Punching device for animal wound model

Abstract

A punching device for an animal wound model comprises a fixed lower arm and a movable upper arm, wherein the movable upper arm and the fixed lower arm are hinged through a pin shaft passing through an articulated bracket and an articulated seat, a through hole is arranged at the front of the fixed lower arm, a hollow punching knife is installed at the front lower end of the fixed lower arm, a strip hole is arranged at the front of the movable upper arm, the through hole and the strip hole are all located between the hinge point and the front ends of the movable upper arm and the fixed lower arm, a lifting rod passes through the hollow punching knife, the through hole and the strip hole, a pad is arranged at the lower end of the lifting rod, a movement spacing is left between the pad and the blade of the hollow punching knife, the length of the strip hole is greater than the movement spacing between the pad and the blade, the spacing between the rear ends of the movable upper arm and the fixed lower arm is greater than the length of the strip hole, an axial limiter is arranged at the upper part of the lifting rod to slide with the movable upper arm, a return spring is arranged between the fixed lower arm and the movable upper arm, the rear end of the movable upper arm is pressed down, and the front end of the movable upper arm enables the lifting rod to drive the pad to rise and cooperate with the blade of the hollow punching knife to form a hole.

Description

Technical Field

[0001] The invention relates to a medical experimental instrument, in particular to a punching device for an animal wound surface model. Background Art

[0002] In clinical medical work, trauma patients with large areas of skin defects are often encountered. With the increase in traffic accidents, the incidence of acute wounds has also increased, and the research on the treatment of acute wounds has gradually deepened. In animal experiments on acute wounds, it is often necessary to establish an animal wound model as the basis for studying the laws and mechanisms of skin wound healing. In order to ensure the accuracy of the test results, a large number of animals need to be modeled at one time. At present, when establishing animal test wound models, blades, scissors, trephine or traditional punchers are usually used to excise the skin of the test animals. However, the wounds produced by these methods are of different sizes and lack consistency. They cannot eliminate confounding factors well and are easy to affect the test results. Moreover, the traditional punching method is inefficient.

[0003] Patent document No. 201020142850.2 discloses a skin defect wound generation device, which includes a trephine head, a screw, and a handle. When in use, the trephine head is perpendicular to the skin, and the handle is rotated along the axis to cut the skin with the same diameter through the circular blade of the trephine head, thereby forming a circular defect wound. However, since the wound model is usually established on the back of the experimental animal, and the subcutaneous tissue under the back of the animal is relatively soft, it is difficult for the trephine head to penetrate the subcutaneous tissue at one time, and usually only a less obvious indentation can be produced on the back of the animal, and then the corresponding skin tissue is cut with scissors.

[0004] The patent document with application number 201620146164.X discloses a special puncher for animal wound modeling, which includes two handles, a rotating pivot shaft, two clamp arms, clamp blades, a punch, and a gasket. When using it, the skin of the test animal needs to be folded in half and then pinched and lifted up, and then the puncher is held so that the jaw ends bite on both sides of the skin to be modeled, and the two handles are squeezed to make the punches and gaskets on the two clamp arms bite, thereby forming two symmetrical skin defect wounds. However, this puncher can only punch holes in opposite directions, and two wounds must be produced at one time. Some test animals, such as mice, are small in size and have a small skin area available. Using this puncher, it is impossible to form a large single wound; moreover, the bottoms of the two wounds produced by this puncher are interconnected. When applying drugs to the two wounds separately, they are easy to interfere with each other, thereby affecting the test effect and failing to reflect the healing process well. In addition, in actual experiments, different sizes of wounds often need to be made for different animals, and the blades of the above two punchers cannot be replaced. Therefore, in actual animal wound model experiments, an efficient punching device is urgently needed to meet different experimental requirements. Summary of the invention

[0005] The purpose of the present invention is to provide a perforating device for an animal wound model in view of the deficiencies in the prior art, which is simple to operate, has wide applicability, can produce a single complete wound at one time, and improves test efficiency.

