Nursing injection teaching model with replaceable bionic blood vessel and bionic blood vessel replacement method

Abstract

The invention discloses a nursing injection teaching model with replaceable bionic blood vessels and a bionic blood vessel replacement method, and relates to the technical field of teaching models.The teaching model comprises a support, a bionic upper limb and arm model and a water tank, the bionic upper limb and arm model and the water tank are arranged on the support, and the bionic blood vessels are distributed in the bionic upper limb and arm model; a first connector and a second connector are arranged at the two ends of the bionic blood vessel respectively, the water tank is connected with a fiber catheter, and the fiber catheter is connected and communicated with the bionic blood vessel through the first connector and a third connector; meanwhile, according to the replacement method of the bionic blood vessel in the model, after a new bionic blood vessel is connected with an old bionic blood vessel, the old bionic blood vessel is drawn out to drive the new bionic blood vessel to enter a blood vessel installation hole channel, and replacement of the bionic blood vessel is completed. According to the injection teaching model, the bionic blood vessel can be quickly replaced and quickly connected with the fiber catheter after being replaced, so that the defect that the bionic blood vessel of a conventional injection teaching model cannot be replaced is overcome.

Description

Technical Field

[0001] The present application relates to the technical field of teaching models, and in particular to a nursing injection teaching model with replaceable bionic blood vessels and a bionic blood vessel replacement method. Background Art

[0002] Intravenous injection is a medical method in which liquid substances such as blood, medicine, and nutrient solution are injected directly into the vein. The injection sites are generally the basilic vein, median vein, cephalic vein in the antecubital fossa, or the superficial veins on the back of the hand, back of the foot, and ankle.

[0003] The reasons for failure of intravenous injection are as follows: 1. After the needle enters the subcutaneous tissue, it fails to "draw blood at once". Repeated punctures along the vein may scratch the blood vessel wall, causing the injected drug to overflow and causing local swelling and pain; 2. The depth of the vein is not explored before puncture, and the needle is inserted too deeply, penetrating the opposite blood vessel wall; 3. Blood can be seen returning after puncture, but after loosening the tourniquet, no blood returns when blood is drawn again. If the drug is injected, the local area will bulge and cause pain. The reason is that the insertion is too shallow. When the tourniquet is loosened, the vein retracts, causing the needle to fall out and the drug to be injected subcutaneously.

[0004] In response to the above-mentioned problem of intravenous injection failure, the existing published authorized patent CN110718130B, the patent name is a model of intravenous injection for nursing teaching, which discloses a telescopic support frame, the upper surface of the telescopic support frame is provided with a groove, the inner part of the groove is rotatably connected to the shoulder bending rod, one end of the shoulder bending rod is fixedly connected to the upper arm support rod, one end of the upper arm support rod is fixedly connected to the turntable, the outer surfaces of the upper arm support rod and the forearm support rod are fixedly connected to bionic muscles, the interior of the bionic muscle is paved with bionic fiber blood vessels, the upper end of the bionic fiber blood vessels is fixedly connected to a fiber catheter, and the surface of the fiber catheter is fixedly connected to a laser spotlight. The intravenous injection model for nursing teaching, through the coordinated setting of bionic fiber blood vessels, fiber catheters and laser spotlights, during the teaching process, the light source of the laser spotlight enters the bionic fiber blood vessels along the fiber catheter, which plays the role of highlighting the bionic fiber blood vessels, making it convenient for nurses to clearly check their own mistakes after each practice, thereby improving the pertinence of teaching practice.

[0005] The above patent is the same as the vast majority of existing intravenous injection models. Since the model blood vessels are different from human blood vessels, the model blood vessels have no self-healing ability. During model training, the blood vessel model needs to be repeatedly punctured with an intravenous needle. Over time, the blood vessel model will be damaged and unusable. However, the blood vessels of traditional intravenous injection models cannot be replaced. Therefore, after the blood vessel model is damaged and unusable, the entire intravenous injection model will be abandoned, resulting in a waste of resources and an increase in training costs in disguise. Summary of the invention

[0006] The main purpose of this application is to provide a bionic blood vessel replaceable nursing injection teaching model and a bionic blood vessel replacement method, aiming to solve the problem that the traditional injection training model cannot replace the blood vessel model.

