TWM454823U - Screws structure having cutting slot - Google Patents

Description

Screw structure with cutting groove

The present invention is a screw structure, in particular a screw structure in which a cutting groove is provided on a tapered portion without extending to a cutting groove of a screw portion.

Screws are a common type of fixing element. They are commonly used in machinery, electrical appliances, and buildings. They are made of metal or plastic. They are cylindrical in appearance and the grooves with irregularities on the surface are called threads. This thread is a helically inclined surface around the side of the screw that allows the screw to lock the screw cap or other object with a screw mechanism.

Screws can also be used in the field of medical equipment. These screws used to lock bone plates are called bone nails. The purpose is to stably fit and fix the bone plate to the surface of the injured bone to assist them. recovery.

However, when the general bone plate is fixed to the bone by screwing, the bone nail must be passed through the two layers of hard bone (Cortex), because if it is only fixed by locking a layer of hard bone and cancellous bone, that is, letting the bone If the nail does not penetrate the injured bone, the fixation effect is not good and it is easy to put out.

Even if the two layers of hard bone penetrated, the existing screw on the structure, the cutting groove opened on the tapered cone of the screw, although it helps the screw to break into the bone, it affects its fixation. The ability of the cutting groove to extend the length of the cutting groove is reduced, which reduces the contact area with the hard bone and reduces the fixing effect.

For example, the bone plate screw disclosed in U.S. Patent Publication No. 20070083206 has a plurality of cutting grooves extending to the screw teeth in the taper portion of the screw, so that the screw teeth reach the injured bone of the injured person as described above. Will reduce the area of contact with the hard bone due to the presence of the cutting groove.

In addition, in the new model patent D136430 of the Republic of China, the tapered end portion of the structure has a tapered shape at the lower end of the structure, and a spiral cutting groove is opened from the bottom of the nail tip portion to make the cutting groove phase The notched thread should be shaped as a sharp jagged. In this patent document, the screw structure disclosed therein still has an excessively long cutting groove, and thus there is room for improvement in the fixing ability when applied to fixing the bone plate.

The main purpose of the present invention is to provide a screw structure having a cutting groove, which has a tapered groove at the bottom of the screw, and defines the cutting groove to extend only upward to the first thread without continuing upward Open to other threaded teeth.

The second objective of the present invention is to provide a screw structure with a cutting groove for fixing a bone plate on a bone, and the cutting groove thereof is almost outside the bone due to the taper of the screw penetrating the bone, so It will affect the contact area between the screw and the bone of the screw, thus strengthening the fixing ability of the screw.

Another object of the present invention is to provide a screw structure having a cutting groove which is a self-tapping screw which enhances the ability to break into a bone by opening a cutting groove.

In order to achieve the above object, the present invention discloses a screw structure having a cutting groove, comprising: a screw portion; a threaded portion on a surface of the screw portion, having a first thread, the first thread Is located at one end of the threaded portion; a taper portion is located below the screw portion, one end of which is connected to the first screw, and the other end has a tip end; and at least one cutting groove is formed in the taper portion a surface, and the cutting groove is formed between the first screw and the tip. In this way, when the medical staff uses the screw to fix the bone plate on the injured bone, the stability of the bone plate can be ensured without any deviation, shaking or falling off.

1‧‧‧ screw department
2‧‧‧Threading Department
21‧‧‧First thread
21L‧‧‧Width
22‧‧‧Second thread
23‧‧‧ Third thread
3‧‧‧ Cone
31‧‧‧ tip
4‧‧‧Cutting trough
4D‧‧‧depth
5‧‧‧ crown
51‧‧‧Lock groove
6‧‧‧ bone plate
61‧‧‧ bone plate perforation
7‧‧‧hard bones
8‧‧‧cancellous bone

The first picture: it is the structure diagram of the creation;
The second picture: it is another structural diagram of the creation;
The third picture: it is a partial enlarged structure diagram of the creation;
The fourth picture: the schematic diagram of the fixed bone plate on the bone of the creation; and the fifth picture: the structure diagram of the creation of the ability to further strengthen the fixation between the bone plate and the bone plate.

For a better understanding and understanding of the features of the creation and the efficacies achieved, please refer to the preferred examples and detailed explanations as follows:

First, please refer to the first figure, which is a structural analysis of the present invention, which comprises a screw portion 1, a threaded portion 2, a tapered portion 3, at least one cutting groove 4 and a crown portion 5. Wherein, in the mutual connection relationship, the screw portion 1 is a main body of the structure, and has a crown portion 5 thereon; the thread portion 2 is located on the surface of the screw portion 1; the taper portion 3 is located below the screw portion 1; The cutting groove 4 is formed on the surface of the tapered portion 3.

In the present creation, the screw portion 1 has a long cylindrical shape, so that it can penetrate the screw hole of the object to be locked, and further penetrate or penetrate the object for reinforcement fixing according to its length.

The threaded portion 2 is located on the surface of the screw portion 1, and the screw type is classified into a half tooth or a full tooth depending on the ratio to which it is covered. However, whether it is a half-tooth screw or a full-tooth screw, the threaded portion 2 covers the lower end of the screw portion 1 to ensure that the screw can break into the object.

In the present invention, the threaded portion 2 has a first thread 21, and the first thread 21 is located at one end of the threaded portion 2 so that the first thread 21 is located at the end of the screw portion 1 below. That is, the thread structure of the present invention that first contacts the object when used for locking. Further, along the screw portion 1, above the first screw 21, a second screw 22 is integrally formed with the first screw 21, and spirally wound upwardly around the screw portion. The surface of 1 enables the threaded portion 2 to be rotated into the object according to the female thread previously embedded in the object using the self-tapping tool, or to directly attack the object for a self-tapping screw.

