CN201394097Y - Low Elastic Modulus Artificial Hip Joint Femoral Stem - Google Patents

Abstract

The utility model relates to an artificial hip joint and femoral stem with low elastic modulus, which comprises a head, a neck and a handle body, wherein the handle body is designed into a hollow structure, the surface of the handle body has a plurality of holes and a mesh structure to guarantee that the hollow part in the handle body is communicated with the external, autologous or xenogenous broken bone granules are filled in the hollow part of the handle body before the implantation surgery, after the external bony tissues are fused and integrated with the broken bone granules in the handlebody, the whole elastic modulus can very approach to the that of the human bone to effectively prevent the loosening between the artificial hip joint and femur shaft and the bone for long.

Description

Low Elastic Modulus Artificial Hip Joint Femoral Stem

technical field

The utility model relates to a low elastic modulus artificial hip joint femoral handle.

Background technique

Artificial hip replacement surgery has become a relatively common surgical operation in the medical field, but the metal materials used are mostly stainless steel, titanium alloy, cobalt alloy, and biological ceramics are also used. Their common defect is that the elastic modulus is too high. High, such as titanium alloy is 110 ~ 120GPa, stainless steel and cobalt alloy is as high as 200GPa or more; while the elastic modulus of cortical bone and cancellous bone is only about 15GPa and 1.5GPa respectively. The elastic modulus of metal materials or ceramic materials is more than ten times or even dozens of times that of bone tissue. The mechanical properties of the implant prosthesis made of the above materials cannot match the bone tissue, and the high elastic modulus will make the implant false. Too little load on the surrounding bone tissue causes bone resorption, bone atrophy, and disuse osteoporosis, eventually leading to loosening of the prosthesis.

Utility model content

The purpose of the utility model is to provide a low elastic modulus artificial hip joint femoral stem to avoid the problem of bone degeneration caused by the large gap between the mechanical properties of the implant prosthesis and the bone tissue.

In order to achieve the above object, the utility model takes the following design scheme:

A low elastic modulus artificial hip joint femoral handle, which includes a head, a neck and a handle body, is characterized in that the handle body is designed as a hollow structure, and the surface of the handle body is a multi-hole or mesh structure to ensure that the inside of the handle body The hollow part is kept in communication with the outside of the handle body.

The utility model has the advantages of:

1. The low elastic modulus artificial hip joint femoral handle of the utility model includes a head, a neck and a handle body. The handle body is designed as a hollow structure, and the surface of the handle body is a multi-hole or mesh structure so that the inside of the handle body is hollow. The part is kept in communication with the outside, and the hollow part of the handle body is filled with autologous or allogeneic bone granules during use. After the external bone tissue and the bone granules filled in the handle body are fused and grown into one, its overall elastic modulus can be compared with that of It is very close to the human bone, effectively delaying or avoiding bone degeneration to prevent loosening between the femoral stem of the artificial hip joint and the bone.

2. The low elastic modulus artificial hip joint femoral stem of the present invention has hydroxyapatite coating on all or part of the internal and external surfaces of the stem, which has the function of inducing bone cell growth.

3. The low elastic modulus artificial hip joint femoral stem of the present invention is made of medical metal or bioceramics, so it has good biocompatibility.

Description of drawings

Fig. 1 is a schematic diagram of the appearance structure of Embodiment 1 of the utility model (the handle body is a plurality of hole structures)

Fig. 2 is the hollow structure schematic diagram of the utility model embodiment one

Fig. 3 is a schematic diagram of the appearance structure of Embodiment 2 of the utility model (the handle body is a plurality of hole structures)

Fig. 4 is the hollow structure schematic diagram of the second embodiment of the utility model

Fig. 5 is a structural schematic diagram of the third embodiment of the utility model (the handle body is a combination structure of multiple holes and meshes)

Fig. 6 is a schematic diagram of the hollow part of the handle body of the present invention filled with broken bone particles

