CN114073606B - Simulation bone cutting system - Google Patents
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- CN114073606B CN114073606B CN202210012243.1A CN202210012243A CN114073606B CN 114073606 B CN114073606 B CN 114073606B CN 202210012243 A CN202210012243 A CN 202210012243A CN 114073606 B CN114073606 B CN 114073606B
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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
- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
- A61F2/4684—Trial or dummy prostheses
-
- 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
- A61F2/38—Joints for elbows or knees
- A61F2/3859—Femoral components
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
- G06T17/20—Finite element generation, e.g. wire-frame surface description, tesselation
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/28—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for medicine
-
- 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
- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
- A61F2002/4632—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor using computer-controlled surgery, e.g. robotic surgery
- A61F2002/4633—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor using computer-controlled surgery, e.g. robotic surgery for selection of endoprosthetic joints or for pre-operative planning
Abstract
The invention belongs to the technical field of medical treatment, and particularly discloses a bone cutting simulation method, which comprises the following steps: preparing a joint prosthesis model and a bone model of a bone to be simulated; constructing a bone cutter model by taking the joint prosthesis model as a modeling reference; aligning the coordinate system of the osteotomy model with the coordinate system of the bone model; and based on Boolean operation, adopting the bone cutter model to cut bones of the bone model. The simulation bone cutting method disclosed by the invention can improve the bone cutting efficiency and the bone cutting effect, thereby improving the data accuracy of the bone cutting surface after bone cutting.
Description
Technical Field
The invention belongs to the technical field of medical treatment, and particularly relates to a bone cutting simulation system.
Background
At present, the total knee joint replacement operation is a common method for treating osteoarthropathy clinically, and the diseased osteoarthropathy is replaced by a joint prosthesis, so that the knee joint function can be effectively improved, the pain of a patient is relieved, and the life quality is improved.
In the case of performing a total knee replacement operation, it is necessary to remove a predetermined amount of hard tissue from the knee joint using a bone cutter, and then fix the knee joint prosthesis to the remaining bone to replace the removed hard tissue, whereby the accuracy of hard tissue resection using the bone cutter directly determines the degree of matching between the remaining bone tissue and the knee joint prosthesis and the success rate of the operation. In order to improve the operation precision, a bone cutting simulation mode needs to be adopted before the operation is carried out, and the data of the bone cutting surface is acquired so as to provide positioning for the actual bone cutting operation of the bone cutting robot.
The existing knee bone model cutting method is a bone cutting method based on a preset plane, and based on 6 planes originally selected according to a knee joint prosthesis, a position corresponding to a bone model is found through coordinate conversion, and cutting is carried out according to the knee joint prosthesis model by dividing the knee joint prosthesis model into two parts by taking the plane as a reference.
However, the simulated bone cutting method has a great defect, and the main reasons are as follows: firstly, the method needs to calculate the normal vector and the base point of the osteotomy plane for each type of prosthesis, and cannot realize the operation of calculating the curved surface generated in the clinical process; secondly, the method is complicated in preparation work, each bone cutting plane of each knee joint prosthesis needs to be independently operated, and the method is only suitable for scenes with a small number of bone cutting planes.
Disclosure of Invention
The invention aims to provide a bone cutting simulation system, which improves the bone cutting simulation efficiency, reduces the workload of bone cutting simulation and improves the bone cutting simulation effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
a simulated bone cutting system comprising:
the model preparation module is used for preparing a joint prosthesis model and a bone model of a bone to be simulated;
the modeling module is used for constructing a bone cutter model according to the joint prosthesis model;
a coordinate transformation module for making the coordinate system of the osteotomy model consistent with the coordinate system of the bone model;
the model preparation module can also acquire data of the constructed osteotomy model, and the Boolean budget module is used for cutting bones of the bone model by adopting the osteotomy model based on a Boolean algorithm;
the modeling module is capable of modeling based on the prosthesis model as follows:
extracting an inner concave side contour line of a main body of the joint prosthesis model under a side view angle;
drawing an external expansion contour line positioned on the outer side of the concave side contour line, and connecting the external expansion contour line with the concave side contour line to form a closed sketch contour, wherein the sketch contour wraps the contour of the main body;
and performing stretching modeling based on the sketch outline to form a stretching model, wherein the stretching length of the stretching model is greater than that of the joint prosthesis model.
