Portable negative pressure wound therapy device

A portable negative pressure wound therapy system comprising,

• a dressing assembly for positioning over a wound to apply a negative pressure to the wound;
• and
• a canister assembly dimensioned to be worn by a user, said canister assembly including:
• a control unit having a negative pressure source, a controller, and a pressure transducer operable to measure a pressure level in said collection canister;
• and
• a collection canister in communication with the dressing assembly and having a chamber operable to receive fluid from the wound, the collection canister including:
• a suction port in fluid communication with said negative pressure source;
• and
• a ball float arrangement having a ball float operable to substantially close said suction port in response to one of collection of a predetermined volume of exudate in the collection canister, tilting of the collection canister beyond a predetermined angle of orientation or inversion of the collection canister, wherein
• said control unit further comprises a first transducer port coupled to said pressure transducer, said first transducer port has a protrusion coupled thereto;
• and
• said collection canister has a second transducer port, said second transducer port having a valve to prevent exudate from exiting said collection canister,
• said protrusion opens said valve when said control unit is attached to said collection canister so that said pressure transducer can measure the pressure level in said collection canister.

A portable negative pressure wound therapy system comprising,

• a dressing assembly for positioning over a wound to apply a negative pressure to the wound;
• and
• a canister assembly dimensioned to be worn by a user, said canister assembly including:
• a control unit having a negative pressure source and a controller;
• and
• a collection canister in communication with the dressing assembly and having a chamber operable to receive fluid from the wound, the collection canister including:
• a suction port in fluid communication with said negative pressure source;
• and
• a ball float arrangement having a ball float operable to substantially close said suction port in response to one of collection of a predetermined volume of exudate in the collection canister, tilting of the collection canister beyond a predetermined angle of orientation or inversion of the collection canister,
• wherein said ball float has a coating, said coating includes a hydrophobic material, latex, or polytetrafluoroethylene (PTFE).