Intervertebral disc elastic stretching stress applying device

Abstract

The intervertebral disc elastic stretching stress applying device comprises a main body frame mechanism and a stress applying mechanism, the main body frame mechanism comprises two main rods arranged in parallel and two kirschner wires arranged in parallel; the kirschner wire is perpendicular to the main rod; wherein two ends of one kirschner wire respectively penetrate through a connecting block A which is in sliding connection with the middle part of the main rod so as to realize relative sliding with the main rod, and two ends of the other kirschner wire respectively penetrate through a connecting block B which is in threaded connection with the rear end of the main rod so as to keep relative fixation with the main rod; the stress applying mechanism is detachably installed between the connecting block A and the rear end of the main rod and used for applying stretching stress enabling the two kirschner wires to tend to be relatively away from each other. The device acts on the lumbar vertebra of a large animal, can provide adjustable stretching stress for the intervertebral disc, further obtains change data of the intervertebral disc under the action of different stretching stress, and provides a theoretical basis for prevention and treatment of human intervertebral disc degeneration diseases.

Description

Technical Field

[0001] The utility model relates to the technical field of intervertebral disc lesion research experiments, in particular to an intervertebral disc elastic stretching stress applying device and a force applying method. Background Art

[0002] Lumbar disc herniation causing lower back and leg pain has become a common and frequently occurring disease. With the advancement of science, people are becoming less active when traveling and working, and more sedentary. This can cause prolonged compression of the lumbar disc, leading to abnormal compressive stress and disc pathology, which in turn compresses the nerves and causes lower back and leg pain.

[0003] To prevent lumbar disc disease, experimental studies using animals to apply compressive and tensile stress to the intervertebral disc are necessary. This data, which can be used to determine the changes in degenerative discs under tensile stress, could provide a theoretical basis for the prevention and treatment of human disc degeneration. However, dedicated experimental devices for this purpose are currently unavailable on the market. Utility Model Content

[0004] The purpose of the present utility model is to overcome the deficiencies of the prior art and to provide an intervertebral disc elastic stretch stress application device, which acts on the lumbar vertebrae of large animals (such as cattle, sheep, horses, etc.) and can provide adjustable stretch stress to the intervertebral disc, thereby obtaining the change data of the intervertebral disc under different stretch stresses, and providing a theoretical basis for the prevention and treatment of human intervertebral disc degeneration diseases.

[0005] The technical solution of the utility model is: an intervertebral disc elastic stretching stress applying device, comprising a main frame mechanism and a stress applying mechanism; the main frame mechanism comprises two parallel main rods and two parallel Kirschner wires; the Kirschner wires and the main rods are arranged perpendicular to each other; the two ends of one Kirschner wire respectively pass through a connecting block A slidably connected to the middle part of the main rod to achieve relative sliding with the main rod, and the two ends of the other Kirschner wire respectively pass through a connecting block B threadedly connected to the rear end of the main rod to remain relatively fixed with the main rod; the stress applying mechanism is detachably installed between the connecting block A and the rear end of the main rod, and is used to apply a stretching stress that causes the two Kirschner wires to have a tendency to move relatively away from each other.

[0006] A further technical solution of the utility model is: a polished rod section is provided in the front middle part of the main rod, and an enlarged diameter end head and an external threaded section A are respectively provided at the front and rear ends of the polished rod section, and a positioning surface is provided between the enlarged diameter end head and the polished rod section; a pinhole A, a rod through hole A and a first locking hole are provided on the connecting block A; the pinhole A and the rod through hole A are arranged vertically in a cross shape and are not connected to each other, the first locking hole is a light hole, and the first locking hole passes through the outer surface of the connecting block A to the pinhole A; the connecting block A is slidably installed on the polished rod section or the external threaded section A of the main rod through the rod through hole A; the installation positions of the two connecting blocks A on the two main rods are the same, so that the pinhole holes A of the two connecting blocks A are arranged facing each other; a pinhole B and a screw-in hole are provided on the connecting block B; the pinhole hole B and the screw-in hole are arranged vertically in a cross shape and are not connected to each other; the connecting block B is threadedly connected to the external threaded section A of the main rod through the screw-in hole; the connection positions of the two connecting blocks B on the two main rods are the same, so that the pinhole holes B of the two connecting blocks B are arranged facing each other.

