JP2010051504A - Component for artificial hip joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve an initial fixing property and facilitate processes of inserting to a thigh bone and pulling out of the thigh bone. <P>SOLUTION: A pair of front and rear surfaces (12, 13) has a pair of front and rear surfaces (16, 17) mounted on the proximal side and a pair of front and rear surfaces (18, 19) mounted on the distal side under a condition of implantation in a thigh bone. The pair of front and rear surfaces (16, 17) at the proximal side and the pair of front and rear surfaces (18, 19) at the distal side are formed to be different in inclination in the axial direction. A pair of border lines (20, 21) partitions each surface of the pair of front and rear surfaces (16, 17) at the proximal side and the pair of front and rear surfaces (18, 19) at the distal side and elongates from the inside to the outside, and includes an elongating part to the direction inclined in a vertical direction to the axial direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a component for an artificial hip joint used as a stem member formed in a rod shape in which one end side is implanted in a femur in an artificial hip joint.

  Conventionally, an operation in which an artificial hip joint is applied is performed on a patient who has an abnormality in a femur in a hip joint due to a disease such as osteoarthritis of the hip or rheumatoid arthritis. As such an operation, a femoral head ball member formed on the acetabular side of the femur and formed into a ball shape, and a component for an artificial hip joint as a stem member formed in a rod shape in which one end side is implanted in the femur; Hip arthroplasty (THA: Total Hip Arthroplasty) has been performed in which a hip joint is replaced with an artificial hip joint.

  As described above, what is disclosed in Patent Document 1 is known as a component for an artificial hip joint used as a stem member in an artificial hip joint. The component for an artificial hip joint disclosed in Patent Document 1 has a pair of front and back surfaces arranged to face the front side and the rear side of the human body in a state of being implanted in the femur, and in a state of being implanted in the femur. A pair of inner and outer surfaces are formed so as to face the inner side and the outer side in the left-right direction of the human body. The component for an artificial hip joint is configured to have a substantially rectangular cross section in which a pair of front and rear surfaces and a pair of inner and outer surfaces are formed. As a result, this artificial hip joint component is intended to be fixed in the bone so as to bite into the cortical bone with a substantially rectangular cross section in the initial stage of implantation in the femur.

  The component for an artificial hip joint disclosed in Patent Document 1 is fixed in the bone at the initial stage of being implanted in the femur by a biting action with a substantially rectangular cross section (hereinafter referred to as “initial fixability”). Is to secure. However, further improvement in initial fixability is required for the artificial hip joint component of Patent Document 1. Then, what was disclosed by patent document 2 is known as a component for artificial hip joints aiming at the improvement of initial fixability. In Patent Document 2, an uneven shape is formed on the pair of front and rear surfaces, and the outer surface of the pair of inner and outer surfaces that protrudes outwardly from the proximal portion of the outer surface in the left-right direction is greatly extended outward. A hip prosthesis component is disclosed in which a raised portion is formed. In this artificial hip joint component, the provision of the pair of concave and convex shapes on the front and rear surfaces and the large protruding portion on the outer surface in this way improves the initial fixation. In the following description, a position on the human body that is relatively close to the heart is referred to as “proximal”, and a position on the far side is referred to as “distal”.

US Pat. No. 5,156,627 European Patent Application Publication No. EP1070490A1

  In hip replacement, when embedding hip prosthetic components in the femur, a hole is formed in the medullary cavity of the femur using a surgical device such as a rasp or chisel. The artificial hip joint component is inserted into the hole. However, in the case of the artificial hip joint component disclosed in Patent Document 2 described above, the pair of front and rear surfaces are provided with an uneven shape, and further, the outer surface is provided with an overhanging portion that protrudes outward, so that the femoral bone The operation of inserting into a hole formed in the medullary cavity tends to be difficult. And, when forming a hole in the medullary cavity of the femur, it is necessary to make it a shape corresponding to the uneven shape of the pair of front and rear surfaces and the large overhanging portion of the outer surface. There is a risk of inviting. In addition, when an infection or the like develops after hip replacement, an operation for removing the hip prosthesis component is required. In this case, if the prosthetic hip joint component has a pair of concavo-convex shapes on the front and rear surfaces and a large overhanging portion on the outer surface, these shape configurations hinder the extraction work, which requires considerable labor in the extraction work. There is a problem of end.

  In view of the above circumstances, the present invention provides an artificial hip joint component capable of improving initial fixation and facilitating insertion into and removal from the femur. For the purpose.

  A component for an artificial hip joint according to the first invention for achieving the above object is a component for an artificial hip joint used as a stem member formed in a rod shape in which one end side is implanted in the femur in an artificial hip joint, A pair of front and rear surfaces arranged to face the front side and the back side of the human body when implanted in the body, and to face the inside and outside in the left-right direction of the human body when implanted in the femur And a pair of inner and outer surfaces are formed. And the component for artificial hip joints which concerns on 1st invention is a pair of proximal part side front-and-rear surface and a distal part side which are arrange | positioned in the proximal part side in the state which said pair front-and-back surface was embedded by the femur A pair of distal portion side front and back surfaces, and the pair of proximal portion side front and back surfaces and the pair of distal portion side front and back surfaces are axes extending in a rod shape in the stem member A pair of boundary lines that are formed as surfaces having different inclinations with respect to the direction and that define each surface of the pair of proximal portion side front and back surfaces and each pair of the distal portion side front and back surfaces, A portion extending toward the outside and extending in a direction inclined with respect to a direction perpendicular to the axial direction is included.

  According to the present invention, the pair of front and rear surfaces and the pair of inner and outer surfaces are formed, so that the cross section of the artificial hip joint component is formed in a substantially rectangular shape. The pair of front and rear surfaces are composed of a pair of proximal portion side front and back surfaces and a pair of distal portion side front and back surfaces, which are formed as surfaces having different inclinations with respect to the axial direction. For this reason, compared to the case where a pair of front and rear surfaces are formed as uniformly inclined surfaces, sinking resistance that is less likely to sink along the hole formed in the medullary cavity and is a stable position in the axial direction. Can greatly improve the performance. In addition to the fact that the pair of proximal portion side front and back surfaces and the pair of distal portion side front and back surfaces have different inclinations with respect to the axial direction, the pair of boundary lines that divide these surfaces are perpendicular to the axial direction. It is formed so that the part extended in the direction which inclines with respect to may be included. For this reason, in addition to a significant improvement in sinking resistance due to the resistance of the surfaces that have different inclinations and cross at an angle, sufficient resistance to rotation, which is the stability of the position in the rotational direction around the axial direction, is ensured. Can do. Thereby, it is possible to improve the sinking resistance and the rotation resistance, which are indexes of initial fixability, and it is possible to improve the initial fixability.

