CN218067312U

CN218067312U - Preparation device of burst fracture model

Info

Publication number: CN218067312U
Application number: CN202222161198.4U
Authority: CN
Inventors: 曾煌祥; 杨永迁; 钟镕伟; 吴键; 王云蕾; 叶丹丹
Original assignee: Shanghai Weiwei Zhiling Medical Technology Co ltd; Meizhou Peoples Hospital
Current assignee: Shanghai Weiwei Zhiling Medical Technology Co ltd; Meizhou Peoples Hospital
Priority date: 2022-08-16
Filing date: 2022-08-16
Publication date: 2022-12-16
Anticipated expiration: 2032-08-16

Abstract

The utility model provides a preparation facilities of fracture model bursts, it includes: the device comprises a base, a clamping component, an impact piece, a slide rail and an elastic component; the clamping assembly comprises a first fixing part and a second fixing part which are arranged at intervals along the horizontal direction, and an animal spine vertebral body is clamped and fixed between the first fixing part and the second fixing part; the first fixing part is fixedly arranged on the base, and the second fixing part is movably arranged on the base along the horizontal direction; the sliding rail is arranged along the horizontal direction, one end of the sliding rail is connected with the second fixing part, and the other end of the sliding rail is connected with the base; the impact piece is movably arranged on the slide rail; one end of the elastic component is connected with the impact piece, and the other end of the elastic component is connected with the base; the striking piece is configured to exert striking force on the second fixing part under the driving of the elastic component, so that the second fixing part moves towards the first fixing part. So the configuration, the striking dynamics is controllable, and the recurrence degree is high, and the preparation can be realized through repeated striking many times.

Description

Preparation device of burst fracture model

Technical Field

The utility model relates to a preparation technical field of medical model, in particular to preparation facilities of fracture model bursts.

Background

The vertebral column fracture accounts for about 5% -6% of the whole body fracture, wherein the thoracic and lumbar fractures are most common. In the fracture of the thoracolumbar section, the incidence rate of thoracolumbar explosive fracture is the highest, which accounts for about 64-81%, wherein 54.7% of the thoracolumbar explosive fracture is Denis B-type fracture, nerve function damage is often accompanied after the fracture occurs, the prognosis is poor, and great burden is caused to families and society. At present, no specific operation scheme is available for the Denis B-type fracture, so how to stabilize the fracture and reduce the side injury is a hotspot and difficulty of the current domestic and foreign research.

The existing thoracolumbar spine explosive fracture surgical treatment scheme mainly comprises the following steps: (1) The middle column scheme before reconstruction, namely, the damaged vertebral body is completely removed, and the upper vertebral body and the lower vertebral body of the damaged vertebral body are fixed by intervertebral bone grafting fusion (double-segment fixation); (2) The posterior reconstruction scheme is to fix the upper and lower vertebral bodies of the injured vertebra, and the bone grafting fusion beside the vertebra or the fixation of only two segments without fusion; (3) The upper intervertebral disc of the injured vertebra is cut off and fused with the intervertebral in parallel, and the injured vertebra and the upper vertebral body of the injured vertebra are fixed by single segments. However, denis B type thoracolumbar spine fracture has its own characteristics, i.e., the destruction of the upper endplate of the vertebral body, the compression and the backward protrusion of the upper part of the vertebral body, and the integrity of the lower endplate and the lower intervertebral disc. Because of the strong internal fixation and loss of one normally active segment, the adjacent segment degeneration is increased, and therefore, no matter what kind of the above-mentioned techniques are selected, the desired therapeutic effect cannot be obtained. No matter what fixing mode is selected, no experiment indicates the biomechanical stability. At present, no matter research on a biomechanical generation mechanism of thoracolumbar vertebral bursting fracture or research on a novel internal fixation material of thoracolumbar vertebral bursting fracture, a model of the thoracolumbar vertebral bursting fracture needs to be constructed, and therefore, a biomechanical experiment should be developed aiming at a new operation mode to clearly determine the mechanical effect of the thoracolumbar vertebral bursting fracture.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a preparation facilities of fracture model bursts to solve the difficult problem of preparation of the current biological model of fracture that bursts.

