A femoral implant biomechanical testing assembly method

Abstract

The application provides a femur implant biomechanics test assembly method, and belongs to the technical field of bone implant tests, and comprises the following steps: fixing a sawbone bone by using a fixing mechanism, establishing a coordinate and adjusting the position of the sawbone bone according to the coordinate, simulating implantation of a bone plate and a screw by using software, drilling a hole according to a simulation result, fixing the bone plate and the screw, cutting a fracture line on the sawbone bone by using a cutting mechanism, and embedding and treating the sawbone bone by using a dental base powder after implantation of the bone implant is completed, so that an embedding tool is connected to both ends of the sawbone bone, and the assembly is completed. The application calibrates the position of a three-dimensional model and a real object by using a coordinate point, and reversely pushes the screw and the bone plate to an assembly position by using the three-dimensional model, so that the difference between a real assembly structure and a three-dimensional model assembly structure can be greatly reduced, errors caused by manual assembly can be avoided, and the rigor of biomechanics tests can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bone implant testing, in particular to a femoral implant biomechanics testing assembly method. BACKGROUND

[0002] The common method for studying femoral implant biomechanics in vitro is to implant the implant on a sawbone. Since there is no reference in the assembly process of the implant and the sawbone, there is a large error in each assembly sample, which causes the biomechanics test results to also have unavoidable errors, affecting the judgment of the performance of the implant by doctors and researchers. Therefore, the present application provides a femoral implant biomechanics testing assembly method. SUMMARY

[0003] The purpose of the present application is to provide a femoral implant biomechanics testing assembly method.

[0004] To solve the above technical problems, the purpose of the present application is achieved as follows:

[0005] A femoral implant biomechanics testing assembly method, comprising the following steps:

[0006] S1: fixing the sawbone with a fixing mechanism;

[0007] S2: pasting D scanning points on the femoral head vertex, greater trochanter vertex and condyle bone fossa midpoint of the sawbone, and making an actual coordinate system of the sawbone through 3D scanning, and comparing the actual coordinate system with the three-dimensional model coordinate system of the sawbone in the three-dimensional software, and if there is a deviation, adjusting the position of the sawbone through the fixing mechanism until the actual coordinate system coincides with the three-dimensional model coordinate system;

[0008] S3: assembling the bone plate three-dimensional model and the bone plate fixed screw three-dimensional model to the sawbone three-dimensional model in the three-dimensional software, and extracting the axis of the assembled screw three-dimensional model;

[0009] S4: drilling the sawbone according to the axis in step S3;

[0010] S5: fixing the bone plate and the bone plate fixed screw to the sawbone according to the drilled hole in step S4;

[0011] S6: cutting the fracture line on the sawbone with a cutting mechanism;

[0012] S7: fixing the remaining bone plate or the remaining screw on the sawbone according to the drilled hole in step S4;

[0013] S8: After the implantation of the bone implant is completed, the fixing mechanism drives the sawbone bone to move, so that the inclination angle of the femoral force line in the coronal plane and the sagittal plane meets the test requirements, and the dental powder is embedded for treatment, so that the embedding tool is connected to both ends of the sawbone bone;

[0014] The fixing mechanism comprises a fixing ring and a connecting seat; the fixing ring is connected to the connecting seat through a connecting rod and is internally provided with an inflatable clamping mechanism; the fixing ring can rotate in the axial direction thereof and can rotate in the axial direction of the connecting rod; the fixing ring and the connecting seat can move left and right;

[0015] The drilling mechanism comprises a first arc-shaped sliding rail and a second arc-shaped sliding rail; the second arc-shaped sliding rail is slidingly arranged on the inner side of the first arc-shaped sliding rail, and a telescopic rod is slidingly arranged on the inner side of the second arc-shaped sliding rail; a drill bit is detachably connected to the end of the telescopic rod.

[0016] As a preferred scheme of the above scheme, the fixing ring is sleeved at the middle position of the sawbone bone when the fixing ring fixes the sawbone bone.

[0017] As a preferred scheme of the above scheme, the remaining bone plate in step S7 comprises a secondary bone plate fixed on the opposite side of the bone plate; and the remaining screw comprises a secondary bone plate fixing screw and a cancellous bone screw.

[0018] As a preferred scheme of the above scheme, the end of the telescopic rod is provided with a mounting seat capable of being actively rotated; a mounting groove is formed in the center of the mounting seat; a slot penetrating through the mounting seat is arranged on the two sides of the mounting groove, and a magnetic attraction part is arranged at the bottom of the mounting groove; a mounting head adapted to the mounting groove is arranged at the end of the drill bit; a limiting block adapted to the slot is arranged on the two sides of the mounting head, and a magnetic attraction part is arranged at the end of the mounting head.

