Cement-Augmented Spinal (Polyaxial) Pedicle Screw

Kangli Orthopaedics manufactures this cement-augmented spinal polyaxial pedicle screw for posterior spinal instrumentation and fusion constructs that incorporate a bone cement delivery pathway. The screw is machined from titanium alloy and combines a U-shaped multiaxial break-off head, a tapered threaded shaft with multiple side apertures, and an internal channel that carries cement into the shaft. Together these features support screw placement, cement passage out along the shaft, and connection to the remaining rod and connector hardware.

Bone Cement Delivery Through Side Apertures

Multiple apertures extend through the threaded shaft and open along the screw body. Cement introduced through the internal channel leaves through these openings, so the material is released along the length of the shaft rather than only at the distal tip.

Shallow Index Hole as a System Mark

A shallow blind hole is machined into the implant as the system mark hole. It identifies which screw system the implant belongs to, so the system can be read from the implant itself.

Tapered Threaded Shaft for Pedicle Fixation

The shaft carries continuous helical threading along its tapered length, running out to the pointed distal tip. The thread runs the full length rather than stopping short, so the threaded profile stays consistent as the screw advances along the prepared pedicle pathway. The screw is supplied across a range of shaft lengths, with the shaft narrowing toward a pointed leading end instead of a blunt terminal face.

Polyaxial Break-Off Head for Construct Assembly

The U-shaped receiving head allows angular movement between the shaft and the connection point for the fixation assembly, so rods and connectors can be seated without the screw axis fixing the alignment. Once the screw is seated and the assembly is complete, the break-off portion of the head separates, leaving a defined final profile.

Diameters and Colour Marking

The screws are supplied across four diameters, and each diameter carries a colour marking. The marking separates the two smaller diameters from each other and from the larger pair; it does not separate the two largest, which share a colour and are told apart by their marked diameter.

Applications

• Posterior spinal instrumentation and fusion constructs incorporating bone cement
• Pedicle screw placement with cement delivery through shaft apertures
• Polyaxial alignment during spinal rod or connector assembly
• Break-off head separation after the screw is seated
• Matching an implant to its system by the machined mark hole

This screw complements the Low-profile Spinal (Polyaxial) Pedicle Screw in product selections where cement delivery through the shaft is required instead of a short-tail screw profile, and sits alongside the Minimally Invasive Spinal (Polyaxial) Pedicle Screw in the same posterior fixation range.