CN211023037U

CN211023037U - Intramedullary nail

Info

Publication number: CN211023037U
Application number: CN201921248594.2U
Authority: CN
Inventors: 贺鹏; 余鹤; 丁建忠
Original assignee: JIANGSU BAIDE MEDICAL INSTRUMENT CO Ltd
Current assignee: JIANGSU BAIDE MEDICAL INSTRUMENT CO Ltd
Priority date: 2019-08-02
Filing date: 2019-08-02
Publication date: 2020-07-17
Anticipated expiration: 2029-08-02

Abstract

The utility model particularly relates to an intramedullary nail, including intramedullary nail main part, lag screw and set screw, the intramedullary nail main part includes rectangular cylindric nail pole and sets up the cap that seals at the afterbody, and the front end outer wall of nail pole is provided with along axial evenly distributed's a plurality of rectangular grooves, and the front portion of nail pole is provided with the preceding transverse through hole with set screw matched with, and the afterbody of nail pole is provided with the back transverse through hole with lag screw matched with, still including the lock screw that is used for fixed lag screw, and lock screw passes the nail pole setting on lag screw. The intramedullary nail of the utility model effectively avoids the phenomenon that the tension screw retreats from the nail by setting the locking screw.

Description

Intramedullary nail

Technical Field

The utility model relates to an intramedullary nail.

Background

Intramedullary nails are typically composed of a combination of an intramedullary nail body, lag screws and set screws.

Intramedullary nails may be used to locate and fix fractures of long bones, such as the femur. In a fractured femur, the intramedullary nail body may be inserted into the intramedullary canal of the femur and placed to extend along the fracture line of the femur. Fixation screws or other fixation devices may then be inserted through holes formed in the intramedullary nail body on opposite sides of the fractured femur to ensure that the opposite sections of the fractured femur are secured together. When the intramedullary nail is used, the axial and circumferential locking is realized through the fixing screw.

If the head and/or neck of a long bone, for example the head and/or neck of a femur, has been fractured, a lag screw may be inserted into a transverse bore (transverse bore) formed in the body of the intramedullary nail. The hole is arranged such that the lag screw extends through the neck of the long bone to the head of the long bone and through the fracture line, which enables the lag screw to reduce fracture of the head and/or neck of the long bone.

The utility model with publication number of CN 203885598U specifically discloses a gamma intramedullary nail, which is formed by combining an intramedullary nail main body, a lag screw and a fixing screw, wherein the intramedullary nail main body is composed of a long cylindrical nail rod and a tail cap arranged at the tail part, the outer wall of the front end of the nail rod is provided with a plurality of long grooves which are uniformly distributed along the axial direction, the front part of the nail rod is provided with a front transverse through hole matched with the fixing screw, and the tail part of the nail rod is provided with a rear transverse through hole matched with the lag screw; the lag screw consists of a spiral tool bit, a connecting bolt, an anti-rotation sleeve and an anti-rotation nut. Although the lag screw of the gamma intramedullary nail can realize self-locking, thereby preventing the loosening phenomenon from occurring when in use, the lag screw still has the nail withdrawing phenomenon when in use as a whole, and the nail withdrawing phenomenon is easier to occur particularly in osteoporosis patients.

Disclosure of Invention

The utility model aims to solve the technical problem that the prior art is not enough to be overcome, and provides an intramedullary nail, through setting up locking screw, effectively stops the lag screw and moves back the appearance of nail phenomenon.

For solving the above technical problem, the utility model discloses a technical scheme who takes is:

the utility model provides an intramedullary nail, including intramedullary nail main part, lag screw and set screw, the intramedullary nail main part includes rectangular cylindric nail pole and sets up the sealing cap at the afterbody, the front end outer wall of nail pole is provided with along axial evenly distributed's a plurality of rectangular grooves, the front portion of nail pole is provided with the preceding transverse through hole with set screw matched with, the afterbody of nail pole is provided with the back transverse through hole with lag screw matched with, still including the lock screw that is used for fixed lag screw, lock screw passes the setting of nail pole on lag screw.

Preferably, the central axis of the locking screw is non-parallel to the central axis of the lag screw.

Further preferably, the central axis of the locking screw is perpendicular to the central axis of the lag screw.

Preferably, the lag screw comprises a spiral cutter head, a tail cap and a connecting screw, one end of the spiral cutter head is connected with one end of the tail cap, a cavity is formed in the tail cap, an internal thread is arranged at one end of the spiral cutter head, an external thread is arranged on the connecting screw, and the connecting screw is arranged in the cavity of the tail cap and is in threaded connection with the spiral cutter head.

