CN107928838A - 一种易回收腔静脉过滤器 - Google Patents
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Abstract
本申请设计一种易回收腔静脉过滤器,包括回收钩、金属帽,固定金属丝,导向金属丝,小钩和反向推送支撑环,所述回收钩与金属帽下端连接,所述固定金属丝和导向金属丝的一端连接金属帽上端连接,所述导向金属丝的另一端连接反向推送支撑环,所述固定金属丝另一端通过拐点与小钩连接,所述拐点处形成光滑凸起,在固定金属丝从距金属帽上端2mm处开始直至凸起处,导向金属丝从距金属帽上端2mm处开始直至顶端涂覆一层解碳材料。方便回收腔静脉过滤器的小钩的后面通过工艺手法将拐点处形成光滑凸起及在金属丝上涂覆与人体相容性非常好的热解碳材料,有效避免了血管壁被过滤器穿破的风险,增加了过滤器在血管中的滞留时间,提高了过滤器的回收率。
Description
技术领域
本申请涉及一种医疗器械,特别涉及一种易回收腔静脉过滤器。
背景技术
腔静脉滤器主要适应症为肺动脉栓塞及深静脉血栓性病变等。肺动脉栓塞是临床发病率、死亡率较高的急症,虽然全身抗凝治疗能取得一些疗效,但仍有3-20%发生再次肺动脉栓塞,而且抗凝治疗本身也有26%的并发症,其中5-12%是致命性并发症;一些病人不能接受抗凝治疗,如急性出血、消化道溃疡、原发或转移性肿瘤(尤其是颅内肿瘤)、妊娠、手术治疗前等等。
市场上现有同类产品多呈伞状结构,由导向部、过滤部及固定部组成。导向部由较长的3根金属丝构成,起控制方向作用,其中最长的金属丝顶端有导向支撑环,支撑环一方面对过滤器起导向及支撑作用。固定部由多根顶端带钩的金属丝构成,金属丝顶端的小钩挂在血管壁上,从而能将过滤器固定在血管内。过滤部指金属丝排列较密的部位,包括导向金属丝和固定金属丝。主要对血液中的血栓起过滤作用。金属丝汇集处由金属帽固定,金属帽下面有个回收钩。回收钩一方面可以用于释放过滤器到血管里面时当作释放点,另一方面可以用于从血管中回收过滤器。
过滤器固定部顶端的小钩虽然起到了固定过滤器的作用,但是由于直钩容易穿透血管壁对其他组织及血管造成威胁,小钩有时候会将血管穿破,甚至穿破后再穿入到其他血管或组织中;有时候会引起过滤器偏移。
另外,可回收腔静脉过滤器经常会遇到在使用完之后,结缔组织等附着导致从血管中滞留取不出来的问题,最后只能留在身体里面,这样也是消费者不愿意接受的结果。
发明内容
为解决上述问题,本申请提供一种易回收腔静脉过滤器。
一种腔静脉过滤器,包括回收钩、金属帽,固定金属丝,导向金属丝,小钩和反向推送支撑环,所述回收钩与金属帽下端连接,所述固定金属丝和导向金属丝的一端与金属帽上端连接,所述导向金属丝的另一端连接反向推送支撑环,其特征在于:所述固定金属丝另一端通过拐点与小钩连接,所述拐点处形成光滑凸起,在固定金属丝距金属帽上端2mm处开始直至凸起处,导向金属丝距金属帽上端2mm处开始直至顶端涂覆一层解碳材料,反向推送支撑环不涂。
优选,所述凸起是由在拐角处用比固定金属丝更细的金属丝进行缠绕,缠绕出来一个凸起,所述更细的金属丝为一根或大于等于二根,所述凸起的外直径是0.8mm-0.9mm,小钩的长度2.05mm,固定金属丝的直径0.3mm。
