CN109323946A - A kind of artificial knee joint friction wear testing machine - Google Patents
A kind of artificial knee joint friction wear testing machine Download PDFInfo
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- CN109323946A CN109323946A CN201811045197.5A CN201811045197A CN109323946A CN 109323946 A CN109323946 A CN 109323946A CN 201811045197 A CN201811045197 A CN 201811045197A CN 109323946 A CN109323946 A CN 109323946A
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- knee joint
- testing machine
- artificial knee
- femur fragment
- bone segment
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/56—Investigating resistance to wear or abrasion
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/005—Electromagnetic means
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Prostheses (AREA)
Abstract
The present invention relates to a kind of artificial knee joint friction wear testing machines, including knee joint sample, the sample upper section is femur fragment, lower section is tibial bone segment, pass through hemispheric simulation ball and socket joint and its groove cooperation to match between the femur fragment and tibial bone segment, the upper end of the femur fragment is equipped with longitudinal force application apparatus via gripper mechanism grips and its top, the lower end of the tibial bone segment is held in solution basin via clamp system, and the lower end of the femur fragment and the upper end of tibial bone segment are respectively positioned in the solution of solution basin；The outside of the femur fragment is equipped with connecting rod and it is driven to carry out twist motion, drives and swings via hydraulic stem outside the solution basin.The present invention simulates the real motion of human body knee joint using electronic, the hydraulic and mechanical design method combined.The load that knee joint is born when hydraulic system provides simulation human motion, and load is detected and fed back using pressure sensor, data, which are provided, for analysis of experiments supports.
Description
Technical field
The present invention relates to a kind of joint prosthesis friction wear testing machines, are particularly suitable for simulation artificial knee joint physiological movement
Feature, the testing machine that friction-wear test can be carried out to joint prosthesis.
Background technique
Among each joint of human body, knee joint is a wherein important ring.It is to be responsible for receiving in human body lower limbs part
One of joint of weight.Most of movements of human body, there is kneed participation.In actual motion, need relatively high
Motor function.Chinese gonarthrosis patient at present is many, probably there is 3600~40,000,000 gonitis patient, and
Wherein needing the patient for carrying out replacement knee in arthroplasty treatment probably has 100~1,500,000, in addition to because of disease, largely by
The patient of contingency, it is also desirable to carry out replacement operation.Artificial knee joint structure is complicated and relatively large sized one
Joint.Be mounted on the intracorporal artificial knee joint of people during the motion can loss slowly, and fretting wear is then to cause to be lost
The main reason for.During the motion, relative motion is had between the condyle of femur and tibia support of artificial knee joint.Artificial knee joint
Friction is had between mounting surface and mating surface, and this friction can allow artificial knee joint to gradually wear out, and then have clast generation,
These clasts can be filled among the gap in artificial knee joint, and clast is phagocytized by cells and promotes histiocytic generation.?
During this, a kind of new metabolic by-product can also generate therewith, and the osteoclast on by-product periphery can be convened and be activated,
So that metabolic by-product is absorbed by human body bone itself, bone loss is caused.After accumulation to a certain extent, artificial knee joint meeting
Gap is generated, so as to cause loosening.During actual motion, the fretting wear between artificial knee joint building block is can not
It avoids.In order to study the abrasion and life problems of artificial knee joint, need to carry out simulation test to its fretting wear situation, from
And authentic and valid test data is provided for the selection of artificial knee joint material, to raising artificial knee joint quality, service life etc.
With important practical usage.
