TWM479112U - Sleeve type bone screw - Google Patents

Description

Cannulated bone screw 【0001】

The present invention relates to a bone screw, which particularly relates to a sleeve which is arranged on the nail body of the bone screw, and the nail body and the sleeve are placed in the cortical bone, and the sleeve is used to maintain the nail body and can be used for small shaking. A cannulated bone screw that promotes the growth of the epiphysis and accelerates the healing of the fracture.

【0002】

Fracture refers to the phenomenon that the bone is broken or broken due to direct or indirect external force. External force usually causes damage to bone cells, blood vessels and interstitial bones at the fracture site, and even damages the periosteum or muscle tissue around the bone.

[0003]

Fracture healing must go through a series of processes of inflammation, repair, and reshaping: the fracture first enters the inflammatory response period. Initially, the fracture site will develop hematoma due to hemorrhage. The hematoma will be within six to eight hours after the injury. Gradually condensed into blood clots containing reticular fibers. The fractures damage the inner periosteum and the periosteum, causing the local blood flow supply to be interrupted, resulting in poor blood supply near the fracture site, necrosis of surrounding cell tissue, and clots of blood clots and necrotic tissue. The site causes a local aseptic inflammatory reaction. The inflammatory mediator released from the necrotic tissue can cause vasodilation and increased vascular permeability, so that the immune cells can enter the fracture site, and the plasma can also ooze out of the blood vessel and cause local edema. Capillaries can be newly introduced into the fracture site by the initiation of vascular endothelial cells, and phagocytic cells and fibroblasts also merge into the granulation tissue, which is then transformed into fibrous tissue, fibrous tissue formed by fibrous tissue. Filled between the broken bones of the fracture site, the fracture ends are initially connected together. The process of inflammatory reaction takes about two to three weeks to complete.

[0004]

The repair of the fracture site takes four to eight weeks, including intra-articular ossification, external epiphysis formation, and internal callus formation. The intra-chondral ossification refers to the transformation of the fibrous tissue into the fracture site to replace the hematoma, and The process of ossification and bone formation through hyperplasia, degeneration, calcification, etc.; the formation of external epiphysis is also called intraosseous ossification, and the osteoblasts contained in the outer periosteum that are damaged by the fracture grow and form external epiphyses. It begins within 24 hours after the fracture, and a new bone can be grown about one week later. The new bone is placed close to the surface of the cortical bone and filled between the fracture ends; the internal epiphysis is composed of the endocardium and bone marrow of the bone marrow cavity. The cells are formed and filled between the medullary cavities at the fracture end. The internal osteophytes are internal and the blood supply is poor, so the growth is slow.

[0005]

At the beginning of the repair reaction, the broken end of the broken bone is in a high stress environment, and the formation of the accelerated fiber structure causes the stress on the broken end to gradually decrease. When the broken end is in a medium pressure and medium oxygen concentration environment, it can be accelerated. The process of fiber tissue differentiation to form cartilage, the fibrous epiphysis formed by fibrocartilage is filled and filled between the two segments of the bone, which can further reduce the stress at the fracture site and promote the ossification of the cartilage. When the fracture site is due to angiogenesis and bone When the sputum is filled and is in a high oxygen concentration and low stress environment, it will cause a large number of osteoblasts to proliferate and form immature bone, and promote the periosteal ossification. The internal and external epiphyses will be calcified to a sufficient strength to resist muscles. Various shearing and rotating forces caused by shrinkage.

[0006]

The last stage of fracture healing is the remodeling stage. After the remodeling process, the immature bone is transformed into mature bone. During this process, the osteoclast destroys and reabsorbs the immature bone, and the osteoblast enters the gap and matures. Bone, and finally, by replacing the immature bone with mature bone, the osteophytes at the fracture can be transformed into normal cortical and medullary states, and the process of bone remodeling is completed. It takes about one to two years for a child to undergo a remodeling process after a fracture, and an adult for about two to four years.

