JP5489707B2 - Artificial joint components - Google Patents

Description

  The present invention relates to a component for an artificial joint used in an artificial joint and having a stem portion formed in a rod shape to be inserted into a medullary cavity of a bone.

  Conventionally, artificial joints such as artificial hip joints, artificial knee joints, artificial elbow joints, and artificial shoulder joints have been applied to patients with abnormalities in hip joints, knee joints, elbow joints, shoulder joints, etc. Artificial joint replacement is performed in which part or all of the above is replaced with an artificial joint. In the above-described artificial joint, a component for an artificial joint having a stem portion formed in a rod shape that is inserted into a medullary cavity portion of a bone is used (for example, see Patent Document 1).

  Patent Document 1 discloses a femoral component for an artificial hip joint used in an artificial hip joint as the above-described artificial joint component. The artificial joint component of Patent Document 1 is provided with a stem portion formed in a rod shape to be inserted into the femur on the side opposite to the joint side. In addition, the joint side of this artificial joint component is connected to a bone head ball member that is disposed on the acetabulum side of the pelvis and formed in a ball shape.

  In the artificial joint replacement, an artificial joint component having an appropriate length and shape of the stem portion is selected and used by an operator according to the condition of a patient to which the artificial joint is applied. In Patent Document 1, a component for an artificial joint having a relatively long stem portion is disclosed. However, for a patient who does not need a stem portion having a long length, a stem portion is disclosed. An artificial joint component having a short part length is used.

Japanese National Patent Publication No. 8-503859

  After the artificial joint replacement as described above, as a case that occurs in a patient in which a component for an artificial joint having a stem portion is implanted, in the vicinity of the end portion of the stem portion opposite to the joint side In some cases, bone fractures occur when the stem is inserted into the medullary cavity. When such a fracture occurs, conventionally, a surgical operation for replacing a component for an artificial joint having a stem portion or a plate-like member is brought into contact with a side surface of a bone into which the stem portion is inserted to connect the fracture portion. Surgery is usually performed.

When replacement of the artificial joint component is performed, the already implanted artificial joint component should be replaced with an artificial joint component having a stem portion having an appropriate length according to the condition of the fractured portion. become. In this case, it is necessary to take out the stem portion of the already prosthetic component from the medullary cavity and remove the prosthetic component. For this reason, in the operation of replacing the artificial joint component, in addition to the need for the opening (incision) in the vicinity of the fractured part for the fixation of the fractured part, in order to remove the artificial joint component Retraction in the vicinity of the joint is also required. This will lead to an enlargement of the wound part, which increases the burden on the patient and the operator and may increase the risk of occurrence of infectious diseases. Further, in order to remove the component for an artificial joint, it is necessary to destroy the bone at a portion other than the fracture portion, which further increases the burden on the patient and the operator. In addition, there is a concern that the risk of further infectious diseases occurring due to the replacement of the artificial joint component is increased.

  On the other hand, when a fractured part is joined using a plate-like member, the fractured part is joined by the already-arranged artificial joint component and the newly installed plate-like member. In this case, the plate-like member to be installed is arranged on both sides of the fractured portion along the longitudinal direction of the bone, and is further arranged to extend over the joint side substantially parallel to the artificial joint component. In addition, it is installed so as to connect the fractured parts in cooperation with the already prosthetic component. Therefore, in the case of an operation in which such a plate-shaped member is installed and the fracture portions are joined together, a treatment for greatly opening from the vicinity of the fracture portion to the joint side is necessary. This will lead to an enlargement of the wound part, which increases the burden on the patient and the operator and may increase the risk of occurrence of infectious diseases.

  In view of the above circumstances, the present invention can suppress the enlargement of the retracted portion when a fracture occurs in a patient who has already undergone artificial joint replacement, and reduces the burden on the patient and the operator. An object of the present invention is to provide a component for an artificial joint that can reduce the risk of developing an infection.

In order to achieve the above object, a component for an artificial joint according to an aspect of the present invention relates to a component for an artificial joint that is used in an artificial joint and has a stem portion formed in a rod shape to be inserted into a medullary cavity of a bone. The component for an artificial joint according to an aspect of the present invention is already provided on the joint side of the bone as a component of the artificial joint by the artificial joint replacement performed during the operation performed when the bone is fractured. A connecting portion that is connected to another component that is disposed; and the stem portion that is inserted into the medullary cavity portion of the bone on a side opposite to the joint side via the fracture portion of the bone; The connecting portion is fixedly connected to the other component at an end of the other component opposite to the joint side, and the stem portion is connected to the other portion with respect to the other portion. It is formed integrally or fixed on the side opposite to the side fixed to the component.

  According to the present invention, when a bone fracture occurs in a patient who has already undergone artificial joint replacement, the stem portion of the artificial joint component is first placed on the opposite side of the joint side via the fracture portion. Is inserted into the medullary cavity. And the connection part integrally formed or fixed to the stem part is opposite to the stem part side, with respect to the end part opposite to the joint side of the other components already arranged on the joint side of the bone. Connected to be fixed. Thereby, it fixes in the state extended toward the other side and the other side of the component already arrange | positioned, and the component for artificial joints is installed. For this reason, the treatment fixed so that a fracture part may be joined will be performed appropriately.

  And according to the present invention, there is no need to provide a retracting part that greatly opens from the vicinity of the fracture part to the joint side, and it is only necessary to provide the retracting part in the vicinity of the fracture part. Surgery can be performed. Further, since an operation for replacing other components with a component having a long stem portion is not performed, it is also possible to prevent the retracted portion from being expanded over a plurality of locations. Therefore, the expansion of the wound part can be suppressed, the burden on the patient and the operator can be reduced, and the risk of occurrence of infectious diseases can be reduced. According to the present invention, since it is not necessary to remove other components, it is not necessary to destroy the bone at a place other than the fractured portion, and in addition, it is not necessary to replace other components. Can further reduce the risk of occurrence.

Therefore, according to the present invention, when a fracture occurs in a patient who has already undergone artificial joint replacement and surgery is performed, the spread of the wound can be suppressed, and the burden on the patient and the operator can be reduced. It is possible to provide a component for an artificial joint that can reduce the risk of occurrence of the joint.

Artificial joints for components according to an aspect of the present invention, prior Symbol connecting portion and said stem portion is preferably entirely disposed within the medullary cavity.

  According to the present invention, the entire connection portion and stem portion are disposed in the medullary cavity of the fractured bone. For this reason, the space in the medullary cavity portion of the bone can be utilized to efficiently arrange the connecting portion and the stem portion for fixing the fracture portion, and the burden on the patient can be further reduced. In addition, since the connecting part and the stem part are in close contact with the bone from the inside of the medullary cavity part and serve as a mandrel to fix the fracture part, the fracture part can be fixed more stably and firmly, A structure that facilitates reduction of the fractured part can be realized.

Artificial joints for components according to an aspect of the present invention, prior Symbol connecting portion, in the bone, it is preferably arranged so as to be replaced with part of the bone.

  According to this invention, it arrange | positions so that a connection part may replace a part of bone. For this reason, the bone can be stably and firmly fixed by the connecting portion replaced with a part of the bone.

Artificial joints for components according to an aspect of the present invention is arranged along the longitudinal direction of the bone over both sides of the fracture portion in the longitudinal direction before Symbol bone, it is fixed to the outer periphery of the bone It is preferable that a fixing member is further provided.

  According to this invention, the fixing member installed in the outer periphery of a bone is further provided over the both sides of a fracture part. For this reason, in addition to fixing by the connecting portion and the stem portion installed so as to be extended with respect to other components, the fracture portion is also fixed by the fixing member so that the fracture portion is reinforced. Can be fixed. In addition, this makes it possible to realize a structure that facilitates reduction of the fractured portion if the connecting portion is not in the form of being replaced with a part of the bone. Unlike the conventional case where the fractured parts are joined using a plate-like member, this fixing member is provided as a reinforcing member in addition to the connecting portion and the stem portion, so it is configured as a small member. Is done. For this reason, the size of the retracted portion in the vicinity of the fracture portion can be sufficiently reduced.

Artificial joints for components according to an aspect of the present invention, at least one of the previous SL connecting portion and said stem portion, rotation regulating portion for regulating the direction of displacement of rotation within the medullary cavity of the stem portion Is preferably provided.

  According to this invention, the rotation restricting portion is provided in at least one of the connecting portion and the stem portion. As a result, the stem portion is restrained from being displaced in the rotation direction within the medullary cavity portion and maintained in a stable posture. For this reason, a fracture part can be fixed more stably and firmly. In addition, this makes it possible to realize a structure that facilitates reduction of the fractured portion if the connecting portion is not in the form of being replaced with a part of the bone.

