CN101530354A - Digital data design method of joint local surface implant - Google Patents

Abstract

A method of digital data design for a partial articular surface implant, comprising: a) acquiring digital data of a joint to be implanted: carrying out digital scanning on a joint to be implanted of a patient to obtain digital data of the joint to be implanted; b) defining a repair area and a reserved area: dividing the digital data of the joint to be implanted into two areas, respectively defining, defining the cut area to be cut off as a repair area, and defining the residual area after cutting off as a reserved area; and c) establishing digital data of the implant: selecting characteristics and/or self-constructing guide characteristics of the repaired area and defining the characteristics as reference data, generating a curved surface shape which can cover the outline of the repaired area by matching with the digital data of the reserved area and processing the curved surface shape through mathematical operation, and cutting and adjusting the curved surface shape to ensure that the curved surface shape conforms to the size of the repaired area and is defined as the digital data of an implant.

Description

Digital Data Design Method for Partial Joint Surface Implants

technical field

The invention relates to the manufacturing technology of artificial joints, in particular to a digital data design method for local joint surface implants.

Background technique

Press, in the design field of medical engineering human implants, at present most of the whole joint is replaced, so the overall design direction is mostly designed towards the structure and function of the whole joint. However, most of the joint damage is only localized. Therefore, when a total joint replacement is performed on a partially damaged joint, some healthy joints will also be replaced at the same time. Total artificial joint surgery is complicated, the wound is large, and the recovery of the patient is slow. In addition, if the artificial joint needs to be replaced again due to wear or disease in the future, more complicated surgery and treatment are often required.

Nowadays, when performing joint replacement, partial surface replacement technology has become a trend. Its advantage is that patients only need to remove a small amount of bone in the affected area to achieve the therapeutic effect. As far as the surface of the implant used in partial surface replacement is concerned, it is designed by the designer himself using one or more sets of software, and most of the standardized implants are used for design. It does not refer to the patient's own digital bone data, that is, in terms of implant design, most of them are standard product designs, and therefore cannot meet the design requirements of customized implants. The possible disadvantage of this method is that after the partial surface implant is assembled in the human body, it does not match well with the unresected bone.

Contents of the invention

The purpose of the present invention is to provide a digital data design method for local joint surface implants, which can meet the requirements of customization.

Another object of the present invention is to provide a digital data design method for partial joint surface implants, which can achieve a better matching degree with the patient's unresected bone.

In order to achieve the above purpose, the digital data design method of the local joint surface implant provided by the present invention includes the following steps: a) Obtaining the digital data of the joint to be implanted: digitally scanning the patient's joint to be implanted, so as to Obtain the digital data of the joint to be implanted; b) define the repair area and the reserved area: divide the digital data of the joint to be implanted into two areas, and define them separately, and define the resected area that needs to be removed as the repair area. The remaining area after is defined as a reserved area, and the point data at the intersection of the aforementioned two areas is used to generate a curve as the boundary contour curve of the implant; and c) establish digital data of the implant: select features and define the repair area As a reference data, combined with the digital data of the reserved area, after mathematical operation processing, a curved surface shape that can cover the contour of the repaired area is generated, and the surface shape is trimmed and adjusted by using the boundary contour curve of the implant. Make it conform to the size of the repaired area and define it as the digital data of an implant. In this way, customized requirements can be achieved, and a better matching degree can be achieved with the unresected bone of the patient.

In other words, the digital data design method of the local joint surface implant provided by the present invention includes the following steps:

a) Obtain the digital data of the joint to be implanted: digitally scan the patient's joint to be implanted to obtain the digital data of the joint to be implanted;

b) Define the repair area and the reserved area: divide the digital data of the joint to be implanted into two areas, and define them separately, define the excised area that needs to be cut off as the repair area, and define the remaining area after the removal as the reserved area, Generating a curve using the point data at the junction of the aforementioned two regions as the boundary contour curve of the implant; and

c) Establish digital data of the implant: select features and/or self-construct guide features for the repaired area and define them as reference data, and then cooperate with the digital data of the reserved area to generate a possible The curved surface shape covering the outline of the repaired area is trimmed and adjusted by using the boundary contour curve of the implant so that it conforms to the size of the repaired area, and is defined as digital data of an implant.

The digital data design method of the local joint surface implant, wherein, in step c), use the digital data of the reserved area to cooperate with the computer interface to extract or generate relevant auxiliary data to generate the implant. digital data.

The digital data design method of the local joint surface implant, wherein, in step b): when defining the repair area and the reserved area, it is obtained by using geometric data such as points, lines, and surfaces; wherein the lines include curves , straight lines, and arcs, while surfaces include planes, curved surfaces, spherical surfaces, and cylindrical surfaces.

The digital data design method of the partial joint surface implant, wherein, in step c): the bottom surface of the digital data of the implant matches the top surface of the reserved area.

The digital data design method of the local joint surface implant, wherein, in step c): when constructing the guide feature by itself, construct the guide feature that does not exist on the repaired area, and generate auxiliary features .

Description of drawings

Fig. 1 is a flowchart of the steps of a preferred embodiment of the present invention.

Fig. 2 is a schematic diagram of a preferred embodiment of the present invention, showing the digital data of the joint to be implanted.

Fig. 3 is a partially enlarged view of the joint to be implanted in Fig. 2 .

FIG. 4 is a schematic diagram of a preferred embodiment of the present invention, showing the state that the repaired area is separated from the reserved area.

