Injection needle under cystoscope

Abstract

The invention relates to the technical field of medical instruments, and discloses a cystoscope injection needle which comprises a rotating sleeve, an annular groove is formed in the position, close to one end, of the outer surface of the rotating sleeve, and a connecting frame and a connecting plate are slidably mounted in the positions, close to the two sides, of the interior of the annular groove correspondingly; pointers are fixedly installed on the two sides of the connecting frame, the pointers correspond to graduated scales, located on the two sides of the third sliding hole, on the outer surface of the stroke sleeve, and a traction cable is fixedly installed on the front face of the connecting frame. A connecting frame is taken down from the interior of an annular groove and inserted into an inserting groove, at the moment, a push handle is pushed, meanwhile, a threaded rod, an injection push rod and a rotating sleeve are driven to synchronously move, and in the injection push rod moving process, only a telescopic needle can be pushed to stretch out of the interior of a front sleeve, so that rapid stretching of the telescopic needle is achieved; and on the premise that the stretching amount of the telescopic needle head can be accurately controlled, the telescopic needle head can be controlled to stretch out rapidly, and the application range of the device is widened.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to an injection needle for cystoscopy. Background Technology

[0002] A cystoscopic injection needle is a disposable, minimally invasive instrument used in cystoscopic surgery in urology to precisely inject medication into the bladder wall, urethra, bladder neck, and prostate. Its core structure consists of a retractable needle and a sheath. During use, the needle extends from the head of the sheath and pierces the bladder wall, delivering medication through the tubing within the sheath and the retractable needle into the bladder wall. The same procedure can be performed on the prostate. However, in practice, due to the relatively long needle and the thin bladder wall, there is a risk of the needle directly piercing the bladder, leading to perforation. Furthermore, controlling the injection volume during medication delivery can result in overdose and damage to bladder tissue. This application proposes a cystoscopic injection needle to address these issues. Summary of the Invention

[0003] This application proposes an injection needle for cystoscopy, which has the advantages of being able to precisely control the amount of needle extension or extend the needle completely at once, thereby solving the problem that traditional injection needles cannot control the amount of extension.

[0004] To achieve the above objectives, this application adopts the following technical solution: an injection needle for cystoscopy, comprising a sheath and a shell, wherein a travel sleeve is fixedly installed at the front end of the shell, a first sliding hole is provided at the top of the outer surface of the travel sleeve, a second sliding hole is provided on both sides of the outer surface of the travel sleeve, and a third sliding hole is provided at the bottom of the outer surface of the travel sleeve, a toothed rack is provided on the inner wall of the travel sleeve at the position in front of the third sliding hole, a locking buckle is fixedly installed on the outer surface of the travel sleeve at the position in front of the first sliding hole, a push handle is movably installed inside the shell, pushing the push handle to move inward into the shell can drive the threaded rod and the injection push rod to move synchronously, a threaded rod is fixedly installed at the front end of the push handle, an injection push rod is fixedly installed at the front end of the threaded rod, the front end of the travel sleeve is fixedly connected to the sheath, and a scale is provided on both sides of the third sliding hole on the outer surface of the travel sleeve.

[0005] Furthermore, the outer surface of the threaded rod is provided with threads, and a rotating sleeve is fitted through the threads. An annular groove is formed on the outer surface of the rotating sleeve near one end. A connecting frame and a connecting plate are slidably installed on the inner side of the annular groove near both sides. A pointer is fixedly installed on both sides of the connecting frame. The pointer corresponds to the scale on both sides of the third sliding hole on the outer surface of the travel sleeve. A traction cable is fixedly installed on the front of the connecting frame. A toothed plate is fixedly installed on the front of the connecting plate. The toothed plate is engaged with the locking buckle and only allows the toothed plate to move in one direction.

[0006] Furthermore, a stroke groove is formed on one side of the outer surface of the rotating sleeve, and an annular cavity is formed at the end of the rotating sleeve away from the annular groove. The annular cavity is connected to the stroke groove, and a squeezing device is movably installed inside the stroke groove and the annular cavity. An injection channel is provided on the other side of the outer surface of the rotating sleeve, and the injection channel extends into the interior of the annular cavity. A first single nozzle is provided at the connection between the interior of the injection channel and the annular cavity. The first single nozzle only allows liquid to pass through the first single nozzle from the interior of the injection channel.

[0007] Furthermore, the extrusion device includes an annular extrusion plate, the front of which has an installation hole, and a third single-pass nozzle is provided inside the installation hole. The third single-pass nozzle only allows liquid to pass through from the side away from the push rod. A push rod is fixedly installed on the front of the annular extrusion plate near one side, and an insertion hole is provided on one side of the push rod. Specifically, the annular extrusion plate is located near the bottom of the annular cavity, the push rod is located inside the stroke groove, and a detachable insert rod is inserted into the insertion hole.

[0008] Furthermore, a liquid guiding cylinder is movably installed inside the annular cavity. A buckle is fixedly installed at one end of the liquid guiding cylinder near the lower position. A liquid guiding channel is opened at one end of the liquid guiding cylinder near the left side position. The liquid guiding channel passes through the liquid guiding cylinder and a second single-pass nozzle is provided inside the liquid guiding channel. The second single-pass nozzle only allows liquid to pass through from one side and enter the interior of the liquid guiding channel. A liquid guiding tube is fixedly installed at one end of the liquid guiding cylinder at a position corresponding to the liquid guiding channel. Specifically, the liquid guide tube is initially in contact with the extrusion device, the liquid guide tube is connected to the injection push rod, and the buckle and the toothed rack are in a corresponding state.