Artificial joints for components according to an aspect of the present invention, the pre-Symbol rotation restricting portion, it is engaged with the bone, is possible to restrict the rotation direction of the displacement in said medullary cavity of the stem portion Is preferred .

  According to this invention, since the rotation restricting portion engages with the bone, the connecting portion and the stem portion can be more firmly fixed to the bone, and the fracture portion can be more stably and firmly fixed.

Artificial joints for components according to an aspect of the present invention, the pre-Symbol rotation restricting portion, it is engaged with the other components, regulates the rotation direction of the displacement in the medullary cavity of the stem portion It is preferable .

  According to this invention, since the rotation restricting portion engages with other components, the connecting portion and the stem portion can be more firmly fixed with respect to the other components, and the fracture portion can be more stably and firmly fixed. Can be fixed.

Artificial joints for components according to an aspect of the present invention, the the previous SL connecting portion and the stem portion is provided as a separate member, wherein the plurality of different sizes a fixable to replace to the connecting portion A stem portion is preferably provided .

  According to this invention, the stem portion is provided as a plurality of replaceable members that are different from the connecting portion and have different sizes. For this reason, when applying as a component for artificial joints at the time of an operation, the optimal one according to a patient's condition can be appropriately selected from a plurality of stem portions having different sizes. Therefore, by preparing multiple stem parts with size variations at the time of surgery, it is more efficient for artificial joints with many sizes and configurations than when preparing multiple artificial joint components. Components can be built. In addition, since the connecting part that can be fixed to the other component corresponding to the shape of the other component and the stem part having the size variation can be individually manufactured, it becomes easier to manufacture the artificial joint component, Manufacturing efficiency can be improved.

Artificial joints for components according to an aspect of the present invention, prior Symbol connecting portion, with respect to the other components, it is preferably fixed via the fitting or screw connection.

  According to the present invention, since the connecting portion is fixed to the other component by fitting or screw connection, it is possible to realize a structure that firmly fixes the connecting portion and the other component with a simple mechanism. In addition, since the connecting portion can be fixed to another component by a fitting operation or a screwing operation, the fixing operation between the connecting portion and the other component during surgery is facilitated.

  According to the present invention, when a fracture occurs in a patient who has already undergone artificial joint replacement, surgery can be suppressed, and the spread of the wound can be suppressed, and the burden on the patient and the operator can be reduced. It is possible to provide a component for an artificial joint that can reduce the risk.

It is sectional drawing which shows typically the state by which the component for artificial joints concerning 1st Embodiment of this invention was applied with respect to the femur. It is a front view which shows the other component already arrange | positioned at the joint side in the femur shown in FIG. It is a front view of the component for artificial joints shown in FIG. It is sectional drawing which shows typically the state which the fracture generate | occur | produced in the femur in which the other component is already arrange | positioned. It is a front view which shows the modification of the component for artificial joints shown in FIG. It is sectional drawing which shows typically the state by which the component for artificial joints concerning 2nd Embodiment of this invention was applied with respect to the femur. It is sectional drawing which shows typically the state by which the component for artificial joints concerning 3rd Embodiment of this invention was applied with respect to the femur. It is a front view of the component for artificial joints shown in FIG. It is the partially expanded view seen from the arrow B direction in a figure about the femur shown in FIG. 7, another component, and the component for artificial joints. It is sectional drawing which shows typically the state by which the component for artificial joints concerning 4th Embodiment of this invention was applied with respect to the femur. It is a front view of the component for artificial joints shown in FIG. It is sectional drawing which shows typically the state by which the component for artificial joints concerning 5th Embodiment of this invention was applied with respect to the femur. It is a front view of the component for artificial joints shown in FIG. It is the partially expanded view seen from the arrow C direction in the figure about the femur shown in FIG. 12, another component, and the component for artificial joints. It is sectional drawing which shows typically the state by which the component for artificial joints concerning 6th Embodiment of this invention was applied with respect to the femur. It is a front view of the component for artificial joints shown in FIG. It is sectional drawing which shows typically the state by which the component for artificial joints concerning 7th Embodiment of this invention was applied with respect to the femur. It is a front view of the component for artificial joints shown in FIG. It is sectional drawing which shows typically the state which the fracture generate | occur | produced in the femur in which the other component is already arrange | positioned. It is a figure for demonstrating the resection treatment of the femur performed in order to apply the component for artificial joints shown in FIG. It is sectional drawing which shows typically the state by which the component for artificial joints concerning 8th Embodiment of this invention was applied with respect to the femur. It is a front view of the component for artificial joints shown in FIG. It is the partially expanded view seen from the arrow D direction in a figure about the femur shown in FIG. 21, another component, and the component for artificial joints. It is sectional drawing which shows typically the state by which the component for artificial joints concerning 9th Embodiment of this invention was applied with respect to the femur. It is sectional drawing of the component for artificial joints shown in FIG.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the following description, an artificial joint component used as a femoral component for an artificial hip joint will be described as an example. However, the present invention is not limited to this example, and the present invention can be applied. That is, the present invention is widely used as a component for an artificial joint having a stem portion formed in a rod shape that is used in an artificial joint and inserted into a medullary cavity of a bone.

(First embodiment)
FIG. 1 is a cross-sectional view schematically illustrating a state in which the artificial joint component 1 according to the first embodiment of the present invention is applied to the femur 100, omitting the illustration of living tissue other than the femur 100. It is. In FIG. 1, the artificial joint component 1 and the femur 100 are partially cut away.

In a patient who has already undergone artificial joint replacement for replacing the joint with an artificial joint, an artificial joint is inserted during a surgery performed when the bone (in this embodiment, the femur 100) in which the artificial joint is installed is broken. The joint component 1 is used. In the present embodiment, an example in which an artificial hip joint replacement has already been performed and the existing femoral component 101 that is another component in the present embodiment has already been arranged will be described. That is, in the operation performed when the femur 100 is fractured, the existing femoral component 101 is already placed on the joint side of the femur 100 as a component of the artificial hip joint by the already performed hip replacement. Will be. Further, in the present embodiment, as shown in FIG. 1, an example in which the femur 100 is fractured in the fracture portion 100b will be described.

  FIG. 2 is a front view of the existing femoral component 101. An existing femoral component 101 placed on the femur 100 by an already performed hip replacement is provided with an existing stem portion 101a and a neck portion 101b. The existing stem portion 101 a is inserted into the medullary cavity portion 100 a of the femur 100. The end portion 101c on the distal end side of the existing stem portion 101a is formed as a tapered side surface whose peripheral side surface forms a part of a conical curved surface and is gently inclined. The neck portion 101b is provided as an end portion opposite to the end portion 101c, and is connected to a bone head ball member 102 that is disposed on the acetabulum side of the pelvis (not shown) and formed in a ball shape. As the existing femoral component 101, a femoral component having a relatively short stem portion 101a is illustrated. Further, as the existing femoral component 101, an example is shown in which the end 101c is formed to extend through a stepped diameter portion on the distal end side of the existing stem portion 101a.

  FIG. 3 is a front view showing the component 1 for artificial joints, and is a diagram showing a partially cut section. As shown in FIGS. 1 and 3, the artificial joint component 1 includes a connecting portion 11 and a stem portion 12. In addition, the component 1 for artificial joints is formed with metals, such as a titanium alloy, a cobalt chromium alloy, and stainless steel which obtained the approval approval as a medical device for living body implantation.

  The connecting portion 11 is provided as an end portion on the joint side of the artificial joint component 1 (the side on which the existing femoral component 101 is disposed and indicated by the arrow A in FIG. 3), and is connected to the existing femoral component 101. It is comprised as a part connected with respect to. The connecting portion 11 is formed with a connecting hole 11 a that opens toward the joint side and is recessed in the longitudinal direction of the artificial joint component 1.

  The connecting hole 11a of the connecting part 11 is formed so that the end 101c of the existing stem part 101a in the existing femoral component 101 can be inserted and fitted. Thereby, the connection part 11 is comprised so that it may be fixed and connected with respect to this existing femoral component 101 at the edge part 101c on the opposite side to the joint side in the existing femoral component 101 through fitting. . The inner peripheral surface of the coupling hole 11a corresponds to the tapered side surface of the end portion 101c, and is formed as a tapered inner peripheral surface that forms a part of a conical curved surface and is inclined so as to be gently constricted. ing.