In order to solve the technical problem, the utility model provides a preparation facilities of fracture model bursts, it includes: the device comprises a base, a clamping component, an impact piece, a slide rail and an elastic component;

the clamping assembly comprises a first fixing part and a second fixing part which are arranged at intervals along the horizontal direction, and an animal spine vertebral body is clamped and fixed between the first fixing part and the second fixing part;

the first fixing part is fixedly arranged on the base, and the second fixing part is movably arranged on the base along the horizontal direction;

the slide rail is arranged along the horizontal direction, one end of the slide rail is connected with the second fixing part, and the other end of the slide rail is connected with the base;

the impact piece is movably arranged on the slide rail;

one end of the elastic component is connected with the impact piece, and the other end of the elastic component is connected with the base;

the striking piece is configured to exert striking force on the second fixing part under the driving of the elastic component, so that the second fixing part moves towards the first fixing part.

Optionally, in the preparation device for the burst fracture model, the second fixing portion includes a cushion block and an impact block, and the cushion block is detachably connected to the impact block; the impact block is connected with the sliding rail, and the cushion block is located on one side, close to the first fixing portion, of the impact block.

Optionally, in the device for preparing the burst fracture model, an included angle between one surface of the cushion block close to the first fixing portion and the vertical direction is between 2 ° and 15 °.

Optionally, in the preparation device for the burst fracture model, the position of the slide rail along the vertical direction is adjustable.

Optionally, the preparation device of the burst fracture model further comprises a first vertical adjusting piece arranged along the vertical direction; the first vertical adjusting piece is rotatably arranged on the second fixing part around the axis of the first vertical adjusting piece; the first vertical adjusting piece is in threaded connection with the sliding rail, and the position of the sliding rail in the vertical direction is adjusted through rotation of the first vertical adjusting piece.

Optionally, the preparation device of the burst fracture model further comprises a slide rail positioning block and a second vertical adjusting piece arranged in the vertical direction; the second vertical adjusting piece is rotatably arranged on the base around the axis of the second vertical adjusting piece; the second vertical adjusting piece is in threaded connection with the slide rail positioning block, and the second vertical adjusting piece adjusts the position of the slide rail positioning block along the vertical direction through rotation; the slide rail locating block is provided with a slide rail penetrating hole which is communicated along the horizontal direction, and the slide rail is movably penetrated and arranged along the horizontal direction through the slide rail penetrating hole.

Optionally, the device for preparing the burst fracture model further comprises a locking piece, the slide rail positioning block is provided with a locking hole communicated with the slide rail through hole, the locking piece can movably penetrate through the locking hole, and the locking piece is used for locking the slide rail.

Optionally, in the preparation apparatus for a burst fracture model, the locking member is rotatable around its axis, the locking member is connected with the locking hole through a thread, and the locking member is used for abutting against the slide rail to lock the position of the slide rail in the slide rail through hole.

Optionally, in the preparation device for the burst fracture model, one end of the elastic component is connected with one end of the impact piece facing the second fixing part after the extending direction of the elastic component is changed by a pulley; the other end of the elastic component is fixedly connected with the base.

Optionally, in the preparation device for the burst fracture model, the slide rail is provided with a scale.

To sum up, the utility model provides a preparation facilities of fracture model bursts includes: the device comprises a base, a clamping component, an impact piece, a slide rail and an elastic component; the clamping assembly comprises a first fixing part and a second fixing part which are arranged at intervals along the horizontal direction, and an animal spine vertebral body is clamped and fixed between the first fixing part and the second fixing part; the first fixing part is fixedly arranged on the base, and the second fixing part is movably arranged on the base along the horizontal direction; the slide rail is arranged along the horizontal direction, one end of the slide rail is connected with the second fixing part, and the other end of the slide rail is connected with the base; the striking piece is movably arranged on the sliding rail; one end of the elastic component is connected with the striking piece, and the other end of the elastic component is connected with the base; the striking piece is configured to exert striking force to the second fixing part under the drive of the elastic component, so that the second fixing part moves towards the first fixing part.

