TWM647747U - A bone screw facilitating cable passing - Google Patents

Abstract

A bone screw facilitating cable passing, which includes a screw head consisting of a cown structure and a thread structure, wherein the crown structure contains at least a pair of perforations for passing cables to fix the bone screw to a bone plate, the outer surface of the thread structure has a first thread.

Description

A bone screw that facilitates cable threading

This invention relates to the technical field related to medical bone screws, especially a bone screw that facilitates the threading of cables.

There are 206 adult bones, which are divided into four parts: skull, trunk bones, upper limb bones, and lower limb bones. They are distributed in various parts of the body. The bones of the human body play a role in supporting the body and protecting internal organs. The reason why the body can make various postures and movements generally depends on the interaction between bones, muscles and various joints. Match to complete.

All bones in the human body vary in shape and size. Some are larger, such as tibia, humerus, etc., while some are smaller, such as phalanges, etc. According to the shape of bones, they can be divided into five types: long bones, short bones, flat bones, irregular bones and air-containing bones.

When the above-mentioned bones in the human body suffer from fractures, the treatment method can be open reduction and internal fixation. The method is to cut the skin and muscles and other soft tissues at the fracture site to expose the bones, which facilitates surgery to repair the fractures and dislocations. . During open reduction, the internal fixator is locked in the patient's body to complete the fixation of the fracture end. In addition, depending on the fractures at different locations, relative fractures can also be used Corresponding internal fixation methods, and select corresponding internal fixation equipment as needed, such as bone plates, bone needles, intramedullary needles (nails), screws, cables, stainless steel wires, etc.

Among the above-mentioned internal fixation devices, the screws are mostly cylindrical in appearance and have threaded grooves with a concave and convex structure on the surface, and the screws can use this threaded structure to lock onto the bone plate and bone.

However, sometimes the screws fixed to the bone plate loosen, which usually causes the bone plate to loosen, resulting in slow healing of the fracture site and even failure of bone plate implantation. Therefore, in order to avoid the above situation, some previous technologies will install the bone plate on the bone. Several perforations are made on the plate. After the bone plate is installed at the fracture site, several stainless steel wires (or titanium alloy cables) are used to pass through the perforations of the bone plate (as shown in Figure 1), and then the stainless steel wires are used. (or titanium alloy cables) to strengthen the fixation of the bone plate and the bone. However, this method of strengthening the fixation will not only increase the stress to increase the force per unit area of the bone plate, but also pressurize the periosteum and cause the fracture site. Poor blood transportation; in addition, making several perforations in the bone plate will also destroy the original strength of the bone plate.

Based on the above deficiencies, there is an urgent need to further develop technology suitable for strengthening bone plate fixation so that the damaged fracture site can recover well after surgery.

In order to solve the above problems, unlike the conventional technology of threading cables on the bone plate, the purpose of this invention is to provide a bone screw that facilitates the threading of cables, including: a screw head, including a crown structure and a thread structure. Composition, wherein the coronal structure includes at least one pair of holes for passing cables to fix the snail Nailed to the bone plate, the outer surface of the threaded structure has a first thread, and the inner bottom surface of the coronal structure has a star-shaped locking groove.

In one embodiment, the above-mentioned bone screw further includes a threaded portion connected to and extending from the lower end of the threaded portion to form a second thread on the surface of the threaded portion; and a tapered portion forming the lower end of the threaded portion. The tapered portion It has a tip, and at least one cutting groove is formed on the surface of the cone portion and extends to the second thread.

In one embodiment, the at least one pair of perforations is two perforations, and the positions of the at least one pair of perforations are symmetrical.

In one embodiment, the diameter of the through hole in the screw head ranges from 1.0 to 2.0 mm.

In one embodiment, the diameter of the screw head is larger than the diameter of the threaded part.

In one embodiment, the diameter of the screw head is larger than the diameter of the cone portion.

In one embodiment, the star-shaped locking groove includes an inverted cone body.

In one embodiment, the locking groove includes at least four channel-like structures surrounding the conical body.

In one embodiment, the number of the channel-shaped structures is six.

In one embodiment, the bone screw is made of steel, titanium or titanium 6 aluminum 4 vanadium (Ti6Al4V).

200:Bone Screw

202: screw head

202a: Crown structure

202b:Thread structure

204:Thread part

206: Taper

216:Perforation

208:Second thread

212: Tip

210:Cutting groove

214:First thread

302:Cable

410: Locking groove

410a: Inverted cone body

410b: Channel-like structure

502:Bone plate

504: Bones

[Figure 1] shows a conventional bone plate that can be used for cable routing.

[Figure 2A] shows the two external structures of the bone screw proposed in this invention that facilitate cable penetration.

[Figure 2B]-[Figure 2C] shows a schematic diagram of a bone screw structure that facilitates cable penetration according to an embodiment of the present invention.

[Figure 3] Schematic diagram showing the structure of bone screws passed through cables

[Figure 4A]-[Figure 4C] shows a detailed schematic diagram of the screw head of a bone screw that facilitates cable penetration.