【0007】

Please refer to the first figure, which is a schematic diagram of the state of use of the conventional bone screw; as shown in the first figure, the conventional bone screw 10 includes the nail head 100 and the nail body 102, when the bone plate 2 is placed off. Above the bone 3, when the bone screw 10 penetrates the bone nail hole 20 of the bone plate 2, the nail body 102 passes through the hole 300 and the bone marrow 32 drilled in the cortical bone 30 at the top of the broken bone 3, and is locked at the bottom of the broken bone 3 Within the cortical bone 30, the nail head 100 is then locked in the nail hole 20. Wherein, the nail head 100 is screwed by a first male thread 1000 of the outer edge thereof with a first female thread 200 of the inner edge of the nail hole 20, and the nail body 102 is extended by a second male thread 1020 extending from the tip end thereof. Locked in the cortical bone 30.

[0008]

The conventional bone screw 10 can fix the bone plate 2 on the surface of the broken bone 3, and since the bone cortex 30 of the broken bone 3 is provided with a hole 300, after the bone screw 10 is installed, the nail body 102 can still be shaken by a small amount to stimulate Osteophytes grow. However, as the epiphysis grows, the hole 300 will heal, so that the nail body 102 cannot be shaken, and the fiber tissue that stimulates the fracture site is lost, differentiates into cartilage, and forms an osteophyte.

【0009】

In view of this, the present invention proposes a cannulated bone screw comprising a bone screw and a cannula sheathed on the bone screw body portion, and the cannula structure embedded in the cortical bone hole prevents the hole from healing prematurely and maintains The nail body can perform a small amount of shaking space, and the nail body of the bone screw can cause moderate stimulation to the fracture site to promote the growth of the epiphysis.

[0010]

The main purpose of the present invention is to provide a cannulated bone screw, the sleeve is sleeved on the bone body of the bone screw and placed in the cortical bone together with the bone screw, and the space for the small body can be shaken by using the sleeve to maintain the nail body. A cannulated bone screw that promotes the growth of the epiphysis and accelerates the healing of the fracture.

[0011]

The secondary purpose of the present invention is to provide a cannulated bone screw, the nail head and the nail body of the bone screw can be disassembled or combined, so that the inner diameter of the sleeve smaller than the outer diameter of the nail head and the nail body can be nailed. The head is sleeved on the body when separated from the body and is mounted between the nail head and the body thread.

[0012]

Another object of the present invention is to provide a cannulated bone screw, the sleeve of which is composed of a plurality of sleeves, so that a sleeve having an inner diameter smaller than the outer diameter of the nail head and the threaded body can be sleeved and mounted on the nail. Between the head and the body thread.

[0013]

In order to achieve the above-mentioned main purpose and efficacy, the present invention discloses a cannulated bone screw comprising a bone screw and a sleeve, the bone screw comprising a nail head and a nail body, the nail head being disposed on The top of the bone screw is connected to the nail head at one end, and the sleeve is sleeved on the nail body and maintains a gap with the nail body.

[0014]

When in use, the cannulated bone screw of the present invention is inserted into a bone plate comprising a bone nail hole and one of the broken bones below the bone plate, the nail head is locked in the bone nail hole, and the sleeve is buried in the bone plate. One of the tops of the broken bone drills a hole in the cortex, the nail passes through the sleeve, one of the bone marrow in the center of the broken bone, and is locked to the cortical bone at the bottom of the broken bone, the sleeve and the nail The gap between the body causes the nail to be shaken by a small amount after the installation of the cannulated bone screw of the present invention, and the stress generated by the shaking of the nail body can stimulate the fibrous tissue to proliferate and differentiate into cartilage to accelerate the healing of the fracture site. .

[0015]

In order to achieve the above-mentioned secondary purpose and effect, the center of the nail head of the sleeve-type bone screw of the present invention further includes a connecting hole, and the inner edge of the connecting hole and the top of the nail body are respectively provided with complementary threads, so that The body can be screwed or separated from the nail head.

