CN218420005U

CN218420005U - Novel pedicle screw structure

Info

Publication number: CN218420005U
Application number: CN202221679131.3U
Authority: CN
Inventors: 孔清泉; 冯品; 刘俊麟; 李浪
Original assignee: Tibet Autonomous Region People's Government In Chengdu Office Hospital
Current assignee: Tibet Autonomous Region People's Government In Chengdu Office Hospital
Priority date: 2022-07-01
Filing date: 2022-07-01
Publication date: 2023-02-03
Anticipated expiration: 2032-07-01

Abstract

The invention discloses a novel pedicle screw structure, and belongs to the technical field of medical instruments and equipment. Novel pedicle of vertebral arch screw carries out function subregion differentiation design according to the sclerotin structure of the different position contacts of centrum and bears mechanical properties, specifically including first section function subregion structure (1) that is located screw cone head and second section function subregion structure (2) that is located screw cone root, first section function subregion structure (1) is including bionical class bone porous structure (3) and sparse long-distance helicitic texture (4), and second section function subregion structure (2) is including solid compact structure (5) and the short-distance helicitic texture of the secret (6) make the screw can be fixed with bone tissue through screw machinery closure and biological bony nature combination mode simultaneously, can strengthen screw and host bone tissue biological fixation, have wide application prospect in the fixed of human cervical vertebra, lumbar vertebrae and support.

Description

Novel pedicle screw structure

Technical Field

The utility model belongs to the technical field of medical instrument equipment, especially, relate to novel pedicle of vertebral arch screw structure.

Background

The vertebral pedicle screw internal fixing system has firm three-dimensional fixing effect and good biomechanical stability, and can provide enough opening, pressurizing, locking and the like after operation to achieve the treatment purposes of spine deformity correction, spine trauma fracture reduction, fixation and fusion, so that the curative effect of the spine surgery is more definite, the design pushes the spine surgery to a new height, and the vertebral pedicle screws are most widely applied clinically at present. However, with the wide clinical application, the pedicle screw is loosened, pulled out and broken, which results in failure of the internal fixation operation, and thus higher requirements are provided for the fixation strength of the screw. In the process of applying the pedicle screw, complications such as loosening, extraction and fracture often occur.

SUMMERY OF THE UTILITY MODEL

The utility model provides a novel pedicle of vertebral arch screw structure, the bony structure and the bearing mechanical properties that carry out function partition differentiation design according to the different position contacts of centrum for the screw can be fixed with bone tissue through screw thread mechanical closure and biological osseous nature combination mode simultaneously, can strengthen screw and host bone tissue biological fixation, has wide application prospect in the fixed of human cervical vertebra, lumbar vertebrae and support.

The utility model discloses a following technical scheme realizes:

the utility model provides a novel pedicle of vertebral arch screw structure, its characterized in that has segmentation function partition structure, specifically includes first section function partition structure 1 that is located screw cone head and the second section function partition structure 2 that is located screw cone root, first section function partition structure 1 is including bionical class bone porous structure 3 and sparse long-distance helicitic texture 4, and second section function partition structure 2 is including solid compact structure 5 and the short-distance helicitic texture 6 of secret.

Optionally, the pedicle screw further comprises a third functional partition structure section integrally covering the surface of the screw, wherein the third functional partition structure section comprises a nano-scale topological structure and capillary micropores thereof.

Alternatively, in the pedicle screw, the nano-scale topology and its capillary pores may have a size in the range of 20-200nm.

Alternatively, in the above pedicle screw, the pedicle screw further comprises a central through bore 7 in the axial direction.

Optionally, in the pedicle screw, the bionic bone-like porous structure has a natural bone tissue-like macroscopic microporous structure, the porosity of the bionic bone-like porous structure is 40% -80%, the pore diameter of the bionic bone-like porous structure is 250-850 μm, and the pore shape of the bionic bone-like porous structure is a bionic bone-like trabecular micropore.

