High convection home hemodialysis/hemofiltration and sorbent system
First Claim
1. A medical fluid therapy system comprising:
- a blood line configured and arranged to be coupled to a patient;
a blood pump connected to the blood line;
a blood filter in communication with the blood line, the filter operable to allow a liquid portion of a patient'"'"'s blood to pass from the filter to a therapy fluid flow path;
a pair of peristaltic fluid pumps positioned and arranged to pump therapy fluid to one of the blood filter and the blood line and from the blood filter; and
at least one balance tube, including a tube and a separator mechanically free from first and second fluidly sealed closed ends of the balance tube, the separator fitted tightly and moveably back and forth between end-of-stroke positions within the tube for volumetric control that assumes a constant volume is maintained collectively between (i) the first closed end and the separator and (ii) the separator and the second closed end, regardless of an orientation of the balance tube, or tortuous path volume control device, the balance tube or tortuous path volume control device in fluid communication with the pair of peristaltic pumps and operable to control an amount of therapy fluid that is pumped to the blood filter or the blood line and an amount of the fluid that is pumped from the filter.
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Accused Products
Abstract
A system, method and apparatus for performing a renal replacement therapy is provided. In one embodiment, two small high flux dialyzers are connected in series. A restriction is placed between the two dialyzers in the dialysate flow path. The restriction is variable and adjustable in one preferred embodiment. The restriction builds a positive pressure in the venous dialyzer, causing a high degree of intentional backfiltration. That backfiltration causes a significant flow of dialysate through the high flux venous membrane directly into the patient'"'"'s blood. That backfiltered solution is subsequently ultrafiltered from the patient from the arterial dialyzer. The diffusion of dialysate into the venous filter and removal of dialysate from the arterial dialyzer causes a convective transport of toxins from the patient. Additionally, the dialysate that does not diffuse directly into the patient but instead flows across the membranes of both dialyzers provides a diffusive clearance of waste products.
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Citations
17 Claims
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1. A medical fluid therapy system comprising:
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a blood line configured and arranged to be coupled to a patient; a blood pump connected to the blood line; a blood filter in communication with the blood line, the filter operable to allow a liquid portion of a patient'"'"'s blood to pass from the filter to a therapy fluid flow path; a pair of peristaltic fluid pumps positioned and arranged to pump therapy fluid to one of the blood filter and the blood line and from the blood filter; and at least one balance tube, including a tube and a separator mechanically free from first and second fluidly sealed closed ends of the balance tube, the separator fitted tightly and moveably back and forth between end-of-stroke positions within the tube for volumetric control that assumes a constant volume is maintained collectively between (i) the first closed end and the separator and (ii) the separator and the second closed end, regardless of an orientation of the balance tube, or tortuous path volume control device, the balance tube or tortuous path volume control device in fluid communication with the pair of peristaltic pumps and operable to control an amount of therapy fluid that is pumped to the blood filter or the blood line and an amount of the fluid that is pumped from the filter. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A dialysis system comprising:
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a dialysis instrument including first and second dialysate pump actuators; and a disposable cassette operable with the dialysis instrument, the disposable cassette including first and second portions configured to operate respectively with the first and second dialysate pump actuators, the disposable cassette further including at least one balance tube configured to meter an amount of fresh dialysate delivered to and an amount of spent dialysate removed from a patient, the balance tube defining a longitudinal axis and including a separator within the tube, the separator mechanically free from first and second fluidly sealed closed ends of the balance tube and to move back and forth along the longitudinal axis within the tube to meter the dialysate to and from the patient. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification