Minimally invasive spine universal and unidirectional integration pedicle screw feeding system

Abstract

The invention relates to a minimally invasive spine universal and unidirectional integration pedicle screw feeding system which comprises a pedicle screw seat and a bulb screw mounted in the pedicle screw seat. The bulb screw comprises a rod portion and a bulb portion arranged at the top end of the rod portion, a spherical supporting surface is arranged on the inner wall of the bulb portion, a connecting portion is arranged at the center of the spherical supporting surface, the connecting portion and the rod portion are coaxially arranged, the connecting portion extends upwards, an outer spherical surface matched with the spherical supporting surface of the bulb portion is arranged at the bottom of the pedicle screw seat and can be inserted into the spherical supporting surface, an inner spherical surface is arranged on the inner wall of the bottom of the pedicle screw seat, an adjusting nut is arranged in the inner spherical surface in a sleeving manner, the outer wall of the adjusting nut is in interference fit with the inner spherical surface, and the inner wall of the adjusting nut is connected with the connecting portion of the bulb portion in a threaded manner. According to the minimally invasive spine universal and unidirectional integration pedicle screw feeding system, and the pedicle screw is rapidly, conveniently and easily fed and firmly implanted into human bones and does not easily loose.

Description

Technical field: [0001] The invention relates to the technical field of medical devices, in particular to a spinal minimally invasive universal one-way integrated pedicle screw screwing system. Background technique: [0002] When spinal fractures or spondylolisthesis need reduction, lumbar spine decompression needs to be stabilized to increase the fusion rate, an additional internal fixation system is often required, and the current percutaneous minimally invasive pedicle screw surgery system is through several key-sized holes , place screws and connecting rods accurately, without long incision and muscle stripping, avoiding damage to muscles caused by traditional open surgery, with small incision, less stripping, less trauma, less bleeding, beautiful appearance, and quick recovery, etc. Advantage. [0003] The existing minimally invasive zero-degree rotation pedicle screw screwing system generally includes a pedicle screw seat and a zero-degree ball head screw installed in...

AI Technical Summary

Problems solved by technology

[0003] The existing minimally invasive zero-degree rotation pedicle screw screwing system generally includes a pedicle screw seat and a zero-degree ball head screw installed in the pedicle screw seat, such as a new type of unidirectional screw disclosed by the patent No. CN203724199U. Universal two-in-one pedicle screw, however, due to the structural limitation of this type of pedicle screw screw system, the ball head has a stepped surface, which leads to a small contact surface between the ball head and the screw seat, and the rotation The ball head often comes out of the screw seat during use, which brings inconvenience to the operation

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