DUAL THREAD POLY AXIAL SCREW
Dual thread polyaxial screws are specialized orthopedic implants designed for use in spinal fusion surgeries and other orthopedic procedures requiring stabilization and fixation. Here's a breakdown of their specifications and uses:
Size
- Diameters: 4.5mm, 5mm, 5.5mm, 6.5mm and 7.5mm.
- Lengths: 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm and 60mm
Specification
- Material: Dual thread polyaxial screws are typically made of medical-grade titanium or titanium alloy, renowned for their biocompatibility and strength. This material ensures the durability and compatibility of the screw with bone tissue.
- Design: These screws feature a polyaxial design, allowing for multidirectional movement of the screw head relative to the shaft. The dual-thread design incorporates two different thread pitches along the shaft, providing enhanced grip and pull-out resistance.
- Thread: The dual-thread design consists of two different thread pitches on the screw shaft. The proximal portion typically has a finer thread pitch, facilitating easier insertion into bone tissue, while the distal portion features a coarser thread pitch, providing increased pull-out resistance and stability.
- Head: The polyaxial head allows for articulation in multiple directions, enabling surgeons to achieve optimal screw placement and alignment for enhanced stability and fusion success. The head may have a spherical shape to facilitate angulation and accommodate variations in spinal anatomy.
- Coating: Dual thread polyaxial screws may be coated with materials such as hydroxyapatite (HA) to promote osseointegration and enhance bone healing around the implant. The HA coating helps facilitate a strong bond between the screw and surrounding bone tissue, promoting faster fusion and reducing the risk of implant loosening.
- Size: These screws come in various lengths and diameters to accommodate different patient anatomies and surgical requirements.
Uses
- Spinal Fusion Surgery: Dual thread polyaxial screws are commonly used in spinal fusion procedures to stabilize and fuse vertebral segments. The polyaxial design allows for greater flexibility in screw placement and alignment, while the dual-thread design provides enhanced pull-out resistance and stability, promoting successful fusion outcomes.
- Degenerative Spine Conditions: These screws may be utilized in the treatment of degenerative spine conditions such as degenerative disc disease, spinal stenosis, or spondylolisthesis. By stabilizing the affected spinal segments, dual thread polyaxial screws help alleviate pain and restore spinal function.
- Trauma Surgery: Dual thread polyaxial screws can also be employed in the fixation of traumatic fractures, particularly in cases where increased stability and pull-out resistance are required. The dual-thread design enhances fixation strength, reducing the risk of implant failure and promoting optimal fracture healing.
- Revision Surgery: In cases where previous spinal instrumentation requires revision or augmentation, dual thread polyaxial screws may be used to provide additional stability and support. The polyaxial head design allows for easier connection to rods or other spinal implants, while the dual-thread design enhances fixation strength, improving surgical outcomes.
- Pedicle Screw Fixation: These screws are commonly used in pedicle screw fixation systems for posterior spinal stabilization. The polyaxial head design facilitates easier screw placement in the pedicle, while the dual-thread design enhances pull-out resistance and stability, ensuring reliable fixation of the spinal construct.
Uses
Dual thread polyaxial screws are valuable tools in orthopedic surgery, offering versatility, stability, and reliability when used appropriately by trained medical professionals. They play a crucial role in achieving successful spinal fusion outcomes and addressing various spinal pathologies and traumatic injuries.