KR100917715B1 - The design method of custom-made artificial hip-joint and computer readable recording medium storing program performing the method - Google Patents

Abstract

A design method of a custom-made artificial hip-joint and a computer readable recording medium storing a software program performing the method are provided to correct the position of a femur and the length of a leg in a software program more accurately by modularizing the design for operating tools of an artificial hip-joint. The body design proper to the characteristic of a patient or an artificial hip joint implant of various forms is selected(S2), and a neck and a head proper to the body design is designed(S3). A femur system for an artificial hip-joint or an operating tool is designed by unifying the body design with the neck and hip design(S4). Based on the unified design, the femur system for the artificial hip-joint and the model and plan for the operating tool are automatically produced(S5).

Description

The Design Method of Custom-made Artificial Hip-joint and Computer Readable Recording Medium Storing Program Performing The Method

The present invention relates to a method for designing a custom hip joint provided according to the characteristics of individual patients using a computer program, and more particularly, various types of hip joints standardized in advance using design variables extracted from the patient's femur shape information. Body selection step of selecting the body design according to the characteristics of the patient during the design of the femoral stem or surgical instrument (rasp); Modularizing the femoral stem or the rasp, including; designing the neck and the head to design the neck and head of the femoral stem or the rasp according to the body design selected in the body selection step using the design variables. The present invention relates to a customizable hip joint design method and a computer-readable recording medium recording a program for performing the same, characterized in that it is possible to quickly and inexpensively design a custom hip joint that exactly matches the characteristics of each patient.

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 hip joint is composed of an acetabular cup (3) fixed to the acetabular pelvis (4) and a femoral stem (1) fixed to the femur (2), as shown in Figure 1, femoral stem (1) and acetabular cup (3) is made of, for example, a titanium alloy which is harmless to the human body. At the end of the femoral stem 1, the femoral ball head 5 formed of ceramic or metal material is fixed, and in the acetabular cup 3, a corresponding hemisphere 7 in which the femoral head 5 is accommodated and rotated is fitted. The corresponding hemispheres 7 are made of ceramic material or polymer polyethylene. The artificial hip joint configured as described above allows the femoral head 5 to rotate about the corresponding hemisphere 7 according to the movement of the femur 2 and the femoral stem 1.

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 part required for the hip joint is the head offset length (ⓐ) from the center of the femoral head associated with the position of the femoral head and the head offset length (ⓐ) of the patient, as shown in FIG. The head longitudinal offset length (ⓑ) from the center of the femoral head associated with the leg length must be corrected correctly and the product must be designed and supplied as quickly as possible.

In addition, in the case of a conventional artificial hip joint, it is necessary to have all the instruments necessary for various procedures such as a drilling mechanism or various mechanisms necessary for expansion after drilling to treat the insertion space of the femoral stem of the custom artificial hip joint on the femur, and also There was a problem that it takes a lot of time and money to perform the procedure.

The present invention has been made to solve the above problems,

The object of the present invention is to program the design of the custom-designed hip joint femoral stem or surgical instrument (rasp) to the body portion and neck and head portion by modular design can accurately correct the leg length and the position of the femoral head of the patient, It is to provide a custom artificial hip design method that can be designed quickly.

Another object of the present invention is to determine the characteristics of the patient during the body design of various types of hip joint femoral stem or surgical instrument which is pre-standardized in the design of the body portion of the custom-designed hip joint femoral stem or surgical instrument (rasp). By using the method of selecting the right body design, it provides a custom artificial hip design method that can shorten the design and manufacturing time.

Another object of the present invention is to automatically modeling and drawing when the design of the custom hip joint femoral stem or surgical instrument (rasp) can be checked immediately to modify the modifications, it is possible to shorten the design and manufacturing period To provide a custom artificial hip design method.

It is still another object of the present invention to provide a computer readable recording medium having recorded thereon a program for performing a custom hip joint design method according to the present invention.

Computer-readable recording medium recording a custom artificial hip design method and a program for performing the same for achieving the above object of the present invention includes the following configuration.

