Elastic force adjustable kirschner wire stress applying mechanism

Abstract

An elastic force adjustable kirschner wire stress applying mechanism comprises a main body frame assembly and a stress applying assembly. The main frame assembly comprises a main rod and a kirschner wire which are perpendicular to each other, and the kirschner wire penetrates through a connecting block A connected to the middle of the main rod in a sliding mode and slides relative to the main rod. The stress applying assembly is detachably installed between the front end of the main rod and the connecting block A and used for applying stress parallel to the main rod to the kirschner wire. As an important component of the intervertebral disc elastic compression stress applying device, the adjustable stress can be applied to the kirschner wire. The intervertebral disc elastic compression stress applying device is applied to the lumbar vertebra of a large animal, adjustable compression stress can be provided for the intervertebral disc, then change data of the intervertebral disc under the action of different compression stress is obtained, and a theoretical basis is provided 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 elastically adjustable Kirschner wire stress applying mechanism. Background Art

[0002] Lumbar disc herniation causing lower back and leg pain is a common and frequently occurring disease. When sitting, the lumbar disc is easily squeezed for a long time, resulting in abnormal compression stress, leading to disc lesions, which in turn compress the nerves and cause 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.

[0004] In the special experimental device, how to achieve stress application to the Kirschner wire and how to achieve the adjustability of the applied stress are key issues that need to be addressed. Utility Model Content

[0005] The purpose of the present utility model is to overcome the deficiencies of the prior art and to provide an elastically adjustable Kirschner wire stress applying mechanism. As an important component of the intervertebral disc elastic compressive stress applying device, the elastic compressive stress applying device for the intervertebral disc realizes the application of adjustable stress to the Kirschner wire. The intervertebral disc elastic compressive stress applying device is applied to the lumbar vertebrae of large animals, and can provide adjustable compressive stress to the intervertebral disc, thereby obtaining change data of the intervertebral disc under different compressive stresses, and providing a theoretical basis for the prevention and treatment of human intervertebral disc degeneration diseases.

[0006] The technical solution of the utility model is: an elastically adjustable Kirschner wire stress applying mechanism, comprising a main frame assembly and a stress applying assembly; the main frame assembly comprises a main rod and a Kirschner wire arranged perpendicular to each other, the Kirschner wire passes through a connecting block A slidably connected to the middle of the main rod and slides relative to the main rod; the stress applying assembly is detachably mounted between the front end of the main rod and the connecting block A, and is used to apply stress to the Kirschner wire in a direction parallel to the main rod and pointing to the rear end of the main rod.

[0007] A further technical solution of the present 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 polished hole, and the first locking hole passes through the outer surface of the connecting block A to the pinhole hole 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, and the Kirschner wire is installed on the connecting block A through the pinhole hole A.

[0008] 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 smooth rod section at the front 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 screwed into the threaded through hole and penetrated into the first The locking screw in the locking hole realizes the rotational connection between the auxiliary rod and the connecting block A and the relative fixation of the Kirschner wire and the connecting block A. The external threaded section B at the front end of the auxiliary rod moves through the sliding hole of the push block; the nut is threadedly connected to the external threaded section B of the auxiliary rod and is located between the push block and the connecting end of the auxiliary rod; the spring is sleeved on the auxiliary rod and compressed between the push block and the nut. The spring forces the front end face of the push block to collide with the positioning surface of the main rod through elastic force, and then applies stress to the connecting block A and the Kirschner wire in a direction parallel to the main rod and pointing to the rear end of the main rod.

[0009] Compared with the prior art, the present invention has the following advantages:

[0010] As a key component of the intervertebral disc elastic compressive stress application device, it enables adjustable stress application to the Kirschner wire. Applied to the lumbar spine of large animals, the intervertebral disc elastic compressive stress application device can provide adjustable compressive stress to the intervertebral disc, thereby obtaining data on disc changes under varying compressive stresses, providing a theoretical basis for the prevention and treatment of intervertebral disc degeneration in humans.

