TRANS-SEPTAL IMPLANTABLE MEDICAL DEVICE
FIG3 is a schematic block diagram of an implantable medical device (IMD) in accordance with the disclosure
FIG3 is a highly schematic illustration of an IMD 50 that may be configured for deployment within a heart chamber of a patient's heart, near a septum of the heart. The septum may be considered as having a first chamber facing side that faces the heart chamber and a second opposing chamber facing side. In some cases, the heart chamber may be the RV, and thus the septum in question is the ventricular septum 10, having an RV facing side 12 and an LV facing side 14. This is merely illustrative, as for example the IMD 50 may be implantable within the RA, meaning that the septum in question is the atrial septum 11, having an RA facing side 13 and an LA facing side 15. The IMD 50 includes a housing 52 having a proximal end 51 and a distal end 53. Returning to FIG3, the adjustment mechanism 60 may include a coupling 72 that may, for example, be rigidly coupled to the inner shaft 68 such that rotation of the coupling 72 produces rotation of the inner shaft 68. The coupling 72 may be configured such that a separate adjustment tool may be mated with the coupling 72. In some cases, the adjustment tool may be used to rotate the coupling 72 to rotate the inner shaft 68. In some cases, the coupling 72 may, for example, represent a tether loop. Rotating the tether loop may cause the inner shaft 68 to rotate in the same direction as the tether loop, and the rotation of the inner shaft 68 relative to the outer shaft 66 while the outer shaft 66 is constrained from rotating causes translation of the outer shaft 66 relative to the housing 52. It is contemplated that the coupling may be a mechanical coupling, an electrical coupling, a hydraulic coupling and/or any other suitable coupling as desired, depending on the type of LV electrode position adjustment assembly 40 used.
schematic block diagram
24
power source
72
coupling
20
IMD
52
housing
66
outer shaft
53
distal end
26
circuitry
58
lumen
60
adjustment mechanism
68
inner shaft
["1. An implantable medical device (IMD) configured for deployment at a ventricular septum of a patient's heart, the ventricular septum of the patient's heart having a right ventricle (RV) facing side and a left ventricle (LV) facing side, the IMD comprising: a housing having a proximal end and a distal end, the housing configured to be positioned at least in part in the right ventricle (RV) of the patient's heart with the distal end of the housing proximate the RV facing side of the ventricular septum once the IMD is implanted in the patient's heart; a power source (24) disposed within the housing; circuitry (26) disposed within the housing and operatively coupled to the power source; a first RV electrode (28) adjacent the distal end of the housing and positioned to be facing the RV facing side of the ventricular septum once the IMD is implanted, the first RV electrode operatively coupled with the circuitry in the housing; a second RV electrode (32) spaced proximally of the first RV electrode, the second RV electrode operatively coupled with the circuitry in the housing; an LV electrode (36) positioned distally of the first RV electrode and at least partially in the ventricular septum once the IMD is implanted, the LV electrode operatively coupled with the circuitry in the housing; and an LV electrode position adjustment assembly for adjusting a distance that the LV electrode is positioned distally of the first RV electrode, wherein the LV electrode position adjustment assembly comprises a coupling secured relative to the housing, wherein the coupling is configured to mate with a separate adjustment tool that can move the coupling relative to the housing to adjust the distance that the LV electrode is positioned distally of the first RV electrode, characterized in that  the IMD is a dual chamber leadless cardiac pacemaker (LCP).", '2. The IMD of claim 1, wherein the LV electrode position adjustment assembly comprises a fixation helix extending distally from the housing, with the LV electrode positioned on the fixation helix, the fixation helix including a proximal shaft portion extending through a lumen of the housing and terminating in the coupling such that rotating the coupling rotates the  fixation helix relative to the housing and causes the fixation helix to thread itself into the ventricular septum.', '3. The IMD of claim 1, wherein the LV electrode position adjustment assembly comprises: an inner shaft operatively coupled to the coupling; and an outer shaft threadedly engaged with the inner shaft and configured to not rotate relative to the housing, wherein rotation of the inner shaft via the coupling results in translation of the outer shaft relative to the housing, wherein the LV electrode is secured relative to the outer shaft and translates with the outer shaft.']