On July 7, 2026, the US Patent and Trademark Office issued US12672829B2, “System for determining change in position of an implanted medical device within an implant pocket,” assigned to Pacesetter, Inc. — the former St. Jude Medical cardiac-rhythm business, now an Abbott subsidiary; the assignee of record is Pacesetter, Inc. This is a granted patent, not a pending application. The named inventors are Jong Gill and Fady Dawoud, and the record is classified under CPC A61B 5/686, covering means for detecting the position of implanted devices in the body, with A61B 5/0031 and A61B 5/103. This Claims Brief reads the independent claim in plain terms.

The clinical problem is device migration. An implantable cardiac device is placed in a surgically created pocket, and over time it can rotate or flip inside that pocket. A shifted device can affect sensing, therapy delivery, or lead tension. The claimed invention is directed to catching that shift from the device’s own accelerometer, without imaging, by exploiting a discrepancy between what the patient is doing and what the accelerometer reports.

What the independent claim covers

Claim 1 recites a system comprising an accelerometer configured to be implanted in a patient and to obtain accelerometer data along at least one axis, memory storing program instructions, and one or more processors. Executing those instructions, the processors are configured to perform an ordered sequence. First, they determine when the patient is engaging in a determined activity associated with a standing posture — the anchor of the whole method, because the system establishes independently that the patient should be upright. Responsive to that determination, they obtain accelerometer data during an activity period. They then identify postures indicated by that data over the activity period, the postures including a non-standing posture. They determine a duration of one or more posture periods corresponding to the non-standing posture. Finally, they identify a migration of the implanted medical device within the implant pocket based on the duration of the non-standing posture exceeding a duration threshold.

The logic the claim encodes is a contradiction test. The system already knows, from the determined standing activity, that the patient is upright. If the accelerometer nonetheless reports a non-standing posture — and does so for longer than a set duration — the device’s own orientation frame has drifted relative to the body. As the disclosure puts it, while the patient is actually standing, migration makes the accelerometer read a non-standing posture, and that discrepancy is the tell. The duration threshold in the independent claim is what separates a transient reading from a sustained mismatch consistent with an actual position change.

A system for determining a change in position of an implanted medical device (IMD) within an implant pocket is provided. The system includes an accelerometer configured to be implanted in a patient, the accelerometer configured to obtain accelerometer data along at least one axis. The system also includes one or more processors configured to determine the patient is engaging in a determined activity over an activity period, and obtain the accelerometer data during the activity period. The one or more processors are also configured to identify postures of the patient and corresponding posture periods during the activity period based on the accelerometer data, determine a duration related to a non-standing posture identified from the postures identified, and identify a migration of the IMD within the implant pocket based on the duration of the non-standing posture exceeding a duration threshold.— System for determining change in position of an implanted medical device within an implant pocket, US12672829B2

The dependent claims add quantitative structure. Claim 3 recites a migration threshold example of a 15-degree rotation, giving a concrete angular magnitude for what counts as a shift. The disclosure describes recalibrating a reference standing measurement using x/y/z readings and their standard deviation, and it defines extent-of-right (ETR) and extent-of-supine (ETS) tilt parameters that characterize how the device is oriented. It also describes communicating an alert once migration is detected. Read together, the dependent claims describe establishing a standing reference, measuring tilt against it, and reporting when the orientation departs by more than the threshold.

Where it sits in the same-week Pacesetter cohort

The hero grant sits within a Pacesetter portfolio dense on leadless pacemakers and accelerometer-driven diagnostics. Most directly related is US12629104B2, a system for verifying a pathologic episode using an accelerometer, which uses accelerometer 3D point vectors to verify a candidate arrhythmia episode — the same class of sensor put to a different inferential use. On the device-health theme, US12631690B2 is directed to detecting abnormal battery consumption due to extra-battery mechanisms, an early-battery-depletion detector that, like the hero, turns onboard signals into a maintenance-relevant inference.

The leadless-pacemaker line runs through three grants. US12673211B2, issued the same day as the hero, claims a biostimulator header assembly having an embedded antenna loop. US12667731B2 claims a biostimulator having a flexible circuit assembly built on a folded flex substrate, and US12661501B2 claims a biostimulator having a resilient scaffold carrying the electrode. These issued across late-June and early-July 2026 and describe the physical construction of leadless devices, while the hero and the accelerometer/battery grants describe how such implanted devices monitor themselves.

For the hero record, the factual takeaway is precise. As granted, US12672829B2 claims migration detection built on a single premise: measure posture with an implanted accelerometer during a period the system knows should be standing, and treat a sufficiently long non-standing reading as evidence the device moved within its pocket. The independent claim requires both the standing-activity anchor and the duration-threshold test. It is an issued US patent under CPC A61B 5/686, effective July 7, 2026.