[0007] A further technical solution of the present invention is: the two ends of one Kirschner wire respectively pass through the needle holes A of the two connecting blocks A and are installed on the two connecting blocks A, and the two connecting blocks A are respectively slidably connected to the bare rod sections or external threaded sections A of the two main rods through the rod holes A; the two connecting blocks B are respectively threadedly connected to the external threaded sections A of the two main rods through the screw-in holes, and the two ends of another Kirschner wire respectively pass through the needle holes B of the two connecting blocks B and are installed on the two connecting blocks B.

[0008] A further technical solution of the present invention is: there are two sets of stress applying mechanisms, the first set of stress applying mechanisms is arranged between the rear end of one of the main rods and the connecting block A installed thereon, and the second set of stress applying mechanisms is arranged between the rear end of the other main rod and the connecting block A installed thereon, and the two sets of stress applying mechanisms are arranged symmetrically.

[0009] A further technical solution of the present invention is that the stress applying mechanism includes a push block, a secondary rod, a nut and a spring; a sliding hole and a hook arc are provided on the push block, and the push block is hooked on the external threaded section A at the rear end of the main rod through the hook arc; the front middle and rear ends of the secondary rod are respectively provided with an external threaded section B and a connecting end, and the connecting end is provided with a through threaded through hole, and the connecting end at the rear end of the secondary rod is placed on the connecting block A, and the threaded through hole of the secondary rod is arranged opposite to the first locking hole of the connecting block A, and then the rotational connection between the secondary rod and the connecting block A and the relative fixation of the Kirschner wire and the connecting block A are realized by screwing into the threaded through hole and passing through the first locking hole. The external threaded section B at the front end of the secondary rod can move through the sliding hole of the push block; the nut is threadedly connected to the external threaded section B of the secondary rod and is located between the push block and the connecting end of the secondary rod; the spring is sleeved on the secondary rod and compressed between the push block and the nut.

[0010] A further technical solution of the present invention is: when the push block is hooked on the external threaded section A at the rear end of the main rod, the spring forces the rear end surface of the push block to press against the connecting block B through elastic force, thereby causing the two Kirschner wires to tend to move away from each other, thereby achieving the application of tensile stress.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] It acts on the lumbar vertebrae of large animals (such as cattle, sheep, horses, etc.), can provide adjustable tensile stress to the intervertebral disc, and then obtain the change data of the intervertebral disc under different tensile stress, providing a theoretical basis for the prevention and treatment of human intervertebral disc degeneration disease.

[0013] The present invention will be further described below with reference to the drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the utility model;

[0015] Figure 2 The structural diagram of the main rod;

[0016] Figure 3 It is a structural diagram of the connection block A;

[0017] Figure 4 It is a structural diagram of the connection block B;

[0018] Figure 5 It is the structural diagram of the auxiliary rod;

[0019] Figure 6 It is a structural diagram of the push block;

[0020] Figure 7 This is a structural diagram of the elastic force measuring device in the compressed state of the spring.

[0021] Legend: Main rod 1; polished rod section 11; expanded diameter end 12; external threaded section A13; Kirschner wire 2; connecting block A31; needle hole A311; rod hole A312; first locking hole 313; connecting block B32; needle hole B321; screw-in hole 322; push block 4; sliding hole 41; hook arc bend 42; auxiliary rod 5; external threaded section B51; connecting end 52; threaded through hole 521; nut 6; spring 7; cylindrical tube 81; central axis 82; supporting plate 83; pressure sensor 84; connecting frame 85; connecting plate 851; docking plate 852; connecting column 853; hydraulic cylinder 86; locking screw 100. DETAILED DESCRIPTION Example 1

[0022] like Figure 1-6As shown, the intervertebral disc elastic stretching stress applying device includes a main frame mechanism and a stress applying mechanism.