As an optional technical solution for simulating the bone cutting system, constructing the bone cutter model further comprises:
extracting an outer convex side contour line of a main body of the joint prosthesis model under a side view;
expanding the convex side contour line away from the concave side contour line to form an expanded contour line.
As an alternative to simulating a bone cutting system, the joint prosthesis model has an intercondylar boss, and constructing the osteotomy model further comprises: and constructing an intercondylar osteotomy boss which is consistent in shape and position with the intercondylar boss on the stretching model.
As an optional technical solution for simulating a bone cutting system, the concave side of the joint prosthesis model has a positioning column, and constructing the bone cutter model further includes: and constructing a drilling column which is consistent with the positioning column in appearance and is superposed with the positioning column in position on the tensile model.
As an optional technical solution for simulating a bone cutting system, the performing bone cutting on the bone model based on boolean operation specifically includes:
compiling a simulation bone cutting program, wherein the simulation bone cutting program comprises the reading of the bone model data, the reading of the bone cutter model and an inter-model Boolean operation algorithm;
reading the data of the bone model and the data of the osteotomy device model through the simulation osteotomy program, and performing osteotomy operation;
obtaining the bone model after bone cutting;
and extracting the bone cutting surface data.
As an optional technical solution for simulating a bone cutting system, the performing bone cutting on the bone model based on boolean operation specifically includes:
importing the bone model data and the osteotomy model into a same modeling interface;
using the osteotome model to resect a portion of material of the bone model based on a built-in algorithm in modeling software;
and extracting the bone cutting surface data.
As an optional technical solution for simulating the bone cutting system, the step of making the coordinate system of the bone cutter model and the coordinate system of the bone model consistent specifically comprises: in preparing the joint prosthesis model, the joint prosthesis model data is converted to data in the bone model coordinate system.
As an optional technical solution for simulating the bone cutting system, the step of making the coordinate system of the bone cutter model and the coordinate system of the bone model consistent specifically comprises: after the bone cutter model is built, converting the data of the bone cutter model into the data in the bone model coordinate system.
As an optional technical solution for simulating the bone cutting system, the step of making the coordinate system of the bone cutter model and the coordinate system of the bone model consistent specifically comprises:
converting the bone model data into model data under a set coordinate system;
when preparing the joint prosthesis model, converting the joint prosthesis model data into data under the set coordinate system; or after the bone cutter model is constructed, converting the data of the bone cutter model into the data in the set coordinate system.
The invention has the beneficial effects that:
according to the bone cutting simulation system provided by the embodiment, the bone cutting device model is constructed in the joint prosthesis model, so that the joint prosthesis model and the bone cutting device model can be ensured to be in the same coordinate system, the effect that the joint prosthesis and the bone cutting surface are completely overlapped after bone cutting operation can be achieved, the calculation amount of the space coordinate system conversion step between the joint prosthesis model and the bone cutting device model is saved, and the bone cutting simulation efficiency is improved. Meanwhile, the bone model is cut by adopting the bone cutter model through Boolean operation, so that the bone cutting efficiency can be effectively improved, and more accurate bone cutting surface data can be obtained. Meanwhile, the simulation osteotomy system has universality on different types of joint prosthesis models, the number of the osteotomy surfaces is not limited, the osteotomy surfaces are not limited to be planes, and the universality is high.
Drawings
FIG. 1 is a flow chart of a method for simulating bone cutting according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a joint prosthesis model provided by an embodiment of the invention;
FIG. 3 is a schematic flow chart of the process for constructing the osteotomy model provided by the embodiment of the present invention;
fig. 4 is a schematic structural diagram of a bone model after bone cutting according to an embodiment of the present invention.
The figures are labeled as follows:
1. a joint prosthesis model; 11. an intercondylar boss; 12. a bone-engaging surface; 13. a positioning column;
2. a bone cutter model; 21. intercondylar osteotomy boss; 22. cutting bone action surface; 23. drilling a hole column;
3. a bone model; 31. an intercondylar recess; 32. cutting a bone plane; 33. and (7) positioning the holes.
