US 12,226,566 B2
Dual mode negative pressure source operation for provision of negative pressure wound therapy
Ben Alan Askem, Leeds (GB); and David Michael Elder, Hull (GB)
Assigned to T.J.Smith and Nephew, Limited, Hull (GB)
Appl. No. 17/919,700
Filed by T.J.Smith and Nephew, Limited, Hull (GB)
PCT Filed Apr. 23, 2021, PCT No. PCT/EP2021/060655
§ 371(c)(1), (2) Date Oct. 18, 2022,
PCT Pub. No. WO2021/214286, PCT Pub. Date Oct. 28, 2021.
Claims priority of application No. 2005928 (GB), filed on Apr. 23, 2020.
Prior Publication US 2023/0145353 A1, May 11, 2023
Int. Cl. A61M 1/00 (2006.01)
CPC A61M 1/966 (2021.05) [A61M 1/75 (2021.05); A61M 2205/3344 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A negative pressure wound therapy device comprising:
a source of negative pressure configured to be connected via a fluid flow path to a wound covered by a wound dressing, the source of negative pressure configured to supply negative pressure to the wound via the fluid flow path;
a pressure sensor configured to measure pressure in the fluid flow path; and
a controller configured to control the source of negative pressure, the controller further configured to:
determine a pressure difference between a negative pressure setpoint corresponding to desired negative pressure at the wound and pressure measured by the pressure sensor;
in response to determining that the pressure difference does not satisfy a stall threshold of a motor of the source of negative pressure, apply to the motor a first drive signal determined based on the pressure difference; and
in response to determining that the pressure difference satisfies the stall threshold of the motor, apply a second drive signal to the motor and cause the motor to be activated for a first period of time and deactivated for a second period of time subsequent to the first period of time.