US 12,186,166 B2
Heat-assisted pumping systems for use in negative pressure wound therapy
Allan Kenneth Frazer Grugeon Hunt, Beverley (GB)
Assigned to Smith & Nephew PLC, Watford (GB)
Filed by Smith & Nephew PLC, Watford (GB)
Filed on Jul. 26, 2021, as Appl. No. 17/385,651.
Application 17/385,651 is a continuation of application No. 15/574,793, granted, now 11,071,653, previously published as PCT/EP2016/061147, filed on May 18, 2016.
Claims priority of provisional application 62/163,268, filed on May 18, 2015.
Prior Publication US 2022/0000672 A1, Jan. 6, 2022
Int. Cl. A61F 13/05 (2024.01); A61M 1/00 (2006.01); F01B 3/00 (2006.01); F01B 23/08 (2006.01); F02G 1/043 (2006.01); F03G 3/00 (2006.01); F03G 7/00 (2006.01); F04B 17/00 (2006.01); F04B 45/033 (2006.01); F04B 45/053 (2006.01)
CPC A61F 13/05 (2024.01) [A61M 1/80 (2021.05); A61M 1/962 (2021.05); F01B 3/007 (2013.01); F01B 23/08 (2013.01); F02G 1/0435 (2013.01); F03G 3/00 (2013.01); F03G 7/002 (2013.01); F04B 17/00 (2013.01); F04B 45/033 (2013.01); F04B 45/053 (2013.01); A61M 1/60 (2021.05); A61M 2205/36 (2013.01); A61M 2205/3606 (2013.01); A61M 2205/3613 (2013.01); A61M 2205/362 (2013.01); A61M 2205/3646 (2013.01); A61M 2205/366 (2013.01); A61M 2205/3693 (2013.01); F02G 2243/54 (2013.01); F02G 2270/20 (2013.01); F02G 2280/50 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A negative pressure wound therapy system, comprising:
a wound dressing configured to form a seal over a wound site of a patient; and
a pump system configured to be in fluid communication with the wound dressing, the pump system further comprising:
a housing; and
a negative pressure source;
wherein:
the negative pressure source comprises a plurality of bellows each configured to move from a compressed position to an expanded position;
the negative pressure source further comprises a pump actuator comprising a swash plate in contact with each of the plurality of bellows;
the swash plate is configured to tilt back and forth about only one axis;
the pump system is configured such that a tilting of the swash plate back and forth about only one axis moves the plurality of bellows at least from the expanded position to the compressed position;
a vacuum pressure is generated by compressing the plurality of bellows into the compressed position and a subsequent recovery of the plurality of bellows from the compressed position to the expanded position generates the vacuum pressure within the wound dressing; and
the pump system is incorporated into the wound dressing to form a single unit.