Hemodialysis processes & hemodialysis solutions

In a hemodialysis process wherein a dialyzing solution is used to hemodialyze a mammalian blood through a dialysis membrane, the improvements of which comprises the steps of:

• (A) preparing a starting dialyzing solution comprising water which has dissolved therein components generically characterized as follows:
• ______________________________________ Quantity range in Component mmoles per liter ______________________________________ total cations (mEg/L) about 130 to 170 (a) sodium.sup.1+ about 130 to 155 (b) potassium.sup.1+ about 0 to 6 (c) calcium.sup.2+ about 0 to 3 (d) magnesium.sup.2+ about 0 to 2 total anions (mEq/L) about 130 to 170 (e) chloride.sup.1- about 84 to 125 (f) bicarbonate.sup.1- about 0 to 80 (g) L-lactate.sup.1- /pyruvate.sup.1- about 0 to 80 (h) D-.beta. hydroxybutyrate.sup.1- / about 0 to 80 acetoacetate (i) sum (f + g + h) about 25 to 80 total nonionics about 0 to 525 (j) carbon dioxide about 0 to 25 (k) osmotically active about 0 to 500 materials millequivalent ratios of near equilibrium couples (if present) (l) bicarbonate:CO.sub.2 about 0.1/1 to 55/0.1 (m) L-lactate:pyruvate about 20/1 to 1/1 (n) D-.beta. hydroxybutyrate:acetoacetate about 6/1 to 0.5/1 (o) sodium:chloride about 1.24 to 1.55 milliosmolarity about 260 to 765 pH about 5 to 9 ______________________________________
• (B) commencing said hemodialysis of said blood using said starting dialyzing solution,
• (C) changing the concentration ratio of at least two selected anions relative to one another in said starting dialyzing solution during the dialyzing procedure, thereby also simultaneously altering the concentration ratio of each of said selected anions to each of the remaining respective anions present in said starting dialyzing solution, thereby producing a resulting dialyzing solution, said resulting dialyzing solution comprising water which has dissolved therein components as generically above characterized, and
• (D) continuing said hemodialysis of said blood using said resulting dialyzing composition while said changing is occurring.

In a hemodialysis process wherein a dialyzing solution is used to hemodialyze a mammalian blood through a dialysis membrane, the improvement of which comprises the steps of:

• (A) preparing a plurality of staring materials, each said material, comprising a preselected subcombination of components desired in a dialyzing solution comprising water which has dissolved therein components generically characterized as follows:
• ______________________________________ Quantity range in Component mmoles per liter ______________________________________ total cations (mEg/L) about 130 to 170 (a) sodium.sup.1+ about 130 to 155 (b) potassium.sup.1+ about 0 to 6 (c) calcium.sup.2+ about 0 to 3 (d) magnesium.sup.2+ about 0 to 2 total anions (mEq/L) about 130 to 170 (e) chloride.sup.1- about 84 to 125 (f) bicarbonate.sup.1- about 0 to 80 (g) L-lactate.sup.1- /pyruvate.sup.1- about 0 to 80 (h) D-.beta. hydroxybutyrate.sup.1- / about 0 to 80 acetoacetate (i) sum (f + g + h) about 25 to 80 total nonionics about 0 to 525 (j) carbon dioxide about 0 to 25 (k) osmotically active about 0 to 500 materials millequivalent ratios of near equilibrium couples (if present) (l) bicarbonate:CO.sub.2 about 0.1/1 to 55/0.1 (m) L-lactate:pyruvate about 20/1 to 1/1 (n) D-.beta. hydroxybutyrate:acetoacetate about 6/1 to 0.5/1 (o) sodium:chloride about 1.24 to 1.55 milliosmolarity about 260 to 765 pH about 5 to 9 ______________________________________
• (B) charging each of said starting components and optionally water to a mixing zone while simultaneously and separately regulating the instantaneous flow rate at which each respective said components enters said mixing zone thereby providing a desired resulting dialyzing solution having a predetermined composition at any given time, said composition being within said generic characterization,
• (C) moving said resulting dialyzing solution from said mixing zone over one side of said dialysis membrane while passing said blood over the opposed side of said dialysis membrane, thereby hemodialyzing said blood with said dialyzing solution, and
• (D) changing each one of a plurality of said respective instantaneous flow rates in a predetermined manner during both said charging and said moving, whereby the concentration ratio of at least one selected anions of said dialyzing solution changes one to the other from an initial predetermined formulation to a final predetermined formulation during said hemodialysis procedure.

In a hemodialysis apparatus of the type which moves dialyzing solution over one face of a dialysis membrane while mammalian blood is passed over the opposed face of such membrane, the improvement which comprises the combination:

• (A) a plurality of reservoir means, each one of which is adapted to supply a different starting subcombination of components such that when such component subcombinations are mixed together in predetermined proportions, a desired such dialyzing solution results,
• (B) conduit means interconnecting said reservoir means in a predetermined pattern and including a dialyzing solution mixing chamber means,
• (C) means for regulating the individual output of each component subcombination from its respective means to said mixing chamber means to produce a desired such dialyzing solution and to change the concentration ratio of at least two of the cation and/or anion components in such dialyzing solution one to the other from an initial predetermined value to a final predetermined value within a predetermined dialysis time interval,
• (D) solution delivery means for moving said desired dialyzing solution from said mixing chamber means over said one face of said dialysis membrane;
• and
• (E) blood delivery means for moving said blood over said opposed face of said dialysis membrane.

In a hemodialysis apparatus of the type which hemodialysis fluid over one face of a dialysis membrane while mammalian blood is passed over the opposed face of such membrane, the improvement which comprises in combination:

• (a) is plurality of reservoir means, each one of which is adapted to hold a different starting subcombination of components such that said component subcombination when admixed together in predetermined proportions comprises a desired dialyzing solution
• (b) a mixing chamber means,
• (c) a different variable valve means functionally associated with each one of said reservoir means,
• (d) conduit means connecting each of said valve means with said mixing chamber means,
• (e) means for pressurizing each of said reservoir means to a predetermined extent,
• (f) programmable computer means functionally associated with each of said valve means, said computer being adapted to regulate individually the rate of flow of each of said component subcombination from its associated said reservoir means into said mixing chamber means at a predetermined value to change the concentration ratio one to the other of at least two of the cations and/or anions dissolved in said dialyzing solution from an initial predetermined value to a final predetermined value within a predetermined dialysis time interval,
• (g) dialysis solution delivery means for moving fluid from said mixing chamber means over said one face of said dialysis membrane, and
• (h) blood delivery means for moving said blood over said opposed face of said dialysis membrane.

In a hemodialysis separable apparatus of the type which moves dialyzing solution over one face of a dialysis membrane while mammalian blood is passed over the opposed face of such membrane, during dialysis, the improvement which comprises in combination:

• (a) a series of at least two individually geometrically configured, gradient making reservoir means, each one of which is adapted to hold a different starting subcombination solution having ion components such that said solution subcombinations when admixed together in predetermined proportions comprise a desired dialyzing solution, said reservoir means including cooperating means interconnecting respective ones of said reservoir means causing the respective such solution in each one of said reservoir means to successively flow therefrom at a predetermined rate into a preselected another one of said reservoir means in said series, providing a desired said dialyzing solution with the concentration ratio one to the other of at least two of the components of such dialyzing solution changing from an initial predetermined value to a different final predetermined value within a predetermined time interval, during said dialysis;
• (b) solution delivery means for moving said desired dialyzing solution over said one face of said dialysis membrane, and
• (c) blood delivery means for moving said blood over said opposed face of said dialysis membrane.