TW201617039A - A bone screw for cable penetration - Google Patents

Abstract

Embodiments of a bone screw for cable penetration include three parts whose are a head section, a thread section and a conical section wherein the head section has a plurality of holes, the thread section is connected to the bottom of the head section and the surface of the thread section has a first tap. The conical section then is connected to the bottom of the thread section and has a pointed end. In addition, there is placed at least one cutting slot on the surface of the conical section, and the cutting slot is extended to the first tap of the thread section.

Description

Bone screw for cable threading

The present invention relates to a bone screw, and more particularly to a bone screw that facilitates cable penetration.

There are 206 adult bones, which are divided into four parts: skull, trunk bone, upper limb bone and lower limb. They are distributed throughout the body, and the bones of the human body support the body and protect the internal organs. The body's ability to make a variety of postures and movements is roughly dependent on the mutual interaction of bones, muscles and joints. Cooperate to complete.

All the bones of the human body vary in shape and size, and some are larger, such as the humerus, the tibia, etc., and some are relatively small, such as the phalanges. There are five types of bone shapes: long bones, short bones, flat bones, irregular bones, and gas-containing bones.

When the bone in the human body suffers from a fracture, the treatment method may be an open reduction internal fixation method, which is to cut the soft tissue of the skin and muscles of the fracture site, and expose the bone to facilitate the operation of the fracture and dislocation. . At the time of the open reduction, the internal fixator is simultaneously locked in the patient to complete the fixation of the fracture end. In addition, according to the fracture of different parts, the corresponding internal fixation method can also be adopted, and the corresponding internal fixation equipment such as bone plate, bone round needle, intramedullary nail (nail), screw, cable, stainless steel can be selected as needed. Silk and so on.

In the above-mentioned internal fixation device, the appearance of the screw is mostly a cylindrical groove having a concave-convex structure on the surface, and the screw can be locked to the bone plate and the bone by the screw structure.

However, sometimes due to loose screws fixed on the bone plate, the bone plate is usually loosened, the healing of the fracture site is slow, and even the bone plate implantation fails, so in order to avoid the above situation, some prior art will be in the bone. A number of perforations are placed on the plate, and when the bone plate is mounted on the fracture site, a plurality of stainless steel wires are used to pierce the perforations of the bone plate (as shown in the first figure), and then the bone plate and the bone are strengthened with stainless steel wire. Fixation, however, this method of strengthening the fixation, in addition to increasing the stress to increase the force per unit area of the bone plate, will also cause poor blood transport to the fracture site caused by periosteal compression. In addition, several fixations are applied to the bone plate. Perforation also destroys the original strength of the bone plate. Therefore, there is an urgent need to further develop The technique of strengthening the fixation of the bone plate makes the damaged fracture site have a good recovery after the operation.

In order to solve the above problems, unlike the prior art, the cable is threaded on the bone plate. The object of the present invention is to provide a bone screw which is convenient for cable threading, and has the advantages that it is not required to be used for drilling on the bone plate. The perforation of the cable is worn to reduce the processing cost when the bone plate is made, and the bone plate is also damaged by the stress, and the cable is modified to be placed on the bone screw. In addition, depending on the condition of the fracture site of the patient, it is determined whether or not the cable is threaded on the bone screw of the present invention to help avoid displacement of the bone plate fixed to the bone. If the bone screw of the present invention is not required to be specifically threaded to enhance the fixation between the bone plate and the bone depending on the fracture site of the patient, the bone screw of the present invention can also be locked by the fixing of the general bone screw. Above the bone plate.

In the first aspect of the present invention, the bone screw for facilitating cable insertion of the present invention comprises three parts, which are respectively a screw head, a threaded portion and a tapered portion, wherein the screw head has a plurality of perforations, and the thread portion Attached to the lower end of the screw head, and the surface of the threaded portion has a first thread. The tapered portion is connected to the lower end of the threaded portion and has a tip end. Further, at least one cutting groove is provided on the surface of the tapered portion, and the cutting groove extends to the first thread of the threaded portion. Wherein, the screw head, the threaded portion and the taper portion of the bone screw are integrally formed in sequence, and the plurality of perforations of the screw head can be used for laying a cable to facilitate fixing the bone screw on the bone plate.