[0006] The technical solution of the present invention is: a punching device for an animal wound model, comprising a fixed lower arm and a movable upper arm, the middle section of the fixed lower arm is provided with an articulated seat extending upward, the middle section of the movable upper arm is provided with an articulated bracket extending downward, a pin shaft passes through the articulated bracket and the articulated seat to hinge the movable upper arm with the fixed lower arm to form a hinge fulcrum of the movable upper arm, a through hole penetrating up and down is provided at the front part of the fixed lower arm, a hollow punching knife is installed at the lower end of the front part of the fixed lower arm corresponding to the through hole, a strip hole penetrating up and down is provided at the front part of the movable upper arm, the through hole and the strip hole are both located between the hinge point and the front ends of the movable upper arm and the fixed lower arm, a lifting rod is lifted from the hollow punching knife, The through hole and the strip hole pass through, and a pad is arranged at the lower end of the lifting rod. The diameter of the pad is larger than the diameter of the hollow punch knife. A movement spacing is left between the pad and the blade of the hollow punch knife. The long axis length of the strip hole is larger than the movement spacing between the pad and the blade of the hollow punch knife. The spacing distance between the tail ends of the movable upper arm and the fixed lower arm is larger than the long axis length of the strip hole. An axial limiter is arranged on the upper part of the lifting rod to slide with the upper end surface of the movable upper arm. A return spring is arranged between the fixed lower arm and the movable upper arm to press the tail end of the movable upper arm downward, and the front end of the movable upper arm drives the pad to rise through the lifting rod to cooperate with the blade of the hollow punch knife to form a hole.

[0007] The movement spacing between the pad and the blade of the hollow punch knife is 5~7mm, the length of the strip hole is 2.5~3.5 times the movement spacing between the pad and the blade of the hollow punch knife, the spacing distance between the movable upper arm and the tail end of the fixed lower arm is 2.5~3 times the length of the strip hole, and the distance between the hinge point and the tail end of the movable upper arm is 2.5~3.5 times the distance between the hinge point and the front end of the movable upper arm.

[0008] A knife sleeve is arranged at the front lower end of the fixed upper arm, the knife sleeve is arranged with an internal thread, and the hollow punching knife is arranged with an external thread to be threadedly connected with the knife sleeve.

[0009] A strong rubidium magnet is installed in the knife sleeve, and the strong rubidium magnet attracts the hollow punching knife in the knife sleeve.

[0010] The axial limiting member includes two rollers, which are connected by a connecting shaft and are respectively located on both sides of the strip hole.

[0011] The roller adopts a bearing.

[0012] An upper spring seat is arranged at the lower end of the movable upper arm for fixing the upper end of the return spring, and a lower spring seat is arranged at the upper end of the fixed lower arm for fixing the lower end of the return spring. The return spring is located between the hinge point and the tail ends of the movable upper arm and the fixed lower arm.

[0013] Two return springs are arranged between the movable upper arm and the fixed lower arm and are located between the hinge point and the front ends of the movable upper arm and the fixed lower arm, and the two return springs are respectively located on both sides of the lifting rod.

[0014] An upwardly extending hinged seat is respectively arranged on both sides of the front end of the fixed lower arm, and an downwardly extending hinged bracket is respectively arranged on both sides of the front end of the movable lower arm, and the width between the two hinged seats is smaller than the width between the two hinged brackets.

[0015] A guide cylinder is arranged at the front upper end of the fixed lower arm. The guide cylinder is on the same axial center line as the through hole of the fixed upper arm and is communicated with the through hole.

