US 9,808,618 B2
Dual chamber intracardiac medical device
Wade M Demmer, Coon Rapids, MN (US)
Assigned to Medtronic, Inc., Minneapolis, MN (US)
Filed by Medtronic, Inc., Minneapolis, MN (US)
Filed on Apr. 23, 2015, as Appl. No. 14/694,775.
Prior Publication US 2016/0310722 A1, Oct. 27, 2016
This patent is subject to a terminal disclaimer.
Int. Cl. A61N 1/39 (2006.01); A61N 1/362 (2006.01); A61N 1/05 (2006.01); A61N 1/375 (2006.01); A61N 1/372 (2006.01); A61N 1/365 (2006.01)
CPC A61N 1/059 (2013.01) [A61N 1/362 (2013.01); A61N 1/36592 (2013.01); A61N 1/3756 (2013.01); A61N 1/37205 (2013.01); A61N 1/37217 (2013.01); A61N 1/37264 (2013.01); A61N 2001/37294 (2013.01)] 23 Claims
OG exemplary drawing
 
1. An implantable pacemaker, comprising:
a first housing enclosing a first pulse generator configured for delivering first pacing pulses to a first heart location via at least one first electrode carried by the first housing;
a second housing enclosing a second pulse generator configured for delivering second pacing pulses to a second heart location spaced apart from the first heart location via at least one second electrode carried by the second housing; and
an elongated electrical conductor having a proximal end and a distal end, the proximal end coupled to the first housing and the distal end coupled to the second housing to tether the first housing and the second housing together, the elongated electrical conductor comprising a signal line configured to carry an electrical signal between the first housing and the second housing,
the first housing comprising a first fixation feature configured to fix the first housing at the first heart location with a first fixation force that requires a first pulling force to dislodge the first housing from the first heart location;
the second housing comprising a second fixation feature configured to fix the second housing at the second heart location with a second fixation force that requires a second pulling force to dislodge the second housing from the second heart location, the second fixation force of the second fixation feature being less than the first fixation force of the first fixation feature so that the first pulling force required to dislodge the first housing is greater than the second pulling force required to dislodge the second housing to cause the second housing to preferentially dislodge from the second heart location instead of the first housing being dislodged from the first heart location in response to tensile forces along the elongated electrical conductor.