  The stem portion 12 is provided on the side opposite to the connecting portion 11 in the longitudinal direction of the prosthetic joint component 1, is formed in a columnar rod shape inserted into the medullary cavity portion 100 a of the femur 100 and has a hemispherical tip side. It is provided as a formed part. Accordingly, the stem portion 12 is configured to be inserted into the medullary cavity portion 100a of the femur 100 on the opposite side to the joint side via the fracture portion 100b of the femur 100. The stem portion 12 is formed integrally with the connecting portion 11 on the side opposite to the side fixed to the existing femoral component 101.

Moreover, as shown in FIG. 1, in the component 1 for artificial joints, said connection part 11 is mentioned.
The stem portion 12 is configured so as to be disposed in the medullary cavity portion 100a of the femur 100 as a whole.

  Next, an operation in which the above-described artificial joint component 1 is applied when the femur 100 on which the existing femoral component 101 is arranged in a patient who has already undergone artificial joint replacement will be described. FIG. 4 omits illustration of living tissue other than the femur 100 in a state where a fracture has occurred in the vicinity of the end 101c of the existing stem portion 101a in the femur 100 in which the existing femoral component 101 is already arranged. FIG. In FIG. 4, the femur 100 is shown with a partially cutaway cross section, and the femur 100 is illustrated as being broken at the fracture portion 100b.

  When a fracture as shown in FIG. 4 occurs, the component 1 for artificial joint is applied, and an operation for fixing the fracture portion 100b is performed. In this case, first, the surgeon performs a treatment for opening the vicinity of the fracture portion 100b. At this time, a retractable portion (not shown) having a size enough to allow the artificial joint component 1 to be inserted from the end portion of the stem portion 12 (the end portion opposite to the connecting portion 11) is formed. After the formation of the retracted portion, the stem portion 12 is inserted into the medullary cavity portion 100a of the femur 100 from the end portion side through the retracted portion. Then, the stem portion 12 is further inserted into the inner side of the medullary cavity portion 100a opposite to the joint side via the fracture portion 101b of the femur 100, and the connecting portion 11 is also inserted into the medullary cavity portion 100a.

  As described above, when the stem portion 12 and the connecting portion 11 are inserted into the medullary cavity portion 100a, the end portion 101c of the existing femoral component 101 already arranged on the joint side in the femur 100, and the connecting portion 11 connecting holes 11a are fitted. Thereby, the connection part 11 and the existing femoral component 101 are fixed and connected. The artificial joint component 1 is fixed in the medullary cavity 100a by using bone cement or by press-fitting the femur 100. After the fixing operation of the artificial joint component 1 and the existing femoral component 101 by the above fitting is completed, a post-treatment for the fracture portion 100b is appropriately performed, and a treatment for fixing the fracture portion 100b to be joined is performed. Will be completed.

  According to the artificial joint component 1 described above, when a fracture occurs in a patient who has already undergone artificial joint replacement, the stem portion 12 of the artificial joint component 1 first moves toward the joint side. Then, it is inserted into the medullary cavity 100a on the opposite side through the fracture portion 100b. And the connection part 11 integrally formed with respect to the stem part 12 is on the opposite side to the joint side of the existing femoral component 101 already arranged on the joint side of the femur 100 on the opposite side to the stem part 12 side. Connected to be fixed to the end. As a result, the artificial joint component 1 is installed while being fixed to the already-exposed femoral component 101 that has been extended toward the side opposite to the joint side. For this reason, the treatment fixed so that the fracture part 100b may be joined will be performed appropriately.

  And according to the component 1 for artificial joints, it is not necessary to provide a retracting part that opens greatly from the vicinity of the fractured part 100b to the joint side, and it is only necessary to provide a retracted part in the vicinity of the fractured part 100b. Surgery can be performed while suppressing the expansion of the wound. In addition, since an operation for replacing the existing femoral component 101 with a component having a long stem portion is not performed, it is possible to prevent the retracted portion from being enlarged over a plurality of locations. Therefore, the expansion of the wound part can be suppressed, the burden on the patient and the operator can be reduced, and the risk of occurrence of infectious diseases can be reduced. According to the artificial joint component 1, it is not necessary to remove the existing femoral component 101, so there is no need to destroy the femur 100 at a place other than the fracture portion 100 b, and in addition, the existing femoral component 101 Since it is not necessary to exchange, the risk of infectious diseases can be further reduced.

  Therefore, according to the component 1 for artificial joints, when a fracture occurs in a patient who has already undergone artificial joint replacement and surgery is performed, it is possible to suppress the enlargement of the retracted portion and reduce the burden on the patient and the operator. At the same time, the risk of infectious diseases can be reduced.

  Further, according to the artificial joint component 1, the entire connecting portion 11 and the stem portion 12 are disposed in the medullary cavity portion 100 a of the fractured femur 100. For this reason, the space in the medullary cavity portion 100a of the femur 100 can be utilized, and the connecting portion 11 and the stem portion 12 for fixing the fracture portion 100b can be arranged in a space-efficient manner, further reducing the burden on the patient. can do. In addition, since the connecting portion 11 and the stem portion 12 are in close contact with the femur 100 from the inside of the medullary cavity portion 100a and serve as a mandrel, the fracture portion 100b is fixed, thereby further stabilizing the fracture portion 100b. Thus, it is possible to realize a structure that can be firmly fixed and that facilitates reduction of the fracture portion 100b.

  According to the artificial joint component 1, since the connecting portion 11 is fixed to the existing femoral component 101 by fitting, a structure that firmly fixes the connecting portion 11 and the existing femoral component 101 with a simple mechanism is realized. Can do. In addition, since the connecting portion 11 can be fixed to the existing femoral component 101 by the fitting operation, the fixing operation between the connecting portion 11 and the existing femoral component 101 during surgery is facilitated.

  In the above-described embodiment, the connection hole 11a is formed in the connection portion 11 and is fitted to the end portion 101c of the existing femoral component 101. However, this need not be the case. If the existing femoral component 101 in which the male screw portion is formed at the end portion 101c is already arranged, the connection in which the female screw portion that is screwed with the end portion 101c is formed on the inner periphery of the connection hole 11a. The component for artificial joints having the part 11 is used. In the case of the artificial joint component according to this modification, the connecting portion 11 is fixed to the existing femoral component 101 via screw connection. Also in this case, as in the case of the form fixed by fitting, a structure for firmly fixing the connecting portion 11 and the existing femoral component 101 with a simple mechanism can be realized. Fixing work with the existing femoral component 101 is facilitated.

  Further, as shown in FIG. 5, if the hole 101 d that is recessed is provided in the end portion 101 c, the artificial joint component 1 a according to the modified example is used. In the artificial joint component 1a, the connecting portion 13 connected to the existing femoral component 101 is provided as a protruding portion that is fitted and fixed in the hole 101d of the end portion 101c. And the stem part 14 comprised similarly to the stem part 12 of the component 1 for artificial joints and formed in the column-shaped rod shape is integrally formed with the connection part 13. As shown in FIG. Also in the artificial joint component 1 according to this modification, the same effects as the artificial joint component 1 can be obtained.

  In the above-described embodiment, the artificial joint component 1 in which the connecting portion 11 and the stem portion 12 are integrally formed has been described as an example. However, this need not be the case. The joint part 11 and the stem part 12 are provided as separate members, and the stem part 12 is an artificial joint component fixed on the side opposite to the side fixed to the existing femoral component 101 with respect to the connection part 11. You may implement.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 6 is a cross-sectional view schematically showing a state in which the artificial joint component 2 according to the second embodiment of the present invention is applied to the femur 100, omitting the illustration of living tissue other than the femur 100. It is. In FIG. 6,
The artificial joint component 2 and the femur 100 are shown in a partially cutaway cross section.

  In a patient who has already undergone artificial joint replacement for replacing the joint with an artificial joint, an artificial joint is inserted during a surgery performed when the bone (in this embodiment, the femur 100) in which the artificial joint is installed is broken. The joint component 2 is used. In the present embodiment, as in the first embodiment, an example in which hip replacement has already been performed and the existing femoral component 101, which is another component in the present embodiment, has already been placed will be described. .

  The artificial joint component 2 shown in FIG. 6 includes a connecting portion 11 and a stem portion 12 configured in the same manner as the artificial joint component 1 of the first embodiment, and further includes a fixing member 15. . Hereinafter, about the structure similar to 1st Embodiment, description is abbreviate | omitted by attaching | subjecting the same code | symbol in drawing, or quoting the same code | symbol, and demonstrates a structure different from 1st Embodiment.

