Patent ID: 8911378

Claim:
A method for determining cuff slippage in a blood pressure monitoring device, the method comprising: on the blood pressure monitoring device, starting a cuff inflation including inflating a blood pressure cuff; obtaining a plurality of pressure samples when the blood pressure cuff is inflating; determining, by a processing device, whether a slope corresponding to the plurality of pressure samples is a positive number; when it is determined that the slope is a positive number, determining the processing device, a level of background noise during the blood pressure cuff inflation, the level of background noise being determined from the plurality of pressure samples; and when the background noise is determined, determining, by the processing device, from the plurality of pressure samples whether a pressure pattern indicating cuff slippage is obtained; wherein determining from the plurality of pressure samples whether a pressure sample pattern indicating cuff slippage is obtained comprises: obtaining the last pressure sample in the plurality of pressure samples; obtaining the first from last pressure sample in the plurality of pressure samples; obtaining the second from last pressure sample in the plurality of pressure samples; obtaining the third from last pressure sample in the plurality of pressure samples; determining whether the third from last pressure sample is greater than the sum of the second from the last pressure sample and the product of 1.5 multiplied by the level of background noise; determining whether the last pressure sample is greater than the sum of the first from last pressure sample and the product of 1.5 multiplied by the level of background noise; and when it is determined that the third from last pressure sample is greater than the sum of the second from last pressure sample and the product of 1.5 multiplied by the level of background noise and when it is determined that the last pressure sample is greater than the sum of the first from last pressure sample and the product of 1.5 multiplied by the level of background noise, making a determination that a cuff slippage condition exists.