CN216908089U

CN216908089U - Anti-drop intramedullary nail

Info

Publication number: CN216908089U
Application number: CN202123229843.3U
Authority: CN
Inventors: 钱建清
Original assignee: Jiangsu Shuangyang Medical Instrument Co ltd
Current assignee: Jiangsu Shuangyang Medical Instrument Co ltd
Priority date: 2021-12-21
Filing date: 2021-12-21
Publication date: 2022-07-08
Anticipated expiration: 2031-12-21

Abstract

The application discloses anticreep intramedullary nail, including pin fin portion, nail body portion and nail afterbody, the pin fin portion is equipped with the screw hole, and threaded hole is equipped with screw, its characterized in that: the concave recess that communicates with the screw hole that is equipped with in pin fin portion top is equipped with the internal thread on the inner wall of recess, be equipped with in the recess with internal thread threaded connection's screw thread post, the concave jack that is equipped with in bottom of screw thread post, it has the gag lever post to peg graft in the jack, the top of gag lever post and the top of jack are fixed with the spring, are equipped with cooperation gag lever post male spacing through-hole on the screw. This anticreep intramedullary nail passes through the structural cooperation, and when the screw inserted the threaded hole, rotatory screw thread post, gag lever post receive spring force and screw butt, and the screw continues at the screw hole internal rotation, and spacing through-hole is close to spacing gag lever post along with the screw rotation, and when the screw arrived the assigned position, spacing gag lever post just inserted in the spacing through-hole, and the restriction screw rotates, prevents that the screw is not hard up to drop, and is more stable, avoids the potential safety hazard.

Description

Anti-drop intramedullary nail

Technical Field

The application relates to the field of medical instruments, in particular to an anti-dropping intramedullary nail.

Background

In recent years, gamma-type intramedullary nails are commonly used clinically to treat the fracture. The gamma intramedullary nail has little influence on the fracture end, adopts intramedullary fixation, ensures that the fixed axis is close to the axis of the femur, bears the minimum tensile stress and compressive stress, has the minimum stress shielding of the fracture end, can realize pressurization and has a plurality of advantages. However, in most of the existing intramedullary nails, due to design defects, screws are loosened after long-term use and are seriously separated from the femur, so that potential safety hazards exist.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an anti-drop intramedullary nail to overcome the defects in the prior art.

In order to achieve the purpose, the utility model provides the following technical scheme:

the embodiment of the application discloses anticreep intramedullary nail, including pin fin portion, nail body portion and nail afterbody, the pin fin portion is equipped with the screw hole, threaded hole is equipped with screw, its characterized in that: the novel nail head structure is characterized in that a groove communicated with the threaded hole is concavely formed in the top end of the nail head portion, an internal thread is arranged on the inner wall of the groove, a threaded column in threaded connection with the internal thread is arranged in the groove, an insertion hole is concavely formed in the bottom of the threaded column, a limiting rod is inserted in the insertion hole, springs are fixed to the top end of the limiting rod and the top end of the insertion hole, and a limiting through hole matched with the limiting rod is formed in the screw.

Preferably, in the above anti-drop intramedullary nail, the length of the spring in an unstressed state is smaller than the depth of the insertion hole.

Preferably, in the above anti-drop intramedullary nail, the cross section of the insertion hole is rectangular.

Preferably, in the above anti-dropping intramedullary nail, the inner walls of the periphery of the insertion hole are all concavely provided with vertical grooves, and the periphery of the limiting rod is convexly provided with sliding blocks matched with the vertical grooves.

Preferably, in the above anti-drop intramedullary nail, a connecting groove with a hexagonal cross section is concavely arranged at the top end of the threaded column.

Compared with the prior art, the utility model has the advantages that:

this anticreep intramedullary nail passes through the structure cooperation, and when the screw inserted the threaded hole, rotatory screw thread post, gag lever post received spring force and screw butt, and the screw continues at the screw hole internal rotation, and spacing through-hole is close to spacing gag lever post along with the screw rotates, and when the screw arrived the assigned position, spacing gag lever post just inserted in spacing through-hole, and the restriction screw rotates, prevents that the screw is not hard up to drop, and is more stable, avoids the potential safety hazard.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a schematic structural view of the anti-slip intramedullary nail according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described in detail below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Referring to fig. 1, the anti-drop intramedullary nail in the embodiment includes a nail head portion 1, a nail body portion 2 and a nail tail portion 3, the nail head portion 1 is provided with a threaded hole 4, a screw 5 is arranged in the threaded hole 4, a groove 6 communicated with the threaded hole 4 is concavely arranged at the top end of the nail head portion 1, an internal thread 7 is arranged on the inner wall of the groove 6, a threaded column 8 in threaded connection with the internal thread 7 is arranged in the groove 6, a jack 9 is concavely arranged at the bottom of the threaded column 8, a limiting rod 10 is inserted in the jack 9, a spring 11 is fixed at the top end of the limiting rod 10 and the top end of the jack 9, and a limiting through hole 12 matched with the limiting rod for insertion is arranged on the screw 5.

Further, the length of the spring 11 in an unstressed state is smaller than the depth of the insertion hole 9.

Further, the cross section of the insertion hole 9 is rectangular.

Furthermore, vertical grooves 13 are concavely arranged on the inner walls of the periphery of the insertion hole 9, and sliding blocks 14 matched with the vertical grooves 13 are convexly arranged on the periphery of the limiting rod 10.

Furthermore, the top end of the threaded column 8 is concavely provided with a connecting groove 801 with a hexagonal cross section, so that the threaded column is convenient to be connected with a tool for forward and reverse rotation.

In this technical scheme, this anticreep intramedullary nail passes through the structure cooperation, and when the screw inserted the threaded hole, rotatory screw thread post, gag lever post received spring force and screw butt, and the screw continues at the screw hole internal rotation, and spacing through-hole is close to spacing gag lever post along with the screw rotates, and when the screw arrived the assigned position, spacing gag lever post just inserted in the spacing through-hole, and the restriction screw rotates, prevents that the screw is not hard up to drop, and is more stable, avoids the potential safety hazard.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing is merely a detailed description of the present application, and it should be noted that modifications and embellishments could be made by those skilled in the art without departing from the principle of the present application, and these should also be considered as the protection scope of the present application.

Claims

1. The utility model provides an anticreep intramedullary nail, includes pin fin portion, nail body portion and nail afterbody, the pin fin portion is equipped with the screw hole, threaded hole is equipped with screw, its characterized in that: the novel nail head structure is characterized in that a groove communicated with the threaded hole is concavely formed in the top end of the nail head portion, an internal thread is arranged on the inner wall of the groove, a threaded column in threaded connection with the internal thread is arranged in the groove, an insertion hole is concavely formed in the bottom of the threaded column, a limiting rod is inserted in the insertion hole, springs are fixed to the top end of the limiting rod and the top end of the insertion hole, and a limiting through hole matched with the limiting rod is formed in the screw.

2. The anti-drop intramedullary nail of claim 1, wherein: the length of the spring in an unstressed state is smaller than the depth of the jack.

3. The anti-drop intramedullary nail of claim 1, wherein: the cross section of the jack is rectangular.

4. The anti-drop intramedullary nail of claim 1, wherein: the inner wall all around of jack all is equipped with the perpendicular groove of concave, the protruding slider that is equipped with the cooperation perpendicular groove all around of gag lever post.

5. The anti-drop intramedullary nail of claim 1, wherein: the top end of the threaded column is concavely provided with a connecting groove with a hexagonal section.