Multimodal dialysis system
First Claim
1. A multimodal dialysis apparatus, comprising:
- a blood circuit for transporting blood extracorporeally to a hemodialysis unit;
a dialysate circuit for transporting a fluid to contact the hemodialysis unit, wherein the fluid increases in concentration with at least one waste species during operation;
an infusate pump for adding a potassium salt to the fluid in the dialysate circuit; and
a composition sensor comprising a potassium-sensitive electrode for measuring a potassium ion concentration in one or more of blood in the blood circuit and fluid in the dialysate circuit,a purification unit comprising an electrodialysis unit having a diluate chamber and a concentrate chamber and a means for producing an electric field, wherein one or more ions are removed from the fluid in the dialysate circuit;
a reverse osmosis unit located at an outlet of the purification unit to selectively remove solutes from the fluid;
a conditioning unit comprising urease;
wherein the conditioning unit is located at an outlet of the reverse osmosis unit; and
a conduit connecting an outlet of the conditioning unit to an inlet of the electrodialysis unit for returning fluid exiting the conditioning unit to the electrodialysis unit;
wherein the infusate pump is controlled by a controller to adjust a rate of addition of potassium ions to the fluid in the dialysate circuit based at least in part on data from the composition sensor.
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Accused Products
Abstract
A dialysis device for operation in multiple modes and for maintaining a known gradient of potassium ion or other electrolyte between the blood of a patient and a dialysate fluid is described. The dialysis device is capable of being used for hemodialysis or peritoneal dialysis, and the dialysis device is capable of operation with a dialysate purification unit outside of a clinical setting or with a supply of water that can be supplied in a clinical setting. The dialysis device has a composition sensor containing a potassium-sensitive electrode for measuring a potassium ion concentration in one or more of the patient'"'"'s blood and the dialysate fluid and an infusate pump operated to adjust a potassium ion concentration in the dialysate fluid based at least in part on data from the composition sensor.
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Citations
16 Claims
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1. A multimodal dialysis apparatus, comprising:
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a blood circuit for transporting blood extracorporeally to a hemodialysis unit; a dialysate circuit for transporting a fluid to contact the hemodialysis unit, wherein the fluid increases in concentration with at least one waste species during operation; an infusate pump for adding a potassium salt to the fluid in the dialysate circuit; and a composition sensor comprising a potassium-sensitive electrode for measuring a potassium ion concentration in one or more of blood in the blood circuit and fluid in the dialysate circuit, a purification unit comprising an electrodialysis unit having a diluate chamber and a concentrate chamber and a means for producing an electric field, wherein one or more ions are removed from the fluid in the dialysate circuit; a reverse osmosis unit located at an outlet of the purification unit to selectively remove solutes from the fluid; a conditioning unit comprising urease;
wherein the conditioning unit is located at an outlet of the reverse osmosis unit; and
a conduit connecting an outlet of the conditioning unit to an inlet of the electrodialysis unit for returning fluid exiting the conditioning unit to the electrodialysis unit;wherein the infusate pump is controlled by a controller to adjust a rate of addition of potassium ions to the fluid in the dialysate circuit based at least in part on data from the composition sensor. - View Dependent Claims (2, 3, 4)
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5. A multimodal dialysis apparatus, comprising:
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a dialysate circuit for conveying fluid to and from the peritoneal cavity of a patient; an infusion pump for adding a potassium salt to the fluid in the dialysate circuit; and a composition sensor comprising a potassium-sensitive electrode for measuring a potassium ion concentration in the fluid in the dialysate circuit, a purification unit comprising an electrodialysis unit having a diluate chamber and a concentrate chamber and a means for producing an electric field, wherein one or more ions are removed from the fluid in the dialysate circuit; a reverse osmosis unit located at an outlet of the purification unit to selectively remove solutes from the fluid; a conditioning unit having urease;
wherein the conditioning unit is located at an outlet of the reverse osmosis unit, and a conduit connecting an outlet of the conditioning unit to an inlet of the electrodialysis unit for returning fluid exiting the conditioning unit to the electrodialysis unit;wherein the infusate pump is controlled by a controller to adjust a rate of addition of potassium ions to the fluid in the dialysate circuit based at least in part on data from the composition sensor. - View Dependent Claims (6, 7, 8)
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9. A method for performing dialysis, comprising:
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contacting a dialysate fluid to a patient or to a medical device such that at least one waste species is transferred from the patient to the dialysate fluid; measuring a potassium ion concentration of the contacted dialysate fluid; conveying the dialysate fluid to an electrodialysis unit, wherein one or more ions are removed from the dialysate fluid; conveying the dialysate fluid to a reverse osmosis unit to selectively remove solutes from the dialysate fluid; conveying the contacted dialysate fluid from the electrodialysis unit to a conditioning unit comprising urease; and
conveying the contacted dialysate fluid from the conditioning unit back to the electrodialysis unit; andcontrolling a rate of addition of potassium ions to a dialysate fluid being conveyed to the patient or to the medical device based upon the measured potassium ion concentration in the contacted dialysate fluid. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification