Gear type intramedullary needle extractor physical picture 2 use method Under the anesthesia, the patient exposes the top end of the femoral greater trochanter and the intramedullary needle tail hole. The surgeon holds the handle of the extractor and presses the fulcrum fixed cap on the top of the greater trochanter. The side is inserted into the soft tissue inside the greater trochanter, and the hook is hooked into the intramedullary needle tail hole, that is, the wrench is turned, the gear is rotated, and the intramedullary needle hooked by the rack and the hook is gradually lifted until the intramedullary needle is inserted. All taken. The double-wing pressure plate is also embedded in the lower end of the column, the two wings of the pressure plate are pressed on the upper end of the intramedullary expanded self-locking needle, the screw for fixing the pressure plate is tightened, and the ring screw is screwed into the upper end of the inner needle of the intramedullary expanded self-locking needle. Inside the mouth, hook the hook to the ring, that is, shake the wrench to pull the inner needle. After the inner needle is removed, remove the double-wing pressure plate, screw the ring nut onto the wire end of the upper nail, hook the hook on the ring of the nut, and shake The turning wrench and the outer nail are easily taken out along with the lifting of the rack, and the whole process of extracting the self-locking needle in the intramedullary expansion is completed. The extractor has reasonable design, simple structure, novel and unique shape, and its fulcrum is on the large trochanter. Therefore, the fulcrum and the traction point are in parallel and opposite force, no component force is formed, and mechanical traction is adopted, so the pulling force is extremely balanced and stable. When the difficulty of extraction or the intramedullary nail is bent to some extent, the extractor can be easily extracted. We extracted the maximum curvature of the plum-shaped marrow to 18b.
The extractor is simple in operation, easy to grasp, short in operation, less in trauma, less painful, and is suitable for the extraction of intramedullary needles of various types (V-shaped, plum-shaped, interlocking intramedullary nail, intramedullary expanded self-locking needle). The retaining cap of the extractor has a hemispherical concave shape, which is advantageously fixed to the top end of the greater trochanter. The opposite side of the rack has a deep serrated structure, which is beneficial to penetrate into the soft tissue inside the top end of the greater trochanter, and the arc sides of the fixed cap are curved to avoid For the compression injury of the soft tissue on the front and rear sides of the greater trochanter, we did not encounter cases in which the large trochanter was crushed. There is no impact injury to the femoral neck, acetabulum and soft tissue, which is quite different from the current extractor. The rotation of the gear causes the rack to be lifted, and the hook and the intramedullary needle are formed without a torque, and no external resistance is generated, so that the labor is extremely labor-saving, and the wrench can be folded into 90b, which is more favorable for shaking.
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Plastic mold casting systems can be divided into three categories according to different types of molds:
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(3) Hot runner mold, the mold is the same structure and fine nozzle, the biggest difference is that one or more heat flow, temperature and hot pumping nozzle, but not cold feeding and demoulding, the runner and gate are directly on the product, So the port does not need demoulding, also known as pouring system, this system can save raw materials, suitable for products with expensive raw materials, high demand, difficult mold design and processing, and high cost. The heat flow channel system, also known as the heat flow channel system, is mainly composed of a heat flow channel cover, a heat flow channel plate and a temperature control electrical box. There are two commonly used heat flow channel systems: single-point heat flow channels and multi-point heat flow channels. Using a single-point thermal gate, the molten plastic is injected directly into the cavity with a single thermal gate sleeve. Multi-point hot sprue is used to branch molten material into each hot sprue sleeve and then through the hot sprue plate into the mold cavity
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