CN112899618B - 一种血管支架表面具有催化能力的涂层及其制备方法 - Google Patents
一种血管支架表面具有催化能力的涂层及其制备方法 Download PDFInfo
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Abstract
本发明涉及一种血管支架表面具有催化能力的涂层及其制备方法,在传统的血管支架涂层表面注入具有催化性能的金属粒子,可以促进NO分子的形成进而提高了支架涂层的血液相容性。考虑到双金属粒子在催化领域的协同效果有着广泛的应用以及各类金属元素对人体的利弊,发明人经过大量试验确定以Cu‑Ni作为支架涂层表面的催化元素。
Description
技术领域
本发明涉及涂层制备领域,具体涉及一种血管支架表面具有催化能力的涂层及其制备方法。
背景技术
血管支架是冠心病治疗过程中的重要医疗器械,通过支架良好的力学性能支撑血管,可以有效阻止血管的弹性回缩,保持病变区域血液的畅通。其中,镁合金作为可降解的血管支架材料已广泛应用于血管支架领域。然而,长久以来,血管支架的血液相容性困扰着国内外众多学者,如何提高血管支架的血液相容性也就成为了医学领域的长期课题。
发明内容
针对现有技术存在的缺陷,本发明旨在提供一种血管支架表面具有催化能力的涂层,该涂层可以催化人体释放NO,进而提高其血液相容性。
一种血管支架表面具有催化能力的涂层制备方法,包括以下步骤:
A.衬底预处理:以医用镁合金为衬底材料,先后经脱脂处理、砂纸打磨、乙醇超声清洗并烘干待用;
B.制备MgO过渡层:将烘干后的镁合金放入溅射镀膜机中,以金属镁靶材作为溅射源,在氩气和氧气混合气氛下制备MgO过渡层,其中电源功率为70-100W,氩气流量40-60sccm,氧气流量30-50sccm,衬底温度180-200℃,溅射时间25-30min;
C.制备TiO2涂层:更换溅射靶材,以高纯度钛靶作为溅射源,在氧气和氩气的混合气氛下制备TiO2薄膜,其中,溅射气压1-5Pa,氩气流量40-60sccm,氧气流量10-30sccm,溅射时间40-60min,衬底温度150-180℃;
D.真空退火:将覆有TiO2涂层的衬底材料放入真空退火炉中进行退火,退火温度300-350℃,退火时间2-2.5h;
E.离子注入催化粒子:将退火后的衬底材料放置于金属蒸汽真空弧电源离子注入设备中,调整离子注入设备腔室的真空度为1×10-4-2×10-4Pa,并选用Cu离子和Ni离子进行离子注入,离子电压为70-100keV,Cu离子注入量为8×109-6×1012ions/cm2,Ni离子注入量为8×1010-12×1010ions/cm2。
进一步地,所述步骤C中钛靶纯度为99.999%。
进一步地,所述衬底为Mg-Zn-Y-Nd镁合金。
进一步地,所述脱脂处理选用浓度为15%的碳酸钠溶液。
进一步地,所述超声处理时间为20min。
优选地,Cu离子注入量为8×1010ions/cm2,Ni离子注入量为8×1010ions/cm2。
本发明还提供了一种血管支架表面具有催化能力的涂层,所述涂层由上述方法制备而得。
众所周知,NO(一氧化氮)是一种典型地治疗性气体分子,其作为激活剂可以有效地促进血管扩张并抑制血小板粘附。本发明创造性地在传统的血管支架涂层表面注入具有催化性能的金属粒子,可以促进NO分子的形成进而提高了支架涂层的血液相容性。考虑到双金属粒子在催化领域的协同效果有着广泛的应用以及各类金属元素对人体的利弊,发明人经过大量试验确定以Cu-Ni作为支架涂层表面的催化元素。同时,本发明的涂层中设置了MgO过渡层,其有利于提高镁合金衬底和表面二氧化钛涂层的结合强度。
