3D-printed manual vertebral body interior fixing device

Abstract

The invention relates to a vertebral column stabilizer and particularly relates to a 3D-printed artificial vertebral body interior fixing device. The 3D-printed artificial vertebral body interior fixing device comprises a prolongable member and 3D-printed members located at the two ends of the prolongable member, wherein the prolongable member comprises an outer sleeve and supporting platforms which are separately located at the two ends of the outer sleeve, and the 3D-printed members are located at outer sides of the supporting platforms and are fixedly connected with the supporting platforms; a sleeve wall of the outer sleeve comprises a sleeve outer wall and a sleeve inner wall, the sleeve outer wall is polygonal, the sleeve inner wall is provided with a thread, and a plurality of long-strip holes are uniformly formed in the sleeve wall of the outer sleeve in a spaced manner and are formed symmetrically relative to the axis of the outer sleeve. According to the device, 3D-printed member modules and non-3D-printed member modules are assembled, a simple prolongable mode with stable mechanics is developed, both 3D-printed parts and non-3D-printed parts have different models, and the different models can be modularly assembled, so that the saving of printing materials is facilitated, the printing time is shortened, the flexibility of operating is improved, a slit of a artificialvertebral body and a bone interface is reduced, fusion is promoted, and the forward stability is facilitated.

Description

technical field [0001] The invention relates to a spinal stabilizer, in particular to a 3D printing artificial vertebral internal fixation device. Background technique [0002] Spinal vertebral tumors, fractures, infections and other lesions are difficult points in the treatment of spinal surgery. The treatment level of the above diseases is an important reflection of the level of spinal surgery in each medical unit. In recent years, with the significant improvement in the level of spine surgery in my country, the treatment of spinal vertebral tumors, fractures, infections and other lesions has also achieved rapid development. At the same time, the improvement of clinical level has also promoted the development of scientific research innovation, especially with the application and development of 3D printing technology in various fields, it has provided new ideas and possibilities for the treatment of traditional diseases. [0003] Surgical treatment of spinal vertebral tumo...

AI Technical Summary

Problems solved by technology

[0004] With the development of spinal vertebral body reconstruction and fusion technology, more and more biomechanical tests and clinical applications show that the existing artificial vertebral bodies still have the following defects in treatment: (1) metal artificial vertebral bodies and upper and lower vertebral bodies Reliable fusion cannot be formed between bones, and the interface gap between metal and bone cannot be eliminated, resulting in implant prolapse, settlement, loosening, etc., and poor long-term stability; (2) Poor matching, due to individual differences in different patients' diseases and bones (such as differences in tumor size and bone length), resulting in differences in the size of the parts that need to be reconstructed after bone resection, requiring individualized artificial vertebral bodies, but the existing artificial vertebral bodies cannot meet individual differences, and artificial vertebral bodies often occur during surgery. If the vertebral body does not meet the needs of the patient, it will affect the surgical effect; (3) The length of the existing artificial vertebral body is uncontrollable, and it cannot take into account the convenience of placement and the close contact with the interface. If the artificial vertebral body is the same size as the space left after the lesion is removed, Although the interface between the bone and the artificial vertebral body is in close contact, it is inconvenient to place; if the artificial vertebral body is smaller than the space left after the resection of the lesion, although it is convenient to place, the interface between the bone and the artificial vertebral body is in close contact and there will be gaps; if the artificial vertebral body If it is slightly larger than the space left after lesion resection, it will facilitate close contact with the interface after placement, but it is difficult to put in; (4) If it cannot be properly stretched during the operation, it will not be possible to make the bone and the artificial vertebral body in close contact

[0005] Some scholars are aware of the above problems and have actively explored, such as extending the artificial vertebral body to realize the controllable length of the vertebral body, but most of them have the disadvantages of complex extension mechanism, low mechanical strength, and poor stability. The vertebral body can ensure close contact with the bone interface, but the metal-bone interface has poor compatibility, cannot form reliable fusion, and has poor long-term stability

[0006] Some scholars consider 3D printing trabecular vertebral bodies to promote the ingrowth of trabecular bone, which can achieve long-term bony fusion, but the current technical solution needs to be temporarily designed and printed according to the length of the patient's bone, which takes a long time and the patient's operation time is long. It takes a long time to wait before, and once the printing is completed, the size is fixed and cannot be adjusted during the operation. Once the tumor resection range exceeds the expected range during the operation, the artificial vertebra will not match the patient; at the same time, the current 3D printed trabecular bone vertebra The body cannot be stretched and pressurized to both sides, making it difficult to put in and the interface with the bone is not tightly contacted, which affects the fusion

[0007] To sum up, the existing artificial vertebral bodies cannot realize the differentiated manufacturing of 3D printing and non-printing modularization, cannot realize the organic integration of 3D printing customization and flexible intraoperative extension adjustment, and cannot achieve the organic integration of individualized and standardized manufacturing. Product registration, specification delineation, and individualized use of plants bring difficulties, resulting in waste of materials, long printing time, and loss of intraoperative flexibility.

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