A small animal lamina stripper

Abstract

A small animal lamina stripper includes a first pliers head, a second pliers head, a first pliers handle, a second pliers handle, a first locking piece, a second locking piece, and a supporting spring. The first pliers head is a columnar structure. The top of the inner surface of the first pliers head is a nail tooth. The bottom of the nail tooth is connected to a groove. The bottom of the groove is connected to a first clamping surface. The second pliers head is a flat structure, which is shorter than the first pliers head. The top of the inner surface of the second pliers head is a protrusion. The bottom of the protrusion is connected to the second clamping surface of the second pliers head. The second clamping surface is connected to the bottom pliers of the second pliers head. There is an angle of 10°-30° between the bottom pliers and the second clamping surface, which is conducive to the second pliers head extending from the gap between the lamina and the spinal cord. The small animal lamina stripper of the present invention is simple and quick to operate, is not easy to damage the spinal cord in the spinal canal, and the wound is neat and uniform, which improves the consistency of modeling.

Description

Technical Field

[0001] The invention relates to the technical field of animal experiments, in particular to a small animal lamina stripper. Background Art

[0002] Establishing mammalian models to simulate the development of diseases is an important means to evaluate the effectiveness of treatment strategies and gain a deeper understanding of the pathogenesis. Rat (mouse) spinal cord pathology models are one of the most common animal models. Figure 4 As shown, the spinal canal 18 includes a vertebral plate 16, a vertebral body 19 and an intervertebral disc 20. The spinal cord is in the middle of the spinal canal 18. The vertebral plate 16 is a type of irregular bone plate tissue, connecting the vertebral arch, vertebral body 19 (the intervertebral disc 20 is between the upper and lower vertebral bodies), the anterior and posterior articular processes, the transverse processes and the spinous processes 17, and is an important component of the posterior column of the spine. Since the vertebral plate needs to be peeled off in most cases during the modeling process, the particularity of its structure requires great care during the peeling process, otherwise it is easy to cause spinal cord injury in the spinal canal and damage to the surrounding adjacent bone structures.

[0003] At present, laminectomy in animal experiments often relies on conventional small surgical instruments such as micro needle holders, micro straight forceps, micro tweezers, etc., and the experimenters often choose according to their personal habits. Due to the lack of instruments suitable for laminectomy, the size and function of the instruments are often mismatched, the modeling surgical methods are different, and the degree of animal injury is inconsistent, which makes the model uniformity poor and reduces the reliability of the experiment. There is no special small animal laminectomy instrument designed for spinal structure and a unified laminectomy method in the published patents. Summary of the invention

[0004] The present invention aims to solve the deficiencies of the prior art and provides a small animal lamina stripper which is simple and quick to operate, is not prone to damaging the spinal cord in the spinal canal, has a neat and uniform wound, and improves the consistency of modeling.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A small animal vertebral plate stripper, comprising a pliers head and a pliers handle that drives the pliers head to clamp, the pliers head comprising a first pliers head and a second pliers head corresponding to the first pliers head, the pliers handle comprising a first pliers handle connected to the first pliers head and a second pliers handle connected to the second pliers head and hinged to the first pliers handle through a pin shaft, the front end of the first pliers head extending in the length direction of the pliers head to form a prying plate, so that the length of the first pliers head is longer than that of the second pliers head, the end of the prying plate facing the second pliers head is provided with nail teeth for fixing, the second pliers head is a flat structure that is convenient for insertion into the gap between the vertebral plate and the spinal cord, the flat structure is preferably a rectangle with a thickness of 1-3mm, when stripping mice, the second pliers head with a thickness of 1-1.5mm is preferred, and when stripping rats, the second pliers head with a thickness of 2-3mm is preferred, the first pliers handle and the second pliers handle are provided with a locking device that fixes the first pliers head and the second pliers head in a occluded state and can release the occluded state, and an elastic return device that opens the first pliers head and the second pliers head after the occluded state is released to an open state.

[0007] After confirming the stripping of the vertebral plate, the spinous process part on the vertebral plate is removed, and the nail teeth on the first pliers head are fixed on the remaining spinous process, and the second pliers head is used to extend into the gap between the vertebral plate and the spinal cord, and then the first pliers head and the second pliers head are engaged through the pliers handle, and the engaged state is locked by the locking device, and the nail teeth on the pry plate of the first pliers head are used as a fulcrum, and the pliers handle is used as a prying point, so as to pry the vertebral plate away from the vertebral canal as a whole. If the vertebral plate is hard, only part of the vertebral plate can be pried away from the vertebral canal, and the whole vertebral plate can be pried away multiple times.

[0008] Furthermore, the front end of the second clamp head is a smooth cambered surface, which can prevent the second clamp head from damaging the spinal cord in the spinal canal when it extends into the gap between the vertebral plate and the spinal cord.

[0009] Furthermore, a protrusion facing the protrusion of the first clamp head is provided at the end of the second clamp head along the width direction of the second clamp head, and a groove corresponding to the protrusion is provided on the first clamp head.

[0010] Furthermore, the locking device includes a first locking piece arranged on the first clamp handle and a second locking piece arranged on the second clamp handle and corresponding to the position of the first locking piece.

