A peristaltic pump for an apparatus for extracorporeal blood treatment, especially for a dialysis machine, for conveying fluid in the apparatus is disclosed. The peristaltic pump includes a rotor driven by a drive shaft, the rotor interacting with an elastically deformable fluid line so as to form a cross-sectional constriction which is displaced along the fluid line for conveying fluid by rotation of the rotor, wherein the rotor is coupled to the drive shaft by a coupling structure so as to transmit a torque, wherein the coupling structure couples the rotor and the drive shaft with a play in the direction of rotation relative to each other.

A peristaltic pump and an analyzer for testing a biological sample, wherein the pump includes a pump head that is constructed as a screwless assembly, wherein the pump includes a bayonet and/or a beam coupling, and/or wherein rollers of the pump are configured to be pivoted about corresponding pivot axes that intersect with the roller axes.

The present invention relates to a peristaltic pump including planetary rollers (6) configured to revolve around a rotor driving the planetary rollers, wherein the rotor is configured to push the planetary rollers against a flexible tube such that the flexible tube is squeezed between the planetary rollers and a wall of a pump housing. In order to facilitate the assembly and/or reduce the manufacturing cost and/or reduce the operating noise, a contact surface between the rotor and the planetary rollers is toothless.

A mechanism for adjusting occlusion of a roller pump is described, wherein the mechanism is provided with: an elongated rod member oriented on a central axis of a pump head of the roller pump; and a drive member attached to the elongated rod member so as to move along the elongated rod member between a first position and a second position, wherein the drive member is connected to each roller block of a pump rotor of the pump head so that movement of the drive member by constant increments along the elongated rod member causes non-uniform and/or non-linear incremental movement of each roller block in a direction radial to the central axis of the pump head.

A method for pumping a fluid includes providing a peristaltic pump including a contact wall, an opposing, movable compression element, and a flexible tube interposed between the contact wall and the compression element in a compressing region. The flexible tube has a tube lengthwise axis and a through passage. The flexible tube is displaceable relative to the compressing region between a first position and a second position different from the first position. The method includes: with the flexible tube in the first position, compressing the flexible tube between the compression element and the contact wall to thereby force the fluid through the through passage; thereafter displacing the flexible tube into the second position from the first position; and thereafter, with the flexible tube in the second position, compressing the flexible tube between the compression element and the contact wall to thereby force the fluid through the through passage.

A device for supplying and/or aspirating a fluid substance to or from a human or animal body is provided, which device has a drive unit with a drive, an attachment part which is attachable to the drive unit, and also a coupling element. The attachment part has a peristaltic pump unit with a pump head having one or more roller elements which are movable freely and independently of one another and serve for rolling on a hose. The coupling element serves to transmit a movement from the drive to the pump head. The pump head has a state in which it is decoupled from the coupling element, and in which the one or more roller elements apply no mechanical pressure or a comparatively low mechanical pressure to the hose, and also a state in which it is coupled to the coupling element, and in which the one or more roller elements are pressed by the coupling element against the hose with a comparatively high mechanical pressure.

A rotor assembly for a peristaltic pump is provided. The rotor assembly includes a hub configured to couple with a drive shaft of a pump. The hub includes at least one receiving slot that extends longitudinally along an outer surface of the hub. The rotor assembly further includes a roller assembly configured to slide longitudinally along the receiving slot to seat the roller assembly onto the hub.

Certain aspects of the present disclosure provide a surgical cassette configured to engage a first plurality of rollers of a first roller head. The cassette comprises a face coupled to a first substrate, the face being at a first angle with respect to the first roller head's axis of rotation and a wall of first substrate being at a second angle with respect to the axis of rotation, wherein the first angle is different from the second angle. The cassette also comprises a first sheet positioned on the wall's surface, wherein the first sheet and the wall form first one or more pump segments configured to engage the first plurality of rollers in a position where force applied by each one of the first plurality of rollers on the first one or more pump segments has a direction that is not parallel to the first roller head's axis of rotation.

Described is a peristaltic pump comprising a casing which has a casing bottom, a casing cover and a casing wall extending from the casing bottom to the casing cover, which form a pump chamber, a tube which connects a casing inlet to a casing outlet and is arranged within the pump chamber, and a displacement element which has at least two displacement members and is fixed to a rotor which is rotatable about a rotor axis so that in the rotary movement of the rotor each displacement member performs a movement in an operative plane, wherein the tube is arranged between the casing wall and the displacement element in such a way that due to rotation of the rotor the displacement members roll on the tube so the tube is squashed together so that a medium to be conveyed which is in the tube is displaced in the direction of the casing outlet. The displacement element is of a two-part structure comprising a first part which is fixed to the rotor and a second part which has a displacement member, wherein the second part of the displacement element in a position of the rotor relative to the first part of the displacement element can be reciprocated between an operative position in which the operative planes of the two displacement members are identical and a change position in which the operative planes of the two displacement members are arranged parallel to each other.

A peristaltic pump has an arcuate raceway with a partially concave inner surface extending through an arc of at least one hundred eighty degrees (180). The arc defines a midpoint, and a rotor faces the inner surface of the raceway and is both rotatable relative to the raceway and translationally movable relative to the raceway between a pump position, wherein the rotor is spaced from the midpoint a first distance, and a tube load position, wherein the rotor is spaced from the midpoint a second distance greater than the first distance. A motor is coupled to the rotor to rotate the rotor plural are rollers arranged on the rotor to contact tubing disposed between the rotor and the raceway when the rotor is in the pump position. The motor is prevented from stopping at a predetermined angular position to facilitate loading and unloading tubing.