The lower portion of the screw portion 1 is a tapered portion 3 which is an inverted cone whose wider end is connected to the screw portion 1 and thus to the first screw 21; the other end is A tip 31, which is the lowest point of the creation.

The second figure shows the locking groove 51 of the crown 5, which is not limited to the hexagonal shape, and may also be a straight shape, a cross shape or a square shape, so that the operator can rotate using the corresponding tool. Screw. In addition, the diameter of the crown portion 5 is larger than the diameter of the screw portion 1, so that the creation of the structure is slightly wide and narrow, so as to ensure the diameter of the crown can be ensured when the bone plate is penetrated and fixed to the bone surface. Its ability to be fixed to the surface.

The screw structure of the cutting groove of the present invention is used for the locking and fixing of the bone plate, and when the bone plate is generally fixed on the bone through the bone screw, the bone nail must pass through the two layers of hard bone, so the creation The design of the cutting groove 4 enhances the effect of locking.

Referring to the enlarged view of the third figure, the cutting groove 4 in the present invention is opened on the surface of the tapered portion 3, and the cutting groove 4 is also opened between the first screw 21 and the tip 31, and the direction thereof is It is parallel to the screw portion 1, but it does not continue to extend upward to the second thread 22. Here, through the cutting groove 4, not only can the conventional cutting groove effect be provided, but the screw can be tapped into the bone, and on the other hand, since the length of the cutting groove 4 is short, it is almost outside the hard bone (Cortex) on the opposite side of the bone plate. Therefore, relative to the tip end of the screw, the thread and the screw area which can be locked in the contralateral hard bone are increased, and the locking effect is enhanced.

In addition, the groove depth 4D of the cutting groove 4 in the present invention is also controlled, which is equal to or smaller than the width 21L of the first screw 21, which is also to ensure that the cutting groove 4 does not open too deep and affects the hard The contact area between the bone and the screw is reduced to maintain its ability to lock.

Please refer to the fourth figure, which is a schematic cross-sectional view of the bone plate on the bone. The present invention is a self-tapping screw in this embodiment, that is, it is not necessary to pre-thread the lock member, but the lock member is locked while the thread is tapped on the lock member, thereby Fix yourself on the locked piece. Under the condition that human bones are not suitable for being drilled beforehand, this creation must be prepared in the form of self-tapping screws.

As shown in the fourth figure, when the creation passes through the perforation 61 of the bone plate opened on the bone plate 6, it then penetrates the hard bone 7 near the surface of the bone, and then penetrates the cancellous bone 8 near the inner layer of the bone, and finally Then, the hard bone 7 on the other side of the bone penetrates out. Here, when the taper portion 3 breaks out of the bone, the cutting groove 4 is only located in the tapered portion 3 and does not extend to the screw portion 1, so the cutting groove 4 Almost completely outside the hard bone 7, while the threaded portion 2 engaged with the hard bone 7 is a complete structure, so the conventional screw structure extending to the second screw 22 than the cutting groove 4 (not shown) Have a stronger locking ability.

Finally, please refer to the fifth figure, which is to further strengthen the fixing and jointing ability between the screw and the bone plate. Therefore, the structure of the third screw 23 is further provided at the position of the crown 5, which is transmitted through The thread formed by the third thread 23 is interlocked with the bone plate perforation 61 of the bone plate 6, and the two are adhered to each other to have a high strength fixing ability, which is a locking screw; in other words, a locking screw; This creation is not limited to the combination of a general type of screw and bone plate.

In summary, the screw structure of the cutting groove of the present invention defines the position and size of the cutting groove, except that the self-tapping screw provided by the cutting groove can be used to cut off excess blocks when milling into the bone, similar to a milling cutter. Function; at the same time, the extension length of the cutting groove is not excessive, so that the contact area between the bone and the screw is improved, thereby improving the locking ability. Accordingly, this creation should be a practical value of the screw structure of the cutting groove.

However, the above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and the variations, modifications, and modifications of the shapes, structures, features, and spirits described in the scope of the patent application. , should be included in the scope of the patent application of this creation.

1‧‧‧ screw department

2‧‧‧Threading Department

21‧‧‧First thread

22‧‧‧Second thread

3‧‧‧ Cone

31‧‧‧ tip

4‧‧‧Cutting trough

5‧‧‧ crown

Claims (8)

A screw structure having a cutting groove, the system comprising:
a screw portion;
a threaded portion on the surface of the screw portion, having a first thread, the first thread is located at one end of the threaded portion;
a taper portion located below the screw portion, one end of which is connected to the first screw, and the other end has a tip end; and at least one cutting groove is formed on the surface of the taper portion, and the cutting groove is formed in the Between the first thread and the tip. The screw structure of claim 1, wherein the cutting groove is parallel to the screw portion. The screw structure of claim 1, wherein the screw portion further comprises a second thread, the second thread is connected to the first thread along the screw portion, and is located at the first Above the thread. The screw structure of claim 1, further comprising a crown portion located above the screw portion. The screw structure of claim 4, wherein the crown has a diameter larger than a diameter of the screw portion, and the crown portion is threaded through the perforation of the bone plate of one of the bone plates. The screw structure of claim 5, wherein the crown further has a third thread that is interlocked with the perforation of the bone plate. The screw structure of claim 4, wherein the crown has a locking groove. The screw structure of claim 1, wherein the depth of the cutting groove is equal to or smaller than a width of one of the first threads.