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Extractor of orthopedic slipped screws

A kind of extractor, sliding wire technology

Inactive Publication Date: 2010-10-13
王书军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the screws are subjected to large stresses in the body, they often deform, which greatly increases the frictional resistance of the screws. It is very laborious to unscrew the screws, and the screws often slip. The promotion of LISS system and LCP system are widely used in fracture fixation. There is a fine thread locking between the nail hole of this type of bone plate and the tail of its matching locking screw. During the weight-bearing activities of the affected limb after fracture healing, due The stress of the screw is more likely to cause deformation of the thread between the screw tail and the locking hole on the bone plate, making it more difficult to unscrew the screw, and the probability of screw slippage during strong rotation is greatly increased
"Screw slippage" will significantly increase the difficulty of removal, prolong the operation time, increase the chance of infection, failure of removal and even serious complications such as refracture

Method used

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  • Extractor of orthopedic slipped screws
  • Extractor of orthopedic slipped screws

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Experimental program
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Embodiment Construction

[0015] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0016] The present invention is orthopedic sliding wire screw extractor, such as figure 1 As shown, it is mainly composed of a screwdriver body 1, a main rod sleeve 2, a cone head rod 5 and a flat base 7. The bottom of the main rod sleeve 2 is provided with a spherical body, the top of the main rod sleeve 2 is provided with a notch, the outer surface is provided with external threads, and the inner surface is provided with reverse internal threads. There is a hemispherical ball socket 6 on the base 7, which is used to cooperate with the spherical body of the main rod sleeve 2, which can not only ensure the rotation of the main rod sleeve 2, but also prevent the rotation deviation. A handle ring 8 is also sleeved on the main rod sleeve 2, and a handle 9 is screwed on the handle ring 8. The lower end of the screwdriver body 1 cooperates with the intern...

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Abstract

The invention provides an extractor of orthopedic slipped screws, relating to an orthopedic surgical instrument and mainly comprising a screwdriver body and a main rod sleeve. The extractor of orthopedic slipped screws is characterized in that the lower end of the screwdriver body is arranged in the main rod sleeve, and the upper end of the screwdriver body is a conical hollow cutter head provided with a longitudinal notch; and a propelling ring provided with a conical head rod is installed outside the main rod sleeve, and the upper end of the conical head rod is designed into a conical shape corresponding to the hollow cutter head and extends into the hollow cutter head so that the cutter head is expanded. The invention can be used for extracting screws which have larger resistance and can not be screwed by the traditional screwdriver, especially slipped screws.

Description

technical field [0001] The invention relates to an orthopedic surgical instrument, in particular to an instrument for taking out a fixing screw. Background technique [0002] Bone plate and screw fixation of fractures have become the most commonly used internal fixation methods today. At present, hexagon socket screws are the most commonly used screws in orthopedics. After the fracture has healed, the bone plate screws in the body need to be removed. Because the screws are subjected to large stresses in the body, they often deform, which greatly increases the frictional resistance of the screws. It is very laborious to unscrew the screws, and the screws often slip. The promotion of LISS system and LCP system are widely used in fracture fixation. There is a fine thread locking between the nail hole of this type of bone plate and the tail of its matching locking screw. During the weight-bearing activities of the affected limb after fracture healing, due The stress on the scr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B17/92
Inventor 王书军李桂兰包琴芬唐烨
Owner 王书军
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