JP2009061069A - Device for testing cup member for artificial hip joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for testing a cup member for an artificial hip joint, capable of allowing a stress distribution in the cup member to be close to uniformity, and considerably suppressing complexity in a device configuration. <P>SOLUTION: An external surface side support tool 12 supports the cup member 100 in the side part from an external surface side. A contact pressure generating mechanism 13 generates contact pressure with respect to the internal surface 100a of the cup member 100 by allowing a contact pressure generating medium for generating the contact pressure by contact to be brought into contact with a center circumferential area 100c surrounding the circumference of a center area 100b including the center part of the internal surface 100a, and also keeps the contact surface generating medium in a non-contact state with respect to the center area 100b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an artificial hip joint cup member testing apparatus for detecting a defective cup member by applying a surface pressure to an inner surface of a cup member used in an artificial hip joint.

  Conventionally, as a hip prosthesis, a cup member that is embedded in the body and disposed on the pelvis side, and a bone head ball that is disposed on the femur side with respect to the cup member and is further movably fitted to the cup member What is provided is used. In such an artificial hip joint, the cup member comes into contact with a ceramic head ball on the inner surface thereof. For this reason, as a test for detecting a defective cup member, it is conceivable to apply a load to the inner surface of the cup member using a ceramic head ball. However, if a test is performed in which the bone head ball is brought into direct contact with the inner surface of the cup member and a load is applied, wrinkles are likely to occur on the inner surface of the cup member. There is a risk of being easily invited. Therefore, as disclosed in Patent Document 1, an artificial hip joint for detecting a defective cup member by applying a surface pressure to the inner surface of the cup member used in the hip prosthesis by means other than a head ball. 2. Description of the Related Art An apparatus for testing a cup member is known.

  In Patent Document 1, as a test apparatus for a cup member for an artificial hip joint, there are a test apparatus that applies a surface pressure to the inner surface of the cup member using a punch, and a test apparatus that applies a surface pressure using a pressure liquid. It is disclosed. The test apparatus for applying a surface pressure using a punch in Patent Document 1 is a cup member via an indenter that is a surface pressure generating medium having a shape of a part of a spherical body called a spherical body provided on the tip end side of the punch. A surface pressure is applied to the inner surface of the plate. This spherical body (indenter) is made of polytetrafluoroethylene, and prevents wrinkles from occurring on the inner surface of the cup member. And in such a test apparatus, while applying the surface pressure to the inner surface of the cup member from the punch through the above-mentioned spherical notch in a state where the cup member is supported by the holding device in the edge region of the maximum outer periphery, The cup member is also configured to load a supporting force in the direction opposite to the load by the punch along the direction of the center line of the ball member from the side opposite to the ball member. The supporting force in the opposite direction is applied by using a punch different from the punch that applies a load to the spherical missing piece. Thus, the purpose of this test apparatus is to make the stress distribution in the cup member more uniform by separately applying a supporting force (load) in the opposite direction.

  In addition, the test apparatus for applying a surface pressure using a pressure liquid in Patent Document 1 is provided with a metal block that forms a space filled with a pressure liquid that is a surface pressure generating medium between the inner surface of the cup member. Yes. This space is sealed by an annular sealing element. The metal block is formed with a hole as a supply line for the pressure liquid, and the pressure liquid is supplied to the space through the hole so that a surface pressure is applied to the inner surface of the cup member. It has become. Thus, in this test apparatus, wrinkles are prevented from occurring on the inner surface of the cup member by using the pressure liquid as the surface pressure generating medium. Then, in this test apparatus, the cup member is supported by the pressure liquid in a state in which the cup member is supported by the holding device at the edge region of the maximum outer periphery, similarly to the test apparatus that applies the surface pressure using the punch described above. A surface pressure is applied to the inner surface of the cup member, and a supporting force in a direction opposite to the urging direction by the pressure liquid is also loaded from the side opposite to the side on which the pressure liquid acts on the cup member. The purpose of this test apparatus is to make the stress distribution in the cup member closer to uniform by separately applying a supporting force (load) in the opposite direction.

JP-T-2002-525569 (page 6-10, Fig. 1-2)

  In the test apparatus for a hip joint cup member disclosed in Patent Document 1, both the test apparatus for applying a surface pressure using a punch and the test apparatus for applying a surface pressure using a pressure liquid The purpose is to make the stressed part more uniform. However, for this purpose, as described above, in any test apparatus, it is necessary to apply a surface pressure on the inner surface of the cup member from above and to apply a load opposite to the load direction from below. It becomes. For this reason, a mechanism for applying a surface pressure from above and another mechanism for applying a load in the direction opposite to the loading direction by this mechanism are required. For this reason, a plurality of mechanisms for applying a surface pressure and a load to the cup member are required, and the configuration of the apparatus becomes complicated.

  The present invention relates to a test apparatus for a hip joint cup member for detecting a defective cup member by applying a surface pressure to the inner surface of a cup member used in an artificial hip joint in view of the above situation. It is an object of the present invention to provide a testing device for a cup member for an artificial hip joint that can make the stress distribution in the cup member more uniform and can greatly suppress the complexity of the device configuration.

Means and effects for solving the problems

  In order to achieve the above object, a test apparatus for a cup member for an artificial hip joint according to the first aspect of the present invention is to detect a defective cup member by applying a surface pressure to the inner surface of a cup member used in an artificial hip joint. An apparatus for testing an artificial hip joint cup member, wherein the cup member is supported on the side thereof from the outer surface side by an outer surface side support, and the surface that contacts the inner surface of the cup member to generate surface pressure. A surface pressure is generated by bringing a pressure generating medium into contact with a central peripheral region surrounding the periphery of a central region including a central portion on the inner surface, and the surface pressure is maintained in a non-contact state with respect to the central region. And a generating mechanism.

According to the present invention, the cup member is supported by the surface pressure generating mechanism on the inner surface thereof while being supported from the outer surface side of the cup member. Then, the surface pressure generating mechanism generates a surface pressure by bringing the surface pressure generating medium into contact with the inner peripheral surface of the cup member in contact with the central peripheral region, and maintains the surface pressure generating medium in a non-contact state with respect to the central region. It has become. For this reason, in the cup member in which the surface pressure is applied to the inner surface by the surface pressure generating mechanism, the surface pressure is applied to the central peripheral region, and the surface pressure is not applied to the central region.
When the surface pressure acts on the inner surface of the cup member as a whole, the bending moment due to the distributed load increases at the central portion of the cup member, and the stress at that portion increases. For this reason, in the prior art, by applying a load in a direction opposite to the direction in which the surface pressure is applied, the central portion of the cup member is alleviated from becoming a high stress. However, according to the present invention, as described above, since the surface pressure acts on the central peripheral region and the surface pressure does not act on the central region, the bending acting on the central portion of the cup member due to the distributed load is maintained. Since the moment can be made much smaller than before, it is possible to efficiently suppress an excessive increase in stress at the central portion. Thereby, the stress distribution at the center portion of the cup member can be made close to the stress distribution of the same level as the peripheral portion without excessively increasing the stress compared to the peripheral portion. The mechanism for generating the surface pressure and the load may be a simple configuration including only the surface pressure generating mechanism described above, and does not require another mechanism for applying a load opposite to the direction in which the surface pressure is applied. Become.
Therefore, it is possible to provide a test device for a hip joint cup member that can make the stress distribution in the cup member more uniform and can greatly suppress the complexity of the device configuration.

  The test apparatus for a hip joint cup member according to a second aspect of the present invention is the test device for a hip joint cup member according to the first aspect, wherein the surface pressure generating mechanism is in contact with the inner surface of the cup member and the central region. An indenter that is a surface pressure generating medium that partitions the space adjacent to the center region without contacting the center region, and a biasing mechanism that generates a biasing load from the indenter toward the inner surface of the cup member. And the indenter presses the inner surface of the cup member by an urging load by the urging mechanism to generate a surface pressure in the central peripheral region, and the non-contact between the indenter and the central region It is characterized by keeping the state.

  According to the present invention, the indenter, which is a surface pressure generating medium that comes into contact with the central peripheral region without contacting the central region, presses the inner surface of the cup member by the urging load by the urging mechanism. By such a surface pressure generating mechanism comprising an indenter and an urging mechanism, a surface pressure generating mechanism that generates a surface pressure in the central peripheral region and keeps the surface pressure generating medium in a non-contact state with respect to the central region is simplified. It can be realized by the configuration.

  The test apparatus for a hip joint cup member according to a third aspect of the present invention is the test apparatus for a hip joint cup member according to the second aspect, wherein the indenter is formed in a shape along the inner surface of the cup member and is formed in the central peripheral region. A first ring-shaped curved surface portion that is in contact with the central region, and the first ring-shaped curved surface portion is surrounded by the first ring-shaped curved surface portion and is flat; the first ring-shaped curved surface portion is in contact with the central peripheral region; In contrast, it has a flat portion facing through a space, and an urging load acting portion that is formed on the opposite side of the flat portion and on which an urging load is applied by the urging mechanism. .

  According to this invention, the first ring-shaped curved surface portion is in contact with the central peripheral region of the inner surface of the cup member, and the flat portion surrounded by the first ring-shaped curved surface portion is opposed to the central region via the space. Become. In this state, the urging load by the urging mechanism acts from the urging load acting portion on the side opposite to the flat portion, so that the surface pressure acts on the central peripheral region without the surface pressure acting on the central region. It will be. By using such an indenter, a surface pressure generating mechanism that generates a surface pressure in the central peripheral region and keeps the surface pressure generating medium in a non-contact state with respect to the central region can be realized with a very simple configuration. .

