CN109299583A - A kind of production method of the medical internal fixation plate of titanium alloy - Google Patents

A kind of production method of the medical internal fixation plate of titanium alloy Download PDF

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CN109299583A
CN109299583A CN201811471027.3A CN201811471027A CN109299583A CN 109299583 A CN109299583 A CN 109299583A CN 201811471027 A CN201811471027 A CN 201811471027A CN 109299583 A CN109299583 A CN 109299583A
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bending
titanium alloy
coordinate
section
contrast piece
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CN109299583B (en
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张佳楫
左国坤
梁烨
许仁杰
蒋灿华
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Ningbo Institute of Material Technology and Engineering of CAS
Xiangya Hospital of Central South University
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Ningbo Institute of Material Technology and Engineering of CAS
Xiangya Hospital of Central South University
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/11—Complex mathematical operations for solving equations, e.g. nonlinear equations, general mathematical optimization problems
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/16—Matrix or vector computation, e.g. matrix-matrix or matrix-vector multiplication, matrix factorization

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Abstract

The invention discloses a kind of production methods of the medical internal fixation plate of titanium alloy, include the following steps: production one contrast piece with unbent standard titanium alloy item with identical geometric profile size, contrast piece is subjected to physics bending along the mandibular 3D model that target patient has printed, the mandibular of contrast piece and target patient after guaranteeing bending fits closely；Contrast piece will have been bent and carried out CT scan, obtained the three-dimensional shape information file of contrast piece after bending spatially；Analysis and solution is carried out to three-dimensional shape information file, obtains contrast piece profile information after bending；Above-mentioned profile information is converted to the bending process parameter of titanium alloy item, and is imported in the control software of bending mechanism control system, is acted using bending mechanism, can make to obtain the medical internal fixation plate of titanium alloy.The present invention can carry out disposable bending process to titanium alloy item, realize the standardization of bending process and improve machining accuracy.