  And as mentioned above, the component for artificial hip joints of this invention is comprised so that initial fixation may improve with a pair of front-and-back surface comprised including the surface which cross | intersects diagonally different in inclination. For this reason, a shape configuration that makes it difficult to insert the artificial hip joint component into the hole formed in the medullary cavity of the femur (a pair of front and rear concavo-convex shapes and a large overhanging portion of the outer surface as in the prior art) Etc.) is not provided. Thereby, the insertion operation to the femur of the artificial hip joint component can be easily performed. Moreover, when forming a hole in the medullary cavity, it is only necessary to form a hole having a shape corresponding to a pair of anterior and posterior surfaces that have different inclinations and cross each other at an angle. The possibility of causing breakage can also be suppressed. In addition, the pair of front and back surfaces that improve the initial fixability has a shape configuration that makes the work of removing the artificial hip joint component from the femur difficult (ie, the pair of front and back surfaces as in the prior art). No shape configuration such as uneven shape or a large overhanging portion of the outer side surface is provided. For this reason, the extraction operation from the femur of the artificial hip joint component can be easily performed.

  Therefore, according to the present invention, it is possible to provide a component for an artificial hip joint that can improve the initial fixability and can facilitate the operation of inserting into and removing from the femur.

  The component for an artificial hip joint according to a second aspect of the present invention is the component for an artificial hip joint according to the first aspect, wherein the pair of proximal portion side front and back surfaces are inclined with respect to the axial direction rather than the pair of distal portion side front and back surfaces. Is large.

  According to the present invention, the pair of proximal portion side front and back surfaces are formed so as to have a larger inclination with respect to the axial direction than the pair of distal portion side front surfaces. In this way, it is possible to constitute a component for an artificial hip joint having a shape whose cross-sectional area is greatly enlarged. On the other hand, the medullary cavity of the femur generally has a form in which the area expands from the distal part side to the proximal part side, so that the cross section of the proximal part side is larger than the distal part side. By using the artificial hip joint component, it becomes easy to realize an artificial hip joint component having a shape more suitable for the form of the medullary cavity, and the initial fixation can be further improved.

  The component for an artificial hip joint according to a third aspect of the present invention is the component for an artificial hip joint according to the first or second aspect, wherein the pair of boundary lines extends from the inner side toward the outer side and is perpendicular to the axial direction. A portion extending in a direction from the proximal side toward the distal side with respect to the direction is included.

  According to the present invention, the pair of boundary lines includes a portion extending from the proximal side toward the distal side toward the outer side from the inner side to the outer side. A component for an artificial hip joint having an enlarged shape can be formed. On the other hand, since the medullary cavity of the femur generally has a form in which the area expands toward the outside on the proximal side, a component for an artificial hip joint in which the area of the front and back surfaces of the pair of proximal parts is increased on the outside is used. As a result, it becomes easier to realize an artificial hip joint component having a shape more suitable for the shape of the medullary cavity, and the initial fixation can be further improved.

  The artificial hip joint component according to a fourth aspect of the present invention is the artificial hip joint component according to any one of the first to third aspects of the present invention, wherein the pair of boundary lines is between the pair of boundary lines from the inner side toward the outer side. And a portion extending in a direction inclined with respect to a direction perpendicular to the axial direction.

  According to the present invention, the pair of boundary lines includes a portion extending while inclining while the distance between the pair of boundary lines increases from the inner side toward the outer side, so that the cross-sectional area expands more greatly on the outer side than on the inner side. A shaped hip joint component can be constructed. On the other hand, since the medullary cavity of the femur generally has a form in which the area expands from the inside to the outside, the medullary cavity part can be obtained by using a component for a hip prosthesis having a cross section that is larger than the inside. It is easy to realize a component for an artificial hip joint having a shape that is more suitable for the above-described form, and the initial fixability can be further improved.

  The artificial hip joint component according to a fifth aspect of the present invention is the artificial hip joint component according to any one of the first to fourth aspects of the present invention, wherein the inner surface of the pair of inner and outer surfaces facing the inner side is proximal A curved surface extending in an arc shape toward the part side and toward the inside is formed.

  According to the present invention, a curved surface extending in an arc shape toward the proximal portion side and toward the inside is formed on the inner side surface. Therefore, when the artificial hip joint component is inserted into the femur, It is possible to suppress the concentration of stress on the inner side of the position portion side. Thereby, it can suppress that the thin cortical bone which exists inside by the proximal part side in a femur fractures.

  A component for an artificial hip joint according to a sixth aspect of the present invention is the component for an artificial hip joint according to any one of the first to fifth aspects of the invention, wherein the proximal portion of the outer surface is disposed to face the outer side of the pair of inner and outer surfaces. The end is formed as an arcuate curved portion.

  According to the present invention, since the end portion on the proximal portion side of the outer side surface is formed as an arcuate curved surface portion, the artificial hip joint component when performing the insertion operation and the extraction operation of the artificial hip joint component with respect to the femur Can be prevented from interfering with the femur. Thereby, the insertion operation and removal operation | movement of the component for artificial hip joints with respect to a femur can be made easier, and work efficiency can be improved.

  The artificial hip joint component according to a seventh aspect of the present invention is the artificial hip joint component according to any one of the first to sixth aspects of the invention, wherein the pair of inner and outer surfaces are arranged so as to face the inner side and the outer side. A groove formed so as to extend along the axial direction is provided on at least one of the outer surfaces arranged in this manner.

  According to the present invention, since the groove extending along the axial direction is provided on at least one of the inner surface and the outer surface, the groove can easily mesh with the cortical bone, and the rotation resistance can be further improved. Further, since this groove is formed along the axial direction of the inner side surface or the outer side surface, interference with the femur in the insertion direction and the removal direction of the artificial hip joint component is suppressed, and the artificial hip joint component for the femur Can be easily inserted and removed.

  The component for an artificial hip joint according to an eighth aspect of the present invention is the component for an artificial hip joint according to any one of the first to seventh aspects of the invention. At least one of the outer surfaces arranged in such a manner is provided with a protrusion formed so as to extend in an edge shape along the axial direction at the edge portion on the front surface side and the rear surface side. Features.

  According to the present invention, since at least one of the inner side surface and the outer side surface is provided with the edge-like projections extending along the axial direction at the edge portions on the front side and the rear side, the projections mesh with the cortical bone. It becomes easy, and the rotation resistance can be further improved. In addition, since the protrusion is formed along the axial direction of the inner surface or the outer surface, interference with the femur in the insertion direction and the extraction direction of the component for the artificial hip joint is suppressed. Components can be easily inserted and removed.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to aim at the improvement of initial fixation, the component for artificial hip joints which can make easy the insertion operation | work to a femur and the extraction operation | work from a femur can be provided.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The present invention can be widely applied as a component for an artificial hip joint used as a stem member formed in a rod shape in which one end side is implanted in a femur in an artificial hip joint.