  The test apparatus for a hip joint cup member according to a fourth aspect of the present invention is the test apparatus for the hip joint cup member according to the second aspect, wherein the indenter is formed in a shape along the inner surface of the cup member and is located in the central peripheral region. A second ring-shaped curved surface portion that contacts, and a state that the second ring-shaped curved surface portion is surrounded by the second ring-shaped curved surface portion and penetrates the indenter, and the second ring-shaped curved surface portion is in contact with the central peripheral region And a biasing load acting portion that is formed around the through hole on the opposite side of the second ring-shaped curved surface portion and is subjected to a biasing load by the biasing mechanism. It is characterized by having.

  According to the present invention, the second ring-shaped curved surface portion comes into contact with the central peripheral region of the inner surface of the cup member, and the through hole surrounded by the second ring-shaped curved surface portion faces the central region as a space. In this state, the urging load by the urging mechanism acts from the urging load acting portion on the side opposite to the second ring-shaped curved surface portion, so that the surface pressure does not act on the central region and the surface of the central peripheral region Pressure will act. By using such an indenter, a surface pressure generating mechanism that generates a surface pressure in the central peripheral region and keeps the surface pressure generating medium in a non-contact state with respect to the central region can be realized with a very simple configuration. .

  An apparatus for testing a cup member for an artificial hip joint according to a fifth aspect of the present invention is the apparatus for testing a cup member for an artificial hip joint according to the first aspect of the present invention, wherein the surface pressure generating mechanism A first seal portion that abuts at a position along the boundary with the central region; a second seal portion that abuts at an inner periphery of the cup member at a location along the outer periphery of the central peripheral region; the first seal portion; A pressure chamber that presses the inner surface of the cup member through the second seal portion and is introduced with pressure liquid as the surface pressure generating medium as a space adjacent to the central peripheral region is provided between the inner surface of the cup member. And a pressure liquid supply mechanism that supplies a pressure liquid to the hydraulic chamber, and the center by supplying the pressure liquid to the hydraulic chamber by the pressure liquid supply mechanism. Surrounding area Characterized in that to keep the non-contact state between the central region and the pressure fluid causes generating surface pressure.

  According to the present invention, the hydraulic pressure chamber partitioning member is opposed to the inner surface of the cup member via the first seal portion and the second seal portion, and partitions the hydraulic pressure chamber into which the pressure liquid is introduced. Then, when the pressure liquid is supplied from the pressure liquid supply mechanism to the fluid pressure chamber, the pressure liquid that is a surface pressure generating medium that does not contact the center region but contacts the center peripheral region is applied to the inner surface of the cup member. Is generated. By such a surface pressure generating mechanism including the first and second seal portions, the fluid pressure chamber partitioning member, and the pressure liquid supply mechanism, a surface pressure is generated in the central peripheral region and a surface pressure generating medium is applied to the central region. It is possible to realize a surface pressure generating mechanism that keeps the contactless state with a simple configuration.

  The hip joint cup member testing device according to a sixth aspect of the present invention is the artificial hip joint cup member testing device according to the fifth aspect of the present invention, wherein the pressure liquid supply mechanism is connected to a pump for discharging the pressure liquid and the pump. And a pressure liquid passage that passes through the inside of the fluid pressure chamber partition member and communicates with the fluid pressure chamber between the first seal portion and the second seal portion. And

  According to this invention, the pressure liquid discharged from the pump is reliably supplied to the hydraulic chamber without leaking in the middle through the pressure liquid passage formed so as to pass through the inside of the hydraulic chamber partition member. For this reason, by providing such a simple pressure liquid passage in the hydraulic pressure chamber partition member, it is possible to easily realize a structure capable of supplying the pressure liquid to the hydraulic pressure chamber even when the pressure liquid is high pressure. Can do.

  The test device for a hip joint cup member according to a seventh aspect of the present invention is the test device for the artificial hip joint cup member according to the fifth or seventh aspect, wherein each of the first seal portion and the second seal portion is made of a resin material. A ring-shaped first resin seal formed by a ring-shaped second resin seal formed of a resin material having a hardness higher than that of the resin material forming the first resin seal, and each of the first resins The seal is disposed so as to face each other through the hydraulic chamber, and the second resin seals are disposed adjacent to the first resin seal on the opposite side of the hydraulic chamber. It is characterized by that.

  According to this invention, the pressure liquid supplied to the hydraulic chamber between the hydraulic chamber partition member and the inner surface of the cup member is sealed by the first seal portion and the second seal portion. Each of the first seal portion and the second seal portion includes a first resin seal having a low hardness disposed on the inner side (hydraulic pressure chamber side) and the outer side (opposite to the hydraulic pressure chamber with respect to the first resin seal). And a second resin seal having a high hardness. For this reason, while being able to exhibit the high followability with respect to the sealing object surface by arranging the 1st resin seal which is easy to change inside, high rigidity is arranged by arranging the 2nd resin seal with high hardness on the outside. The function as the provided sealing member can also be exhibited. In this way, by forming a multi-layer structure of the inner first resin seal and the outer second resin seal, the first resin seal mainly deforms at low pressure to seal the pressure liquid, and at high pressure Furthermore, since the second resin seal can be deformed to seal the pressure liquid, the pressure liquid can be steadily sealed over a wide pressure range from low pressure to high pressure.

  An apparatus for testing a cup member for an artificial hip joint according to an eighth aspect of the present invention is the apparatus for testing a cup member for an artificial hip joint according to any one of the second to fourth aspects, wherein the inner surfaces of the pair of cup members face each other. A pair of the outer surface side support members that are supported from the outer surface side on each side, and the biasing mechanism presses the pair of outer surface side support members in a direction in which the outer surface side support members face each other. Thus, an urging load is generated from the indenter toward each inner surface of the pair of cup members.

  According to the present invention, the pair of outer surface side support members for supporting the pair of cup members from the outer surface side is provided on each side so that the inner surface faces each other, and the urging mechanism has the pair of outer surface side support tools. The urging load is generated by pressing in the direction in which they face each other. For this reason, in the test apparatus of this invention, it becomes possible to test a pair of cup member simultaneously. As described above, since two cup members can be tested in one test, the test efficiency can be greatly improved, and the cost and man-hours required for the test can be greatly reduced. Further, by using a test apparatus including a plurality of pairs of the above-described pair of outer surface side support tools, a plurality of pairs of cup members can be tested simultaneously. In this case, many cup members can be tested in one test, and the test efficiency can be dramatically improved. In the test apparatus of the present invention, only one urging mechanism needs to be provided for the pair of outer surface side support tools, so that the pair of cup members can be tested with one urging mechanism. Furthermore, the configuration of the test apparatus can be simplified.

  An artificial hip joint cup member testing apparatus according to a ninth aspect of the present invention is the artificial hip joint cup member testing apparatus according to any one of the fifth to seventh aspects of the present invention, such that the inner surfaces of the pair of cup members face each other. A pair of the outer surface side support members that are supported from the outer surface side on each side, and the hydraulic chamber partitioning member includes a pair of the hydraulic chambers between the inner surfaces of the pair of cup members, respectively. And the pressure liquid supply mechanism supplies the pressure liquid to each of the pair of hydraulic chambers.

  According to this invention, a pair of outer surface side support tools that support the pair of cup members from the outer surface side are provided on the sides so that the inner surfaces of the pair of cup members face each other, and between the inner surfaces of the pair of cup members. The pressure liquid supply mechanism supplies the pressure liquid to the pair of hydraulic chambers partitioned by the hydraulic chamber partition member. For this reason, in the test apparatus of this invention, it becomes possible to test a pair of cup member simultaneously. As described above, since two cup members can be tested in one test, the test efficiency can be greatly improved, and the cost and man-hours required for the test can be greatly reduced. Further, by using a test apparatus including a plurality of sets of the above-described pair of outer surface side support tools and hydraulic chamber partition members, a plurality of pairs of cup members can be tested simultaneously. In this case, many cup members can be tested in one test, and the test efficiency can be dramatically improved. In the test apparatus of the present invention, since only one set of the fluid pressure chamber partition member and the pressure liquid supply mechanism needs to be provided for the pair of outer surface side support tools, The test can be performed with the pressure chamber partition member and the pressure liquid supply mechanism, and the configuration of the test apparatus can be simplified.

  In addition, you may comprise the testing apparatus of the cup member for artificial hip joints which concerns on the following 10th invention or 11th invention as invention which concerns on another viewpoint.

  An apparatus for testing an artificial hip joint cup member according to a tenth aspect of the present invention is an artificial hip joint cup member for detecting a defective cup member by applying a surface pressure to the inner surface of a cup member used in an artificial hip joint. It is a test apparatus, and a pair of outer surface side support tools that support the pair of cup members from the outer surface side so that the inner surfaces face each other, and contact along the inner surfaces of the pair of cup members A surface pressure generating member that generates a surface pressure by contacting the inner surface at the contact surface and a pair of the outer surface side support tools in a direction in which the outer surface side support tools face each other. Thus, a load generating mechanism that generates an urging load from the surface pressure generating member toward each inner surface of the pair of cup members is provided.

  According to the present invention, the pair of outer surface side support members that support the pair of cup members from the outer surface side are provided on the sides so that the inner surfaces face each other. Then, the load generating mechanism presses the pair of outer surface side support tools in the direction in which they oppose each other, thereby generating an urging load from the surface pressure generating member toward each inner surface of the pair of cup members. ing. For this reason, in the test apparatus of this invention, it becomes possible to test a pair of cup member simultaneously. As described above, since two cup members can be tested in one test, the test efficiency can be greatly improved, and the cost and man-hours required for the test can be greatly reduced. Further, by using a test apparatus including a plurality of pairs of the above-described pair of outer surface side support tools, a plurality of pairs of cup members can be tested simultaneously. In this case, many cup members can be tested in one test, and the test efficiency can be dramatically improved. In the test apparatus of the present invention, only one load generating mechanism needs to be provided for the pair of outer surface side support tools, so that the pair of cup members can be tested with one load generating mechanism. Furthermore, the configuration of the test apparatus can be simplified.