Description

A kind of production method of the medical internal fixation plate of titanium alloy
Technical field
The invention belongs to the field of medical instrument technology more particularly to a kind of production methods of the medical internal fixation plate of titanium alloy.
Background technique
Due to traffic accident, tumble injury, the wounds factor such as collide with, the fracture, fragmentation or excalation of human body jawbone will cause.Jawbone Lesion (innocent and malignant tumour etc.) will cause mandibular shapes destruction or function is lost, and medical worker has in the course of disease treatment The jawbone of lesion is cut or cut off, this has resulted in the successional destruction of jawbone.The imperfect of jawbone not only influences to suffer from The beauty of person's face, and the functions such as the chewing of patient, speech are directly affected, affect the physical and mental health of patient.
For the defect or missing of jawbone, need to connect each bone section using titanium alloy internal fixation device in medical procedure It connects, and some patientss need to fill up patient's jawbone deleted areas using the part fibula of leg in the operation in more forward position, Repair process is unfolded around how preferably to restore patient's Maxillary region form, and an important maintenance device of final form is exactly The titanium alloy internal fixation device that personalization is bent.The material of titanium alloy internal fixation device is mainly titanium alloy, and titanium alloy is not only close It spends that small, intensity is high, and there are the series of advantages such as good corrosion resistance, heat resistance be high and nontoxic.In jawbone moulding, fixation side Face, usually used titanium alloy are TC4, constituent Ti6Al4V belongs to (alpha+beta) Type Titanium Alloy, with good comprehensive Resultant force learns mechanical performance.
In the prior art the medical internal fixation plate of titanium alloy generally using by hand beats production, have the following disadvantages: 1) in order to By standard titanium alloy sheet manual bending at intended shape, need manually mode bent, preoperative high-precision bends average consumption When that precision is quickly bent close to 2 hours, in art is extremely low；2) due to titanium alloy fixed plate fatigue strength, work as number of bends Phenomena such as titanium alloy fixed plate also occurs that fracture when more, the service life is insufficient；3) shape that titanium alloy fixed plate is bowed out is complete Depending on the experience of doctor, the curve precision bent out not can guarantee, and the titanium alloy fixed plate of low precision not only affects trouble Beauty and level of comfort when person uses, more affect the degree of reliability of patient's lower jaw bone fixation, or even directly decide mouth The fixed success or failure of chamber moulding；4) it after the mandibular 3d model of patient prints at present, goes to extract without more succinct method The foundation that its feature is bent as titanium plate, therefore the bending of titanium plate shape can not be standardized operation, need by operator Experience.
Summary of the invention
Technical problems to be solved in this application are to provide a kind of production method of medical internal fixation plate of titanium alloy, utilize The medical internal fixation plate of titanium alloy of this method production has the advantages that with high accuracy.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
A kind of production method of the medical internal fixation plate of titanium alloy, includes the following steps:
Step 1: production one has the contrast piece of identical geometric profile size with unbent standard titanium alloy item, right Have the characteristics that than part it is easily deformable, and by several disc sections being sequentially arranged and the linkage section for connecting adjacent two discs section Composition；
Step 2: contrast piece is subjected to physics bending along the mandibular 3D model that target patient has printed, is folded over Cheng Zhong guarantees that disc section does not deform, and the mandibular of contrast piece and target patient after guaranteeing bending fits closely；
Step 3: contrast piece will have been bent and carried out CT scan, obtained the 3D shape of contrast piece after bending spatially Message file；
Step 4: analysis and solution is carried out to three-dimensional shape information file, obtains the centre coordinate C of each disc sectioni= [cxi,cyi,czi] and reference axis normal vectorObtain contrast piece profile information after bending
Step 5: above-mentioned profile information is converted to the bending process parameter of titanium alloy item, and imports bending mechanism control In the control software of system, corresponding actions are done using the collet of the bending process driving parameter bending mechanism and carry out actual flexion, It can make to obtain the medical internal fixation plate of titanium alloy.
Further, in bending machining, dedicated bending mechanism includes two collets, respectively clamp head and dynamic collet, When not carrying out bending operation, clamp head is fixed at the center hole location of i-th of disc section of titanium alloy item, and dynamic collet is fixed on At the center hole location of (i-1)-th disc section of titanium alloy item, when starting bending, clamp head end is fixed, and dynamic chuck end It is driven by a motor and is rotated around clamp head end to carry out bending deformation to titanium alloy, the angle specifically rotated is by following methods It determines:
The central coordinate of circle for enabling i-th face of aluminum alloy bar section is respectively with coordinate axial vector
The central coordinate of circle of (i-1)-th disc section of aluminum alloy bar is respectively with coordinate axial vector
It takesFor the origin and X, Y, Z axis of new relative coordinate system, (i-1)-th each disc is recalculated The central coordinate of circle of section is denoted as with relative coordinate position of the coordinate axial vector under new coordinate system with phasor coordinate:Each freedom degree for then controllably braking collet, which corresponds to motor, will rotate angle in rotoflector It moves to clip position and to be newly calculatedThus position can get accurate bending and add Work precision.
Further, the specific solution procedure of contrast piece profile information after bending is as follows:
Step 1: any 3 points in specified i-th of disc section, calculate 3 points of plane equations determined；
Step 2: calculate three-dimensional shape information file in all the points with respect to the plane distance, using distance as judgment basis, This o'clock is then determined in i-th of disc section when the distance of certain point is less than preset threshold, obtains new spatial point set { P1 }i, Belong to the point of the set, constitutes i-th of disc section；
Step 3: specified point set { P1 }iIn be located at edge any two points PA、PBAnd the friendship of disc section and linkage section Point PC, obtain above 3 points of the spatial value；
Step 4: in conjunction with PA、PB、PCCoordinate value and the point where plane equation and disc section diameter D0, adjacent The width k of the linkage section of two disc sections0, solve i-th of disc section central coordinate of circle Ci=[cxi,cyi,czi] and reference axis method Vector
Step 5: by the above process, successively solving the central coordinate of circle and its coordinate axial vector of each disc section.
Further, contrast piece uses aluminum alloy bar.
Compared with prior art, the present invention has the advantage that
1, the present invention carries out bending by the control sample of mutability, and is scanned to the contrast piece after bending, to obtaining The data obtained, which calculate solving, obtains contrast piece profile information after bending, converts profile information to the bending of titanium alloy item Bending process parameter is imported into the control software of dedicated bending mechanism by technological parameter by writing program, curved using this The collet of bent technological parameter driving bending mechanism does corresponding actions and carries out actual flexion, can make to obtain titanium alloy medical interior solid Fixed board, this method can carry out disposable bending process to titanium alloy item, realize the standardization of bending process and improve processing essence Degree.
2, it is bonded in advance using mandibular of the aluminum strip to target patient, compared to using titanium alloy item directly to be bent, Can the person of being more convenient to operate use, improve fitting efficiency.
Detailed description of the invention
Fig. 1 is not to be bent titanium alloy original shape in the present invention；
Fig. 2 is not to be bent aluminium gold original shape in the present invention；
Fig. 3 is digitlization shape of the aluminum alloy bar after bending after CT scan in the present invention；
Fig. 4 is the schematic diagram of i-th of bending side in the present invention；
Fig. 5 is that digitlization solves each bending side characteristic information process figure in the present invention；
Fig. 6 is that fixed plate is preced in processing in titanium alloy Asia in the present invention, the schematic diagram of clamp head and dynamic collet；
Wherein: 1, #1 bending side；2, #2 bending side；3, #3 bending side；4, #4 bending side；5, #5 bending side；6, #6 is bent Face；7, #7 bending side；8, #8 bending side；9, #9 bending side；10, #10 bending side；11, #11 bending side；12, #12 bending side； 13, #13 bending side；14, #14 bending side；15, #15 bending side；16, #16 bending side；17, #17 bending side；18, #18 is bent Face；19, #19 bending side；20, #20 bending side；21, #21 bending side；22, #22 bending side.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1 not bend titanium alloy strip, which is unified standard part, is sequentially arranged by several The disc section (bending side) of column and for connecting adjacent two discs section linkage section composition, disc section be equipped with center positioning hole. In the present embodiment, titanium alloy item has 22 disc sections, and disc end shape invariance in titanium alloy bending process, only linkage section is sent out Raw deformation, but disc end spaces relative position will change, contrast piece uses aluminum alloy bar in the present embodiment, certainly The metal strip of other mutabilities can be used.
A kind of-Fig. 6 referring to fig. 2, production method of the medical internal fixation plate of titanium alloy, includes the following steps:
Step 1: production one has the aluminum alloy bar of identical geometric profile size with unbent standard titanium alloy item, Aluminum alloy bar is equally made of several disc sections being sequentially arranged and the linkage section for connecting adjacent two discs section；
