A fixture for femoral condyle fatigue testing device

Abstract

The present invention discloses a fixture for a femoral condyle fatigue test device, comprising a horizontal angle adjustment block. The angle between the horizontal angle adjustment block and a fixed frame can be adjusted using a horizontal angle adjustment bolt. The angle between the horizontal angle adjustment block and the vertical angle adjustment block can be adjusted using a vertical angle adjustment bolt. A locking bolt can secure the horizontal and vertical angles of the vertical and horizontal angle adjustment blocks relative to a base of a femoral condyle fatigue tester, as well as their horizontal and vertical positions relative to the base, thereby locking a femoral condyle simulation specimen. This fixture effectively addresses the difficulty in pre-test installation and positioning caused by the irregular shape of the femoral condyle.

Description

Technical Field

[0001] The invention relates to a fixture for a fatigue testing device, in particular to a fixture for a femoral condyle fatigue testing device. Background Art

[0002] The demand for artificial knee prostheses is increasing annually. Mechanical testing of knee prostheses primarily relies on fatigue testing, primarily focusing on the tibial component and femoral condyle. Due to the irregular shape of the femoral condyle, positioning it prior to testing is a technical challenge. Positioning deviations in various directions and angles often lead to inaccurate test results. Currently, no fixtures are known for femoral condyle fatigue testing. Summary of the Invention

[0003] The object of the present invention is to provide a fixture for a femoral condyle fatigue testing device, which helps to achieve accurate positioning of the femoral condyle during fatigue testing.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A fixture for a femoral condyle fatigue test device of the present invention includes a base, which is fixedly connected to a fixed frame by bolts. Two long holes are respectively spaced apart on the base on the front and rear sides of the fixed frame. A vertical deflection angle adjustment block is a T-shaped metal block. The vertical deflection angle adjustment block includes an adjustment block rear rod. The front end of the adjustment block rear rod is connected to the middle of the left wall of the adjustment block front body. A groove is respectively opened downward on the top walls on the front and rear sides of the adjustment block front body. A brass contact pad is embedded in each groove. The top surface of the brass contact pad is an arc shape that matches the shape of the posterior condyle position of the femoral condyle simulation specimen.

[0006] The rear rod of the adjustment block is arranged through the n-shaped slot opened in the middle of the bottom wall of the horizontal deflection adjustment block. The right side of the rear rod of the adjustment block is matched with the n-shaped slot. A first light hole of the side wall is arranged with an axis in the horizontal direction and perpendicular to the axis direction of the rear rod of the adjustment block at the lower part of the horizontal deflection adjustment block. A second light hole of the side wall is arranged coaxially with the first light hole of the side wall on the vertical deflection adjustment block. The rear rod of the adjustment block of the vertical deflection adjustment block is supported on the base and is arranged in a fixed frame together with the horizontal deflection adjustment block. The front body of the adjustment block The horizontal deflection angle adjustment block is arranged in a groove on the right wall of the fixed frame, and the top of the horizontal deflection angle adjustment block is arranged in an opening on the top wall of the fixed frame, and the two are clearance-matched. A light hole with an axis arranged in a horizontal direction is opened on the upper part of the horizontal deflection angle adjustment block, and threaded holes are respectively opened on the left and right side walls of the fixed frame at a coaxial position with the light hole. The horizontal deflection angle adjustment bolt is threadedly connected to the threaded hole of the fixed frame and passes through the light hole on the horizontal deflection angle adjustment block, and is fixedly connected by being screwed into the threaded hole of the fixed frame. The horizontal deflection angle adjustment block is rotationally matched with the horizontal deflection angle adjustment bolt;