Fig. 5 is a schematic diagram of a preferred embodiment of the present invention, showing the forming state of the curved surface shape.

Fig. 6 is a schematic diagram of a preferred embodiment of the present invention, showing the outline of the implant.

Explanation of main component symbols in the attached drawings:

11 Digital data of the joint to be implanted

12 patched areas

14 reserved areas

16 Implant Boundary Contour Curves

19 planes

21 surface shape

22 Digital data for implants

Detailed ways

In order to describe the technical features of the present invention in detail, the following preferred embodiment is given and described as follows in conjunction with the accompanying drawings, wherein:

As shown in Figure 1, a digital data design method of a local joint surface implant provided by a preferred embodiment of the present invention mainly has the following steps:

a) Obtain digital data of the joint to be implanted: digitally scan the patient's joint to be implanted to obtain the digital data 11 of the joint to be implanted, as shown in FIG. 2 . During digital scanning, multiple digital 2D images can be obtained through computerized tomography (CT) or computerized magnetic resonance (MRI).

b) Define repair area and reserved area: as shown in Figure 3 to Figure 4, the digital data 11 of the joint to be implanted is divided into two areas and defined, and the resected area that needs to be removed is defined as the repair area 12, The remaining area after excision is defined as reserved area 14 . When defining the aforementioned two regions, geometric data such as points, lines, and planes are used to define them. Lines include curves, straight lines, and arcs, and surfaces include planes, curved surfaces, spherical surfaces, and cylindrical surfaces. As shown in FIG. 3 , in this example, a plane 19 is used as the cutting plane when distinguishing, and the repair area 12 is defined above the plane 19 , and the reserved area 14 is defined below. At the same time, a curve is generated by using the point data at the junction of the two regions as the boundary contour curve 16 of the implant.

c) Establishing the digital data of the implant: selecting features and/or self-constructed guiding features for the repaired area 12 and defining them as reference data, and then cooperating with the digital data of the reserved area 14, and processing them through mathematical operations to generate A curved shape 21 can cover the outline of the repaired area 12, as shown in FIG. 5 . Thereafter, the curved surface profile 21 is clipped by using the previously obtained implant boundary profile curve 16 to obtain the curved surface profile 21, making it conform to the size of the repaired area 12, and defining it as digital data 22 of an implant ,As shown in Figure 6. Wherein the bottom surface of the digital data 22 of the implant coincides with the top surface of the reserved area 14, thus having a better matching degree. In addition, the digital data of the reserved area 14 can also be used to cooperate with computer interface operations to extract or generate relevant auxiliary data (such as generating guide curves) to generate a curved surface shape 21 covering the outline of the repaired area 12, so as to obtain the implantation. digital data of objects22. In this step, when constructing the guide feature by itself, the guide feature that does not exist in the repair area 12 is constructed to generate auxiliary features, so that when it is difficult to select the feature, the feature can be established in an external way .

Through the above steps, the digital data 22 of the implant to be implanted can be generated for subsequent materialized production, and then a physical implant to be implanted (not shown in the figure) can be produced. Since the implant to be produced is established based on the patient's own joint shape, customized effects can be achieved.

It is worth mentioning that the digital data in the repaired area 12 and the reserved area 14 also have other uses. The digital data of the repaired area 12 can be used as the basis for truly restoring the original bone shape of the human body, and the digital data of the reserved area 14 can be used as a reference for the degree of fit between the surface of the implant and the outline of the retained bone during assembly, Or the interpretation of the relationship with the geometric continuity of the implant surface.

It can be seen from the above that the digital data of the implant designed by the present invention can meet the requirements of customization after materialization, and can achieve a better matching degree with the unresected bone of the patient.

Claims (5)

1. A digital data design method for local joint surface implants, comprising the following steps: a) Obtain the digital data of the joint to be implanted: digitally scan the patient's joint to be implanted to obtain the digital data of the joint to be implanted; b) Define the repair area and the reserved area: divide the digital data of the joint to be implanted into two areas, and define them separately, define the excised area that needs to be cut off as the repair area, and define the remaining area after the removal as the reserved area, Generating a curve using the point data at the junction of the aforementioned two regions as the boundary contour curve of the implant; and c) Establish digital data of the implant: select features and/or self-construct guide features for the repaired area and define them as reference data, and then cooperate with the digital data of the reserved area to generate a possible The curved surface shape covering the outline of the repaired area is trimmed and adjusted by using the boundary contour curve of the implant so that it conforms to the size of the repaired area, and is defined as digital data of an implant. 2. The digital data design method of the partial joint surface implant according to claim 1, wherein, in step c): use the digital data in the reserved area to cooperate with computer interface operations to extract or generate relevant auxiliary data to Digital data for the implant is generated. 3. The digital data design method of the local joint surface implant according to claim 1, wherein, in step b): when defining the repair area and the reserved area, geometric data such as points, lines, and surfaces are used to define Obtained; where lines include curves, straight lines, and arcs, and surfaces include planes, curved surfaces, spherical surfaces, and cylindrical surfaces. 4. The digital data design method of the partial joint surface implant according to claim 1, wherein in step c): the bottom surface of the digital data of the implant matches the top surface of the reserved area. 5. The digital data design method for local joint surface implants according to claim 1, wherein, in step c): when constructing guiding features by itself, constructing guiding features that do not exist in the repaired area , resulting in auxiliary features.

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