Headless cannulated compression screws.
EU MDR
The headless cannulated compression screw system is designed for fixation in the hand and foot. It is used for fracture repair, joint fusion and osteotomy in the carpals, metacarpals, hand phalanges, tarsals, metatarsals and foot phalanges. The screws combine a continuously variable thread pitch with a tapered profile. Being cannulated, they facilitate accurate percutaneous insertion with little soft-tissue dissection. The diameters are colour coded, with matching instruments for each. The screws are titanium and supplied sterile or non-sterile. A second cannulated screw family has its own set.
A continuously variable thread pitch and a tapered profile are intended to improve grip. The screw is tightened until the fracture gap closes and compresses. A deepened tail hexagon is designed to reduce the risk of slipping. An enlarged tail seats the screw level with the bone surface to avoid over-insertion.
The screws are self-tapping and self-drilling, so pre-drilling is unnecessary in most cases. Pre-drilling is recommended in dense bone and in arthrodesis. The axial force needed to insert a self-drilling screw could briefly distract the fragments.
The screws are cannulated and are inserted over a K-wire, a design intended to facilitate accurate percutaneous placement. Soft-tissue dissection is kept to a minimum.
The trailing end of each diameter carries its colour, and the drill sleeve and screwdriver of the same size carry the same colour. Each diameter has its own matching drill, sleeve and screwdriver.
The screws are colour coded and offered in several diameters, each with different distal thread lengths. A compression sleeve and wrench advance the screw so that it compresses without engaging the head thread. A cannulated screwdriver then seats the head in the bone.
Source: Normmed product catalogue.
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