[0016] The above technical solution is adopted: the pin passes through the hinge bracket and the hinge seat to hinge the movable upper arm with the fixed lower arm, so that the movable upper arm and the fixed lower arm use the pin as the hinge fulcrum, and the movable upper arm can rotate around the pin. A through hole is set at the front of the fixed lower arm, and a hollow punching knife is installed at the upper end of the front of the fixed lower arm. A strip hole is set at the front of the movable upper arm, and the through hole, the hollow punching knife, and the strip hole are corresponding. The lifting rod passes through the hollow punching knife, the through hole, and the strip hole, and a cushion block is set at the lower end of the lifting rod. An axial limiter is set at the upper part of the lifting rod to form a sliding fit with the upper end surface of the movable upper arm. The length of the strip hole is greater than the moving distance between the cushion block and the blade of the hollow punching knife, and the spacing distance between the tail ends of the movable upper arm and the fixed lower arm is greater than the long axis length of the strip hole, so that the movable upper arm and the fixed lower arm form a lever with the hinge point as the fulcrum. When the rear end of the movable upper arm is pressed down, the front end of the movable upper arm will be lifted upward. At this time, the axial limiter of the lifting rod forms a sliding fit with the upwardly lifted movable upper arm, so that the lifting rod drives the pad to rise vertically along the strip hole, and the strip hole gives way to the rising lifting rod. As the pad rises, it cooperates with the blade of the hollow punch knife to form a hole. Since the lifting rod passes through the hollow punch knife, the hollow punch knife can guide the lifting rod to prevent the lifting rod from deflecting during the rising process, thereby ensuring the accuracy of the punching. The diameter of the pad is set to be larger than the diameter of the hollow punch knife, so that the blade of the hollow punch knife can resist the pad and cooperate with the pad to complete the punching. After the punching is completed, the movable upper arm and the fixed lower arm return to their original state through the return spring between the two. When using this punching device to establish an animal wound model, first make a linear incision with the same length as the diameter of the pad at the location where the test animal needs to be punched. The linear incision can pass through the meat membrane layer, and then insert the pad into the linear incision, and rotate the pad to separate the tissue layers until the pad is completely inserted under the skin. Then adjust the punching device so that the hollow punch knife is close to the animal skin, and then press down on the movable upper arm. Through the lever principle, the lifting rod drives the pad to rise and engage with the blade of the hollow punch knife, thereby removing the corresponding skin tissue and completing the establishment of the animal wound. It can be seen that the punching device can form a single complete wound at one time, and can form wounds of the same size and shape for multiple animals, which can effectively eliminate the test errors caused by inconsistent wound sizes and improve the accuracy of the test results. In addition, the punching device is simple to operate, which greatly improves the work efficiency of the test personnel.

[0017] The moving distance between the pad and the blade of the hollow punch knife is 5-7 mm, the length of the strip hole is 2.5-3.5 times the moving distance between the pad and the blade of the hollow punch knife, the spacing between the tail ends of the movable upper arm and the fixed lower arm is 2.5-3 times the length of the strip hole, and the distance between the hinge point and the tail end of the movable upper arm is 2.5-3.5 times the distance between the hinge point and the front end of the movable upper arm. The movable upper arm has enough moving distance to ensure that the movable upper arm can drive the pad to engage with the hollow punch knife through the lever principle to complete the punching.

[0018] A knife sleeve is arranged at the front lower end of the fixed upper arm, the knife sleeve is provided with an internal thread, and the hollow punch knife is provided with an external thread which is threadably connected to the knife sleeve. By setting the knife sleeve, the hollow punch knife and the knife sleeve form a detachable threaded connection, so that hollow punch knives of different sizes can be replaced according to actual needs, and the hollow punch knife can be easily disassembled for disinfection and cleaning.

[0019] A strong rubidium magnet is installed in the knife sleeve, and the strong rubidium magnet absorbs the hollow punch knife into the knife sleeve. The strong rubidium magnet is used to fix the hollow punch knife, which not only ensures the reliability of the connection, but also facilitates the installation of the hollow punch knife, and the operation is simple and convenient.

[0020] The axial limiter includes two rollers, which are connected by a connecting shaft and are respectively located on both sides of the strip hole. Using the rollers as the axial limiter of the lifting rod can make the sliding fit between the axial limiter and the upper end surface of the movable upper arm smoother, thereby ensuring the vertical rise of the lifting rod.

[0021] An upper spring seat is arranged at the lower end of the movable upper arm for fixing the upper end of the return spring. A lower spring seat is arranged at the upper end of the fixed lower arm for fixing the lower end of the return spring. The return spring is located between the hinge point and the tail ends of the movable upper arm and the fixed lower arm. The two ends of the return spring are respectively fixed in the upper spring seat and the lower spring seat, so that the installation of the return spring is reliable, and the return effect of the return spring on the movable upper arm and the fixed lower arm is guaranteed. The return spring is arranged between the hinge point and the tail ends of the movable upper arm and the fixed lower arm, so as to avoid the return spring from interfering with the lifting rod.

