Implanted Device

Abstract

Disclosed is an implanted device, comprising a device base body and an active drug, wherein the device base body is pure zinc and/or a zinc alloy, the zinc content in the device base body is 0.1-100%, and the active drug comprises anti-allergic drugs. After the implantation of the implanted device into the human body, the surrounding tissues of the implant would not have a clear hypersensitive reaction due to the presence of the anti-allergic drugs, and the implanted device can be used to be implanted into the body for supporting organ chambers, to fill the hollow chambers of the organs and tissues or as orthopaedic implants etc.

Claims

1. An implanted device, comprising a device substrate and an active drug, wherein the device substrate is pure zinc and/or a zinc alloy; the device substrate contains 0.1 to 100 percent of zinc; and the active drug comprises an anti-allergic drug.

2. The implanted device according to claim 1, wherein the implanted device further comprises a zinc complexing agent; wherein the zinc complexing agent and the pure zinc or the zinc alloy in the device substrate form a complex in body fluid.

3. The implanted device according to claim 2, wherein the zinc complexing agent contains at least one coordination group; the coordination group is selected from the group consisting of hydroxyl on polycyclic aromatic hydrocarbon, sulfydryl, amino, an aromatic heterocyclic group, nitroso, carbonyl, sulpho, a phosphate group and an organic phosphorus group; the hydroxyl on the polycyclic aromatic hydrocarbon is a phenolic hydroxyl; and the aromatic heterocyclic group is selected from the group consisting of furyl, pyrryl, imidazolyl, triazolyl, thienyl, thiazolyl, pyridyl, a pyridone group, pyranyl, a pyrone group, pyrimidyl, pyridazinyl, pyrazinyl, quinolyl, isoquinolyl, phthalazinyl, pteridyl, indolyl, purinyl and a phenanthroline group.

4. The implanted device according to claim 3, wherein the zinc complexing agent is selected from the group consisting of: a hydroxyl-on-polycyclic aromatic hydrocarbon-containing polydentate ligand including 8-hydroxyquinoline, 8-hydroxyquinaldine, 4,5-dioxybenzene-1,3-sodium disulfonate, 4-[3,5-bis-hydroxyphenyl-1H-1,2,4-triazole]-benzoic acid and 1-(2-pyridine azo)-2-naphthol; a sulfydryl-containing complexing agent including 8-mercaptoquinoline, mercaptoacetic acid, propyl disulfide and 5-methyl-2-mercapto mercaptobenzoate; an amido-containing complexing agent including ethidene diamine, triethylene tetramine, ethylenediamine tetraacetic acid, ethylene diamine tetraacetic acid tetrasodium, triethylene tetramine and N-(2-ethoxyl)ethidene diamine-N,N,N-triacetic acid or N-(5-[[4-[[[5-(acetyl hydroxylamine)amyl]ammonia]-1,4-dioxobutyl]hydroxylamine]amyl]-N-(5-amido amyl)-N-hydroxyl succinamide: an aromatic heterocyclic group-containing complexing agent including phenanthroline, dipyridyl, porphyrin, porphin, chlorophyll, hemoglobin or 1,2-dimethyl-3-hydroxyl-4-pyridone; a nitroso-containing polydentate ligand including 1-nitroso-2-naphthol or 1-nitroso-2-naphthol-6-sodium sulfonate; a sulpho-containing polydentate ligand including sulfosalicylic acid and 8-hydroxyquinoline-5-sulphonic acid; a phosphate group-containing polydentate ligand including pyrophosphoric acid, tripolyphosphoric acid, hexametaphosphoric acid, polyphosphoric acid, sodium pyrophosphate, sodium hexametaphosphate or ammonium polyphosphate; an organic phosphorus-containing complexing agent including potassium diethylenetriamine pentamethylene phosphonate or sodium ethylenediamine tetramethylene phosphonate; a carbonyl-containing ligand including carboxylic acid and salt thereof, anhydride, ester, amide, polycarboxylic acid or polyanhydride, and further the carbonyl-containing ligand including gluconic acid, oxalic acid, tartaric acid, malic acid, oxaloacetic acid, fumaric acid, maleic acid, citric acid, nitrilotriacetic acid, diethylene triamine pentacarboxylic acid, alginic acid, glutamic acid, aspartic acid, ornithine, lysine, 1,2-diaminocyctohexane-N,N,N,N-tetraacetic acid, potassium citrate, calcium citrate, monoglyceride citrate, acetylsalicylic acid, sulpho salicylamide, polyaspartic acid, polyglutamic acid, poly-ornithine, polylysine or polymaleic anhydride.

