Skin wound slide bar type expansion fixer for animal experiment
By designing a simplified slide bar-type expansion fixator, the problem of simulating skin wounds on small laboratory animals was solved, enabling efficient experiments with multiple wounds, reducing costs and animal damage, and making it suitable for skin fibrosis research.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SICHUAN UNIV
- Filing Date
- 2025-01-20
- Publication Date
- 2026-05-26
AI Technical Summary
Existing technologies are difficult to effectively simulate human skin wound healing, especially scar formation, in small laboratory animals such as mice. Furthermore, traditional expansion fixators are expensive after miniaturization, difficult to use in parallel, cannot adjust the tension of the surrounding skin, and have limited observation of the wound.
A sliding bar type expansion and fixation device for skin wounds in animal experiments was designed. It consists of a main shaft, a fixed suture plate, a sliding suture plate, a spring-loaded retaining bolt, and a spring. It has a simplified mechanical structure, is suitable for multiple wounds in small animals, and adjusts the tension of the surrounding skin by the elastic force of the spring, which facilitates the observation of the wound and allows for adjustable suture fixation.
It enables simulated healing experiments of multiple wounds on small laboratory animals, reducing waste of laboratory animal resources, lowering costs, simplifying procedures, reducing animal mortality, and is applicable to research on induced skin fibrosis.
Smart Images
Figure CN224269501U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of experimental instruments for animal skin wounds, and relates to a sliding rod type expansion and fixation device for animal experimental skin wounds. Background Technology
[0002] Skin trauma is the most frequent physical injury most people face in their lifetime. Normal wound healing is crucial for survival and health. As early as prehistoric times, Shennong, the legendary Chinese figure, discovered herbal plants that aided wound healing and rudimentary surgical treatments, such as pressure to stop bleeding. During the time of Hammurabi in the ancient Babylonian Kingdom (circa 1750 BC), the Sumerians were among the first to describe early wound care on clay tablets, including washing wounds with beer and hot water, and applying plasters made from materials such as wine lees and lizard droppings. Hippocrates (circa 400 BC), considered the "father of modern medicine," elaborated on the importance of draining pus for wound healing. It wasn't until the 19th century that significant progress was made in controlling infection, stopping bleeding, and treating necrotic tissue.
[0003] The skin is the body's first line of defense, protecting it from UV damage and microbial invasion. It also prevents moisture loss and protects internal organs. In daily life, we are constantly exposed to various mechanical, chemical stimuli and microbial attacks; therefore, rapid skin repair after injury is crucial for maintaining homeostasis. In modern medical research and clinical trials, simulating the human skin wound healing process using animal models is a frequently used research method. However, in studies simulating the physiological and pathological healing of human skin wounds using animal models, researchers have found that due to species heterogeneity, the wound healing mechanisms of experimental animals and humans are not entirely the same. This poses a significant challenge to animal models used to simulate the physiological or pathological healing process of human skin. Therefore, how to better simulate the human skin wound healing process under physiological and pathological conditions, while also better simulating the human body's mechanical signal microenvironment under pathological conditions and inducing pathological and continuous proliferation of callus tissue, is a problem of great concern to researchers and remains largely unsolved.
[0004] Skin scarring is the most common outcome of wound healing in humans. This can be explained as a self-protective mechanism of the body, whereby the body rapidly restores skin integrity by generating collagen to fill the damaged skin, providing mechanical protection, preventing moisture loss, and protecting against potential infection. However, scar formation is often accompanied by the loss of skin appendages, altered mechanical strength, and excessive collagen fiber deposition leading to hypertrophic scars and keloids, which can cause pain, itching, contractures, and recurrent infections. Currently, an increasing number of studies focus on promoting scarless skin healing, aiming to address the problems of secondary excessive collagen fiber deposition and regeneration of skin appendages during human skin repair. This makes animal models for skin scarring increasingly important.
[0005] Currently, the experimental animals used in inducing skin scarring mainly include mice, rats, rabbits, and pigs. While pigs have the closest skin structure to humans, their accessibility is limited by experimental conditions. Mice and rats are the most widely used in relevant literature and experiments, and have the greatest research potential. However, mouse and rat models often fail to meet the current needs of inducing skin scarring. This is mainly because mouse and rat models cannot accurately simulate the healing process of human skin, especially scarred skin. For example, in mouse models, even if full-thickness skin defects form scars, the scar area is usually too small to meet the requirements, and under long-term feeding conditions, skin appendages such as hair follicles may regenerate spontaneously. Furthermore, skin fibrosis in mice under chemical stimulation involves abnormal physiological conditions and cannot properly simulate the induction of skin scarring.
