Impact resistance testing machine for hip joint prosthesis

Abstract

The utility model provides a hip joint prosthesis impact resistance testing machine, which relates to the technical field of impact resistance testing of medical prostheses, and comprises a base, a support frame is fixed on the upper surface of the base, a partition plate is fixed in the middle of the support frame, two sliding rods are fixed between the upper surface of the partition plate and the top end of the support frame, and the two sliding rods are fixed on the base. A hammer body assembly is arranged on the two sliding rods in a sliding mode, a hammer body clamp is installed between the two sliding rods, a secondary impact preventing device corresponding to the hammer body assembly in position is fixed to the upper surface of the partition plate, and a sample clamp capable of adjusting the placing height of a sample is fixed to the upper surface of the base. According to the device, the sample clamp is arranged, in the sample clamp, the lifting table is rotated to drive the supporting column to rotate in the inner threaded sleeve, the height of the sample supporting block can be adjusted, the compatibility of the sample can be improved, the application range of the device is widened, and the femoral head sample can be prevented from being subjected to secondary impact.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of impact resistance testing machines, specifically a kind of hip joint prosthesis impact resistance testing machine, belong to the anti-impact performance testing technical field of medical prosthesis. BACKGROUND

[0002] Hip joint prosthesis is a kind of medical device for replacing damaged or degenerative hip joint, mainly composed of acetabular cup, femoral head and femoral stem, restore the function of joint by surgical implantation in human body, with the rapid development of medical industry, the hip joint prosthesis that can be stably used has become one of the key research directions of major medical research and development units in the world.

[0003] Reliable hip joint prosthesis requires that in the process of various impact behaviors in daily life, no cracks or even damage can occur under certain energy load, at the same time, due to its deep position in human body, problems will be very serious, even life-threatening, so it needs to be tested for performance, hip joint prosthesis impact resistance is determined by fixing femoral head, gradually increasing the weight of hammer body, observing whether cracking or damage occurs, recording data until the sample is destroyed, to evaluate its impact resistance.

[0004] In hip joint, femoral head and femoral neck prosthesis size range is wide, and the size of the clamp required for different size femoral head and femoral neck may need to be customized, and the applicable range is small. In addition, when hammer body hits the test sample through impact block, hammer body may rebound, and after rebound, hammer body is affected by gravity and falls again and hits the test sample, thereby affecting the test result. Therefore, a kind of hip joint prosthesis impact resistance testing machine is proposed. UTILITY MODEL CONTENTS

[0005] The utility model provides a kind of hip joint prosthesis impact resistance testing machine.

[0006] The utility model is realized by the following technical scheme: a kind of hip joint prosthesis impact resistance testing machine, including base, the upper surface of the base is fixed with support frame, the middle part of the support frame is fixed with baffle, two sliding rods are fixed between the upper surface of baffle and the top of support frame, one hammer body assembly is slidably arranged on two sliding rods, hammer clamp is installed between two sliding rods, and hammer clamp is located directly above hammer body assembly.

[0007] The upper surface of the baffle is fixed with anti-secondary impact device corresponding to the position of hammer body assembly, and the upper surface of the base is fixed with sample clamp for adjusting sample placement height.

[0008] The sample clamp comprises a rack fixed on the upper surface of the base, an inner threaded sleeve fixed on the bottom wall of the rack, a support column threadedly sleeved in the inner threaded sleeve, a lifting platform fixed at the top end of the support column, a sensor mounted on the top of the lifting platform, a connecting seat mounted on the top of the sensor, a sample support block mounted on the top of the connecting seat, and an impact head slidingly connected to the top of the rack.

[0009] The bottom end of the hammer body assembly is fixed with an impact rod, the bottom end of the impact rod penetrates through the lower part of the partition plate and contacts the top of the impact head.

[0010] Specifically, the anti-secondary impact device comprises two U-shaped frames and two connecting frames, both of the two U-shaped frames are fixed on the upper surface of the partition plate, and both of the two U-shaped frames are located on the left and right sides of the hammer body assembly, one air cylinder is fixed on the top of each of the two U-shaped frames, and the telescopic ends of the two air cylinders extend into the interiors of the two U-shaped frames, respectively.

[0011] Specifically, the middle parts of the two connecting frames are hingedly connected to the upper surface of the partition plate through a hinge block, one blocking wheel is rotatably connected to each of the ends of the two connecting frames close to each other, both of the blocking wheels are located below the hammer body assembly, and the ends of the two connecting frames away from each other extend into the interiors of the two U-shaped frames and are hingedly connected to the telescopic ends of the two air cylinders, respectively.

[0012] Specifically, the anti-secondary impact device further comprises two sliding groove rods, one fixing frame is mounted on each of the two sliding groove rods, and an optoelectronic sensor corresponding to the position of the hammer body assembly is mounted on each of the two fixing frames.

[0013] The air cylinder and the optoelectronic sensor are electrically connected to the controller.

