CN111991622B - 一种表面涂层改性的血管支架的制备方法 - Google Patents
一种表面涂层改性的血管支架的制备方法 Download PDFInfo
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Abstract
本发明公开了一种表面涂层改性的血管支架的制备方法,包括以下步骤:制备支架基体;将支架基体完全浸入到腐蚀液中,浸泡2‑5min;将支架基体放置在无水乙醇和氯化镁的水溶液中,在表面形成氧化镁基层;将支架基体浸没盐酸多巴胺溶液中沉积多巴胺层;在支架基体上制得聚合物层;将支架基体放置在镍溶液中,加热至70‑80℃,浸泡50‑60min;再将支架基体放置在硬脂酸乙醇溶液中,浸泡30‑40min中,制得疏水层;通过超声喷涂工艺,制得载药层,自然烘干后,得到血管支架。
Description
技术领域
本发明属于医疗器械技术领域,具体涉及一种表面涂层改性的血管支架的制备方法。
背景技术
血管支架是用于支撑人体内狭窄闭塞段血管,减少血管弹性回缩及再塑形,保持管腔血流通畅管状器件。血管支架的种类较多,包括聚合物类和金属类,镁合金血管支架具有可降解、支撑强度高等优点,但现有的镁合金支架在体内极易发生腐蚀,其降解速度过快,导致其在体内过早的失去支撑能力,难以满足服役要求。现有技术的镁合金支架多是在支架的表明涂覆单一的防腐层,防腐层与支架的结合强度低,在使用过程中,易脱落,不能较好的保护镁合金支架。
发明内容
本发明的目的在于:解决现有技术中的不足,提供一种表面涂层改性的血管支架的制备方法。
为了实现上述目的,本发明采用的技术方案为:一种表面涂层改性的血管
支架的制备方法,包括以下步骤:
(a)通过3D打印设备制备出血管支架的模型,将模型放置在容器中,在容器中加入石膏,石膏成型后,除去模型,形成具有型腔的石膏模具,向该型腔中浇注熔融的镁合金,冷却成型,得到支架基体;
(b)在去离子水中,用砂纸将上述步骤(a)制得的支架基体的表面打磨至光亮,再用无水乙醇冲洗2-3次,再将支架基体放置在弱碱溶液中超声洗涤10-20min;在将支架基体完全浸入到腐蚀液中,浸泡2-5min,无水乙醇超声洗涤10-20min;
(c)将上述步骤(b)处理后的支架基体放置在无水乙醇和氯化镁的水溶液中,支架基体为阴极,石墨为阳极,通电处理,在支架基体表面形成氧化镁基层;
(d)配置PH值为7-8的盐酸多巴胺溶液,将上述步骤(c)处理后的支架基体浸没在配置的盐酸多巴胺溶液中,浸泡10-24h,在氧化镁基层上沉积多巴胺层;
(e)将5-10份聚乳酸和7-10份聚己内酯加入到10-20份氯仿溶液中,搅拌均匀,在向溶液体系中加入10-20份无水乙醇,加热搅拌;称取1-3份氧化镁和0.5-2份氢氧化镁,将氧化镁和氢氧化镁同时加入到溶液体系中,制得混合液A;将上述步骤(d)处理后的支架基体浸泡在所述溶液A中,浸泡10-15h,自然烘干,在支架基体上制得聚合物层;
(f)将上述步骤(e)处理后的支架基体放置在PH值为5-6的镍溶液中,加热至70-80℃,在搅拌条件下,浸泡50-60min,自然干燥;再将支架基体放置在硬脂酸乙醇溶液中,浸泡30-40min中,自然干燥,制得疏水层;
(g)配置载药混合液,通过超声喷涂工艺,将载药混合液喷涂在所述步骤(f)处理后的支架基体的外表面,制得载药层,自然烘干后,得到血管支架。
进一步的在所述步骤(c)中,氯化镁与无水乙醇的质量-体积比为1:2-3,其中,通电处理的电压为300-350V,阴极和阳极的距离为3-4cm。
