EP1067974A1 - Formkörper aus wirkstoffhaltigen thermoplastischen polyurethanen - Google Patents

Formkörper aus wirkstoffhaltigen thermoplastischen polyurethanen

Info

Publication number
EP1067974A1
EP1067974A1 EP99914501A EP99914501A EP1067974A1 EP 1067974 A1 EP1067974 A1 EP 1067974A1 EP 99914501 A EP99914501 A EP 99914501A EP 99914501 A EP99914501 A EP 99914501A EP 1067974 A1 EP1067974 A1 EP 1067974A1
Authority
EP
European Patent Office
Prior art keywords
active ingredient
polymer
antibiotic
polyurethane
weight
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP99914501A
Other languages
German (de)
English (en)
French (fr)
Inventor
Reinhard Albers
Ralf Dujardin
Heinz Pudleiner
Joachim Simon
Günther EBERZ
Wolfgang Kreiss
Christina Krasemann-Sharma
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayer AG
Original Assignee
Bayer AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bayer AG filed Critical Bayer AG
Publication of EP1067974A1 publication Critical patent/EP1067974A1/de
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L29/00—Materials for catheters, medical tubing, cannulae, or endoscopes or for coating catheters
    • A61L29/04—Macromolecular materials
    • A61L29/06—Macromolecular materials obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L29/00—Materials for catheters, medical tubing, cannulae, or endoscopes or for coating catheters
    • A61L29/14—Materials characterised by their function or physical properties, e.g. lubricating compositions
    • A61L29/16—Biologically active materials, e.g. therapeutic substances
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
    • C08G18/12—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step using two or more compounds having active hydrogen in the first polymerisation step
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
    • C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
    • C08G18/6666—Compounds of group C08G18/48 or C08G18/52
    • C08G18/667—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
    • C08G18/6674—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
    • C08K5/0058—Biocides
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2300/00—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices
    • A61L2300/40—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices characterised by a specific therapeutic activity or mode of action
    • A61L2300/404—Biocides, antimicrobial agents, antiseptic agents
    • A61L2300/406—Antibiotics