Further preferably, the nail rod is provided with a through hole, the through hole and the rear transverse through hole are arranged in a crossed and penetrating mode, the tail cap is arranged in the rear transverse through hole in a penetrating mode, and the locking screw penetrates through the through hole and is arranged on the tail cap.

Preferably, the central axis of the locking screw is perpendicular to the central axis of the tail cap.

Preferably, the fracture fixation screw further comprises a positioning mechanism, wherein the positioning mechanism comprises a positioning hole and a positioning rope, the positioning hole is formed in the screw rod, and the positioning rope penetrates through the positioning hole to fix the fracture block and the screw rod.

Further preferably, the positioning hole is plural.

Preferably, the positioning holes comprise a rear positioning hole and a front positioning hole, the rear positioning hole is positioned between the tail part of the nail rod and the rear transverse through hole, the front positioning hole is positioned in front of the rear transverse through hole on the nail rod, and the front positioning hole is positioned in the projection range of the locking screw in the direction of the nail rod.

Preferably, the locking screw is provided with an external thread.

Due to the adoption of the technical scheme, compared with the prior art, the utility model have the following advantage:

1. the utility model effectively avoids the phenomenon that the tension screw moves back the screw by arranging the locking screw;

2. the utility model discloses set up positioning mechanism, effectively reset fracture piece.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic structural diagram of the present invention;

wherein: 1. an intramedullary nail main body; 11. a nail rod; 12. sealing the cap; 13. a front transverse through hole; 14. a rear transverse through hole; 15. a through hole; 2. a lag screw; 21. a helical cutter head; 22. a tail cap; 23. a connecting screw; 3. a set screw; 4. a locking screw; 5. positioning holes; 51. a front positioning hole; 52. a rear positioning hole; 6. positioning the rope; 7. and (4) locking buckles.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples.

Referring to fig. 1 to 3, the intramedullary nail of the present invention includes an intramedullary nail body 1, a lag screw 2 and a fixing screw 3 (not shown).

The intramedullary nail body 1 comprises a long cylindrical nail rod 11 and a sealing cap 12 arranged at the tail part of the nail rod 11, and the nail rod 11 and the sealing cap 12 are connected through threads. The outer wall of the front end of the nail rod 11 is provided with a plurality of strip grooves which are evenly distributed along the axial direction, the front part of the nail rod 11 is provided with a front transverse through hole 13 matched with the fixing screw 3, the tail part of the nail rod 11 is provided with a rear transverse through hole 14 matched with the tension screw 2, the outer wall of the front end of the nail rod 11 further comprises a locking screw 4 used for fixing the tension screw 2, and the locking screw 4 penetrates through the nail rod 11 and is arranged on the tension screw 2.

In the present embodiment, the lag screw 2 includes a screw bit 21, a tail cap 22, and a connection screw 23. The outer wall of the front part of the spiral tool bit 21 is a spiral body, the rear part of the spiral tool bit is of a cylindrical structure, internal threads are arranged on the inner wall of the rear part of the spiral tool bit, a clamping groove is formed in the tail part of the spiral tool bit 21, a clamping block matched with the clamping groove is arranged on the front part of the tail cap 22, and the tail part of the spiral tool bit 21 is clamped with the front part of the tail cap. A cavity is formed in the tail cap 22, external threads matched with the internal threads at the rear part of the spiral tool bit 21 are arranged at the front part of the connecting screw 23, an inner hexagonal groove is formed in the rear end face of the connecting screw 23, and the connecting screw 23 is arranged in the cavity of the tail cap 22 and is in threaded connection with the spiral tool bit 21.

In this embodiment, the nail rod 11 is provided with a through hole 15, the through hole 15 and the rear transverse through hole 14 are arranged in a crossing and penetrating manner, the tail cap 22 is further provided with a through hole in the same direction as the through hole 15, and when the tail cap 22 is arranged in the rear transverse through hole 14 in a penetrating manner, the through hole 15 is communicated with the through hole. The locking screw 4 comprises a screw body positioned at the front part and a screw cap positioned at the rear part, wherein the screw body is provided with an external thread, and the rear end face of the screw cap is provided with an inner hexagonal groove. The front part of the nail body of the locking screw 4 penetrates through one end of the through hole 15 on the nail rod 11, passes through the pair of through holes on the tail cap 22, penetrates out from the other end of the through hole 15 and continues to extend, and the nail cap of the locking screw 4 is arranged on the tail cap 22. The head of the locking screw 4 can here be arranged both on the inner wall of the tail cap 22 near the front of the shank and on the outer wall of the tail cap 22 remote from the front of the shank, the head of the locking screw 4 being arranged on the inner wall of the tail cap 22 near the front of the shank for a more secure locking effect.

