CN107569296B - An animal experiment spreader - Google Patents

Abstract

The invention provides an animal experiment spreader, which includes two spreader rods and a connecting chassis. The upper ends of the two spreader rods are connected to form an adjustment part. The lower ends of the two spreader rods are opened outward to form a stretcher. the adjustment part is provided with a slot; the connecting chassis includes a shell and an adjustment component, the adjustment component is installed on the shell, the adjustment component includes two adjustment units that can move away from each other and approach each other relatively; the two spreading rods pass through the adjustment part The slot is installed between the two adjustment units, and the opening width of the expansion part is adjusted by the relative movement of the two adjustment units. In the animal experiment spreader of the present invention, since the adjustment part is provided with a slot, and the two spreader rods are installed between the two adjustment units through the slot, the spreader can be flexibly adjusted by controlling the relative movement of the two adjustment units. The opening width of the opening overcomes the problem that the traditional hook retractor cannot be flexibly adjusted to fully expose the incision, reduces the difficulty of experimental operations, and improves experimental efficiency.

Description

An animal experiment spreader

Technical field

The invention relates to the field of biological instruments, and in particular to an animal experimental spreader.

Background technique

When conducting animal experiments, staff often need to make thoracoabdominal incisions on the animals and expand the incisions so that surgical instruments or the staff's hands can be placed into the animal's body cavity for experiments. Currently, retractors are often used in experiments to pull the incisions apart. , to expand the field of view to facilitate experiments, but the shortcomings of using a hook retractor are also very obvious. The traditional retractor has a short and fixed opening length. When the incision is large or needs to be enlarged, the retractor cannot be flexibly adjusted according to experimental needs. The incision is completely exposed, which increases the difficulty of experimental operations and affects the efficiency of the experiment. In addition, when using the hook retractor, an assistant is required to be responsible for retracting the hook, which increases the work of the staff, takes up space on the experimental bench, and leads to a waste of human resources in the experiment.

Contents of the invention

In order to overcome the technical problem that the retractor cannot be flexibly adjusted to completely expose the incision, the present invention provides an animal experimental spreader, which can flexibly adjust the spreader's opening width according to experimental needs.

In order to achieve the above object, the animal experiment spreader provided by the present invention includes two spreader rods and a connecting chassis. The upper ends of the two spreader rods are connected to form an adjustment part. The lower ends of the two stretcher rods are Open outward to form a spreading portion; the adjustment portion is provided with a slot;

The connecting chassis includes a housing and an adjustment assembly. The adjustment assembly is installed on the housing. The adjustment assembly includes two adjustment units that can move relatively far away and close to each other; the two spreading rods pass through the adjustment part. The slot is installed between the two adjustment units, and the opening width of the expansion portion is adjusted by the relative movement of the two adjustment units.

Further, an inner cavity is provided in the middle of the housing; each adjustment unit includes a push plate and a rotatable threaded rod corresponding to the push plate, and the push plates of both adjustment units are Located in the inner cavity, the push plate and the threaded rod are evenly distributed on both sides of the adjustment part;

One end of the threaded rod passes through the housing and is connected to the outer wall of the push plate, and the inner wall of the push plate is clamped in the slot to be driven relative to it by the rotation of the threaded rod. The corresponding push plate moves in a direction closer to or away from the adjustment part, thereby closing the adjustment part inwardly or opening outward, thereby adjusting the opening width of the expansion part.

Further, each of the expansion rods includes a first expansion unit and a second expansion unit, the lower end of the first expansion unit is hollow, and the upper end of the second expansion unit is inserted into the third expansion unit. One opens the hollow cavity at the lower end of the unit;

A first fixing knob is provided at the lower end of the first expansion unit for adjusting the length of the upper end of the second expansion unit inserted into the hollow cavity at the lower end of the first expansion unit.

Further, the second expansion unit of each expansion rod includes a first expansion component and a second expansion component, the lower end of the first expansion component is hollow, and the upper end of the second expansion component is inserted into Installed in the hollow cavity at the lower end of the first expansion component;

A third fixing knob is provided at the lower end of the first expansion component for adjusting the length of the hollow cavity in which the upper end of the second expansion component is inserted into the lower end of the first expansion component.