[0019] As a preferred scheme of the above scheme, the cutting mechanism comprises two sliding rods; a base is slidingly arranged on the sliding rod; a sliding groove is formed in the base; a cutter and a cam are arranged in the sliding groove; the cutter has a rectangular structure, a cutting sawtooth is arranged at the first end, and the second end is slidingly connected in the sliding groove; the number of the cams is two, which are arranged on the upper and lower sides of the cutter and abut against the edges of the cutter, so as to drive the cutter to slide up and down in the sliding groove.

[0020] The beneficial effects of the present application are as follows:

[0021] 1. The sawbone bone is fixed through the assembly system, the position of the real sawbone bone is introduced into the three-dimensional software through 3D scanning, the position difference between the real object and the model is obtained through comparison with the three-dimensional model coordinates of the sawbone bone in the three-dimensional software, and the real sawbone bone is driven to move to the same position as the three-dimensional model of the sawbone bone through the fixing mechanism of the assembly system, so as to ensure the accuracy of subsequent processing and assembly.

[0022] 2. The axis of each screw is obtained through the three-dimensional model of the bone plate and the bone plate fixing screw in the three-dimensional software, the drilling mechanism of the assembly system is controlled to drill holes on the real sawbone bone according to the axis of each screw, so as to ensure that the real object and the three-dimensional model structure are the same, and the precision of the test is maintained. At the same time, the screw installation position is obtained through three-dimensional reverse calculation, which can avoid the cross interference of each screw when manually installed.

[0023] 3. The application realizes the calibration of the position of the real object and the three-dimensional model through the coordinate points, and the screw and the bone plate assembly position are obtained through the three-dimensional model reverse calculation, which can greatly reduce the difference between the real assembly structure and the three-dimensional model assembly structure, avoid the error caused by manual assembly, and improve the rigor of biomechanical test. DETAILED DESCRIPTION

[0024] Figure 1 It is a schematic diagram of the fixing mechanism and the sawbone bone of the application.

[0025] Figure 2 It is a schematic diagram of the sawbone bone and each mechanism structure of the application.

[0026] Figure 3 It is a schematic diagram of the drilling mechanism structure of the application.

[0027] Figure 4 It is a schematic diagram of the cutting mechanism structure of the application.

[0028] Figure 5 It is an exploded schematic diagram of the cutting mechanism of the application.

[0029] Figure 6 It is a schematic diagram of the drill bit and the mounting seat structure of the application.

[0030] Figure 7 It is a schematic diagram of the embedding tool structure of the application.

[0031] Figure 8 It is a schematic diagram of the assembly completion of the application.

[0032] In the figure: 1. sawbone; 2. bone plate; 3. bone plate fixing screw; 4. embedding tool; 11. fixing ring; 12. connecting seat; 13. connecting rod; 21. first arc-shaped slide rail; 22. second arc-shaped slide rail; 23. telescopic rod; 24. drill bit; 25. mounting head; 26. mounting seat; 31. sliding rod; 32. base; 33. cutter; 34. cam. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0034] A femoral implant biomechanical testing and assembly method comprises the following steps:

[0035] S1: Fixing the sawbone 1 with a fixing mechanism to adjust the position of the sawbone 1 and process it. Figure 1 and Figure 2 As shown, the fixing mechanism includes a fixing ring 11 and a connecting seat 12. The fixing ring 11 is connected to the connecting seat 12 through a connecting rod 13. An inflatable clamping mechanism is provided inside. The inflatable clamping mechanism expands after being inflated to clamp the sawbone 1. Since the inflatable clamping mechanism is relatively soft in texture, it does not damage the sawbone 1. At the same time, the inflation volume of the inflatable clamping mechanism is adjustable, and the clamping degree can be changed. The fixing ring 11 can rotate along its axial direction, and can drive the sawbone 1 to rotate along its axis to adjust its position. At the same time, the fixing ring 11 can rotate axially along the connecting rod 13, and can change the inclination angle of the sawbone 1. In addition, the fixing ring 11 and the connecting seat 12 can move left and right to adjust the water level position of the sawbone 1.

[0036] S2: Attach 3D scanning points to the apex of the femoral head, the apex of the greater trochanter, and the midpoint of the condylar fossa of the sawbone 1. Import the position information of the actual sawbone 1 into the software through 3D scanning, make the actual coordinate system of the sawbone, and compare the actual coordinate system with the coordinate system of the sawbone 3D model in the 3D software. If there is any deviation, adjust the position of the sawbone 1 through the fixing mechanism until the actual coordinate system coincides with the 3D model coordinate system to ensure that the position arrangement of the actual sawbone 1 and the sawbone 3D model are the same.

