A dual-head, pulseless peristaltic-type pump comprises a pump housing, cover, two compressible tube chambers and two sets of rotatable occluding members. An off-center drive axis driven by motor or other rotational mechanism rotate inner large diameter disk. Balls or rollers between inner disk rotate in one direction from center drive axis where the outer ring is stationary and occludes the tube by linear motion without friction between tube and outer ring. The linear roller occluding motion transfers liquid or slurry from inlet to outlet of tube. In one embodiment, two separate sets of occluding members are installed 180 degree opposite to each other such that pulsations are compensated for and canceled out.

Embodiments of pumps are described herein that may be used as peristaltic pumps. The pumps may include features that provide for quiet operation as well as automatically loading of tubing. Embodiments may be implemented in blood separation systems.

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.

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 rotor motor is coupled to the rotor to rotate the rotor and rollers arranged on the rotor to contact tubing disposed between the rotor and the raceway when the rotor is in the pump position. A loading motor moves the rotor toward and away from the raceway.

A peristaltic pump (10) comprises a drivable rotor (14), having at least one pressing member (15), and a cylindrical stator (12) in which the rotor (14) is rotatable. Flexible tubing (22), having an inlet side (24) and an outlet side (26), extends circumferentially around the cylindrical stator (12) against an inner wall (12a). The peristaltic pump (10) includes a radially deformable ring (28) positioned between the rotor (14) and the circumferentially extending flexible tubing (22). The ring (28) is deformed by the pressing member (15) upon rotation of the rotor (14) and this compresses the flexible tubing (22) against the inner wall (12a) of the cylindrical stator (12) to convey liquid along the flexible tubing (22). The radially deformable ring (28) includes a ring anchor (30) which prevents rotation of the radially deformable ring (28) during rotation of the rotor (14).

A peristaltic pump head includes a housing assembly adapted for mounting to a drive mechanism, a roller assembly arranged with the housing assembly and a flexible conduit extending through the housing assembly and engageable by the roller assembly to impel fluid therethrough. The roller assembly and the flexible conduit are removable from the housing assembly without disconnecting the entire housing assembly from the drive mechanism. The roller assembly can include an axially extending drive shaft, a roller control body fixedly mounted to the drive shaft, at least a first end plate rotatably mounted about the drive shaft, and at least a first roller arm pivotably mounted to the first end plate. The flexible conduit can include a length of hollow tubing made of an elastomeric material, and at least one overmolded end fitting made of a rigid polymeric material and fused to an end of the hollow tubing.

The present invention involves a rotary peristaltic pump and associated method employing the relaxation of pressure on flexible tubing between the rotor and stator of the pump to restore the rotor to a start angle while a valve on the output of the pump is closed to avoid progress of fluid through the system. Three different implementations of the pump and method are presented including reciprocating the stator, reciprocating the rotor, and retracting the idler rollers of the rotor into the rotor to relieve the pressure on the flexible tubing. A controller ensures the appropriate switching and timing of the valve and rotor of the pump. The pump and associated method are directed to the precision dispensing of pharmaceutical fluids into containers, including containers held in container nests.

A peristaltic pump has an arcuate raceway wife a partially concave inner surface extending through an arc of at least one hundred eighty degrees (180°). The are defines a midpoint, and a rotor faces the inner surface of the raceway and is both rotatable relative to the raceway and transitionally 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 rotor motor is coupled to the rotor to rotate the rotor and rollers arranged on the rotor to contact tubing disposed between the rotor and the raceway when the rotor is in the pump position. A loading motor moves the rotor toward and away from the raceway.

The present disclosure provides a drug discharge assembly including a drive piece linearly reciprocated along one direction, a rotating unit being in contact with an end of the drive piece and rotating in one direction according to a linear reciprocating motion of the drive piece, a flexible tube disposed adjacent to the rotating unit and having a curved section at least partially extending in a circumferential direction, and a pressing unit mounted on the rotating unit and rotating while pressing the tube according to a rotation of the rotating unit, and a drug injection device comprising the same.

A peristaltic pump system is disclosed and can include a rigid backing and a rotor assembly comprising a central hub. The central hub can rotate along a central axis extending in an axial direction. The central hub can include one or more ball bearings or one or more rollers that are configured to rotate about a respective roller axis that intersects a central axis of the central hub. Located between the rigid backing and the rotor assembly can be tubing or a flow channel that is defined by the rigid backing and an elastomeric sheet. As the central hub rotates, the one or more rollers or ball bearings are configured to push against the tubing or the flow channel in the axial direction and can move along the tubing or the flow channel to move fluid through the tubing or the flow channel.