Multipurpose injection device under medical endoscope

Abstract

The invention relates to the technical field of medical injection, in particular to a multipurpose injection device under a medical endoscope. Comprising a fixing frame; the injector is arranged on the fixing frame, the injector is filled with a medical medium, a push rod is slidably connected in the injector, and the injector is fixedly connected and communicated with an injection tube; the multiple friction blocks are arranged at intervals and fixedly connected to the fixing frame, the friction blocks are used for stabilizing the injector, and the end, away from the injector, of the injection tube is fixedly connected and communicated with an injection needle; the isolation mechanism is arranged on the side, away from the injector, of the injection tube and used for isolating the injection needle. The friction block is extruded by the injector and deformed, and the injector is fixed by utilizing the deformation of the friction block, so that the stability of an injection needle in the subsequent injection working process is ensured, and the injection effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of medical injection, and in particular to a multi-purpose injection device under medical endoscope. Background Art

[0002] The endoscopic injection device is a medical device that is mainly used in various scenarios such as diagnosis and treatment during endoscopic examinations, applications in endoscopic surgical operations, targeted treatment under endoscopic navigation, and endoscopic-assisted diagnosis. The endoscopic injection device is usually composed of a long tube, an injection needle and other components, and can complete the injection of local diseased tissues of patients under precise endoscopic positioning. This type of device has greatly broadened the application scope of endoscopic diagnosis and treatment technology.

[0003] Existing endoscopic injection devices usually rely solely on medical staff to hold and fix them. As a result, when the injection needle is inserted into the patient's diseased tissue and during the injection process, the medical staff is likely to transfer their own shaking to the injection hose, causing the hose (injection needle) to shake, making it difficult for the injection needle to penetrate into a specific position on the diseased tissue, and even causing the needle to accidentally detach from the diseased tissue, which seriously affects the normal progress of the injection work. Summary of the invention

[0004] In order to overcome the disadvantage that the existing injection device can only be held firmly by medical staff, which may cause it to shake easily during the injection process and affect normal injection, the present invention provides a multi-purpose injection device under medical endoscopy.

[0005] The technical implementation scheme of the present invention is: a multi-purpose injection device for medical endoscopy, comprising: a fixed frame; a syringe, which is arranged on the fixed frame, the syringe is filled with a medical medium, a push rod is slidably connected to the syringe, and the syringe is fixedly connected and connected to an injection tube; a plurality of friction blocks, which are arranged at intervals and fixedly connected to the fixed frame, the friction blocks are used to stabilize the syringe, and one end of the injection tube away from the syringe is fixedly connected and connected to an injection needle; an isolation mechanism, which is arranged on the side of the injection tube away from the syringe and is used to isolate the injection needle.

[0006] Furthermore, it is particularly preferred that an angle exists between the axis of the friction block and an adjacent normal line on the injection tube, so as to stabilize the injection tube.

[0007] In addition, it is particularly preferred that the isolation mechanism includes: an isolation sleeve fixedly connected to the injection tube, the isolation sleeve is made of soft material, and the isolation sleeve is provided with a first through hole; a connecting ring fixedly connected to the isolation sleeve; a first steel wire, one end of which is fixedly connected to the connecting ring; and a transmission assembly arranged on the injection tube for deforming the isolation sleeve.

[0008] Furthermore, it is particularly preferred that the insulating sleeve is provided with a convex ring, the convex ring is used to support the insulating sleeve, and the injection needle guides the convex ring.

[0009] In addition, it is particularly preferred that the transmission assembly includes: a transmission shell, fixedly connected to the injection tube, the first steel wire is tightly fitted with the transmission shell, and the transmission shell is provided with a boss; a sliding ring is slidably connected in the transmission shell, and the boss of the transmission shell is used to limit the sliding ring, the sliding ring is fixedly connected to the other end of the first steel wire, a first elastic element is fixedly connected between the sliding ring and the transmission shell, a second elastic element is fixedly connected in the injection tube, a second through hole is provided on the second elastic element, and the second through hole on the second elastic element is initially in a blocked state, that is, the second elastic element has elastic force, and the second elastic element is initially compressed, the injection tube is provided with a first channel, the first channel is connected to the transmission shell, and the first channel and the sliding ring are respectively located on both sides of the boss on the transmission shell.

