A wearable infusion device, which is wearable on the body of a patient, comprising:
- at least one reservoir for holding an infusion liquid;
- a first pump, which comprises a first pump housing and a controllably driven first plunger which are bounding a first pump chamber, wherein the first plunger is reciprocally moveable to perform first intake strokes and first expel strokes, which are directed outwardly and inwardly of the first pump housing, respectively, thereby increasing and decreasing, respectively, the volume of the first pump chamber;
- a second pump, which comprises a second pump housing and a controllably driven second plunger which are bounding a second pump chamber, wherein the second plunger is reciprocally moveable to perform second intake strokes and second expel strokes, which are directed outwardly and inwardly of the second pump housing, respectively, thereby increasing and decreasing, respectively, the volume of the second pump chamber;
- a first valve, which comprises a first reservoir port, a first pump port and a first patient port;
- and wherein the first valve is controllably switchable between:
- a first communication-with-the-reservoir valve position, in which the first reservoir port and the first pump port are open, and the first patient port is closed,
- a first communication-with-the-patient valve position, in which the first pump port and the first patient port are open and the first reservoir port is closed, and
- a first closed valve position, in which the first reservoir port, the first pump port and the first patient port are closed,
- a second valve, which comprises a second reservoir port, a second pump port and a second patient port;
- and wherein the second valve is controllably switchable between:
- a second communication-with-the-reservoir valve position, in which the second reservoir port and the second pump port are open, and the second patient port is closed,
- a second communication-with-the-patient valve position, in which the second pump port and the second patient port are open and the second reservoir port is closed, and
- a second closed valve position, in which the second reservoir port, the second pump port and the second patient port are closed;
- a reservoir-pump fluid-path structure, which:
- is connected to the at least one reservoir, and
- is connected, via the first reservoir port and the first pump port of the first valve, to the first pump for transporting, in said first communication-with-the-reservoir valve position of the first valve, said infusion liquid from the at least one reservoir to the first pump, and vice versa, and
- is connected, via the second reservoir port and the second pump port of the second valve, to the second pump for transporting, in said second communication-with-the-reservoir valve position of the second valve, said infusion liquid from the at least one reservoir to the second pump, and vice versa;
- a pump-patient fluid-path structure, which:
- is connectable to a patient wearing the wearable infusion device, and
- is connected, via the first patient port and the first pump port of the first valve, to the first pump for transporting, in said first communication-with-the-patient valve position of the first valve, said infusion liquid from the first pump to the patient, and vice versa, and
- is connected, via the second patient port and the second pump port of the second valve, to the second pump for transporting, in said second communication-with-the-patient valve position of the second valve, said infusion liquid from the second pump to the patient, and vice versa;
- an orientation detector for detecting an orientation of the wearable infusion device relative to the earth's horizontal;
- and
- a controller configured for controlling of driving the first plunger and the second plunger, and for controlling of switching valve positions of the first valve and the second valve, and wherein the controller is further configured for determining a tilt angle alert condition in which a tilt angle detected by the orientation detector exceeds a predetermined threshold value.