进一步的在所述步骤(d)中,所述盐酸多巴胺的浓度为0.5-2.5mol/L。
进一步的在所述步骤(f)中,所述镍溶液由以下重量份数的原料制得:
8-10份NiSO4,5-8份NiCl2·6H2O,2-3份H3BO3,11-15份C6H8O7·H2O,20-30份NaH2PO2·H2O,30-40份NH3·H2O,8-10份HF,10-12份NH4NF2,0.2-1份硫脲。
进一步的在所述步骤(f)中,所述硬脂酸乙醇的浓度为0.2-1mol/L。
进一步的所述载药混合液包括聚乳酸和抗血栓药物,所述抗血栓药物为依诺肝素钠,那屈肝素钙或达肝素钠中的一种或多种。
进一步的,所述血管支架的壁厚为0.1-0.2mm,所述氧化镁基层的厚度为10-20um,所述聚合物层的厚度为50-60um,所述疏水层的厚度为30-50um,所述载药层的厚度为70-80um。
由于采用了上述技术方案,本发明的有益效果是:
1.本发明的制备方法中,先通过3D打印设备制备了血管支架的模型,在通过浇注的方式制备镁合金支架,3D打印与浇注相结合,既可以个性化的制备血管支架,又可快速的制备出血管支架,方便快捷。
2.本发明的制备方法中,在镁合金支架基体上先沉积一层氧化镁基层,再在氧化镁基层上制备聚合物层,氧化镁基层与支架本体的、聚合物层与氧化镁基层的结合强度高均较高,并且聚合物层还能隔离支架本体,减缓镁合金支架本体的腐蚀速度,延长支架本体服役寿命。
3.在本发明的制备方法中,在聚合物层上还制备有疏水层,疏水层与聚合物层共同作用,延长支架本体的服役寿命。
具体实施方式
实施例1:一种表面涂层改性的血管支架的制备方法,包括以下步骤:
(a)通过3D打印设备制备出血管支架的模型,将模型放置在容器中,在容器中加入石膏,石膏成型后,除去模型,形成具有型腔的石膏模具,向该型腔中浇注熔融的镁合金,冷却成型,得到支架基体;
(b)在去离子水中,用砂纸将上述步骤(a)制得的支架基体的表面打磨至光亮,再用无水乙醇冲洗2-3次,再将支架基体放置在弱碱溶液中超声洗涤20min;在将支架基体完全浸入到腐蚀液中,浸泡5min,无水乙醇超声洗涤10min;
(c)将上述步骤(b)处理后的支架基体放置在无水乙醇和氯化镁的水溶液中,其中,氯化镁与无水乙醇的质量-体积比为1:2,将支架基体为阴极,石墨为阳极,阴极和阳极之间的距离为3cm,接通300V的直流脉冲电源,在支架基体表面形成氧化镁基层;
(d)配置PH值为7,浓度为1mol/L的盐酸多巴胺溶液,将上述步骤(c)处理后的支架基体浸没在盐酸多巴胺溶液中,浸泡10h后,取出支架基体,自然干燥,得到多巴胺层;
(e)将10份聚乳酸和7份聚己内酯加入到20份氯仿溶液中,搅拌均匀,在向溶液体系中加入20份无水乙醇,加热搅拌;称取3份氧化镁和0.5份氢氧化镁,将氧化镁和氢氧化镁同时加入到溶液体系中,制得混合液A;将上述步骤(d)处理后的支架基体浸泡在所述溶液A中,浸泡15h,自然烘干,在支架基体上制得聚合物层;
(f)将上述步骤(e)处理后的支架基体放置在PH值为6的镍溶液中,加热至80℃,在搅拌条件下,浸泡50min,自然干燥;再将支架基体放置在0.2mol/L硬脂酸乙醇溶液中,浸泡40min中,自然干燥,制得疏水层;其中,镍溶液的由以下重量份数的原料制得:8份NiSO4,8份NiCl2·6H2O,3份H3BO3,15份C6H8O7·H2O,30份NaH2PO2·H2O,30份NH3·H2O,10份HF,10份NH4NF2,0.2份硫脲。
(g)配置聚乳酸和那屈肝素钙的混合溶液,通过超声喷涂工艺,将载药混合液喷涂在所述步骤(f)处理后的支架基体的外表面,制得载药层,自然烘干后,得到血管支架1号。
