Biocompatible devices, systems, and methods for reducing levels of proinflammatory of antiinflammatory stimulators or mediators in the blood
View Patent ↗Devices, systems, and methods reduce levels of proinflammatory or anti-inflammatory stimulators or mediators in blood by selective adsorption. The devices, systems, and methods are useful in situations where abnormal levels of or unregulated or excessive interaction among proinflammatory or anti-inflammatory stimulators or mediators occur, or during events that do induce or have the potential for inducing abnormal production of proinflammatory or anti-inflammatory stimulators or mediators. The devices, systems, and methods serve to prevent, control, reduce, or alleviate the severity of the inflammatory response and disease states that are associated with abnormal levels of or unregulated or excessive interaction among proinflammatory or anti-inflammatory stimulators or mediators.
1. A method for removing cytokines from fresh peritoneal dialysis fluid that has been regenerated from spent peritoneal dialysis solution comprising
removing spent peritoneal dialysis solution from a patient's peritoneal cavity during automated peritoneal dialysis,
conveying the spent peritoneal dialysis solution into an on-line regeneration module that transports waste and toxins from the spent peritoneal dialysis solution while also transporting electrolytes and buffering materials into the peritoneal dialysis solution to regenerate the peritoneal dialysis solution,
removing cytokines from the either the spent peritoneal dialysis solution upstream of the regeneration module or the regenerated peritoneal dialysis solution downstream of the regeneration module, by bringing the peritoneal dialysis solution into contact with an adsorption medium comprising a group of polymeric particles each comprising a hydrophobic core and a biocompatible hydrophilic coating, the adsorption medium selected to have a Biocompatibility index of not greater than 14 derived by a protocol consisting essentially of:
(i) selecting blood indicators which quantify, physiologic changes based upon contact between the adsorption medium and blood, the blood indicators consisting essentially of (1) white blood count diminution as a result of contact with the adsorption medium ascertained by Coulter Counter; (2) red blood cell count diminution as a result of contact with the adsorption medium ascertained by Coulter Counter; (3) platelet count diminution as a result of contact with the adsorption medium ascertained by Coulter Counter; (4) leukocytes activation as a result of contact with the adsorption medium ascertained by measuring polymorphonuclear leukocyte elastase concentration (PMN Elastase Concentration); (5) complement activation as a result of contact with the adsorption medium ascertained by measuring anaphylatoxin C3a-desArg concentrations; (6) occurrence of homolysis as a result of contact with the adsorption medium ascertained by determining concentrations of Lactate dehydrogenase (LDH); and reduction of clot formation as a result of contact with the adsorption medium ascertained by measuring concentrations of thrombin-antithrombin-complex (TAT),
(ii) for each indicator, ascertaining a maximum difference between the indicator values over 25 ml of flow of heperinized blood heperinized to a final concentration of 1.0 IU heparin/ml blood passed through a biocompatible housing without the adsorption medium, comprising a baseline value, and heparinized blood passed through the housing containing the adsorption medium, and for each indicator, expressing the maximum change as a percentage change, relative to the baseline value,
(iii) scoring the percentage change for each indicator as a dimensionless numeric quantity 1, 2, or 3, depending upon the magnitude of the percentage change, in accordance with Table 1,
(iv) after scoring each indicator with a numeric quantity of 1, 2, or 3, adding the numeric quantities scored for all the indicators to obtain a total, the total comprising the Biocompatibility Index,
returning the regenerated peritoneal dialysis solution, after contact with the adsorption medium, to the patient's peritoneal cavity during automated peritoneal dialysis.
2. A method according to claim 1
wherein the Biocompatibility Index is not greater than 7.
3. A method according to claim 1
wherein the polymeric material comprises particles formed from a porous hydrophobic divinylbenzene copolymer having a surface modified to include surface exposed functional groups selected from the group of polymers of 2-hydroxyethyl and N-vinylpyrrolidine.