Bed load cell based physiological sensing systems and methods
First Claim
Patent Images
1. A system comprising:
- a person support apparatus embodied as a hospital bed comprising a lower frame supported on wheels, a weigh frame supported by supports for variable elevation relative to the lower frame, at least one deck section supported on the weigh frame, and a set of siderails movable with respect to the weigh frame and the at least one deck section between raised and lowered positions;
at least two force transducers configured to mount on said person support apparatus, said at least two force transducers configured to generate signals indicative of forces acting on said at least two force transducers by a person supported on the hospital bed; and
a controller carried by the hospital bed and comprising a processor configured to receive signals from said at least two force transducers, said controller configured to process the signals received from said at least two force transducers to determine the person'"'"'s weight and to determine blood volume pulse based only on the signals from said at least two force transducers by causing the signals to undergo blind source separation analysis including an independent component analysis (ICA) transform to identify source signals indicative of forces produced by the person onto the hospital bed, the source signals being indicative of varying flow through the person'"'"'s blood vessels during the person'"'"'s cardiac cycle, wherein after the ICA transform the controller performs artifact suppression on the source signals, wherein the controller is also operable to control movement of the at least one deck section and weigh frame relative to the lower frame, wherein each force transducer of the at least two force transducers detects a mixture of the blood volume pulse and the person'"'"'s weight, wherein weight detected by the at least two force transducers is used by the controller to determine if the person is supported on the hospital bed and, if it is determined by the controller that the person is not supported on the hospital bed, the operation to determine blood volume pulse is terminated and a message displayed on a touch screen display of the hospital bed.
6 Assignments
0 Petitions
Accused Products
Abstract
A system for determining a physiological signal of a person supported by a person support apparatus using signals from force transducers is described herein. Force transducers communicate with a controller to transmit signals indicative of weight acting on them. The controller determines blood volume pulse information from the signals received from the force transducers. Heart rate and respiratory rate information is derived from the blood volume pulse information.
296 Citations
26 Claims
-
1. A system comprising:
-
a person support apparatus embodied as a hospital bed comprising a lower frame supported on wheels, a weigh frame supported by supports for variable elevation relative to the lower frame, at least one deck section supported on the weigh frame, and a set of siderails movable with respect to the weigh frame and the at least one deck section between raised and lowered positions; at least two force transducers configured to mount on said person support apparatus, said at least two force transducers configured to generate signals indicative of forces acting on said at least two force transducers by a person supported on the hospital bed; and a controller carried by the hospital bed and comprising a processor configured to receive signals from said at least two force transducers, said controller configured to process the signals received from said at least two force transducers to determine the person'"'"'s weight and to determine blood volume pulse based only on the signals from said at least two force transducers by causing the signals to undergo blind source separation analysis including an independent component analysis (ICA) transform to identify source signals indicative of forces produced by the person onto the hospital bed, the source signals being indicative of varying flow through the person'"'"'s blood vessels during the person'"'"'s cardiac cycle, wherein after the ICA transform the controller performs artifact suppression on the source signals, wherein the controller is also operable to control movement of the at least one deck section and weigh frame relative to the lower frame, wherein each force transducer of the at least two force transducers detects a mixture of the blood volume pulse and the person'"'"'s weight, wherein weight detected by the at least two force transducers is used by the controller to determine if the person is supported on the hospital bed and, if it is determined by the controller that the person is not supported on the hospital bed, the operation to determine blood volume pulse is terminated and a message displayed on a touch screen display of the hospital bed. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A person support apparatus embodied as a hospital bed comprising:
-
a lower frame supported on wheels; a weigh frame supported by supports for variable elevation relative to the lower frame; at least one deck section supported on the weigh frame; a set of siderails movable with respect to the weigh frame and the at least one deck section between raised and lowered positions; a mattress supported by the at least one deck section and configured to support a person; at least two force transducers configured to generate signals indicative of components of weight of a person supported by said mattress acting on said at least two force transducers; and a controller carried by the hospital bed and comprising a processor configured to receive signals from said at least two force transducers, said controller configured to process the signals received from said at least two force transducers to determine the person'"'"'s weight and to determine blood volume pulse based only on the signals from said at least two force transducers by causing the signals to undergo blind source separation analysis including an independent component analysis (ICA) transform to identify source signals indicative of forces produced by the person onto the hospital bed, the source signals being indicative of varying flow through the person'"'"'s blood vessels during the person'"'"'s cardiac cycle, wherein after the ICA transform the controller performs artifact suppression on the source signals, wherein the controller is also operable to control movement of the at least one deck section and weigh frame relative to the lower frame, wherein each force transducer of the at least two force transducers detects a mixture of the blood volume pulse and the person'"'"'s weight, wherein weight detected by the at least two force transducers is used by the controller to determine if the person is supported on the hospital bed and, if it is determined by the controller that the person is not supported on the hospital bed, the operation to determine blood volume pulse is terminated and a message displayed on a touch screen display of the hospital bed. - View Dependent Claims (9, 10, 11, 12)
