CN112697416A - Method for testing structure stability of universal screw and bone plate - Google Patents
Method for testing structure stability of universal screw and bone plate Download PDFInfo
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- CN112697416A CN112697416A CN202011536828.0A CN202011536828A CN112697416A CN 112697416 A CN112697416 A CN 112697416A CN 202011536828 A CN202011536828 A CN 202011536828A CN 112697416 A CN112697416 A CN 112697416A
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- 238000012360 testing method Methods 0.000 title claims abstract description 214
- 238000000034 method Methods 0.000 title claims abstract description 32
- 210000000988 bone and bone Anatomy 0.000 title claims description 16
- 238000006073 displacement reaction Methods 0.000 claims abstract description 48
- 208000010392 Bone Fractures Diseases 0.000 claims abstract description 43
- 230000008569 process Effects 0.000 claims abstract description 11
- 230000006835 compression Effects 0.000 claims abstract description 6
- 238000007906 compression Methods 0.000 claims abstract description 6
- 238000013112 stability test Methods 0.000 claims description 8
- 230000003068 static effect Effects 0.000 abstract description 3
- 230000008859 change Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000002513 implantation Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Abstract
The invention discloses a method for testing the structural stability of a universal screw and a bone fracture plate, which is characterized by comprising the following steps: the method comprises the following steps: assembling a test sample, and locking the universal screw and the bone fracture plate; mounting a testing tool, namely mounting an upper testing tool on an upper connector of a testing machine, and mounting a lower testing tool on a lower connector of the testing machine; mounting test samples, namely fixing the bone fracture plate of 1 group of test samples on a test block; applying a vertical downward compression load to the universal screw body through the upper test tool by using a testing machine, and simultaneously continuously recording the load and displacement change; recording and outputting displacement and load data of the whole test process; and determining the limit load and the limit displacement, wherein the maximum value of the ordinate on the curve is the limit load, and the corresponding abscissa is the limit displacement. According to the invention, a static pressure is applied to the combined system through the test tool, the changes of the load and the displacement are recorded at the same time, data are output for analysis, and the stability performance of the structure under different locking angles is compared.
Description
Technical Field
The invention belongs to the technical field of medical instruments, and particularly relates to a method for testing the structural stability of a universal screw and a bone fracture plate.
Background
The locking bone plate screw system for orthopaedics internal fixation mainly comprises a locking screw and a bone plate, wherein the angle between the locking screw and the bone plate is preset. In order to achieve the best fixation effect of the locking screw implanted in the bone, it is required that the locking screw must be implanted in the bone in a specific direction; due to the differences of broken parts of the fracture and the shape of bones among different individuals, in clinical application, the locking bone plate screw system often has the contradiction that the set implantation direction and the optimal implantation direction between the locking screw and the steel plate are inconsistent, and the operation effect is influenced. The structural stability of the existing locking screw and bone fracture plate can not be known, so that whether the existing locking screw and bone fracture plate meets individual requirements or not can not be known, the operation effect is finally seriously influenced, and even multiple operations can be possibly caused.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for testing the structural stability of a universal screw and a bone fracture plate, which aims to overcome the defects of the prior art.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a universal screw and bone fracture plate structure stability test method is characterized in that: the method comprises the following steps:
the method comprises the following steps: assembling the test samples, namely locking the universal screw and the bone fracture plate, ensuring that the included angles between the central axis of the locked universal screw and the normal direction of a screw mounting hole of the bone fracture plate are respectively 0 degree, 5 degree, 10 degree and 15 degree, and completing 4 groups of test samples;
step two: mounting a testing tool, namely fixedly mounting an upper testing tool on an upper connector of a testing machine, and fixedly mounting a lower testing tool on a lower connector of the testing machine, so as to ensure that the central axis of the upper testing tool is aligned with the center of the testing machine;
step three: mounting test samples, namely fixing a bone fracture plate of 1 group of test samples on a test block, fixing the test block on a lower test fixture, ensuring that the longitudinal axis of the bone fracture plate is parallel to the central axis of a testing machine, adjusting the position between the test block and the lower test fixture, ensuring that the distance from a locking center of a universal screw and the bone fracture plate to the axis of the upper test fixture is 15mm, and fixing the lower test fixture and the testing machine;
step four: opening control software of a testing machine, editing a testing scheme, setting a testing control mode to be displacement control, and setting a loading rate to be 25mm/min, applying a vertical downward compression load to the universal screw body through an upper testing tool by using the testing machine, simultaneously and continuously recording load and displacement changes, and outputting load and displacement data of the whole testing process;
step five: according to the test scheme, starting the test, pressurizing the universal screw by using the testing machine through the upper test tool, and recording and outputting displacement and load data of the whole test process;
step six: repeating the third step, the fourth step and the fifth step to finish the stability test of the universal screw and other locking angle structures of the bone fracture plate;
step seven: and determining the limit load and the limit displacement, inputting the original load displacement data output by the testing machine into originPro2018 to obtain a displacement load curve, wherein the maximum value of the ordinate on the curve is the limit load, and the corresponding abscissa is the limit displacement.
