KR101251580B1 - The Manufacturing Method of Acetabular Cup for Order-type Artificial Hip-joint - Google Patents

The Manufacturing Method of Acetabular Cup for Order-type Artificial Hip-joint Download PDF

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KR101251580B1
KR101251580B1 KR1020100133596A KR20100133596A KR101251580B1 KR 101251580 B1 KR101251580 B1 KR 101251580B1 KR 1020100133596 A KR1020100133596 A KR 1020100133596A KR 20100133596 A KR20100133596 A KR 20100133596A KR 101251580 B1 KR101251580 B1 KR 101251580B1
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design
acetabular cup
bone
center
acetabular
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KR1020100133596A
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KR20120071874A (en
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선두훈
김용식
김정성
신태진
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주식회사 코렌텍
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/34—Acetabular cups
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30721—Accessories
    • A61F2/30734—Modular inserts, sleeves or augments, e.g. placed on proximal part of stem for fixation purposes or wedges for bridging a bone defect
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof

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  • Orthopedic Medicine & Surgery (AREA)
  • Engineering & Computer Science (AREA)
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  • Heart & Thoracic Surgery (AREA)
  • Veterinary Medicine (AREA)
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  • Oral & Maxillofacial Surgery (AREA)
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  • Prostheses (AREA)
  • Manufacturing & Machinery (AREA)
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Abstract

The present invention relates to a method for producing a custom-made artificial hip joint acetabular cup provided according to the characteristics of each patient, and more specifically to a custom-made acetabular cup according to the characteristics of each patient based on the medical image of the patient accurately and quickly It can be manufactured and provides a way to align the design variables extracted from the medical image of the patient accurately and quickly in the actual design environment, and the internal diameter of the acetabular cup is selected from the pre-standard internal diameter design according to the external diameter size. This reduces the design period and enables the use of ready-made bearings to reduce costs. The flanges protruding from the outer diameter of the acetabular cup are separately designed by separate flanges for each bone direction around the acetabular cup, thereby reducing the material cost and Easy to set the direction during the procedure, bone in the acetabular Exactly design the bone filling area for filling the chamber portion and by so as to exactly combine them in the cup to provide a method for making the cup-demand hip, characterized in that for rapidly creating exact individual patient more customized cup.

Description

The Manufacturing Method of Acetabular Cup for Order-type Artificial Hip-joint}

The present invention relates to a method for producing a custom-made artificial hip joint acetabular cup provided according to the characteristics of each patient, and more specifically to a custom-made acetabular cup according to the characteristics of each patient based on the medical image of the patient accurately and quickly It can be manufactured and provides a way to align the design variables extracted from the medical image of the patient accurately and quickly in the actual design environment, and the internal diameter of the acetabular cup is selected from the pre-standard internal diameter design according to the external diameter size. This reduces the design period and enables the use of ready-made bearings to reduce costs. The flanges protruding from the outer diameter of the acetabular cup are separately designed by separate flanges for each bone direction around the acetabular cup, thereby reducing the material cost and Easy to set the direction during the procedure, bone in the acetabular Accurately design a bone filling to charge the chamber part region and to so as to exactly combine them in the cup to provide a method for making the cup-demand hip, characterized in that for rapidly creating exact individual patient more customized cup.

The hip joint is the joint between the femur and pelvis of the human body, and it is the joint that plays the most important role in sitting or standing, and can be damaged by various pathological causes and traumas. Artificial hip joint may be applied.

Typically, the artificial hip joint is composed of the acetabular cup 100 fixed to the acetabular portion of the pelvis (a) and the femoral stem (c) inserted and fixed to the femur (b), the femoral stem (c) and The acetabular cup 100 is made of, for example, a titanium alloy harmless to the human body. At the end of the femoral stem (c), the femoral head (c1) formed of ceramic or metal material is fixed, and in the acetabular cup (100), the bearing (200) for receiving and rotating the femoral head (c1) is fitted therein. 200 is made of ceramic material or polymer polyethylene. The artificial hip joint configured as described above is configured to allow the femoral head c1 to rotate about the bearing 200 according to the movement of the femur b and the femoral stem c.