According to one embodiment of the present invention, according to the present invention, the method for designing an artificial hip joint according to the present invention is a method for designing an artificial hip joint using a program. a body selection step of selecting a body design suitable for a patient's characteristics among the body designs of the rasp); And a neck and head design step of designing a neck and a head suitable for the body design of the femoral stem or a surgical instrument selected in the body selection step using the design variables.

According to another embodiment of the present invention, in the on-demand hip design method according to the present invention, the design variable used in the body selection step is the width of the lumen of the patient's femur, and the design variable used in the neck and head design step is the femur It is characterized in that the horizontal length from the center of the head to the vertical axis of the femur and the vertical length from the center of the femur head to the small electrons.

According to another embodiment of the present invention, in the on-demand artificial hip design method according to the present invention, the body selection step includes a design variable input step of inputting a design variable; A body design database call step of accessing the body design information of the artificial hip joint femoral stem or the surgical instrument stored in the database; Joining position selection step of placing the body of each femoral stem or surgical instrument to a junction position that can be bonded to the femur of the patient; A comparison and judging step of comparing the design variables inputted through the design variable input step at each joint position with the body design information of the femoral stem or the surgical instrument which is databased; If the value of the body design information of the femoral stem or the surgical instrument is within the range of applying the tolerance to the width of the patient's lumen through the comparison of the comparison judgment step, the body design of the femoral stem or the surgical instrument is selected as a candidate group. Selection candidate group selection step; And a ranking step of classifying the candidate groups selected through the selection candidate group classification step into the largest femoral stem or the body order of the surgical instrument.

According to another embodiment of the present invention, in the on-demand hip joint design method according to the present invention, the DICOM medical imaging information by imaging equipment photographed before the body selection step and the neck and head design step Femur shape information obtaining step of obtaining the femoral shape information of the patient through; A design variable extraction step of extracting a design variable from the femur shape information of the patient obtained in the femoral shape information obtaining step; And a body design database construction step of storing a database of body designs of various types of pre-standardized hip joint femoral stems and surgical instruments (rasps).

According to still another embodiment of the present invention, in the on-demand hip joint design method according to the present invention by integrating the body design selected in the body selection step and the neck and head design designed in the neck and head design step for artificial hip joint An integrated design step of designing a stem or a surgical instrument (rasp); characterized in that it further comprises.

According to another embodiment of the present invention, in the on-demand hip joint design method according to the present invention to automatically create a model and drawings of the hip joint femoral stem or surgical instrument (rasp) based on the design designed in the integrated design step Model and drawing steps; Characterized in that it further comprises.

Another embodiment of the present invention is characterized in that the computer-readable recording medium recording a program for performing the on-demand hip joint design method according to the present invention.

The present invention can obtain the following effects by the configuration, combination, and use relationship described above with the present embodiment.

The present invention is designed to modularize the design of custom hip joint femoral stem or surgical instrument (rasp) into the body portion, neck and head portion to accurately correct the leg length and the position of the femoral head of the patient, and quickly Provides a customizable hip design method that can be designed.

The present invention is designed in accordance with the characteristics of the patient during the design of the body of the femoral stem or surgical instrument (rasp) of the various types of hip joints or rasp for the custom-designed hip joint By using the method to select the design of the artificial hip joint design method that can shorten the design and manufacturing period.

According to the present invention, when the design of the custom hip joint femoral stem or surgical instrument (rasp) is completed, modeling and drawings are automatically created to check the modifications on the fly, and the custom artificial hip joint can shorten the design and manufacturing period. Provide design methods.

The present invention provides a computer readable recording medium having recorded thereon a program for performing a custom hip joint design method according to the present invention.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of a custom artificial hip design method according to the present invention and a computer-readable recording medium recording a program for performing the same.

Figure 3 is a block diagram of a custom artificial hip design method according to an embodiment of the present invention, Figure 4 is a femur shape information picture of the patient, Figure 5 is a schematic diagram showing the design parameters extracted from the femur shape information of the patient, Figure 6 is a screen showing the body design database of the femoral stem or surgical instrument, Figure 7 is a design variable input screen in the body selection step, Figure 8 is a flow chart showing the process of the body selection step, Figure 9 neck and head Design variable input screen in the design stage, Figure 10 is a schematic diagram showing the process of the integrated design stage, Figure 11 is a screen showing the confirmation and storage step, Figure 12 is a screen showing the modeling custom hip joint, Figure 13 Is a screen showing a state in which a drawing of a custom artificial hip joint is made.

