims (15, 16, 17, 18)
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19. A method comprising:
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applying a defibrillation electrode with a pulse detector to a first position of a patient;
performing a first pulse detection;
detaching the pulse detector from the defibrillation electrode; and
placing the detached pulse detector at a second position of the patient. - View Dependent Claims (20, 21, 22, 23)
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24. A medical device comprising:
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a defibrillation electrode; and
a pulse detector detachably coupled to the defibrillation electrode. - View Dependent Claims (25, 26, 27, 28)
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29. A medical device comprising:
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a defibrillation electrode; and
a light source for a pulse detector embedded in the defibrillation electrode.
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30. A method comprising:
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transmitting light into a patient at a first intensity;
receiving light transmitted into the patient at the first intensity to generate a first light detection signal;
transmitting light into the patient at a second intensity;
receiving light transmitted into the patient at the second intensity to generate a second light detection signal; and
processing the light detection signals to detect a physiological parameter indicative of presence of a cardiac pulse. - View Dependent Claims (31, 32, 33)
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34. A medical device comprising:
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a light source that transmits light into a patient at a first intensity and a second intensity;
a light detector that receives light transmitted into the patient at the first intensity to generate a first light detection signal, and receives light transmitted into the patient at the second intensity to generate a second light detection signal; and
a processor that processes the light detection signals to detect a physiological parameter indicative of presence of a cardiac pulse. - View Dependent Claims (35, 36, 37)
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38. A method comprising:
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transmitting light into a patient;
receiving light that has been transmitted into the patient;
generating a light detection signal in response to the received light;
processing the light detection signal to detect pulsatile changes in blood volume; and
providing at least one of treatment and information concerning treatment based on the trend in pulsatile changes blood volume. - View Dependent Claims (39)
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Specification