So configured, the clamping assembly can reliably clamp the spine vertebral body of the animal, and then the impact piece is adopted to impact to construct the burst fracture model. The elastic component is adopted to drive the impact piece to apply the impact force, the impact force is controllable, the recurrence degree is high, the preparation of the burst fracture model can be realized through repeated impact for many times, the elastic component can be applied to the research of a biomechanical generation mechanism of burst fracture, and is used for verifying various application scenes such as an improved operation formula of a thoracolumbar spine burst fracture operation, the reference is provided for the establishment of a new operation formula, and the basis of biomechanical testing is provided for the research of a novel fracture internal fixation instrument in the future.

Drawings

Those skilled in the art will appreciate that the drawings are provided for a better understanding of the invention and do not constitute any limitation on the scope of the invention. Wherein:

FIG. 1 is a schematic view of a device for preparing a model of a burst fracture according to an embodiment of the present invention;

fig. 2 is a schematic view of a second fixing portion and a first vertical adjusting member according to an embodiment of the present invention;

fig. 3 is a schematic view of a slide rail positioning block and a second vertical adjusting member according to an embodiment of the present invention.

In the drawings:

1-a base; 2-a clamping assembly; 21-a first fixed part; 22-a second fixed part; 221-cushion blocks; 222-a strike block; 3-a striker; 4-a slide rail; 41-a first threaded hole; 5-an elastic component; 51-a pulley; 6-animal vertebral body; 71-a first vertical adjustment; 711-first hand-screw nut; 712-a first screw; 72-a stop; 81-a slide rail positioning block; 811-a slide rail is provided with a hole; 812-a second threaded hole; 813-locking holes; 82-a second vertical adjustment; 821-second hand screwing nut; 822-a second screw; 9-locking element.

Detailed Description

To make the objects, advantages and features of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be noted that the drawings are in simplified form and are not to scale, but rather are provided for the purpose of facilitating and distinctly claiming the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently.

As used in this specification, the singular forms "a", "an" and "the" include plural referents, the term "or" is generally employed in its sense including "and/or," the terms "a" and "an" are generally employed in their sense including "at least one," the terms "at least two" are generally employed in their sense including "two or more," and the terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", "third" may explicitly or implicitly include one or at least two of such features, the term "proximal" generally being the end near the operator, the term "distal" generally being the end near the patient, i.e. near the lesion, the terms "end" and "proximal" and "distal" generally referring to the corresponding two parts, which include not only the end points, the terms "mounted", "connected" and "connected" being to be understood in a broad sense, e.g. as being fixedly connected, as well as detachably connected, or as an integral part; either directly or indirectly through intervening media, either internally or in any other relationship. Furthermore, as used in this specification, an element being disposed on another element generally only means that there is a connection, coupling, fit, or drive relationship between the two elements, and the connection, coupling, fit, or drive between the two elements may be direct or indirect through intermediate elements, and should not be understood as indicating or implying any spatial relationship between the two elements, i.e., an element may be in any orientation inside, outside, above, below, or to one side of another element, unless the content clearly dictates otherwise. The term "upper" generally refers to a greater distance from the ground than the term "lower", the term "vertical" should be understood as a direction perpendicular to the ground, the term "horizontal" should be understood as a direction parallel to the ground, and the term "height" should be understood as a distance from the ground in the vertical direction. The specific meanings of the above terms in the present specification can be understood by those of ordinary skill in the art as appropriate.

As the background art shows, in the existing thoracolumbar spine explosive fracture operation treatment scheme, because of the adoption of strong internal fixation and the loss of a normal movable segment, the degeneration of adjacent segments is increased, partial injury awl is difficult to place nails, and the biomechanical stability cannot be met. Many scholars are seeking more reasonable new operation modes, restoring spinal biological force lines through internal fixation and reserving more spinal motion segments. Aiming at the existing thoracolumbar spine burst fracture surgical treatment scheme, the inventor finds that strong internal fixation can cause vertebral body bone mass loss due to stress shielding, increase the significant stress of adjacent segments, accelerate the degeneration of the adjacent segments and cause the function loss of intervertebral discs. The dynamic internal fixation can avoid the problems and obtain better curative effect. Based on the above, the inventor proposes a new technique, namely, the damaged intervertebral disc is kept, the upper gap of the fused damaged vertebral body crosses the damaged vertebral body to fix the upper vertebral body and the lower vertebral body, and the fixing mode can be selected to be dynamic internal fixation. The operation formula for treating the Denis B type vertebral body explosive fracture by gap fusion double-section strong fixation on the posterior injured vertebra is developed clinically, and good curative effect is obtained in the early stage. However, biomechanical testing of this type of immobilization is lacking.