Artificial hips can be broadly divided into pre-fabricated hips that are pre-fabricated according to certain specifications and custom-made hips that are manufactured to the individual characteristics of the patient for patients with femur shapes that are not suitable for the preformed hips. The most important factor required for the acetabular cup for hip arthroplasty is to provide accurate and rapid design and manufacture of the acetabular cup for each patient.

In addition, in designing the acetabular cup, it is also important to provide an acetabular cup that can accurately fill a bone loss site by identifying a site where bone is lost in each acetabular section.

In addition, there is a need for a flange design method that can reduce costs in designing a separate flange required to fix the acetabular cup to the acetabular part and / or the pelvis, and can also help constructability in the acetabular cup construction. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems,

Disclosure of Invention An object of the present invention is to provide a method for accurately and quickly producing a customized acetabular cup for a hip according to individual characteristics based on a medical image of a patient.

It is another object of the present invention to provide a method for accurately and quickly aligning design variables extracted from a medical image of a patient to an actual design environment, thereby providing a method for accurately manufacturing a hip cup for each patient.

Yet another object of the present invention is to reduce the design period and reduce the cost by using a ready-made bearing by using a method of selecting an inner diameter of the acetabular cup according to the size of the outer diameter. To provide.

Yet another object of the present invention is to separate the flanges protruding from the outer diameter of the acetabular cup into separate flanges for each of the bone directions around the acetabular portion, thereby improving the workability by allowing easy setting of the direction during the acetabular cup as well as material saving. It is to provide a production method.

Still another object of the present invention is to provide a method for precisely designing a bone filling site for filling a bone loss site in an acetabular zone and precisely combining it with an acetabular cup so as to quickly and accurately manufacture a custom acetabular cup for each patient.

Custom artificial acetabular cup manufacturing method for achieving the above object of the present invention includes the following configuration.

According to one embodiment of the present invention, a method for manufacturing an acetabular cup for an artificial hip joint according to the present invention comprises: extracting a design variable for designing and manufacturing acetabular cup from a pelvic shape information of a patient; A preprocessing step of aligning the information obtained in the design variable extraction step with the design environment of the acetabular cup; An acetabular cup design step of designing an acetabular cup suitable for a patient using the design variable extracted in the design variable extraction step.

According to another embodiment of the present invention, the design variable extracted in the design parameter extraction step in the custom artificial hip joint manufacturing method according to the present invention is the aspheric center and diameter calculated by extracting the curved surface information of the aspheric portion; A reference plane which interpolates the aspherical isolating lines around the aspheric portion in a plane; A normal vector directed anatomically inward from the acetabular center on the reference plane; It is characterized in that it comprises a; high bone density and bone fixation screw position for selecting a portion that can be fixed deeply fixed bone fixation screw.

According to another embodiment of the present invention, in the method for manufacturing an acetabular cup for custom artificial hip joint according to the present invention, the design variable extracted in the step of extracting the design variable is a portion capable of fixing the acetabular cup flange in the direction of each bone around the acetabular section. Selected flange fixing screw position; And a bone loss site center and radius in which the location and size of the bone where the bone of the acetabular bone is lost are calculated.

According to another embodiment of the present invention, the pretreatment step in the method for manufacturing a custom artificial hip cup according to the present invention is a plane alignment step of aligning the reference plane to the design plane of the design environment, and the center of the aspheric portion And a center alignment step of aligning to the center of the design environment, and a direction alignment step of aligning the normal vector to an upper direction of the design environment.

According to another embodiment of the present invention, the acetabular cup designing step in the method for manufacturing a custom artificial hip joint according to the present invention is an outer diameter design step of designing the outer diameter of the acetabular cup based on the center and diameter of the acetabular portion, the outer diameter design And an inner diameter selection step of selecting an inner diameter of the acetabular cup based on the outer diameter of the acetabular cup designed in the step, and a screw ball designing step of designing a screw hole to which the bone fixing screw can be coupled based on the bone fixation screw position. .