Definitions

  • Molded body made of active ingredient-containing thermoplastic polyurethanes
  • the invention relates to molded articles made of thermoplastic polyurethanes (TPU), in particular medical articles such as central venous catheters, which have antibiotic activity
  • TPU thermoplastic polyurethanes
  • central venous catheters The frequency of bacterially induced infections in central venous catheters is on average around 5%. In total, central venous catheters are responsible for approx. 90% of all sepsis cases in intensive care medicine. The use of central venous catheters therefore not only poses a high risk of infection for the patient, but also causes enormously high therapeutic follow-up costs (follow-up treatment, extended hospital stays).
  • peri- or post-operative measures can only partially solve this problem.
  • a rational strategy for the prevention of polymer-associated infections is to modify the polymeric materials used. The aim of this modification must be to inhibit bacterial adhesion or the proliferation of already adhered bacteria, in order to avoid causal foreign body infections. This can e.g. by incorporating a suitable chemotherapeutic agent into the polymer matrix (e.g. antibiotics), provided that the incorporated active ingredient also comes from the
  • the release of the antibiotic can be extended over a longer period of time, so that bacterial adhesion or proliferation on the polymer is prevented for a correspondingly longer period of time.
  • DE-A-41 43 239 shows a method for introducing active substances into the outer layer of medical articles (impregnation).
  • the implantable device made of polymeric material is swollen in a suitable solvent.
  • the polymer matrix is changed so that a pharmaceutical active ingredient or combination of active ingredients can penetrate into the polymeric material of the implant.
  • the active ingredient is included in the polymer matrix.
  • the active ingredient contained in the implantable device is passed through
  • the release profile can be adjusted by the choice of solvent and by varying the experimental conditions.
  • the coatings consist of a polymer matrix, in particular of polyurethanes, silicones or biodegradable polymers, and an antimicrobial substance, preferably a synergistic combination of a silver salt with chlorhexidine or an antibiotic.
  • the object of the invention was to provide antibiotic moldings, in particular medical articles such as catheters, which efficiently prevent surface colonization by germs for a relatively long period (2 to 4 weeks).
  • the invention thus relates to moldings made of an antibiotic substance in a homogeneous distribution containing thermoplastic polyurethane, which have a roughness depth ⁇ 5 ⁇ m, preferably ⁇ 2 ⁇ m, particularly preferably ⁇ 1 ⁇ m.
  • antibiotically active substances which have a broad spectrum of activity against the pathogenic microorganisms involved in polymer-associated infections, in particular against coagulase-negative staphylococci, staphylococcus aureus and Candida species, are suitable as antibiotic substances.
  • the antibiotically active substances can also be used as combinations of active substances in the shaped bodies, provided that their effects do not antagonize.
  • the active ingredient used must have sufficient (chemical) stability in the polymer matrix.
  • the microbiological activity of the active ingredient in the polymeric matrix and under the process conditions of incorporation must not be impaired. - 5 -
  • the incorporation of the pharmaceutically active substance should neither impair the biocompatibility of the polymer compartments nor other desirable polymer-specific properties of the polymer material (elasticity, tear strength, etc.).
  • Suitable antibiotic substances are, for example, nalixidic acid and nalixidic acid derivatives, such as e.g. Ciprofloxacin, norfloxacin, ofloxacin, pefloxacin,
  • Enoxacin preferably ciprofloxacin, aminoglycosides, e.g. Gentamycin, kanamycin, amikacin, sisomycin, preferably gentamycin and kanamycin, macorcyclic antibiotics such as e.g. Rifampicin or erythromycin, preferably rifampicin, bacitracin, mupirocin, thyrothricins such as e.g. Gramicidin, tyrocidin, lincomycin, clindamycin or fusidic acid.
  • aminoglycosides e.g. Gentamycin, kanamycin, amikacin, sisomycin, preferably gentamycin and kanamycin
  • macorcyclic antibiotics such as e.g. Rifampicin or erythromycin, preferably rifampicin, bacitracin, mupirocin, thyrothricins such as e.g. Gram
  • the active ingredients are preferably incorporated in a concentration corresponding to their antibiotic activity.
  • the active compounds are particularly preferably used in a concentration range from 0.1 to 5.0% by weight.
  • thermoplastically processable polyurethanes which can be used according to the invention are made by converting the polyurethane-forming components