(First embodiment)
FIG. 1 is a cross-sectional view showing a component 1 for a hip prosthesis according to a first embodiment of the present invention, and shows a part of a cross section of a femur 100 and a pelvis 101. The artificial hip joint component 1 is configured as a stem member formed in a rod shape in which one end side is implanted in the medullary cavity portion 100 a of the femur 100. The component for artificial hip joint 1 is applied as an artificial hip joint in a state where it is combined with the head ball member 102. In artificial hip joint replacement, a hole whose shape is adjusted using only a surgical file or the like is formed in the medullary cavity portion 100a, and the artificial hip joint component 1 is inserted into the hole and buried. Planted. On the other hand, the femoral head ball member 102 is disposed on the acetabulum 101 a side of the pelvis 101 in the femur 100. Then, the head ball member 102 is disposed on the acetabulum 101a and slides on the spherical surface portion of the outer shape with respect to the acetabular cup 103 having a two-layer structure having the outer hemispherical shell member 103a and the inner hemispherical shell member 103b. Placed in.

  FIG. 2 is a perspective view of the artificial hip joint component 1. 3 is a left side view (FIG. 3A), a front view (FIG. 3B), and a cross-sectional view taken along line AA in FIG. 3B (FIG. 3C). )), A cross-sectional view taken along line BB in FIG. 3B (FIG. 3D), and a right side view (FIG. 3E). 2 and 3 will be described as being used in an artificial hip joint for a left hip joint.

  The artificial hip joint component 1 shown in FIGS. 2 and 3 is formed as a rod-shaped stem member as described above, and includes a neck portion 11, a pair of front and rear surfaces (12, 13), and a pair of inner and outer surfaces (14, 15). ) Is provided. As shown in FIGS. 3 (c) and 3 (d), the artificial hip joint component 1 has an axial center line C (FIG. 3 (a)) indicating an axial direction that is a bar-like extending direction in the artificial hip joint component 1. ) And FIG. 3 (e), the cross section perpendicular to FIG. 3 (e) is formed in a substantially rectangular shape. The artificial hip joint component 1 is made of a metal such as a titanium alloy, a cobalt chromium alloy, or stainless steel that has been approved as a medical device for living body implantation. The pair of front and rear surfaces (12, 13) and the pair of inner and outer surfaces (14, 15) in the artificial hip joint component 1 are subjected to an alkali heating treatment as a treatment for facilitating the formation of apatite on the surfaces thereof in vivo. And blasting.

  As shown in FIGS. 1 to 3, the neck portion 11 is provided so that one end side protrudes at the end portion on the other end side of the artificial hip joint component 1 implanted in the femur 100. When the artificial hip joint component 1 is used in an artificial hip joint, the head ball member 102 is fitted to the neck portion 11. The neck portion 11 is provided at an end portion on the other end side of the artificial hip joint component 1 such that the artificial hip joint component 1 is inclined and protrudes inward in a state where the artificial hip joint component 1 is implanted in the femur 100. ing.

  As shown in FIGS. 2 and 3, the pair of front and rear surfaces (12, 13) are the front side and the rear side of the human body when the artificial hip joint component 1 is implanted in the femur 100 (see FIG. 1). It is arranged to face. The pair of front and rear surfaces (12, 13) includes a tapered front surface 12 disposed on the front side of the human body and a tapered rear surface 13 disposed on the rear surface side of the human body. The tapered front surface 12 and the tapered rear surface 13 are respectively configured as surfaces configured by combining two flat tapered surfaces having different inclinations with respect to the axial center line C.

  The pair of front and rear surfaces (12, 13) includes a pair of proximal portion side front and rear surfaces (16, 17) and a pair of distal portion side front and rear surfaces (18, 19). The pair of proximal portion side front and back surfaces (16, 17) are disposed on the proximal portion side of the pair of front and back surfaces (12, 13) in a state of being implanted in the femur 100. The pair of proximal portion side front and rear surfaces (16, 17) are a proximal portion side tapered front surface 16 disposed on the front side of the human body and a proximal portion side tapered rear surface 17 disposed on the rear surface side of the human body. It consists of and. On the other hand, the pair of distal portion side front and rear surfaces (18, 19) are arranged on the distal portion side of the pair of front and rear surfaces (12, 13) in a state of being implanted in the femur 100. The pair of distal portion side front and rear surfaces (18, 19) are a distal portion side tapered front surface 18 disposed on the front side of the human body and a distal portion side tapered rear surface 19 disposed on the rear surface side of the human body. It consists of and. For the above arrangement, the tapered front surface 12 is composed of a proximal-side tapered front surface 16 and a distal-side tapered front surface 18, and the tapered rear surface 13 is connected to the proximal-side tapered rear surface 17. The distal portion side tapered rear surface 19 is formed.

  As shown well in FIG. 3, the proximal portion side tapered front surface 16 and the proximal portion side tapered rear surface 17 are arranged at positions symmetrical with respect to the axis center line C, and are arranged with respect to the axis center line C. Are each formed as a flat tapered surface inclined at the same angle. In FIG. 3 (e), the angle D of the inclination with respect to the axial center line C of the proximal-side tapered front surface 16 is shown, but the proximal-side tapered rear surface 17 also has the same angle with respect to the axial center line C ( (Angle D) It is formed to be inclined. And the magnitude | size of this angle D is set to 4 degrees, for example, and is set in the range of 2 degrees to 8 degrees. On the other hand, the distal-side tapered front surface 18 and the distal-side tapered rear surface 19 are arranged in line-symmetrical positions around the axial center line C, and are inclined at the same angle with respect to the axial center line C. Each is configured as a flat tapered surface. In FIG. 3 (e), an inclination angle E with respect to the axial center line C of the distal-side tapered front surface 18 is shown, but the distal-side tapered rear surface 19 also has the same angle with respect to the axial center line C ( Angle E) It is formed to be inclined. The size of the angle E is set to 2 °, for example, and is set in the range of 0 ° to 3 °.

  The setting range of angle D (2 ° to 8 °) and the setting range of angle E (0 ° to 3 °) are set in consideration of variations in the shape of the medullary cavity of the femur. is there. The shape of the medullary cavity varies from individual to individual, but generally the area on the proximal side tends to be large and the area on the distal side tends to be small, and the medullary cavity is assumed to be conical. Can be organized. And by setting in the setting range mentioned above, the component 1 for artificial hip joints can be implanted in the state adapted to the shape of the medullary cavity part.