在本实施例中,血管支架的壁厚为0.1mm,氧化镁基层的厚度为20um,所述聚合物层的厚度为60um,所述疏水层的厚度为30um,所述载药层的厚度为80um。
实施例2:一种表面涂层改性的血管支架的制备方法,包括以下步骤:
(a)通过3D打印设备制备出血管支架的模型,将模型放置在容器中,在容器中加入石膏,石膏成型后,除去模型,形成具有型腔的石膏模具,向该型腔中浇注熔融的镁合金,冷却成型,得到支架基体;
(b)在去离子水中,用砂纸将上述步骤(a)制得的支架基体的表面打磨至光亮,再用无水乙醇冲洗2-3次,再将支架基体放置在弱碱溶液中超声洗涤15min;在将支架基体完全浸入到腐蚀液中,浸泡3min,无水乙醇超声洗涤20min;
(c)将上述步骤(b)处理后的支架基体放置在无水乙醇和氯化镁的水溶液中,其中,氯化镁与无水乙醇的质量-体积比为1:3,将支架基体为阴极,石墨为阳极,阴极和阳极之间的距离为4cm,接通350V的直流脉冲电源,在支架基体表面形成氧化镁基层;
(d)配置PH值为7,浓度为0.5mol/L的盐酸多巴胺溶液,将上述步骤(c)处理后的支架基体浸没在盐酸多巴胺溶液中,浸泡20h后,取出支架基体,自然干燥,得到多巴胺层;
(e)将8份聚乳酸和10份聚己内酯加入到15份氯仿溶液中,搅拌均匀,在向溶液体系中加入20份无水乙醇,加热搅拌;称取2份氧化镁和1份氢氧化镁,将氧化镁和氢氧化镁同时加入到溶液体系中,制得混合液A;将上述步骤(d)处理后的支架基体浸泡在所述溶液A中,浸泡10h,自然烘干,在支架基体上制得聚合物层;
(f)将上述步骤(e)处理后的支架基体放置在PH值为5的镍溶液中,加热至70℃,在搅拌条件下,浸泡50min,自然干燥;再将支架基体放置在0.5mol/L硬脂酸乙醇溶液中,浸泡30min中,自然干燥,制得疏水层;其中,镍溶液的由以下重量份数的原料制得:10份NiSO4,8份NiCl2·6H2O,2份H3BO3,13份C6H8O7·H2O,25份NaH2PO2·H2O,40份NH3·H2O,9份HF,12份NH4NF2,0.8份硫脲。
(g)配置聚乳酸和达肝素钠的混合溶液,通过超声喷涂工艺,将载药混合液喷涂在所述步骤(f)处理后的支架基体的外表面,制得载药层,自然烘干后,得到血管支架2号。
在本实施例中,血管支架的壁厚为0.15mm,氧化镁基层的厚度为15um,所述聚合物层的厚度为50um,所述疏水层的厚度为50um,所述载药层的厚度为80um。
实施例3:一种表面涂层改性的血管支架的制备方法,包括以下步骤:
(a)通过3D打印设备制备出血管支架的模型,将模型放置在容器中,在容器中加入石膏,石膏成型后,除去模型,形成具有型腔的石膏模具,向该型腔中浇注熔融的镁合金,冷却成型,得到支架基体;
(b)在去离子水中,用砂纸将上述步骤(a)制得的支架基体的表面打磨至光亮,再用无水乙醇冲洗2-3次,再将支架基体放置在弱碱溶液中超声洗涤15min;在将支架基体完全浸入到腐蚀液中,浸泡3min,无水乙醇超声洗涤20min;
(c)将上述步骤(b)处理后的支架基体放置在无水乙醇和氯化镁的水溶液中,其中,氯化镁与无水乙醇的质量-体积比为1:3,将支架基体为阴极,石墨为阳极,阴极和阳极之间的距离为4cm,接通350V的直流脉冲电源,在支架基体表面形成氧化镁基层;
(d)配置PH值为8,浓度为2.5mol/L的盐酸多巴胺溶液,将上述步骤(c)处理后的支架基体浸没在盐酸多巴胺溶液中,浸泡10h后,取出支架基体,自然干燥,得到多巴胺层;
