申请人:Cardiac Pacemakers, Inc.
公开号:US20020165442A1
公开(公告)日:2002-11-07
A helical element for insertion into tissue comprises a helical element having an insertion end, a protruding end and an open central area within the wire, rods, filaments, cables or the like that form the helix. The helical element has at least its insertion end covered by a cap of a water-soluble or water-dispersible composition. The cap is provided with a surface shape in a cross-section in which surface variations are present in the cross-section which create a surface orientation where a line from the center of the cross-section can intersect the surface, and a line perpendicular to said radius at a point of intersection with said surface forms four quadrants, three of said quadrants containing water-soluble or water-dispersible cap material. There is either a hollow area within the composition within the open central area or the material is more porous than the remaining material. The helical element preferably comprises an electrical lead, such as a positive endocardial lead, with an electrode at the protruding or distal end of the lead.
The helical element may comprise any biocompatable material with sufficient structural integrity to provide a secure attachment to tissue in a patient. Where the helical element is also to provide an active (electrically active) function, the composition of the helical element should also be electrically conductive.
用于插入组织的螺旋元件包括一个螺旋元件,该螺旋元件具有一个插入端、一个突出端和一个开放的中心区域,该中心区域由金属丝、棒、丝、缆或类似物构成。螺旋元件的插入端至少有一个由水溶性或水分散性成分制成的盖子覆盖。盖子具有一个横截面的表面形状,在横截面上存在表面变化,从而形成一个表面方向,在这个方向上,从横截面中心出发的一条线可以与表面相交,在与所述表面的交点处,与所述半径垂直的一条线形成四个象限,其中三个象限含有水溶性或水分散性盖子材料。在开放的中心区域内的组合物中有一个中空区域,或者材料比其余材料更多孔。螺旋元件最好包括一根导线,如心内膜正极导线,导线的突出端或远端有一个电极。
螺旋元件可包括任何具有足够结构完整性的生物相容性材料,以便与患者组织牢固连接。如果螺旋元件还具有有源(电活性)功能,则螺旋元件的成分还应具有导电性。