值得一提的是,本发明中具有催化能力的金属粒子仅能在涂层表面才可发挥其作用,因此,选用离子注入法向二氧化钛涂层表面掺入Cu-Ni金属粒子。如果选用其他方法则无法达到相同的效果,例如,如果选用溅射法向二氧化钛涂层中掺杂金属粒子,则金属粒子会均匀分布于涂层的表面及内部,无法使得仅能在涂层表面发挥催化作用的金属元素发挥其应用的作用。
具体实施方式
下面通过具体实施例来验证本发明的技术效果,但是本发明的实施方式不局限于此。
实施例1
一种血管支架表面具有催化能力的涂层制备方法,包括以下步骤:
A.衬底预处理:以Mg-Zn-Y-Nd医用镁合金为衬底材料,先后经脱脂处理、砂纸打磨、乙醇超声清洗并烘干待用,其中脱脂处理选用浓度为15%的碳酸钠溶液,超声清洗时间为20min。
B.制备MgO过渡层:将烘干后的镁合金放入溅射镀膜机中,以金属镁靶材作为溅射源,在氩气和氧气混合气氛下制备MgO过渡层,其中电源功率为70W,氩气流量40sccm,氧气流量30sccm,衬底温度180℃,溅射时间25min。
C.制备TiO2涂层:更换溅射靶材,以纯度为99.999%的钛靶作为溅射源,在氧气和氩气的混合气氛下制备TiO2薄膜,其中,溅射气压1Pa,氩气流量40sccm,氧气流量10sccm,溅射时间60min,衬底温度150℃。
D.真空退火:将覆有TiO2涂层的衬底材料放入真空退火炉中进行退火,退火温度350℃,退火时间2h。
E.离子注入催化粒子:将退火后的衬底材料放置于金属蒸汽真空弧电源离子注入设备中,调整离子注入设备腔室的真空度为2×10-4Pa,并选用Cu离子和Ni离子进行离子注入,离子电压为70keV,Cu离子注入量为6×1012ions/cm2,Ni离子注入量为8×1010ions/cm2。
实施例2
一种血管支架表面具有催化能力的涂层制备方法,包括以下步骤:
A.衬底预处理:以Mg-Zn-Y-Nd医用镁合金为衬底材料,先后经脱脂处理、砂纸打磨、乙醇超声清洗并烘干待用,其中脱脂处理选用浓度为15%的碳酸钠溶液,超声清洗时间为20min。
B.制备MgO过渡层:将烘干后的镁合金放入溅射镀膜机中,以金属镁靶材作为溅射源,在氩气和氧气混合气氛下制备MgO过渡层,其中电源功率为70W,氩气流量40sccm,氧气流量30sccm,衬底温度180℃,溅射时间25min。
C.制备TiO2涂层:更换溅射靶材,以纯度为99.999%的钛靶作为溅射源,在氧气和氩气的混合气氛下制备TiO2薄膜,其中,溅射气压1Pa,氩气流量40sccm,氧气流量10sccm,溅射时间60min,衬底温度150℃。
D.真空退火:将覆有TiO2涂层的衬底材料放入真空退火炉中进行退火,退火温度350℃,退火时间2h。
E.离子注入催化粒子:将退火后的衬底材料放置于金属蒸汽真空弧电源离子注入设备中,调整离子注入设备腔室的真空度为2×10-4Pa,并选用Cu离子和Ni离子进行离子注入,离子电压为70keV,Cu离子注入量为8×1010ions/cm2,Ni离子注入量为8×1010ions/cm2。
实施例3
一种血管支架表面具有催化能力的涂层制备方法,包括以下步骤:
A.衬底预处理:以Mg-Zn-Y-Nd医用镁合金为衬底材料,先后经脱脂处理、砂纸打磨、乙醇超声清洗并烘干待用,其中脱脂处理选用浓度为15%的碳酸钠溶液,超声清洗时间为20min。
B.制备MgO过渡层:将烘干后的镁合金放入溅射镀膜机中,以金属镁靶材作为溅射源,在氩气和氧气混合气氛下制备MgO过渡层,其中电源功率为70W,氩气流量40sccm,氧气流量30sccm,衬底温度180℃,溅射时间25min。
C.制备TiO2涂层:更换溅射靶材,以纯度为99.999%的钛靶作为溅射源,在氧气和氩气的混合气氛下制备TiO2薄膜,其中,溅射气压1Pa,氩气流量40sccm,氧气流量10sccm,溅射时间60min,衬底温度150℃。