Step 2: aluminum alloy bar is subjected to physics bending, bending along the mandibular 3D model that target patient has printed In the process, guarantee that disc section does not deform, the mandibular of contrast piece and target patient after guaranteeing bending fits closely；
Step 3: the aluminum alloy bar bent is subjected to CT scan, obtains three of aluminum alloy bar after bending spatially Tie up shape information file；
Step 4: analysis and solution is carried out to three-dimensional shape information file, obtains the centre coordinate C of each disc sectioni= [cxi,cyi,czi] and reference axis normal vectorObtain aluminum alloy bar profile information after bending
The specific solution procedure of aluminum alloy bar profile information after bending is as follows:
Step 1: any 3 points in specified i-th of disc section, calculate 3 points of plane equations determined；
Step 2: calculate three-dimensional shape information file in all the points with respect to the plane distance, using distance as judgment basis, When the distance of certain point is less than preset threshold (such as 10-3Then determine that this o'clock in i-th of disc section, obtains new space point set when mm) It closes { P1 }i, belong to the point of the set, constitute i-th of disc section；
Step 3: specified point set { P1 }iIn be located at edge any two points PA、PBAnd the friendship of disc section and linkage section Point PC, obtain above 3 points of the spatial value；
Step 4: in conjunction with PA、PB、PCCoordinate value and the point where plane equation and disc section diameter D0, adjacent The width k of the linkage section of two disc sections0, solve i-th of disc section central coordinate of circle Ci=[cxi,cyi,czi] and reference axis method Vector
Step 5: by the above process, successively solving the central coordinate of circle and its coordinate axial vector of each disc section.
Step 5: above-mentioned profile information is converted to the bending process parameter of titanium alloy item, and imports bending mechanism control In the control software of system, corresponding actions are done using the collet of the bending process driving parameter bending mechanism and carry out actual flexion, It can make to obtain the medical internal fixation plate of titanium alloy, the composition of specific structure and programming and control circuit as bending mechanism It is the prior art, details are not described herein.As shown in fig. 6, dedicated bending mechanism includes two collets in bending machining, point Not Wei clamp head and dynamic collet, when not carrying out bending operation, clamp head is fixed on the center of i-th of disc section of titanium alloy item At hole location, dynamic collet is fixed at the center hole location of (i-1)-th disc section of titanium alloy item, when starting bending, clamp head end It is fixed, and dynamic chuck end is driven by a motor and is rotated around clamp head end to carry out bending deformation to titanium alloy, it is specific The angle of rotation is determined by following methods:
The central coordinate of circle for enabling i-th of disc section of aluminum alloy bar (#i bending side) is respectively with coordinate axial vector
The central coordinate of circle of (i-1)-th disc section of aluminum alloy bar (#i-1 bending side) is respectively with coordinate axial vector
It takesFor the origin and X, Y, Z axis of new relative coordinate system, (i-1)-th each disc is recalculated The central coordinate of circle of section is denoted as with relative coordinate position of the coordinate axial vector under new coordinate system with phasor coordinate:Each freedom degree for then controllably braking collet, which corresponds to motor, will rotate angle in rotoflector It moves to clip position and to be newly calculatedThus position can get accurate bending and add Work precision.
Wherein, CiFor central coordinate of circle,To be fixed on C on the center of circleiVector, it is orthogonal.With vectorIn unified plane and parallel, vectorPerpendicular to the plane where bending circle；D0To bend circular diameter, k0It is curved for adjacent two Roll over the interconnecting piece width of circle；Point PCFor the interconnecting piece of adjacent two bending side and the top half crosspoint of this bending side, point PA, point PBFor any two points at the edge of the circle on bending side.
The information of extraction is changed into titanium and is closed by the present invention by the shape contour information extraction after bending to aluminum alloy bar The bending process parameter of gold bar, so as to use the mode of automatic programming that bending process parameter is input to dedicated bar folder On structure, disposable bending process is carried out to titanium alloy item, the standardization of bending process is realized and improves machining accuracy, use aluminum strip The mandibular of target patient is bonded in advance, compared to using titanium alloy item directly to be bent, can the person of being more convenient to operate use, Improve fitting efficiency.
Above-described embodiment is only to clearly demonstrate examples made by the present invention, rather than the restriction to embodiment.For For those of ordinary skill in the art, other various forms of variations or change can also be made on the basis of the above description It is dynamic.Here without can not be also exhaustive to all embodiments.And the obvious variation or change thus amplified out It is dynamic to be still in the protection scope of this invention.