Joint prosthesis friction wear testing machine can be divided into uniaxial and two types of multiaxis.Come relative to uniaxial testing machine
It says, relatively broad is fountain type.Because multiaxial experiment machine can be applied from different perspectives according to each axis different power to
The different size of resultant force of all directions is generated, the different motion in each plane in joint can be simulated, test can be enabled to level off in this way
True movement environment.Fountain type testing machine can accurately measure the frictional behaviour of artificial knee joint.The artificial pass in China now
Section technology is in low-level state, and most of testing machine depends on import.It is independent to develop the artificial pass for belonging to China
Friction wear testing machine is saved, the frictional behaviour of joint prosthesis can be intuitively investigated.Compatibility, associativity to joint prosthesis
Energy, degradability etc. also have further understanding.The research for the problems such as testing selection, the manufacturing process to artificial joint material
There is very big reality to influence, so as to improve joint prosthesis, allow to produce with wear-resisting, long service life, by
The bigger joint prosthesis of power.Strong guarantee is provided for replacement operation, greatly improves success rate of operation, mitigates patient's pain
It is bitter.
Summary of the invention
The present invention according to the shortcoming of existing joint prosthesis friction wear testing machine, propose a kind of simple structure, processing,
Biaxial type joint prosthesis friction wear testing machine easy to assembly, at low cost, that compound knee joint movement can be simulated completely.
To achieve the above object, the invention provides the following technical scheme:
A kind of artificial knee joint friction wear testing machine, including knee joint sample, the sample upper section are femur fragment, and lower section is shin
Bone section passes through hemispheric simulation ball and socket joint and its groove cooperation to match, the stock between the femur fragment and tibial bone segment
The upper end of bone section is equipped with longitudinal force application apparatus via gripper mechanism grips and its top, and the lower end of the tibial bone segment is via clamping machine
Structure is held in solution basin, and the lower end of the femur fragment and the upper end of tibial bone segment are respectively positioned in the solution of solution basin；The femur
The outside of section is equipped with connecting rod and it is driven to carry out twist motion, drives and swings via hydraulic stem outside the solution basin.
The top of the femur fragment is equipped with hydraulic cylinder, and the piston rod of the hydraulic cylinder is down-set and coaxially connects with main shaft
It connects, is clamped outside the upper end of the femur fragment by chuck, pillar pressure sensor is equipped with above the chuck, the main shaft
Lower end forces in the upper surface center of the pillar pressure sensor.
The tibial bone segment lower end is clamped using the clamp system of screw-driving, and the clamp system is fixed by screws in molten
Inside liquid basin.
The main shaft lower end is rounded corner end, and the upper surface center of the pillar pressure sensor sensor is equipped with and main shaft
The groove that lower end matches.
The piston rod and main shaft of the hydraulic cylinder are sleeved on inside guide sleeve.
Angular contact ball bearing is equipped between the pillar pressure sensor and chuck.
The top of the chuck is equipped with the connecting rod of horizontal extension, and the connecting rod is driven by the output shaft of motor, described
The lower end of the output shaft of motor is equipped with eccentric wheel, and described connecting rod one end is connect with eccentric wheel, the outer rim connection of one end and chuck.
The solution basin is equipped with a smooth downward projection of bottom, and one and its bottom phase are equipped with below solution basin
Matched pedestal, the upper edge of the solution basin are equipped with the extension of an extension, and the lower section of the extension is used equipped with hydraulic stem
It is pushed and pulled in it, it is hinged between the upper end and extension of the hydraulic stem.
It is rack outside the testing machine, hydraulic cylinder, motor are all set in rack.
Compared with prior art, the beneficial effects of the present invention are:
1. the present invention carries out mould using real motion of electronic, the hydraulic and mechanical design method combined to human body knee joint
It is quasi-.The load that knee joint is born when hydraulic system provides simulation human motion, and load is examined using pressure sensor
It surveys and feeds back, provide data for analysis of experiments and support.
2. testing machine structure is simple, processing, it is easy to assembly, at low cost, knee joint can be simulated completely under environment indoors
Compound motion, and controllable component motion makes some independent role or collective effect, realizes the flexible and changeable fortune of knee joint
Dynamic characteristic.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of artificial knee joint friction wear testing machine of the present invention.
Fig. 2 is the top view of Fig. 1.
