Abstract: A transseptal crossing needle has an elongate, flexible tubular body, having a proximal end, a distal end and an electrically conductive sidewall defining a central lumen. The distal end has a radially inwardly extending annular recess. The tubular body has a first outside diameter proximally of the annular recess and a second, smaller outside diameter in the recess. An electrode tip has a proximally extending connector residing within the annular recess, and the electrode tip has a third outside diameter distally of the connector, which is greater than the first diameter. An insulation layer encloses the sidewall and the connector, and has an outside diameter approximately the same as the third diameter to provide a uniform outside diameter throughout a distal zone of the needle.

Abstract: A self-contained, battery powered transseptal crossing system is disclosed. An elongate, flexible electrically conductive needle body has a proximal end and a distal end. An insulation layer surrounds the sidewall and leaves exposed a distal electrode tip. A generator is configured to deliver RF energy to the electrode tip, and includes a processor configured to take impedance measurements at the tip to confirm contact with the intra atrial septum and/or confirm entry into the left atrium.

Abstract: A self-contained, battery powered transseptal crossing system is disclosed. An elongate, flexible electrically conductive needle body has a proximal end and a distal end. An insulation layer surrounds the sidewall and leaves exposed a distal electrode tip. A generator is configured to deliver RF energy to the electrode tip, and includes a processor configured to take impedance measurements at the tip to confirm contact with the intra atrial septum and/or confirm entry into the left atrium.