CN114112746B

CN114112746B - Hip joint femoral stem fatigue test loading device

Info

Publication number: CN114112746B
Application number: CN202111344025.XA
Authority: CN
Inventors: 余锐; 郭小庆; 焦磊
Original assignee: Suzhou Epin Quality Technology Services Co ltd; Yipin Guiyang Quality Technology Co ltd; Hefei Yipin Pharmaceutical Technology Co ltd
Current assignee: Hefei Yipin Pharmaceutical Technology Co ltd; Suzhou Epin Quality Technology Services Co ltd; Yipin Guiyang Quality Technology Co ltd
Priority date: 2021-11-14
Filing date: 2021-11-14
Publication date: 2022-07-08
Anticipated expiration: 2041-11-14
Also published as: CN114112746A

Abstract

The utility model provides a hip joint femoral stem fatigue test loading device which comprises a base, a lateral deviation block, a pressurizing plate and an embedding cylinder, wherein a placing groove for movably placing the embedding cylinder is formed in the lateral deviation block, a moving plate is movably arranged in the lateral deviation block, the moving plate is fixedly connected with a stabilizing plate movably extending into the placing groove, the stabilizing plate is in movable contact with the embedding cylinder, the fixing plate is fixedly connected with a sucking disc for sucking the base, an inflating cavity and an air bag which are mutually communicated are arranged in the base, a piston plate is fixedly connected with an impacting block, and a sounding sheet is fixedly arranged in a sounding cavity. In the using process of the femoral stem prosthesis, the embedding cylinder is movably arranged in the placing cavity, so that the lateral stress on the femoral stem prosthesis can be eliminated during pressurization, meanwhile, lateral deviation blocks are adsorbed on the base through the suckers and are more and more tightly adsorbed along with the experiment, and meanwhile, when the femoral stem prosthesis is turned and loosened, an operator can be reminded by sounding.

Description

Hip joint femoral stem fatigue test loading device

Technical Field

The utility model relates to the technical field of medical fatigue tests, in particular to a hip joint femoral stem fatigue test loading device.

Background

Fatigue performance is a key indicator of the reliability of surgical implants such as artificial joints. Aiming at the problem of testing the fatigue performance of the artificial hip joint, a special artificial joint fatigue testing device is developed, an in-vitro fatigue test is carried out on an artificial femoral stem product according to the ISO7206 standard on the basis of the device, and deformation measurement and three-dimensional reconstruction are carried out on a sample by a three-coordinate instrument; in addition, finite element calculation is carried out on the artificial femoral stem in the sample, and the simulation result is matched with the deformation obtained by the test; after 500 ten thousand cycles of cyclic fatigue tests, the device runs stably without abnormity, reaches the design reliability standard, and can effectively carry out the fatigue standard test and evaluation of the artificial hip joint.

The publication number is CN108007684A, which provides a hip joint femoral stem fatigue test loading device, comprising a base and a loading connecting device, wherein the base comprises a round lower bottom plate, an upper boss is arranged on the circular lower bottom plate in an upward protruding manner, a cylindrical groove is arranged in the middle of the upper boss, a polyacetal isolation pad is fixed in the groove, a plurality of steel ball mounting slotted holes are uniformly formed on the polyacetal isolation pad, each steel ball mounting groove hole is provided with a rotary hard steel ball, the loading connecting device comprises a circular upper bottom plate, a lower boss is arranged on the round upper bottom plate in a downward protruding way, the bottom surface of the lower boss is supported on the hard steel balls, a threaded rod for connecting a fatigue tester is fixed in the middle of the top surface of the circular upper bottom plate, and a connecting spring is respectively connected between a connecting hole on each circular upper bottom plate and a connecting hole on the corresponding circular lower bottom plate.

However, the above device still has the following problems in the implementation process:

1. the steel balls are arranged between the two layers of the pressurizing plates on the pressurizing device, so that the side stress on the femoral stem prosthesis in the experiment can be offset to a certain extent, but the device for offsetting the side stress cannot well solve the problem of the side stress generated in the experiment;

2. in the prior art, femoral stem prostheses are fixed in an embedding cylinder through bone cement, fatigue tests on femoral stems are repeated for many times, millions of pressurization tests are even required to be carried out on the femoral stem prostheses in the actual operation process, and if the femoral stem prostheses deviate in the test process, the femoral stem prostheses can be damaged and even fail in the whole test.

Disclosure of Invention

The utility model aims to provide a hip joint femoral stem fatigue test loading device to solve the problems in the background technology.

In order to achieve the purpose, the utility model provides the following technical scheme:

a hip joint femoral stem fatigue test loading device comprises a base, a lateral deviation block, a pressurizing plate and an embedding cylinder for fixing a femoral stem prosthesis, wherein the lateral deviation block is fixedly connected with a plurality of fixing plates, the lateral deviation block is movably connected with the base through the fixing plates, and a placing groove for movably placing the embedding cylinder is formed in the lateral deviation block;

a lateral deviation cavity is formed in the inner part of the lateral deviation block, a movable plate is movably arranged in the lateral deviation cavity, the movable plate and the inner wall of the lateral deviation cavity are fixedly connected with a first spring, the movable plate is fixedly connected with a stabilizing plate movably extending into the placing groove, and the stabilizing plate is movably contacted with the embedding cylinder;

the lateral deviation block is fixedly connected with a sucker for sucking the base, a pressure cavity is formed in the lateral deviation block, a pressure plate is movably arranged in the pressure cavity, a second spring is fixedly connected to the inner wall of the pressure plate and the inner wall of the pressure cavity, a pull rope is fixedly connected between the pressure plate and the movable plate, the pressure cavity is communicated with the inside of the sucker through a first air passage, a first one-way valve is arranged in the first air passage, an air outlet passage communicated with the pressure cavity is formed in the lateral deviation block, an air blocking cavity is formed in the lateral deviation block, and an air blocking component for movably blocking the air outlet passage is arranged in the air blocking cavity;