  • Suitable organic diisocyanates A) are, for example, aliphatic, cycloaliphatic, heterocyclic and aromatic diisocyanates, such as those in Justus
  • Examples include: aliphatic diisocyanates such as hexamethylene diisocyanate, cycloaliphatic diisocyanates such as isophorone diisocyanate, 1,4-cyclohexane diisocyanate, l-methyl-2,4-cyclohexane diisocyanate and l-methyl-2,6- cyclohexane diisocyanate and the corresponding isomer mixtures, 4,4'-dicyclohexyl methane diisocyanate, 2,4'-dicyclohexyl methane diisocyanate and 2,2'-dicyclohexyl methane diisocyanate as well as the corresponding isomer mixtures, aromatic diisocyanates, such as 2,4-tolylene diisocyanate, mixtures of 2,4-tolylene diisocyanate and 2,6-
  • Toluene diisocyanate 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate and 2,2'-diphenylmethane diisocyanate, mixtures of 2,4'-diphenylmethane diisocyanate and 4,4'-diphenylmethane diisocyanate, urethane-modified liquid 4,4'- Diphenylmethane diisocyanates and 2,4'-diphenylmethane diisocyanates, 4,4'-diisocyanatodiphenylethane (1,2) and 1,5-naphthylene diisocyanate.
  • the diisocyanates mentioned can be used individually or in the form of mixtures with one another.
  • polyisocyanates for example triphenylmethane 4,4 ', 4 "triisocyanate or polyphenyl polymethylene polyisocyanates.
  • component B are linear hydroxyl-terminated polyols with a medium
  • Molecular weight M n from 500 to 10,000, preferably 500 to 5000, particularly preferably 600 to 2000 used. Due to production, these often contain small amounts of branched compounds. One therefore often speaks of "essentially linear polyols". Polyether diols, polycarbonate diols, sterically hindered polyester diols, hydroxyl-terminated polybutadienes or mixtures thereof are preferred.
  • Polysiloxane diols of the formula (I) can also be used as soft segments, alone or in a mixture with the diols mentioned above.
  • m has a value of 1 to 30, preferably 10 to 25 and particularly preferably 15 to 25,
  • n has a value from 1 to 4, and
  • R 1 is an alkyl group with 1 to 6 C atoms or a phenyl group
  • Suitable polyether diols can be prepared by reacting one or more alkylene oxides with 2 to 4 carbon atoms in the alkylene radical with a starter molecule which contains two active hydrogen atoms bonded. Examples of alkylene oxides are: ethylene oxide, 1,2-propylene oxide, epichlorohydrin and
  • 1,2-butylene oxide and 2,3-butylene oxide Ethylene oxide, propylene oxide and mixtures of 1,2-propylene oxide and ethylene oxide are preferably used.
  • the alkylene oxides can be used individually, alternately in succession or as mixtures.
  • suitable starter molecules are: water, amino alcohols, such as N-alkyl-diethanolamines, for example N-methyl-diethanolamine, and
  • Diols such as ethylene glycol, 1,3-propylene glycol, 1,4-butanediol and 1,6-hexanediol. If appropriate, mixtures of starter molecules can also be used.
  • Suitable polyether diols are also the hydroxyl-containing polymerization products of tetrahydrofuran.
  • Trifunctional polyethers can also be used in proportions of 0 to 30% by weight, based on the bifunctional polyethers, but at most in such an amount that a thermoplastically processable product is formed.
  • the essentially linear polyether diols can be used both individually and in the form of mixtures with one another.
  • Suitable sterically hindered polyester diols can be prepared, for example, from dicarboxylic acids having 2 to 12 carbon atoms, preferably 4 to 6 carbon atoms, and polyhydric alcohols.
  • suitable dicarboxylic acids are: aliphatic dicarboxylic acids, such as succinic acid, glutaric acid, adipic acid, suberic acid, azelaic acid and sebacic acid, and aromatic dicarboxylic acids, such as phthalic acid, isophthalic acid and terephthalic acid.
  • the dicarboxylic acids can be used individually or as mixtures, for example in the form of a mixture of succinic, glutaric and adipic acids.
  • polyester diols it may be advantageous to use the corresponding dicarboxylic acid derivatives, such as carboxylic acid diesters having 1 to 4 carbon atoms in the alcohol residue, carboxylic acid anhydrides or carboxylic acid chlorides, instead of the dicarboxylic acids.
  • dicarboxylic acid derivatives such as carboxylic acid diesters having 1 to 4 carbon atoms in the alcohol residue, carboxylic acid anhydrides or carboxylic acid chlorides, instead of the dicarboxylic acids.
  • polyhydric alcohols are sterically hindered glycols with 2 to 10, preferably 2 - 9 -
  • up to 6 carbon atoms which bear at least one alkyl radical in the ⁇ -position relative to the hydroxyl group such as 2,2-dimethyl-1,3-propanediol, 2-methyl-2-propyl-1,3-propanediol, 2,2-diethyl-1 , 3-propanediol, 2-ethyl-l, 3-hexanediol, 2,5-dimethyl-2,5-hexanediol, 2,2,4-trimethyl-l, 3-pentanediol, or mixtures with ethylene glycol, diethylene glycol, 1, 4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,10-decanediol, 1,3-propanediol and dipropylene glycol.
