Intraosseous access device with relieved distal curve for improved support and flexibility

A medical device for accessing and navigating through bone, comprising:

• a curved cannula comprising an elongated tube having a proximal straight portion, a distal curved portion, and a cannula lumen therethrough;
• a stylet comprising an elongated shaft comprising a proximal handle portion, a straight shaft portion, and a distal curved portion;
• wherein the distal curved portion comprises a plurality of ridges extending along an outer curvature;
• wherein the plurality of ridges have filleted edges to facilitate insertion and removal through the curved cannula.

A method for accessing a target location within a vertebral body, comprising:

• inserting an introducer cannula through a pedicle adjacent to the vertebral body;
• advancing a curved cannula assembly through the introducer cannula, wherein the curved cannula assembly comprises a curved cannula and a stylet, wherein the stylet comprises and elongated shaft having a distal curved portion with a plurality of circumferential ridges along an outer radius of the distal curved portion;
• extending the curved cannula assembly beyond a distal end of the introducer cannula to create a curved path within the vertebral body, wherein the plurality of circumferential ridges maintain structural integrity during advancement through varying bone densities;
• removing the stylet from the curved cannula;
• and
• advancing a treatment device through the curved cannula to the target location.