The utility model discloses an anti rotation hollow screw, which comprises a hollow nail body, a plurality of first through holes are arranged on the outer side wall of the hollow nail body at intervals, the hollow nail body is inserted into an inner core, the inner core side wall is respectively provided with a second through hole corresponding to each first through hole position, the inner core inner wall is provided with a guide rod, each guide rod is respectively installed with a side nail, the side nail includes a turbine end and a self drilling self tapping screw A guide hole is arranged in the middle of the head and the turbine end, the guide rod is inserted into the guide hole, a number of turbine teeth are arranged outside the turbine end at intervals, the screw teeth with screw structure are arranged at the corresponding positions of the screw teeth on the worm, the adjusting block is arranged at one end of the worm near the head of the hollow nail body; the lower bearing groove and the upper bearing groove are respectively embedded with the lower bearing and the upper bearing, and the upper bearing groove is respectively embedded with the upper bearing The upper part is embedded with a sealing cover, two sides of the inner core and outer wall are respectively symmetrically provided with a limit block inserted into the card slot; the adjusting block is connected with the wrench, and the head of the hollow nail body is provided with a limit cover.
【技术实现步骤摘要】
一种防旋空心螺钉
本技术涉及医疗器械领域,具体为一种防旋空心螺钉。
技术介绍
空心钉体是用于骨折手术中对骨折断端加压固定的内固定器械,使用于四肢干骺端、骨盆骨折,不规则骨折的内固定,不同直径空心钉用于不同的骨折类型,直径3.0mm通常用于舟状骨骨折、小骨折撕脱,4.0mm直径通常用于骨骺骨折,6.5mm及7.3mm常用于股骨近端骨折及股骨髁骨折。使用时首先闭合复位骨折,经皮置入定位导针,在C壁下透视观察导针位置,若需要置入多颗空心钉体则使用带有可调节套管的平行导向器平行拧入其余导针,使用空心钻头开口,空心改锥拧入拉力空心钉体。现有空心钉体多为柱状结构,单颗空心钉可以对骨折提供加压,对垂直于骨折线方向提供固定,对于抗扭转主要依靠骨折断端之间的摩擦力以及空心钉与骨块之间摩擦力,抗扭转效果不可靠。在舟状骨、小骨块撕脱、骨骺骨折、胫骨平台骨折中由于骨量有限,有时只能植入一颗空心钉进行加压固定,骨折断端可能产生旋转位移,导致骨折畸形愈合,影响关节功能。在股骨近端承受较大扭转应力,骨折中往往采用倒品字型置入三颗空心钉螺钉,从而提 ...
【技术保护点】
1.一种防旋空心螺钉,其特征在于,包括空心钉体(1),空心钉体(1)尾部外表设置有螺纹面(2),头部开口处两侧分别对称设置有一个卡槽(3),空心钉体(1)外部侧壁上间隔设置若干第一通孔(4),空心钉体(1)内插入内芯(5),内芯(5)侧壁对应各第一通孔(4)位置处分别设置有第二通孔(6),内芯(5)远离第二通孔(6)一侧的内壁与各第二通孔(6)正对位置处分别设置一个导向杆(7),各导向杆(7)上分别安装一个侧钉(8);/n侧钉(8)包括涡轮端(9)和自钻自攻螺钉头(10),涡轮端(9)中部设置有导向孔(11),导向杆(7)插入导向孔(11)内,涡轮端(9)外部间隔设置有若干 ...
【技术特征摘要】
1.一种防旋空心螺钉,其特征在于,包括空心钉体(1),空心钉体(1)尾部外表设置有螺纹面(2),头部开口处两侧分别对称设置有一个卡槽(3),空心钉体(1)外部侧壁上间隔设置若干第一通孔(4),空心钉体(1)内插入内芯(5),内芯(5)侧壁对应各第一通孔(4)位置处分别设置有第二通孔(6),内芯(5)远离第二通孔(6)一侧的内壁与各第二通孔(6)正对位置处分别设置一个导向杆(7),各导向杆(7)上分别安装一个侧钉(8);
侧钉(8)包括涡轮端(9)和自钻自攻螺钉头(10),涡轮端(9)中部设置有导向孔(11),导向杆(7)插入导向孔(11)内,涡轮端(9)外部间隔设置有若干涡轮齿(12),自钻自攻螺钉头(10)正对第二通孔(6)且与第二通孔(6)内壁螺纹连接;内芯(5)内于侧钉(8)一侧设置有垂直于侧钉(8)方向的蜗杆槽(13),蜗杆槽(13)内对应各涡轮端(9)位置处分别设置有一个螺纹齿槽(14),蜗杆槽(13)内嵌入一根蜗杆(15),蜗杆(15)上对应各螺纹齿槽(14)位置处设置有螺旋结构的螺纹齿(16),螺纹齿(16)与对应涡轮端(9)的涡轮齿(12)相互咬合,蜗杆(15)靠近空心钉体(1)头部一端设置有正方体结构的调节块(17);蜗杆槽(13)内远离空心钉体(1)头部一端设置有下轴承槽(18),靠近空心钉体(1)头部一端设置有上轴承槽(19),下轴承槽(18)和上轴承槽(19)内分别嵌装有下轴承(20)和上轴承(21),蜗杆(15)两端分别穿过下轴承(20)和上轴承...
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