[0011] The present invention will be further described below with reference to the drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of the utility model;

[0013] Figure 2 The structural diagram of the main rod;

[0014] Figure 3 It is a structural diagram of the connection block A;

[0015] Figure 4 It is the structural diagram of the auxiliary rod;

[0016] Figure 5 It is a structural diagram of the push block;

[0017] Figure 6 This is a schematic structural diagram of the intervertebral disc elastic compression stress applying device to which the present utility model is applied;

[0018] Figure 7 It is a structural diagram of connection block B.

[0019] 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; locking screw 100. DETAILED DESCRIPTION Example 1

[0020] like Figure 1-5 As shown, the elastically adjustable Kirschner wire stress applying mechanism includes a main frame component and a stress applying component.

[0021] The main frame assembly includes a main rod 1 and a Kirschner wire 2 arranged perpendicular to each other. The Kirschner wire 2 slides relative to the main rod 1 through a connecting block A31 that is slidably connected to the middle part of the main rod 1. A smooth rod section 11 is provided in the front part of the main rod 1. The front and rear ends of the smooth rod section 11 are respectively provided with an enlarged diameter end 12 and an external threaded section A13. A positioning surface is provided between the enlarged diameter end 12 and the smooth rod section 11. A needle hole A311, a rod hole A312 and a first locking hole 313 are provided on the connecting block A31. The needle hole A311 and the rod hole A311 are arranged vertically in a cross shape and are not connected to each other. The first locking hole 313 is a smooth hole. The first locking hole 313 passes through the outer surface of the connecting block A31 to the needle hole A311. The connecting block A31 is slidably mounted on the polished rod section 11 or the external threaded section A13 of the main rod 1 through the rod penetration hole A312, and the Kirschner wire 2 is mounted on the connecting block A31 through the needle penetration hole A311.

[0022] The stress-applying assembly is removably mounted between the front end of the main rod 1 and the connecting block A31. It applies stress to the K-wire 2, parallel to the main rod 1 and directed toward the rear end. The stress-applying mechanism comprises a pusher block 4, a secondary rod 5, a nut 6, and a spring 7. The pusher block 4 is provided with a screw-in hole 41 and a hook 42, which hooks the pusher block 4 to the polished rod section 11 at the front end of the main rod 1. The auxiliary rod 5 is provided with an externally threaded section B51 and a connecting end 52 at the front middle and rear ends, respectively. The connecting end 52 is provided with a threaded through-hole 521. The connecting end 52 at the rear end of the auxiliary rod 5 is placed on the connecting block A31, and the threaded through-hole 521 of the auxiliary rod 5 is arranged to be aligned with the first locking hole 313 of the connecting block A31. The locking screw 100 is screwed into the threaded through-hole 521 and inserted into the first locking hole 313 to achieve the rotational connection between the auxiliary rod 5 and the connecting block A31, and the relative fixation of the K-wire 2 and the connecting block A31. The externally threaded section B51 at the front end of the auxiliary rod 5 can be moved through the screw-in hole 41 of the push block 4. The nut 6 is threadedly connected to the externally threaded 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. The spring 7 forces the front end face of the push block 4 to collide with the positioning surface of the main rod 1 through elastic force, thereby applying stress to the connecting block A31 and the Kirschner wire 2 in a direction parallel to the main rod 1 and pointing to the rear end of the main rod 1.

[0023] The above-mentioned elastic force adjustable Kirschner wire stress applying mechanism is applied to the intervertebral disc elastic compression stress applying device. The structure of the intervertebral disc elastic compression stress applying device is described in detail as follows.

[0024] like Figure 2-7 As shown, the intervertebral disc elastic compression stress applying device includes a main frame mechanism and a stress applying component.

[0025] 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.

[0026] 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.

[0027] The stress-applying assembly is removably mounted between the connecting block A31 and the front end of the main rod 1, applying compressive stress that forces the two K-wires 2 to move closer together. Two sets of stress-applying assemblies are provided: the first set is located between the front end of one main rod 1 and the connecting block A31 mounted thereon, and the second set is located between the front end of the other main rod 1 and the connecting block A31 mounted thereon. The two sets of stress-applying assemblies are arranged symmetrically.

