CN104622559B - A kind of construction method of parametrization femur template - Google Patents
A kind of construction method of parametrization femur template Download PDFInfo
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- CN104622559B CN104622559B CN201410811801.6A CN201410811801A CN104622559B CN 104622559 B CN104622559 B CN 104622559B CN 201410811801 A CN201410811801 A CN 201410811801A CN 104622559 B CN104622559 B CN 104622559B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
- A61B17/8061—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates specially adapted for particular bones
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
- A61B17/1662—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans for particular parts of the body
- A61B17/1664—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans for particular parts of the body for the hip
- A61B17/1668—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans for particular parts of the body for the hip for the upper femur
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00526—Methods of manufacturing
Abstract
The invention discloses a kind of construction method of parametrization femur template.First, based on each local spline contour line of femur, local surface model is created, design transition curved surface features are smoothly connected adjacent local surface；Then, design near end of thighbone and far-end parameter, according to parameter and the relatedness of local surface, realize the function of changing local surface form by adjusting single parameter；Finally, according to dependency between femur parameter, determine, design major parameter, details parameter create parametrization femur template.The present invention can pass through parameter and represent femoral curvatures form intuitively, exactly, can generate a series of diversified femur models based on the modification of parameter, significant to patient's blade plate personalized designs in bone surgery.
Description
Technical field
The present invention relates to a kind of digital femur modeling technique, and in particular to a kind of construction method of parametrization femur template,
The invention belongs to field of computer aided design.
Background technology
With developing rapidly for computer digit technology and medical imaging technology, CAOS becomes development
The most rapid field.The research of orthopaedics implant and prosthetic designs is carried out with application at home using related computer technology
In widespread attention outward.The pathological changes of femur are one of most common case in surgical operation, its structural complexity and form with fracture
Scrambling is maximum problem in digital femur Modeling Research.Common modeling method is：Obtain first by CT/MRI scannings
Sampling notebook data, imports data reconstruction based on a cloud or the data model of grid, secondly to a cloud or grid using several where
Method is optimized process, ultimately produces femur model, and such as reference paper (WO2011158117A2) discloses one kind and utilizes 3D
The system and method that imaging technique makes bone geometry.Its shortcoming mainly includes：Computationally intensive, lack the high-rise meaning of one's words, it is difficult to
Relation between femur each several part is represented, for femur defect position cannot accurate reconstruction.
Content of the invention
In order to solve the deficiencies in the prior art, the invention provides a kind of structure side of parametrization femur template
Method, automatically creates parametrization femur template based on medical features parameter, can pass through parameter and represent femoral curvatures intuitively, exactly
Form, can generate a series of diversified femur models based on the modification of parameter, personalized to patient's blade plate in bone surgery
Design is significant.
For solving the above problems, the present invention is specifically employed the following technical solutions：
A kind of construction method of parametrization femur template, it is characterised in that comprise the following steps：
Step 1：Based on each local spline contour line of femur, local surface model is created, design transition curved surface features are smooth
Connect adjacent local surface model, build femur overall situation surface model, surface accuracy is guaranteed by error analyses；
Step 2：Design femur parameter, according to parameter and the relatedness of local surface model, realizes that adjustment single parameter is repaiied
Change the function of local surface form；
Step 3：According to dependency between femur parameter, determine, design agentses parameter, details ginseng
Number, creates parametrization femur template.
The construction method of aforesaid a kind of parametrization femur template, it is characterised in that the step 1 is comprised the following steps：
Step 1a, cutting femur equalization grid model, generates femur local spline contour line, using hemisphere mode or
The mode that eyelid covering, filling, eyelid covering are combined with filling creates local surface model；
Step 1b, design transition curved surface features are smoothly connected adjacent local surface model in step 1a, form femur
Global surface model；
Step 1c, carries out error analyses to global surface model in local surface model in step 1a and step 1b, passes through
Contour line in set-up procedure 1a, improves the precision of local surface model and global surface model.
The construction method of aforesaid a kind of parametrization femur template, it is characterised in that the step 2 is comprised the following steps：
Step 2a, designs femur parameter, and the parameter includes near-end parameter and far-end parameter；
Step 2b, according to the pass of local surface model in the near-end parameter, far-end parameter and step 1a designed in step 2a
Connection property, adjustment near-end or far-end parameter modification local surface form.
The construction method of aforesaid a kind of parametrization femur template, it is characterised in that the step 3 is comprised the following steps：
Step 3a, according to the dependency in step 2a between femur parameter, determines in step 1a and associates between local surface, design
Main body parameter, creates parametrization femur template；
Step 3b, increases details parameter further to improve the curved surface details quality of parametrization femur template, optimization step
Parametrization femur template in 3a.
