Skeletal muscle injury experimental device

Abstract

A skeletal muscle injury experiment device relates to the technical field of medical experiment equipment and comprises an experiment table, a bracket, a sleeve, a sliding rod, a balancing weight, an experiment piece and a locking piece, the support is fixedly connected to the experiment table, and the sleeve is connected to the support. The two ends of the sliding rod are detachably connected with the balancing weight and the experiment piece. The sleeve is provided with a sleeve cavity; the sliding rod is slidably connected with the sleeve, and at least part of the sliding rod is located in the sleeve cavity; the balancing weight is located outside the cavity of the sleeve. The locking piece is connected with the sleeve and the sliding rod, the locking piece can enable the sliding rod to be locked at the preset height of the sleeve, and the locking piece is configured to be capable of unlocking the sliding rod when being opened, so that the sliding rod moves along the cavity of the sleeve under the action of gravity and drives the experiment piece to downwards abut against or approach the experiment table. The utility model provides a skeletal muscle injury experimental device, which aims to solve the technical problems of complicated operation, poor experimental repeatability and poor stability of experimental results in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of medical experimental equipment technology, and more specifically, to a skeletal muscle injury experimental device. Background Technology

[0002] Skeletal muscle injuries are among the most common types of injuries in various sports. Muscle injuries account for a significant proportion of all sports injuries, especially blunt trauma and strains, with an incidence rate exceeding 90%. Blunt trauma is caused by blunt force directly impacting muscle tissue and is most common in high-intensity contact sports, with the quadriceps and gastrocnemius muscles being the most frequently affected areas. Blunt trauma to skeletal muscle triggers a series of pathological processes, such as muscle fiber rupture, hematoma formation, and inflammatory cell infiltration. These reactions lead to impaired muscle microcirculation and may further cause fibrosis, significantly affecting muscle structure and function. Although muscles possess a certain capacity for self-repair, complete recovery is often difficult to achieve, and long-term damage to motor function or even shortening an athletic career may occur.

[0003] To better understand the pathological mechanisms and repair conditions of skeletal muscle injuries, researchers commonly use animal models to simulate clinical injury scenarios. Current modeling methods primarily focus on blunt trauma, such as using a heavy object to fall onto the target muscle or transmitting impact force through a wedge. However, traditional methods have several drawbacks, including operational complexity, poor experimental repeatability, and unstable experimental results. For example, it's difficult to maintain a perfectly consistent height of the weight, and friction may exist between the wedge and the target muscle; these issues all affect the accuracy of the model and the stability of the experimental results. Utility Model Content

[0004] The purpose of this invention is to provide a skeletal muscle injury experimental device to solve, to a certain extent, the technical problems of complex operation, poor experimental repeatability, and poor stability of experimental results in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An experimental apparatus for skeletal muscle injury includes an experimental table, a support, a sleeve, a sliding rod, a counterweight, an experimental piece, and a locking device;

[0007] The bracket is fixedly connected to the experimental platform, and the sleeve is connected to the bracket; the sleeve is located above the experimental platform, and the bottom of the sleeve can be spaced apart from the experimental platform; the top end of the sliding rod is detachably connected to the counterweight, and the bottom end of the sliding rod is detachably connected to the experimental piece;

[0008] The sleeve has a sleeve chamber that extends axially along the sleeve and is open at both ends; the sliding rod is slidably connected to the sleeve, and at least a portion of the sliding rod is located inside the sleeve chamber; the counterweight is located outside the sleeve chamber and along an axial direction perpendicular to the sleeve, and the cross-sectional area of ​​the counterweight is larger than the cross-sectional area of ​​the opening of the sleeve chamber;

[0009] The locking member is connected to the sleeve and the sliding rod respectively. The locking member can lock the sliding rod at a preset height in the sleeve. The locking member is configured to unlock the sliding rod when it is opened, so that the sliding rod moves along the sleeve cavity under the action of gravity and drives the experimental piece to abut or approach the experimental table.

[0010] In any of the above technical solutions, optionally, along the axial direction of the sleeve, the sleeve is provided with a plurality of locking holes, each of the locking holes penetrating the sleeve;

[0011] Along the axial direction of the sliding rod, the sliding rod is provided with one or more mating holes, each of the mating holes penetrating the sliding rod;

[0012] The locking element passes through the locking hole and the mating hole to lock the sliding rod at a preset height on the sleeve.

[0013] In any of the above technical solutions, optionally, the spacing between any two adjacent locking holes is equal.