  As described above, the artificial joint component 2 is a plate-shaped fixing member in addition to the member corresponding to the artificial joint component 1 of the first embodiment in which the connecting portion 11 and the stem portion 12 are integrally formed. 15 is provided. The artificial joint component 2 is formed of a metal such as a titanium alloy, a cobalt chromium alloy, or stainless steel that has been approved for medical use as a medical device.

  The fixing member 15 is disposed along the longitudinal direction of the femur 100 over both sides of the fracture portion 100b in the longitudinal direction of the femur 100 and is fixed to the outer periphery of the femur 100 by a plurality of wires 16. It is provided as a member.

  In the case of an operation performed when the femur 100 is fractured, first, similarly to the first embodiment, the connecting portion 11 and the stem portion 12 are arranged in the medullary cavity portion 100a, and the connecting portion 11 and the existing femur are arranged. The bone component 101 is fixed. And after the post-treatment with respect to the fracture part 100b is performed, the fixing member 15 is inserted from the same retracted part as the retracted part into which the connecting part 11 and the stem part 12 are inserted, and is disposed at a position corresponding to the fracture part 100b. . Thereafter, the plurality of wires 16 are fixed to the outer periphery of the femur 100 so that the fixing member 15 is pressed against the side surface of the femur 100 and fixed. Thereby, the treatment fixed so that the fracture part 100b is joined is completed.

  According to the artificial joint component 2 described above, the same effects as those of the first embodiment can be obtained. That is, according to the artificial joint component 2, when a fracture occurs in a patient who has already undergone artificial joint replacement and surgery is performed, it is possible to suppress the enlargement of the retracted portion and reduce the burden on the patient and the operator. At the same time, the risk of infectious diseases can be reduced.

  And according to the component 2 for artificial joints, the fixing member 15 installed in the outer periphery of the femur 100 over the both sides of the fracture part 100b is further provided. For this reason, in addition to fixing by the connecting portion 11 and the stem portion 12 installed so as to be extended with respect to the existing femoral component 101, the fracture member 100b is also fixed by the fixing member 15 so as to be reinforced. The fracture portion 100b can be more firmly fixed, and a structure that facilitates reduction of the fracture portion 100b can be realized. Unlike the conventional case where the fractured parts are joined using a plate-like member, the fixing member 15 is provided as a reinforcing member in addition to the connecting portion 11 and the stem portion 12, so that the small size can be reduced. Configured as a member. For this reason, the size of the retracted part in the vicinity of the fractured part 100b can be sufficiently reduced.

(Third embodiment)
Next, a third embodiment of the present invention will be described. FIG. 7 is a cross-sectional view schematically showing a state in which the artificial joint component 3 according to the third embodiment of the present invention is applied to the femur 100, omitting the illustration of the living tissue other than the femur 100. It is. In FIG. 7, the artificial joint component 3 and the femur 100 are partially cut away.

  In a patient who has already undergone artificial joint replacement for replacing the joint with an artificial joint, an artificial joint is inserted during a surgery performed when the bone (in this embodiment, the femur 100) in which the artificial joint is installed is broken. The joint component 3 is used. In the present embodiment, as in the first embodiment, an example in which hip replacement has already been performed and the existing femoral component 101, which is another component in the present embodiment, has already been placed will be described. .

  The artificial joint component 3 shown in FIG. 7 includes a connecting portion 11 and a stem portion 12 configured in the same manner as the artificial joint component 1 of the first embodiment. However, in the connection part 11, the structure is different from 1st Embodiment in the point in which the rotation control part 17 is further provided. Hereinafter, about the structure similar to 1st Embodiment, description is abbreviate | omitted by attaching | subjecting the same code | symbol in drawing, or quoting the same code | symbol, and demonstrates a structure different from 1st Embodiment.

  FIG. 8 is a front view showing the component 3 for artificial joints, and is a diagram showing a partially cut section. 9 is a partially enlarged view of the femur 100, the existing femoral component 101, and the artificial joint component 3 shown in FIG. 7 as seen from the direction of arrow B in the drawing. In the artificial joint component 3, the connecting portion 11 and the stem portion 12 are integrally formed, and the rotation restricting portion 17 is provided in the connecting portion 11. The artificial joint component 3 is made of a metal such as titanium alloy, cobalt chromium alloy, stainless steel, or the like that has been approved as a medical device for living body implantation.

  As shown in FIGS. 7 to 9, the rotation restricting portion 17 is formed in a fin shape protruding outward on the outer periphery of the connecting portion 11. And the rotation control part 17 is provided in the position along the diameter direction of the component 3 for artificial joints formed in the column shape while extending along the longitudinal direction of the component 3 for artificial joints. Thus, the rotation restricting portion 17 is provided as a convex portion protruding outward in the connecting portion 11 and is configured to engage the femur 100 from the inside of the medullary cavity portion 100a. Thereby, the rotation restricting portion 17 is configured to restrict the displacement in the direction of rotation in the medullary cavity portion 100 a of the stem portion 12 formed integrally with the connecting portion 11.

  In the case of surgery performed when the femur 100 is fractured, the artificial joint component 3 is used in the same manner as in the first embodiment. However, when the stem portion 12 and the connecting portion 11 are inserted into the medullary cavity portion 100a, the rotation restricting portion 17 is engaged with the femur 100 from the inside as described above.

  According to the artificial joint component 3 described above, the same effects as those of the first embodiment can be obtained. That is, according to the artificial joint component 3, when a fracture has occurred in a patient who has already undergone artificial joint replacement and surgery is performed, the spread of the wound can be suppressed, and the burden on the patient and the operator can be reduced. At the same time, the risk of infectious diseases can be reduced.

And according to the component 3 for artificial joints, the rotation control part 17 is provided in the connection part 11. FIG. As a result, the stem portion 12 is maintained in a stable posture by restricting the displacement in the rotation direction within the medullary cavity portion 100a. For this reason, the fracture portion 100b can be more stably and firmly fixed, and a structure that facilitates reduction of the fracture portion 100b can be realized. Further, since the rotation restricting portion 17 engages with the femur 100, the connecting portion 11 and the stem portion 12 can be more firmly fixed to the femur 100, and the fracture portion 100b can be more stably and firmly fixed. It is possible to realize a structure that can be easily fixed and can further promote reduction of the fractured portion 100b.

  In the above embodiment, an example in which the rotation restriction portion 17 formed in a fin shape is provided in the connecting portion 11 has been described as an example, but this need not be the case. The rotation restricting portion may be provided not on the connecting portion 11 but on the stem portion 12, and the line restricting portion may be provided so as to extend from the connecting portion 11 to the stem portion 12. Moreover, the rotation control part of shapes other than a fin shape may be provided.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. FIG. 10 is a cross-sectional view schematically showing a state in which the artificial joint component 4 according to the fourth embodiment of the present invention is applied to the femur 100, omitting the illustration of living tissue other than the femur 100. It is. In FIG. 10, the artificial joint component 4 and the femur 100 are partially cut away.

  In a patient who has already undergone artificial joint replacement for replacing the joint with an artificial joint, an artificial joint is inserted during a surgery performed when the bone (in this embodiment, the femur 100) in which the artificial joint is installed is broken. The joint component 4 is used. In the present embodiment, as in the first embodiment, an example in which hip replacement has already been performed and the existing femoral component 101, which is another component in the present embodiment, has already been placed will be described. .

  The artificial joint component 4 shown in FIG. 10 includes a connecting portion 11 and a stem portion 12 configured in the same manner as the artificial joint component 1 of the first embodiment. However, the connection part 11 is different from the first embodiment in that a rotation restricting part is further provided. Hereinafter, about the structure similar to 1st Embodiment, description is abbreviate | omitted by attaching | subjecting the same code | symbol in drawing, or quoting the same code | symbol, and demonstrates a structure different from 1st Embodiment.

  FIG. 11 is a front view showing the component 4 for artificial joints, and is a diagram showing a partially cut section. In the artificial joint component 4, the connecting portion 11 and the stem portion 12 are integrally formed, and the connecting portion 11 is provided with a rotation restricting portion configured to include a screw plate portion 18 and a plurality of screws 19. ing. The artificial joint component 4 is made of a metal such as titanium alloy, cobalt chromium alloy, stainless steel, or the like that has been approved as a medical device for living body implantation.

