Canister status determination for negative pressure wound therapy devices

A negative pressure wound therapy device comprising:

• a device housing;
• a negative pressure source supported by the device housing, the negative pressure source configured to provide negative pressure to a wound covered by a wound dressing;
• a canister configured to be in fluid communication with the negative pressure source and the wound dressing, the canister comprising:
• a canister housing comprising a first body portion and a second body portion, and configured to store fluid aspirated from the wound;
• a base support positioned inside the canister housing and comprising a filter support portion and one or more support tabs, wherein the base support is connected to the first body portion of the canister housing, and wherein the first body portion is configured to be connected to the device housing when the canister is removably attached to the device housing;
• a fluid level sensor supported by the one or more support tabs of the base support, the fluid level sensor comprising a pair of arms extending into an interior of the canister housing and configured to be in fluid communication with fluid aspirated from the wound, wherein the fluid level sensor is configured to detect a completed electrical circuit when the fluid aspirated from the wound comes into contact with the pair of arms of the fluid level sensor, and wherein the fluid level sensor is configured to detect a canister full condition when the electrical circuit is completed;
• and an electronic circuitry configured to detect a state of the fluid level sensor and provide an indication of a status of the canister;
• and
• a filter assembly supported by the filter support portion of the base support.