[0006] Through research and development, researchers have discovered that skin fibrosis in mice under mechanical stimulation conditions can effectively simulate and induce skin scarring, making it the most suitable modeling method currently available. In current experiments simulating human skin wounds using animal models, researchers typically only use sutures to simply pull the callus tissue, with the donut-shaped silicone splint fixation method being widely used. However, this technique still has drawbacks, including difficulty in suturing and fixing, inability to adjust the tension of surrounding skin, limited observation angle of the wound, and difficulty in providing stable mechanical stimulation as the skin heals and contracts.
[0007] To address the aforementioned problems, the inventor of this utility model, in his prior Chinese invention patent "A Constant-Force Expansion Fixator for Skin Wounds in Animal Experiments and Its Application (CN117084804B)," provides a constant-force expansion fixator for skin wounds in animal experiments and its application. This device primarily comprises a wound fixation mother plate, a wound fixation daughter plate, and a constant-force spring combination. The wound fixation mother plate includes a skin fixation mother component, a guide rail component, a spring-retaining hook A, and a suture hole. The wound fixation daughter plate includes a skin fixation daughter component, a slider component, a spring-retaining hook B, and a suture hole. The skin fixation mother component and the skin fixation daughter component can be assembled to form a hollow polygon or a ring. The slider component matches the guide rail component and can slide on the guide rail. The elastic force of the constant-force spring pulls the skin fixation daughter component away from the skin fixation mother component. This fixator combines the functions of a silicone splint and a fixation device, applying continuous and constant fixation force to the wound in animal experiments. It is suitable for experimental studies related to the induction of skin fibrosis in experimental animals during wound healing.
[0008] While the aforementioned patented technology effectively addresses the shortcomings of traditional dilation devices in animal experiments, it is difficult to use the constant force dilation fixator provided by the aforementioned patented technology in parallel when using small mammals such as mice for modeling, especially when multiple wounds no larger than 10 mm need to be created on such small animals in order to save experimental animal resources. Furthermore, its structure still faces problems such as excessively high costs even after miniaturization. Utility Model Content
[0009] To address the problems in the prior art, this invention provides a sliding-bar type expander and fixator for skin wounds in animal experiments. This sliding-bar type expander and fixator has a significantly simplified mechanical structure, lower cost, and is suitable for rectangular wounds arranged side by side. It also has the functions of maintaining the wound and fixing the instruments, and can adjust the tension of the surrounding skin and facilitate wound observation. In addition, the tension adjustment and suturing fixation structures are separated, which facilitates manual suturing. It is particularly suitable for experimental studies on the induction of skin fibrosis in small laboratory animals during wound healing.
[0010] To achieve the above objectives, this utility model adopts a technical solution consisting of the following technical measures.
[0011] This utility model provides a sliding rod type expansion and fixation device for skin wounds in animal experiments, which is mainly composed of a main shaft, a fixed suture plate, a sliding suture plate, a spring-loaded retaining bolt, and a spring.
[0012] The main shaft is a cylindrical rod structure. The fixed stitching plate is fixedly connected to one end of the main shaft. The spring retaining bolt is fixedly connected to the other end of the main shaft. The sliding stitching plate is provided with a sliding hole and forms a sliding connection based on the main shaft passing through the sliding hole. The two ends of the spring are respectively fixedly connected to the spring retaining bolt and the sliding stitching plate, so that the sliding stitching plate slides on the main shaft based on the spring force.
[0013] Both the fixed suture plate and the sliding suture plate are provided with suture holes.
[0014] In this document, the spring retaining bolt can be selected as a conventional cylindrical bolt, consisting of a screw with a thread and a nut. To facilitate the fixing of the spring, the thread can be used as the fixing connection of the spring, and fixed to the thread by means of a hook / ring at the end of the spring.
[0015] In one technical solution, in order to facilitate the installation and fixation of the spring, a spring retaining bolt is also provided on the sliding stitching plate, and one end of the spring is fixedly connected to the spring retaining bolt on the sliding stitching plate.