[0016]

In use, the nail body may first pass through the nail hole of the bone plate, the hole of the top of the broken bone, and the bone marrow, and lock the cortical bone at the bottom of the broken bone, and then the sleeve is The top of the nail body is nested and embedded in the hole, and finally the nail head is screwed to the top of the nail body by the connecting hole to lock the nail head to the nail hole.

[0017]

In order to achieve the other purpose and effect mentioned above, the sleeve of the sleeve-type bone screw of the present invention further comprises a plurality of cannula valves which are respectively connected to adjacent sleeves and combined into the sleeve. The tube is configured such that the sleeves can be sleeved around the body to fit the sleeve.

[0018]

In use, the sleeves are assembled around the body as the sleeve and embedded in the hole, and the nail is passed through the bone hole of the bone plate to lock the bottom of the broken bone. The cortical bone is simultaneously locked in the nail hole.

10‧‧‧ bone screw

100‧‧‧nail head

1000‧‧‧first male thread

1002‧‧‧Fixed holes

1004‧‧‧ third female thread

102‧‧‧

1020‧‧‧Second male thread

1022‧‧‧third male thread

1024‧‧‧Extension

1026‧‧‧stops

12‧‧‧ casing

120‧‧‧ casing flap

122‧‧‧fourth male thread

124‧‧‧Shrap

14‧‧‧ gap

2‧‧‧ bone plate

20‧‧‧ bone nail hole

200‧‧‧first female thread

3‧‧‧Broken bone

30‧‧‧Bone cortex

300‧‧‧ holes

32‧‧‧Bone marrow

[0019]

The first picture: it is a schematic diagram of the state of use of the conventional bone screw;

The second figure is a schematic cross-sectional view of the state of use of the first embodiment of the creation;

Figure 3A is a schematic cross-sectional view showing the state of use of the second embodiment of the present invention;

Figure 3B is a top plan view showing the state of use of the second embodiment of the present invention;

Figure 4A is a schematic cross-sectional view showing the state of use of the third embodiment of the present creation;

Figure 4B is a perspective view showing the structure of the third embodiment of the creation;

Figure 5 is a perspective view showing the structure of the fourth embodiment of the present invention;

Figure 6 is a schematic cross-sectional view showing the state of use of the fifth embodiment of the present invention;

Figure 7 is a schematic cross-sectional view showing the state of use of the sixth embodiment of the present invention;

Figure 8 is a schematic cross-sectional view showing the state of use of the seventh embodiment of the present invention; and

Figure 8B is a perspective view showing the structure of the seventh embodiment of the present invention.

[0020]

In order to give your reviewers a better understanding and understanding of the characteristics of the creation and the efficacies achieved, please provide a better example and a detailed description of the following:

[0021]

The sleeve-type bone screw of the present invention is characterized in that the sleeve is sleeved on the nail body of the bone screw and embedded in the cortical bone together with the bone screw, and the space of the nail body can be used for small shaking by the sleeve. And achieve the purpose of promoting bone growth and accelerating fracture healing. In addition, in order to make the sleeve can be set on the nail body of the bone screw, the creation can further add a detachable design between the nail head and the nail body, and the nail head, the sleeve and the nail head are sequentially assembled after the nail head is assembled. The body can be sleeved on the body of the nail body, and the detachable design can be further added to the sleeve, so that the sleeve is assembled from the plurality of sleeves and sleeved on the nail body. .

[0022]

Referring first to the second drawing, which is a schematic cross-sectional view of the first embodiment of the present invention; as shown in the second figure, the cannulated bone screw of the present invention comprises a bone screw 10 and a cannula 12, the bone screw 10 includes a nail head 100 and a nail body 102. The nail head 100 is disposed on the top of the bone screw 10. One end of the nail body 102 is connected to the nail head 100, and the sleeve 12 is sleeved on the nail body 102. A gap 14 is maintained between the body 102 and the body 102.