101. A concave side contour line; 102. a convex side contour line; 103. and (4) outward expansion contour lines.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
As shown in fig. 1, the present embodiment provides a simulated bone cutting system for performing a simulated bone cutting method. The simulation bone cutting system comprises a model preparation module, a modeling module, a coordinate conversion module and a Boolean operation module, wherein the model preparation module is used for obtaining a joint prosthesis model and a bone model of a bone to be simulated, and the modeling module is used for constructing a bone cutter model according to the joint prosthesis model; the coordinate transformation module is used for enabling the coordinate system of the osteotomy model to be consistent with the coordinate system of the bone model; the Boolean budget module is used for cutting bones of the bone model by adopting the bone cutter model based on Boolean algorithm.
The bone cutting simulation method provided by the embodiment specifically comprises the following steps:
as shown in fig. 1 and 2, step S1, preparing a joint prosthesis model 1 and a bone model 3 to be simulated for bone cutting;
preparing a joint prosthesis model mainly comprises the following steps of constructing a virtual joint prosthesis model 1:
step S11, selecting the model of the joint prosthesis according to the actual requirement according to the joint characteristics of the patient;
since the joint characteristics of each patient are different, in order to obtain a good surgical effect, a suitable joint prosthesis needs to be selected for each patient's situation.
Joint prostheses are typically selected based on the market's existing joint prosthesis model.
In this embodiment, the joint prosthesis is in particular a femoral prosthesis.
Step S12, preparing prosthesis modeling data of the selected joint prosthesis model by adopting a model preparation module;
usually, the prosthesis modeling data of the joint prosthesis is directly provided by a manufacturer, so that the generated joint prosthesis model 1 has small difference with an actual joint prosthesis product and high modeling precision. In a special case, the prosthesis modeling data of the joint prosthesis model 1 may be obtained based on data measurements of the selected joint prosthesis entity product.
S13, according to the obtained prosthesis modeling data, a modeling module builds a joint prosthesis model 1 in modeling software;
the joint prosthesis model 1 can be constructed in the existing known three-dimensional modeling software, such as UG, SolidWorks, Creo and the like. And constructing a three-dimensional model according to the modeling data is a common technical means in the field, and is not described herein again.
As shown in fig. 2, in the present embodiment, the joint prosthesis model 1 includes a body and an intercondylar boss 11 disposed at the concave side of the body, and bone attachment surfaces 12 are disposed at two sides of the intercondylar boss 11 at the concave side of the body, wherein the intercondylar boss 11 is adapted to the intercondylar notch of the femur, and the intercondylar boss 11 can improve the microbial sealing property, and has better connection strength and structural stability, so that the patient is not easy to fracture. The bone-adhering surface 12 is used for adhering to the osteotomy surface after osteotomy. In order to improve the positioning accuracy between the joint prosthesis and the femur, in this embodiment, the bone attachment surface 12 is further provided with positioning pillars 13 vertically protruding, and the positioning pillars 13 are respectively provided on two opposite sides of the intercondylar boss 11.
It is understood that the use of the simulated bone cutting method provided by the present embodiment is not limited to the joint prosthesis model 1 in fig. 2, and the present embodiment has versatility for existing joint prosthesis models 1 of various models and structures, that is, in other application scenarios, the joint prosthesis model 1 may not have the intercondylar boss 11 or the positioning column 13, and the present embodiment does not limit the specific structure of the joint prosthesis model 1.
In the present embodiment, since the bone cutting operation is generally performed on the lower end of the femur, in the present embodiment, the bone model 3 in the prepared bone model 3 refers to a femur model constructed in three-dimensional software, and the bone model 3 data refers to modeling data capable of constructing the generated bone model 3 in modeling software.
