Leadless Cardiac Pacemaker with Secondary Fixation Capability

• US 20100198288A1
• Filed: 02/02/2010
• Published: 08/05/2010
• Est. Priority Date: 02/02/2009
• Status: Active Grant

• Current Assignee: Pacesetter Incorporated (Abbott Laboratories)
• Original Assignee: Nanostim, Inc (Abbott Laboratories)
• Inventors: Ostroff, Alan
• Granted Patent: US 8,527,068 B2
• Time in Patent Office: Days
• US Class Current: 607/9
• CPC Class Codes: A61N 1/0573 chacterised by means penetrating the heart tissue, e.g. helix needle or hook
• CPC Class Codes: A61N 1/37512 Pacemakers
• CPC Class Codes: A61N 1/37518 Anchoring of the implants, e.g. fixation
• CPC Class Codes: A61N 1/3756 Casings with electrodes thereon, e.g. leadless stimulators

Abstract

The invention relates to leadless cardiac pacemakers (LBS), and elements and methods by which they affix to the heart. The invention relates particularly to a secondary fixation of leadless pacemakers which also include a primary fixation. Secondary fixation elements for LBS'"'"'s may passively engage structures within the heart. Some passive secondary fixation elements entangle or engage within intraventricular structure such as trabeculae carneae. Other passive secondary fixation elements may engage or snag heart structures at sites upstream from the chamber where the LBS is primarily affixed. Still other embodiments of passive secondary fixation elements may include expandable structures.

Claims

1. A leadless biostimulator comprising:

a housing sized and configured to be disposed within a heart chamber of a human;

a primary fixation element configured to affix the biostimulator to a heart wall within the heart chamber; and

a passive secondary fixation element configured to prevent an escape of the biostimulator from the heart chamber when the primary fixation element is not affixed to the heart wall, the passive secondary fixation element comprising a tail portion sized and configured to extend from the heart chamber into a second heart chamber without being attached to the human.

2. The leadless biostimulator of claim 1 wherein the passive secondary fixation element is sized and configured to be fully disposed within the heart.

3. The leadless biostimulator of claim 1 wherein the heart chamber is a right ventricle of the heart and the second heart chamber is a right atrium of the heart, wherein the passive secondary fixation element is sized and configured to extend from the right ventricle through a tricuspid valve into the right atrium.

4. The leadless biostimulator of claim 1 wherein the passive secondary fixation element is configured to be grasped by a retrieval tool.

5. The leadless biostimulator of claim 1 wherein the passive secondary fixation element is of sufficient stiffness to prevent a dislodged leadless biostimulator from turning or reorienting itself within the heart chamber.

6. The leadless biostimulator of claim 1 wherein the passive secondary fixation element comprises silicone.

7. The leadless biostimulator of claim 1 wherein the passive secondary fixation element comprises polyurethane or any suitable polymer.

8. The leadless biostimulator of claim 1 wherein the passive secondary fixation element comprises a flexible metallic core.

9. The leadless biostimulator of claim 8 wherein the passive secondary fixation element comprises multifilar windings around the flexible metallic core.

10. The leadless biostimulator of claim 1 wherein the passive secondary fixation element comprises an atraumatic tip.

11. A method of retaining a leadless biostimulator within a human heart of a patient, comprising:

delivering the leadless biostimulator to a heart chamber;

affixing a primary fixation element of the leadless biostimulator to a heart wall of the heart chamber; and

extending a passive secondary fixation element of the leadless biostimulator from the heart chamber to a second heart chamber without attaching the passive secondary fixation element to the patient.

12. The method of claim 11 wherein the passive secondary fixation element is sized and configured to be fully disposed within the human heart.

13. The method of claim 11 wherein the heart chamber is a right ventricle of the heart and the second heart chamber is a right atrium of the heart.

14. The method of claim 13 wherein the passive secondary fixation element is extended from the right ventricle to the right atrium through a tricuspid valve.

15. The method of claim 11 wherein the passive secondary fixation element is of sufficient stiffness to prevent a dislodged leadless biostimulator from turning or reorienting itself within the heart chamber.