[0007] The technical solution adopted in this application is as follows: First aspect: A bionic blood vessel replaceable nursing injection teaching model, comprising: A bracket; A bionic upper limb arm model, which is arranged on the bracket, and a blood vessel installation hole channel with the same extension direction as the injection vein is arranged in the bionic upper limb arm model, and both ends of the blood vessel installation hole channel penetrate to the outside of the bionic upper limb arm model; A bionic blood vessel, which is movably arranged along the blood vessel installation hole channel, and both ends of the bionic blood vessel extend into the blood vessel installation hole channel. First connecting heads and second connecting heads that can be docked with each other are respectively arranged at both ends of the bionic blood vessel, and the first connecting head and the second connecting head are in a sealed state when not docked; A water tank, which is provided with a fiber conduit, and the fiber conduit is provided with a third connecting head having the same structure as the second connecting head and capable of docking with the first connecting head. The fiber conduit and the bionic blood vessel are connected through the first connecting head and the third connecting head.

[0008] Optionally, both the second connecting head and the third connecting head include: A joint housing A, both ends of the joint housing A are respectively a docking end A and a pipe connection end A. An external thread is provided on the outer wall of one side of the docking end A, and a variable diameter inner hole A is arranged along the axial direction of the joint housing A; A sealing convex head, which is movably arranged in the variable diameter inner hole A and is located on one side of the docking end A. When the sealing convex head is pressed, it can retract into the variable diameter inner hole A to open the variable diameter inner hole A; A spring A, which is fixed in the variable diameter inner hole A to apply an elastic force to seal the variable diameter inner hole A to the sealing convex head.

[0009] Optionally, the first connecting head includes: A joint housing B, both ends of the joint housing B are respectively a docking end B and a pipe connection end B. A threaded sleeve is slidably arranged on the outer wall of one side of the docking end B. The threaded sleeve can be threadedly connected with the docking end A, and a variable diameter inner hole B is arranged along the axial direction of the joint housing B; A sealing flat head, which is movably arranged in the variable diameter inner hole B and is located on one side of the docking end B. When the sealing flat head is pressed, it can retract into the variable diameter inner hole B to open the variable diameter inner hole B; A spring B is fixed in the variable diameter inner hole B to apply elastic force to the sealing flat head to seal the variable diameter inner hole B.

[0010] Optionally, when the first connector is docked with the second connector or the third connector, the sealing flat head is opposite to the sealing convex head, and when the threaded sleeve is screwed in along the docking end A, the sealing convex head and the sealing flat head are simultaneously pressed back into the variable diameter inner hole A and the variable diameter inner hole B.

[0011] Optionally, a sealing ring A is provided between the sealing boss and the joint housing A.

[0012] Optionally, a sealing ring B is provided between the sealing flat head and the joint housing B.

[0013] Optionally, sealing grooves for installing end face sealing rings are provided on the end faces where the butt end A and the butt end B are connected to each other.

[0014] Optionally, the sealing flat head is provided with a docking groove that cooperates with the sealing convex head.

[0015] Second aspect: A bionic blood vessel replacement method for a nursing injection teaching model with replaceable bionic blood vessels, comprising: Stopping the water tank from supplying water to the fiber conduit; Separating the used bionic blood vessel from the fiber conduit; docking the first connector of the unused bionic blood vessel with the second connector of the used bionic blood vessel; The used bionic blood vessel is pulled out by holding one end of the first connector of the used bionic blood vessel, and the unused bionic blood vessel moves along with the used bionic blood vessel and is replaced into the blood vessel installation channel; After the used bionic blood vessel is completely pulled out of the blood vessel installation channel, the unused bionic blood vessel is separated from the used bionic blood vessel, and the first connector of the unused bionic blood vessel is connected to the third connector on the fiber catheter.

[0016] Compared with the prior art, the beneficial effects of this application are: First: The application proposes a nursing injection teaching model with a replaceable bionic blood vessel. By designing the bionic blood vessel as a replaceable structure, it is possible to replace the old bionic blood vessels damaged by long-term puncture use, thereby avoiding the entire injection teaching model from being scrapped and discarded, thereby greatly reducing the training cost. In addition, a first connector and a second connector are designed at both ends of the bionic blood vessel, and a third connector is designed for the fiber catheter, which can realize the rapid replacement of the bionic blood vessel and the rapid connection with the fiber catheter after replacement.

