Method for preparing a pharmaceutical composition in the form of microparticles
First Claim
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1. A method for preparing a pharmaceutical composition which is aimed at providing a prolonged and a controlled release of medicamentous substance, which is obtained in the form of microparticles of a copolymer of lactic and glycolic acids, and which incorporates, as the active substance, the pamoate, tannate, stearate or palmitate salt of a natural or of a synthetic peptide, characterized in that:
- a) the selected copolymer and active substance, both present in the form of microparticles whose average grain size is below approximately 200 microns, are dry-mixed in relative amounts such that the active substance is present in a proportion of about 0.1-15% by weight;
b) the powdered mixture thus obtained is compressed and is heated up to approximately 80°
C.;
c) the precompressed and preheated mixture is subjected to an extrusion at a temperature of between approximately 80° and
100°
C.; and
d) the product resulting from the extrusion is pulverized at low temperature and then, the microparticles having a grain size below approximately 200 microns are selected and finally collected.
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Abstract
A method for preparing a pharmaceutical composition in the form of microparticles, the composition thus obtained and its use for preparing injectable suspensions.
95 Citations
23 Claims
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1. A method for preparing a pharmaceutical composition which is aimed at providing a prolonged and a controlled release of medicamentous substance, which is obtained in the form of microparticles of a copolymer of lactic and glycolic acids, and which incorporates, as the active substance, the pamoate, tannate, stearate or palmitate salt of a natural or of a synthetic peptide, characterized in that:
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a) the selected copolymer and active substance, both present in the form of microparticles whose average grain size is below approximately 200 microns, are dry-mixed in relative amounts such that the active substance is present in a proportion of about 0.1-15% by weight; b) the powdered mixture thus obtained is compressed and is heated up to approximately 80°
C.;c) the precompressed and preheated mixture is subjected to an extrusion at a temperature of between approximately 80° and
100°
C.; andd) the product resulting from the extrusion is pulverized at low temperature and then, the microparticles having a grain size below approximately 200 microns are selected and finally collected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 20, 21)
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10. A method for preparing a pharmaceutical composition which provides a prolonged and controlled release of an active substance, which comprises:
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a) mixing microparticles of a copolymer of lactic and glycolic acids with microparticles of an active substance of an insoluble salt of a natural or synthetic peptide comprising 3 to 45 amino acids for a sufficient time to form a homogenous mixture containing about 0.1 to 15% by weight of the active substance, each of said microparticles having an average grain size of below approximately 200 microns; and b) precompressing and preheating the mixture prior to extruding the precompressed and preheated mixture at a temperature of between approximately 80° and
100°
C. to form a product for use as said pharmaceutical composition. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 22, 23)
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Specification