  In addition, by setting the angle D and the angle E as described above, the pair of proximal portion side front and back surfaces (16, 17) and the pair of distal portion side front and back surfaces (18, 19) They are formed as surfaces having different inclinations with respect to the axial center line C (inclination with respect to the axial direction). Further, the angle D is set to be larger than the angle E. Thereby, the inclination with respect to the axial centerline C is set larger in the pair of proximal portion side front and rear surfaces (16, 17) than in the pair of distal portion side front and rear surfaces (18, 19).

  Moreover, as shown in FIG.2 and FIG.3, each surface (proximal part side taper front 16 and 17) of a pair of proximal part side front and back surfaces (16, 17) is provided on the pair of front and back faces (12, 13). A pair that defines a proximal-side tapered rear surface 17) and a pair of distal-side front and rear surfaces (18, 19) (distal-side tapered front surface 18, distal-side tapered rear surface 19). Boundary lines (20, 21) are formed. In addition, in FIG.3 (e), the position of a pair of boundary line (20, 21) is illustrated with the point. The pair of boundary lines (20, 21) is composed of a front side boundary line 20 and a rear side boundary line 21. The front-side boundary line 20 defines a proximal-side tapered front surface 16 and a distal-side tapered front surface 18, and the rear-side boundary line 21 is a proximal-side tapered rear surface 17 and a distal-side tapered surface. The rear surface 19 is partitioned. Each of the pair of boundary lines (20, 21) extends from the inner side to the outer side in the left-right direction of the human body and is inclined with respect to a direction perpendicular to the axial center line C (a direction perpendicular to the axial direction). It is formed so as to incline in a direction from the proximal portion side toward the distal portion side and extend linearly.

  As shown in FIGS. 2 and 3, the pair of inner and outer surfaces (14, 15) face the inner and outer sides in the left-right direction of the human body in a state where the artificial hip joint component 1 is implanted in the femur 100. Be placed. The pair of inner and outer surfaces (14, 15) are composed of an inner surface 14 and an outer surface 15, and the inner surface 14 is disposed so as to face inward in the left-right direction of the human body. It is arranged to face. The inner side surface 14 is formed with a curved surface 22 that extends in an arc shape toward the proximal portion side and toward the inner side in the left-right direction of the human body. The curved surface 22 is also formed in an arc shape in a direction perpendicular to the axial center line C. On the other hand, the outer surface 15 is formed as a curved surface portion 23 whose end on the proximal side is curved in an arc shape.

  Here, the relationship between the pair of front and rear surfaces (12, 13) and the pair of boundary lines (20, 21) will be described in more detail. FIG. 4 shows a virtual component schematically showing a portion excluding both end portions in the axial direction of the component 1 for an artificial hip joint, and is a perspective view (FIG. 4A) and a perspective view (FIG. 4). 4 (b)). 5 is a plan view (FIG. 5A), a left side view (FIG. 5B), a front view (FIG. 5C), and a right side view of the virtual component shown in FIG. The figure (FIG.5 (d)) and the bottom view (FIG.5 (e)) are shown. Elements corresponding to the artificial hip joint component 1 are denoted by the same reference numerals.

  As shown in FIGS. 4 and 5, the pair of boundary lines (20, 21) are arranged in parallel to each other, and are proximal to the cross section perpendicular to the axial center line C from the inside to the outside of the human body. It extends so that it may incline to the distal part side. Then, with this pair of boundary lines (20, 21) as a boundary, a pair of proximal portion side front and rear surfaces (16, 17) inclined so as to widen toward the proximal portion side with respect to the axial center line C, A pair of distal portion side front and rear surfaces (18, 19) that are inclined so as to expand toward the proximal portion side with respect to the axial center line C are disposed. For this reason, the cross-sectional shape perpendicular to the axial center line C has a wide width in the region surrounded by the pair of proximal side front and rear surfaces (16, 17) and the pair of inner and outer surfaces (14, 15). A trapezoidal shape is formed, and a narrow trapezoidal shape is formed in a region surrounded by the pair of distal portion side front and rear surfaces (18, 19) and the pair of inner and outer surfaces (14, 15). And all cross-sectional shapes become trapezoid shape which spreads toward the outer side in the human body left-right direction.

  In addition, about the relationship between a pair of front and rear surfaces (12, 13) and a pair of boundary lines (20, 21), the artificial hip joint component 1 is changed in a configuration different from the configuration described in FIGS. It can also be implemented. FIG. 6 shows a hypothetical component schematically showing a portion excluding both end portions in the axial direction in a modified example of the component 1 for the artificial hip joint, and a perspective view thereof (FIG. 6A). And a perspective view (FIG. 6B). 7 is a plan view (FIG. 7A), a left side view (FIG. 7B), a front view (FIG. 7C), and a right side view of the virtual component shown in FIG. The figure (Drawing 7 (d)) and the bottom view (Drawing 7 (e)) are shown. In addition, in the modification shown in FIG.6 and FIG.7, the same code | symbol is attached | subjected to the element corresponding to the component 1 for artificial hip joints.

  6 and 7, the pair of boundary lines (20, 21) extend while the distance between the pair of boundary lines (20, 21) increases from the inner side to the outer side in the horizontal direction of the human body. At the same time, it extends so as to be inclined from the proximal portion side to the distal portion side with respect to the direction perpendicular to the axial center line C. And a pair of proximal portion side front and back surfaces (16, 17) that incline so as to widen toward the proximal portion side with respect to the axial center line C with the pair of boundary lines (20, 21) as a boundary, A pair of distal portion side front and rear surfaces (18, 19) that are inclined so as to expand toward the proximal portion side with respect to the axial center line C are disposed. Also in this modification, the cross-sectional shape perpendicular to the axial center line C is a region where the periphery is surrounded by the pair of proximal portion side front and rear surfaces (16, 17) and the pair of inner and outer surfaces (14, 15). A trapezoid with a wide width is formed, and a trapezoid with a small width is formed in a region surrounded by the pair of distal-side front and rear surfaces (18, 19) and the pair of inner and outer surfaces (14, 15). And all cross-sectional shapes become trapezoid shape which spreads toward the outer side in the human body left-right direction.

  According to the artificial hip joint component 1 described above, the pair of front and rear surfaces (12, 13) and the pair of inner and outer surfaces (14, 15) are formed, so that the cross section of the artificial hip joint component 1 is formed in a substantially rectangular shape. Is done. The pair of front and rear surfaces (12, 13) includes a pair of proximal portion side front and rear surfaces (16, 17) and a pair of distal portion side front and rear surfaces (18, 19), which are inclined with respect to the axial direction. Are formed as different surfaces. For this reason, compared to the case where the pair of front and rear surfaces (12, 13) are formed as uniformly inclined surfaces, it is less likely to sink along the hole formed in the medullary cavity 100a, and the position in the axial direction is reduced. The sinking resistance which is stability can be greatly improved. In addition, the pair of proximal portion side front and rear surfaces (16, 17) and the pair of distal portion side front and rear surfaces (18, 19) have different inclinations in the axial direction, and each of these surfaces (16, 17, The pair of boundary lines (20, 21) that divide 18 and 19) are formed to extend in a direction inclined with respect to a direction perpendicular to the axial direction. For this reason, in addition to a significant improvement in sinking resistance due to the resistance of the surfaces that have different inclinations and cross at an angle, sufficient resistance to rotation, which is the stability of the position in the rotational direction around the axial direction, is ensured. Can do. Thereby, it is possible to improve the sinking resistance and the rotation resistance, which are indexes of initial fixability, and it is possible to improve the initial fixability.

