Patent ID: 9119959
Filing Date: 2015-09-01
Classification: A61N

Abstract:
1. A fixation subassembly for an implantable medical device, the device comprising a hermetically sealed housing that defines a longitudinal axis of the device, and a distal end of the housing including tabs formed therein, the tabs being configured to secure attachment of the fixation subassembly to the housing; and the subassembly comprising: at least one tissue-penetrating fixation component formed from a superelastic wire, the component including a base portion, a first tine portion, and a second tine portion, each tine portion including a hook segment and a distal segment terminated by a tissue-piercing tip, each hook segment having one of: a round cross-section and an elliptical cross-section, each distal segment having a flattened, or approximately rectangular cross-section, each hook segment being pre-set to extend along a curvature that encloses an angle of between 135 degrees and 270 degrees, from a proximal end thereof to a distal end thereof, each distal segment being pre-set to extend along a straight line, tangent to the distal end of the hook segment, from the distal end of the hook segment to the tip, the base portion extending between the proximal ends of the hook segment and defining a longitudinal axis of the subassembly, the axis of the subassembly being aligned with the longitudinal axis of the device, when attached thereto, and the hook segment being elastically deformable from the pre-set curvature to an open position, wherein the cross-section of the hook segment is defined as being perpendicular in relation to a longitudinal axis of the fixation component; an insulative locking member including a collar and a body extending therefrom, the collar including a plurality of notches formed in an outer perimeter surface thereof, the notches being spaced apart from one another about the perimeter; and an insulative retainer including an internal surface and a perimeter groove, the internal surface defining an opening in which the body of the locking member is received such that the collar of the locking member extends over the groove of the retainer, and the groove receiving the base portion of each of the at least one fixation component therein such that each hook segment of the at least one fixation component extends through one of the plurality of notches of the collar of the locking member.