Negative pressure wound therapy device with silent piezoelectric pump

A method, comprising:

• generating a first control signal having a first root mean square (RMS) voltage;
• transmitting the first control signal to at least one piezoelectric pump configured to apply a vacuum to a wound site;
• identifying at least one of a change of state of the at least one piezoelectric pump or an expiration of a duration of time associated with operation of the at least one piezoelectric pump;
• responsive to identifying the at least one of the change of state or the expiration of the duration of time, generating a second control signal having a non-zero second RMS voltage less than the first RMS voltage;
• transmitting the second control signal to the at least one piezoelectric pump;
• receiving a first temperature of the at least one piezoelectric pump, wherein identifying the change includes comparing the first temperature to a first temperature threshold and determining that the first temperature is greater than the first temperature threshold;
• and
• receiving a first resonance frequency of the at least one piezoelectric pump from a resonance detector and identifying the change of state based on the first resonance frequency.

A non-transitory computer readable medium storing computer executable instructions which when executed by a control circuit, cause the control circuit to perform a method comprising:

• generating a first control signal having a first root mean square (RMS) voltage;
• transmitting the first control signal to at least one piezoelectric pump configured to apply a vacuum to a wound site;
• identifying at least one of a change of state of the at least one piezoelectric pump or an expiration of a duration of time associated with operation of the at least one piezoelectric pump;
• responsive to identifying the at least one of the change of state or the expiration of the duration of time, generating a second control signal having a non-zero second RMS voltage less than the first RMS voltage;
• and
• transmitting the second control signal to the at least one piezoelectric pump;
• receiving a first temperature of the at least one piezoelectric pump, wherein identifying the change includes comparing the first temperature to a first temperature threshold and determining that the first temperature is greater than the first temperature threshold;
• and
• receiving a first resonance frequency of the at least one piezoelectric pump from a resonance detector and identifying the change of state based on the first resonance frequency.