  And as above-mentioned, the component 1 for artificial hip joints is comprised so that initial fixation may improve by a pair of front-and-back surfaces (12, 13) comprised including the surface which cross | intersects diagonally different in inclination. Yes. For this reason, a shape configuration that makes it difficult to insert the artificial hip joint component 1 into the hole formed in the medullary cavity portion 100a of the femur 100 (such as a pair of front and back concavo-convex shapes and a lateral surface as in the prior art). No shape configuration such as a large overhanging portion is provided. Thereby, the insertion operation | work to the femur 100 of the component 1 for artificial hip joints can be performed easily. Further, when forming a hole in the medullary cavity 100a, it is only necessary to form a hole having a shape corresponding to a pair of front and rear surfaces (12, 13) having different inclinations and crossing obliquely, and the hole forming operation is facilitated. In addition, the possibility that the femur 100 is broken during the operation can be suppressed. The pair of front and rear surfaces (12, 13) that improve the initial fixability has a shape configuration (that is, in the prior art that makes the work of removing the artificial hip joint component 1 from the femur 100 a labor-intensive work). Such a pair of front and rear surface uneven shapes and a large projecting portion of the outer surface are not provided. For this reason, the extraction operation | work from the femur 100 of the component 1 for artificial hip joints can be performed easily.

  Therefore, according to the present embodiment, it is possible to provide the artificial hip joint component 1 that can improve the initial fixability and can easily perform the insertion operation into the femur and the extraction operation from the femur. it can.

  Moreover, according to the component 1 for artificial hip joints, the pair of proximal portion side front and rear surfaces (16, 17) are formed so that the inclination with respect to the axial direction is larger than the pair of distal portion side front surfaces (18, 19). Therefore, it is possible to configure the artificial hip joint component 1 having a shape in which the cross-sectional area is larger on the proximal side than on the distal side. On the other hand, the medullary cavity of the femur generally has a form in which the area expands from the distal part side to the proximal part side, so that the cross section of the proximal part side is larger than the distal part side. By using the artificial hip joint component 1, it becomes easy to realize an artificial hip joint component having a shape more suitable for the form of the medullary cavity, and the initial fixation can be further improved.

  Further, according to the artificial hip joint component 1, the pair of boundary lines (20, 21) is formed to extend from the inside toward the outside so as to be inclined from the proximal portion side to the distal portion side. It is possible to configure the artificial hip joint component 1 having a shape in which the area of the front and rear surfaces (16, 17) on the proximal portion side is enlarged. On the other hand, since the medullary cavity of the femur generally has a form in which the area expands outward on the proximal portion side, an artificial region in which the area of the pair of proximal portion side front and rear surfaces (16, 17) increases on the outer side. By using the hip joint component 1, it becomes easier to realize an artificial hip joint component having a shape more suitable for the form of the medullary cavity, and the initial fixation can be further improved.

  Moreover, according to the modification of the component 1 for artificial hip joints described in FIGS. 6 and 7, the distance between the pair of boundary lines (20, 21) from the inside toward the outside is the distance between the pair of boundary lines (20, 21). Therefore, it is possible to configure a component for a hip prosthesis having a shape in which the cross-sectional area is larger than that on the inner side. On the other hand, since the medullary cavity of the femur generally has a form in which the area expands from the inside to the outside, the medullary cavity part can be obtained by using a component for a hip prosthesis having a cross section that is larger than the inside. This makes it easier to realize a component for an artificial hip joint that has a shape that is more suitable for the above-described configuration, and can further improve the initial fixability.

  Further, according to the artificial hip joint component 1, the curved surface 22 extending in an arc shape toward the proximal side and inward is formed on the inner side surface 14, so that the artificial hip joint component 1 is formed on the femur 100. When it is inserted, the stress can be prevented from concentrating inside the proximal portion of the femur 100. Thereby, it can suppress that the thin cortical bone which exists inside by the proximal part side in the femur 100 will break.

  Further, according to the artificial hip joint component 1, the proximal end portion of the outer side surface 15 is formed as an arcuate curved surface portion 23, so that the artificial hip joint component 1 is inserted into and removed from the femur 100. When performing, it can suppress that the component 1 for artificial hip joints and the femur 100 interfere. Thereby, the insertion operation and removal operation | movement of the component 1 for artificial hip joints with respect to the femur 100 can be made easier, and work efficiency can be improved.

  In addition, the inventor of the present application fixed the artificial hip joint component in the formwork with hard foaming urethane and pushed the artificial hip joint component into the formwork. A rotation resistance confirmation test for rotating the component was performed. These tests were performed on the artificial hip joint component 1 and, for comparison, an artificial hip joint component having a concavo-convex shape formed on a pair of front and rear surfaces (Comparative Example 1) and an outer surface. This was also performed on a component for artificial hip joints (Comparative Example 2) in which a large overhang portion was formed. As a result, regarding the sinking resistance, it was confirmed that the component 1 for hip prosthesis was improved as compared with Comparative Example 1 and Comparative Example 2. Moreover, about rotation resistance, it has confirmed that it was a substantially equivalent level in the component 1 for artificial hip joints, and the comparative example 1 and the comparative example 2. FIG. Therefore, it can be confirmed that by using the artificial hip joint component 1, it is possible to improve the initial fixability with a configuration that can facilitate the work of inserting into and removing from the femur. did it.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 8 is a perspective view showing a component 2 for hip prosthesis according to the second embodiment of the present invention. 9 is a left side view (FIG. 9A), a front view (FIG. 9B), and a cross-sectional view taken along line AA in FIG. 9B of the component 2 for a hip prosthesis (FIG. 9). (C)), the BB arrow directional cross-sectional view (FIG. 9 (d)) of FIG.9 (b), and the right view (FIG.9 (e)) are shown. The artificial hip joint component 2 shown in FIGS. 8 and 9 will be described as being used in an artificial hip joint for the left hip joint.