[0007] The front and rear side walls of the fixed frame are provided with mounting holes, and the light rod of the vertical deflection angle adjustment bolt passes through the mounting hole on the rear side wall of the fixed frame, the light hole on the rear wall of the n-shaped slot of the horizontal deflection angle adjustment block, the light hole on the vertical deflection angle adjustment block, the light hole on the front wall of the n-shaped slot of the horizontal deflection angle adjustment block and the mounting hole on the front side wall of the fixed frame in the horizontal direction, and the threaded end of the vertical deflection angle adjustment bolt is fixed to the front side wall of the fixed frame by a nut, and the light rod of the vertical deflection angle adjustment bolt and the light hole on the rear wall of the n-shaped slot of the horizontal deflection angle adjustment block, the light hole on the vertical deflection angle adjustment block, the light hole on the horizontal deflection angle adjustment block The light hole on the front wall of the N-shaped slot of the deflection adjustment block is rotated to fit; the fixing bolt passes through the top wall threaded hole on the left side of the top wall of the fixed frame in the vertical direction, and the bottom of the fixing bolt presses the left end of the rear rod of the adjustment block to form a lever with the vertical deflection adjustment bolt as the fulcrum, one end of the force point is the fixing bolt, and the other end is the brass contact pad; by rotating the fixing bolt, the right end of the vertical deflection adjustment block can move up and down in the groove at the right end of the fixed frame, and when the right end of the vertical deflection adjustment block moves upward, the posterior condyle position of the femoral condyle simulation specimen can be clamped between the brass contact pad and the top wall of the groove on the right wall of the fixed frame.

[0008] The beneficial effects of the present invention are:

[0009] 1. Able to realize the vertical and horizontal angle positioning of the femoral condyle;

[0010] 2. Angle adjustment and positioning functions are achieved through bolts, with reliable structure and easy maintenance;

[0011] 3. The brass contact pad can prevent damage to the femoral condyle caused by excessive clamping force. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the fixture of the femoral condyle fatigue test device of the present invention;

[0013] Figure 2 Yes, remove Figure 1 A schematic diagram of the internal structure of the fixed frame of the present invention;

[0014] Figure 3 yes Figure 1 Schematic diagram of the connection structure of the horizontal deflection angle adjustment block and the vertical deflection angle adjustment block in the device shown;

[0015] Figure 4 yes Figure 1 a schematic diagram of the base in the illustrated device;

[0016] Figure 5 yes Figure 1 A schematic front view of the fixed frame in the device shown;

[0017] Figure 6 yes Figure 1 A schematic diagram of the back of the fixed frame in the device shown;

[0018] Figure 7 yes Figure 1 Schematic diagram of the horizontal deflection angle adjustment block in the device shown;

[0019] Figure 8 This is a schematic diagram of the spatial structure of the vertical and horizontal deflection adjustment blocks within the fixed frame.

[0020] Figure 9 yes Figure 1 Schematic diagram of the installation structure of the brass contact pad and vertical deflection adjustment block in the device shown;

[0021] Figure 10 It is a structural diagram when the fixing bolts apply load to the vertical deflection adjustment block and the horizontal deflection adjustment block.

[0022] In the figure, 1 is a base, 2 is a fixed frame, 3 is a vertical angle adjustment bolt, 4 is a horizontal angle adjustment bolt, 5 is a vertical angle adjustment block, 6 is a horizontal angle adjustment block, 7 is a brass contact pad, 8 is a loading rod, 9 is a fixing bolt, and 10 is a femoral condyle simulation specimen. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] As attached Figure 1 The present invention is a fixture for a femoral condyle fatigue test device, comprising a base, wherein the base 1 is fixedly connected to a fixed frame 2 by bolts, and two long holes are spaced apart on the base 1 on the front and rear sides of the fixed frame 2, such as Figure 4 As shown, a bolt passes through the elongated hole and is screwed into the threaded hole on the base of the femoral condyle fatigue testing machine. When loose, the fixture can move left and right along the elongated hole. When tightened, the base 1 fits tightly against the surface of the femoral condyle fatigue testing machine (existing device), and friction secures the fixture to the machine.

