Patent ID: 11857477
Assignee: CERNER INNOVATION, INC.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 8:
9. A system for determining a likelihood of a condition for inducing pressure ulcers comprising:
a measurement device including a multi-layer support surface having:
a contact layer configured for a person to sit or lay thereon comprising a cushion substrate,
a pressure-measuring layer subjacent to the contact layer and configured to measure pressure from the weight of a human patient, and
a substrate layer having a density and stiffness configured to mechanically isolate the pressure-measuring layer from ambient vibrations transmitted through the floor, furniture, or other intervening articles upon which the multi-layer support surface is mounted;

a processor; and
computer memory having computer-usable instructions stored thereon that when executed by the processor perform operations comprising:
acquire a series of pressure measurements from the measurement device, including pressure measurements received during a first time interval,
determine a set of pressure measurement time series including a first time series comprising the pressure measurements received during the first time interval;
determine a multi-taper frequency power spectrum utilizing the first time series,
determine a linear regression for each of two piece-wise linear segments of the power spectrum, each of the regressions having a first-order coefficient,
based on the regressions, determine a frequency cut-point where the two piece-wise linear segments join,
perform a comparison against noise alpha values utilizing the regression coefficients,
based on the comparison, determine a likelihood that the first time period has conditions likely to induce pressure injury, and
initiate an action when the determined likelihood exceeds one or more thresholds corresponding with conditions likely to induce pressure injury, wherein the action comprises generating and emitting a notification of an impending deterioration of the patient's condition via a bedside or patient-side alarm, user/clinician interface, or a smartphone or personal computing device of a caregiver.