CN210749455U

CN210749455U - Bone screw

Info

Publication number: CN210749455U
Application number: CN201921135551.3U
Authority: CN
Inventors: 王峰; 许可; 张华�
Original assignee: Jinling Institute of Technology
Current assignee: Jinling Institute of Technology
Priority date: 2019-07-19
Filing date: 2019-07-19
Publication date: 2020-06-16
Anticipated expiration: 2029-07-19

Abstract

The utility model discloses a bone screw, wherein: including the screw body and the interior inlay, the spiral shell body divide into the triplex from top to bottom: go up the spiral part, well spiral part and lower spiral part, threaded clearance has between the screw thread of top spiral part and well spiral part surface, the screw body is provided with axial filling groove, a plurality of bone filler filling hole has been seted up in well spiral part, bone filler filling hole one end opening is in well spiral part surface, the other end and filling groove lower part intercommunication, the embedded body includes tractive section and filling section, the tractive section comprises interconnect's tractive head and tractive pole, the filling section upper end is provided with and supplies tractive pole male screw hole, filling section lower part is provided with has elastic filling protruding with bone filler filling hole one-to-one, the embedded body can be inserted in filling the groove with pulling out. The utility model has the advantages of good fixing effect.

Description

Bone screw

Technical Field

The utility model belongs to the technical field of and medical instrument, concretely relates to bone screw.

Background

Bone screws, such as pedicle screws, dynamic hip screws, and the like, are used for hip and intravertebral fixation implants. This technique has been applied as a common internal implant technique for treating bone fractures or deformities. Generally, the bone screw is fixed by being inserted into a bone through an operation, but for a patient diagnosed with osteoporosis, the bonding force between the bone screw and the bone is greatly reduced, and if artificial bone medium can be filled between the bone screw and a bone substance after the bone screw is implanted, the bonding force between the bone screw and the bone can be effectively improved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that to the not enough of above-mentioned prior art, provide a fixed effectual bone screw.

In order to realize the technical purpose, the utility model discloses the technical scheme who takes does:

a bone screw, wherein: including the screw body and the interior embedding body, the screw body is including the screw cap, the spiral shell body and the nail point that from top to bottom connect gradually, and the spiral shell body divide into the triplex of body coupling from top to bottom: the screw comprises an upper screw part, a middle screw part and a lower screw part, the diameters of the upper screw part and the middle screw part are larger than those of the lower screw part, a thread gap is formed between threads on the outer surface of the upper screw part and the outer surface of the middle screw part, no gap is formed between the threads on the surface of the lower screw part, an axial filling groove is formed in a screw body, the upper end of the filling groove is opened at the upper end of a screw cap, the lower end of the filling groove is a blind end and extends to the lower part of the middle screw part, a plurality of bone filler filling holes are formed in the middle screw part, one end of each bone filler filling hole is opened on the outer surface of the middle screw part, the other end of each bone filler filling hole is communicated with the lower part of the filling groove, the opening of each bone filler filling hole in the outer surface of the middle screw part is positioned at the thread gap, the embedded body comprises a traction section and a filling section, the traction section is composed of a traction head and a traction rod which are connected with each other, the inner inlay is inserted in the filling groove in a pull-out manner, the filling protrusion blocks the bone filler filling hole, and when the traction rod is driven by the traction rod to be screwed out from the threaded hole part of the filling section, the traction rod is positioned outside the filling groove.

In order to optimize the technical scheme, the specific measures adopted further comprise:

the blind end of the threaded hole of the filling section is provided with a limiting cavity, the lower end of the traction rod is fixed with a clamping protrusion, the clamping protrusion is located in the limiting cavity, the diameter of the clamping protrusion is larger than that of the threaded hole of the filling section, and the clamping protrusion cannot be separated from the limiting cavity from the threaded hole of the filling section.

The filling section is provided with a placing groove at the corresponding position of the filling protrusion, and when the inner inlay is separated from the filling groove, the filling protrusion is extruded by the side wall of the filling groove and is bent into the placing groove.

The material of the filling section is medical plastic.

The upper surface of the screw cap is provided with a straight or cross spiral line.

The upper surface of the drawing head is provided with a linear or cross-shaped spiral line corresponding to the spiral line of the screw cap.

The screw body is a titanium alloy screw.

The size of the thread clearance is 3mm to 4 mm.