[0010] Furthermore, it is particularly preferred that the elastic coefficient of the second elastic element is greater than the elastic coefficient of the first elastic element, so as to enable the injection needle to work again after the isolation sleeve is compressed.

[0011] In addition, it is particularly preferred that the transmission housing is sealingly and slidingly connected to the endoscope to seal the endoscope.

[0012] In addition, it is particularly preferred that it also includes: a walking bag, fixedly connected to the injection tube, the walking bag is made of soft material, the walking bag is filled with a fluid medium, the fixed connection area between the walking bag and the injection tube is smaller than the area covered by the walking bag of the injection tube, a second steel wire is fixedly connected between the walking bag and the sliding ring, the second steel wire is tightly fitted with the transmission housing, the injection tube is provided with a second channel, the second channel is connected to the walking bag, and a third elastic element is installed in the second channel.

[0013] In addition, it is particularly preferred that the outer side of the walking bag is configured as a rough surface to increase the friction between the walking bag and the injection tube.

[0014] In addition, it is particularly preferred that the walking bag is provided with a groove, and the groove is used to accommodate the second steel wire, so as to stabilize the walking bag circumferentially.

[0015] In addition, it is particularly preferred that it also includes: a plurality of liquid outlet parts arranged circumferentially, all fixedly connected to the transmission shell, the transmission shell is filled with fluid medium, the liquid outlet part is provided with a third through hole, the transmission shell is provided with a liquid injection part, and the liquid outlet part and the liquid injection part are both made of soft material.

[0016] In addition, it is particularly preferred that the longest distance of the projection of the injection piece on the horizontal plane is smaller than the width of the sliding ring, so as to seal the injection piece.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention squeezes the friction block through the syringe and deforms it, and utilizes the deformation of the friction block to "fix" the syringe, thereby ensuring the stability of the injection needle during the subsequent injection process and improving the injection effect; the injection needle is wrapped with an isolation sleeve, thereby preventing the patient's body fluid entering the endoscope from contaminating the injection needle, thereby reducing the patient's body fluid that adheres to the injection needle when the injection needle is subsequently inserted into the patient's lesion target, ensuring the cleanliness of the injection needle during injection, so that the patient's lesion target is in a relatively clean environment during the injection process, thereby improving the injection effect; the injection tube drives the injection needle through the rolling walking bag, thereby preventing medical staff from using the "whole" injection tube to drive the injection needle to move, thereby causing the injection needle to swing during the insertion process, thereby allowing the injection needle to stably and accurately insert the patient's lesion target, thereby improving the injection effect; the patient's lesion target is cleaned by the fluid medium in the transmission housing, thereby removing mucus, secretions or other impurities at the patient's lesion target site, thereby providing a clearer observation field for medical staff, thereby improving the accuracy of the injection position. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 It is a three-dimensional structural schematic diagram of the fixing frame, the syringe and the push rod of the present invention; Figure 3 It is a three-dimensional structural cross-sectional view of the fixing frame and the syringe of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the transmission housing, the walking bag and the second steel wire of the present invention; Figure 5 It is a three-dimensional structural cross-sectional view of the transmission housing and the traveling bag of the present invention; Figure 6 It is a three-dimensional structural cross-sectional view of the insulating sleeve of the present invention when it is deformed; Figure 7 It is a three-dimensional structural cross-sectional view of the walking bag of the present invention; Figure 8 For the present invention Figure 5 A magnified view of the three-dimensional structure at center A; Fig. 9 The figure is a three-dimensional exploded view of the injection tube and its parts of the present invention; Fig.10 It is a schematic diagram of the three-dimensional structure when the sliding ring of the present invention compresses the first elastic element.