[0022] Two return springs are arranged between the movable upper arm and the fixed lower arm, and are located between the hinge point and the front end of the movable upper arm and the fixed lower arm, and the two return springs are respectively located on both sides of the lifting rod to avoid interference of the return springs on the lifting of the lifting rod.

[0023] An upwardly extending hinged seat is respectively arranged on both sides of the front end of the fixed lower arm, and a downwardly extending hinged bracket is respectively arranged on both sides of the front end of the movable lower arm. The width between the two hinged seats is smaller than the width between the two hinged brackets, which leaves room for movement of the lifting rod while further ensuring the hinge reliability of the movable upper arm and the fixed lower arm.

[0024] A guide cylinder is arranged at the front upper end of the fixed lower arm. The guide cylinder is on the same axial line as the through hole of the fixed upper arm and is connected with the through hole, so that the lifting rod can pass through the guide cylinder. The guide cylinder further guides the lifting rod during the rising process, thereby avoiding the lifting rod from deflecting during the rising process and ensuring that it can drive the cushion block to rise vertically.

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2 for Figure 1 Schematic diagram of direction A.

[0028] In the accompanying drawings, 1 is a fixed lower arm, 1-1 is an articulated seat, 1-2 is a through hole, 1-3 is a lower spring seat, 1-4 is a guide cylinder, 2 is a movable upper arm, 2-1 is an articulated bracket, 2-2 is a strip hole, 2-3 is an upper spring seat, 3 is a pin shaft, 4 is a hollow punch knife, 5 is a lifting rod, 6 is a cushion block, 7 is an axial limiter, 7-1 is a roller, 8 is a return spring, 9 is a knife sleeve, and 10 is a strong rubidium magnet. DETAILED DESCRIPTION