According to another embodiment of the present invention, the acetabular cup designing step in the method for manufacturing a custom artificial hip joint according to the present invention is a flange and a second protruding from the outer diameter of the acetabular cup based on the flange fixing screw position extracted in the design variable extraction step And a bone filling site design step for designing a bone filling site to be coupled to the bone loss site based on the flange design step of designing the screw hole and the bone loss site center and radius extracted in the design variable extraction step. .

According to another embodiment of the present invention, the flange design step in the method for manufacturing a custom artificial hip joint according to the present invention is designed by separating the flange into separate flanges for each bone direction around the acetabular portion, and the bone The filling site design step is to design an elliptical bone filling site that connects the radius forming point spaced from the center of the bone loss area with the end point of the deepest lost area, and establishes the center of the bone loss area and the center of the design environment. It is characterized in that for designing the bone filling site coupling hole that can be coupled to the bone filling site to the acetabular cup based on the connecting axis.

The present invention can obtain the following effects by the above-described embodiment, the constitution described below, the combination, and the use relationship.

The present invention has the effect of accurately and quickly producing a custom-made acetabular cup according to the characteristics of each patient based on the medical image of the patient.

The present invention provides a method for accurately and quickly aligning design variables extracted from a medical image of a patient to an actual design environment, and has an effect of accurately manufacturing an acetabular cup for each patient.

The present invention has the effect of reducing the cost by allowing the use of ready-made bearings as well as shortening the design period by using a method of selecting the inner diameter of the acetabular cup according to the size of the outer diameter in advance standardized design.

The present invention has the effect of improving the workability by separating the flanges protruding from the outer diameter of the acetabular cup into separate flanges for each bone direction around the acetabular portion so as to easily set the direction of the acetabular cup during the procedure. .

The present invention has the effect of accurately designing the bone filling site to fill the bone loss site in the acetabular cup and precisely combining it with the acetabular cup so as to quickly and precisely manufacture a customized acetabular cup for each patient.

Figure 1 is a schematic diagram showing a state in which the artificial hip joint
Figure 2 is a block diagram showing a process of manufacturing a custom artificial hip joint acetabular cup according to an embodiment of the present invention
3 is a reference diagram illustrating the extraction of the acetabular center and diameter from the pelvic shape information of the patient
4 is a reference diagram showing the extraction of the reference plane and the normal vector from the pelvis shape information of the patient
5 is a reference diagram showing the extraction of the bone fixation screw position from the pelvis shape information of the patient
6 is a reference diagram showing the extraction of the flange fixing screw position from the pelvis shape information of the patient
7 is a reference diagram showing the extraction of the bone loss center and radius from the pelvis shape information of the patient
8 is a reference diagram showing a process of a pretreatment step
9 is a reference diagram showing a process of designing the outer diameter of the acetabular cup
10 is a reference diagram showing a process of selecting the inner diameter of the acetabular cup design according to the standard
11 is a reference diagram showing a process of designing the screw hole of the acetabular cup
12 is a reference diagram showing a process of designing the flange and the second screw hole of the acetabular cup
13 is a reference diagram showing the process of designing the bone filling site of the acetabular cup
14 is a reference diagram showing a state in which the design of the acetabular cup is completed

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of a method for producing a custom-made acetabular cup for artificial hip according to the present invention will be described in detail.