[0037] S3: Assemble the three-dimensional model of the bone plate and the three-dimensional model of the bone plate fixing screws onto the three-dimensional model of the sawbone in the three-dimensional software, and extract the axis of the assembled three-dimensional model of the screws to determine the implantation position of each screw in the real object.

[0038] S4: According to the screw axis extracted in step S3, drive the drilling mechanism to drill holes on the sawbone, and obtain a plurality of screw implantation holes. As shown in Figure 3 , the drilling mechanism includes a first arc-shaped sliding rail 21 and a second arc-shaped sliding rail 22. The first arc-shaped sliding rail 21 is fixed in position, and the second arc-shaped sliding rail 22 is slidably arranged on the inner side of the first arc-shaped sliding rail 21. An extension rod 23 is slidably arranged on the inner side of the second arc-shaped sliding rail 22, and a drill bit 24 is detachably connected to the end of the extension rod 23. The first arc-shaped sliding rail 21, the second arc-shaped sliding rail 22 and the extension rod 23 can drive the drill bit 24 to move around the sawbone 1, thereby drilling holes in the sawbone 1 from different angles.

[0039] As shown in Figure 6 , the end of the extension rod 23 is provided with a mounting seat 26 that can be actively rotated. The mounting seat 26 is provided with a mounting groove in the center, and the two sides of the mounting groove are provided with slots that penetrate the mounting seat 26. The bottom of the mounting groove is provided with a magnetic attraction part. The end of the drill bit 24 is provided with a mounting head 25 that is matched with the mounting groove. The two sides of the mounting head 25 are provided with limiting blocks that are matched with the slots, and the end of the mounting head 25 is provided with a magnetic attraction part. The drill bit 24 is positioned by the cooperation of the mounting head 25 and the mounting groove, and is magnetically detachably connected by the interaction of the two magnetic attraction parts, so as to replace the drill bit 24 and meet the drilling requirements of different screws.

[0040] S5: Corresponding to the screw implantation holes drilled in step S4, the bone plate 2 and the bone plate fixation screw 3 are fixed to the sawbone 1. The bone plate 2 is provided with through holes through which the screws pass. Corresponding to each screw implantation hole, each bone plate fixation screw 3 is screwed into the screw implantation hole, thereby assembling the bone plate 2.

[0041] S6: Use the cutting mechanism to cut a fracture line on the sawbone 1. As shown in Figure 4 and Figure 5As shown, the cutting mechanism includes two fixed sliding rods 31, and a base 32 is slidably arranged on the sliding rods 31, and the base 32 is slidably driven by a driving mechanism. The base 32 is provided with a sliding groove, and a cutter 33 and a cam 34 are arranged in the sliding groove. The cutter 33 is in a rectangular structure, and a cutting sawtooth is arranged at a first end, and a second end is slidably connected in the sliding groove. The two cams 34 are arranged on the upper and lower sides of the cutter 33, and abut the edges of the cutter 33, and can drive the cutter 33 to slide up and down in the sliding groove. The two cams 34 abut the two sides of the cutter 33 with the opposite convex sides and the opposite non-convex sides, respectively, and can drive the cutter 33 to move up and down reciprocally, so that the cutting sawtooth at the end of the cutter 33 acts on the sawbone 1 to realize cutting. Before cutting, the three-dimensional model of the sawbone 1 is cut to form a bone fracture simulation in the three-dimensional software, and then the position information of the three-dimensional model cutting is fed back to the control mechanism, and the control mechanism controls the cutting mechanism to cut the real object of the sawbone 1, so as to ensure that the real object and the three-dimensional model have the same structure.

[0042] S7: The remaining bone plate or the remaining screw is fixed on the sawbone 1 corresponding to the drilled hole in step S4. The biomechanical test includes femur tests of different assembly structures, such as single bone plate type femur test, single bone plate plus cancellous bone screw femur test, and double bone plate femur test. Among them, the remaining bone plate includes the auxiliary bone plate fixed on the opposite side of the bone plate 2 in the double bone plate femur test; and the remaining screw includes the auxiliary bone plate fixing screw and the cancellous bone screw in the single bone plate plus cancellous bone screw femur test.

[0043] S8: After the bone implant is implanted, the fixing mechanism drives the sawbone 1 to move, so that the inclination angle of the femur force line in the coronal plane and the sagittal plane meets the test requirements, and the sawbone 1 is treated with a dental powder embedding process, so that the embedding tool 4 is connected to the two ends of the sawbone 1, and the assembly is completed, as shown in Figure 7 and Figure 8 After the assembly is completed, the assembled structure can be connected to the test device to implement the biomechanical test.

