Far-end locking-free humeral intramedullary nail

Abstract

The utility model provides a far-end locking-free humeral intramedullary nail which comprises a main nail body, the main nail body comprises a near-end portion and a far-end portion, the free end of the far-end portion is in a gradually narrowed cone shape, threads are arranged on the surface of the far-end portion, and the length of the thread section is 4-5 cm. A plurality of fixing holes which are distributed in a crossed manner are formed in the near end part, and fixing screws penetrate through the fixing holes. The main nail body is of a hollow structure and is linear. The intramedullary nail is straight, the near end of the intramedullary nail has no angle, the intramedullary nail enters completely through rotation, the locking difficulty of the far end of the intramedullary nail is lowered, and vascular injury is reduced. The elbow joint can be bent and stretched in the early stage after operation, and fracture healing can be promoted.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of medical apparatus and instruments, and particularly relates to a far-end lock-free humeral intramedullary nail. BACKGROUND

[0002] Different fixing methods are taken for humeral fractures occurring at different positions, and the fractures occurring at both ends are mainly fixed by steel plates, and the fractures occurring at the humeral shaft are mainly fixed by locked intramedullary nails. The locked intramedullary nail encounters problems of inaccurate positioning and blood vessel and nerve injury when locking the far end. Therefore, it has become the consensus of many doctors to design a far-end lock-free intramedullary nail. SUMMARY

[0003] In view of the above problems, the utility model aims to provide a far-end lock-free humeral intramedullary nail. The elbow joint can be early flexed and stretched, and the surgical risk can be reduced.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme that:

[0005] A far-end lock-free humeral intramedullary nail, comprising a main nail body, the main nail body comprises a proximal end part and a distal end part, the free end of the distal end part is tapered and the surface is provided with threads; a plurality of fixing holes in cross distribution are arranged on the proximal end part, and the fixing holes are used for penetrating a fixing screw.

[0006] Further, the main nail body is a hollow structure and is in a straight line type.

[0007] The proximal end part of the main nail body is in a straight line type.

[0008] A one-character-shaped clamping groove is arranged at the top of the main nail body.

[0009] The length of the thread segment arranged at the free end of the distal end part is 4-5 cm.

[0010] Compared with the prior art, the utility model has the beneficial effects that: the distal end of the intramedullary nail designed by the utility model is tapered and threaded, and is designed as a hollow structure. During the operation, a hole is first opened in the medial side of the greater tubercle of the humeral head by using an opening device, the fracture is first reset by hand, a gold finger is directly placed into the distal end of the fracture, a guide wire is inserted, the proximal end of the humerus is reamed, the thickness of the humeral intramedullary cavity and the expected length of the intramedullary nail are measured, and the intramedullary nail is screwed in. The intramedullary nail is straight, the proximal end has no angle, and is completely inserted by rotation. If the resistance is large when being screwed in, the intramedullary nail can be taken out to ream the intramedullary cavity, and of course the intramedullary nail can be placed after the intramedullary cavity is reamed. The remaining steps are the same as the steps of placing the proximal end of the humerus into the locked intramedullary nail, that is, the position of the placed sleeve is selected, a hole is drilled, and the nail is placed. After the above structure and method are adopted, the locking difficulty of the distal end of the intramedullary nail is reduced, and the blood vessel injury is reduced. The elbow joint can be flexed and stretched in the early stage after the operation, and the fracture healing can be promoted. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a structure diagram of a distal end lock-free humeral intramedullary nail. DETAILED DESCRIPTION

[0012] Referring to Figure 1 Fig. 1, a distal end lock-free humeral intramedullary nail includes a main nail body 10, which includes a proximal end portion 11 and a distal end portion 12. The free end of the distal end portion is tapered and the surface is provided with threads 13. A plurality of fixing holes 14 are arranged in a cross distribution on the proximal end portion, and the fixing holes are used for penetrating a fixing screw.

[0013] The main nail body is a hollow structure and is linear.

[0014] The proximal end portion of the main nail body is linear.

[0015] The top of the main nail body is provided with a one-character-shaped clamping groove 15.

[0016] The length of the threaded section provided on the free end of the distal end portion is 4-5 cm.

[0017] In view of the fact that the distal end medullary cavity of the humerus gradually becomes flat and narrow, the distal end of the intramedullary nail designed in the utility model is tapered and threaded, and is designed as a hollow structure. During the operation, a punch is used to punch a hole in the medial side of the greater tubercle of the humeral head, the fracture is manually reduced, the distal end of the fracture is directly inserted into the bone by using a gold finger, a guide wire is inserted, the proximal end of the humerus is reamed, the thickness of the intramedullary cavity of the humerus and the expected length of the intramedullary nail are measured, and the intramedullary nail is screwed in. The intramedullary nail is straight, the proximal end is angle-free, and is completely inserted by rotation. If the resistance is large when the intramedullary nail is screwed in, the intramedullary nail can be taken out to ream the medullary cavity. Of course, the medullary cavity can also be reamed first and then the nail is inserted. The remaining steps are the same as the steps of inserting the proximal end lock humeral intramedullary nail, that is, the position of the insertion sleeve is selected, a hole is drilled, and the nail is inserted.

[0018] The distal end lock-free intramedullary nail is applied to treat 14 cases of humeral fractures, including 11 male cases and 3 female cases, with the oldest being 81 years old and the youngest being 25 years old. The longest follow-up time is 1 year and 8 months, and the shortest follow-up time is 2 months. Among them, 11 cases are completely healed, and 3 cases are partially healed. All of them are closed reduction, and there is no intramedullary nail loosening and no wound infection during the follow-up period.

[0019] The above describes only a preferred specific embodiment of the utility model, but the protection scope of the utility model is not limited to this. Any skilled person in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, which should be covered within the protection scope of the utility model.

Claims

1. A distal, lockless humeral intramedullary nail, characterized in that, The main nail body comprises a proximal end and a distal end, the free end of the distal end is tapered and threaded.

2. A distally self-locking humeral intramedullary nail according to claim 1, wherein, The main nail body is a hollow structure and is linear.

3. A distally self-locking humeral intramedullary nail according to claim 2, wherein, The proximal end of the main nail body is linear.

4. The distally self-locking humeral intramedullary nail of Claim 1, wherein, The top of the main nail body is provided with a one-character-shaped clamping slot.

5. The distally self-locking humeral intramedullary nail of Claim 1, wherein, The length of the threaded section provided on the free end of the distal end is 4-5 cm.

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