In figure, 1- hydraulic cylinder；2- screw；3- guide sleeve；4- main shaft；5- pillar pressure sensor；6- angular contact ball bearing；
7- chuck；8- knee joint sample；801 be femur fragment, and 802 be tibial bone segment；9- clamp system；10- screw；11- screw；12- is molten
Liquid basin；13- pedestal；14- frame；15- motor；16- connecting rod；17- eccentric wheel；18- pin；19- hydraulic stem.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention 1-2, technical solution in the embodiment of the present invention carry out it is clear,
It is fully described by, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
The invention discloses a kind of artificial knee joint friction wear testing machine, including knee joint sample 8, on the sample 8
Section is femur fragment 801, and lower section is tibial bone segment 802, is closed between the femur fragment 801 and tibial bone segment 802 by hemispheric simulation
Section header 803 and its groove to match cooperation, the upper end of the femur fragment 801 are equipped with vertical via gripper mechanism grips and its top
To force application apparatus, the lower end of the tibial bone segment 802 is held in solution basin 12 via clamp system, under the femur fragment 801
End and the upper end of tibial bone segment are respectively positioned in the solution of solution basin 12；The outside of the femur fragment 801 is equipped with connecting rod 16 and drives thereon
End carries out twist motion, drives and swings via hydraulic stem 19 outside the solution basin.Femur fragment 801 is simulated with tibial bone segment 802
Kneed primary structure fills lubricating fluid, the people of lubricating fluid analog artificial knee joint during the motion in solution basin 12
Body physiological environment.It is exerted a force by longitudinal force application apparatus to femur fragment 801, different human body weights can be simulated.Meanwhile passing through
Connecting rod 16 drives femur fragment to carry out twist motion, and drives tibial bone segment 801 and femur fragment 801 indirectly by solution basin 12
Lower end is swung, and comprehensive simulates kneed fretting wear situation.
The top of the femur fragment 801 is equipped with hydraulic cylinder 1, and the piston rod of the hydraulic cylinder 1 is down-set and same with main shaft 4
The upper end outside of axis connection, the femur fragment 801 is clamped by chuck 7, and pillar pressure sensor 5 is equipped with above the chuck 7,
The lower end of the main shaft 4 forces in the upper surface center of the pillar pressure sensor 5.
Lower half portion joint prosthesis sample is clamped using the clamp system 9 that screw 10 is tightened.Clamp system 9 passes through screw 11
It is fixed on inside solution basin 12.The design of clamp system 9 can facilitate the dismounting and change of artificial knee joint sample.
4 lower end of main shaft is rounded corner end, and the upper surface center of the pillar pressure sensor sensor 5 is equipped with and master
The groove that 4 lower end of axis matches.
The piston rod and main shaft 4 of the hydraulic cylinder 1 are sleeved on inside guide sleeve 3.
The piston rod and main shaft 4 of hydraulic cylinder 1 are respectively fitted over inside guide sleeve 3, and guide sleeve 3 can prevent the work of hydraulic cylinder 1
The offset of position occurs between plug cylinder and main shaft 4, it is ensured that the load that hydraulic cylinder 1 is applied can uniformly and effectively be conducted in main shaft
On 4.By the variation of 1 internal oil pressure of hydraulic cylinder of mechanism upper end, pushing hydraulic cylinder 1, piston moves downward, to generate load
Lotus, this is kneed stress condition.The load that hydraulic cylinder 1 is applied can be changed according to test requirements document.It is under main shaft 4
Pillar pressure sensor 5, the groove inside 5 upper end of chamfering and pillar pressure sensor that the two passes through 4 bottom of main shaft are matched
It closes, can equally guarantee uniformly being effectively conducted for load.Pillar pressure sensor 5, which can be measured explicitly, finally to be acted on manually
Load on knee joint provides data support for the data analysis of test.