[0028] The stress applying assembly includes a push block 4, a secondary rod 5, a nut 6 and a spring 7. The push block 4 is provided with a screw-in hole 41 and a hook arc 42, and the push block 4 is hooked on the smooth rod section 11 at the front 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 threaded section 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 opposite to 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 threaded section B51 at the front end of the secondary rod 5 can move through the screw-in hole 41 of the push block 4. The nut 6 is threadedly connected to the external threaded 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. The spring 7 uses its elastic force to force the front end surface of the push block 4 to abut against the positioning surface of the main rod 1, thereby causing the two K-wires 2 to move closer together and achieve the application of compressive stress.

[0029] The above-mentioned intervertebral disc elastic compressive stress applying device can realize the application of elastic compressive stress. Before applying the elastic compressive stress, the elastic force of the spring under different compression states is measured and recorded for future use.

[0030] The compressive stress is applied as follows:

[0031] Install the two stress-applying assemblies between the front ends of the two main rods 1 and the connecting block A31 connected to the respective main rods 1, ensuring that the two stress-applying assemblies are symmetrically arranged. In this state, the push block 4 is hooked to the polished rod section 11 at the front end of the main rod 1 via the hook arc 42. The compression level of the springs 7 in the two stress-applying assemblies is always consistent, ensuring that the elastic force applied to the ends of the K-wire 2 is always consistent.

[0032] By synchronously rotating and adjusting the nuts 6 in the two sets of stress-applying assemblies, the compression degree of the springs 7 in the two sets of stress-applying assemblies is synchronously changed, achieving the application of different amounts of compressive stress. The elastic force of the spring 7 acts on the push block 4 and presses the push block 4 against the positioning surface of the main rod 1. Through the transmission of force, the two connecting blocks A31 and the Kirschner wire 2 passing through the two connecting blocks A31 tend to move toward the other Kirschner wire 2, achieving the application of compressive 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 compressive stress value. The greater the degree of compression of the spring 7, the greater the compressive stress applied to the Kirschner wire 2, and the smaller the degree of compression of the spring 7, the smaller the compressive stress applied to the Kirschner wire 2.

[0033] The above-mentioned intervertebral disc elastic compressive stress applying device is applied to the lumbar vertebrae of large animals and can provide adjustable compressive stress to the intervertebral disc. The specific operation process is as follows.

[0034] 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.

[0035] When compressive stress is required, the first set of stress-applying mechanisms is positioned between the front 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 front 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 smooth rod section 11 at the front end of the main rod 1. The nut 6 is adjusted to cause the spring 7 to produce varying degrees of compression, thereby applying varying amounts of compressive stress.

Claims

1. Elastic adjustable Kirschner wire stress applying mechanism, characterized by: It includes a main frame assembly and a stress applying assembly; the main frame assembly includes a main rod and a Kirschner wire arranged perpendicular to each other, and the Kirschner wire passes through a connecting block A that is slidably connected to the middle of the main rod and slides relative to the main rod; the stress applying assembly can be detachably installed between the front end of the main rod and the connecting block A, and is used to apply stress to the Kirschner wire in a direction parallel to the main rod and pointing to the rear end of the main rod.

2. The elastic force adjustable Kirschner wire stress applying mechanism 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 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 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 connected to each other, the first locking hole is a polished hole, and the first locking hole passes through the outer surface of the connecting block A to the pinhole hole 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, and the Kirschner wire is installed on the connecting block A through the pinhole hole A.

3. The elastic force adjustable Kirschner wire stress applying mechanism according to claim 2, 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 smooth rod section at the front 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 compressed between the push block and the nut. The spring forces the front end face of the push block to collide with the positioning surface of the main rod through elastic force, thereby applying stress to the connecting block A and the Kirschner wire in a direction parallel to the main rod and pointing to the rear end of the main rod.

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