During percutaneous renal access, the needle tip must pass through the skin, muscle, and renal parenchyma to precisely reach the targeted calyx. Although it may appear to be a simple act of “puncturing,” the procedure involves two key challenges: advancing smoothly through tissue while maintaining the intended needle trajectory toward the target.

A 2016 study published in the Journal of Endourology investigated needle insertion forces during percutaneous renal access. Using fresh human cadaveric tissue, the study measured the forces generated as the needle passed through different tissue layers, demonstrating the measurable tissue resistance and mechanical forces encountered during renal puncture.

For urologists, however, the challenge extends beyond simply “getting the needle in.”

When the Tip Deviates, So Can the Access Tract

A 2022 review published in BJU International focusing on PCNL puncture noted that conventional beveled needles may experience tip deflection during advancement. Because the beveled tip is subject to lateral forces from the surrounding tissue, the bevel can act like a “rudder,” potentially causing the needle tip to deviate from its intended trajectory. In comparison, symmetrical tip geometries may reduce this tendency to deflect.

This means that needle tip design influences not only insertion resistance, but also the stability of the puncture trajectory.

An ideal puncture needle therefore needs to balance tissue cutting, insertion resistance, and trajectory control.

Three Facets: Changing How the Tip Interacts with Tissue

A three-facet bevel tip uses a primary bevel together with two lateral bevels to form the cutting structure at the distal tip, creating defined cutting edges where the needle meets the tissue.

Previous studies of renal puncture needles have shown that tip geometry can influence puncture performance across different layers of renal tissue, highlighting the importance of considering needle tip design in relation to the mechanical properties of renal tissue.

Therefore, the value of a three-facet design is not simply to make the tip “sharper.” Rather, it optimizes the tip geometry to establish a more controlled cutting and force distribution pattern during tissue penetration, supporting smooth puncture and controlled advancement.

Neimor AimPath™ Puncture Needle: From Tip Design to Precise Control

Designed around the needs of urological puncture procedures—including smooth penetration, tip visualization, and depth control—the Neimor AimPath™ Puncture Needle incorporates targeted design features from the needle tip through the shaft:

Three-Facet Bevel Tip
Sharp three-facet bevel design optimizes tip cutting geometry to support smooth puncture and reduce tissue resistance.

Tapered Smooth Transition
A tapered, smooth transition at the distal shaft creates a continuous profile from the tip to the shaft, supporting smooth advancement.

Distal Laser-Marked Pattern
A distal laser-marked pattern enhances tip visualization under imaging guidance for easier identification of needle tip position.

Laser-Engraved Depth Markings
Clear laser-engraved depth markings provide an intuitive reference for monitoring insertion depth and supporting precise positioning.

Making Every Puncture Smoother and More Controlled

From tip cutting to shaft advancement, and from tip visualization to depth assessment, every detail of a puncture needle can influence procedural control.

Neimor AimPath™ Puncture Needle applies precision engineering to clinical needs, supporting smoother, more precise, and more controlled puncture.