  • alkyl radical in the ⁇ -position relative to the hydroxyl group
  • the polyhydric alcohols can be used alone or, if appropriate, as a mixture with one another.
  • esters of carbonic acid with the diols mentioned in particular those with 3 to 6 carbon atoms, such as 2,2-dimethyl-1,3-propanediol or 1,6-hexanediol, condensation products of hydroxycarboxylic acids, for example hydroxycaproic acid and polymerization products of lactones , for example optionally substituted caprolactones.
  • the polyester diols used are preferably neopentyl glycol polyadipate 1,6-hexanediol neopentyl glycol polyadipate.
  • the polyester diols can be used individually or in the form of mixtures with one another.
  • Chain extenders C) used are diols, diamines or amino alcohols with a molecular weight of 60 to 500, preferably aliphatic diols with 2 to 14 carbon atoms, such as, for example, ethanediol, 1,6-hexanediol, diethylene glycol, dipropylene glycol and in particular 1,4-butanediol.
  • diesters of terephthalic acid with glycols having 2 to 4 carbon atoms such as, for example, terephthalic acid bis-ethylene glycol or terephthalic acid bis-1, 4-butanediol, hydroxyalkylene ether of hydroquinone, such as, for example, 1,4-di (-hydroxyethyl), are also suitable.
  • aliphatic diamines such as isophoronediamine, ethylenediamine, 1,2-propylene-diamine, 1,3-propylene-diamine, N-methyl-propylene-1,3-diamine, 1,6- Hexamethylenediamine, 1,4-diaminocyclohexane, 1,3-diaminocyclohexane, N, N'-dimethyl-ethylenediamine and 4,4'-dicyclohexylmethane diamine and aromatic diamines, such as, for example, 2,4-tolylene diamine and 2,6-tolylene diamine , 3,5-diethyl-2,4-toluenediamine and 3,5-diethyl-2,6-toluenediamine and primary mono-, di-, tri- or tetraalkyl-substituted 4,4'-diaminodiphenylmethane diamine and aromatic diamines, such as, for example, 2,4-tolylene di
  • chain extender can be used.
  • Smaller amounts of trifunctional or higher functional crosslinking agents can also be added, e.g. Glycerin, trimethylolpropane, pentaerythritol, sorbitol. 1,4-Butanediol, 1,6-hexanediol, isophoronediamine and mixtures thereof are particularly preferably used.
  • monofunctional compounds can also be used in small amounts, e.g. as a chain terminator or mold release.
  • examples include alcohols such as octanol and stearyl alcohol or amines such as butylamine and stearylamine.
  • the molar ratios of the structural components can be varied over a wide range, as a result of which the properties of the product can be adjusted.
  • Molar ratios of polyols to chain extenders from 1: 1 to 1:12 have proven successful.
  • the molar ratio of diisocyanates and polyols is preferably 1.2: 1 to 30: 1. Ratios of 2: 1 to 12: 1 are particularly preferred.
  • the structural components if appropriate in the presence of catalysts, auxiliaries and additives, can be used to prepare the TPU amounts are reacted such that the equivalence ratio of NCO groups to the sum of the NCO-reactive groups, in particular the hydroxyl or amino groups of the low molecular weight diols / triols, amines and the polyols 0.9: 1 to 1.2: 1, is preferably 0.98: 1 to 1.05: 1, particularly preferably 1.005: 1 to 1.01: 1.
  • the polyurethanes which can be used according to the invention can be prepared without catalysts; in some cases, however, the use of catalysts may be appropriate. In general, the catalysts are used in amounts of up to 100 ppm, based on the total amount of starting materials.
  • Suitable catalysts according to the invention are the tertiary amines known and customary in the prior art, such as e.g. Triethylamine, dimethylcyclohexylamine, N-methylmorpholine, N, N'-dimethyl-piperazine, 2- (dimethylamino-ethoxy) -ethanol, diazabicyclo- (2,2,2) -octane and similar and in particular organic metal compounds such as titanium acid esters,
  • Iron compounds for example tin diacetate, tin dioctoate, tin dilaurate - 11 -
  • Dibutyltin diacetate and dibutyltin dilaurate are preferred; amounts of 1 to 10 ppm are sufficient to catalyze the reaction.
  • auxiliaries and additives can also be added.
  • lubricants such as fatty acid esters, their metal soaps, fatty acid amides and silicone compounds, antiblocking agents, inhibitors, stabilizers against hydrolysis, light, heat and discoloration, flame retardants, dyes, pigments, inorganic or organic fillers and reinforcing agents.
  • Reinforcing agents are in particular fibrous reinforcing materials, such as inorganic fibers, which are produced according to the prior art and can also be supplied with a size. More detailed information on the auxiliaries and additives mentioned can be found in the specialist literature, for example J.H. Saunders, K.C. Frisch: "High Polymers", Volume XVI, Polyurethane, Parts 1 and 2, Interscience Publishers 1962 and 1964, R.Gumbleter, H.Müller (Ed.): Taschenbuch der
