| PATENT ASSIGNEE'S COUNTRY | USA |
| PATENT NUMBER | This data is not available for free |
| PATENT GRANT DATE | 05.12.2000 |
| PATENT TITLE |
Material for purification of physiological liquids of organism |
| PATENT ABSTRACT |
Purification of physiological liquids of organism is performed by passing a physiological liquid with toxicants removed from a patient through a material which has a size a shape, and a structure selected so as to remove toxic compounds in the molecular range of 300 to 30000 Dalton from the physiological liquid and which is composed of a porous hydrophobic divinylbenzene copolymer which initially has surface exposed vinyl groups in which thereafter the vinyl groups are chemically modified so as to form different surface exposed functional groups with a greater hydrophilicity and greater biocompatibility than those of the vinyl groups. |
| PATENT INVENTORS | This data is not available for free |
| PATENT ASSIGNEE | This data is not available for free |
| PATENT FILE DATE | August 2, 1999 |
| PATENT PARENT CASE TEXT | This data is not available for free |
| PATENT CLAIMS |
We claim: 1. A material for purification of physiological fluids of organism, comprising a porous hydrphobic divinylbenzene copolymer which has a size, a shape, and a structure providing removal of toxic compounds from a physiological liquid and which initially has surface exposed vinyl groups in which thereafter the vinyl groups are chemically modified to form different surface exposed functional groups, which are hydrophilic and biocompatible wherein the said modification comprises methods, selected from the group (A) grafting hydrophilic polymer chains by a radical polymerization of 2-hydroxyethyl methacrylate, N-vinylpyrrolidone or N-vinylcaprolactam, (B) oxidation of the vinyl groups to epoxy groups with the subsequent reaction of the epoxy groups with water, ethylene glycol, amines or 2-aminoethanol, and (C) depositing high-molecular weight hemicompatible poly(trifluoroethoxy)phosphazene onto the surface of a polymer. 2. A material as defined in claim 1, wherein said porous hydrphobic divinylbenzene copolymer comprises a copolymer of divinylbenzene with comonomers selected from the group consisting of styrene, ethylstyrene, acrylonitrile, and buthyl methacrylate. |
| PATENT DESCRIPTION |
BACKGROUND OF THE INVENTION The present invention relates to material for purification of physiological liquids of organism. It is well known that physiological liquids of organisms such as blood, plasma, peritoneal liquid etc., accumulate and transport various toxicants in the case of poisoning the organism as well as in the case of diseases, in particular diseases of liver and kidneys. It is therefore advisable to remove the toxicants from the physiological liquids to significantly improve the situation of the patient. A plurality of methods have been invented and have been utilized for removing toxicants from blood, plasma and other physiological liquids. One of the most efficient methods is hemodialysis. This method, however, is generally restricted to removing small toxic molecules, whereas toxins belonging to the so-called middle-size molecules (between 500 and 30000 Dalton molecular weight) are eliminated too slowly, even with modern "high flux" dialyser membranes. It is believed to be advisable to further improve the existing methods so as to provide an efficient purification of the physiological liquid of organism, especially with respect to above toxicants having larger molecular sizes, for the purpose of preventing propagation of diseases or curing the disease. According to the present invention, a wider spectrum of toxic compounds should be removable from blood or other physiological fluids, if conventional hemodialysis procedure is supplemented with an adsorption procedure. The latter should be responsible for removing larger toxins which diffusion through the membrane of the dialyser is too slow. The adsorbing material should both exhibit high adsorption capacity toward toxins in the middle range of molecular weights and disply sufficient compatibility with blood or the corresponding physiological fluid. Designing suitable polymeric adsorbing material is one of the aims of present invention. Macroporous styrene-divinylbenzene copolymers represents the most popular type of polymeric adsorbing materials. Many companies manufacture adsorbents of this category. Amberlite XAD-4 (by Rohm and Haas) being probably the best known one. Equally interesting, though less abandoned, are macroporous adsorbing materials manufactured by copolymerization of divinylbenzene (DVB) with other monomers, i.g., buthyl methacrylate, acrylo nitrile and others. In order to maintain the porous architecture and nearly constant volume of polymeric particles under various conditions of usage, the three-dimensional network of these polymers has to be sufficiently rigid, i.e., it must contain a high proportion of crosslinking divinylbenzene. The latter product, when in pure state, is rather expensive. The more available technical product contains up to 30-40% of ethylvinyl styrene, so that commercially available macroporous adsorbents should be