S2, constructing a bone cutter model 2 by the modeling module by taking the joint prosthesis model 1 as a modeling standard;
as shown in fig. 3, in the present embodiment, the construction of the osteotomy model 2 mainly includes the following steps:
step S21, extracting contour lines of a main body of the joint prosthesis model 1 in a side view, wherein the contour lines comprise an inner concave side contour line 101 and an outer convex side contour line 102;
step S22 is to expand the outer convex contour line 102 away from the inner concave contour line 101 to form the flared contour line 103 while keeping the inner concave contour line 101 unchanged.
Step S23, connecting the concave side contour line 101 and the outward expansion contour line 103 to form a closed sketch contour surrounding the main body contour;
since the size of the joint prosthesis model 1 is smaller than that of the bone model 3, if the osteotomy instrument model 2 is constructed only with the main body contour line of the joint prosthesis model 1, there is a problem that the surface of the bone model 3 cannot be completely resected, thereby affecting the bone cutting effect. In this embodiment, the concave side contour line 101 is kept unchanged, and the convex side contour line 102 and the contours at the two ends are expanded outwards, so that the problems that the cutting structure of the bone model 3 is incomplete and the cutting result is residual can be effectively solved on the premise that the inner side surface of the osteotomy device model 2 is completely overlapped with the concave side surface of the joint prosthesis model 1, and the cutting precision and the cutting effect are ensured.
In this embodiment, the flared contour 103 is formed by expanding the outer convex contour 102 outward, but in other embodiments, the flared contour 103 located on the outer side of the joint prosthesis model 1 may be directly drawn, as long as the flared contour 103 is located on the outer side of the concave contour 101, and the sketched contour formed by the flared contour 103 and the concave contour 101 includes the main body contour.
S24, performing stretching modeling based on the sketch outline to form a stretching model;
stretching is a conventional step of generating a solid model based on sketch in three-dimensional modeling, and is not described herein again.
In order to ensure the bone cutting effect, the length of the lateral stretching is larger than the width of the joint prosthesis and the width of the bone to be cut.
Step S25, forming the osteotomy model 2 based on the axial side view of the joint prosthesis model 1, supplementing the detailed structure.
In this embodiment, step S25 specifically includes:
step S251, constructing an intercondylar osteotomy boss 21 which is consistent in shape and coincident in position with the intercondylar boss 11 on the stretching model;
step S252 is to construct the drilled column 23 on the tensile model, which is identical in shape and position to the positioning column 13.
However, it is understood that the operation of step S25 may not be performed when the joint prosthesis model 1 does not have the intercondylar boss 11 and the positioning post 13, and that only one of step S251 or step S252 may be selected to be performed when the joint prosthesis model 1 has only the intercondylar boss 11 or the positioning post 13.
Step S26, the model preparation module extracts the data of the osteotomy model 2;
step S3, the Boolean operation module performs bone cutting on the bone model 3 by adopting the bone cutter model 2 based on Boolean algorithm to obtain a bone cutting surface;
before the bone cutting, a coordinate conversion module is needed to be adopted to enable the coordinate system of the bone cutter model 2 to be consistent with the coordinate system of the bone model 3, and then Boolean calculation can be carried out in the subsequent process.
In the present embodiment, matching the coordinate system of the osteotomy model 2 with the coordinate system of the bone model 3 specifically includes: when preparing the joint prosthesis model 1, the joint prosthesis model 1 data is converted into data in the bone model 3 coordinate system.
Because the coordinate systems of the joint prosthesis model 1 and the osteotomy model 2 are consistent, the coordinate system of the joint prosthesis model 1 is converted into the coordinate system of the bone model 3 before the osteotomy model 2 is constructed, so that the coordinate system of the constructed osteotomy model 2 and the coordinate system of the bone model 3 can be ensured to be consistent. This coordinate conversion method can simplify the operation of coordinate conversion.
In other embodiments, the matching of the coordinate system of the osteotomy model 2 with the coordinate system of the bone model 3 specifically comprises: after the bone cutter model 2 is constructed, the data of the bone cutter model 2 is converted into data in the bone model 3 coordinate system. Compared with the simulation bone cutting operation in the prior art, the method is directly applicable to the coordinate conversion of the later-stage joint prosthesis model 2 after the algorithm and the conversion matrix required by the bone cutting device model 2 for converting the coordinate system are determined, the program and the conversion matrix for the later-stage joint prosthesis model coordinate conversion do not need to be determined again, and the simulation efficiency can be improved in comparison with the prior art.
