Medical cranium nail structure

Abstract

The invention discloses a medical cranium nail structure. The cranium nail structure includes first threads with first front surfaces, first rear surfaces and crests, second threads which include second front surfaces and second rear surfaces are formed on at least part of the crests of the first threads, the shapes of sections, in the cross section of the axis of a bolt, of at least part of the second threads are changeable, the mode of change includes gradual change, sudden change and the combination of the gradual change and the sudden change, the first threads include conical thread root diameters, and the thread pitches of the second threads are changeable; a penetrating-through cavity is formed in the middle of a cranium nail, the upper end portion of the cavity is provided with a hexagonal groove segment, the bottom of the hexagonal groove segment and the bottom of the cavity are both provided with plugs, and the cranium nail is prepared by the adoption of a medical polyether-ether-ketone macromolecular material. The medical cranium nail structure is simple in structure and convenient to use; by the adoption of the medical cranium nail structure and a preparation method thereof, surgical effects are good, standardized convenient preparation can be achieved, and the effect on a cranium defect repair is good.

Description

technical field [0001] The invention relates to the technical field of re-repairing human skull defects, in particular to a medical skull nail structure. Background technique [0002] Cranial surgery, such as skull defect, repair and plastic surgery, cranioplasty is an effective method for the treatment of skull defect, a material (artificial material or autologous bone) is used in the operation to repair the defective skull. [0003] Currently, the commonly used skull repair materials are titanium mesh, or sheets made of materials such as plexiglass or silicone rubber. During the operation, it is cut according to the size of the skull defect and placed in the defect, and the surrounding holes are fixed with silk thread or metal materials. A prominent problem of this type of skull mesh is that its strength is poor, which is not conducive to the protection of the skull defect. For example, the skull mesh plate provided by the patent application number 201120482438.X, the ti...

AI Technical Summary

Problems solved by technology

However, such an approach can adversely affect other aspects of the mechanical properties of the cranial screw

[0007] For example, in terms of the bending strength of the screw, the increase in the height of the thread profile will make the inner diameter of the thread relatively smaller, so that the cross-sectional area of ​​the screw that can withstand the bending stress is reduced, and the bending strength is significantly reduced.

Especially when the thread density is high, it is easy to form a sharp corner at the bottom of the tooth, which leads to stress concentration and further reduces the bending strength of the screw

Moreover, the height of the tooth form is too high and the axial dimension of the tooth form is too small, which will cause the fracture of the thread teeth

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