HEMOFILTRATION SYSTEM
First Claim
1. A method of clearing a patient'"'"'s blood of uremic toxins, comprising:
- subjecting a patient in need of renal therapy to a protocol involving continuously removing blood from a patient at a blood flow rate of at least 300 ml/min, at least partially clearing the blood of uremic toxins to create cleared blood, and continuously returning the cleared blood to the patient; and
repeating the protocol at least 4 times in one week.
2 Assignments
0 Petitions
Accused Products
Abstract
A hemofiltration system and method is provided that allows for high flow rate, accurate determination of net fluid withdrawal from or addition to a patient, and simple and reliable home operation. A removable, disposable assembly includes a filter housing and pump member including one or more fluid conduits mounted against the pump member. When the disposable filter/pump member assembly is attached to the treatment system, a pump roller mechanism associated with the system actuates the conduits mounted against the pump member. A disposable waste receptacle and fluid replacement (infusate) reservoir can be provided as an integral part of the disposable filter/pump member assembly.
148 Citations
100 Claims
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1. A method of clearing a patient'"'"'s blood of uremic toxins, comprising:
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subjecting a patient in need of renal therapy to a protocol involving continuously removing blood from a patient at a blood flow rate of at least 300 ml/min, at least partially clearing the blood of uremic toxins to create cleared blood, and continuously returning the cleared blood to the patient; and
repeating the protocol at least 4 times in one week. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94)
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- 13. A method comprising clearing a patient'"'"'s blood of uremic toxins via hemofiltration at an effective clearance rate of at least 100 ml/min
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20. A method comprising:
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subjecting a patient in need of renal therapy to a protocol involving allowing uremic toxins in the patient'"'"'s blood to reach no more than about 80% of the maximum level compared to thrice-weekly therapy levels, treating the patient'"'"'s blood to reduce uremic toxins in the blood to a level no less than about 20% of the maximum level compared to thrice-weekly therapy levels; and
repeating the protocol at least 4 times in one week. - View Dependent Claims (21, 22, 23, 24, 25, 97)
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26. A self-contained system for clearing a patient'"'"'s blood of uremic toxins, comprising:
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a filter having a first side fluidly connectable to a source of a patient'"'"'s blood and a second side fluidly connectable to a waste receptacle; and
a reservoir containing from about 4 to about 25 liters of infusate fluidly connectable to the patient'"'"'s blood stream. - View Dependent Claims (27, 28, 29, 30, 98, 99)
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31. A system for clearing a patient'"'"'s blood of uremic toxins, comprising:
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a filter having a first side and a second side;
an input conduit in fluid communication with the first side of the filter and fluidly connectable to a patient'"'"'s blood stream;
a return conduit in fluid communication with the first side of the filter for returning cleared blood to the patient'"'"'s blood stream;
a waste receptacle;
a waste conduit fluidly connecting the waste receptacle to the second side of the filter;
a reservoir containing from about 4 to about 25 liters of infusate; and
an infusate conduit fluidly connecting the reservoir to the return conduit. - View Dependent Claims (32, 33, 34, 39, 100)
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35. A system comprising:
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a peristaltic pump;
a fluid conduit passing through the pump and having a portion upstream of the pump; and
a valve in the portion of the fluid conduit upstream of the pump. - View Dependent Claims (36, 37, 38)
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40. A method comprising:
adjusting the rate of fluid flow through a peristaltic pump by adjusting the resistance to fluid flow upstream of the pump. - View Dependent Claims (41, 42)
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43. A method comprising:
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establishing a flow of fluid through a peristaltic pump from a source of the fluid; and
changing the rate of flow of the fluid through the peristaltic pump while the pump operates at a constant speed and the source of fluid remains constant. - View Dependent Claims (44, 45, 46)
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47. A method comprising:
controlling an amount of a replacement fluid added from a reservoir to a blood stream of a patient in response to a signal generated from comparison of (a) a total amount of an accumulated waste product removed from the blood stream and the replacement fluid in the reservoir with (b) one of the amount of the accumulated waste product and the replacement fluid in the reservoir. - View Dependent Claims (48)
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49. A system comprising:
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a blood treatment device having an input fluidly connectable to a source of blood drawn from a patient in need of renal treatment and an output fluidly connectable to a receptacle of blood waste product;
a first scale adapted to determine a first value that is a total amount of the content of the receptacle of blood waste product plus an amount of blood replacement fluid in a reservoir;
a second scale adapted to determine a second value that is at least one of the content of the receptacle of blood waste product and the amount of blood replacement fluid in the reservoir;
a microprocessor capable of generating a signal indicative of a comparison of the first value and the second value; and
a controller capable of controlling delivery of blood replacement fluid to the patient'"'"'s blood stream in response to the signal. - View Dependent Claims (50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63)
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64. A system comprising:
a peristaltic pump including a fluid conduit and a rotatable actuator that urges fluid flow within the conduits upon rotation, the first conduit connected to a source of physiological fluid. - View Dependent Claims (65)
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66. A method comprising:
urging simultaneously the flow of first and second physiological fluids within first and second conduits, respectively, via actuation of a single fluid pump actuator. - View Dependent Claims (67)
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68. A fluid pump constructed and arranged for use with a blood treatment system, the treatment system including a blood treatment device, a withdrawal conduit arranged to supply a source of blood from a patient in need of renal treatment to the treatment device, a return conduit arranged to return treated blood from the treatment device to the patient, a waste product conduit arranged to deliver waste product removed from the blood by the treatment device to a waste outlet, and a replacement fluid conduit arranged to deliver a replacement fluid to the patient,
wherein the fluid pump is constructed and arranged to urge fluid to flow within at least two of the withdrawal conduit, the return conduit, the waste product conduit, and the replacement fluid conduit.
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72. An assembly for use with a blood treatment system that is removably attachable to the system, comprising:
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a blood filter housing having an inlet and a first outlet and a second outlet;
a pump member having a surface that mates with a pump in the treatment system when the assembly is attached to the treatment system;
a withdrawal conduit in fluid communication with the filter housing inlet and fluidly connectable to a source of blood from a patient in need of renal treatment;
a return conduit in fluid communication with the first filter housing outlet and fluidly connectable to a conduit for returning treated blood to the patient; and
a waste product conduit in fluid communication with the second filter housing outlet, at least two of the withdrawal conduit, the return conduit, and the waste product conduit being arranged proximate the pump member surface such that, when the assembly is attached to the treatment system, the at least two conduits are actuable by the pump. - View Dependent Claims (73, 74, 75, 76, 77, 78, 79)
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80. A system comprising:
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a conduit fluidly connectable to a patient'"'"'s vascular system; and
an ultrasonic sensor responsive to fluid flow in the conduit and including an output for delivering a signal indicative of fluid flow rate in the conduit. - View Dependent Claims (81, 82)
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83. A system for clearing a patient'"'"'s blood of uremic toxins, comprising:
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a subcutaneous port providing fluid communication with a patient'"'"'s vascular system;
a filter having a first side and a second side;
an input conduit in fluid communication with the first side of the filter and fluidly connectable to the subcutaneous port;
a return conduit in fluid communication with the first side of the filter for returning cleared blood to the patient'"'"'s blood stream;
a waste receptacle;
a waste conduit fluidly connecting the waste receptacle to the second side of the filter;
a reservoir containing from about 4 to about 25 liters of infusate; and
an infusate conduit fluidly connecting the reservoir to the return conduit, wherein the system is constructed and arranged to continuously clear the blood of uremic toxins to create cleared blood at a blood flow rate of at least 300 ml/min.
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Specification