Based on this, please refer to fig. 1, the utility model provides a preparation facilities of burst fracture model, it includes: the device comprises a base 1, a clamping component 2, an impact piece 3, a slide rail 4 and an elastic component 5; the clamping component 2 comprises a first fixing part 21 and a second fixing part 22 which are arranged at intervals along the horizontal direction, and the first fixing part 21 and the second fixing part 22 are used for clamping and fixing the spine vertebral body 6 of the animal; the first fixing part 21 is fixedly arranged on the base 1, and the second fixing part 22 is movably arranged on the base 1 along the horizontal direction; the slide rail 4 is arranged along the horizontal direction, one end of the slide rail 4 is connected with the second fixing part 22, and the other end of the slide rail 4 is connected with the base 1; the striking piece 3 is movably arranged on the slide rail 4; one end of the elastic component 5 is connected with the striking piece 3, and the other end of the elastic component 5 is connected with the base 1; the striking piece 3 is configured to apply a striking force to the second fixing part 22 under the driving of the elastic component 5, so that the second fixing part 22 moves towards the first fixing part 21, thereby achieving the striking to the vertebral body 6 of the spinal column of the animal.

Optionally, one end of the elastic component 5 is connected to one end (left end in fig. 1) of the striking component 3 facing the second fixing portion 22 after the extending direction is changed by the pulley 51; the other end of the elastic component 5 is fixedly connected with the base 1. The pulley 51 may be a fixed pulley, for example, and is fixed to the base 1. In an alternative embodiment, the resilient member 5 may comprise a spring or other member capable of providing a spring force, and a wire or other connecting member. In the example shown in fig. 1, a spring is used as an example of the elastic member 5, a right end of the spring is fixed to the base 1 by a wire, and a left end of the spring is fixedly connected to a left end of the striker 3 by the wire after changing the extending direction via the pulley 51. The springs are preferably arranged in a horizontal direction, so configured that the inner space of the base 1 can be fully utilized. Optionally, the stiffness coefficient of the spring is calibrated or known in advance to facilitate calculation of the impact force.

Further, in an alternative example, the slide rail 4 is an optical axis with a circular cross section, and the axial direction thereof is arranged along the horizontal direction; the striker 3 has an axially extending slide hole adapted to the shape of the slide 4 so that the striker 3 can slide smoothly on the slide 4 but is restricted from displacement in the radial direction of the slide 4. Preferably, the striking element 3 may include a low-friction structure at the sliding rail hole, such as a teflon coating, a graphite metal sleeve, or a ball bearing, which are commonly used in the art and have a low sliding friction coefficient, so as to minimize the frictional resistance between the striking element 3 and the sliding rail 4. Furthermore, the slide rail 4 has a scale, so that an operator can conveniently know the distance of the striking member 3 relative to the second fixing portion 22. It can be understood that the impact force of the striker 3 can be calculated by those skilled in the art according to the prior art through the stiffness coefficient of the elastic member 5, the mass of the striker 3 and the distance of the striker 3 relative to the second fixing portion 22, so that the impact force can be controlled and adjusted.

In use, the resilient member 5 stores elastic potential energy when an operator drives the striker 3 away from the second fixing portion 22. After the impacting part 3 is driven to be away from the second fixing part 22 by a certain distance, when the impacting part 3 is released, the elastic component 5 can release elastic potential energy to drive the impacting part 3 to move towards the second fixing part 22 and impact the second fixing part 22, and then impact force is indirectly applied to the spine vertebral body 6 of the animal. After one impact is finished, an operator can judge whether the animal spine vertebral body 6 is fractured explosively or not by observing or touching, and specific judgment standards can include explosive fracture judgment standards commonly used in the field, such as that a crack is generated on the animal spine vertebral body 6, or that the animal spine vertebral body 6 generates bone friction feeling and abnormal movement during movement. If the criteria for forming a explosive fracture are not met, the striking member 3 is driven further away from the second fixing portion 22 and released, and the striking step is repeated. Specifically, during repeated impacts, the distance of the impact member 3 with respect to the second fixing portion 22 may be gradually increased to gradually increase the impact force.