-
-
13. A physiological signal sensing system for use with a person support apparatus embodied as a hospital bed comprising a lower frame supported on wheels, a weigh frame supported by supports for variable elevation relative to the lower frame, at least one deck section supported on the weigh frame, and a set of siderails movable with respect to the weigh frame and the at least one deck section between raised and lowered positions, the system comprising:
-
at least two force transducers configured to generate signals in response to a person'"'"'s weight supported by said at least two force transducers; and a controller carried by the hospital bed and comprising a processor configured to receive signals from said at least two force transducers, said controller configured to process the signals received from said at least two force transducers to determine the person'"'"'s weight to determine blood volume pulse based only on the signals from said at least two force transducers by causing the signals to undergo blind source separation analysis including an independent component analysis (ICA) transform to identify source signals indicative of forces produced by the person onto the hospital bed, the source signals being indicative of varying flow through the person'"'"'s blood vessels during the person'"'"'s cardiac cycle, wherein after the ICA transform the controller performs artifact suppression on the source signals, wherein the controller is also operable to control movement of the at least one deck section and weigh frame relative to the lower frame, wherein each force transducer of the at least two force transducers detects a mixture of the blood volume pulse and the person'"'"'s weight, wherein weight detected by the at least two force transducers is used by the controller to determine if the person is supported on the hospital bed and, if it is determined by the controller that the person is not supported on the hospital bed, the operation to determine blood volume pulse is terminated and a message displayed on a touch screen display of the hospital bed. - View Dependent Claims (14, 15, 16, 17)
-
-
18. A system comprising:
-
a person support apparatus embodied as a hospital bed comprising a lower frame supported on wheels, a weigh frame supported by supports for variable elevation relative to the lower frame, at least one deck section supported on the weigh frame, and a set of siderails movable with respect to the weigh frame and the at least one deck section between raised and lowered positions; means to generate signals indicative of components of weight acting said person support apparatus by a person; and means carried by the hospital bed to determine blood volume pulse from said signals indicative of components of weight acting on said person support apparatus based only on the signals from said means to generate signals by causing the signals to undergo blind source separation analysis including an independent component analysis (ICA) transform to identify source signals indicative of forces produced by the person onto the hospital bed, the source signals being indicative of varying flow through the person'"'"'s blood vessels during the person'"'"'s cardiac cycle, wherein the controller is also operable to control movement of the at least one deck section and weigh frame relative to the lower frame, wherein after the ICA transform the means to determine blood volume pulse performs artifact suppression on the source signals, wherein the means to generate signals detects a mixture of the blood volume pulse and the person'"'"'s weight, wherein weight detected by the means to generate signals is used by the means to determine blood volume pulse to determine if the person is supported on the hospital bed and, if it is determined by the means to determine blood volume pulse that the person is not supported on the hospital bed, the operation to determine blood volume pulse is terminated and a message displayed on a touch screen display of the hospital bed. - View Dependent Claims (19, 20)
-
-
21. A method of sensing a physiological signal of a person supported by a person support apparatus embodied as a hospital bed comprising a lower frame supported on wheels, a weigh frame supported by supports for variable elevation relative to the lower frame, at least one deck section supported on the weigh frame, and a set of siderails movable with respect to the weigh frame and the at least one deck section between raised and lowered positions, the method comprising:
-
generating signals indicative of components of forces acting on said person support apparatus by a person using at least two force transducers; transmitting said signals to a controller carried by the hospital bed; and with the controller, processing signals indicative of components of forces acting on said person support apparatus to determine blood volume pulse based only on the signals from said at least two force transducers by causing the signals to undergo blind source separation analysis including an independent component analysis (ICA) transform to identify source signals indicative of forces produced by the person onto the hospital bed, the source signals being indicative of varying flow through the person'"'"'s blood vessels during the person'"'"'s cardiac cycle, wherein after the ICA transform the controller performs artifact suppression on the source signals, wherein the controller is also operable to control movement of the at least one deck section and weigh frame relative to the lower frame, wherein each force transducer of the at least two force transducers detects a mixture of the blood volume pulse and the person'"'"'s weight, wherein weight detected by the at least two force transducers is used by the controller to determine if the person is supported on the hospital bed and, if it is determined by the controller that the person is not supported on the hospital bed, the operation to determine blood volume pulse is terminated and a message displayed on a touch screen display of the hospital bed. - View Dependent Claims (22, 23, 24, 25, 26)
-
Specification