  The artificial hip joint component 2 shown in FIGS. 8 and 9 is used in the same manner as the artificial hip joint component 1 of the first embodiment, and is applied to an artificial hip joint by artificial hip joint replacement. This hip prosthesis component 2 is configured in the same manner as the hip prosthesis component 1 of the first embodiment, and includes a neck portion 11, a pair of front and rear surfaces (12, 13), and a pair of inner and outer surfaces (14, 15). Is provided. However, the artificial hip joint component 2 is different from the artificial hip joint component 1 of the first embodiment in that grooves (24, 25) are provided on the pair of inner and outer surfaces (14, 15). In the following, the same components as those in the first embodiment are denoted by the same reference numerals in the drawings, the description thereof is omitted, and components different from those in the first embodiment will be described.

  As shown in FIGS. 8 and 9, the pair of inner and outer surfaces (14, 15) of the artificial hip joint component 2 are embedded in the femur in the left-right direction of the human body, as in the first embodiment. The inner side surface 14 is formed with a curved surface 22, and the outer surface 15 is formed with a curved surface portion 23 at an end portion on the proximal side. However, the pair of inner and outer surfaces (14, 15) of the artificial hip joint component 2 are provided with grooves (24, 25), respectively. An inner groove 24 is provided on the inner side surface 14, and an outer groove 25 is provided on the outer side surface 15. Each of the inner groove 24 and the outer groove 25 is formed as a groove having a cross-sectional shape recessed in an arc shape in a cross section perpendicular to the axial center line C. Further, the inner groove 24 is disposed from the center portion in the axial direction on the inner side surface 14 to the end portion on the distal portion side, and is formed to extend along the axial direction. On the other hand, the outer groove 25 is disposed over substantially the entire length in the axial direction from the proximal end to the distal end of the outer surface 15 and is formed to extend in the axial direction.

  According to the artificial hip joint component 2 described above, as with the artificial hip joint component 1 of the first embodiment, it is possible to improve the initial fixability, and to insert into the femur and to remove from the femur. Can be made easy. And according to this component 2 for artificial hip joints, since the groove | channel (24, 25) extended along an axial direction is provided in the inner surface 14 and the outer surface 15, it meshes with a cortical bone by this groove | channel (24, 25). This makes it easier to improve the resistance to rotation. Further, since these grooves (24, 25) are formed along the axial direction of the inner side surface 14 and the outer side surface 15, interference with the femur in the insertion direction and the extraction direction of the artificial hip joint component 2 is also suppressed. In addition, the insertion operation and the extraction operation of the artificial hip joint component 2 with respect to the femur can be easily performed.

(Third embodiment)
Next, a third embodiment of the present invention will be described. FIG. 10 is a perspective view showing a component 3 for an artificial hip joint according to the third embodiment of the present invention. 11 is a left side view (FIG. 11A), a front view (FIG. 11B), and a cross-sectional view taken along line AA in FIG. 11B of the component 3 for artificial hip joint (FIG. 11). (C)), the BB line arrow sectional view (Drawing 11 (d)) of Drawing 11 (b), and the right view (Drawing 11 (e)) are shown. The artificial hip joint component 3 shown in FIGS. 10 and 11 will be described as being used in an artificial hip joint for the left hip joint.

  The artificial hip joint component 3 shown in FIGS. 10 and 11 is used in the same manner as the artificial hip joint component 1 of the first embodiment, and is applied to an artificial hip joint by artificial hip joint replacement. The component for artificial hip joint 3 is configured in the same manner as the component for artificial hip joint 1 of the first embodiment, and includes a neck portion 11, a pair of front and rear surfaces (12, 13), and a pair of inner and outer surfaces (14, 15). Is provided. However, the artificial hip joint component 3 is different from the artificial hip joint component 1 of the first embodiment in that the protrusions (26, 27) are provided on the pair of inner and outer surfaces (14, 15). In the following, the same components as those in the first embodiment are denoted by the same reference numerals in the drawings, the description thereof is omitted, and components different from those in the first embodiment will be described.

  As shown in FIGS. 10 and 11, the pair of inner and outer surfaces (14, 15) of the artificial hip joint component 3 is the inner side in the left-right direction of the human body in the state of being implanted in the femur as in the first embodiment. The inner side surface 14 is formed with a curved surface 22, and the outer surface 15 is formed with a curved surface portion 23 at an end portion on the proximal side. However, the pair of inner and outer surfaces (14, 15) of the artificial hip joint component 3 are provided with protrusions (26, 27) each formed in a fin shape. An inner protrusion 26 is provided on the inner side surface 14, and an outer protrusion 27 is provided on the outer surface 15. The inner protrusions 26 are provided at the edge portions on the front side and the rear side of the human body, respectively, and are formed to extend in an edge shape along the axial direction. The inner protrusion 26 is disposed from the center in the axial direction on the inner side surface 14 to the end on the distal side. On the other hand, the outer protrusions 27 are also provided at the edge portions on the front side and the rear side of the human body, respectively, and are formed to extend in an edge shape along the axial direction. The outer protrusion 27 is disposed from the center in the axial direction on the outer surface 15 to the end on the distal side.

  According to the artificial hip joint component 3 described above, as with the artificial hip joint component 1 of the first embodiment, it is possible to improve the initial fixability, and to insert into the femur and to remove from the femur. Can be made easier. According to the artificial hip joint component 3, the inner side surface 14 and the outer side surface 15 are provided with edge-shaped protrusions (26, 27) extending along the axial direction at the edge portions on the front surface side and the rear surface side. The protrusions (26, 27) can easily engage with the cortical bone, and the rotation resistance can be further improved. Moreover, since these protrusions (26, 27) are formed along the axial direction of the inner side surface 14 and the outer side surface 15, they may interfere with the femur in the insertion direction and the extraction direction of the artificial hip joint component 3. It is restrained and the insertion operation and removal operation | movement of the component 3 for artificial hip joints with respect to a femur can also be performed easily.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. FIG. 12 is a perspective view showing the artificial hip joint component 4 according to the fourth embodiment of the present invention. 13 is a left side view (FIG. 13 (a)), a front view (FIG. 13 (b)), and a cross-sectional view taken along line AA in FIG. 13 (b) of the artificial hip joint component 4 (FIG. 13). (C)), the BB arrow directional cross-sectional view (FIG.13 (d)) of FIG.13 (b), and the right view (FIG.13 (e)) are shown. The artificial hip joint component 4 shown in FIGS. 12 and 13 will be described as being used in an artificial hip joint for the left hip joint.

  The artificial hip joint component 4 shown in FIGS. 12 and 13 is used in the same manner as the artificial hip joint component 1 of the first embodiment, and is applied to an artificial hip joint by artificial hip joint replacement. The hip prosthesis component 4 is configured in the same manner as the hip prosthesis component 1 of the first embodiment, and includes a neck portion 11, a pair of front and rear surfaces (12, 13), and a pair of inner and outer surfaces (14, 15). Is provided. However, the artificial hip joint component 4 is different from the artificial hip joint component 1 of the first embodiment in the configuration of the pair of boundary lines (28, 29) provided on the pair of front and rear surfaces (12, 13). In the following, the same components as those in the first embodiment are denoted by the same reference numerals in the drawings, the description thereof is omitted, and components different from those in the first embodiment will be described.