So the configuration, owing to adopt elastic component 5 drive striking piece 3 to exert the impact, the striking dynamics is controllable, and the recurrence degree is high, and the preparation of the fracture model that bursts can be realized to the striking repeatedly many times. Particularly, as the elastic component 5 is used for driving, the impacting piece 3 can store enough high elastic potential energy on the elastic component 5 within a smaller moving distance by improving the stiffness coefficient of the elastic component 5, the volume of the whole preparation device can be reduced, and the driving, impacting and reproducing efficiency is improved. The preparation device provided by the embodiment can be applied to research on a biomechanical generation mechanism of burst fracture, and various application scenes such as an improved operation formula for verifying thoracolumbar spine burst fracture operation, provides reference for establishing a new operation formula, and provides a foundation for biomechanical testing for the research on novel fracture internal fixation instruments in the future.

Preferably, the resilient members 5 are replaceable, which facilitates adaptation to different animal vertebral bodies 6. For example, if the vertebral body 6 of the animal spine is relatively thick, a relatively high stiffness factor of the resilient member 5 may be selected accordingly.

Optionally, the second fixing portion 22 includes a cushion block 221 and an impact block 222, and the cushion block 221 is detachably connected to the impact block 222; the striking block 222 is connected to the slide rail 4, and the pad 221 is located on a side of the striking block 222 close to the first fixing portion 21 (in fig. 1, the pad 221 is located on a left side of the striking block 222). Head block 221 is removably positionable to facilitate replacement and adjustment of head block 221. In practice, the end face of the animal vertebral body 6 is not always perpendicular to its axial direction, but always has a certain inclination, and by replacing the appropriate spacer 221, the animal vertebral body 6 can be reliably clamped, and the impact force from the impact member 3 can be reliably transmitted to the animal vertebral body 6. Preferably, an angle between one surface (left end surface in fig. 1) of the pad 221 close to the first fixing portion 21 and the vertical direction is between 2 ° and 15 °.

Preferably, the position of the slide rail 4 in the vertical direction is adjustable. It will be appreciated that since the strike member 3 can only move axially along the slide track 4, its striking force against the animal spine vertebral body 6 can be abstracted as being along the axis of the slide track 4. The position of the sliding rail 4 along the vertical direction can be adjusted, which is equivalent to adjusting the point of application of the impact force to the animal spine vertebral body 6, so that an eccentric impact force is formed on the animal spine vertebral body 6, an axial force can be applied to the animal spine vertebral body 6, an eccentric moment is applied to the animal spine vertebral body 6, an eccentric burst fracture model can be manufactured, and the model preparation application scene of burst fracture is enlarged.

Referring to fig. 1 to 3, optionally, the preparation apparatus for the burst fracture model further includes a first vertical adjuster 71 arranged in a vertical direction; the first vertical adjusting piece 71 is rotatably arranged on the second fixing portion 22 around its own axis; the first vertical adjusting piece 71 is in threaded connection with the slide rail 4, and the position of the slide rail 4 in the vertical direction is adjusted by the first vertical adjusting piece 71 through rotation.

As shown in fig. 2, in an alternative example, the first vertical adjusting member 71 includes a first hand nut 711 and a first screw 712, which are fixedly connected, and the first vertical adjusting member 71 is rotatably disposed on the striking block 222 through two limiting members 72. The first vertical adjusting member 71 is limited by the limiting member 72 to move axially and radially relative to the impact block 222 (for example, a circumferential convex ring is disposed on the first screw 712, and a circumferential groove is disposed on the limiting member 72, and the two are engaged with each other to limit the movement, but not to rotate), that is, the first vertical adjusting member 71 can only rotate around its own axis, and does not move up, down, left, and right relative to the impact block 222. Further, the slide rail 4 has a first threaded hole 41 formed through in the radial direction, the first threaded hole 41 has an internal thread adapted to the external thread of the first screw 712, and the first screw 712 is inserted into the first threaded hole 41 of the slide rail 4 and is in threaded connection with the slide rail 4. With such a configuration, an operator can conveniently adjust the vertical position of the first screw 712 by only rotating the first hand nut 711, so as to adjust the impact force application point of the animal vertebral body 6.