  As shown in FIGS. 10 and 11, the screw plate portion 18 includes a protruding portion 18 a that protrudes outward from the end portion of the connecting portion 11, and the connecting portion 11 and A plate portion 18b formed in a plate shape extending toward the stem portion 12 side substantially parallel to the stem portion 12 is provided. The protruding portion 18a, the plate portion 18b, and the connecting portion 11 are integrally formed. The plate portion 18b has a plurality of through holes through which the screws 19 are inserted. In the state where the connecting portion 11 and the stem portion 12 are disposed in the medullary cavity portion 100a, the plate portion 18b is arranged along the longitudinal direction of the femur 100 on which the connecting portion 11 and the stem portion 12 are disposed. It arrange | positions so that it may contact | abut to the side surface of 100.

Each screw 19 is provided as a male screw member that passes through the through hole formed in the plate portion 18 b and also passes through the through hole formed in the stem portion 12. The screw 19 is attached in a state where the connecting portion 11 and the stem portion 12 are disposed in the medullary cavity portion 100 a and the plate portion 18 b is in contact with the side surface of the femur 100. At this time, each screw 19 is inserted into each through hole in the plate portion 18 b, passes through each through hole in the stem portion 12, and is attached in a state of being screwed to the femur 100. The head of each screw 19 is locked with the plate portion 18b.

  As described above, the rotation restricting portion includes the screw plate portion 18 formed integrally with the connecting portion 11 and the plurality of screws 19 that engage with the screw plate portion 18 and the femur 100. ing. Accordingly, the rotation restricting portions (18, 19) are configured to restrict the displacement in the direction of rotation in the medullary cavity portion 100a of the stem portion 12 formed integrally with the connecting portion 11.

  In the case of an operation performed when the femur 100 is fractured, first, similarly to the first embodiment, the connecting portion 11 and the stem portion 12 are arranged in the medullary cavity portion 100a, and the connecting portion 11 and the existing femur are arranged. The bone component 101 is fixed. At this time, the protruding portion 18a of the fracture portion 100b protrudes outward from the femur 100, and the plate portion 18b is disposed so as to contact the side surface of the femur 100. And each screw | thread 19 is inserted from the same retracted part as the retracted part in which the connection part 11 and the stem part 12 were inserted. Further, each screw 19 is inserted into each through hole in the plate portion 18 b, passes through each through hole in the stem portion 12, and is attached and fixed in a state of being screwed to the femur 100. Thereby, the treatment fixed so that the fracture part 100b is joined is completed.

  According to the artificial joint component 4 described above, the same effects as those of the first embodiment can be obtained. That is, according to the artificial joint component 4, when a fracture occurs in a patient who has already undergone artificial joint replacement and surgery is performed, it is possible to suppress the enlargement of the retracted portion and reduce the burden on the patient and the operator. At the same time, the risk of infectious diseases can be reduced.

  Then, according to the artificial joint component 4, the rotation restricting portion configured to include the screw plate 18 and the plurality of screws 19 is provided. As a result, the stem portion 12 is maintained in a stable posture by restricting the displacement in the rotation direction within the medullary cavity portion 100a. For this reason, the fracture portion 100b can be more stably and firmly fixed, and a structure that facilitates reduction of the fracture portion 100b can be realized. In addition, since the rotation restricting portion engages with the femur 100, the connecting portion 11 and the stem portion 12 can be more firmly fixed to the femur 100, and the fracture portion 100b can be more stably and firmly fixed. A structure that can be fixed and facilitates further reduction of the fracture portion 100b can be realized.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described. FIG. 12 is a cross-sectional view schematically showing a state in which the artificial joint component 5 according to the fifth embodiment of the present invention is applied to the femur 100 while omitting the illustration of a living tissue other than the femur 100. It is. In FIG. 12, the artificial joint component 5 and the femur 100 are partially cut away.

  In a patient who has already undergone artificial joint replacement for replacing the joint with an artificial joint, an artificial joint is inserted during a surgery performed when the bone (in this embodiment, the femur 100) in which the artificial joint is installed is broken. The joint component 5 is used. In the present embodiment, as in the first embodiment, an example in which hip replacement has already been performed and the existing femoral component 101, which is another component in the present embodiment, has already been placed will be described. .

  The artificial joint component 5 shown in FIG. 12 includes a connecting portion 11 and a stem portion 12 configured in the same manner as the artificial joint component 1 of the first embodiment. However, in the connection part 11, the structure differs from 1st Embodiment in the point in which the rotation control part 20 is further provided. Hereinafter, about the structure similar to 1st Embodiment, description is abbreviate | omitted by attaching | subjecting the same code | symbol in drawing, or quoting the same code | symbol, and demonstrates a structure different from 1st Embodiment.

  FIG. 13 is a front view showing the component 5 for artificial joints, and is a diagram showing a partially cut section. 14 is a partially enlarged view of the femur 100, the existing femoral component 101, and the artificial joint component 5 shown in FIG. 12 as seen from the direction of arrow C in the drawing. In the artificial joint component 5, the connecting portion 11 and the stem portion 12 are integrally formed, and the rotation restricting portion 20 is provided in the connecting portion 11. The artificial joint component 5 is made of a metal such as a titanium alloy, a cobalt chrome alloy, or stainless steel that has been approved for medical use as a medical device.

  As shown in FIGS. 12 to 14, the rotation restricting portion 20 is a convex portion that protrudes toward the existing femoral component 101 side (joint side) at the end fixed to the existing femoral component 101 in the connecting portion 11. Is formed. And the rotation control part 20 is provided in a pair in the position along the diameter direction of the component 5 for artificial joints formed in the column shape.

  In the existing femoral component 101 to which the artificial joint component 5 is coupled, the end 101c is formed to extend through a stepped diameter portion on the distal end side of the existing stem 101a. A recessed portion 101e formed in a recessed portion is provided in the step-shaped portion. When such a concave portion 101e is provided in the existing stem portion 101a of the existing femoral component 101, the artificial joint component 5 is used.

  And the rotation control part 20 provided in the component 5 for artificial joints is provided as a convex part which protrudes toward the existing femoral component 101 in the connection part 11, and it exists in said recessed part 101e in the existing femoral component 101. It is formed to fit. That is, the rotation restricting portion 20 is configured to engage with the existing femoral component 101. Thereby, the rotation restricting portion 20 is configured to restrict the displacement in the direction of rotation within the medullary cavity portion 100 a of the stem portion 12 formed integrally with the connecting portion 11.

  In the case of a surgery performed when the femur 100 is fractured, the artificial joint component 5 is used in the same manner as in the first embodiment. However, when the connecting portion 11 is inserted into the medullary cavity portion 100a together with the stem portion 12 and the connecting portion 11 is fixed to the existing femoral component 101, the rotation restricting portion 20 fits into the recess 101e as described above. Thus, the existing femoral component 101 is engaged.

  According to the artificial joint component 5 described above, the same effects as those of the first embodiment can be obtained. That is, according to the component 5 for artificial joints, when a fracture occurs in a patient who has already undergone artificial joint replacement and surgery is performed, it is possible to suppress the enlargement of the retracted portion and reduce the burden on the patient and the operator. At the same time, the risk of infectious diseases can be reduced.

According to the artificial joint component 5, the rotation restricting portion 20 is provided in the connecting portion 11. As a result, the stem portion 12 is maintained in a stable posture by restricting the displacement in the rotation direction within the medullary cavity portion 100a. For this reason, the fracture portion 100b can be more stably and firmly fixed, and a structure that facilitates reduction of the fracture portion 100b can be realized. Further, since the rotation restricting portion 20 engages with the existing femoral component 101, the connecting portion 11 and the stem portion 12 can be more firmly fixed to the existing femoral component 101, and the fracture portion 100b can be further fixed. A structure that can be stably and firmly fixed and can further facilitate reduction of the fractured portion 100b can be realized.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described. FIG. 15 is a cross-sectional view schematically showing a state in which the artificial joint component 6 according to the sixth embodiment of the present invention is applied to the femur 100, omitting the illustration of living tissue other than the femur 100. It is. In FIG. 15, the artificial joint component 6 and the femur 100 are partially cut away.

  In a patient who has already undergone artificial joint replacement for replacing the joint with an artificial joint, an artificial joint is inserted during a surgery performed when the bone (in this embodiment, the femur 100) in which the artificial joint is installed is broken. The joint component 6 will be used. In the present embodiment, as in the first embodiment, an example in which hip replacement has already been performed and the existing femoral component 101, which is another component in the present embodiment, has already been placed will be described. .

