Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K49/00—Preparations for testing in vivo
  • A61K49/06—Nuclear magnetic resonance [NMR] contrast preparations; Magnetic resonance imaging [MRI] contrast preparations

Definitions

• the invention relates to new contrast media for MR diagnostics.
• EP-A-0303555 discloses complexes of ethanolamine phosphoric acid with iron (III) and manganese (II) which are intended for prophylaxis and therapy.
• EP-A-0173163 proposes the use of metal complexes with phosphonylorganophosphates for MR diagnostics.
• EP-A-0290047 describes measurement tall complexes of dipyridoxyl phosphoric acids as MR contrast agents.
• EP-A 0284549 proposes the use of magnetic liquids to increase the relaxivity in MR-diagnostic examinations. Due to the strongly relaxing effect of the superparamagnetic particles contained in the magnetic liquids, a so-called negative contrast can also be achieved by signal cancellation.
• EP-A 0190676 discloses all-cis-1,3,5-triamino-2,4,6-cyclohexanetriol derivatives which are suitable for complexing metal cations, in particular iron (III).
• the object of the present invention is to provide new contrast media for MR diagnostics, which are characterized by high complex stability, good water solubility at physiological pH values, strong relaxivity and by a pronounced organ specificity combined with reduced side effects and distinguish faster excretion.
• the invention relates to the use of complexes of the compounds of the general formula I,
• Rl, R2, R3, R4, R5 and R6 are the same or different and
• R7 represents hydrogen, COOH and PO (OH), with paramagnetic transition metal cations and their salts with cations of strong bases for the production of agents for MR diagnostics.
• R7 represent hydrogen, COOH and PO (OH).
• R2, R4 and R6 C (0) CH, C (0) C H, CH COOH, CH CH COOH, CH P (0) (OH),
• Suitable transition metal cations are the cations of the transition metals of atomic numbers 21 to 29, 42 and 44 and the cations of the lanthanide elements of atomic numbers 57 to 70, gadolinium being preferred by the lanthanide elements.
• iron (III) -all-cis-1,3,5-tris is particularly preferred.
• the first preferred complex shows a longitudinal relaxivity TR of 2J058 [sec mmol] and a transverse relaxivity TR of 1.945 [sec mmol].
• the second complex shows values of 4,113 (TR) and 4,340 (TR).
• the sodium and N-methylglucamine salts are preferred as salts of the complexes used according to the invention.
• Si show a strong relaxivity with regard to both T1 and T2, so that they can also be used for signal extinction similar to magnetite particles.
• Contrast agents for MR diagnostics contain one or more of the complexes of the general formula I and, if desired, customary additives.
• the complexes are prepared in a manner known per se by adding salts of paramagnetic transition metal ions in water and / or alcohol, such as
• Methanol, ethanol, etc. dissolves and, if necessary, with the appropriate amount of ligand, while stirring at 50 ° C. to 120 ° C., until the reaction is complete. If the complex formed is insoluble in the solvent used, it crystallizes and can be filtered off. If the complex is soluble in the solvent used, it can be isolated by evaporating the solution to dryness. The complex compound obtained is then dissolved or suspended in water and mixed with the desired inorganic or organic base until the neutral point is reached. After filtration of undissolved portions, the solution is evaporated and the desired complex salt is obtained as residue. The salts of the complexes are obtained, for example, by reaction with strong bases.
• the new contrast media are prepared in a manner known per se by dissolving the complexes and / or their salts in water or physiological salt solution and, if desired, additives customary in galenics, such as, for example, physiologically compatible buffer solutions (for example sodium dihydro gene phosphate solution), albumin and the like, and the solution is sterilized.
• physiologically compatible buffer solutions for example sodium dihydro gene phosphate solution
• albumin for example, albumin and the like
• the solutions can be filled as such into ampoules or freeze-dried to a soluble powder.
• the aqueous solutions are adjusted to a pH with sufficient local tissue tolerance, for example to a pH of 7 to 9.
• the aqueous solutions are administered orally or parenterally, in particular intravascularly.
• aqueous solutions which contain the paramagnetic complex in a concentration of 30 to 200 mmol / liter. Approximately 1 to 100 ⁇ mol of the complex is administered per kg body weight per application. For an adult, a dose of 1 to 50 mmol proves to be appropriate for IV use.

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• Health & Medical Sciences (AREA)
• Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
• Radiology & Medical Imaging (AREA)
• Epidemiology (AREA)
• Life Sciences & Earth Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)

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• 1990
  • 1990-01-09 CH CH6290A patent/CH679742A5/de not_active IP Right Cessation
• 1991
  • 1991-01-08 JP JP50207891A patent/JPH05504343A/ja active Pending
  • 1991-01-08 AU AU70447/91A patent/AU7044791A/en not_active Abandoned
  • 1991-01-08 WO PCT/EP1991/000020 patent/WO1991010454A1/de not_active Application Discontinuation
  • 1991-01-08 EP EP19910901732 patent/EP0510030A1/de not_active Withdrawn

Non-Patent Citations (1)

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