[0014] In the plurality of mating holes, the spacing between any two adjacent mating holes is equal;

[0015] The distance between two adjacent locking holes is equal to the distance between two adjacent mating holes;

[0016] The sliding rod is also provided with multiple scale marking grooves; when the locking hole and the mating hole are coaxial, the scale marking grooves are configured to be flush with the top end of the sleeve.

[0017] In any of the above technical solutions, optionally, the number of locking holes is 10, the diameter of the locking holes is 0.5cm, and the distance between two adjacent locking holes is 1cm.

[0018] In any of the above technical solutions, optionally, the length of the sleeve is 15cm-25cm, the distance between the bottom of the sleeve and the experimental table is 8cm-13cm, the outer diameter of the sleeve is 1.8cm-2.5cm, and the inner diameter of the sleeve is 0.8cm-1.8cm.

[0019] The sliding rod has a length of 30cm-50cm, an outer diameter of 0.8cm-1.8cm, and a second threaded hole at the bottom that mates with the experimental piece, the diameter of which is 0.3cm-1cm.

[0020] The sliding rod is made of stainless steel and weighs 200g-300g.

[0021] The bottom of the experimental piece is curved or hemispherical.

[0022] In any of the above technical solutions, optionally, the length of the sleeve is 20cm, the distance between the bottom of the sleeve and the experimental table is 10cm, the outer diameter of the sleeve is 2cm, and the inner diameter of the sleeve is 1.5cm.

[0023] The sliding rod is 40cm long, has an outer diameter of 1cm, and the second threaded hole has a diameter of 0.5cm; the sliding rod has a mass of 240g.

[0024] The bottom of the experimental piece is a hemispherical shape with a diameter of 1 cm.

[0025] In any of the above technical solutions, optionally, the sliding rod and the counterweight are connected by a thread, and the sliding rod and the experimental piece are connected by a thread.

[0026] In any of the above technical solutions, optionally, the bottom of the counterweight block is provided with a counterweight threaded hole that is screwed to the sliding rod, and the top of the counterweight block is provided with a counterweight threaded post that can cooperate with the counterweight threaded hole.

[0027] Alternatively, the bottom of the counterweight block is provided with a counterweight threaded post that is screwed to the sliding rod, and the top of the counterweight block is provided with a counterweight threaded hole that can cooperate with the counterweight threaded post.

[0028] In any of the above technical solutions, optionally, the weight of the counterweight includes one or more of 500g, 750g, 1000g, 1250g, 1500g, 1750g and 2000g;

[0029] The number of experimental pieces is multiple, and the bottom shape of each experimental piece is different.

[0030] Optionally, in any of the above technical solutions, the experimental platform is a metal plate structure;

[0031] The experimental table is provided with a fixing structure; the fixing structure includes binding straps;

[0032] The bottom of the experimental platform is connected to an anti-slip structure;

[0033] The position of the sleeve fixedly connected to the bracket is adjustable.

[0034] The main beneficial effects of this utility model are as follows:

[0035] This invention provides a skeletal muscle injury experimental device, comprising an experimental table, a support, a sleeve, a sliding rod, a counterweight, an experimental piece, and a locking mechanism. By opening the locking mechanism of the sliding rod, the sliding rod is unlocked, allowing it to move along the sleeve chamber under gravity. This causes the experimental piece to press down against or approach the experimental table, striking the target muscle located on the table. For example, a rabbit can be placed on the experimental table, and the experimental piece can strike the rabbit's leg. This skeletal muscle injury experimental device can effectively simulate clinical injury conditions. Its structure is relatively simple, and different injury scenarios can be simulated by changing the counterweight of different masses and the experimental piece of different shapes. The operation is simple, and the device offers advantages such as high experimental repeatability and good stability of experimental results.

[0036] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 A schematic diagram of the skeletal muscle injury experimental device provided in this embodiment of the utility model;

[0039] Figure 2 Another structural schematic diagram of the skeletal muscle injury experimental device provided in an embodiment of this utility model;

[0040] Figure 3 This is an assembly diagram of the sleeve, sliding rod, counterweight, experimental piece, and locking piece provided for an embodiment of the present utility model.

