Catheter-based system for delivery and retrieval of a leadless pacemaker
Catheter-based delivery systems for delivery and retrieval of a leadless pacemaker include features to facilitate improved manipulation of the catheter and improved capture and docking functionality of leadless pacemakers. Such functionality includes mechanisms directed to deflecting and locking a deflectable catheter, maintaining tension on a retrieval feature, protection from anti-rotation, and improved docking cap and drive gear assemblies.
1. A catheter-based system, comprising:
a handle including a housing having a longitudinal axis;
a first gear rotationally supported within and axially immovable relative to the housing; and
a second gear rotationally fixed relative to the housing, wherein the second gear is translatable along the housing between a first shuttle position and a second shuttle position, wherein the first gear and the second gear are engaged in the first shuttle position, and wherein the first gear and the second gear are disengaged in the second shuttle position.
2. The catheter-based system of claim 1 further comprising a torsion release assembly including the first gear and a rotational mount supported within the housing.
3. The catheter-based system of claim 2 , wherein the rotational mount includes a ball bearing.
4. The catheter-based system of claim 1 , wherein the first gear includes a gear shaft coupled to a gear hub.
5. The catheter-based system of claim 1 further comprising a shuttle assembly including the second gear and a shuttle body from which one or more grip features extend.
6. The catheter-based system of claim 5 , wherein the one or more grip features extend through the housing.
7. The catheter-based system of claim 1 , wherein the second gear defines the longitudinal axis, wherein the second gear includes a first half having a first guide surface, and a second half having a second guide surface, and wherein the first guide surface and the second guide surface are oriented at respective angles to a cross-sectional plane that is normal to the longitudinal axis.
8. The catheter-based system of claim 1 further comprising a snare fixed relative to the first gear, wherein a catheter is coupled to the second gear, and wherein the snare extends through the catheter such that translation of the second gear along the housing between the first shuttle position and the second shuttle position draws the snare into the catheter to cinch the snare.
9. The catheter-based system of claim 1 , wherein the first gear is rotationally fixed to the housing in the first shuttle position, and wherein the first gear is freely rotatable relative to the housing in the second shuttle position.
10. A leadless pacemaker system, comprising:
a leadless pacemaker having a coupling feature; and
a catheter-based system including
a handle including a housing having a longitudinal axis,
a first gear rotationally supported within and axially immovable relative to the housing, and
a second gear rotationally fixed relative to the housing, wherein the second gear is translatable along the housing between a first shuttle position and a second shuttle position, wherein the first gear and the second gear are engaged in the first shuttle position, and wherein the first gear and the second gear are disengaged in the second shuttle position.
11. The leadless pacemaker system of claim 10 further comprising a torsion release assembly including the first gear and a rotational mount supported within the housing.
12. The leadless pacemaker system of claim 10 , wherein the first gear includes a gear shaft coupled to a gear hub.
13. The leadless pacemaker system of claim 10 further comprising a shuttle assembly including the second gear and a shuttle body from which one or more grip features extend.
14. The leadless pacemaker system of claim 10 , wherein the second gear defines the longitudinal axis, wherein the second gear includes a first half having a first guide surface, and a second half having a second guide surface, and wherein the first guide surface and the second guide surface are oriented at respective angles to a cross-sectional plane that is normal to the longitudinal axis.
15. The leadless pacemaker system of claim 10 further comprising a snare fixed relative to the first gear, wherein a catheter is coupled to the second gear, and wherein the snare extends through the catheter such that translation of the second gear along the housing between the first shuttle position and the second shuttle position draws the snare into the catheter to cinch the snare.
16. The leadless pacemaker system of claim 10 , wherein the first gear is rotationally fixed to the housing in the first shuttle position, and wherein the first gear is freely rotatable relative to the housing in the second shuttle position.