Leadless cardiac pacemaker with anti-unscrewing feature
First Claim
Patent Images
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.
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Accused Products
Abstract
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.
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Citations
20 Claims
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1. A leadless biostimulator, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A leadless biostimulator, comprising:
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a housing sized and configured to be implanted within a heart of a patient; a primary fixation device attached to the housing and configured to affix the housing to a wall of the heart; and an anti-unscrewing feature disposed on the primary fixation device, the anti-unscrewing feature angled to provide asymmetric torque providing the primary fixation device with more rotational friction in an unscrewing direction than in a screwing direction, so as to prevent the primary fixation device from disengaging the wall of the heart. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A leadless biostimulator, comprising:
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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 in a screwing direction; and sutures disposed on the primary fixation helix or the housing, the sutures configured to point in a direction opposite the primary fixation helix such that rotation of the housing in an unscrewing direction causes the sutures to engage the wall of the heart so as to prevent the primary fixation helix from disengaging the wall of the heart.
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Specification