CN201394097Y

CN201394097Y - Artificial hip joint and femoral stem with low elastic modulus

Info

Publication number: CN201394097Y
Application number: CN2009201574351U
Authority: CN
Inventors: 张卫平
Original assignee: Beijing AK Medical Co Ltd
Current assignee: Beijing AK Medical Co Ltd
Priority date: 2009-06-01
Filing date: 2009-06-01
Publication date: 2010-02-03
Anticipated expiration: 2019-06-01

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

Artificial hip stem with low elasticity modulus

Technical field

This utility model relates to a kind of artificial hip stem with low elasticity modulus.

Background technology

The artificial hip joint replacing operation has become a kind of common relatively surgical operation in medical circle at present, but the metal material that is adopted mostly is rustless steel, titanium alloy, cobalt alloy, the pottery biology of use is also arranged, their common defectives are that elastic modelling quantity is too high, as titanium alloy is 110～120GPa, and rustless steel and cobalt alloy are then up to more than the 200GPa; And the elastic modelling quantity of cortical bone and spongy bone has only respectively about 15GPa and 1.5GPa.The elastic modelling quantity of metal material or ceramic material is tens times even tens times of osseous tissue, implant prosthese mechanical property and osseous tissue with above-mentioned material can't mate mutually, the load that high elastic modulus can make implant Periprosthetic osseous tissue bear is too small and then cause and bone resorption, osteanabrosis and disuse osteoporosis finally cause prosthetic loosening.

The utility model content

The purpose of this utility model provides a kind of artificial hip stem with low elasticity modulus to avoid owing to implant prosthese and the excessive sclerotin degenerate problem that causes of osseous tissue mechanical property gap.

For achieving the above object, this utility model is taked following design:

A kind of artificial hip stem with low elasticity modulus, it comprises head, cervical region and handle body, it is characterized in that, and the handle body is designed to hollow structure, and the handle surface is a plurality of holes or mesh-structured to guarantee that handle body inner hollow part keeps being communicated with the handle external body.

The utility model has the advantages that:

1, this utility model artificial hip stem with low elasticity modulus, it comprises head, cervical region and handle body, the handle body is designed to hollow structure, the handle surface is that a plurality of holes or mesh-structured so that handle body inner hollow part keep being communicated with the outside, fill broken osseous granules at the hollow bulb of handle body during use from body or allosome, by the time the broken osseous granules fusion growth of filling in outside osseous tissue and the handle body is integral its overall elastic modelling quantity of back can be very approaching with people's bone, effectively delay or avoid sclerotin to degenerate to take place between artificial hip joint femoral shaft and sclerotin to become flexible preventing.

2, this utility model artificial hip stem with low elasticity modulus, handle inside and outside surface all or the part have hydroxyapatite coating layer, have the function of inducing the osteocyte growth.

3, this utility model artificial hip stem with low elasticity modulus, it uses medical metal or bioceramic to make, so it has good biocompatibility.

Description of drawings

Fig. 1 is this utility model embodiment one contour structures sketch map (its handle body is a plurality of pore structures)

Fig. 2 is the hollow structure sketch map of this utility model embodiment one

Fig. 3 is this utility model embodiment two contour structures sketch maps (its handle body is a plurality of pore structures)

Fig. 4 is the hollow structure sketch map of this utility model embodiment two

Fig. 5 is this utility model embodiment three structural representations (its handle body is a plurality of holes and mesh integrated structure)

Fig. 6 fills broken osseous granules sketch map for this utility model handle body hollow space

The specific embodiment

As Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, shown in Figure 6, a kind of artificial hip stem with low elasticity modulus of this utility model, it is characterized in that, it comprises head 1, cervical region 2 and handle body 3, handle body 3 is designed to hollow structure, handle body 3 surfaces are hole 4 or mesh 5 structures so that handle body 3 inner hollow part keeps being communicated with the outside, the quantity in hole 4 and shape can design according to the dimensions and the stressing conditions of handle body 3, the quantity of mesh 5 and shape can design according to the dimensions and the stressing conditions of handle body 3, mesh can be designed to monolayer, also can be designed to multilamellar, leave opening 7 at handle body 3 far-ends, it is standby as required broken osseous granules 6 to be packed into the hollow part of handle body 3 from opening 7 and hole 4 by the doctor before the operation.

The processing method that this utility model artificial hip stem with low elasticity modulus adopts is: adopt laser or high-power electron beam processing method melt molding, perhaps use die casting, investment casting method molding, can also cast or artificial hip joint femoral shaft blank surface etch, the burn into of forging molding bores and mill out needed hole and mesh with methods such as spark machined, chemical attack, machine drilling cuttings, also can obtain required structure in addition with powder sintering method.

At first patient's femoral bone cavitas medullaris is cleared up plastotype operation Shi doctor with specific purpose tool, an amount of with packing in this utility model artificial hip stem with low elasticity modulus then from body or the broken osseous granules 6 of allosome, the reuse specific purpose tool is squeezed into pulp cavity to the precalculated position with artificial hip stem with low elasticity modulus, artificial hip stem with low elasticity modulus handle body 3 and sclerotin in the pulp cavity are tightly pushed, postoperative treat sclerotin pass broken osseous granules 6 that hole 4 and mesh 5 and handle body 3 be implanted into gradually fusion growth be integral the back artificial hip stem with low elasticity modulus and will obtain to stablize good long term preventing and become flexible.

This utility model artificial hip stem with low elasticity modulus uses has the material manufacture of good biocompatibility, adopts medical metal or bioceramic etc. to make as it.

The surface of handle body 3 has the hydroxyapatite coating layer that can induce osteocyte to grow into, and this hydroxyapatite coating layer can adopt conventional plasma spraying method or the heavy collection method of electrochemistry to form.

Claims

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.