[0023]

A bone plate 2 has at least one bone hole 20, the bone plate 2 is disposed on a broken bone 3, the outer side of the broken bone 3 is a cortical bone 30 and the inner side is a bone marrow 32, at the top of the broken bone 3 The bone cortex 30 is drilled with a hole 300 through which the body 102 of the bone screw 10 penetrates, the bone marrow 32, and the cortical bone 30 at the bottom of the broken bone 3, the sleeve 12 As the body 100 is embedded in the hole 300 of the cortical bone 30, the nail head 100 of the bone screw 10 is locked to the nail hole 20 of the bone plate 2.

[0024]

Through the arrangement of the above components, the cannulated bone screw of the present invention can be buried in the hole 300 of the cortical bone 30 by the sleeve 12 so that the hole 300 does not heal too quickly and penetrates the sleeve 12 The gap 14 is maintained between the bone body 102 and the bone screw 10 is mounted on the bone plate 2 and the broken bone 3, and the nail body 102 can still be shaken by a small amount to stimulate the broken bone 3 and accelerate the fracture. The fibrous tissue growth and differentiation of the site is used to facilitate the formation of the epiphysis and accelerate the subsequent healing of the fracture.

[0025]

In addition, the outer edge of the nail head 100 is further provided with a first male thread 1000, and the inner edge of the nail hole 20 is further provided with a first female thread 200, and the first male thread 1000 and the first female thread 200 are complementary structures. Therefore, the nail head 100 can be locked to the nail hole 20 through the screwing of the first male thread 1000 and the first female thread 200.

[0026]

In addition, the second body male thread 1020 is further disposed on a surface of the nail body 102 away from the end surface of the nail head 100. Therefore, in the embodiment, the nail body 102 can be locked to the bottom of the broken bone 3 through the second male thread 1020. The cortical bone 30.

[0027]

By providing a thread on the nail head 100, the nail body 102 (and the nail hole 200), the bone screw 10 can be combined with the bone plate 2 and the broken bone 3 by screwing to achieve The bone plate 2 is locked to the surface of the broken bone 3.

[0028]

Please refer to FIG. 3A and FIG. 3B, which are schematic cross-sectional views of the use state of the second embodiment of the present invention and a top view of the use state; as shown in FIG. 3A, the main difference between the embodiment and the first embodiment In the embodiment, the center of the nail head 100 further includes a connecting hole 1002. The inner edge of the connecting hole 1002 is further provided with a third female thread 1004. The nail body 102 and the nail head 100 are connected to the outer edge of the nail head 100. The third male thread 1022, the third male thread 1022 and the third female thread 1004 are complementary structures, so the nail body 102 can be connected to the third male thread 1022 and the third female thread 1004 by screwing The connecting hole 1002 of the nail head 100.

[0029]

Through the arrangement of the above components, the nail head 10 included in the bone screw 10 of the present invention is conveniently combined and disassembled with the nail body 100, and the inner diameter of the sleeve 12 can be smaller than the nail. When the outer diameter of the head 100 (the first male thread 1000) and the outer diameter of the second male thread 1020 of the nail body 102, the sleeve 12 is sleeved on the nail body 102, as compared with the production The sleeve 12 is formed on the outside of the body 102, and the nail head 100 of the bone screw 10 and the body 102 are designed to be detachable and cost-effective.

[0030]

When the cannulated bone screw of the embodiment is used, the body 102 is first passed through the hole 300 drilled in the cortical bone 30 at the top of the broken bone 3, through the bone marrow 32 and through the second male thread 1020. Locking the cortical bone 30 at the bottom of the broken bone 3, and then inserting the sleeve 12 from the top end of the nail body 102 into the nail body 102 and embedding the cortical bone 30 at the top of the broken bone 3, and finally the nail The head 100 is screwed into the nail hole 20 by the top end of the nail body 102, and the first male thread 1000 of the outer edge of the nail head 100 is screwed with the first female thread 200 of the inner edge of the nail hole 20, and The third female thread 1004 of the inner edge of the fixing hole 1002 at the center of the nail head 100 is screwed with the third male thread 1022 of the upper end of the nail body 102.