In the present embodiment, the central axis of the locking screw 4 is perpendicular to the central axis of the tail cap 22, and other non-parallel structures are also possible, wherein the perpendicular arrangement of the locking lag screw 2 is most effective.

In this embodiment, the fracture fixation screw further comprises a positioning mechanism, the positioning mechanism comprises a positioning hole 5 and a positioning rope 6, the positioning hole 5 is formed in the screw rod 11, and the positioning rope 6 penetrates through the positioning hole 5 to fix the fracture block and the screw rod. The plurality of positioning holes 5 comprise a front positioning hole 51 and a rear positioning hole 52, the rear positioning hole 52 is positioned between the tail part of the nail rod 11 and the rear transverse through hole 14, the front positioning hole 51 is positioned in front of the rear transverse through hole 14 on the nail rod 11, and the front positioning hole 51 is positioned in the projection range of the locking screw 4 in the direction of the nail rod 11. In the present embodiment, the number of the front positioning holes 51 is 1, and the number of the rear positioning holes 52 is 3.

In this embodiment, the positioning rope 6 may be made of a titanium cable, or may be made of other materials. The positioning rope 6 can bind the fracture block at the greater trochanter part to effectively reduce the fracture block.

In this embodiment, the positioning rope 6 is further provided with a locking buckle 7, which facilitates locking and unlocking of the positioning rope 6. The locking buckle 7 is provided as a locking structure which is common in the art.

The above description of the present invention is provided to help understand the method and the core idea of the present invention, and the purpose of the present invention is to allow people familiar with the art to understand the contents of the present invention and to implement the method, and thus the protection scope of the present invention cannot be limited by the above description. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. The utility model provides an intramedullary nail, includes intramedullary nail main part, lag screw and set screw, the intramedullary nail main part includes rectangular cylindric nail pole and sets up the sealing cap at the afterbody, and the front end outer wall of nail pole is provided with along axial evenly distributed's a plurality of rectangular grooves, and the front portion of nail pole is provided with the preceding transverse through hole with set screw matched with, and the afterbody of nail pole is provided with the rear transverse through hole with lag screw matched with, its characterized in that: the locking screw is used for fixing the lag screw and penetrates through the screw rod to be arranged on the lag screw.

2. The intramedullary nail of claim 1, wherein: the central axis of the locking screw is not parallel to the central axis of the lag screw.

3. The intramedullary nail of claim 2, wherein: the central axis of the locking screw is perpendicular to the central axis of the lag screw.

4. The intramedullary nail of claim 1, wherein: the lag screw comprises a spiral tool bit, a tail cap and a connecting screw, one end of the spiral tool bit is connected with one end of the tail cap, a cavity is formed in the tail cap, an internal thread is arranged at one end of the spiral tool bit, the connecting screw is provided with an external thread, and the connecting screw is arranged in the cavity of the tail cap and is in threaded connection with the spiral tool bit.

5. The intramedullary nail of claim 4, wherein: the nail rod is provided with a through hole, the through hole and the rear transverse through hole are arranged in a crossed mode in a penetrating mode, the tail cap is arranged in the rear transverse through hole in a penetrating mode, and the locking screw penetrates through the through hole and is arranged on the tail cap.

6. The intramedullary nail of claim 4, wherein: the central axis of the locking screw is perpendicular to the central axis of the tail cap.

7. The intramedullary nail of claim 1, wherein: the fracture fixation nail is characterized by further comprising a positioning mechanism, wherein the positioning mechanism comprises a positioning hole and a positioning rope, the positioning hole is formed in the nail rod, and the positioning rope penetrates through the positioning hole to fix the fracture block and the nail rod.

8. The intramedullary nail of claim 7, wherein: the locating hole is a plurality of.

9. The intramedullary nail of claim 7, wherein: the positioning holes comprise a rear positioning hole and a front positioning hole, the rear positioning hole is positioned between the tail part and the rear transverse through hole on the nail rod, the front positioning hole is positioned in front of the rear transverse through hole on the nail rod, and the front positioning hole is positioned in the projection range of the locking screw in the direction of the nail rod.

10. The intramedullary nail of claim 1, wherein: and the locking screw is provided with an external thread.