A pump assembly includes a chamber, a compressible conduit along a periphery of the chamber, an elongated sun member within the chamber, and an elongated planet member arranged to orbit around the sun member. The sun member includes a first portion at one axial end having a gear and a second portion at the other axial end. The planet member includes a first portion at one axial end with a gear engaged with the gear of the sun member and a second portion at the other axial end configured to be engaged with a section of the compressible conduit to constrict the section. The first portion has a different texture from the second portion, and teeth of the gears on either the sun member or the planet member are retained in an axial direction by the second portion of the other of the sun member and planet member.

A conveying device at least for conveying a conveying medium, includes at least one first conveying space, with at least one second conveying space, with at least one elastically deformable conveying element which delimits at least the first conveying space, and with at least one third conveying space. The at least the conveying element is embodied in spring-elastic fashion.

A microfluidic device is provided for managing fluid flow in disposable assay devices, which provides constant flow even at very low flow rates. Pumps utilizing the microfluidic device, as well as methods for manufacture and performing a microfluidic process are also provided.

The invention regards a micro dosage peristaltic pump (2) for micro dosage of a fluid, comprising: a housing (4) with an inner annular surface (5), wherein the annular surface comprises an opening (12), a flexible tube (6), wherein a section of the tube is placed upon the annular surface (5), a compression element (7) configured for peristaltic engagement with the section of the tube placed upon the annular surface (5), at least one counter acting element (11), an arm (10) comprising the compression element (7) and the counter acting element (11), wherein the arm (10) is rotatably mounted with a rotation axis perpendicular to the arm, driving means for rotating the arm (10), and thereby moving the compression element (7) and the counter acting element (11) in a circular motion.

The invention regards a micro dosage peristaltic pump (3) for micro dosage of a fluid, comprising: a housing (4) with an inner surface (5) comprising at least one circular section (6), a flexible tube (8) placed upon the at least one circular section of the surface, a flexible layer (9) placed between the surface and the flexible tube, at least one compression element (10), driving means for moving the at least one compression element in an eccentric circular motion having a circular circumference (14), whereby the at least one compression element is peristaltically engaged at the circumference with the tube placed upon the circular section of the surface.

A pump system can include a tube disposed about a rotor. The rotor can be configured to drive fluid through the tube as the rotor rotates. The tube can be replaceable when the tube fails. The pump system can include a processor configured to determine a predicted number of revolutions of the rotor before the tube fails based on a number n of past tube failure detection (TFD) events. Each past TFD event can have a corresponding n.sup.th TFD value based at least in part on the number of revolutions the rotor had rotated before the tube failed. When n=0, the predicted number of revolutions can be set to a putative value, and when n=1, the predicted number of revolutions can be based at least in part on the first TFD value and the putative value.

A peristaltic pump device includes a resilient tube secured in a pump housing with a rotor having rollers squeezing against the resilient tube facilitating the pumping of a liquid or gas. A cylindrical rotor rotates in a bore provided in the pump housing. The rotor has steps in which rollers freely slide and rotate. As the rotor rotates, the rollers also rotate and are slidingly held in the rotor step thereby frictional contact with the compressing resilient tube and consequently the liquid or gas within goes out of the resilient tube. The pump is inexpensive to build, reliable, and by design promotes the long life of the resilient tube as compared to existing roller type peristaltic pumps.

A tube pump includes a tube, a housing member having a cylindrical chamber including an inner peripheral surface, a rotator having a first shaft and a first portion, the first portion having a guide, and a roller having a first shank received by the guide. The tube pump includes a contact member having a contact portion in the cylindrical chamber extending outwardly towards the inner peripheral surface at least the first distance and less than the second distance, the contact portion being configured to selectively contact the roller.

There is provided a tube pump including: a first roller unit and a second roller unit that rotate around an axis while being in contact with a tube; a drive shaft coupled to the first roller unit; a drive cylinder arranged on an outer peripheral side of the drive shaft and coupled to the second roller unit; a first drive unit that rotates a first drive shaft around a first axis; a second drive unit that rotates a second drive shaft around a second axis; and a transmission mechanism that transmits a drive force of the second drive shaft to an outer peripheral surface of the drive cylinder, in which the first drive unit and the second drive unit are arranged so that a first arrangement position of the first drive unit and a second arrangement position of the second drive unit in a first axis direction overlap with each other.

A peristaltic pump for pumping a fluid includes a flexible tube and a roller. The flexible tube has inner and outer tubular opposed walls. The inner wall defines a through passage to receive the fluid. The roller has an outer contact surface. The peristaltic pump is configured to compress the flexible tube with the contact surface of the roller to thereby force the fluid through the through passage. At least the contact surface of the roller is formed of borosilicate glass.