Patent ID: 11964093
Assignee: SMITH & NEPHEW PLC
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 5:
6. A reduced pressure treatment system comprising:
a dressing adapted to be positioned at a tissue site;
a first reservoir adapted to be in fluid communication with the dressing and adapted to deliver a desired negative pressure to the tissue site at a first negative pressure level;
a second reservoir adapted to store a negative pressure at a second negative pressure level;
a single conduit adapted to provide fluid communication between the first reservoir and the second reservoir, wherein the single conduit pneumatically connects the first reservoir and the second reservoir in series;
a first valve positioned in the single conduit, the first valve adapted to close in response to a first pressure difference between the first reservoir and the second reservoir and open in response to a second pressure difference between the first reservoir and the second reservoir; and
a second valve coupled to the second reservoir and adapted to be in fluid communication with a pump to permit evacuation of the second reservoir to an increased negative pressure,
wherein negative pressure is communicated from the pump through the second valve to the second reservoir and from the second reservoir through the first valve to the first reservoir, and
wherein the first valve, the first reservoir, the second valve, and the second reservoir are arranged in series along the single conduit.