Referring to fig. 3 in combination with fig. 1, optionally, the device for preparing the burst fracture model further includes a slide rail positioning block 81 and a second vertical adjusting piece 82 arranged in a vertical direction; the second vertical adjusting piece 82 is rotatably arranged on the base 1 around the axis thereof; the second vertical adjusting piece 82 is in threaded connection with the slide rail positioning block 81, and the second vertical adjusting piece 82 adjusts the position of the slide rail positioning block 81 along the vertical direction through rotation; the slide rail positioning block 81 has a slide rail through hole 811 running through in the horizontal direction, and the slide rail 4 movably penetrates through the slide rail through hole 811 in the horizontal direction. Since the axial lengths (i.e., the lengths in the horizontal direction) of the different animal spinal vertebral bodies 6 are not the same, and the positions of the first fixing portions 21 are fixed, it can be understood that the positions of the second fixing portions 22 need to be adjustable left and right to fit the different length animal spinal vertebral bodies 6. In addition, since the left end of the slide rail 4 is disposed on the second fixing portion 22, the right end of the slide rail 4 needs to be adjustable with respect to the base 1. The sliding rail 4 is movably arranged in the sliding rail through hole 811 along the horizontal direction, so that the restraint between the sliding rail 4 and the base 1 along the horizontal direction is decoupled.

In an alternative example, the second vertical adjuster 82 includes a second hand nut 821 and a second screw 822 which are fixedly connected, and the second vertical adjuster 82 is rotatably disposed on the base 1, but is limited to displacement relative to the base 1 in the axial direction and the radial direction, that is, the second vertical adjuster 82 can only rotate on its axis, and does not move up, down, left and right relative to the base 1. Further, the slide rail positioning block 81 has a second threaded hole 812 penetrating in the vertical direction, the second threaded hole 812 has an internal thread adapted to the external thread of the second screw 822, and the second screw 822 penetrates through the second threaded hole 812 of the slide rail positioning block 81 and is in threaded connection with the slide rail positioning block 81. With such a configuration, the operator can conveniently adjust the vertical position of the slide rail positioning block 81 by only rotating the second hand nut 821. And because the slide rail 4 is movably arranged in the slide rail through hole 811 along the horizontal direction, the vertical position of the slide rail positioning block 81 is adjusted relative to the vertical position of the slide rail 4. With such a configuration, the left and right ends of the slide rail 4 can be synchronously adjusted in cooperation with the first vertical adjusting member 71, so that the slide rail 4 can always extend in the horizontal direction.

Preferably, the preparation device of the burst fracture model further comprises a locking piece 9, the slide rail positioning block 81 is provided with a locking hole 813 communicated with the slide rail through hole 811, the locking piece 9 is movably arranged in the locking hole 813 in a penetrating manner, and the locking piece 9 is used for locking the position of the slide rail 4 in the slide rail through hole 811. In an alternative example, the locking element 9 is rotatable around its axis, the locking element 9 is connected to the locking hole 813 by a screw thread, and the locking element 9 is used for abutting against the sliding rail 4 to lock the sliding rail 4.

After the animal spine vertebral body 6 is installed, the locking piece 9 can fix the sliding rail 4 relative to the base 1, so that the animal spine vertebral body 6 can be reliably fixed with the base 1, and the animal spine vertebral body 6 is prevented from slipping.