(e)将5份聚乳酸和10份聚己内酯加入到10份氯仿溶液中,搅拌均匀,在向溶液体系中加入20份无水乙醇,加热搅拌;称取2份氧化镁和1份氢氧化镁,将氧化镁和氢氧化镁同时加入到溶液体系中,制得混合液A;将上述步骤(d)处理后的支架基体浸泡在所述溶液A中,浸泡10h,自然烘干,在支架基体上制得聚合物层;
(f)将上述步骤(e)处理后的支架基体放置在PH值为5的镍溶液中,加热至70℃,在搅拌条件下,浸泡50min,自然干燥;再将支架基体放置在0.5mol/L硬脂酸乙醇溶液中,浸泡30min中,自然干燥,制得疏水层;其中,镍溶液的由以下重量份数的原料制得:10份NiSO4,8份NiCl2·6H2O,2份H3BO3,11份C6H8O7·H2O,25份NaH2PO2·H2O,40份NH3·H2O,8份HF,10份NH4NF2,0.2份硫脲。
(g)配置聚乳酸和达肝素钠的混合溶液,通过超声喷涂工艺,将载药混合液喷涂在所述步骤(f)处理后的支架基体的外表面,制得载药层,自然烘干后,得到血管支架3号。
在本实施例中,血管支架的壁厚为0.2mm,氧化镁基层的厚度为20um,所述聚合物层的厚度为60um,所述疏水层的厚度为50um,所述载药层的厚度为80um。
实施例4:一种表面涂层改性的血管支架的制备方法,包括以下步骤:
(a)通过3D打印设备制备出血管支架的模型,将模型放置在容器中,在容器中加入石膏,石膏成型后,除去模型,形成具有型腔的石膏模具,向该型腔中浇注熔融的镁合金,冷却成型,得到支架基体;
(b)在去离子水中,用砂纸将上述步骤(a)制得的支架基体的表面打磨至光亮,再用无水乙醇冲洗2-3次,再将支架基体放置在弱碱溶液中超声洗涤15min;在将支架基体完全浸入到腐蚀液中,浸泡3min,无水乙醇超声洗涤20min;
(c)将上述步骤(b)处理后的支架基体放置在无水乙醇和氯化镁的水溶液中,其中,氯化镁与无水乙醇的质量-体积比为1:2,将支架基体为阴极,石墨为阳极,阴极和阳极之间的距离为3cm,接通300V的直流脉冲电源,在支架基体表面形成氧化镁基层;
(d)配置PH值为7,浓度为2mol/L的盐酸多巴胺溶液,将上述步骤(c)处理后的支架基体浸没在盐酸多巴胺溶液中,浸泡14h后,取出支架基体,自然干燥,得到多巴胺层;
(e)将5份聚乳酸和10份聚己内酯加入到20份氯仿溶液中,搅拌均匀,在向溶液体系中加入20份无水乙醇,加热搅拌;称取1份氧化镁和2份氢氧化镁,将氧化镁和氢氧化镁同时加入到溶液体系中,制得混合液A;将上述步骤(d)处理后的支架基体浸泡在所述溶液A中,浸泡15h,自然烘干,在支架基体上制得聚合物层;
(f)将上述步骤(e)处理后的支架基体放置在PH值为6的镍溶液中,加热至70℃,在搅拌条件下,浸泡55min,自然干燥;再将支架基体放置在1mol/L硬脂酸乙醇溶液中,浸泡30min中,自然干燥,制得疏水层;其中,镍溶液的由以下重量份数的原料制得:10份NiSO4,8份NiCl2·6H2O,2份H3BO3,13份C6H8O7·H2O,25份NaH2PO2·H2O,40份NH3·H2O,9份HF,12份NH4NF2,0.8份硫脲。
(g)配置聚乳酸和达肝素钠的混合溶液,通过超声喷涂工艺,将载药混合液喷涂在所述步骤(f)处理后的支架基体的外表面,制得载药层,自然烘干后,得到血管支架4号。
在本实施例中,血管支架的壁厚为0.15mm,氧化镁基层的厚度为18um,所述聚合物层的厚度为50um,所述疏水层的厚度为43um,所述载药层的厚度为75um。
对比试验例1:采用实施例1中步骤(a)-(b)制备血管支架5号。
对比试验例2:采用实施例1中步骤(a)-(e)制备血管支架6号。