a fixed cavity for fixing the embedding cylinder is formed in the lateral deviation block, a magnetic block is movably arranged in the fixed cavity, a third spring is fixedly connected to the inner wall of the magnetic block and the inner wall of the fixed cavity, a fixed rod movably extending into the placing groove is fixedly connected to the magnetic block, and a clamping hole is formed in the rod body of the fixed rod;

the base is internally and respectively provided with an inflating cavity, an air bag cavity and a sounding cavity, the inflating cavity is communicated with an air bag arranged in the air bag cavity through a guide pipe, a second one-way valve is arranged in the guide pipe, a channel second air passage is communicated between the air bag and the sounding cavity, a valve cavity is arranged in the base, a valve component for controlling the second air passage is arranged in the valve cavity, an inflating magnetic plate magnetically connected with a magnetic block is movably arranged in the inflating cavity, a fourth spring is fixedly connected with the inflating magnetic plate and the inner wall of the inflating cavity, a piston plate is movably arranged in the sounding cavity, a first elastic block is fixedly connected with the inner wall of the piston plate and the inner wall of the sounding cavity, an impacting block is fixedly connected with the piston plate, a sounding sheet movably contacted with the impacting block is fixedly arranged in the sounding cavity, and a sound is generated when the impacting block and the sounding sheet impact;

preferably, the fixed plate has inside the installation cavity of having seted up, the inside activity of running through of installation cavity is provided with the kelly, the bayonet socket has been seted up on the kelly pole body, and kelly and installation cavity inner wall fixedly connected with second elastic block, kelly fixedly connected with block rubber, the inside slot of having seted up of block rubber, the inside chamber of running through of seting up of kelly, run through intracavity portion and be provided with the ejector pin that the activity stretched into the slot, and the ejector pin with run through cavity inner wall fixedly connected with elastic rope, the inside auto-lock subassembly that is used for pinning kelly and block rubber that is provided with of base.

Preferably, the auto-lock subassembly includes that a plurality of setings up on the base and supply kelly and the male draw-in groove of rubber block activity, the inserted bar chamber has been seted up to base inside, inserted bar intracavity portion be provided with the activity stretch into the slot and with the inserted bar of ejector pin movable contact, inserted bar and inserted bar intracavity wall fixedly connected with third elastic block, inside first atmospheric pressure chamber and the second atmospheric pressure chamber of seting up mutual intercommunication of base, first atmospheric pressure intracavity portion be provided with the activity stretch into the draw-in groove and with the trigger bar of rubber block movable contact, and trigger bar and the inside fixedly connected with fourth elastic block of first atmospheric pressure intracavity portion, second atmospheric pressure intracavity portion is provided with the activity and inserts the inside locking lever of bayonet socket, and locking lever and the inside fifth elastic block of second atmospheric pressure intracavity wall fixedly connected with.

Preferably, the bottom of the embedding cylinder is provided with a fixing groove for the fixing rod to movably extend into, the inside of the embedding cylinder is provided with a buckle cavity, and the inside of the buckle cavity is provided with a buckle assembly for clamping the fixing rod.

Preferably, buckle subassembly is including the fixed electro-magnet that sets up in buckle intracavity portion, buckle intracavity portion is provided with the activity and stretches into the inside magnetic card pole in card hole, fixedly connected with sixth elastic block between magnetic card pole and the electro-magnet, the electro-magnet is by the on-off control who sets up at embedding section of thick bamboo lateral wall, the fixed slot is inside to be provided with the power supply subassembly for the electro-magnet power supply.

Preferably, the power supply assembly comprises a storage battery fixedly arranged inside a fixing groove, an elastic sheet movably contacted with the fixing rod is arranged inside the fixing groove, the elastic sheet is electrically connected with the electromagnet, and the elastic sheet and the storage battery are matched to control the electromagnet.

Preferably, the air blocking component comprises an air blocking plate movably arranged in the air blocking cavity, the air blocking plate and an air blocking cavity inner wall are fixedly connected with a seventh elastic block, the air blocking plate blocks an air outlet channel when external force is applied, and a traction rope is fixedly connected between the air blocking plate and the air pressing plate.

Preferably, the valve component comprises a valve plate movably arranged in the valve cavity, the valve plate and the inner wall of the valve cavity are fixedly connected with eighth elastic blocks, a ventilation port is formed in the valve plate, one end of the valve plate movably extends into the inflation cavity, and the valve plate blocks the second air passage when not subjected to external force and the ventilation port is located outside the second air passage.

Compared with the prior art, the utility model has the beneficial effects that:

1. the embedding cylinder is placed in the placing groove of the lateral deviation block, the stabilizing plate and the outer wall of the embedding cylinder are in a fit state at the moment, in the experiment process, when the pressurizing plate pressurizes the femoral stem prosthesis, the embedding cylinder can extrude the stabilizing plate to drive the moving plate to extrude the first spring, and the lateral stress direction of the embedding cylinder box deviates at a certain distance at the moment, so that the lateral stress generated in the experiment is offset;

2. in the process of offsetting the lateral stress, the movable plate can continuously move towards the lateral stress direction under the driving of the embedding through cylinder and then reset under the action of the first spring, in the process, the movable plate pulls and pulls the air pressure plate through the pull rope, and meanwhile, the air pressure plate is matched with the air blocking assembly to continuously discharge air in the sucker in the process of offsetting the lateral stress, so that the lateral deviation block and the base are fixed more and more tightly in the experiment process, and the problem that the device is loosened after multiple times of pressurization in the experiment is solved;

3. when the embedding cylinder is placed in the placing groove, the fixing rod extends into the fixing groove, the subsequent stability of the embedding cylinder is guaranteed, the elastic sheet is extruded to be in contact with the storage battery in the process that the fixing rod extends, the electromagnet is powered on and has magnetism, the magnetic card rod is driven to extend into the clamping hole in the rod body of the fixing rod, and therefore the fixing rod can better fix the embedding cylinder;