[0023] The main frame structure consists of two parallel main rods 1 and two parallel Kirschner wires 2. The Kirschner wires 2 are arranged perpendicular to the main rods 1. The ends of one Kirschner wire 2 slide relative to the main rod 1 by passing through a connecting block A31 slidably connected to the middle of the main rod 1. The ends of the other Kirschner wire 2 pass through a connecting block B41 fixedly mounted at the rear end of the main rod 1, maintaining relative fixation to the main rod 1.

[0024] A polished rod section 11 is provided at the front of the main rod 1. An expanded end 12 and an externally threaded section A13 are provided at the front and rear ends of the polished rod section 11, respectively. A positioning surface is provided between the expanded end 12 and the polished rod section 11. A pinhole A311, a rod hole A312, and a first locking hole 313 are provided on the connecting block A31. The pinhole A311 and rod hole A312 are arranged vertically in a cross shape and are not interconnected. The first locking hole 313 is a smooth hole that extends from the outer surface of the connecting block A31 to the pinhole A311. The connecting block A31 is slidably mounted on the polished rod section 11 or the externally threaded section A13 of the main rod 1 through the rod hole A312. The two connecting blocks A31 are installed in the same position on the two main rods 1, so that the pinholes A311 of the two connecting blocks A31 are arranged directly opposite each other. The connecting block B32 is provided with a pinhole B321 and a screw-in hole 322. The needle holes B321 and the screw-in holes 322 are arranged vertically in a cross shape and are not interconnected. The connecting block B32 is threadedly connected to the externally threaded section A13 of the main rod 1 through the screw-in holes 322. The two connecting blocks B32 are connected at the same position on the two main rods 1, so that the needle holes B321 of the two connecting blocks B23 are arranged opposite each other. One of the Kirschner wires 2 is installed on the two connecting blocks A31 by passing the needle holes A311 of the two connecting blocks A31 at both ends. The two connecting blocks A31 are slidably connected to the bare rod sections 11 or externally threaded sections A13 of the two main rods 1 through the rod-penetrating holes A312. The two connecting blocks B32 are threadedly connected to the externally threaded sections A13 of the two main rods 1 through the screw-in holes 322. The other Kirschner wire 2 is installed on the two connecting blocks B31 by passing the needle holes B311 of the two connecting blocks B32 at both ends.

[0025] The stress-applying mechanism is removably mounted between the connecting block B32 and the rear end of the main rod 1. It is used to apply tensile stress that forces the two K-wires 2 to move apart. There are two sets of stress-applying mechanisms: the first set is located between the rear end of one main rod 1 and the connecting block A31 mounted thereon, and the second set is located between the rear end of the other main rod 1 and the connecting block A31 mounted thereon. The two sets of stress-applying mechanisms are arranged symmetrically.

[0026] The stress applying mechanism includes a push block 4, a secondary rod 5, a nut 6 and a spring 7. The push block 4 is provided with a sliding hole 41 and a hook arc 42, and the push block 4 is hooked on the external thread segment A13 at the rear end of the main rod 1 through the hook arc 42. The front middle and rear ends of the secondary rod 5 are respectively provided with an external thread segment B51 and a connecting end 52, and the connecting end 52 is provided with a through threaded through hole 521. The connecting end 52 at the rear end of the secondary rod 5 is placed on the connecting block A31, and the threaded through hole 521 of the secondary rod 5 is arranged to face the first locking hole 313 of the connecting block A31. Then, by screwing the locking screw 100 into the threaded through hole 521 and passing it into the first locking hole 313, the rotational connection between the secondary rod 5 and the connecting block A31 and the relative fixation of the Kirschner wire 2 and the connecting block A31 are achieved. The external thread segment B51 at the front end of the secondary rod 5 can move through the sliding hole 41 of the push block 4. The nut 6 is threadedly connected to the external thread section B51 of the auxiliary rod 5 and is located between the push block 4 and the connecting end 52 of the auxiliary rod 5. The spring 7 is sleeved on the auxiliary rod 5 and compressed between the push block 4 and the nut 6.

