CN109464183B

CN109464183B - Orthopedic implant screw

Info

Publication number: CN109464183B
Application number: CN201811551062.6A
Authority: CN
Inventors: 王彩梅
Original assignee: Tianyan Medical Equipment Co ltd
Current assignee: Tianyan Medical Equipment Co ltd
Priority date: 2018-12-18
Filing date: 2018-12-18
Publication date: 2024-04-30
Anticipated expiration: 2038-12-18
Also published as: CN109464183A

Abstract

The invention provides an orthopedic implant screw, which comprises an outer screw, wherein the surface of the outer screw is provided with a first thread structure, the outer screw is drilled into a bone in a rotating mode through the first thread structure, the end face of the first end of the outer screw is provided with a mounting hole, the hole wall surface of the mounting hole is provided with a thread groove, and the thread groove penetrates through the outer screw; the inner screw is detachably arranged in the mounting hole, the surface of the inner screw is provided with a second thread structure matched with the thread groove, the second thread structure is arranged after passing through the thread groove, the inner screw is installed into the mounting hole in a rotating mode through the second thread structure and is connected with bones, and the rotation direction of the second thread structure is opposite to that of the first thread structure. The invention solves the problems that the bone nails in the prior art are easy to loosen and even unscrew from bones in a complex stress environment for a long time, thereby being not only unfavorable for the rapid and stable growth and healing of the bones, but also causing secondary injury to affected parts and seriously affecting the life quality of patients.

Description

Orthopedic implant screw

Technical Field

The invention relates to the technical field of medical instruments, in particular to a structural design of a spin-resistant orthopedic implant screw.

Background

The bone nail is used as an orthopedic implant commonly used for fixation, is commonly used for fixation of internal fracture or dislocation, and can be directly screwed into two different bone blocks or fixed bone plates and other implants to realize fixation of bones and promote healing of affected parts when in use.

However, in clinic, the screw implanted into the bone is in a complex stress environment for a long time, and is easy to loosen, and even gradually jogged out of the bone, so that the bone is not beneficial to rapid and stable growth and healing, secondary injury of an affected part is likely to be caused, and the life quality of a patient is seriously influenced.

Disclosure of Invention

The invention mainly aims to provide an orthopedic implant screw, which solves the problems that in the prior art, a bone screw for implanting into bones is easy to loosen and even gradually jogged out from the bones in a complex stress environment for a long time, so that the bone is not beneficial to the rapid and stable growth and healing of the bones, secondary injury to affected parts is likely to be caused, and the life quality of patients is seriously affected.

In order to achieve the above object, the present invention provides an orthopedic implant screw for implanting into bone, comprising: the surface of the outer screw is provided with a first thread structure, the outer screw drills into a bone in a rotary mode through the first thread structure, the end face of the first end of the outer screw is provided with a mounting hole extending along the axial direction of the outer screw, the wall surface of the mounting hole is provided with a thread groove, the thread groove extends along the axial direction of the mounting hole, and at least a part of the thread groove penetrates through the outer screw in the radial direction of the mounting hole; the inner screw is detachably arranged in the mounting hole, the surface of the inner screw is provided with a second thread structure matched with the thread groove, the second thread structure penetrates through the thread groove and then protrudes out of the surface of the outer screw, the inner screw is installed into the mounting hole in a rotating mode through the second thread structure and is connected with the bone, and the rotation direction of the second thread structure is opposite to that of the first thread structure so as to prevent the outer screw from exiting the bone.

Further, the lead angle B of the lead of the second thread structure is greater than the lead angle a of the lead of the first thread structure.

Further, the ratio of the thread lead angle B to the thread lead angle A is more than or equal to 2 and less than or equal to 3.

Further, the thread lead angle a is between 10 ° and 30 °.

Further, the radial length of the second thread structure at a portion protruding from the surface of the outer screw is 2mm or more.

Further, the second thread structure is coiled up around the outer circumference of the inner screw for a number of turns of 1 or more and 3 or less.

