Ulnar intramedullary nail

Abstract

The utility model discloses an ulnar intramedullary nail, comprising a first nail body, a third nail body is installed on the top of the first nail body, four first receiving grooves are opened on the outer surface of the third nail body, a supporting elastic rod is installed inside the first receiving groove, a limited movable cavity is opened inside the third nail body, a second nail body is movably installed inside the limited movable cavity, the first nail body is fixedly installed in an integrated manner below the second nail body, a second accommodating groove corresponding to the first receiving groove is opened on the outer surface of the first nail body, a limited sliding groove is opened on the inner wall of the limited movable cavity, a limited sliding block is movably installed inside the limited sliding groove; an adjusting threaded hole is opened inside the second nail body. The ulnar intramedullary nail, by setting a third nail body with adjustable position, pushes the supporting elastic rod to deform into an arc shape, presses against the inner wall of the marrow cavity, supports the bone, aligns the broken bone, and is conducive to the recovery of the broken bone.

Description

Technical Field

[0001] The utility model relates to the technical field of intramedullary nails, in particular to an ulnar intramedullary nail. Background Art

[0002] Ulnar intramedullary nailing is a commonly used orthopedic internal fixation method, widely used in the treatment of long bone fractures, nonunion, etc. This technology achieves the purpose of fixing the fracture end by implanting a biocompatible and strong implant into the medullary cavity of the ulna.

[0003] China Authorization Announcement No. CN215018760U discloses an ulnar intramedullary nail, which includes a fixed end, a main body and a tip from top to bottom, the tip is a three-dimensional hexagonal plum blossom shape, the main body is provided with a locking hole near the fixed end, the fixed end is an arc structure, and the end of the fixed end is provided with a fixed slot; a locking nail is inserted into the locking hole; the main body is a solid cylindrical structure or a solid plum blossom structure in cross section; the length of the main body is 234-274mm, and the diameter is 3.1-5.3mm. The tip of the ulnar intramedullary nail of the utility model is designed as a hexagonal plum blossom structure, and the main body is provided with a circular locking hole near the fixed end, which can achieve a strong fracture fixation effect and ulnar stability control effect.

[0004] In order to facilitate insertion into the ulnar medullary cavity, the thickness of the existing ulnar intramedullary nail is smaller than the internal size of the ulnar medullary cavity, which leads to a lack of support at the broken bone and may still be in a dislocated state, affecting the recovery effect of the ulna. Therefore, we propose an ulnar intramedullary nail. Utility Model Content

[0005] The purpose of the utility model is to provide an ulnar intramedullary nail to solve the problem in the above background technology that the thickness of the existing ulnar intramedullary nail is smaller than the internal size of the ulnar medullary cavity in order to facilitate insertion into the interior of the ulnar medullary cavity, which leads to a lack of support at the broken bone and may still be in a dislocated state, thus affecting the recovery effect of the ulna.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an ulnar intramedullary nail, comprising a first nail body, a third nail body is installed on the upper part of the first nail body, four first receiving grooves are provided on the outer surface of the third nail body, a supporting elastic rod is installed inside the first receiving groove, a limited movable cavity is provided inside the third nail body, a second nail body is movably installed inside the limited movable cavity, the first nail body is fixedly installed in an integrated manner below the second nail body, a second receiving groove corresponding to the first receiving groove is provided on the outer surface of the first nail body, a limited sliding groove is provided on the inner wall of the limited movable cavity, and a limited sliding block is movably installed inside the limited sliding groove;

[0007] An adjusting threaded hole is provided inside the second nail body, an adjusting threaded rod is installed on the internal thread of the adjusting threaded hole, and a baffle is fixedly installed above the outer surface of the adjusting threaded rod.

[0008] Preferably, the diameter of the second nail body matches the diameter of the interior of the position-limiting activity cavity, and the second nail body is movable inside the position-limiting activity cavity.

[0009] Preferably, the adjusting threaded rod passes through the inner wall of the position-limiting movable cavity, the baffle plate fits the inner wall of the position-limiting movable cavity, and the adjusting threaded rod is movably connected to the third nail body.