Figure 1 is a schematic diagram showing a state in which the artificial hip is treated, Figure 2 is a block diagram showing the process of manufacturing a custom-made acetabular cup for hip joint according to an embodiment of the present invention, Figure 3 is acetabular from the pelvic shape information of the patient Figure 4 is a reference diagram showing the extraction of the center and diameter, Figure 4 is a reference diagram showing the extraction of the reference plane and the normal vector from the pelvis shape information of the patient, Figure 5 is a bone fixation screw from the pelvis shape information of the patient Figure 6 is a reference diagram showing the extraction of the position, Figure 6 is a reference diagram showing the extraction of the flange fixing screw position from the pelvis shape information of the patient, Figure 7 is the bone loss area center and radius from the pelvis shape information of the patient Figure 8 is a reference diagram showing the extraction, Figure 8 is a reference diagram showing the process of the pre-treatment step, Figure 9 is a reference diagram showing the process of designing the outer diameter of the acetabular cup FIG. 10 is a reference diagram illustrating a process of selecting an inner diameter of an acetabular cup and designing it to a standard. FIG. 11 is a reference diagram illustrating a process of designing a screw hole of an acetabular cup. FIG. FIG. 13 is a reference diagram illustrating a process of designing a ball gong, and FIG. 13 is a reference diagram illustrating a process of designing a bone filling site of an acetabular cup, and FIG. 14 is a reference diagram illustrating a design of a acetabular cup.

1 to 14, a method for manufacturing an acetabular cup for an artificial hip joint according to an embodiment of the present invention is a design variable extraction step for extracting a design variable for designing and manufacturing the acetabular cup 100 from the pelvic shape information of the patient ( S1); Pre-processing step (S3) for aligning the information obtained in the design variable extraction step (S1) according to the design environment of the acetabular cup (100); Acetabular cup design step (S5) for designing the acetabular cup 100 for the patient using the design variables extracted in the design variable extraction step (S1); and may include.

The design variable extraction step (S1) is a process of extracting design variables necessary for designing and manufacturing the acetabular cup 100 from the pelvic shape information of the patient, from X-ray image information or CT (Computer Tomography) of the pelvic shape of the patient. This refers to a process of obtaining 3D pelvic image information of a patient and extracting necessary design variables therefrom.

The patient's 3D pelvic image information can be obtained accurately using computer arithmetic processing and each image processing using the DICOM medical image information, the international medical imaging standard.

[Photo 1]

Figure 112010085302014-pat00001

As can be seen in the photograph 1, the necessary design variables are extracted from the three-dimensional pelvic image information of the patient thus obtained, and the necessary design parameters are extracted from the curved surface information of the aspheric portion and the diameter of the aspheric portion 301 and diameter 302; A reference plane 304 that interpolates the aspheric order 303 isolines around the aspheric portion in a plane; A normal vector 305 anatomically inward from the aspheric center on the reference plane 304; Bone fixation screw position 306 is selected in which the bone density is high and the bone fixation screw can be deeply fixed; A flange fixing screw position 307 for selecting a portion capable of fixing the acetabular cup flange 102 in the direction of each bone around the acetabular portion; A bone loss site center 308 and a radius 309 that calculate the position and size of the bone loss site of the acetabular zone.

The center 301 and the diameter 302 of the acetabular portion 300 are design variables necessary for designing the center and outer diameter of the acetabular cup 100 suitable for the patient, as shown in FIG. 3. Based on the shape of the acetabular zone, the distance from the acetabular center and the acetabular center to the acetabular order in the direction of illium, ischium, and pubis is interpolated, and the surface information of the acetabular part is interpolated to the sphere. The center and the diameter are obtained as the acetabular center 301 and the diameter 302, respectively.

Reference plane 304 is a reference for fitting the design variables obtained from the pelvic shape information of the patient to the actual design environment, as shown in Figure 4 as shown in the patient's three-dimensional pelvic shape information around the acetabular After generating points along the isoline, the reference plane 304 as a reference is selected by interpolating the points in one plane. A vector that is anatomically mediated from the center of the acetabular portion on the reference plane 304 is calculated as a normal vector 305, and is used as a reference for which side on the reference plane faces the aspheric portion.