The utility model discloses a bone screw, set up interior inlay and the internal and external two part structure of screw, and the main part of screw has divided into the upper and middle portion of revolving that is used for increasing the cohesion and has fine penetrating power down the portion of revolving, the utility model discloses set up the screw clearance at screw middle part, and set up bone filler filling hole in the screw clearance, block up bone filler filling hole with interior inlay, when bone screw bores into the bone, the screw clearance is not direct and sclerotin hard contact, only partial bone sediment can fall in screw clearance department, the inlay guarantees that bone filler filling hole can not be blockked up by bone sediment, after screw body screw in sclerotin preposition, through taking out interior inlay, make filling groove and screw clearance intercommunication, at this moment, to filling the inslot into bone filler, make filler fill filling groove, bone filler filling hole and screw clearance, make sclerotin and bone filler melt into an organic whole, effectively promote the degree of combination with the skeleton, the loosening of the bone screw is avoided.

Drawings

Fig. 1 is an external schematic view of the present invention;

FIG. 2 is a perspective view of FIG. 1;

FIG. 3 is a cross-sectional view of the screw body;

FIG. 4 is a cross-sectional view of the inlay;

FIG. 5 is a schematic view of the outer structure of the inlay;

fig. 6 is a top view of fig. 1.

The reference signs are: the screw comprises a screw body 1, a screw cap 11, a screw body 12, an upper rotating part 12a, a middle rotating part 12b, a lower rotating part 12c, a thread gap 12d, a nail tip 13, a filling groove 14, a bone filler filling hole 15, an inner embedded body 2, a pulling section 21, a pulling head 21a, a pulling rod 21b, a clamping convex 21c, a filling section 22, a filling convex 22a, a limiting cavity 22b and a placing groove 22 c.

Detailed Description

Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.

As shown in fig. 1-3, the utility model relates to a bone screw, wherein: including the screw body 1 and the embedded body 2, the screw body 1 is including the screw cap 11, the spiral shell body 12 and the nail point 13 that from top to bottom connect gradually, and spiral shell body 12 is divided into the triplex of body coupling from top to bottom: the screw comprises an upper rotating part 12a, a middle rotating part 12b and a lower rotating part 12c, the diameters of the upper rotating part 12a and the middle rotating part 12b are larger than that of the lower rotating part 12c, a thread gap 12d is formed between threads on the outer surfaces of the upper rotating part 12a and the middle rotating part 12b, no gap is formed between threads on the surface of the lower rotating part 12c, an axial filling groove 14 is arranged on a screw body 1, the upper end of the filling groove 14 is opened at the upper end of a screw cap 11, the lower end of the filling groove is a blind end and extends to the lower part of the middle rotating part 12b, a plurality of bone filler filling holes 15 are arranged on the middle rotating part 12b, one end of each bone filler filling hole 15 is opened on the outer surface of the middle rotating part 12b, the other end of each bone filler filling hole 15 is communicated with the lower part of the filling groove 14, the opening of the outer surface of the middle rotating part 12b is positioned at the thread gap 12d, an embedded body 2 comprises a pulling section 21 and a filling section 22, the pulling section 21 consists of, the traction head 21a can drive the traction rod 21b to rotate and screw in or out from the threaded hole of the filling section 22, the lower part of the filling section 22 is provided with elastic filling protrusions 22a which correspond to the bone filling holes 15 one by one, the inner embedded body 2 can be inserted into the filling groove 14 in an extractable mode, the filling protrusions 22a block the bone filling holes 15, and when the traction head 21a drives the traction rod 21b to screw out from the threaded hole part of the filling section 22, the traction head 21a is positioned outside the filling groove 14.

In the embodiment, a limit cavity 22b is arranged at the blind end of the threaded hole of the filling section 22, a clamping protrusion 21c is fixed at the lower end of the pulling rod 21b, the clamping protrusion 21c is located in the limit cavity 22b, and the diameter of the clamping protrusion 21c is larger than that of the threaded hole of the filling section 22, so that the clamping protrusion 21c cannot be separated from the limit cavity 22b from the threaded hole of the filling section 22.

In the embodiment, the filling segment 22 is provided with a seating groove 22c at a position corresponding to the filling protrusion 22a, and when the insert body 2 is detached from the filling groove 14, the filling protrusion 22a is pressed by the sidewall of the filling groove 14 and is bent into the seating groove 22 c.

In an embodiment, the material of the filler section 22 is a medical grade plastic.

In the embodiment, the screw cap 11 has a straight or cross-shaped spiral thread on its upper surface.

In the embodiment, the upper surface of the pulling head 21a is provided with a straight or cross-shaped spiral thread corresponding to the spiral thread of the screw cap 11.

In the embodiment, the screw body 1 is a titanium alloy screw.

In the embodiment, the thread clearance 12d has a clearance size of 3mm to 4 mm.

