CN216439295U

CN216439295U - Expansion fixation intramedullary nail

Info

Publication number: CN216439295U
Application number: CN202122600368.XU
Authority: CN
Inventors: 刘晓娜
Original assignee: 6th Medical Center of PLA General Hospital
Current assignee: 6th Medical Center of PLA General Hospital
Priority date: 2021-10-28
Filing date: 2021-10-28
Publication date: 2022-05-06
Anticipated expiration: 2031-10-28

Abstract

The utility model discloses an expansion fixing intramedullary nail which comprises a main nail body and a central stud, wherein the main nail body is a hollow pipe, the central stud is arranged in the main nail body, the main nail body is provided with an expansion strip, the expansion strip surrounds the periphery of the central stud and extends parallel to the axis of the main nail body, the upper end of the expansion strip is fixedly connected with the main nail body, the lower end of the expansion strip is connected with a nut, and the nut is arranged in the main nail body and is in threaded connection with the central stud. The intramedullary nail adopts an expansion principle, the lower end of the expansion strip is provided with the nut, the central stud is in threaded connection with the nut, and the nut moves upwards along the central stud in the rotation process of the central stud to drive the lower end of the expansion strip to move upwards to force the expansion strip to bend outwards and deform, so that the expansion strip is firmly clamped in the medullary hole, the intramedullary nail is further fixed, a locking nail does not need to be penetrated from the outside, the alignment problem is avoided, and the difficulty of the orthopedic operation is reduced.

Description

Expansion fixation intramedullary nail

Technical Field

The utility model belongs to the technical field of medical instruments, and particularly relates to an expansion fixation intramedullary nail.

Background

The internal fixation operation of locked intramedullary nail has become the main treatment means for treating femoral shaft fracture. In design, after the main nail body of the intramedullary nail is driven into the femur, a near-end locking nail needs to be fixed at the near end of the intramedullary nail, a far-end locking nail needs to be fixed at the far end, the main nail body of the intramedullary nail is prevented from displacing, and the far-end locking nail can be accurately fixed in place by 100 percent during in vitro testing of a front body. However, due to individual differences, the medullary cavity has a different size of forward-bending physiological curvature in the sagittal section, and the frontal plane also has a certain curvature change, and the problems of the direction of the operative nail-feeding point and the tendency of displacement to shear force after fracture reduction, etc., often result in elastic deformation of the distal end of the intramedullary nail with lock, and the displacement in a non-single plane changes, so that the positioning of the distal locking nail is not smooth.

Under the condition, any surgeon feels headache, and the surgeon needs to find the way by exposing the surgeon under X-ray for a long time to find the direction of the locking nail hole and lock the locking nail hole by hands, and more importantly, the surgery time is greatly prolonged, the surgery wound of the patient is increased, and the complications such as infection are increased.

SUMMERY OF THE UTILITY MODEL

Aiming at the current defects, the utility model provides an expansion fixation intramedullary nail.

In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:

the expansion fixing intramedullary nail is characterized by comprising a main nail body and a central stud, wherein the main nail body is a hollow tube, the central stud is arranged in the main nail body, the main nail body is provided with an expansion strip, the expansion strip surrounds the periphery of the central stud and is parallel to the axial line of the main nail body and extends, the upper end of the expansion strip is fixedly connected with the main nail body, the lower end of the expansion strip is connected with a nut, and the nut is arranged in the main nail body and is in threaded connection with the central stud.

Preferably, the side wall of the main nail body is divided into a plurality of strips by first cutting lines, wherein the strips comprise expansion strips and connecting strips, the lower ends of the expansion strips are provided with second cutting lines, and the second cutting lines are connected with the first cutting lines on two sides.

Preferably, the lower end side of the expansion strip is attached to the periphery side of the nut.

Preferably, the expansion strip and the nut are disposed at a proximal position and a distal position of the main spike body.

Preferably, the expansion strip and the connection strip are spaced apart.