[0011] Furthermore, the elastic return device includes a supporting spring sheet arranged between the first clamp handle and the second clamp handle.

[0012] Furthermore, the opposing surfaces of the first and second clamp heads are first clamping surfaces, the first clamping surfaces are provided with anti-slip grooves, the opposing surfaces of the second and first clamp heads are second clamping surfaces, and the inner surface of the second clamping surfaces are provided with anti-slip grooves.

[0013] Furthermore, the groove engages with the protrusion when the first clamping surface and the second clamping surface are in contact.

[0014] Furthermore, an angle is set between the second forceps head and the second forceps handle, which is conducive to the insertion of the second forceps head into the gap between the vertebral plate and the spinal cord.

[0015] Furthermore, the included angle between the extension line of the second pliers head and the second pliers handle is 10-30°.

[0016] Due to the adoption of the above structure, the present invention is designed for the vertebral lamina structure of the spine of small animals. The nail teeth at the top of the first pliers head can be well fixed to the base of the spinous process after biting off, and the vertebral lamina can be further opened using the lever principle. The flat design of the second pliers head and the angle formed between the body and the bottom of the second pliers head make it easy to extend into the gap between the vertebral lamina and the spinal cord. The anti-slip pattern design on the inner surface of the pliers head can prevent slipping during use. The design of the second pliers head being shorter than the first pliers head allows the stripper to avoid damaging the spinal cord in the spinal canal to the greatest extent during the process of lifting the vertebral lamina. The locking structure can keep the stripper in a closed state, which can increase the bite force and can be used to bite off the spinous process and to destroy the vertebral lamina when the bone is hard. The operation is simple and quick, it is not easy to damage the spinal cord in the spinal canal, and the wound is neat and uniform, which improves the consistency of modeling. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a stereogram of the present invention.

[0018] Figure 2 It is a partial view of the clamp head of the present invention.

[0019] Figure 3 It is a cross-sectional structural diagram of the clamp head of the present invention.

[0020] Figure 4 A state diagram is used for the present invention.

[0021] In the accompanying drawings, 1, the first clamp head, 2, the second clamp head, 3, the pin, 4, the second clamp handle, 5, the first clamp handle, 6, the second locking plate, 7, the first locking plate, 8, the supporting spring piece, 10, the nail teeth, 11, the groove, 12, the first clamping surface, 13, the anti-slip pattern, 14, the protrusion, 15, the second clamping surface, 16, the vertebral plate, 17, the spinous process, 18, the vertebral canal, 19, the vertebral body, 20, the intervertebral disc. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0023] like Figure 1As shown, a small animal vertebral plate stripper comprises a first pliers head 1, a second pliers head 2, a first pliers handle 5, a second pliers handle 4, a first locking piece 7, a second locking piece 6, and a supporting spring piece 8. The first pliers head 1 is hinged to the second pliers head 2 through a pin shaft 3. The first pliers head 1 is fixedly connected to the first pliers handle 5 at the bottom, and the second pliers head 2 is fixedly connected to the second pliers handle 4 at the bottom. The outer surfaces of the first pliers handle 5 and the second pliers handle 4 are provided with anti-slip patterns. The inner surface of the first pliers handle 5 is provided with a first locking piece 7, and the inner surface of the second pliers handle 4 is provided with a second locking piece 6. The first locking piece 7 can be combined with the second locking piece 6 and fastened, so that the stripper is in a pliers head biting state. The first pliers handle 5 and the second pliers handle 4 are fixedly connected to the supporting spring piece 8 at the bottom, so that the pliers head is in an open state when the first locking piece 7 and the second locking piece 6 are released from the locked state.

[0024] Figure 2 , 3 The figure shows a partial detail of the clamp head. The first clamp head 1 is a columnar structure with good strength and holding force. The front end of the first clamp head 1 extends in the length direction of the clamp head to form a prying plate, so that the length of the first clamp head 1 is longer than that of the second clamp head 2. The end of the prying plate is provided with nail teeth 10 for fixing on the side facing the second clamp head. The opposing surfaces of the first clamp head 1 and the second clamp head 2 are respectively the first clamping surface 12 and the second clamping surface 15. The opposing surfaces of the first clamping surface 12 and the second clamping surface 15 are provided with anti-slip grooves 13. The second clamp head 2 is a flat structure suitable for extending into the gap between the vertebral plates 16 and the vertebral plates 16. The head end of the second clamp head 2 is a smooth arc surface to avoid damage to the spinal cord when the vertebral plates 16 are peeled off. A protrusion 14 is provided on the second clamping surface 15 of the second pliers 2, and a groove 11 matching the protrusion 14 is provided on the first clamping surface 12 of the first pliers 1, so that the bite force during biting can be increased, and the vertebral lamina of the biting part can be pried away from the overall vertebral lamina when necessary. There is an angle of 10° between the extended surface of the second clamping surface 15 of the second pliers 2 and the second pliers handle, which is conducive to the second pliers 2 extending into the gap between the vertebral lamina and the spinal cord.