The test block is in a U-shaped structure form, and a waist-shaped hole is formed in the test block.
The upper test tool is of a cylindrical rod-shaped structure.
The lower test fixture is of a rectangular plate-shaped structure.
The locked universal screw and the bone fracture plate are connected with a testing machine through the test block, the upper test tool and the lower test tool, and the included angles between the central axis of the universal screw and the normal direction of a screw mounting hole of the bone fracture plate are respectively 0 degree, 5 degree, 10 degree and 15 degree; then applying static pressure to the combined system through the upper test tool, simultaneously recording the changes of the load and the displacement, outputting data for analysis, and comparing the stability of the structure under different locking angles; assembling the test samples, namely locking the universal screw and the bone fracture plate, ensuring that the included angles between the central axis of the locked universal screw and the normal direction of a screw mounting hole of the bone fracture plate are respectively 0 degree, 5 degree, 10 degree and 15 degree, and completing 4 groups of test samples; mounting a testing tool, namely fixedly mounting an upper testing tool on an upper connector of a testing machine, and fixedly mounting a lower testing tool on a lower connector of the testing machine, so as to ensure that the central axis of the upper testing tool is aligned with the center of the testing machine; mounting test samples, namely fixing a bone fracture plate of 1 group of test samples on a test block, fixing the test block on a lower test fixture, ensuring that the longitudinal axis of the bone fracture plate is parallel to the central axis of a testing machine, adjusting the position between the test block and the lower test fixture, ensuring that the distance from a locking center of a universal screw and the bone fracture plate to the axis of the upper test fixture is 15mm, and fixing the lower test fixture and the testing machine; opening control software of a testing machine, editing a testing scheme, setting a testing control mode to be displacement control, and setting a loading rate to be 25mm/min, applying a vertical downward compression load to the universal screw body through an upper testing tool by using the testing machine, simultaneously and continuously recording load and displacement changes, and outputting load and displacement data of the whole testing process; according to the test scheme, starting the test, pressurizing the universal screw by using the testing machine through the upper test tool, and recording and outputting displacement and load data of the whole test process; repeating the operation to finish the stability test of the universal screw and other locking angle structures of the bone fracture plate; determining the limit load and the limit displacement, inputting original load displacement data output by the testing machine into originPro2018 to obtain a displacement load curve, wherein the maximum value of the ordinate on the curve is the limit load, and the corresponding abscissa is the limit displacement; the ultimate load is the maximum compressive load applied to the assembly (see the load at point a in fig. 2), representing the maximum force that the structure can resist to maintain stability, with a greater value indicating better stability.
The invention has the advantages that: the problem of material and performance change that wind generating set produced because freeze to and solve fatigue load grow and influence equipment use, for wind generating set safety, long-time operation work provide the guarantee, the biggest reduction blade freezes the equipment trouble problem that brings.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic view of the displacement load curve of the present invention.
Wherein the reference numerals are: the testing machine comprises an upper connector 1 of the testing machine, an upper testing tool 2, a universal screw 3, a bone fracture plate 4, a testing block 5, a lower testing tool 6 and a lower connector 7 of the testing machine.
Detailed Description
The following further describes embodiments of the present invention in conjunction with the attached figures:
a universal screw and bone fracture plate structure stability test method is characterized in that: the method comprises the following steps:
the method comprises the following steps: assembling the test samples, namely locking the universal screw 3 and the bone plate 4, ensuring that the included angles between the central axis of the locked universal screw 3 and the normal direction of a screw mounting hole of the bone plate 4 are respectively 0 degree, 5 degree, 10 degree and 15 degree, and totally assembling 4 groups of test samples;
step two: mounting a testing tool, namely fixedly mounting an upper testing tool 2 on an upper connector 1 of a testing machine, and fixedly mounting a lower testing tool 6 on a lower connector 7 of the testing machine, so as to ensure that the central axis of the upper testing tool 2 is aligned with the center of the testing machine;
step three: mounting test samples, namely fixing a bone fracture plate 4 of 1 group of test samples on a test block 5, fixing the test block 5 on a lower test fixture 6, ensuring that the longitudinal axis of the bone fracture plate 4 is parallel to the central axis of a testing machine, adjusting the position between the test block 5 and the lower test fixture 6, ensuring that the distance from the locking center of a universal screw 3 and the bone fracture plate 4 to the axis of an upper test fixture 2 is 15mm, and fixing the lower test fixture 6 and the testing machine;
step four: opening control software of a testing machine, editing a testing scheme, setting a testing control mode to be displacement control, and setting a loading rate to be 25mm/min, applying a vertical downward compression load to a universal screw body 3 through an upper testing tool 2 by using the testing machine, continuously recording load and displacement changes, and outputting load and displacement data of the whole testing process;
step five: according to the test scheme, starting the test, pressurizing the universal screw 3 by using the testing machine through the upper test tool 2, and recording and outputting displacement and load data of the whole test process;
step six: repeating the third step, the fourth step and the fifth step to finish the stability test of the other locking angle structures of the universal screw 3 and the bone fracture plate 4;
step seven: and determining the limit load and the limit displacement, inputting the original load displacement data output by the testing machine into originPro2018 to obtain a displacement load curve, wherein the maximum value of the ordinate on the curve is the limit load, and the corresponding abscissa is the limit displacement.
