MONITORING OF CARDIAC ARREST IN A PATIENT CONNECTED TO AN EXTRACORPOREAL BLOOD PROCESSING APPARATUS
First Claim
1. :
- A monitoring device, comprising;
an input block configured to obtain a first pressure signal from a first pressure sensor arranged in an extracorporeal blood processing apparatus to detect pressure variations in a fluid which is pumped through a blood processing unit in the extracorporeal blood processing apparatus, wherein the extracorporeal blood processing apparatus is connected to a vascular system of a subject and includes at least one blood pumping device operable to pump blood from the vascular system through the blood processing unit and back to the vascular system;
a processing block configured to repeatedly process the first pressure signal for generation of a time-sequence of parameter values indicative of pressure pulsations originating from heartbeats in the subject; and
an evaluation block configured to (i) evaluate the parameter values according to a detection criterion for cardiac arrest, which is set to detect a disappearance of the pressure pulsations originating from the heartbeats in the first pressure signal, and, (ii) if the detection criterion is fulfilled, generate an alarm signal that signals a cardiac arrest in the subject.
1 Assignment
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Accused Products
Abstract
A monitoring device (7) operates an input block (30) to acquire a pressure signal from a pressure sensor (6a-6c) in an apparatus for extracorporeal blood processing connected to the vascular system of the subject. A processing block (34) repeatedly processes the pressure signal for generation of a time-sequence of parameter values indicative of pressure pulsations originating from heartbeats in the subject, and an evaluation block (35) evaluates the parameter values for detection of cardiac arrest and, if cardiac arrest is detected, generates a dedicated alarm signal. To reduce the risk for false positives without increasing the risk for false negatives, the monitoring device (7) may acquire and process more than one pressure signal, and/or perform an initial viability check before the monitoring is initiated to ensure that pressure pulsations originating from heartbeats are detectable in the pressure signal(s), and/or separate the monitoring of the pressure signal(s) into a detection phase performed during regular operation of a blood pump in the apparatus, and a verification phase performed during a temporary shutdown of the blood pump.
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Citations
49 Claims
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1. :
- A monitoring device, comprising;
an input block configured to obtain a first pressure signal from a first pressure sensor arranged in an extracorporeal blood processing apparatus to detect pressure variations in a fluid which is pumped through a blood processing unit in the extracorporeal blood processing apparatus, wherein the extracorporeal blood processing apparatus is connected to a vascular system of a subject and includes at least one blood pumping device operable to pump blood from the vascular system through the blood processing unit and back to the vascular system; a processing block configured to repeatedly process the first pressure signal for generation of a time-sequence of parameter values indicative of pressure pulsations originating from heartbeats in the subject; and an evaluation block configured to (i) evaluate the parameter values according to a detection criterion for cardiac arrest, which is set to detect a disappearance of the pressure pulsations originating from the heartbeats in the first pressure signal, and, (ii) if the detection criterion is fulfilled, generate an alarm signal that signals a cardiac arrest in the subject. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
- A monitoring device, comprising;
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22. :
- A monitoring device, comprising;
means for obtaining a first pressure signal from a first pressure sensor arranged in an extracorporeal blood processing apparatus to detect pressure variations in a fluid which is pumped through a blood processing unit in the extracorporeal blood processing apparatus, wherein the extracorporeal blood processing apparatus is connected to a vascular system of a subject and includes at least one blood pumping device operable to pump blood from the vascular system through the blood processing unit and back to the vascular system; means for repeatedly processing the first pressure signal for generation of a time-sequence of parameter values indicative of pressure pulsations originating from heartbeats in the subject; means for evaluating the parameter values according to a detection criterion for cardiac arrest, which is set to detect a disappearance of the pressure pulsations originating from the heartbeats in the first pressure signal; and means for generating, if the detection criterion is fulfilled, an alarm signal that signal a cardiac arrest in the subject.
- A monitoring device, comprising;
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23. :
- A monitoring device, comprising;
an input block configured to obtain a first pressure signal from a first pressure sensor arranged in an extracorporeal blood processing apparatus to detect pressure variations in a fluid which is pumped through a blood processing unit in the extracorporeal blood processing apparatus, wherein the extracorporeal blood processing apparatus is connected to a vascular system of a subject and includes at least one blood pumping device operable to pump blood from the vascular system through the blood processing unit and back to the vascular system; and a signal processor configured to (i) repeatedly process the first pressure signal for generation of a time-sequence of parameter values indicative of pressure pulsations originating from heartbeats in the subject, (ii) evaluate the parameter values according to a detection criterion for cardiac arrest, which is set to detect a disappearance of the pressure pulsations originating from the heartbeats in the first pressure signal, and (iii) generate, if the detection criterion is fulfilled, an alarm signal that signals a cardiac arrest in the subject. - View Dependent Claims (24, 25, 26, 27, 28)
- A monitoring device, comprising;
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29. :
- A monitoring method, comprising;
obtaining a first pressure signal from a first pressure sensor, arranged in an extracorporeal blood processing apparatus to detect pressure variations in a fluid which is pumped through a blood processing unit in the extracorporeal blood processing apparatus, wherein the extracorporeal blood processing apparatus is connected to a vascular system of a subject and includes at least one blood pumping device operable to pump blood from the vascular system through the blood processing unit and back to the vascular system; processing the first pressure signal for generation of a time-sequence of parameter values indicative of pressure pulsations originating from heartbeats in the subject; evaluating the parameter values according to a detection criterion for cardiac arrest, which is set to detect a disappearance of the pressure pulsations originating from the heartbeats in the first pressure signal; and generating, if the detection criterion is fulfilled, an alarm signal that signals a cardiac arrest in the subject. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
- A monitoring method, comprising;
Specification