[0025] The vertical deflection angle adjustment block 5 is made of a T-shaped metal block. The vertical deflection angle adjustment block 5 includes an adjustment block rear rod. The front end of the adjustment block rear rod is connected to the middle of the left wall of the adjustment block front body. A groove is opened downward on the top walls on the front and back sides of the adjustment block front body, and a brass contact pad 7 is embedded in each groove. The top surface of the brass contact pad 7 is an arc that matches the shape of the posterior condyle position of the femoral condyle simulation specimen 10.

[0026] like Figure 1As shown, the rear rod of the adjustment block is arranged through the n-shaped slot opened in the middle of the bottom wall of the horizontal deflection adjustment block 6, and the right side of the rear rod of the adjustment block is clearance-matched with the n-shaped slot. A first side wall light hole is provided at the lower part of the horizontal deflection adjustment block 6, the axis of which is arranged in the horizontal direction and perpendicular to the axis direction of the rear rod of the adjustment block. A second side wall light hole is provided on the vertical deflection adjustment block 5, which is coaxial with the first side wall light hole. Figure 9 As shown, the rear rod of the vertical deflection adjustment block 5 is supported on the base 1 and is arranged in the fixed frame 2 together with the horizontal deflection adjustment block 6. The front body of the adjustment block is arranged in the groove of the right wall of the fixed frame 2. The top of the horizontal deflection adjustment block 6 is arranged in the opening of the top wall of the fixed frame 2 and the two are clearance-matched. A light hole with an axis arranged in the horizontal direction is opened on the upper part of the horizontal deflection adjustment block 6, and threaded holes for use with the horizontal deflection adjustment bolt 4 are opened on the left and right side walls of the fixed frame 2 at the same axial position as the light hole. The horizontal deflection adjustment bolt 4 is threadedly connected to the threaded hole of the fixed frame 2 and passes through the light hole on the horizontal deflection adjustment block 6, and is fixedly connected by screwing into the threaded hole of the fixed frame 2. As shown Figure 8 When the horizontal angle adjustment bolt 4 is tightened, a gap exists between the horizontal angle adjustment block 6 and the fixed frame 2 , and the horizontal angle adjustment block 6 rotates with the horizontal angle adjustment bolt 4 , and the horizontal angle adjustment block 6 can rotate around the horizontal angle adjustment bolt 4 .

[0027] Mounting holes are formed in the front and rear side walls of the fixed frame 2. The polished rod of the vertical angle adjustment bolt 3 passes horizontally through the mounting hole in the rear side wall of the fixed frame 2, the polished hole in the rear wall of the n-shaped slot of the horizontal angle adjustment block 6, the polished hole in the vertical angle adjustment block 5, the polished hole in the front wall of the n-shaped slot of the horizontal angle adjustment block 6, and the mounting hole in the front wall of the fixed frame 2. The threaded end of the vertical angle adjustment bolt is fixed to the front wall of the fixed frame 2 by a nut. The polished rod of the vertical angle adjustment bolt 3 rotates with the polished hole in the rear wall of the n-shaped slot of the horizontal angle adjustment block 6, the polished hole in the vertical angle adjustment block 5, and the polished hole in the front wall of the n-shaped slot of the horizontal angle adjustment block 6, so that the vertical angle adjustment bolt becomes the central axis of rotation of the vertical angle adjustment block 5. The horizontal angle adjustment block 6 and the vertical angle adjustment block 5 have a clearance fit and are not tightly coupled. After the vertical angle adjustment bolt 3 is tightened, the horizontal angle adjustment block 6 and the vertical angle adjustment block 5 can rotate relative to each other. Moreover, there are gaps between the fixed frame 2 and the vertical deflection adjustment block 5 as well as the horizontal deflection adjustment block 6, so no interference occurs. Figure 8As shown, space is provided for the horizontal angle adjustment block 6 and the vertical angle adjustment block 5 to rotate relative to each other about the vertical angle adjustment bolt 3. The purpose of providing mounting holes in the sidewalls of the fixed frame 2 is to facilitate the installation of the vertical angle adjustment bolt 3. During installation, the vertical angle adjustment bolt is inserted through the mounting holes in the sidewalls, passing through the apertures in the horizontal angle adjustment block 6 and the vertical angle adjustment block 5. The bolt is then tightened to secure it to the sidewalls of the horizontal angle adjustment block 6. The vertical angle adjustment block 5 can then rotate about the vertical angle adjustment bolt 3 using the vertical angle adjustment bolt 3 as its central axis.

