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mm mm mum um 115:011116151113" lllll ||||| lllilllll ||||| 1|! United States Patent [191 [11] Patent Number: 5,565,443 Lanquetin et al. [45] Date of Patent: Oct. 15, 1996 [54] SUBCUTANEOUS IMPLANTS BASED ON [58] Field of Search ................................... .. 514/169, 170, NORMEGESTROL DERIVATIVES 514/177, 178, 179, 182; 424/422, 423, 424, 425, 426, 484, 485, 486, 487, 488 [75] Inventors: Michel Lanquetin, La Trinite; Jean-Louis Thomas, [56] References Cited Charentron-le-Pont; Jacques Paris, U.S. PATENT DOCUMENTS Nice, all of France; Elsimar Coutinho, Salvador Bahia, Brazil 4,147,783 4/1979 van der Vies ......................... .. 424/243 4,172,132 10/1979 Draper et a1. .... .. 424/243 [73] Assignee: Laboratoire Theramex S.A., Monaco 4,456,601 6/1984 Toth et a1. .... .. 424/241 4,544,555 10/1985 Gastaud ......... .. 260/3974 [21] Appl. No.: 244,098 5,223,492 6/1993 Nasraoui et a1. ..................... .. 514/172 [22] PCT Filed: Sep. 17, 1993 OTHER PUBLICATIONS [86] PCT No.: PCT/FR93/00900 Nash et al “Steroid Release From Silastic Capsules and Rods” Contraception Oct. 1978, vol. 18, No. 4, pp. 367—394. §3‘71 Date: Jul. 6, 1994 Metzker “One Year Contraception with a Single Subdermal Implant Containing Nornegestrol Acetate” Contraception § 102(e) Date: May 17, 1994 vol. 47, pp. 97-105. [87] PCT Pub. No.: W094/06437 Primary Examiner—Nathan M. Nutter PCT Pub. Date: Mar. 31, 1994 Attorney, Agent, or Firm-Biennan and Muserlian [30] Foreign Application Priority Data [57] ABSTRACT Sep. 21, 1992 [FR] France ................................. .. 92 11422 Subcutaneous implant for preventing conception for at least one year in women comprising an amount effect to prevent [51] Int. Cl.6 ................................................... .. A61K 31/56 conception without suppressing intermontly bleeding of a [52] US. Cl. ........................ .. 514/169; 514/170; 514/177; steroid compound of formula I or formula H and a physi 514/178; 514/179; 514/182; 424/422; 424/423; ologically-tolerable pharmaceutical carrier. 424/424; 424/425; 424/426; 424/484; 424/485; 424/486; 424/487; 424/488 12 Claims, 5 Drawing Sheets US. Patent Oct. 15, 1996 Sheet 1 of 5 5,565,443 024 6 8 l0 l2 MONTHS MONTHS F 1 G. | A F I G. | B awmso C: 3%@50 _.EH E m m a mm m H m m H a a WM m WMM WWW’ WM a H H e o 2 4 e 8 IO l2 MONTHS MONTHS F l G. | C F l G. ID US. Patent Sheet 2 of 5 5,565,443 60 50 40? O x 30 20 O / INCLUSION MONTH\\\\\\\\\\\ I2 MEAN=56,26 ES=l,l4 MEAN=57,34 ES=I,I7 FIG. 2A 120* no I00 0, 90 I E 80 E 70 60% 50 \\\\\\\\\\\\‘ SY ST OLIC DIA SYSTOLIC DIASTOLIC INCLUSIO MONTH 12 FIG.2B U.S. Patent Oct. 15, 1996 Sheet 3 of 5 5,565,443 Po M / V ______ /// // 7 30.0 Ew8642O PROGESTERONE (?g/ml) FIG. 3 US. Patent 0a. 15, 1996 Sheét 4 0f 5 5,565,443 q — 9mm N __ w.m - wmm 0mm1 COM 0mm OQN Ovm. ONN OON US. Patent Oct. 15, 1996 Sheet 5 0f 5 5,565,443 wP<JDwnZOZmQ+ wMO_m m><o w 0.9m _ mvm 0mml 0Q 000. LOmN 0mm 0% 8m oow 09m1 5,565,443 1 2 SUBCUTANEOUS [MPLANTS BASED ON Among the implants which utilize hydrophobic materials NORMEGESTROL DERIVATIVES it may be cited: the implants of container type prepared from polydim This invention relates to novel compositions endowed ethyl siloxanes such as for example SILASTIC® with progestative action and the processes for their produc (medical grade of dimethylpolysiloxane made by Dow tion. Corning) produced by the company Dow Coming. This It has more particularly as a subject matter novel com kind of implant is shown in the form of a tube having positions intended to insure protracted contraception. an external diameter comprised between 2 and 4 mm Speci?cally it has as a subject matter, a preparation in the and having a thickness of about 0.4 mm. The portions form of a subcutaneous implant containing an effective of tubing are cut at the selected lengths as a function of amount of a derivative of 3-substituted 6-methyl 17ot-OR1 the amount of nor pregnadiem'c compound which is 20-oxo 19-nor pregna 4,6-dien selected from the group ' desirably incorporated. The ends of these portions of consisting of tube are closed using a glue of medical quality also sold a) 3,20-dioxo 6-methyl l7ot-OR1 l9-nor pregna 4,6-diens by the company Dow Coming and which belongs to the of general formula I group of silicones RTV (Room Temperature Vulcaniz ing). CH3 (1) The amount of nor pregnadienic compound of formulae 1, II or III incorporated in the portion of the tube, ranges from 30 to 80 mg and preferably from 45 to 65 mg. This content of active ingredient is namely determined by the granulo 20 