[0014] The hip joint prosthesis impact resistance testing machine has the following beneficial effects:

[0015] 1. The hip joint prosthesis impact resistance testing machine is provided with a sample clamp, in which the height of the sample support block can be adjusted by rotating the lifting platform to drive the support column to rotate in the inner threaded sleeve, and the height is locked after adjustment. The compatibility of the sample can be improved, and the application range of the device can be improved.

[0016] 2. The hip joint prosthesis impact resistance testing machine, through the setting of the anti secondary impact device, when the hammer body clamp impacts the hammer body assembly, the hammer body assembly rebounds upward under the action of the hard impact force, at this time, the upward displacement signal of the hammer body assembly is detected by the photoelectric sensor and fed back to the controller, and at the same time, the controller controls the cylinder to elongate, so that the one end of the connecting frame located below the hammer body assembly is tilted upward, and the blocking wheel is pressed to the bottom surface of the hammer body assembly, so that the hammer body assembly is prevented from falling again, thereby avoiding the femoral head sample from being impacted twice, and ensuring the accuracy of the impact test data. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a perspective structural schematic view of the utility model;

[0018] Figure 2 It is a front view of the utility model;

[0019] Figure 3 It is a front view of the local structure of the utility model;

[0020] Figure 4 It is a perspective view of the local structure of the utility model;

[0021] Figure 5 It is a perspective structural schematic view of the upper surface of the partition plate in the utility model Figure 1 ;

[0022] Figure 6 It is a perspective structural schematic view of the upper surface of the partition plate in the utility model Figure 2 ;

[0023] Figure 7 It is a perspective structural schematic view of the sample clamp in the utility model.

[0024] BRIEF DESCRIPTION OF DRAWINGS

[0025] 1, base; 2, support frame; 3, partition plate; 4, sliding rod;

[0026] 5, hammer body assembly; 501, impact rod;

[0027] 6, anti secondary impact device; 601, U-shaped frame; 602, connecting frame; 603, blocking wheel; 604, cylinder; 605, sliding slot rod; 606, fixed frame; 607, photoelectric sensor;

[0028] 7, sample clamp; 701, rack; 702, internal thread sleeve; 703, support column; 704, lifting platform; 705, sensor; 706, connecting seat; 707, sample support block; 708, impact head; 709, femoral head sample;

[0029] 8, hammer body clamp. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0031] Referring to Figures 1-7 The hip joint prosthesis impact resistance testing machine provided by the embodiment of the present application comprises a base 1, a support frame 2 is fixed on the upper surface of the base 1, a partition plate 3 is fixed in the middle of the support frame 2, two sliding rods 4 are fixed between the upper surface of the partition plate 3 and the top end of the support frame 2, a hammer body assembly 5 is slidably arranged on the two sliding rods 4, a hammer body clamp 8 is installed between the two sliding rods 4, and the hammer body clamp 8 is located directly above the hammer body assembly 5. When impact testing is performed, the hammer body assembly 5 is clamped to a specified height by the hammer body clamp 8, and then the hammer body assembly 5 is released to perform free-fall movement, so as to impact the sample below.

[0032] The upper surface of the partition plate 3 is fixed with a secondary impact prevention device 6 corresponding to the position of the hammer body assembly 5, and the upper surface of the base 1 is fixed with a sample clamp 7 capable of adjusting the height at which the sample is placed.

[0033] Referring to Figure 7 The sample clamp 7 comprises a rack 701 fixed on the upper surface of the base 1, an inner threaded sleeve 702 fixed on the bottom wall of the rack 701, a support column 703 threadedly sleeved in the inner threaded sleeve 702, a 7031 threadedly sleeved on the outer surface of the support column 703, a lifting platform 704 fixed on the top end of the support column 703, a sensor 705 installed on the top of the lifting platform 704, the sensor 705 being electrically connected with a controller, for detecting an impact force signal and feeding back to the controller. An adapter seat 706 is installed on the top of the sensor 705, a sample support block 707 is installed on the top of the adapter seat 706, the sample support block 707 is used for supporting a femoral head sample 709, and a striking head 708 is slidably connected to the top of the rack 701. When impact testing is performed, the bottom end of the striking head 708 is in contact with the femoral head sample 709.

[0034] The bottom end of the hammer body assembly 5 is fixed with an impact rod 501, the bottom end of the impact rod 501 penetrates to the lower side of the partition plate 3 and is in contact with the top of the striking head 708. When the hammer body clamp 8 impacts the hammer body assembly 5, the impact rod 501 can impact the striking head 708, and then the striking head 708 impacts the femoral head sample 709.

[0035] In the sample clamp 7, the hip joint (femoral head) sample is placed on the sample support block 707, and by rotating the lifting platform 704, the support column 703 is rotated inside the inner threaded sleeve 702, that is, the height of the sample support block 707 can be adjusted to improve the compatibility of the sample and the application range of the device. After the height adjustment is completed, the locking is performed by rotating 7031.