[0031]

The first male thread 1000 disposed on the outer edge of the nail head 100 and the third female thread 1004 disposed on the inner edge of the nail head 100 can simultaneously be respectively associated with the first female thread 200 and the third male thread 1022. The screwing direction of the first male thread 1000 and the first female thread 200 should be opposite to the screwing direction of the third male thread 1022 and the third female thread 1004, that is, viewed from a fixed viewing angle. When the first male thread 1000 is rotated in the clockwise direction to be screwed with the first female thread 200, the third male thread 1022 should be rotated in the counterclockwise direction to be screwed with the third female thread 1004.

[0032]

As shown in FIG. B, when the nail head 100 rotates clockwise relative to the nail hole 200, the nail body 102 corresponds to counterclockwise rotation with respect to the nail head 100, so that the outer edge of the nail head 100 is the first The third female thread 1004 of the male thread 1000 and the inner edge of the nail head 100 can simultaneously simultaneously with the first female thread 200 of the inner edge of the nail hole of the bone plate 2 and the third edge of the outer edge of the nail body 102 The male thread 1022 is screwed.

[0033]

Referring to FIG. 3A, in order to enable the nail head 100 to be screwed into the third male thread 1022 of the nail body 102 while being screwed into the nail hole 20, the nail body 102 may further include an extension portion. 1024 (the dotted line above the nail head 100), when the nail head 100 is screwed into the nail hole 20, the extending portion 1024 can be fixed by a tool, so that the nail head 100 and the nail body 102 can be rotated relative to each other. The third female thread 1004 and the third male thread 1022 are screwed. In addition, after the nail head 100 is screwed into the nail hole 20, the extension portion 1024 can be cut off.

[0034]

Please refer to FIG. 4A and FIG. 4B, which are schematic sectional views and structural schematic views of the third embodiment of the present invention; as shown in FIG. 4A, the main difference between the present embodiment and the first embodiment is that In the present embodiment, the sleeve 12 is of a detachable design, and the sleeve 12 further includes a plurality of sleeves 120, which can be respectively connected to the adjacent sleeves 120 and combined into the sleeve. Tube 12.

[0035]

Through the arrangement of the above components, the sleeve 12 of the present cannulated bone screw is conveniently combined on the periphery of the body 102 of the bone screw 10, and the inner diameter of the sleeve 12 can be smaller than the nail head 100. When the outer diameter of the first male thread 1000 and the outer diameter of the second male thread 1020 of the nail body 102 are set, the sleeve 12 is sleeved on the nail body 102, which is the same as that at the time of manufacture. The tube 12 is formed on the outside of the nail body 102 or in the second embodiment, the nail head 100 of the bone screw 10 and the nail body 102 are designed in a detachable manner, and the sleeves 120 are combined into the sleeve. The way of tube 12 is more cost effective.

[0036]

In addition, when the cannulated bone screw of the embodiment is used, the sleeves 120 can be outside the nail body 102 before the bone screw 10 is inserted into the bone nail hole 20 (above the second male thread 1020) Combining the cannula 12 into the cannula 12, or after the bone screw 10 penetrates the bone nail hole 20, drilled into the hole 300 of the cortical bone 30 or the bone marrow 32, the sleeves 120 are combined into The sleeve 12 is then embedded in the hole 300 of the cortical bone 30, and finally the second male thread 1020 is locked to the cortical bone 30 at the bottom of the broken bone 3, so that the nail head is The first male thread 1000 of 100 is screwed to the first female thread 200 of the nail hole 20 to complete the installation.