[0010] Preferably, the diameter size of the first nail body matches the diameter size of the third nail body, and the diameter size of the first nail body is larger than the diameter size of the second nail body.

[0011] Preferably, the shape and size of the supporting elastic rod is smaller than the shape and size inside the second accommodating groove, and one end of the supporting elastic rod is fixedly connected to the second accommodating groove, and the other end of the supporting elastic rod is fixedly connected to the first accommodating groove.

[0012] Preferably, the limiting sliding block is fixedly connected to the second nail body, and the shape and size of the limiting sliding block partially coincide with the shape and size of the interior of the limiting sliding groove.

[0013] Preferably, the first nail body is further provided with:

[0014] A second limiting hole is opened at the lower part of the first nail body, and a second positioning bolt is passed through the second limiting hole.

[0015] Preferably, the third nail body is further provided with:

[0016] The first limiting hole is opened above the interior of the third nail body, and a first positioning bolt is passed through the interior of the first limiting hole.

[0017] Compared with the prior art, the utility model provides an ulnar intramedullary nail having the following beneficial effects: the ulnar intramedullary nail, by providing a third nail body with an adjustable position, pushes the supporting elastic rod to deform into an arc shape, presses against the inner wall of the medullary cavity, supports the bone, aligns the broken bone, and is conducive to the recovery of the broken bone. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of the third nail body of the utility model;

[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of the third nail body of the utility model;

[0021] Figure 4 It is a schematic diagram of the cross-sectional structure of the first nail body of the utility model.

[0022] In the figure: 1. first nail body; 2. second nail body; 3. first receiving groove; 4. third nail body; 5. first limiting hole; 6. first positioning bolt; 7. second positioning bolt; 8. second limiting hole; 9. supporting elastic rod; 10. second receiving groove; 11. adjusting threaded hole; 12. adjusting threaded rod; 13. baffle; 14. limiting movable cavity; 15. limiting slide groove; 16. limiting slider. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-4A ulnar intramedullary nail comprises a first nail body 1, a third nail body 4 is installed above the first nail body 1; the diameter of the first nail body 1 matches the diameter of the third nail body 4; a second limiting hole 8 is opened at the lower part of the first nail body 1, and a second positioning bolt 7 is passed through the second limiting hole 8; a first limiting hole 5 is opened at the upper part of the third nail body 4, and a first positioning bolt 6 is passed through the first limiting hole 5; four first receiving grooves 3 are opened on the outer surface of the third nail body 4, and a supporting elastic rod 9 is installed inside the first receiving groove 3, The other end of the supporting elastic rod 9 is fixedly connected to the first receiving groove 3, and a limited movable cavity 14 is provided inside the third nail body 4, and a second nail body 2 is movably installed inside the limited movable cavity 14; the diameter size of the second nail body 2 matches the diameter size inside the limited movable cavity 14, and the second nail body 2 can move inside the limited movable cavity 14, and the diameter size of the first nail body 1 is larger than the diameter size of the second nail body 2, and the first nail body 1 is fixedly installed in an integral manner below the second nail body 2, and a groove corresponding to the first receiving groove 3 is provided on the outer surface of the first nail body 1 The second receiving groove 10; the shape and size of the supporting elastic rod 9 are smaller than the shape and size inside the second receiving groove 10, and one end of the supporting elastic rod 9 is fixedly connected to the second receiving groove 10, the inner wall of the limiting movable cavity 14 is provided with a limiting slide groove 15, and the limiting slide groove 15 is internally movably installed with a limiting slider 16; the limiting slider 16 is fixedly connected to the second nail body 2, and the shape and size of the limiting slider 16 partially coincide with the shape and size inside the limiting slide groove 15; the adjusting threaded hole 11 is provided inside the second nail body 2, and the internal thread of the adjusting threaded hole 11 An adjusting threaded rod 12 is installed; the adjusting threaded rod 12 passes through the inner wall of the limiting movable cavity 14, and the adjusting threaded rod 12 is movably connected to the third nail body 4, and a baffle 13 is fixedly installed above the outer surface of the adjusting threaded rod 12, and the baffle 13 is in contact with the inner wall of the limiting movable cavity 14; by setting the third nail body 4 with an adjustable position, the supporting elastic rod 9 is pushed to deform into an arc shape, which presses against the inner wall of the medullary cavity to support the bone, align the broken bone, and is conducive to the recovery of the broken bone. At the same time, the setting of the baffle 13 plays a limiting role on the adjusting threaded rod 12.