The bone fixation screw position 306 means a position to perform a bone fixation screw for fixing the acetabular cup 100 in the acetabular portion when the designed acetabular cup 100 is performed, as shown in FIG. The bone fixation screw position 306 is selected based on the dimensional pelvic shape information. At this time, the bone fixation screw position is located at the site where the bone density is high and the bone fixation screw can be fixed around the acetabular region. It is preferable to select 306.

The flange fixing screw position 307 is designed to project the flange 102 protruding to the outer circumference of the acetabular cup 100 for seating and fixing the acetabular cup 100 in the acetabular procedure when the designed acetabular cup 100 is operated, and the designed flange 102 As a design variable required to select the position to perform the flange fixing screw to fix the), as shown in FIG. 6, the iliac (illium), the sciatic (ischium), and the pubis (pubis) The flange fixing screw position 307 is selected in the direction. In this case, the flange fixing screw has a portion where the bone density is high and the depth flange fixing screw can be fixed around the acetabular portion as compared with the CT image information of the patient. It is preferable to select the position 307.

The bone loss site center 308 and the radius 309 can be used to check the bone loss site, especially in patients with bone loss in the acetabular zone, to fill the bone loss site when designing the acetabular cup 100 for the patient. As a design variable required to design the bone filling site 104, bone loss site, based on the shape of the bone loss site in the acetabular zone shown in the patient's three-dimensional pelvic shape information, as shown in FIG. The center of the bone loss area is the center of the bone loss site 308, the radius between the radius of the bone loss site 310 and the bone loss area center 308 is the radius 309, the bone loss site A deeply indented part (the deepest missing part) is obtained as the endpoint 311.

Extracting the necessary design variables from the patient's three-dimensional pelvic shape information is performed by a program, which may be used as a pre-operation planning program.

The pre-processing step (S3) is a process of aligning the information obtained in the design variable extraction step (S1) according to the design environment of the acetabular cup 100, by using the design variables obtained in the design variable extraction step (S1) to fit the patient In order to design the acetabular cup 100, the design variables should be aligned to the actual design environment. For this purpose, the preprocessing step (S3) is a plane alignment step (S31) for aligning the reference plane 304 with the design plane of the design environment. ), A center alignment step S32 for aligning the center 301 of the aspheric part with the center of a design environment, and a direction alignment step S33 for aligning the normal vector 305 in an upward direction of the design environment. It may include.

The plane alignment step S31 is a process of aligning the reference plane 304 obtained in the design variable extraction step S1 with the design plane 500 of the design environment, as shown in (1) of FIG. 8. The reference plane 304 obtained in the variable extraction step S1 is aligned with the design plane 500 of the actual design environment.

The center alignment step S32 is a process of aligning the center 301 of the aspheric part obtained in the design variable extraction step S1 with the center of the design environment, as shown in (2) of FIG. 8. 301 is aligned with the center of the acetabular cup which is a reference on the design plane 500.

The direction alignment step (S33) is a process of aligning the normal vector 305 obtained in the design variable extraction step (S1) to the upper direction of the design environment, which side of the design plane 500 in the design environment inside the aspherical part As shown in (1) of FIG. 8, the normal vector 305 obtained in the design variable extraction step S1 is aligned with the upper direction of the design plane 500 in the design environment. .

As described above, when the alignment with the design environment is completed through the plane alignment step S31, the center alignment step S32, and the direction alignment step S33, the extracted design variables are extracted from the center of the aspheric cup on the design plane 500. Place them in a relative position from the center to complete the alignment of the design variables required for the design.

The acetabular cup designing step (S5) is a process of designing the acetabular cup 100 for a patient using the design variable extracted in the design variable extraction step (S1), wherein the acetabular cup designing step (S5) is the acetabular center ( 301 and the inner diameter of the acetabular cup 100 based on the outer diameter designing step S51 for designing the outer diameter of the acetabular cup 100 based on the diameter 302 and the outer diameter of the acetabular cup 100 designed in the outer diameter designing step S51. Selecting the inner diameter selection step (S52), the screw hole design step (S53) for designing the screw hole 101 that can be coupled to the bone fixing screw based on the bone fixing screw position 306, and the design variable extraction step ( Flange design step (S54) for designing the flange 102 and the second screw hole 103 protruding from the outer diameter of the acetabular cup 100 based on the flange fixing screw position 307 extracted in S1), and the design variable extraction step ( Based on the bone loss site center 308 and the radius 309 extracted from S1) to bind to the bone loss site It may include a bone filling site design step (S55) for designing the bone filling site 104.