  The artificial joint component 6 shown in FIG. 15 includes a connecting portion 11 and a stem portion 12 configured in the same manner as the artificial joint component 1 of the first embodiment. However, the connection part 11 is different from the first embodiment in that a rotation restricting part is further provided. Hereinafter, about the structure similar to 1st Embodiment, description is abbreviate | omitted by attaching | subjecting the same code | symbol in drawing, or quoting the same code | symbol, and demonstrates a structure different from 1st Embodiment.

  FIG. 16 is a front view showing the artificial joint component 6, and is a diagram showing a partially cut cross-section. In the artificial joint component 6, the connecting portion 11 and the stem portion 12 are integrally formed, and the connecting portion 11 is provided with a rotation restricting portion configured to include a screw plate portion 21 and a plurality of screws 22. ing. The artificial joint component 6 is made of a metal such as titanium alloy, cobalt chrome alloy, stainless steel, or the like that has been approved as a medical device for living body implantation.

  As shown in FIGS. 15 and 16, the screw plate portion 21 includes a protruding portion 21 a that protrudes outward from the end portion of the connecting portion 11, and the connecting portion 11 and the protruding portion 21 a bent at a substantially right angle. A plate portion 21b formed in a plate shape extending substantially parallel to the stem portion 12 toward the opposite side to the stem portion 12 side is configured. The protruding portion 21a, the plate portion 21b, and the connecting portion 11 are integrally formed. The plate portion 21b has a plurality of through holes through which the screws 22 are inserted. In the state where the connecting portion 11 and the stem portion 12 are disposed in the medullary cavity portion 100a, the plate portion 21b is formed along the longitudinal direction of the femur 100 on which the existing femoral component 101 is disposed. It arrange | positions so that it may contact | abut to a side surface (the side surface of a joint side with respect to the fracture part 100b in the femur 100).

  In the existing femoral component 101 to which the artificial joint component 6 is connected, the existing stem portion 101a is provided with a plurality of through holes extending in a direction perpendicular to the longitudinal direction of the existing stem portion 101a. When such a through hole is provided in the existing stem portion 101a of the existing femoral component 101, the artificial joint component 6 is used.

  Each screw 22 in the rotation restricting portion of the artificial joint component 6 penetrates the through hole formed in the plate portion 21 b and the male screw that penetrates the through hole formed in the existing stem portion 101 a of the existing femoral component 101. It is provided as a member. The screw 22 is attached in a state in which the connecting portion 11 and the stem portion 12 are disposed in the medullary cavity portion 100 a and the plate portion 21 b is in contact with the joint side surface of the femur 100. At this time, each screw 22 is inserted into each through-hole in the plate portion 21b, engages with the existing stem portion 101a by passing through each through-hole in the existing stem portion 101a, and is screwed into the femur 100. It is attached in the state. The head of each screw 22 is locked with the plate portion 21b.

  As described above, the rotation restricting portion includes the screw plate portion 21 formed integrally with the connecting portion 11 and the plurality of screws 22 engaged with the screw plate portion 21 and the existing femoral component 101. It is configured. Accordingly, the rotation restricting portions (21, 22) are configured to restrict the displacement in the direction of rotation within the medullary cavity portion 100a of the stem portion 12 formed integrally with the connecting portion 11.

  In the case of an operation performed when the femur 100 is fractured, first, similarly to the first embodiment, the connecting portion 11 and the stem portion 12 are arranged in the medullary cavity portion 100a, and the connecting portion 11 and the existing femur are arranged. The bone component 101 is fixed. At this time, the protruding portion 21 a is protruded outward from the femur 100 in the fracture portion 100 b, and the plate portion 21 b is disposed so as to abut on the joint side surface of the femur 100. And each screw | thread 22 is inserted from the same retracted part as the retracted part in which the connection part 11 and the stem part 12 were inserted. Further, each screw 22 is inserted through each through hole in the plate portion 21b, penetrates each through hole of the existing stem portion 101a, engages with the existing stem portion 101a, and is screwed into the femur 100. Installed and fixed. Thereby, the treatment fixed so that the fracture part 100b is joined is completed.

  According to the artificial joint component 6 described above, the same effects as those of the first embodiment can be obtained. That is, according to the artificial joint component 6, when a fracture occurs in a patient who has already undergone artificial joint replacement and surgery is performed, it is possible to suppress the expansion of the retracted portion and reduce the burden on the patient and the operator. At the same time, the risk of infectious diseases can be reduced.

  According to the artificial joint component 6, the rotation restricting portion configured to include the screw plate 21 and the plurality of screws 22 is provided. As a result, the stem portion 12 is maintained in a stable posture by restricting the displacement in the rotation direction within the medullary cavity portion 100a. For this reason, the fracture portion 100b can be more stably and firmly fixed, and a structure that facilitates reduction of the fracture portion 100b can be realized. Further, since the rotation restricting portion engages with the existing femoral component 101, the connecting portion 11 and the stem portion 12 can be more firmly fixed to the existing femoral component 101, and the fracture portion 100b is further stabilized. Thus, it is possible to realize a structure that can be firmly fixed and that facilitates further reduction of the fracture portion 100b.

(Seventh embodiment)
Next, a seventh embodiment of the present invention will be described. FIG. 17 is a cross-sectional view schematically showing a state in which the artificial joint component 7 according to the seventh embodiment of the present invention is applied to the femur 100 while omitting the illustration of the living tissue other than the femur 100. It is. In FIG. 17, the artificial joint component 7 and the femur 100 are shown in a partially cutaway cross section.

In a patient who has already undergone artificial joint replacement for replacing the joint with an artificial joint, an artificial joint is inserted during a surgery performed when the bone (in this embodiment, the femur 100) in which the artificial joint is installed is broken. The joint component 7 is used. In the present embodiment, as in the first embodiment, an example in which hip replacement has already been performed and the existing femoral component 101, which is another component in the present embodiment, has already been placed will be described. . However, in the seventh embodiment, as the existing femoral component 101, an example is shown in which the end 101c is formed so as to smoothly extend without passing through a stepped diameter portion on the distal end side of the existing stem 101a. doing.

  The artificial joint component 7 shown in FIG. 17 and FIG. 18 is configured to include a connecting portion 23 and a stem portion 12 in the same manner as the artificial joint component 1 of the first embodiment. The stem portion 12 is integrally formed with the connecting portion 23 as in the first embodiment. However, the structure of the connection part 23 is different from the structure of the connection part 11 of the first embodiment. Hereinafter, about the structure similar to 1st Embodiment, description is abbreviate | omitted by attaching | subjecting the same code | symbol in drawing, or quoting the same code | symbol, and demonstrates a structure different from 1st Embodiment.

  As described above, the artificial joint component 7 is provided as a member in which the connecting portion 23 and the stem portion 12 are integrally formed. The artificial joint component 7 is formed of a metal such as titanium alloy, cobalt chromium alloy, stainless steel, or the like that has been approved as a medical device for living body implantation.

  The connecting portion 23 is provided as a joint-side end portion of the artificial joint component 7 and is configured as a portion connected to the existing femoral component 101. The connecting portion 23 is provided as a columnar portion having substantially the same diameter as a part of the femur 100, and is arranged to be replaced with a part of the femur 100 in the femur 100. It is configured. In addition, the connecting portion 23 is formed with a connecting hole 23 a that opens toward the joint side and is recessed in the longitudinal direction of the artificial joint component 7.

  The connection hole 23a of the connection part 23 is formed so that the end 101c of the existing stem part 101a in the existing femoral component 101 can be inserted and fitted. Thereby, the connection part 23 is comprised so that it may be fixed and connected with respect to this existing femoral component 101 at the edge part 101c on the opposite side to the joint side in the existing femoral component 101 through fitting. . The inner peripheral surface of the connecting hole 23a corresponds to the tapered side surface of the end portion 101c, and is formed as a tapered inner peripheral surface that forms a part of a conical curved surface and is inclined so as to be gently constricted. ing.

  Next, an operation in which the above-described artificial joint component 7 is applied when the femur 100 on which the existing femoral component 101 is disposed in a patient who has already undergone artificial joint replacement will be described. FIG. 19 omits illustration of living tissue other than the femur 100 in a state where a fracture has occurred in the vicinity of the end 101c of the existing stem 101a in the femur 100 in which the existing femoral component 101 is already arranged. FIG. In FIG. 19, the femur 100 is shown with a partially cutaway cross section, and the femur 100 is illustrated as being broken at the fracture portion 100b.

  When a fracture as shown in FIG. 19 occurs, the artificial joint component 7 is applied, and an operation in which the fracture portion 100b is fixed is performed. In this case, first, the surgeon performs a treatment for opening the vicinity of the fracture portion 100b. At this time, a retractable portion having a size capable of inserting the artificial joint component 7 from the end portion of the stem portion 12 (the end portion opposite to the connecting portion 11) to the connecting portion 23 is formed.

