The leading assignee in this dataset holds 209 of the 2,023 records in scope, well ahead of the fifth-ranked assignee at 87 and the tenth at 40. That gradient — a strong leader followed by a steep drop-off rather than a tight cluster — means one company's filing history dominates the historical record even though the top five combined only reach 30.8% of all records. Recent-year momentum data also shows several of these historical leaders have slowed to zero filings in the latest year, so current activity does not track the same ranking as cumulative volume.

Filing peaked at 125 records in 2019 and has since declined; the period from 2021 to 2024 shows a 31% drop, from 88 records down to 61. That said, 2025 and 2026 figures in any dataset like this are always incomplete because publication typically lags actual filing by around 18 months, so the most recent one to two years will look artificially low regardless of true filing activity. The safest read is that the field cooled from its 2019 peak through at least 2024, without over-reading the very latest bars.

US8182490B2 claims an adjustable angle targeting device for an intramedullary nail, filed by Biomet C.V. and published in 2012. Its core mechanism ties a rotational alignment member and a bore with a slot-shaped upper portion to a spherical-surfaced holding member, letting the targeting frame adjust angle while keeping the nail aligned during interlocking screw placement. Anyone designing a targeting jig or guide frame for nail insertion needs to check their bore and alignment-member geometry against this claim structure specifically, not just against the general concept of an angle-adjustable guide.

IPC composition shows heavy concentration in A61B surgical procedure claims (88.4% of records) and comparatively thin coverage in areas like dynamization timing control, rotational alignment sensing without fluoroscopy, and predictive imaging for nonunion rate. These branches sit adjacent to dense, well-litigated territory but have not accumulated the same claim density, which typically means more room to file a defensible first claim rather than an already-crowded one. A prior-art search focused specifically on these sub-areas, rather than the field as a whole, is the more useful diligence step before drafting.

Moderately concentrated at the top but with a long tail beneath it: the five leading assignees combine for 623 of the 2,023 records in scope, or 30.8% of the field, and the top ten reach 855 records, or 42.3%. That leaves more than half of all filings spread across a wide base of smaller filers, including specialist implant companies and individual inventor-linked entities. For a new entrant, this means the field is not closed, but the specific claim territory held by the leading handful of assignees — particularly around targeting and interlocking screw mechanisms — is worth mapping before committing to a design direction.