Cannulated Screws 3.5mm, 4mm, 4.5mm, 6.5mm, 7mm, 7.3mm

Cannulated screws are used in bone and joint surgery to repair breaks and to secure artificial implants which may be used to replace part or all of a joint.

The main advantage of cannulated screws is that they can be inserted over a guide wire or guide pin. The diameter of the guide pin is much smaller than the cannulated screw and can be more accurately placed using fluoroscopy in the operating room. In addition, given its small diameter, the guide pin can be reinserted several times if necessary for accurate placement without excessive damage to bone.

3.5 mm Cannulated Screw

4 mm Locking Cannulated Screw

4 mm Cannulated Screw

4.5 mm Cannulated Screw

5 mm Locking Cannulated Screw

6.5 mm Locking Cannulated Screw

6.5 mm Cannulated Screw

7 mm Cannulated Screw

7.3 mm Locking Cannulated Screw

7.3 mm Cannulated Screw

Cannulated screws Specification

Thread on the full Cannulated screws extends into the head profile. Greater gripping ability, especially with osteoporotic bone, allowing for easy removal.

Low-profile head reduces possibility of soft tissue irritation.

Hemispherical head ensures optimal annular contact with washers or plates when screws are angled.

Cancellous thread profile uses deep cutting threads with a large pitch to increase resistance to pullout. Large pitch also accelerates screw insertion and removal.

Self-tapping screw tip facilitates screw insertion. Reduces the need for pre-drilling and tapping.

Reverse cutting flutes for easy removal.

Cannulated screws Sizes

Cannulated screw is generally made of stainless steel or titanium and is self-tapping, which means it can cut its own path through bone as it is screwed into place. Cannulated screws are available in many different sizes such as:

3.5 mm Cannulated

4 mm Locking Cannulated

4 mm Cannulated

4.5 mm Cannulated

5 mm Locking Cannulated

6.5 mm Locking Cannulated

6.5 mm Cannulated

7 mm Cannulated

7.3 mm Locking Cannulated

7.3 mm Cannulated

Cannulated screws Uses

Cannulated Screws are intended for fixation of fractures, fusions, and osteotomies of Small and large bones appropriate for the size of the device.

Cannulated screw have a hollow central shaft. Both cortical and cancellous screws can be cannulated. Cannulated cancellous screws are used for metaphyseal fractures while cannulated and noncannulated cortical screws are used as lag screws for fixation of diaphyseal fractures.

Partially threaded screws may be used to lag one bone fragment to another, where the bone fragment is captured by the threads of the screw and pulled toward the near cortex fragment on the head side of the screw. Fully threaded screws are intended to be used to stabilize fractures with little to no compression across the fracture.

Cannulated screw system provide emergency closed reduction, percutaneous screw fixation and excellent stability.

Cannulated bone screws in comparation with traditional screws decrease surgical time, allow more precise screw placement and reduce possibility of errors.

One special type of cannulated cancellous screw is the Knowles pin which is a Cannulated screws used for fixation of slipped capital femoral epiphysis in children.

Cannulated screws Surgical Technique

Cannulated screw with threads suitable for porous bone are more common, and they are larger in diameter, with bigger spaces between the threads and a relatively narrow inner shaft. Since they are intended to fix softer bone, their design provides a larger surface area for the bone to grip

Cannulated screw enable the performance of what are called percutaneous techniques, where a surgical procedure takes place through puncture holes in the skin rather than making a large open incision. This type of surgery may be used to treat a femoral neck fracture, where the ball-shaped head of the thigh bone breaks off at the narrow point, or neck, where it joins to the shaft. The operation can only be used in cases where the broken bone is still in place, to ensure that the head of the thigh bone has not had its blood supply disrupted and will remain alive after the screws have secured it in place.