After the above retracted portion is formed, as shown in FIG. 20A, a resection portion 100d (a portion indicated by hatching in the drawing) which is a part of the femur 100 to be replaced with the connecting portion 23. A procedure for excision is performed. When the excision of the excision portion 100d is completed, the state shown in FIG. In this state, the stem portion 12 is inserted from the end portion side into the medullary cavity portion 100a of the femur 100 through the wound portion. Then, the stem portion 12 is inserted further into the medullary cavity portion 100a on the opposite side to the joint side through the location where the excised portion 100d of the femur 100 has been excised. At this time, the connecting portion 23 is disposed so as to be replaced with the excised portion 100d that has been excised at the location where the excised portion 100d has been excised.

  As described above, when the stem portion 12 is inserted into the medullary cavity portion 100a and the connecting portion 23 is disposed so as to be replaced with the excised portion 100d, the femoral 100 is already disposed on the joint side. The end portion 101c of the existing femoral component 101 and the connecting hole 23a of the connecting portion 23 are fitted. Thereby, the connection part 23 and the existing femoral component 101 are fixed and connected. After completion of the fixing operation of the artificial joint component 7 and the existing femoral component 101 by the above-described fitting, the fractured part subjected to the resection is fixed so as to be connected via the artificial joint component 7. Will be completed.

  According to the artificial joint component 7 described above, the same effects as those of the first embodiment can be obtained. That is, according to the artificial joint component 7, when a fracture occurs in a patient who has already undergone artificial joint replacement and surgery is performed, the spread of the wound can be suppressed, and the burden on the patient and the operator can be reduced. At the same time, the risk of infectious diseases can be reduced.

  According to the artificial joint component 7, the connecting portion 23 is disposed so as to be replaced with a part of the femur 100. For this reason, the femur 100 can be stably and firmly fixed by the connecting portion 23 replaced with a part of the femur 100.

  In the above-described embodiment, the artificial joint component 7 in which the connecting portion 23 and the stem portion 12 are integrally formed has been described as an example, but this need not be the case. The joint part 23 and the stem part 12 are provided as separate members, and the stem part 12 is an artificial joint component fixed on the opposite side to the side fixed to the existing femoral component 101 with respect to the connection part 23. You may implement.

(Eighth embodiment)
Next, an eighth embodiment of the present invention will be described. FIG. 21 is a cross-sectional view schematically showing a state in which the artificial joint component 8 according to the eighth embodiment of the present invention is applied to the femur 100, omitting the illustration of living tissue other than the femur 100. It is. In FIG. 21, the artificial joint component 8 and the femur 100 are partially cut away.

  In a patient who has already undergone artificial joint replacement for replacing the joint with an artificial joint, an artificial joint is inserted during a surgery performed when the bone (in this embodiment, the femur 100) in which the artificial joint is installed is broken. The joint component 8 will be used. In the present embodiment, as in the seventh embodiment, an example in which hip replacement has already been performed and the existing femoral component 101 which is another component in the present embodiment has already been arranged will be described. .

The artificial joint component 8 shown in FIG. 21 includes a connecting portion 23 and a stem portion 12 configured in the same manner as the artificial joint component 7 of the seventh embodiment. However, in the connection part 23, the structure is different from 7th Embodiment in the point in which the rotation control part 24 is further provided. Hereinafter, about the structure similar to 7th Embodiment, description is abbreviate | omitted by attaching | subjecting the same code | symbol in drawing, or quoting the same code | symbol, and demonstrates a structure different from 7th Embodiment.

  FIG. 22 is a front view showing the component 8 for artificial joints, and is a diagram showing a partially cut section. FIG. 23 is a view of the femur 100, the existing femoral component 101, and the artificial joint component 8 shown in FIG. 21 as seen from the direction of the arrow D in the drawing. In the artificial joint component 8, the connecting portion 23 and the stem portion 12 are integrally formed, and the rotation restricting portion 24 is provided in the connecting portion 23. The artificial joint component 8 is formed of a metal such as a titanium alloy, a cobalt chromium alloy, or stainless steel that has been approved for medical use as a medical device.

  As shown in FIGS. 21 to 23, the rotation restricting portion 24 protrudes toward the end portion of the femur 100 that has been subjected to resection processing at the end portion where the stem portion 12 of the connecting portion 23 is integrally formed. It is formed as a convex part. A pair of rotation restricting portions 24 are provided at positions along the diameter direction of the artificial joint component 5 formed in a columnar shape. Thus, the rotation restricting portion 24 is provided as a convex portion that protrudes toward the femur 100 at the connecting portion 23, and is configured to engage with the end portion of the femur 100. Thereby, the rotation restricting portion 24 is configured to restrict the displacement in the direction of rotation within the medullary cavity portion 100 a of the stem portion 12 formed integrally with the connecting portion 23. During the operation, the end of the femur 100 that engages with the rotation restricting portion 24 is provided with a recess 100e that is recessed to fit with the rotation restricting portion 24.

  In the case of surgery performed when the femur 100 is fractured, the artificial joint component 8 is used in the same manner as in the seventh embodiment. However, after the excision portion 100d is excised, the above-described recess 100e is formed at the end of the femur 100 into which the stem portion 12 is inserted. Then, when the stem portion 12 is inserted into the medullary cavity portion 100a and the connecting portion 23 is disposed so as to be replaced with the excised portion 100d that has been excised, as described above, the rotation restricting portion 24 is moved to the thigh. Engage with bone 100.

  According to the artificial joint component 8 described above, the same effects as those of the seventh embodiment can be obtained. That is, according to the artificial joint component 8, when a fracture occurs in a patient who has already undergone artificial joint replacement and surgery is performed, the spread of the retracted portion can be suppressed, and the burden on the patient and the operator can be reduced. At the same time, the risk of infectious diseases can be reduced. And since the connection part 23 is arrange | positioned so that a part of the femur 100 may be substituted, the femur 100 is stably fixed firmly by the connection part 23 replaced with a part of the femur 100. Can do.

  Further, according to the artificial joint component 8, the rotation restricting portion 24 is provided in the connecting portion 23. As a result, the stem portion 12 is maintained in a stable posture by restricting the displacement in the rotation direction within the medullary cavity portion 100a. For this reason, the fracture portion can be more stably and firmly fixed by the artificial joint component 8. Further, since the rotation restricting portion 24 engages with the femur 100, the connecting portion 23 and the stem portion 12 can be more firmly fixed to the femur 100, and the fracture portion can be fixed by the artificial joint component 8. Furthermore, it can be stably and firmly fixed.

(Ninth embodiment)
Next, a ninth embodiment of the present invention will be described. FIG. 24 is a cross-sectional view schematically showing a state in which the artificial joint component 9 according to the ninth embodiment of the present invention is applied to the femur 100 while omitting the illustration of the living tissue other than the femur 100. It is. In FIG. 24, the artificial joint component 9 and the femur 100 are shown in a partially cutaway cross section.

  In a patient who has already undergone artificial joint replacement for replacing the joint with an artificial joint, an artificial joint is inserted during a surgery performed when the bone (in this embodiment, the femur 100) in which the artificial joint is installed is broken. The joint component 9 is used. In the present embodiment, as in the first embodiment, an example in which hip replacement has already been performed and the existing femoral component 101, which is another component in the present embodiment, has already been placed will be described. .

  FIG. 25 is a cross-sectional view showing the artificial joint component 9. The artificial joint component 9 shown in FIGS. 24 and 25 includes a connecting portion 25 and a stem portion 26 that function in the same manner as the connecting portion 11 and the stem portion 12 of the first embodiment. However, unlike the first embodiment, in the component 9 for an artificial joint, the connecting portion 25 and the stem portion 26 are provided as separate members, and a plurality of stem portions 26 (26a, 26b, 26c) having different sizes are provided. ing. Hereinafter, the same configurations as those of the first embodiment in the femur 100 and the existing femoral component 101 are denoted by the same reference numerals in the drawings, the description thereof will be omitted, and the components of the artificial joint component 9 different from those in the first embodiment. Will be described.

  As described above, the artificial joint component 9 includes the connecting portion 25 formed as a separate member and a plurality of stem portions 26 (26a, 26b, 26c) having size variations. The artificial joint component 9 is formed of a metal such as titanium alloy, cobalt chromium alloy, stainless steel, or the like that has been approved as a medical device for living body implantation.