Optionally, the device for preparing the burst fracture model further comprises a drilling component (not shown) for drilling a plurality of holes on the animal vertebral body 6; the drilling part comprises a drill bit, the diameter of the drill bit is between 2mm and 5mm, and the effective length of the drill bit is not less than 25mm. The drilling component may be any arrangement commonly used in the art, such as a bone drill, etc. In the example of using the pig thoracolumbar spine specimen as the animal spine vertebral body 6, the post 1/3 of the upper endplate of the lumbar 1 vertebra (L1) and the mid 1/3 of the upper vertebral body of the lumbar 1 vertebra can be drilled for pre-injury treatment. For porcine thoracolumbar spine specimens, the holes drilled preferably range in size from 3mm in diameter and are approximately 25mm deep, penetrating the entire vertebral body. The number of holes, in the range of 30-40, may be approximately 1/3 of the way up the vertebral body. The inventor researches and finds that the L1 vertebral body can better form burst fracture, the number and the area of drilled holes have influence on the preparation success rate, and based on the anatomical structure of the L1 vertebral body and the stress analysis thereof, the holes are drilled in the posterior 1/3 of the L1 vertebral body upper end plate and the superior 1/3 of the L1 vertebral body, and when the number of drilled holes is between 30 and 40, the higher preparation success rate can be obtained. If the holes are drilled too much and too large, the thoracolumbar spine specimen of the pig is easily damaged in the impact process, so that the preparation success rate is reduced. If the number of the drilled holes is too small, the subsequent impact by the impact member 3 is difficult to form a burst fracture, and further increasing the stiffness coefficient of the elastic component 5 will cause the pig breast and lumbar spine specimen to be damaged, thereby reducing the preparation success rate.

Based on the preparation device of the burst fracture model, the preparation method of the burst fracture model comprises the following steps:

step one S1: obtaining an animal spine vertebral body;

step two S2: drilling a plurality of holes in the pretreated animal spinal vertebral body;

step three, S3: pulling the striking piece 3 to move to a preset distance along the direction far away from the second fixing part 22, loosening the striking piece 3, and driving the striking piece to strike the spine vertebral body of the animal by the elastic component 5

Step four S4: judging whether the spine vertebral bodies of the animals form explosive fractures or not;

if the explosive fracture is formed, the preparation of the explosive fracture model is completed;

and if the explosive fracture is not formed, repeating the step three S3, impacting the spine vertebral body of the animal until the explosive fracture is formed on the spine vertebral body of the animal, and finishing the preparation of the explosive fracture model.

In an alternative example, in the step S1, the animal spine vertebral body is a pre-treated animal spine vertebral body. Taking several segment (e.g. T11-L3) spinal specimens of the thoracolumbar segment of a pig as an example of a spinal vertebral body of an animal, the preprocessing step can comprise one or more of the following processing modes:

(1) Muscle tissues of a pig thoracic and lumbar spine specimen are removed, and all connecting structures such as intervertebral discs, facet joints, ligaments and the like are reserved;

(2) The two ends of the pig thoracolumbar spine specimen along the axial direction are respectively embedded by polymethyl methacrylate or false tooth BASE RESIN (II TYPE) water (DENTURE BASE RESIIN TYPE II) and false tooth BASE RESIN (II TYPE) powder (FIBEREDDENTURE BASE RESIN TYPE II), and the upper embedding box and the lower embedding box are respectively parallel to the end plates at the two ends of the specimen so as to keep the pig thoracolumbar spine specimen in a physiological bending state;

(3) The physiological saline is used for sprinkling at any time in the process of treating the thoracic and lumbar spine specimens of the pigs, so that the thoracic and lumbar spine specimens of the pigs are kept moist.

Of course, as can be understood by those skilled in the art, the size and shape of the pig spine vertebral body are similar to those of the human vertebral body, and are easy to obtain and low in price, so that the pig thoracolumbar spine specimen is only an example of the animal spine vertebral body, and is not limited to the animal spine vertebral body. In addition, animal backbone centrum is also not limited to for chest waist section (T11 ~ L3), and other sections of animal backbone centrum such as chest lumbar vertebrae also can be applied to the method that this embodiment provided, the utility model discloses do not limit to this.

Further, in step two S2, the plurality of holes are located in the upper 1/3 area and the upper endplate area of the vertebral body of the animal spine. Optionally, the pores satisfy at least one of the following conditions:

(1) The aperture range of the holes is 2 mm-5 mm;

(2) The aperture extends through the vertebral body of the animal's spine; and

(3) The number of said holes ranges between 30 and 40.