[0029] See also Figure 1 to Figure 2, a punching device for an animal wound model, comprising a fixed lower arm 1 and a movable upper arm 2. An upwardly extending hinge seat 1-1 is provided in the middle section of the fixed lower arm 1, and an downwardly extending hinge bracket 2-1 is provided in the middle section of the movable upper arm 2. A pin shaft 3 passes through the hinge bracket 2-1 and the hinge seat 1-1 to hinge the movable upper arm 2 with the fixed lower arm 1, forming a hinge fulcrum of the movable upper arm 2, so that the movable upper arm 2 forms a lever with the hinge fulcrum as the fulcrum, and can rotate around the pin shaft 3. In this embodiment, an upwardly extending hinge seat 1-1 is respectively provided on both sides of the front end of the fixed lower arm 1, and a downwardly extending hinge bracket 2-1 is respectively provided on both sides of the front end of the movable lower arm 2. The width between the two hinge seats 1-1 is smaller than the width between the two hinge brackets 2-1, which leaves space for installing the lifting rod 5 while further ensuring the hinge reliability of the movable upper arm 2 and the fixed lower arm 1, making the structure of the punching device more stable. A through hole 1-2 penetrating up and down is arranged at the front of the fixed lower arm 1, a hollow punching knife 4 is installed at the front lower end of the fixed lower arm 1 corresponding to the through hole 1-2, a knife sleeve 9 is arranged at the front lower end of the fixed lower arm 1, the knife sleeve 9 is provided with an internal thread, and the hollow punching knife 4 is provided with an external thread threadedly connected with the knife sleeve 9. By arranging the knife sleeve 9 on the fixed lower arm 1, the hollow punching knife 4 and the knife sleeve 9 form a detachable connection. Therefore, in actual use, the hollow punching knife 4 of different sizes can be replaced according to actual needs, and the replacement is convenient, so that the punching device can be applied to different experimental animals, expanding the scope of application, and can also be installed in the knife sleeve 9. A strong rubidium magnet 10 is installed, and the strong rubidium magnet 10 absorbs the hollow punch knife 4 into the knife sleeve 9. The knife sleeve 9 and the hollow punch knife 4 are detachably connected through the strong rubidium magnet 10. On the one hand, the installation of the hollow punch knife 4 is reliable. On the other hand, when the tester installs the hollow punch knife 4, he only needs to hold the upper end of the hollow punch knife 4 and align it with the knife sleeve 9, and the strong rubidium magnet 10 can tightly absorb it. The installation is fast and simple, which prevents the tester from being injured by contacting the blade during the installation of the hollow punch knife 4. Moreover, the hollow punch knife 4 adopts a detachable connection method, which is convenient for cleaning the residues after the use of the punching device, and is convenient for disinfection and sterilization. A strip hole 2-2 that runs through the upper and lower parts is set at the front of the movable upper arm 2. The through hole 1-2 and the strip hole 2-2 are both located between the hinge point and the front end of the movable upper arm 2 and the fixed lower arm 1. A lifting rod 5 passes through the hollow punch knife 4, the knife sleeve 9, the through hole 1-2, and the strip hole 2-2. A cushion block 6 is disposed at the lower end of the lifting rod 5 . The diameter of the cushion block 6 is larger than the diameter of the hollow punching knife 4 , so as to ensure that the hollow punching knife 4 can resist the cushion block 6 .An axial limiter 7 is provided on the upper part of the lifting rod 5 to slide with the upper end surface of the movable upper arm 2. The axial limiter 7 includes two rollers 7-1, which are connected by a connecting shaft and are respectively located on both sides of the strip hole 2-2. The roller 7-1 is used as the axial limiter of the lifting rod 5 to make the sliding cooperation with the movable upper arm 2 smoother, thereby ensuring the vertical rise of the lifting rod 5 during use. The roller 7-1 can use a bearing to reduce the friction between the roller 7-1 and the connecting shaft, thereby extending the service life of the axial limiter 7 and ensuring the reliability of the sliding cooperation. There is a movement spacing between the cushion block 6 and the blade of the hollow punch knife 4 to ensure that the cushion block 6 has a certain space to rise. The long axis length of the strip hole 2-2 is greater than the movement spacing between the cushion block 6 and the blade of the hollow punch knife 4. The spacing between the tail ends of the movable upper arm 2 and the fixed lower arm 1 is greater than the long axis length of the strip hole 2-2, so that the movable upper arm 2 has enough movement distance, thereby ensuring that the movable upper arm 2 can drive the cushion block 6 to rise through the lever principle. A return spring 8 is set between the fixed lower arm 1 and the movable upper arm 2. The tail end of the movable upper arm 2 is pressed down, and the front end of the movable upper arm 2 drives the cushion block 6 to rise through the lifting rod 5 to cooperate with the blade of the hollow punch knife 4 to form a hole. After the hole is punched, the tension of the return spring 8 restores the movable upper arm 2 and the fixed lower arm 1 to their original positions.

[0030] In this embodiment, an upper spring seat 2-3 is set at the lower end of the movable upper arm 2 for fixing the upper end of the return spring 8, and a lower spring seat 1-3 is set at the upper end of the fixed lower arm 1 for fixing the lower end of the return spring 8. The return spring 8 is located between the hinge point and the tail ends of the movable upper arm 2 and the fixed lower arm 1 to prevent the return spring 8 from interfering with the movement of the lifting rod 5.

[0031] In another embodiment of the present invention, two return springs 8 may be arranged between the movable upper arm 2 and the fixed lower arm 1, and located between the hinge point and the front end of the movable upper arm 2 and the fixed lower arm 1, and the two return springs 8 are respectively located on both sides of the lifting rod 5. While ensuring the return effect of the return spring 8 on the movable upper arm 2 and the fixed lower arm 1, it will not interfere with the lifting and lowering movement of the lifting rod 5.

