An axial compression device for joint specimens

Abstract

This invention relates to medical devices, specifically to an axial compression device for joint specimens, comprising a base; a fixed frame fixedly disposed on the right side of the base; a sliding frame slidably disposed on the left side of the base; and an axial compression structure extending laterally, wherein the left side of the axial compression structure is detachably fixed to the sliding frame, and the right side of the axial compression structure is detachably fixed to the fixed frame; a vertically rotatable right specimen fixing cylinder is connected to the fixed frame, and a vertically rotatable left specimen fixing cylinder is connected to the sliding frame; the two ends of the joint specimen are respectively connected to the right and left specimen fixing cylinders; the axial compression structure can elastically extend and retract laterally to bring the fixed frame closer to or further away from the sliding frame. The axial compression device for joint specimens of this invention can apply a quantitative pressure to human or various animal joint specimens when flexed at 0-150 degrees and rotated internally or externally at any angle, to simulate the changes in a joint under load during movement.

Description

Technical Field

[0001] This invention relates to medical devices, specifically to an axial compression device for joint specimens. Background Technology

[0002] With advancements in clinical diagnosis and experimental research of joint diseases, imaging examinations such as ultrasound, X-ray, computed tomography (CT), and magnetic resonance imaging (MRI) have gradually become routine and necessary examinations. Among these, MRI, due to its accurate imaging of soft tissue anatomy and lesions, can help detect early changes in diseases and has become an indispensable examination. Joint diseases and injuries generally occur under weight-bearing activity, therefore, stress-based assessment of joint disease status has the advantage of more accurate evaluation. However, because MRI requires the patient or specimen to be in a supine position, it cannot reproduce the natural weight-bearing state of the joint, and metallic materials cannot be brought close to the MRI machine, limiting the application of auxiliary devices. As a result, there is still a lack of devices that can apply axial pressure to the patient or specimen. Summary of the Invention

[0003] To address the aforementioned problems, the present invention aims to provide an axial compression device for joint specimens.

[0004] The present invention provides a technical solution for an axial pressure device for articular specimens, comprising a base;

[0005] The mounting bracket is fixedly installed on the right side of the base;

[0006] The sliding bracket is located on the left side of the base and slides left and right.

[0007] An axial pressing structure extends in the left and right directions, with the left side of the axial pressing structure detachably fixed to the sliding frame and the right side of the axial pressing structure detachably fixed to the fixed frame;

[0008] The fixing frame is connected to a right specimen fixing cylinder that can rotate vertically, and the sliding frame is connected to a left specimen fixing cylinder that can rotate vertically. The two ends of the joint specimen are respectively connected to the right specimen fixing cylinder and the left specimen fixing cylinder.

[0009] The axial pressure structure can elastically extend and retract to move the fixed frame closer to or further away from the sliding frame.

[0010] As a preferred embodiment, the axial pressing structure has two parts, which are respectively disposed on the front and rear sides of the joint specimen. The left sides of the two axial pressing structures are detachably fixed to the sliding frame, and the right sides of the two axial pressing structures are detachably fixed to the fixing frame.

[0011] As a preferred embodiment, the fixing frame includes two right ear plates arranged at a distance from front to back, and each right ear plate has multiple right positioning holes arranged in an arc shape on its left side.

[0012] The sliding frame includes two left ear plates arranged at a distance from front to back, and each left ear plate has multiple left positioning holes arranged in an arc shape on its right side;

[0013] The bottom of the right specimen fixing cylinder has at least two right connecting holes, and the right specimen fixing cylinder can rotate up and down so that each of the right connecting holes corresponds to one of the right positioning holes;

[0014] The bottom of the left specimen fixing cylinder has at least two left connecting holes, and the left specimen fixing cylinder can rotate up and down so that each of the left connecting holes corresponds to one of the left positioning holes;

[0015] Both the right connecting hole and the left connecting hole are fitted with fasteners that can be detached and pass through the right positioning hole or the left positioning hole.