  An apparatus for testing an artificial hip joint cup member according to an eleventh aspect of the present invention is an artificial hip joint cup member for detecting a defective cup member by applying a surface pressure to the inner surface of a cup member used in an artificial hip joint. A test apparatus, a pair of outer surface side support tools for supporting the pair of cup members from the outer surface side on each side so that the inner surfaces face each other, and a seal member contacting the inner surface of the cup member; A hydraulic chamber partitioning element that presses the inner surface of the cup member through the seal member and partitions a hydraulic chamber into which pressurized liquid is introduced between the inner surface of the cup member, and pressure in the hydraulic chamber A pressure liquid supply mechanism for supplying a liquid, wherein the hydraulic chamber partitioning element partitions the pair of hydraulic chambers between the inner surfaces of the pair of cup members, and supplies the pressure liquid. Mechanism by supplying the respective pressure fluid to a pair of said hydraulic chamber, and wherein the generating the surface pressure on the inner surfaces of the pair of the cup member.

  According to this invention, a pair of outer surface side support tools that support the pair of cup members from the outer surface side are provided on the sides so that the inner surfaces of the pair of cup members face each other, and between the inner surfaces of the pair of cup members. The pressure liquid supply mechanism supplies pressure liquid to each of the pair of hydraulic chambers partitioned by the hydraulic chamber partition element, thereby applying surface pressure to the inner surfaces of the pair of cup members. Yes. For this reason, in the test apparatus of this invention, it becomes possible to test a pair of cup member simultaneously. As described above, since two cup members can be tested in one test, the test efficiency can be greatly improved, and the cost and man-hours required for the test can be greatly reduced. Furthermore, by using a test apparatus that includes a plurality of sets of the pair of outer surface side support tools and hydraulic chamber compartment elements described above, a plurality of pairs of cup members can be tested simultaneously. In this case, many cup members can be tested in one test, and the test efficiency can be dramatically improved. In the test apparatus of the present invention, since only one set of the hydraulic pressure chamber partition element and the pressure liquid supply mechanism needs to be provided for the pair of outer surface side support tools, The test can be performed with the pressure chamber partition element and the pressure liquid supply mechanism, and the configuration of the test apparatus can be simplified.

  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 test device for a cup member for an artificial hip joint for detecting a defective cup member by applying a surface pressure to the inner surface of the cup member used in the hip prosthesis. Is.

  First, an artificial hip joint cup member to be tested by the test apparatus according to the present embodiment will be described together with an artificial hip joint. FIG. 1 is a schematic diagram for explaining an artificial hip joint, and the placement of the artificial hip joint when an artificial hip joint replacement is performed on the left hip joint is shown by a pelvis 103 (shown by a two-dot chain line) and a femur 104 (cross-sectional view). It is shown together with As shown in FIG. 1, a cup member 100, a head ball 101, and a stem 102 are used in an artificial hip joint. The cup member 100 and the bone head ball 101 are shown in a cross-sectional view. The cup member 100 has an inner surface 100a formed so as to constitute a part of a spherical surface, and is disposed on the pelvis 103 side. The head ball 101 is disposed on the femur 104 side with respect to the cup member 100 and is further movably fitted to the cup member 100. This head ball 101 is coupled to a stem 102 which is a femoral component embedded in the femur 104. An artificial hip joint is constructed using these elements. The test apparatus according to the present embodiment is used to detect a defective cup member by applying a surface pressure to the inner surface 100a of the cup member 100 used in such an artificial hip joint.

(First embodiment)
FIG. 2 is a front view illustrating a test apparatus 1 for a hip joint cup member according to the first embodiment of the present invention (hereinafter, simply referred to as “test apparatus 1”), and FIG. 3 is a side view thereof. 2 and 3 includes a base case 11, an outer surface side support 12, a surface pressure generating mechanism 13, and the like. The surface pressure generating mechanism 13 includes an indenter 14 (see FIG. 5) and an urging mechanism 15. 2 and 3, the urging mechanism 15 includes a motor 16, a lift drive device 17, a control unit 18, a controller 19, an indenter support 20, and the like. The motor 16, the elevating drive device 17, and the indenter support 20 are arranged on the front side of the base case 11, and the control unit 18 and the controller 19 are arranged inside the base case 11.

  As shown in FIGS. 2 and 3, the motor 16 is connected to an elevating drive device 17 configured as a screw mechanism, and a support table 23 attached to the upper end portion of the elevating drive device 17 by the rotation of the motor 16. Ascending and descending operations are performed in the vertical direction. 2 and 3, the state before the lifting and lowering driving device 17 performs the lifting operation, and the state where the lifting table 17 is lifted in the direction of the arrow (A) in FIG. 2 (in FIG. 2). Both are indicated by a solid line and indicated by a two-dot chain line in FIG. On the support table 23 attached to the upper end portion of the elevating drive device 17, the outer surface side support tool 12 is arranged. Further, the indenter support 20 is attached to a bracket 24 attached to the upper part of the base case 11. Then, as will be described later, the indenter 14 and the cup member 100 to be tested are disposed between the outer surface side support tool 12 and the indenter support tool 20 (see FIG. 5), and the rotation of the motor 16 is controlled. By driving the elevating drive device 17 in the upward direction, the urging mechanism 15 can generate an urging load from the indenter 14 toward the inner surface 100 a of the cup member 100. A load cell 22 is disposed below the support table 23. The load cell 22 can detect a load acting on the cup member 100 between the support table 23 and the bracket 24, that is, between the indenter support 20 and the outer surface support 12. It has become. The load detection signal detected by the load cell 22 is input to the controller 19 via the signal line 25.

  FIG. 4 shows a block diagram of the test apparatus 1. As shown in FIG. 4, the control unit 18 includes a motor control device 21. The motor control device 21 is configured to control the rotation of the motor 16 based on a command input from the controller 19, whereby the lifting / lowering drive device 17 having a screw shaft connected to the motor 16 is lifted / lowered. It is designed to control the operation.

  The controller 19 shown in FIGS. 3 and 4 is configured using, for example, a general-purpose personal computer, and includes a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), and a hard disk (HD). The input / output circuit is provided. The controller 19 receives the load detection signal from the load cell 22 and outputs the motor 16 to the motor control device 21 so that the motor 16 is driven until a predetermined load is reached based on the load detection signal. A command will be input. Thus, by driving the motor 16 so as to have a predetermined load, a predetermined surface pressure acts on the inner surface 100 a of the cup member 100 via the indenter 14.

  FIG. 5 is a cross-sectional view showing a state in which the indenter 14 and the cup member 100 are disposed between the outer surface side support tool 12 and the indenter support tool 20. In addition, in FIG. 5, elements other than the indenter support tool 20 are shown with sectional drawing. As shown in FIG. 5, the cup member 100 to be tested has an outwardly open tapered surface 100 b provided on the outer surface side so as to constitute a part of the conical surface in the circumferential direction. It is formed along the edge portion. Further, as described above, the cup member 100 is formed with the inner surface 100a provided so as to constitute a part of the spherical surface.

  As shown in FIG. 5, the outer surface side support tool 12 includes a holding member 26, a ring-shaped support member 27, and a taper ring 28. The holding member 26 is formed as a box-shaped member that defines an inner space 29 having a peripheral wall formed in a cylindrical shape and opening upward, and is formed, for example, as a steel member. The holding member 26 is disposed on the support table 23 (see FIG. 2). The holding member 26 is provided with a concave portion 26a formed so as to be recessed in a circular step shape at a position along the inner peripheral edge portion that opens to the top.

  The ring-shaped support member 27 is formed as a ring-shaped member, for example, a steel member. The ring-shaped support member 27 is formed in a shape in which the outer peripheral portion and the bottom portion fit into the recess 26 a of the holding member 26. Further, on the inner peripheral side of the ring-shaped support member 27, an inner peripheral side tapered surface 27b is formed which is constricted in a mortar shape so as to constitute a part of a conical curved surface.

  The taper ring 28 is formed as a thin ring-shaped member, and is formed of, for example, a soft metal material such as copper having a higher ductility than steel, a hard resin material, or the like. The outer peripheral side of the taper ring 28 is formed as a tapered surface that constitutes a part of a conical curved surface so as to engage and fit in a wedge shape with respect to the inner peripheral side tapered surface 27a of the ring-shaped support member 27. Yes. Further, on the inner peripheral side of the taper ring 28, a taper support surface 28a is formed which is constricted in a mortar shape so as to constitute a part of a conical curved surface. A tapered surface 100b provided on the lateral outer periphery of the cup member 100 is engaged with and fitted into the tapered support surface 28a in a wedge shape. Accordingly, the cup member 100 is supported by the tapered ring 28 on the tapered surface 100b in a state where the cup member 100 is disposed in the internal space 29 inside the holding member 26. The taper ring 28 is supported by being engaged with the ring-shaped support member 27, and the ring-shaped support member 27 is supported by being engaged with the concave portion 26 a of the holding member 26. That is, the outer surface side support tool 12 is configured to support the cup member 100 on the side thereof from the outer surface side with the tapered surface 100b.

