CN217408940U - Elastic internal fixing device for long bone - Google Patents

Abstract

The utility model discloses an elasticity internal fixation device for long bone relates to medical instrument technical field. The elastic internal fixing device for the long bone comprises a female needle, wherein the female needle is arranged in a hollow manner, a limiting groove is formed in the outer wall of the female needle, and the first locking piece penetrates through the bone and is partially accommodated in the limiting groove; and one end of the core needle is slidably inserted into the female needle, and the other end of the core needle is fixed on the bone through a second locking piece. The utility model discloses an elasticity internal fixation device for long bone because the core needle inserts in the female needle, and can with female needle relative slip, consequently, implant behind the patient crowd that the skeleton such as children and teenagers is not fully developed maturity with female needle and core needle, when skeleton development, relative slip realizes elastic fixation between female needle and the core needle, guarantees the intramedullary fixation effect of the crowd of not fully developed maturity. The spacing groove of female needle outer wall and the cooperation of first retaining member, core needle distal end and the cooperation of second retaining member can prevent the drunkenness and the torsion of female needle and core needle.

Description

Elastic internal fixing device for long bone

Technical Field

The utility model relates to the field of orthopedic medical equipment, in particular to an elastic internal fixation device for long bones.

Background

In the treatment of bone injuries, immobilization is an important link therein and is therefore of great interest. The internal fixation of fracture includes intramedullary nail, bone fracture plate, tension band and other therapeutic means. The intramedullary fixation is an important fracture internal fixation mode for patients with incompletely developed bones such as children and teenagers, can ensure internal fixation and simultaneously keep elastic fixation, does not interfere with the development of bones, and achieves optimal treatment effect.

At present, intramedullary implants are of various types, which are generally used as intramedullary needles clinically, and the intramedullary needle internal fixation mode is that two intramedullary needles are symmetrically placed into a bone marrow cavity to achieve the purpose of elastic fixation. However, in the clinical treatment process, the current intramedullary fixation mode has certain defects and needs to be optimized. For example, after operation, the patient moves the affected limb, the intramedullary needle is twisted or the implant slides into the medullary cavity, so that the internal fixation fails, irreversible surgical complications are generated to the patient group with incompletely developed bone, secondary surgery for repair is possibly required, the treatment time is prolonged, the patient treatment experience is poor, and the operation difficulty of the treatment personnel is high. Therefore, the inventors thought that it is necessary to optimize the conventional intramedullary nail internal fixation device to enhance the therapeutic effect.

SUMMERY OF THE UTILITY MODEL

The utility model discloses just in order to solve above-mentioned technical problem, an elasticity internal fixation device for long bone is proposed.

The utility model adopts the following technical proposal.

An elastic internal fixation device for a long bone, comprising:

the female needle is arranged in the hollow space, a limiting groove is formed in the outer wall of the female needle, and the first locking piece penetrates through a bone and is partially accommodated in the limiting groove;

and one end of the core needle is slidably inserted into the female needle, and the other end of the core needle is fixed on the bone through a second locking piece.

As a preferable mode of the elastic internal fixation device for a long bone, an axis of the limit groove and an axis of the female needle form an acute angle.

As a preferable mode of the above elastic internal fixation device for a long bone, the first locking member is a blocking nail.

As a preferable proposal of the elastic internal fixation device for the long bone, a cap is movably connected with the proximal end of the female needle.

As a preferable mode of the above elastic internal fixation device for a long bone, a female needle insertion hole is provided inside the distal end of the cap, and a first connection portion is provided at the proximal end of the female needle, and the first connection portion is connected to the female needle insertion hole of the cap.

As a preferable mode of the above elastic internal fixation device for a long bone, the cap proximal end is provided with a cap driving groove.

As a preferable scheme of the elastic internal fixation device for a long bone, the female pin further comprises a second connection part, and the second connection part is provided with an external thread and is in threaded connection with the inner wall of the medullary cavity of the bone.

As a preferable mode of the above elastic internal fixation device for a long bone, the female needle proximal end is internally formed with a female needle driving groove.

As a preferable mode of the above elastic internal fixation device for a long bone, the core pin includes a needle body having a distal end formed with a spiral tip.

As a preferable mode of the above elastic internal fixation device for long bones, the second locking member is a kirschner wire which is placed in the spiral gap of the spiral tip.

The utility model discloses following beneficial effect has been obtained.