[0017] Second: The present application also proposes a method for replacing the bionic blood vessel of a bionic blood vessel replaceable nursing injection teaching model, which is simple to operate and can quickly realize the rapid replacement of the bionic blood vessel and the rapid connection with the fiber catheter after replacement, thus breaking the drawback that the conventional injection teaching model cannot replace the bionic blood vessel. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. is a schematic structural diagram of the bionic blood vessel replaceable nursing injection teaching model provided by the embodiment of the present application; Figure 2 is Figure 1 an enlarged view of part A in Figure 3 FIG. is a schematic structural diagram of the bionic blood vessel; Figure 4 FIG. is a schematic structural diagram of the first connector; Figure 5 FIG. is a sectional schematic diagram of the first connector; Figure 6 FIG. is a schematic structural diagram of the second connector; Figure 7 FIG. is a sectional structural schematic diagram of the second connector; Figure 8 FIG. is a connection schematic diagram of the first connector and the second connector.

[0019] Explanation of the reference numerals in the drawings: 1 - support, 2 - base, 3 - water tank, 4 - fiber catheter, 5 - bionic upper limb arm model, 6 - bionic blood vessel, 7 - first connector, 701 - connector housing B, 702 - docking end B, 703 - pipe connection end B, 704 - stepped bore B, 705 - sealing flat head, 706 - spring B, 707 - sealing ring B, 708 - threaded sleeve, 8 - second connector, 801 - connector housing A, 802 - docking end A, 803 - pipe connection end A, 804 - stepped bore A, 805 - sealing projection, 806 - spring A, 807 - sealing ring A, 9 - third connector, 10 - pressure regulating valve, 11 - sealing groove, 12 - end face sealing ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0021] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0022] In the present application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0023] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or the solution where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0024] Referring to the attached Figure 1 As shown, the embodiments of the present application provide a bionic blood vessel replaceable nursing injection teaching model, including a bracket 1. The bracket 1 is a telescopic structure. Conventionally, the bracket 1 can adopt an electric telescopic rod structure. Of course, it can also adopt a structure of a group of rod bodies that are movably inserted into each other and fixed by locking screws. It can be understood that through the telescopic setting of the bracket 1, the entire teaching model has the effect of adjustable height, thus facilitating intravenous injection practice for learners of different heights. The bottom end of the bracket 1 is fixedly connected to a base 2. The base 2 is configured with rollers with brake pads, which is convenient to move this model to a suitable position and lock it. A water tank 3 is arranged on the base 2. A water pump is arranged in the water tank 3. The water pump is connected to a fiber conduit 4, and a pressure regulating valve 10 is installed on the fiber conduit 4. The top end of the bracket 1 is rotatably installed with a bionic upper limb arm model 5. The rotatable installation of the bionic upper limb arm model 5 and the bracket 1 facilitates the learner to lift and place the bionic upper limb arm model 5. The bionic upper limb arm model 5 can specifically refer to the background patent, and its structure will not be elaborated here.

[0025] In this embodiment, a blood vessel installation channel is arranged inside the bionic upper limb arm. The blood vessel installation channel has the same direction as a certain injection vein in the human body, such as the basilic vein or the cephalic vein. In this application, the cephalic vein is taken as an example. Both ends of the blood vessel installation channel penetrate to the outside of the bionic upper limb arm model 5. A bionic blood vessel 6 is movably arranged in the blood vessel installation channel. Both ends of the bionic blood vessel 6 extend into the blood vessel installation channel to facilitate the connection of other structures at both ends of the bionic blood vessel 6.

[0026] As Figures 1 to 3 shown, a first connector 7 and a second connector 8 that can be docked with each other are respectively arranged at both ends of the bionic blood vessel 6. At the same time, a third connector 9 is arranged at the end of the fiber catheter 4 away from the water tank 3. The third connector 9 has the same structure as the second connector 8 and can also be connected to the first connector 7, so as to connect the fiber catheter 4 and the bionic blood vessel 6. The pressure in the fiber catheter 4 can be adjusted by using the pressure regulating valve 10, thereby controlling the filling state of the liquid inside the bionic blood vessel 6, playing a role in simulating the fullness of the venous blood vessels of different patients, and improving the authenticity of teaching training. This implementation method can refer to the background patent.