Figure 5 shows a schematic diagram of bone screws fixed on a bone plate according to an embodiment of the present invention.

Figure 6 shows a schematic diagram of a bone screw with a cable passed through the bone plate according to an embodiment of the present invention.

The following describes the implementation of the present invention through specific embodiments. Those familiar with this technology can easily understand the effects and advantages of the present invention through the contents of this description. Moreover, this invention can also be used and implemented through other specific embodiments. Various details described in this specification can also be applied based on different needs, and various modifications or changes can be made without departing from the spirit of this invention.

This invention will be described with preferred embodiments and viewpoints. Such descriptions explain the structure of this invention and are only used to illustrate but not limit the patentable scope of this invention. Therefore, in addition to the preferred embodiments in the specification, the present invention can also be widely implemented in other embodiments.

This invention is a bone screw 200 that is convenient for cable penetration. This invention provides two shapes, as shown in Figure 2A. The bone screw 200 shown in the left and right pictures of Figure 2A both includes a screw head 202. , threaded part 204 and tapered part 206, the difference between the two shapes is the crown structure 202a of the screw head; in the left picture of Figure 2A, the crown structure 202a of the screw head presents a cone-shaped structure that expands from the top to the waist, and Figure In the right picture of 2A, the crown structure 202a of the screw head presents a cylindrical structure from the top to the waist.

For ease of explanation, all the following figures only use the bone screw 200 shown in the left picture of FIG. 2A as an example. Referring to FIGS. 2B-2C , FIG. 2B is a front view of the bone screw 200 , and FIG. 2C is a side view of the bone screw 200 . The above-mentioned bone screw includes a screw head 202, a threaded portion 204, and a tapered portion 206. The screw head 202 (including a crown structure 202a and a threaded structure 202b) has a plurality (2) through holes 216, and the threaded structure 202b There is a first thread 214 on the outside; the thread portion 204 extends from the lower end of the screw head 202 extends, and the surface of the threaded portion 204 has a second thread 208; the tapered portion 206 is formed at the lower end of the threaded portion 204 and has a tip 212. In addition, at least one cutting groove 210 is provided on the surface of the tapered portion 206 , and the cutting groove 210 extends to the second thread 208 of the threaded portion 204 .

2B-2C, the screw head 202, threaded part 204 and cone part 206 of the bone screw 200 of the present invention are integrally formed in sequence, and the plurality (2) through holes 216 of the screw head 202 can be used to pass cables. , to facilitate the strengthening and fixation of bone screws to the bone plate. The diameter of the screw head 202 is larger than the diameter of the threaded portion 204 and the tapered portion 206, and since there is a first thread 214 on the outer surface of the thread structure 202b of the screw head 202, the above-mentioned structure is used to penetrate the bone screw into a bone plate. And it is fixed inside the bone, and is screwed and locked on the above-mentioned bone plate with the first thread 214, and the diameter of the screw head 202 is larger than the diameter of the threaded part 204 to ensure that it can be recognized that the bone screw is fixed inside the bone. In one embodiment, the length of the screw head 202 of the bone screw 200 can remain unchanged, but the threaded portion 204 and the tapered portion 206 can have appropriate lengths according to the sizes of different bones. For example, in a special case, the threaded portion 204 The taper portion 206 can be omitted, and only the screw portion 202 (including the crown structure 202a and the thread structure 202b) is retained.

In one embodiment, FIG. 3 shows an embodiment showing a cable 302 passing through the screw head 202 of the bone screw of the present invention. The bone screw of the present invention can be directly inserted into the bone plate through hole and inside the bone. The cable 302 can also be used to penetrate the screw head 202 of the bone screw to further strengthen the fixation of the bone plate and bone screw. In one embodiment, in order to allow the plurality (2) through holes 216 of the screw head 202 to be used for passing the cable 302, the diameter of each through hole ranges from 1.0 to 2.0 mm.

In one embodiment, the structure of the bone screw head 202 is shown in Figures 4A-4C. Figure 4A is a perspective view of the bone screw head 202. Figure 4B is a top view of the bone screw head 202. Figure 4B is Front view of bone screw head 202.

The screw head 202 of the bone screw has two through holes 216, and the arrangement of the through holes is symmetrical and opposite to each other for passing cables. In one embodiment, referring to FIG. 4C , the diameter of each through hole 216 ranges from 1.0 to 2.0 mm. In one embodiment, referring to FIG. 4B , the inside of the above-mentioned screw head 202 is a hollow structure, and a locking groove 410 is provided at the bottom of the inside of the screw head.

Please refer to Figures 4A-4C together. As shown in the figures, the top of the bone screw of the present invention is a screw head 202, and a locking groove 410 is provided at the inner bottom of the screw head so that the bone screw can be easily locked to the bone. On the plate and bone, the above-mentioned locking groove 410 is a star-shaped structure (as shown in Figure 4B), which includes an inverted cone body (as the groove body) 410a and a plurality of channel-like structures 410b, so that the operator can correspond The tool is inserted into the locking groove 410 and locks the bone screw on the bone and bone plate.