D.真空退火:将覆有TiO2涂层的衬底材料放入真空退火炉中进行退火,退火温度350℃,退火时间2h。
E.离子注入催化粒子:将退火后的衬底材料放置于金属蒸汽真空弧电源离子注入设备中,调整离子注入设备腔室的真空度为2×10-4Pa,并选用Cu离子和Ni离子进行离子注入,离子电压为70keV,Cu离子注入量为8×109ions/cm2,Ni离子注入量为12×1010ions/cm2。
对比例1
一种血管支架表面具有催化能力的涂层制备方法,包括以下步骤:
A.衬底预处理:以Mg-Zn-Y-Nd医用镁合金为衬底材料,先后经脱脂处理、砂纸打磨、乙醇超声清洗并烘干待用,其中脱脂处理选用浓度为15%的碳酸钠溶液,超声清洗时间为20min。
B.制备MgO过渡层:将烘干后的镁合金放入溅射镀膜机中,以金属镁靶材作为溅射源,在氩气和氧气混合气氛下制备MgO过渡层,其中电源功率为70W,氩气流量40sccm,氧气流量30sccm,衬底温度180℃,溅射时间25min。
C.制备TiO2涂层:更换溅射靶材,以纯度为99.999%的钛靶作为溅射源,在氧气和氩气的混合气氛下制备TiO2薄膜,其中,溅射气压1Pa,氩气流量40sccm,氧气流量10sccm,溅射时间60min,衬底温度150℃。
D.真空退火:将覆有TiO2涂层的衬底材料放入真空退火炉中进行退火,退火温度350℃,退火时间2h。
对比例2
一种血管支架表面具有催化能力的涂层制备方法,包括以下步骤:
A.衬底预处理:以Mg-Zn-Y-Nd医用镁合金为衬底材料,先后经脱脂处理、砂纸打磨、乙醇超声清洗并烘干待用,其中脱脂处理选用浓度为15%的碳酸钠溶液,超声清洗时间为20min。
B.制备MgO过渡层:将烘干后的镁合金放入溅射镀膜机中,以金属镁靶材作为溅射源,在氩气和氧气混合气氛下制备MgO过渡层,其中电源功率为70W,氩气流量40sccm,氧气流量30sccm,衬底温度180℃,溅射时间25min。
C.制备TiO2涂层:更换溅射靶材,以纯度为99.999%的钛靶作为溅射源,在氧气和氩气的混合气氛下制备TiO2薄膜,其中,溅射气压1Pa,氩气流量40sccm,氧气流量10sccm,溅射时间60min,衬底温度150℃。
D.真空退火:将覆有TiO2涂层的衬底材料放入真空退火炉中进行退火,退火温度350℃,退火时间2h。
E.离子注入催化粒子:将退火后的衬底材料放置于金属蒸汽真空弧电源离子注入设备中,调整离子注入设备腔室的真空度为2×10-4Pa,并选用Cu离子进行离子注入,离子电压为70keV,Cu离子注入量为1.6×1011ions/cm2。
对比例3
一种血管支架表面具有催化能力的涂层制备方法,包括以下步骤:
A.衬底预处理:以Mg-Zn-Y-Nd医用镁合金为衬底材料,先后经脱脂处理、砂纸打磨、乙醇超声清洗并烘干待用,其中脱脂处理选用浓度为15%的碳酸钠溶液,超声清洗时间为20min。
B.制备MgO过渡层:将烘干后的镁合金放入溅射镀膜机中,以金属镁靶材作为溅射源,在氩气和氧气混合气氛下制备MgO过渡层,其中电源功率为70W,氩气流量40sccm,氧气流量30sccm,衬底温度180℃,溅射时间25min。
C.制备TiO2涂层:更换溅射靶材,以纯度为99.999%的钛靶作为溅射源,在氧气和氩气的混合气氛下制备TiO2薄膜,其中,溅射气压1Pa,氩气流量40sccm,氧气流量10sccm,溅射时间60min,衬底温度150℃。
D.真空退火:将覆有TiO2涂层的衬底材料放入真空退火炉中进行退火,退火温度350℃,退火时间2h。
E.离子注入催化粒子:将退火后的衬底材料放置于金属蒸汽真空弧电源离子注入设备中,调整离子注入设备腔室的真空度为2×10-4Pa,并选用Ni离子进行离子注入,离子电压为70keV,Ni离子注入量为1.6×1011ions/cm2。