The outer diameter design step (S51) is a process of designing the outer diameter of the acetabular cup 100 based on the aspheric center 301 and the diameter 302 extracted in the design variable extraction step (S1), as shown in Figure 9 The outer diameter of the acetabular cup 100 is designed in consideration of the diameter from the center of the acetabular cup 100 to the outer diameter based on the acetabular center 301 and the diameter 302 extracted in the variable extraction step S1.

The inner diameter selection step (S52) is a process of selecting the inner diameter of the acetabular cup 100 on the basis of the outer diameter of the acetabular cup 100 designed in the outer diameter design step (S51), in particular in the present invention to independently design the inner diameter of the acetabular cup By using a method of selecting a pre-standard inner diameter design according to the size of the acetabular cup outer diameter instead of the method, it is possible to reduce the design period as well as to use the ready-made bearing to reduce the cost. Accordingly, as shown in FIG. 10, the inner diameter design of the acetabular cup 100 is made based on a standardized inner diameter design selected according to the size of the outer diameter of the aspheric cup.

The screw hole design step (S53) is a process of designing a screw hole 101 capable of engaging a bone fixation screw based on the bone fixation screw position 306 extracted in the design variable extraction step (S1), as shown in FIG. 11. As shown in FIG. 2, an axis connecting the center of the acetabular cup 100 and the bone fixation screw position 306 disposed around the design plane of the design environment is created, and the bone fixing screw is coupled to the outer diameter of the acetabular cup 100 according to the axis. The screw hole 101 can be designed.

The flange design step (S54) is to design the flange 102 and the second screw hole 103 protruding from the outer diameter of the acetabular cup 100 based on the flange fixing screw position 307 extracted in the design variable extraction step (S1) As a process, in the present invention, especially when designing the flange 102 of the acetabular cup, the flange 102 is not a way of designing a simple flange that surrounds the entire acetabular cup 100. , Iliac (illium), sciatic (ischium), pubic (pubis) by separate design, each with a separate flange (102) to reduce the material, as well as to easily set the direction during the operation of the acetabular cup (100) It is characterized in that to be able to improve. Accordingly, as shown in FIG. 12, a separate flange 102 is designed by tying a screw hole for each bone direction around the acetabular portion (acetabular cup) (usually three directions are preferable), and each flange 102 is extracted. The second screw hole 103 is designed to fit the flange fixing screw position 307.

The bone filling site design step (S55) is a process of designing a bone filling site 104 to be coupled to the bone loss site based on the bone loss site center 308 and the radius 309 extracted in the design variable extraction step (S1). , The method for producing a custom-made acetabular cup for hip joint according to the present invention is a method for manufacturing acetabular cup for each patient, especially bone bone to fill the bone loss site during the production of acetabular cup 100 for patients with bone loss in the acetabular part. The filling part 104 may be designed and provided together with the acetabular cup 100, at which time, as shown in FIG. 13, a radius 309 is separated from the bone loss part center 308 extracted in the design variable extraction step S1. Two radial formation points (310, two radial formation points are symmetric with respect to the bone loss centers) and the deepest indentations (the deepest loss areas). Endpoint Design the bone filling site 104 in an elliptical shape connecting the (311), and the center of the bone loss site 308 and the center of the design environment (that is, the center of the acetabular cup-which is in line with the center of the acetabular zone). By designing the bone filling site engaging hole (105-FIG. 14) formed in the outer diameter of the acetabular cup 100 to allow the bone filling site 104 to be coupled to the acetabular cup based on the connecting axis X. Patients with bone loss sites, especially in the acetabular region, can be precisely designed to allow the bone filling site 104 to fill the bone loss site and to be precisely coupled to the acetabular cup 100 (in this case, typically a screwed joint is used). Personalized acetabular cups can be produced accurately and quickly.