In one embodiment, the number of the plurality of channel structures 410b is at least four, and a preferred number is six.

In one embodiment, the bone screw material can be titanium metal or titanium 6 aluminum 4 vanadium (Ti6Al4V). In another embodiment, the material of the above-mentioned bone screw can be steel.

As shown in Figures 2B-2C, the bottom of the bone screw 200 of the present invention is a cone portion 206, wherein the above-mentioned cone portion 206 is an inverted cone, and the cone portion has a tip that can be used to drill through the hard surface of the bone. In addition, at least one cutting groove 210 is provided on the surface of the tapered portion 206. The cutting groove 210 can be used to enhance the cutting strength and to fix the bone screw 200 of the present embodiment on the hard bone.

As shown in FIG. 5 , a bone screw 200 of the present invention fixed on a bone plate 502 is shown according to an embodiment. After the operator inserts the bone screw into the perforation of the bone plate, he inserts the corresponding tool into the locking groove of the screw head and twists it, so that the tapered part of the bone screw and at least one cutting groove penetrate the hard bone of the bone 504 part, and the threaded portion 204 is mostly submerged inside the bone 504, and the second thread 208 of the screw head is screwed and locked on the above-mentioned bone plate 502 to complete the fixation of the bone plate 502 on the bone 504.

In one embodiment, when the operator decides to further strengthen the bone plate fixed on the bone depending on the severity of the patient's fracture site, he or she can wrap the cable around the bone and bone according to an embodiment as shown in Figure 6 . The plate is passed through the hole of the screw head 202 of the bone screw 200, and then the cable 302 is fixed. In one embodiment, the above fixation method can not only enhance the stability of the bone screw 200 fixed on the bone plate 502 in this creative embodiment, but also lock the bone plate 502 on the bone 504. In one embodiment, the bone screw 200 of the present invention can be used to fix the bone plate 502 of different fracture parts (such as humerus, radius, tibia, femur, etc.), and the cable 302 can be passed through the screw head of the bone screw 200 Part 202 is further strengthened and fixed.

In the embodiment of the present invention, there is no need to drill holes in the bone plate for passing cables. This has the advantage of not only reducing the processing cost when making the bone plate, but also preventing the bone plate from weakening due to its own strength and Destroyed by stress. In one embodiment, the above-mentioned cable material can be titanium metal or Material of titanium 6 aluminum 4 vanadium (Ti6Al4V). In another embodiment, the material of the above-mentioned cable can be steel. In one embodiment, since the bone screws and cables are made of titanium metal or titanium 6 aluminum 4 vanadium (Ti6Al4V), they should not cause allergic reactions in the human body after being implanted into the human body.

The above description is the preferred embodiment of this invention. Those skilled in the art should understand that it is intended to illustrate rather than limit the scope of the patent rights claimed for this invention. The scope of patent protection shall depend on the appended patent application scope and its equivalent fields. Any changes or modifications made by those who are familiar with the art in this field without departing from the spirit or scope of this patent shall be equivalent changes or designs completed within the spirit disclosed in this creation, and shall be included in the following patent application scope. within.

200:Bone Screw

202: screw head

202a: Crown structure

204:Thread part

206: Taper

Claims (10)

A bone screw that facilitates the penetration of cables, including: a screw head, including a crown structure and a thread structure formed on the outside of the crown structure, wherein the crown structure includes at least one pair of through holes for threading cables and fixing the bone The screw is attached to the bone plate, the outer surface of the threaded structure has a first thread, and the inner bottom surface of the coronal structure has a star-shaped locking groove. The bone screw that facilitates cable penetration as described in claim 1 further includes: a threaded portion connected to and extending from the lower end of the screw head to form a second thread on the surface of the threaded portion; and a tapered portion forming the threaded portion. At the lower end of the threaded portion, the tapered portion has a tip, and at least one cutting groove is formed on the surface of the tapered portion and extends to the second thread. The bone screw that facilitates cable penetration as described in claim 1, wherein the at least one pair of perforations is two perforations, and the positions of the at least one pair of perforations are left and right symmetrical. The bone screw that facilitates cable penetration as described in claim 3, wherein the diameter of the hole in the screw head ranges from 1.0 to 2.0 mm. The bone screw that facilitates cable threading as described in claim 2, wherein the diameter of the screw head is larger than the diameter of the threaded part. The bone screw that facilitates cable threading as described in claim 2, wherein the diameter of the screw head is larger than the diameter of the cone portion. The bone screw that facilitates cable threading as described in claim 1, wherein the star-shaped locking groove includes an inverted cone body. The bone screw that facilitates cable penetration as described in claim 7, wherein the locking groove includes at least four channel-like structures surrounding the vertebral body. The bone screw that facilitates cable penetration as described in claim 8, wherein the number of the above-mentioned channel-like structures is six. The bone screw that facilitates cable threading as described in claim 1, wherein the bone screw is made of steel, titanium or titanium 6 aluminum 4 vanadium (Ti6Al4V).