Transseptal (TS) procedures for accessing the left side of the heart are an important and rapidly growing space for diagnostics and therapy delivery. Currently, TS procedures are used in the following FDA-approved procedures: atrial fibrillation (AF) ablation, correction of atrial septal defects (ASD), degenerative mitral valve repair and left atrial appendage (LAA) closure. 3DT is developing a guiding catheter for device delivery into the left atrium for accurate and safe placement of steerable guides. Various design features will significantly reduce the propensity for inaccurate punctures and perforations.