CN212788789U

CN212788789U - Spherical netted bone end joint surface support

Info

Publication number: CN212788789U
Application number: CN202020748208.2U
Authority: CN
Inventors: 屠重棋; 卢敏勋
Original assignee: West China Hospital of Sichuan University
Current assignee: West China Hospital of Sichuan University
Priority date: 2020-05-08
Filing date: 2020-05-08
Publication date: 2021-03-26
Anticipated expiration: 2030-05-08

Abstract

The utility model discloses a spherical netted bone end articular surface supporter, including head and afterbody, the head is netted sphere, afterbody cavity, afterbody both ends opening, the one end connecting head of afterbody. The utility model discloses when providing axial support, can also provide even circumference expansibility and support.

Description

Spherical netted bone end joint surface support

Technical Field

The utility model relates to the field of medical equipment, especially, relate to a spherical netted bone end articular surface supporter.

Background

Avascular necrosis of the femoral head is a common disease and frequently encountered diseases in orthopedics, the avascular necrosis of the femoral head can cause death of active ingredients of the femoral head due to the blood supply destruction of the femoral head caused by various reasons, and in the process of repairing a osteonecrosis area of an organism, the bone trabecula which is necrotic in the early stage is mainly absorbed, so that a collapse area is more fragile.

One of the existing treatment methods is to support the device by a support device. Existing femoral head support devices are rod-shaped or umbrella-shaped and generally provide axial or partial support.

The patent application (application number: 201710971095.5) discloses a hollow titanium rod with a fixing device for supporting a femoral head to prevent collapse, which comprises a rod body and the fixing device, wherein the rod body is integrally formed, the rod body is an octagonal prism, a hydroxyapatite coating is arranged on the outer surface of the rod body, a through hole is formed in the rod body along the axial direction of the rod body, a thick thread is arranged at the tail end of the rod body, an inner hexagonal notch is formed in the tail end of the rod body, the inner hexagonal notch is communicated with the through hole, and the fixing device is connected with the tail end of the rod body. The utility model discloses a femoral head supports the department of subsides that the titanium stick implanted the femoral head and plays mechanical supporting role, and improves femoral head, neck ground biomechanics characteristic, prevents that the femoral head from subsideing, and the femoral head supports the titanium stick and designs into hollow structure, can exert femoral head decompression effect for a long time, and the hydroxyapatite coating of titanium stick external surface is good with human histocompatibility, and titanium stick tail end is provided with fixing device, has prevented the not hard up slippage of titanium stick effectively.

Another patent application (application number: 201110161085.8) discloses a nickel-titanium memory alloy umbrella-titanium cage femoral head internal support which is composed of a nickel-titanium memory alloy umbrella, a TA2 pure titanium support body and a TA2 pure titanium tail fastening screw, can contain bone materials or production factors, and can automatically increase the support area after being implanted.

Another example is the patent application (application No. 201020641438.5) which discloses an umbrella-shaped memory alloy femoral head supporter, which is composed of 8 supporting ribs.

Reference may also be made to the following patents (publication numbers: CN 102824208A; CN 201912208U).

The design of the femoral head support body in the above patent applications is not enough, and due to the unreasonable design and size, the support function is limited to a small part, and the axial direction is taken as the main support direction, so that the whole expansion support cannot be provided. Although some patents adopt memory alloy to achieve the purpose of minimally invasive treatment, the nickel-titanium alloy cannot provide long-term effective support due to the strength and the shape and size of the nickel-titanium alloy. This was also confirmed by its relevant clinical studies.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a spherical netted bone end articular surface supporter, when providing axial support, can also provide even circumference expansibility and support.

In order to achieve the purpose, the utility model adopts the following technical proposal to realize:

the utility model discloses a spherical netted bone end articular surface supporter, including head and afterbody, the head is netted sphere, afterbody cavity, afterbody both ends opening, the one end connecting head of afterbody.

Furthermore, the other end of the tail part is provided with an internal thread.

Preferably, the reticular spherical surface is formed by intersecting metal wires.

Further, the wire comprises at least two diameters of wire.

Preferably, the metal wire is a memory alloy.

Further preferably, the memory alloy is a nickel titanium alloy.

