Evolve Medicus is an early-stage medical device company based in The Woodlands, Texas, developing catheter technology. Its published patent application, an Integrated Catheter Assembly co-invented by company president and thoracic surgeon Mark Mettauer, describes a device whose inner and outer lumens let fluid flow into and out of the body through a single injection site. The device is aimed at hemodialysis, where blood is conventionally removed and returned through two separate needle insertions.