Further, the first expansion component of each expansion rod includes a first connection part and a turning part, and the upper end of the first connection part is inserted into the hollow cavity at the lower end of the first expansion unit. , the lower end of the first connecting part is connected to the upper end of the turning part;

The lower end of the first connecting part is provided with a second fixed knob for adjusting the relative installation angle between the first connecting part and the turning part; the first connecting part is provided with a first scale.

Further, the first expansion component of each expansion rod also includes a bending part and a first blunt hook, the upper end of the bending part is connected to the lower end of the turning part, and the lower end of the bending part The first blunt-headed hook is provided, and the lower end of the curved portion is hollow; the first blunt-headed hook is fixed outward.

Further, the second expansion component of each expansion rod includes a second connection part and a second blunt hook, and the upper end of the second connection part is inserted into the hollow cavity at the lower end of the bending part. , the second blunt-headed hook is provided at the lower end of the second connecting part, and the second blunt-headed hook is fixed outward; the second connecting part is provided with a second scale.

Further, a lighting system is included, the lighting system includes a light bulb and an adjusting arm, the light bulb is installed on the lower end of the adjusting arm, and the upper end of the adjusting arm is installed on the connecting chassis.

Further, the connecting chassis further includes a connecting rod, a first circuit channel is provided in the connecting rod; a second circuit channel is provided in the adjusting arm; the first circuit channel is connected with the second circuit channel ; The light bulb is installed at the outlet of the second circuit channel.

Further, it also includes a fixed frame, the connecting chassis is installed on the fixed frame; the fixed frame includes a fixed rod and a fixed clip, the upper end of the fixed rod is connected to the connecting rod, and the lower end of the fixed rod Installed with said retaining clip.

The animal experimental spreader provided by the embodiment of the present invention has the following technical effects compared with the existing technology:

Since the adjustment part is provided with a slot, and the two expansion rods are installed between the two adjustment units through the slot, the opening width of the expansion part can be flexibly adjusted by controlling the relative movement of the two adjustment units, thereby overcoming the problem of It solves the problem that the traditional hook retractor cannot be flexibly adjusted to completely expose the incision, reduces the difficulty of experimental operations, and improves experimental efficiency.

Description of drawings

Figure 1 is a schematic structural diagram of an animal experimental spreader according to an embodiment of the present invention;

Figure 2 is a schematic structural diagram of an animal experiment spreader clamped on an animal experiment table according to an embodiment of the present invention;

Figure 3 is a schematic structural diagram of two spreading rods in an animal experimental spreader according to an embodiment of the present invention;

Figure 4 is an exploded schematic diagram of two spreading rods in an animal experimental spreader according to an embodiment of the present invention;

Figure 5 is a structural schematic diagram 2 of two spreading rods in an animal experimental spreader according to an embodiment of the present invention;

Figure 6 is a schematic structural diagram of two spreading rods in an animal experimental spreader according to an embodiment of the present invention;

Figure 7 is a schematic diagram of the first expansion unit of the two expansion rods in the embodiment of the present invention;

Figure 8 is a schematic view of the first expansion component of the two expansion rods in the embodiment of the present invention;

Figure 9 is a second schematic view of the first expansion component of the two expansion rods in the embodiment of the present invention;

Figure 10 is a schematic diagram of the second expansion component of the two expansion rods in the embodiment of the present invention;

Figure 11 is a top view of the connecting chassis in the embodiment of the present invention.

Among them, 1. Expansion rod, 11. First expansion unit, 111. Card slot, 112. First fixed knob, 12. First expansion component, 121. First scale, 122. First connection part , 123. Second fixed knob, 124. Turning part, 125. Bend part, 126. First blunt hook, 127. Third fixed knob, 13. Second expansion component, 131. Second scale, 132 , Second connection part, 133. Second blunt hook, 2. Lighting system, 21. Bulb, 22. Adjustment arm, 3. Fixing frame, 31. Fixing rod, 32. Fixing clip, 4. Connecting chassis, 41 , Adjustment component, 411. Threaded rod, 412. Push plate, 42. Connecting rod, 421. Fourth fixed knob, 43. First circuit channel, 44. Housing, 5. Animal experiment table.

Detailed ways

Specific implementations of the present invention will be described in further detail below with reference to the accompanying drawings and specific examples. The following examples are used to illustrate the invention but are not intended to limit the scope of the invention.