better referred to as copolymers of DVB, ethylvinyl styrene and styrene. Usually, this monomer mixture is provided with organic solvents serving as the diluters which cause a micro phase separation during the polymerization procedure and thus resulting in the macroporous structure of the final material. It has been shown repeatedly that the radical polymerization procedure does never consume all the vinyl groups of DVB introduced into copolymerization. On the average, about 30% of DVB species fail to serve as crosslinking bridges and remain involved into the network with only one of its two vinyl groups. The presence of a relatively high amount of pending vinyl groups is therefore a characteristic feature of the macroporous adsorbents. It can be expected that these free vinyl groups are preferably exposed to the surface of the polymer beads and their macropores and should be readily available to chemical modification. The chemical modification of the surface of macroporous DVB-copolymers relies on chemical reactions of the surface-exposed pendant vinyl groups and aims at converting these groups into more hydrophilic functional groups. This conversion provides the initial hydrophobic adsorbing material with the property of hemocompatibility, since the hydrophilic surfaces adsorb less blood cells and plasma proteins and do not activate the clotting cascades as rapidly as does the initial hydrophobic surface. Some solutions were disclosed in our earlier patent application Ser. No. 08/756,445. SUMMARY OF THE INVENTION Accordingly, it is an object of present invention to provide a material for purification of physiological liquids of organism, which is a further modification in the above specified field. In accordance with the present invention, the material for purification of physiological liquids of organism is proposed, which is composed of a porous hydrophobic divinylbenzene copolymer which initially has surface exposed vinyl groups in which thereafter the vinyl groups are chemically modified so as to form different surface exposed functional groups with a greater hydrophilicity and greater biocompatibility than those of the vinyl groups. When the material for purification of physiological liquids of organism is provided in accordance with the applicant's invention, it provides for highly advantageous results. DESCRIPTION OF PREFERRED EMBODIMENTS In accordance with the present invention, a purification of physiological liquids of organism by removing toxicants is proposed. A patient's blood is withdrawn from an arterial blood circulatory access point, passed through a material in accordance with the present invention which removes toxicants, and re-enters the patient through a venous access point. Preferably, the material has a size, a shape, and a structure selected so as to remove the toxic compounds in the molecular range of 300 to 30,000 Dalton from the physiological liquid. The material in accordance with the present invention which is used in the inventive method for purification of physiological liquids of organism and which is produced in accordance with the inventive production method, is a porous hydrophobic divinylbenzene copolymer which initially has surface exposed vinyl groups in which thereafter the vinyl groups are chemically modified so as to form different surface exposed functional groups with a greater hydrophilicity and greater biocompatibility than those of the vinyl groups. According to the present potential invention, the modification of the surface vinyl groups was made in aqueous or aqueous organic media in the following three principal directions: grafting hydrophilic polymer chains by a radial polymerization of 2-hydroxyethyl methacrylate, N-vinylpyrrolidone, N-vinylcaprolactam, or other water soluble monomers, oxidation of the vinyl groups to epoxy groups with the subsequent reaction of the epoxy groups with water, ethylene glycol, amines or 2-amonoethanol molecules, and depositing high-molecular-weight hemocompatible polymer, in particular poly(trifluorethoxy) phosphazene onto the surface of the polymeric beads. In any case the hydrophilic nature of thus modified surfaces could be visualized by the easy wetting of dried modification material with water, whereas the initial dry unmodified adsorbent cannot be wetted by an immediate contact with water. In the following examples, a mesoporous divinylbenzene-ethylstyrene-styrene copolymer, a typical polystyrene-type adsorbing material and a copolymer of DVB with buthyl methacrylate with surface exposed double bonds were taken for the modification. The surface-modified materials were shown to exhibit good hemocompatibility, i.e., they did not change noticeably the coagulation time of blood, caused no hemolysis and showed no cytotoxicity effects. When contacted with plasma or whole blood, the materials effectively removed the pool of middle-sized molecules, as could be easily followed by conventional spectrophotometric measurements. Preparation of Mesoporous Divinylbenzene Copolymers |
| PATENT EXAMPLES | This data is not available for free |
| PATENT PHOTOCOPY | Available on request |
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