接下来,我们通过溶血试验评价各样品的血液相容性,其原理在于:将样品与血液直接接触,测定红细胞膜破裂后释放的血红蛋白量,以检测各样品体外溶血程度。血红蛋白的吸收波长为545nm,可用分光光度计检测其浓度。具体操作步骤如下:
(1)从健康家兔心脏采血100mL,加入2%草酸钾5mL,制成新鲜抗凝血。取抗凝血40mL,加入0.9%氯化钠注射液50mL进行稀释。
(2)取3支硅化试管,一支试管装入试验样品和氯化钠注射液10mL,一支试管空白作为阴性对照组加入氯化钠生理盐水10mL,另外一支试管空白作为阳性对照组分别加入10mL蒸馏水。
(3)所有试管在37℃水浴中恒温30min,分别加入5mL抗凝兔血,并在37℃条件下保温60min。
(4)取试管上层清液,在545nm波长处测定吸光度。每一样品进行三次平行试验并取平均值。
溶血率的计算公式如下:
溶血率(%)=(试样平均吸光度-阴性组吸光度)/(阳性组吸光度-阴性组吸光度)×100
实施例1-3(对应A、B、C)及对比例1-3(对应X、Y、Z)的试验样品对应的溶血率如表1所示。
表1 各样品溶血率
样品 | A | B | C | X | Y | Z |
溶血率/% | 4.6 | 1.7 | 7.3 | 18.5 | 10.4 | 12.9 |
根据表1可以看出,向血管支架二氧化钛涂层表面离子注入催化金属后有利于提高其血液相容性。
以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明技术原理的前提下,还可以做出若干改进和变型,这些改进和变型也应视为本发明的保护范围。
Claims (7)
1.一种血管支架表面具有催化能力的涂层制备方法,包括以下步骤:
A.衬底预处理:以医用镁合金为衬底材料,先后经脱脂处理、砂纸打磨、乙醇超声清洗并烘干待用;
B.制备MgO过渡层:将烘干后的镁合金放入溅射镀膜机中,以金属镁靶材作为溅射源,在氩气和氧气混合气氛下制备MgO过渡层,其中电源功率为70-100W,氩气流量40-60sccm,氧气流量30-50sccm,衬底温度180-200℃,溅射时间25-30min;
C.制备TiO2涂层:更换溅射靶材,以高纯度钛靶作为溅射源,在氧气和氩气的混合气氛下制备TiO2薄膜,其中,溅射气压1-5Pa,氩气流量40-60sccm,氧气流量10-30sccm,溅射时间40-60min,衬底温度150-180℃;
D.真空退火:将覆有TiO2涂层的衬底材料放入真空退火炉中进行退火,退火温度300-350℃,退火时间2-2.5h;
E.离子注入催化粒子:将退火后的衬底材料放置于金属蒸汽真空弧电源离子注入设备中,调整离子注入设备腔室的真空度为1×10-4-2×10-4Pa,并选用Cu离子和Ni离子进行离子注入,离子电压为70-100keV,Cu离子注入量为8×109-6×1012ions/cm2,Ni离子注入量为8×1010-12×1010ions/cm2。
2.一种如权利要求1所述的制备方法,其特征在于:所述步骤C中钛靶纯度为99.999%。
3.一种如权利要求1-2任一项所述的制备方法,其特征在于:所述衬底为Mg-Zn-Y-Nd镁合金。
4.一种如权利要求1-2任一项所述的制备方法,其特征在于:所述脱脂处理选用浓度为15%的碳酸钠溶液。
5.一种如权利要求1-2任一项所述的制备方法,其特征在于,所述超声处理时间为20min。
6.一种如权利要求1所述的制备方法,其特征在于,Cu离子注入量为8×1010ions/cm2,Ni离子注入量为8×1010ions/cm2。
7.一种血管支架表面具有催化能力的涂层,其特征在于,所述涂层由权利要求1-6中任一项方法制备而得。
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