[0025] Working principle: When using the ulnar intramedullary nail, first drive the ulnar intramedullary nail into the ulnar medullary cavity, then screw the adjusting threaded rod 12, and cooperate with the adjusting threaded hole 11 to push the second nail body 2 to move upward a short distance inside the limiting movable cavity 14, and at the same time, the limiting slider 16 slides inside the limiting slide groove 15, so that the first nail body 1 and the third nail body 4 are close to each other to squeeze the supporting elastic rod 9, and the supporting elastic rod 9 is deformed outward to press against the inner wall of the ulnar medullary cavity, and fits with the inner wall of the ulnar medullary cavity to support the ulna, so that the broken ulna is aligned, and then holes corresponding to the first limiting hole 5 and the second limiting hole 8 are drilled on the ulna, and then the first positioning bolt 6 and the second positioning bolt 7 are inserted to fix the ulnar intramedullary nail. This is the working principle of the ulnar intramedullary nail.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An ulnar intramedullary nail, characterized in that: include: A first nail body (1), a third nail body (4) is installed above the first nail body (1), four first receiving grooves (3) are provided on the outer surface of the third nail body (4), a supporting elastic rod (9) is installed inside the first receiving groove (3), a limited movable cavity (14) is provided inside the third nail body (4), a second nail body (2) is movably installed inside the limited movable cavity (14), the first nail body (1) is fixedly installed below the second nail body (2), a second receiving groove (10) corresponding to the first receiving groove (3) is provided on the outer surface of the first nail body (1), a limited sliding groove (15) is provided on the inner wall of the limited movable cavity (14), and a limited sliding block (16) is movably installed inside the limited sliding groove (15); An adjusting threaded hole (11) is provided inside the second nail body (2); an adjusting threaded rod (12) is installed on the internal thread of the adjusting threaded hole (11); and a baffle (13) is fixedly installed above the outer surface of the adjusting threaded rod (12).

2. The ulnar intramedullary nail according to claim 1, characterized in that: The diameter of the second nail body (2) matches the diameter of the interior of the position-limiting movable cavity (14), and the second nail body (2) can move inside the position-limiting movable cavity (14).

3. The ulnar intramedullary nail according to claim 1, characterized in that: The adjusting threaded rod (12) passes through the inner wall of the position-limiting movable cavity (14), the baffle (13) fits the inner wall of the position-limiting movable cavity (14), and the adjusting threaded rod (12) is movably connected to the third nail body (4).

4. The ulnar intramedullary nail according to claim 1, characterized in that: The diameter of the first nail body (1) matches the diameter of the third nail body (4), and the diameter of the first nail body (1) is greater than the diameter of the second nail body (2).

5. The ulnar intramedullary nail according to claim 1, characterized in that: The shape and size of the supporting elastic rod (9) are smaller than the shape and size inside the second accommodating groove (10), one end of the supporting elastic rod (9) is fixedly connected to the second accommodating groove (10), and the other end of the supporting elastic rod (9) is fixedly connected to the first accommodating groove (3).

6. The ulnar intramedullary nail according to claim 1, characterized in that: The limiting slide block (16) is fixedly connected to the second nail body (2), and the shape and size of the limiting slide block (16) partially coincide with the shape and size inside the limiting slide groove (15).

7. The ulnar intramedullary nail according to claim 1, characterized in that: The first nail body (1) is further provided with: A second limiting hole (8) is provided at the lower part of the first nail body (1), and a second positioning bolt (7) is passed through the interior of the second limiting hole (8).

8. The ulnar intramedullary nail according to claim 1, characterized in that: The third nail body (4) is also provided with: A first limiting hole (5) is provided above the interior of the third nail body (4), and a first positioning bolt (6) is passed through the interior of the first limiting hole (5).

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