Systems and methods for extending operational time of negative pressure wound treatment apparatuses

A negative pressure wound therapy system comprising:

• a source of negative pressure configured to aspirate fluid from a wound covered by a wound dressing;
• a power source;
• a boost converter circuitry configured to receive power at a first power level from the power source and supply power at a second power level to the source of negative pressure to cause the source of negative pressure to aspirate fluid from the wound at a first negative pressure level, the second power level being higher than the first power level;
• and
• a controller configured to, in response to a determination that a capacity of the power source is being depleted, cause the boost converter circuitry to supply power to the source of negative pressure at a third power level lower than the second power level and cause the source of negative pressure to aspirate fluid from the wound at a second negative pressure level that is more positive than the first negative pressure level, the second negative pressure level being below atmospheric pressure.

A method of operating a negative pressure wound therapy system, the method comprising:

• increasing power provided from a power source of the negative pressure wound therapy system at a first power level to a second power level;
• supplying power at the second power level to a source of negative pressure of the negative pressure wound therapy system and causing the source of negative pressure to provide negative pressure at a first negative pressure level to aspirate fluid from a wound covered by a wound dressing;
• and
• determine that a capacity of the power source is being depleted;
• in response to determining that the capacity of the power source is being depleted, decreasing power from the second power level to a third power level and supplying power to the source of negative pressure at the third power level and causing the source of negative pressure to provide negative pressure to aspirate fluid from the wound covered by the wound dressing at a second negative pressure level that is more positive than the first negative pressure level, the second negative pressure level being below atmospheric pressure,
• wherein the method is performed under control of a controller of the negative pressure wound therapy system.