4. in the process of offsetting the lateral stress, the embedding cylinder continuously drives the fixed rod to drive the magnetic block to continuously move towards the lateral stress direction and then reset, the magnetic block drives the inflatable magnetic plate to continuously move and reset under the action of magnetism, the air bag is continuously inflated, at the moment, if the femoral stem is loosened in the embedding cylinder and the direction is reversed, the direction of the lateral stress is changed, in the process of applying pressure again by the subsequent pressure plate, the embedding cylinder drives the magnetic block to move towards the opposite direction through the fixed rod to trigger the valve component, at the moment, high-pressure gas in the air bag enters the generating cavity, the piston plate is driven to drive the impact block to impact the sound generating sheet and generate sound to remind an operator, the structural design of the air bag firstly utilizes the constant air bag to generate sound in the process of offsetting the lateral stress in the experiment, so that the subsequent gas released into the cavity is in a high-pressure state, the piston plate can be driven more quickly, so that the impact force of the impact block and the impact sheet is greater, a greater sound is produced, and a warning effect is better played;

5. an operator enables the clamping rod to drive the rubber block to extend into the clamping groove by pressing the clamping rod on the fixing plate, in the process, the inserting rod extends into a slot formed in the rubber block, the rubber block is extruded and expanded, and accordingly the rubber block is clamped in the clamping groove, the fixing effect is achieved, compared with the screw fixing of the existing device, the fixing device is more convenient, in the process that the rubber block is extruded and expanded, the rubber block extrudes the gas in the first air pressure cavity into the second air pressure cavity through the trigger rod, the locking rod is driven to extend into the bayonet, the clamping rod is clamped, a self-locking device is formed in the structure, and the device is more stable in the using process;

6. under the effect of auto-lock subassembly for kelly and block rubber and draw-in groove block live, the ejector pin that sets up in the kelly inside this moment is ejecting by the inserted bar, when the experiment completion user need be with fixed plate and base separation, the user only need press the ejector pin hard, ejecting in the inside slot of inserted bar from the block rubber, the block rubber recovers this moment, the auto-lock subassembly has lost the triggering of block rubber this moment, also begins to reset, no longer pins the kelly.

During the use process of the utility model, an operator firstly fixes the femoral stem prosthesis in an embedding cylinder through bone cement, after the fixation is finished, the embedding cylinder is placed in a placing groove according to the required direction, the stabilizing plates on two sides are in contact with the embedding cylinder in a fitting manner, meanwhile, a fixed rod extends into the fixed groove at the bottom of the embedding cylinder, an extrusion elastic sheet is in contact with a storage battery, an electromagnet drives a magnetic card rod to extend into a clamping hole on the fixed rod, meanwhile, the operator aligns the clamping rod in the fixed plate with the clamping groove, presses the clamping rod, the clamping rod drives a rubber block to extend into the clamping groove, under the cooperation of a self-locking assembly, the clamping rod and the clamping groove are locked, so that the fixed plate and a lateral deviation block are kept fixed in the experimental process, the sucking disc is in contact with a base at the moment, a closed space is formed in the sucking disc, at the moment, a pressurizing device is opened, and when the pressurizing plate pressurizes the femoral stem prosthesis, the embedding cylinder can move towards the lateral stress direction, so that the extrusion stabilizing plate drives the movable plate to move and reset towards the lateral stress direction, in the process, the movable plate pulls the air pressure plate to do the same motion through the pull rope, the air in the sucker is continuously exhausted under the matching of the air blocking assembly, the situation that the lateral deviation block and the base are fixed more and more tightly along with the progress of an experiment is realized, meanwhile, in the moving process of the embedding cylinder, the lateral stress direction of the fixing rod box is driven to move and reset, so that the magnetic block is driven to do the same motion, under the magnetic action, the magnetic block drives the inflatable magnetic plate to move to inflate the air bag, along with the progress of the experiment, if the femoral stem prosthesis is turned and loosened in the embedding cylinder, the pressure plate presses the femoral stem prosthesis at the moment, the lateral stress direction at the moment is changed, the magnetic block drives the inflatable magnetic plate to move to trigger the valve assembly, the air in the air bag is released into the sounding cavity, the piston plate is driven to drive the impact block to impact the sounding sheet, and the sound is given out to remind an operator.

Drawings

FIG. 1 is a perspective view of the overall structure of the present invention;

FIG. 2 is an enlarged view of the structure of area A in FIG. 1 according to the present invention;

FIG. 3 is a schematic perspective view of a lateral deviation block according to the present invention;

FIG. 4 is a schematic perspective view of a base according to the present invention;

FIG. 5 is a schematic view of the internal structure of the base of the present invention;

FIG. 6 is a schematic view of the internal structure of the lateral deviation block of the present invention;

FIG. 7 is a schematic view of the embedding cartridge of the present invention being placed in a placement tray;

FIG. 8 is a schematic view of the internal structure of the fixing plate according to the present invention;

FIG. 9 is a schematic view of the internal structure of the clamping rod of the present invention;

fig. 10 is a schematic view of the internal structure of the embedding cylinder of the present invention.