Preferably, the tail part is in a circular truncated cone shape.

As another preference, the tail is cylindrical.

Preferably, the diameter of the reticular spherical surface in a compression state is not larger than the outer diameter of the tail part.

Preferably, the metal wires are two types, namely a fine metal wire and a coarse metal wire, the diameter of the fine metal wire is 200-.

The utility model has the advantages as follows:

1. the utility model discloses a head is the sphere, when providing the axial support, can also provide even circumference expansibility and support.

2. The head of the utility model is in a net shape, and the bone conduction and the bone induction are good.

3. The memory alloy of the utility model adopts nickel-titanium alloy, and has good biocompatibility.

4. The utility model discloses combine two kinds of wires of thickness, not only guarantee sufficient support intensity, improved the osteoconductivity of supporter moreover.

5. The internal thread of the tail part can be designed to match the diameter of the conventional implantation screw such as PFNA

6. The diameter of the head part is less than or equal to that of the tail part in a compression state, so that minimally invasive implantation is facilitated.

Drawings

Fig. 1 is a schematic structural diagram of the present invention in a recovery state;

FIG. 2 is a partial enlarged view of the head surface;

FIG. 3 is a schematic structural view of the present invention in a compressed state;

in the figure: 1-head, 2-tail, 11-thick metal wire, 12-thin metal wire and 21-internal thread.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings.

As shown in fig. 1, the spherical reticulated bone end joint surface support disclosed by the present invention comprises a head portion 1 and a tail portion 2, wherein the head portion 1 is a reticulated spherical surface, the tail portion 2 is hollow, two ends of the tail portion 2 are open, one end of the tail portion 2 is connected with the head portion 1, and the other end of the tail portion 2 is provided with an internal thread 21; the reticular spherical surface is formed by intersecting metal wires and comprises at least two metal wires with different diameters, the metal wires are made of memory alloy, and the memory alloy is preferably nickel-titanium alloy; the tail part 2 is in a circular truncated cone shape or a cylindrical shape.

As shown in FIG. 2, the present embodiment employs two kinds of metal wires, namely, a fine metal wire 12 and a coarse metal wire 11, wherein the diameter of the fine metal wire 11 is 200-300 μm, the diameter of the coarse metal wire 11 is 1000-1200 μm, and the number ratio of the fine metal wire 12 to the coarse metal wire 11 is 8:2 to 3: 7.

As shown in fig. 3, the diameter of the spherical netlike surface in the compressed state is smaller than the outer diameter of the tail portion 2.

Of course, the present invention may have other embodiments, and those skilled in the art may make various corresponding changes and modifications according to the present invention without departing from the spirit and the essence of the present invention, and these corresponding changes and modifications should fall within the protection scope of the appended claims.

Claims

1. Spherical netted bone end articular surface supporter, its characterized in that: the tail part is hollow, two ends of the tail part are open, and one end of the tail part is connected with the head part; the reticular spherical surface is formed by intersecting metal wires.

2. The spherical reticulated bone end facet support of claim 1, wherein: the other end of the tail part is provided with an internal thread.

3. The spherical reticulated bone end facet support of claim 1, wherein: the wire comprises wires of at least two diameters.

4. The spherical reticulated bone-end articular surface support of claim 2 or 3, wherein: the metal wire is made of memory alloy.

5. The spherical reticulated bone end facet support of claim 4, wherein: the memory alloy is nickel titanium alloy.

6. The spherical reticulated bone-end articular surface support of claim 1 or 2, wherein: the tail part is in a circular truncated cone shape.

7. The spherical reticulated bone-end articular surface support of claim 1 or 2, wherein: the tail is cylindrical.

8. The spherical reticulated bone-end articular surface support of claim 1 or 2, wherein: the diameter of the reticular spherical surface in a compression state is not larger than the outer diameter of the tail part.

9. The spherical reticulated bone end facet support of claim 3, wherein: the metal wires are divided into two types, namely a fine metal wire and a coarse metal wire, the diameter of the fine metal wire is 200-300 mu m, the diameter of the coarse metal wire is 1000-1200 mu m, and the number ratio of the fine metal wire to the coarse metal wire is 8: 2-3: 7.