Preferably, the expansion strip is recessed towards the middle of the inner side of the bolt.

Preferably, the central stud comprises a proximal section and a distal section, the distal section having a smaller diameter than the proximal section.

Preferably, the tail end of the proximal section corresponds to a nut at the proximal end of the main nail body, and the tail end of the proximal section is provided with threads; the tail end of the distal section corresponds to the nut at the distal end of the main nail body, and the tail end of the distal end is provided with threads.

The technical scheme can obtain the following beneficial effects:

the intramedullary nail adopts an expansion principle, the lower end of the expansion strip is provided with the nut, the central stud is in threaded connection with the nut, and the nut moves upwards along the central stud in the rotation process of the central stud to drive the lower end of the expansion strip to move upwards to force the expansion strip to bend outwards and deform, so that the expansion strip is firmly clamped in the medullary hole, the intramedullary nail is further fixed, a locking nail does not need to be penetrated from the outside, the alignment problem is avoided, and the difficulty of the orthopedic operation is reduced.

Drawings

FIG. 1 is a schematic representation of the present invention when unexpanded.

Figure 2 is a schematic representation of the present invention when expanded.

Fig. 3 is a sectional view of fig. 1.

Fig. 4 is a sectional view a-a of fig. 3.

Fig. 5 is a schematic representation of an expansion strip of the present invention.

FIG. 6 is a schematic view of the center stud of the present invention.

In the figure:

1. the main nail body comprises a central stud, 11, a proximal end section, 12, a distal end section, 2, a main nail body, 21, a proximal end position, 22, a distal end position, 3, an expansion strip, 31, a first cutting line, 32, a second cutting line, 4, a connecting strip, 5 and a nut.

Detailed Description

The utility model is further described below with reference to the accompanying drawings:

as shown in fig. 1-3, the utility model discloses an expansion fixing intramedullary nail, which comprises a main nail body 2 and a central stud 1, wherein the main nail body 2 is a hollow pipe, the central stud 1 is arranged in the main nail body 2, the main nail body 2 is provided with an expansion strip 3, the expansion strip 3 surrounds the periphery of the central stud 1 and extends parallel to the axis of the main nail body 2, the upper end of the expansion strip 3 is fixedly connected with the main nail body 2, the lower end of the expansion strip is connected with a nut 5, and the nut 5 is arranged in the main nail body 2 and is in threaded connection with the central stud 1.

During the use, central double-screw bolt 1 and the 5 screw-thread fit of nut, rotating central double-screw bolt 1, nut 5 along central double-screw bolt 1 rebound, drive 3 lower extremes of inflation strip and shift up, inflation strip 3 is crooked, outwards hunch-up, the chucking is in the pulp cavity, need not wear to establish the lock nail from main nail body 2 one side, has avoided the lock nail to be difficult to the problem accurate with main nail body complex, also very simplifies in the operation, reduces the operation degree of difficulty.

Specifically, as shown in fig. 1, 3 and 4, the side wall of the main nail body 2 is divided into a plurality of strips by the first cutting lines 31, wherein the plurality of strips include the expansion strips 3 and the connection strips 4, the second cutting lines 32 are arranged at the lower ends of the expansion strips 3, and the second cutting lines 32 are connected with the first cutting lines 31 at two sides. The expansion strip 3 is formed by cutting the side wall of the main nail body 2, no additional part is added, the assembly of multiple parts is avoided, the volume of the intramedullary nail is not increased, and the processing is convenient.

As shown in fig. 4, the inner side of the lower end of the expansion strip 3 is attached to the periphery of the nut 5, and when the expansion strip 3 is in an unexpanded arch state, the outer side of the main nail body 2 looks flat and smooth, has high strength, facilitates the smooth implantation of the main nail body 2 into the medullary cavity, and is not easy to deform.

