The invention belongs to the technical field of medical devices, and discloses a double-acting total acetabular prosthesis with a pressure-matched fixed ball head, which is used to solve the high-risk problems of hip dislocation caused by developmental dysplasia of the hip joint, bone loss, joint or soft tissue relaxation, etc. The structure from outside to inside includes: (1) outer cup (3) acetabular screw; There is no relative movement between the outer cup and the inner lining A. There is no joint surface. The inner lining A has a hemispherical inner spherical joint surface (). The inner lining B (inlaid with_inner lining of_metal shell) has a hemispherical outer spherical joint surface. \0\, \lining has a hemispherical inner spherical articular surface\, \_\, \small spherical head has a hemispherical outer spherical articular surface\, \0\. The small spherical head is locked by pressing into the_lining. (2) The inner spherical articular surface \lined with A and the outer spherical articular surface\ lined with metal shell form outer joints, and the inner spherical articular surface \lined with small spherical head\ form inner joints, and the inner and outer joints form double-acting total acetabular prosthesis, characterized by double inner lining and double articular surfaces. This acetabular prosthesis is easy to install, can increase the activity of the prosthesis, prevent acetabular dislocation and reduce wear rate.
【技术实现步骤摘要】
一种压配式固定小球头的双动全髋髋臼假体
本专利技术属于医疗器械领域,具体涉及一种用于全髋关节置换的一种压配式固定小球头的双动全髋髋臼假体。
技术介绍
近些年,随着人口老龄化进程的加速,髋关节病患不断增加,年复合增长率达到20%,人工髋关节置换术成为许多终末期髋关节病患的有效治疗方法,通过置换,可以解决患者疼痛、活动困难及各类并发症,如:深静脉血栓、坠积性肺炎以及褥疮等高危疾病,并恢复患者髋关节的各项功能,有效提高生活质量。目前市场上流行的常规髋臼假体包含的部件如下:①金属外杯(需③髋臼螺钉或不需③髋臼螺钉)(下文简称“外杯”)、②超高分子量聚乙烯(或改性)内衬(下文简称“内衬”),①外杯与②内衬形成坚强固定,无相对运动,即无关节面,②内衬有一个半球形的内球形关节面(以“◎”示意)。此髋臼假体通过②内衬内球关节面“◎”与小球头外球关节面(以“○”示意)形成“杵臼关节”,小球头再与股骨柄相配形成整套髋关节假体。此类结构示意图详见图1。但是,此类关节假体对于复杂的髋部肌力松驰或受损疾病,如脑瘫、偏瘫、小儿麻痹后遗症以及臀中肌广泛损伤等,如进行传统的髋关节置换,则术后脱位率非常高。针对这种髋关节置换术后脱位,1970年代法国GillesBousquet和AndréRambert提出双动髋臼设计,其设计理念结合Charnley的低摩擦原则和MacKee的大头原则,为髋部初次置换和置换后反复脱位的翻修提供了一种选择。Homma等(HommaY,BabaT,KobayashiH,etal.Benefitandriskinshorttermaftertotalhipart ...
【技术保护点】
1.一种压配式固定小球头的双动全髋髋臼假体,其特征在于,从外到内的结构包括:外杯、内衬A和内衬B;所述外杯与内衬A形成坚强固定,无相对运动,即无关节面,所述内衬A具有一个半球形的内球关节面“◎”,所述内衬B由金属外壳和内衬组成,其中所述内衬镶嵌于金属外壳内;所述金属外壳具有一个半球形的外球关节面“○”,所述内衬具有一个半球形的内球关节面“◎”;所述内衬A的内球关节面“◎”与金属外壳的外球关节面“○”形成外关节,所述内衬的内球关节面“◎”与小球头的外球关节面“○”形成内关节,内关节和外关节两个关节形成双动全髋髋臼假体。
【技术特征摘要】
1.一种压配式固定小球头的双动全髋髋臼假体,其特征在于,从外到内的结构包括:外杯、内衬A和内衬B;所述外杯与内衬A形成坚强固定,无相对运动,即无关节面,所述内衬A具有一个半球形的内球关节面“◎”,所述内衬B由金属外壳和内衬组成,其中所述内衬镶嵌于金属外壳内;所述金属外壳具有一个半球形的外球关节面“○”,所述内衬具有一个半球形的内球关节面“◎”;所述内衬A的内球关节面“◎”与金属外壳的外球关节面“○”形成外关节,所述内衬的内球关节面“◎”与小球头的外球关节面“○”形成内关节,内关节和外关节两个关节形成双动全髋髋臼假体。2.根据权利要求1所述的一种压配式固定小球头的双动全髋髋臼假体,其特征在于,所述外杯为半椭球形,外径的长轴与短轴之比为0.5~2。3.根据权利要求2所述的一种压配式固定小球头的双动全髋髋臼假体,其特征在于,所述外杯无螺钉孔或开有将其固定于宿主骨的螺钉孔,螺钉...
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