Patella internal fixation testing device

Abstract

The utility model relates to a patella internal fixation testing device which comprises a sample seat and a testing machine, the sample seat is provided with a seat body, a supporting frame, an outer fixing cylinder and an inner fixing cylinder, the outer fixing cylinder is fixedly connected to the seat body, and the supporting frame is arranged on the seat body; the inner fixing cylinder is detachably mounted in the outer fixing cylinder; the testing machine is provided with a power output end and is configured to provide a power source in a testing process; wherein the to-be-tested skeleton model is provided with a skeleton main body, a tendon and a patella which is internally fixed; one end, far away from the patella, of the skeleton main body is fixedly mounted in the inner fixing cylinder, and a bone cement filling space is formed between the inner wall of the inner fixing cylinder and the end, far away from the patella, of the skeleton main body; the tendon is connected with the power output end through a connecting piece. According to the invention, the stability effect detection after patella internal fixation is realized.

Description

Technical Field

[0001] The present application belongs to the field of medical device testing technology, and specifically relates to a patellar internal fixation testing device. Background Art

[0002] Currently, most fixation devices used for knee joint mechanical testing use mechanical clamps or support frame structures. These devices usually rely on simple mechanical clamps to fix the knee joint. For example, a fixed sleeve is used to directly fix the bone model to be tested in the fixed sleeve with bolts. During the fixation process, the position and pressure of the clamp are manually adjusted to achieve fixation. However, this simple fixation method has an unstable fixation effect. The bone model may become loose during the test, thereby affecting the accuracy of the test results.

[0003] Some laboratories and research institutions also use standardized mechanical testing platforms, which generally include a set of complex mechanical structures and sensors to measure the response of the knee joint under different mechanical conditions. Although these mechanical testing platforms can provide accurate data, the equipment is expensive, the operation is complicated, and it is not easy to promote and apply them widely.

[0004] In some resource-limited environments, researchers use simple homemade fixation devices, which are usually temporarily assembled according to experimental needs. Although low-cost, they are time-consuming and labor-intensive, and the fixation effect on bone models is unstable, and measurement accuracy and reliability are difficult to guarantee.

[0005] Based on the above analysis, there is no existing test device with a simple structure, easy operation, and low cost to detect the stability of the patella after internal fixation. Therefore, there is an urgent need to provide a patella internal fixation test device. Utility Model Content

[0006] In view of the above analysis, the embodiments of the present invention aim to provide a patellar internal fixation testing device to solve one or more of the above problems existing in the prior art.

[0007] The purpose of this utility model is achieved in this way:

[0008] A patellar internal fixation testing device comprises a sample holder and a testing machine;

[0009] The sample holder comprises a holder body, a support frame, an outer fixing cylinder and an inner fixing cylinder. The outer fixing cylinder is fixedly connected to the holder body, and the support frame is arranged on the holder body. The inner fixing cylinder can be detachably installed in the outer fixing cylinder.

[0010] The testing machine has a power output terminal configured to provide a power source during the testing process;

[0011] Among them, the bone model to be tested has a bone body, tendons and a patella with internal fixation; the end of the bone body away from the patella is fixedly installed in the internal fixation tube, and a bone cement-filled space is formed between the tendon and the inner wall of the internal fixation tube; the tendon is connected to the power output end through a connector.

[0012] Furthermore, the inner fixing tube can be detachably installed in the outer fixing tube.

[0013] Furthermore, the outer fixing tube and the inner fixing tube are fixed by a tightening bolt.

[0014] Furthermore, a bolt hole is provided on the wall of the outer fixing tube, and a tightening groove is provided on the outer surface of the wall of the inner fixing tube; when the inner fixing tube is installed in the outer fixing tube, the bolt hole is aligned with the tightening groove, and after the tightening bolt is screwed into the bolt hole, the top end of the tightening bolt can abut against the tightening groove to achieve the fixation of the inner fixing tube and the outer fixing tube.

[0015] Furthermore, the connecting member is a rope, a fixed pulley is provided on the support frame, the rope passes around the fixed pulley, a first end of the rope is connected to the power output end, and a second end of the rope is connected to the tendon near the patella.

[0016] Furthermore, the second end of the rope is clamped and fixed to the tendon by a clamping block assembly, and the clamping block assembly includes a first clamping block and a second clamping block. The first clamping block and the second clamping block are provided with tooth structures on two opposite surfaces, and the first clamping block and the second clamping block are fixedly connected by bolts.

[0017] Furthermore, the sample holder also has a fixing rod, and the bone body is also provided with a medullary cavity, and the fixing rod is inserted into the medullary cavity to achieve auxiliary fixation of the bone model.

[0018] Furthermore, a first center hole is provided at the bottom of the external fixation tube, and a second center hole is provided at the bottom of the internal fixation tube. The first center hole can be communicated with the internal cavity of the seat body, and the fixing rod can pass through the first center hole and the second center hole in sequence from the internal cavity of the seat body and be inserted into the medullary cavity of the bone body.