[0041] Icons: 1-Anti-slip structure; 2-Experimental table; 3-Support; 4-Counterweight; 5-Sliding rod; 6-Sleeve; 7-Locking hole; 8-Locking component; 9-Experimental piece; 10-Fixing structure. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0044] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0045] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0046] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0047] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0048] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0049] To better study the pathological mechanisms and repair conditions of skeletal muscle injury, researchers commonly use animal models to simulate clinical injury scenarios. Current modeling methods primarily focus on blunt trauma, such as using a heavy object to strike the target muscle in free fall or transmitting impact force through a wedge. However, traditional methods have several drawbacks, including complex operation, poor experimental reproducibility, and unstable experimental results. Therefore, developing a simple and reproducible device is crucial for optimizing the construction of skeletal muscle injury models. This embodiment provides a skeletal muscle injury experimental device, a striking device for constructing a blunt trauma model of skeletal muscle. It provides precise impact force and a consistent operating procedure, ensuring the reliability and reproducibility of experimental results while reducing human error and resource waste, providing a stable platform for further research on skeletal muscle repair mechanisms.

[0050] This embodiment provides an experimental apparatus for skeletal muscle injury; please refer to... Figures 1-3 , Figure 1 and Figure 2 These are schematic diagrams of two structures of the skeletal muscle injury experimental device provided in this embodiment. Figure 3 This is an assembly diagram of the sleeve, sliding rod, counterweight, experimental piece, and locking piece provided in this embodiment.

[0051] See Figures 1-3 As shown, the skeletal muscle injury experimental apparatus provided in this embodiment includes an experimental table 2, a support 3, a sleeve 6, a sliding rod 5, a counterweight 4, an experimental component 9, and a locking component 8. The experimental table 2 is used to fix the experimental subject, such as a rabbit, cat, or monkey.

[0052] The support 3 is fixedly connected to the experimental platform 2, and the sleeve 6 is connected to the support 3; that is, the support 3 is used to support the sleeve 6; optionally, the sleeve 6 is fixed to the support 3 and perpendicular to the ground so that the sliding rod 5 can move under the action of gravity. In an optional embodiment, the position of the sleeve 6 fixedly connected to the support 3 is adjustable; for example, the sleeve 6 can be detachably and fixedly connected to the support 3.

[0053] The sleeve 6 is located above the experimental platform 2, and the bottom of the sleeve 6 can be spaced apart from the experimental platform 2; the top of the sliding rod 5 can be detachably connected to the counterweight 4; the counterweight 4 can be used to increase the weight of the sliding rod 5; the counterweight 4 and the sliding rod 5 can be detachably connected, and the mass of the counterweight 4 can be adjusted according to experimental needs.

[0054] The bottom end of the sliding rod 5 can be detachably connected to the experimental piece 9; the experimental piece 9 and the sliding rod 5 can be detachably connected, and different models of experimental pieces 9 can be adjusted according to experimental requirements.

[0055] The sleeve 6 has a sleeve chamber that extends axially along the sleeve 6 and is open at both ends; the sliding rod 5 is slidably connected to the sleeve 6, with at least a portion of the sliding rod 5 located within the sleeve chamber; the counterweight 4 is located outside the sleeve chamber and, along an axial direction perpendicular to the sleeve 6, has a cross-sectional area larger than the cross-sectional area of ​​the opening of the sleeve chamber. Optionally, along an axial direction perpendicular to the sleeve 6, the cross-sectional area of ​​the experimental piece 9 may be larger than or smaller than the cross-sectional area of ​​the opening of the sleeve chamber.

[0056] The locking element 8 is connected to the sleeve 6 and the sliding rod 5 respectively. The locking element 8 can lock the sliding rod 5 at a preset height of the sleeve 6. The locking element 8 is configured to unlock the sliding rod 5 when it is opened, so that the sliding rod 5 can move along the sleeve cavity under the action of gravity and drive the experimental piece 9 to touch or approach the experimental table 2.

[0057] The skeletal muscle injury experimental device described in this embodiment includes an experimental table 2, a support 3, a sleeve 6, a sliding rod 5, a counterweight 4, an experimental piece 9, and a locking element 8. By opening the locking element 8 of the locking sliding rod 5, the sliding rod 5 is unlocked, allowing it to move along the sleeve chamber under gravity. This causes the experimental piece 9 to press down against or approach the experimental table 2, so that the experimental piece 9 strikes the target muscle located on the experimental table 2. For example, a rabbit can be placed on the experimental table 2, and the experimental piece 9 can strike the rabbit's leg. This skeletal muscle injury experimental device can effectively simulate clinical injury conditions. Its structure is relatively simple, and different injury conditions can be simulated by changing the counterweight 4 of different masses and the experimental piece 9 of different shapes. The experiment is conducted by operating the locking element 8, making the operation simple and offering advantages such as high experimental repeatability and good stability of experimental results.