[0027] In the above, as Figure 4 and Figure 5As shown in the figure, the first connector 7 includes a connector housing B701, a sealing flat head 705, and a spring B706. The maximum outer diameter of the connector housing B701 is the same as the outer diameter of the bionic blood vessel 6, ensuring that the first connector 7 can pass through the blood vessel installation hole. The two ends of the connector housing B701 are respectively a docking end B702 and a pipe connection end B703. The docking end B702 is connected to the second connector 8 or the third connector 9, and the pipe connection end B703 is inserted into the bionic blood vessel 6 in a nested manner. A threaded sleeve 708 is slidably arranged on the outer wall of the docking end B702. The threaded sleeve 708 has internal threads and is used for threaded connection with the second connector 8 or the third connector 9. At the same time, a stepped internal hole B704 is axially arranged in the connector housing B701. There is a section in the stepped internal hole B704 where the inner cavity diameter gradually increases from the docking end B702 side to the pipe connection end B703 side. The sealing flat head 705 is movably arranged in the stepped internal hole B704 and is located on the docking end B702 side. A sealing ring B707 is arranged between the outer wall of the sealing flat head 705 and the inner wall of the stepped internal hole B704, and the stepped internal hole B704 in the natural state is sealed by the sealing ring B707. In addition, a shoulder is integrally formed in the stepped internal hole B704, and a spring B706 is fixedly installed on the shoulder. The spring B706 is fixedly connected to the sealing flat head 705. In the natural state, the spring B706 exerts an elastic force on the sealing flat head 705 to seal the stepped internal hole B704. When the sealing flat head 705 is pressed, the spring B706 is compressed, and the sealing flat head 705 retracts into the stepped internal hole B704 to open the stepped internal hole B704. After the sealing flat head 705 loses pressure, the spring B706 resets the sealing flat head 705 to block the stepped internal hole B704, so that the first connector 7 is in a sealed state in the natural state.

[0028] As Figure 6 and Figure 7 shown in the figure, the second connector 8 and the third connector 9 have the same structure and both include a connector housing A801, a sealing convex head 805, and a spring A806. The maximum outer diameter of the connector housing A801 is the same as the outer diameter of the bionic blood vessel 6, ensuring that the second connector 8 can also pass through the blood vessel installation hole. The two ends of the connector housing A801 are respectively a docking end A802 and a pipe connection end A803. The docking end A802 is used for connection with the docking end B702, and the pipe connection end A803 is inserted into the bionic blood vessel 6 in a nested manner. External threads are arranged on the outer wall of the docking end A802. When the docking end A802 and the docking end B702 need to be connected, the threaded sleeve 708 can be screwed onto the docking end A802.

[0029] Meanwhile, the joint housing A is axially provided with a stepped inner hole A804. There is a section where the inner cavity diameter gradually increases from the docking end A802 side to the pipe connection end A803 side of the stepped inner hole A804. The sealing boss 805 is movably arranged in the stepped inner hole A804 and is located on the docking end A802 side. A sealing ring A807 is arranged between the outer wall of the sealing boss 805 and the inner wall of the stepped inner hole A804. The sealing boss 805 seals the stepped inner hole A804 by using the sealing ring A807. An annular shoulder is integrally formed in the stepped inner hole A804, and a spring A806 is fixedly installed on the annular shoulder. The spring A806 is fixedly connected to the sealing boss 805. In the natural state, the spring A806 applies an elastic force to the sealing flat boss to seal the stepped inner hole A804. When the sealing boss 805 is pressed, the spring A806 is compressed, and the sealing boss 805 retracts into the stepped inner hole A804 to open the stepped inner hole A804. After the sealing boss 805 loses pressure, the spring A806 resets the sealing boss 805 to block the stepped inner hole A804, so that the second joint 8 and the third joint 9 are in a sealed state in the natural state. Of course, it should be noted here that the outer diameter of the protruding part of the sealing boss 805 is smaller than the inner diameter of the stepped inner hole A804.