Of course, the hole can meet all three conditions, and the hole is configured to enable the pre-damage to the vertebral body of the spine of the animal to be more expected and improve the success rate of the subsequent preparation of the burst fracture model.

In step S3, the mass of the striking member 3, the predetermined distance of movement of the striking member 3, and the parameters (such as stiffness) of the resilient member 5 may be set differently according to the selected vertebral body of the spine of the animal.

To sum up, the utility model provides a preparation facilities of fracture model bursts includes: the device comprises a base, a clamping component, an impact piece, a slide rail and an elastic component; the clamping assembly comprises a first fixing part and a second fixing part which are arranged at intervals along the horizontal direction, and an animal spine vertebral body is clamped and fixed between the first fixing part and the second fixing part; the first fixing part is fixedly arranged on the base, and the second fixing part is movably arranged on the base along the horizontal direction; the slide rail is arranged along the horizontal direction, one end of the slide rail is connected with the second fixing part, and the other end of the slide rail is connected with the base; the impact piece is movably arranged on the slide rail; one end of the elastic component is connected with the impact piece, and the other end of the elastic component is connected with the base; the striking piece is configured to exert striking force to the second fixing part under the drive of the elastic component, so that the second fixing part moves towards the first fixing part.

It should be noted that, the above embodiments are not limited to be used alone, and may be combined with each other, which is not limited by the present invention. The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and any modification and modification made by those skilled in the art according to the above disclosure are all within the scope of the claims.

Claims

1. A device for preparing a model of a burst fracture, comprising: the device comprises a base, a clamping component, an impact piece, a slide rail and an elastic component;

the striking piece is movably arranged on the sliding rail;

2. The apparatus for preparing a model of burst fracture according to claim 1, wherein the second fixing portion comprises a cushion block and an impact block, the cushion block being detachably coupled to the impact block; the impact block is connected with the sliding rail, and the cushion block is located on one side, close to the first fixing portion, of the impact block.

3. The apparatus of claim 2, wherein the cushion has an angle of 2 ° to 15 ° with the vertical direction on the side of the cushion adjacent to the first fixing portion.

4. The apparatus for preparing a burst fracture model according to claim 1, wherein the slide rail is adjustable in position in a vertical direction.

5. The apparatus for preparing a burst fracture model according to claim 4, further comprising a first vertical adjustment member arranged in a vertical direction; the first vertical adjusting piece is rotatably arranged on the second fixing part around the axis of the first vertical adjusting piece; the first vertical adjusting piece is in threaded connection with the sliding rail, and the position of the sliding rail along the vertical direction is adjusted through rotation of the first vertical adjusting piece.

6. The apparatus for preparing a burst fracture model according to claim 5, further comprising a slide rail positioning block and a second vertical adjusting member arranged in a vertical direction; the second vertical adjusting piece is rotatably arranged on the base around the axis of the second vertical adjusting piece; the second vertical adjusting piece is in threaded connection with the slide rail positioning block, and the second vertical adjusting piece adjusts the position of the slide rail positioning block along the vertical direction through autorotation; the slide rail locating block is provided with a slide rail penetrating hole which is communicated along the horizontal direction, and the slide rail is movably penetrated and arranged along the horizontal direction through the slide rail penetrating hole.

7. The apparatus for preparing a model of burst fracture as claimed in claim 6, further comprising a locking member, wherein the slide rail positioning block has a locking hole intersecting and communicating with the slide rail through hole, the locking member is movably disposed through the locking hole, and the locking member is used to lock the position of the slide rail in the slide rail through hole.

8. The apparatus of claim 7, wherein the locking member is rotatable about its own axis, the locking member being threadedly coupled to the locking hole, the locking member being adapted to abut the sliding rail to lock the sliding rail.

9. The apparatus for preparing a burst fracture model according to claim 1, wherein one end of the elastic member is connected to one end of the striking member facing the second fixing portion after changing the extending direction by a pulley; the other end of the elastic component is fixedly connected with the base.

10. The apparatus for preparing a burst fracture model as set forth in claim 1, wherein the sliding rail has a scale.