CN1453749A - Digitized prepn of artificial implant for personalized nose plastics - Google Patents

Abstract

The invention relates to a digital preparation method of a personalized rhinoplasty artificial implant, which takes the individual patient's facial shape data as the basic design basis, performs visual simulation on the postoperative effect, and directly obtains the digital number of the rhinoplasty implant. Model, the rhinoplasty artificial implant prepared for each patient is all highly accurate and specially-made, and has individualized characteristics, adopts the rhinoplasty artificial implant that the method of the present invention makes can be implanted in the body, and intraoperative There is no need for manual carving or only a very small part of modification, which can greatly shorten the operation time and reduce the patient's pain. The postoperative shape is very similar to the computer simulation effect, which can meet the patient's expectations for the implantation effect to the greatest extent.

Description

A digital preparation method of personalized rhinoplasty artificial implant

technical field

The invention relates to a preparation method of an artificial implant for facial rhinoplasty, in particular to a digital preparation method for applying digital technology to a personalized artificial implant for rhinoplasty.

Background technique

Rhinoplasty artificial implants are one of the most commonly used human implant materials in plastic and cosmetic surgery. They are widely used in cosmetic surgery to improve the shape of the nose, and to correct nasal depression deformities caused by trauma, infection, tumors and congenital factors. .

At present, the main types of rhinoplasty implants are as follows:

1. Formed silicone rubber artificial rhinoplasty prosthesis: it is the most widely used rhinoplasty implant at present.

2. Formed polyethylene artificial rhinoplasty prosthesis: produced by American POREX Company. It adopts a fixed model design, and its product appearance is quite different from that of Chinese patients. The cost is expensive, which is 5 times of the current operation cost, which is often unaffordable for Chinese patients. Because it is made of polyethylene material, it has high hardness and insufficient elasticity.

3. Autologous costal cartilage: the patient's own or allogeneic costal cartilage is cut, carved and trimmed into shape. Due to the need to remove the costal cartilage, it will cause additional damage and pain to the patient, and the source of materials is limited, so there will be a certain degree of long-term absorption and deformation.

In addition, methods such as the use of processed xenogeneic cartilage have also been reported, but they are rarely used due to problems such as immune reactions and deformation.

The common shortcoming that above-mentioned method exists is:

1. Regardless of whether it is a molded product or not, it cannot fully conform to the anatomical shape of each patient's nose, so the surgeon needs to carry out further specific processing and carving according to the actual situation of the patient during the operation; the individualization of the implant cannot be realized preparation.

2. The patient cannot predict the shape of the implant and the surgical effect before the operation. The result of the operation depends entirely on the doctor's aesthetics and carving skills, which is difficult to meet the individual needs of the patient.

3. Due to the need for intraoperative engraving, the operation time is longer.

4. Since the inner surface of the rhinoplasty implant carved by the doctor is difficult to completely match the anatomical shape of the implant level, the implant may be displaced due to poor retention after surgery, affecting the surgical effect or causing a second operation.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies and defects of the prior art, adopt advanced digital technology, and provide a digital preparation method of a personalized rhinoplasty artificial implant that conforms to the patient's facial anatomy and the patient's desired shape effect.

In order to achieve the above object, the present invention provides a digital preparation method of a personalized rhinoplasty artificial implant, comprising steps:

1) Obtain the three-dimensional raw data of the patient's head shape;

2) performing three-dimensional reconstruction on the three-dimensional original data of the patient's head shape to obtain three-dimensional solid digital models of the patient's head and face appearance;

3) Transform the nasal surface shape of the 3D solid digital model into a 3D curved surface and carry out digital editing, processing and modification, and then fit it with the original 3D solid digital model of the head and face appearance to simulate the post-operative effect until the patient is satisfied , the degree to which the operation is feasible;

4) Comparing the modified three-dimensional solid digital model of the nose with the original three-dimensional solid digital model of the head and face of the patient to obtain a digital model of the nasal implant in the modified part of the three-dimensional space;

5) Properly adjust the modified part of the digital model of the nasal implant in three-dimensional space according to the correction parameters, so as to become a three-dimensional solid digital model of the rhinoplasty implant;

6) Carry out digital molding process design on the three-dimensional solid digital model of the rhinoplasty implant;

7) Preparation of personalized rhinoplasty artificial implants.

The source of the three-dimensional raw data in step 1) is selected from CT, MRI and three-dimensional laser scanning.