5. The implanted device according to claim 1, wherein the anti-allergic drug is at least one of an antihistamine type anti-allergic drug, an antileukotriens drug, a mast cell membrane stabilizer, a glucocorticoids anti-allergic drug or an immunoregulation anti-allergic drug.

6. The implanted device according to claim 5, wherein the anti-allergic drug is selected from the group consisting of chlortrimeton, diphenhydramine, promethazine hydrochloride, cetirizine, clarityne, mizolastine, ebastine, astemizole, terfenadine, desloratadine, fexofenadine, cyproheptadine, ketotifen, levocetirizine, meclizine, efletirizine, carebastine, azelastine, decloxizine, chlorcyclizine, amlexanox, acrivastine, azatadine, mequitazine, levocabastine, setastine, sequifenadine, deptropine, pizotifen, pyrilamine, ranitidine, emedastine, epinastine, promethazine, montelukast, zafirlukast, tomelukast, zileuton, amlexanox, ibudilast, pemirolast, doxepin verlukast, docebenone, sodium cromoglycate, sodium hydroxypropylcromate, nedocromil sodium, tranilast, tiaramide, repirinast, bufrolin, zaprinast, tazanolast, ozagrel, repirinast, dexamethasone, methylprednisolone, hydrocortisone, triamcinolone acetonide, corticosteroids, vitamin C, calcium, coenzyme Q10 or trypsin chymotrypsin.

7. The implanted device according to claim 1, wherein the content of the anti-allergic drug on the surface of the device substrate ranges from 10 to 500 ug/cm.sup.2, further 100 to 300 ug/cm.sup.2.

8. The implanted device according to claim 1, wherein the active drug further comprises at least one of an anti-restenosis drug, an anti-hyperplasia drug, an antiplatelet drug or an anti-inflammatory reaction drug.

9. The implanted device according to claim 1 wherein the active drug is in contact with the device substrate in at least one of the following manners: the active drug at least partially covers the surface of the device substrate; or the device substrate has micro pores, and the active drug is arranged in the micro pores of the device substrate; or the device substrate is provided with a gap, a hole or a groove, and the active drug is arranged in the gap, the hole or the groove of the device substrate; or the device substrate has an inner cavity, and the inner cavity of the device substrate is filled with the active drug.

10. The implanted device according to claim 9, wherein the active drug exists in the form of a coating; and the coating has a thickness in the range of 2 to 50 m, further 5 to 25 m.

11. The implanted device according to claim 10, wherein the coating further comprises a polymer carrier; the polymer carrier is a degradable polymer, and the degradable polymer is formed by physically blending one or several of polylactic acid, poly glycolic acid, polyethylene succinate), poly(beta-hydroxybutyrate), polycaprolactone, polyethylene glycol adipate, a polylactic acid-glycolic acid copolymer or polypentanoate, or is formed by copolymerizing one or several of the polylactic acid, the polyglycolic acid, the poly(ethylene succinate), the poly(beta-hydroxybutyrate), the polycaprolactone, the polyethylene glycol adipate, the polylactic acid-glycollic acid copolymer or the polypentanoate. Or the polymer carrier is a nondegradable polymer, and the nondegradable polymer is formed by physically blending one or several of polyurethane, polycarbonate, poly(methyl methacrylate), polystyrene, polybutylene or poly(butyl methacrylate), or is formed by copolymerizing one or several of the polyurethane, the polycarbonate, the poly(methyl methacrylate), the polystyrene, the polybutylene or the poly(butyl methacrylate). Or the polymer carrier is formed by physically blending one or several of monomers of the degradable polymers and monomers of the nondegradable polymers, or is formed by copolymerizing one or several of the monomers of the degradable polymers and the monomers of the nondegradable polymers,

12. The implanted device according to claim 10, wherein a mass ratio of the polymer carrier to the active drug ranges from 50:1-1:20, further 10:1-1:10.