In the embodiment, the test block 5 is in a U-shaped structure form, and a waist-shaped hole is formed in the test block 5. The installation and the adjustment of the bone fracture plate 4 are convenient, and the operation efficiency is greatly improved.
In the embodiment, the upper test fixture 2 has a cylindrical rod-like structure. The connection of the upper test tool 2 and the upper joint 1 of the testing machine is facilitated, and meanwhile, the installation and adjustment of the universal screw 3 are facilitated.
In the embodiment, the lower test fixture 6 has a rectangular plate-shaped structure. The connection between the lower test tool 6 and the lower joint 7 of the testing machine is facilitated, and meanwhile, the installation and adjustment of the test block 5 are facilitated.
The locked universal screw 3 and the bone fracture plate 4 are connected with a testing machine through a test block 5, an upper test tool 2 and a lower test tool 6, and the included angles between the central axis of the universal screw 3 and the normal direction of a screw mounting hole of the bone fracture plate 4 are respectively 0 degree, 5 degree, 10 degree and 15 degree; then applying static pressure to the combined system through the upper test tool 2, simultaneously recording the changes of load and displacement, outputting data for analysis, and comparing the stability of the structure at different locking angles; assembling the test samples, namely locking the universal screw 3 and the bone plate 4, ensuring that the included angles between the central axis of the locked universal screw 3 and the normal direction of a screw mounting hole of the bone plate 4 are respectively 0 degree, 5 degree, 10 degree and 15 degree, and totally assembling 4 groups of test samples; mounting a testing tool, namely fixedly mounting an upper testing tool 2 on an upper connector 1 of a testing machine, and fixedly mounting a lower testing tool 6 on a lower connector 7 of the testing machine, so as to ensure that the central axis of the upper testing tool 2 is aligned with the center of the testing machine; mounting test samples, namely fixing a bone fracture plate 4 of 1 group of test samples on a test block 5, fixing the test block 5 on a lower test fixture 6, ensuring that the longitudinal axis of the bone fracture plate 4 is parallel to the central axis of a testing machine, adjusting the position between the test block 5 and the lower test fixture 6, ensuring that the distance from the locking center of a universal screw 3 and the bone fracture plate 4 to the axis of an upper test fixture 2 is 15mm, and fixing the lower test fixture 6 and the testing machine; opening control software of a testing machine, editing a testing scheme, setting a testing control mode to be displacement control, and setting a loading rate to be 25mm/min, applying a vertical downward compression load to the universal screw 1 through an upper testing tool 2 by using the testing machine, simultaneously continuously recording load and displacement changes, and outputting load and displacement data of the whole testing process; according to the test scheme, starting the test, pressurizing the universal screw 3 by using the testing machine through the upper test tool 2, and recording and outputting displacement and load data of the whole test process; repeating the operation to finish the stability test of the other locking angle structures of the universal screw 3 and the bone fracture plate 4; determining the limit load and the limit displacement, inputting original load displacement data output by the testing machine into originPro2018 to obtain a displacement load curve, wherein the maximum value of the ordinate on the curve is the limit load, and the corresponding abscissa is the limit displacement; the ultimate load is the maximum compressive load applied to the assembly (see the load at point a in fig. 2), representing the maximum force that the structure can resist to maintain stability, with a greater value indicating better stability.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (4)
1. A universal screw and bone fracture plate structure stability test method is characterized in that: the method comprises the following steps:
the method comprises the following steps: assembling test samples, namely locking the universal screw (3) and the bone fracture plate (4) to ensure that the included angles between the central axis of the locked universal screw (3) and the normal direction of a screw mounting hole of the bone fracture plate (4) are respectively 0 degree, 5 degree, 10 degree and 15 degree, and completing 4 groups of test samples;
step two: mounting a testing tool, namely fixedly mounting an upper testing tool (2) on an upper connector (1) of a testing machine, and fixedly mounting a lower testing tool (6) on a lower connector (7) of the testing machine, so as to ensure that the central axis of the upper testing tool (2) is aligned with the center of the testing machine;