[0016] In one technical solution, in order to facilitate the installation and fixation of the suture plate, a screw is provided on the suture plate, and a connecting hole is provided on the main shaft body, so that the screw passes through the connecting hole and is fixed by bolting with a nut for limiting.
[0017] In one technical solution, in order to facilitate suturing using the suture hole, the fixed suture plate and / or sliding suture plate are provided with suture grooves at the suture hole.
[0018] In this paper, the fixed suture plate and the sliding suture plate can be selected as conventional long strip plates. Since the sliding rod type expansion fixator of this utility model is fixed to the outside of the skin wound of the experimental animal, and expansion is achieved by suturing the fixed suture plate and the sliding suture plate to the skin around the wound, the surface of the fixed suture plate and the sliding suture plate should preferably be a smooth planar structure that fits the animal skin, or a smooth curved surface structure.
[0019] It should be noted that, based on the conventional rectangular wounds of laboratory animals, the fixed suture plate and the sliding suture plate described in this invention are usually parallel, thereby traction and expansion at both ends of the rectangular wound.
[0020] Since the fixed suture plate and / or sliding suture plate are long strips, both the fixed suture plate and / or sliding suture plate are provided with suture grooves at the suture holes. In order to enable multi-point suture, multiple suture grooves are provided around the suture holes. For example, on the sliding suture plate, a suture groove is provided at each of the two ends of the main shaft in the direction of the suture hole.
[0021] In one technical solution, the main shaft is provided with a plurality of connecting holes at different distances from the end. The connecting holes are used for fixing the stitching plate and / or the spring retaining bolt, so that the relative position and distance of the fixing stitching plate and / or the spring retaining bolt can be adjusted, or springs of different lengths / models can be replaced.
[0022] In this paper, to reduce costs and facilitate the selection of elastic force, a conventional helical spring is used. It should be noted that if wound expansion is required, the selected spring, after being installed between the spring retainer bolt and the sliding suture plate, should be in a stretched state during suturing and fixing of the skin around the wound, thereby expanding the wound based on the spring's elastic force. If wound contraction is required, the spring should be in a compressed state during suturing and fixing of the skin around the wound, thereby contracting the wound based on the spring's elastic force.
[0023] In one of the technical solutions, the spring is a constant force spring.
[0024] It should be noted that a constant force spring is a special type of spring. Under theoretical conditions, the force it applies within its range of motion is a constant. When using a constant force spring, the specific method can be referred to in the prior authorized invention patent of the applicant of this utility model, "A Constant Force Expansion Fixator for Skin Wounds in Animal Experiments and Its Application (202311341876.8)".
[0025] In one of the technical solutions, the fixed suture plate and the sliding suture plate are integrally molded parts.
[0026] On the other hand, this utility model also provides a method for applying the above-mentioned sliding bar type expander fixator for skin wounds in animal experiments, which mainly includes the following steps:
[0027] (1) Cut and punch holes in the skin tissue of the experimental animal, cut and separate the adhered skin to form a rectangular full-thickness wound;
[0028] (2) After installing the spring, position the fixed suture plate and the sliding suture plate at both ends of the full-thickness wound, and use sutures to suture and fix them to the skin around the full-thickness wound through the suture hole;
[0029] Or,
[0030] The fixed suture plate and the sliding suture plate are placed at both ends of the full-thickness wound, and are sutured to the skin around the full-thickness wound through the suture holes using sutures, and then the spring is installed.
[0031] In practical applications, multiple animal experimental skin wound slide bar type expansion fixators provided by this utility model can be used in combination for multiple wounds on the skin of experimental animals.
[0032] In practical applications, when experimental animals simulate the normal human healing process and the influence of the animal's suture membrane on wound healing is eliminated, only the spring needs to be removed.
[0033] This utility model has the following beneficial effects:
[0034] 1. The present invention provides a sliding rod type expansion and fixation device for skin wounds in animal experiments, which is suitable for wound modeling experiments of small experimental animals. It has the functions of maintaining the wound and fixing the device. The tension of the surrounding skin can be adjusted by changing the spring and adjusting the position of the spring, and the wound can be easily observed. In addition, the tension adjustment and suturing fixation structures are separated, which facilitates manual suturing. It is especially suitable for experimental studies on the induction of skin fibrosis in small experimental animals during the wound healing process.
