This disclosure relates to medical fluid pumping systems and related devices and methods. In some aspects, a medical fluid pumping system includes a medical fluid pumping machine including a piston head that can be linearly displaced and a medical fluid cassette that can be secured to the medical fluid pumping machine. The medical fluid cassette includes a fastening member attached to a region of a flexible membrane overlying a fluid pump chamber, and the piston head is configured to be mechanically connected to the fastening member of the cassette.

A displacement sensing device is configured for a peritoneal dialysis system. The peritoneal dialysis system includes a housing and a syringe. The syringe is disposed on the housing and has a push rod. The displacement sensing device includes a guide rod, a probing module, and a resistance scale. The guide rod is coupled to the push rod, and the probing module is disposed in the housing and is fixed at the guide rod. The resistance scale is disposed at a side of the probing module. The probing module is configured to contact the resistance scale to obtain a resistance value of the resistance scale and determine a displacement magnitude of the push rod. In addition, a peritoneal dialysis system is also mentioned.

The present disclosure provides intravascular ventricular assist devices for insertion into the vasculature of an individual to improve the overall blood flow of the individual. In many embodiments, the intravascular ventricular assist devices described herein provide an individual with an intravascular ventricular assist device that is sized and configured for insertion into an aortic root or pulmonary root such that its reduced size and placement provide the individual with an improved quality of life. The intravascular ventricular assist devices described herein utilize a pump and optionally a prosthetic valve in combination with a self-expandable or balloon expandable stent or frame to allow placement within the aortic root or the pulmonary root such that a functioning valve works in combination with the pump to increase blood flow within the heart. Both intravascular left ventricular assist devices and intravascular right ventricular assist devices are within the scope of the present disclosure. Processes for implanting the intravascular ventricular assist devices are also disclosed herein.

Rotary lobe pump, comprising a pump housing (2, 9, 10) with a substantially cylindrical pump chamber (8) and a rotary lobe as rotor (1) with at least two blades (3) arranged opposite each other or evenly distributed in the circumferential direction and at least one sealing valve (4), characterized in that at least two sealing valves (4a, 4b) arranged opposite one another or uniformly distributed in the circumferential direction are provided, the at least two sealing valves (4a, 4b) being rotatable or pivotable, and an inlet duct (11) to at least two inlet openings (6) into the pump chamber (8) and an outlet duct (12) from at least two outlet openings (7) out of the pump chamber (8) being provided axially in a rotor axial tube (18), extending from the opposite axial ends and separated from one another.

Disclosed are example embodiments of a dialysis machine having a frame, a cartridge cassette, one or more alignment-locking features, and an actuation mechanism. The frame is fixedly coupled to the dialysis machine, and the cassette is slidably coupled to the frame. The cassette can have one or more track structures, with each of the one or more track structures having a rotor and one or more rollers. The one or more alignment-locking features extend from the frame and are configured to be inserted into one or more alignment features of a disposable cartridge that functions to secure or release the disposable cartridge. The actuation mechanism is made to slide the cassette with respect to the one or more track structures.

Disclosed are example embodiments of a dialysis machine having a frame, a cartridge cassette, one or more alignment-locking features, and an actuation mechanism. The frame is fixedly coupled to the dialysis machine, and the cassette is slidably coupled to the frame. The cassette can have one or more track structures, with each of the one or more track structures having a rotor and one or more rollers. The one or more alignment-locking features extend from the frame and are configured to be inserted into one or more alignment features of a disposable cartridge that functions to secure or release the disposable cartridge. The actuation mechanism is made to slide the cassette with respect to the one or more track structures.

A peristaltic pump for extracorporeal blood treatment includes a pump housing in which a rotor is rotatable about a rotor axis. The rotor has at least two squeeze elements offset in a circumferential direction to each other. The pump housing has a support surface extending arc-shaped about the rotor axis and spaced radially from the rotor. The support surface is configured to support a tube segment which is radially insertable between the rotor and the support surface. In order to extend the service life of the pump and reduce fluctuations in the pump volume, the pump has co-rotating guide surfaces arranged and configured adjacent to both sides of the squeeze element in the circumferential direction in such a way that they each form a circular segment-like guiding passage with the support surface, in which the tube segment can be fixed radially with a predetermined clearance fit.

A peristaltic pump for extracorporeal blood treatment includes a pump housing in which a rotor is rotatable about a rotor axis. The rotor has at least two squeeze elements offset in a circumferential direction to each other. The pump housing has a support surface extending arc-shaped about the rotor axis and spaced radially from the rotor. The support surface is configured to support a tube segment which is radially insertable between the rotor and the support surface. In order to extend the service life of the pump and reduce fluctuations in the pump volume, the pump has co-rotating guide surfaces arranged and configured adjacent to both sides of the squeeze element in the circumferential direction in such a way that they each form a circular segment-like guiding passage with the support surface, in which the tube segment can be fixed radially with a predetermined clearance fit.

A peristaltic pump, specifically for pumping fluid in an extracorporeal blood treatment apparatus, includes a pump housing that accommodates a rotor rotatable about a rotor axis and a squeeze element. The pump housing includes a support surface extending in a curved shape around the rotor axis and being radially spaced from the rotor. The support surface can support a tube segment that inserted radially between the rotor and support surface. The rotor supports the squeeze element via a rocker mounted on the rotor in a pivotable and cushioned manner. The rocker supports an insertion aid by which the tube segment can be pressed into the pump bed, and tube guide elements by which the tube segment is centrally alignable to the squeeze element. The rocker is made from high-strength stainless steel with high chemical resistance and manufactured by powder injection molding, such as metal injection molding.

A peristaltic pump, specifically for pumping fluid in an extracorporeal blood treatment apparatus, includes a pump housing that accommodates a rotor rotatable about a rotor axis and a squeeze element. The pump housing includes a support surface extending in a curved shape around the rotor axis and being radially spaced from the rotor. The support surface can support a tube segment that inserted radially between the rotor and support surface. The rotor supports the squeeze element via a rocker mounted on the rotor in a pivotable and cushioned manner. The rocker supports an insertion aid by which the tube segment can be pressed into the pump bed, and tube guide elements by which the tube segment is centrally alignable to the squeeze element. The rocker is made from high-strength stainless steel with high chemical resistance and manufactured by powder injection molding, such as metal injection molding.