[0032] The movement spacing between the pad block 6 and the blade of the hollow punch knife 4 in the present invention is 5~7mm, the length of the strip hole 2-2 is 2.5~3.5 times the movement spacing between the pad block 6 and the blade of the hollow punch knife 4, the spacing distance between the tail ends of the movable upper arm 2 and the fixed lower arm 1 is 2.5~3 times the length of the strip hole 2-2, and the distance between the hinge point and the tail end of the movable upper arm 2 is 2.5~3.5 times the distance between the hinge point and the front end of the movable upper arm 2, so that the movable upper arm 2 has enough moving distance, thereby ensuring that the movable upper arm 2 can drive the pad block 6 to engage with the hollow punch knife 4 through the lever principle to complete the punching.

[0033] When using the present punching device to establish an animal wound model, first make a linear incision with the same length as the diameter of the pad 6 at the position where the test animal needs to be punched, and the depth of the linear incision can pass through the carnosine layer. Then insert the pad 6 into the linear incision, and rotate the pad 6 to separate the tissue layers of the test animal's skin until the pad 6 is completely inserted under the skin, and then adjust the present punching device. Since the distance between the pad 6 and the blade of the hollow punching knife 4 is usually only 5-7 mm, after the pad 6 is inserted under the animal's skin, the blade of the hollow punching knife 4 can basically be attached to the animal's skin. Then press the tail end of the movable upper arm 2 downward, and the front end of the movable upper arm 2 will be lifted upward through the lever principle. At this time, the axial limit member 7 of the lifting rod 5 forms a sliding fit with the upwardly lifted movable upper arm 2, and the lifting rod 5 is given way through the strip hole 2-2 of the movable upper arm 2, so that the lifting rod 5 drives the pad 6 to move upward along the strip hole 2-2. Since a guide cylinder 1-4 is provided at the front upper end of the fixed lower arm 1, the guide cylinder 1-4 is on the same axial line as the through hole 1-2 of the fixed lower arm 1 and is connected to the through hole 1-2, the lifting rod 5 passes through the hollow punching knife 4, the knife sleeve 9, the through hole 1-2, the guide cylinder 1-4, and the strip hole 2-2 in sequence. Therefore, when the lifting rod 5 moves upward, the hollow punching knife 4, the knife sleeve 9 and the guide cylinder 1-4 can all guide the lifting rod 5 to prevent the lifting rod 5 from deflecting during the rising process, so that the lifting rod 5 drives the cushion block 6 to make a vertical upward movement until the cushion block 6 rises to against the blade of the hollow punching knife 4 and engages with the blade of the hollow punching knife 4, thereby removing the corresponding skin tissue, completing the punching on the skin of the test animal, and establishing an animal wound model. After completing the punching, just release the force applied to the movable upper arm 2, and restore the movable upper arm 2 to its original position under the pulling force of the return spring 8, so that the pad 6 can be separated from the hollow punching knife 4, and then the hollow punching knife 4 can be removed from the knife sleeve 9, the residue can be cleaned, and the punching device can be cleaned for next use.

[0034] The punching device can form a single complete wound at one time, and can form wounds of the same size and shape for multiple test animals, which can effectively eliminate the test errors caused by inconsistent wound sizes, improve the accuracy of the test results, and reduce the pain of the test animals. During the punching process, the lifting rod 5 can maintain vertical ascent under the guidance of the guide cylinders 1-4, which can ensure the accuracy of the punching shape. The hollow punching knife 4 in the punching device can be flexibly disassembled and replaced very conveniently, meeting the sterility requirements in the test. Hollow punching knives 4 of different diameters can be designed, so hollow punching knives 4 of suitable diameters can be selected for different test animals, and the scope of application is wider. Moreover, the punching device is simple to operate and can greatly improve the work efficiency of the test personnel.