[0044] The preferred embodiments of the application are described in detail above. It should be understood that those skilled in the art can make many modifications and changes without creative labor based on the concept of the present application. Therefore, any technical solutions obtained by logical analysis, reasoning or limited experiments based on the prior art according to the concept of the present application shall be within the protection scope defined by the claims.

Claims

1. A femoral implant biomechanical testing and assembly method, characterized in that: The following steps are involved: S1: fix the sawbone using a fixation mechanism (1); S2: Attach 3D scanning points to the apex of the femoral head, the apex of the greater trochanter, and the midpoint of the condylar fossa of the sawbone (1), and make the actual coordinate system of the sawbone (1) through 3D scanning. Compare the actual coordinate system with the coordinate system of the three-dimensional model of the sawbone (1) in the three-dimensional software. If there is a deviation, adjust the position of the sawbone (1) through the fixing mechanism until the actual coordinate system coincides with the coordinate system of the three-dimensional model. S3: assembling the three-dimensional model of the bone plate and the three-dimensional model of the bone plate fixing screw onto the three-dimensional model of the sawbone (1) in the three-dimensional software, and extracting the axis of the assembled three-dimensional model of the screw; S4: driving the drilling mechanism to drill the sawbone (1) according to the axis in step S3; S5: Fixing the bone plate (2) and the bone plate fixing screws (3) to the sawbone (1) through the holes drilled in step S4; S6: using the cutting mechanism to cut a fracture line on the sawbone bone (1); before cutting, the three-dimensional model of the sawbone bone (1) is cut in the three-dimensional software to form a fracture simulation, and then the position information of the cut of the three-dimensional model is fed back to the control mechanism, and the control mechanism controls the cutting mechanism to cut the sawbone bone (1) to ensure that the structure of the real object is the same as that of the three-dimensional model; S7: Fix the remaining bone plates or screws to the sawbone (1) through the holes drilled in step S4; S8: After the bone implant is implanted, the fixing mechanism drives the sawbone (1) to move so that the inclination angles of the femoral force line in the coronal and sagittal planes meet the test requirements, and the implant is embedded with dental tray powder so that the embedding tool (4) is connected to both ends of the sawbone (1); The fixing mechanism comprises a fixing ring (11) and a connecting seat (12); the fixing ring (11) is connected to the connecting seat (12) via a connecting rod (13), and an inflatable clamping mechanism is provided inside the fixing ring (11); the fixing ring (11) can rotate along its axial direction and, at the same time, can rotate along the axial direction of the connecting rod (13); the fixing ring (11) and the connecting seat (12) can move left and right; The drilling mechanism comprises a first arc-shaped slide rail (21) and a second arc-shaped slide rail (22); the second arc-shaped slide rail (22) is slidably arranged on the inner side surface of the first arc-shaped slide rail (21), and a telescopic rod (23) is slidably arranged on the inner side surface; the end of the telescopic rod (23) is detachably connected to a drill bit (24).

2. A femoral implant biomechanical testing and assembly method according to claim 1, characterized in that: The fixing ring (11) is sleeved on the middle position of the sawbone (1) when fixing the sawbone (1).

3. A femoral implant biomechanical testing and assembly method according to claim 1, characterized in that: The remaining bone plates in step S7 include auxiliary bone plates fixed to the opposite side of the bone plate (2); and the remaining screws include the auxiliary bone plate fixing screws and cancellous bone screws.

4. A femoral implant biomechanical testing and assembly method according to claim 1, characterized in that: The end of the telescopic rod (23) is provided with an actively rotatable mounting seat (26); a mounting groove is provided at the center of the mounting seat (26); slots penetrating the mounting seat (26) are provided on both sides of the mounting groove, and a magnetic attraction portion is provided at the bottom of the mounting groove; a mounting head (25) adapted to the mounting groove is provided at the end of the drill bit (24); limit blocks adapted to the slot are provided on both sides of the mounting head (25), and a magnetic attraction portion is provided at the end of the mounting head (25).

5. A femoral implant biomechanical testing and assembly method according to claim 1, characterized in that: The cutting mechanism comprises two sliding rods (31); a base (32) is slidably provided on the sliding rod (31); a slide groove is provided in the base (32); a cutter (33) and a cam (34) are provided in the slide groove; the cutter (33) is in a rectangular structure, a first end of which is provided with cutting teeth, and a second end of which is slidably connected in the slide groove; the number of the cams (34) is two, which are respectively provided on the upper and lower sides of the cutter (33) and abut against the edge of the cutter (33) to drive the cutter (33) to slide up and down in the slide groove.

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