The construction method of aforesaid a kind of parametrization femur template, it is characterised in that the step of the step 1 in 1a, institute
Stating local surface model includes femoral head, cervical region, greater trochanter part, femur stem portion, distal end condyles, and femoral head is based on partly
Ball mode is created, and cervical region, greater trochanter part, femur stem portion, distal end condyles are using eyelid covering, filling or side that the two combines
Formula is created.
The construction method of aforesaid a kind of parametrization femur template, it is characterised in that the step of the step 1 in 1b, institute
Global surface model is stated by the expression whole femur form that is made up of all local surface models in step 1a and fillet surface
Surface composition.
The construction method of aforesaid a kind of parametrization femur template, it is characterised in that the step of the step 2 in 2a, institute
Stating near-end parameter includes a radius size (C1, i.e. head are fitted the radius of a ball), collodiaphyseal angle angle (C2, i.e. neck axis and femur
The angle of dry upper end axis), neck length (C3, i.e. the femoral head centre of sphere to neck axis and femoral shaft upper end focus axis away from
From), neck radius size (C4, the i.e. radius of cervical region isthmus section fitting circle), (C5, i.e. the femoral head centre of sphere is to stock for eccentric throw length
The vertical dimension of key upper end axis), T-20 transverse diameter length (C6, lesser trochanter point and femoral shaft upper end axis place plane with little
Under rotor, 20mm goes out distance between two intersection points of section line), (C7, i.e. the femoral head centre of sphere are to lesser trochanter place section for femur grease head highness
Vertical dimension).The far-end parameter includes：Femur length (A1, i.e. greater trochanter peak to condyles minimum point vertical away from
From), shaft length (B1, i.e. condyles most inner side and outermost distance between two points), ectocondyle height (are pushed up on the outside of B2, i.e. preartis line on condyle
The vertical dimension of the plane constituted to postartis line and femoral shaft axis direction by point), interior condyle highly (B3, i.e. preartis line medial roof
The vertical dimension of the plane constituted to postartis line and femoral shaft axis direction by point), preartis line length is (on the outside of in B4, i.e. preartis
Two highest dot spacings from), postartis line length (B5, i.e. postartis in outside two highest dot spacings from), ectocondyle tilt angles (B6, i.e.,
The angle of line and postartis line between preartis points outside and postartis points outside), interior condyle tilt angles (put on the inside of B7, i.e. preartis with rear
The angle of line and postartis line between putting on the inside of condyle), coaster ditch height (B8, i.e. coaster ditch summit to postartis line and femoral shaft axis
The vertical dimension of the plane constituted by direction), coaster ditch angle angle (B9, i.e. preartis points outside, coaster ditch point, point on the inside of preartis
Angle between 3 points), transverse diameter length (B10, i.e. projector distance of the condyle upper shaft on postartis line).
The construction method of aforesaid a kind of parametrization femur template, it is characterised in that the step of the step 2 in 2b, can
Include that shaft length (B1) on femur length (A1), condyle, ectocondyle height (B2), head radius are big to change the parameter of local surface form
Little (C1), neck length (C3), neck radius size (C4), eccentric throw length (C5).
The construction method of aforesaid a kind of parametrization femur template, it is characterised in that the step of the step 3 in 3a, institute
Dependency between femur parameter is stated by relatively average model construction, the main body parameter is femur length (A1), femur length
(A1) rate of change etc. is than shaft length (B1) on condyle, ectocondyle height (B2), head radius size (C1), neck length (C3), neck
Radius size (C4), eccentric throw length (C5), are associated as between the local surface when parameter adjustment, the office corresponding with parameter
Correlation surface in portion's curved surface deforms simultaneously.
The construction method of aforesaid a kind of parametrization femur template, it is characterised in that the step of the step 3 in 3b, institute
Stating details parameter includes coaster ditch height (B8), collodiaphyseal angle angle (C2), T-20 transverse diameter length (C6).
Beneficial effects of the present invention：A kind of construction method of parametrization femur template that the present invention is provided, based on parametrization
Template automatically creates femoral curvatures model, and running efficiency of system is high, while supporting the personalized designs of femoral curvatures.The present invention should
Field is manufactured for Medical orthopaedic operation and medical devices, parameter can be passed through and represented femoral curvatures form intuitively, exactly, be referred to
Personalized plate design of the guide pin to patient femur's feature, significant to sham operated and raising surgical effect.
