CN219070598U - Degradable bone nail - Google Patents

Abstract

The utility model relates to a degradable bone nail, which comprises a nail body, wherein a nail cap is arranged at the top of the nail body: the nail body and the nail cap are integrated into a whole structure. The whole bone nail is made of degradable materials, and the strength of the bone nail is improved by arranging the frame inside the bone nail.

Description

Degradable bone nail

Technical Field

The utility model relates to the technical field of medical equipment, in particular to a degradable bone nail.

Background

Bone nails are orthopedic implants commonly used for fixation in clinic, and are commonly used for fixation or distraction in orthopedics. For example, bone nails are commonly used for fixation of internal fractures or dislocation, where fixation of the fracture is achieved by direct citrate insertion into two different bone pieces or into an internal implant such as a fixed bone plate, positioning the bone and promoting its healing. The bone nail has wide application range, and the action parts comprise large areas such as shoulder, elbow, epiphysis, knee, spine and the like.

The absorbable bone nail in the bone nail is convenient to use, and secondary operation is not needed. However, the absorbable bone nails in the prior art have the problem of insufficient strength.

Disclosure of Invention

The utility model aims to provide the degradable bone nail, which is made of degradable materials, and the strength of the bone nail is improved by arranging the frame inside the bone nail.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the utility model provides a degradable bone nail, includes the nail body, the nail body top is equipped with the nail cap, the nail is internal to be equipped with and is used for increasing the frame of nail body intensity, the nail body with the nail cap is integrated into one piece structure, the nail body the nail cap with the frame is degradable material and makes.

Preferably, the main body of the nail body is a cylinder, and the bottom of the nail body is a cone.

Preferably, threads are arranged on the main body of the nail body.

Preferably, the threads are located on a lower portion of the shank body.

Preferably, the nut is provided with a clamping groove for being matched with a spanner.

Preferably, the clamping groove is an H-shaped groove.

Preferably, the frame is a mesh ring structure and comprises a plurality of vertical uprights and a plurality of transverse circular rings, wherein the uprights are uniformly distributed on the inner sides of the circular rings to form the mesh ring structure.

Preferably, the plurality of transverse rings are equally spaced.

Preferably, the frame is made of magnesium alloy which can be degraded in human body.

Preferably, the nail body and the nail cap are made of hydroxyapatite which can be degraded in human body.

Due to the adoption of the technical scheme, the utility model has the following advantages:

1. according to the degradable bone nail provided by the utility model, the strength of the bone nail is improved by arranging the frame in the nail body.

2. The degradable bone nail provided by the utility model has a better limiting effect by matching the H-shaped groove on the nail cap with the spanner of the H-shaped port, and improves the anti-disengaging performance in the screwing process.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Like parts are designated with like reference numerals throughout the drawings. In the drawings:

fig. 1 is a schematic perspective view of a degradable bone screw according to an embodiment of the present utility model.

Fig. 2 is a front view of the degradable bone screw of the present embodiment.

Fig. 3 is a top view of the degradable bone screw of this embodiment provided by the present utility model.

Fig. 4 is a front view of the frame of this embodiment provided by the present utility model.

Fig. 5 is a top view of the frame of this embodiment provided by the present utility model.

The various references in the drawings are as follows:

1 is a nail body, 2 is a nail cap, 3 is a frame, 301 is a vertical rod, 302 is a circular ring, 4 is a thread, 5 is a clamping groove, 501 is a vertical groove, 502 is a transverse groove, and 6 is a transition surface.

Detailed Description

Exemplary embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.

The degradable bone nail provided by the utility model is integrally made of degradable materials, and the strength of the bone nail is improved by arranging the frame inside the bone nail.

Hereinafter, embodiments of the present utility model will be described in detail with reference to the accompanying drawings.

Examples

The degradable bone nail provided by the embodiment, as shown in fig. 1 and 2, comprises a nail body 1, wherein the main body of the nail body 1 is a cylinder, the bottom of the nail body 1 is a cone, and the bottom of the cone is provided with a cone tip, so that the bone nail can be more beneficial to being drilled into bones; the nail body 1 top is equipped with nail cap 2, and nail cap 2 is rectangle structure, is equipped with transition face 6 between the bottom surface of nail cap 2 and the top surface of nail body 1, has increased the intensity of the connection between nail body 1 and the nail cap 2, and nail body 1, nail cap 2 and frame 3 are degradable material and make.

