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    • 105. 发明申请
    • PLASTICS IMPLANT REVISION AND REMOVAL SYSTEM
    • 塑料植入修改和拆除系统
    • WO2016009167A1
    • 2016-01-21
    • PCT/GB2015/000216
    • 2015-07-20
    • SRA DEVELOPMENTS LIMITED
    • YOUNG, Michael John Radley
    • A61B17/16A61B17/88A61B17/92
    • A61B17/921A61B17/1615A61B17/1631A61B17/164A61B17/17A61B17/320068A61B17/3423A61B17/3472A61B17/7275A61B17/8847A61B17/8863A61B2017/320072
    • A fractured hollow bone (1) can be supported by forming a rigid plastics implant (5) within a cavity (2) of the bone (1), extending across the fracture (4). An access port (7) is used to aid removal or revision of the implant (5). This comprises a hollow cylinder (9), a distal end of which is inserted through an aperture (16) in an end of the bone (1) into the cavity (2) to surround a proximal end (15) of the implant (5). The access port (7) is connectable to a source of torsional-mode ultrasonic vibrations, which soften the plastics material of the implant (5), improving engagement between the implant (5) and a threaded formation (11) within the distal end of the access port (7). Removal of the source of ultrasonic vibrations allows the access port (7) to act as a guide passage (14), in line with the elongate implant (5). A cutting tool introduced through the access port (7) is thus guided so that it can be used to hollow out the implant (5). Once sufficiently hollowed-out, the implant (5) collapses within its surrounding balloon (6). The engagement of the access port (7) with the proximal end (15) of the implant (5) allows the implant (5) and balloon (6) to be drawn out of the cavity (2). A particularly suitable cutting tool has a roughly cylindrical operative head (21) comprising four equally- spaced fins (24) separated by four part-circular grooves (25). The fins (24) and grooves (25) extend helically between the distal (26) and proximal (28) ends of the operative head (21). The distal end (26) is concave. When activated by torsional-mode ultrasonic vibrations, the distal tips of the fins (24) in particular produce an effective longitudinal cutting action. Debris and softened plastics material flow proximally along the grooves (25) away from the distal end (26) where most cutting occurs.
    • 骨折的中空骨(1)可以通过在骨骼(1)的空腔(2)内形成刚性的塑料植入物(5)来支撑,延伸穿过骨折(4)。 进入口(7)用于帮助植入物(5)的移除或修复。 这包括中空圆筒(9),其远端通过骨头(1)的端部中的孔(16)插入空腔(2)中,以围绕植入物(5)的近端(15) )。 进入口(7)可连接到扭转模式的超声波振动源,其软化植入物(5)的塑料材料,改善植入物(5)与螺纹结构(11)之间的接合 访问端口(7)。 移除超声振动源允许进入口(7)作为与细长植入物(5)一致的引导通道(14)。 因此,通过进入口(7)引入的切削工具被引导,使得其可以用于挖出植入物(5)。 一旦充分挖空,植入物(5)在其周围的气囊(6)内塌缩。 进入口(7)与植入物(5)的近端(15)的接合允许植入物(5)和球囊(6)从空腔(2)中拉出。 特别合适的切削工具具有大致圆柱形的操作头部(21),其包括由四个部分圆形凹槽(25)分开的四个等间隔的翅片(24)。 翅片(24)和凹槽(25)在操作头部(21)的远端(26)和近端(28)端部之间螺旋地延伸。 远端(26)是凹的。 当由扭转模式的超声波振动激活时,翅片(24)的远端特别产生有效的纵向切割动作。 碎屑和软化的塑料材料沿着远离远端(26)的凹槽(25)向近侧流动,其中发生大多数切割。