[0035] 2. The skin wound sliding rod type expansion fixator for animal experiments provided by this utility model can be used in conjunction with multiple wound healing experiments on small mammals, especially for comparative experiments on multiple wounds on the same experimental animal, which greatly reduces the influencing factors of related experiments.
[0036] 3. The sliding rod type expansion and fixation device for skin wounds in animal experiments provided by this utility model can be directly and quickly applied, installed and adjusted, effectively reducing the number of invasive operations and anesthesias required for animals, thereby reducing animal mortality and better maintaining the ethics of laboratory animals. Attached Figure Description
[0037] Figure 1 This is a schematic diagram of the structure of the animal experimental skin wound slide bar type expansion fixator provided in Embodiment 1 of this utility model.
[0038] Figure 2 This is a schematic diagram of the main view structure of the animal experimental skin wound slide bar type expansion fixator provided in Embodiment 1 of this utility model.
[0039] Figure 3 This is a top-view structural diagram of the animal experimental skin wound slide bar type expansion fixator provided in Embodiment 1 of this utility model.
[0040] Figure 4 This is a schematic diagram of the structure of the animal experimental skin wound slide bar type expansion fixator provided in Embodiment 1 of this utility model when the spring is stretched.
[0041] Figure 5 This is a schematic diagram illustrating the application scenario of the animal experimental skin wound slide bar type expansion fixator provided in Embodiment 1 of this utility model.
[0042] In the diagram, 1 is the main shaft, 2 is the fixed suture plate, 2-A is the screw, 3 is the sliding suture plate, 4 is the spring retaining bolt, 5 is the spring, 6 is the suture hole, and 7 is the suture groove. Detailed Implementation
[0043] To further understand this utility model, preferred embodiments are described below in conjunction with examples. However, it should be understood that these descriptions are merely for further illustrating the features and advantages of this utility model, and not for limiting the scope of the claims. Those skilled in the art can refer to this document to appropriately modify the process parameters. It is particularly important to note that all similar substitutions and modifications are obvious to those skilled in the art and are considered to be included within this utility model. The structure and application of this utility model have been described through preferred embodiments. Those skilled in the art can clearly modify or appropriately change and combine the structure and application described herein without departing from the content, spirit, and scope of this utility model to realize and apply the technology of this utility model. While it is believed that those skilled in the art are fully aware of the following terms, the following definitions are stated to help illustrate the subject matter disclosed in this utility model. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer are followed. This application should not be construed as being limited to the specific embodiments described.
[0044] This utility model provides a sliding rod type expansion and fixation device for skin wounds in animal experiments, which is mainly composed of a main shaft, a fixed suture plate, a sliding suture plate, a spring-loaded retaining bolt, and a spring.
[0045] The main shaft is a cylindrical rod structure. The fixed stitching plate is fixedly connected to one end of the main shaft. The spring retaining bolt is fixedly connected to the other end of the main shaft. The sliding stitching plate is provided with a sliding hole and forms a sliding connection based on the main shaft passing through the sliding hole. The two ends of the spring are respectively fixedly connected to the spring retaining bolt and the sliding stitching plate, so that the sliding stitching plate slides on the main shaft based on the spring force.
[0046] Both the fixed suture plate and the sliding suture plate are provided with suture holes.
[0047] In this document, the spring retaining bolt can be selected as a conventional cylindrical bolt, consisting of a screw with a thread and a nut. In order to facilitate the fixing of the spring, in one embodiment, the thread can be used as the fixing connection of the spring, and fixed to the thread by a hook / ring at the end of the spring.
[0048] In one embodiment, to facilitate the installation and fixation of the spring, a spring retaining bolt is also provided on the sliding stitching plate, and one end of the spring is fixedly connected to the spring retaining bolt on the sliding stitching plate.
[0049] In one embodiment, to facilitate the installation and fixation of the suture plate, a screw is provided on the suture plate, and a connecting hole is provided on the main shaft body, so that the screw passes through the connecting hole and is fixed by bolting with a nut for limiting.
[0050] In one embodiment, to facilitate suturing using the suture hole, the fixed suture plate and / or sliding suture plate are provided with suture grooves at the suture hole.
[0051] In this paper, the fixed suture plate and the sliding suture plate can be selected as conventional long strip plates. Since the sliding rod type expansion fixator of this utility model is fixed to the outside of the skin wound of the experimental animal, and expansion is achieved by suturing the fixed suture plate and the sliding suture plate to the skin around the wound. In one embodiment, the surface of the fixed suture plate and the sliding suture plate should preferably be a smooth planar structure that fits the animal skin, or a smooth curved surface structure.
