CN204744375U - Elasticity intramedullary nail - Google Patents

Abstract

The utility model relates to an elastic intramedullary nail, which comprises a nail body and a sealing cap. The shape of the nail body is elongated, the head of the nail body is flat, and the width of the front end of the nail body gradually decreases from back to front. Small, the sealing cap has a cylindrical structure, a counterbore is provided inside the front end of the sealing cap, and a section of thread is provided outside the sealing cap. During its use, two elastic intramedullary nails are staggered inside the medullary cavity of long bones, and the elasticity of the elastic intramedullary nails is used to correct the dislocated bones. During the postoperative fracture healing period, the length and axis of the bone are always maintained to avoid shortening. , and through the design of the cap, the cap ensures that the elastic intramedullary nail cannot withdraw from the medullary cavity, and the cap passes through a minimally invasive approach without enlarging the incision or additional drilling. After the fracture heals, it is easier to remove through the cap Elastic intramedullary nail.

Description

elastic intramedullary nail

technical field

The utility model relates to the technical field of medical equipment, in particular to an elastic intramedullary nail.

Background technique

Intramedullary nail is a relatively commonly used medical device for fracture treatment, which belongs to orthopedic internal fixation device in medical device. Intramedullary nails are generally used for internal fixation of long bone fractures such as radius, humerus, femur, and tibia. They can control the axial force line of the fracture site, promote fracture healing, and enable patients to get out of bed as soon as possible. The price of steel plate treatment is relatively low, its strength is high, and it is not easy to break like a steel plate.

The currently used intramedullary nail structure has an intramedullary nail rod, and a through hole is provided at the proximal end or the distal end of the intramedullary nail rod. One end of the screw is connected and fixed with the long bone through threads, and the other end of the screw can pass through the through hole for positioning the intramedullary nail rod. Usually, the diameter of the through hole on the intramedullary nail rod is larger than that of the screw rod, so that the screw rod can penetrate into the intramedullary nail rod more easily because the intramedullary nail rod is placed inside the fractured long bone during surgery. Due to the gap between the through hole and the screw rod, the connection between the intramedullary nail rod and the screw cannot be truly locked, and it is easy to shake, which will cause rotation deformity at the fracture site and affect bone healing.

Utility model content

The technical problem to be solved by the utility model is: to provide an elastic intramedullary nail, which can overcome the shortcomings of the currently used intramedullary nails, and avoid the occurrence of rotational deformities at fractures and the like.

In order to solve the above problems, the technical solution adopted by the utility model is: an elastic intramedullary nail, including a nail body and a sealing cap, the shape of the nail body is elongated, the head of the nail body is flat, and the front end of the nail body The width of the sealing cap gradually decreases from the back to the front. The sealing cap is a cylindrical structure. The front end of the sealing cap is provided with a counterbore inside.

As a preferred solution, the nail body is a cylindrical structure except the head, and the diameter of the nail body is 1.5mm-5.0mm.

As a preferred solution, the head of the nail body has a certain curvature.

As a preferred solution, the rear end of the sealing cap is flat.

The beneficial effects of the utility model are: the above-mentioned elastic intramedullary nail, when in use, two elastic intramedullary nails are staggered inside the medullary cavity of the long bone, and the elasticity of the elastic intramedullary nails is used to correct the dislocated bone, and the postoperative fracture During the healing period, the length and axis of the bone are always maintained to avoid shortening, and the design of the cap ensures that the elastic intramedullary nail cannot withdraw from the medullary cavity, and the cap passes through a minimally invasive approach without enlarging the incision Or additional drilling, after the fracture heals, it is easier to remove the elastic intramedullary nail through the sealing cap.

Description of drawings

Fig. 1 is the structural representation of nail body in the utility model;

Fig. 2 is the structural representation of sealing cap in the utility model;

Fig. 3 is a schematic cross-sectional structure diagram of Fig. 2;

Fig. 4 is the use state figure of the utility model;

Among the figure: 1, nail body, 2, sealing cap, 3, counterbore, 4, thread.

Detailed ways

The elastic intramedullary nail described in the present utility model will be further described in detail through specific embodiments below.

As shown in Figure 1, the elastic intramedullary nail comprises a nail body 1 and a sealing cap 2, the shape of the nail body 1 is elongated, the nail body 1 is a cylindrical structure except the head, and the diameter of the nail body 1 is 1.5 mm to 5.0 mm, the head of the nail body 1 is flat and has a certain curvature, so as to facilitate insertion into the medullary cavity, and the width of the front end of the nail body 1 gradually decreases from back to front, as shown in Figure 2 and Figure 3 As shown, the sealing cap 2 is a cylindrical structure, the inside of the front end of the sealing cap 2 is provided with a counterbore 3, the outside of the sealing cap 2 is provided with a section of thread 4, and the thread 4 has an anti-retreat function groove, and the rear of the sealing cap 2 The end is flat, which is convenient for the cap 2 to be connected with the thread 4 of the bone. Among them, the nail body 1 and the sealing cap 2 are optional in various specifications and sizes.

As shown in Figure 4, the above-mentioned elastic intramedullary nails are interlaced in the medullary cavity of long bones through two elastic intramedullary nails during use, and the elasticity of the elastic intramedullary nails is used to correct the dislocated bones. , always maintain the length and axis of the bone to avoid shortening, and through the design of the cap 2, the tail of the nail body 1 is set in the counterbore 3 of the cap 2, and then the cap 2 is fixed to the bone through the thread 4, The cap 2 ensures that the elastic intramedullary nail cannot be withdrawn from the medullary cavity, and the cap 2 passes through a minimally invasive approach without enlarging the incision or additional drilling. After the fracture heals, it is easier to remove the elastic intramedullary nail through the cap 2.

Above-mentioned embodiment only illustrates the principle of the present invention and its effect, and the embodiment of partial use, and is not intended to limit the present utility model; Under the premise of creating the concept of the utility model, some deformations and improvements can also be made, and these all belong to the protection scope of the utility model.

Claims (4)

1. flexible intramedullary nail, comprise rivet nut and sealing cap, it is characterized in that: the shape of described rivet nut is strip, the head of rivet nut is flat, and the width of rivet nut front end reduces back to front gradually, described sealing cap is column construction, and the inside, front end of sealing cap is provided with counterbore, the outer setting of sealing cap has one section of screw thread, and screw thread has anti-back function trough.

2. flexible intramedullary nail according to claim 1, is characterized in that: described rivet nut is cylindrical structure except head, and shaft diameter is 1.5mm ~ 5.0mm.

3. flexible intramedullary nail according to claim 1 and 2, is characterized in that: the head of described rivet nut is with certain radian.

4. flexible intramedullary nail according to claim 1 and 2, is characterized in that: the rear end of described sealing cap is flat.