In the figure: 1 base, 2 lateral deviation block, 3 pressure plate, 4 femoral stem prosthesis, 5 embedding cylinder, 6 fixing plate, 7 placing groove, 8 lateral deviation cavity, 9 moving plate, 10 first spring, 11 stabilizing plate, 12 sucker, 13 pneumatic cavity, 14 pneumatic plate, 15 second spring, 16 pull rope, 17 first air passage, 18 first one-way valve, 19 air outlet passage, 20 air blocking cavity, 21 fixed cavity, 22 magnetic block, 23 third spring, 24 fixing rod, 25 clamping hole, 26 inflation cavity, 27 air bag cavity, 28 sounding cavity, 29 air bag, 30 conduit, 31 second one-way valve, 32 second air passage, 33 valve cavity, 34 inflation magnetic plate, 35 fourth spring, 36 piston plate, 37 first elastic block, 38 impact block, 39 sounding sheet, 40 mounting cavity, 41 clamping rod, 42 bayonet, 43 second elastic block, 44 rubber block, 45, 46 penetrating cavity, slot 47, ejector rod, 48 elastic rope, 49, 50 insertion rod cavity, 51 insertion rod, 52 a third elastic block, 53 a first air pressure cavity, 54 a second air pressure cavity, 55 a trigger rod, 56 a fourth elastic block, 57 a lock rod, 58 a fifth elastic block, 59 fixing grooves, 60 buckling cavities, 61 electromagnets, 62 magnetic buckling rods, 63 a sixth elastic block, 64 switches, 65 storage batteries, 66 elastic sheets, 67 air blocking plates, 68 a seventh elastic block, 69 traction ropes, 70 valve plates, 71 an eighth elastic block and 72 a ventilation port.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-10, the present invention provides a technical solution:

the first embodiment is as follows:

considering the particularity of the shape of the femoral stem, a certain lateral stress can be generated in the femoral stem in the experimental process, the loading device for the hip joint femoral stem fatigue test comprises a base 1, a lateral deviation block 2, a pressure plate 3 and an embedding cylinder 5 for fixing a femoral stem prosthesis 4, wherein the base 1 is fixedly arranged and cannot move in the experimental process, the pressure plate 3 is fixedly arranged on the pressure device, the femoral stem prosthesis 4 is fixed in the embedding cylinder 5 through bone cement, the lateral deviation block 2 is fixedly connected with a plurality of fixing plates 6, the fixing plates 6 are four and are respectively and symmetrically arranged at two sides of the lateral deviation block 2, the lateral deviation block 2 is movably connected with the base 1 through the fixing plates 6, the fixing plates 6 are fixed on the base 1 in the experimental process, so that the fixation of the lateral deviation block 2 is realized, a placing groove 7 for movably placing the embedding cylinder 5 is formed in the lateral deviation block 2, the size of the placing groove 7 is larger than that of the embedding cylinder 5, and when the embedding cylinder 5 is placed in the placing groove 7, the embedding cylinder 5 can move;

example two:

in the embodiment, when the femoral stem prosthesis 4 is under pressure, the embedding cylinder 5 drives the femoral stem prosthesis 4 to move towards the direction of lateral stress, so that an effect of eliminating the lateral stress inside the femoral stem prosthesis 4 is achieved, the lateral deviation block 2 is internally provided with the lateral deviation cavity 8, the number of the lateral deviation cavities in the embodiment is two, the lateral deviation cavities are respectively arranged on the left side and the right side of the placing groove 7, the moving plate 9 is movably arranged inside the lateral deviation cavity 8, the inner walls of the moving plate 9 and the lateral deviation cavity 8 are fixedly connected with the first spring 10, the moving plate 9 is fixedly connected with the stabilizing plate 11 movably extending into the placing groove 7, the stabilizing plate 11 is in movable contact with the embedding cylinder 5, when the embedding cylinder 5 is placed inside the placing groove 7, the stabilizing plate 11 is attached to the outer wall of the embedding cylinder 5, and the contact surface of the stabilizing plate 11 and the embedding cylinder 5 is arc-shaped;

example three:

in the existing device, the base 1 and the lateral deviation block 2 are fixed by screws, but the number of times of pressurization in the experiment is very large, and the phenomenon of deviation of the device often occurs along with the progress of the experiment, in the embodiment, on the basis of fixing by the fixing plate 6, the sucking disc 12 is arranged, the sucking disc 12 is more and more tightly adsorbed on the base 1 along with the progress of the experiment by utilizing the movement of the embedding cylinder 5 in the process of eliminating lateral stress, the lateral deviation block 2 is fixedly connected with the sucking disc 12 for sucking the base 1, when the fixing of the fixing plate 6 and the base 1 is completed, a closed space is formed between the sucking disc 12 and the base 1, in the embodiment, two lateral deviation cavities 8 are arranged, the sucking disc 12 and the subsequent air blocking component are only arranged on one side and matched with the structure in the lateral deviation cavity 8, only the moving plate 9 and the corresponding stabilizing plate 11 are arranged in the lateral deviation cavity 8 on the other side, the lateral deviation block 2 is internally provided with a pneumatic cavity 13, the pneumatic cavity 13 is internally movably provided with a pneumatic plate 14, the pneumatic plate 14 and the inner wall of the pneumatic cavity 13 form a closed space, when the air outlet channel 19 is closed, the pneumatic plate 14 moves rightwards, the air in the sucker 12 is sucked out through the first air channel 17, so that the sucker 12 and the base 1 are sucked more tightly, the inner walls of the pneumatic plate 14 and the pneumatic cavity 13 are fixedly connected with the second spring 15, the pull rope 16 is fixedly connected between the pneumatic plate 14 and the moving plate 9, the pneumatic cavity 13 and the sucker 12 are communicated through the first air channel 17, the first air channel 17 is internally provided with a first one-way valve 18, the first one-way valve 18 is arranged to ensure that the air can only enter the pneumatic cavity 13 from the inside of the sucker 12, the lateral deviation block 2 is internally provided with an air outlet channel 19 communicated with the pneumatic cavity 13, the lateral deviation block 2 is internally provided with an air blocking cavity 20, and the air blocking cavity 20 is internally provided with an air blocking component for movably blocking the air outlet channel 19, the gas blocking assembly ensures that the gas outlet channel 19 is in a closed state when the gas pressure plate 14 moves rightwards to suck out gas in the suction cup 12, and simultaneously, the gas outlet channel 19 is in an open state when the gas pressure plate 14 resets to discharge the gas in the gas pressure cavity 13;