13. The implanted device according to claim 1, wherein the implanted device is a stent, an occluder, an orthopedic implant, a dental implant, a suture line or a bolt: the stent is a vascular stent, a tracheal stent, an esophageal stent, a urethral stent, an intestinal stent or a biliary stent; and the orthopedic implant is a fixing screw, a fixing rivet or a bone plate.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG. 1 is a sensitization pathological section of a tissue around a vascular stent of Contrast 1 after the stent has been implanted into a porcine coronary blood vessel for 6 months:

[0027] FIG. 2 is a sensitization pathological section of a tissue around a vascular stent of Contrast 2 after the stent has been implanted into a porcine coronary blood vessel for 6 months;

[0028] FIG. 3 is a pathological section of a tissue around a vascular stent of Embodiment 1 after the stent has been implanted into a porcine coronary blood vessel for 6 months;

[0029] FIG. 4 is a pathological section of a tissue around a vascular stent of Embodiment 2 after the stent has been implanted into a porcine coronary blood vessel for 6 months:

[0030] FIG. 5 is a pathological section of a tissue around a vascular stent of Embodiment 3 after the stent has been implanted into a porcine coronary blood vessel for 1 month;

[0031] FIG. 6 is a pathological section of a tissue around a vascular stent of Embodiment 4 after the stent has been implanted into a porcine coronary blood vessel for 3 months;

[0032] FIG. 7 is a pathological section of a tissue around a vascular stent of Embodiment 5 after the stent has been implanted into a porcine coronary blood vessel for 6 months;

[0033] FIG. 8 is a pathological section of a tissue around a vascular stent of Embodiment 6 after the stent has been implanted into a porcine coronary blood vessel for 6 months;

[0034] FIG. 9 is a pathological section of a tissue around a vascular stent of Embodiment 7 after the stent has been implanted into a porcine coronary blood vessel for 1 month:

[0035] FIG. 10 is a pathological section of a tissue around a vascular stent of Embodiment 8 after the stent has been implanted into a porcine coronary blood vessel for 3 months;

[0036] FIG. 11 is a pathological section of a tissue around a vascular stent of Embodiment 9 after the stent has been implanted into a porcine coronary blood vessel for 6 months.

DETAILED DESCRIPTION OF THE INVENTION

[0037] For the purpose of making objectives, technical solutions and advantages of the present application clearer, a further detailed description will be made below to the present application in conjunction with accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely explanatory of the present application, but not intended to limit the present application.

[0038] Unless otherwise specified, all technical and scientific terms used in this text are the same as meanings of general understandings of technical persons skilled in the art of the present application. The terms used in the description are merely descriptive of the objectives of the specific embodiments, but not intended to limit the present application.

Contrast 1

[0039] A vascular stent which takes pure zinc as a substrate is implanted into a porcine coronary blood vessel, and the device substrate of the vascular stent contains 100 percent of zinc. After 6 months, the stent and vascular tissue where the stent is implanted are taken out, and the vascular tissue is subjected to pathology observation.

[0040] With reference to FIG. 1, a pathological section shows that the vascular tissue around the vascular stent of Contrast 1 generates a large number of eosinophilic granulocytes, that is to say, the pure zinc-based vascular stent of this contrast has an obvious sensitization effect on the implantation tissue.

Contrast 2

[0041] A vascular stent which takes an iron-zinc alloy as a substrate is implanted into a porcine coronary blood vessel, and the device substrate of the vascular stent contains 70 percent of zinc, 25 percent of iron, 3.5 percent of magnesium, 0.5 percent of calcium, 0.2 percent of copper and the balance of inclusion elements. After 6 months, the stent and vascular tissue where the stent is implanted are taken out, and the vascular tissue is subjected to pathology observation.

[0042] With reference to FIG. 2, a pathological section shows that the vascular tissue around the vascular stent of Contrast 2 generates a large number of eosinophilic granulocytes. that is to say, the iron-zinc alloy vascular stent of this contrast has an obvious sensitization effect on the implantation tissue.