  Next, the indenter 14 that constitutes the surface pressure generating mechanism 13 together with the biasing mechanism 15 described above will be described. As shown in FIG. 5, the indenter 14 is formed as a member having a hemispherical top portion formed flat, and is provided with a first ring-shaped curved surface portion 14 a, a flat portion 14 b, and an urging load acting portion 14 c. Yes. The indenter 14 is made of a resin material (for example, polytetrafluoroethylene). And the 1st ring-shaped curved surface part 14a is formed in the shape along the inner surface 100a of the cup member 100, and is formed so that it may contact | abut to the center periphery area | region 100c including the periphery of the center area | region 100b including the center part in the inner surface 100a. Has been. The flat portion 14b is surrounded and flatly surrounded by the first ring-shaped curved surface portion 14a, and is centered in a state where the first ring-shaped curved surface portion 14a is in contact with the central peripheral region 100c (the state in FIG. 5). It faces the region 100b through the space 30. The urging load acting portion 14c is provided as a portion that abuts the tip portion of the indenter support 20 between the flat surfaces. In other words, the urging load acting portion 14 c is formed as a portion that is formed on the opposite side of the flat portion 14 b and the urging load by the urging mechanism 15 acts via the tip of the indenter support 20. The indenter 14 may be fixed with respect to the tip of the indenter support 20 or may be arranged in an unfixed state, and any of them can be applied in this embodiment. .

  The indenter 14 has the above-described configuration, so that the inner surface 100a of the cup member 100 is not in contact with the center region 100b but defines the space 30 adjacent to the center region 100b and is in contact with the center peripheral region 100c. It is provided as a surface pressure generating medium that generates surface pressure (in contact). Further, by providing the indenter 14 and the urging mechanism 15, the surface pressure generating mechanism 13 generates surface pressure on the inner surface 100 a of the cup member 100 by bringing the indenter 14 into contact with the central peripheral region 100 c. A mechanism for keeping the indenter 14 in a non-contact state with respect to the central region 100b is provided.

  Next, a test method for detecting a defective cup member by applying a surface pressure to the inner surface 100a of the cup member 100 by the above-described test apparatus 1 (this test is hereinafter referred to as a proof test) will be described. . When performing the proof test, first, the outer drive unit 17 is driven to place the outer surface support 12 on the support table 23 with the support table 23 raised to a predetermined position. The cup member 100 is supported on the tool 12 as described above. And the indenter 14 is arrange | positioned with respect to the inner surface 100a of the cup member 100 so that the center of the inner surface 100a of the cup member 100 and the center of the indenter 14 (center of the flat part 14b) may be located on the same line. In this state, the height of the support table 23 is adjusted as appropriate so that the tip of the indenter support 20 is in a position where it comes into contact with the biasing load acting portion 14c of the indenter 14. In this state, the motor 16 can apply an urging load as the urging mechanism 15.

  In the proof test, first, the motor 16 is driven based on a command from the controller 19 to start applying a biasing load to the cup member 100. After starting the application of the urging load, the motor 16 gradually controls based on a command from the controller 19 until a predetermined load that can apply the surface pressure necessary for the proof test to the inner surface 100a of the cup member 100 is reached. Is done. In this state, the test apparatus 1 causes the indenter 14 to press the inner surface 100a of the cup member 100 by the urging load by the urging mechanism 15 to generate a surface pressure in the central peripheral region 100c, and the central region of the indenter 14 The non-contact state with 100b is maintained. After reaching a predetermined load, the state is maintained for a predetermined time, and if the cup member 100 is not damaged such as a crack, the proof test is passed.

  According to the test apparatus 1 described above, the cup member 100 is applied with a surface pressure by the surface pressure generating mechanism 13 on the inner surface 100a while being supported from the outer surface side of the cup member 100. The surface pressure generating mechanism 13 generates a surface pressure by bringing the indenter 14 that is a surface pressure generating medium into contact with the center peripheral region 100c with respect to the inner surface 100a of the cup member 100, and at the same time, the indenter 14 with respect to the center region 100b. Is kept in a non-contact state. For this reason, in the cup member 100 in which the surface pressure is applied to the inner surface 100a by the surface pressure generating mechanism 13, the surface pressure acts on the central peripheral region 100c, and the surface pressure is not applied in the central region 100b. It will be.

  Note that the inventors of the present application perform a simulation by the finite element method and apply a surface pressure to the inner surface 100a of the cup member 100 as a whole (condition 1). When a supporting force opposite to the direction is applied (condition 2), the surface pressure applied by the test apparatus 1 according to the present embodiment (that is, the indenter 14 does not contact the central region 100b and the central peripheral region 100c). The stress distribution generated in the cup member 100 was analyzed for each of the cases (condition 3) in which the surface pressure generated by contact with the surface was applied. FIG. 15, FIG. 16, and FIG. 17 show the analysis results under condition 1, condition 2, and condition 3, respectively. As a result, when the surface pressure of the level required for the proof test is generated in the cup member 100, as shown in FIG. 15, a region where the stress is excessively high is generated in the center of the cup member 100 as shown in FIG. . On the other hand, as shown in FIG. 16 and FIG. 17, in condition 2 and condition 3, even if the surface pressure of the level required for the proof test is generated in the cup member 100, It was confirmed that the stress distribution at the same level in the portion could be obtained. That is, as shown in FIG. 17, in condition 3, the center portion of the cup member 100 and the peripheral portion thereof are equivalent even if a mechanism for applying a supporting force opposite to the surface pressure direction is not separately provided. It was confirmed that the stress distribution of the level can be achieved.

Thus, according to the test apparatus 1, since the surface pressure acts on the center peripheral region 100c and the surface pressure is not applied in the center region 100b, it acts on the center portion of the cup member 100 by the distributed load. Since the bending moment can be significantly reduced as compared with the conventional case, it is possible to efficiently suppress the stress at the central portion from becoming excessively high. Thereby, the stress distribution at the center portion of the cup member 100 can be brought close to the stress distribution of the same level as the peripheral portion without excessively increasing the stress as compared with the peripheral portion. The mechanism for generating the surface pressure and the load may be a simple structure including only the surface pressure generating mechanism 13 described above, and does not require another mechanism for applying a load opposite to the direction in which the surface pressure is applied. It becomes.
Therefore, the stress distribution in the cup member 100 can be made more uniform and the cup device test apparatus 1 for an artificial hip joint can be provided that can greatly reduce the complexity of the device configuration.

  Further, according to the test apparatus 1, the indenter 14, which is a surface pressure generating medium that comes into contact with the central peripheral region 100 c without contacting the central region 100 b, presses the inner surface 100 a of the cup member 100 by the urging load by the urging mechanism 15. To do. The surface pressure generating mechanism 13 including the indenter 14 and the urging mechanism 15 generates surface pressure in the central peripheral region 100c and maintains the surface pressure generating medium in a non-contact state with respect to the central region 100b. The generation mechanism can be realized with a simple configuration.

  Further, according to the test apparatus 1, the first ring-shaped curved surface portion 14a abuts on the central peripheral region 100c of the inner surface 100a of the cup member 100, and the flat portion 14b surrounded by the first ring-shaped curved surface portion 14a becomes the central region 100b. On the other hand, they face each other through the space 30. In this state, the urging load by the urging mechanism 15 acts from the urging load acting portion 14c on the side opposite to the flat portion 14b, so that no surface pressure acts on the central region 100b and the central peripheral region 100c does not act. Surface pressure will act. By using such an indenter 14, a surface pressure generating mechanism 13 that generates a surface pressure in the central peripheral region 100c and keeps the surface pressure generating medium in a non-contact state with respect to the central region 100b is realized with a very simple configuration. can do.

(First modification of the first embodiment)
Next, a modification of the first embodiment will be described. FIG. 6 is a diagram illustrating a first modification of the first embodiment, and is a cross-sectional view showing a state in the vicinity of the indenter 31 and the cup member 100 as in FIG. The test apparatus according to the first modification whose main part is shown in FIG. 6 is configured in the same manner as the test apparatus 1, but the configuration of the indenter 31 is different from that of the test apparatus 1. In addition, since elements other than the indenter 31 are configured in the same manner as the test apparatus 1, the same reference numerals are used in FIG.

  As shown in FIG. 6, the indenter 31 is formed as a member in which a hole penetrating the hemispherical top portion is formed, and is provided with a second ring-shaped curved surface portion 31a, a through hole 31b, and an urging load acting portion 31c. It has been. The indenter 31 is made of a resin material (for example, polytetrafluoroethylene). And the 2nd ring-shaped curved surface part 31a is formed in the shape in alignment with the inner surface 100a of the cup member 100, and is formed so that the center periphery area | region 100c in the inner surface 100a may be contact | abutted. The through hole 31b is formed so as to be surrounded by the second ring-shaped curved surface portion 31a and to penetrate the indenter 31. The through hole 31b faces the center region 100b as a space in a state where the ring-shaped curved portion 31a is in contact with the center peripheral region 100c. The urging load acting part 31c is formed around the through hole 31b on the side opposite to the second ring-shaped curved surface part 31a, and the urging load by the urging mechanism 15 acts through the tip of the indenter support tool 20. Is formed. The indenter 31 may be fixed with respect to the tip of the indenter support 20 or may be arranged in an unfixed state, and any of them can be applied in the first modified example. it can.

  Since the indenter 31 has the above-described configuration, similarly to the indenter 14 of the test apparatus 1, the inner surface 100 a of the cup member 100 is partitioned from the center region 100 b without contacting the center region 100 b. In addition, it is provided as a surface pressure generating medium that abuts (contacts) the center peripheral region 100c to generate a surface pressure.

  Similarly to the test apparatus 1, the test apparatus according to the first modification described above can make the stress distribution in the cup member 100 more uniform and can significantly suppress the complexity of the apparatus configuration. A test apparatus for a hip cup member can be provided. According to the test apparatus according to the first modification, the second ring-shaped curved surface portion 31a is in contact with the central peripheral region 100c of the inner surface 100a of the cup member 100 and is surrounded by the second ring-shaped curved surface portion 31a. 31b is opposed to the central region as a space. In this state, the urging load by the urging mechanism 15 acts from the urging load acting portion 31c on the side opposite to the second ring-shaped curved surface portion 31a, so that the surface pressure does not act on the central region 100b. A surface pressure acts on the peripheral region 100c. By using such an indenter 31, a surface pressure generating mechanism that generates a surface pressure in the central peripheral region 100c and keeps the surface pressure generating medium in a non-contact state with respect to the central region 100b is realized with a very simple configuration. be able to.