Description of the drawings
Fig. 1 is a kind of construction method flow chart of parametrization femur template in the present invention；
Fig. 2 is that femoral curvatures create process schematic in the present invention；
Fig. 3 is Proximal femoral parametersization identification schematic diagram in the present invention；
Fig. 4 is distal femur parametrization identification schematic diagram in the present invention；
Fig. 5 is impact contrast schematic diagram of the local parameter to femoral curvatures in the present invention；
Fig. 6 is to increase femoral curvatures model contrast schematic diagram before and after details parameter in the present invention.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of construction method of parametrization femur template, may be summarized to be
Suddenly：
Step 1：Based on each local spline contour line of femur, local surface model is created, design transition curved surface features are smooth
Connect adjacent local surface model, build femur overall situation surface model, surface accuracy is guaranteed by error analyses；
Step 2：Design femur parameter, according to parameter and the relatedness of local surface model, adjusts the list in femur parameter
One parameter modification local surface form；
Step 3：According to dependency between femur parameter, determine, design agentses parameter, details ginseng
Number, creates parametrization femur template.
Specifically, first, based on each local spline contour line of femur, local surface model is created, design transition curved surface is special
Levy, be smoothly connected adjacent local surface model, build femur overall situation surface model, surface accuracy is guaranteed by error analyses, wrapped
Include following steps：
Step 1a, cutting femur equalization grid model, generates femur local spline contour line, using hemisphere mode or
The mode that eyelid covering, filling, eyelid covering are combined with filling creates local surface model；
Step 1b, design transition curved surface features are smoothly connected adjacent local surface model in step 1a, form femur
Global surface model；
Step 1c, carries out error analyses to global surface model in local surface model in step 1a and step 1b, passes through
Contour line in set-up procedure 1a, improves the precision of local surface model and global surface model.
Then, Parametric designing is carried out to femur, determines the relatedness of each parameter and local surface model, realized by single
The change adjustment local surface form of one parameter, comprises the following steps：
Step 2a, designs femur parameter, carries out Parametric designing, the parameter bag near end of thighbone and curved distal feature
Include near-end parameter and far-end parameter, near-end parameter include a radius size (C1), collodiaphyseal angle angle (C2), neck length (C3),
Neck radius size (C4), eccentric throw length (C5), T-20 transverse diameter length (C6), femur grease head highness (C7), the far-end parameter bag
Include shaft length (B1) on femur length (A1), condyle, ectocondyle height (B2), interior condyle height (B3), preartis line length (B4), postartis line
Length (B5), ectocondyle tilt angles (B6), interior condyle tilt angles (B7), coaster ditch height (B8), coaster ditch angle angle (B9), horizontal stroke
Electrical path length (B10)；
Step 2b, according to the pass of local surface model in the near-end parameter, far-end parameter and step 1a designed in step 2a
Connection property, realizes the following arbitrary parameter of modification to adjust the function of local surface：Shaft length (B1) on femur length (A1), condyle, outer
Condyle height (B2), head radius size (C1), neck length (C3), neck radius size (C4), eccentric throw length (C5).
Finally, according to dependency between femur parameter, determine, design agentses parameter, details parameter,
Parametrization femur template is created, is comprised the following steps：
Step 3a, according to the dependency in step 2a between femur parameter, determines in step 1a and associates between local surface, design
Main body parameter, creates parametrization femur template；
Step 3b, increases details parameter further to improve the curved surface details quality of parametrization femur template, optimization step
Parametrization femur template in 3a, details parameter include coaster ditch height (B8), collodiaphyseal angle angle (C2), T-20 transverse diameter length
(C6).
As shown in Fig. 2 (a) described establishment femoral curvatures model under CATIA platforms by femur equalize grid mould
Type carries out cutting Formation cross-section line；Closure SPL is constituted based on section line up-sampling control point, contour line (b) is formed；Base
The femoral head centre of sphere and radius being determined in fitting, creating hemisphere representation of a surface femoral head, other positions use eyelid covering mode generation office
Portion's curved surface, boundary profile form closed surface using filling mode, such as shown in (c)；Using tangent continuous between local surface
Mode creates fillet surface, is smoothly connected each local surface, forms femur overall situation curved surface (d).