The utility model discloses a use as follows: as shown in fig. 1 and 2, the device of the present invention is assembled, at this time, the inner insert body 2 is located in the filling groove 14 of the screw body 1, the pulling head 21a is at the lower end of the stroke, the height of the pulling head 21a is flush with the height of the screw cap 11, the filling protrusion 22a blocks the bone filler filling hole 15 (in the actual manufacturing, the shape of the filling protrusion 22a is shorter and flat than that of fig. 2 to 5, this fig. 2-5 is a schematic view, which is different from the actual product structure, but is the same in function), when the screw body 1 penetrates the bone of the patient, the upper screwing part 12a is left in the cortical bone, the middle screwing part 12b and the lower screwing part 12c enter into the cancellous bone, then the pulling head 21a is screwed outwards to make the height of the pulling head 21a higher than the screw cap 11, so as to clamp the pulling head 21a to pull out the whole inner insert body 2 from the screw body 1, at this time, the filling protrusion 22a leaves the bone, the bone filler is injected into the filling groove 14, so that the outer part of the middle rotating part 12b is also filled with the bone filler, and when the filling groove 14 is filled with a sufficient amount of the bone filler, the bone screw is fixed. After the bone filler is hardened, the bone filler is integrated with the bone, so that the screw body 1 is buried in the bone and cannot be loosened.

Above only the utility model discloses an it is preferred embodiment, the utility model discloses a scope of protection not only limits in above-mentioned embodiment, and the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, a plurality of modifications and decorations without departing from the principle of the present invention should be considered as the protection scope of the present invention.

Claims

1. A bone screw, characterized by: including the screw body (1) and interior embedding body (2), the screw body (1) including screw cap (11), spiral shell body (12) and nail point (13) that from top to bottom connect gradually, spiral shell body (12) divide into the triplex of body coupling from top to bottom: the screw comprises an upper screw part (12a), a middle screw part (12b) and a lower screw part (12c), wherein the diameter of the upper screw part (12a) and the middle screw part (12b) is larger than that of the lower screw part (12c), a thread gap (12d) is formed between threads on the outer surface of the upper screw part (12a) and the middle screw part (12b), no gap is formed between threads on the surface of the lower screw part (12c), an axial filling groove (14) is formed in the screw body (1), the upper end of the filling groove (14) is opened at the upper end of a screw cap (11), the lower end of the filling groove is a blind end and extends to the lower part of the middle screw part (12b), a plurality of bone filler filling holes (15) are formed in the middle screw part (12b), one end of each bone filler filling hole (15) is opened on the outer surface of the middle screw part (12b), the other end of each bone filler filling hole is communicated with the lower part of the filling groove (14), and the opening of each bone filler filling hole (15) on the outer surface, the inlay (2) comprises a pulling section (21) and a filling section (22), the traction section (21) consists of a traction head (21a) and a traction rod (21b) which are connected with each other, the upper end of the filling section (22) is provided with a threaded hole for inserting the traction rod (21b), the pulling head (21a) can drive the pulling rod (21b) to rotate and screw in or out from the threaded hole of the filling section (22), the lower part of the filling section (22) is provided with elastic filling bulges (22a) which are in one-to-one correspondence with the bone filler filling holes (15), the inner inlay (2) can be inserted into the filling groove (14) in a pull-out way, and the filling protrusion (22a) blocks the bone filler filling hole (15), and when the traction head (21a) drives the traction rod (21b) to unscrew from the threaded hole part of the filling section (22), the traction head (21a) is positioned outside the filling groove (14).

2. A bone screw as in claim 1, wherein: the blind end of the threaded hole of the filling section (22) is provided with a limiting cavity (22b), the lower end of the pulling rod (21b) is fixed with a clamping protrusion (21c), the clamping protrusion (21c) is located in the limiting cavity (22b), the diameter of the clamping protrusion (21c) is larger than the diameter of the threaded hole of the filling section (22), and the clamping protrusion (21c) cannot be separated from the limiting cavity (22b) from the threaded hole of the filling section (22).

3. A bone screw as claimed in claim 2, wherein: the filling section (22) is provided with a placing groove (22c) at the position corresponding to the filling protrusion (22a), and when the inner inlay (2) is separated from the filling groove (14), the filling protrusion (22a) is extruded by the side wall of the filling groove (14) and is bent into the placing groove (22 c).

4. A bone screw as claimed in claim 3, wherein: the filling section (22) is made of medical plastics.

5. A bone screw according to claim 4, wherein: the upper surface of the screw cap (11) is provided with a linear or cross spiral grain.

6. A bone screw according to claim 5, wherein: the upper surface of the traction head (21a) is provided with a linear or cross-shaped spiral line corresponding to the spiral line of the screw cap (11).

7. A bone screw according to claim 6, wherein: the screw body (1) is a titanium alloy screw.

8. A bone screw as claimed in claim 7, wherein: the size of the thread clearance (12d) is 3mm to 4 mm.