[0019] Furthermore, the sample holder can be detachably mounted on the support frame, and the height and front-back position of the sample holder can be adjusted.

[0020] Furthermore, the base body has an internal cavity, and a plurality of first adjustment holes connected to the internal cavity are provided on two opposite sides of the base body; a plurality of second adjustment holes distributed longitudinally are provided on the support frame; by aligning the first adjustment holes and the second adjustment holes at different positions, the height and front and rear position adjustment of the sample holder can be achieved using fixing bolts.

[0021] Compared with the existing technology, the patellar internal fixation testing device provided by the utility model has a simple structure, easy operation and low cost. By detecting the stability effect after patellar internal fixation, it can realize the comparison of patellar internal fixation effects of various patellar internal fixation devices such as patellar nails and patellar internal fixators, and then realize the stability comparison of different patellar internal fixation device products, which is conducive to the selection of appropriate patellar fixation devices in actual clinical practice and has positive significance for improving the effect of patellar internal fixation surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this specification. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0023] Figure 1 This is a schematic structural diagram of the patellar internal fixation testing device provided by the present invention;

[0024] Figure 2 This is a disassembly diagram of the patellar internal fixation testing device provided by the present invention;

[0025] Figure 3 A schematic cross-sectional view of the patellar internal fixation testing device provided by the present invention;

[0026] Figure 4 A schematic cross-sectional view of a sample holder of the patellar internal fixation testing device provided by the present invention;

[0027] Figure 5 Schematic diagram of the disassembly of the sample holder of the patellar internal fixation test device provided by the utility model Figure 1 ;

[0028] Figure 6 Schematic diagram of the disassembly of the sample holder of the patellar internal fixation test device provided by the utility model Figure 2 ;

[0029] Figure 7 This is a structural schematic diagram of the clamping block assembly of the patellar internal fixation testing device provided by the present invention.

[0030] Reference numerals:

[0031] 1 - sample holder; 11 - holder body; 111 - internal cavity; 112 - first adjustment hole; 12 - support frame; 121 - second adjustment hole; 122 - fixing bolt; 13 - external fixing cylinder; 131 - bolt hole; 132 - first center hole; 14 - internal fixing cylinder; 141 - tightening groove; 142 - second center hole; 15 - tightening bolt; 16 - fixing rod;

[0032] 2-Bone model to be tested;

[0033] 3-Rope;

[0034] 4-fixed pulley;

[0035] 5-clamping block assembly; 51-first clamping block; 52-second clamping block;

[0036] 6- Main axis. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined, separated, interchanged and / or rearranged with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0038] In the accompanying drawings, the sizes and relative sizes of components may be exaggerated for clarity and / or descriptive purposes. When the exemplary embodiments can be implemented differently, the specific process sequence may be performed in a different order than described. For example, two processes described in succession may be performed substantially simultaneously or in a reverse order from the described order. In addition, the same reference numerals represent the same components.

[0039] The terms used herein are for the purpose of describing specific embodiments and are not intended to be restrictive. As used herein, unless the context clearly indicates otherwise, the singular forms "one (kind, person)" and "said (the)" are also intended to include plural forms. In addition, when the terms "comprise" and / or "include" and their variations are used in this specification, the features, integral bodies, steps, operations, parts, assemblies and / or their groups stated are explained, but the presence or addition of one or more other features, integral bodies, steps, operations, parts, assemblies and / or their groups is not excluded. It should also be noted that, as used herein, the terms "substantially", "approximately" and other similar terms are used as approximate terms and not as degree terms, so that they are used to explain the inherent deviations of the measured values, calculated values and / or the values provided that will be recognized by those of ordinary skill in the art.

[0040] Example 1

[0041] A specific embodiment of the present invention is as follows Figures 1 to 6As shown, a patellar internal fixation testing device is disclosed, including a testing machine and a sample seat 1, on which a bone model 2 to be tested is mounted; the main shaft 6 of the testing machine has a power output end, which is configured to provide a power source during the testing process; the sample seat 1 has a seat body 11, a support frame 12, an external fixation tube 13 and an internal fixation tube 14, the external fixation tube 13 is fixedly connected to the seat body 11, and the support frame 12 is provided on the seat body 11. The position of the seat body 11 is fixed and can be fixed on the experimental platform; the internal fixation tube 14 is detachably mounted in the external fixation tube 13; the bone model 2 to be tested is manufactured based on the human bone structure, and has a bone body, on which a patella and a tendon are provided. The patella is pre-fixed with a patellar nail or other fixing device; one end of the bone body away from the patella is fixedly mounted in the internal fixation tube 14, and a bone cement-filled space is formed between the end of the bone body and the inner wall of the internal fixation tube 14; the tendon is connected to the power output end of the testing machine through a connector.

