4mm Cannulated Cancellous Screw Instruments Set

      Features:

1. Cannulated Design: These screws have a hollow center, allowing them to be placed over a guide wire during surgery, which facilitates accurate placement.
   
   
2. Self-Tapping: Many cancellous screws are self-tapping, meaning they can cut their own thread as they are inserted into the bone, reducing the need for pre-drilling.
   
   
3. Variable Lengths: Available in various lengths to accommodate different bone sizes and fracture patterns.
   
   
4. Hexagonal Head: The head of the screw is often hexagonal, allowing for easy tightening using a corresponding screwdriver or wrench.
   
   
5. Titanium Construction: They are often made of titanium, which is biocompatible and lightweight.

      Uses:

1. Fracture Fixation: Cancellous screws are commonly used to stabilize fractures in cancellous bone, such as those in the hip, ankle, or wrist.
   
   
2. Bone Graft Fixation: They may also be used in bone grafting procedures to secure bone grafts in place as they heal.
   
   
3. Osteotomy: Cancellous screws can be used in osteotomy procedures to realign or stabilize bones that have been intentionally cut to correct deformities.
   
   
4. Arthrodesis: They are used in arthrodesis procedures, where two bones are fused together to eliminate motion in a joint, such as in the ankle or wrist.

       FAQs:

1. How are cannulated cancellous screws inserted?
• Typically, a guide wire is first inserted into the bone, followed by the cannulated screw, which is threaded over the guide wire. The screw is then advanced into the bone until it is properly positioned.
  
  
2. What are the advantages of using cannulated screws?
• Cannulated screws allow for minimally invasive surgery since they can be inserted over a guide wire, reducing tissue damage. They also provide accurate placement and strong fixation.
  
  
3. Can cannulated cancellous screws be removed?
• Yes, if necessary, cannulated cancellous screws can be removed through a similar minimally invasive procedure. However, the decision to remove a screw depends on factors such as the patient's condition, bone healing, and the presence of any complications.
  
  
4. What are the potential complications associated with cancellous screw fixation?
• Complications can include infection, screw loosening or breakage, damage to surrounding tissues or nerves, and delayed or non-union of the fracture.
  
  
5. How long does it take for a bone to heal after fixation with cancellous screws?
• The healing time varies depending on factors such as the location and severity of the fracture, the patient's overall health, and the stability provided by the screws. In general, it can take several weeks to several months for a bone to fully heal.
  
  

  Instrument	Description
  Cannulated Screwdriver	For insertion of the 4mm cancellous screws.
  Cannulated Tap	Creates threads in the bone to accommodate the screw.
  Depth Gauge	Ensures accurate screw placement by measuring depth.
  Cannulated Drill Bit	Creates a pilot hole for the screw, allowing precise placement.
  Guide Wire	Guides the drill and screw into the bone.
  Screw Extractor	Removes screws if necessary.
  Countersink	Creates a recess for the screw head to prevent irritation.
  Screw Holder	Holds the screw securely during insertion.
  T-Handle Wrench	Tightens and secures the screw in place.
  Sterilization Case	Holds and sterilizes the instruments for surgical use.