Canister status detection in wound for pressure therapy systems

A wound therapy apparatus, comprising:

• a negative pressure source configured to provide negative pressure, via a fluid flow path, to a wound covered by a wound dressing;
• a canister configured to be positioned in the fluid flow path;
• a pressure sensor configured to monitor pressure in the fluid flow path;
• and
• an electronic control circuitry configured to:
• control provision of negative pressure by the negative pressure source;
• determine that a canister is empty based on monitoring changes in at least one characteristic of pressure over time;
• and
• provide a first indication in response to determining that the canister is empty.

A method of operating a wound therapy apparatus, the method comprising:

• by an electronic control circuitry of the wound therapy apparatus:
• controlling provision of negative pressure to a wound covered by a wound dressing with a negative pressure source of the wound therapy apparatus, the negative pressure source configured to be connected to the wound via a fluid flow path;
• and
• at a first time:
• determining that a canister is empty based on monitoring changes in at least one characteristic of pressure in the fluid flow path over time;
• and
• providing a first indication in response to determining that the canister is empty.