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    • 5. 发明授权
    • System and method for positioning an implantable medical device within a body
    • 将可植入医疗装置定位在体内的系统和方法
    • US06909920B2
    • 2005-06-21
    • US09844628
    • 2001-04-27
    • Nicolaas M. LokhoffDavid L. Thompson
    • Nicolaas M. LokhoffDavid L. Thompson
    • A61N1/05
    • A61N1/057A61N2001/0585
    • A transvenous implantable medical device adapted for implantation in a body, and which is particularly adapted for use in a vessel such as the coronary sinus or cardiac great vein. The implantable medical device may take the form of a lead or catheter, and includes an extendable distal fixation member such as a helix. In one embodiment, the fixation member is a helix constructed of a shape memory metal or other super-elastic material. Upon deployment, the helix assumes a predetermined helix shape larger than the diameter of the lead body diameter. The helix functions to wedge or fix the lead within the vessel in a manner that does not impede the flow of blood through the vessel. The helix may be retracted for ease of repositioning and/or removal. In one embodiment of the invention, the fixation member may be advanced using a stiffening member such as a stylet. In another embodiment, the helix is coupled to a coiled conductor such that rotation of the conductor extends or retracts the helix. According to yet another aspect of the invention, a helix lumen including a flexible fluid-tight seal may be utilized to house the helix when it is in the retracted position.
    • 一种经静脉植入式医疗装置,适于植入体内,特别适用于血管如冠状窦或心脏大静脉。 可植入医疗装置可以采用导联或导管的形式,并且包括可延伸的远端固定构件,例如螺旋。 在一个实施例中,固定构件是由形状记忆金属或其它超弹性材料构成的螺旋。 在部署时,螺旋呈现比引线体直径的直径大的预定螺旋形状。 螺旋线用于以不妨碍血液通过血管的方式楔入或固定血管内的引线。 螺旋可以缩回以便于重新定位和/或移除。 在本发明的一个实施例中,固定构件可以使用诸如探针的加强构件前进。 在另一个实施例中,螺旋连接到螺旋导体,使得导体的旋转延伸或缩回螺旋。 根据本发明的另一方面,当螺旋管处于缩回位置时,可以使用包括柔性流体密封的螺旋管来容纳螺旋。