Combined pourable pedicle screw system

A pedicle screw and combined technology, which is applied in the field of filler screws, can solve problems such as easy pull-out, PMMA backflow, large structural resistance, etc., achieve small push rod thrust, enhance fixation strength and stability, The effect that the screw is not easy to loosen

Inactive Publication Date: 2016-09-21
王志荣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the prior art, the design structure of the perfusion pedicle screw is: the channel of the side seepage hole is at a 90° right angle to the hollow structure, and there will be the following problems: 1. Due to the backflow generated by the PMMA itself, this The exudation holes of this kind of structure will cause the PMMA to flow backward, firstly, the stability is poor and easy to pull out, and secondly, it is closer to the vertebral foramen, which is likely to cause risks; 2. The resistance of this type of structure is too large, and the bone cement that is too viscous is difficult to squeeze out by hand side seepage hole

Method used

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  • Combined pourable pedicle screw system
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  • Combined pourable pedicle screw system

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Such as Figure 1-3 As shown, in order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a combined perfusion pedicle screw system, including a nail body 1 with a hollow structure 9 inside, and an integrally formed cross-bar fixing at the end of the nail body 1 Structure 2. A filling cylinder 3 with one end connected to the nail body 1 and a push rod matched with the filling cylinder 3. The nail body 1 is provided with an external thread 4, and the nail body 1 is provided with a seepage port 5 connected to the hollow structure 9 , The pouring cylinder 3 is a through-hole structure, one end of which is connected to the nail body 1 is provided with a connecting structure 6 that matches the hollow wall at the end of the nail body 1, and the other end is provided with an injection port 7, and the hollow structure is provided with the shape of the hollow structure In line with the core 11.

[0040] The cross-bar fixing structur...

Embodiment 2

[0054] Such as Figure 4 As shown, in order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a combined perfusion pedicle screw system, including a nail body 1 with a hollow structure 9 inside, and an integrally formed cross-bar fixing at the end of the nail body 1 Structure 2. A filling cylinder 3 with one end connected to the nail body 1 and a push rod matched with the filling cylinder 3. The nail body 1 is provided with an external thread 4, and the nail body 1 is provided with a seepage port 5 connected to the hollow structure 9 , The pouring cylinder 3 is a through-hole structure, one end of which is connected to the nail body 1 is provided with a connecting structure 6 that matches the hollow wall at the end of the nail body 1, and the other end is provided with an injection port 7, and the hollow structure is provided with the shape of the hollow structure Compatible inner core.

[0055] The channel connecting the hollow s...

Embodiment 3

[0063] Such as Figure 5 As shown, in order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a combined perfusion pedicle screw system, including a nail body 1 with a hollow structure 9 inside, and an integrally formed cross-bar fixing at the end of the nail body 1 Structure 2. A filling cylinder 3 with one end connected to the nail body 1 and a push rod matched with the filling cylinder 3. The nail body 1 is provided with an external thread 4, and the nail body 1 is provided with a seepage port 5 connected to the hollow structure 9 , The pouring cylinder 3 is a through-hole structure, one end of which is connected to the nail body 1 is provided with a connecting structure 6 that matches the hollow wall at the end of the nail body 1, and the other end is provided with an injection port 7, and the hollow structure is provided with the shape of the hollow structure Compatible inner core.

[0064] The channel connecting the hollow s...

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Abstract

The invention discloses a combined pourable pedicle screw system. The combined pourable pedicle screw system comprises a screw body with a hollow structure in the interior, a transverse rod fixation structure located at the tail end of the screw body and integrally formed, a pouring drum with one end connected with the screw body, and a push rod matching with the pouring drum. An external screw thread is arranged in the nail body which is provided with an effusion port communicating with the hollow structure. The pouring drum is of a structure of a through hole. The end where the pouring drum is connected with the nail body is provided with a connecting structure matching with the hollow wall at the tail end of the nail body. The other end is provided with a pouring port. The hollow structure is internally provided with an inner core in accord with the hollow structure in the shape. The combined pourable pedicle screw system has following beneficial effects: the inner core is utilized for locking the hollow structure after PMMA is pressed such that PMMA of the nail body, PMMA of the hollow structure and the inner core can be connected as a whole; fixation strength and stability of the screw can be greatly improved; the screw is not easily loosened and pulled out; and the combined pourable pedicle screw system is also adapted to people of osteoporosis.

Description

Technical field [0001] The invention relates to a surgical instrument, in particular to a screw used in pedicle screw implantation operations that can be filled with bone cement and other fillers. Background technique [0002] In spinal surgery, the internal fixation technique using pedicle screws has a history of more than 50 years. The main role of spinal internal fixation is to stabilize the dynamic segments of the spine to promote its fusion. According to the "three-column theory", the spine can be divided into three columns, anterior, middle, and posterior, and the pedicle is the only channel that penetrates and connects the three columns. Transpedicular internal fixation has the best mechanical stability. In the past, pedicle screw implantation operations, in simple terms, included two processes: nail path preparation and implantation screw fixation. It has been clinically shown for many years that even if the screw is implanted in the correct position and direction, there...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): A61B17/70A61B17/86A61B17/88
CPCA61B17/7062A61B17/7097A61B17/862A61B17/8625A61B17/864A61B17/8685A61B17/8805A61B17/8825A61B2017/564
Inventor王志荣杨惠林罗宗平张文
Owner王志荣