Hemofiltration system
AssigneeNxStage Medical, Inc.
InventorsJeffrey H. Burbank, Charles D. Finch, Jr., James M. Brugger
Life of this patent
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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.
Claims15
A method for-extracorporeal blood treatment, comprising the steps of:
- providing a blood treatment machine including at least one pump and a disposable filter;
- a fluid circuit including a blood withdrawal line, a blood return line, and a
- waste line being connected to said filter;
- a replacement fluid line connected to said tubing set to dilute blood carried in at least one of said blood return and blood withdrawal lines;
- connecting the patient's vascular system to the blood withdrawal and return lines;
- engaging a single member carrying said waste, replacement fluid, and blood withdrawal lines to a treatment machine;
- the member and treatment machine being configured such that by said step of engaging a single member, said at least one pump is enabled to pump fluid through said waste, withdrawal and return lines;
- withdrawing blood through a blood withdrawal line at a rate of at least 300 ml/mm passing the blood through a filter to remove waste;
- and
- passing the filtered blood through a blood return line and into the patient, wherein blood is withdrawn from and returned to the patient continuously for about 1.5 hours, and wherein the blood flow rate is at least 400 ml./min.
A method for hemofiltration, comprising the steps of:
- withdrawing blood through a blood withdrawal line at a rate of at least 300ml/min.;
- passing the blood through a filter to remove waste;
- and passing the filtered blood through a blood return line and into the patient, wherein blood is withdrawn from and returned to the patient continuously for about 1.5 hours, and wherein the blood flow rate is at least 400ml./min;
- pumping the withdrawn blood with a pump at a predetermined blood flow rate;
- measuring the actual blood flow rate delivered by the pump using a flow sensor;
- comparing the actual blood flow rate with a blood flow rate indicated by a pump speed;
- and
- activating an alarm responsively to a difference between the actual blood flow rate indicated by said flow sensor and the blood flow rate indicated by a pump speed such that said alarm is activated when said difference exceeds a predetermined value.
A method for-extracorporeal blood treatment, comprising the steps of:
- providing a blood treatment machine including at least one pump and a disposable filter;
- a fluid circuit including a blood withdrawal line, a blood return line, and a
- waste line being connected to said filter;
- a replacement fluid line connected to said tubing set to dilute blood carried in at least one of said blood return and blood withdrawal lines;
- connecting the patient's vascular system to the blood withdrawal and return lines;
- fastening a member carrying said waste, replacement fluid, and blood withdrawal lines to a treatment machine;
- the member and treatment machine being configured such that by said step of connecting, said waste, withdrawal, and return lines are engaged by, and actuated by, said pump;
- withdrawing blood through a blood withdrawal line at a rate of at least 300 ml/mm passing the blood through a filter to remove waste;
- and
- passing the filtered blood through a blood return line and into the patient, wherein blood is withdrawn from and returned to the patient continuously for about 1.5 hours, and wherein the blood flow rate is at least 400 ml./min.
Dependencies are inferred from the claim text.