CN114001945A - Method for automatically judging self-tapping point in self-tapping experiment of metal bone screw - Google Patents
Method for automatically judging self-tapping point in self-tapping experiment of metal bone screw Download PDFInfo
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- CN114001945A CN114001945A CN202111290942.4A CN202111290942A CN114001945A CN 114001945 A CN114001945 A CN 114001945A CN 202111290942 A CN202111290942 A CN 202111290942A CN 114001945 A CN114001945 A CN 114001945A
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- 238000010079 rubber tapping Methods 0.000 title claims abstract description 100
- 210000000988 bone and bone Anatomy 0.000 title claims abstract description 48
- 238000002474 experimental method Methods 0.000 title claims abstract description 42
- 239000002184 metal Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000006073 displacement reaction Methods 0.000 claims abstract description 21
- 238000012417 linear regression Methods 0.000 claims abstract description 9
- 238000012360 testing method Methods 0.000 claims description 22
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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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
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
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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
- A61B2017/00681—Aspects not otherwise provided for
- A61B2017/00725—Calibration or performance testing
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- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
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- Animal Behavior & Ethology (AREA)
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Abstract
The method for automatically judging the self-tapping point in the self-tapping experiment of the metal bone screw comprises the following steps: carrying out a pre-experiment on a metal bone screw with a certain specification and type, and recording time-displacement data; extracting data of a predetermined time period in the time-displacement data, wherein the predetermined time period comprises the occurrence time of the tapping point; fitting a trend line of a time-displacement data curve by utilizing a linear regression method according to the extracted data of the preset time period to obtain a threshold slope k; and carrying out a self-tapping experiment on the metal bone screw to obtain a trend line slope k ', and automatically judging as a self-tapping point at a time point when k' is greater than or equal to a threshold slope k. The method improves the efficiency and accuracy of the experiment, reduces the labor intensity and has better consistency.
Description
Technical Field
The invention relates to the field of testing, in particular to a method for automatically judging a self-tapping point in a self-tapping experiment of a metal bone screw.
Background
At present, in the screw self-tapping experiment operation, a tester usually visually observes that the test torque or displacement curve has self-tapping characteristic feedback meeting the standard description and then manually controls a test device to stop increasing the axial load force and keeps the load force until the test is finished. The method for manually judging the start of self-tapping of the screw determines that a self-tapping point is easily influenced by test data fluctuation to cause misjudgment by observing the real-time change of a test torque curve or a displacement curve; and generally, the time when the self-tapping point appears is later than the actual self-tapping starting time through manual judgment under the influence of observation and operation, and the discrete degree is judged to be large through multiple times of tests. Therefore, how to improve the experimental efficiency, accuracy and/or consistency is an urgent problem to be solved.
Therefore, there is a need to develop a method for automatically determining a tapping point in a tapping experiment of a metal bone screw to solve one or more of the above-mentioned technical problems.
Disclosure of Invention
In order to solve at least one of the above technical problems, according to an aspect of the present invention, there is provided a method for automatically determining a tapping point in a self-tapping experiment for a metal bone screw, which includes analyzing a pre-experiment time-torque curve or a time-displacement curve to calculate a set of curve slope threshold values and time parameters, determining the slope of the curve according to the time parameters in real time during the experiment, and automatically setting a time when the threshold values are satisfied as a tapping start time.
Particularly, the method for automatically judging the self-tapping point in the self-tapping experiment of the metal bone screw is characterized by comprising the following steps of:
carrying out a pre-experiment on a metal bone screw with a certain specification and type, and recording time-displacement data;
extracting data of a predetermined time period in the time-displacement data, wherein the predetermined time period comprises the occurrence time of the tapping point;
fitting a trend line of a time-displacement data curve by utilizing a linear regression method according to the extracted data of the preset time period to obtain a slope of the trend line, and taking the slope of the trend line as a threshold slope k for self-tapping point judgment;
and performing a self-tapping experiment on the metal bone screw, fitting time-displacement data in a preset time period by using a linear regression method when the metal bone screw is judged to be of a certain specification and type to obtain a trend line slope k ', automatically judging as a self-tapping point at a time point when the k' is greater than or equal to a threshold slope k, stopping increasing the axial load of the metal bone screw at the self-tapping point, keeping the load force at the self-tapping point till the experiment is finished, and taking the load force as the self-tapping force.