In one embodiment, the screw head has four perforations, and the arrangement positions of the perforations are further bilaterally symmetric.

Preferably, each of the perforations has a diameter of 2.2 mm.

Preferably, the second thread is further provided on the outer surface of the screw head.

Preferably, the tapered portion is an inverted cone.

In an embodiment, the inner bottom of the screw head is provided with a locking groove, and the shape of the locking groove may further be hexagonal, cross or inline.

In the second aspect of the present invention, the present invention also provides a bone screw having a resistance to cable penetration, that is, the surface of the bone screw further has an anti-oxidation layer, which is prepared by using a blasting acid first. Washing to remove the surface layer of the bone screw, and then partially repairing the hole generated by the above-mentioned bone screw in the sand blasting by laser, and then grinding the surface of the bone screw to reduce the roughness of the surface of the screw, and then performing the surface Polishing, and finally modifying the surface, so that the surface of the bone screw has a wear-resistant anti-oxidation layer. In an embodiment, the bone screw material may be titanium alloy. Is a material of titanium or aluminum 6 vanadium (Ti6Al4V). In another embodiment, the bone screw material described above may be steel.

In one embodiment, the bone screw of the present invention can be used to fix bone plates of different fracture sites (eg, humerus, ulna, tibia, femur, etc.). In one embodiment, the size of the screw head and the taper of the bone screw can be maintained, but the threaded portion can be made to have an appropriate length according to the size of the different bones.

200‧‧‧ bone screw

202‧‧‧ screw head

204‧‧‧Threaded Department

206‧‧‧ Cone

208‧‧‧first thread

210‧‧‧Cutting trough

212‧‧‧ tip

216‧‧‧Perforation

314‧‧‧second thread

402‧‧‧ cable

502‧‧‧Lock groove

702‧‧‧ bone plate

704‧‧‧ bones

The embodiments of the present invention are illustrated by the examples in the following figures, and are not intended to limit the invention. Like reference numerals in the following drawings refer to like elements.

The first figure is a conventional bone plate that can be used for cable laying.

The second figure is a schematic view showing the structure of a bone screw which is advantageous for cable insertion according to an embodiment.

The third figure is a schematic view showing the structure of a bone screw which is advantageous for cable insertion according to another embodiment.

The fourth figure is a schematic view of the structure of the bone screw that is threaded.

The fifth figure is a structure of a bone screw head shown in accordance with an embodiment.

Figure 6A is a schematic view of the locking groove of the bone screw for facilitating cable threading in the first embodiment of the present invention.

FIG. 6B is a schematic view showing the locking groove of the bone screw for facilitating cable threading according to the second embodiment of the present invention.

The sixth C is a schematic view of the locking groove of the bone screw for facilitating cable threading according to the third embodiment of the present invention.

The seventh figure shows a bone screw of the present invention fixed to a bone plate according to an embodiment.

The eighth figure shows a bone screw that has been threaded on a bone plate according to another embodiment.

The embodiments of the present invention are described below by way of specific embodiments, and those skilled in the art can readily understand the utility of the present invention and its advantages by the disclosure of the present disclosure. The present invention may be applied and implemented by other specific embodiments. The details of the present invention may be applied to various needs, and various modifications or changes may be made without departing from the spirit and scope of the invention.

The present invention will be described in terms of the preferred embodiments and aspects of the invention, which are intended to illustrate and not to limit the scope of the invention. Therefore, the present invention may be widely practiced in other embodiments in addition to the preferred embodiments described in the specification.

