SCREW for osteosynthesis of pelvic bones

摘要

The invention relates to medical engineering, in particular to devices used in minimally invasive osteosynthesis Traumatology with pelvic fractures. The surgical treatment of fractures of the pelvic ring perform closed reduction and percutaneous osteosynthesis of pelvic bones. As metallofiksatorov using cannulated screws "Synthes" AO 7,3 mm. (Cannulated Screws ⌀7.3 mm, thread length 16 + 32 mm, Titanium Alloy (TAN), SYNTHEZ eCatalog 01.201.814. Metallofiksatory However, these have disadvantages, namely, for pre-screw must zasverlivat needle guide and cannulated drill over it to form a channel . due to the large diameter of the screw often perforates the bone, leaving behind kortikal or into the joint cavity. There are difficulties in removing. This cannulated screw is taken as a prototype. The aim of CITO screw is to reduce the diameter of the screw that allows the 2 screws from the same skin incision in 1 m., in either direction for more stable fixation without preforming channel. The technical result of the present utility model is the lack of need for a channel formation for holding the screw, which reduces the trauma surgery. It becomes possible to remove the screw. Due to the screw diameter of 3 mm. appear possibility of two screws of one skin incision of 1 cm., in any direction for a more stable osteosynthesis. Improves the accuracy of the installation screws at the expense of a collet guide. To achieve said technical result proposed TSITO screw has an original design. It consists of a rod with a diameter of 3.0 mm. (Grade titanium alloy BT-6) with a partially threaded length of 2.5 cm., And at the end a triangular tip. On the other side there is a thickening of the figure with a hexagonal groove 4.5 mm. Form figure thickening due to the fact that it is inserted into the collet guide to more accurately carrying screw in the required direction. CITO Fixing screws occurs under the action of the axial force applied to the handle of a collet guide the direction of the screw. Length TSITO screw varies depending on the type of fracture - from 5 cm to 17 cm (Fig 1).... The claimed subject eliminates the drawbacks of the prototype and significantly facilitates the work in surgical interventions:; 1. There is no need for a channel formation for the screw.; 2. Reduced trauma surgery.; 3. There is a possibility of 2 screws of one skin incision of 1 cm., In any direction for a more stable osteosynthesis.; 4. Increased the accuracy of the installation of the screw due to the collet guide.