Electro-mechanical pump controller for negative-pressure treatment

A system for negative-pressure treatment, the system comprising:

• a dressing;
• an enclosure having a port and a variable volume compressible to a minimum volume;
• a container fluidly coupled to the dressing through the enclosure;
• a first one-way valve configured to allow fluid ingress to the enclosure from the dressing through the port;
• a second one-way valve configured to allow fluid egress from the enclosure to the container through the port;
• an actuator coupled to the enclosure to compress the enclosure to the minimum volume;
• a DC motor coupled to the actuator and configured to draw a current for operating the actuator to compress the enclosure;
• and
• a controller coupled to the motor and configured to turn on the motor causing the actuator to compress the enclosure until the enclosure is compressed to the minimum volume, and turn off the motor in response to the current being less than or equal to a minimum current value.

A method of providing negative-pressure treatment to a tissue site, the method comprising:

• placing a tissue interface proximate to the tissue site;
• placing a cover over the tissue interface;
• sealing the cover to an attachment surface peripheral to the tissue site;
• fluidly coupling the tissue interface to a port of an enclosure having a variable volume;
• fluidly coupling a container to the tissue interface through the port of the enclosure;
• detachably coupling the enclosure to an actuator driven by a motor;
• applying current to the motor to activate the actuator including:
• extending the actuator to apply a linear force on the enclosure to compress the variable volume to expel fluid through the port into the container;
• retracting the actuator to remove the linear force from the enclosure to allow the variable volume to expand and draw fluid from the tissue site into the enclosure through the port;
• and
• turning off the motor in response to the current being less than or equal to a minimum current value.