[0028] The fixing bolt 9 passes through the threaded hole on the top wall of the left side of the top wall of the fixed frame 2 in the vertical direction, and the bottom of the fixing bolt 9 presses against the left end of the rear rod of the adjustment block to form a lever with the vertical deflection adjustment bolt 3 as the fulcrum. One end of the force application point is the fixing bolt 9, and the other end is the brass contact pad 7. Figure 10 shown.

[0029] The position of the vertical deflection adjustment block 5 in space can be adjusted by screwing in and out the fixing bolt 9. By rotating the fixing bolt 9, the right end of the vertical deflection adjustment block 5 can move up and down in the groove of the right wall of the fixed frame 2. When the right end of the vertical deflection adjustment block 5 moves upward, the posterior condyle position of the femoral condyle simulation specimen 10 can be clamped between the brass contact pad 7 and the top wall of the groove on the right wall of the fixed frame 2. The two brass contact pads 7 contact the posterior condyle position of the femoral condyle simulation specimen 10 (which is the existing structure). When the fixing bolt 9 is tightened, the two brass contact pads 7 will press the femoral condyle simulation specimen 10 upward, and the fixed frame 2 will press the femoral condyle simulation specimen 10 downward, thereby clamping the femoral condyle simulation specimen 10. Then, the bottom of the loading rod 8 of the femoral condyle fatigue testing machine, which is set in the vertical direction, contacts the anterior condyle position of the femoral condyle simulation specimen 10 and applies a load. Since the brass contact pad 7 has good plasticity and is restricted by the shape of the femoral condyle, when tightening the fixing bolt 9, the device can automatically adjust to the appropriate horizontal deviation angle of the femoral condyle sample relative to the fixed frame 2 and the vertical deviation angle of the femoral condyle sample relative to the fixed frame 2, and at the same time lock the horizontal deviation angle and the vertical deviation angle to fix the femoral condyle simulation specimen 10.

[0030] The angular position between the horizontal angle adjustment block 6 and the fixed frame 2 in this device can be adjusted with the horizontal angle adjustment bolt 4 as the center, and the angular position between the vertical angle adjustment block 5 and the horizontal angle adjustment block can be adjusted with the vertical angle adjustment bolt 3 as the center. The locking fixing bolt 9 can fix the horizontal and vertical angles of the vertical angle adjustment block 5 and the horizontal angle adjustment block 6 relative to the base of the femoral condyle fatigue testing machine, as well as the horizontal and vertical positions of the two relative to the base, so as to achieve the purpose of locking the femoral condyle simulation specimen.

[0031] The working process of the present invention comprises the following steps:

[0032] (1) Place the posterior condyle of the femoral condyle simulation specimen 10 on the brass contact pad 7.

[0033] (2) Adjust the posture of the femoral condyle simulation specimen 10 and tighten the fixing bolt 9.

[0034] (3) Slide the base 1 along the two long holes on the base 1, adjust the horizontal position of the base 1, and tighten the bolts on the base to fix the base 1 and the base of the femoral condyle fatigue testing machine so that the overall horizontal position of the femoral condyle fatigue testing device is fixed.

[0035] (4) The loading rod 8 on the femoral condyle fatigue testing machine is lowered until it contacts the anterior condyle of the femoral condyle simulation specimen 10, and the fatigue test is started. The experimental method is shown in ASTM F 3161.