[0058] See Figures 1-3 As shown, in an optional embodiment, the sleeve 6 is provided with a plurality of locking holes 7 along its axial direction, each locking hole 7 penetrating the sleeve 6. Optionally, the number of locking holes 7 is 5, 6, 10, or 12, or other numbers. Optionally, the diameter of the locking holes 7 is 0.3cm, 0.5cm, 0.8cm, or other values. Optionally, the distance between two adjacent locking holes 7 is 0.8cm, 1cm, 1.5cm, or other values. Optionally, the minimum distance between the locking hole 7 and the end of the sleeve 6 is 2cm, 3cm, 5cm, or other values.

[0059] Along the axial direction of the sliding rod 5, the sliding rod 5 is provided with one or more mating holes, each of which penetrates the sliding rod 5.

[0060] The locking element 8 passes through the locking hole 7 and the mating hole to lock the sliding rod 5 at a preset height on the sleeve 6. By providing multiple locking holes 7, it is possible to lock the sliding rod 5 at different preset heights on the sleeve 6.

[0061] Optionally, in the plurality of locking holes 7, the spacing between any two adjacent locking holes 7 is equal.

[0062] Optionally, in a plurality of mating holes, the spacing between any two adjacent mating holes is equal.

[0063] Optionally, the spacing between two adjacent locking holes 7 is equal to the spacing between two adjacent mating holes.

[0064] Optionally, the sliding rod 5 is also provided with multiple scale marking grooves; when the locking hole 7 and the mating hole are coaxial, the scale marking grooves are configured to be flush with the top of the sleeve 6. The scale marking grooves facilitate the alignment of the mating hole of the sliding rod 5 with the locking hole 7 of the sleeve 6, thereby facilitating the insertion of the locking member 8.

[0065] In this embodiment, the length of the sleeve 6 is 15cm-25cm. For example, the length of the sleeve 6 is 15cm, 18cm, 20cm, 25cm, or other values. Optionally, the length of the sleeve 6 is 20cm.

[0066] In an optional embodiment, the distance between the bottom of the sleeve 6 and the experimental platform 2 is 8cm-13cm. For example, the distance between the bottom of the sleeve 6 and the experimental platform 2 is 8cm, 10cm, 12cm, 13cm, or other values. Optionally, the distance between the bottom of the sleeve 6 and the experimental platform 2 is 10cm.

[0067] In this embodiment, the outer diameter of the sleeve 6 is 1.8cm-2.5cm. For example, the outer diameter of the sleeve 6 is 1.8cm, 2cm, 2.2cm, 2.5cm, or other values. Optionally, the outer diameter of the sleeve 6 is 2cm.

[0068] In this embodiment, the inner diameter of the sleeve 6 is 0.8cm-1.8cm. For example, the inner diameter of the sleeve 6 is 0.8cm, 1cm, 1.5cm, 1.8cm, or other values. Optionally, the inner diameter of the sleeve 6 is 1.5cm.

[0069] In an optional embodiment, the length of the sliding rod 5 is 30cm-50cm. For example, the length of the sliding rod 5 is 30cm, 35cm, 40cm, 50cm, or other values. Optionally, the length of the sliding rod 5 is 40cm.

[0070] In an optional embodiment, the outer diameter of the sliding rod 5 is 0.8cm-1.8cm. For example, the outer diameter of the sliding rod 5 is 0.8cm, 1cm, 1.5cm, 1.8cm, or other values. Optionally, the outer diameter of the sliding rod 5 is 1cm.

[0071] In an optional embodiment, the bottom of the sliding rod 5 has a second threaded hole that mates with the experimental piece 9.

[0072] In this embodiment, the diameter of the second threaded hole is 0.3cm-1cm. For example, the diameter of the second threaded hole is 0.3cm, 0.5cm, 0.8cm, 1cm, or other values. Optionally, the diameter of the second threaded hole is 0.5cm.

[0073] In an optional embodiment, the sliding rod 5 is made of stainless steel. Optionally, the mass of the sliding rod 5 is 200g-300g. For example, the mass of the sliding rod 5 is 200g, 220g, 250g, 300g, or other values. Optionally, the mass of the sliding rod 5 is 240g.