The present invention is a bone screw 200 for facilitating cable insertion. Referring to the second figure, the bone screw further includes a screw head 202, a threaded portion 204 and a tapered portion 206, wherein the screw head has a plurality of perforations 216. The threaded portion 204 is coupled to the lower end of the screw head 202, and the surface of the threaded portion 204 has a first thread 208. The tapered portion 206 is coupled to the lower end of the threaded portion 204 and has a tip end 212. Further, at least one cutting groove 210 is disposed on the surface of the tapered portion 206, and the cutting groove 210 extends to the first thread 208 of the threaded portion 204. . The screw head 202, the threaded portion 204 and the tapered portion 206 of the bone screw of the present invention are integrally formed in sequence, and the plurality of through holes 216 of the screw head 202 can be used for threading to facilitate the fixation of the bone screw to the bone plate. on. In an embodiment, the third figure is a schematic view of a bone screw structure for facilitating cable insertion according to another embodiment, wherein the outer surface of the screw head 202 further has a second thread 314.

In some embodiments, the diameter of the screw head is larger than the diameter of the threaded portion and the tapered portion, and since the side surface of the screw head has the second thread 314, the bone screw is threaded on the bone plate by the above structure. And being fixed inside the bone, and screwed on the bone plate with a second thread screw, and the diameter of the threaded head is larger than the diameter of the thread portion to ensure that the identifiable bone screw is fixed inside the bone. In one embodiment, the length of the screw head and the taper of the bone screw can be maintained, but the threaded portion can be appropriately lengthened according to the size of the different bones.

In another embodiment, the fourth figure is an embodiment showing the threaded head 202 of the bone screw of the present invention threaded through the cable 402. The bone screw of the present invention can be directly used for embedding the perforation of the bone plate and the inside of the bone, and the screw head 402 of the bone screw can be penetrated by the cable 402, and the bone plate and the bone screw can be further strengthened and fixed. In one embodiment, a plurality of perforations 216 for the head portion 202 are used to thread the cable 402, each of which has a diameter of 2.2 mm.

In an embodiment, as shown in the fifth figure, the screw head portion of the bone screw has four perforations and the perforations are arranged in a bilaterally symmetrical manner and are opposite to each other for use in the cable. line. In another embodiment, each of the perforations has a diameter of 2.2 mm. In one embodiment, the inner side of the screw head is a hollow structure, and a locking groove 502 is disposed at the inner bottom of the screw head.

Please refer to FIG. 6A, FIG. 6B and FIG. 6C, which are schematic diagrams of the locking groove 502 of the bone screw for facilitating cable insertion according to the first to third embodiments of the present invention; As shown in the figure, the top of the bone screw of the present invention is a screw head, and a bottom of the screw head is provided with a locking groove, so that the bone screw is conveniently locked on the bone plate and the bone, and the locking groove is It is a hexagonal structure (such as Figure 6A), but the locking groove is not limited to the hexagonal shape, but also can be a cross type (such as the sixth B picture), a word type (sixth Figure C or various polygonal structures allow the operator to insert the corresponding locking tool into the locking groove and secure the bone screw to the bone and bone plate.

In an embodiment, the bone screw material may be made of titanium metal or titanium 6 aluminum 4 vanadium (Ti6Al4V). In another embodiment, the bone screw material described above may be steel.

As shown in the second figure, the bottom of the bone screw of the present invention is a tapered portion, wherein the tapered portion is an inverted cone, and the tapered portion has a tip end which can be used to cut through the hard bone of the bone surface; At least one cutting groove is provided on the surface of the tapered portion, and the cutting groove can be used to enhance the strength of the cutting and the bone screw of the embodiment of the present invention is fixed to the hard bone by the cutting groove.

As shown in the seventh figure, the bone screw 200 of the present invention fixed to the bone plate 702 is shown in accordance with an embodiment. When the operator puts the bone screw through the perforation of the bone plate, the corresponding screw is inserted into the locking groove of the screw head to make the taper of the bone screw and the at least one cutting groove penetrate the hard bone of the bone 704. In part, the threaded portion 204 is mostly immersed in the interior of the bone 704, and the second thread 314 of the screw head is screwed onto the bone plate 702 to complete the fixation of the bone plate 702 on the bone 704.