As Fig. 3 carries out parametrization near end of thighbone, 7 parameters of near-end define specific as follows：Head radius size (C1) is stock
Bone portion is fitted the radius of a ball, and collodiaphyseal angle angle (C2) is neck axis and the angle of femoral shaft upper end axis, neck length (C3)
For the femoral head centre of sphere to neck axis and the distance of femoral shaft upper end focus axis, neck radius size (C4) is cervical region isthmus section
The radius of fitting circle, vertical dimension of the eccentric throw length (C5) for the femoral head centre of sphere to femoral shaft upper end axis, T-20 transverse diameters are long
Degree (C6) is that 20mm goes out distance between two intersection points of section line under lesser trochanter point and femoral shaft upper end axis place plane and lesser trochanter,
Femur grease head highness (C7) is vertical dimension of the femoral head centre of sphere to lesser trochanter place section.
As Fig. 4 carries out parametrization to distal femur, the parameter of distal end 11 defines specific as follows：Femur length (A1) turns for big
The vertical dimension of sub- peak to condyles minimum point, on condyle, shaft length (B1) is condyles most inner side and outermost distance between two points,
The vertical dimension of the plane that ectocondyle height (B2) is made up of preartis line outer point to postartis line and femoral shaft axis direction, interior
The vertical dimension of the plane that condyle height (B3) is made up of summit on the inside of preartis line to postartis line and femoral shaft axis direction, preartis
Line length (B4) is that two highest dot spacings of outside are two highest dot spacings of outside in postartis from, postartis line length (B5) in preartis
From ectocondyle tilt angles (B6) are line between preartis points outside and postartis points outside and the angle of postartis line, interior condyle tilt angles
(B7) it is the angle of line and postartis line between point on the inside of point on the inside of preartis and postartis, coaster ditch height (B8) is arrived for coaster ditch summit
The vertical dimension of the plane constituted with femoral shaft axis direction by postartis line, coaster ditch angle angle (B9) are preartis points outside, cunning
Angle between three points is put on the inside of rut point, preartis, and transverse diameter length (B10) is projector distance of the condyle upper shaft on postartis line.
As shown in figure 5, being based on VC++ platforms, for the definition of each parameter, each ginseng is obtained under equalization femur model
Numerical value, i.e. averaging parameter, build surface model, such as shown in figure (a)；Realize modification single parameter to change the work(of local surface
Can, (b1), (b2) be respectively reduce, increase femur length (A1), (c1), (c2) be respectively reduce, increase head radius size
(C1), (d1), (d2) be respectively reduce, increase neck length (C3), (e1), (e2) be respectively increase, reduce eccentric throw length
(C5), (f1), (f2) be respectively reduce, increase condyle on shaft length (B1), (g1), (g2) be respectively reduce, increase ectocondyle height
(B2).
As shown in fig. 6, (a), (c) generate femur model by being input into main body parameter；Increase details parameter, by reducing neck
After dry angle angle (C2), increase T-20 transverse diameter length (C6), increase coaster ditch height (B8) operation, generating femur Optimized model is
Shown in (b), (d).
What the present invention was not further illustrated is prior art.
The present invention gives a kind of construction method of parametrization femur template.First, based on each local spline profile of femur
Line, creates local surface model, and design transition curved surface features are smoothly connected adjacent local surface；Then, design near end of thighbone and
Far-end parameter, according to parameter and the relatedness of local surface, realizes the work(for changing local surface form by adjusting single parameter
Energy；Finally, according to dependency between femur parameter, determine, design major parameter, details parameter are created
Parametrization femur template.The present invention can pass through parameter and represent femoral curvatures form intuitively, exactly, being capable of repairing based on parameter
Change a series of diversified femur models of generation, significant to patient's blade plate personalized designs in bone surgery.
Ultimate principle, principal character and the advantage of the present invention has been shown and described above.The technical staff of the industry should
Understand, the present invention is not restricted to the described embodiments, the original that the present invention is simply described described in above-described embodiment and description
Reason, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, these changes and improvements
Both fall within scope of the claimed invention.The claimed scope of the invention is by appending claims and its equivalent circle.
Fixed.
Claims (10)
1. a kind of construction method of parametrization femur template, it is characterised in that comprise the following steps：
Step 1：Based on each local spline contour line of femur, local surface model is created, design transition curved surface features are smoothly connected
Adjacent local surface model, builds femur overall situation surface model, guarantees surface accuracy by error analyses；
Step 2：Design femur parameter, according to parameter and the relatedness of local surface model, adjusts femur parameter modification local bent
Face form；
Step 3：According to dependency between femur parameter, determine, design agentses parameter, details parameter, wound
Build parametrization femur template.
