Dialysis systems are disclosed comprising new fluid flow circuits. Systems may include blood and dialysate flow paths, where the dialysate flow path includes balancing, mixing, and/or directing circuits. Dialysate preparation may be decoupled from patient dialysis. Circuits may be defined within one or more cassettes. The fluid circuit fluid flow paths may be isolated from electrical components. A gas supply in fluid communication with the dialysate flow path and/or the dialyzer able to urge dialysate through the dialyzer and urge blood back to the patient may be included for certain emergency situations. Fluid handling devices, such as pumps, valves, and mixers that can be actuated using a control fluid may be included. Control fluid may be delivered by an external pump or other device, which may be detachable and/or generally rigid, optionally with a diaphragm dividing the device into first and second compartments.

Dialysis systems are disclosed comprising new fluid flow circuits. Systems may include blood and dialysate flow paths, where the dialysate flow path includes balancing, mixing, and/or directing circuits. Dialysate preparation may be decoupled from patient dialysis. Circuits may be defined within one or more cassettes. The fluid circuit fluid flow paths may be isolated from electrical components. A gas supply in fluid communication with the dialysate flow path and/or the dialyzer able to urge dialysate through the dialyzer and urge blood back to the patient may be included for certain emergency situations. Fluid handling devices, such as pumps, valves, and mixers that can be actuated using a control fluid may be included. Control fluid may be delivered by an external pump or other device, which may be detachable and/or generally rigid, optionally with a diaphragm dividing the device into first and second compartments.

A pump-valving assembly for a pulsatile fluid pump includes a pumping chamber, an inlet port, and an outlet port. The pump-valving assembly further includes an inlet ball check-valve assembly, first and second tapered tracts disposed between the inlet port and the pumping chamber, an outlet ball check-valve assembly, and third and fourth tapered tracts disposed between the pumping chamber and outlet port. The first tapered tract expands in cross sectional area from the inlet port to the inlet ball check valve assembly, and the second tapered tract decreases in cross sectional area from the inlet ball check valve assembly to the chamber. The third tapered tract expands in cross sectional area from the chamber to the outlet ball check valve assembly and the fourth tapered tract decreases in cross sectional area from the outlet ball check valve assembly to the outlet port.

A medical fluid pumping system includes a medical fluid pump for pumping a process fluid, the medical fluid pump including a first pump chamber, a first inlet valve chamber including a first inlet valve diaphragm, a first outlet valve chamber, a second pump chamber, a second inlet valve chamber including a second inlet valve diaphragm, and a second outlet valve chamber; and a medical fluid chassis operable with the medical fluid pump, the medical fluid chassis including a motive fluid source providing motive fluid at a motive fluid pressure, and wherein the first and second inlet valve diaphragms are configured to actuate from an open to a closed position at a pressure less than the motive fluid pressure to mitigate process fluid backflow through the first and second inlet valves.

A pump cassette is disclosed. The pump cassette includes a housing having at least one fluid inlet line and at least one fluid outlet line. The cassette also includes at least one reciprocating pressure displacement membrane pump within the housing. The pressure pump pumps a fluid from the fluid inlet line to the fluid outlet line. A hollow spike is also included on the housing as well as at least one metering pump. The metering pump is fluidly connected to the hollow spike on the housing and to a metering pump fluid line. The metering pump fluid line is fluidly connected to the fluid outlet line.

Disclosed is a cannula (CA1 to CA7) for endovascular and/or jugular blood circuit support, comprising: —a proximal portion (PP1 to PP6), —a distal portion (DP1 to DP7) that comprises at least one distal opening (DO1 to DO7), —a lumen portion (LP) that extends from the proximal portion (PP1 to PP6) to the at least one distal opening (DO1 to DO7), and—at least one intermediate portion (IP1 to IP7) that is arranged between the proximal portion (PP1 to PP6) and the distal portion (DP1 to DP7), wherein the intermediate portion (IP1 to IP7) comprises at least one intermediate opening (IO1 to IO7), and wherein the intermediate portion (IP1 to IP7) is configured such that more than 90 volume percent of the fluid flow are drained from the intermediate opening (IO1 to IO7) if a fluid flow within the proximal portion (PP1 to PP6) is directed proximally and such that more than 90 volume percent of the fluid flow are delivered through the at least one distal opening (DO1 to DO7) if a fluid flow within the proximal portion (PP1 to PP6) is directed distally.

Disclosed is a cannula (CA1 to CA7) for endovascular and/or jugular blood circuit support, comprising: —a proximal portion (PP1 to PP6), —a distal portion (DP1 to DP7) that comprises at least one distal opening (DO1 to DO7), —a lumen portion (LP) that extends from the proximal portion (PP1 to PP6) to the at least one distal opening (DO1 to DO7), and—at least one intermediate portion (IP1 to IP7) that is arranged between the proximal portion (PP1 to PP6) and the distal portion (DP1 to DP7), wherein the intermediate portion (IP1 to IP7) comprises at least one intermediate opening (IO1 to IO7), and wherein the intermediate portion (IP1 to IP7) is configured such that more than 90 volume percent of the fluid flow are drained from the intermediate opening (IO1 to IO7) if a fluid flow within the proximal portion (PP1 to PP6) is directed proximally and such that more than 90 volume percent of the fluid flow are delivered through the at least one distal opening (DO1 to DO7) if a fluid flow within the proximal portion (PP1 to PP6) is directed distally.

An arrangement (200 to 1200) is provided for transporting a liquid (B) through a cannula system (CS), comprising: a liquid guiding system (LGS) comprising at least three separated portions (SP2a, SP2b, SP3c) which define separate liquid guiding portions of the liquid guiding system (LGS), and a connecting portion (CP2 to CP12) which fluidically connects the at least three separated portions (SP2a, SP2b, SP3c) and which comprises a lumen that branches out into at least two lumens, wherein the liquid guiding system (LGS) is configured to be connected to a pump arrangement (Arr2 to An12) which drives a flow of the liquid (B), and wherein the liquid guiding system (LGS) is configured to be connected to a cannula system (CS) which is adapted to be inserted into a body of a human or of an animal and which comprises an inflow opening and an outflow opening of the liquid guiding system (LGS).

An arrangement (200 to 1200) is provided for transporting a liquid (B) through a cannula system (CS), comprising: a liquid guiding system (LGS) comprising at least three separated portions (SP2a, SP2b, SP3c) which define separate liquid guiding portions of the liquid guiding system (LGS), and a connecting portion (CP2 to CP12) which fluidically connects the at least three separated portions (SP2a, SP2b, SP3c) and which comprises a lumen that branches out into at least two lumens, wherein the liquid guiding system (LGS) is configured to be connected to a pump arrangement (Arr2 to An12) which drives a flow of the liquid (B), and wherein the liquid guiding system (LGS) is configured to be connected to a cannula system (CS) which is adapted to be inserted into a body of a human or of an animal and which comprises an inflow opening and an outflow opening of the liquid guiding system (LGS).

A blood treatment system includes (i) a blood pump including a first blood pump chamber operable with a first inlet valve and a first outlet valve, and a second blood pump chamber operable with a second inlet valve and a second outlet valve; (ii) an arterial blood line; (iii) a dialyzer placed in fluid communication with the arterial blood line, wherein the blood pump is provided along the arterial blood line upstream of the dialyzer; and (iv) a venous blood line extending downstream from the dialyzer. The system also includes a processor configured to sequence the first and second blood pump chambers so as to achieve a pulsatile pattern of filling the first and second blood pump chambers and an at least substantially constant pattern of discharging blood from the first and second blood pump chambers to the dialyzer.