In one embodiment, when the operator decides to reinforce the bone plate fixed to the bone depending on the severity of the fracture site of the patient, the cable can be wrapped around the bone according to an embodiment as shown in FIG. After the bone plate passes through the perforation of the screw head 202 of the bone screw 200, the cable 402 is fixed. In one embodiment, the above-mentioned fixing manner can enhance the stability of the bone screw 200 fixed on the bone plate 702 in the embodiment of the present invention, and the bone plate 702 can also be locked on the bone 704. In one embodiment, the bone screw 200 of the present invention can be applied to a bone plate 702 that fixes different fracture sites (eg, humerus, ulna, tibia, femur, etc.) and can be threaded through the screw 402 to thread the screw of the bone screw 200. The portion 202 is further reinforced.

In the embodiment of the present invention, it is not necessary to drill a hole for piercing the cable on the bone plate, and the advantage of the invention is that the processing cost of the bone plate can be reduced, and the bone plate can be prevented from being weakened by its own strength. Damaged by stress. In an embodiment, the cable material may be made of titanium metal or titanium 6 aluminum 4 vanadium (Ti6Al4V). In another embodiment, the cable material described above may be steel. In an embodiment, since the material of the bone screw and the cable is made of titanium metal or titanium 6 aluminum 4 vanadium (Ti6Al4V), it should not cause an allergic reaction in the human body after being implanted into the human body.

The above description is a preferred embodiment of the invention. Those skilled in the art should be able to understand the invention and not to limit the scope of the patent claims claimed herein. The scope of patent protection is subject to the scope of the patent application and its equivalent fields. Anyone who is familiar with this field, Modifications or modifications made by the spirit of the present invention are intended to be included within the scope of the appended claims.

200‧‧‧ bone screw

202‧‧‧ screw head

204‧‧‧Threaded Department

206‧‧‧ Cone

208‧‧‧first thread

210‧‧‧Cutting trough

212‧‧‧ tip

216‧‧‧Perforation

Claims (10)

A bone screw for facilitating cable threading, comprising: a screw head having a plurality of perforations; a threaded portion connected to a lower end of the screw head, having a first thread on a surface of the threaded portion; And a tapered portion connected to the lower end of the threaded portion, the lower end of the tapered portion has a tip end, and at least one cutting groove is disposed on the surface of the tapered portion and extends to the first thread; wherein the screw head, The threaded portion and the tapered portion are integrally formed in sequence, and the plurality of perforations can be used to thread the cable to facilitate fixing the bone screw to the bone plate. A bone screw for facilitating cable insertion as described in claim 1 wherein the screw head has 4 perforations. The bone screw for facilitating cable insertion as described in claim 2, wherein the position of the perforation of the screw head is bilaterally symmetric. A bone screw for facilitating cable penetration as described in claim 1 or 2 or 3, wherein the diameter of the screw head perforation is 2.2 mm. The bone screw for facilitating cable insertion according to claim 1, wherein the outer surface of the screw head further has a second thread. The bone screw for facilitating cable insertion according to claim 1, wherein the diameter of the screw head is larger than the diameter of the threaded portion and the tapered portion. The bone screw for facilitating cable insertion according to the first aspect of the patent application, wherein the inner bottom of the screw head is provided with a locking groove. The bone screw for facilitating cable threading according to Item 7 of the patent application, wherein the locking groove is hexagonal, cross or inline. The bone screw for facilitating cable insertion according to the first aspect of the patent application, wherein the cone is inverted Cone. The bone screw for facilitating cable insertion according to the first aspect of the patent application, wherein the bone screw is made of steel, titanium or titanium 6 aluminum 4 vanadium (Ti6Al4V).