A multifunctional bone screw for poor bone condition

Abstract

The invention discloses a multifunctional bone screw applied to a bone with a poor sclerotin condition. The multifunctional bone screw applied to the bone with the poor sclerotin condition consists of an outer screw and a self-locking expanding bar, wherein the outer screw is a whole body formed by a screw body and a base, the interior of the screw body is a cylindrical hollow part, the tip part of the screw body is provided with a gap cut along the longitudinal axis of the screw body, circular gradient type interface reinforcing holes are symmetrically formed in the gap along the thread pitch of an outer thread at intervals and are communicated with the cylindrical hollow part, and the apertures of the gradient type interface reinforcing holes from the tip part of the screw body to the back part of the screw body are sequentially reduced; the self-locking expanding bar is a cylinder body, the diameter of the cylinder body is slightly smaller than the inner diameter of the cylindrical hollow part of the interior of the screw body, the front end of the self-locking expanding bar is conical, an inwards V-shaped groove is arranged at the conical back part of the self-locking expanding bar, the self-locking expanding bar is wedged with the cylindrical hollow part of the interior of the screw body after being embedded in the cylindrical hollow part of the screw body. The multifunctional bone screw applied to the bone with the poor sclerotin condition, which is disclosed by the invention, simultaneously expands the screw body and realizes self locking, and can realize stable fixation operation effect under a poor sclerotin operation condition.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a bone screw, in particular to a multifunctional bone screw for poor bone quality. Background technique [0002] Bone screw internal fixation technology is widely used in spinal internal fixation systems to correct vertebral fractures and congenital deformities caused by degenerative changes, trauma, inflammation, tumors, etc. However, due to the aggravation of the aging trend of the global population, the number of patients with osteoporosis characterized by osteopenia is increasing, and inflammation, tumors, etc. will lead to changes in the bone quality of the patient's systemic or local bones. The screw internal fixation technology is to enhance the holding force of the bone and the screw through the firm anchoring of the screw and the bone to maintain the stability of the spinal internal fixation system including the screw, and to achieve the purpose of correcting ver...

AI Technical Summary

Problems solved by technology

However, in the case of poor bone conditions such as osteoporosis, it is difficult for the screw and the bone to be tightly combined with each other, thus increasing the incidence of screw loosening and prolapse, and the short-term and long-term effects of the operation cannot be effectively guaranteed. Increased likelihood of renovation

In order to overcome the possibility of screw loosening in the case of poor bone quality, the current common clinical method for preventing screw loosening is to pour bone cement into the screw channel to increase the holding force of the screw, but directly pouring bone cement into the screw channel strengthens the screw channel as a whole. Uncontrollable amount of bone cement is prone to bone cement leakage, and at the same time forms a "bone-cement-screw" secondary interface, which has poor long-term stability

[0004] According to the data search done by the applicant, up to now, there is no bone screw that has a screw that expands and compacts the screw channel to enhance the screw interface while simultaneously reinforcing the screw interface with point-shaped side holes.

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