The utility model discloses an elasticity internal fixation device for long bone because the core needle inserts in the female needle, and can with female needle relative slip, consequently, implant behind the patient crowd that the skeleton such as children and teenagers is not fully developed maturity with female needle and core needle, when skeleton development, relative slip realizes elastic fixation between female needle and the core needle, guarantees the intramedullary fixation effect of the crowd of not fully developed maturity. The spacing groove of female needle outer wall and the cooperation of first retaining member, core needle distal end and the cooperation of second retaining member can prevent the drunkenness and the torsion of female needle and core needle.

Drawings

FIG. 1 is a schematic view of an embodiment of the present invention showing a flexible internal fixation device for long bones inside a bone;

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

FIG. 3 is a front view of a cap in an embodiment of the invention;

FIG. 4 is a cross-sectional view taken along line B-B of FIG. 3;

FIG. 5 is a schematic structural view of the female needle according to the embodiment of the present invention;

FIG. 6 is a sectional view taken along line C-C of FIG. 5;

fig. 7 is a schematic structural view of a core pin according to an embodiment of the present invention.

Wherein, 1. skeleton; 2. capping; 3. a female needle; 4. a core needle; 5. a first locking member; 6. a second locking member; 7. a cap driving groove; 8. a female needle insertion hole; 9. a first connection portion; 10. a second connecting portion; 11. a female needle driving groove; 12. a through hole; 13. a limiting groove; 14. a needle body; 15. a spiral tip.

Detailed Description

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

As shown in fig. 1 to 7, the present embodiment provides an elastic internal fixation device for a long bone, which includes a cap 2, a female pin 3, and a core pin 4. The cap 2 is movably connected with the proximal end of the female needle 3. The female needle 3 is arranged in a hollow way, a limiting groove 13 is formed on the outer wall of the female needle 3, and the first locking piece 5 penetrates through the bone 1 and is partially accommodated in the limiting groove 13. The female needle 3 is provided with a through hole 12 inside. One end of the core needle 4 is slidably inserted into the through hole 12 of the female needle 3, and the other end is fixed on the bone 1 through the second locking piece 6. In other embodiments, the female needle 3 of the elastic internal fixation device for long bones may not be attached to the cap 2, chosen as the case may be.

In the elastic internal fixation device in the embodiment, the core needle 4 is inserted into the female needle 3 and can slide relative to the female needle 3, so that after the female needle 3 and the core needle 4 are implanted into patients who have not completely developed and matured bones 1, such as children and teenagers, when the bones 1 are developed, the female needle 3 and the core needle 4 slide relative to each other to realize elastic fixation, thereby ensuring the intramedullary fixation effect of the patients who have not completely developed and matured bones. The limiting groove 13 on the outer wall of the female needle 3 is matched with the first locking piece 5, and the far end of the core needle 4 is matched with the second locking piece 6, so that the female needle 3 and the core needle 4 can be prevented from moving and twisting.

The axis of spacing groove 13 is the acute angle with female needle 3's axis, is convenient for on the one hand with the installation cooperation of first retaining member 5, and on the other hand can realize blockking the effect to female needle 3. First retaining member 5 is for blockking the nail in this embodiment, blocks that the nail part holds in spacing groove 13, can realize support and spacing to female needle 3, avoids the axial float and the circumferential direction of female needle 3 to twist reverse, blocks that the nail is located the part outside spacing groove 13 and skeleton 1 threaded connection.

A female needle inserting hole 8 is formed in the far end of the cap 2, a first connecting portion 9 is arranged at the near end of the female needle 3, and the first connecting portion 9 is connected with the female needle inserting hole 8 of the cap 2. Wherein, the inner wall of female needle insert hole 8 is equipped with the internal thread, and the first connecting portion 9 of block 2 is equipped with the external screw thread, female needle insert hole 8 and first connecting portion 9 threaded connection. In other embodiments, other connection methods can be selected to connect the cap 2 and the female needle 3.

To facilitate implantation of the cap 2 in the medullary cavity, the cap 2 is provided with a cap drive slot 7 at its proximal end for engaging a tool to rotate the cap 2. A connecting hole is arranged between the cap driving groove 7 and the female needle inserting hole 8, the diameter of the connecting hole is smaller than that of the core needle 4, and the core needle 4 can be prevented from penetrating out of the cap 2.

The female needle 3 further comprises a second connecting part 10, wherein the second connecting part 10 is provided with external threads and is in threaded connection with the inner wall of the medullary cavity, and the second connecting part 10 is used for connecting the female needle 3 to the bone 1 and is beneficial to combination of the female needle 3 and the medullary cavity of the bone 1.