Optionally, in the pedicle screw, the bionic bone-like porous structure is formed by diamond structure unit bodies, the edge width of each unit body is 300-400 μm, and the pore diameter is 600-700 μm. Furthermore, the bionic bone-like porous structure is composed of diamond structure unit bodies, wherein the edge width of each unit body is 400 micrometers, and the pore diameter is 600 micrometers.

Alternatively, in the pedicle screw, the thread parameters of the tightness short-distance thread structure are 1mm in thread height, 1.25mm in thread pitch and 5 degrees in thread surface angle, and the length of the thread is 1/2-1/3 of the total length of the thread of the biological fixation type pedicle screw.

Optionally, in the pedicle screw, the thread parameters of the sparse long-distance thread structure are 1mm in thread height, 2.5mm in thread pitch and 5 degrees in thread surface angle, and the sparse long-distance thread length of the screw vertebral body part is 20-30mm and is 1/2-1/3 of the total length of the screw thread.

Optionally, in the pedicle screw, the material is titanium alloy.

All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

The invention has the beneficial effects that:

(1) Pedicle of vertebral arch screw's nail body root design is for having the dense helicitic texture of coarse interface, connects backbone cortex bone part, and the mechanical locking intensity between reinforcing and cortex bone guarantees the intensity and the stability that pedicle of vertebral arch screw and organism combine.

(2) Pedicle of vertebral arch screw is at titanium alloy pedicle of vertebral arch nail surface construction nanometer class bone apatite biological activity coating, realizes titanium alloy surface interface biological activity from inexistence to having, and organism and implant realization have the ossification to combine, make biological fixed type pedicle of vertebral arch screw have excellent stability and long-term stability at once, effectively overcome the not hard up, extract of traditional pedicle of vertebral arch screw and the complication of rupture.

Description of the drawings:

figure 1 is the structure schematic diagram of the novel pedicle screw

The specific implementation mode is as follows:

the above-mentioned aspects of the present invention will be further described in detail by the following embodiments of the examples. This should not be understood as limiting the scope of the above-described subject matter of the present invention to the following examples only. Any modification made without departing from the spirit and principle of the present invention and equivalent replacement or improvement made according to the common technical knowledge and the conventional means in the field should be included in the protection scope of the present invention.

Example 1:

the utility model provides a titanium alloy pedicle of vertebral arch screw structure, is including the first section function subregion structure 1 that is located screw cone head and the second section function subregion structure 2 that is located screw cone root, first section function subregion structure 1 is including bionical class bone porous structure 3 and sparse long-pitch helicitic texture 4, and second section function subregion structure 2 is including solid compact structure 5 and the short-pitch helicitic texture 6 of secret.

Optionally, in the pedicle screw, the pedicle screw further comprises a central through hole 7 along the axial direction, the central through hole has a navigation function, and when the pedicle screw is implanted, the bone needle is firstly punched, and then the pedicle screw is implanted in a navigation mode.

Alternatively, in the pedicle screw, the bionic bone-like porous structure is formed by diamond structure unit bodies, the edge width of each unit body is 400 μm, and the pore diameter is 600 μm.

Alternatively, in the pedicle screw, the thread parameters of the sparse long-distance thread structure are 1mm in thread height, 2.5mm in thread pitch and 5 degrees in thread surface angle, and the sparse long-distance thread length of the vertebral body part of the screw is 20-30mm which is 1/2-1/3 of the total length of the thread of the screw.

A schematic diagram of the biological fixation pedicle screw obtained in this example is shown in figure 1,

example 2:

a pedicle screw structure comprises a first section of functional partition structure 1 positioned at the head of a screw cone and a second section of functional partition structure 2 positioned at the root of the screw cone, wherein the first section of functional partition structure 1 comprises a bionic bone-like porous structure 3 and a hydrophobic long-distance thread structure 4, and the second section of functional partition structure 2 comprises a solid compact structure 5 and a dense short-distance thread structure 6; the screw also comprises a third-stage functional partition structure integrally covering the surface of the screw, wherein the third-stage functional partition structure comprises a nano-scale topological structure and capillary micropores thereof.