[0074] In an optional embodiment, the bottom of the experimental piece 9 is curved, hemispherical, or other shapes. By using a curved or hemispherical bottom, the experimental piece 9 has a smooth impact surface, which can be applied evenly to the target muscle area.

[0075] In an optional embodiment, the bottom of the experimental piece 9 is a hemispherical shape with a diameter of 1 cm.

[0076] In an optional embodiment, the sliding rod 5 is threadedly connected to the counterweight 4, and the sliding rod 5 is also threadedly connected to the experimental piece 9. This threaded connection allows for quick replacement of both the counterweight 4 and the experimental piece 9.

[0077] In an optional embodiment, the bottom of the counterweight 4 is provided with a counterweight threaded hole that is screwed to the sliding rod 5, and the top of the counterweight 4 is provided with a counterweight threaded post that can mate with the counterweight threaded hole; or, the bottom of the counterweight 4 is provided with a counterweight threaded post that is screwed to the sliding rod 5, and the top of the counterweight 4 is provided with a counterweight threaded hole that can mate with the counterweight threaded post. By providing mateable threaded structures at the bottom and top of the counterweight 4, detachable connection between multiple counterweights 4 is facilitated, which helps to increase the selection of counterweights.

[0078] In an optional embodiment, the weight of the counterweight 4 may include one or more of the following: 500g, 750g, 1000g, 1250g, 1500g, 1750g, and 2000g, or may include other weight specifications.

[0079] In the optional scheme of this embodiment, there are multiple experimental pieces 9, and the bottom shapes of different experimental pieces 9 are different.

[0080] See Figure 1 and Figure 2 As shown, in the optional scheme of this embodiment, the experimental table 2 is a metal plate structure, which can be used to place the limbs of the experimental subject.

[0081] In an optional embodiment, a fixing structure 10 is provided on the surface of the experimental table 2; the fixing structure 10 includes cable ties or other structures. The fixing structure 10 helps to fix the experimental object to the surface of the experimental table 2.

[0082] In an optional embodiment, the bottom of the experimental platform 2 is connected to an anti-slip structure 1. The anti-slip structure 1 can be used to improve the stability of the skeletal muscle injury experimental device during use.

[0083] In an optional embodiment, the inner wall of the sleeve 6 is a smooth inner wall with a guiding function, which is used to reduce the offset and friction of the sliding rod 5 during its descent.

[0084] In an optional embodiment, the locking element includes a pin rod and a pin cap; for example, the pin rod is 3cm long and 0.4cm in diameter.

[0085] In an optional embodiment, the surface of the locking member is a smooth surface, which facilitates smooth insertion and removal in the locking hole of the sleeve 6 and the mating hole of the sliding rod 5, and makes it easy to quickly adjust the position of the sliding rod 5 and release it.

[0086] To better understand this embodiment, the following is a brief description of the steps for using the skeletal muscle injury experimental device:

[0087] The experimental subject is fixed on the experimental table 2, and the target muscle area is located below the sliding rod 5. The position of the sliding rod 5 is adjusted, and the relative position of the sliding rod 5 and the sleeve 6 is fixed by the locking piece 8 to set the falling height. The locking piece 8 is removed, so that the sliding rod 5 falls freely under the action of gravity and impacts the target muscle area vertically, thereby completing the construction of the blunt trauma model.

[0088] Compared with the prior art, the skeletal muscle injury experimental device of this embodiment has the following beneficial effects:

[0089] 1. Through the precisely designed structure of the sleeve 6 and locking element 8, the impact height can be precisely adjusted and the stability of the sliding rod 5 movement can be ensured, thereby improving the repeatability of the experiment.

[0090] 2. The design of the detachable counterweight 4 and experimental piece 9 makes the skeletal muscle injury experimental device adaptable to different experimental needs and highly flexible.

[0091] 3. The skeletal muscle injury experimental device has a simple structure and is easy to operate. It does not require multiple people to assist in completing the experiment, thus saving labor costs.

[0092] 4. The anti-slip design of experimental platform 2 ensures the stability of the skeletal muscle injury experimental device and reduces the risk of accidents during experimental operation.

