A sponsor-investigator owes both jobs' full duties

Most IDE studies split cleanly into two files: a sponsor's, and an investigator's, kept by two different parties who each carry one duty list. This blog has already covered how a study's own risk determination decides whether an IDE application exists at all, but that question assumes the usual structure — a company sponsoring a study that separate clinical sites then run. A single physician who both designs a study and enrolls patients in it under their own direction doesn't fit that structure, and 21 CFR 812.3(o) gives that arrangement its own name: a sponsor-investigator. The definition is short, but the consequence attached to it is easy to underestimate — the regulation doesn't halve the paperwork for holding both roles at once. It doubles it.

A role only a person can hold

21 CFR 812.3(o) defines a sponsor-investigator as an individual who both initiates and actually conducts an investigation — the person under whose immediate direction the investigational device is administered, dispensed, or used. The definition excludes anything other than an individual by its own terms: a company, an institution, or a research group can be a sponsor, and can employ any number of investigators, but none of them can be a sponsor-investigator. A device file that labels a coordinating center or a lead site as the “sponsor-investigator” of a multi-site study has misapplied a term the regulation reserves for one person running their own study alone or with others under their own direction.

Both duty lists, not a merged one

21 CFR 812.40 states the consequence plainly: the obligations of a sponsor-investigator under Part 812 include those of an investigator and those of a sponsor. That's not stylistic emphasis. A conventional investigator's duties — following the investigational plan, obtaining informed consent, maintaining case histories and device accountability records, reporting unanticipated adverse device effects to the sponsor — stay in place for a sponsor-investigator exactly as written. So do a sponsor's duties: submitting the IDE application itself where one is required, selecting qualified investigators and monitoring the investigation, submitting progress and final reports to FDA and to the reviewing IRB, and reporting withdrawn IRB or FDA approval. A sponsor-investigator files both sets, on both schedules, because the regulation never lets the two roles average out into something lighter than either one alone.

Where a solo study quietly drops half its own file

The failure mode this produces is specific: a study run by one clinician reads, from the outside, like “just an investigator's own project,” and the file built around it tracks only investigator-side records — consent forms, case report forms, device logs. The sponsor-side obligations don't disappear because there's no separate sponsor company to assign them to; they land on the same person, on the same clock, alongside everything the investigator side already owes. A clinical investigation plan still has to justify its own design whether one person wrote it wearing both hats or two organizations negotiated it across a table, and an IDE annual progress report is still owed to FDA on the sponsor's schedule even when the sponsor and the person filing the report are the same signature.

The size of the study doesn't change the size of the duty list

Nothing in 812.3(o) or 812.40 scales the sponsor-side duties down for a smaller study. A single-site investigation run by one physician under a significant-risk determination carries the same IDE application, adverse-event reporting, and progress-report obligations a multi-site industry-sponsored trial carries — the sponsor-investigator just happens to be the one person filing all of it. Where a study needs its own investigator's brochure, a sponsor-investigator has to produce that document too, in the sponsor role, even though no separate sponsor organization exists to have written it for them.

Where this meets the file

An IDE tracker built around the sponsor-investigator role has to carry two open duty lists under one name rather than one shortened list — the investigator's recordkeeping and reporting alongside the sponsor's application, monitoring, and reporting duties, both running from the same start date. A worksheet built around 812.3(o)'s definition and the specific duties 812.40 folds together is previewed in the launch catalog. If your program tracks sponsor-investigator studies differently, the shelf takes that correction directly.