Further, the outer screw comprises a nail tip, a nail body and a nail cap which are sequentially connected, wherein the mounting hole is formed in the nail cap, the direction from the nail cap to the nail tip of the nail body comprises a slotted section and a thread section, the thread groove is formed in the nail cap and the slotted section, and the thread groove on the slotted section penetrates through the outer screw in the radial direction of the mounting hole; the first thread formation is located on the thread segments.

Further, the outside diameter of the grooved section is greater than the outside diameter of the threaded section, and the diameter of the grooved section is greater than or equal to the outside diameter of the first threaded structure.

Further, the axial length of the first thread structure, the axial length of the thread groove, and the axial length of the second thread structure are all equal.

Further, the hole section of the mounting hole at the end face near the first end of the outer screw is polygonal to form a screwing operation hole section; the top end surface of the inner screw is provided with an operation hole, and the hole section of the operation hole is polygonal.

By adopting the technical scheme, the external screw is arranged and is drilled into the bone in a rotating way through the first thread structure, so that the normal use of the bone implantation screw is realized, the internal screw is arranged in the mounting hole of the external screw and is drilled into the bone through the second thread structure which is connected with the external screw and penetrates out of the thread groove of the external screw, and the rotation direction of the second thread structure is opposite to that of the first thread structure, so that when the external screw has a trend of rotating out of the bone, the external screw is limited and blocked by the internal screw and the second thread structure, further movement of the external screw is effectively prevented, the stability of the external screw implanted into the bone is ensured, the bone can be quickly and stably grown and healed, the affected part is prevented from being secondarily injured, and the living quality of a patient is reliably improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

FIG. 1 shows a schematic front view of an orthopedic implant screw according to an alternative embodiment of the present invention;

FIG. 2 shows a schematic front cross-sectional view of the orthopedic implant screw of FIG. 1;

FIG. 3 shows a schematic top view of the orthopedic implant screw of FIG. 1;

fig. 4 shows a schematic front view of an external screw of the orthopedic implant screw of fig. 1;

FIG. 5 shows a schematic front cross-sectional view of the outer screw of FIG. 4;

FIG. 6 shows a schematic top view of the outer screw of FIG. 4;

FIG. 7 shows a schematic front view of an internal screw of the orthopedic implant screw of FIG. 1;

FIG. 8 shows a schematic cross-sectional view of the inner screw of FIG. 7 at O-O;

fig. 9 shows a schematic top view of the inner screw of fig. 7.

Wherein the above figures include the following reference numerals:

10. An outer screw; 100. a first thread structure; 11. a mounting hole; 111. screwing the operation hole section; 12. a thread groove; 13. a spike; 14. nailing the body; 141. a slotted section; 142. a threaded section; 15. a nail cap; 20. an inner screw; 200. a second thread structure; 21. an operation hole.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In order to solve the problems that in the prior art, a bone nail for implanting bones is in a complex stress environment for a long time, looseness is easy to occur, and even the bone nail is gradually and slightly screwed out of the bones, so that the bone is not beneficial to rapid and stable growth and healing, secondary injury to affected parts is likely to be caused, and the life quality of patients is seriously affected.

As shown in fig. 1 to 9, the orthopedic implant screw for implanting into bone comprises an outer screw 10 and an inner screw 20, wherein the surface of the outer screw 10 is provided with a first thread structure 100, the outer screw 10 is rotationally drilled into the bone through the first thread structure 100, the end surface of the first end of the outer screw 10 is provided with a mounting hole 11 extending along the axial direction of the outer screw 10, the wall surface of the mounting hole 11 is provided with a thread groove 12, the thread groove 12 extends along the axial direction of the mounting hole 11, and at least a part of the thread groove 12 penetrates through the outer screw 10 in the radial direction of the mounting hole 11; the inner screw 20 is detachably disposed in the mounting hole 11, the surface of the inner screw 20 has a second screw thread structure 200 adapted to the screw thread groove 12, and the second screw thread structure 200 protrudes out of the surface of the outer screw 10 after passing through the screw thread groove 12, and the inner screw 20 is rotatably mounted into the mounting hole 11 through the second screw thread structure 200 and connected with the bone, wherein the rotation direction of the second screw thread structure 200 is opposite to the rotation direction of the first screw thread structure 100 to prevent the outer screw 10 from backing out of the bone.

