Hemodialysis system

Patent metadata

Field	Value
Publication number	US-2024123132-A1
Application number	US-202318394189-A
Country	US
Kind code	A1
Filing date	Dec 22, 2023
Priority date	May 24, 2011
Publication date	Apr 18, 2024
Grant date	—

Abstract

A drain cassette for a dialysis unit has a fluid channel between venous and arterial connection ports, and a valve may controllably open and close fluid communication between a drain outlet port and the venous connection port or the arterial connection port. A blood circuit assembly and drain cassette may be removable from the dialysis unit, e.g., by hand and without the use of tools. A blood circuit assembly may include a single, unitary member that defines portions of a pair of blood pumps, control valves, channels to accurately position flexible tubing for an occluder, an air trap support, and/or other portions of the assembly. A blood circuit assembly engagement device may assist with retaining a blood circuit assembly on the dialysis unit, and/or with removal of the assembly. An actuator may operate a retainer element and an ejector element that interact with the assembly.

First claim

What is claimed is:

1 - 82 . (canceled)

83 . A hemodialysis system comprising:
a dialysis unit configured to perform hemodialysis, the dialysis unit comprising: a dialyzer; a pneumatically driven blood pump configured to pump blood through the dialyzer; and a balancing circuit including a pneumatically driven dialysate pump to control a flow of dialysate through the dialyzer, wherein flow of blood and dialysate through the dialysis unit is controlled by a plurality of pneumatically actuated valves; a power unit configured to provide pneumatic power for actuating the blood pump, dialysate pump and the plurality of valves, the power unit comprising: a housing; a first positive pressure tank; a negative pressure tank; a compressor fluidly connected to the first positive pressure tank; and a dehumidifier downstream of the compressor, the dehumidifier comprising: a metal tube fluidly connected to the compressor; a chiller that cools the metal tube; and a water trap fluidly connected to the metal tube downstream of the compressor and upstream of the first positive pressure tank; wherein the pressure tanks reside in the housing and the housing is detachably connected to the dialysis unit, the power unit having a power conduit and at least two pneumatic lines configured to connect to the dialysis unit.

84 . The hemodialysis system of claim 83 , wherein the power unit further comprises:
a vacuum pump fluidly connected to the negative pressure tank.

85 . The hemodialysis system of claim 84 , wherein the power unit further comprises:
a first control system to control the compressor to achieve a predetermined first positive pressure in the first positive pressure tank; and a second control system to control the vacuum pump to achieve a predetermined negative pressure in the negative pressure tank.

86 . The hemodialysis system of claim 85 , wherein the power unit further comprises:
a positive pressure regulator fluidly connected to the first positive pressure tank, the positive pressure regulator set to a second positive pressure, the second positive pressure less than the first positive pressure; and a second positive pressure tank fluidly connected to the first positive pressure tank via the positive pressure regulator; wherein the power unit has at least three pneumatic lines configured to connect to the dialysis unit.

87 . The hemodialysis system of claim 83 , wherein the chiller comprises a Peltier cooler, a finned heat exchanger and a fan.

88 . The hemodialysis system of claim 85 , wherein the first positive pressure is in the range of 1000-1100 mmHg pressure.

89 . The hemodialysis system of claim 85 , wherein the first positive pressure is in the range of 700 to 850 mmHg.

90 . The hemodialysis system of claim 85 , wherein the negative pressure is −400 to −450 mmHg.

91 . The hemodialysis system of claim 86 , wherein the first positive pressure is in the range of 1000-1100 mmHg pressure and the second positive pressure is the range of 700-850 mmHg.

92 . The hemodialysis system of claim 85 , wherein the first control system comprises a pressure sensor fluidly connected to the first positive pressure tank and a relay to control the compressor, the first control system controlling a pressure in the first positive pressure tank.

93 . The hemodialysis system of claim 92 , wherein the first control system turns the compressor on when a pressure measured by the pressure sensor is a predetermined value below the first positive pressure and turns the compressor off when a pressure measured by the pressure sensor is a predetermined value above the first positive pressure.

94 . The hemodialysis system of claim 92 , wherein the first control system drives the compressor with a pulse-width-modulated signal and controls the compressor with a proportional-integral-derivative controller.

95 . The hemodialysis system of claim 83 , wherein the housing is detachably connected to the dialysis unit by operation of a single handle.

96 . The system of claim 95 , wherein the handle is a manually operable connection handle.

97 . A hemodialysis system comprising:
a dialysis unit configured to perform hemodialysis, the dialysis unit comprising: a dialyzer; a pneumatically driven blood pump configured to pump blood through the dialyzer; and a balancing circuit including a pneumatically driven dialysate pump to control the flow of dialysate through the dialyzer, wherein the flow of blood and dialysate through the dialysis unit is controlled by a plurality of pneumatically actuated valves; a power unit configured to provide pneumatic power for actuating the blood pump, dialysis pump and the plurality of valves, the power unit comprising: a housing; a compressor; a first positive pressure tank; and a dehumidifier fluidly connected between the compressor and the first positive pressure tank, the dehumidifier comprising: a metal tube fluidly connected to the compressor; a chiller that cools the metal tube; and a water trap fluidly connected to the metal tube downstream of the compressor and upstream of the first positive pressure tank; wherein the first positive pressure tank, compressor and dehumidifier reside in the housing and the housing is detachably connected to the dialysis unit, the power unit has a power conduit and at least two pneumatic lines configured to connect to the dialysis unit.

98 . The hemodialysis system of claim 97 , wherein the chiller comprises a Peltier cooler, a finned heat exchanger and a fan.

99 . The hemodialysis system of claim 97 , further comprising:
a negative pressure tank; and a vacuum pump fluidly connected to the negative pressure tank.

100 . The hemodialysis system of claim 97 , wherein the power unit further comprises:
a positive pressure regulator fluidly connected to the first positive pressure tank, the first positive pressure tank characterized by a first positive pressure, and the positive pressure regulator set to a second positive pressure, the second positive pressure less than the first positive pressure; and a second positive pressure tank fluidly connected to the first positive pressure tank via the positive pressure regulator; wherein the power unit has at least three pneumatic lines configured to connect to the dialysis unit.

101 . The hemodialysis system of claim 97 , wherein the housing is detachably connected to the dialysis unit by operation of a single handle.

102 . The hemodialysis system of claim 101 , wherein the handle is a manually operable connection handle.

Assignees

• Deka Products Lp

Inventors

• Grant Kevin L
• Wilt Michael J
• Tracey Brian D
• Rudolf Brett A
• Collins David E
• Gustin Lisa A
• Dale James D
• Bodwell Jesse T

Classifications

• A61M1/3653 Primary

  Interfaces between patient blood circulation and extra-corporal blood circuit · CPC title

• A61M1/14

  Dialysis systems; Artificial kidneys; Blood oxygenators (semi-permeable membranes characterised by the material, manufacturing processes therefor B01D71/00){; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis} · CPC title

• A61M1/1658

  Degasification · CPC title

• A61M1/1682

  both machine and membrane module, i.e. also the module blood side · CPC title

• A61M1/1686

  by heat · CPC title