The expansion strips 3 and the nuts 5 are arranged at the near end position 21 and the far end position 22 of the main nail body 2, after the main nail body 2 is implanted into a medullary cavity, the expansion strips 3 are arranged at the near end position 21 and the far end position 22 of the main nail body, and the expansion strips 3 expand at the upper position and the lower position, so that the functions of the traditional near-end locking nail and the far-end locking nail are exerted, the main nail body 2 is tightly clamped in the medullary cavity, and the clamping is firm.

The expansion strip 3 and the connection strip 4 are arranged at intervals, the expansion strip 3 and the connection strip 4 are uniformly arranged, when the expansion strip 3 expands, the clamping is uniform, and the connection strength is good.

As shown in fig. 5, the expansion strip 3 is concave towards the middle of the inner side surface of the central stud 1, and when the expansion strip 3 is pressed, the expansion strip 3 is easier to arch outwards, so that the expansion strip 3 can be arched without great effort.

Referring to fig. 2 and 6, the central stud 1 includes a proximal section 11 and a distal section 12, the diameter of the distal section 12 is smaller than that of the proximal section 11, the end of the proximal section 11 corresponds to the proximal position 21 of the main nail body by a nut, and the end of the proximal section 11 is provided with a thread; the end of the distal section 12 corresponds to the main nail body distal position 22 nut, and the end of the distal section 12 is provided with screw threads. When the central stud 1 is inserted, the central stud 1 firstly passes through the proximal nut 5, and the distal end section 12 has a small diameter and can easily pass through to reach the distal position of the main nail body 2, so that the central stud 1 does not need to be slowly screwed, and the time is saved. Therefore, after the central stud 1 is inserted, the threads of the proximal section 11 are approximately abutted against the proximal position nut 5, the threads of the distal section 12 are approximately abutted against the distal position nut 5 (one of the threads may have a small distance and cannot be completely abutted against the other), and only by screwing the central stud 1, the two threads and the nut 5 are matched and continuously screwed, the nut 5 moves upwards along with the central stud 1, and the expansion strip 3 is forced to arch.

The above description is the preferred embodiment of the present invention, and it is within the scope of the appended claims to cover all modifications of the utility model which may occur to those skilled in the art without departing from the spirit and scope of the utility model.

Claims

1. An expansion fixation intramedullary nail, characterized in that: the expansion bolt comprises a main bolt body and a central bolt, wherein the main bolt body is a hollow pipe, the central bolt is arranged in the main bolt body, the main bolt body is provided with an expansion strip, the expansion strip surrounds the periphery of the central bolt and is parallel to the axis of the main bolt body, the upper end of the expansion strip is fixedly connected with the main bolt body, the lower end of the expansion strip is connected with a nut, and the nut is arranged in the main bolt body and is in threaded connection with the central bolt.

2. The expansion fixation intramedullary nail of claim 1, wherein: the main nail body side wall is divided into a plurality of strips by first cutting lines, wherein the strips comprise expansion strips and connecting strips, the second cutting lines are arranged at the lower ends of the expansion strips, and the second cutting lines are connected with the first cutting lines on the two sides.

3. The expansion fixation intramedullary nail of claim 2, wherein: the inner side of the lower end of the expansion strip is attached to the periphery of the nut.

4. The expansion fixation intramedullary nail of claim 1, wherein: the expansion strip and the nut are arranged at the proximal end position and the distal end position of the main nail body.

5. The expansion fixation intramedullary nail of claim 2, wherein: the expansion strip and the connecting strip are arranged at intervals.

6. The expansion fixation intramedullary nail of claim 1, wherein: the expansion strip is sunken towards the middle of the inner side surface of the central stud.

7. The expansion fixation intramedullary nail of claim 4, wherein: the center stud includes a proximal section and a distal section, the distal section having a smaller diameter than the proximal section.

8. The expansion fixation intramedullary nail of claim 7, wherein: the tail end of the proximal section corresponds to the nut at the proximal end of the main nail body, and the tail end of the proximal section is provided with threads; the tail end of the distal section corresponds to the nut at the distal end of the main nail body, and the tail end of the distal section is provided with threads.