Referring to FIG. 3, a method for designing an artificial hip joint according to an embodiment of the present invention is a method for designing an artificial hip joint using a program, in which various types of femoral stems or surgical instruments for the hip joint are pre-standardized using design parameters. Body selection step (S2) of selecting a body design according to the characteristics of the patient of the (rasp) body design; A neck and head design step (S3) of designing a neck and a head suitable for the body design of the femoral stem or a surgical instrument (rasp) selected in the body selection step (S2) using design variables; Integrated design step (S4) for designing the hip joint or rasp for artificial hip by integrating the body design selected in the body selection step (S2) and the neck and head design designed in the neck and head design step (S3) ); And a model and drawing creation step (S5) for automatically creating a model and a drawing of the artificial femoral stem or surgical instrument (rasp) based on the design designed in the integrated design step (S4).

The body selection step (S2) of the body design of the hip joint femoral stem (1) or the surgical instrument (rasp, 9) of various forms of the standardized in advance using design parameters extracted from the patient's femur (2) shape information It means the process of selecting the body design suitable for the patient's characteristics.

Extract the necessary design variables from the patient's femur shape information before the body selection step (S2), and to the body design of the various types of pre-standardized hip joint femoral stem (1) or surgical instrument (rasp, 9) The step of constructing and storing a database related to the above-described method should be preceded, and the process of extracting the necessary design variables from the femoral shape information of the patient is performed by taking a medical image (S11), obtaining the femoral shape information (S12), and extracting a design variable (S13). It can be made, including).

The medical imaging step (S11) is a process of photographing the femur and the surrounding area of the patient using imaging equipment such as X-rays,

The femur shape information acquisition step (S12) is a patient's femur using computer arithmetic processing and each image processing by using the DICOM medical image information, which is an international medical imaging standard obtained in the medical imaging step (S11) (2) The process of obtaining the correct value for the shape information.

The design variable extraction step (S13) is a process of extracting the necessary design variables from the femur (2) shape information obtained in the femur shape information acquisition step (S12), as shown in FIG. 5, the width of the intraluminal lumen 23 of the patient femur 2, the horizontal length ⓐ from the center of the femoral head 5 to the vertical central axis Y of the femur 2 is shown. And the vertical length (ⓑ) from the center of the femoral head (5) to the small electrons 21, among which the width of the lumen 23 of the patient's femur 2 is specifically the front shape of the femur 2. The width of bone lumen (①) at the top end point of the small cell (21), the width of the bone lumen (②) at the site of the small cell (21) at the vertical center axis (Y), which can be obtained from In (21), the width of the bone lumen (③) at the lower part by W1 (the length from the small element 21 to the proximal end 111 of the femoral stem), and the W2 in the small atom 21 (the small element 21). Intramural lumen width (4) at the lower portion by the length of the distal end 113 of the femoral stem), and the intraosseous lumen at the upper end of the small electron 21 obtained from the lateral shape of the femur 2). Width (⑤), width of bone lumen (⑥) at the lower part by W1 (the length from the trochanter 21 to the proximal end of the femoral stem 111) of the trochanter 21, the trochanter 21 In W2 (the length from the small element 21 to the distal portion 113 end of the femoral stem) means the width of the lumen (⑦) and the like in the lower portion. Extracting the necessary design variables from the femur (2) shape information is carried out by a program, the pre-operation planning program can be used as a program used.

The core of the hip joint design method using the program according to the present invention is the body (11,91) and the neck (13,93) and the head (1) of the customized hip joint femoral stem (1) or surgical instrument (rasp, 9) 15,95) is modularized to design, respectively, the design of the double body (11,91) part is not to design the body (11,91) part individually for each patient, but the existing femoral stem for Based on the information on the body (11,91) of the surgical instrument (rasp) will be used to select the body design best suited to the characteristics of the patient.

