Pump cassettes with positioning feature and infusion pump systems

A pump cassette comprising:

• a rigid body comprising a compliant membrane, two opposing edge sections, and an interface-facing surface, wherein the rigid body comprises a controllable fluid pathway including a pump chamber, the controllable fluid pathway defined in part by the compliant membrane and extending from an inlet port to an outlet port, wherein the rigid body includes a positioning feature on the frame portion and arranged substantially orthogonal to a general plane of the interface-facing surface, the positioning feature configured to mechanically interact with a first corresponding positioning feature on a surface of a cassette recess of an infusion pump for positioning of the pump cassette within the cassette recess;
• a pump assembly including a pump drive mechanism operably accessible from the interface-facing surface, wherein the pump drive mechanism is longitudinally articulable with respect to the rigid body;
• and
• a slider coupled to the two opposing edge sections and longitudinally articulable with respect to the rigid body.

A pump cassette comprising:

• a rigid body comprising a frame portion, a base portion, a compliant membrane disposed substantially therebetween, two opposing edge sections, and an interface-facing surface;
• a controllable fluid pathway defined at least in part by the base portion and the compliant membrane;
• a first positioning feature on the frame portion and arranged substantially orthogonal to a general plane of the interface-facing surface, the first positioning feature configured to mechanically interact with a first corresponding positioning feature on a surface of a cassette recess of an infusion pump for positioning of the pump cassette within the cassette recess;
• and
• a pump assembly including a pump drive mechanism operably accessible from the interface-facing surface, wherein the pump drive mechanism is longitudinally articulable with respect to the rigid body.