[0016] As a preferred embodiment, the upper part of both the right specimen fixing tube and the upper part of the left specimen fixing tube are provided with a plurality of specimen connection holes for connecting joint specimens. The specimen connection holes on the right specimen fixing tube are arranged axially, and the specimen connection holes on the left specimen fixing tube are also arranged axially.

[0017] As a preferred embodiment, the sliding frame further includes a base plate for connecting the two left ear plates;

[0018] Vertically extending positioning holes are provided on the front and rear sides of the bottom of the base and on the front and rear sides of the base plate.

[0019] Both ends of the axial pressure structure have positioning rods, and each positioning rod is inserted into the positioning hole in a corresponding manner.

[0020] As a preferred embodiment, the two axial pressing structures are identical in structure, each including a sleeve extending to the left and right, a left slide rod slidably inserted on the left side of the sleeve, and a right slide rod slidably inserted on the right side of the sleeve.

[0021] The left side of the left slide rod extends to the outside of the sleeve, and the right side of the right slide rod extends to the outside of the sleeve;

[0022] The bottom left side of the left slide rod and the bottom right side of the right slide rod are both fixedly connected to a positioning rod;

[0023] An elastic fixing member connects the left slide rod and the right slide rod.

[0024] As a preferred embodiment, the left slide rod has a left slide cavity, the right slide rod has a right slide cavity, a slider is slidably disposed in the right slide cavity, and a long screw extending to the outside of the right end of the right slide rod is threadedly mounted on the slider. The right end of the long screw abuts against the right end of the right slide cavity, and the slider and the right slide cavity are connected by an elastic element.

[0025] As a preferred embodiment, the elastic element is an elastic rope.

[0026] As a preferred embodiment, the base also includes a fixed bracket disposed at the lower part of the base, the fixed bracket including a connecting rod extending vertically upward;

[0027] The base has a sliding groove extending to the left and right on its left side;

[0028] The connecting rod passes through the slide groove and can slide along the slide groove, and the top of the connecting rod is fixedly connected to the sliding frame.

[0029] As a preferred embodiment, the fixing frame and the base are integrally formed.

[0030] Compared to existing technologies, the beneficial effects of this application are:

[0031] The axial compression device for articular specimens of this application has a fixed frame and a sliding frame respectively provided on the left and right sides of the base. The sliding frame can slide left and right along the left side of the base. The left side of the axial compression structure is detachably fixed to the sliding frame, and the right side of the axial compression structure is detachably fixed to the fixed frame. A first specimen fixing cylinder that can rotate vertically is connected to the fixed frame, and a second specimen fixing cylinder that can rotate vertically is connected to the sliding frame. The two ends of the articular specimen are respectively connected to the first specimen fixing cylinder and the second specimen fixing cylinder. The axial compression structure can elastically extend and retract left and right to drive the sliding frame to slide left and right, and the axial extension and retraction force of the axial compression structure can provide axial elastic force between the fixed frame and the sliding frame. The specimen cylinder and the fixed frame can be fixed at 0°-75°. The specimen can be rotated inward and outward at any angle to be fixed to the specimen cylinder, so as to ultimately achieve the purpose of applying axial pressure to the articular specimen when the articular specimen is flexed at 0°-150° and rotated inward and outward at any angle.

[0032] The base, fixing frame, and sliding frame in this application are all made of non-metallic materials, including but not limited to polyethylene, ABS, carbon fiber, PC, PMMA, etc. Non-magnetic metallic materials such as titanium, aluminum, copper, magnesium-aluminum alloy, copper-zinc alloy, etc. can also be used.