Detailed ways

As shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6, a low elastic modulus artificial hip femoral stem of the utility model is characterized in that it includes a head 1, a neck 2 and a The handle body 3, the handle body 3 is designed as a hollow structure, the surface of the handle body 3 is a structure of holes 4 or meshes 5 so that the inner hollow part of the handle body 3 is kept in communication with the outside, the number and shape of the holes 4 can be adjusted according to the size of the handle body 3 Specifications and stress conditions, the number and shape of the mesh 5 can be designed according to the size specifications of the handle body 3 and the stress situation, the mesh can be designed as a single layer, or can be designed as multi-layer, in the handle body 3 far There is an opening 7 at the end, and the doctor fills the bone fragments 6 from the opening 7 and the hole 4 into the hollow part of the handle body 3 according to the needs before the operation.

The processing method adopted by the low elastic modulus artificial hip joint femoral handle of the utility model is: adopt laser or high-energy electron beam processing method to melt and form, or use die-casting, investment casting method to form, can also use electric spark machining, chemical corrosion, mechanical Drilling and cutting are used to etch, corrode, drill and mill the required holes and meshes on the surface of the artificial hip joint femoral stem blank that has been cast or forged. In addition, the required structure can also be obtained by powder sintering.

During the operation, the doctor first uses a special tool to clean and shape the patient's femoral medullary cavity, and then puts an appropriate amount of autologous or allogeneic bone fragments 6 into the femoral stem of the low elastic modulus artificial hip joint of the present invention, and then uses a special tool to place the low The elastic modulus artificial hip joint femoral stem is driven into the medullary cavity to the predetermined position, so that the low elastic modulus artificial hip joint femoral stem body 3 is tightly squeezed with the bone in the medullary cavity, and the bone will pass through the hole after surgery. 4 and the mesh 5 and the broken bone particles 6 implanted in the handle body 3 are gradually fused and grown into one, and the low elastic modulus artificial hip joint femoral handle will obtain good long-term stability to prevent loosening.

The low elastic modulus artificial hip joint femoral handle of the utility model is made of materials with good biocompatibility, for example, it is made of medical metal or bioceramics.

The surface of the handle body 3 has a hydroxyapatite coating that can induce bone cells to grow in, and the hydroxyapatite coating can be formed by conventional plasma spraying or electrochemical deposition.

Claims (10)

1, a kind of artificial hip stem with low elasticity modulus, it is characterized in that, it comprises head (1), cervical region (2) and handle body (3), handle body (3) is a hollow structure, handle body (3) surface is provided with hole (4) and mesh (5), handle body (3) inner hollow partly is communicated with outside the maintenance by hole (4) and mesh (5), leaves opening (7) at handle body (3) far-end.

2, artificial hip stem with low elasticity modulus according to claim 1 is characterized in that, leaves opening (7) at handle body (3) far-end.

3, artificial hip stem with low elasticity modulus according to claim 1 is characterized in that, the quantity of hole (4) and shape can design according to the dimensions and the stressing conditions of handle body (3).

4, artificial hip stem with low elasticity modulus according to claim 1 is characterized in that, hole (4) are arranged in all surfaces of handle body (3).

5, artificial hip stem with low elasticity modulus according to claim 1 is characterized in that, mesh (5) is arranged in all surfaces of handle body (3).

6, artificial hip stem with low elasticity modulus according to claim 1 is characterized in that, hole (4) are arranged in the part surface of handle body (3).

7, artificial hip stem with low elasticity modulus according to claim 1 is characterized in that, mesh (5) is arranged in the part surface of handle body (3).

8, artificial hip stem with low elasticity modulus according to claim 1 is characterized in that, hole (4) and mesh (5) can be arranged in the surface of handle body (3) simultaneously.

9, artificial hip stem with low elasticity modulus according to claim 1 is characterized in that, it adopts medical metal or bioceramic to make.

10, artificial hip stem with low elasticity modulus according to claim 1 is characterized in that, the surfaces externally and internally of handle body (3) has hydroxyapatite coating layer.

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