优选,所述凸起为在所述拐点处形成的珠点或扭转成的圆环(3)。
优选,所述珠点与圆环或固定金属丝(5)一体成型。
优选,所述珠点通过对拐角两边的金属丝及金属钩进行挤压形成,在小钩的前面形成一个光滑的珠点,所述珠点的外直径是0.8mm。
优选,所述圆环由固定金属丝(5)在拐点处扭转而成。
优选,圆环的外直径是0.9mm,小钩的长度2.05mm,固定金属丝的直径0.3mm。
优选,所述涂覆为间隔涂覆,即在不需要涂覆的金属丝上面缠绕更细的金属丝,该更细的金属丝涂覆解碳材料后再行剥离。
一种制备上述腔静脉过滤器的方法,其使用涂层工艺为化学气相沉积法,包括如下步骤:
(1)用金属丝缠绕滤器上无需涂层的部位;
(2)开启高频热解炉;
(3)向炉内通氩气,并加热至800-1000摄氏度;
(4)然后通入丙烷,控制氩气流速使其在炉中呈悬浮状态,使其悬浮1小时;
(5)最后剥离金属丝即可。
一种制备上述腔静脉过滤器的方法,将更细的金属丝间隔或连续缠绕在需要涂覆热解碳材料的部位,涂层完成后再将缠绕的金属丝剥离。
易回收腔静脉过滤器的挂钩的后面通过工艺手法将拐点处做成一体成型的光滑圆珠或者在直角拐点处另外缠绕金属丝形成光滑圆环,有效避免了血管壁被过滤器穿破的风险,极大地防止了过滤器偏移或倾斜的情况。过滤器处于工作位置,不易发生移动,有利于回收。易回收腔静脉过滤器使用新型材料,因此,可以增加过滤器在体内的滞留工作的时间,并且容易从身体血管里面取出来,避免残存身体内。
附图说明
图1为方便回收腔静脉过滤器的图。
图2为经缠绕形成的凸起的示意图。
图3为一体成型的凸起的示意图。
图4为连续涂覆解碳材料的示意图。
图5为间隔涂覆解碳材料的示意图。
具体实施方式
一种腔静脉过滤器,包括回收钩8、金属帽7,固定金属丝5,导向金属丝2,小钩4和反向推送支撑环1,所述回收钩8与金属帽7下端连接,所述固定金属丝5和导向金属丝2的一端与金属帽上端6连接,所述导向金属丝2的另一端连接支撑环1,其特征在于:所述固定金属丝5另一端通过拐点与小钩4连接,所述拐点处形成光滑凸起,在固定金属丝5距金属帽7上端2mm处开始直至凸起处,导向金属丝2距金属帽上端2mm处开始直至导向金属丝2顶端涂覆一层解碳材料9。
优选,所述凸起是由在拐角处用比固定金属丝更细的金属丝进行缠绕,缠绕出来一个凸起,所述更细的金属丝为一根或大于等于二根,所述凸起的外直径是0.8mm-0.9mm,小钩的长度2.05mm,固定金属丝的直径0.3mm。
优选,所述凸起为在所述拐点处形成的珠点或扭转成的圆环(3)。
优选,所述珠点或圆环与固定金属丝(5)一体成型。
优选,所述珠点通过对拐角两边的金属丝及金属钩进行挤压形成,在小钩的前面形成一个光滑的珠点,所述珠点的外直径是0.8mm。
优选,所述圆环由固定金属丝(5)在拐点处扭转而成。
优选,圆环的外直径是0.9mm,小钩的长度2.05mm,固定金属丝的直径0.3mm。
优选,所述涂覆为间隔涂覆,即在不需要涂覆的金属丝上面缠绕更细的金属丝,过滤器涂覆解碳材料后,再将缠绕的金属丝剥离下来。
一种制备上述腔静脉过滤器的方法,其使用涂层工艺为化学气相沉积法,包括如下步骤:
(1)用金属丝缠绕滤器上无需涂层的部位;
(2)开启高频热解炉;
(3)向炉内通氩气,并加热至800-1000摄氏度;
(4)然后通入丙烷,控制氩气流速使其在炉中呈悬浮状态,使其悬浮1小时;