[0052] It should be noted that, based on the conventional rectangular wounds of laboratory animals, the fixed suture plate and the sliding suture plate described in this invention are usually parallel, thereby traction and expansion at both ends of the rectangular wound.
[0053] Since the fixed suture plate and / or sliding suture plate are long strips, both the fixed suture plate and / or sliding suture plate are provided with suture grooves at the suture holes. In order to enable multi-point suture, in one embodiment, multiple suture grooves are provided around the suture holes. For example, on the sliding suture plate, a suture groove is provided at each of the two ends of the main shaft in the direction of the suture hole.
[0054] In one embodiment, the main shaft is provided with a plurality of connecting holes at different distances from the end. The connecting holes are used for fixing the stitching plate and / or the spring retaining bolt, so that the relative position and distance of the fixing stitching plate and / or the spring retaining bolt can be adjusted, or springs of different lengths / models can be replaced.
[0055] In this paper, to reduce costs and facilitate the selection of elastic force, a conventional helical spring is used. It should be noted that if wound expansion is required, the selected spring, after being installed between the spring retainer bolt and the sliding suture plate, should be in a stretched state during suturing and fixing of the skin around the wound, thereby expanding the wound based on the spring's elastic force. If wound contraction is required, the spring should be in a compressed state during suturing and fixing of the skin around the wound, thereby contracting the wound based on the spring's elastic force.
[0056] In one embodiment, the spring is a constant force spring.
[0057] It should be noted that a constant force spring is a special type of spring. Under theoretical conditions, the force it applies within its range of motion is a constant. When using a constant force spring, the specific method can be referred to in the prior authorized invention patent of the applicant of this utility model, "A Constant Force Expansion Fixator for Skin Wounds in Animal Experiments and Its Application (202311341876.8)".
[0058] In one embodiment, the fixed suture plate and the sliding suture plate are integrally molded parts.
[0059] On the other hand, this utility model also provides a method for applying the above-mentioned sliding bar type expander fixator for skin wounds in animal experiments, which mainly includes the following steps:
[0060] (1) Cut and punch holes in the skin tissue of the experimental animal, cut and separate the adhered skin to form a rectangular full-thickness wound;
[0061] (2) After installing the spring, position the fixed suture plate and the sliding suture plate at both ends of the full-thickness wound, and use sutures to suture and fix them to the skin around the full-thickness wound through the suture hole;
[0062] Or,
[0063] The fixed suture plate and the sliding suture plate are placed at both ends of the full-thickness wound, and are sutured to the skin around the full-thickness wound through the suture holes using sutures, and then the spring is installed.
[0064] In practical applications, multiple animal experimental skin wound slide bar type expansion fixators provided by this utility model can be used in combination for multiple wounds on the skin of experimental animals.
[0065] In practical applications, when experimental animals simulate the normal human healing process and the influence of the animal's suture membrane on wound healing is eliminated, only the spring needs to be removed.
[0066] The present application will be further explained in detail below with reference to embodiments. However, those skilled in the art should understand that these embodiments are provided for illustrative purposes only and are not intended to limit the present application.
[0067] Example
[0068] The embodiments of this application will be described in detail below with reference to examples. However, those skilled in the art will understand that the following examples are for illustrative purposes only and should not be construed as limiting the scope of this application. Unless otherwise specified in the examples, conventional conditions or conditions recommended by the manufacturer shall apply. This application should not be construed as being limited to the specific embodiments described.
[0069] Example 1
[0070] like Figures 1-4As shown, the present invention provides a sliding rod type expansion and fixation device for skin wounds in animal experiments, which mainly consists of a main shaft 1, a fixed suture plate 2, a sliding suture plate 3, a spring-loaded retaining bolt 4, and a spring 5.
[0071] The main shaft 1 is a cylindrical rod structure. The fixed stitching plate 2 is fixedly connected to one end of the main shaft 1. The spring retaining bolt 4 is fixedly connected to the other end of the main shaft 1. The sliding stitching plate 3 is provided with a sliding hole and forms a sliding connection based on the main shaft 1 passing through the sliding hole. The two ends of the spring 5 are respectively fixedly connected to the spring retaining bolt 4 and the sliding stitching plate 3, so that the sliding stitching plate 3 slides on the main shaft 1 based on the spring force.
