Abstract: A leadless biostimulator, such as a leadless cardiac pacemaker, having a header assembly that includes overmolded components, is described. The header assembly includes a helix mount overmolded on a flange of an electrical feedthrough assembly. A fixation element is mounted on the helix mount. The overmolded helix mount fills a recess in an outer surface of the flange to robustly join the header assembly components. The electrical feedthrough assembly includes an electrode contained within the flange to deliver electrical impulses to a target anatomy, and an insulator that separates the electrode from the flange. The overmolded helix mount can conform or adhere to the outer surfaces of the flange and the insulator to electrically isolate the electrode from the flange. Other embodiments are also described and claimed.

Abstract: A leadless biostimulator, such as a leadless cardiac pacemaker, having a header assembly that includes overmolded components, is described. The header assembly includes a helix mount overmolded on a flange of an electrical feedthrough assembly. A fixation element is mounted on the helix mount. The overmolded helix mount fills a recess in an outer surface of the flange to robustly join the header assembly components. The electrical feedthrough assembly includes an electrode contained within the flange to deliver electrical impulses to a target anatomy, and an insulator that separates the electrode from the flange. The overmolded helix mount can conform or adhere to the outer surfaces of the flange and the insulator to electrically isolate the electrode from the flange. Other embodiments are also described and claimed.

Abstract: Setscrews for implantable medical devices include multiple drive features. The drive features may include a first or primary drive feature (such as a hex socket) and a second drive feature that can be engaged independently from the first drive feature such that the second drive feature may be used to extract the setscrew in the event the first drive feature is damaged or obstructed. The second drive feature may extend laterally and/or longitudinally beyond the first drive feature. Examples of second drive features include, without limitation, slots, sockets, extensions/protrusions, and counter-threaded bores. Spacers for use with implantable devices including elastomeric septums are further provided to prevent damage to the septum and obstruction of the primary drive feature during backing out of the setscrew.