  As shown in FIGS. 12 and 13, the pair of anterior and posterior surfaces (12, 13) of the artificial hip joint component 4 are embedded in the femur in the state of being implanted in the femur as in the first embodiment. It is arranged so as to face the side, and is composed of a tapered front surface 12 on the front surface side and a tapered rear surface 13 on the rear surface side. The tapered front surface 12 and the tapered rear surface 13 are respectively configured as surfaces configured by combining two tapered surfaces having different inclinations with respect to the axial center line C.

  The pair of front and rear surfaces (12, 13) in the artificial hip joint component 4 are similar to the first embodiment in that the pair of proximal portion side front and back surfaces (16, 17) and the pair of distal portion side front and back surfaces ( 18, 19). The tapered front surface 12 includes a proximal-side tapered front surface 16 and a distal-side tapered front surface 18, and the tapered rear surface 13 includes a proximal-side tapered rear surface 17 and a distal-side tapered rear surface. 19.

  Moreover, as shown in FIG.12 and FIG.13, each surface (proximal part) of a pair of proximal part side front and back surfaces (16, 17) is provided on the pair of front and back faces (12, 13) in the component for artificial hip joint 4 Side tapered front surface 16, proximal portion side tapered rear surface 17) and a pair of distal portion side front and rear surfaces (18, 19) (distal portion side tapered front surface 18, distal portion side tapered rear surface 19) A pair of boundary lines (28, 29) are formed. In FIG. 13 (e), the positions of the pair of boundary lines (28, 29) are indicated by dots. The pair of boundary lines (28, 29) is composed of a front side boundary line 28 and a rear side boundary line 29. The front boundary line 28 defines the proximal taper front surface 16 and the distal taper front surface 18, and the rear boundary line 29 includes the proximal taper rear surface 17 and the distal taper. The rear surface 19 is partitioned.

  Each of the pair of boundary lines (28, 29) has a vertical portion extending in a direction perpendicular to the axial center line C, and a direction extending from the inner side to the outer side in the left-right direction of the human body and perpendicular to the axial center line C. And an inclined portion extending linearly in a direction inclined with respect to the angle. In FIG. 13, the vertical portion 28 a and the inclined portion 28 b described above are illustrated only for the front boundary line 28 (see FIG. 13B). The inclined portions of the pair of boundary lines (28, 29) are directions inclined with respect to a direction perpendicular to the axial center line C (direction perpendicular to the axial direction) and from the proximal side toward the distal side. It is formed so as to be inclined and extended. In addition, since the pair of boundary lines (28, 29) are formed so as to incline from the middle in this way, each surface of the pair of proximal portion side front and rear surfaces (16, 17) and the pair of distal portion sides. Each of the front and rear surfaces (18, 19) is formed with a curved portion that is slightly curved in a direction perpendicular to the axial center line C.

  According to the artificial hip joint component 4 described above, the pair of boundary lines (28, 29) including the portions extending in the direction inclined with respect to the direction perpendicular to the axial direction on the pair of front and rear surfaces (12, 13). Is provided. For this reason, as with the artificial hip joint component 1 of the first embodiment, it is possible to improve the initial fixability and to facilitate the insertion operation into the femur and the extraction operation from the femur.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described. FIG. 14 is a perspective view showing the artificial hip joint component 5 according to the fifth embodiment of the present invention. 15 is a left side view of the artificial hip joint component 5 (FIG. 15A), a front view (FIG. 15B), and a cross-sectional view taken along line AA in FIG. 15B (FIG. 15). (C)), the BB arrow directional cross-sectional view (FIG.15 (d)) of FIG.15 (b), and the right view (FIG.15 (e)) are shown. The artificial hip joint component 5 shown in FIGS. 14 and 15 is described as being used in an artificial hip joint for the left hip joint.

  The artificial hip joint component 5 shown in FIGS. 14 and 15 is used in the same manner as the artificial hip joint component 1 of the first embodiment, and is applied to an artificial hip joint by artificial hip joint replacement. The component 5 for a hip prosthesis is configured in the same manner as the component 1 for a hip prosthesis according to the first embodiment, and includes a neck portion 11, a pair of front and rear surfaces (12, 13), and a pair of inner and outer surfaces (14, 15). Is provided. However, the artificial hip joint component 5 is different from the artificial hip joint component 1 of the first embodiment in the configuration of the pair of boundary lines (30, 31) provided on the pair of front and rear surfaces (12, 13). In the following, the same components as those in the first embodiment are denoted by the same reference numerals in the drawings, the description thereof is omitted, and components different from those in the first embodiment will be described.

  As shown in FIGS. 14 and 15, the pair of front and rear surfaces (12, 13) of the artificial hip joint component 5 are embedded in the femur in the state of being implanted in the femur as in the first embodiment. It is arranged so as to face the side, and is composed of a tapered front surface 12 on the front surface side and a tapered rear surface 13 on the rear surface side. The tapered front surface 12 and the tapered rear surface 13 are respectively configured as surfaces configured by combining two tapered surfaces having different inclinations with respect to the axial center line C.

  The pair of front and rear surfaces (12, 13) in the artificial hip joint component 5 are similar to the first embodiment in that the pair of proximal portion front and rear surfaces (16, 17) and the pair of distal portion front and rear surfaces ( 18, 19). The tapered front surface 12 includes a proximal-side tapered front surface 16 and a distal-side tapered front surface 18, and the tapered rear surface 13 includes a proximal-side tapered rear surface 17 and a distal-side tapered rear surface. 19.

  As shown in FIGS. 14 and 15, the pair of front and rear surfaces (12, 13) of the artificial hip joint component 5 includes a pair of proximal portion side front and rear surfaces (16, 17). Side tapered front surface 16, proximal portion side tapered rear surface 17) and a pair of distal portion side front and rear surfaces (18, 19) (distal portion side tapered front surface 18, distal portion side tapered rear surface 19) A pair of boundary lines (30, 31) are formed. In addition, in FIG.15 (e), the position of a pair of boundary line (30, 31) is illustrated with the point. The pair of boundary lines (30, 31) includes a front-side boundary line 30 and a rear-side boundary line 31. The front-side boundary line 30 defines the proximal-side tapered front surface 16 and the distal-side tapered front surface 18, and the rear-side boundary line 31 is the proximal-side tapered rear surface 17 and the distal-side tapered surface. The rear surface 19 is partitioned.