[0019] Marked in the figure: 101-endoscope, 1-fixed frame, 2-syringe, 3-push rod, 4-injection tube, 5-friction block, 6-injection needle, 701-isolating sleeve, 702-connecting ring, 703-first steel wire, 8-convex ring, 901-transmission shell, 902-sliding ring, 903-first elastic element, 904-second elastic element, 905-first channel, 1001-walking bag, 1002-second steel wire, 1003-second channel, 1004-third elastic element, 11-groove, 1201-liquid outlet, 1202-liquid injection part. DETAILED DESCRIPTION

[0020] In order to more clearly illustrate the purpose, technical solutions and advantages of the embodiments of the present invention, the present invention will be further illustrated in conjunction with the accompanying drawings and embodiments for a clear and complete description. Obviously, the described embodiments are partial embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0021] like Figure 1-Figure 6 As shown, an embodiment of the present invention is proposed, which provides a multi-purpose injection device under medical endoscopy to solve the problem that the existing injection device can only be held firmly by medical staff, which may cause it to shake easily during the injection process, affecting the normal injection. The device comprises: a fixing frame 1; a syringe 2, which is arranged on the fixing frame 1, the syringe 2 is filled with a medical medium, a push rod 3 is slidably connected to the syringe 2, and the syringe 2 is fixedly connected and connected to an injection tube 4; a plurality of friction blocks 5 are arranged at intervals and fixedly connected to the fixing frame 1, the friction blocks 5 are used to stabilize the syringe 2, there is an angle between the axis of the friction block 5 and the adjacent normal on the injection tube 4, and the friction blocks 5 are used to stabilize the injection tube 4, and one end of the injection tube 4 away from the syringe 2 is fixedly connected and connected to an injection needle 6; an isolation mechanism is arranged on the side of the injection tube 4 away from the syringe 2, and is used to isolate the injection needle 6.

[0022] In the above scheme, the fixing frame 1 is plugged into the endoscope 101 by a "mortise and tenon" method, and there is friction between the two. The medical medium in the syringe 2 is a liquid (the liquid includes but is not limited to therapeutic drugs). The fixing frame 1 and the syringe 2 can slide relative to each other. The friction block 5 is an elastic rubber block. When using this device, the medical staff first inserts the endoscope 101 into the patient's body, then fixes the fixing frame 1 to the right side of the endoscope 101, and then passes the injection tube 4 through the fixing frame 1 and moves the injection tube 4 along the endoscope 101 into the patient's body. The injection tube 4 drives the injection needle 6 During the process, after the syringe 2 contacts the fixing frame 1, the syringe 2 starts to slide along the fixing frame 1. When the syringe 2 contacts the friction block 5, the friction block 5 is squeezed and deformed. The deformation of the friction block 5 is used to "fix" the syringe 2 (so that there is damping when the syringe 2 and the fixing frame 1 slide relative to each other). In this way, the injection tube 4 is continuously transferred into the patient's body until the injection needle 6 reaches (inserts) a predetermined position (lesion target). At this time, the syringe 2 is in a state of "penetrating" the fixing frame 1. Then the medical staff rotates the syringe 2 clockwise (such as Figure 3 Taking the right view direction as an example), the syringe 2 begins to squeeze the friction block 5 along its normal direction, and the friction block 5 further deforms. The axis of the friction block 5 gradually coincides with the adjacent normal on the syringe 2, thereby performing the final fixation of the syringe 2 before injection, thereby ensuring the stability of the injection needle 6 during the subsequent injection process and improving the injection effect. During the process, the isolation mechanism always covers the injection needle 6 to ensure its cleanliness before injection.

[0023] After the syringe 2 is fixed, the medical staff pushes the push rod 3 to the left, and the push rod 3 and the syringe 2 slide relative to each other, so as to transfer the medical medium in the syringe 2 to the injection tube 4, and finally the medical medium enters the patient's lesion target through the injection needle 6. After the injection of the medical medium is completed, the medical staff rotates the syringe 2 in the opposite direction to gradually reset the friction block 5 and reduce the squeezing force applied to the syringe 2. Then the medical staff pulls the syringe 2 to the right, and the syringe 2 drives the parts on it to move to the right until the syringe 2 and its parts are detached from the endoscope 101. At this time, the injection work is completed, and then the fixing frame 1 can be removed from the endoscope 101.