example four:

considering that the embedding cylinder 5 is movably placed inside the placing groove 7, in order to further stabilize the embedding cylinder 5, in this embodiment, the fixing rod 24 is provided, the fixing rod 24 is inserted into the fixing groove 59 at the bottom of the embedding cylinder 5, so that the embedding cylinder 5 can be stably offset in the experiment process, the fixing cavity 21 for fixing the embedding cylinder 5 is provided inside the lateral bias block 2, the magnetic block 22 is movably provided inside the fixing cavity 21, the third spring 23 is fixedly connected to the inner wall of the magnetic block 22 and the inner wall of the fixing cavity 21, the fixing rod 24 movably extends into the placing groove 7 is fixedly connected to the magnetic block 22, the fixing rod 24 can move left and right along with the embedding cylinder 5, and the rod body of the fixing rod 24 is provided with the clamping hole 25;

example five:

considering that in the prior art, the femoral stem prosthesis 4 is fixed inside the embedding cylinder 5 through bone cement, if the femoral stem prosthesis 4 is turned and loosened in the experiment process, the experiment cannot be normally performed at this time, the experiment should be stopped, the femoral stem prosthesis 4 is newly fixed and then the experiment is performed, in this embodiment, the embedding cylinder 5 is used to eliminate the side stress and drive the fixing rod 24 to move so as to drive the magnetic block 22 to move, the magnetic block 22 drives the inflating magnetic plate 34 to move under the action of the magnetic force, the gas inside the inflating cavity 26 is extruded into the air bag 29 in the movement process of the inflating magnetic plate 34, so that the gas inside the air bag 29 forms a high-pressure state, when the femoral stem prosthesis 4 is turned and loosened, the side stress direction is changed so that the inflating magnetic plate 34 triggers the valve assembly to release the high-pressure gas inside the air bag 29 into the sounding cavity 28, the driving piston plate 36 drives the impact block 38 to impact the sound generating sheet 39 to generate sound so as to remind an operator, the base 1 is respectively provided with the inflation cavity 26, the air bag cavity 27 and the sound generating cavity 28, the inflation cavity 26 is communicated with the air bag 29 arranged in the air bag cavity 27 through the conduit 30, the conduit 30 is internally provided with the second one-way valve 31, the second one-way valve 31 ensures that gas can only enter the air bag 29 from the inflation cavity 26, meanwhile, the inflation cavity 26 is communicated with the outside through a smaller channel, so that enough gas is filled into the air bag 29 in the inflation cavity 26, the small channel cannot influence the inflation effect, the channel between the air bag 29 and the sound generating cavity 28 is communicated with the second air channel 32, the base 1 is internally provided with the valve cavity 33, the valve component for controlling the second air channel 32 is arranged in the valve cavity 33, the inflation cavity 26 is movably provided with the inflation magnetic plate 34 magnetically connected with the magnetic block 22, the magnetic force between the inflatable magnetic plate 34 and the magnetic block 22 is attractive force, meanwhile, a closed space is formed by the inflatable magnetic plate 34 and the inner wall of the inflatable cavity 26, a fourth spring 35 is fixedly connected to the inner walls of the inflatable magnetic plate 34 and the inflatable cavity 26, a piston plate 36 is movably arranged in the sounding cavity 28, the piston plate 36 and the inner wall of the sounding cavity 28 form a closed space, when the gas in the airbag 29 enters the sounding cavity 28, the piston plate 36 is driven to drive the impact block 38 to impact the sounding sheet 39 to generate sound, the piston plate 36 and the inner wall of the sounding cavity 28 are fixedly connected with a first elastic block 37, the piston plate 36 is fixedly connected with the impact block 38, the sounding sheet 39 which is movably contacted with the impact block 38 is fixedly arranged in the sounding cavity 28, and the impact block 38 and the sounding sheet 39 generate sound when impacting;

example six:

considering that the screw fixing manner in the prior art is rather complicated and troublesome and the loosening condition is easily generated to influence the normal operation of the experiment, the fixing plate 6 is internally provided with the mounting cavity 40, the mounting cavity 40 is internally and movably provided with the clamping rod 41 in a penetrating way, two ends of the clamping rod 41 respectively extend out of the mounting cavity 40, the clamping rod 41 is provided with the bayonet 42 on the rod body, and the inner walls of the clamping rod 41 and the mounting cavity 40 are fixedly connected with a second elastic block 43, the clamping rod 41 is fixedly connected with a rubber block 44, the rubber block 44 has certain elasticity, the rubber block 44 is internally provided with an inserting groove 45, the clamping rod 41 is internally provided with a through cavity 46, the through cavity 46 vertically penetrates through the clamping rod 41, and is communicated with the slot 45 in the rubber block 44, a mandril 47 movably extending into the slot 45 is arranged in the penetrating cavity 46, and the ejector rod 47 and the inner wall of the through cavity 46 are fixedly connected with an elastic rope 48, and a self-locking component for locking the clamping rod 41 and the rubber block 44 is arranged in the base 1.

