A tube is for use in a pump that transports a fluid by peristaltic movement and includes: a flow path that serves as a transport path of the fluid and extends in a first direction; and a body portion formed around the flow path, the body portion includes a first layer formed on the flow path and a second layer formed on the first layer, a flexural modulus of elasticity in a radial direction of the second layer is smaller than a flexural modulus of elasticity in a radial direction of the first layer, and the elastic modulus ratio R2 of the second layer is larger than the elastic modulus ratio R1 of the first layer.

A pump includes a conduit defining an inner volume and formed from a flexible material, the conduit movable between an expanded state and a relaxed state. A coil is disposed within the conduit and includes an outer diameter that is approximately equal to an inner diameter of the conduit, the coil substantially maintaining its outer diameter when the conduit is moved between the relaxed state and the expanded state. A manifold is in fluid communication with the inner volume and is operable to permit fluid to enter the inner volume in a first mode and expel fluid from the inner volume in a second mode.

A pump includes a conduit defining an inner volume and formed from a flexible material, the conduit movable between an expanded state and a relaxed state. A coil is disposed within the conduit and includes an outer diameter that is approximately equal to an inner diameter of the conduit, the coil substantially maintaining its outer diameter when the conduit is moved between the relaxed state and the expanded state. A manifold is in fluid communication with the inner volume and is operable to permit fluid to enter the inner volume in a first mode and expel fluid from the inner volume in a second mode.

Tube roller pumps for blood treatment devices are disclosed. The pumps include a curved surface with a rotor rotatable therein. The rotor attaches via a shaft reception to a drive shaft of the pump. The rotor has a first locking element for axially locking the rotor on the shaft and a second locking element for rotationally coupling the shaft and the rotor. The shaft reception and the drive shaft guide the rotor to a position on the shaft, when pushed onto the shaft, and, at this position, the first element may be moved by the shaft from locked to released. The rotor, when pushed further onto the shaft, is moved to another position at which the first element is automatically moved back to locked and the second element may be brought into manual engagement with the shaft to transmit torque from the shaft to the rotor.

Tube roller pumps for blood treatment devices are disclosed. The pumps include a curved surface with a rotor rotatable therein. The rotor attaches via a shaft reception to a drive shaft of the pump. The rotor has a first locking element for axially locking the rotor on the shaft and a second locking element for rotationally coupling the shaft and the rotor. The shaft reception and the drive shaft guide the rotor to a position on the shaft, when pushed onto the shaft, and, at this position, the first element may be moved by the shaft from locked to released. The rotor, when pushed further onto the shaft, is moved to another position at which the first element is automatically moved back to locked and the second element may be brought into manual engagement with the shaft to transmit torque from the shaft to the rotor.

Provided is a pump for supplying a liquid. The pump includes: a tube including a pump chamber communicating with a chemical liquid inlet and a chemical liquid outlet, and configured to discharge a chemical liquid through a change in volume due to contraction and expansion; and a driving unit contracting or expanding the tube in a longitudinal direction, in which the tube includes: a flexible tube body including a pump chamber which has an increased internal volume when is contracted in a longitudinal direction and has a decreased internal volume when is expanded in the longitudinal direction, and which has a jar shape of which a radius is increased from the chemical liquid inlet to a center of the pump chamber, and the radius is decreased from the pump chamber to the chemical liquid outlet; a first flange provided at one end of the tube body and including the chemical liquid inlet; and a second flange provided at the other end of the tube body and including the chemical liquid outlet.

Provided is a pump for supplying a liquid. The pump includes: a tube including a pump chamber communicating with a chemical liquid inlet and a chemical liquid outlet, and configured to discharge a chemical liquid through a change in volume due to contraction and expansion; and a driving unit contracting or expanding the tube in a longitudinal direction, in which the tube includes: a flexible tube body including a pump chamber which has an increased internal volume when is contracted in a longitudinal direction and has a decreased internal volume when is expanded in the longitudinal direction, and which has a jar shape of which a radius is increased from the chemical liquid inlet to a center of the pump chamber, and the radius is decreased from the pump chamber to the chemical liquid outlet; a first flange provided at one end of the tube body and including the chemical liquid inlet; and a second flange provided at the other end of the tube body and including the chemical liquid outlet.

A liquid supplying device includes: a first pump and a second pump respectively provided in a liquid supplying path that supplies liquid contained in a liquid accommodating portion to an applicator; a filter passing through the liquid that flows toward the applicator; and a return flow path that returns the liquid passing through the filter to the liquid accommodating portion. In a circulating mode that supplies the liquid to the return flow path and stops supply of the liquid to the applicator, any of the first pump and the second pump continuously supplies the liquid to the return flow path.

A liquid supplying device includes: a first pump and a second pump respectively provided in a liquid supplying path that supplies liquid contained in a liquid accommodating portion to an applicator; a filter passing through the liquid that flows toward the applicator; and a return flow path that returns the liquid passing through the filter to the liquid accommodating portion. In a circulating mode that supplies the liquid to the return flow path and stops supply of the liquid to the applicator, any of the first pump and the second pump continuously supplies the liquid to the return flow path.

Various fluid delivery systems are described comprising an infusion pump having a housing with a first opening and a hollow interior portion that is configured to receive a cartridge having a tubing. A pump unit can be disposed within the housing. The pump unit comprises a motor mechanically coupled with a crank shaft or eccentric cam that is configured to move a set of pistons or other objects to thereby compress one or more portions of the tubing over time as the crank shaft or eccentric cam rotates.