JPS58216051A - Molar crown socket - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an acetabular socket for use in an artificial hip joint.

As a conventional acetabular socket, JP-A-54-26098
Bone white prosthesis materials such as those described in the No. The aim was to prevent the prosthetic phase from swinging during fixation and to prevent cement from extruding.

The asymmetrical 7-lunge serves only as a cement formwork, and after leaving the bed, it is in a state of lumen support with low support, so bone whitening often occurs over a long period of time. It had the disadvantage of sinking completely into the pelvis.

In addition, various structures other than the acetabular socket described above are known, but all of them have a structure that supports the lumen with low supporting force, and no matter how much cement filling, etc. However, the cement ruptured and the acetabular socket sank into the pelvis, making it difficult to walk and requiring revision surgery, a major drawback.

To explain the conventional acetabular socket in more detail, looking at the bone structure around the hip joint, the inner and outer surfaces of the pelvic bone are made up of strong cortical bone, but the internal medullary cavity is made of strong cortical bone. filled with low cancellous bone. However, in the case of a conventional acetabular socket that lacks a strong flange, if the foot palate floor fatigues and loses its supporting force over a long period of time, the medullary cavity, which has extremely weak supporting force, forms beneath it. Instead, the acetabular socket and the acrylic resin cement that fixed it had sunk into the pelvic bone.

In other words, if the acetabular socket is supported by a lumen with a low supporting force, it is extremely disadvantageous for long-term support.

The present invention was made in view of the drawbacks of the acetabular socket of the conventional structure as described above, and an object of the present invention is to provide a structure that allows the acetabular socket to be supported by the highly strong cortical bone of the pelvis. By using this configuration, it is possible to achieve long-term fixation without sinking of the acetabular socket, and it is also possible to easily perform recirculation surgery. The present invention consists in providing an acetabular socket with a point.

That is, the present invention includes a partial spherical part using a part of a spherical body and a flange part protruding from the open end of the spherical part to the outer periphery, and a support that does not deform under a force of about 3 to 5 times the body weight. It is composed of an outer shell member having a force and an inner member having a spherical receiving part, and is characterized in that the inner part shrine is fitted into the inner surface of the partial spherical part to provide integrity. .

The invention will now be explained by way of illustrative embodiments. 1, 2, and 3 are diagrams showing a first embodiment of the present invention, in which FIG. 1 is a front view of the first embodiment, FIG. 2 is a sectional view of the same side, and FIG. FIG. 3 is an explanatory diagram of the usage state of the same side.

First, to explain the structure, l is an outer skin member in which a partial spherical part 1a and a flange part 1b are integrally molded, and the partial spherical part 1a is a part of a sphere, and is slightly larger than a hemisphere. It is formed.

The flange portion 1b uniformly protrudes from the open end of the first spherical portion 1a toward the outer periphery, and has an inclination angle θ from the horizontal plane toward the partial spherical portion 1a, so as to fit into the pelvis. Further, the outer surface of the spherical portion 1a is smooth, and the outer skin member 1 is formed with stainless steel having a constant thickness as the bare side.

Reference numeral 2 denotes an interior member having a spherical receiving portion 2a, which supports the femoral head S' of the femoral stem S in a spherical manner. Moreover, polyethylene resin is used as the material for the interior member 2.

Furthermore, the outer skin member l and the interior member 2 are
is fitted onto the inner surface of the partial spherical part 1a to give it integrity.The fitting may be done by the deformation force of the interior member 2, or by interposing an adhesive between both members 1.2. It may also be fitted.

Next, to explain the operation, as shown in FIG. 3, when replacing the acetabular socket, the partial spherical part 1a of the socket is pushed into the cartilage part h' of the pelvis H.

Replacement surgery can be performed simply by arranging the 7-rank portion 1b so as to abut the cortical bone of the pelvis H.

In other words, even when a person leaves the bed and walks, etc., the acetabular socket does not need to be particularly fixed because it only receives an upward force from the femoral head S' of the femoral stem S, and the acetabular socket of the present invention The socket has high-strength cortical bone support, and since the outer skin member 1 has a supporting force that does not deform even under a force of 3 to 5 times the body weight, the socket sinks into the pelvis H together with the acetabular socket. , it is possible to stably fix the palatal socket for one length of time.

In addition, what is shown by H in FIG. 3 is the large l1tU bone, and C is the cement for fixing the femoral stem.

Next, the second embodiment shown in FIG. 4 will be described. FIG. 4 is a sectional view showing the acetabular socket of the second embodiment.