Example seven:

on the basis of the sixth embodiment, the self-locking assembly structure in the sixth embodiment is disclosed, the self-locking assembly includes a plurality of slots 49 which are provided on the base 1 and into which the clamping rods 41 and the rubber blocks 44 are movably inserted, in the process of fixing the fixing plate 6, the clamping rods 41 and the rubber blocks 44 are both inserted into the slots 49, the slots 49 are slots with small openings and large interiors, the base 1 is provided with an inserting rod cavity 50, the inserting rod cavity 50 is internally provided with an inserting rod 51 which movably extends into the slot 45 and is in movable contact with the ejector rod 47, in the process of driving the rubber blocks 44 to be inserted into the slots 49 by the clamping rods 41, the inserting rod 51 is inserted into the slot 45 in the rubber blocks 44 and extrudes the rubber blocks 44, the slot 45 and the inserting rod 51 in the rubber blocks 44 are both conical, the inner walls of the inserting rod 51 and the inserting rod cavity 50 are fixedly connected with a third elastic block 52, the base 1 is internally provided with a first air pressure cavity 53 and a second air pressure cavity 54 which are mutually communicated, the inside trigger bar 55 that is provided with the activity and stretches into draw-in groove 49 and with the movable contact of block rubber 44 that first atmospheric pressure chamber 53 is inside, trigger bar 55 and the inside airtight space that forms of first atmospheric pressure chamber 53, extrude the inside gas in first atmospheric pressure chamber 53 to inside second atmospheric pressure chamber 54 when trigger bar 55 moves, and the inside fixedly connected with fourth elastic block 56 in trigger bar 55 and first atmospheric pressure chamber 53, the inside locking lever 57 that inserts the bayonet 42 that moves is provided with of second atmospheric pressure chamber 54, locking lever 57 and the inside airtight space that forms of second atmospheric pressure chamber 54, when trigger bar 55 extrudes the inside gas in first atmospheric pressure chamber 53 to inside second atmospheric pressure chamber 54, drive locking lever 57 stretches out and blocks kelly 41, and locking lever 57 and the inner wall fixedly connected with fifth elastic block 58 in second atmospheric pressure chamber 54.

Example eight:

on the basis of the fourth embodiment, considering that there may be the phenomenon that drops in the experiment if only fixing embedding section of thick bamboo 5 through dead lever 24, fixed slot 59 that supplies dead lever 24 activity to stretch into is seted up to embedding section of thick bamboo 5 bottom, when embedding section of thick bamboo 5 was put into standing groove 7 inside, dead lever 24 stretched into inside fixed slot 59, embedding section of thick bamboo 5 was inside to be seted up buckle chamber 60, buckle chamber 60 inside is provided with the buckle subassembly that is used for blocking dead lever 24, through buckle subassembly, make when dead lever 24 stretched into inside fixed slot 59, fix embedding section of thick bamboo 5 and dead lever 24 together more stable.

Example nine:

on the basis of the eighth embodiment, the structure of the buckle assembly in the eighth embodiment is disclosed, the buckle assembly comprises an electromagnet 61 fixedly arranged in a buckle cavity 60, a magnetic card rod 62 movably extending into the buckle hole 25 is arranged in the buckle cavity 60, a sixth elastic block 63 is fixedly connected between the magnetic card rod 62 and the electromagnet 61, the electromagnet 61 is controlled by a switch 64 arranged on the side wall of the embedding cylinder 5, a power supply assembly for supplying power to the electromagnet 61 is arranged in a fixing groove 59, when the power supply assembly starts to supply power to the electromagnet 61, the electromagnet 61 is electrified to magnetically drive the magnetic card rod 62 to extend out to clamp the fixing rod 24, when the embedding cylinder 5 needs to be taken down subsequently, the switch 64 is used for closing the power supply of the electromagnet 61, and the embedding cylinder 5 can be taken down at the moment;

on the basis of the ninth embodiment, the power supply assembly structure in the ninth embodiment is disclosed, the power supply assembly comprises a storage battery 65 fixedly arranged inside the fixing groove 59, an elastic sheet 66 movably contacted with the fixing rod 24 is arranged inside the fixing groove 59, the elastic sheet 66 is electrically connected with the electromagnet 61, the elastic sheet 66 is matched with the storage battery 65 to control the electromagnet 61, the elastic sheet 66 is electrically connected with the electromagnet 61 through a lead, the elastic sheet 66 is separated from the storage battery 65 when not subjected to external force, and the electromagnet 61 is electrified and has magnetism when the elastic sheet 66 is contacted with the storage battery 65;

on the basis of the third embodiment, the structure of the gas baffle assembly in the third embodiment is disclosed, the gas baffle assembly comprises a gas baffle plate 67 movably arranged in a gas baffle cavity 20, the gas baffle plate 67 and the inner wall of the gas baffle cavity 20 are fixedly connected with a seventh elastic block 68, the seventh elastic block 68 provides conditions for resetting of a subsequent structure, the gas baffle plate 67 blocks the gas outlet channel 19 when being subjected to external force, a traction rope 69 is fixedly connected between the gas baffle plate 67 and the gas pressure plate 14, the gas baffle plate 67 does not block the gas outlet channel 19 in an initial state, when the gas pressure plate 14 moves rightwards to suck gas in the suction cup 12, the gas baffle plate 67 is in a state of blocking the gas outlet channel 19, and when the gas pressure plate 14 resets to discharge gas in the gas pressure cavity 13, the gas baffle plate 67 is in a state of withdrawing the gas outlet channel 19;

on the basis of the fifth embodiment, the structure of the valve assembly in the fifth embodiment is disclosed, the valve assembly includes a valve plate 70 movably disposed in the valve cavity 33, the valve plate 70 and the inner wall of the valve cavity 33 are fixedly connected with an eighth elastic block 71, and the valve plate 70 is provided with a ventilation port 72, one end of the valve plate 70 movably extends into the inflation cavity 26, the valve plate 70 blocks the second air passage 32 when not subjected to external force, the ventilation port 72 is positioned outside the second air passage 32, the valve plate 70 can penetrate through the second air passage 32, the valve plate 70 blocks the second air passage 32 in an initial state, the ventilation port 72 is positioned outside the second air passage 32, and one end of the valve plate 70 extends into the inflation cavity 26, is movably contacted with the inflation magnetic plate 34, when the inflation magnetic plate 34 and the valve plate 70 are in pressing contact, the valve plate 70 starts to move, and the ventilation port 72 enters the inside of the second air passage 32, and the second air passage 32 is in an open state.

