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Improved pourable pedicle screw

A technology of pedicle screw and self-tapping screw, which is applied in the direction of internal fixator, internal bone synthesis, fixer, etc., can solve the problems of unsatisfactory fixation effect and poor perfusion feasibility, and achieve improved fixation effect, sufficient perfusion, and improved The effect of fixed effects

Active Publication Date: 2014-03-05
SOUTHERN MEDICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the screw is screwed into the bone, the gap between the bottom of the screw teeth and the bone is still sealed by the head of the pedicle screw.
It can be seen that the scheme described in the utility model patent application with the authorized announcement number CN201591614U still has the defects of poor perfusion feasibility and unsatisfactory fixation effect

Method used

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  • Improved pourable pedicle screw
  • Improved pourable pedicle screw
  • Improved pourable pedicle screw

Examples

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Effect test

example 1

[0014] see Figure 1~5 , the screw head 2 of the pedicle screw is a round hexagonal countersunk head, the surface of the screw body 1 is provided with self-tapping screw teeth, forming a right-handed self-tapping screw; the center of the screw body 1 is provided with a The nail head 2 extends to the blind hole 3 at the tail, and the entrance of the blind hole 3 is provided with an internal thread, and an oozing hole 4 communicating with the thread groove 9 is provided at the tail near the nail body 1; The surface is provided with an axial groove 5 communicating with the oozing hole 4, and the two side walls of the axial groove 5 are inclined to the left-handed direction; the nail head of the pedicle screw is provided with a The threaded groove 9 communicates with the air vent hole 6, and the outlet of the vent hole 6 is provided with a flow regulating valve.

[0015] see Figure 5 , the flow regulating valve is composed of the outlet portion 8 of the exhaust hole 6 and the va...

example 2

[0018] see Figure 6-9 , compared with Example 1, the present embodiment has the same structure except the following two differences:

[0019] 1. There are four axial grooves 5, each of which is connected to the seepage hole 4;

[0020] 2. Two axial exhaust grooves 10 are symmetrically provided on the surface of the cylindrical part of the valve core 7 .

[0021] Compared with Example 1, the embodiment has additional exhaust grooves 10, so it is suitable for occasions where the pouring speed is relatively fast.

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Abstract

The invention relates to a surgical instrument, in particular to an improved pourable pedicle screw. At least one axial groove (5) communicated with a seepage hole (4) is arranged on the outer surface of a screw body (1) of the pedicle screw. The improved pourable pedicle screw is characterized in that an exhaust hole (6) enabling a thread groove (9) to be communicated with the air is arranged on the periphery of a blind hole (3) and on a screw end (2) of the pedicle screw, and a flow adjusting valve is arranged in an outlet of the exhaust hole(6). The flow adjusting valve is formed by an outlet portion (8) of the exhaust hole (6) and a valve core (7) matched with the outlet portion (8), wherein the valve core (7) is formed by a cylinder and a cone with the gradually-reduced section in sequence from the port of the outlet portion (8) of the exhaust hole (6), and the cylinder is in threaded connection with the outlet portion (8) of the exhaust hole (6). The improved pourable pedicle screw has the advantages of achieving fully pouring and having good fixing effect.

Description

technical field [0001] The invention relates to a surgical instrument, in particular to a perfusion pedicle screw used in a spinal positioner. Background technique [0002] As China accelerates into an aging society, osteoporosis has become an increasingly hot topic and research direction. In patients with osteoporosis, the bone content of the vertebrae decreases. Therefore, bone cement screw channel reinforcement is often required for elderly osteoporotic vertebrae to increase the holding force of the screw, but uneven bone cement distribution and excessive use of bone cement , Often lead to pseudarthrosis, bone cement extravasation and other accidents. The perfusion pedicle screws disclosed by the publication numbers CN101224132A, CN101966098A patent application for invention and the authorized announcement number CN201346237 and CN202113152U utility model patent application can solve the above problems. But the scheme described in the above-mentioned patent application ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B17/70A61B17/86
Inventor 吴卫东欧阳钧孙培栋吴长福
Owner SOUTHERN MEDICAL UNIVERSITY
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