2. the construction method of a kind of parametrization femur template according to claim 1, it is characterised in that the step 1 is wrapped
Include following steps：
Step 1a, cutting femur equalization grid model, generates femur local spline contour line, using hemisphere mode or illiteracy
The mode that skin, filling, eyelid covering are combined with filling creates local surface model；
Step 1b, design transition curved surface features are smoothly connected adjacent local surface model in step 1a, form the overall situation of femur
Surface model；
Step 1c, carries out error analyses to global surface model in local surface model in step 1a and step 1b, by adjustment
Contour line in step 1a, improves the precision of local surface model and global surface model.
3. the construction method of a kind of parametrization femur template according to claim 1, it is characterised in that the step 2 is wrapped
Include following steps：
Step 2a, designs femur parameter, and the parameter includes near-end parameter and far-end parameter；
Step 2b, according to the relatedness of local surface model in the near-end parameter, far-end parameter and step 1 designed in step 2a,
Adjustment near-end or far-end parameter modification local surface form.
4. the construction method of a kind of parametrization femur template according to claim 1, it is characterised in that the step 3 is wrapped
Include following steps：
Step 3a, according to the dependency in step 2 between femur parameter, determines in step 1 and associates, design agentses are joined between local surface
Number, creates parametrization femur template；
Step 3b, increases details parameter further to improve the curved surface details quality of parametrization femur template, in optimization step 3a
Parametrization femur template.
5. the construction method of a kind of parametrization femur template according to claim 2, it is characterised in that the step 1
In step 1a, the local surface model includes femoral head, cervical region, greater trochanter, femoral shaft, distal end condyles, femoral head base
Create in hemisphere mode, cervical region, greater trochanter, femoral shaft, distal end condyles are created using eyelid covering, filling or the two mode for combining
Build.
6. the construction method of a kind of parametrization femur template according to claim 5, it is characterised in that the step 1
In step 1b, the global surface model is by complete with the expression that fillet surface is constituted by all local surface models in step 1a
The surface composition of whole femur form.
7. the construction method of a kind of parametrization femur template according to claim 3, it is characterised in that the step 2
In step 2a, the near-end parameter includes that a radius size (C1), collodiaphyseal angle angle (C2), neck length (C3), neck radius are big
Little (C4), eccentric throw length (C5), T-20 transverse diameter length (C6), femur grease head highness (C7), the far-end parameter include that femur is long
Shaft length (B1), ectocondyle height (B2), interior condyle height (B3), preartis line length (B4), postartis line length on degree (A1), condyle
(B5), ectocondyle tilt angles (B6), interior condyle tilt angles (B7), coaster ditch height (B8), coaster ditch angle angle (B9), transverse diameter are long
Degree (B10).
8. the construction method of a kind of parametrization femur template according to claim 7, it is characterised in that the step 2
In step 2b, the parameter for changing local surface form includes shaft length (B1) on femur length (A1), condyle, ectocondyle height (B2).
9. the construction method of a kind of parametrization femur template according to claim 4, it is characterised in that the step 3
In step 3a, by relatively average model construction, the main body parameter is femur length to the dependency between the femur parameter
(A1), rate of change of femur length (A1) etc. is than shaft length (B1) on condyle, ectocondyle height (B2), head radius size (C1), neck
Minister's degree (C3), neck radius size (C4), eccentric throw length (C5), are associated as between the local surface when parameter adjustment, with
Correlation surface in the corresponding local surface of parameter deforms simultaneously.
10. the construction method of a kind of parametrization femur template according to claim 9, it is characterised in that the step 3
In step 3b, the details parameter includes coaster ditch height (B8), collodiaphyseal angle angle (C2), T-20 transverse diameter length (C6).
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| CN104933263B (en) * | 2015-07-03 | 2018-02-16 | 河海大学常州校区 | A kind of bone plate Design Methods for Series based on average femur model |
| CN105427367B (en) * | 2015-11-16 | 2018-08-07 | 河海大学常州校区 | The design method of shin bone T-type bone plate based on parametric technology |
| CN105653887A (en) * | 2016-03-24 | 2016-06-08 | 河海大学常州校区 | Method for recovering damaged skeleton model based on parametric template |
| CN107149494A (en) * | 2017-04-06 | 2017-09-12 | 国家康复辅具研究中心 | The controllable personalized hone lamella Fast design method of laminating degree |
| CN106963489B (en) * | 2017-05-12 | 2019-05-10 | 常州工程职业技术学院 | A kind of individuation femoral fracture reset model construction method |
| CN110570464B (en) * | 2019-09-16 | 2022-03-18 | 常州工程职业技术学院 | Femur model registration method oriented to skeleton shape averaging |
| CN112451090B (en) * | 2019-11-06 | 2022-02-18 | 中国人民解放军总医院第四医学中心 | Construction system of analysis model |
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