The working principle is as follows: an operator fixes the femoral stem prosthesis 4 in the embedding cylinder 5 through bone cement, and after the fixation is finished, the embedding cylinder 5 is placed in the placing groove 7;

in the process that the embedding cylinder 5 is placed in the placing groove 7, the fixing rod 24 extends into the fixing groove 59, the extrusion elastic sheet 66 is in contact with the storage battery 65, the electromagnet 61 is electrified to have magnetism, and the magnetic card rod 62 is driven to extend into the clamping hole 25, so that the fixing rod 24 can better fix the embedding cylinder 5 in the subsequent experiment process;

meanwhile, an operator aligns a clamping rod 41 arranged in the fixing plate 6 with a clamping groove 49 on the base 1, presses the clamping rod 41, the clamping rod 41 drives a rubber block 44 to extend into the clamping groove 49, an inserting rod 51 extends into a slot 45 formed in the rubber block 44 at the moment, the rubber block 44 is extruded and expanded, the expanded rubber block 44 is clamped in the clamping groove 49 at the moment, the expanded rubber block 44 extrudes a trigger rod 55 at the same time, gas in a first air pressure cavity 53 is extruded into a second air pressure cavity 54, a driving lock rod 57 extends into a bayonet 42 on the clamping rod 41, the rubber block 44 and the clamping groove 49 form more stable self-locking, and an ejector rod 47 arranged in the clamping rod 41 is ejected under the action of the inserting rod 51 at the moment;

at the moment, an operator opens the pressurizing device, when the pressurizing plate 3 is in extrusion contact with the femoral stem prosthesis 4, the direction of lateral stress of the embedding cylinder 5 moves, so that lateral stress on the femoral stem prosthesis 4 is eliminated, the embedding cylinder 5 moves, meanwhile, the stabilizing plate 11 is extruded to drive the moving plate 9 to move, when the moving plate 9 moves towards the direction of lateral stress, the air pressure plate 14 is pulled to move through the pull rope, the air pressure plate 14 pulls the air baffle plate 67 through the pull rope 69 to enable the air baffle plate 67 to block the air outlet channel 19, at the moment, the air pressure plate 14 sucks gas in the suction cup 12 into the air pressure cavity 13 during movement, when the moving plate 9 resets, the air pressure plate 14 resets at the same time, at the moment, the air baffle plate 67 resets and no longer blocks the air outlet channel 19, the air pressure plate 14 resets and simultaneously exhausts the gas through the air outlet channel 19, the above processes are continuously repeated in the experiment process, so that the gas in the suction cup 12 is continuously reduced, so that the lateral deviation block 2 and the base 1 are adsorbed more and more tightly along with the experiment;

meanwhile, in the experiment process, the embedding cylinder 5 drives the magnetic block 22 to continuously move and reset through the fixing rod 24, the magnetic block 22 drives the inflatable magnetic plate 34 to continuously move and reset under the action of magnetic force, the inflatable magnetic plate 34 continuously extrudes the gas in the inflatable cavity 26 into the air bag 29, at the moment, the gas in the air bag 29 is in a high-pressure state, when the femoral stem prosthesis 4 is turned and loosened in the embedding cylinder 5 in the experiment process, the pressure is exerted again, the direction of the lateral stress applied to the device is changed, the moving direction of the embedding cylinder 5 is changed, the direction of the movement of the fixing rod 24 driving the magnetic block 22 is changed, the moving direction of the inflatable magnetic plate 34 is changed, the valve plate 70 is extruded, so that the vent 72 on the valve plate 70 enters the second air passage 32, at the moment, the gas in the air bag 29 enters the sounding cavity 28, the piston plate 36 is driven to drive the impact block 38 to quickly impact the sounding sheet 39 to make a sound, reminding an operator;

when follow-up operating personnel need separate kelly 41 and draw-in groove 49, press ejector pin 47 hard, extrude inserted bar 51 slot 45 can, the rubber block 44 has lost the extrusion of inserted bar 51 this moment, recover under self elasticity, the rubber block 44 no longer extrudes trigger lever 55 this moment, trigger lever 55 and locking lever 57 reset this moment, kelly 41 and rubber block 44 just are in the state that does not pin this moment, directly extract can, simple and convenient.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a hip joint femoral stem fatigue test loading device, includes base (1), lateral deviation piece (2), pressure plate (3) and is used for embedding section of thick bamboo (5) of fixed femoral stem prosthesis (4), its characterized in that: the lateral deviation block (2) is fixedly connected with a plurality of fixing plates (6), the lateral deviation block (2) is movably connected with the base (1) through the fixing plates (6), and a placing groove (7) for movably placing the embedding cylinder (5) is formed in the lateral deviation block (2);

a lateral deviation cavity (8) is formed in the lateral deviation block (2), a moving plate (9) is movably arranged in the lateral deviation cavity (8), the inner walls of the moving plate (9) and the lateral deviation cavity (8) are fixedly connected with a first spring (10), the moving plate (9) is fixedly connected with a stabilizing plate (11) which movably extends into the placing groove (7), and the stabilizing plate (11) is movably contacted with the embedding cylinder (5);

the lateral deviation block (2) is fixedly connected with a sucker (12) for sucking the base (1), a pneumatic cavity (13) is arranged inside the lateral deviation block (2), a pneumatic plate (14) is movably arranged in the pneumatic cavity (13), the pneumatic plate (14) and the inner wall of the pneumatic cavity (13) are fixedly connected with a second spring (15), a pull rope (16) is fixedly connected between the pneumatic plate (14) and the moving plate (9), the air pressure cavity (13) is communicated with the inside of the sucker (12) through a first air passage (17), a first one-way valve (18) is arranged in the first air passage (17), an air outlet passage (19) communicated with the air pressure cavity (13) is arranged in the lateral deviation block (2), an air blocking cavity (20) is arranged in the lateral deviation block (2), an air blocking component for movably blocking the air outlet channel (19) is arranged in the air blocking cavity (20);

