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Spinal posterior rigidity variable connecting rod

A connecting rod and rigid technology used in the field of medical devices to avoid osteoporosis

Inactive Publication Date: 2020-08-07
郝晓艳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide a rigid variable connecting rod for the posterior spinal column, which can be firmly fixed in the early stage of intervertebral fusion or vertebral fracture, and gradually reduce stress shielding in the middle and late stages of healing. Promote the rapid remodeling of intervertebral fusion or vertebral fractures under the stimulation that is gradually approaching physiological mechanics, and avoid the osteoporosis caused by stress shielding to related vertebral bodies; with the enhancement of vertebral body bone quality, the impact on fixation can be quickly reduced Material dependence, long-term problems are not easy

Method used

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  • Spinal posterior rigidity variable connecting rod
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  • Spinal posterior rigidity variable connecting rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 A Posterior Rigid Variable Connecting Rod

[0029] Such as figure 1 , figure 2 , image 3 and Figure 4 Commonly shown, the present invention provides a rigid variable connecting rod for posterior spinal column, including a first connecting rod 1, a first thin-diameter part 101 is provided at the middle of the main body of the first connecting rod 1, and the first narrow-diameter part 101 A first external threaded portion 102 and an annular body 103 are respectively provided on both sides, and both the first external threaded portion 102 and the annular body 103 are integrally formed with the main body of the first connecting rod 1 .

[0030] An annular filling cavity 104 is arranged in the end surface of the annular body 103 close to the first thin diameter portion 101, and the centerline of the annular filling cavity 104 is collinear with the centerline of the annular body 103; the interior of the annular filling cavity 104 is used Filled with absorbabl...

Embodiment 2

[0036] Example 2 A Posterior Rigid Variable Connecting Rod

[0037] Such as Figure 5 , Figure 6 and Figure 7 Commonly shown, the present invention provides a rigid variable connecting rod for posterior spinal column, including a second connecting rod 4, a second thin-diameter portion 41 is provided at the middle of the main body of the second connecting rod 4, and the second narrow-diameter portion 41 Both ends are respectively provided with second external threaded parts 42, and the second external threaded parts 42 are respectively sleeved with second support sleeves 5, and the two second support sleeves 5 are symmetrically arranged, and the structure of the second support sleeve 5 is the same as that of The structure of the first support sleeve 2 is the same; the inner end of the second support sleeve 5 is sleeved at the step 62 of the absorbable inner core 6 and abuts against it.

[0038] The absorbable inner core 6 is sheathed on the outside of the second thin diame...

Embodiment 3

[0043] Example 3 A Posterior Rigid Variable Connecting Rod

[0044] Such as Figure 8 and Figure 9 Commonly shown, the present invention provides a rigid variable connecting rod for posterior spinal column, including a third connecting rod 7, a third thin diameter portion 71 is provided at the middle of the main body of the third connecting rod 7, and the third narrow diameter portion 71 There are several laminations 72 arranged at equal intervals on the outside, and filling gaps 73 are arranged between adjacent laminations 72, and the filling gaps 73 are used to fill absorbable materials; the laminations 72 are provided with four evenly distributed circumferentially. The slot 74 is used for filling the absorbable material; the absorbable material filled in the slot 74 and the absorbable material filled in the filling gap 73 are integrally filled.

[0045] Both ends of the third connecting rod 7 are fixed in the U-shaped opening of the pedicle screw 3 respectively.

[0046...

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PUM

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Abstract

The invention discloses a spinal posterior rigidity variable connecting rod, which comprises a first connecting rod body, a second connecting rod body and a third connecting rod body. The rigidity ofthe three types of connecting rod bodies is gradually changed into flexibility in the sclerotin fusion process, so that stress shielding is reduced, and remodeling of bones is promoted. The inventionprovides the spinal posterior rigidity variable connecting rod, firm fixation can be achieved in the early stage after interbody fusion or vertebral fracture operation, stress shielding is gradually reduced in the middle and later stages of healing, rapid remodeling of interbody fusion or vertebral fracture parts is promoted under stimulation gradually close to physiological mechanics, and the osteoporosis problem caused by stress shielding to related vertebral bodies is avoided; the dependence on a fixture can be quickly reduced along with the enhancement of vertebral sclerotin, and problemsare not easy to occur in the later period of healing.

Description

technical field [0001] The invention relates to a rigid variable connecting rod for posterior spinal column, which belongs to the technical field of medical instruments. Background technique [0002] For spinal surgery of intervertebral fusion or vertebral body fracture, the fixation of the screw-rod system is often used to provide a stable environment for the fusion of the vertebral body. The screw-rod systems in the prior art are generally metal fixtures, which will produce stress shielding. Even titanium alloys have a modulus of elasticity that is more than ten times higher than that of cortical bone. The existence of stress shielding will cause related vertebral bones to The vertebral body is prone to problems when the fixation of the screw-rod system becomes loose or fails. [0003] In summary, there is no ideal solution to the problem of stress shielding of fixtures in the prior art, and this technical problem has been perplexing those skilled in the art. The variabl...

Claims

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Application Information

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IPC IPC(8): A61B17/70
CPCA61B17/701A61B17/7013A61B17/7014A61B17/7032A61B17/7035
Inventor 封亮亮
Owner 郝晓艳