[0027] In this embodiment, when the push block 4 is hooked on the external threaded section A13 at the rear end of the main rod 1, the spring 7 forces the rear end face of the push block 4 to press against the connecting block B32 through elastic force, thereby causing the two Kirschner wires 2 to tend to move away from each other, thereby achieving the application of tensile stress.

[0028] Briefly describe the working principle of this utility model:

[0029] A method for applying elastic stretch stress is based on an intervertebral disc elastic stretch stress applying device. Before applying compressive stress and stretch stress, a spring compression state elastic force measuring device is used to measure the elastic force of the spring in different compression states and record the results for future use.

[0030] The device for measuring the elastic force of a spring in a compressed state includes a cylindrical barrel 81, a central shaft 82, a support plate 83, a pressure sensor 84, a connecting frame 85, a hydraulic cylinder 86, an STM32 microcontroller, and a personal computer. The cylindrical barrel 81 is in the shape of a sleeve with one end closed and the other open. An annular spring positioning groove A is provided on the bottom surface of the inner cavity of the cylindrical barrel 81. The cylindrical barrel 81 is made of a transparent material, and a length scale is provided on the outer wall of the cylindrical barrel 81 along the axial direction. The central shaft 82 is fixedly disposed in the inner cavity of the cylindrical barrel 81, with the inner end of the central shaft 82 fixedly connected to the center of the inner cavity bottom surface of the cylindrical barrel 81, and the outer end of the central shaft 82 extends toward the open end of the cylindrical barrel 81, with the axis of the central shaft 82 coinciding with the centerline of the cylindrical barrel 81. A through-hole A is defined in the center of the support plate 83, through which the central shaft 82 passes. The support plate 83 is inserted into the central shaft 82 through the through-hole A and positioned within the inner cavity of the cylindrical barrel 81. An annular spring retaining groove B is defined on the end surface of the support plate 83 facing the inner cavity of the cylindrical barrel 81, and the spring retaining groove B is positioned opposite the spring retaining groove A. Multiple pressure sensors 84 are evenly distributed in an annular pattern around the through-hole A of the support plate 83 and embedded on the end surface of the support plate 83 facing away from the inner cavity of the cylindrical barrel 81. The connecting frame 85 comprises a connecting plate 851 and a docking plate 852, each of which is positioned opposite each other. The docking plate 852 has a through-hole B defined at its center, through which the central shaft passes. The connecting plate 851 and the docking plate 852 are fixedly connected as a single unit by a plurality of connecting posts 853. The docking plate 852 extends through the outer end of the central shaft 82 through the through-hole B and faces all of the pressure sensors 84. The connecting plate 851 is hingedly connected to the piston rod end of the hydraulic cylinder 86 at its center. The axis of the piston rod of the hydraulic cylinder 86 coincides with the axis of the central shaft 82. The STM32 microcontroller is electrically connected to all the pressure sensors 84. The PC is electrically connected to the STM32 microcontroller.

[0031] The process of measuring the elastic force of the spring is as follows: the spring (the elastic force to be measured) is sleeved on the central shaft 82 and installed in the inner cavity of the cylindrical tube 81, so that the two ends of the spring are respectively embedded in the spring positioning groove A and the spring positioning groove B. The piston rod of the hydraulic cylinder 86 is controlled to extend so that the docking plate 852 fits with all the pressure sensors 84. After confirming that the through-axis hole B of the docking plate 852 and the through-axis hole A of the supporting plate 83 are not in contact with the central shaft 82, and the outer cylindrical surface of the docking plate 852 and the outer cylindrical surface of the supporting plate 83 are not in contact with the inner cavity of the cylindrical tube 81. The piston rod of the hydraulic cylinder 86 is controlled to extend intermittently, and the elastic force of the spring under different compression degrees is recorded at the same time. As the piston rod of the hydraulic cylinder 86 is gradually extended, the compression degree of the spring gradually increases, and the thrust required to overcome the elastic force of the spring also gradually increases. When the spring is at any compression level, the length of the spring at the current compression level can be known by reading the length scale on the cylinder 81. The average pressure value of all pressure sensors 84 can be read by a PC to obtain the elastic force of the spring at the current compression level.