step three: mounting test samples, namely fixing a bone fracture plate (4) of 1 group of test samples on a test block (5), fixing the test block (5) on a lower test fixture (6), ensuring that the longitudinal axis of the bone fracture plate (4) is parallel to the central axis of a testing machine, adjusting the position between the test block (5) and the lower test fixture (6), ensuring that the distance from the locking center of a universal screw (3) and the bone fracture plate (4) to the axis of an upper test fixture (2) is 15mm, and fixing the lower test fixture (6) and the testing machine;
step four: opening control software of a testing machine, editing a testing scheme, setting a testing control mode to be displacement control, and setting a loading rate to be 25mm/min, applying a vertical downward compression load to a universal screw (3) body through an upper testing tool (2) by using the testing machine, simultaneously continuously recording load and displacement changes, and outputting load and displacement data of the whole testing process;
step five: according to the test scheme, starting the test, pressurizing the universal screw (3) by using the testing machine through the upper test tool (2), and recording and outputting displacement and load data of the whole test process;
step six: repeating the third step, the fourth step and the fifth step to finish the stability test of the other locking angle structures of the universal screw (3) and the bone fracture plate (4);
step seven: and determining the limit load and the limit displacement, inputting the original load displacement data output by the testing machine into originPro2018 to obtain a displacement load curve, wherein the maximum value of the ordinate on the curve is the limit load, and the corresponding abscissa is the limit displacement.
2. The method for testing the structural stability of the universal screw and the bone plate according to claim 1, wherein the method comprises the following steps: the test block (5) is in a U-shaped structure form, and a waist-shaped hole is formed in the test block (5).
3. The method for testing the structural stability of the universal screw and the bone plate according to claim 1, wherein the method comprises the following steps: the upper test tool (2) is of a cylindrical rod-shaped structure.
4. The method for testing the structural stability of the universal screw and the bone plate according to claim 1, wherein the method comprises the following steps: the lower test tool (6) is of a rectangular plate-shaped structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011536828.0A CN112697416A (en) | 2020-12-23 | 2020-12-23 | Method for testing structure stability of universal screw and bone plate |
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| CN202011536828.0A CN112697416A (en) | 2020-12-23 | 2020-12-23 | Method for testing structure stability of universal screw and bone plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114001945A (en) * | 2021-11-02 | 2022-02-01 | 上海视疆科学仪器有限公司 | Method for automatically judging self-tapping point in self-tapping experiment of metal bone screw |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008116203A2 (en) * | 2007-03-22 | 2008-09-25 | Marctec, Llc | Methods and devices for intracorporeal bonding or interlocking of implants with thermal energy |
| CN102961179A (en) * | 2012-12-03 | 2013-03-13 | 浙江科惠医疗器械有限公司 | Universal locking and pressurizing bone plate |
| CN109142036A (en) * | 2018-10-19 | 2019-01-04 | 浙江德康医疗器械有限公司 | A kind of vertebral plate fixed plate static system bending compression test method |
| CN110296903A (en) * | 2019-07-17 | 2019-10-01 | 山东省医疗器械产品质量检验中心 | Special-shaped bone plate Mechanics Performance Testing harness and test method |
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2020
- 2020-12-23 CN CN202011536828.0A patent/CN112697416A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008116203A2 (en) * | 2007-03-22 | 2008-09-25 | Marctec, Llc | Methods and devices for intracorporeal bonding or interlocking of implants with thermal energy |
| CN102961179A (en) * | 2012-12-03 | 2013-03-13 | 浙江科惠医疗器械有限公司 | Universal locking and pressurizing bone plate |
| CN109142036A (en) * | 2018-10-19 | 2019-01-04 | 浙江德康医疗器械有限公司 | A kind of vertebral plate fixed plate static system bending compression test method |
| CN110296903A (en) * | 2019-07-17 | 2019-10-01 | 山东省医疗器械产品质量检验中心 | Special-shaped bone plate Mechanics Performance Testing harness and test method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114001945A (en) * | 2021-11-02 | 2022-02-01 | 上海视疆科学仪器有限公司 | Method for automatically judging self-tapping point in self-tapping experiment of metal bone screw |
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Application publication date: 20210423 |