As we’ve mentioned before, the supposed “parallel violation claim” exception to medical device preemption has been frustratingly vague. That’s because it originated in a complaint’s vague language that Medtronic, Inc. v. Lohr, 518 U.S. 470 (1996) – decided on a motion to dismiss – speculated might have stated such a claim. A single paragraph of dictum in Riegel v. Medtronic, Inc., 552 U.S. 312, 330 (2008), seemingly recognizing the exception in the course of explaining that the plaintiffs had waived it, only made things worse.

A new case, Walker v. Medtronic, Inc., No. 10-2219, 2012 WL 206036, slip op. (4th Cir. Jan. 25, 2012), is the first court of appeals case that really takes a close look at what “parallel” claims entail post-Riegel. While we’d prefer that this phantom exception not exist at all, the court’s discussion keeps it tightly constrained and thus gets a thumbs up from us. Perhaps it was fitting that Walker was decided on Bexis’ birthday.