The assignee ranking covers 28 companies built from 67 published records, and it is concentrated rather than evenly spread: the top 5 assignees combined hold 55.2% of all records, and the top 10 hold 85.1%. The single leading assignee holds 11 records, well ahead of fifth place at 4. This means a small number of established medical device and navigation companies have shaped most of the claim space, while the remainder of the ranking consists of companies with only a handful of filings each.

Filing activity peaked in 2021 at 10 records and had fallen to 2 records by 2024, an -80% change over that three-year window. However, because patent publication typically lags actual filing by around 18 months, the 2025 and 2026 figures in any dataset are necessarily incomplete and should not be read as proof the field is cooling further. The safest read is that the field passed a filing peak around 2021 and has settled to a lower but still active rate through the last complete year of data.

The overwhelming majority — 95.5% of the 67 records — carry the A61B classification for diagnosis and surgery, confirming this is fundamentally a surgical-instrumentation field. Secondary clusters appear around healthcare informatics (G16H, 14.9%), image data processing (G06T, 11.9%) and pictorial communication or video (H04N, 10.4%), reflecting the role of image-guided registration. Robotics-specific manipulator claims (B25J) and implant-integration claims (A61F) each appear in only 6.0% of records, which is comparatively thin given how central robotic manipulation is to commercial systems.