CN209548147U

CN209548147U - A kind of liner for metal acetabulum

Info

Publication number: CN209548147U
Application number: CN201821742679.1U
Authority: CN
Inventors: 李之琛; 卢伟杰
Original assignee: First Affiliated Hospital of Guangzhou Medical University
Current assignee: First Affiliated Hospital of Guangzhou Medical University
Priority date: 2018-10-26
Filing date: 2018-10-26
Publication date: 2019-10-29
Anticipated expiration: 2028-10-26

Abstract

The utility model discloses a kind of liners for metal acetabulum, the liner is hemispherical shell, the inner and outer wall of the liner is smooth sphere, the liner is for being mounted at the inner cavity of metal acetabulum, it is characterized in that, the outer diameter of the liner be less than metal acetabulum intracavity diameter, it is described in be lined with mortise, the mortise is distributed on the outer wall of the liner, and the mortise does not penetrate the liner.The utility model structure is simple, can directly replace original liner having worn out, be firmly bonded between liner and metal acetabulum, it is not easy to produce relative sliding.

Description

A kind of liner for metal acetabulum

Technical field

The utility model relates to orthopedic medical device technical fields, more particularly to a kind of liner for metal acetabulum.

Background technique

Hip joint is one of human body maximum and most important joint, subjects the upper part of the body weight of entire body, due to The cartilage surface at joint both ends, can with the age, heredity, denaturation, cross with and damage cause coarse denaturation, it is therefore desirable to do joint and set Hand-off art, artificial total hip arthroplasty be it is current solve patient pain and the most effective operative treatment mode of dysfunction it One, wherein acetabular component is the important application component in artificial total hip arthroplasty.

Currently, common acetabular bone liner is by bayonet unit or interference fit, this requires acetabular cup inner surface and acetabular bones Liner outer surface requirement on machining accuracy is high, and there is a possibility that loosening to a certain extent, can aggravate acetabular bone liner appearance The abrasion in face simultaneously generates particle, these particles may induce bone to dissolve, and has an impact to articular prosthesis surrounding bone bed mass, and And when the abrasion of acetabular bone liner must just be overhauled to a certain extent, when overhauling, due to lacking the liner of adaptation, ordinary circumstance Under, need to increase together with metal acetabulum integral replacing the complexity of operation.

Utility model content

The purpose of the utility model is to provide a kind of liner for metal acetabulum, which can directly be replaced Original liner having worn out is changed, and can prevent replaced liner and metal acetabulum from opposite sliding occurs.

The purpose of this utility model is realized by technical solution below:

A kind of liner for metal acetabulum, the liner are hemispherical shell, and the outer wall and inner wall of the liner are Smooth sphere, the liner is for being mounted at the inner cavity of metal acetabulum, which is characterized in that the outer diameter of the liner is less than metal The intracavity diameter of acetabular bone, it is described in be lined with mortise, the mortise is distributed on the outer wall of the liner, and the mortise does not penetrate The liner.

Based on the above technical solution, the utility model can do following improvement:

The number of mortise described in the utility model be 4~8, thus further increase liner connect with acetabular bone it is secured Degree.

Mortise described in the utility model is distributed around the axial line isogonism of the liner, to keep liner stress more equal It is even.

The diameter of mortise described in the utility model is 3~4mm, so as to accommodating portion bone cement, prevent liner with It is slided between metal acetabulum.

Liner described in the utility model is that high crosslinked polyethylene liner prolongs to reduce the abrasion of liner and femoral head Long prosthese service life.

Compared with prior art, the utility model technology has the advantage that

(1) the metal acetabulum liner of the utility model can directly replace original liner having worn out, and be suitable for difference The metal acetabulum of internal diameter does not need integral replacing metal acetabulum, reduces the damage to patient, reduces the financial burden of patient；

(2) it is lined with mortise in the metal acetabulum of the utility model, is bonded between liner and acetabular bone by bone cement, there is portion It is solidified after dividing bone cement to enter mortise, so that it is stronger in acetabular bone to be mounted on liner, avoids occurring to slide relatively, reduce mill Damage, prolongs the service life.

Detailed description of the invention

The utility model is described in further details in the following with reference to the drawings and specific embodiments

Fig. 1 is structural schematic diagram of the utility model for the liner of metal acetabulum；

Fig. 2 is the schematic diagram of the section structure of the utility model for the liner of metal acetabulum；

Fig. 3 is the schematic diagram that the utility model is mounted on metal acetabulum for the liner of metal acetabulum.

Label on attached drawing: 1- outer wall, 2- inner wall, 3- mortise, 4- metal acetabulum, 5- bone cement.

Specific embodiment

Such as Fig. 1~3, a kind of liner for metal acetabulum of the present embodiment, which is hemispherical shell, liner it is outer Wall 1 and inner wall 2 are smooth sphere, and the outer diameter of liner 2 is 40mm, internal diameter 28mm, in the metal acetabulum 4 for installing liner The diameter of chamber is 45mm, and the outer diameter 1 of liner is less than the intracavity diameter of metal acetabulum 4；4 mortises are lined in the present embodiment 3, the diameter of mortise 3 is 4mm, and 4 mortises 3 are distributed on the outer wall 1 of liner with the axial line isogonism of liner, and mortise 3 is not Penetrate liner；Therefore, the liner overall structure of the present embodiment is simple, and can prevent liner and metal acetabulum 4 from occurring relatively Sliding.

When the abrasion of the original acetabular bone liner of patient needs to repair, can directly be carried out more with the liner in the present embodiment It changes, only need to remove former liner before replacement, and remove substance intracavitary in metal acetabulum 4, then by bone cement 5 directly this reality It applies the liner in example to be bonded in metal acetabulum 4, during bonding, liner is squeezed, and part bone cement 5 can enter tenon In hole 3, after bone cement 5 solidifies, liner can be fixed, the adhesion firmness between liner and metal acetabulum 4 is high.

Liner is made using high crosslinked polyethylene in the present embodiment, is not only able to improve the wear resistance of liner, thus Extend prosthese service life, reduces the financial burden of patient.

The above embodiments of the present invention is not the restriction to scope of protection of the utility model, the reality of the utility model It is without being limited thereto to apply mode, all this kind above content according to the present utility model, according to the ordinary technical knowledge of this field and used With means, under the premise of not departing from the utility model above-mentioned basic fundamental thought, the utility model above structure is made its The modification, replacement or change of its diversified forms, shall fall within the scope of the present invention.

Claims

1. a kind of liner for metal acetabulum, the liner is hemispherical shell, and the outer wall and inner wall of the liner are light Sliding spherical surface, the liner is for being mounted at the inner cavity of metal acetabulum, which is characterized in that the outer diameter of the liner is less than metal hip The intracavity diameter of mortar, it is described in be lined with mortise, the mortise is distributed on the outer wall of the liner, and the mortise does not penetrate institute State liner.

2. the liner according to claim 1 for metal acetabulum, which is characterized in that the number of the mortise is 4~8 It is a.

3. the liner according to claim 2 for metal acetabulum, which is characterized in that the mortise is with the axis of the liner Heart line isogonism is distributed on the outer wall of the liner.

4. the liner of metal acetabulum is used for described in any one claim according to claim 1~3, which is characterized in that described The diameter of mortise is 3~4mm.

5. the liner according to claim 1 for metal acetabulum, which is characterized in that the liner is high crosslinked polyethylene Liner.