As shown in FIG. 6, the body design database construction step (S14) is performed by pre-standardization of various types of body 11, 91 of the femoral stem 1 or surgical instrument rasp 9 of various types. This is the process of storing the design as a database in the storage device such as hard disk,

The body selection step (S2), as can be seen in Figure 7, after receiving the design variables according to the shape of the femur of each patient, and then stored in the database through the body design database construction step (S14) stored femoral stem or surgical instrument Among the body designs of the patient, the method of selecting the body design suitable for the characteristics of the patient is used.

The program used at this time may be used Auto-Parametric Design Application of Programming Interface (API) and the like, and the design variable used at this time is the width and femur (2) of the lumen 23 of the patient femur (2) of the design variables ) The length (②) from the vertical center axis (Y) to the small electrons (21), where the width of the intraluminal lumen (23) of the patient's femur (2) is obtained from the front shape of the femur (2). Width of the lumen (①) at the top end point of the small trochanter 21, from the small trochanter 21 to the end of the proximal portion of the femoral stem (shown in 111-Fig. The width of the lumen (3) at the lower portion by the length), and the lower portion by the width of the bony 21 to W2 (the length of the femur 21 to the distal end of the femoral stem (shown in FIG. 1)). Width (④) of the lumen of the lumen in the thigh, width of the lumen (⑤) at the upper end of the small electron 21 obtained from the lateral shape of the femur (2) In (21), the width of the bone lumen (6) in the lower portion by W1 (the length from the small element 21 to the proximal end 111 of the femoral stem), and the W2 in the small atom 21 (the small element 21) The length of the distal end of the femoral stem 113 to the end) means the width of the lumen (⑦) in the lower portion.

As can be seen in Figure 7, the input of the design variable according to the type of the body (11,91) is a design parameter input program and the femoral stem for the hip joint (1) or a surgical instrument which is previously databased as described above By comparing the design database of the body (11,91) of the (rasp, 9), the appropriate body of the hip joint (1) or the body (11,91) of the surgical instrument (rasp, 9) is automatically selected. At this time, the optimal hip joint femoral stem (1) or the body (11,91) of the surgical instrument (rasp, 9) and the joint position (where the joint position is a hip joint femoral stem etc. is inserted into the patient's femur fixed) Looking at the method of selecting (indicates the position) in detail with reference to FIG.

First, among the design variables extracted in the design variable extraction step (S13) through the design variable input step (S21), the width of the bone lumen 23 of the patient femur (2) and the vertical center axis (Y) of the femur (2) If the design variable for the length (②) to the small element 21) is inputted, the thighs are stored and databased in the body design database construction step S14 through the body design database call step S22. The body (11,91) information of the stem (1) or the surgical instrument (rasp, 9) is imported, and the body of the femoral stem (1) or the surgical instrument (rasp, 9) through the joint position selection step (S23) 11,91) is located at the highest point of the joint position that can be joined to the femur of the patient, and then the design variables and the body of the femoral stem (1) or the surgical instrument (rasp, 9) input through the comparison judgment step (S24) (11,91) by comparing the information to the patient (11,91) information of the femoral stem (1) or the instrument (rasp, 9) If it fits within the range of the value to which the tolerance is applied to the width of the bone lumen, it is classified into the selection candidate through the selection candidate group classification step (S25), and if it is out of the range of the value to which the tolerance is applied, the joint position selection step (S23) is again performed. The comparative determination is repeatedly performed as described above while starting to lower the junction position from the highest point. From the body design database call step (S22) to repeat the selection candidate group classification step (S25) to the body (11,91) of the body information of all the femoral stem (1) or surgical instrument (rasp, 9) that is database When the design selection candidate group is completed, the body (11,91) of the largest femoral stem (1) or the surgical instrument (rasp, 9) and its joint position are selected as the first positions through the ranking selection step (S26). The rest will be ranked after.

The neck and head design step (S3) is a neck (13,93) suitable for the design of the body (11,91) selected in the body selection step (S2) using the design parameters extracted from the patient's femur (2) shape information ) And the head (15,95) design process.

