Negative pressure wound therapy device using a vacuum generating pump providing audible therapy feedback

A negative pressure wound therapy device, comprising:

• at least one piezoelectric pump configured to apply a vacuum to a wound site;
• a state detector configured to detect a state of the at least one piezoelectric pump;
• and
• a control circuit configured to:
• transmit a first control signal to the at least one piezoelectric pump to drive the at least one piezoelectric pump for a first period of time, the first control signal having a first root mean square (RMS) voltage, the first RMS voltage greater than or equal to a threshold voltage at which driving the at least one piezoelectric pump for at least a second period of time greater than the first period of time causes the at least one piezoelectric pump to emit sound at a magnitude greater than a sound threshold;
• receive a first indication of the state from the state detector;
• determine, based on the first indication of the state, if the at least one piezoelectric pump is in a leak condition;
• transmit, responsive to the at least one piezoelectric pump not being in the leak condition, a second control signal to the at least one piezoelectric pump to drive the at least one piezoelectric pump, the second control signal having a second RMS voltage less than the first RMS voltage;
• and
• transmit, responsive to the at least one piezoelectric pump being in the leak condition, a third control signal to the at least one piezoelectric pump to drive the at least one piezoelectric pump, the third control signal having a third RMS voltage greater than the second RMS voltage.