According to still another aspect of the present invention, the predetermined period of time is 1 second before and after the tapping point occurrence timing.
According to still another aspect of the present invention, the timing of the occurrence of the self-tapping point is determined by an experienced person in the pre-experiment.
According to yet another aspect of the present invention, the time-displacement data is replaced with time-torque data.
According to yet another aspect of the present invention, a plurality of specifications and types of metallic bone screws are pre-experimented with to obtain a corresponding threshold slope k, and the threshold slope k and the corresponding specifications and types are stored in a database.
According to yet another aspect of the present invention, a metallic bone screw self-tapping experiment is conducted by searching the database for a threshold slope k corresponding to the gauge and type of metallic bone screw.
According to another aspect of the present invention, there is also provided a method for self-tapping experiments of metallic bone screws, characterized by comprising the steps of:
automatically judging the self-tapping point according to the method;
automatically controlling the load applying device to stop increasing the axial load of the metal bone screw at the self-tapping point controller;
the load force at the time of this tapping point was held until the end of the experiment, and this load force was used as the tapping force.
The invention can obtain one or more of the following technical effects:
1. the testing efficiency is improved.
2. The accuracy of the test is improved, and the labor intensity is reduced.
3. The experimental result has better consistency needle, and the test results of all the metal bone screws are comparable, thereby being beneficial to obtaining effective test results.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of time-torque data and trend lines (dashed lines) in the vicinity of a tapping point in a self-tapping experiment of a metallic bone screw according to a preferred embodiment of the present invention.
Fig. 2 is a graph showing the results of an automatic screw tapping judgment test using a threshold slope as a parameter according to a preferred embodiment of the present invention.
Detailed Description
The best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings, wherein the detailed description is for the purpose of illustrating the invention in detail, and is not to be construed as limiting the invention, as various changes and modifications can be made therein without departing from the spirit and scope thereof, which are intended to be encompassed within the appended claims.
Example 1
According to a preferred embodiment of the present invention, there is provided a method for automatically judging a tapping point in a self-tapping experiment of a metal bone screw, comprising the steps of:
carrying out a pre-experiment on a metal bone screw with a certain specification and type, and recording time-displacement data;
extracting data of a predetermined time period in the time-displacement data, wherein the predetermined time period comprises the occurrence time of the tapping point;
fitting a trend line of a time-displacement data curve by utilizing a linear regression method according to the extracted data of the preset time period to obtain a slope of the trend line, and taking the slope of the trend line as a threshold slope k for self-tapping point judgment;
and performing a self-tapping experiment on the metal bone screw, fitting time-displacement data in a preset time period by using a linear regression method when the metal bone screw is judged to be of a certain specification and type to obtain a trend line slope k ', automatically judging as a self-tapping point at a time point when the k' is greater than or equal to a threshold slope k, stopping increasing the axial load of the metal bone screw at the self-tapping point, keeping the load force at the self-tapping point till the experiment is finished, and taking the load force as the self-tapping force.
Advantageously, the method is simple to implement, high in accuracy and strong in consistency, and can be used for judging the self-tapping points of various metal bone screws in the self-tapping test.
According to still another preferred embodiment of the present invention, the predetermined period of time is 1 second before and after the tapping point occurrence time.
According to a further preferred embodiment of the invention, the moment of occurrence of the tapping point is determined in the preliminary experiment by an experienced person.
According to a further preferred embodiment of the invention, the time-displacement data is replaced by time-torque data.
According to another preferred embodiment of the present invention, a plurality of specifications and types of metallic bone screws are pre-experimented with to obtain corresponding threshold slopes k, and the threshold slopes k and the corresponding specifications and types are stored in a database.
According to a further preferred embodiment of the invention, when a self-tapping experiment of metallic bone screws is performed, a threshold slope k corresponding to the specification and type of metallic bone screw is looked up from said database.
According to another preferred embodiment of the present invention, there is provided a method for self-tapping experiments of metallic bone screws, characterized by comprising the steps of:
automatically judging the self-tapping point according to the method;
automatically controlling the load applying device to stop increasing the axial load of the metal bone screw at the self-tapping point controller;
the load force at the time of this tapping point was held until the end of the experiment, and this load force was used as the tapping force.