[0024] like Figure 4-Figure 6 and Fig. 9 As shown, the isolation mechanism includes: an isolation sleeve 701, fixedly connected to the injection tube 4, the isolation sleeve 701 is made of soft material, and the isolation sleeve 701 is provided with a first through hole; a connecting ring 702, fixedly connected to the isolation sleeve 701; a first steel wire 703, one end of which is fixedly connected to the connecting ring 702; a transmission assembly, arranged on the injection tube 4, for deforming the isolation sleeve 701, the isolation sleeve 701 is provided with a convex ring 8, the convex ring 8 is used to support the isolation sleeve 701, and the injection needle 6 guides the convex ring 8.

[0025] In the above scheme, the isolation sleeve 701 relies on its own deformation to block the first through hole thereon, so as to ensure that the isolation sleeve 701 covers the injection needle 6. The right side of the isolation sleeve 701 is rubber, and the left side is latex. The first through hole on the isolation sleeve 701 is located on the left side near the area for the injection needle 6 to allow the injection needle 6 to pass through. In the initial state, the first through hole on the isolation sleeve 701 is in a blocked state. The convex ring 8 is hard plastic, and the convex ring 8 slides on the injection needle 6. In the process of the injection tube 4 moving to the left in the endoscope 101, the isolation sleeve 701 always wraps the injection needle 6, thereby preventing the patient's body fluid from entering the endoscope 101. The injection needle 6 is contaminated, thereby reducing the patient's body fluids that adhere to the injection needle 6 when it is subsequently inserted into the patient's lesion target, thereby ensuring the cleanliness of the injection needle 6 during injection, so that the patient's lesion target is in a relatively clean environment during the injection process, thereby improving the injection effect. After the injection needle 6 moves to the left to the patient's lesion target, the first steel wire 703 drives the connecting ring 702 to move to the right through the transmission assembly, (that is) the isolation sleeve 701 is deformed to the right, and the injection needle 6 gradually passes through the isolation sleeve 701, so that the isolation sleeve 701 gradually loses its cover on the injection needle 6, allowing subsequent injection work to proceed normally.

[0026] like Figure 4-Figure 6 and Fig. 9 As shown, the transmission assembly includes: a transmission shell 901, which is fixedly connected to the injection tube 4, the transmission shell 901 is sealingly and slidably connected to the endoscope 101, and is used to block the endoscope 101, the first steel wire 703 is tightly fitted with the transmission shell 901, and the transmission shell 901 is provided with a boss, which is in a circular ring shape; a sliding ring 902 is slidably connected inside the transmission shell 901, and the boss of the transmission shell 901 is used to limit the sliding ring 902, the sliding ring 902 is fixedly connected to the other end of the first steel wire 703, a first elastic element 903 is fixedly connected between the sliding ring 902 and the transmission shell 901, and a second elastic element 904 is fixedly connected inside the injection tube 4, The second elastic element 904 is initially compressed, and a second through hole is provided on the second elastic element 904. The second through hole on the second elastic element 904 is initially in a blocked state, that is, the second elastic element 904 has elastic force, and the elastic coefficient of the second elastic element 904 is greater than the elastic coefficient of the first elastic element 903, which is used to make the injection needle 6 work again after the isolation sleeve 701 is compressed (that is, the injection needle 6 first loses the "shrouded" state, and then injects), and the injection tube 4 is provided with a first channel 905, the first channel 905 is connected to the transmission housing 901, and the first channel 905 and the sliding ring 902 are respectively located on both sides of the boss on the transmission housing 901.

