The utility model relates to the technical field of medical equipment, in particular to a cancellous bone screw, which is specially used for the fixation of the cancellous bone of a joint avulsion fracture, including a screw and a screw cap, a screw and a nut, which has a through hole along the axis line, a tip on the head side of the screw, the screw cap on the tail side of the screw rod, and the diameter of the nut is larger than the screw. The diameter 0.4~0.6mm, the thickness of the nut is 0.3~0.4mm, the screw has three threads on the screw, and the difference between each spiral line on the cross section of the screw is 120 degrees; the smaller nut is left outside the bone. The screw is left in the body after the fracture of the fracture in the joint, and it does not affect the health, and the remaining nut is also loose. The quality bone produces a certain tension, the tensile strength is greater, which is beneficial to the restoration of the cancellous bone; the tension of the cross section of the three thread on the screw is greater and the strength of the transverse stress of the two bones is greater, and the strength of the whole screw will not be reduced by the opening of the screw in the middle of the screw, so that the screw will not break in the bone. No reoperation.
【技术实现步骤摘要】
一种松质骨螺钉
本技术涉及医疗器械
,具体涉及一种松质骨螺钉,专门用于关节内撕脱骨折的松质骨固定。
技术介绍
骨是一种具有独特结构的高密度结缔组织,在结构上主要分为皮质骨、松质骨。其中松质骨占人体骨量的20%,但构成80%的骨表面。松质骨的骨密度低于皮质骨,而富有弹性;松质骨的脚手架结构有助于维持骨骼形态,抵抗压力,构成绝大部分的中轴骨如颅骨、肋骨、脊柱骨。松质骨螺钉,属于骨科用器械,它包括螺杆,所述螺杆的前端部舍友松质骨螺纹,在尾部螺钉帽内侧的螺杆上有一段与前端松质骨螺纹同方向旋转的后端螺纹,增强了螺钉的加压作用,填充了前端螺纹的遗留空隙,预防远期退钉。松质骨螺钉一般用在松质骨关节内撕脱骨折上,当松质骨撕脱性骨折后用松质骨螺钉(法螺钉)进行固定,但是由于现有使用的松质骨螺钉的螺帽较大,在钉入松质骨内后螺帽遗留在外的部分较多,松质骨在后期修复好后还要讲该螺钉取出来,影响病人恢复,还加大医生工作量;还有一种沉头松质骨螺钉,没有螺帽边沿的螺钉整个没入骨头内导致拉力有限,拉不住撕脱性骨折的松质骨,恢复较慢;另一方面,由于螺杆上沿着轴心线开有通孔,螺杆只有一道螺纹的自攻松质骨螺钉连接两道骨头的时候容易在横切拉力作用下断裂,强度较小,断裂后更不利于骨头的生长恢复,同样给医生和患者都造成麻烦。
技术实现思路
鉴于现有技术中存在的技术问题,本技术提供一种强度更高、对骨头拉力更强、使关节内撕脱骨折更快恢复的松质骨螺钉。为实现上述技术目的,本技术采用的技术方案如下:一种松质骨螺钉,包括螺杆、螺帽,所述螺杆和螺帽沿着轴心线开设有通孔,所述螺杆的头侧有一尖端部,螺帽在螺杆的尾 ...
【技术保护点】
1.一种松质骨螺钉,包括螺杆、螺帽,所述螺杆和螺帽沿着轴心线开设有通孔,所述螺杆的头侧有一尖端部,螺帽在螺杆的尾侧,其特征在于:所述螺帽的直径大于螺杆的直径0.4~0.6mm,所述螺帽的厚度为0.3~0.4mm,所述螺杆上设有三头螺纹,在螺杆的横截面上的每个螺旋线之间相差120°,所述三头螺纹的起始端始于尖端部尾侧、螺杆的头侧。
【技术特征摘要】
1.一种松质骨螺钉,包括螺杆、螺帽,所述螺杆和螺帽沿着轴心线开设有通孔,所述螺杆的头侧有一尖端部,螺帽在螺杆的尾侧,其特征在于:所述螺帽的直径大于螺杆的直径0.4~0.6mm,所述螺帽的厚度为0.3~0.4mm,所述螺杆上设有三头螺纹,在螺杆的横截面上的每个螺旋线之间相差120°,所述三头螺纹的起始端始于尖端部尾侧、螺杆的头侧。2.根据权利要求1所述的一种松质骨螺钉,其...
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