In yet other embodiments, reconciling the coordinate system of the osteotome model 2 with the coordinate system of the bone model 3 specifically comprises:
converting the data of the bone model 3 into model data under a set coordinate system;
when preparing the joint prosthesis model 1, converting the data of the joint prosthesis model 1 into data under a set coordinate system; alternatively, after the bone cutter model 2 is constructed, the data of the bone cutter model 2 is converted into data in a set coordinate system.
In this embodiment, the set coordinate system may be selected as the coordinate system of the robot performing the actual bone cutting operation or other coordinate systems for robot operation, i.e. the bone cutting plane data finally obtained by this coordinate conversion method may be directly applied to the actual operation of the robot.
Step S3 specifically includes:
step S31, based on the subtraction algorithm in Boolean operation, cutting bones of the bone model 3 by using the bone cutter model 2;
in this embodiment, the bone cutting of the bone model 3 based on boolean operation specifically includes:
compiling a simulation bone cutting program, wherein the simulation bone cutting program comprises bone model data reading, bone cutter model reading and a Boolean algorithm among models;
the data of the bone model 3 and the data of the osteotomy model 2 are read by the simulation osteotomy program, and the osteotomy operation is performed.
The simulation bone cutting operation is realized by adopting a mode of compiling a simulation bone cutting program, the method has wide applicability, can be suitable for the same or approximately the same simulation bone cutting program aiming at different types of joint prosthesis models 1, can effectively save the time for simulating bone cutting for many times, and improves the simulation bone cutting efficiency.
In other embodiments, the cutting the bone model 3 based on the boolean operation specifically includes: introducing the bone model 3 and the osteotomy model 2 into the same modeling interface; the osteotomer model 2 is used to resect a portion of the material of the bone model 3 based on a built-in algorithm in the modeling software. The operation mode is simple to operate, can avoid complicated programming operation, and has a good effect on single or few operations.
Step S32, the bone cutting effect of the bone model 3 is checked, and the model preparation module extracts the bone cutting surface data.
As shown in fig. 4, after the osteotomy simulation method provided in this embodiment is used to perform osteotomy, not only can the osteotomy plane 32 completely fitted to the bone fitting surface 12 of the joint prosthesis model 1 be formed on the bone model 3, but also the intercondylar recess 31 and the positioning hole 33 can be cut out, so that the osteotomy effect is good, and thus more accurate osteotomy plane data can be extracted, and more precise and accurate work is provided for the actual osteotomy operation in the later stage.
According to the bone cutting simulation method provided by the embodiment, the bone cutter model 2 is constructed in the joint prosthesis model 1, so that the joint prosthesis model 1 and the bone cutter model 2 can be ensured to be in the same coordinate system, the effect that the joint prosthesis and the bone cutting surface are completely overlapped after bone cutting operation can be achieved, the calculation amount of the space coordinate system conversion step between the joint prosthesis model 1 and the bone cutter model 2 is saved, and the bone cutting simulation efficiency is improved. Meanwhile, the bone model 3 is cut by adopting the bone cutter model 2 through Boolean operation, so that the bone cutting efficiency can be effectively improved, and more accurate bone cutting surface data can be obtained. Meanwhile, the bone cutting simulation method has universality on different types of joint prosthesis models 1, the number of the bone cutting surfaces is not limited, the bone cutting surfaces are not limited to be planes, and the universality is high.