  The connecting portion 25 is provided as a member constituting an end portion on the joint side in the artificial joint component 9 and is configured as a portion connected to the existing femoral component 101. The connecting portion 25 is fixed to the stem portion 26 so as to open toward the joint side and to be recessed in the longitudinal direction of the connecting portion 25 and to protrude on the opposite side of the joint side. The fixing convex portion 25b is formed.

  The connecting hole 25a of the connecting portion 25 is formed so that the end portion 101c of the existing stem portion 101a in the existing femoral component 101 can be inserted and fitted. Thereby, the connection part 25 is comprised so that it may be fixed and connected with respect to this existing femoral component 101 at the edge part 101c on the opposite side to the joint side in the existing femoral component 101 through fitting. . The inner peripheral surface of the connecting hole 25a corresponds to the tapered side surface of the end portion 101c, and is formed as a tapered inner peripheral surface that forms a part of a conical curved surface and is inclined so as to be gently constricted. ing. Further, the fixing convex portion 25b provided so as to protrude to the side opposite to the joint side in the connecting portion 25 is provided as a male screw portion having a screw formed on the outer periphery.

  Each stem portion 26 (26a, 26b, 26c) is provided as a member that is formed in a columnar rod shape that is inserted into the medullary cavity portion 100a of the femur 100 and whose tip side is formed in a hemispherical shape. Thereby, each stem part 26 is comprised so that it may insert in the medullary cavity part 100a of the femur 100 on the opposite side via the fracture part 100b of the femur 100 with respect to the joint side.

In the artificial joint component 9, the stem portion 26 includes a plurality of stem portions (26 a, 26 b, 26 c) having different lengths in the longitudinal direction. In each stem portion (26a, 26b, 26c), on the end portion side fixed to the connection portion 25, the stem portion (26a, 26b, 26c) is opened in the direction toward the connection portion 25 to be fixed. Fixing recesses 27 are formed so as to be recessed in the direction. In each stem portion (26a, 26b, 26c), the fixing concave portion 27 is formed in the same shape, and the inner periphery thereof has a female screw portion screwed into the fixing convex portion 25b of the connecting portion 25. Is formed. As described above, the fixing concave portion 27 screwed to the fixing convex portion 25 b is provided, so that each stem portion (26 a, 26 b, 26 c) On the side opposite to the fixed side, it can be exchanged and fixed.

  Further, in the artificial joint component 9, the connecting portion 25 and the stem portion 26 (26 a, 26 b, 26 c) are configured so as to be entirely disposed in the medullary cavity portion 100 a of the femur 100. . FIG. 24 illustrates the artificial joint component 9 in which the stem portion 26 a is fixed to the connecting portion 25.

  In an operation performed when the femur 100 is fractured, the most appropriate stem portion 26 is first selected from the plurality of stem portions 26 (26a, 26b, 26c) by the operator. Then, the most suitable selected stem portion 26 is fixed to the connecting portion 25, and the artificial joint component 9 is configured. Thereafter, similarly to the connecting portion 11 and the stem portion 12 of the first embodiment, the connecting portion 25 and the stem portion 26 are disposed in the medullary cavity portion 100a, and the connecting portion 25 and the existing femoral component 101 are fixed. . Thereby, the treatment fixed so that the fracture part 100b is joined is completed.

  According to the artificial joint component 9 described above, the same effects as those of the first embodiment can be obtained. That is, according to the component 9 for artificial joints, when a fracture occurs in a patient who has already undergone artificial joint replacement and surgery is performed, it is possible to suppress the enlargement of the retracted portion and reduce the burden on the patient and the operator. At the same time, the risk of infectious diseases can be reduced.

  According to the artificial joint component 9, the stem portion 26 is provided as a plurality of replaceable members different from the connecting portion 25 and having different sizes. For this reason, when applying as a component 9 for artificial joints at the time of an operation, the optimal one according to a patient's condition is appropriately selected from a plurality of stem portions 26 (26a, 26b, 26c) having different sizes. Can do. Therefore, when preparing a plurality of stem parts 26 (26a, 26b, 26c) having size variations at the time of surgery, it is more efficient than when preparing a plurality of artificial joint components, Many sizes of prosthetic component 9 can be constructed. Further, since the connecting portion 25 that can be fixed to the existing femoral component 101 corresponding to the shape of the existing femoral component 101 and the stem portion 26 having a size variation can be individually manufactured, the artificial joint component 9 Can be made easier and the production efficiency can be improved.

  In the above embodiment, the fixing convex portion 25b and the fixing concave portion 27 are fixed as an example by screwing. However, this need not be the case. It may be a component for an artificial joint in which the fixing convex portion and the fixing concave portion are fixed by fitting. Moreover, the component for artificial joints by which the convex part for fixation is provided in a stem part, and the recessed part for fixation is provided in a connection part may be sufficient.

  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. In the first to ninth embodiments, the case where the artificial joint component is applied as the femoral component in the artificial hip joint has been described as an example. However, this need not be the case. For example, the present invention may be applied as a femoral component or a tibial component in an artificial knee joint. Further, the present invention may be applied as a component for an artificial joint in an artificial joint (an artificial elbow joint, an artificial shoulder joint, etc.) other than an artificial hip joint and an artificial knee joint.

  INDUSTRIAL APPLICABILITY The present invention can be widely applied as a component for an artificial joint used in an artificial joint and having a stem portion formed in a rod shape to be inserted into a medullary cavity of a bone.

DESCRIPTION OF SYMBOLS 1 Component for artificial joints 11 Connection part 12 Stem part 100 Femur (bone)
100a Spinal cavity part 100b Fracture part 101 Existing femoral component (other components)

Claims (4)

A component for an artificial joint that is used in an artificial joint and has a rod-shaped stem portion that is inserted into the medullary cavity of a bone,
In a surgical operation performed when the bone is fractured, a connection portion that is connected to another component that has already been arranged on the joint side of the bone as a component of the artificial joint by an artificial joint replacement that has already been performed. When,
The stem portion inserted into the medullary cavity portion of the bone on the opposite side to the joint side through the fracture portion of the bone;
With
The connecting portion is fixedly connected to the other component at the end opposite to the joint side in the other component, and is connected.
The stem portion is integrally formed or fixed to the connecting portion on the side opposite to the side fixed to the other component ,
The connection portion is provided with a rotation restricting portion for restricting a displacement of the stem portion in a direction of rotation within the medullary cavity portion,
The rotation restricting portion includes a screw plate portion formed integrally with the connecting portion, and a plurality of screws that engage with the screw plate portion and the bone,
The screw plate portion includes a protruding portion that protrudes outward from the connecting portion, and the stem portion side or the stem portion along the direction bent from the protruding portion and parallel to the connecting portion and the stem portion. A plate portion formed in a plate shape extending toward the side and the opposite side,
The protruding portion, the plate portion, and the connecting portion are integrally formed,
A plurality of through holes through which the screws are inserted are formed in the plate portion,
The screw penetrates the plate portion in a state where the connecting portion and the stem portion are disposed in the medullary cavity portion and the plate portion is disposed on a side surface of the bone along the longitudinal direction of the bone. A component for an artificial joint, which is inserted through a hole and attached in a state of being screwed to the bone . The component for an artificial joint according to claim 1,
The joint part and the stem part are disposed in the medullary cavity part as a whole. A component for an artificial joint that is used in an artificial joint and has a rod-shaped stem portion that is inserted into the medullary cavity of a bone,
In a surgical operation performed when the bone is fractured, a connecting portion that is connected to another component that is already placed on the joint side of the bone as a component of the artificial joint by an artificial joint replacement that has already been performed. When,
The stem portion inserted into the medullary cavity portion of the bone on the opposite side to the joint side through the fracture portion of the bone;
With
The connecting portion is fixedly connected to the other component at the end opposite to the joint side in the other component, and is connected.
The stem portion is formed integrally with the connecting portion on the side opposite to the side fixed to the other component,
The connecting portion is arranged to be replaced with a part of the bone in the bone,
The connection portion is provided with a rotation restricting portion for restricting a displacement of the stem portion in a direction of rotation within the medullary cavity portion,
The rotation restricting portion is formed as a convex portion protruding toward an end portion of the bone subjected to resection processing at an end portion where the stem portion in the connecting portion is integrally formed,
The component for artificial joints characterized in that the rotation restricting portion restricts displacement in the rotation direction of the stem portion in the medullary cavity portion by engaging with an end portion of the bone. The artificial joint component according to any one of claims 1 to 3 ,
The joint part component is fixed to the other component through fitting or screw connection.

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