[0032] The tensile stress is applied as follows:

[0033] The two stress-applying mechanisms are installed between the rear ends of the two main rods 1 and the connecting block A31, ensuring that the two stress-applying mechanisms are symmetrically arranged. In this state, the push block 4 is hooked onto the externally threaded section A13 at the rear end of the main rod 1 via the hook bend 42. The compression level of the springs 7 in the two stress-applying mechanisms remains consistent, ensuring a consistent elastic force applied to both ends of the K-wire 2.

[0034] The nuts 6 in the two stress-applying mechanisms are synchronously rotated to adjust the compression of the springs 7 in the two stress-applying mechanisms, thereby synchronously changing the degree of compression of the springs 7 in the two stress-applying mechanisms, thereby applying different amounts of tensile stress. The elastic force of the spring 7 acts on the push block 4 and presses the push block 4 against the connecting block B32. Through the transmission of force, the two connecting blocks B32 and the Kirschner wires 2 passing through the two connecting blocks B32 tend to move away from each other, thereby applying tensile stress. By measuring the current length of the spring 7, the current elastic force of the spring 7 can be known, and this elastic force value is the tensile stress value. The greater the degree of compression of the spring 7, the greater the tensile stress applied to the Kirschner wire 2, and the smaller the degree of compression of the spring 7, the smaller the tensile stress applied to the Kirschner wire 2.

[0035] Examples of applications of this utility model:

[0036] Taking a goat as an example, two Kirschner wires are inserted parallel to each other through the goat's lumbar vertebrae (L4 and L5), with both ends of the wires exposed approximately 2 cm above the skin. First, the two main rods 1 are inserted into the two connecting blocks A31 and screwed into the two connecting blocks B32 (each main rod 1 is inserted into one connecting block A31 and screwed into one connecting block B32). Then, one main rod 1, along with its connecting blocks A31 and B32, is inserted over the front ends of the two Kirschner wires. The other main rod 1, along with its connecting blocks A31 and B32, is inserted over the rear ends of the two Kirschner wires. Then, one Kirschner wire is secured to the two connecting blocks A31 using two locking screws A100, and the other Kirschner wire is secured to the two connecting blocks B32 using two locking screws 100. This completes the installation of the main frame mechanism on the goat's L4-L5 vertebrae.

[0037] When tensile stress is required, the first set of stress-applying mechanisms is positioned between the rear end of one of the main rods 1 and the connecting block A31 mounted thereon, while the second set of stress-applying mechanisms is positioned between the rear end of the other main rod 1 and the connecting block A31 mounted thereon. The two sets of stress-applying mechanisms are arranged symmetrically. Specifically, the auxiliary rod 5 is first connected to the connecting block A31 at the connecting end 52 via the locking screw 100. The nut 6 is then screwed onto the externally threaded section B51 of the auxiliary rod 5. The spring 7 and push block 4 are then fitted onto the auxiliary rod 5. Finally, the push block 4 is hooked onto the externally threaded section A13 at the rear end of the main rod 1. The nut 6 is adjusted to cause different degrees of compression in the spring 7, thereby applying different amounts of tensile stress.