[0030] Based on the structures of the first joint 7, the second joint 8 and the third joint 9, it can be imagined that, as Figure 8 shown, when the first joint 7 is docked with the second joint 8 or the third joint 9, the sealing boss 805 is aligned with the sealing flat head 705. Of course, for the convenience of coaxially aligning the sealing boss 805 and the sealing flat head 705, a docking groove is provided on the docking end face of the sealing flat head 705, which is convenient for the sealing boss 805 to be inserted into the docking groove to quickly coaxially align with the sealing flat head 705. Then, the threaded sleeve 708 is screwed towards the docking end A802 side, and the threaded sleeve 708 will bring the joint housing B701 closer to the joint housing A801. During the approaching process, the sealing boss 805 and the sealing flat head 705 are pressed against each other, and then they respectively retract into the stepped inner hole A804 and the stepped inner hole B704 after being pressed. Thus, while the joints are connected to each other, the joints are electrically connected to each other. It can be imagined that during the installation process of the bionic blood vessel 6, the first joint 7 and the third joint 9 are electrically connected, and the second joint 8 is in a sealed state. The liquid entering the bionic blood vessel 6 has a fullness degree, which plays a role in simulating the fullness degree of the venous blood vessels of different patients and improves the authenticity of teaching training.

[0031] Of course, in the above, after the first joint 7 and the third joint 9 are electrically connected, to prevent the liquid from leaking from the docking surface between the first joint 7 and the second joint 8, as Figure 4 and Figure 6 shown, sealing grooves 11 are provided on the docking end faces where the docking end A802 and the docking end B702 are docked with each other, and end face sealing rings 12 are installed in the sealing grooves 11 to form a seal.

[0032] Based on the above, the embodiments of the present application further provide a method for replacing the bionic blood vessel of the bionic blood vessel replaceable nursing injection teaching model, including the following steps: S1: Stop the water tank 3 from supplying water to the fiber catheter 4; S2: Separate the third connector 9 on the fiber catheter 4 from the first connector 7 on the used bionic blood vessel 6, so as to remove the used bionic blood vessel 6 from the fiber catheter 4; S3: Take an unused bionic blood vessel 6, and connect the first connector 7 of the unused bionic blood vessel 6 to the second connector 8 of the used bionic blood vessel 6; S4: After the new and old bionic blood vessels 6 are connected, hold one end of the first connector 7 of the used bionic blood vessel 6, and draw out the used bionic blood vessel 6 from the blood vessel installation hole. The unused bionic blood vessel 6 will move with the used bionic blood vessel 6 and be replaced into the blood vessel installation hole; S5: After the used bionic blood vessel 6 is completely drawn out, separate the second connector 8 of the used bionic blood vessel 6 from the first connector 7 of the unused bionic blood vessel 6. At the same time, connect the removed first connector 7 of the unused bionic blood vessel 6 to the third connector 9 of the fiber catheter 4 to complete the replacement of the bionic blood vessel 6.

[0033] It is not difficult to find that due to the material characteristics of the bionic blood vessel and the small aperture and non-linear path of the blood vessel installation hole, it is difficult to directly pass the bionic blood vessel through the blood vessel installation hole. In this replacement method, when replacing the bionic blood vessel for the first time, the unused bionic blood vessel is connected to the bionic blood vessel prefabricated in the bionic upper limb arm initially, and the blood vessel replacement is completed by the way of pulling and replacing. For each subsequent replacement, the first connector and the second connector of the unused bionic blood vessel and the used bionic blood vessel are docked, and by pulling out the used bionic blood vessel, the unused bionic blood vessel can be pulled into the blood vessel installation hole to complete the rapid replacement of the new bionic blood vessel, which is very convenient. Moreover, since one end of the new bionic blood vessel is connected to the fiber catheter and is in a conducting state, while the other end of the new bionic blood vessel is sealed by the second connector in a natural state, there will be no leakage when the water tank is opened to make the bionic blood vessel in a full state.

[0034] It should be noted that each bionic upper limb arm can only be used for a certain injection vein, which is beneficial to replacing the waste bionic blood vessel. Of course, it is not difficult to imagine that although the existing injection teaching training model has multiple types of veins, since the bionic blood vessel cannot be replaced, once the blood vessel is damaged, the whole model is scrapped. Although each bionic upper limb arm of this model has only one injection vein, the injection vein can be replaced and used. Even if multiple bionic upper limb arms are required to train different veins, compared with replacing one by one for the existing models, the training cost is still lower.