[0042] In this embodiment, the internal fixing tube 14 can be detachably installed in the external fixing tube 13. Exemplarily, the external fixing tube 13 and the internal fixing tube 14 are fixed by bolts. Specifically, a bolt hole 131 is provided on the wall of the external fixing tube 13, and an annular groove 141 is provided on the outer surface of the wall of the internal fixing tube 14. When the internal fixing tube 14 is installed in the external fixing tube 13, the bolt hole 131 is aligned with the annular groove 141. After the bolt is screwed into the bolt hole 131, the top of the bolt can abut against the annular groove 141, squeezing the outer wall of the internal fixing tube 14, thereby achieving the fixation of the internal fixing tube 14 and the external fixing tube 13. In addition, this structural setting can prevent the internal fixing tube 14 from moving axially during the test, thereby ensuring the fixation stability of the bone model.

[0043] In one optional embodiment, the connecting member is a rope 3, a fixed pulley 4 is provided on the support frame 12, the rope 3 is passed around the fixed pulley 4, the first end of the rope 3 is connected to the power output end of the testing machine, and the second end of the rope 3 is connected to the tendon near the patella.

[0044] Furthermore, the second end of the rope 3 is clamped and fixed to the tendon by the clamping block assembly 5. Specifically, Figure 7 As shown, the clamping block assembly 5 includes a first clamping block 51 and a second clamping block 52. The first and second clamping blocks 51 and 52 have teeth on their opposing surfaces and are fixedly connected by bolts. The toothed clamping block assembly 5 can stably clamp the tendon, preventing it from loosening during testing and ensuring effective testing.

[0045] In one optional embodiment, the sample holder 1 further comprises a fixing rod 16, and a medullary cavity is further provided on the bone body. The fixing rod 16 is inserted into the medullary cavity to achieve auxiliary fixation of the bone model. Specifically, a first center hole 132 is provided at the bottom of the external fixing tube 13, and a second center hole 142 is provided at the bottom of the internal fixing tube 14. The first center hole 132 can be communicated with the internal cavity 111 of the base body 11. The fixing rod 16 can pass through the first center hole 132 and the second center hole 142 in sequence from the internal cavity 111 of the base body 11 and be inserted into the medullary cavity of the bone body. The tail end of the fixing rod 16 comprises a clamping portion, the size of which is larger than the aperture of the first center hole 132. When the fixing rod 16 is inserted, the clamping portion is confined within the internal cavity 111 of the base body 11, thereby achieving a limiting effect on the fixing rod 16.

[0046] In one optional embodiment, the sample holder 1 is detachably mounted on the support frame 12, and the height and fore-aft position of the sample holder 1 can be adjusted. Specifically, the base 11 of the sample holder 1 has an internal cavity 111. A plurality of first adjustment holes 112 communicating with the internal cavity 111 are provided on two opposing sides of the base 11. The first adjustment holes 112 are evenly distributed on the two opposing sides of the base 11. The support frame 12 is provided with a plurality of second adjustment holes 121 distributed longitudinally. When the sample holder 1 is installed, the height and fore-aft position of the sample holder 1 can be adjusted by aligning the first adjustment holes 112 and the second adjustment holes 121 at different positions, and using fixing bolts 122.

[0047] During the test, a patellar nail or other fixation device is implanted into the bone model in advance according to the actual surgical operation to implement the internal fixation of the patella. The bone model that has completed the internal fixation of the patella is the bone model to be tested 2. The bone model to be tested 2 is installed on the sample holder 1. Specifically, the experimental bone model is installed in the internal fixation cylinder 14, and the bone model is fixed by inserting the fixing rod 16 into the medullary cavity. At the same time, bone cement is filled in the bone cement filling space between the bone model and the inner wall of the internal fixation cylinder 14. After the bone cement is fixed, the bone model can be further fixed. During the bone cement fixation process, the posture of the bone model can be fine-tuned. The rope 3 is connected to the main shaft 6 of the testing machine using a pulley structure. The end of the rope 3 is clamped and fixed to the tendon of the bone model to be tested 2 by a toothed clamp. The testing machine is started and used to repeatedly pull the rope 3 under different frequencies and driving force conditions, thereby pulling the tendon to realize the patellar activity during normal movement. In this process, mechanical parameters can be monitored, especially monitoring whether internal fixation devices such as patellar nails are loose, dislocated, displaced, fractured, etc. under certain mechanical experimental conditions, so as to realize the stability comparison of different patellar internal fixation devices, which is conducive to selecting appropriate patellar fixation devices in actual clinical practice and has positive significance for improving the effect of patellar internal fixation surgery.

