Pump system for negative pressure wound therapy

A system for applying negative pressure therapy to a wound, comprising:

• a wound dressing including a wound cover that is sealable to skin surrounding a wound;
• a conduit having an end operatively associated with the wound dressing and an opposite end operatively associated with a suction source, to communicate suction to the wound;
• a waste collector disposed in the conduit between the wound dressing and the suction source for collecting liquids aspirated from the wound;
• a flow monitor to monitor flow of system fluid in the conduit from the wound dressing to the suction source, wherein the flow monitor comprises a non-numerical annunciator having an indicator that provides color-coded visual indications of flow conditions including an indication that the flow rate is within a range indicative of a blockage showing an occlusion in the system, normal operation, an indication that the flow rate is at a first level indicative of a first level of leakage in the system, and an indication that the flow rate is at a second level indicative of a second and higher level of leakage in the system;
• and
• an air filter/dryer dehumidifier having an air-impermeable, water vapor-permeable membrane disposed between the waste collector and the flow monitor for removing humidity from the system fluid.

A system for applying negative pressure therapy to a wound, comprising:

• a wound dressing including a wound cover that is sealable to skin surrounding a wound;
• a conduit having an end operatively associated with the wound dressing and an opposite end operatively associated with a suction source, to communicate suction to the wound;
• a waste collector disposed in the conduit between the wound dressing and the suction source for collecting liquids aspirated from the wound;
• a flow monitor to monitor flow of system fluid in the conduit from the wound dressing to the suction source, wherein the flow monitor comprises a non-numerical annunciator having an indicator that provides color-coded visual indications of flow conditions including an indication that the flow rate is within a range indicative of a blockage showing an occlusion in the system, normal operation, an indication that the flow rate is at a first level indicative of a first level of leakage in the system, and an indication that the flow rate is at a second level indicative of a second and higher level of leakage in the system;
• and
• a dehumidifier disposed between the waste collector and the flow monitor for removing humidity from the system fluid wherein the dehumidifier comprises an air-impermeable, water vapor-permeable membrane such that when higher humidity system fluid passes across a side of the membrane and lower humidity ambient air passes across an opposite side of the membrane, water vapor is transported through the membrane from the system fluid to the ambient air.