The present invention is to solve the problem that the correction of the position of the femoral ball head and the leg length of the patient according to the design of the body portion and neck and head portion of the femoral stem (1) or surgical instrument (rasp, 9) at once The modular design of each, the design of the double neck portion 13, 93 and the head (15, 95) portion as shown in Figure 9, the body 11, selected in the body selection step (S2) 91) Cervical neck suitable for the characteristics of the patient by inputting the joint position selected in the body selection step (S2) and the design variable extracted from the patient's femur (2) shape information through the design parameter extraction step (S13) based on the design The 13 and the head 15 are automatically designed.

In this case, an auto-parametric design application of programming interface (API) or the like may be used, and a design variable used at this time is a vertical center axis of the femur 2 at the center of the femoral head 5 among the design variables. Y) and the horizontal length (ⓐ) and the vertical length (ⓑ) from the center of the femoral head (5) to the small electrons (21), which is the head offset relative to the position and leg length of the patient's femoral head. length) and head longitudinal offset length.

In this way, the design parameters extracted from the patient's femur (2) shape information in consideration of the joint position of the body (11,91) based on the design of the body (11,91) selected in the body selection step (S2) When designing the neck (13,93) and head (15,95) according to the characteristics of the patient by using this, it is possible to correct the position of the femoral head and the leg length of the patient through this can reduce the sequelae, It can be applied to special situations such as malformations. For reference, the cervical and head design step (S3) according to the present invention by using a mouse on the design program directly drag the neck and head design to the patient's femur (2) shape information to fit the characteristics of the neck and head It is not excluded that a way to design / correct a design can also be used.

The integrated design step (S4) is the artificial design designed in the body design and the neck and head design step (S3) of the artificial hip joint (1) or the surgical instrument (rasp, 9) selected in the body selection step (S2) It refers to the process of designing the hip joint femoral stem (1) or the surgical instrument (rasp, 9) by integrating the neck and head design of the hip joint femoral stem (1) or surgical instrument (rasp, 9).

As shown in FIG. 10, the body design of the artificial hip joint femoral stem 1 or the surgical instrument rasp 9 selected in the body selection step S2 and the neck and head design step S3 are selected. Shape information of the patient's femur (2) by allowing the complete design of the custom hip joint to be completed by a simple process of combining the neck and head design of the hip joint femoral stem (1) or the surgical instrument (rasp, 9). Using only the design variables extracted from the system, it is possible to quickly and accurately design a custom hip joint suitable for individual patient characteristics.

In this case, as shown in FIG. 11, before completing the entire design of the custom hip joint, a check and storage step of checking the design variables that have been input so far and designating a location where the designed custom hip joint is to be stored is additionally added. It may include. As the program used in the integrated design step S4, an Auto-Parametric Design API (Application of Programming Interface) may be used.

The model and drawing creation step (S5) refers to a process of automatically creating a model and a drawing of the artificial femoral stem (1) or the surgical instrument (rasp, 9) based on the design designed in the integrated design step.

This is after the design of the custom hip joint is completed through the body selection step (S2), neck and head design step (S3), integrated design step (S4) of the custom hip joint design method using the program according to the present invention, As shown in FIG. 12, the modeling of a custom artificial hip joint product to be actually produced on a 2D or 3D screen is automatically performed, and the user checks in advance before entering the actual manufacturing process of the custom artificial hip joint based on this, and designs as necessary. This modeling process allows you to check and modify the design of the custom-made hip before final production, so you can design a more accurate custom-made hip that fits the characteristics of the patient. This can reduce the cost and time lost of the procedure or the pain of the patient. The modification process may be performed by modifying the input design variable again or inputting the selected body design again.

In addition, the modeling is made according to the custom design of the hip joint and the creation of a design drawing is automatically performed. When the design is completed according to the custom design of the hip joint using the program according to the present invention, it is shown in FIG. Likewise, the design drawings required for the actual production of the product are automatically created with the required dimensions, which can shorten the time and process required for the production. As described above, when modification is made to the custom artificial hip joint in the modeling step, the design drawing is automatically modified accordingly.

