One-time thermoform composite mold for nickel-titanium shape memory alloy patellar concentrator and operation method thereof

Abstract

The invention relates to a compound die assembly of a fixing device for processing the human body skeleton and an operating method thereof. The compound die assembly comprises an upper male die and a lower concave die, the upper male mould comprises a concave module (1) and a press plate (2), wherein, the concave module (1) is matched with the shape of a patella collection device (8), and a vacant groove is arranged between an m claw and an n claw. The lower concave die comprises a concave module (4), a cam (3) and a lever shaft (5), the concave module (4) presents a cuboid, the upper surface is a plane for placing the flat-plate material, the side face of the concave module (4) presents a C character shape, the lever shaft (5) is arranged at the lower part of the concave module (4), the upper male die moves downwards and presses in the lower concave die in the way of two sections, the press plate (2) lies hard upon the cam (3) and drives the rotation of the concave module (4), the flat-plate material is bent and formed on the concave module (1), and a finished product is laterally taken out from the groove of the concave module (1). The invention reduces the numbers of forming and processing, reduces the cost and improves the working efficiency. A blank only is under a linear stress state during the forming process of the patella collection device, the stress state is improved, and the strength, the rigidity and the products quality are improved.

Description

technical field [0001] The invention relates to a mold for processing human bone reinforcing appliances, in particular to a thermoforming mold for a nickel-titanium shape memory alloy patella concentrator and its application method. Background technique [0002] Patella fractures are common in orthopedics. [0003] The principle of treatment for patella fractures is to make the articular surface reset smoothly, the internal fixation firm and reliable, the fracture heal quickly, and the joint activities resume early. Therefore, if there is obvious displacement and uneven articular surface, surgery and internal fixation should be performed. In the past, simple steel wire or Kirschner wire combined fixation, that is, tension band steel wire, was often used. The former had to be supplemented with external fixation with a plaster support, which affected joint function exercises. It causes pain during joint exercise, while the bending strength and ultimate strength of nickel-tit...

AI Technical Summary

Problems solved by technology

Many molding times not only increase the complexity of processing and increase the production cost of the product, but also because the deformation direction is opposite in the two deformation processes at the contact position between three claws and two claws and the bottom plate, there is bidirectional stress, It has a great influence on the strength of the material, which further increases the possibility of cracks and affects the strength and quality of the product, especially the auxiliary bracket used inside the human body. Its quality and service life are directly related to the health and life safety of patients. Therefore, , it is necessary to change its processing and forming methods to improve and improve the quality of the patella concentrator parts

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