(Second modification of the first embodiment)
The following modification will be described. FIG. 7 is a diagram for explaining a second modification of the first embodiment, and is a cross-sectional view showing a state in the vicinity of the indenter 14 and the cup member 100 as in FIG. The test apparatus according to the second modification whose main part is shown in FIG. 7 is configured in the same manner as the test apparatus 1, but includes a pair of outer surface side support tools (12, 12) and a pair of cup members (100, 100) is different from the test apparatus 1 in that the proof test can be performed simultaneously. In addition, about the element comprised similarly to the test apparatus 1, the same code | symbol is attached | subjected in FIG. 7, and description is omitted.

  As shown in FIG. 7, the test apparatus according to the second modification includes a pair of outer surface side support tools (12, 12) and a pair of indenters (14, 14). The pair of outer surface side support tools (12, 12) are arranged so as to support the pair of cup members (100, 100) from the outer surface side at the respective sides so that the inner surfaces 100a face each other. And each cup member 100 is arrange | positioned similarly to the test apparatus 1 between each outer surface side support tool 12 and each indenter 14. FIG.

  Further, in the test apparatus according to the second modification, the configuration of the indenter support tool 32 is different from that of the indenter support tool 20 of the test apparatus 1. The indenter support tool 32 is formed as a cylindrical member, and is arranged between the pair of indenters (14, 14). Then, both end surfaces (32a, 32a) of the indenter support tool 32 come into contact with the respective urging load acting portions 14c of the pair of indenters (14, 14). That is, in the test apparatus according to the second modification, a pair of indenters (14, 14) are arranged on both sides in the vertical direction of the indenter support 32, and a pair of cup members (100, 100) are further arranged on both sides in the vertical direction. Are arranged such that the inner surfaces 100a face each other, and a pair of outer surface side support tools (12, 12) are arranged on both sides in the vertical direction. The indenter support tool 32, the pair of indenters (14, 14), the pair of cup members (100, 100), and the pair of outer surface side support tools (12, 12) include a support member 33 attached to the bracket 24. And the support table 23. And the urging | biasing mechanism 15 presses a pair of outer surface side support tools (12, 12) toward the direction where these outer surface side support tools 12 oppose each other, From each indenter 14, a pair of cup member (100, 100), an urging load toward each inner surface 100a is generated.

  Similarly to the test apparatus 1, the test apparatus according to the second modified example described above can make the stress distribution in the cup member 100 more uniform and can significantly suppress the complexity of the apparatus configuration. A test apparatus for a hip cup member can be provided. And according to the testing apparatus concerning this 1st modification, a pair of outer surface side support which supports a pair of cup members (100, 100) from the outer surface side in each side so that each inner surface 100a may counter each other. (12, 12) are provided, and the urging mechanism 15 presses the pair of outer surface side supporters (12, 12) in the direction in which they face each other to generate an urging load. For this reason, in the test apparatus according to this modification, it is possible to test a pair of cup members (100, 100) simultaneously. As described above, since the two cup members 100 can be tested in one test, the test efficiency can be greatly improved, and the cost and man-hours required for the test can be greatly reduced. . Furthermore, by using a test apparatus including a plurality of pairs of the above-described pair of outer surface side support tools (12, 12), a plurality of pairs of cup members 100 can be tested simultaneously. In this case, many cup members 100 can be tested in one test, and the test efficiency can be dramatically improved. In the test apparatus according to this modification, only one urging mechanism 15 needs to be provided for the pair of outer surface side support tools (12, 12), and thus the pair of cup members (100, 100). ) Can be tested by one urging mechanism 15, and the configuration of the test apparatus can be simplified. As a further modification of the present modification, a pair of indenters (14, 14) and an indenter support 32 may be formed integrally.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 8 is a side view illustrating a test apparatus 2 (hereinafter simply referred to as “test apparatus 2”) for a hip joint cup member according to the second embodiment. FIG. 9 is a block diagram of the test apparatus 2, and FIG. 10 is a cross-sectional view showing a state in the vicinity of the cup member 100. The test apparatus 2 shown in FIGS. 8 to 10 includes a base case 11, an outer surface side support tool 12, a surface pressure generating mechanism 34, and the like. The surface pressure generating mechanism 34 includes the motor 16, the lift drive device 17, the control unit 18 a, the controller 19 a, the pump unit 35, the first seal portion 41, the second seal portion 42, the hydraulic chamber partition member 47, and pressure water supply. A mechanism (pressure liquid supply mechanism) 48 and the like are provided. In the description of the second embodiment, the same elements as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 8, the pump unit 35 is provided with a pump 36 that pressurizes water sucked from a tank (not shown) and supplies it as pressure water (pressure liquid). The pressure water supplied from the pump 36 is The fluid chamber 38 is supplied via a water pipe 38 to a hydraulic chamber partition member 47 described later. Further, as shown in FIGS. 8 and 9, the water pressure of the pressure water is detected in the water pipe 38 which is a path for supplying water from the pump 36 to the hydraulic pressure chamber partition member 47 (shown by a broken arrow in FIG. 8). A water pressure meter 37 is provided. The water pressure detection signal detected by the water pressure meter 37 is input to the controller 19a through the signal line 39.

  As shown in FIG. 9, the control unit 18 a includes a motor control device 21 and a pump control device 40. The pump control device 40 controls the pressure of the pressure water discharged from the pump 36 by controlling, for example, the number of rotations of a pump motor (not shown) driving the pump 36 based on a command input from the controller 19a. It is supposed to be. The motor control device 21 is configured similarly to the motor control device 21 of the first embodiment.

  The controller 19a shown in FIGS. 8 and 9 is configured using, for example, a general-purpose personal computer, like the controller 19 of the first embodiment. As in the first embodiment, the controller 19a receives a load detection signal from the load cell 22, and based on the load detection signal, the motor controller 21 drives the motor 16 until a predetermined load is reached. The output command of the motor 16 is input to the head. Further, the controller 19a receives the above-described water pressure detection signal from the water pressure meter 37, and based on this water pressure detection signal, the pump 36 is driven to a pump controller 40 so that the pump 36 is driven until a predetermined water pressure is reached. 36 output commands are input. Thus, by driving the pump 36 so as to have a predetermined water pressure, a predetermined surface pressure acts on the inner surface 100a of the cup member 100 as a water pressure, as will be described later.

  Next, the configuration of the first seal portion 41, the second seal portion 42, the hydraulic pressure chamber partition member 47, and the pressure water supply mechanism 48 will be described based on FIG. 10 showing a sectional view of the vicinity of the cup member 100.

  The first seal portion 41 is provided as means for sealing the pressure water by contacting the inner surface 100a of the cup member 100 at a position along the boundary between the central peripheral region 100c and the central region 100b. The first seal portion 41 is fitted so as to be in close contact with a concave portion formed along the edge portion on the distal end side of the cylindrical tip cylindrical portion 47 a protruding stepwise in the hydraulic chamber partition member 47. The cup member 100 is disposed so as to be in close contact with the inner surface 100a. The first seal portion 41 is formed of a ring-shaped (annular) first resin seal 43 formed of a resin material and a resin material having a higher hardness than the resin material forming the first resin seal 43. The ring-shaped second resin seal 44 is provided. The first resin seal 43 has a circular cross section or an elliptic cross section perpendicular to the circumferential direction, and is made of, for example, polyethylene. Further, the second resin seal 44 has a quadrangular cross section perpendicular to the circumferential direction, and is made of, for example, silicon rubber. In the example shown in FIG. 10, the first resin seal 43 and the second resin seal 44 are disposed concentrically adjacent to each other in the radial direction along the inner surface 100 a of the cup member 100.

  The second seal portion 42 is provided as means for sealing the pressure water by contacting the inner surface 100a of the cup member 100 at a position along the outer periphery of the central peripheral region 100c. The second seal portion 42 is in close contact with a recess formed along the edge portion on the distal end side of the cylindrical body cylindrical portion 47 b that forms the outermost stepped portion of the hydraulic chamber partition member 47. And is arranged so as to be in close contact with the inner surface 100a of the cup member 100. And this 1st seal | sticker part 41 is harder than the resin material which forms the ring-shaped 1st resin seal 45 formed with the resin material, and this 1st resin seal 45 similarly to the 1st resin seal part 42. And a ring-shaped second resin seal 46 formed of a high resin material. The first resin seal 43 has a circular cross section or an elliptic cross section perpendicular to the circumferential direction, and is made of, for example, polyethylene. Further, the second resin seal 44 has a quadrangular cross section perpendicular to the circumferential direction, and is made of, for example, silicon rubber. In the example shown in FIG. 10, the first resin seal 45 and the second resin seal 46 are arranged so as to be stacked in the height direction along the inner surface 100 a of the cup member 100. ing.