[0033] This invention provides an axial compression device for joint specimens. This device can apply a quantitative pressure to human or various animal joint specimens when they are flexed at 0-150 degrees and rotated at any angle, to simulate the changes of joints under weight-bearing conditions. It can fill the deficiencies and gaps in existing MRI examinations, significantly improve the sensitivity of MRI examinations, and has important value for medical research on musculoskeletal injuries. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the axial compression device for joint specimens of the present invention;

[0035] Figure 2 for Figure 1 Top view;

[0036] Figure 3 This is a schematic diagram of the main structure of the base;

[0037] Figure 4 Bit Figure 3 Top view;

[0038] Figure 5 for Figure 3 Side view;

[0039] Figure 6 This is a schematic diagram of the main structure of the sliding frame;

[0040] Figure 7 for Figure 6 Top view;

[0041] Figure 8 for Figure 6 Side view;

[0042] Figure 9 A schematic diagram of the main structure of the axially pressurized structure;

[0043] Figure 10 for Figure 9 Side view;

[0044] Figure 11 This is a schematic diagram of the structure of the left specimen fixation tube;

[0045] Figure 12 for Figure 1 Side view;

[0046] Figure 13 A schematic diagram of the structure for fixing the bracket legs;

[0047] Figure 14 for Figure 13 Top view.

[0048] Among them, 1. base, 11. slide groove, 2. fixing frame, 21. right ear plate, 22. right positioning hole, 23. insertion hole, 3. sliding frame, 31. left ear plate, 32. left positioning hole, 33. bottom plate, 34. positioning hole, 4. right specimen fixing cylinder, 41. right connecting hole, 42. specimen connecting hole, 5. left specimen fixing cylinder, 6. joint specimen, 7. axial pressure structure, 71. positioning rod, 72. sleeve, 73. left slide rod, 74. right slide rod, 741. right sliding cavity, 75. elastic element, 76. slider, 77. long screw, 8. fixing bracket, 81. connecting rod. Detailed Implementation

[0049] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0050] A preferred embodiment of the 6-axial compression device for articular specimens of the present invention is as follows: Figures 1 to 14 As shown, the specimen includes a base 1 and an axial pressing structure 7. A fixing frame 2 is fixedly mounted on the right side of the base 1, and a sliding frame 3 is slidably mounted on the left side of the base 1. The axial pressing structure 7 extends in the left and right directions. The left side of the axial pressing structure 7 is detachably fixed to the sliding frame 3, and the right side of the axial pressing structure 7 is detachably fixed to the fixing frame 2. A vertically rotatable right specimen fixing cylinder 4 is connected to the fixing frame 2, and a vertically rotatable left specimen fixing cylinder 5 is connected to the sliding frame 3. The two ends of the joint specimen 6 are respectively connected to the right specimen fixing cylinder 4 and the left specimen fixing cylinder 5. The left specimen fixing cylinder 5 and the right specimen fixing cylinder 4 can be rotated to adapt to the flexion angle of the joint specimen 6, thereby adjusting the joint of the specimen. After being rotated inward and outward to the required angle, it is connected to the specimen fixation tube. Specifically, the inward and outward rotation of the joint refers to the rotation of the upper and lower parts of the joint in the axial direction to produce a certain angle, which is equivalent to the thigh pointing to the left and the lower leg and toes pointing to the right when standing. This rotation is achieved by rotating the joint specimen inward and outward to the required angle and then connecting it to the specimen fixation tube. At the same time, the distance between the fixation frame 2 and the sliding frame 3 can be adjusted. The axial pressure structure 7 can also be used to drive the sliding frame 3 to slide left and right due to its elastic extension and contraction properties. The axial extension and contraction force of the axial pressure structure 7 is used to provide axial elastic force between the fixation frame 2 and the sliding frame 3, so as to ultimately achieve the purpose of applying axial pressure to the joint specimen 6.

[0051] In a specific embodiment of this application, in order to ensure that the front and rear sides of the joint specimen 6 receive uniform axial pressure, two axial pressing structures 7 are specifically provided. The two axial pressing structures 7 are respectively provided on the front and rear sides of the joint specimen 6. The left side of both axial pressing structures 7 is detachably fixed to the sliding frame 3, and the right side of both axial pressing structures 7 is detachably fixed to the fixing frame 2, so as to realize the synchronous application of axial force and synchronous positioning of the two axial pressing structures 7.