As shown in conjunction with Figures 1 to 11, an animal experiment spreader described in this embodiment includes two spreader rods 1 and a connecting chassis 4. The upper ends of the two spreader rods 1 are connected to form an adjustment part. The lower end of the expansion rod 1 opens outward to form a expansion part; the adjustment part is provided with a slot 111;

The connecting chassis 4 includes a housing 44 and an adjustment assembly 41. The adjustment assembly 41 is installed on the housing 44. The adjustment assembly 41 includes two adjustment units that can move relatively far away and close to each other; the two expansion rods 1 pass through the clamps on the adjustment part. The slot 111 is installed between the two adjustment units, and adjusts the opening width of the expansion part through the relative movement of the two adjustment units. Preferably, the adjustment part is made of elastic material;

Since the adjustment part is provided with a slot 111 and the two expansion rods 1 are installed between the two adjustment units through the slot 111, the opening width of the expansion part can be flexibly adjusted by controlling the relative movement of the two adjustment units. , thus overcoming the problem that the traditional hook retractor cannot be flexibly adjusted to completely expose the incision, reducing the difficulty of experimental operations and improving experimental efficiency.

As shown in Figures 2, 3, 4, 7, and 11, preferably, an inner cavity is provided in the middle of the housing 4; each adjustment unit includes a push plate 412 and a rotatable threaded rod corresponding to the push plate 412. 411. The push plates 412 of the two adjustment units are both located in the inner cavity. The push plates 412 and the threaded rods 411 are evenly distributed on both sides of the adjustment part; one end of the threaded rod 411 passes through the outer wall of the housing 4 and the push plate 412. connection, the inner wall of the push plate 412 is clamped in the slot 111, so that the rotation of the threaded rod 411 drives the corresponding push plate 412 to move closer to or away from the adjustment part, thereby closing the adjustment part inward or outward. Open, and then adjust the opening width of the expansion part.

Preferably, each expansion rod 1 includes a first expansion unit 11 and a second expansion unit, the lower end of the first expansion unit 11 is hollow, and the upper end of the second expansion unit is inserted into the first expansion unit 11 in the hollow cavity at the lower end of the first expansion unit 11; the lower end of the first expansion unit 11 is provided with a first fixed knob 112 for adjusting the length of the upper end of the second expansion unit inserted into the hollow cavity at the lower end of the first expansion unit 11 ;

By rotating the first fixed knob 112, the second expansion unit of the expansion rod is in an active state, and the length of the upper end of the second expansion unit inserted into the hollow cavity of the lower end of the first expansion unit 11 is adjusted, thereby adjusting the expansion. The length of rod 1.

Preferably, the second expansion unit of each expansion rod 1 includes a first expansion component 12 and a second expansion component 13. The lower end of the first expansion component 12 is hollow, and the upper end of the second expansion component 13 is inserted. In the hollow cavity at the lower end of the first expansion component 12; the lower end of the first expansion component 12 is provided with a third fixed knob 127 for adjusting the upper end of the second expansion component 13 to be inserted into the first expansion component 12 The length of the hollow cavity at the lower end;

By rotating the third fixed knob 127, the second expansion component 13 of the expansion rod is in an active state, and the length of the hollow cavity in which the upper end of the second expansion component 13 is inserted into the lower end of the first expansion component 12 is adjusted, thereby further adjusting Extend the length of rod 1.

As shown in Figures 5, 6, 8 and Figure 9, preferably, the first expansion component 12 of each expansion rod includes a first connecting part 122 and a turning part 124, and the upper end of the first connecting part 122 is inserted into the first connecting part 122. In a hollow cavity at the lower end of the expansion unit 11, the lower end of the first connecting part 122 is connected to the upper end of the turning part 124; The second fixing knob 123 for the installation angle; the first connecting part 122 is provided with a first scale 121;

Since the first connecting part 122 is provided with a scale 121, the length adjustment of the second expansion unit can be visualized; at the same time, the relative installation angle between the first connecting part 122 and the turning part 124 can be adjusted by rotating the second fixed knob 123. Thereby, the expansion width of the expansion part is expanded.