  Each of the pair of boundary lines (30, 31) extends from the inner side to the outer side in the horizontal direction of the human body and is inclined with respect to the direction perpendicular to the axis center line C and far from the proximal side. It is formed so as to extend while curving in a curved direction in the direction toward the distal portion side. In addition, since the pair of boundary lines (30, 31) are formed so as to extend while being curved in this way, each surface of the pair of proximal portion side front and rear surfaces (16, 17) and the pair of distal portions. On each of the side front and rear surfaces (18, 19), a curved portion that is slightly curved in the direction perpendicular to the axial center line C is formed.

  According to the artificial hip joint component 5 described above, the pair of front and rear surfaces (12, 13) includes a pair of boundary lines (30, 31) including a portion extending in a direction inclined with respect to a direction perpendicular to the axial direction. Is provided. For this reason, as with the artificial hip joint component 1 of the first embodiment, it is possible to improve the initial fixability and to facilitate the insertion operation into the femur and the extraction operation from the femur.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims. For example, the angle of the inclination of the pair of proximal portion side front and back surfaces and the pair of distal portion side front and back surfaces with respect to the axial direction can be changed as appropriate. In addition, the form and angle of the inclination of the pair of boundary lines with respect to the axial direction, and the position in the axial direction can be changed as appropriate. Further, in the second embodiment and the third embodiment, the configuration of the grooves and the protrusions provided along the axial direction on the pair of inner and outer surfaces is exemplified, but this need not be the case, and the position and length in the axial direction may be omitted. The cross-sectional shape in the direction perpendicular to the axial direction can be variously changed. Moreover, about this groove | channel and protrusion part, you may be provided only in either the inner surface or the outer surface.

  INDUSTRIAL APPLICABILITY The present invention can be widely applied as a component for an artificial hip joint used as a stem member formed in a rod shape in which one end side is implanted in a femur in an artificial hip joint.

It is sectional drawing which shows the component for artificial hip joints concerning 1st Embodiment of this invention, Comprising: It is the figure shown with a part of cross section of a femur and a pelvis. It is a perspective view of the component for artificial hip joints shown in FIG. FIG. 3 is a left side view, a front view, a cross-sectional view, and a right side view of the artificial hip joint component shown in FIG. 2. FIG. 3 is a perspective view and a perspective view showing a virtual component schematically showing a portion excluding both end portions in the axial direction of the component for an artificial hip joint shown in FIG. 2. FIG. 5 is a plan view, a left side view, a front view, a right side view, and a bottom view of the virtual component shown in FIG. 4. It is the perspective view and perspective view which show the virtual component which showed typically the part except the both ends in the axial direction about the modification of the component for artificial hip joints shown in FIG. FIG. 7 is a plan view, a left side view, a front view, a right side view, and a bottom view of the virtual component shown in FIG. 6. It is a perspective view of the component for artificial hip joints which concerns on 2nd Embodiment of this invention. FIG. 9 is a left side view, a front view, a cross-sectional view, and a right side view of the artificial hip joint component shown in FIG. 8. It is a perspective view of the component for artificial hip joints which concerns on 3rd Embodiment of this invention. FIG. 11 is a left side view, a front view, a cross-sectional view, and a right side view of the artificial hip joint component shown in FIG. 10. It is a perspective view of the component for artificial hip joints which concerns on 4th Embodiment of this invention. FIG. 13 is a left side view, a front view, a cross-sectional view, and a right side view of the artificial hip joint component shown in FIG. 12. It is a perspective view of the component for artificial hip joints which concerns on 5th Embodiment of this invention. FIG. 15 is a left side view, a front view, a sectional view, and a right side view of the artificial hip joint component shown in FIG. 14.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Component 12 for artificial hip joints, 13 A pair of front and back surfaces 14, 15 A pair of inner and outer surfaces 16, 17 A pair of proximal part side front and back surfaces 18, 19 A pair of distal part side front and back surfaces 20, 21 A pair of boundary line

Claims (8)

In a hip prosthesis, a prosthetic hip joint component used as a stem member formed in the shape of a rod whose one end is implanted in the femur,
A pair of front and rear surfaces arranged to face the front side and the back side of the human body when implanted in the femur, and to the inside and outside in the left and right direction of the human body when implanted in the femur A pair of arranged inner and outer surfaces are formed,
The pair of front and rear surfaces are a pair of proximal portion front and rear surfaces disposed on the proximal portion side in a state of being implanted in the femur, and a pair of distal portion front and rear surfaces disposed on the distal portion side. The pair of proximal portion side front and back surfaces and the pair of distal portion side front and back surfaces are formed as surfaces having different inclinations with respect to an axial direction that is a direction extending in a rod shape in the stem member,
The pair of boundary lines that define the surfaces of the pair of proximal portion side front and back surfaces and the surfaces of the pair of distal portion side front and back surfaces extend from the inside toward the outside, and the axial direction A component for an artificial hip joint comprising a portion extending in a direction inclined with respect to a direction perpendicular to the vertical direction. The component for an artificial hip joint according to claim 1,
The artificial hip joint component, wherein the pair of proximal portion side front and back surfaces has a larger inclination with respect to the axial direction than the pair of distal portion side front and back surfaces. A component for an artificial hip joint according to claim 1 or 2,
The pair of boundary lines includes a portion extending from the inner side toward the outer side and extending in a direction from the proximal portion side toward the distal portion side with respect to a direction perpendicular to the axial direction. A component for artificial hip joints. The component for an artificial hip joint according to any one of claims 1 to 3,
The pair of boundary lines includes a portion extending in a direction inclined with respect to a direction perpendicular to the axial direction while extending while the distance between the pair of boundary lines increases from the inner side toward the outer side. A component for artificial hip joints. The component for an artificial hip joint according to any one of claims 1 to 4,
An artificial surface characterized in that a curved surface extending in a circular arc shape toward the proximal portion side and toward the inner side is formed on the inner side surface of the pair of inner and outer surfaces arranged to face the inner side. Hip joint component. A component for an artificial hip joint according to any one of claims 1 to 5,
An end portion on the proximal portion side of the outer surface disposed so as to face the outer side of the pair of inner and outer surfaces is formed as an arcuate curved surface portion. The artificial hip joint component according to any one of claims 1 to 6,
A groove formed so as to extend along the axial direction in at least one of an inner surface arranged to face the inner side and an outer surface arranged to face the outer side of the pair of inner and outer surfaces. A component for an artificial hip joint, characterized in that is provided. A component for an artificial hip joint according to any one of claims 1 to 7,
At least one of the inner side surface arranged to face the inner side and the outer side surface arranged to face the outer side of the pair of inner and outer side surfaces has an axis at the edge portion on the front side and the rear side. A component for an artificial hip joint, characterized in that a protrusion is formed so as to extend in an edge shape along the direction.

Images