The step 5) may further include: adding a columella support to the front end of the digital model of the rhinoplasty implant if necessary.

The step 7) further includes: using rapid prototyping technology to manufacture biomedical materials in layers, so as to directly obtain personalized rhinoplasty artificial implants.

The step 7) is further as follows: use the numerical control software to generate the numerical control code of the three-dimensional solid digital model of the rhinoplasty implant that is finally designed, input the numerical control code into the numerical control equipment to make a mold, and then use the mold to make the biomedical material into a personalized Rhinoplasty artificial implants.

The rapid prototyping technology is selected from light-solid rapid prototyping, layered entity manufacturing rapid prototyping, fused deposition rapid prototyping, selective laser sintering rapid prototyping and three-dimensional printing rapid prototyping.

The biomedical material is selected from medical silicone rubber, polyurethane, polyethylene, hydroxyapatite, polytetrafluoroethylene and acellular allogeneic dermis powder.

The shape of the personalized rhinoplasty artificial implant in the step 7) is selected from the L-shaped rhinoplasty artificial implant comprising a columella support, the willow leaf-shaped rhinoplasty artificial implant that does not contain a columella support. Implants, as well as any shape artificial implants for rhinoplasty according to the actual needs of patients.

The personalized rhinoplasty artificial implant made by the method of the present invention can be permanently implanted in the body, and compared with the traditional molding rhinoplasty implant, it has the following advantages:

1. Be faithful to the prototype and realize the precise preparation of computer design;

2. Patients can predict the surgical effect before the operation, and decide the shape of their nose according to their personal wishes;

3. There is no need for manual carving or only a very small part of modification during the operation, which can greatly shorten the operation time and reduce the pain of patients;

4. The postoperative appearance is very similar to the computer simulation effect, which minimizes the influence of human factors on the surgical effect.

Description of drawings

Fig. 1 is a process flow diagram of a digital preparation method for a personalized rhinoplasty artificial implant.

Detailed ways

The specific implementation manner of the present invention will be described in detail below in conjunction with the accompanying drawings and examples.

Embodiment one

An embodiment of preparing the individualized rhinoplasty artificial implant according to the method of the present invention may further comprise the steps:

1. Use CT scanning to obtain the original three-dimensional data of the patient's face.

2. Reconstruct the CT slice file to obtain a three-dimensional solid digital model of the patient's facial shape.

3. Necessary screening and segmentation of the three-dimensional solid digital model, digital editing, processing and modification of the surface shape of the nose, and computer simulation of the postoperative effect until the patient is satisfied and the operation is feasible;

4. Comparing the modified three-dimensional solid digital model of the nose with the original three-dimensional solid digital model of the patient's head and face, obtaining a solid digital model of the modified part of the three-dimensional space;

5. Properly adjust the modified part of the physical digital model in three-dimensional space according to the correction parameters, and design a columella support at the front end of the digital model of the rhinoplasty implant to generate a three-dimensional solid digital model of the rhinoplasty implant;

6. Design and process the mold, design the mold shape, parting surface, and positioning holes along the edge of the model;

7. Plan the processing route and compile the NC code;

8. Send the CNC code to the high-precision processing equipment;

9. High-precision processing equipment processes production molds on metal mold raw materials according to numerical control instructions;

10. Using the obtained mold, using medical silicone rubber as raw material, a personalized rhinoplasty silicone implant was prepared according to a conventional production process.

Embodiment two

Another embodiment of preparing the individualized rhinoplasty artificial implant according to the method of the present invention comprises the following steps:

1. Obtain three-dimensional data of the patient's face by CT scanning.

2. Reconstruct the CT slice file to obtain a three-dimensional solid digital model of the patient's facial shape.

3. Necessary screening and segmentation of the three-dimensional solid digital model, digital editing, processing and modification of the surface shape of the nose, and computer simulation of the postoperative effect to achieve the satisfaction of the patient and the feasibility of the operation;

4. Comparing the modified three-dimensional solid digital model of the nose with the original three-dimensional solid digital model of the patient's original head and face, obtaining the solid digital model of the modified part of the three-dimensional space;

5. Properly adjust the modified part of the physical digital model in three-dimensional space according to the correction parameters, and design a columella support at the front end of the digital model of the rhinoplasty implant to generate a three-dimensional solid digital model of the rhinoplasty implant;

6. Place the digital model of the final designed rhinoplasty implant processing mold horizontally, and layer it along the height direction with a layer thickness of 0.3mm to obtain the two-dimensional graphics of each layer;

7. Plan the processing path of the two-dimensional graphics obtained by layering, and compile the NC code.

8. Input the CNC code of each layer of two-dimensional graphics into the rapid prototyping equipment according to the program;

9. Using medical polyurethane as the raw material, the rapid prototyping equipment stacks the material in layers according to the input numerical control code, and directly obtains the personalized polyurethane implant for rhinoplasty.