[0027] In the above scheme, the sealing connection between the transmission housing 901 and the endoscope 101 is used to prevent the patient's body fluid from flowing back. The first elastic element 903 is a spring, and the first elastic element 903 is always in a compressed state, which is used to reset the sliding ring 902. The second elastic element 904 is made of elastic rubber. The second elastic element 904 blocks the second through hole thereon by its own deformation. After the injection needle 6 moves leftward to the patient's lesion target (the medical staff push rod 3 and the syringe 2 slide relative to each other), the medical medium gradually enters the injection tube 4. Since the second through hole on the second elastic element 904 is in a blocked state at this time, the medical medium cannot pass through, that is, the medical medium is squeezed through the first channel 905 into the transmission housing 901, and squeezes the sliding ring 902 to the left. The sliding ring 902 begins to slide leftward in the transmission housing 901, and the first elastic element 903 is further compressed. The sliding ring 902 moves the connecting ring 702 to the right through the first steel wire 703. The connecting ring 702 causes the isolation sleeve 701 to deform to the right (the isolation sleeve 701 as a whole gradually accumulates to the right), and the convex ring 8 slides to the right along the injection needle 6. After the left side of the isolation sleeve 701 contacts the injection needle 6, the injection needle 6 gradually passes through the first through hole on the isolation sleeve 701, so that the injection needle 6 gradually "appears". During the process, the medical staff pushes the syringe 2 to the left again, so that the injection needle 6 gradually penetrates into the patient's lesion target. After the injection needle 6 is completely "exposed", the first elastic element 903 is compressed to the limit state (the injection needle 6 also penetrates into the patient's lesion target completely, and then the syringe 2 is rotated to deform the friction block 5 and fix the syringe 2). As the medical medium continues to enter the injection tube 4, the pressure of the medical medium gradually overcomes the elastic force of the second elastic element 904. After it is completely overcome, the medical medium passes through the second through hole on the second elastic element 904, and then the medical medium enters the patient's lesion target through the injection needle 6 to complete the injection.

[0028] like Figure 4-Figure 9 As shown, it also includes: a walking bag 1001, which is fixedly connected to the injection tube 4, the walking bag 1001 is made of soft material, and the walking bag 1001 is filled with a fluid medium. The fixed connection area between the walking bag 1001 and the injection tube 4 is smaller than the area covered by the walking bag 1001. The outer side of the walking bag 1001 is set as a rough surface to increase the friction between the walking bag 1001 and the endoscope 101. A second steel wire 1002 is fixedly connected between the walking bag 1001 and the sliding ring 902, and the second steel wire 1002 is tightly fitted with the transmission shell 901. The injection tube 4 is provided with a second channel 1003, and the second channel 1003 is connected to the walking bag 1001. A third elastic element 1004 is installed in the second channel 1003. The walking bag 1001 is provided with a groove 11, and the groove 11 is used to accommodate the second steel wire 1002, so as to stabilize the walking bag 1001 circumferentially.

[0029] In the above scheme, the walking bag 1001 is "air bag-shaped", the fluid medium in the walking bag 1001 is physiological saline, the fixed connection point between the walking bag 1001 and the injection tube 4 is located at the right part of the inner side of the walking bag 1001, the right part of the second steel wire 1002 is "inserted" into the walking bag 1001 (the fixed connection area between the right part of the second steel wire 1002 and the walking bag 1001 is located on the outer side of the walking bag 1001), the second steel wire 1002 has shape memory ability, the walking bag 1001 is not in contact with the endoscope 101 in the initial state, the injection tube 4 and the transmission shell 901 are both used to support and guide the second steel wire 1002, and the third elastic element 1004 is an elastic rubber sheet, which is used to deform under pressure to squeeze the walking bag 100 1, the elastic coefficient of the third elastic element 1004 is less than the elastic coefficient of the first elastic element 903, the groove 11 is a horizontal straight groove, and its diameter is the same as the diameter of the second steel wire 1002, which is used to increase the contact area between the second steel wire 1002 and the walking bag 1001 and improve the supporting effect on the walking bag 1001. In the process of the medical medium entering the injection tube 4 (the second through hole on the second elastic element 904 is in a blocked state), the medical medium squeezes the third elastic element 1004, and the third elastic element 1004 is deformed and squeezes the physiological saline in the walking bag 1001, so that the walking bag 1001 expands and gradually contacts with the inner wall of the endoscope 101 (the isolation sleeve 701 is not deformed during the process).

