A device designed to puncture the interatrial septum during a transseptal catheterization procedure to gain left heart access typically to facilitate fluid aspiration and injection/infusion, blood sampling, and pressure monitoring. It is typically a long, thin stainless steel tube that is curved and pointed at the distal end, usually having a hub with a stopcock and orientation indicators at the proximal end. It may include a stylet for support during handling. This is a previously used single-use device that has been processed for an additional single-use patient application.