Embodiment 1

[0043] A vascular stent has an iron-zinc alloy as a substrate, and the device substrate of the vascular stent contains 95 percent of zinc, 4.5 percent of iron and total 0.5 percent of inclusion elements except for the zinc and the iron. The surface of the stent is coated with a mixture of polylactic acid. dexamethasone and gluconic acid by dripping; after the surface is dried, the vascular stent of Embodiment 1 is obtained; a coating on the surface of the stent is 2 m in thickness, and the mass ratio of the polylactic acid to the dexamethasone in the coating is 2:1; and the content of the dexamethasone drug on the surface of the device substrate is 100 ug/cm.sup.2. The vascular stent of this embodiment is implanted into a porcine coronary blood vessel. After 6 months, the stent and vascular tissue where the stent is implanted are taken out, and the vascular tissue is subjected to pathology observation.

[0044] With reference to FIG. 3, a pathological section shows that the vascular tissue around the vascular stent of this embodiment does not generate eosinophilic granulocytes, that is to say. the vascular stent of this embodiment has no sensitization effect on the implantation tissue.

[0045] The vascular stent of this embodiment contains the dexamethasone which serves as an anti-allergic drug and the gluconic acid which is capable of generating a complex together with the zinc; after the vascular stent is implanted into the vascular tissue, the dexamethasone inhibits the sensitization effect of the zinc alloy in the device substrate of the vascular stent on the vascular tissue through its pharmaceutical effect. In addition, the gluconic acid is in complexation with zinc ions which are corrosion products of the iron-zinc alloy, thereby reducing the number of free zinc ions and further reducing the sensitization risk of the implant.

Embodiment 2

[0046] A stent has pure zinc as a substrate, and the device substrate of the stent contains 99.95 percent of zinc and the balance of inclusion elements. The surface is subjected to dip-coating in a mixture of polyglycolic acid, methylprednisolone, ethylene diamine tetraacetic acid tetrasodium and sirolimus; the mass ratio of three components in the mixture is 50:1:1 and a coating with the thickness of 25 m is obtained; after the coating is dried, the vascular stent of Embodiment 2 is obtained; and the content of the methylprednisolone drug on the surface of the device substrate is 200 ug/cm.sup.2. The vascular stent of this embodiment is implanted into a porcine coronary blood vessel. After 6 months, the stent and vascular tissue where the stent is implanted are taken out, and the vascular tissue is subjected to pathology observation.

[0047] With reference to FIG. 4, a pathological section shows that the vascular tissue around the vascular stent of this embodiment does not generate eosinophilic granulocytes, that is to say, the vascular stent of this embodiment has no sensitization effect on the implantation tissue.

[0048] The vascular stent of this embodiment contains the methylprednisolone which serves as an anti-allergic drug and ethylene diamine tetraacetic acid which is capable of generating a complex together with the zinc; after the vascular stent is implanted into the vascular tissue, the methylprednisolone inhibits the sensitization effect of the pure zinc in the device substrate of the vascular stent on the vascular tissue through its pharmaceutical effect. In addition, the ethylene diamine tetraacetic acid tetrasodium salt is in complexation with zinc ions which are corrosion products of the device substrate, thereby reducing the number of free zinc ions and further reducing the sensitization risk of the implant.

Embodiment 3

[0049] A galvanized iron-based stent is provided and the device substrate of the stent contains 1 percent of zinc, 98 percent of iron and the balance of inclusion elements. The surface of the device substrate is first coated with a solution containing polylactic acid-glycollic acid, hydrocortisone and acetylsalicylic acid via spraying, thus obtaining a coating with the thickness of 50 m: the mass ratio of the polylactic acid-glycollic acid to the hydrocortisone in the coating is 1:5; then the surface of the drug coating is coated with a polylactic acid coating layer with a thickness of 5 m, thus obtaining a vascular stent of Embodiment 3; and the content of the hydrocortisone drug on the surface of the device substrate is 300 ug/cm.sup.2. The vascular stent of this embodiment is implanted into a porcine coronary blood vessel. After 1 month, the stent and vascular tissue where the stent is implanted are taken out, and the vascular tissue is subjected to pathology observation.