[0072] Both the fixed suture plate 2 and the sliding suture plate 3 are provided with suture holes 6.
[0073] The spring retaining bolt 4 can be a conventional cylindrical bolt, consisting of a screw with a thread and a nut. To facilitate fixing the spring, the thread is used as the fixed connection point of the spring 5, and the spring 5 is fixed to the thread by the pull ring at the end of the spring 5.
[0074] The sliding stitching plate 3 is also provided with a spring retaining bolt 4, and one end of the spring 5 is fixedly connected to the spring retaining bolt 4 on the sliding stitching plate 3.
[0075] The fixed stitching plate 2 is provided with a screw 2-A, and the main shaft 1 is provided with a connecting hole. The screw 2-A is fixed by passing through the connecting hole and being limited by a nut.
[0076] The fixed suture plate 2 and the sliding suture plate 3 are provided with suture grooves 7 at the suture holes 6. The suture holes 6 provided on the sliding suture plate 3 are each provided with a suture groove 7 in the direction of each end of the main shaft.
[0077] The main shaft 1 has two connecting holes at different distances from the end of the spring retaining bolt 4. The connecting holes are used for the fixed connection of the spring retaining bolt 4, so that the position of the spring retaining bolt 4 can be adjusted, and it is convenient to replace the spring 5 with one of different lengths / models.
[0078] The above-mentioned method for applying a sliding bar-type expander fixator for skin wounds in animal experiments mainly includes the following steps:
[0079] (1) Cut and punch holes in the skin tissue of the experimental animal, cut and separate the adhered skin to form a rectangular full-thickness wound;
[0080] (2) After installing the spring, position the fixed suture plate and the sliding suture plate at both ends of the full-thickness wound, and use sutures to suture and fix them to the skin around the full-thickness wound through the suture hole;
[0081] Or,
[0082] The fixed suture plate and the sliding suture plate are placed at both ends of the full-thickness wound, and are sutured to the skin around the full-thickness wound through the suture holes using sutures, and then the spring is installed.
[0083] like Figure 5 As shown, the skin wound slide bar type expansion fixator for animal experiments described in Example 1 was used to fix the mouse.
[0084] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.
Claims
1. A skin wound slider-type expander fixator for animal experiments, characterized in that It is mainly composed of a main shaft body, a fixed suture plate, a sliding suture plate, a spring retaining bolt and a spring; The main shaft body is a cylindrical rod structure. The fixed suture plate is fixedly connected to the end of one end of the main shaft body. The spring retaining bolt is fixedly connected to the other end of the main shaft body. A sliding hole is provided on the sliding suture plate, and the sliding suture plate is slidably connected based on the main shaft body passing through the sliding hole. The two ends of the spring are respectively fixedly connected to the spring retaining bolt and the sliding suture plate, so that the sliding suture plate is limited to slide on the main shaft body based on the elastic force of the spring; Suture holes are provided on both the fixed suture plate and the sliding suture plate.
2. The skin wound slider type dilatation fixator for animal experiments according to claim 1, wherein: A spring retaining bolt is also provided on the sliding suture plate, and one end of the spring is fixedly connected to the spring retaining bolt on the sliding suture plate.
3. The skin wound slider type dilator and fixator for animal experiments according to claim 1, characterized in that: A screw rod is provided on the fixed suture plate, and a connection hole is provided on the main shaft body. The screw rod passes through the connection hole and is fixed in the form of a bolt limited by a nut.
4. The skin wound slide bar type expander fixator for animal experiments according to claim 1, wherein: The fixed suture plate and / or the sliding suture plate are provided with suture wire grooves at the suture holes.
5. The skin wound slide bar type expander fixator for animal experiments according to claim 4, characterized in that: A plurality of suture wire grooves are provided around the suture holes.
6. The skin wound slider-type expander fixator for animal experiments according to claim 3, characterized in that: A plurality of connection holes with different distances from the end are provided on the main shaft body.
7. The skin wound slider type expansion fixator for animal experiments according to claim 1, characterized in that: The spring is a constant force spring.
8. The skin wound slider type expander fixator for animal experiments according to claim 1, wherein: The fixed suture plate and the sliding suture plate are integrally formed parts.