Cranial Internal Fixation System -Titanuim Plates and Screws
A Cranial Internal Fixation System is a medical device system used for the stabilization and fixation of cranial bones, typically after trauma, surgery, or congenital deformities.
These systems help in securely holding bone fragments or repositioned skull segments in place to facilitate proper healing.
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1.1 Cranial Internal Fixation System
The implantation of titanium screws in the skull is used for treating skull defects, fractures, or other repair needs. Titanium screws are often chosen for this procedure due to their excellent biocompatibility and strength. The requirements for titanium screws mainly involve material, torque, and design:
1️⃣ Material:
Titanium screws are typically made of medical titanium alloys, such as Ti-6Al-4V, which have high biocompatibility, strength, and corrosion resistance.
Titanium's low density reduces the load on the bone, and it integrates well with bone tissue, minimizing the risk of rejection.
The surface may undergo oxidation treatment or other surface modifications to enhance its bonding with bone tissue.
2️⃣ Torque:
The fixation of titanium screws generally requires precise torque control; too much or too little torque can lead to screw damage or instability.
Typically, the torque is adjusted according to the patient's specific situation and surgical requirements, with excessive tightening being avoided to prevent bone tissue damage.
Appropriate torque ensures that the screw is securely fixed while not interfering with bone healing.
3️⃣ Design:
The design of titanium screws must consider the mechanical load and the anatomical structure. For example, in the relatively thin bone structure of the skull, the shape and size of the screw must precisely match the location of the bone defect.
There are various design options available, such as threaded screws and plate screws. The design should ensure that the titanium screw is securely fixed to the bone while avoiding damage to blood vessels, nerves, and other structures.
The design also needs to take into account the operability of the procedure. The screw's shape, length, and diameter must be selected based on the patient’s anatomical features.
