Bed-based ballistocardiogram apparatus and method
AssigneesHill-Rom Services, Inc., Georgia Tech Research Corporation
InventorsHewon Jung, Jacob P. Kimball, Omer T. Inan, Timothy J. Receveur, Eric D. Agdeppa
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Abstract
A bed-based ballistocardiogram (BCG) enables non-invasive cardiovascular monitoring of a patient on a patient bed. A method for bed-based BCG recordings includes (1) creating templates for standing BCG signals obtained from subjects in a prior study, and (2) quantifying the distance between these templates and BCG waveforms obtained in different body positions on the patient bed for a new set of subjects. The different body positions on the patient bed include supine, left lying, right lying, prone, and seated.
Claims19
A patient bed comprising:
- a frame configured to support a patient,
- a weigh scale coupled to the frame and configured to weigh a patient supported by the frame of the patient bed, the weigh scale having four load cells that produce signals from which a patient weight is determined,
- a ballistocardiogram carried by the frame, wherein the ballistocardiogram includes ballistocardiogram circuitry in electrical communication with only two of the four load cells of the weigh scale, wherein signals from the only two of the four load cells being processed by the ballistocardiogram circuitry to determine a heart rate of the patient, wherein a low pass filtered signal from at least one of the four load cells is processed by the ballistocardiogram circuitry to determine a tidal volume of the patient, and
- a graphical user interface (GUI) carried by the frame and coupled electrically to the ballistocardiogram circuitry, the GUI being usable to provide inputs to a pneumatic system that controls inflation of bladders of a mattress of the patient bed, wherein the bladders overlie the four load cells, the GUI also being operable to display an input to capture supine waveforms to be used in determining a reference template for the ballistocardiogram while the patient is lying supine on the mattress.
A patient bed comprising:
- a frame configured to support a patient,
- a weigh scale coupled to the frame and configured to weigh a patient supported by the frame of the patient bed, the weigh scale having a plurality of load cells that produce signals from which a patient weight is determined,
- a ballistocardiogram carried by the frame, wherein the ballistocardiogram includes ballistocardiogram circuitry in electrical communication with the plurality of load cells, wherein the signals from at least some, but not all, of the plurality of load cells being processed by the ballistocardiogram circuitry to determine a heart rate of the patient by comparing signals from the at least some, but not all, of the plurality of load cells to at least one template waveform generated previously during a ballistocardiogram test of a test subject in a test position on the patient bed, wherein a low pass filtered signal from at least one load cell of the plurality of load cells is processed by the ballistocardiogram circuitry to determine a tidal volume of the patient, and
- a graphical user interface (GUI) carried by the frame and coupled electrically to the ballistocardiogram circuitry, the GUI being usable to provide inputs to a pneumatic system that controls inflation of bladders of a mattress of the patient bed, wherein the bladders overlie the plurality of load cells, the GUI also being operable to display an input to capture supine waveforms to be used as the at least one template waveform while the patient is lying supine on the mattress.
Dependencies are inferred from the claim text.