TW201909848A - Sacro-iliac bone screw - Google Patents

Abstract

A bone screw includes: a shaft and a sleeve. The shaft has a first male thread and a second male thread at two ends thereof. The sleeve is fitted over the shaft, and a first end and a second end opposite to the first end. On an inner wall of the first end is a female thread engaged with the first male thread, on an outer wall of the first end is a third male thread, on an outer wall of the second end is a forth male thread, a pitch of the forth male thread is greater than that of the third male thread, and the inner wall of the second end communicates with that of the first end so that the shaft optionally penetrates to the second end after penetrating to the first end.

Description

Tibial nail

This creation is about a kind of bone nail, and it is especially related to a kind of patella nail.

Dislocation of the ankle is one of the common traumas caused by pelvic fractures. The pelvis has a closed annular structure composed of the humerus, the humerus on both sides of the humerus, and the pubic bone at the front end of the humerus, and the tibia and the tibia are connected through the ankle joint. Therefore, the ankle joint is important for the stability and integrity of the pelvis. If the ankle joint is not properly restored after a pelvic fracture, it may cause organ dysfunction in the pelvis, pain in the lower back, or inconvenience in lower limb movement.

When the pelvis is fractured, the humeral nail is often used to fix the broken bone. However, due to the structural design of the nail used, it does not provide an effective stabilizing force to cause the broken bone to easily shake. Moreover, it has no pressurizing effect on the ankle joint and cannot be reset. In order to achieve an ankle reduction, additional fusion is required.

For the sake of the job, the problem of solving the clinical problem of the currently used tibia nail is indeed one of the topics actively solved by the technical field and/or the industry to which the author belongs.

One of the aims of the present invention is to propose a novel bone nail which can solve the problem that the conventional patella nail is easy to cause bone sloshing in the clinic.

Another object of the present invention is to propose a novel bone nail which can solve the problem that the conventional patella nail has no clinical effect on the ankle joint.

Thus, in order to achieve the above and/or other objects, the present invention proposes a bone nail comprising: a rod body, and a sleeve. The rod body has a first male thread and a second male thread at its two ends. The sleeve is a socket body and has a first end and a second end opposite to the first end, the first end inner wall is provided with a female thread for engaging the first male thread, and the first end outer wall is provided with a third Thread, the second end outer wall is provided with a fourth male thread, the fourth male thread has a pitch larger than the third male thread pitch, and the second end inner wall is in communication with the first end inner wall, so that the rod body is self-sleeve first end After piercing, it is optionally worn to the second end.

According to the creation, when the nail is used for the fracture of the tibia, the sleeve can transmit relative displacement between the tibia and the tibia through the characteristic of the pitch of the fourth male thread being larger than the pitch of the third male thread. In this way, the ankle joint pressure between the tibia and the tibia can be fused. In addition, the rod body and the sleeve can mesh with the first male thread through the female thread to make a relative displacement between the second male thread and the third male thread, so that the relative fracture of the broken bone of the tibia is caused by the joint. In this way, the broken bone can be fixed.

In order to make the above and/or other objects, functions and features of the present invention more obvious and easy to understand, the preferred embodiments are described below, and the detailed description is as follows:

Referring to FIG. 1 , a bone nail according to an embodiment of the present invention is shown, which comprises a rod body (1) and a sleeve (2). In order to attach the osteoblasts to accelerate fracture healing, the surface of the rod (1) and the surface of the cannula (2) may be treated by a porous coating.

As shown in Figure 2, the shaft (1) has a first end and a second end opposite the first end. The first end is provided with a first male thread (11) and the second end is provided with a second male thread (12). In addition, the second end can be convexly provided with a tapping tooth (13) to allow the nail to tap.

As shown in Fig. 2, the sleeve (2) is a socket rod body (1) and has a third end and a fourth end with respect to the third end. The third end inner wall is provided with a female thread (21), and the female thread (21) engages the first male thread (11) of the rod body (1); the third end outer wall is provided with a third male thread (22). The fourth end outer wall is provided with a fourth male thread (23), and the fourth end inner wall is in communication with the third end inner wall, such that the rod body (1) penetrates from the third end of the sleeve (2), optionally Wear to the fourth end. In addition, the length of the first male thread (11) of the rod body (1) may be equal to or greater than the length of the female thread (21) of the sleeve (2) to adjust the combination of the rod body (1) and the sleeve (2). The length comes in response to fractures in different locations.

As also shown in FIG. 3, the pitch (D1) of the fourth male thread (23) is greater than the pitch (D2) of the third male thread (22). In addition, the fourth end of the sleeve (2) may have a head (24) protruding outwardly to prevent the sleeve (2) from being completely buried in the bone. In addition, in order to provide a tool rotating sleeve (2), the head (24) may further be provided with a recessed hole (25), and the recessed hole (25) may be in the shape of a cross, a shape, a square, a triangle, or a star. But it is not limited to this.