[0036] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A fixture for a femoral condyle fatigue test device, comprising a base, wherein the base (1) is fixedly connected to a fixed frame (2) by bolts, and is characterized in that: Two long holes are respectively spaced apart on the left and right sides of the base on the front and rear sides of the fixed frame. The vertical deflection angle adjustment block (5) is a T-shaped metal block. The vertical deflection angle adjustment block includes an adjustment block rear rod. The front end of the adjustment block rear rod is connected to the middle of the left wall of the adjustment block front body. A groove is respectively opened downward on the top wall on the front and rear sides of the adjustment block front body. A brass contact pad (7) is embedded in each groove. The top surface of the brass contact pad is an arc shape that matches the shape of the posterior condyle position of the femoral condyle simulation specimen (10). The rear rod of the adjustment block is arranged through the n-shaped slot opened in the middle of the bottom wall of the horizontal deflection adjustment block (6), and the right side of the rear rod of the adjustment block is in clearance with the n-shaped slot. A first light hole of the side wall is arranged with an axis in the horizontal direction and perpendicular to the axis direction of the rear rod of the adjustment block at the lower part of the horizontal deflection adjustment block, and a second light hole of the side wall is arranged coaxially with the first light hole of the side wall on the vertical deflection adjustment block. The rear rod of the adjustment block of the vertical deflection adjustment block is supported on the base and is arranged in a fixed frame together with the horizontal deflection adjustment block. The front body of the adjustment block The horizontal deflection angle adjustment block is arranged in a groove on the right wall of the fixed frame, the top of the horizontal deflection angle adjustment block is arranged in an opening on the top wall of the fixed frame and the two are clearance-matched, a light hole is opened on the upper part of the horizontal deflection angle adjustment block, and threaded holes are opened on the left and right side walls of the fixed frame at a position coaxial with the light hole, the horizontal deflection angle adjustment bolt (4) is threadedly connected with the threaded hole of the fixed frame and passes through the light hole on the horizontal deflection angle adjustment block, and is fixedly connected by being screwed into the threaded hole of the fixed frame, and the horizontal deflection angle adjustment block is rotationally matched with the horizontal deflection angle adjustment bolt; The front and rear side walls of the fixed frame are provided with mounting holes, and the light rod of the vertical deflection angle adjustment bolt (3) passes through the mounting hole on the rear side wall of the fixed frame, the light hole on the rear wall of the n-shaped slot of the horizontal deflection angle adjustment block, the light hole on the vertical deflection angle adjustment block, the light hole on the front wall of the n-shaped slot of the horizontal deflection angle adjustment block and the mounting hole on the front side wall of the fixed frame in the horizontal direction, and the threaded end of the vertical deflection angle adjustment bolt is fixed to the front side wall of the fixed frame by a nut, and the light rod of the vertical deflection angle adjustment bolt is connected to the light hole on the rear wall of the n-shaped slot of the horizontal deflection angle adjustment block, the light hole on the vertical deflection angle adjustment block, the light hole on the horizontal deflection angle adjustment block, the light hole on the front wall of the n-shaped slot of the horizontal deflection angle adjustment block, and the mounting hole on the front side wall of the fixed frame. The light hole on the front wall of the n-shaped slot of the deflection adjustment block is rotated and matched; the fixing bolt (9) passes through the top wall threaded hole on the left side of the top wall of the fixed frame in the vertical direction, and the bottom of the fixing bolt presses the left end of the rear rod of the adjustment block to form a lever with the vertical deflection adjustment bolt as the fulcrum, one end of the force application point is the fixing bolt, and the other end is the brass contact pad; by rotating the fixing bolt, the right end of the vertical deflection adjustment block can move up and down in the groove at the right end of the fixed frame, and when the right end of the vertical deflection adjustment block moves upward, the posterior condyle position of the femoral condyle simulation specimen can be clamped and set between the brass contact pad and the top wall of the groove on the right wall of the fixed frame.

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