[0030] After the walking bag 1001 is fully inflated and contacts the inner wall of the endoscope 101, as the medical medium continues to enter the injection tube 4, the isolation sleeve 701 begins to deform (gradually loses the cover of the injection needle 6, and the sliding ring 902 is in a state of moving to the left), and the sliding ring 902 drives the walking bag 1001 to "roll" through the second steel wire 1002 (because the second steel wire 1002 is fixedly connected to the right part of the inner side of the walking bag 1001, when the second steel wire 1002 pulls the walking bag 1001 to the left, the walking bag 1001 moves to the left). Rolling), the walking bag 1001 drives the injection tube 4 to move to the left, and the injection tube 4 drives the injection needle 6 to move to the left, so that the medical staff can avoid using the "whole" injection tube 4 to drive the injection needle 6 to move. Because the injection tube 4 is soft and the force transmission path is long, the injection needle 6 will swing during the insertion process, so that the injection needle 6 can stably and accurately penetrate the patient's lesion target, thereby improving the injection effect. Because the driving force is located closer to the injection needle 6, it can also have a more precise insertion state for hardened lesion tissue.

[0031] like Fig. 9 and Fig.10As shown, it also includes: a liquid outlet piece 1201, which is a plurality of circumferentially arranged and fixedly connected to the transmission shell 901. The transmission shell 901 is filled with a fluid medium. The liquid outlet piece 1201 is provided with a third through hole. The transmission shell 901 is provided with a liquid injection piece 1202. The liquid outlet piece 1201 and the liquid injection piece 1202 are both made of soft materials. The longest distance of the projection of the liquid injection piece 1202 on the horizontal plane is less than the width of the sliding ring 902, which is used to seal the liquid injection piece 1202.

[0032] In the above scheme, the fluid medium in the transmission housing 901 includes but is not limited to physiological saline. The liquid outlet 1201 and the liquid injection part 1202 are both made of elastic rubber material, and in the initial state, the liquid outlet 1201 relies on its own deformation to block the third through hole thereon, and the liquid injection part 1202 is used to add fluid medium into the transmission housing 901. When the sliding ring 902 slides to the left along the transmission housing 901, the sliding ring 902 squeezes the physiological saline in the transmission housing 901, and then the physiological saline is discharged (sprayed) from the third through hole on the liquid outlet 1201, so as to clean the patient's lesion target site, thereby removing mucus, secretions or other impurities at the patient's lesion target site, thereby providing medical staff with a clearer observation field, thereby improving the accuracy of the injection position and further improving the injection effect.

[0033] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-purpose injection device for medical endoscopy, characterized in that: Included are: Fixed frame (1); A syringe (2) is arranged on the fixing frame (1), the syringe (2) is filled with a medical medium, a push rod (3) is slidably connected to the syringe (2), and the syringe (2) is fixedly connected and communicated with an injection tube (4); A plurality of friction blocks (5) are arranged at intervals and fixedly connected to the fixing frame (1); the friction blocks (5) are used to stabilize the syringe (2); an end of the injection tube (4) away from the syringe (2) is fixedly connected and communicated with an injection needle (6); An isolation mechanism is arranged on a side of the injection tube (4) away from the syringe (2) and is used to isolate the injection needle (6).

2. A multi-purpose injection device for medical endoscopy according to claim 1, characterized in that: There is an angle between the axis of the friction block (5) and the adjacent normal line on the injection tube (4), which is used to stabilize the injection tube (4).