[0035] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A bionic blood vessel replaceable nursing injection teaching model, characterized in that, Comprising: A bracket; A bionic upper limb arm model, which is arranged on the bracket, and a blood vessel installation hole channel with the same extension direction as the injection vein is arranged in the bionic upper limb arm model, and both ends of the blood vessel installation hole channel penetrate to the outside of the bionic upper limb arm model; A bionic blood vessel, which is movably arranged along the blood vessel installation hole channel, and both ends of the bionic blood vessel extend into the blood vessel installation hole channel. First connecting heads and second connecting heads that can be docked with each other are respectively arranged at both ends of the bionic blood vessel, and the first connecting head and the second connecting head are in a sealed state when not docked; A water tank, the water tank is provided with a fiber conduit, the fiber conduit is provided with a third connecting head having the same structure as the second connecting head and capable of docking with the first connecting head, and the fiber conduit and the bionic blood vessel are connected through the first connecting head and the third connecting head.

2. The bionic blood vessel replaceable nursing injection teaching model according to claim 1, characterized in that, Both the second connecting head and the third connecting head include: A joint housing A, both ends of the joint housing A are respectively a docking end A and a pipe connection end A, an external thread is arranged on the outer wall of one side of the docking end A, and a variable diameter inner hole A is arranged along the axial direction of the joint housing A; A sealing convex head, which is movably arranged in the variable diameter inner hole A and is located on one side of the docking end A, and when the sealing convex head is pressed, it can retract into the variable diameter inner hole A to open the variable diameter inner hole A; A spring A, which is fixed in the variable diameter inner hole A to apply an elastic force to seal the variable diameter inner hole A to the sealing convex head.

3. The bionic blood vessel replaceable nursing injection teaching model according to claim 2, characterized in that, The first connecting head includes: A joint housing B, both ends of the joint housing B are respectively a docking end B and a pipe connection end B, a threaded sleeve is slidably arranged on the outer wall of one side of the docking end B, the threaded sleeve can be threadedly connected with the docking end A, and a variable diameter inner hole B is arranged along the axial direction of the joint housing B; A sealing flat head, which is movably arranged in the variable diameter inner hole B and is located on one side of the docking end B, and when the sealing flat head is pressed, it can retract into the variable diameter inner hole B to open the variable diameter inner hole B; A spring B, which is fixed in the variable diameter inner hole B to apply an elastic force to seal the variable diameter inner hole B to the sealing flat head.

4. The bionic blood vessel replaceable nursing injection teaching model according to claim 3, characterized in that, When the first connecting head is docked with the second connecting head or the third connecting head, the sealing flat head and the sealing convex head are facing each other. When the threaded sleeve is screwed into the docking end A, the sealing convex head and the sealing flat head are simultaneously pressed and retract into the variable diameter inner hole A and the variable diameter inner hole B.

5. The bionic blood vessel replaceable nursing injection teaching model according to claim 2, wherein, A sealing ring A is arranged between the sealing convex head and the joint housing A.

6. The bionic blood vessel replaceable nursing injection teaching model according to claim 3, characterized in that, A sealing ring B is arranged between the sealing flat head and the joint housing B.

7. The bionic blood vessel replaceable nursing injection teaching model according to claim 3, characterized in that, Sealing grooves for installing end face sealing rings are arranged on the end faces where the docking end A and the docking end B are docked.

8. The bionic blood vessel replaceable nursing injection teaching model according to claim 3, characterized in that, The sealing flat head is provided with a docking groove for cooperating with the sealing convex head.

9. The method for replacing the bionic blood vessel of the bionic blood vessel replaceable nursing injection teaching model according to any one of claims 1 to 8, characterized in that, Including: Stop the water tank from supplying water to the fiber conduit; Separate the used bionic blood vessel from the fiber conduit; Dock the first connecting head of the unused bionic blood vessel with the second connecting head of the used bionic blood vessel; Pull out the used bionic blood vessel from one end of the first connector of the used bionic blood vessel, and the unused bionic blood vessel moves with the used bionic blood vessel and is replaced into the blood vessel installation channel; After the used bionic blood vessel is completely withdrawn from the blood vessel installation channel, separate the unused bionic blood vessel from the used bionic blood vessel, and connect the first connector of the unused bionic blood vessel to the third connector on the fiber catheter.

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