US 12,268,577 B2
Optimizing power transfer to negative pressure sources in negative pressure therapy systems
Ben Alan Askem, Leeds (GB); Victoria Beadle, Hull (GB); John Philip Gowans, Hessle (GB); Mark Hesketh, Royston (GB); Allan Kenneth Frazer Grugeon Hunt, Beverley (GB); William Kelbie, Inverness (GB); Damyn Musgrave, Cottenham (GB); and Joseph William Robinson, Papworth Everard (GB)
Assigned to Smith & Nephew PLC, Watford (GB)
Filed by Smith & Nephew PLC, Watford (GB)
Filed on Nov. 15, 2021, as Appl. No. 17/526,992.
Application 17/526,992 is a continuation of application No. 16/098,563, granted, now 11,173,240, previously published as PCT/EP2017/060452, filed on May 3, 2017.
Claims priority of provisional application 62/479,588, filed on Mar. 31, 2017.
Claims priority of provisional application 62/331,098, filed on May 3, 2016.
Prior Publication US 2022/0133978 A1, May 5, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. A61F 13/05 (2024.01); A61M 1/00 (2006.01)
CPC A61F 13/05 (2024.01) [A61M 1/74 (2021.05); A61M 1/962 (2021.05); A61M 1/966 (2021.05); A61M 2205/0294 (2013.01); A61M 2205/3327 (2013.01); A61M 2205/3344 (2013.01); A61M 2205/502 (2013.01); A61M 2205/52 (2013.01); A61M 2205/587 (2013.01); A61M 2205/8212 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus for applying negative pressure to a wound, the apparatus comprising:
a source of negative pressure configured to provide negative pressure via a fluid flow path to a wound;
a driving circuitry configured to:
generate a driving signal comprising a varying electrical voltage or a varying electrical current, and
provide the driving signal to the source of negative pressure to cause the source of negative pressure to provide negative pressure; and
a controller programmed to, while the source of negative pressure is providing negative pressure:
determine a magnitude of the driving signal at a first time and a magnitude of the driving signal at a second time subsequent to the first time, and
vary a frequency at which the driving signal is generated by the driving circuitry responsive to a comparison of the magnitude of the driving signal at the first time to the magnitude of the driving signal at the second time.