将上述血管支架1-6号,在体外模拟体内环境,进行腐蚀试验,观察得到,5号的腐蚀速度最快,6号的腐蚀速度较5号的慢,但5号6号的腐蚀速度均比1-4号的要快的多,可以得出,通过本发明的方法制备的血管支架的耐腐蚀性好。
Claims (7)
1.一种表面涂层改性的血管支架的制备方法,包括以下步骤:
(a)通过3D打印设备制备出血管支架的模型,将模型放置在容器中,在容器中加入石膏,石膏成型后,除去模型,形成具有型腔的石膏模具,向该型腔中浇注熔融的镁合金,冷却成型,得到支架基体;
(b)在去离子水中,用砂纸将上述步骤(a)制得的支架基体的表面打磨至光亮,再用无水乙醇冲洗2-3次,再将支架基体放置在弱碱溶液中超声洗涤10-20min;在将支架基体完全浸入到腐蚀液中,浸泡2-5min,无水乙醇超声洗涤10-20min;
(c)将上述步骤(b)处理后的支架基体放置在无水乙醇和氯化镁的水溶液中,支架基体为阴极,石墨为阳极,通电处理,在支架基体表面形成氧化镁基层;
(d)配置pH 值为7-8的盐酸多巴胺溶液,将上述步骤(c)处理后的支架基体浸没在配置的盐酸多巴胺溶液中,浸泡10-24h,在氧化镁基层上沉积多巴胺层;
(e)将5-10份聚乳酸和7-10份聚己内酯加入到10-20份氯仿溶液中,搅拌均匀,在向溶液体系中加入10-20份无水乙醇,加热搅拌;称取1-3份氧化镁和0.5-2份氢氧化镁,将氧化镁和氢氧化镁同时加入到溶液体系中,制得混合液A;将上述步骤(d)处理后的支架基体浸泡在所述溶液A中,浸泡10-15h,自然烘干,在支架基体上制得聚合物层;
(f)将上述步骤(e)处理后的支架基体放置在pH 值为5-6的镍溶液中,加热至70-80℃,在搅拌条件下,浸泡50-60min,自然干燥;再将支架基体放置在硬脂酸乙醇溶液中,浸泡30-40min中,自然干燥,制得疏水层;
(g)配置载药混合液,通过超声喷涂工艺,将载药混合液喷涂在所述步骤(f)处理后的支架基体的外表面,制得载药层,自然烘干后,得到血管支架。
2.根据权利要求1所述的表面涂层改性的血管支架的制备方法,其特征在于:在所述步骤(c)中,氯化镁与无水乙醇的质量-体积比为1:2-3,其中,通电处理的电压为300-350V,阴极和阳极的距离为3-4cm。
3.根据权利要求1所述的表面涂层改性的血管支架的制备方法,其特征在于:在所述步骤(d)中,所述盐酸多巴胺的浓度为0.5-2.5mol/L。
4.根据权利要求1所述的表面涂层改性的血管支架的制备方法,其特征在于:在所述步骤(f)中,所述镍溶液由以下重量份数的原料制得:
8-10份NiSO4,5-8份NiCl2·6H2O,2-3份H3BO3,11-15份C6H8O7·H2O,20-30份NaH2PO2·H2O,30-40份NH3·H2O,8-10份HF,10-12份NH4NF2,0.2-1份硫脲。
5.根据权利要求1所述的表面涂层改性的血管支架的制备方法,其特征在于:在所述步骤(f)中,所述硬脂酸乙醇的浓度为0.2-1mol/L。
6.根据权利要求1所述的表面涂层改性的血管支架的制备方法,其特征在于:所述载药混合液包括聚乳酸和抗血栓药物,所述抗血栓药物为依诺肝素钠,那屈肝素钙或达肝素钠中的一种或多种。
7.根据权利要求1所述的表面涂层改性的血管支架的制备方法,其特征在于:所述血管支架的壁厚为0.1-0.2mm,所述氧化镁基层的厚度为10-20um,所述聚合物层的厚度为50-60um,所述疏水层的厚度为30-50um,所述载药层的厚度为70-80um。
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