CN210019803U - Cage type support - Google Patents

Abstract

The utility model provides a cage type support, include: head and somatic part, the surface of head is the arc surface, the somatic part is cylindricly, head and somatic part body coupling, the head all has the hole on the surface with the somatic part, just the porosity of somatic part is greater than the porosity of head, be connected with the screw thread on the surface of somatic part, can improve the controllability in implantation position in the screw in tunnel of sclerotin, can prevent again simultaneously and withdraw from by oneself. The head part and the body part of the utility model are connected integrally to form a bullet head shape matched with the shape of the femoral head, the head part with the arc surface can improve the contact area of the subchondral bone of the femoral head to the maximum extent, the porosity of the head part is small, the elastic modulus is high, the strong mechanical supporting function can be played, and the collapse of the femoral head is prevented; the body has higher porosity, which is more favorable for the ingrowth of the surrounding bone tissue and ensures that the bracket is well integrated with the surrounding bone tissue.

Description

Cage type support

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a cage type support.

Background

Early femoral head necrosis, if not treated in time, further progression can lead to collapse of the femoral head, eventually necessitating a total hip replacement. However, since femoral head necrosis occurs more frequently in young and middle-aged patients, it is not appropriate to perform total hip replacement prematurely. Therefore, how to delay the process of femoral head necrosis and prevent femoral head collapse is very important.

Currently, various surgeries based on "core decompression" are clinically effective strategies for treating early stage femoral necrosis. The collapse of the femoral head is finally caused by the fact that the simple core decompression can cause the local stress concentration of the femoral head and the lack of good mechanical support of subchondral bone. Therefore, core decompression in combination with implant support for treatment is currently the primary treatment strategy.

Commonly used implants mainly comprise: autogenous bone, allogeneic bone, artificial bone, metal support bar and the like. The simple implantation of autogenous bone, allogeneic bone or artificial bone has poor supporting effect, and can be gradually absorbed along with the lapse of time, and the long-term effect is not ideal; the metal support rod can provide mechanical support for subchondral bone, but the bone is not well grown, so that the integration and reconstruction of the support rod and surrounding bone tissues are not facilitated, and the long-term effect is poor. And to various improvements of supporting rod, for example the surface design is porous metal, designs for hollow structure can inject medicine etc. though improved bone to a certain extent and has grown into the ability, holistic bone tissue integration reconstruction effect still is not good enough to the supporting rod still has more limitation at present, for example: the support rod has longer length and high hardness, is inconvenient to be used together with other bone growth active fillers, is not easy to cut and take out, greatly increases the difficulty of the future total hip replacement, has high production cost, is not ideal for bone growth, and the like.

SUMMERY OF THE UTILITY MODEL

Therefore, an object of the present invention is to provide a bullet-shaped cage-shaped scaffold which can provide a permanent and strong mechanical support for the subchondral bone and can enhance the integration and reconstruction with the surrounding bone tissue.

The utility model provides a cage type support, include: head and somatic part, the surface of head is the arc surface, the somatic part is cylindric, head and somatic part body coupling are warhead shape, the head all has the hole on the surface with the somatic part, just the porosity of somatic part is greater than the porosity of head, be connected with the screw thread on the surface of somatic part, can improve the controllability of implanting the position in sclerotin tunnel screw in, can prevent again simultaneously to withdraw from by oneself.

The head part and the body part of the utility model are connected integrally to form a bullet head shape matched with the shape of the femoral head, the head part with the arc surface can improve the contact area of the subchondral bone of the femoral head to the maximum extent, the porosity of the head part is small, the elastic modulus is high, the strong mechanical supporting function can be played, and the collapse of the femoral head is prevented; the body has higher porosity, which is more favorable for the ingrowth of the surrounding bone tissue and ensures that the bracket is well integrated with the surrounding bone tissue.

Further, the cage-shaped stent is made of medical titanium alloy, medical cobalt alloy, medical tantalum alloy, medical magnesium alloy, medical stainless steel, medical niobium alloy or medical zirconium alloy.

Furthermore, the total length of the cage-shaped bracket is 20mm-100mm, the diameter is 5mm-20mm, and the thickness is 1mm-8 mm.

Further, the cage-type stent is internally provided with an inner cavity, and the diameter of the inner cavity is 1mm-20 mm.

Further, the porosity of the cage-shaped support is 30% -90%, and the pore diameter is 50-1000 um.

Further, the radian of the head is 1/6-1/3 pi.

Further, the elastic modulus of the head is 5Gpa to 50 Gpa.

Further, the body has an elastic modulus of 1GPa-10 GPa.

Further, a hexagon socket type screwdriver interface is arranged on the bottom surface of the body part.

Further, the side walls of the head and body have micro-holes.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic structural view of a cage-shaped stent according to an embodiment of the present invention;

fig. 2 is a schematic view illustrating an implantation of a cage-type stent into a femoral head necrosis area according to an embodiment of the present invention.

