A U.S. appeals court on Tuesday lifted a preliminary injunction on Boston Scientific's (Natick, Massachusetts) catheter product Guidezilla that had been issued by a lower court as part of a patent fight with Vascular Solutions (Minneapolis).

The U.S. Court of Appeals for the Federal Circuit, which specializes in patent appeals, said, "There are too many unresolved issues at this stage of the case" to warrant the grant of a preliminary injunction.

Vascular Solutions filed a lawsuit against Boston Scientific in May 2013, accusing it of infringing on three patents in making its Guidezilla catheter. That case is being heard in the U.S. District Court for the District of Minnesota, and is scheduled to be ready for trial before or after March 2015.

Vascular claimed that Boston Scientific's product was a copy of its own Guideliner catheter, which allowed hard-to-reach arteries to be treated.

Vascular Solutions developed its GuideLiner catheter implant in 2009, well before Boston Scientific created Guidezilla. Vascular claims that former employee Sam Rasmussen, a senior product manager, took a similar position at Boston Scientific and helped market the Guidezilla catheter.

The case is at the U.S. Court of Appeals for the Federal Circuit. It is Vascular Solutions, Inc v. Boston Scientific Corporation and is No. 2014-1185.