  Further, the hydraulic chamber partition member 47 is attached to the bracket 24, and as described above, the hydraulic chamber partition member 47 is formed in an outer shape in which the front end cylindrical portion 47a protrudes stepwise from the body cylindrical portion 47b. The center of the outer circle of the body circle middle portion 47b and the center of the outer circle of the tip cylindrical portion 47a are arranged concentrically. The hydraulic chamber partition member 47 is a surface pressure generating medium as a space that presses the inner surface 100a of the cup member 100 via the first seal portion 41 and the second seal portion 42 and is adjacent to the central peripheral region 100c. The hydraulic chamber 50 into which pressure water is introduced is formed so as to be partitioned from the inner surface 100 a of the cup member 100. The first resin seals (43, 45) are arranged so as to face each other via the hydraulic chamber 50, and the second resin seals (44, 47) are arranged on the first resin seals (43, 45). On the other hand, it is arranged so as to be adjacent to the opposite side of the hydraulic chamber 50. The hydraulic pressure chamber partition member 47 is connected to the pump 36 via a water pipe 38 and communicates with the hydraulic pressure chamber 50 between the first seal portion 41 and the second seal portion 42. A passage (pressure liquid passage) 49 is formed. That is, the pressure water passage 49 is formed as a hole that passes through the inside of the hydraulic pressure chamber partition member 47.

  The pressure water supply mechanism 48 includes a pump 36 that discharges pressure water and the pressure water passage 49 described above, and is provided as means for supplying pressure water to the hydraulic pressure chamber 50. The test apparatus 2 supplies the pressurized water to the hydraulic chamber 50 sealed by the first seal portion 41 and the second seal portion 42 by the pressure water supply mechanism 48 so that the center peripheral region 100c on the inner surface 100a of the cup member 100 is obtained. In addition, the surface pressure is generated and the non-contact state between the pressure water and the central region is maintained.

  Next, a proof test method for detecting a defective cup member by applying a surface pressure to the inner surface 100a of the cup member 100 by the above-described test apparatus 2 will be described. When performing such a proof test, first, the driving device 17 is driven to raise the support table 23 to a predetermined position, and the outer surface side support tool 12 is placed on the support table 23. The cup member 100 is supported with respect to the support tool 12. Then, the outer surface support 12 and the cup member 100 are separated from the hydraulic chamber so that the center of the inner surface 100a of the cup member 100 and the center of the hydraulic chamber partition member 47 (center of the tip cylindrical portion 47a) are located on the same line. It arrange | positions with respect to the member 47. FIG. In this state, the height of the support table 23 is set so that the first seal portion 41 and the second seal portion 42 attached to the hydraulic pressure chamber partition member 47 are in a position where they abut against the inner surface 100a of the cup member 100. Adjust as appropriate. In this state, the proof test for applying a surface pressure to the inner surface 100a of the cup member 100 by the surface pressure generating mechanism 34 can be started.

  In the proof test, first, the motor 16 is driven based on a command from the controller 19 a to apply a preliminary load to the cup member 100. Then, with the preliminary load applied, the hydraulic pressure water based on the command from the controller 19a starts to be supplied from the pump 36 to the hydraulic chamber 50 through the water pipe 38 and the pressure water passage 49. At this time, since the water pressure in the hydraulic chamber 50 acts on the cup member 100, a load in the vertical direction acts on the cup member 100. After the start of the introduction of the pressure water into the hydraulic pressure chamber 50, until a predetermined water pressure is reached in order to apply a surface pressure necessary for the proof test to the inner surface 100a of the cup member 100 based on a command from the controller 19a. The pump 36 is controlled so that the water pressure gradually rises, and the motor 16 is gradually controlled until a predetermined load is reached while controlling the motor 12 correspondingly. While the hydraulic pressure is applied to the hydraulic chamber 50 in this way, the first seal portion 42 and the second seal portion 42 cause the central peripheral region 100c of the inner surface 100a of the cup member 100 and the hydraulic chamber partition member 47 to Is sealed. In this state, the test apparatus 2 generates a surface pressure in the central peripheral region 100c by supplying pressure water to the hydraulic pressure chamber 50 by the pressure liquid supply mechanism 48, and the pressure water and the central region 100b. A non-contact state is maintained. After reaching a predetermined load, the state is maintained for a predetermined time, and if the cup member 100 is not damaged such as a crack, the proof test is passed.

  According to the test apparatus 2 described above, the cup member 100 is applied with a surface pressure by the surface pressure generating mechanism 34 on the inner surface 100a while being supported from the outer surface side of the cup member 100. The surface pressure generating mechanism 34 generates a surface pressure by bringing pressure water, which is a surface pressure generating medium, into contact with the center peripheral region 100c with respect to the inner surface 100a of the cup member 100, and pressure water with respect to the center region 100b. Is kept in a non-contact state. For this reason, in the cup member 100 in which the surface pressure is applied to the inner surface 100a by the surface pressure generating mechanism 34, the surface pressure acts on the central peripheral region 100c, and the surface pressure is not applied on the central region 100b. It will be.

According to this test apparatus 2, since the surface pressure acts on the central peripheral region 100c and the surface pressure is not applied in the central region 100b, the bending moment acting on the central portion of the cup member 100 due to the distributed load is increased. Since it can be made much smaller than before, it is possible to efficiently suppress the stress at the central portion from becoming excessively high. Thereby, the stress distribution at the center portion of the cup member 100 can be brought close to the stress distribution of the same level as the peripheral portion without excessively increasing the stress as compared with the peripheral portion. The mechanism for generating the surface pressure and the load may be a simple configuration including only the surface pressure generating mechanism 34 described above, and does not require another mechanism for applying a load opposite to the direction in which the surface pressure is applied. It becomes.
Therefore, it is possible to provide the test device 2 for the artificial hip joint cup member that can make the stress distribution in the cup member 100 more uniform and can greatly suppress the complexity of the device configuration.

  Further, according to the test apparatus 2, the hydraulic pressure is such that the hydraulic pressure chamber partition member 47 is opposed to the inner surface 100 a of the cup member 100 through the first seal portion 41 and the second seal portion 42 and pressure water is introduced. The chamber 50 is partitioned. Then, by supplying the pressure water from the pressure water supply mechanism 48 to the hydraulic chamber 50, the pressure water, which is a surface pressure generating medium that contacts the center peripheral region 100c without contacting the center region 100b, becomes the cup member 100. A surface pressure is generated on the inner surface 100a. The surface pressure generating mechanism 34 including the first and second seal portions (41, 42), the hydraulic pressure chamber partitioning member 47, and the pressure water supply mechanism 48 generates surface pressure in the central peripheral region 100c and the center. The surface pressure generating mechanism 34 that keeps the surface pressure generating medium in a non-contact state with respect to the region 100b can be realized with a simple configuration.

  In addition, according to the test apparatus 2, the hydraulic water chamber can be surely leaked through the pressure water passage 49 formed so that the pressure water discharged from the pump 36 passes through the inside of the hydraulic chamber compartment member 47. 50. Therefore, by providing such a simple pressure water passage 49 in the hydraulic pressure chamber partition member 47, a structure that can supply the pressure water to the hydraulic pressure chamber 50 even when the pressure water is high pressure can be easily obtained. Can be realized.

  Further, according to the test apparatus 2, the pressure water supplied to the hydraulic chamber 50 between the hydraulic chamber partition member 47 and the inner surface 100 a of the cup member 100 is caused by the first seal portion 41 and the second seal portion 42. Sealed. Each of the first seal portion 41 and the second seal portion 42 includes a first resin seal (43, 45) having a low hardness and an outer side (first resin seal ( 43, 45) and a second resin seal (44, 46) which is disposed on the opposite side of the hydraulic chamber 50 and has high hardness. Therefore, the first resin seal (43, 45) that is easily deformed can be provided on the inner side to exhibit high followability to the surface to be sealed, and the second resin seal (44, 46) having high hardness. The function as a sealing member having high rigidity can also be exhibited by disposing on the outside. In addition, by forming a multi-layer structure of the inner first resin seal (43, 45) and the outer second resin seal (44, 46) in this way, the first resin seal (43, 45) is mainly used at low pressure. ) Is deformed to seal the pressure water, and when the pressure is high, the second resin seal (44, 46) can be further deformed to seal the pressure water. Pressure water can be steadily sealed.

(First Modification of Second Embodiment)
Next, a modification of the second embodiment will be described. FIG. 11 is a diagram illustrating a first modification example of the second embodiment, and is a cross-sectional view illustrating a state in the vicinity of the second seal portion 51. The test apparatus according to the first modification whose main part is shown in FIG. 11 is configured in the same manner as the test apparatus 2, but the configuration of the first seal part (not shown) and the second seal part 51 is the test apparatus 2. Is different.

  As shown in FIG. 11 (a), the second seal portion 51 is disposed at the same position as the second seal portion 42 of the test apparatus 2, but unlike the second seal portion 42, it has a three-layer seal structure. It is provided as a means for sealing water. The second seal portion 51 includes a ring-shaped first resin seal 52 formed of a resin material, and a ring-shaped first resin seal 52 formed of a resin material having higher hardness than the resin material forming the first resin seal 52. 2 resin seal 53 and metal metal seal 54 are provided. The first resin seal 52 has a circular or elliptical cross section perpendicular to the circumferential direction, and is made of, for example, polyethylene. The second resin seal 53 has a trapezoidal cross section perpendicular to the circumferential direction, and is formed of, for example, silicon rubber. A tapered surface 53a constituting a part of a conical curved surface is formed on the outer peripheral side of the second resin seal 53, and comes into contact with the inner surface 100a of the cup member 100 at the tapered surface 53a. .

  The cross section perpendicular to the circumferential direction of the metal seal 54 is formed as a trapezoidal cross section or a pentagonal cross section, and is formed of copper as a soft metal material, for example. FIG. 11B is an enlarged cross-sectional view showing the outer peripheral side of the metal seal 54. On the outer peripheral side of the metal seal 54, there are a tapered surface 54a constituting a part of a conical curved surface, and a tapered surface. A chamfered portion 54b formed on the narrowed end side of 54a is provided. The metal seal 54 abuts against the inner surface 100a of the cup member 100 at the tapered surface 54a and the chamfered portion 54b, thereby reducing excessive contact stress and generating wrinkles on the inner surface 100a. To prevent this. In the example shown in FIG. 11, the first resin seal 52, the second resin seal 53, and the metal seal 54 are stacked in the height direction along the inner surface 100 a of the cup member 100. It is arranged. FIG. 11C shows a metal seal 55 which is a modification of the metal seal 54. In the metal seal 54, a tapered surface 54a and a chamfered portion 54b are provided on the outer peripheral side thereof. However, as the metal seal 55 shown in FIG. The taper-shaped surface 55a and the taper-shaped surface 55b may be provided.