Through setting up outer screw 10, outer screw 10 is bored into the skeleton with rotatory mode through first screw thread structure 100, so as to realize the normal use of orthopedics implantation screw, through the mounting hole 11 at outer screw 10 is equipped with interior screw 20, interior screw 20 is through being connected with it and the second screw thread structure 200 that wears out by the screw groove 12 of outer screw 10 bore into the skeleton, because the direction of rotation of second screw thread structure 200 is opposite to the direction of rotation of first screw thread structure 100, when outer screw 10 has the trend of rotatory withdrawal skeleton, can receive the spacing of interior screw 20 and second screw thread structure 200 to prevent further motion of outer screw 10 effectively, ensured the steadiness of outer screw 10 implantation skeleton, not only be favorable to the quick, the steady growth healing of skeleton, and avoided the affected part to receive the secondary injury, the quality of life of patient has reliably been improved.

As shown in fig. 4 and 7, the lead angle B of the second thread structure 200 is greater than the lead angle a of the first thread structure 100. This is considering that the screw lead angle a of the first screw structure 100 is smaller, the external screw 10 needs to rotate more circles to drill into the bone completely, the stable connection between the external screw 10 and the bone is ensured, the screw lead angle B of the second screw structure 200 needs to be set larger, so that the internal screw 20 can enter the mounting hole 11 only by screwing fewer circles, and is connected with the bone, the limiting effect of the external screw 10 is achieved, the internal screw 20 and the external screw 10 are assembled conveniently, and the use convenience of the orthopedic implant screw is improved.

Specifically, alternatively, the ratio of the thread lead angle B to the thread lead angle a is 2 or more and 3 or less. The second thread structure 200 and the first thread structure 100 with the ratio of the thread lead angle B to the thread lead angle A within the range are reasonable in structure, the second thread structure 200 and the inner screw 20 are convenient to integrally form and manufacture, the first thread structure 100 and the outer screw 10 are also convenient to integrally form and manufacture, and the structural rationality of the orthopedic implant screw is improved.

Optionally, the thread lead angle a is between 10 ° and 30 °. Accordingly, the thread lead angle B is between 20 ° and 90 °.

Alternatively, the radial length of the second screw structure 200 at the portion protruding from the surface of the outer screw 10 is 2mm or more. The second thread structure 200 of this parameter can be effectively coupled to bone to prevent the external screw 10 from rotating out of the bone while avoiding excessive damage to the bone.

Optionally, the number of turns of the second thread structure 200 raised around the outer Zhou Pan of the inner screw 20 is 1 or more and 3 or less. In this way, the corresponding number of turns of the inner screw 20 can be screwed, so that the assembly of the inner screw 20 and the outer screw 10 can be conveniently realized, and the outer screw 10 is reliably limited.

As shown in fig. 1,2, 4 and 5, the outer screw 10 comprises a nail tip 13, a nail body 14 and a nail cap 15 which are sequentially connected, wherein a mounting hole 11 is formed in the nail cap 15, the direction from the nail cap 15 to the nail tip 13 of the nail body 14 comprises a slotted section 141 and a thread section 142, wherein a thread groove 12 is formed in the nail cap 15 and the slotted section 141, and the thread groove 12 formed in the slotted section 141 penetrates through the outer screw 10 in the radial direction of the mounting hole 11; the first thread form 100 is located on the thread segments 142. Thus, while the internal screw 20 is screwed into the mounting hole 11, the second screw structure 200 is fed along the screw groove 12, and a portion of the second screw structure 200 protrudes from the screw groove 12 to be coupled with the bone.