Preferably, the first expansion component 12 of each expansion rod also includes a bending part 125 and a first blunt hook 126. The upper end of the bending part 125 is connected to the lower end of the turning part 124, and the lower end of the bending part 125 is provided with The first blunt hook 126 has a hollow lower end of the curved portion 125; the first blunt hook 126 is fixed outward;

The bending part 125 can make the expansion part more sensitive to the force of the push plate 412, so that the expansion part can open to a larger angle under the same force; in addition, the lower end of the bending part 125 is provided with a first blunt hook 126 , can expand the space for expansion, and the outer wall of the blunt-ended hook is smooth, which can prevent the expansion device from causing damage to animal tissues during the process of opening the incision.

As shown in FIG. 10 , preferably, the second expansion component 13 of each expansion rod includes a second connection part 132 and a second blunt hook 133 , and the upper end of the second connection part 132 is inserted into the bending part 125 In the hollow cavity at the lower end of the second connecting part 132, a second blunt-headed hook 133 is provided at the lower end, and the second blunt-headed hook 133 is fixed outward; the second connecting part 132 is provided with a second scale 131;

Since the second connecting portion 132 is provided with a second scale 131, the length adjustment of the second expansion component can be visualized; and a second blunt hook 131 is provided at the lower end of the second connecting portion 132, which can further expand the expansion space.

As shown in Figure 1, preferably, it also includes a lighting system 2. The lighting system 2 includes a light bulb 21 and an adjusting arm 22. The light bulb 21 is installed on the lower end of the adjusting arm 22, and the upper end of the adjusting arm 22 is installed on the connecting chassis 4; the connecting chassis 4 also includes a connecting rod 42, which is provided with a first circuit channel 43; the adjusting arm 22 is provided with a second circuit channel; the first circuit channel 43 is connected with the second circuit channel; the light bulb 21 is installed in the second circuit channel the exit;

Since the bulb 21 is provided, and the adjusting arm 22 can be flexibly twisted by external force, the bulb 21 is fixed at a required angle and direction, thereby providing sufficient light source for the experiment and facilitating the experiment.

As shown in Figure 2, preferably, it also includes a fixed frame 3, and the connecting chassis 4 is installed on the fixed frame 3; the fixed frame 3 includes a fixed rod 31 and a fixed clip 32, the upper end of the fixed rod 31 is connected to the connecting rod 42, and the fixed rod 31 is connected to the connecting rod 42. A fixing clip 32 is installed at the lower end of 31;

Since the fixing clip 32 is provided, the spreader can be clamped on the experimental table, thereby reducing the work of the experimenter, improving the experimental efficiency, and reducing the waste of experimental human resources.

Preferably, the two end ports of the connecting rod 42 are hollow, and the upper end of the fixed rod 31 is inserted into the hollow cavity of the two end ports of the connecting rod 42. A fourth fixing knob 421 is provided at both end ports of the connecting rod 42 for Adjust the length of the upper end of the fixed rod 31 inserted into the hollow cavity of the two end ports of the connecting rod 42.

By rotating the fourth fixing knob 421, the fixing rod 31 is in an active state, and the length of the upper end of the fixing rod 31 inserted into the hollow cavity of the two end ports of the connecting rod 42 can be adjusted or the fixing frame 3 can be disassembled, thereby reducing the The animal experiment spreader takes up less space when stored and is easy to carry.

The working principle of the animal experimental spreader according to the embodiment of the present invention will be described in detail below with reference to Figures 1 to 11:

When performing animal experiments, first rotate the fourth fixing knob 421 to make the fixing rod 31 active, pull the fixing rod 31 outward to match the width of the experimental bench 5, and tighten the fourth fixing knob 421 to fix the connecting rod 42 with the Fix the relative spatial position of the rod 31, and then press the tail of the fixing clip 32 to open and clamp it on both sides of the experimental bench 5, thereby fixing the spreader on the experimental bench.

In animal experiments, after the animal's chest and abdomen are incised, the spreader is adjusted according to the size of the incision. When the surgical incision is small during the experiment, rotate the first fixed knob 112 to make the second expansion unit of the expansion rod active, use the first scale 121 to move the second expansion unit upward to an appropriate height, and increase the second expansion unit. The upper end of the expansion unit is inserted into the hollow cavity of the lower end of the first expansion unit 11, and then the first fixing knob 112 is tightened to fix the expansion rod between the first expansion unit 11 and the second expansion unit. Relative spatial position. If the length of the expansion rod 1 is still too long at this time, you can also rotate the third fixed knob 127 to make the second expansion component 13 of the expansion rod active, and use the second scale 131 to move the second expansion component 13 upward. When the height is reached to a suitable height, increase the length of the hollow cavity in which the upper end of the second expansion component 13 is inserted into the lower end of the first expansion component 12 or disassemble the second expansion component 13 to reduce the length of the expansion rod 1 . At the same time, by rotating the threaded rod 411 inward, the force of the push plate 412 on the slot 112 is increased, and the opening width of the expansion part is reduced, so that the expansion device is suitable for smaller incisions.