Although FIG. 2 illustrates that the third male thread (22) and the fourth male thread (23) are discontinuous (ie, a non-threaded region therebetween), it can be understood that in other embodiments, The third male thread (22) and the fourth male thread (23) may also be continuous.

Although FIG. 2 illustrates that the female thread (21) does not extend from the third end inner wall to the fourth end inner wall (ie, the fourth end inner wall is a non-threaded area), it can be understood that in other embodiments The female thread (21) may also extend from the inner wall of the third end to the inner wall of the fourth end.

Referring to Fig. 4, the bone nail of the present embodiment is further described for use in a fracture of the tibia (S).

First, the bone nail is implanted from the surface of the tibia (I) through the pre-cut hole or the tapping tooth of the rod (1), so that the second male thread (12) of the rod body (1) is transmitted. The distal end of the humerus (S) is indirectly engaged with the humerus on the other side (F2), and the third male thread (22) of the cannula (2) engages the proximal humerus of the tibia (S) ( F1). At this time, the fourth male thread (23) is completely or partially outside the surface of the tibia (I). Next, the cannula (2) head (24) is rotated until the fourth male thread (23) is completely within the tibia (I) and the head (24) is against the tibia (I) surface. Since the pitch (D1) of the fourth male thread (23) is larger than the pitch (D2) of the third male thread (22), the tibia (I) and the tibia (S) can be rotated when the sleeve (2) is rotated (2). The proximal broken bone (F1) produces a relative displacement, which in turn pressurizes the ankle joint (J) between the tibia (I) and the tibia (S) for fusion. Then, continue to rotate the sleeve (2) head (24), at which time the first male thread (11) can move along the female thread (21) from the third end to the fourth end of the sleeve (2), thus The end fracture (F1) and the distal fracture (F2) will produce relative displacement and will be fixed.

In summary, when the bone nail of the present embodiment is used for the fracture of the tibia, not only the broken bone can be stably fixed, but also the ankle joint can be pressurized for fusion.

Although the present invention has been disclosed in the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art to which the present invention pertains can be modified in some ways without departing from the spirit and scope of the present invention. And the retouching, therefore, the scope of protection of this creation is subject to the request of the patent application scope attached.

(1)‧‧‧ rods

(11)‧‧‧First male thread

(12)‧‧‧Second male thread

(13)‧‧‧Tapping teeth

(2) ‧‧‧ casing

(21)‧‧‧Female thread

(22)‧‧‧ Third male thread

(23) ‧ ‧ fourth male thread

(24) ‧ ‧ head

(25)‧‧‧ recessed holes

(D1)‧‧‧pitch

(D2)‧‧‧pitch

(F1)‧‧‧ proximal broken bone

(F2) ‧‧‧ distal broken bone

(I) ‧ ‧ 髂 bone

(J)‧‧‧ Ankle joint

(S)‧‧‧骶骨骨

1 is a perspective view showing a bone nail of one embodiment of the present invention. Fig. 2 is a schematic cross-sectional view showing the rod body and the sleeve in the above nail. Figure 3 is a schematic cross-sectional view showing the two threads of the sleeve. Fig. 4 is a schematic view showing the use of the above nail for the fracture of the tibia.

Claims (11)

A bone nail comprising: a rod having a first male thread and a second male thread at its two ends; and a sleeve sleeved to the shaft and having a first end and a relative a second end of the first end, the first end inner wall is provided with a female thread for engaging the first male thread, the first end outer wall is provided with a third male thread, and the second end outer wall is provided with a fourth male thread The pitch of the fourth male thread is greater than the pitch of the third male thread, and the inner wall of the second end is in communication with the inner wall of the first end, so that the rod body can be selected from the first end of the sleeve. Ground to the second end. The nail according to claim 1, wherein the end of the rod body provided with the second male thread protrudes outwardly from a tapping tooth. The bone nail of claim 1, wherein the length of the first male thread of the shaft is equal to or greater than the length of the female thread of the sleeve. The bone nail of claim 1, wherein the third male thread and the fourth male thread are continuous. The bone nail of claim 1, wherein the third male thread and the fourth male thread are discontinuous. The bone nail of claim 1, wherein the second end of the sleeve protrudes outwardly from a head. The bone nail of claim 6, wherein the head is provided with a recessed hole. The bone nail of claim 7, wherein the concave hole has a shape of a cross, a shape, a square, a triangle, or a star. The bone nail of claim 1, wherein the female thread extends from the first end inner wall to the second end inner wall. The bone nail of claim 1, wherein the female thread does not extend from the first end inner wall to the second end inner wall. The bone nail of claim 1, wherein the surface of the shaft and the surface of the sleeve are treated by a porous coating.