It is equipped with angular contact ball bearing 6 between the pillar pressure sensor 5 and chuck 7, can effectively ensure that 7 energy of chuck in this way
Pillar pressure sensor 5 and its above section not will do it rotation while driving knee joint sample 8 to twist.
The top of the chuck 7 is equipped with the connecting rod 16 of horizontal extension, and the connecting rod 16 passes through the output shaft band of motor 15
Dynamic, the lower end of the output shaft of the motor 15 is equipped with eccentric wheel 17, and described 16 one end of connecting rod is connect with eccentric wheel 17, one end and
The outer rim of chuck 7 connects.The twisting of knee joint a small range drives by additional motor 15.
The solution basin 12 is equipped with a smooth downward projection of bottom, and one and its bottom are equipped with below solution basin 12
The pedestal 13 that portion matches, the upper edge of the solution basin 12 are equipped with the extension 1201 of an extension, the extension 1201
Lower section is equipped with hydraulic stem 19 for pushing and pulling to it, passes through pin 18 between the upper end and extension 1201 of the hydraulic stem 19
Hingedly.12 bottom of solution basin and 13 upper end depressed section of pedestal are all the arc of same Radius.By being connected in 12 left end of solution basin
Hydraulic stem 19 bend and stretch, drive solution basin 12 to be swung on pedestal 13, to realize artificial knee joint in vertical side
To reciprocally swinging.Hydraulic stem 19 can choose different size, and length is bent and stretched needed for mixing up in advance and is normally transported to reach knee joint
Dynamic angular range.Testing machine applies load by hydraulic cylinder 1 in the present invention, and motion parts pass through motor 15 and hydraulic stem 19
Two driving links are realized.Two movements being independent of each other can simulate knee individually or together according to test requirements document and close practical fortune
It is dynamic.Influence situation of each component motion to artificial knee joint fretting wear in motion of knee joint can accurately be analyzed.
It is rack 14 outside the testing machine, hydraulic cylinder 1, motor 15 are all set in rack 14.
In the present invention, the movement of femur fragment 801, tibial bone segment 802 is independently driven by motor and hydraulic stem.Pass through tune
The radius size of whole eccentric wheel and chuck junction, the reciprocally swinging converted circular motion in 0 to 5 °.It is hydraulic by adjusting
Bar bends and stretches range, and solution basin is driven to carry out the swing in 0 to 70 °.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (9)
1. a kind of artificial knee joint friction wear testing machine, including knee joint sample (8), sample (8) upper section is femur fragment
(801), lower section is tibial bone segment (802), passes through hemispheric simulation joint between the femur fragment (801) and tibial bone segment (802)
Head (803) and its groove to match cooperation, it is characterised in that: the upper end of the femur fragment (801) is via gripper mechanism grips
And its top is equipped with longitudinal force application apparatus, the lower end of the tibial bone segment (802) is held in solution basin (12) via clamp system,
The lower end of the femur fragment (801) and the upper end of tibial bone segment are respectively positioned in the solution of solution basin (12)；The femur fragment (801)
Outside is equipped with connecting rod (16) and it is driven to carry out twist motion, drives and swings via hydraulic stem (19) outside the solution basin.
2. a kind of artificial knee joint friction wear testing machine according to claim 1, it is characterised in that: the femur fragment
(801) top is equipped with hydraulic cylinder (1), and the piston rod of the hydraulic cylinder (1) is down-set and coaxially connected with main shaft (4), institute
It states and is clamped outside the upper end of femur fragment (801) by chuck (7), be equipped with pillar pressure sensor (5) above the chuck (7),
The lower end of the main shaft (4) forces in the upper surface center of the pillar pressure sensor (5).
3. a kind of artificial knee joint friction wear testing machine according to claim 1, it is characterised in that: the tibial bone segment
(802) lower end is clamped using the clamp system (9) that screw (10) are tightened, and the clamp system (9) is fixed on by screw (11)
Solution basin (12) is internal.
