Bone screw of three-dimensional through porous structure

Abstract

The invention discloses a bone screw of a three-dimensional through porous structure. The porous bone screw comprises a screw head, a screw body and a screw cap. The screw body comprises a porous network composed of the three-dimensional through porous structure. The porous bone screw is made of medical materials which can be implanted into a human body, the three-dimensional through porous structure of the porous bone screw provides more space for the growth of bone cells, the combination between the implanted screw and the bone tissues of the human body is promoted, and the anchoring can be firm.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and relates to a porous bone screw, in particular to a porous bone screw with a three-dimensional through-hole structure. The porous bone screw can be applied to the repair of clinical bone tissue damage. Background technique [0002] As aging becomes more and more serious, more and more people develop osteoporosis (OP), which is characterized by decreased bone mass, degeneration of bone microstructure, increased bone fragility, and susceptibility to fracture after reaching middle-aged and elderly people. According to statistics, there are about 200 million people in the world suffering from osteoporosis, and its incidence rate has jumped to the seventh place among common diseases in the world. It is one of the most common diseases among middle-aged and elderly people. my country has the largest number of osteoporosis patients in the world The country, the International Osteoporosis Founda...

AI Technical Summary

Problems solved by technology

Osteoporosis patients are prone to fractures, which are common in the spine, hip joints and limbs, etc., and due to the insufficient holding force of the screws on the bone, osteoporosis patients often have screw loosening, screw withdrawal and the resulting secondary surgery after surgery. It brings huge physical and mental distress to both doctors and patients, and its high treatment costs also bring heavy economic burdens to patients and society

[0003] At present, the methods to improve the stability of the screw-bone interface mainly include: (1) Bone cement strengthening technology, such as using polymethyl methacrylate (PMMA) bone cement material to strengthen the screw track, but this method is prone to bone cement solidification. Exothermic heat causes damage to surrounding bone and nerve tissue, and PMMA material has poor biocompatibility, hinders bone tissue from growing into the material, and the interface is not strong; and bone cement leakage can easily cause serious complications in the nerve, respiratory and cardiovascular systems; at the same time, This type of technology has high requirements for doctors to operate. Once the bone cement solidifies and the implantation position is not ideal, it will face great challenges for revision

On this basis, a method of hollow side hole pedicle screw combined with bone cement perfusion was developed. However, in this technology, the effective dosage of bone cement is very close to the leakage dosage, and the stability of the screw can be significantly improved only when the dosage of PMMA is greater than 1.5mL. However, when the dose is 2.02±0.56mL, about 33% of patients will leak, so this technique needs to be operated carefully, and this technique still cannot avoid the problems faced by the above-mentioned various bone cement nail channel reinforcement techniques

(2) The improvement of the screw itself mainly includes changing the length and diameter of the screw, changing the shape of the thread, designing the end of the screw as an expandable structure, and giving the screw a biological coating, etc., but the above-mentioned methods still cannot solve the problem of insufficient force. Both (too large or too small), bone healing at the contact interface, etc., and require high surgical techniques, can easily lead to secondary fractures, important organs such as paravertebral blood vessels, spinal nerve roots, and even spinal cord injuries in the spinal canal

In summary, the current improved technology of various screws cannot meet the clinical needs of osteoporosis patients.

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