[0036] Please refer to Figures 3-6 , Specifically, the secondary impact prevention device 6 includes two U-shaped frames 601 and two connecting frames 602, both of which are fixed on the upper surface of the partition plate 3, and both of which are located on the left and right sides of the hammer assembly 5. The top of the two U-shaped frames 601 is fixed with a gas cylinder 604, and the extension end of the two gas cylinders 604 extends into the interior of the two U-shaped frames 601.

[0037] The middle part of the two connecting frames 602 is hinged to the upper surface of the partition plate 3 through a hinge block, and the end of the two connecting frames 602 close to each other is rotatably connected with a blocking wheel 603, both of which are located below the hammer assembly 5. The end of the two connecting frames 602 away from each other extends into the interior of the two U-shaped frames 601 and is hingedly connected with the extension end of the two gas cylinders 604. Among them, the hinge end of the connecting frame 602 and the U-shaped frame 601 is provided with a strip-shaped sliding hole (as shown in Figure 6 ).

[0038] The secondary impact prevention device 6 also includes two sliding groove rods 605, both of which are installed with a fixed frame 606, and both of which are installed with a photoelectric sensor 607 corresponding to the position of the hammer assembly 5.

[0039] The above-mentioned gas cylinder 604 and photoelectric sensor 607 are electrically connected with the controller.

[0040] In the secondary impact prevention device 6, when the hammer clamp 8 impacts the hammer assembly 5, the hammer assembly 5 will rebound upward under the action of the hard impact force, at which time the upward displacement signal of the hammer assembly 5 is detected by the photoelectric sensor 607 and fed back to the controller. At the same time, the controller controls the extension of the gas cylinder 604, so that the end of the connecting frame 602 below the hammer assembly 5 is raised upward, and the blocking wheel 603 is pressed against the bottom surface of the hammer assembly 5, so as to avoid the hammer assembly 5 from falling again, thereby avoiding the femoral head sample 709 from being impacted twice, and ensuring the accuracy of the impact test data.

[0041] The working principle has been shown in the above.

[0042] The basic principle and main features of the present application and the advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A hip joint prosthesis impact resistance testing machine comprising a base (1), characterised in that: The upper surface of the base (1) is fixed with a support frame (2), the middle part of the support frame (2) is fixed with a partition plate (3), the upper surface of the partition plate (3) and the top end of the support frame (2) are fixed with two slide rods (4), and a hammer body assembly (5) is slidably arranged on the two slide rods (4); The upper surface of the partition plate (3) is fixed with a secondary impact prevention device (6) corresponding to the position of the hammer body assembly (5), and the upper surface of the base (1) is fixed with a sample clamp (7) capable of adjusting the height of the sample placement. The sample clamp (7) comprises a rack (701) fixed on the upper surface of the base (1), an inner threaded sleeve (702) fixed on the bottom wall of the rack (701), a support column (703) threadedly sleeved in the inner threaded sleeve (702), a threaded sleeve (7031) threadedly sleeved on the outer surface of the support column (703), a lifting platform (704) fixed on the top end of the support column (703), a sensor (705) mounted on the top of the lifting platform (704), a connecting seat (706) mounted on the top of the sensor (705), a sample support block (707) mounted on the top of the connecting seat (706), and a striking head (708) slidably connected to the top of the rack (701). The bottom end of the hammer body assembly (5) is fixed with an impact rod (501), and the bottom end of the impact rod (501) penetrates downward to the lower side of the partition plate (3) and is in contact with the top of the striking head (708).

2. A hip prosthesis impact resistance testing machine according to claim 1, characterized in that: The secondary impact prevention device (6) comprises two U-shaped frames (601) and two connecting frames (602), the two U-shaped frames (601) are fixed on the upper surface of the partition plate (3), and the two U-shaped frames (601) are respectively located on the left and right sides of the hammer body assembly (5), one air cylinder (604) is fixed on the top of each of the two U-shaped frames (601), and the telescopic ends of the two air cylinders (604) respectively extend into the interiors of the two U-shaped frames (601).

3. A hip prosthesis impact resistance testing machine according to claim 2, wherein: The middle parts of the two connecting frames (602) are hingedly connected to the upper surface of the partition plate (3), one stop wheel (603) is rotatably connected to each end of the two connecting frames (602) away from each other, the two stop wheels (603) are located below the hammer body assembly (5), and the other ends of the two connecting frames (602) away from each other respectively extend into the interiors of the two U-shaped frames (601) and are hingedly connected with the telescopic ends of the two air cylinders (604).

4. The hip prosthesis impact resistance testing machine of claim 2, wherein: The secondary impact prevention device (6) further comprises two chute rods (605), one fixing frame (606) is mounted on each of the two chute rods (605), and an optical sensor (607) corresponding to the position of the hammer body assembly (5) is mounted on each of the two fixing frames (606).

5. The hip prosthesis impact resistance testing machine of claim 1, wherein: A hammer clamp (8) is mounted between the two slide rods (4), and the hammer clamp (8) is located directly above the hammer body assembly (5).

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