When it is necessary to increase the incision during the experiment, rotate the first fixed knob 112 to make the second expansion unit of the expansion rod active, and use the first scale 121 to move the second expansion unit downward to an appropriate height, reducing The upper end of the second expansion unit is inserted into the hollow cavity of the lower end of the first expansion unit 11, and then the first fixing knob 112 is tightened to fix the expansion rod between the first expansion unit 11 and the second expansion unit. relative spatial position between. If the length of the expansion rod 1 still cannot meet the experimental requirements at this time, you can also rotate the third fixed knob 127 to make the second expansion component 13 of the expansion rod active, and use the second scale 131 to move the second support downward. Open the component 13 to a suitable height, reduce the length of the hollow cavity in which the upper end of the second spreading component 13 is inserted into the lower end of the first spreading component 12, thereby increasing the length of the spreading rod 1. At the same time, by rotating the threaded rod 411 outward, the force of the push plate 412 on the slot 112 is reduced, and the opening width of the expansion part is increased. In addition, the first connecting part 122 can also be adjusted by rotating the second fixed knob 123 and the turning portion 124 to a suitable position, thereby further expanding the opening width of the expansion portion, thereby making the expansion device suitable for larger incisions.

During the experiment, the bulb 21 can be fixed at the required angle and direction by twisting the adjusting arm 22 to provide sufficient light source for the experiment. After the experiment is completed, the relative installation angle between the first connecting part 122 and the turning part 124 is adjusted to a suitable position by rotating the second fixing knob 123. At the same time, rotate the fourth fixing knob 421 to make the fixing rod 31 active, pull the fixing rod 31 inward, tighten the fourth fixing knob 421 to fix the relative spatial position of the connecting rod 42 and the fixing rod 31, or disassemble the fixing frame 3, reducing The space required for storage of the spreader makes it easy to carry.

In summary, the animal experimental spreader provided by the embodiment of the present invention mainly has the following advantages:

Since the adjustment part is provided with a slot 111 and the two expansion rods 1 are installed between the two adjustment units through the slot 111, the opening width of the expansion part can be flexibly adjusted by controlling the relative movement of the two adjustment units. , thus overcoming the problem that the traditional retractor cannot be flexibly adjusted to completely expose the incision, reducing the difficulty of experimental operations and improving experimental efficiency;

Adjust the relative installation angle between the first connecting part 122 and the turning part 124 to a suitable position by rotating the second fixed knob 123, thereby further expanding the expansion width of the expansion part; at the same time, by rotating the first fixed knob 112, the expansion rod The second expansion unit is in an active state. Adjust the length of the upper end of the second expansion unit inserted into the hollow cavity of the lower end of the first expansion unit 11 and rotate the third fixed knob 127 to expand the expansion rod for the second time. The component 13 is in an active state, and the upper end of the second expansion component 13 is inserted into the length of the hollow cavity at the lower end of the first expansion component 12 to adjust the length of the expansion rod 1, and the first connecting part 122 and the second The connecting portion 132 is provided with a first scale 121 and a second scale 131 respectively, so that the length adjustment of the expansion rod 1 can be visualized. Therefore, the animal experiment spreader provided in this embodiment can be used in animal experiments with different incision sizes, and is mainly suitable for small and medium-sized animals, such as rabbits, rats, etc.

In addition, the animal experiment spreader provided in this embodiment has a lighting system 2, which can be fixed at the required angle and direction by twisting the adjustment arm 22, which can provide sufficient light source during the experiment and facilitate the experiment. conduct. In the working state, the spreader can be fixed on the experimental table through the fixing clip 32, effectively replacing the hook puller, reducing the work of the experimenter, improving the experimental efficiency, and reducing the waste of experimental human resources; in the non-working state down, the fixing frame 3 can be disassembled to reduce space occupation and make it easy to carry.

It should be understood that the terms "first", "second", etc. are used in the present invention to describe various information, but the information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, "first" information may also be called "second" information, and similarly, "second" information may also be called "first" information.