When a spanner acts on the nail cap 2, the bone nail is screwed, and the transition surface 6 between the bottom surface of the nail cap 2 and the top surface of the nail body 1 reduces the risk of fracture between the nail cap 2 and the nail body 1 in the screwing process.

The frame 3 is embedded in the nail body 1, and the strength of the nail body 1 is increased through the frame 3, so that the firmness of bone fixation is improved.

The nail body 1 and the nail cap 2 are of an integrated structure, so that the rigidity of the bone nail is improved. The nail body 1 and the nail cap 2 are both degradable materials, are applied to fracture fixation, can be automatically absorbed by a human body, and become a part of the skeleton of the human body. Specifically, the degradable material is hydroxyapatite, commonly known as artificial bone.

In this embodiment, the body of the shank 1 is provided with threads 4, in particular the threads 4 being located in the lower part of the shank body. By means of the screw thread 4, the bone screw can be more easily drilled into the bone.

In this embodiment, as shown in fig. 3, a clamping groove 5 for being matched with a wrench is arranged on the nut 2, the clamping groove 5 is an H-shaped groove, the H-shaped groove comprises two vertical grooves 501 and a horizontal groove 502, the two vertical grooves 501 are positioned at two ends of the horizontal groove 502, the H-shaped groove has a better limiting function, and is matched with the wrench of the H-shaped port, so that the wrench is not easy to slip from the nut 2.

Further, the depth of the vertical grooves 501 at the two ends of the H-shaped groove is larger than that of the horizontal groove 502 in the middle of the H-shaped groove, and when the end of the wrench is clamped into the H-shaped groove, the anti-falling performance of the wrench is further improved.

Further, the width of the vertical grooves 501 at two ends of the H-shaped groove is smaller than that of the horizontal groove 502 in the middle of the H-shaped groove, so that the anti-falling performance of the wrench is further improved.

In this embodiment, as shown in fig. 4 and 5, the frame 3 is a mesh ring structure, and includes a plurality of longitudinal uprights 301 and a plurality of transverse rings 302, where the uprights 301 are uniformly distributed on the inner side of the rings 302 and are in contact connection with the inner wall of the rings 302 to form a mesh ring structure. In a specific application, the upright rod 301 is fixedly connected to the inner wall of the circular ring 302 in a welding manner.

Further, the outer diameter of the circular ring 302 is slightly smaller than the outer diameter of the main body of the nail body 1, so that the strength of the nail body 1 can be better provided.

Further, the plurality of transverse circular rings 302 are equally spaced and uniformly arranged in the nail body 1. In this embodiment, four rings 302 are arranged in the shank 1.

In this embodiment, the upright rod 301 is a round rod, and the diameter of the round rod is twenty-fourth of the outer diameter of the main body of the nail body 1, so that the effect of reinforcing and fixing is achieved, and the problem that the final degradation and decomposition are difficult due to the overlarge diameter is avoided, so that a certain burden is caused to the body.

In this embodiment, the upright rod 301 and the circular ring 302 are made of degradable materials, and after the nail body 1 and the nail cap 2 of the bone nail are decomposed and absorbed by human body, the upright rod 301 and the circular ring 302 are degraded and separated in the human body.

In specific application, the upright rod 301 and the circular ring 302 are made of metal, specifically, degradable magnesium alloy which can be absorbed and degraded by human body, and can be removed by urine, so that the novel magnesium alloy has no toxic or side effect on the human body.

The cross section of the circular ring 302 is rectangular, the thickness of the circular ring 302 is twenty-fourth of the outer diameter of the main body of the nail body 1, and the difference between the inner diameter and the outer diameter is twelve of the outer diameter of the main body. For example: the main body outer diameter of the nail body 1 is 12mm, the diameter of the vertical rod 301 is 0.5mm, the thickness of the circular ring 302 is 0.5mm, the outer diameter of the circular ring 302 is 11.5mm, and the inner diameter is 10.5mm. The frame 3 not only increases the strength of the bone screw, but also controls the content of magnesium alloy.