[0050] With reference to FIG. 5, a pathological section shows that the vascular tissue around the vascular stent of this embodiment does not generate eosinophilic granulocytes, that is to say, the vascular stent of this embodiment has no sensitization effect on the implantation tissue.

[0051] The vascular stent of this embodiment contains the hydrocortisone which serves as an anti-allergic drug and the acetylsalicylic acid which is capable of generating a complex together with the zinc; after the vascular stent is implanted into the vascular tissue, the hydrocortisone inhibits the sensitization effect of the pure zinc in the device substrate of the vascular stent on the vascular tissue through its pharmaceutical effect. In addition, the acetylsalicylic acid is in complexation with zinc ions, thereby reducing the number of free zinc ions and further reducing the sensitization risk of the implant.

Embodiment 4

[0052] A vascular stent with a groove in the surface is provided, the device substrate of the stent is an alloy containing zinc, magnesium and iron, and contains 40 percent of zinc, 50 percent of iron, 9.5 percent of magnesium and the balance of inclusion elements. The outer surface of the stent and the inside of the groove are coated with a mixture of polystyrene, 8-hydroxyquinoline and levocetirizine by dripping, thus obtaining a coating with the thickness of 25 m; the mass ratio of the polystyrene to the levocetirizine in the coating is 1:1, and a vascular stent of Embodiment 4 is obtained; and the average content of the levocetirizine drug on the surface of the device substrate is 50 ug/cm.sup.2. The vascular stent of this embodiment is implanted into a porcine coronary blood vessel. After 3 months. the stent and vascular tissue where the stent is implanted are taken out, and the vascular tissue is subjected to pathology observation.

[0053] With reference to FIG. 6, a pathological section shows that the vascular tissue around the vascular stent of this embodiment does not generate eosinophilic granulocytes, that is to say, the vascular stent of this embodiment has no sensitization effect on the implantation tissue.

[0054] The vascular stent of this embodiment contains the levocetirizine which serves as an anti-allergic drug and the 8-hydroxyquinoline which is capable of generating a complex together with the zinc; after the vascular stent is implanted into the vascular tissue, the levocetirizine inhibits the sensitization effect of the zinc alloy in the device substrate of the vascular stent on the vascular tissue by its pharmaceutical effect. In addition, the 8-hydroxyquinoline is in complexation with zinc ions, thereby reducing the number of free zinc ions and further reducing the sensitization risk of the implant.

Embodiment 5

[0055] A zinc-manganese-magnesium alloy vascular stent is provided, its device substrate contains 20 percent of zinc, 5 percent of manganese and 75 percent of magnesium. Multiple gaps are distributed on the surface of the stent, and are filled with dexamethasone. thus obtaining the vascular stent of Embodiment 5; and the content of the dexamethasone drug on the surface of the device substrate is 500 ug/cm.sup.2. The vascular stent of this embodiment is implanted into a porcine coronary blood vessel. After 6 months, the stent and vascular tissue where the stent is implanted are taken out, and the vascular tissue is subjected to pathology observation.

[0056] With reference to FIG. 7, a pathological section shows that the vascular tissue around the vascular stent of this embodiment does not generate obvious eosinophilic granulocytes, that is to say, the vascular stent of this embodiment has no obvious sensitization effect on the implantation tissue.

Embodiment 6

[0057] A galvanized iron-copper-calcium alloy stent is provided, and the device substrate of the stent contains 97 percent of iron, 1 percent of copper, 0.5 percent of calcium, 0.5 percent of zinc and the balance of inclusion elements. The surface of the stent is subjected to dip-coating in a mixture of polycarbonate and chlortrimeton, thus obtaining a coating with the thickness of 5 m; the mass ratio of the polycarbonate to the chlortrimeton in the coating is 1:20; and a vascular stent of Embodiment 6 is obtained; and the content of the chlortrimeton drug on the surface of the device substrate is 150 ug/cm.sup.2. The vascular stent of this embodiment is implanted into a porcine coronary blood vessel. After 6 months, the stent and vascular tissue where the stent is implanted are taken out, and the vascular tissue is subjected to pathology observation.

