Patent ID: 8808259

Claim:
An apparatus for the application of topical negative pressure therapy to a site on the skin of the body of a mammal, the apparatus comprising: a dressing configured to sealingly cover the site, the dressing comprising: a base portion configured to be supported by the skin surrounding the site, the base portion comprising an aperture formed axially therethrough; a detachable portion removably supportable by the base portion; and a flexible membrane removably supportable by the base portion between the base portion and the detachable portion, the flexible membrane being configured to at least cover the aperture formed in the base portion; a conduit in fluid communication with the dressing; a first suction device comprising a syringe and second suction device comprising a syringe in fluid communication with the conduit and configured to individually and simultaneously provide a source of reduced pressure to the site; a valve member in fluid communication with the conduit and the first and second suction devices, the valve being configured to regulate a flow of fluid through the conduit; and a constant tension spring member coupled to the syringe of at least one of the first and the second suction devices, the constant tension spring member configured to provide power to the syringe of at least one of the first suction device and the second suction device to generate negative pressure at the dressing; wherein: each of the base portion, the detachable portion, and the membrane are formed from a substantially impermeably material; the dressing is configured to form an approximately hermetically sealed enclosure over the site when the detachable portion and the flexible membrane are supported by the base portion; the base portion and the detachable portion comprise mutually engageable connection features; and the first and second suction devices are arranged in parallel.