Leadless cardiac pacemaker with anti-unscrewing feature

摘要

A leadless cardiac pacemaker comprises a housing, a plurality of electrodes coupled to an outer surface of the housing, and a pulse delivery system hermetically contained within the housing and electrically coupled to the electrode plurality, the pulse delivery system configured for sourcing energy internal to the housing, generating and delivering electrical pulses to the electrode plurality. The pacemaker further comprises an anti-unscrewing feature disposed on either a fixation device of the pacemaker or on the housing itself. The anti-unscrewing feature can be configured to prevent the fixation device from disengaging the wall of the heart.

主权项

1. A leadless biostimulator, comprising:
a housing sized and configured to be implanted within a heart of a patient; a primary fixation helix attached to the housing and configured to affix the housing to a wall of the heart by rotating in a screwing direction; and an anti-unscrewing feature disposed on the primary fixation helix or the housing, the anti-unscrewing feature angled in a direction opposite the screwing direction of the primary fixation device so that rotation of the primary fixation helix only in an unscrewing direction causes the anti-unscrewing feature to engage the wall of the heart so as to prevent the primary fixation device from disengaging the wall of the heart.