  Although not shown in FIG. 11, in this modification, the first seal portion is also provided as a three-layer seal structure including a first resin seal, a second resin seal, and a metal seal. And in the 1st seal part and the 2nd seal part 51, it arrange | positions so that each 1st resin seal may mutually oppose via the hydraulic chamber 50, and each 2nd resin seal is with respect to each 1st resin seal. It arrange | positions so that it may adjoin on the opposite side of the hydraulic chamber 50, Furthermore, each metal seal is arrange | positioned so that it may adjoin on the opposite side of each 1st resin seal with respect to each 2nd resin seal. As described above, since the first seal portion and the second seal portion 51 have a three-layer seal structure, the pressure water can be sealed with the metal seal even outside the second resin seal. Pressure water can be steadily sealed over a wide range.

(Second Modification of Second Embodiment)
The following modification will be described. FIG. 12 is a diagram illustrating a second modification of the second embodiment, and is a cross-sectional view illustrating a state in the vicinity of the cup member 100. The test apparatus according to the second modification whose main part is shown in FIG. 12 is configured in the same manner as the test apparatus 2, but includes a pair of outer surface side support tools (12, 12) and a pair of cup members (100, 100) is different from the test apparatus 2 in that the proof test can be performed simultaneously. In addition, about the element comprised similarly to the test apparatus 2, the same code | symbol is attached | subjected in FIG.

  As shown in FIG. 12, in the test apparatus according to the second modification, the pair of outer surface side support tools (12, 12), the first seal portion 56, the second seal portion 57, and the hydraulic chamber partition member 58. The pair of outer surface side support tools (12, 12) are arranged so as to support the pair of cup members (100, 100) from the outer surface side at the respective sides so that the inner surfaces 100a face each other. The first seal portion 56 and the second seal portion 57 are disposed at the same positions as the first seal portion 41 and the second seal portion 42 of the test apparatus 2, respectively, but both are formed in a ring shape having a circular cross section, It is provided as resin. The first seal portion 56 and the second seal portion 57 are provided in pairs, corresponding to the pair of cup members (100, 100).

  The hydraulic chamber partition member 58 presses the inner surface 100a of the cup member 100 via each first seal portion 56 and each second seal portion 57, and pressure water is introduced as a space adjacent to the central peripheral region 100c. The pair of hydraulic chambers (50, 50) are provided so as to be partitioned from each inner surface 100a of the pair of cup members (100, 100). Further, the hydraulic chamber partition member 58 is formed with a pressure water passage 59 connected to the water pipe 38 so as to branch into two hands and communicate with each of the pair of hydraulic chambers (50, 50). The pressure water supply mechanism configured to include the pump 36 and the pressure water passage 59 supplies pressure water to the pair of hydraulic chambers (50, 50), respectively.

  Similarly to the test apparatus 2, the test apparatus according to the second modification described above can make the stress distribution in the cup member 100 more uniform and can significantly suppress the complexity of the apparatus configuration. A test apparatus for a hip cup member can be provided. And according to the testing apparatus concerning this 2nd modification, a pair of outer surface side support which supports a pair of cup members (100, 100) from the outer surface side in each side so that each inner surface 100a may counter each other. (12, 12) are provided, and with respect to the pair of hydraulic chambers (50, 50) partitioned by the hydraulic chamber partition member 58 between the inner surfaces 100a of the pair of cup members (100, 100), Each of the pressure water supply mechanisms supplies pressure water. For this reason, in the test apparatus according to this modification, it is possible to test a pair of cup members (100, 100) simultaneously. As described above, since two cup members (100, 100) can be tested in one test, the test efficiency can be greatly improved, and the cost and man-hour required for the test can be greatly reduced. can do. Furthermore, by using a test apparatus including a plurality of sets of the pair of outer surface side supporters (12, 12) and the hydraulic pressure chamber partition member 58, it is possible to simultaneously test a plurality of pairs of cup members 100. Become. In this case, many cup members 100 can be tested in one test, and the test efficiency can be dramatically improved. In the test apparatus according to this modification, only one set of the hydraulic chamber partition member 58 and the pressure water supply mechanism needs to be provided for the pair of outer surface side supports (12, 12). The cup member (100, 100) can be tested with one set of the hydraulic chamber partition member 58 and the pressure water supply mechanism, and the configuration of the test apparatus can be simplified.

(Other embodiments)
Next, another embodiment of the present invention will be described. FIG. 13 is a view for explaining a testing device for a hip joint cup member according to another embodiment, and is a cross-sectional view showing a state in the vicinity of the cup member 100. The test apparatus shown in FIG. 13 is a test apparatus for an artificial hip joint cup member for applying a surface pressure to the inner surface 100a of the cup member 100 to detect a defective cup member, which is a first embodiment. It is comprised similarly to the test apparatus which concerns on the 2nd modification. That is, a pair of outer surface side support tools (12, 12) is provided, and a configuration capable of simultaneously performing a proof test on the pair of cup members (100, 100) is provided. However, the test apparatus according to the second modification of the first embodiment is provided with the surface pressure generating member 60 having a configuration different from that of the indenter 14 that is in contact with the central peripheral region 100c without contacting the central region 100b. Is different. In addition, about the element comprised similarly to the test apparatus which concerns on the test apparatus 1 and the 2nd modification of 1st Embodiment, in FIG. 13, the same code | symbol is attached | subjected and description is omitted.

  In the test apparatus whose main part is shown in FIG. 13, a pair of outer surface side support tools (12, 12), a surface pressure generating member 60, and a load generating mechanism are provided. The pair of outer surface side support tools (12, 12) are arranged so as to support the pair of cup members (100, 100) from the outer surface side at the respective sides so that the inner surfaces 100a face each other. The surface pressure generating member 60 has a pair of contact surfaces (60a, 60a) that are in contact with the inner surface 100a of the pair of cup members (100, 100) and abuts against the inner surface 100a at the contact surface 60a. Is supposed to be generated. That is, a pair of cup members (100, 100) are arranged on both sides in the vertical direction across the surface pressure generating member 60, and a pair of outer surface side support tools (12, 100) are arranged on both sides in the vertical direction. 12) is arranged. The load generating mechanism is configured in the same manner as the urging mechanism 15, and by pressing the pair of outer surface side support tools (12, 12) in a direction in which the outer surface side support tools 12 face each other, It is provided as a mechanism for generating a biasing load from the surface pressure generating member 60 toward each inner surface 100a of the pair of cup members (100, 100).

  According to this test apparatus, a pair of outer surface side support tools (12, 12) are provided to support the pair of cup members (100, 100) from the outer surface side on each side so that the inner surfaces 100a face each other. ing. And a load generation mechanism presses a pair of outer surface side support tools (12, 12) toward the direction in which they oppose, Thereby, each inner surface of a pair of cup members (100, 100) from surface pressure generation member 60 An urging load toward 100a is generated. For this reason, in this test apparatus, it becomes possible to test a pair of cup members (100, 100) simultaneously. As described above, since two cup members (100, 100) can be tested in one test, the test efficiency can be greatly improved, and the cost and man-hour required for the test can be greatly reduced. can do. Furthermore, by using a test apparatus including a plurality of pairs of the above-described pair of outer surface side support tools (12, 12), a plurality of pairs of cup members 100 can be tested simultaneously. In this case, many cup members 100 can be tested in one test, and the test efficiency can be dramatically improved. In this test apparatus, only one load generating mechanism needs to be provided for the pair of outer surface side support tools (12, 12), and therefore, the pair of cup members (100, 100) is provided with one load. The test can be performed by the generation mechanism, and the configuration of the test apparatus can be simplified.

  FIG. 14 is a cross-sectional view illustrating a state in the vicinity of the cup member 100, illustrating a testing apparatus for a hip joint cup member according to still another embodiment. The test apparatus shown in FIG. 14 is a test apparatus for an artificial hip joint cup member for applying a surface pressure to the inner surface 100a of the cup member 100 to detect a defective cup member, which is a second embodiment. It is comprised similarly to the test apparatus which concerns on the 2nd modification. That is, a pair of outer surface side support tools (12, 12) is provided, and a configuration capable of simultaneously performing a proof test on the pair of cup members (100, 100) is provided. However, the form of contact of the pressure water with the inner surface 100a of the cup member 100 is different from the test apparatus according to the second modification of the second embodiment. In addition, about the element comprised similarly to the test apparatus which concerns on the test apparatus 2 and the 2nd modification of 2nd Embodiment, in FIG. 14, the same code | symbol is attached | subjected and description is omitted.

  In the test apparatus whose principal part is shown in FIG. 14, a pair of outer surface side supports (12, 12), a pair of seal members (61, 61), a hydraulic pressure chamber partition element 62, and a pressure water supply mechanism ( Pressure liquid supply mechanism). The pair of outer surface side support tools (12, 12) are arranged so as to be supported from the outer surface side on each side so that the inner surfaces 100a of the pair of cup members (100, 100) face each other. The pair of seal members (61, 61) are disposed so as to contact each inner surface 100a of the pair of cup members (100, 100), are formed in a ring shape having a circular cross section, and are made of resin. Yes. The hydraulic chamber compartment element 62 presses the inner surfaces 100a of the pair of cup members (100, 100) via the pair of seal members (61, 61), and a pair of hydraulic chambers (in which pressure water is introduced) ( 64, 64) are provided so as to partition between the inner surfaces 100a of the pair of cup members (100, 100). In addition, a pressure water passage (pressure liquid passage) 63 connected to the water pipe 38 is formed in the hydraulic chamber compartment element 62 so as to be bifurcated and communicate with each of the pair of hydraulic chambers (64, 64). Has been. A pressure water supply mechanism (pressure liquid supply mechanism) configured to include the pump 36 and the pressure water passage 63 supplies pressure water to the pair of hydraulic chambers (64, 64). This pressure water supply mechanism supplies pressure water to the pair of hydraulic chambers (64, 64), respectively, thereby generating surface pressure on each inner surface 100a of the pair of cup members (100, 100). Yes.