[0058] With reference to FIG. 8, a pathological section shows that the vascular tissue around the vascular stent of this embodiment only generates individual eosinophilic granulocytes, that is to say, the vascular stent of this embodiment has no obvious sensitization effect on the implantation tissue.

Embodiment 7

[0059] A stent which takes pure zinc as a substrate is provided, the device substrate of the stent contains 100 percent of zinc; part of the surface of the stent is coated with a mixture of polyglycolic acid, mizolastine and taxol using a brushing procedure, thus obtaining a coating with the thickness of 30 m; the mass ratio of the three components in the coating is 1:10:1, and a vascular stent of Embodiment 7 may be obtained; and the content of the mizolastine drug on the surface of the device substrate is 10 ug/cm.sup.2, The vascular stent of this embodiment is implanted into a porcine coronary blood vessel. After 1 month, the stent and vascular tissue where the stent is implanted are taken out, and the vascular tissue is subjected to pathology observation.

[0060] With reference to FIG. 9, a pathological section shows that the vascular tissue around the vascular stent of this embodiment does not generate obvious eosinophilic granulocytes, that is to say, the vascular stent of this embodiment has no obvious sensitization effect on the implantation tissue.

Embodiment 8

[0061] An iron-zinc alloy stent is provided, the device substrate of the stent contains 99.9 percent of iron and 0.1 percent of zinc. The surface of the stent is coated with dimercaprol, and then is dried, thus obtaining a vascular stent of Embodiment 8. The vascular stent of this embodiment is implanted into a porcine coronary blood vessel. After 3 months, the stent and vascular tissue where the stent is implanted are taken out, and the vascular tissue is subjected to pathology observation.

[0062] With reference to FIG. 10, a pathological section shows that the vascular tissue around the vascular stent of this embodiment does not generate obvious eosinophilic granulocytes, that is to say, the vascular stent of this embodiment has no obvious sensitization effect on the implantation tissue.

[0063] The vascular stent of this embodiment includes the dimercaprol which is capable of generating a complex together with zinc ions: after the vascular stent is implanted into the vascular tissue, the dimercaprol is in complexation with the zinc ions which are corrosion products of the zinc alloy, thereby reducing the concentration of free zinc ions, and no obvious sensitization reaction is caused in the tissue around the implant.

Embodiment 9

[0064] A stent which takes pure zinc as a substrate is provided, the device substrate of the stent contains 100 percent of zinc, The outer surface of the stent is rolled in trisodium citrate, thus obtaining a vascular stent of Embodiment 9; the surface of the vascular stent is a non-continuous citric acid coating with the average thickness of 10 m. The vascular stent of this embodiment is implanted into a porcine coronary blood vessel. After 6 months, the stent and a vascular tissue where the stent is implanted are taken out, and the vascular tissue is subjected to pathology observation.

[0065] With reference to FIG. 11, a pathological section shows that the vascular tissue around the vascular stent of this embodiment does not generate obvious eosinophilic granulocytes, that is to say, the vascular stent of this embodiment has no obvious sensitization effect on the implantation tissue.

[0066] The vascular stent of this embodiment includes the trisodium citrate which is capable of generating a complex together with zinc ions; after the vascular stent is implanted into the vascular tissue, the trisodium citrate is in complexation with the zinc ions which are corrosion products of the zinc alloy, thereby reducing the concentration of free zinc ions, and no obvious sensitization reaction is caused in the tissue around the implant,

[0067] In Embodiments 1 to 9, only the zinc-containing vascular stents are used to make a schematic description to specific implementation modes of the present application, and the technical solution provided by the present application also may be applied to other implanted devices, such as a stent, an occluder, an orthopedic implant, a dental implant, a suture line or a bolt. The stent can be a vascular stent, a tracheal stent an esophageal stent, a urethral stent, an intestinal stent or a biliary stent. The orthopedic implant can be a fixing screw, a fixing rivet or a bone plate.

[0068] A description is made above to the embodiments of the present application in conjunction with the drawings, but the present application is not limited to the above-mentioned specific implantation modes. The above-mentioned specific implementation modes are merely schematic, but not restrictive. An ordinary person skilled in the art further can make many implementation modes that shall all fall within the protection of the present application under the inspiration of the present application without departing from the purpose of the present application and the scope claimed in claims.