  • Plastic additives 3rd edition, Hanser Verlag, Kunststoff 1989, or DE-A 29 01 774.
  • the build-up of the thermoplastically processable polyurethane elastomers is preferably carried out step by step in the so-called prepolymer process.
  • an isocyanate-containing prepolymer is formed from the polyol and the diisocyanate, which is reacted with the chain extender in a second step.
  • the TPU can be manufactured continuously or discontinuously.
  • the best known technical manufacturing processes are the belt process and the extruder process.
  • the amount of the release rate of the antibiotic substance can be regulated by varying the amount of active ingredient incorporated, since the amount of active ingredient released is then proportional to the concentration in the matrix.
  • Combinations of matrix and active substance which have an interfacial energy of 3 to 30 mN / m, particularly preferably 8 to 15 mN / m, very particularly preferably 10 to 13 mN / m are preferably selected for the production of the moldings according to the invention.
  • a combination erf ⁇ ndungswash preferred is ciprofloxacin in a matrix of from polytetrahydrofuran, isophorone diisocyanate, iso- phrondiamin and 1, 6-hexanediol produced TPU, which is sold under the trade name Texin ® 5590 (Bayer Corp., Pittsburgh, PA 15205-9741) .
  • Active substance concentrations between 0.1 and 1.0% by weight of ciprofloxacin are sufficient to efficiently prevent bacterial surface colonization of the polymer surface.
  • the shaped bodies according to the invention are distinguished by the fact that they have a molecularly disperse distribution of the antibiotic substance in the polymer matrix.
  • the high morphological homogeneity of the extruded plastics containing the active ingredient could be demonstrated by means of light and scanning electron microscope images.
  • Polymer surface is not affected by the addition or release of the active ingredient.
  • the surface of the moldings according to the invention has a roughness depth ⁇ 5 ⁇ m, preferably ⁇ 2 ⁇ m, particularly preferably ⁇ 1 ⁇ m. This is an essential factor for the good biocompatibility of the shaped bodies according to the invention and additionally complicates the settlement of germs and adherence of cellular blood components on the surface.
  • Comparable active substance-containing samples which were produced by means of the casting film method (solvent casting), on the other hand, are significantly more inhomogeneous. Scanning electron microscopic studies show that the active ingredients incorporated in the
  • Polymer matrix and partly on the surface are in the form of crystal structures.
  • the crystal formations cause the mechanical properties of the polymer to deteriorate drastically.
  • the extracted crystal dressings leave a rough surface, which leads to reduced biocompatibility.
  • the mechanical properties of the polymer are markedly improved by the addition of the antibiotic substances in amounts of 0.01 to 10% by weight, preferably 0.1 to 5% by weight.
  • the active substances introduced change the surface tension of the soft phase of the TPU formed essentially from components (B), thus increasing the phase separation of the block copolymer and thus improving the morphology of the polymer.
  • the active substances introduced bring about a significant improvement in the mechanical properties in addition to the improved biocompatibility.
  • the tensile strengths of the active ingredient-containing TPU increase significantly compared to the active ingredient-free TPU and the permanent strains are measurably reduced.
  • the elongations at break are reduced only slightly, which also indicates an improved elastomeric structure of the TPU. - 14 -
  • the moldings according to the invention can be produced by extruding a melt consisting of the polymer and active ingredient.
  • the melt can contain 0.01 to 10% by weight, preferably 0.1 to 5% by weight, of active ingredient.
  • the components can be mixed in any manner using known techniques.
  • the active ingredient can, for example, be introduced directly into the polymer melt in solid form.
  • a masterbatch containing active ingredient can also be melted directly with the polymer or mixed with the polymer melt already present.
  • the active ingredient can also be applied to the polymer using known techniques (by tumbling, spraying, etc.) before the polymer is melted.
  • the mixing / homogenization of the components can be carried out according to known techniques using kneaders or screw machines, preferably in single or twin screw extruders in a temperature range between 150 and 200 ° C.
