Cardiac transseptal instruments, assemblies, and method of use of the same

Abstract

A needle or stylet has a tip contour with a reverse back bevel curved toward the longitudinal axis of the needle or stylet. The needle has a flexible intermediate portion and/or a two-part construction in which a distal portion of the needle to crimped onto a proximal portion of the needle. The needle or a stylet is combined with a spring mechanism in the hub of the needle or stylet assembly. The spring mechanism positions the tip of the needle or stylet in a middle position extending from the distal end of the assembly, allows the needle or stylet to be moved into a spring loaded fully retracted configuration within the assembly as the septal wall is tented, and then releasing the spring loaded needle or stylet as the needle or stylet penetrates the septal wall. A method of using a needle or stylet with a spring mechanism is included.

Dependencies are inferred from the claim text.