Patent ID: 11938072
Assignee: HILL-ROM SERVICES, INC.
Field: Medical technology (Instruments)
Classification: CPC A  G  H | IPC A  G  H

Claim 0:
1. A patient support apparatus comprising
a patient support frame,
a patient support surface supported on the patient support frame, and
a RADAR system carried by the patient support frame and operable to determine a depth to which a patient is immersed into the mattress and to perform a Doppler analysis to determine at least one of a heart rate or a respiration rate of the patient, wherein the RADAR system comprises a local oscillator, a power splitter having an input coupled to the local oscillator, at least one transmitting antenna coupled to a first output of the power splitter, a mixer having a first input coupled to a second output of the power splitter, at least one receiving antenna coupled to a second input of the mixer, a first low pass filter having an input coupled to a quadrature output of the mixer, a second low pass filter having an input coupled to an in-phase output of the mixer, a first analog-to-digital converter coupled to an output of the first low pass filter, and a second analog-to-digital converter coupled to an output of the second low pass filter.