MONO AXIAL SCREW (HA COATED)
A monoaxial screw, typically coated with hydroxyapatite (HA), is a medical implant used in orthopedic and spinal surgeries. Here's a breakdown of its specification 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: Monoaxial screws are usually made of medical-grade titanium or titanium alloy due to their biocompatibility and strength. The HA coating provides additional biocompatibility and promotes bone ingrowth.
- Design: These screws have a uniaxial (monoaxial) design, meaning they can be inserted along a single axis or direction. This design feature is crucial for stabilizing spinal segments or fractured bones during surgery.
- Thread: They feature a threaded shaft which provides grip and stability when inserted into bone tissue.
- Coating: The hydroxyapatite (HA) coating enhances osseointegration, which is the process by which bone tissue bonds with the implant. This promotes faster healing and reduces the risk of implant rejection.
- Size: Monoaxial screws come in various lengths and diameters to accommodate different patient anatomies and surgical needs.
- Sterilization: They are sterilized using methods such as gamma irradiation or ethylene oxide to ensure they are free from any microbial contamination prior to surgical use.
Uses
- Spinal Fusion Surgery: Monoaxial screws are commonly used in spinal fusion surgeries to stabilize and fuse vertebral segments. They are inserted into the vertebrae to immobilize them, facilitating the fusion process and alleviating pain caused by spinal instability or deformities.
- Fracture Fixation: These screws can also be used in orthopedic surgeries to stabilize fractures, especially in long bones like the femur or tibia. The HA coating promotes bone healing around the fracture site, aiding in the recovery process.
- Correction of Deformities: Monoaxial screws may be employed in corrective procedures for spinal deformities such as scoliosis or kyphosis. By anchoring to the vertebrae, they assist in realigning the spine to a more anatomically correct position.
- Revision Surgery: In cases where previous spinal instrumentation has failed or requires revision, monoaxial screws can be used to reinforce or replace existing hardware, providing renewed stability to the spine.
- Tumor Resection: During surgeries to remove spinal tumors, monoaxial screws may be utilized to stabilize the spine following tumor resection, helping to maintain spinal alignment and prevent instability post-operatively.
It's crucial for these screws to be used by trained medical professionals following proper surgical techniques and patient-specific considerations.