As shown in fig. 1,2, 4 and 5, the outer diameter of the grooved section 141 is larger than the outer diameter of the threaded section 142, and the diameter of the grooved section 141 is larger than or equal to the outer diameter of the first threaded structure 100. The external screw 10 with the structure is more beneficial to drilling into bones, and has smaller wound surface to the bones and high practicability.

Optionally, the axial length of the first thread structure 100, the axial length of the thread groove 12, and the axial length of the second thread structure 200 are all equal. In this way, the orthopedic implant screw has a more compact structure when the inner screw 20 is completely rotated into the mounting hole 11 to complete the assembly with the outer screw 10.

As shown in fig. 3, 6 and 8, the hole section of the mounting hole 11 at the end face near the first end of the outer screw 10 is polygonal to form a screwing operation hole section 111; an operation hole 21 is formed in the tip end surface of the inner screw 20, and the hole section of the operation hole 21 is polygonal. This is to facilitate the screwing operation of the external screw 10 and the internal screw 20, and to improve the convenience of use of the orthopedic implant screw.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

Spatially relative terms, such as "above … …," "above … …," "upper surface on … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An orthopedic implant screw for implanting into bone, comprising:

The external screw (10), the surface of external screw (10) is provided with first screw thread structure (100), external screw (10) are through first screw thread structure (100) are bored in the skeleton with rotatory mode, mounting hole (11) along the axial extension of external screw (10) are seted up to the terminal surface of the first end of external screw (10), threaded groove (12) are seted up to the pore wall of mounting hole (11), threaded groove (12) are along the axial extension of mounting hole (11), and at least a portion of threaded groove (12) are in radial link up of mounting hole (11) external screw (10);

An inner screw (20), wherein the inner screw (20) is detachably arranged in the mounting hole (11), the surface of the inner screw (20) is provided with a second thread structure (200) matched with the thread groove (12), the second thread structure (200) protrudes out of the surface of the outer screw (10) after passing through the thread groove (12), the inner screw (20) is rotatably arranged into the mounting hole (11) through the second thread structure (200) and is connected with the bone, and the rotation direction of the second thread structure (200) is opposite to the rotation direction of the first thread structure (100) so as to prevent the outer screw (10) from exiting the bone;

the thread lead angle B of the second thread structure (200) is larger than the thread lead angle A of the first thread structure (100);

the ratio of the screw thread helix angle B to the screw thread helix angle A is more than or equal to 2 and less than or equal to 3;

The radial length of the second thread structure (200) at a portion protruding from the surface of the outer screw (10) is 2mm or more.

2. The orthopedic implant screw of claim 1 wherein said screw lead angle a is between 10 ° and 30 °.

3. The orthopedic implant screw of claim 1, characterized in that the number of turns of the second thread structure (200) rising around the outer Zhou Pan of the inner screw (20) is greater than or equal to 1 and less than or equal to 3.

4. The orthopedic implant screw of claim 1, characterized in that the external screw (10) comprises a spike (13), a shank (14) and a nut (15) connected in sequence, wherein the mounting hole (11) is opened on the nut (15), the direction of the shank (14) from the nut (15) to the spike (13) comprises a slotted section (141) and a threaded section (142), wherein the threaded slot (12) is positioned on the nut (15) and the slotted section (141), and the threaded slot (12) positioned on the slotted section (141) penetrates through the external screw (10) in the radial direction of the mounting hole (11); the first thread structure (100) is located on the thread segment (142).

5. The orthopedic implant screw of claim 4, characterized in that an outer diameter of the grooved section (141) is larger than an outer diameter of the threaded section (142), and a diameter of the grooved section (141) is larger than or equal to an outer diameter of the first threaded structure (100).

6. The orthopedic implant screw of claim 4, characterized in that the axial length of the first thread structure (100), the axial length of the thread groove (12) and the axial length of the second thread structure (200) are all equal.

7. The orthopedic implant screw of claim 1, characterized in that a hole cross section of the mounting hole (11) at an end face near the first end of the external screw (10) is polygonal to form a screwing operation hole section (111); an operation hole (21) is formed in the top end surface of the inner screw (20), and the hole section of the operation hole (21) is polygonal.