a fixed cavity (21) for fixing the embedding cylinder (5) is formed in the lateral deviation block (2), a magnetic block (22) is movably arranged in the fixed cavity (21), a third spring (23) is fixedly connected to the inner walls of the magnetic block (22) and the fixed cavity (21), a fixed rod (24) movably extending into the placing groove (7) is fixedly connected to the magnetic block (22), and a clamping hole (25) is formed in the rod body of the fixed rod (24);

the base (1) is internally provided with an inflation cavity (26), an air bag cavity (27) and a sounding cavity (28) respectively, the inflation cavity (26) is communicated with an air bag (29) arranged in the air bag cavity (27) through a conduit (30), a second one-way valve (31) is arranged in the conduit (30), a channel second air passage (32) is communicated between the air bag (29) and the sounding cavity (28), a valve cavity (33) is arranged in the base (1), a valve component for controlling the second air passage (32) is arranged in the valve cavity (33), an inflation magnetic plate (34) magnetically connected with a magnetic block (22) is movably arranged in the inflation cavity (26), a fourth spring (35) is fixedly connected with the inner walls of the inflation magnetic plate (34) and the inflation cavity (26), a piston plate (36) is movably arranged in the sounding cavity (28), and a first elastic block (37) is fixedly connected with the inner walls of the piston plate (36) and the sounding cavity (28), the piston plate (36) is fixedly connected with an impact block (38), a sound generating sheet (39) which is movably contacted with the impact block (38) is fixedly arranged in the sound generating cavity (28), and sound is generated when the impact block (38) and the sound generating sheet (39) impact.

2. The hip stem fatigue test loading device according to claim 1, characterized in that: the utility model discloses a fixing plate, including fixed plate (6), installation cavity (40) inside run through the activity and be provided with kelly (41), bayonet socket (42) have been seted up on the kelly (41) pole body, and kelly (41) and installation cavity (40) inner wall fixedly connected with second elastic block (43), kelly (41) fixedly connected with rubber block (44), slot (45) have been seted up to rubber block (44) inside, cavity (46) are run through to inside seting up of kelly (41), run through inside ejector pin (47) that the activity stretched into slot (45) that is provided with of cavity (46), and ejector pin (47) and run through cavity (46) inner wall fixedly connected with elastic rope (48), base (1) inside is provided with the auto-lock subassembly that is used for pinning kelly (41) and rubber block (44).

3. The hip stem fatigue test loading device according to claim 2, characterized in that: the self-locking assembly comprises a plurality of clamping grooves (49) which are formed in a base (1) and used for clamping rods (41) and rubber blocks (44) to be movably inserted, an inserting rod cavity (50) is formed in the base (1), an inserting rod (51) which movably extends into an inserting groove (45) and movably contacts with an ejector rod (47) is arranged in the inserting rod cavity (50), a third elastic block (52) is fixedly connected to the inner walls of the inserting rod (51) and the inserting rod cavity (50), a first air pressure cavity (53) and a second air pressure cavity (54) which are communicated with each other are formed in the base (1), a trigger rod (55) which movably extends into the clamping groove (49) and movably contacts with the rubber blocks (44) is arranged in the first air pressure cavity (53), a fourth elastic block (56) is fixedly connected to the inner portions of the trigger rod (55) and the first air pressure cavity (53), and a lock rod (57) which is movably inserted into a bayonet (42) is arranged in the second air pressure cavity (54), and the lock rod (57) and the inner wall of the second air pressure cavity (54) are fixedly connected with a fifth elastic block (58).

4. The hip stem fatigue test loading device according to claim 1, characterized in that: the fixing device is characterized in that a fixing groove (59) for the fixing rod (24) to movably extend into is formed in the bottom of the embedding cylinder (5), a buckle cavity (60) is formed in the embedding cylinder (5), and a buckle assembly for clamping the fixing rod (24) is arranged in the buckle cavity (60).

5. The hip stem fatigue test loading device according to claim 4, wherein: the buckle subassembly is including fixed electro-magnet (61) that sets up in buckle chamber (60) inside, buckle chamber (60) inside is provided with the activity and stretches into inside magnetism kelly (62) in calorie hole (25), fixedly connected with sixth elastic block (63) between magnetism kelly (62) and electro-magnet (61), electro-magnet (61) are controlled by switch (64) that set up at embedding section of thick bamboo (5) lateral wall, fixed slot (59) inside is provided with the power supply subassembly that supplies power to electro-magnet (61).

6. The hip stem fatigue test loading device according to claim 5, wherein: the power supply assembly comprises a storage battery (65) fixedly arranged in a fixing groove (59), an elastic sheet (66) movably contacted with the fixing rod (24) is arranged in the fixing groove (59), the elastic sheet (66) is electrically connected with the electromagnet (61), and the elastic sheet (66) is matched with the storage battery (65) to control the electromagnet (61).

7. The hip stem fatigue test loading device according to claim 1, characterized in that: the air blocking component comprises an air blocking plate (67) movably arranged in an air blocking cavity (20), a seventh elastic block (68) is fixedly connected with the inner wall of the air blocking plate (67) and the inner wall of the air blocking cavity (20), the air blocking plate (67) blocks the air outlet channel (19) when external force is applied, and a traction rope (69) is fixedly connected between the air blocking plate (67) and the air pressing plate (14).

8. The hip stem fatigue test loading device of claim 6, wherein: the valve component comprises a valve plate (70) movably arranged in a valve cavity (33), the inner walls of the valve plate (70) and the valve cavity (33) are fixedly connected with eighth elastic blocks (71), a ventilation opening (72) is formed in the valve plate (70), one end of the valve plate (70) movably extends into the inflation cavity (26), and the valve plate (70) blocks the second air passage (32) when external force is not applied and the ventilation opening (72) is located outside the second air passage (32).