Degradable bone nail made of hydroxyapatite only and having strong strengthThe degree is weaker, and the fixation effect is often not achieved. In the degradable bone nail in the embodiment, the nail body 1 and the nail cap 2 are made of the degradable material of hydroxyapatite, the hydroxyapatite can promote bone recovery while degrading, and the frame 3 is arranged inside the bone nail, so that the strength of the bone nail is improved. The frame 3 is of a net ring structure, is made of magnesium alloy, in particular Mg-Zn-Ca-Y alloy, and has the density of 1.74g/cm compared with the traditional metal ³ Has a bone density of 1.75g/cm ³ Substantially the same, the strength and fatigue resistance are also much higher than with hydroxyapatite, while the modulus of elasticity is closer to that of natural bone tissue than with other metals. The traditional metals are not easy to absorb and difficult to degrade in vivo, and the traditional metals are taken out or left in vivo through secondary operation, so that the recovery of patients is not facilitated; the common biomedical metal material can release harmful ions by ionization and electrolysis in human body environment, or the metal material and bone tissue friction to generate fragments can have toxic and side effects such as sensitization, cancerogenesis and the like, and even the implanted metal material is invalid due to the corrosive action of body fluid. Therefore, the frame 3 is made of magnesium alloy, which has high strength and is finally metabolized out of the body in an ionic manner. If the whole bone nail is made of magnesium alloy, although magnesium ions can be degraded in human body, no toxic or side effect can be produced, if the content of the magnesium alloy is too large, a certain burden can be caused to the human body. Therefore, the frame 3 of the internal mesh structure of the bone screw in the example can achieve the effect of increasing the fixing strength, and the content of the magnesium alloy is controlled.

When the degradable bone nail in the implementation is used, the end head of the wrench is inserted into the clamping groove 5 on the nail cap 2, the bone nail is aligned to a part to be fixed, the wrench is rotated, and the bone nail is screwed into a bone to complete fixation. The nail body 1 and the nail cap 2 of the bone nail in the human body are gradually decomposed in the human body and absorbed by bones; after the nail body 1 and the nail cap 2 are absorbed, the frame 3 is degraded and absorbed in the human body. The degradable bone nail of the example improves the strength of the bone nail by arranging the frame 3 in the nail body 1. The H-shaped groove of the nail cap 2 is matched with a spanner of an H-shaped port, has a better limiting function, and improves the anti-disengaging performance in the screwing process.

The degradable bone nail in the implementation comprises a nail body 1 and a nail cap 2 which are both composed of Hydroxyapatite (HA), wherein the hydroxyapatite is a main inorganic component of bones and teeth of human bodies and animals, and the Mohs hardness is 5. The frame 3 is made of magnesium alloy material, and the hydroxyapatite material has high dissolution speed in the body and insufficient strength, so that the magnesium alloy frame 3 is added into the nail body, the strength of the bone nail is improved, the bone nail is not degraded too fast, and the recovery of a patient is facilitated.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims (10)

1. The degradable bone nail is characterized by comprising a nail body, wherein a nail cap is arranged at the top of the nail body, a frame for increasing the strength of the nail body is embedded in the nail body, the nail body and the nail cap are of an integrated structure, and the nail body, the nail cap and the frame are made of degradable materials.

2. The degradable bone screw of claim 1, wherein the body of the screw body is a cylinder and the bottom of the screw body is a cone.

3. The degradable bone screw of claim 2, wherein the body of the screw is threaded.

4. The degradable bone screw of claim 3, wherein the threads are located on a lower portion of the body of the screw.

5. The degradable bone screw of claim 1, wherein the nut is provided with a slot for mating with a wrench.

6. The degradable bone screw of claim 5, wherein the clamping groove is an H-shaped groove.

7. The degradable bone screw according to claim 1, wherein the frame is a mesh ring structure comprising a plurality of longitudinal uprights and a plurality of transverse rings, the uprights being uniformly distributed on the inner side of the rings to form the mesh ring structure.

8. The degradable bone screw of claim 7, wherein the plurality of transverse rings are equally spaced.

9. The degradable bone screw of claim 1, wherein the frame is made of magnesium alloy that is degradable in the human body.

10. The degradable bone screw of claim 7, wherein the screw body and the screw cap are made of hydroxyapatite that is degradable in the human body.

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