The above are only preferred embodiments of the present invention. It should be noted that those of ordinary skill in the art can also make several improvements and substitutions without departing from the technical principles of the present invention. These improvements and substitutions It should also be regarded as the protection scope of the present invention.

Claims (7)

1. The animal experiment spreader is characterized by comprising two spreading rods, a connecting chassis and an illumination system, wherein the upper ends of the two spreading rods are connected to form an adjusting part, and the lower ends of the two spreading rods are outwards spread to form a spreading part; the adjusting part is provided with a clamping groove; the adjusting part is made of elastic materials;

the connecting chassis comprises a shell and an adjusting assembly, wherein the adjusting assembly is arranged on the shell and comprises two adjusting units which can be relatively far away from and close to each other; the two opening rods are arranged between the two adjusting units through clamping grooves on the adjusting parts, and the opening width of the opening parts is adjusted through the relative movement of the two adjusting units;

an inner cavity is formed in the middle of the shell; each adjusting unit comprises a push plate and a rotatable threaded rod corresponding to the push plates, the push plates of the two adjusting units are arranged in the inner cavity, and the push plates and the threaded rods are uniformly distributed on two sides of the adjusting part;

one end of the threaded rod penetrates through the shell to be connected with the outer side wall of the push plate, the inner side wall of the push plate is clamped in the clamping groove, and the push plate corresponding to the threaded rod is driven to move in a direction approaching or separating from the adjusting part by the rotary motion of the threaded rod, so that the adjusting part is closed inwards or opened outwards, and the opening width of the opening part is adjusted;

the lighting system comprises a bulb and an adjusting arm, wherein the bulb is arranged at the lower end of the adjusting arm, and the upper end of the adjusting arm is arranged on the connecting chassis; the connecting chassis further comprises a connecting rod, and a first circuit channel is arranged in the connecting rod; a second circuit channel is arranged in the adjusting arm; the first circuit channel is communicated with the second circuit channel; the bulb is mounted at the outlet of the second circuit path.

2. The animal experiment spreader of claim 1, wherein each spreader bar comprises a first spreader unit and a second spreader unit, the lower end of the first spreader unit is hollow, and the upper end of the second spreader unit is inserted into the hollow cavity of the lower end of the first spreader unit;

the lower end of the first stretching unit is provided with a first fixing knob for adjusting the length of the upper end of the second stretching unit, which is inserted into the hollow cavity at the lower end of the first stretching unit.

3. The animal experiment spreader of claim 2, wherein the second spreader unit of each spreader bar comprises a first spreader component and a second spreader component, the lower end of the first spreader component is hollow, and the upper end of the second spreader component is inserted into the hollow cavity of the lower end of the first spreader component;

the lower extreme of first struts the subassembly is equipped with the fixed knob of third for adjust the upper end cartridge of second struts the length of the cavity of the lower extreme of first struts the subassembly.

4. The animal experiment spreader of claim 3, wherein the first spreader assembly of each spreader bar comprises a first connection part and a turning part, the upper end of the first connection part is inserted into the hollow cavity of the lower end of the first spreader unit, and the lower end of the first connection part is connected with the upper end of the turning part;

the lower end of the first connecting part is provided with a second fixed knob for adjusting the relative installation angle between the first connecting part and the turning part; the first connecting part is provided with a first graduated scale.

5. The animal experiment spreader of claim 4, wherein the first spreader assembly of each spreader bar further comprises a curved portion and a first blunt hook, the upper end of the curved portion is connected with the lower end of the turning portion, the lower end of the curved portion is provided with the first blunt hook, and the lower end of the curved portion is hollow; the first blunt hook is fixed outward.

6. The animal experiment spreader of claim 5, wherein the second spreader assembly of each spreader bar comprises a second connection portion and a second blunt hook, an upper end of the second connection portion being inserted into a hollow cavity of a lower end of the curved portion, the lower end of the second connection portion being provided with the second blunt hook, the second blunt hook being fixed outward; and a second graduated scale is arranged on the second connecting part.

7. The animal experiment spreader of claim 1, further comprising a mount, the connection chassis being mounted on the mount;

the fixing frame comprises a fixing rod and a fixing clamp, wherein the upper end of the fixing rod is connected with the connecting rod, and the fixing clamp is installed at the lower end of the fixing rod.