Arthrex, Inc. v. Smith & Nephew, Inc., 935 F.3d 1319

Background

Arthrex’s U.S. Patent No. 8,821,541 claims a biodegradable, fully threaded suture anchor with an integral rigid support (an eyelet shield) and multiple suture openings; independent claims 10 and 11 are at issue.
Smith & Nephew petitioned for inter partes review (IPR), asserting claims 10–11 were unpatentable as obvious over Gordon in view of West, and asserting alternative grounds involving Curtis for claim 10 and anticipation for claim 11.
Gordon discloses a bone anchor with an internal pulley supporting a suture loop but does not expressly disclose the pulley being integral as a single-piece component (a limitation in claim 11).
West discloses anchor posts that may be cast integrally with the anchor body (or alternatively inserted later); petitioner argued West’s casting teaches making the pulley integral as a single-piece component.
The PTAB found claims 10 and 11 unpatentable (Gordon in view of West; Curtis for claim 11/10 grounds), concluding a person of ordinary skill would have been motivated to combine Gordon and West. Arthrex appealed, raising procedural (APA) and substantive challenges and a constitutional challenge to retroactive application of IPR.
The Federal Circuit affirmed: it rejected Arthrex’s APA/procedural challenge to the Board’s wording, found substantial evidence supported motivation to combine, upheld claim construction of “helical thread,” and rejected the retroactivity/constitutional challenge (patent issued post-AIA).

Issues

Issue	Arthrex’s Argument	Smith & Nephew’s Argument	Held
Did the PTAB violate the APA by using different wording (calling West’s casting “preferred”) and thus adopting a new theory to motivate combination?	Board changed petitioner’s theory midstream by characterizing West as showing a “preferred” casting method, depriving Arthrex of notice and opportunity to respond.	Board cited the same West passages relied on by petitioner; difference in wording was minor and parties fully litigated the disputed meaning; no new theory introduced.	No APA violation: Board relied on the same disclosures and theories; wording variation did not create unfair surprise.
Was there substantial evidence of a motivation to combine Gordon and West to render claim 11 obvious?	A POSA would not be motivated to apply West’s casting to Gordon due to manufacturing concerns and differences in disclosures.	West expressly offers casting as an option; evidence and expert testimony support that casting to form an integral support would be an obvious design choice with advantages.	Substantial evidence supports the Board’s finding of motivation to combine; affirm.
Should “helical thread” be construed to require that the thread facilitates rotary insertion into bone?	Yes — Arthrex argued the term implies functionality for rotary insertion and should be so limited.	The claim language and specification treat the helical thread as a structural perimeter-defining feature; not limited to rotary insertion.	Affirmed the Board: “helical thread” means a helical ridge/raised surface that retains the anchor in bone; functional limitation not read into the claim.
Is application of IPR to this patent (or pre-AIA patents generally) unconstitutional as retroactive or violating due process/Article III?	IPR applied to Arthrex’s patent (or pre-AIA patents) is unconstitutional when applied retroactively or raises due process/Article III concerns.	Arthrex’s patent issued after the AIA took effect; IPR applies prospectively here. Even for pre-AIA patents, prior precedent supports IPR’s constitutionality as not creating a retroactive due process problem.	Denied: here patent issued after passage of AIA so no retroactivity; court also cited recent precedent rejecting similar constitutional challenges.

Key Cases Cited

Belden Inc. v. Berk-Tek LLC, 805 F.3d 1064 (Fed. Cir.) (agency must give notice before changing theories in adjudication)
Dell Inc. v. Acceleron, LLC, 818 F.3d 1293 (Fed. Cir.) (IPR proceedings are adjudications subject to APA procedures)
Wi-Fi One, LLC v. Broadcom Corp., 878 F.3d 1364 (Fed. Cir.) (review of statutory and constitutional compliance in PTAB decisions)
KSR Int’l Co. v. Teleflex Inc., 550 U.S. 398 (U.S.) (flexible obviousness analysis; motivation to combine inquiry)
In re Kahn, 441 F.3d 977 (Fed. Cir.) (standard for substantial evidence review of obviousness findings)
Teva Pharm. USA, Inc. v. Sandoz, Inc., 135 S. Ct. 831 (U.S.) (review standards for claim construction and subsidiary factual findings)
Oil States Energy Servs., LLC v. Greene’s Energy Grp., LLC, 138 S. Ct. 1365 (U.S.) (addressing Article III/Patents and recognizing PTAB adjudications)
Eldred v. Ashcroft, 537 U.S. 186 (U.S.) (legal regime governing a patent reflects law at issuance and later changes)
In re NuVasive, Inc., 841 F.3d 966 (Fed. Cir.) (prohibiting Board from relying on new grounds not raised by petitioner)
In re Magnum Oil Tools Int’l, Ltd., 829 F.3d 1364 (Fed. Cir.) (finding APA violation where Board crafted new theory by mixing grounds)
Sirona Dental Sys. GmbH v. Institut Straumann AG, 892 F.3d 1349 (Fed. Cir.) (minor wording differences between petition and Board do not necessarily violate APA)
SAS Inst., Inc. v. ComplementSoft, LLC, 825 F.3d 1341 (Fed. Cir.) (Board may not announce claim constructions that differ significantly from institution decision)