Claims

1. An intervertebral disc elastic stretching stress applying device, characterized by: It includes a main frame mechanism and a stress applying mechanism; the main frame mechanism includes two parallel main rods and two parallel Kirschner wires; the Kirschner wires and the main rods are arranged perpendicular to each other; The two ends of one of the Kirschner wires pass through the connecting block A which is slidably connected to the middle part of the main rod to achieve relative sliding with the main rod, and the two ends of the other Kirschner wire pass through the connecting block B which is threadedly connected to the rear end of the main rod to remain relatively fixed with the main rod; the stress applying mechanism is detachably installed between the connecting block A and the rear end of the main rod, and is used to apply tensile stress that causes the two Kirschner wires to move away from each other.

2. The intervertebral disc elastic stretching stress applying device according to claim 1, characterized in that: the main rod A polished rod section is provided in the middle front part, and an enlarged diameter end head and an external threaded section A are respectively provided at the front and rear ends of the polished rod section, and a positioning surface is provided between the enlarged diameter end head and the polished rod section; a pinhole A, a rod hole A and a first locking hole are provided on the connecting block A; the pinhole A and the rod hole A are arranged vertically in a cross shape and are not interconnected, and the first locking hole is a smooth hole, and the first locking hole passes through the outer surface of the connecting block A to the pinhole A; the connecting block A is slidably installed on the polished rod section or the external threaded section A of the main rod through the rod hole A; the two connecting blocks A have the same installation position on the two main rods, so that the pinhole holes A of the two connecting blocks A are arranged facing each other; a pinhole B and a screw-in hole are provided on the connecting block B; the pinhole B and the screw-in hole are arranged vertically in a cross shape and are not interconnected; the connecting block B is threadedly connected to the external threaded section A of the main rod through the screw-in hole; the connection positions of the two connecting blocks B on the two main rods are the same, so that the pinhole holes B of the two connecting blocks B are arranged facing each other.

3. The intervertebral disc elastic stretching stress applying device according to claim 2, characterized in that: One of them The two ends of the Kirschner wire are respectively passed through the needle holes A of the two connecting blocks A and installed on the two connecting blocks A. The two connecting blocks A are respectively slidably connected to the plain rod sections or external threaded sections A of the two main rods through the rod holes A; the two connecting blocks B are respectively threadedly connected to the external threaded sections A of the two main rods through the screw-in holes, and the two ends of another Kirschner wire are respectively passed through the needle holes B of the two connecting blocks B and installed on the two connecting blocks B.

4. The intervertebral disc elastic stretching stress applying device according to claim 3, characterized in that: There are two sets of stress applying mechanisms. The first set of stress applying mechanisms is arranged between the rear end of one of the main rods and the connecting block A installed thereon. The second set of stress applying mechanisms is arranged between the rear end of the other main rod and the connecting block A installed thereon. The two sets of stress applying mechanisms are arranged symmetrically.

5. The intervertebral disc elastic stretching stress applying device according to claim 4, characterized in that: The applying mechanism includes a push block, a secondary rod, a nut and a spring; a sliding hole and a hook arc are provided on the push block, and the push block is hooked on the external threaded section A at the rear end of the main rod through the hook arc; the front middle and rear ends of the secondary rod are respectively provided with an external threaded section B and a connecting end head, and the connecting end head is provided with a through threaded through hole, and the connecting end head at the rear end of the secondary rod is placed on the connecting block A, and the threaded through hole of the secondary rod is arranged opposite to the first locking hole of the connecting block A, and then the rotational connection between the secondary rod and the connecting block A and the relative fixation of the Kirschner wire and the connecting block A are achieved by screwing into the threaded through hole and passing through the first locking hole. The external threaded section B at the front end of the secondary rod can move through the sliding hole of the push block; the nut is threadedly connected to the external threaded section B of the secondary rod and is located between the push block and the connecting end head of the secondary rod; The spring is sleeved on the secondary rod and is compressed and arranged between the push block and the nut.

6. The intervertebral disc elastic stretching stress applying device according to claim 5, characterized in that: When the push block is hooked on the external threaded section A at the rear end of the main rod, the spring forces the rear end surface of the push block to press against the connecting block B through elastic force, thereby causing the two Kirschner wires to move away from each other, thereby applying tensile stress.

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