[0052] Furthermore, the fixing frame 2 includes two right ear plates 21 arranged at intervals, each right plate having multiple right positioning holes 22 arranged in an arc shape on its left side; the sliding frame 3 includes two left ear plates 31 arranged at intervals, each left ear plate 31 having multiple left positioning holes 32 arranged in an arc shape on its right side; the bottom of the right specimen fixing cylinder 4 has at least two right connecting holes 41, and the right specimen fixing cylinder 4 can rotate up and down so that each right connecting hole 41 corresponds to a right positioning hole 22; the bottom of the left specimen fixing cylinder 5 has at least two left connecting holes, and the left specimen fixing cylinder 5 can rotate up and down so that each left connecting hole corresponds to a left positioning hole 32. Fasteners that can be detached and pass through the left positioning hole 32 or the right positioning hole 22 are installed in both the left and right connecting holes 41. Multiple left positioning holes 32 and multiple right positioning holes 22 are arranged in an arc shape, allowing the left specimen fixing cylinder 5 and the right specimen fixing cylinder 4 to rotate so that the joint specimen 6 can rotate. The left specimen fixing cylinder 5 and the right specimen fixing cylinder 4 are fixed by detachable fasteners.

[0053] Specifically, the upper parts of the left ear plate 31 and the right ear plate 21 are both semi-circular supports. Multiple left positioning holes 32 and multiple right positioning holes 22 are arranged on the edge of the semi-circular supports. The corresponding angles of each left positioning hole 32 are 0°, 15°, 30°, 45°, 60°, and 75°, respectively, and the corresponding angles of each right positioning hole 22 are 0°, 15°, 30°, 45°, 60°, and 75°, respectively. A force-measuring connecting ring can be connected to the left end of the sliding frame 3 for hanging a spring force-measuring device.

[0054] Furthermore, both the upper part of the right specimen fixing cylinder 4 and the upper part of the left specimen fixing cylinder 5 are provided with multiple specimen connection holes 42 for connecting the joint specimen 6. The specimen connection holes 42 on the right specimen fixing cylinder 4 are arranged in a ring shape along the axial direction and are connected to the right side of the joint specimen 6 by fasteners. The specimen connection holes 42 on the left specimen fixing cylinder 5 are arranged in a ring shape along the axial direction and are connected to the left side of the joint specimen 6 by fasteners. The specific fasteners can be bolts or pins, etc.

[0055] In one embodiment of this application, the sliding frame 3 further includes a base plate 33 for connecting the two left ear plates 31; vertically extending insertion holes 23 are provided on the front and rear sides of the bottom of the base 1 and the front and rear sides of the base plate 33, and specific positioning holes 34 are provided on the front and rear edges of the bottom of the base plate 33 and the base 1. Both ends of the axial pressing structure 7 have positioning rods 71, and each positioning rod 71 is matched and inserted into the insertion hole 23 to fix the two ends of the axial pressing structure 7. In other embodiments of this application, the axial pressing structure 7 can also be connected to the base plate 33 and the bottom of the base 1 by pre-reserving holes in the circumferential pressing structure, and fasteners passing through the holes and positioning holes 34.

[0056] Furthermore, in the embodiments of this application, the two axial pressure structures 7 have the same structure, both including a sleeve 72 extending to the left and right, a left slide rod 73 slidably inserted on the left side of the sleeve 72, and a right slide rod 74 slidably inserted on the right side of the sleeve 72; the left slide rod 73 and the right slide rod 74 can slide inside the sleeve 72. In a specific embodiment, both ends of the sleeve 72 are also provided with inwardly protruding edges, and the right end of the left slide rod 73 and the left end of the right slide rod 74 both have protrusions that stop with the edges to prevent the left slide rod 73 and the right slide rod 74 from slipping out of the sleeve 72.