According to another preferred embodiment of the present invention, there is provided a method for automatically judging a tapping point in a self-tapping experiment of a metal bone screw, comprising the steps of:
1) taking one of self-tapping screws with the same specification to perform a screw self-tapping experiment, determining a self-tapping point in a manually selected mode, and simultaneously recording time-torque data;
2) extracting data of 1s before and after the self-tapping point appears in the time-torque data collected in the step 1);
3) fitting a trend line of the time-torque data curve (the curve near the self-tapping point) in the step 2) by using a linear regression method to obtain the slope of the trend line, and using the slope as a threshold slope k for judging the self-tapping point;
4) in other screw self-tapping experiments of the same specification, linear regression method is carried out on time-torque data in set calculation time to obtain trend line slope k ', when a time point that k' is greater than or equal to k is judged as a self-tapping behavior occurrence time point, axial load increase is stopped at the time point, and the load force at the moment is kept until the experiment is finished, and the load force is taken as self-tapping force.
Referring to fig. 1-2, there are shown time-torque data and a trend line (dotted line) plot in the vicinity of a tapping point in a tapping experiment for a metal bone screw, and results of an automatic screw tapping judgment experiment using a threshold slope as a parameter.
The invention can obtain one or more of the following technical effects:
1. the testing efficiency is improved.
2. The accuracy of the test is improved, and the labor intensity is reduced.
3. The experimental result has better consistency needle, and the test results of all the metal bone screws are comparable, thereby being beneficial to obtaining effective test results.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A method for automatically judging a self-tapping point in a self-tapping experiment of a metal bone screw is characterized by comprising the following steps of:
carrying out a pre-experiment on a metal bone screw with a certain specification and type, and recording time-displacement data;
extracting data of a predetermined time period in the time-displacement data, wherein the predetermined time period comprises the occurrence time of the tapping point;
fitting a trend line of a time-displacement data curve by utilizing a linear regression method according to the extracted data of the preset time period to obtain a slope of the trend line, and taking the slope of the trend line as a threshold slope k for self-tapping point judgment;
and performing a self-tapping experiment on the metal bone screw, fitting time-displacement data in a preset time period by using a linear regression method when the metal bone screw is judged to be of a certain specification and type to obtain a trend line slope k ', automatically judging as a self-tapping point at a time point when the k' is greater than or equal to a threshold slope k, stopping increasing the axial load of the metal bone screw at the self-tapping point, keeping the load force at the self-tapping point till the experiment is finished, and taking the load force as the self-tapping force.
2. The method for automatically judging a tapping point in a self-tapping experiment for a metallic bone screw as set forth in claim 1, wherein said predetermined period of time is 1 second before and after the moment of occurrence of the tapping point.
3. A method for automatically determining a tapping point in a self-tapping metallic bone screw test as set forth in claim 2, wherein the moment of occurrence of the tapping point is determined by a highly experienced person in the preliminary test.
4. A method for automatically determining a tapping point in a self-tapping metallic bone screw test according to any one of claims 1 to 3, wherein said time-displacement data is replaced with time-torque data.
5. The method of claim 4, wherein the metallic bone screws of different specifications and types are pre-tested to obtain corresponding threshold slopes k, and the threshold slopes k and the corresponding specifications and types are stored in a database.
6. The method of automatically determining a tapping point in a self-tapping metallic bone screw test as recited in claim 5, wherein a threshold slope k corresponding to the gauge and type of metallic bone screw is looked up from said database when performing the self-tapping metallic bone screw test.
7. A method for a self-tapping experiment of a metal bone screw is characterized by comprising the following steps:
performing automatic judgment of a self-tapping point according to the method of any one of claims 1 to 6;
automatically controlling the load applying device to stop increasing the axial load of the metal bone screw at the self-tapping point controller;
the load force at the time of this tapping point was held until the end of the experiment, and this load force was used as the tapping force.
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| CN202111290942.4A CN114001945B (en) | 2021-11-02 | 2021-11-02 | Method for automatically judging self-tapping point in metal bone screw self-tapping experiment |
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| CN202111290942.4A CN114001945B (en) | 2021-11-02 | 2021-11-02 | Method for automatically judging self-tapping point in metal bone screw self-tapping experiment |
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