System And Method For Negative Pressure Wound Therapy

A system for negative pressure wound therapy, the system comprising:

• a pump fluidly coupled to a wound site and configured to generate a negative wound pressure at the wound site;
• a pressure sensor disposed in fluid communication with the wound site and configured to generate a pressure signal indicative of the negative wound pressure at the wound site;
• and
• a controller communicably coupled to the pump and the pressure sensor, wherein the controller is configured to determine the negative wound pressure based on the pressure signal received from the pressure sensor and operate the pump in a plurality of cycles, wherein the plurality of cycles are disposed adjacent to each other with respect to time, and wherein, in each cycle, the controller is further configured to:
• define an upper negative target pressure and a lower negative target pressure, wherein a magnitude of the upper negative target pressure is greater than a magnitude of the lower negative target pressure;
• switch off the pump when the negative wound pressure reaches the upper negative target pressure of the cycle;
• determine a rate of decrease of the negative wound pressure with respect to time from the upper negative target pressure to the lower negative target pressure of the cycle due to a leakage from the wound site after switching off the pump;
• determine a rate of increase of the negative wound pressure with respect to time having a same magnitude as that of the rate of decrease of the negative wound pressure;
• switch on the pump when the negative wound pressure reaches the lower negative target pressure of the cycle;
• and
• operate the pump to increase the negative wound pressure from the lower negative target pressure at the rate of increase of the negative wound pressure.

A method for negative pressure wound therapy, the method comprising:

• providing a pump fluidly coupled to a wound site and configured to generate a negative wound pressure at the wound site;
• providing a pressure sensor disposed in fluid communication with the wound site and configured to generate a pressure signal indicative of the negative wound pressure at the wound site;
• determining, via a controller, the negative wound pressure based on the pressure signal received from the pressure sensor;
• and
• operating, via the controller, the pump in a plurality of cycles based at least on the negative wound pressure, wherein the plurality of cycles are disposed adjacent to each other with respect to time, and wherein each cycle comprises:
• defining an upper negative target pressure and a lower negative target pressure, wherein a magnitude of the upper negative target pressure is greater than a magnitude of the lower negative target pressure;
• determining a fall line decreasing from the upper negative target pressure to the lower negative target pressure;
• determining a rise line increasing from the lower negative target pressure to the upper negative target pressure and extending from the fall line, wherein the fall line of a subsequent cycle of the plurality of cycles extends from the rise line of the cycle;
• switching off the pump when the negative wound pressure reaches the upper negative target pressure of the cycle;
• switching on the pump when the negative wound pressure decreases from the upper negative target pressure to the rise line of the cycle above the lower negative target pressure due to a leakage from the wound site after switching off the pump;
• and
• operating the pump such that the negative wound pressure increases along the rise line of the cycle.

A method for negative pressure wound therapy, the method comprising:

• providing a pump fluidly coupled to a wound site and configured to generate a negative wound pressure at the wound site;
• providing a pressure sensor disposed in fluid communication with the wound site and configured to generate a pressure signal indicative of the negative wound pressure at the wound site;
• determining, via a controller, the negative wound pressure based on the pressure signal received from the pressure sensor;
• and
• operating, via the controller, the pump in a plurality of cycles based at least on the negative wound pressure, wherein the plurality of cycles are disposed adjacent to each other with respect to time, and wherein each cycle comprises:
• defining an upper negative target pressure and a lower negative target pressure, wherein a magnitude of the upper negative target pressure is greater than a magnitude of the lower negative target pressure;
• switching off the pump when the negative wound pressure reaches the upper negative target pressure of the cycle;
• determining a rate of decrease of the negative wound pressure with respect to time from the upper negative target pressure to the lower negative target pressure of the cycle due to a leakage from the wound site after switching off the pump;
• determining a rate of increase of the negative wound pressure with respect to time having a same magnitude as that of the rate of decrease of the negative wound pressure;
• switching on the pump when the negative wound pressure reaches the lower negative target pressure of the cycle;
• and
• operating the pump to increase the negative wound pressure from the lower negative target pressure at the rate of increase of the negative wound pressure.