metric properties of the active ingredient which may be micronized or microcristallized and by its physico-chemical characteristics (molecular weight, solubility, diffusibility, partition index). The way of incorporation of the active CH3 ingredient may be done either in the solid state or dispersed wherein R1 is a hydrogen, or the acyl moiety of an organic 25 in a biologically acceptable and inert carrier. aliphatic, aromatic or cyclanic carboxylic acid having from The manner of preparation and isolation of the microc 2 to 16 carbon atoms rystallized forms of the compounds of this invention have b) the substituted 3-OR2 6-methyl l'lot-OR1 20-oxo already been described in the french patent application l9-nor pregna 4,6-diens of general formula II 2.668.945 in the name of the applicant. 30 implants of the container type produced from ethylene/ CH3 (II) vinyl acetate copolymers such as for example the material sold under the Trade Name ELVAX® MD 40 (ethylene-vinyl acetate copolymer) by the company 35 DUPONT de NEMOURS. This kind of implant has already been utilized for the intra uterine device Progestasert® containing an hormonal preparation R20 made by Alza, but contrarily to Progestasert in the case of the implants of this invention, the active ingredient CH3 is introduced in a solid form. wherein R1 has the above-given de?nitions and R2 is a hydrogen, the acyl moiety of carboxylic acid, or an alkyl implants of the matrix type, produced from polydimethyl radical having from 1 to 8 carbon atoms and siloxanes. This kind of implant has already been used in man (Nash, Robertson and cowork—Contraception c) the 6-methyl l7ot-OR1 19-nor pregna 4,6-diens of 18 (1978) p.367). This implant of the matrix type general formula III } 45 namely presents the inconvenient of a high rate of CH; (111) release of the active ingredient. In order to compensate this disadvantage, the implants according to this inven tion have to be produced in introducing one of the derivatives according to the formulae I, II or III sus 50 pended in a hydrophilic liquid in which the active ingredient is insoluble. This suspension is admixed to the poly dimethyl siloxanes then the whole mass is cross-linked before to proceed to the extrusion of the elastomer in the form of a cylindrical thread having the wherein R1 is de?ned as above R3 and R4 together form I choosen measures. This process allows the obtention of either an oximido grouping of formula =N-—~O—R5 kinetics of release of zero order and no longer as a wherein R5 is a hydrogen, a lower alkyl or a carboxyalkyl function of the square root of time such as the matrix group or an alkylenedioxy grouping which may be substi cited by Nash and co-workers. tuted or each are a lower alkoxy radical in admixture or implants of the matrix type produced from ethylene-vinyl conjunction with a carrier and with a biologically acceptable acetate copolymers. In this case the implant is prepared diluent. by casting. Due to its monolithic structure, this implant The implants according to this inventions are made of releases the active ingredient along a kinetic of the type polymeric materials (hydrophobic, hydrophilic or biode square root of the time. The partial coating using a gradable) used as vectors of pharmacologically-active com membran which serves to control the release from the pounds previously included in the formulae I, II or III. matrix, may be realized either with an EVA polymer The implants namely are of the container type or of the having a lower concentration of vinyl acetate or in matrix type. introducing the matrix in a tube of polydimethyl silox 5,565,443 3 4 ane (type SILASTIC) to obtain release curves of zero extend over about 6 months, frequently joined with signi? order. cant side-effects. Among the implants using hydrophilic materials it may be This is the reason why the experimenters have been cited: coming to the implants in biocompatible polymers which are implants of matrix type produced from hydroxyethyl 5 inserted either in the uterine cavity (PROGESTASERT(R)) polymethacrylates such as for example HYDRON® (a or in the subcutaneous tissues (implants). gel based on hydroxyethyl polymethacrylate) manufac It thus has been experienced implants containing numer tured by the company HYDRON HED SCIENCES. ous steroidal active ingredients with progestational activity, This kind of implant is produced by polymeration in such as norgestrienone, norethindrone or levonorgestrol. alcohol followed by a cross-linking by means of eth~ 10 However with these products, it is necessary for obtaining ylene glycol dimethylacrylate.