[0037]

Please refer to the fifth figure, which is a perspective view of the structure of the fourth embodiment of the present invention; as shown in the fifth figure, the main difference between the embodiment and the first embodiment is that in the embodiment, the bone screw 10 is The outer diameter of the nail head 100 is decreased from the top to the bottom thereof, and the inner diameter of the bone nail hole 20 of the bone plate 2 should be decreased from the top to the bottom thereof (the bone plate 2 is not shown in the fifth figure, please refer to 2A)), the structure can make the nail head 100 lock into the bone nail hole 20 when the bone screw 10 is locked to the bone plate 2, and the nail head 100 is less likely to be reversed after being locked. The nail hole 20 is detached.

[0038]

Similarly, since the inner diameter of the sleeve 12 is smaller than the outer diameter of the first male thread 1000 of the nail head 100, the nail head 100 cannot be inserted into the nail body 102, and the inner diameter of the sleeve 12 is smaller than The outer diameter of the second male thread 1020 of the nail body 102 and the outer diameter of the stopper 1026 cannot be inserted into the nail body 102 from the tip end of the nail body 102. This embodiment can also adopt a second implementation. In the example, the nail head 100 and the nail body 102 are detachable or the sleeve 12 is combined with the plurality of sleeves 120 in the third embodiment, so that the sleeve 12 can be sleeved on the nail body. 102, and located below the nail head 100, above the second male thread 1020.

[0039]

Please refer to the sixth figure, which is a schematic structural view of the fifth embodiment of the present invention; as shown in the sixth figure, the main difference between the embodiment and the first embodiment is that: in the embodiment, the nail of the bone screw 10 The body 102 is further provided with a stop member 1026 to stop the sleeve 12 from being prevented from sliding from the cortical bone 30 to the bone marrow 32, thereby preventing the hole 300 of the cortical bone 30 from healing to maintain The effect of the space of the nail body 102 shaking slightly. The structure of the stopper 1026 may be formed by at least one bump as shown in the sixth figure, or may be an annular structure, and the outer diameter of the stopper 1026 should be at least larger than the inner diameter of the sleeve 12 to The stop is achieved by the cannula 12 being slid into the bone marrow 32 by the cortical bone 30.

[0040]

This embodiment can also be combined with the design that the nail head 100 and the nail body 102 are detachable in the second embodiment or the sleeve 12 is combined by the plurality of sleeves 120 in the third embodiment. The inner diameter of the sleeve 12 can be smaller than the outer diameter of the nail head 100 (the first male thread 1000) and the second male thread 1020 of the nail body 102 and the outer diameter of the stopper 1026. The sleeve is disposed over the stop 1026 of the body 102.

[0041]

Please refer to the seventh figure, which is a schematic structural view of the sixth embodiment of the present invention; as shown in the seventh figure, the main difference between the present embodiment and the first embodiment is that: in the present embodiment, the outer edge of the sleeve 12 Further, a fourth male thread 122 is disposed, and the fourth male thread 122 can be locked in the hole 300 of the cortical bone 30 at the top of the broken bone 3, and the sleeve 12 can be prevented from sliding down to the cortical 30. The bone marrow 32 does not function to prevent the hole 300 of the cortical bone 30 from healing to maintain a small amount of shaking of the body 102.

[0042]

This embodiment can also be combined with the design that the nail head 100 and the nail body 102 are detachable in the second embodiment or the sleeve 12 is combined by the plurality of sleeves 120 in the third embodiment. In the embodiment, the outer edge of the sleeve 12 is further provided with the fourth male thread 122. When the plurality of sleeves 120 are respectively formed, the structure is relatively complicated, so that the nail head 100 and the nail body 102 are made detachable. The manner of the combination with the embodiment is better.

[0043]

Please refer to FIG. 8A and FIG. 8B, which are schematic sectional views and structural schematic views of the seventh embodiment of the present invention; as shown in FIG. 8A and FIG. 8B, the present embodiment and the first embodiment are shown. The main difference is that in the embodiment, the outer side of the sleeve 12 is further provided with at least one elastic piece 124. The elastic piece 124 is pressed by the inner edge of the hole 300 of the cortical bone 30, and is elastically clamped to the hole 300. The sleeve 12 is prevented from slipping to the bone marrow 32, so that the sleeve 12 can be continuously disposed in the hole 300 of the cortical bone 30 to maintain a space for the nail body 102 to shake slightly.