[0057] Furthermore, the left side of the left slide rod 73 extends to the outside of the sleeve 72, and the right side of the right slide rod 74 extends to the outside of the sleeve 72. The bottom left side of the left slide rod 73 and the bottom right side of the right slide rod 74 are both fixedly connected to the aforementioned positioning rod 71. The positioning rod 71 is used to be inserted into the positioning hole 34 to position the axial pressure structure 7. An elastic fastener is connected between the left slide rod 73 and the right slide rod 74. The elastic fastener is used to generate an axial elastic force between the left slide rod 73 and the right slide rod 74 and transmit it to the fixed seat and the sliding seat to apply axial pressure to the joint specimen 6.

[0058] Furthermore, the specific structure of the elastic fixing member includes: the left slide rod 73 has a left slide cavity, the right slide rod 74 has a right slide cavity 741, a slider 76 is slidably disposed in the right slide cavity 741, and a long screw 77 extending to the outside of the right end of the right slide rod 74 is threadedly mounted on the slider 76. The slider 76 and the right slide cavity 741 are connected by an elastic element 75, and the right end of the long screw 77 abuts against the right end of the right slide cavity 741; specifically, a screw cap is provided at the right end of the long screw 77, which stops at the right end of the right slide cavity 741. Rotating the long screw 77 can drive the slider 76 along the right slide cavity 741 to adjust the extension and retraction of the elastic element 75 to achieve the purpose of adjusting the axial force; specifically, the tension can be measured by the force measuring ring, and the tension when the slider 76 begins to move away from the opposite specimen can be read, and the long screw 77 can be precisely adjusted to the required value, which is the axial pressure applied to the joint by the device after the spring force measuring device is removed.

[0059] Furthermore, in a specific embodiment of this application, the elastic element 75 is a spring or an elastic rope.

[0060] The axial pressure device for the joint specimen 6 in this application also includes a fixed bracket 8 disposed at the lower part of the base 1. The fixed bracket 8 includes a connecting rod 81 extending vertically upward. A sliding groove 11 extending left and right is provided on the left side of the base 1. The connecting rod 81 passes through the sliding groove 11 and can slide along the sliding groove 11. The top of the connecting rod 81 is fixedly connected to the sliding frame 3. When the sliding frame 3 slides, the connecting rod 81 can slide along the sliding groove 11, so as to realize the sliding frame 3 sliding along the sliding groove 11.

[0061] In a specific embodiment of this application, the fixing frame 2 and the base 1 are integrally formed; in other embodiments of this application, the fixing frame 2 and the base 1 can also be fastened together by fasteners, etc.

[0062] The specific method of using the axial pressure device for the joint specimen 6 in this application is as follows: Place both ends of the joint specimen 6 into two specimen fixing cylinders; adjust the axial angle between the joint specimen 6 and the specimen fixing cylinders; then screw in the specimen fixing screws to determine the inward and outward rotation angles; connect the specimen fixing cylinder containing the joint specimen 6 to the semi-circular bracket of the fixing frame 2 and the sliding frame 3 via specimen cylinder fixing screws; assemble the fixing frame 2 by having its legs pass through the sliding groove 11 of the base 1 and the sliding fixing frame 2 to form a sliding structure; screw in the angle adjustment screws to fix the joint specimen 6. The required flexion angle is determined by the sum of the two positioning angles. For example, if the two specimen tubes are fixed at the 15° hole position, the joint flexion angle is 30°. The positioning rod 71 is inserted into the corresponding positioning hole 34 of the base 1 and the sliding frame 3 respectively. The long screw 77 is tightened to apply axial pressure. The tension is measured by the force measuring device connecting ring. The tension when the slider 76 starts to move away from the opposite specimen is read. The nut is precisely adjusted to the required value. This value is the axial pressure applied to the joint by the device after the spring force measuring device is removed.