In order to implant the female needle 3 into the medullary cavity, a female needle driving groove 11 for rotating the female needle 3 in cooperation with a tool is formed inside the proximal end of the female needle 3.

The core needle 4 comprises a needle body 14, the needle body 14 is integrally a smooth sliding rod and is used for sliding in cooperation with the hollow part in the female needle 3, a spiral tip 15 is formed at the far end of the needle body 14, and particularly, a metal wire connected to the needle body 14 is bent to form a spiral tip structure and is used for screwing the core needle 4 into a medullary cavity of the skeleton 1 and facilitating insertion of the second locking piece 6 into a spiral gap.

The second locking member 6 is a k-wire which is placed in the helical gap of the helical tip 15 and is able to limit axial play and circumferential twisting of the core pin 4.

The following is the process of using the utility model in the orthopedic surgery:

after anesthesia succeeds, firstly, the fracture part is reset, a proper nail feeding point is found through perspective, and after a matched tool is used for opening a medullary cavity of the skeleton 1, the spiral tip 15 of the core needle 4 is screwed in; after the spiral tip 15 is implanted to the far end of the medullary cavity, the through hole 12 of the female needle 3 is sleeved on the needle body 14 of the core needle 4, and the female needle 3 is fixed at the near end of the skeleton 1 through the thread on the second connecting part 10; the cap 2 is screwed in by a tool, and is connected and fastened with the external thread of the first connecting part 9 through the internal thread of the female needle inserting hole 8; after the implantation of the cap 2 is completed, the blocking nail penetrates into the limiting groove 13 and is in threaded connection with the skeleton 1; finally distal locking is achieved by fluoroscopy passing the k-wire through the helical tip 15 of the core needle 4. The elastic internal fixation device of the embodiment can lock the far end and the near end, and elastically fix the broken end of the skeleton 1, so that the fracture is repaired, the growth of the skeleton 1 is not influenced by intramedullary fixation, the synchronous growth with the normal bone is ensured, and the phenomenon of inconsistent length is avoided.

It should be noted that, the present application refers to the far end and the near end as clinical terms, and in clinical work, the heart of the body is generally taken as a standard, the part near the heart is taken as the near end, and the part far from the heart is taken as the far end.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (10)

1. An elastic internal fixation device for a long bone, characterized by: the method comprises the following steps:

the female needle (3) is arranged in the hollow space, a limiting groove (13) is formed in the outer wall of the female needle (3), and the first locking piece (5) penetrates through the bone (1) and is partially accommodated in the limiting groove (13);

one end of the core needle (4) is slidably inserted into the female needle (3), and the other end of the core needle is fixed on the skeleton (1) through a second locking piece (6).

2. The elastic internal fixation device for long bones of claim 1, characterized in that: the axis of the limiting groove (13) and the axis of the female needle (3) form an acute angle.

3. The elastic internal fixation device for long bones of claim 1, wherein: the first locking piece (5) is a blocking nail.

4. The elastic internal fixation device for long bones of claim 1, characterized in that: the proximal end of the female needle (3) is movably connected with a cap (2).

5. An elastic internal fixation device for long bones according to claim 4, characterized in that: the utility model discloses a novel safety cap, including block cap (2), block cap (2) distal end is inside to be equipped with female needle insert hole (8), the near-end of female needle (3) is equipped with first connecting portion (9), first connecting portion (9) with the female needle insert hole (8) of block cap (2) are connected.

6. An elastic internal fixation device for long bones according to claim 4, characterized in that: the near end of the cap (2) is provided with a cap driving groove (7).

7. An elastic internal fixation device for long bones according to claim 5, characterized in that: the female needle (3) further comprises a second connecting part (10), wherein an external thread is arranged on the second connecting part (10) and is in threaded connection with the inner wall of the medullary cavity of the bone (1).

8. The elastic internal fixation device for long bones of claim 1, characterized in that: a female needle driving groove (11) is formed in the inner part of the proximal end of the female needle (3).

9. The elastic internal fixation device for long bones of claim 1, characterized in that: the core needle (4) comprises a needle body (14), and a spiral tip (15) is formed at the distal end of the needle body (14).

10. The elastic internal fixation device for long bones of claim 9, characterized in that: the second locking piece (6) is a Kirschner wire, and the Kirschner wire is arranged in the spiral gap of the spiral tip (15).

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