Medical access tools, assemblies, and methods

An assembly for a medical access tool comprising:

• a needle member including a proximal end, a piercing distal tip, and a lumen, the needle member extending along a longitudinal axis of the assembly between the proximal end thereof and the piercing distal tip thereof, the lumen extending from a proximal opening thereof at the proximal end to a distal opening thereof at the distal tip, the proximal end being configured to engage with, and disengage from a connector of a syringe assembly, such that the lumen is in fluid communication with an interior of a barrel of the syringe assembly, when the proximal end is engaged therewith;
• a coiled wire extending around the longitudinal axis of the assembly with an open pitch, the coiled wire including a proximal segment, a distal segment, and a tissue-engaging tip, the coiled wire having an inner surface, the inner surface being spaced radially apart from an outer surface of the needle member along a length of the proximal segment, the distal segment extending distally from the proximal segment to the tissue-engaging tip, the distal tip of the needle member being recessed proximally from the tissue-engaging tip by a distance equal to a length of the distal segment, and the coiled wire having a stiffness that prevents deformation of the pitch thereof during operation of the tool;
• and
• a junction securing the coiled wire to the needle member, the junction being configured to prevent movement of the coiled wire along the longitudinal axis of the assembly relative to the needle member.