As described above, the method for designing an on-demand hip joint using a program according to the present invention and a recording medium recording a program for performing the same are designed to fit the characteristics of the individual femur in order to reflect the characteristics of the on-demand hip joint that must meet the characteristics of each patient. Based on the design of the body and the neck and head design that can reflect the exact position of the femoral head and the leg length of the patient, respectively, after modular design and integrated design can increase the accuracy, accurate and rapid design and the patient's femur The correction of the position and leg length of the head can reduce the sequelae and can be applied to special situations such as malformations.

In the above, the Applicant has described preferred embodiments of the present invention, but these embodiments are merely one embodiment for implementing the technical idea of the present invention, and any changes or modifications may be made as long as the technical idea of the present invention is implemented. Should be interpreted as being within the scope.

Figure 1 is a schematic diagram showing a state in which the artificial hip joint

Figure 2 is a schematic diagram showing a state in which the femoral stem for the artificial hip joint and the surgical instrument (rasp) is performed on the femur

Figure 3 is a block diagram of a custom artificial hip design method according to an embodiment of the present invention

Figure 4 is a patient's femur shape information picture

5 is a schematic diagram showing design variables extracted from femoral bone shape information of a patient

Figure 6 is a screen showing the body design database of the femoral stem or surgical instrument

7 is a design variable input screen in the body selection step

8 is a flow chart showing the process of the body selection step

9 is a design variable input screen in the neck and head design stage

10 is a schematic diagram showing a process of integrated design step

11 is a screen showing the confirmation and storage step

12 is a screen showing the modeling custom hip joint

13 is a screen showing a state in which a drawing of an on-demand artificial hip

* Explanation of the main symbols used in the drawings

1: thigh stem 11: body 13: neck 15: head

111: proximal 113: distal

2: femur 21: calculi 23: lumen

3: Acetabular Cup 4: Pelvis 5: Femoral Head 7: Corresponding Hemisphere

9: rasp 91: body 93: neck 95: head

Claims (7)

In order to design a custom hip joint using a program, Body selection step of selecting the body design according to the characteristics of the patient of the body design of the various types of hip joint femoral stem or surgical instrument (rasp) pre-standardized using the design variables; And a neck and head design step of designing a neck and a head suitable for the body design of the femoral stem or a surgical instrument (rasp) selected in the body selection step using design variables. The body selection step is A design variable input step of inputting a design variable; A body design database call step of accessing the body design information of the artificial hip joint femoral stem or the surgical instrument stored in the database; Joining position selection step of placing the body of each femoral stem or surgical instrument to a junction position that can be bonded to the femur of the patient; A comparison and judging step of comparing the design variables inputted through the design variable input step at each joint position with the body design information of the femoral stem or the surgical instrument which is databased; If the value of the body design information of the femoral stem or the surgical instrument is within the range of applying the tolerance to the width of the patient's lumen through the comparison of the comparison judgment step, the body design of the femoral stem or the surgical instrument is selected as a candidate group. Selection candidate group selection step; And a ranking step of classifying the candidate group selected through the selection candidate group classification step into the order of the largest femoral stem or the body of the surgical instrument. The method of claim 1, The design variable used in the body selection step is the width of the lumen of the patient's femur, Design variables used in the neck and head design step is a horizontal length from the center of the femur head to the vertical axis of the femur and the vertical length from the center of the femur head to the small electrons. delete The method of claim 2, Before the body selection step and the neck and head design step Femoral bone shape information obtaining step of obtaining femoral bone shape information of a patient through dicom medical image information by imaging equipment imaging; A design variable extraction step of extracting a design variable from the femur shape information of the patient obtained in the femoral shape information obtaining step; Custom-designed hip joint design method further comprising ;; a body design database construction step of storing the database of the standardized body design of the various types of hip joint femoral stem or surgical instrument (rasp). The method of claim 4, wherein An integrated design step of designing an artificial hip joint or a rasp by integrating the body design selected in the body selection step and the neck and head design designed in the neck and head design step; Custom hip joint design method. The method of claim 5, wherein And a model and drawing creation step for automatically creating a model and a drawing of a hip joint femoral stem or a surgical instrument (rasp) based on the design designed in the integrated design step. A computer-readable recording medium having recorded thereon a program for performing the on-demand hip joint design method according to any one of claims 1, 2 and 4.

Images