3. A multi-purpose injection device for medical endoscopy according to claim 1, characterized in that: The isolation mechanism comprises: An isolation sleeve (701) is fixedly connected to the injection tube (4); the isolation sleeve (701) is made of a soft material and is provided with a first through hole; A connecting ring (702) fixedly connected to the isolation sleeve (701); A first steel wire (703), one end of which is fixedly connected to the connecting ring (702); A transmission assembly is arranged on the injection tube (4) and is used to deform the isolation sleeve (701).

4. A multi-purpose injection device for medical endoscopy according to claim 3, characterized in that: The isolation sleeve (701) is provided with a convex ring (8), the convex ring (8) is used to support the isolation sleeve (701), and the injection needle (6) guides the convex ring (8).

5. The multi-purpose injection device for medical endoscopy according to claim 3, characterized in that: The transmission assembly comprises: A transmission housing (901) is fixedly connected to the injection tube (4), the first steel wire (703) is tightly fitted to the transmission housing (901), and the transmission housing (901) is provided with a boss; A sliding ring (902) is slidably connected inside the transmission housing (901), and a boss of the transmission housing (901) is used to limit the sliding ring (902). The sliding ring (902) is fixedly connected to the other end of the first steel wire (703), and a first elastic element (903) is fixedly connected between the sliding ring (902) and the transmission housing (901). A second elastic element (904) is fixedly connected inside the injection tube (4), and a second through hole is provided on the second elastic element (904). The second through hole on the second elastic element (904) is initially in a blocked state, that is, the second elastic element (904) has elastic force, and the second elastic element (904) is initially compressed. The injection tube (4) is provided with a first channel (905), and the first channel (905) is communicated with the transmission housing (901). The first channel (905) and the sliding ring (902) are respectively located on both sides of the boss on the transmission housing (901).

6. A multi-purpose injection device for medical endoscopy according to claim 5, characterized in that: The elastic coefficient of the second elastic element (904) is greater than the elastic coefficient of the first elastic element (903), and is used to enable the injection needle (6) to work again after the isolation sleeve (701) is compressed.

7. A multi-purpose injection device for medical endoscopy according to claim 5, characterized in that: The transmission housing (901) is sealingly and slidably connected to the endoscope (101) and is used to seal the endoscope (101).

8. The multi-purpose injection device for medical endoscopy according to claim 5, characterized in that: Also included are: A walking bag (1001) is fixedly connected to the injection tube (4); the walking bag (1001) is made of a soft material and is filled with a fluid medium; a fixed connection area between the walking bag (1001) and the injection tube (4) is smaller than an area covered by the walking bag (1001) on the injection tube (4); a second steel wire (1002) is fixedly connected between the walking bag (1001) and the sliding ring (902); the second steel wire (1002) is tightly fitted with the transmission housing (901); the injection tube (4) is provided with a second channel (1003); the second channel (1003) is connected to the walking bag (1001); and a third elastic element (1004) is installed in the second channel (1003).

9. A multi-purpose injection device for medical endoscopy according to claim 8, characterized in that: The outer side of the walking bag (1001) is configured as a rough surface, so as to increase the friction between the walking bag (1001) and the injection tube (4).

10. The multi-purpose injection device for medical endoscopy according to claim 8, characterized in that: The walking bag (1001) is provided with a groove (11), and the groove (11) is used to accommodate the second steel wire (1002), so as to stabilize the walking bag (1001) in a circumferential direction.

11. The multi-purpose injection device for medical endoscopy according to claim 5, characterized in that: Also included are: The liquid outlet parts (1201) are a plurality of circumferentially arranged parts, each of which is fixedly connected to the transmission housing (901); the transmission housing (901) is filled with a fluid medium; the liquid outlet part (1201) is provided with a third through hole; the transmission housing (901) is provided with a liquid injection part (1202); and both the liquid outlet part (1201) and the liquid injection part (1202) are made of soft materials.

12. A multi-purpose injection device for medical endoscopy according to claim 11, characterized in that: The longest distance of the projection of the liquid injection piece (1202) on the horizontal plane is smaller than the width of the sliding ring (902), and is used to seal the liquid injection piece (1202).

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