In addition to the above-mentioned embodiments, the above-mentioned method can be used to digitally prepare the personalized rhinoplasty artificial implants involved in facial deformity repair and plastic surgery, and the postoperative effect will be evaluated based on the individual facial shape data of the patient. Visibility simulation, and directly obtain the digital model of the implant, and apply digital programs and equipment to tailor a highly accurate and personalized rhinoplasty artificial implant for each patient. The rhinoplasty artificial implant prepared by the method of the present invention can be implanted in the body, and no manual carving or only a very small part of modification is required during the operation, which can greatly shorten the operation time and reduce the pain of the patient. The effects are very similar, and the patient's expectations for implantation effects are met to the greatest extent.

Claims (8)

1. A digital preparation method of a personalized rhinoplasty artificial implant, characterized in that, comprising the steps: 1) Obtain the three-dimensional raw data of the patient's head shape; 2) performing three-dimensional reconstruction on the three-dimensional original data of the patient's head shape to obtain three-dimensional solid digital models of the patient's head and face appearance; 3) Transform the nasal surface shape of the 3D solid digital model into a 3D curved surface and carry out digital editing, processing and modification, and then fit it with the original 3D solid digital model of the head and face appearance to simulate the post-operative effect until the patient is satisfied , the degree to which the operation is feasible; 4) Comparing the modified three-dimensional solid digital model of the nose with the original three-dimensional solid digital model of the head and face of the patient to obtain a digital model of the nasal implant in the modified part of the three-dimensional space; 5) Properly adjust the modified part of the digital model of the nasal implant in three-dimensional space according to the correction parameters, so as to become a three-dimensional solid digital model of the rhinoplasty implant; 6) Carry out digital molding process design on the three-dimensional solid digital model of the rhinoplasty implant; 7) Preparation of personalized rhinoplasty artificial implants. 2. The digital preparation method of the individualized rhinoplasty artificial implant according to claim 1, wherein the source of the three-dimensional raw data in the step 1) is selected from CT, MRI and three-dimensional laser scanning. 3. The digitized preparation method of the personalized rhinoplasty artificial implant according to claim 1, characterized in that, described step 5) may further comprise: when necessary, the front end of the rhinoplasty implant digital model can be added Nasal columella support. 4. the digitized preparation method of personalized rhinoplasty artificial implant according to claim 1, is characterized in that, described step 7) is further: adopt rapid prototyping process to carry out layered manufacturing of biomedical materials, thereby directly Get personalized rhinoplasty artificial implants. 5. the digitized preparation method of personalized rhinoplasty artificial implant according to claim 1, is characterized in that, described step 7) is further: the three-dimensional entity digital model of the rhinoplasty implant that final design completes Use numerical control software to generate numerical control codes, input numerical control codes into numerical control equipment to make molds, and then use the molds to make personalized rhinoplasty artificial implants from biomedical materials. 6. the digitized preparation method of individualized rhinoplasty artificial implant according to claim 4, is characterized in that, described rapid prototyping technology is selected from light-solid rapid prototyping, layered entity manufacturing rapid prototyping, fused deposition rapid prototyping , Choose laser sintering rapid prototyping and 3D printing rapid prototyping. 7. according to the digitized preparation method of the individualized rhinoplasty artificial implant described in claim 4 or 5, it is characterized in that, described biomedical material is selected from medical silicone rubber, polyurethane, polyethylene, hydroxyapatite, Teflon and Acellular Allodermal Powder. 8. The digital preparation method of the individualized rhinoplasty artificial implant according to claim 1, characterized in that, the shape of the individualized rhinoplasty artificial implant in the described step 7) is selected from the group consisting of nasal columella L-shaped artificial implants for rhinoplasty with supports, willow-shaped artificial implants for rhinoplasty without columella supports, and artificial implants for rhinoplasty with arbitrary shapes according to the actual needs of patients.