A pump is provided with a pump housing, a vibrating portion, a driving portion, and a displacement regulating portion. The pump housing internally has a pump chamber. The vibrating portion is supported against the pump housing in the pump chamber and divides the pump chamber into a first pump chamber and a second pump chamber. The driving portion drives the vibrating portion so as to bend and vibrate the vibrating portion in a predetermined direction. The displacement regulating portion is positioned to prevent displacement of the vibrating portion that results in plastic deformation.

A pump is provided with a pump housing, a vibrating portion, a driving portion, and a displacement regulating portion. The pump housing internally has a pump chamber. The vibrating portion is supported against the pump housing in the pump chamber and divides the pump chamber into a first pump chamber and a second pump chamber. The driving portion drives the vibrating portion so as to bend and vibrate the vibrating portion in a predetermined direction. The displacement regulating portion is positioned to prevent displacement of the vibrating portion that results in plastic deformation.

A piezoelectric cooling system and method for driving the cooling system are described. The piezoelectric cooling system includes a first piezoelectric cooling element and a second piezoelectric cooling element. The first piezoelectric cooling element is configured to direct a fluid toward a surface of a heat-generating structure. The second piezoelectric cooling element is configured to direct the fluid to an outlet area after heat has been transferred to the fluid by the heat-generating structure.

A piezoelectric cooling system and method for driving the cooling system are described. The piezoelectric cooling system includes a first piezoelectric cooling element and a second piezoelectric cooling element. The first piezoelectric cooling element is configured to direct a fluid toward a surface of a heat-generating structure. The second piezoelectric cooling element is configured to direct the fluid to an outlet area after heat has been transferred to the fluid by the heat-generating structure.

Pump cassettes, wound-treatment apparatuses and methods. In some embodiments, a pump cassette comprises: a pump body having a pump chamber, an inlet valve in fluid communication with the pump chamber, and an outlet valve in fluid communication with the pump chamber; a diaphragm coupled to the pump body such that the diaphragm is movable to vary a volume in the pump chamber; and an identifier configured to store one or more properties of the pump cassette such that the identifier is readable by an automated reader to determine the one or more properties. In some embodiments, the pump cassette is configured to be removably coupled to a wound-treatment apparatus having an actuator such that the actuator can be activated to move the diaphragm.

Pump cassettes, wound-treatment apparatuses and methods. In some embodiments, a pump cassette comprises: a pump body having a pump chamber, an inlet valve in fluid communication with the pump chamber, and an outlet valve in fluid communication with the pump chamber; a diaphragm coupled to the pump body such that the diaphragm is movable to vary a volume in the pump chamber; and an identifier configured to store one or more properties of the pump cassette such that the identifier is readable by an automated reader to determine the one or more properties. In some embodiments, the pump cassette is configured to be removably coupled to a wound-treatment apparatus having an actuator such that the actuator can be activated to move the diaphragm.

A fluid control device has a housing. A first main plate of the housing includes a vibration portion, on which a drive body is disposed, having a rotationally symmetric shape in plan view, and multiple openings which is formed outside the vibration portion and through which a pump chamber and the outside communicate with each other. A second main plate includes an opening through which the pump chamber and the outside communicate with each other and which has a rotationally symmetric shape in plan view. The opening is arranged to include the center of the vibration portion in plan view of the first main plate and the second main plate. An opening area of the opening is from 10% to 75% of an area of the vibration portion.

A fluid control device has a housing. A first main plate of the housing includes a vibration portion, on which a drive body is disposed, having a rotationally symmetric shape in plan view, and multiple openings which is formed outside the vibration portion and through which a pump chamber and the outside communicate with each other. A second main plate includes an opening through which the pump chamber and the outside communicate with each other and which has a rotationally symmetric shape in plan view. The opening is arranged to include the center of the vibration portion in plan view of the first main plate and the second main plate. An opening area of the opening is from 10% to 75% of an area of the vibration portion.

A fluid control device includes a pump and an outer housing containing the pump. The outer housing has a first outer wall that forms an internal space on a flat plate side of the pump and that has a through hole allowing the internal space and an external space to communicate with each other. The first outer wall includes an outer wall main plate facing a piezoelectric element, and a side plate that is connected to the outer wall main plate and that has the through hole. The outer wall main plate has a higher thermal conductivity than that of a second outer wall.

A fluid control device includes a pump and an outer housing containing the pump. The outer housing has a first outer wall that forms an internal space on a flat plate side of the pump and that has a through hole allowing the internal space and an external space to communicate with each other. The first outer wall includes an outer wall main plate facing a piezoelectric element, and a side plate that is connected to the outer wall main plate and that has the through hole. The outer wall main plate has a higher thermal conductivity than that of a second outer wall.