US 11,850,348 B2
Control circuit and method for negative pressure wound treatment apparatus
Richard Scott Weston, Encinitas, CA (US); and Tianning Xu, Duluth, GA (US)
Assigned to Smith & Nephew, Inc., Memphis, TN (US)
Filed by Smith & Nephew, Inc., Memphis, TN (US)
Filed on Jun. 19, 2020, as Appl. No. 16/906,997.
Application 13/665,397 is a division of application No. 12/445,043, granted, now 8,308,714, issued on Nov. 13, 2012, previously published as PCT/US2007/021790, filed on Oct. 12, 2007.
Application 16/906,997 is a continuation of application No. 15/495,857, filed on Apr. 24, 2017, granted, now 10,709,826.
Application 15/495,857 is a continuation of application No. 14/179,434, filed on Feb. 12, 2014, granted, now 9,636,440, issued on May 2, 2017.
Application 14/179,434 is a continuation of application No. 13/665,397, filed on Oct. 31, 2012, granted, now 8,663,200, issued on Mar. 4, 2014.
Claims priority of provisional application 60/851,663, filed on Oct. 13, 2006.
Prior Publication US 2020/0384166 A1, Dec. 10, 2020
Int. Cl. A61M 1/00 (2006.01)
CPC A61M 1/74 (2021.05) [A61M 1/71 (2021.05); A61M 1/73 (2021.05); A61M 1/782 (2021.05); A61M 1/96 (2021.05); A61M 1/732 (2021.05); A61M 2205/15 (2013.01); A61M 2205/16 (2013.01); A61M 2205/18 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A negative pressure wound therapy apparatus comprising:
a negative pressure source configured to aspirate fluid from a wound covered by a wound dressing, the negative pressure source comprising a motor;
a pressure sensor configured to measure pressure in a fluid flow path connecting the negative pressure source to the wound dressing; and
a control circuitry configured to:
determine a difference between a negative pressure set point and pressure measured by the pressure sensor;
cause the negative pressure source to operate in a first mode responsive to the difference not satisfying a threshold indicative of stalling of the motor; and
cause the negative pressure source to operate in a second mode responsive to the difference satisfying the threshold indicative of stalling of the motor.