  According to this test apparatus, a pair of outer surface side support tools (12, 12) are provided to support the pair of cup members (100, 100) from the outer surface side on each side so that the inner surfaces 100a face each other. The pressure water supply mechanism respectively supplies pressure water to the pair of hydraulic chambers (64, 64) partitioned by the hydraulic chamber partition element 62 between the inner surfaces 100a of the pair of cup members (100, 100). As a result, a surface pressure is applied to each inner surface 100a of the pair of cup members (100, 100). For this reason, in this test apparatus, it becomes possible to test a pair of cup members (100, 100) simultaneously. As described above, since two cup members (100, 100) can be tested in one test, the test efficiency can be greatly improved, and the cost and man-hour required for the test can be greatly reduced. can do. Further, by using a test apparatus including a plurality of sets of the pair of outer surface side support tools (12, 12) and the hydraulic pressure chamber partition elements 62, it is possible to simultaneously test a plurality of pairs of cup members 100. . In this case, many cup members 100 can be tested in one test, and the test efficiency can be dramatically improved. In this test apparatus, since only one set of the hydraulic chamber compartment element 62 and the pressure water supply mechanism needs to be provided for the pair of outer surface side supports (12, 12), a pair of cup members ( 100, 100) can be tested with one set of the hydraulic chamber compartment element 62 and the pressure liquid supply mechanism, and the configuration of the test apparatus can be simplified.

  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, in the first and second embodiments, the shape of the outer surface support may be changed as appropriate. In the second embodiment, the pressure liquid may be other than pressure water (for example, pressure oil).

  INDUSTRIAL APPLICABILITY The present invention can be widely applied as a test device for a hip joint cup member for detecting a defective cup member by applying a surface pressure to the inner surface of a cup member used in a hip prosthesis. is there.

It is a schematic diagram explaining an artificial hip joint. It is a front view which illustrates the testing device of the cup member for artificial hip joints concerning a 1st embodiment of the present invention. It is a side view of the testing apparatus of the cup member for artificial hip joints shown in FIG. It is a block diagram of the testing apparatus of the cup member for artificial hip joints shown in FIG. It is a principal part expanded sectional view in the testing apparatus of the cup member for artificial hip joints shown in FIG. It is a principal part expanded sectional view in the testing apparatus of the cup member for artificial hip joints of the 1st modification of 1st Embodiment of this invention. It is a principal part expanded sectional view in the testing apparatus of the cup member for artificial hip joints of the 2nd modification of 1st Embodiment of this invention. It is a side view which illustrates the testing apparatus of the cup member for artificial hip joints based on 2nd Embodiment of this invention. It is a block diagram of the testing apparatus of the cup member for artificial hip joints shown in FIG. It is a principal part expanded sectional view in the testing apparatus of the cup member for artificial hip joints shown in FIG. It is a principal part expanded sectional view in the testing apparatus of the cup member for artificial hip joints of the 1st modification of 2nd Embodiment of this invention. It is a principal part expanded sectional view in the testing apparatus of the cup member for artificial hip joints of the 2nd modification of 2nd Embodiment of this invention. It is a principal part expanded sectional view in the testing apparatus of the cup member for artificial hip joints which concerns on other embodiment of this invention. It is a principal part expanded sectional view in the testing apparatus of the cup member for artificial hip joints which concerns on other embodiment of this invention. It is a figure which shows the analysis result when a surface pressure is made to act on the inner surface of a cup member as a whole (condition 1). It is a figure which shows the analysis result at the time of applying the supporting force opposite to the direction of surface pressure (condition 2). It is a figure which shows the analysis result when the surface pressure provided by the test apparatus which concerns on this embodiment is made to act (condition 3).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Test apparatus for cup member for artificial hip joint 12 Outer surface side support 13 Surface pressure generating mechanism 14 Indenter (surface pressure generating medium)
15 Biasing mechanism 100 Cup member 100a Inner surface 100b Central region 100c Center peripheral region

Claims (9)

An apparatus for testing a cup member for an artificial hip joint for detecting a defective cup member by applying a surface pressure to the inner surface of a cup member used in an artificial hip joint,
An outer surface side support that supports the cup member from the outer surface side thereof;
A surface pressure generating medium that generates a surface pressure by contacting the inner surface of the cup member is brought into contact with a central peripheral region surrounding a central region including a central portion of the inner surface to generate a surface pressure and the center. A surface pressure generating mechanism for maintaining the surface pressure generating medium in a non-contact state with respect to the region;
A test apparatus for a cup member for an artificial hip joint, comprising: A test apparatus for a cup member for an artificial hip joint according to claim 1,
The surface pressure generating mechanism is
An indenter that is the surface pressure generating medium that partitions the space adjacent to the central region without contacting the central region with respect to the inner surface of the cup member and contacts the central peripheral region;
An urging mechanism for generating an urging load from the indenter toward the inner surface of the cup member;
Have
The indenter presses the inner surface of the cup member by an urging load by the urging mechanism, thereby generating a surface pressure in the central peripheral region and maintaining a non-contact state between the indenter and the central region. An apparatus for testing a cup member for an artificial hip joint. A test apparatus for a cup member for an artificial hip joint according to claim 2,
The indenter is
A first ring-shaped curved surface portion formed in a shape along the inner surface of the cup member and in contact with the central peripheral region;
A flat portion that is surrounded by the first ring-shaped curved surface portion and is flat, and that faces the central region with a space in a state where the first ring-shaped curved surface portion is in contact with the central peripheral region. When,
An urging load acting part that is formed on the side opposite to the flat part and on which an urging load by the urging mechanism acts;
A test apparatus for a cup member for an artificial hip joint, characterized by comprising: A test apparatus for a cup member for an artificial hip joint according to claim 2,
The indenter is
A second ring-shaped curved surface portion formed in a shape along the inner surface of the cup member and abutting on the central peripheral region;
Surrounded by the second ring-shaped curved surface portion and formed so as to penetrate the indenter, the second ring-shaped curved surface portion is opposed to the central region as a space in a state where the second ring-shaped curved surface portion is in contact with the central peripheral region Through-holes,
An urging load acting portion that is formed around the through hole on the side opposite to the second ring-shaped curved surface portion and on which an urging load by the urging mechanism acts;
A test apparatus for a cup member for an artificial hip joint, characterized by comprising: A test apparatus for a cup member for an artificial hip joint according to claim 1,
The surface pressure generating mechanism is
A first seal portion that contacts the inner surface of the cup member at a position along the boundary between the central peripheral region and the central region;
A second seal portion that contacts the inner surface of the cup member at a position along the outer periphery of the central peripheral region;
A hydraulic chamber that presses the inner surface of the cup member via the first seal portion and the second seal portion and into which the pressure liquid that is the surface pressure generating medium is introduced as a space adjacent to the central peripheral region A fluid pressure chamber partition member partitioned between the inner surface of the cup member;
A pressure liquid supply mechanism for supplying pressure liquid to the hydraulic chamber;
Have
An artificial hip joint characterized in that by supplying a pressure liquid to the hydraulic pressure chamber by the pressure liquid supply mechanism, a surface pressure is generated in the central peripheral region and a non-contact state between the pressure liquid and the central region is maintained. Cup member testing equipment. A test apparatus for a cup member for an artificial hip joint according to claim 5,
The pressure liquid supply mechanism includes:
A pump for discharging pressure liquid;
A pressure liquid passage connected to the pump and passing through the inside of the hydraulic chamber partition member and communicating with the hydraulic chamber between the first seal portion and the second seal portion;
A test apparatus for a cup member for an artificial hip joint, characterized by comprising: A test apparatus for a cup member for an artificial hip joint according to claim 5 or 6,
Each of the first seal portion and the second seal portion is formed of a ring-shaped first resin seal formed of a resin material and a resin material having higher hardness than the resin material forming the first resin seal. A ring-shaped second resin seal, and the first resin seals are arranged so as to face each other via the hydraulic chamber, and the second resin seals are arranged with respect to the first resin seals. An apparatus for testing a cup member for an artificial hip joint, wherein the test apparatus is disposed adjacent to the opposite side of the hydraulic chamber. A test apparatus for a cup member for an artificial hip joint according to any one of claims 2 to 4,
A pair of the outer surface side support tools for supporting the pair of cup members from the outer surface side on the respective sides so that the inner surfaces thereof face each other,
The biasing mechanism generates a biasing load from the indenter toward each inner surface of the pair of cup members by pressing the pair of outer surface side support tools in a direction in which the outer surface side support tools face each other. A test apparatus for a cup member for an artificial hip joint, characterized by comprising: A test apparatus for a cup member for an artificial hip joint according to any one of claims 5 to 7,
A pair of the outer surface side support tools for supporting the pair of cup members from the outer surface side on the respective sides so that the inner surfaces thereof face each other,
The hydraulic chamber partitioning member partitions each of the pair of hydraulic chambers between the inner surfaces of the pair of cup members,
The test apparatus for a hip joint cup member, wherein the pressure liquid supply mechanism supplies pressure liquid to each of the pair of hydraulic chambers.

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