  • the granules containing the active ingredient obtained in this way can be further processed by the known techniques of thermoplastic processing (injection molding, extrusion, etc.).
  • the moldings are speck-free, flexible, do not stick and can be sterilized without any problems using the usual methods. - 15 -
  • the prepolymer was dissolved in toluene and added dropwise with stirring at room temperature to a solution of 71.6 parts by weight of isophoronediamine in 2456 parts by weight of a mixture of toluene and isopropanol (70/30). A colorless, transparent and homogeneous solution was obtained. After removing the solvent at 65 ° C./15 mbar, colorless, transparent polymer plates were obtained, which were comminuted using a chopper. The chopped granules were finally extruded on a ZSK1 twin-screw extruder and strand-granulated. A colorless, clear and non-sticky cylindrical granulate was obtained.
  • Part of the cylinder granulate was injection molded into test specimens for microbiological in vitro investigations and for the determination of the release profile of the incorporated active ingredient (control tests).
  • a part of the cylinder granulate was processed into test specimens (plates) for microbiological in vitro investigations as well as for the determination of the release professional of the incorporated active substance in injection molding.
  • Tecoflex ® EG 85 A from Thermedics, Woburn MA 01888-1799) - 17 -
  • the granules became test specimens for microbiological in vitro investigations and for determining the release profile of the incorporated active ingredient
  • the granules were injection molded into test specimens (plates) for in vitro microbiological investigations and for determining the release profile of the incorporated active ingredient.
  • Tecoflex ® EG 85 A Tecoflex ® EG 85 + Tecoflex ® EG 85 + (example 3) 0.5% by weight 0.5% by weight bacitracin gramicidin (example 4) (example 5)
  • Cylinder granules made of thermoplastic polyurethane (Texin® 5590, Bayer Corp.) dissolved in chloroform and mixed with 27.16 g of ciprofloxacin betaine. The mixture was heated (approx. 70 ° C) until a colorless, homogeneous solution was obtained. After removal of the solvent at 65 ° C./15 mbar, colorless, slightly opaque polymer plates were obtained, which were comminuted using a chopping machine.
  • thermoplastic polyurethane Texin® 5590, Bayer Corp.
  • the 3.5% by weight masterbatch was mixed with 1664 g of active ingredient-free cylindrical granulate and extruded on a ZSKl twin-screw extruder. A clear melt was obtained which, after cooling in a water / air bath and strand pelletization, gave colorless, clear cylindrical pellets. - 19 -
  • the granules were injection molded into test specimens (plates) for in vitro microbiological investigations and for determining the release profile of the incorporated active ingredient.
  • the amount of active substance the greater the active substance concentration released from the polymer matrix in the elution medium.
  • the microbiological evaluation and the quantification of the active ingredient release was carried out using a new bioimaging technique.
  • the method uses the selective effect-dependent bioluminescence of sensor bacteria (E. coli test strain) to visualize the biological activity of the active ingredient released by the polymer.
  • sensor bacteria E. coli test strain
  • the inhibitory effect is exploited ciprofloxacin.
  • FIG. 1 shows bioluminescence images of ciprofloxacin-containing polymer patterns
  • Samples 1 and 2 are injection-molded foils containing ciprofloxacin, sample 3 a cast foil containing ciprofloxacin, sample 4 a polymer sample free of active ingredient (negative control).
  • the left picture of the figure shows the cross section of the 1 cm 2 large sample plates, the right one the top view.
  • the luminescence images show that the cast film (3) releases higher doses of ciprofloxacin than the injection molded films (1 + 2).
  • the negative control (4) shows no luminescence.
  • Catheters were made by qualitative comparison with drug-free control catheters on a pig model developed at RWTH Aachen University (KLOSTERHALFEN). Pigs were used in the model whose immune system was suppressed by infusion of sublethal doses of a lipopolysaccharide (LPS). In this way, a septic shock corresponding to humans is said to be
  • Germ density or colonization progressively decreases towards the tip of the catheter
  • test catheter containing ciprofloxacin The bacterial colonization of the test catheter containing ciprofloxacin is significantly lower compared to the control catheter free of active substance, except for the area of the catheter tip (see Table 3).
  • V dist catheter tip
  • V prox 5 cm
  • middle 10 cm
  • skin 15 cm