The design of the acetabular cup 100 is completed through the acetabular cup designing step S5 as shown in FIG. 14.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Should be interpreted as belonging to the scope.

DESCRIPTION OF SYMBOLS 100 Aspheric cup 101: Screw hole 102: Flange 103: 2nd screw hole
104: bone filling site 105: bone filling site binding hole
200: bearing
301: Aspheric center 302: Aspheric diameter 303: Ascending
304: reference plane 305: normal vector
306: rib fixing screw position 307: flange fixing screw position
308: center of bone loss site 309: radius of bone loss site 310: radius formation point
311: Endpoint
500: design plane
a: pelvis b: thigh c: thigh stem c1: thigh head

Claims (7)

delete A design variable extraction step of extracting design variables necessary to design and manufacture an acetabular cup from the pelvic shape information of the patient;
A preprocessing step of aligning the information obtained in the design variable extraction step with the design environment of the acetabular cup;
An acetabular cup design step of designing an acetabular cup suitable for a patient using the design variable extracted in the design variable extraction step;
The design variable extracted in the design variable extraction step may include a center and a diameter of the aspherical portion calculated by extracting curved surface information; A reference plane which interpolates the aspherical isolating lines around the aspheric portion in a plane; A normal vector directed anatomically inward from the acetabular center on the reference plane; High bone density and bone fixation screw position for selecting the site that can be fixed to the bone fixation screw deeply; Custom-made acetabular cup manufacturing method comprising a. The method of claim 2, wherein the design variable extracted in the design variable extraction step
A flange fixing screw position for selecting a portion capable of fixing the acetabular cup flange in the direction of each bone around the acetabular portion; Method for producing a custom-made acetabular cup for hip joints, characterized in that it further comprises; center and radius of bone loss site that calculated the position and size of the bone loss site. The method of claim 2, wherein the pretreatment step
A plane alignment step of aligning the reference plane with a design plane of a design environment;
A center alignment step of aligning the center of the aspheric part with the center of the design environment;
And a direction alignment step of aligning the normal vector to an upper direction of a design environment. The method of claim 4, wherein the acetabular cup design step
An outer diameter design step of designing an outer diameter of the acetabular cup based on the center and diameter of the acetab;
An inner diameter selection step of selecting an inner diameter of the acetabular cup based on the outer diameter of the acetabular cup designed in the outer diameter designing step;
Method for manufacturing a custom artificial hip joint, characterized in that it comprises a screw hole design step of designing a screw hole that can be coupled to the bone fixation screw based on the bone fixation screw position. The method of claim 5, wherein the acetabular cup design step
A flange design step of designing a flange and a second screw hole protruding from the outer diameter of the acetabular cup based on the flange fixing screw position extracted in the design variable extraction step;
A method for manufacturing an acetabular cup for a custom artificial hip joint, further comprising a bone filling site design step of designing a bone filling site to be coupled to the bone loss site based on the bone loss site center and radius extracted in the design variable extraction step. The method according to claim 6,
The flange design step is designed to separate the flange into a separate flange for each bone direction around the aspherical part,
The bone filling site design step is to design an elliptical bone filling site that connects the radius forming point spaced apart from the center of the bone loss site by the radius and the end point of the deepest missing area, and the center of the bone loss site and the design environment. A method for producing a custom-made acetabular cup for hip joints, characterized in that for designing a bone filling site coupling hole that can couple the bone filling site to the acetabular cup based on the axis connecting the center.
KR1020100133596A 2010-12-23 2010-12-23 The Manufacturing Method of Acetabular Cup for Order-type Artificial Hip-joint KR101251580B1 (en)

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