First, regarding the structure, the partial spherical part 1a and the 7-rank part 1b constituting the outer skin member 1 are formed separately, and the open end of the partial spherical part 1a is the locking bent end 1a'. In this case, the rivers can be combined together. The structure other than the outer skin member 1 is the same as that of the first embodiment.Next, as for the operation, similar to the first embodiment, there is no need to make a hole in the pelvis H or fill it with cement, and it is very easy to use. It is possible to perform acetabular socket replacement surgery and to stably fix the acetabular socket for a long period of time.

Next, the third embodiment shown in FIGS. 5 and 6 will be explained. FIG. 5 is a sectional view showing the acetabular socket of the third embodiment, and FIG. 6 is an explanatory diagram of the socket in use. .

First, regarding the structure, the partial spherical portion 1 of the outer skin member l
Roughness 1a'' is formed on the outer surface of a to improve fixation to cement.

Note that the configuration other than the outer skin member 1 is the same as that of the first embodiment.

Next, to explain the effect, as shown in Figure 6,
When replacing the acetabular socket, a hole is made in the pelvis H, filled with cement C, and the partial spherical part 1a is pushed into the cement C) so that the flange part 1b is embedded in the cortical bone of the pelvis H. Replacement surgery is performed by placing them in contact with each other.

In other words, the unevenness 1a'' formed on the outer surface of the partial spherical portion 1a
This ensures cement fixation of the acetabular socket, and this embodiment is used when the cartilage h' is severely damaged or deformed and, as shown in Figure 3, it is not possible to perform trench replacement directly. It is something.

Therefore, even in the third embodiment, since the acetabular socket is supported by cortical bone with high strength, the acetabular socket can be stably fixed for a long period of time.

Although the acetabular socket of the present invention has been described above with reference to the embodiments illustrating the socket, the specific structure is not limited to the embodiments. For example, the outer skin member may be made of a material other than stainless steel. The interior member may also be made of titanium alloy, ceramic, etc., and the material of the interior member may also be a synthetic resin other than polyethylene resin. Further, the protrusion length and protrusion angle of the flange portion are also appropriately set in consideration of cortical bone support.

Further, a ceramic coating may be applied to the outer surface of the outer skin member, and in this case, affinity with bone tissue can be improved.

Additionally, the surface of the flange facing toward the partial sphere may be coated with a buffering material made of synthetic resin (polyethylene, etc.); in this case, supporting contact with the cortical bone is made in surface contact, ensuring reliable support. At the same time, bone erosion that occurs in the case of point contact can be prevented.

As described above, according to the present invention, it is possible to achieve stable socket fixation for a long period of time without the acetabular socket itself sinking, and the acetabular socket can be easily replaced.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the first embodiment of the acetabular socket of the present invention, Fig. 2 is a cross-sectional view of the same embodiment, Fig. 3 is an illustration of the usage state of the same embodiment, and Fig. 4 is the present invention. FIG. 5 is a sectional view showing a third embodiment of the acetabular socket of the present invention, and FIG. 6 is an explanatory view of the same embodiment in use. 1. Outer skin member, 1a. Partial spherical part, lb.. 7 rank part, 2. Interior member.

Claims (1)

[Claims] 1) It is equipped with a partial spherical part using the -- part of a spherical body and a flange part protruding from the open end of the spherical part to the outer periphery, and has a weight three times the body weight. It is composed of an outer skin member that has a supporting force that does not deform under a force of about 5 times, and an inner part system that is equipped with a spherical receiving part, and by fitting the inner member to the inner surface of the partial spherical part, it is integrated. An acetabular socket characterized by having a . 2) Acetabular socket 1 according to claim 1, in which the flange part has an inclination angle from the horizontal plane toward the partial spherical part 3) Claim tfJ1, in which the partial spherical part and the flange part are integrally formed The palatal socket according to item 1 or 2. 4) The acetabular socket according to claim 1 or 2, wherein the partial spherical part and the flange part are formed separately so that they can be integrally combined. 5) The acetabular socket according to claim 1, 2, 3, or 4, wherein the outer surface of the partial spherical portion is smooth with no irregularities. 6) The palatal socket according to claim 1, 2, 3, or 4, wherein the outer surface of the partially spherical portion is formed with irregularities. 7) The material of the outer skin member is stainless steel, and the material of the interior member is polyethylene. Range of requirements for characteristic N tF' Items 1, 2, 3, 4, 5, or 6 The acetabular socket of the recorder. 8) The acetabular socket according to claims 1 to 7, wherein the outer skin member is coated with a ceramic coating. 9) Claim 1 in which the surface of the flange portion facing the partial sphere portion is coated with a cushioning material made of synthetic resin.
The acetabular socket according to items 8 to 8.