CN212522095U

CN212522095U - Adjustable self-stress stimulation artificial vertebral body

Info

Publication number: CN212522095U
Application number: CN202020715333.3U
Authority: CN
Inventors: 马立泰; 杨毅; 刘浩
Original assignee: West China Hospital of Sichuan University
Current assignee: West China Hospital of Sichuan University
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2021-02-12
Anticipated expiration: 2030-04-30

Abstract

The utility model discloses an adjustable self-stress stimulation artificial vertebral body, which comprises an outer sleeve, an inner sleeve and a deformable structure; the outer sleeve and the inner sleeve are both provided with an opening at one end, the other end of the outer sleeve is provided with an end face, the opening end of the outer sleeve is sleeved at the opening end of the inner sleeve, the outer sleeve and the inner sleeve are in sliding fit, and the outer sleeve and the inner sleeve are supported by an adjustable elastic supporting structure; the deformable structure is positioned in the outer sleeve and the inner sleeve and supports the end surfaces of the outer sleeve and the inner sleeve, and the deformable structure comprises axial deformation along the outer sleeve and the inner sleeve; the side wall of the outer sleeve and/or the inner sleeve is provided with a bone grafting hole. The utility model discloses can provide axial stress and radial stress, be favorable to the growth and the fusion of skeleton to also can provide stress stimulation when the patient lies flat.

Description

Adjustable self-stress stimulation artificial vertebral body

Technical Field

The utility model relates to the field of medical equipment, especially, relate to an adjustable nodal pattern is from amazing artificial centrum of stress.

Background

The adjustable self-stress at the present stage stimulates the artificial vertebral body, has the function of distraction, but has complex operation when in distraction; failure to produce stable, appropriate elastic deformation and stress stimuli; in particular, the stress magnitude cannot be precisely adjusted and the problem of lack of stress stimulation in the horizontal position cannot be solved.

The stress stimulation, the growth and development of human bone tissues and the rehabilitation process of bone diseases are continuously modeled and rebuilt to adapt to the surrounding environment. The bone structure can be continuously reconstructed and shaped to adapt to the change of external environment only in the mechanical environment which is continuously adapted to bear stress stimulation generated by external force.

Stress adaptability of bones is also called functional adaptability of bones, and is characterized in that when bone needs to be increased, bone formation increases the capacity of the bones to complete the functions; when reduction is desired, there is bone resorption, reducing their ability to perform their function, and it is seen that changes in bone growth, development, atrophy and regression are closely related to the stresses to which they are subjected. The process of bone remodeling is the continuous growth, strengthening and resorption of living bone. The goal of bone reconstruction is always to adapt the internal structure and external morphology to changes in their loading environment, which can be divided into two categories: surface reconstruction and internal reconstruction. Resurfacing, which refers to the resorption or deposition of bone material on the bone surface, is a long slow process that typically lasts for months or years; the internal reconstruction refers to the change of the volume density and the quality of the bone tissue caused by the change of the mineral content and the porosity in the bone tissue, and can be completed in a short time. In humans, bone injury is remodeled in a short period of time, on the order of several weeks.

One study in russia and the united states showed that flying in space for more than 10 months resulted in total bone loss, with a 12% and 8.2% decrease in pelvis and femur, respectively, but the skull had no significant decrease in bone mass due to increased flow to the head as blood was redistributed under weightless conditions and blood flow stress was stimulated to compensate for head bone mass.

Stress shielding effect in bone biomechanics, and stress shielding phenomenon is important embodiment of bone reconstruction effect. In bone, osteoblasts and osteoclasts in bone tissue regulate the growth or resorption of bone by sensing mechanical stimuli. When the strain of the bone is lower than 50-100 micro strain and the stress is lower than 1-2MPa, the bone tissue absorbs; when the strain of the bone is higher than 1000-1500 micro strain and the stress is higher than about 20MPa, the bone tissue grows; when the strain of the bone is further higher than about 3000 microstrain and the stress is higher than about 60MPa, the bone tissue is damaged.

When stress shielding occurs in bone tissues, the stress level on bones is often in a low level for a long time, so that the bone tissues are gradually absorbed, osteoporosis of fracture parts is caused, and the bone tissues become an important cause of postoperative re-fracture.

Wolff's law: the function of the skeleton, which is to withstand the mechanical strain of the bone tissue during activity, has been recognized a century ago as the phenomenon known as Wolff's law (wulff's law). Bone forces aim to achieve an optimal structure, i.e. the morphology and material of the bone is regulated by the activity level of the individual, so that it is sufficient to bear the mechanical load, but not to increase the burden of metabolic transport.

Bones are living organisms and have their own laws of change. Wolff's law states that: bone growth is affected by mechanical stimuli to change its structure. The use is strong, and the waste is weak.

