TRANS-SEPTAL IMPLANTABLE MEDICAL DEVICE
FIG9 is a schematic view of an IMD in combination with a delivery device in accordance with the disclosure
FIG9 provides an example of implanting the IMD 90 proximate the ventricular septum 10. As illustrated, the first RV electrode 100 and the second RV electrode 102 are both ring electrodes, but this is not required. The IMD 90 is secured within a delivery device 120, which includes an implantation tool 122 that extends within the delivery device 120 and that may be used for several purposes. For example, the implantation tool 122 may engage the tether loop 94 to hold the IMD 90 relative to the delivery device 120 while delivering the IMD 90 to the implantation site. In some cases, the implantation tool 122 may subsequently be used to rotate the tether loop 94 relative to the housing of the IMD 90 and thus extend or retract the outer shaft 96 bearing the LV electrode 98. As shown, the LV electrode 98 is proximate the LV facing side 14 of the ventricular septum 10. In some cases, the LV electrode 98 may instead be disposed within the ventricular septum 10, at an intermediate depth between the RV facing side 12 of the ventricular septum 10 and the LV facing side 14 of the ventricular septum 10. In some cases, a plurality of LV electrodes may be provided, each at a different position along the outer shaft 96 so that each is at a different depth in the ventricular septum 10. The circuitry 26 may include a selector (not explicitly shown) to select which one (or more) of the plurality of LV electrodes to use.
schematic view
14
LV facing side
12
RV facing side
98
LV electrode
94
tether loop
96
outer shaft
93
distal end
104
fixation tines
102
second RV electrode
10
ventricular septum
26
circuitry
120
delivery device
["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).", '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.', '5. The IMD of any one of claims 1 to 4, wherein the coupling comprises a rotatable tether loop coupled to a proximal end of the inner shaft, such that rotating the rotatable tether loop rotates the inner shaft relative to the outer shaft, thereby causing the outer shaft to translate in response.', '7. The IMD of any one of claims 2 to 6, further comprising one or more fixation tines that are configured to extend into the ventricular septum and curve over to anchor the IMD in place relative to the ventricular septum.']