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  • Pharmacology & Pharmacy (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oncology (AREA)
  • Communicable Diseases (AREA)
  • Materials For Medical Uses (AREA)
EP99914501A 1998-03-20 1999-03-10 Formkörper aus wirkstoffhaltigen thermoplastischen polyurethanen Ceased EP1067974A1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19812160 1998-03-20
DE19812160A DE19812160C1 (de) 1998-03-20 1998-03-20 Formkörper aus wirkstoffhaltigen thermoplastischen Polyurethanen
PCT/EP1999/001536 WO1999048542A1 (de) 1998-03-20 1999-03-10 Formkörper aus wirkstoffhaltigen thermoplastischen polyurethanen

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EP1067974A1 true EP1067974A1 (de) 2001-01-17

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EP99914501A Ceased EP1067974A1 (de) 1998-03-20 1999-03-10 Formkörper aus wirkstoffhaltigen thermoplastischen polyurethanen

Country Status (12)

Country Link
US (1) US6723333B1 (enExample)
EP (1) EP1067974A1 (enExample)
JP (1) JP2002507457A (enExample)
KR (1) KR20010042020A (enExample)
CN (1) CN1191868C (enExample)
AU (1) AU737881B2 (enExample)
CA (1) CA2324365C (enExample)
DE (1) DE19812160C1 (enExample)
IL (1) IL137896A0 (enExample)
NZ (1) NZ506969A (enExample)
PL (1) PL193574B1 (enExample)
WO (1) WO1999048542A1 (enExample)

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DE10020163B4 (de) 2000-04-25 2007-05-31 Bayer Materialscience Ag Aliphatische thermoplastische Polyurethane und ihre Verwendung
US6475522B1 (en) * 2000-08-30 2002-11-05 Hammond Group, Inc. Synthetic polymer compositions containing antibiotics as antidegradants
ATE337804T1 (de) 2000-11-21 2006-09-15 Schering Ag Röhrenförmige gefässimplantate (stents) sowie verfahren zu deren herstellung
JP4199485B2 (ja) * 2002-06-07 2008-12-17 久光製薬株式会社 貼付剤
SI1594500T1 (sl) * 2003-02-10 2011-02-28 Bayer Schering Pharma Ag Zdravljenje bakterijskih bolezni dihalnih organov z lokalno aplikacijo fluorokinolonov
CN1305534C (zh) * 2003-10-16 2007-03-21 华南理工大学 聚氨脂医用抗感染介入导管的制备方法
DE102004054040A1 (de) * 2004-11-05 2006-05-11 Bayer Innovation Gmbh Wirkstoffhaltige Silikonelastomere
DE102005028056A1 (de) * 2005-06-16 2006-12-21 Basf Ag Thermoplastisches Polyurethan enthaltend Isocyanat
DE102005048132A1 (de) * 2005-10-06 2007-04-12 Bayer Innovation Gmbh Verfahren zur Herstellung antimikrobieller Kunststoffzusammensetzungen
DE102006012991A1 (de) 2006-03-22 2007-10-11 Bayer Innovation Gmbh Verfahren und Vorrichtung zum optischen Auslesen von Informationen
DE102006020644A1 (de) * 2006-04-28 2007-10-31 Bayer Innovation Gmbh Antiseptikahaltige Silikonelastomere
DE102007006761A1 (de) * 2007-02-12 2008-08-14 Bayer Innovation Gmbh Teilneutralisierte Wirkstoffe enthaltende Polymerformmassen
DE102009025293A1 (de) 2009-06-15 2010-12-16 Adolf Pfaff & Dr. Karl-Friedrich Reichenbach GbR (vertretungsberechtigter Gesellschafter: Adolf Pfaff, 79183 Waldkirch) Radioopake Formgedächtnis-Polymere
US11033624B2 (en) * 2010-06-02 2021-06-15 Novaflux Inc. Medical item for prevention and treatment of ear infection
US8747883B2 (en) 2010-06-02 2014-06-10 Princeton Trade & Technology, Inc. Medical item for long term drug release
US10285865B2 (en) 2014-05-02 2019-05-14 Novaflux Inc. Drug-releasing device usable in mucosal body cavities
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Also Published As

Publication number Publication date
IL137896A0 (en) 2001-10-31
HK1036599A1 (en) 2002-01-11
PL193574B1 (pl) 2007-02-28
US6723333B1 (en) 2004-04-20
AU737881B2 (en) 2001-09-06
CA2324365A1 (en) 1999-09-30
AU3329899A (en) 1999-10-18
DE19812160C1 (de) 1999-07-08
WO1999048542A1 (de) 1999-09-30
NZ506969A (en) 2003-07-25
JP2002507457A (ja) 2002-03-12
KR20010042020A (ko) 2001-05-25
PL342952A1 (en) 2001-07-16
CN1191868C (zh) 2005-03-09
CN1293579A (zh) 2001-05-02
CA2324365C (en) 2009-01-20

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