| CPC A61N 1/05 (2013.01) [B33Y 10/00 (2014.12); B33Y 30/00 (2014.12); B33Y 80/00 (2014.12)] | 16 Claims | 

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               1. An implantable apparatus comprising: 
            a body defining a distal end region extending along a distal end region axis; and 
                two alignable marker elements coupled to the body within the distal end region, wherein each of the two alignable marker elements defines a complementary shape that complements the other alignable marker element such that, when the distal end region is viewed axially, the two alignable marker elements form a fiducial shape indicative of acceptable alignment of the distal end region for positioning at a target site. 
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