[0044]

In addition, in the present embodiment, the outer diameter of the body 102 of the bone screw 10 is decreased from the upper portion of the fourth male thread 122 toward the top of the nail body 102. Compared with the foregoing embodiment, the structure causes the nail body 102 to be formed. The gap 14 between the sleeve 12 and the sleeve 12 is relatively large, so that the body 102 can be shaken to a large extent.

[0045]

This embodiment can also be combined with the design that the nail head 100 and the nail body 102 are detachable in the second embodiment or the sleeve 12 is combined by the plurality of sleeves 120 in the third embodiment. The sleeve 12 is disposed on the outer side of the body 102.

[0046]

In summary, the present invention provides a cannulated bone screw comprising a bone screw and a sleeve, the bone screw comprising a nail head and a nail body, the nail head being disposed on the top of the bone screw, One end of the nail body is connected to the nail head, and the sleeve is sleeved on the nail body and maintains a gap with the nail body. After the sleeve is placed on the cortical bone, the bone screw is locked into the bone plate and the cortical bone. The rock can still be shaken a small amount in the gap between the sleeve and the nail body, and the bone screw can be used to appropriately stimulate the tissue of the fracture site to promote the growth of the callus and accelerate the fracture healing.

[0047]

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.

[0048]

This creative department is a novelty, progressive and available for industrial use. It should meet the requirements of patent applications stipulated in China's Patent Law. It is undoubtedly a new type of patent application, and the Prayer Council will grant patents as soon as possible. prayer.

10‧‧‧ bone screw

100‧‧‧nail head

1000‧‧‧first male thread

102‧‧‧

1020‧‧‧Second male thread

12‧‧‧ casing

14‧‧‧ gap

2‧‧‧ bone plate

20‧‧‧ bone nail hole

200‧‧‧first female thread

3‧‧‧Broken bone

30‧‧‧Bone cortex

300‧‧‧ holes

32‧‧‧Bone marrow

Claims (10)

[Item 1] A cannulated bone screw comprising:
a bone screw comprising:
a nail head disposed on the top of the bone screw; and a nail body having one end connected to the nail head; and a sleeve sleeved on the nail body, and the sleeve and the nail body Keep a gap. [Item 2] The cannulated bone screw according to claim 1, wherein the bone screw is locked to one of the bone plate holes of the bone plate, and the inner edge of the bone nail hole is further provided with a first female thread, the nail head The outer edge is further provided with a first male thread, and the nail head is screwed to the first female thread of the nail hole through the first male thread. [Item 3] The cannulated bone screw of claim 1, wherein the outer diameter of the nail head decreases toward the bottom. [Item 4] The cannulated bone screw of claim 1, wherein the body surface is further provided with a second male thread. [Item 5] The cannulated bone screw of claim 1, wherein the center of the nail head further comprises a connecting hole, the inner edge of the connecting hole further comprises a third female thread, and the body is further provided with a third male thread. And the nail body is screwed to the third female thread of the nail head through the third male thread. [Item 6] The cannulated bone screw of claim 1, wherein the body is further provided with a stop member that stops the sleeve. [Item 7] The cannulated bone screw of claim 1, wherein the outer edge of the sleeve further comprises a fourth male thread. [Item 8] The cannulated bone screw of claim 1, wherein the cannula comprises a plurality of cannula valves connected to adjacent cannula valves and combined into the cannula. [Item 9] The cannulated bone screw of claim 1, wherein the outer side of the sleeve is further provided with at least one elastic piece. [Item 10] The cannulated bone screw of claim 1, wherein the outer diameter of the body is decreasing toward the top.