In the drawings are labeled:

1 head part

2 body part

3 screw thread

4 micro-pores

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

The embodiment of the utility model provides a cage type support, as shown in figure 1, include: head 1 and somatic part 2, the surface of head 1 is the arc surface, somatic part 2 is cylindricly, head 1 and somatic part 2 body coupling, head 1 and somatic part 2 all have the hole on the surface, just the porosity of somatic part 2 is greater than the porosity of head 1. Optionally, the cage-type scaffold is made of medical titanium alloy, medical cobalt alloy, medical tantalum alloy, medical magnesium alloy, medical stainless steel, medical niobium alloy or medical zirconium alloy, and is integrally formed by a metal 3D printing technology, a chemical vapor deposition technology, a physical vapor deposition technology and the like, and the cage-type scaffold is made of a metal material, so that the cage-type scaffold cannot be absorbed and degraded, and can provide permanent mechanical support for the cartilage surface and the subchondral bone in a femoral head necrosis area. The head part and the body part of the utility model are connected integrally to form a bullet head shape matched with the shape of the femoral head, the head part with the arc surface can improve the contact area of the subchondral bone of the femoral head to the maximum extent, the porosity of the head part is small, the elastic modulus is high, the strong mechanical supporting function can be played, and the collapse of the femoral head is prevented; the body has higher porosity, which is more favorable for the ingrowth of the surrounding bone tissue and ensures that the bracket is well integrated with the surrounding bone tissue.

It is emphasized that the entire scaffold is a cage-like structure, and the interior of the scaffold can be filled with bioactive materials, allogenic bones, artificial bones and the like, so as to promote the repair of surrounding bones. The body part can be provided with threads which can be screwed in the bone tunnel, thereby improving the controllability of the implantation direction and having the stabilizing function of preventing the body part from automatically withdrawing. Meanwhile, the side walls of the head part 1 and the body part 2 are provided with micropores 4, and the micropores 4 can allow the active factors in the stent to be slowly released.

In one aspect of the embodiment of the present invention, the cage-shaped stent has a total length of 20mm to 100mm, a diameter of 5mm to 20mm, and a thickness of 1mm to 20 mm; because the bullet head cage type bracket of the utility model has shorter length, even if the later stage needs to be replaced by the whole hip joint, the difficulty of osteotomy and operation can not be increased. Preferably, the cage-type stent is internally provided with an inner cavity, the diameter of the inner cavity is 1mm-8mm, and the inner cavity can allow filling of materials such as bone tissues, artificial bones and osteoinductive drugs, and promote repair and regeneration of femoral head necrosis areas.

The embodiment of the utility model provides an aspect, be provided with screwdriver interface 3 on the bottom surface of somatic part 2, screwdriver interface 3 is in evenly distributed on the bottom surface of somatic part 2, the screwdriver interface matches with supporting electric drill, makes things convenient for implantation in the art. The driver interface may be a hex socket type, but is not limited to a hex socket type driver interface.

Specifically, the porosity of the cage-shaped support is 30% -90%, the aperture is 50um-1000um, the radian of the head is 1/6-1/3 pi, the elastic modulus of the head is 5-50 GPa, and the elastic modulus of the body is 1-10 GPa. In a specific embodiment, the cage-type stent is installed in the femoral head at a position shown in fig. 2, the cage-type stent is prepared by using a metal 3D printing technology and is made of a metal titanium alloy, the total length of the bullet-head cage-type stent is 35mm, the diameter of the bullet-head cage-type stent is 10mm, the thickness of the bullet-head cage-type stent is 2mm, the porosity of the head part 1 is 40%, the porosity of the body part 2 is 70%, the surface radian of the head part is 1/6 pi, and the depth of the bottom screwdriver interface 3 is 1 mm.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (10)

1. A cage stent, comprising:

the outer surface of the head is an arc surface, the body is cylindrical, the head and the body are integrally connected into a bullet shape, pores are formed in the surface of the head and the surface of the body, the porosity of the body is larger than that of the head, and threads are connected to the outer surface of the body.

2. The cage stent of claim 1 wherein the material of said cage stent is a medical titanium alloy, a medical cobalt alloy, a medical tantalum alloy, a medical magnesium alloy, a medical stainless steel, a medical niobium alloy or a medical zirconium alloy.

3. A cage stent as claimed in claim 1 which has an overall length of 20mm to 100mm, a diameter of 5mm to 20mm and a thickness of 1mm to 8 mm.

4. A cage stent as claimed in claim 3 wherein the interior of the cage stent has a lumen with a diameter of 1mm to 20 mm.

5. The cage stent of claim 1 wherein said cage stent has a porosity of 30% to 90% and a pore size of 50um to 1000 um.

6. The cage stent of claim 1 wherein the curvature of said head is 1/6 Π -1/3 Π.

7. The cage stent of claim 1 wherein said head has an elastic modulus of 5Gpa to 50 Gpa.

8. The cage stent of claim 1 wherein said body has a modulus of elasticity of from 1Gpa to 10 Gpa.

9. Cage-type holder as claimed in claim 1, characterized in that the bottom surface of the body is provided with an internal hexagonal screwdriver socket.

10. A cage stent as defined in any one of claims 1 to 9 wherein the side walls of said head and body portions have micropores.

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