At present, various elastic deformation technologies utilize elastic materials and mechanical design, and utilize self gravity, deformation can be generated under the conditions of standing and loading and during standing activities, so that compression micro deformation can be generated, and the fractured ends or the bone grafting parts of vertebrae can bear more stress stimulation, thereby achieving the effects of stress promotion of bone formation, fracture healing and intervertebral fusion. The patient can not generate compression micro-deformation when lying down or lying in bed for sleeping, the average sleeping time of the adult can be about 8 hours, the postoperative patient can not bear load for a long time and has pain, the patient lying time can reach 15 hours or more, the bone grafting fusion and the rapid rehabilitation of the patient are not facilitated, and therefore the patient lying in bed for a long time after the operation is lack of stress stimulation to improve the design of the implant.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an adjustable nodal pattern is from the amazing artificial centrum of stress can provide axial stress and radial stress, is favorable to the growth and the integration of skeleton to also can provide the stress stimulation when the patient lies flat.

In order to achieve the purpose, the utility model adopts the following technical proposal to realize:

the utility model discloses an adjustable self-stress stimulation artificial vertebral body, which comprises an outer sleeve, an inner sleeve and a deformable structure; the outer sleeve and the inner sleeve are both provided with an opening at one end, the other end of the outer sleeve is provided with an end face, the opening end of the outer sleeve is sleeved at the opening end of the inner sleeve, the outer sleeve and the inner sleeve are in sliding fit, and the outer sleeve and the inner sleeve are supported by an adjustable elastic supporting structure; the deformable structure is positioned in the outer sleeve and the inner sleeve and supports the end surfaces of the outer sleeve and the inner sleeve, and the deformable structure comprises axial deformation along the outer sleeve and the inner sleeve; the side wall of the outer sleeve and/or the inner sleeve is provided with a bone grafting hole.

Furthermore, the side wall of the outer sleeve and/or the inner sleeve is provided with a plurality of through holes, the through holes are communicated with the inner cavity of the outer sleeve and/or the inner sleeve, and the plurality of through holes are arranged on the periphery of the outer sleeve and/or the inner sleeve.

Furthermore, the end surfaces of the outer sleeve and the inner sleeve are provided with non-locking nails, the non-locking nails are used for fixing the outer sleeve and the inner sleeve, and the non-locking nails are provided with micro-motion devices.

Preferably, the end surfaces of the outer sleeve and the inner sleeve are elastic alloy or the end surfaces of the outer sleeve and the inner sleeve are provided with a coating layer or the end surfaces of the outer sleeve and the inner sleeve are in a porous structure.

Furthermore, gaskets are arranged on the end surfaces of the outer sleeve and the inner sleeve.

Preferably, the adjustable elastic support structure comprises an expansion body and a screw, the expansion body is provided with an axial hole, the diameter of the screw is larger than that of the axial hole, the expansion body is positioned in a gap between the outer sleeve and the inner sleeve, and the expansion body is attached to the side wall of the outer sleeve or the inner sleeve.

As another preference, the adjustable resilient support structure comprises a lead screw thread adjustment mechanism.

Preferably, the deformable structure is an elastically deformable structure.

Preferably, the elastic deformation mechanism comprises a threaded spring, two ends of the threaded spring are respectively connected with elastic pieces, and the two elastic pieces respectively support the inner end surfaces of the outer sleeve and the inner sleeve.

The utility model has the advantages as follows:

1. the adjustable elastic supporting structure can adjust the axial stress of the adjustable self-stress stimulation artificial vertebral body, so that the stress is in an ideal range.

2. The deformable structure can provide radial stress for the adjustable self-stress stimulation artificial vertebral body, so that axial stress can be generated in the horizontal position after adjustment. When standing upright, the stress is aggravated by the self-gravity, and the stress transmitted by the bone rises.

3. Adjustable elastic support structure makes the utility model discloses can match not unidimensional.

Drawings

Fig. 1 is a sectional view of the present invention.

Fig. 2 is a front view of the present invention.

FIG. 3 is an enlarged partial view of a portion of the adjustable resilient support structure.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings.

As shown in fig. 1 and 2, the adjustable self-stress stimulation artificial vertebral body disclosed by the invention comprises an outer sleeve 2, an inner sleeve 1 and a deformable structure; the outer sleeve 2 and the inner sleeve 1 are both provided with an opening at one end, the other end is provided with an end face, the opening end of the outer sleeve 2 is sleeved at the opening end of the inner sleeve 1, the outer sleeve 2 and the inner sleeve 1 are in sliding fit, and the outer sleeve 2 and the inner sleeve 1 are supported through an adjustable elastic supporting structure 3; the deformable structure is positioned in the outer sleeve 2 and the inner sleeve 1, supports the end surfaces of the outer sleeve 2 and the inner sleeve 1 and comprises axial deformation along the outer sleeve 2 and the inner sleeve 1; the side wall of the outer sleeve 2 and/or the inner sleeve 1 is provided with bone grafting holes 6. The side wall of the outer sleeve 2 and/or the inner sleeve 1 is provided with a through hole 8, the through hole 8 is communicated with the inner cavity of the outer sleeve 2 and/or the inner sleeve 1, and a plurality of through holes 8 are arranged on the periphery of the outer sleeve 2 and/or the inner sleeve 1.

