US 11,892,376 B2
System for pressure monitoring and processing leakage determination of a bladder
Justin Raymond, Portage, MI (US); Darcy Richard Wank, Richland, MI (US); Michael John Olson, Kalamazoo, MI (US); and Anuj K. Sidhu, Kalamazoo, MI (US)
Assigned to Stryker Corporation, Kalamazoo, MI (US)
Filed by Stryker Corporation, Kalamazoo, MI (US)
Filed on Apr. 19, 2019, as Appl. No. 16/389,165.
Application 16/389,165 is a continuation of application No. 15/196,100, filed on Jun. 29, 2016, granted, now 10,267,706.
Claims priority of provisional application 62/186,765, filed on Jun. 30, 2015.
Prior Publication US 2019/0242778 A1, Aug. 8, 2019
This patent is subject to a terminal disclaimer.
Int. Cl. G01M 3/32 (2006.01); A47C 27/08 (2006.01)
CPC G01M 3/3272 (2013.01) [A47C 27/082 (2013.01); A47C 27/083 (2013.01); G01M 3/3218 (2013.01)] 14 Claims
OG exemplary drawing
 
9. A patient support comprising:
a mattress having a bladder;
a pneumatic system having a pump for inflating said bladder; and
a leak testing system comprising:
a control system, said control system having one or more memory devices and a sensor, said sensor detecting the pressure in said bladder, and said one or more memory devices comprising a non-transitory computer readable medium comprising stored code, said stored code configured to:
control said pump to pressurize said bladder;
initiate a first test for detecting leakage by directing said pump to pressurize said bladder to a first pressure;
measure, during the first test for detecting leakage, an inflation time to reach the first pressure;
compare the inflation time to a stored acceptable inflation time value, the inflation time corresponding to a first time period and the stored acceptable inflation time value corresponding to a second time period;
after reaching the first pressure of the first test for detecting leakage, initiate a second test for detecting leakage starting from the first pressure of the first test for detecting leakage and including ceasing the pressurization for a third time period greater than zero;
during the second test for detecting leakage, after the third time period, detect a second pressure in said bladder based on one or more signals from said sensor;
during the second test for detecting leakage, at the end of the third time period, measure a fourth time period;
during the second test for detecting leakage, at the end of the fourth time period, sense and measure a third pressure in said bladder, wherein the third pressure represents a reduced pressure from the second pressure;
determine a rate of change from the second pressure to the third pressure in said bladder over the fourth time period;
compare the rate of change to a stored value to determine if there is a leak in the bladder; and
generate a first signal when (1) the inflation time corresponding to the first time period is greater than the stored acceptable inflation time value corresponding to the second time period and a second signal when (2) the rate of change is greater than the stored value indicating a leak in the bladder.