(5)最后剥离金属丝即可。
一种制备上述腔静脉过滤器的方法,将更细的金属丝间隔或连续缠绕在不需要涂覆的部位,过滤器涂覆解碳材料后,再将缠绕的金属丝剥离下来。
易回收腔静脉过滤器的挂钩的后面通过工艺手法将拐点处做成一体成型的光滑圆珠或者在直角拐点处另外缠绕金属丝形成光滑圆环,有效避免了血管壁被过滤器穿破的风险,极大地防止了过滤器偏移或倾斜的情况。过滤器处于工作位置,不易发生移动,有利于回收。易回收腔静脉过滤器使用新型材料与人体相容性非常好,因此,可以增加过滤器在体内的滞留工作的时间,并且容易从身体血管里面取出来,避免残存身体内。
Claims (10)
1.一种易回收腔静脉过滤器,包括回收钩(8)、金属帽(7),固定金属丝(5),导向金属丝(2),小钩(4)和反向推送支撑环(1),所述回收钩(8)与金属帽(7)下端连接,所述固定金属丝(5)和导向金属丝(2)的一端与金属帽上端(6)连接,所述导向金属丝(2)的另一端连接反向推送支撑环(1),其特征在于:所述固定金属丝(5)另一端通过拐点与小钩(4)连接,所述拐点处形成光滑凸起,在固定金属丝(5)距金属帽(7)上端2mm处开始直至凸起处,导向金属丝(2)距金属帽上端2mm处开始直至导向金属丝(2)的顶端涂覆一层解碳材料(9)。
2.如权利要求1所述的一种易回收腔静脉过滤器,所述凸起是由在拐角处用比固定金属丝更细的金属丝进行缠绕,缠绕出来一个凸起,所述更细的金属丝为一根或大于等于二根,所述凸起的外直径是0.8mm-0.9mm,小钩的长度2.05mm,固定金属丝的直径0.3mm。
3.如权利要求1所述的一种易回收腔静脉过滤器,所述凸起为在所述拐点处形成的珠点或扭转成的圆环(3)。
4.如权利要求3所述的一种易回收腔静脉过滤器,所述珠点或圆环与固定金属丝(5)一体成型。
5.如权利要求3所述的一种易回收腔静脉过滤器,所述珠点通过对拐角两边的金属丝及金属钩进行挤压形成,在小钩的前面形成一个光滑的珠点,所述珠点的外直径是0.8mm,圆环的外直径是0.9mm。
6.如权利要求3所述的一种易回收腔静脉过滤器,所述圆环由固定金属丝(5)在拐点处扭转而成。
7.如权利要求3所述的一种易回收腔静脉过滤器,小钩的长度2.05mm,固定金属丝的直径0.3mm。
8.如权利要求1所述的一种易回收腔静脉过滤器,所述涂覆为间隔涂覆,即在不需要涂覆热解碳材料的金属丝上面先缠绕更细的金属丝,该更细的金属丝涂覆解碳材料后再行剥离。
9.一种制备如权利要求1-8任一项所述的腔静脉过滤器的方法,其使用涂层工艺为化学气相沉积法,包括如下步骤:
(1)用金属丝缠绕滤器上无需涂层的部位;
(2)开启高频热解炉;
(3)向炉内通氩气,并加热至800-1000摄氏度;
(4)然后通入丙烷,控制氩气流速使其在炉中呈悬浮状态,使其悬浮1小时;
(5)最后剥离金属丝即可。
10.一种制备如权利要求1-8任一项所述的易回收腔静脉过滤器的方法,先将金属丝间隔或连续缠绕在过滤器上不需要涂覆热解碳材料的部位,然后将过滤器整体涂覆解碳材料,最后将缠绕在过滤器上的金属丝剥离,形成全部涂覆热解碳材料的过滤器或者间隔涂覆热解碳材料的过滤器。
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