[0063] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. An axial compression device for a joint specimen, characterized in that, include: Base; The mounting bracket is fixedly installed on the right side of the base; The sliding bracket is located on the left side of the base and slides left and right. An axial pressing structure extends in the left and right directions, with the left side of the axial pressing structure detachably fixed to the sliding frame and the right side of the axial pressing structure detachably fixed to the fixed frame; The fixing frame is connected to a right specimen fixing cylinder that can rotate vertically, and the sliding frame is connected to a left specimen fixing cylinder that can rotate vertically. The two ends of the joint specimen are respectively connected to the right specimen fixing cylinder and the left specimen fixing cylinder. The axial pressure structure can elastically extend and retract to move the fixed frame closer to or further away from the sliding frame.

2. The axial compression device for joint specimens according to claim 1, characterized in that: The axial pressing structure has two parts, which are respectively located on the front and rear sides of the joint specimen. The left sides of both axial pressing structures are detachably fixed to the sliding frame, and the right sides of both axial pressing structures are detachably fixed to the fixing frame.

3. The axial compression device for articular specimens according to claim 1 or 2, characterized in that: The fixing frame includes two right ear plates arranged at a distance from front to back, and each right ear plate has multiple right positioning holes arranged in an arc shape on its left side; The sliding frame includes two left ear plates arranged at a distance from front to back, and each left ear plate has multiple left positioning holes arranged in an arc shape on its right side; The bottom of the right specimen fixing cylinder has at least two right connecting holes, and the right specimen fixing cylinder can rotate up and down so that each of the right connecting holes corresponds to one of the right positioning holes; The bottom of the left specimen fixing cylinder has at least two left connecting holes, and the left specimen fixing cylinder can rotate up and down so that each of the left connecting holes corresponds to one of the left positioning holes; Both the right connecting hole and the left connecting hole are fitted with fasteners that can be detached and pass through the right positioning hole or the left positioning hole.

4. The axial compression device for joint specimens according to claim 3, characterized in that: The upper part of the right specimen fixing tube and the upper part of the left specimen fixing tube are provided with a plurality of specimen connection holes for connecting joint specimens. All specimen connection holes on the right specimen fixing tube are arranged axially, and all specimen connection holes on the left specimen fixing tube are arranged axially.

5. The axial compression device for joint specimens according to claim 3, characterized in that: The sliding frame also includes a base plate for connecting the two left ear plates; Vertically extending positioning holes are provided on the front and rear sides of the bottom of the base and on the front and rear sides of the base plate. Both ends of the axial pressure structure have positioning rods, and each positioning rod is inserted into the positioning hole in a corresponding manner.

6. The axial compression device for joint specimens according to claim 5, characterized in that: The two axial pressure structures are identical in structure, each including a sleeve extending to the left and right, a left slide rod slidably inserted on the left side of the sleeve, and a right slide rod slidably inserted on the right side of the sleeve; The left side of the left slide rod extends to the outside of the sleeve, and the right side of the right slide rod extends to the outside of the sleeve; The bottom left side of the left slide rod and the bottom right side of the right slide rod are both fixedly connected to a positioning rod; An elastic fixing member connects the left slide rod and the right slide rod.

7. The axial compression device for joint specimens according to claim 6, characterized in that: The left slide rod has a left slide cavity, and the right slide rod has a right slide cavity. A slider is slidably disposed in the right slide cavity. A long screw extending to the outside of the right end of the right slide rod is rotatably mounted on the slider. The right end of the long screw abuts against the right end of the right slide cavity. The slider and the right slide cavity are connected by an elastic element.

8. The axial compression device for joint specimens according to claim 7, characterized in that: The elastic element is an elastic rope.

9. The axial compression device for joint specimens according to claim 1, characterized in that: It also includes a fixed bracket disposed at the lower part of the base, the fixed bracket including a connecting rod extending vertically upward; The base has a sliding groove extending to the left and right on its left side; The connecting rod passes through the slide groove and can slide along the slide groove, and the top of the connecting rod is fixedly connected to the sliding frame.

10. The axial compression device for articular specimens according to claim 1, characterized in that: The mounting bracket is integrally formed with the base.

Images