Percutaneous access device with adjustable depth stop

A percutaneous nephrolithotomy (PCNL) access assembly, comprising:

• an access needle comprising:
• a cannula including a hub and a shaft extending from the hub;
• a depth guide disposed on an outer surface of the cannula shaft in order to provide an indication of insertion depth;
• a stylet including a tapered point at a distal end of the stylet and a stylet hub coupled to a proximal end of the stylet, the stylet hub configured to be releasably securable to the cannula hub with the stylet extending through the cannula;
• and
• an adjustable slider releasably securable to the cannula shaft at a desired position relative to the depth guide, the adjustable slider capable of an adjustment configuration in which the adjustable slider is moveable relative to the cannula shaft and a secured configuration in which the adjustable slider is secured relative to the cannula shaft.

A percutaneous nephrolithotomy (PCNL) needle, comprising:

• a cannula including a shaft defining a cannula lumen extending through the shaft and a cannula hub coupled to a proximal end of the cannula;
• a depth guide disposed on an outer surface of the cannula shaft, the depth guide configured to provide an indication of insertion depth;
• a stylet disposable within the cannula lumen, the stylet including a tapered point at a distal end of the stylet and a stylet hub coupled to a proximal end of the stylet, the stylet hub configured to be threadedly engageable with the cannula hub;
• a first alignment marker disposed on the cannula hub and a second alignment marker disposed on the stylet hub, the first alignment marker and the second alignment marker positioned to provide a visual indication when the stylet hub is aligned with the cannula hub;
• and
• an adjustable depth stop releasably securable to the cannula shaft at a desired position relative to the depth guide, the adjustable depth guide capable of being manipulated between an adjustment configuration in which the adjustable depth guide is moveable relative to the cannula shaft and a secured configuration in which the adjustable depth guide is secured relative to the cannula shaft.