The end surfaces of the outer sleeve 2 and the inner sleeve 1 are elastic alloy or the end surfaces of the outer sleeve 2 and the inner sleeve 1 are provided with a coating layer 7 or the end surfaces of the outer sleeve 2 and the inner sleeve 1 are in a porous structure.

The end surfaces of the outer sleeve 2 and the inner sleeve 1 are provided with non-locking nails which are used for fixing the outer sleeve and the inner sleeve, and the non-locking nails are provided with micro-motion devices. The non-locking pin and the micro-motion device are conventional in the art and are not shown.

The deformation structure can adopt an elastic deformation mechanism, the elastic deformation mechanism comprises a threaded spring 5, two ends of the threaded spring 5 are respectively connected with elastic pieces 4, and the two elastic pieces 4 respectively support the inner end faces of the outer sleeve 2 and the inner sleeve 1.

As shown in fig. 3, the adjustable elastic support structure 3 comprises an expansion body 9 and a screw 11, the expansion body 9 is provided with an axial hole 10, the diameter of the screw 11 is larger than that of the axial hole 10, the expansion body 9 is positioned in the gap between the outer sleeve 2 and the inner sleeve 1, and the expansion body 9 is attached to the side wall of the outer sleeve 2 or the inner sleeve 1; when in use, the screw 11 is inserted into the axial hole 10, and the expansion body 9 is expanded by adjusting the screwing length of the screw 11.

The adjustable elastic supporting structure 3 can also adopt a screw rod thread adjusting mechanism such as a jack structure.

Of course, the present invention may have other embodiments, and those skilled in the art may make various corresponding changes and modifications according to the present invention without departing from the spirit and the essence of the present invention, and these corresponding changes and modifications should fall within the protection scope of the appended claims.

Claims

1. An adjustable self-stress stimulation artificial vertebral body is characterized in that: comprising an outer sleeve, an inner sleeve and a deformable structure; the outer sleeve and the inner sleeve are both provided with an opening at one end, the other end of the outer sleeve is provided with an end face, the opening end of the outer sleeve is sleeved at the opening end of the inner sleeve, the outer sleeve and the inner sleeve are in sliding fit, and the outer sleeve and the inner sleeve are supported by an adjustable elastic supporting structure; the deformable structure is positioned in the outer sleeve and the inner sleeve and supports the end surfaces of the outer sleeve and the inner sleeve, and the deformable structure comprises axial deformation along the outer sleeve and the inner sleeve; the side wall of the outer sleeve and/or the inner sleeve is provided with a bone grafting hole.

2. The adjustable self-stress stimulating artificial vertebral body of claim 1, wherein: the side wall of the outer sleeve and/or the inner sleeve is provided with a plurality of through holes, the through holes are communicated with the inner cavity of the outer sleeve and/or the inner sleeve, and the plurality of through holes are arranged on the periphery of the outer sleeve and/or the inner sleeve.

3. The adjustable self-stress stimulating artificial vertebral body of claim 1, wherein: the end surfaces of the outer sleeve and the inner sleeve are provided with non-locking nails, the non-locking nails are used for fixing the outer sleeve and the inner sleeve, and the non-locking nails are provided with micro-motion devices.

4. The adjustable self-stress stimulating artificial vertebral body of claim 1, wherein: the end surfaces of the outer sleeve and the inner sleeve are elastic alloy or the end surfaces of the outer sleeve and the inner sleeve are provided with coating layers or the end surfaces of the outer sleeve and the inner sleeve are in porous structures.

5. The adjustable self-stress stimulating artificial vertebral body of claim 4, wherein: and gaskets are arranged on the end surfaces of the outer sleeve and the inner sleeve.

6. The adjustable self-stress stimulating artificial vertebral body of any of claims 1-5, wherein: the adjustable elastic supporting structure comprises an expansion body and a screw, wherein the expansion body is provided with an axial hole, the diameter of the screw is larger than that of the axial hole, the expansion body is positioned in a gap between the outer sleeve and the inner sleeve, and the expansion body is attached to the side wall of the outer sleeve or the inner sleeve.

7. The adjustable self-stress stimulating artificial vertebral body of any of claims 1-5, wherein: the adjustable elastic support structure comprises a screw thread adjusting mechanism.

8. The adjustable self-stress stimulating artificial vertebral body of any of claims 1-5, wherein: the deformable structure is an elastic deformation mechanism.

9. The adjustable self-stress stimulating artificial vertebral body of claim 8, wherein: the elastic deformation mechanism comprises a threaded spring, two ends of the threaded spring are respectively connected with elastic pieces, and the two elastic pieces respectively support the inner end faces of the outer sleeve and the inner sleeve.