US4756838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of dry dialysate products
Assignee: Individual
•
Filing: 1980-10-02
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Granted: 1988-07-12
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Expires: 2000-10-02
Abstract
Abstract This invention is directed to dry, free-flowing, stable readily soluble, non-caking, particulate solid products which are readily soluble in water and which are useful for preparing solutions for use in hemodialysis and peritoneal dialysis and to the preparation of these granular products.
Inventors
- 👤 Preston L. Veltman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:35
CPC Classifications
A; A61; A61M; A61M1/00; A61M1/14; A61M1/16; A61M1/1654; A61M1/1656; A61M1/1666; A61M1/1668; A61M1/167; A61M1/28; A61M1/287
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
129 words
A process for preparing a dry, free-flowing granular first composition suitable for preparing a hemodialysis solution and a peritoneal dialysis solution, said process comprising: (a) forming a dry granular second composition by dissolving salts consisting essentially of a major amount of sodium chloride and a minor amount of magnesium chloride and calcium chloride in water to form a process solution, rapidly vaporizing the water therefrom in the presence of finely divided recycled particles of the second composition to form a chemically homogeneous solid material consisting essentially of an intimate admixture of said salts and crushing the solid material to form the dry granular second composition and particles for recycling; and (b) mixing the granular second composition with finely divided anhydrous sodium bicarbonate to form said free-flowing granular first composition.
Claim 2
Dependent Claim
129 words
A process for preparing a dry, free-flowing granular first composition suitable for preparing a hemodialysis solution and a peritoneal dialysis solution, said process comprising: (a) forming a dry granular second composition by dissolving salts consisting essentially of a major amount of sodium chloride and a minor amount of magnesium chloride and calcium chloride in water to form a process solution, rapidly vaporizing the water therefrom in the presence of finely divided recycled particles of the second composition to form a chemically homogeneous solid material consisting essentially of an intimate admixture of said salts and crushing the solid material to form the dry granular second composition and particles for recycling; and (b) mixing the granular second composition with finely divided anhydrous sodium bicarbonate to form said free-flowing granular first composition.
Claim 3
Dependent Claim
133 words
A process for preparing a dry, free-flowing, granular first composition suitable for preparing a hemodialysis solution and a peritoneal dialysis solution, said process comprising: (a) forming a granular second composition by dispersing comminuted salts consisting essentially of a major amount of sodium chloride and a minor amount of magnesium chloride and calcium chloride in an amount of water insufficient to dissolve all of said sodium chloride, rapidly vaporizing the water from the dispersion in the presence of recycled particulate second composition to form a chemically homogeneous solid material consisting essentially of an intimate admixture of said salts and crushing said solid material to form the granular second composition and particles for recycle; and (b) mixing the granular second composition with finely divided anhydrous sodium bicarbonate to form said dry, free-flowing granular first composition.
Claim 4
Dependent Claim
133 words
A process for preparing a dry, free-flowing, granular first composition suitable for preparing a hemodialysis solution and a peritoneal dialysis solution, said process comprising: (a) forming a granular second composition by dispersing comminuted salts consisting essentially of a major amount of sodium chloride and a minor amount of magnesium chloride and calcium chloride in an amount of water insufficient to dissolve all of said sodium chloride, rapidly vaporizing the water from the dispersion in the presence of recycled particulate second composition to form a chemically homogeneous solid material consisting essentially of an intimate admixture of said salts and crushing said solid material to form the granular second composition and particles for recycle; and (b) mixing the granular second composition with finely divided anhydrous sodium bicarbonate to form said dry, free-flowing granular first composition.
Claim 5
Dependent Claim
134 words
A process for preparing a dry, free-flowing granular first composition suitable for preparing a hemodialysis solution and a peritoneal dialysis solution, said process comprising: (a) forming a granular second composition by intimately admixing salts consisting essentially of a major amount of sodium chloride and a minor amount of magnesium chloride and calcium chloride to form an aqueous mass using, as a source of water, only water of hydration of the magnesium chloride and calcium chloride, and rapidly vaporizing the water from the aqueous mass to form a dry solid consisting of sodium chloride particles coated with dispersed magnesium chloride and calcium chloride, and crushing said dry solid to form the granular second composition; and (b) mixing the granular second composition with finely divided anhydrous sodium bicarbonate to form the dry, free-flowing, granular first composition.
Claim 6
Dependent Claim
134 words
A process for preparing a dry, free-flowing granular first composition suitable for preparing a hemodialysis solution and a peritoneal dialysis solution, said process comprising: (a) forming a granular second composition by intimately admixing salts consisting essentially of a major amount of sodium chloride and a minor amount of magnesium chloride and calcium chloride to form an aqueous mass using, as a source of water, only water of hydration of the magnesium chloride and calcium chloride, and rapidly vaporizing the water from the aqueous mass to form a dry solid consisting of sodium chloride particles coated with dispersed magnesium chloride and calcium chloride, and crushing said dry solid to form the granular second composition; and (b) mixing the granular second composition with finely divided anhydrous sodium bicarbonate to form the dry, free-flowing, granular first composition.
Claim 7
Dependent Claim
37 words
The process of any one of claims 1, 2 or 3 in which the granular second composition contains at least one member selected from the group consisting of potassium ions, lactate ions, acetate ions and gluconate ions.
Claim 8
Dependent Claim
20 words
The process of any one of claims 1, 2 and 3 in which water is rapidly vaporized under reduced pressure.
Claim 9
Dependent Claim
27 words
The process of any one of claims 1, 2 and 3 in which the electromagnetic energy is used as the source of heat for vaporizing the water.
Claim 10
Dependent Claim
35 words
The process of any one of claims 1, 2 and 3 in which the electromagnetic energy is used as the source of heat for vaporizing the water and the water is vaporized under reduced pressure.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-12 | 1992-01-11 | 1992-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-12 | 1996-01-11 | 1996-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-12 | 2000-01-11 | 2000-07-12 | $7700.00 | Window Closed / Lapsed |