Meanwhile, the construction method of the osteotome model 2 can quickly and conveniently form the intercondylar osteotomy boss 21 consistent with the intercondylar boss 11 and the drilling column 23 consistent with the positioning column 13 on the osteotome model 2, so that the effect of simulating osteotomy is further improved.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. A simulated bone cutting system, comprising:
the model preparation module is used for preparing a joint prosthesis model and a bone model of a bone to be simulated;
the modeling module is used for constructing a bone cutter model according to the joint prosthesis model;
a coordinate transformation module for making the coordinate system of the osteotomy model consistent with the coordinate system of the bone model;
the Boolean budget module is used for cutting bones of the bone model by adopting the bone cutter model based on a Boolean algorithm;
the modeling module is capable of modeling based on the joint prosthesis model as follows:
extracting an inner concave side contour line of a main body of the joint prosthesis model under a side view angle;
drawing an external expansion contour line positioned on the outer side of the concave side contour line, and connecting the external expansion contour line with the concave side contour line to form a closed sketch contour, wherein the sketch contour wraps the contour of the main body;
and performing stretching modeling based on the sketch outline to form a stretching model, wherein the stretching length of the stretching model is greater than that of the joint prosthesis model.
2. The simulated bone cutting system of claim 1, wherein constructing the bone cutter model further comprises:
extracting an outer convex side contour line of a main body of the joint prosthesis model under a side view;
expanding the convex side contour line in a direction away from the concave side contour line to form the flared contour line.
3. The simulated bone cutting system of claim 1, wherein the joint prosthesis model has an intercondylar boss, and constructing the bone cutter model further comprises: and constructing an intercondylar osteotomy boss which is consistent in shape and position with the intercondylar boss on the stretching model.
4. The simulated bone-cutting system of claim 1, wherein the concave side of the joint prosthesis model has a positioning post, and constructing the osteotomy model further comprises: and constructing a drilling column which is consistent with the positioning column in appearance and is superposed with the positioning column in position on the tensile model.
5. The simulated bone-cutting system according to any one of claims 1-4, wherein cutting the bone model based on the Boolean operation specifically comprises:
compiling a simulation bone cutting program, wherein the simulation bone cutting program comprises bone model data reading, bone cutter model reading and a Boolean operation algorithm among models;
reading the data of the bone model and the data of the osteotomy device model through the simulation osteotomy program, and performing osteotomy operation;
obtaining the bone model after bone cutting;
and extracting the bone cutting surface data.
6. The simulated bone-cutting system of any one of claims 1-4, wherein cutting the bone model based on the Boolean operation comprises:
importing the data of the bone model and the data of the osteotomy model into the same modeling interface;
using the osteotomy model to resect a portion of material of the bone model based on a built-in algorithm in modeling software;
and extracting the bone cutting surface data.
7. The simulated bone cutting system of any one of claims 1-4, wherein conforming the coordinate system of the bone cutter model to the coordinate system of the bone model specifically comprises: in preparing the joint prosthesis model, data of the joint prosthesis model is converted into data in the bone model coordinate system.
8. The simulated bone cutting system of any one of claims 1-4, wherein conforming the coordinate system of the bone cutter model to the coordinate system of the bone model specifically comprises: after the bone cutter model is built, converting the data of the bone cutter model into the data in the bone model coordinate system.
9. The simulated bone cutting system of any one of claims 1-4, wherein conforming the coordinate system of the bone cutter model to the coordinate system of the bone model specifically comprises:
converting the data of the bone model into model data under a set coordinate system;
when preparing the joint prosthesis model, converting data of the joint prosthesis model into data under the set coordinate system; or after the bone cutter model is constructed, converting the data of the bone cutter model into the data in the set coordinate system.
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| CN202210012243.1A Active CN114073606B (en) | 2022-01-07 | 2022-01-07 | Simulation bone cutting system |
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| CN113729847A (en) * | 2021-09-28 | 2021-12-03 | 上海交通大学医学院附属第九人民医院 | Femur osteotomy guide plate assembly and construction method of model thereof |
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| CN101288597A (en) * | 2008-06-20 | 2008-10-22 | 周一新 | Knee-joint prosthesis implantation process, osteotomy module thereof and device thereof |
| CN106232035A (en) * | 2014-04-11 | 2016-12-14 | 思想外科有限公司 | Rotatable arc drill bit and automatic cutting application in orthopedics |
| CN113317843A (en) * | 2021-05-08 | 2021-08-31 | 广东医科大学附属医院 | Preparation method of individualized knee joint unicondylar replacement tibia accurate osteotomy guide plate |
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