Further, in the pedicle screw, the nano-scale topological structure and the capillary micropores thereof have a size range of 20-200nm.

Optionally, the pedicle screw further comprises a third-stage functional partition structure integrally covering the surface of the screw, wherein the third-stage functional partition structure comprises a nano-scale topological structure and capillary micropores thereof.

Alternatively, in the pedicle screw, the material is titanium alloy.

Example 3:

in example 2, the trabecular bone-like porous structure of the first stage functional partition structure was changed to a solid dense structure. It differs from example 2 only in that: in this embodiment, the first stage of functional partition structure is not constructed, but the bone-like trabecula porous structure is changed into a solid compact structure, similar to the second stage of functional partition structure. Therefore, in this embodiment, the obtained pedicle screw has no bionic bone-like porous structure, has a relatively large elastic modulus compared with bone, is easy to cause stress shielding after implantation, causes adjacent bone absorption, causes loosening and falling of the pedicle screw, and does not reserve a space for new bone growth, so that the body-implant interface is difficult to form organic integration, and the purpose of biological fixation cannot be realized.

Example 4:

in example 2, a circular channel placed in the center of the screw and running through the screw was not designed. It differs from example 2 only in that: the round through hole is not constructed in the center of the pedicle screw in the embodiment. In this embodiment, the screw can only carry out drug loading in a porous structure, the primary total drug loading is reduced, and long-term drug treatment effect cannot be realized by a method of minimally invasive post-injection. Meanwhile, after the drug-loaded hydrogel is degraded, the function of reducing the pressure of the medullary core is lost, and the regeneration and repair of the pyramidal bone are influenced to a certain extent. In addition, the tissue ingrowth space is reduced, affecting the stability of the screw to some extent. In conclusion, the pedicle screws designed according to this comparative example have a reduced "bio-fixation" capacity.

Claims

1. The utility model provides a novel pedicle of vertebral arch screw structure, its characterized in that has segmentation function partition structure, specifically includes first section function partition structure (1) that is located screw cone head and second section function partition structure (2) that is located screw cone root, first section function partition structure (1) is including bionical class bone porous structure (3) and sparse long-distance helicitic texture (4), and second section function partition structure (2) are including solid compact structure (5) and the short-distance helicitic texture of the secret (6).

2. The pedicle screw structure according to claim 1, further comprising a third segment of a functionally partitioned structure integrally covering the surface of the screw, including a nano-scale topology and its capillary pores.

3. The pedicle screw structure according to claim 2, wherein the nano-scale topology and its capillary pores have a size in the range of 20-200nm.

4. A pedicle screw structure as claimed in claim 1, further comprising an axially central through bore.

5. The pedicle screw structure according to claim 1, wherein the bionic bone-like porous structure has a natural bone tissue-like macroscopic microporous structure, a porosity of 40-80%, a pore diameter of 250-850 μm, and a pore shape of bionic bone-like trabecular micropores.

6. A pedicle screw structure as claimed in claim 1, wherein the bionic bone-like porous structure is composed of diamond structure unit bodies, the unit bodies have a width of 300-400 μm and a pore size of 600-700 μm.

7. Pedicle screw structure according to claim 1, wherein the bionic bone-like porous structure is made of diamond-like structure unit bodies with a width of 400 μm and a pore size of 600 μm.

8. A pedicle screw structure as claimed in claim 1, wherein the thread parameters of the tightness short pitch thread structure are thread height 1mm, thread pitch 1.25mm, thread face angle 5 °, and its length is 1/2-1/3 of the total length of the thread of the pedicle screw structure.

9. The pedicle screw structure according to claim 1, wherein the thread parameters of the sparse long pitch thread structure are 1mm thread height, 2.5mm thread pitch, 5 ° thread face angle, and 20-30mm sparse long pitch thread length of the screw vertebral body part, which is 1/2-1/3 of the total length of the screw thread.

10. The pedicle screw structure according to claim 1, wherein the material is titanium alloy.