[0093] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An experimental apparatus for skeletal muscle injury, characterized in that, Includes experimental platform, support, sleeve, sliding rod, counterweight, experimental piece, and locking mechanism; The bracket is fixedly connected to the experimental platform, and the sleeve is connected to the bracket; the sleeve is located above the experimental platform, and the bottom of the sleeve can be spaced apart from the experimental platform; the top end of the sliding rod is detachably connected to the counterweight, and the bottom end of the sliding rod is detachably connected to the experimental piece; The sleeve has a sleeve chamber that extends axially along the sleeve and is open at both ends; the sliding rod is slidably connected to the sleeve, and at least a portion of the sliding rod is located inside the sleeve chamber; the counterweight is located outside the sleeve chamber and along an axial direction perpendicular to the sleeve, and the cross-sectional area of ​​the counterweight is larger than the cross-sectional area of ​​the opening of the sleeve chamber; The locking member is connected to the sleeve and the sliding rod respectively. The locking member can lock the sliding rod at a preset height in the sleeve. The locking member is configured to unlock the sliding rod when it is opened, so that the sliding rod moves along the sleeve cavity under the action of gravity and drives the experimental piece to abut or approach the experimental table.

2. The skeletal muscle injury experimental apparatus according to claim 1, characterized in that, Along the axial direction of the sleeve, the sleeve is provided with a plurality of locking holes, each of the locking holes penetrating the sleeve; Along the axial direction of the sliding rod, the sliding rod is provided with one or more mating holes, each of the mating holes penetrating the sliding rod; The locking element passes through the locking hole and the mating hole to lock the sliding rod at a preset height on the sleeve.

3. The skeletal muscle injury experimental apparatus according to claim 2, characterized in that, In the plurality of locking holes, the spacing between any two adjacent locking holes is equal; In the plurality of mating holes, the spacing between any two adjacent mating holes is equal; The distance between two adjacent locking holes is equal to the distance between two adjacent mating holes; The sliding rod is also provided with multiple scale marking grooves; when the locking hole and the mating hole are coaxial, the scale marking grooves are configured to be flush with the top of the sleeve.

4. The skeletal muscle injury experimental apparatus according to claim 3, characterized in that, The number of locking holes is 10, the diameter of the locking holes is 0.5cm, and the distance between two adjacent locking holes is 1cm.

5. The experimental apparatus for skeletal muscle injury according to claim 1, characterized in that, The sleeve has a length of 15cm-25cm, the distance between the bottom of the sleeve and the experimental table is 8cm-13cm, the outer diameter of the sleeve is 1.8cm-2.5cm, and the inner diameter of the sleeve is 0.8cm-1.8cm. The sliding rod has a length of 30cm-50cm, an outer diameter of 0.8cm-1.8cm, and a second threaded hole at the bottom that mates with the experimental piece, the diameter of which is 0.3cm-1cm. The sliding rod is made of stainless steel and weighs 200g-300g. The bottom of the experimental piece is curved or hemispherical.

6. The skeletal muscle injury experimental apparatus according to claim 5, characterized in that, The sleeve is 20cm long, the distance between the bottom of the sleeve and the experimental table is 10cm, the outer diameter of the sleeve is 2cm, and the inner diameter of the sleeve is 1.5cm. The sliding rod is 40cm long, has an outer diameter of 1cm, and the second threaded hole has a diameter of 0.5cm; the sliding rod has a mass of 240g. The bottom of the experimental piece is a hemispherical shape with a diameter of 1 cm.

7. The experimental apparatus for skeletal muscle injury according to claim 1, characterized in that, The sliding rod is threadedly connected to the counterweight, and the sliding rod is also threadedly connected to the experimental piece.

8. The experimental apparatus for skeletal muscle injury according to claim 1, characterized in that, The bottom of the counterweight block is provided with a counterweight threaded hole that is screwed to the sliding rod, and the top of the counterweight block is provided with a counterweight threaded post that can cooperate with the counterweight threaded hole. Alternatively, the bottom of the counterweight block is provided with a counterweight threaded post that is screwed to the sliding rod, and the top of the counterweight block is provided with a counterweight threaded hole that can cooperate with the counterweight threaded post.

9. The experimental apparatus for skeletal muscle injury according to claim 1, characterized in that, The weight of the counterweight includes one or more of the following: 500g, 750g, 1000g, 1250g, 1500g, 1750g, and 2000g. The number of experimental pieces is multiple, and the bottom shape of each experimental piece is different.

10. The experimental apparatus for skeletal muscle injury according to claim 1, characterized in that, The experimental platform is a metal plate structure; The experimental table is provided with a fixing structure; the fixing structure includes binding straps; The bottom of the experimental platform is connected to an anti-slip structure; The position of the sleeve fixedly connected to the bracket is adjustable.

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