Claims

1. A perforating device for an animal wound model, characterized in that: The movable upper arm (2) comprises a fixed lower arm (1) and a movable upper arm (2). The middle section of the fixed lower arm (1) is provided with an articulated seat (1-1) extending upward, and the middle section of the movable upper arm (2) is provided with an articulated bracket (2-1) extending downward. A pin shaft (3) passes through the articulated bracket (2-1) and the articulated seat (1-1) to hinge the movable upper arm (2) with the fixed lower arm (1) to form a hinge fulcrum of the movable upper arm (2). The front part of the fixed lower arm (1) is provided with a through hole (1-2) penetrating vertically. A hollow punching knife (4) is installed at the lower end of the front part of the fixed lower arm (1) to correspond to the through hole (1-2). The front part of the movable upper arm (2) is provided with a strip hole (2-2) penetrating vertically. The through hole (1-2) and the strip hole (2-2) are both located between the hinge point and the front ends of the movable upper arm (2) and the fixed lower arm (1). A lifting rod (5) is provided from the hollow punching knife (4) and the through hole (1-2). , a strip hole (2-2) passes through, a pad (6) is arranged at the lower end of the lifting rod (5), the diameter of the pad (6) is larger than the diameter of the hollow punch knife (4), a movement spacing is left between the pad (6) and the blade of the hollow punch knife (4), the long axis length of the strip hole (2-2) is larger than the movement spacing between the pad (6) and the blade of the hollow punch knife (4), the spacing distance between the tail ends of the movable upper arm (2) and the fixed lower arm (1) is larger than the long axis length of the strip hole (2-2), an axial limiter (7) is arranged on the upper part of the lifting rod (5) and is slidably matched with the upper end surface of the movable upper arm (2), a return spring (8) is arranged between the fixed lower arm (1) and the movable upper arm (2), so that the tail end of the movable upper arm (2) is pressed downward, and the front end of the movable upper arm (2) drives the pad (6) to rise through the lifting rod (5) to cooperate with the blade of the hollow punch knife (4) to form a hole; The moving distance between the cushion block (6) and the blade of the hollow punch knife (4) is 5 to 7 mm, the length of the strip hole (2-2) is 2.5 to 3.5 times the moving distance between the cushion block (6) and the blade of the hollow punch knife (4), the spacing distance between the rear ends of the movable upper arm (2) and the fixed lower arm (1) is 2.5 to 3 times the length of the strip hole (2-2), and the distance between the hinge point and the rear end of the movable upper arm (2) is 2.5 to 3.5 times the distance between the hinge point and the front end of the movable upper arm (2); The axial limiting member (7) comprises two rollers, which are connected via a connecting shaft and are respectively located on two sides of the strip hole (2-2); An upwardly extending hinge seat (1-1) is respectively arranged on both sides of the front end of the fixed lower arm (1), and a downwardly extending hinge bracket (2-1) is respectively arranged on both sides of the front end of the movable upper arm (2), and the width between the two hinge seats (1-1) is smaller than the width between the two hinge brackets (2-1); A guide cylinder (1-4) is provided at the front upper end of the fixed lower arm (1); the guide cylinder (1-4) and the through hole (1-2) of the fixed lower arm (1) are on the same axial center line and are in communication with the through hole (1-2).

2. The perforating device for an animal wound model according to claim 1, characterized in that: A knife sleeve (9) is provided at the front lower end of the fixed lower arm (1), the knife sleeve (9) is provided with an internal thread, and the hollow punching knife (4) is provided with an external thread and is threadably connected to the knife sleeve (9).

3. The perforating device for an animal wound model according to claim 2, characterized in that: A strong rubidium magnet (10) is installed in the knife sleeve (9), and the strong rubidium magnet (10) attracts the hollow punching knife (4) into the knife sleeve (9).

4. The perforating device for an animal wound model according to claim 1, characterized in that: The roller adopts a bearing.

5. The perforating device for an animal wound model according to claim 1, characterized in that: An upper spring seat (2-3) is provided at the lower end of the movable upper arm (2) for fixing the upper end of a return spring (8); a lower spring seat (1-3) is provided at the upper end of the fixed lower arm (1) for fixing the lower end of the return spring (8); the return spring (8) is located between the hinge point and the tail ends of the movable upper arm (2) and the fixed lower arm (1).

6. The perforating device for an animal wound model according to claim 1, characterized in that: Two return springs (8) are arranged between the movable upper arm (2) and the fixed lower arm (1), and are located between the hinge point and the front ends of the movable upper arm (2) and the fixed lower arm (1), and the two return springs (8) are respectively located on both sides of the lifting rod (5).

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