Claims (4)

1. a kind of production method of the medical internal fixation plate of titanium alloy, which comprises the steps of:
Step 1: production one has the contrast piece of identical geometric profile size, contrast piece with unbent standard titanium alloy item Have the characteristics that it is easily deformable, and by several disc sections being sequentially arranged and the linkage section group for connecting adjacent two discs section At；
Step 2: the mandibular 3D model that contrast piece has been printed along target patient carries out physics bending, in bending process, Guarantee that disc section does not deform, the mandibular of contrast piece and target patient after guaranteeing bending fits closely；
Step 3: contrast piece will have been bent and carried out CT scan, obtained the three-dimensional shape information of contrast piece after bending spatially File；
Step 4: analysis and solution is carried out to three-dimensional shape information file, obtains the centre coordinate C of each disc sectioni=[cxi,cyi, czi] and reference axis normal vectorObtain contrast piece profile information after bending
Step 5: above-mentioned profile information is converted to the bending process parameter of titanium alloy item, and imports bending mechanism control system Control software in, using the collet of the bending process driving parameter bending mechanism do corresponding actions carry out actual flexion Production obtains the medical internal fixation plate of titanium alloy.
2. manufacturing method according to claim 1, which is characterized in that in bending machining, dedicated bending mechanism includes two A collet, respectively clamp head and dynamic collet, when not carrying out bending operation, clamp head is fixed on i-th of circle of titanium alloy item At the center hole location of face section, dynamic collet is fixed at the center hole location of (i-1)-th disc section of titanium alloy item, when starting to be bent When, clamp head end is fixed, and dynamic chuck end is driven by a motor and is rotated around clamp head end to be bent to titanium alloy Deformation, the angle specifically rotated are determined by following methods:
The central coordinate of circle for enabling i-th face of aluminum alloy bar section is respectively with coordinate axial vector
The central coordinate of circle of (i-1)-th disc section of aluminum alloy bar is respectively with coordinate axial vector
It takesFor the origin and X, Y, Z axis of new relative coordinate system, the circle of (i-1)-th each disc section is recalculated Heart coordinate is denoted as with relative coordinate position of the coordinate axial vector under new coordinate system with phasor coordinate:Each freedom degree for then controllably braking collet, which corresponds to motor, will rotate angle in rotoflector It moves to clip position and to be newly calculatedThus position can get accurate bending and add Work precision.
3. production method according to claim 2, which is characterized in that the specific solution of contrast piece profile information after bending Process is as follows:
Step 1: any 3 points in specified i-th of disc section, calculate 3 points of plane equations determined；
Step 2: calculate three-dimensional shape information file in all the points with respect to the plane distance, using distance as judgment basis, when certain The distance of point then determines this o'clock in i-th of disc section when being less than preset threshold, obtains new spatial point set { P1 } i, belongs to The point of the set constitutes i-th of disc section；
Step 3: specified point set { P1 }iIn be located at edge any two points PA、PBAnd the intersection point P of disc section and linkage sectionC, Obtain above 3 points of the spatial value；
Step 4: in conjunction with PA、PB、PCCoordinate value and the point where plane equation and disc section diameter D0, adjacent two circle The width k of the linkage section of face section0, solve i-th of disc section central coordinate of circle Ci=[cxi,cyi,czi] and reference axis normal vector
Step 5: by the above process, successively solving the central coordinate of circle and its coordinate axial vector of each disc section.
4. manufacturing method according to claim 1, it is characterised in that: contrast piece uses aluminum alloy bar.
CN201811471027.3A 2018-12-04 2018-12-04 Manufacturing method of medical titanium alloy inner fixing plate Active CN109299583B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111000626A (en) * 2019-10-17 2020-04-14 中南大学湘雅医院 Method for shaping medical titanium alloy inner fixing plate
CN113262033A (en) * 2021-06-28 2021-08-17 宁波兆盈医疗器械有限公司 Fibula far-end outside locking bone fracture plate and machining method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102230785A (en) * 2011-06-23 2011-11-02 上海大学 Indoor 3D (3-dimensional) dimension measurement method
US20130345850A1 (en) * 2011-03-07 2013-12-26 Finn-Power Italia S.R.L Procedure for controlling the shape of a complex metal profile obtained by a series of successive bendings of a sheet metal on a panel bender
CN107516098A (en) * 2017-07-30 2017-12-26 华南理工大学 A kind of objective contour 3-D information fetching method based on edge angle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130345850A1 (en) * 2011-03-07 2013-12-26 Finn-Power Italia S.R.L Procedure for controlling the shape of a complex metal profile obtained by a series of successive bendings of a sheet metal on a panel bender
CN102230785A (en) * 2011-06-23 2011-11-02 上海大学 Indoor 3D (3-dimensional) dimension measurement method
CN107516098A (en) * 2017-07-30 2017-12-26 华南理工大学 A kind of objective contour 3-D information fetching method based on edge angle

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111000626A (en) * 2019-10-17 2020-04-14 中南大学湘雅医院 Method for shaping medical titanium alloy inner fixing plate
CN111000626B (en) * 2019-10-17 2021-06-22 中南大学湘雅医院 Method for shaping medical titanium alloy inner fixing plate
CN113262033A (en) * 2021-06-28 2021-08-17 宁波兆盈医疗器械有限公司 Fibula far-end outside locking bone fracture plate and machining method thereof

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