[0025] Working principle: This small animal lamina stripper is designed for holding and grasping. When in use, the user holds / grasps the anti-slip pattern area on the outer surface of the first clamp handle 5 and the second clamp handle 4 to prevent the user from slipping. The user can control the opening and closing of the clamp head by opening and closing the fingers. When closing the lamina stripper, the fingers close to combine and fasten the first locking piece 7 and the second locking piece 6, and the groove 11 and the protrusion 14 are matched. When opening the lamina stripper, the fingers are closed again to separate the first locking piece 7 and the second locking piece 6 that are fastened together.

[0026] When performing laminectomy, Figure 4As shown, first hold the stripper, close the pliers, and use the shear force formed by the long side of the second clamping surface 15 and the edge of the first clamping surface 12 to bite off the head and body of the spinous process 17. After exposing the rear edge of the vertebral lamina, grasp the stripper, the second clamping surface 15 of the second pliers 2 partially extends into the spinal canal 18, and the top nail teeth 10 of the first pliers 1 are fixed on the spinous process after biting off. When stripping the vertebral lamina, if the vertebral lamina is thin and easy to open, then use the nail teeth 10 as a fulcrum, close the fingers to clamp the vertebral lamina and then use the lever principle to open the vertebral lamina upwards. If the vertebral lamina is hard and difficult to open, close the vertebral lamina stripper after the second clamping surface 15 of the second pliers 2 partially extends into the spinal canal 18 to bite off the vertebral lamina, and then use the nail teeth 10 as a fulcrum to open the vertebral lamina upwards, and the overall prying of the vertebral lamina is achieved through multiple operations.

[0027] During use, the depth of the second clamping surface 15 extending into the gap between the vertebral plate 16 and the spinal cord can be adjusted according to actual conditions to perform vertebral plate stripping. The operation is simple and quick, and it is not easy to damage the spinal cord in the spinal canal. The wound is neat and uniform, which improves the consistency of modeling.

[0028] The above content schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only several implementation methods of the present invention, and the actual structure is not limited thereto. If a person skilled in the art is inspired by it, without departing from the purpose of the invention, other forms of structure, transmission, installation and connection methods are adopted without creative design. The structural methods and embodiments similar to the technical solution should all fall within the scope of protection of the present invention.

Claims

1. A small animal lamina stripper, comprising a clamp head and a clamp handle for driving the clamp head to clamp, wherein the clamp head comprises a first clamp head (1) and a second clamp head (2) corresponding to the first clamp head (1), characterized in that: The pliers handle comprises a first pliers handle (5) connected to the first pliers head (1) and a second pliers handle (4) connected to the second pliers head (2) and hinged to the first pliers handle (5) through a pin shaft (3); an angle is set between the second pliers head (2) and the second pliers handle (4) to facilitate the second pliers head (2) to be inserted into the gap between the vertebral plate (16) and the spinal cord; the front end of the first pliers head (1) extends in the length direction of the pliers head to form a prying plate, so that the length of the first pliers head (1) is longer than that of the second pliers head (2); the end of the prying plate is provided with nail teeth (10) for fixing on the side facing the second pliers head (2); the second pliers head (2) is a flat structure that is convenient for insertion into the gap between the vertebral plate (16) and the spinal cord; the first pliers handle (5) and the second pliers handle (4) are provided with a locking device for fixing the first pliers head (1) and the second pliers head (2) in a occlusal state, and an elastic return device for opening the first pliers head (1) and the second pliers head (2) to an open state after the locking device is released from the occlusal state; The front end of the second clamp head (2) is a smooth arc surface; the surface where the first clamp head (1) and the second clamp head (2) face each other is a first clamping surface (12), and the first clamping surface (12) is provided with anti-slip grooves (13); the surface where the second clamp head (2) and the first clamp head (1) face each other is a second clamping surface (15), and the inner surface of the second clamping surface (15) is provided with anti-slip grooves (13).

2. The small animal lamina stripper according to claim 1, characterized in that: The locking device comprises a first locking piece (7) arranged on the first clamp handle (5) and a second locking piece (6) arranged on the second clamp handle (4) and corresponding to the position of the first locking piece (7).

3. The small animal lamina stripper according to claim 1, characterized in that: The elastic return device comprises a supporting spring sheet (8) arranged between the first clamp handle (5) and the second clamp handle (4).

4. The small animal lamina stripper according to claim 1, characterized in that: The end of the second clamp head (2) is provided with a protrusion (14) facing the protrusion (14) of the first clamp head (1) along the width direction of the second clamp head (2), and the first clamp head (1) is provided with a groove (11) corresponding to the protrusion (14).

5. The small animal lamina stripper according to claim 4, characterized in that: The groove (11) engages with the protrusion (14) when the first clamping surface (12) and the second clamping surface (15) are in contact.

6. The small animal lamina stripper according to claim 1, characterized in that: The second clamp head (2) is rectangular with a thickness of 1-3 mm.

7. The small animal lamina dissector according to any one of claims 1 to 6, characterized in that: The included angle between the extension line of the second clamp head (2) and the second clamp handle (4) is 10° to 30°.

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