Micropump

A pump comprising a rotor comprising a motor portion, first and second axial extensions having different diameters extending therefrom, a stator comprising a stator housing having a rotor chamber for receiving at least the axial extensions therein, and first and second seals mounted around the first and second axial extensions, the axial extensions being provided with liquid supply channels cooperating with the respective first and second seals to create first and second valves that open and close liquid communication across the respective seal as a function of at least an angular displacement of the rotor, wherein the pump comprises a third seal mounted around the second axial extension proximate a motor portion of the rotor, delimiting an outlet portion of the rotor chamber.

A patch pump device comprising a disposable unit including a reservoir and a pump mounted to the reservoir, said pump comprising a stator, a rotor comprising an axial extension slidably and rotatably mounted at least partially in a rotor chamber of the stator, and at least a first valve between an inlet and the rotor chamber, and at least a second valve between the rotor chamber and an outlet, wherein both the first valve and the second valve open and close as a function of at least an angular displacement of the rotor, the pump further comprising interacting rotor cam element and stator cam element on the rotor and stator respectively, and biasing means acting on the rotor for applying a force on the rotor in an axial direction of the stator cam element, said rotor cam element and stator cam element being configured such that they are separated by a certain axial distance h at a specified angular position of the rotor in respect to the stator when both valves are closed and at said specified angular position said rotor cam element is not in contact with said stator cam element.

A patch pump device comprising a disposable unit including a reservoir and a pump mounted to the reservoir, said pump comprising a rotor comprising a motor portion, first and second axial extensions having different diameters extending therefrom, a stator comprising a stator housing having a rotor chamber for receiving at least the axial extensions therein, and first and second seals mounted around the first and second axial extensions, the axial extensions being provided with liquid supply channels cooperating with the respective first and second seals to create first and second valves that open and close liquid communication across the respective seal as a function of at least an angular displacement of the rotor, wherein the pump comprises a third seal mounted around the second axial extension proximate a motor portion of the rotor, delimiting an outlet portion of the rotor chamber.

A method of operating a pump including a stator, a rotor comprising an axial extension slidably and rotatably mounted at least partially in a rotor chamber of the stator, and at least first and second valves between an inlet and the rotor chamber, respectively between the rotor chamber and an outlet, wherein both the first valve and the second valve open and close as a function of at least an angular position of the rotor, the method including:

• detecting axial displacement of the rotor as a function of the angular position of the rotor;
• and
• comparing the axial displacement detected with an expected displacement value in order to determine if there is a malfunction due to blockage downstream, leakage of a valve, or air in the rotor chamber.

A method of operating a pump including a stator, a rotor comprising an axial extension slidably and rotatably mounted at least partially in a rotor chamber of the stator, and at least a first valve between an inlet and the rotor chamber, and a second valve between the rotor chamber and an outlet, wherein both the first valve and the second valve open and close as a function of at least an angular displacement of the rotor, the pump further comprising interacting rotor cam element on the rotor and stator cam element on the stator and biasing means acting on the rotor for applying a force on the rotor in the axial direction of the stator cam elements, the method including:

• turning the rotor one or more cycles in a pumping direction;
• and
• subsequently reversing the rotor rotation until a shoulder of the rotor cam element and a shoulder of the stator cam element abut in order to define a reference angular position of the rotor relative to the stator.

A pump including a stator, a rotor comprising an axial extension slidably and rotatably mounted at least partially in a rotor chamber of the stator, and at least a first valve between an inlet and the rotor chamber, and at least a second valve between the rotor chamber and an outlet, wherein both the first valve and the second valve open and close as a function of at least an angular displacement of the rotor, the pump further comprising interacting rotor cam element on the rotor and stator cam element on the stator, and biasing means acting on the rotor for applying a force on the rotor in an axial direction of the stator cam element, said rotor cam element and stator cam element being configured such that they are separated by a certain axial distance h at a specified angular position of the rotor in respect to the stator when both valves are closed, wherein the rotor comprises at least first and second axial extensions having different diameters, and first and second seals mounted around the first and second axial extensions, the axial extensions being provided with liquid supply channels cooperating with the respective first and second seals to create first and second valves that open and close liquid communication across the respective seal as a function of at least the angular displacement of the rotor.