4. a kind of artificial knee joint friction wear testing machine according to claim 2, it is characterised in that: the main shaft (4)
Lower end is rounded corner end, and the upper surface center of the pillar pressure sensor sensor (5) is equipped with to match with main shaft (4) lower end
Groove.
5. a kind of artificial knee joint friction wear testing machine according to claim 2, it is characterised in that: the hydraulic cylinder
(1) it is internal that piston rod and main shaft (4) is sleeved on guide sleeve (3).
6. a kind of artificial knee joint friction wear testing machine according to claim 2, it is characterised in that: the pillar pressure
Angular contact ball bearing (6) are equipped between sensor (5) and chuck (7).
7. a kind of artificial knee joint friction wear testing machine according to claim 2, it is characterised in that: the chuck (7)
Top be equipped with the connecting rod (16) of horizontal extension, the connecting rod (16) is driven by the output shaft of motor (15), described electronic
The lower end of the output shaft of machine (15) is equipped with eccentric wheel (17), and described connecting rod (16) one end is connect with eccentric wheel (17), one end and card
The outer rim of disk (7) connects.
8. a kind of artificial knee joint friction wear testing machine according to claim 1, it is characterised in that: the solution basin
(12) it is equipped with a smooth downward projection of bottom, a pedestal to match with its bottom is equipped with below solution basin (12)
(13), the upper edge of the solution basin (12) is equipped with the extension (1201) of an extension, sets below the extension (1201)
There are hydraulic stem (19) for pushing and pulling to it, it is hinged between the upper end and extension (1201) of the hydraulic stem (19).
9. a kind of artificial knee joint friction-wear test described in any claim into claim 7 according to claim 1
Machine, it is characterised in that: be rack (14) outside the testing machine, hydraulic cylinder (1), motor (15) are all set in rack (14)
On.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811045197.5A CN109323946A (en) | 2018-09-07 | 2018-09-07 | A kind of artificial knee joint friction wear testing machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811045197.5A CN109323946A (en) | 2018-09-07 | 2018-09-07 | A kind of artificial knee joint friction wear testing machine |
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| CN109323946A true CN109323946A (en) | 2019-02-12 |
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| CN201811045197.5A Pending CN109323946A (en) | 2018-09-07 | 2018-09-07 | A kind of artificial knee joint friction wear testing machine |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110024752A (en) * | 2019-05-22 | 2019-07-19 | 吉林大学 | A kind of fixture for insect leg joint friction test |
| CN110411881A (en) * | 2019-07-25 | 2019-11-05 | 成都海蓉特种纺织品有限公司 | A kind of novel wear resistant test device |
| CN113252328A (en) * | 2021-05-13 | 2021-08-13 | 重庆理工大学 | Exoskeleton fatigue life testing device |
| CN113397531A (en) * | 2021-06-25 | 2021-09-17 | 北京航空航天大学 | Artificial knee joint durability testing device and method based on robot structure |
| CN113984571A (en) * | 2021-10-27 | 2022-01-28 | 吉林大学 | Oscillating high temperature friction wear test device |
| CN114166677A (en) * | 2021-12-06 | 2022-03-11 | 安徽农业大学 | Two-axis artificial femoral head friction testing machine simulating human body environment |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110024752A (en) * | 2019-05-22 | 2019-07-19 | 吉林大学 | A kind of fixture for insect leg joint friction test |
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| CN113397531B (en) * | 2021-06-25 | 2022-10-21 | 北京航空航天大学 | Device and method for testing durability of artificial knee joint based on robot structure |
| CN113984571A (en) * | 2021-10-27 | 2022-01-28 | 吉林大学 | Oscillating high temperature friction wear test device |
| CN113984571B (en) * | 2021-10-27 | 2023-12-29 | 吉林大学 | Swing type high-temperature friction and wear test device |
| CN114166677A (en) * | 2021-12-06 | 2022-03-11 | 安徽农业大学 | Two-axis artificial femoral head friction testing machine simulating human body environment |
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