[0048] Compared with the prior art, the patellar internal fixation testing device provided in this embodiment has the following beneficial effects:

[0049] 1. The device has simple structure, convenient operation and low cost. By testing the stability effect after patellar internal fixation, it can realize the comparison of patellar internal fixation effects of various patellar internal fixation devices such as patellar nails and patellar internal fixators, and then realize the stability comparison of different patellar internal fixation device products, which is conducive to the selection of appropriate patellar fixation devices in actual clinical practice and has positive significance for improving the effect of patellar internal fixation surgery.

[0050] 2. The internal fixation tube and the external fixation tube are detachably connected, so that after completing a test, the internal fixation tube and the bone model can be directly removed from the external fixation tube and replaced with another set of bone model and internal fixation tube, which can improve experimental efficiency.

[0051] 3. Bone cement is also filled between the bone model and the inner wall of the internal fixation tube to further improve the fixation stability of the bone model.

[0052] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of this application. It should be understood that the above description is only the specific implementation methods of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application should be included in the scope of protection of this application.

Claims

1. A patellar internal fixation testing device, characterized in that: It includes a sample holder (1) and a testing machine; The sample holder (1) comprises a holder body (11), a support frame (12), an outer fixed cylinder (13) and an inner fixed cylinder (14); the outer fixed cylinder (13) is fixedly connected to the holder body (11); the support frame (12) is arranged on the holder body (11); the inner fixed cylinder (14) is detachably mounted in the outer fixed cylinder (13); The testing machine has a power output terminal configured to provide a power source during the testing process; The skeletal model (2) to be tested comprises a skeletal body, a tendon, and a patella with internal fixation; one end of the skeletal body away from the patella is fixedly installed in the internal fixation cylinder (14), and a bone cement-filled space is formed between the skeletal body and the inner wall of the internal fixation cylinder (14); the tendon is connected to the power output end via a connector.

2. The patellar internal fixation testing device according to claim 1, characterized in that: The inner fixing cylinder (14) is detachably mounted in the outer fixing cylinder (13).

3. The patellar internal fixation testing device according to claim 2, characterized in that: The outer fixing cylinder (13) and the inner fixing cylinder (14) are fixed by a tightening bolt (15).

4. The patellar internal fixation testing device according to claim 3, characterized in that: The outer fixing cylinder (13) has a bolt hole (131) on its wall, and the inner fixing cylinder (14) has an annular groove (141) on its outer surface. When the inner fixing tube (14) is installed in the outer fixing tube (13), the bolt hole (131) is aligned with the annular groove (141), and the tightening bolt (15) is screwed into the bolt hole (131). The top end of the tightening bolt (15) can abut against the annular groove (141), thereby achieving the fixation of the inner fixing tube (14) and the outer fixing tube (13).

5. The patellar internal fixation testing device according to any one of claims 1 to 4, characterized in that: The connecting member is a rope (3), a fixed pulley (4) is provided on the support frame (12), the rope (3) passes around the fixed pulley (4), a first end of the rope (3) is connected to the power output end, and a second end of the rope (3) is connected to a tendon near the patella.

6. The patellar internal fixation testing device according to claim 5, characterized in that: The second end of the rope (3) is clamped and fixed to the tendon by a clamping block assembly (5), wherein the clamping block assembly (5) comprises a first clamping block (51) and a second clamping block (52), wherein tooth structures are provided on two opposing surfaces of the first clamping block (51) and the second clamping block (52), and the first clamping block (51) and the second clamping block (52) are fixedly connected by bolts.

7. The patellar internal fixation testing device according to any one of claims 1 to 4 and 6, characterized in that: The sample holder (1) also has a fixing rod (16), and a medullary cavity is also provided on the bone body. The fixing rod (16) is inserted into the medullary cavity to achieve auxiliary fixation of the bone model.

8. The patellar internal fixation testing device according to claim 7, characterized in that: The bottom of the external fixing tube (13) is provided with a first center hole (132), and the bottom of the internal fixing tube (14) is provided with a second center hole (142). The first center hole (132) can be communicated with the internal cavity (111) of the seat body (11). The fixing rod (16) can pass through the first center hole (132) and the second center hole (142) in sequence from the internal cavity (111) of the seat body (11) and be inserted into the medullary cavity of the bone body.

9. The patellar internal fixation testing device according to claim 1, characterized in that: The sample holder (1) is detachably mounted on the support frame (12), and the height and front-back position of the sample holder (1) can be adjusted.

10. The patellar internal fixation testing device according to claim 9, characterized in that: The base body (11) has an internal cavity (111), and two opposite side surfaces of the base body (11) are provided with a plurality of first adjustment holes (112) communicating with the internal cavity (111); the support frame (12) is provided with a plurality of second adjustment holes (121) distributed longitudinally; By aligning the first adjustment hole (112) and the second adjustment hole (121) at different positions, the height and front-back position of the sample holder (1) can be adjusted using the fixing bolt (122).

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