[0009] Furthermore, one end of the sheath is provided with an upper circular hole and a lower circular hole, the injection push rod extends inside the upper circular hole, and the traction cable extends inside the lower circular hole.

[0010] Furthermore, a front sleeve is provided at the end of the sheath away from the outer shell. The front sleeve is connected to the upper circular hole. A telescopic needle is provided inside the front sleeve. An outer skin is provided on the outer surface of the telescopic needle. The traction cable passes through the front sleeve and extends into the interior. The traction cable is connected to the outer skin. When the traction cable is pulled, it will drag the outer skin backward and cause the telescopic needle to extend out from the interior of the outer skin.

[0011] Furthermore, the syringe carrying the drug can inject the drug into the interior of the annular cavity through the injection channel and the third single-pass nozzle.

[0012] Furthermore, a slot is provided on the outer surface of the travel sleeve above the third sliding hole, and the slot is adapted to one end of the connecting bracket.

[0013] This application has the following beneficial effects.

[0014] 1. This device extends the telescopic needle and outer skin from the inside of the front cannula by pushing the push handle. By rotating the sleeve and pulling the traction cable, the outer skin is dragged and retracted. At this time, the telescopic needle extends and pierces the patient's bladder wall, achieving a precise puncture effect.

[0015] 2. This device can be used to insert the connecting bracket into the slot, and then push the handle again. The traction cable remains in its current state, so that the telescopic needle extends out of the front sleeve and the outer skin remains stationary and does not extend synchronously with the telescopic needle.

[0016] 3. This device can automatically adjust the injection volume of the drug according to the extension of the telescopic needle, avoiding the problem of excessive drug injection and damage to the human body caused by the thin bladder wall. Attached Figure Description

[0017] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.

[0018] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the telescopic structure of the present invention; Figure 3 This is a top view of the telescopic structure of the present invention; Figure 4 This is a cross-sectional view of the telescopic structure of the present invention; Figure 5 The structure of this invention Figure 4 Enlarged view of point A in the middle; Figure 6 This is a schematic diagram of the structural stroke sleeve of the present invention; Figure 7 This is a bottom view of the stroke sleeve structure of the present invention; Figure 8 This is a schematic diagram of the threaded rod structure of the present invention; Figure 9 This is a schematic diagram of the adjustment structure of the present invention; Figure 10 This is a cross-sectional view of the adjustment structure of the present invention; Figure 11 This is a schematic diagram of the extrusion structure of the present invention; Figure 12 This is a schematic diagram of the liquid-conducting structure of the present invention; Figure 13 This is a cross-sectional view of the liquid-conducting structure of the present invention; Figure 14 This is a schematic diagram of the insertion rod structure of the present invention; Figure 15 This is a top view of the insertion rod structure of the present invention; Figure 16 This is a cross-sectional view of the insertion rod structure of the present invention; Figure 17 For the present invention Figure 16 Enlarged diagram of point B in the middle.

[0019] In the diagram: 1. Sheath; 2. Upper circular hole; 3. Lower circular hole; 4. Front sleeve; 5. Telescopic needle; 6. Outer skin; 10. Outer shell; 11. Stroke sleeve; 12. First sliding hole; 13. Second sliding hole; 14. Third sliding hole; 15. Gear rack; 16. Locking buckle; 17. Push handle; 18. Threaded rod; 19. Injection push rod; 20. Rotating sleeve; 21. Annular groove; 22. Connecting frame; 23. Connecting plate; 24. 25. Pointer; 26. Traction cable; 27. Toothed plate; 28. Stroke groove; 29. ​​Annular cavity; 20. Extrusion device; 21. Annular extrusion plate; 292. Mounting hole; 293. Third single nozzle; 294. Push rod; 295. Insertion hole; 30. Injection channel; 31. First single nozzle; 32. Liquid guide tube; 33. Buckle; 34. Liquid guide channel; 35. Second single nozzle; 36. Liquid guide tube; 37. Slot. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0021] A cystoscopic injection needle, please refer to [link / reference]. Figures 1-7The device includes a sheath 1 and a housing 10. A travel sleeve 11 is fixedly installed at the front end of the housing 10. A first sliding hole 12 is provided on the top of the outer surface of the travel sleeve 11. A second sliding hole 13 is provided on both sides of the outer surface of the travel sleeve 11. A third sliding hole 14 is provided on the bottom of the outer surface of the travel sleeve 11. A toothed rack 15 is provided on the inner wall of the travel sleeve 11 in front of the third sliding hole 14. A locking buckle 16 is fixedly installed on the outer surface of the travel sleeve 11 in front of the first sliding hole 12. A push handle 17 is movably installed inside the housing 10. Pushing the push handle 17 into the housing 10 can drive the threaded rod 18 and the injection push rod 19 to move synchronously. A threaded rod 18 is fixedly installed at the front end of the push handle 17. An injection push rod 19 is fixedly installed at the front end of the threaded rod 18. The front end of the travel sleeve 11 is fixedly connected to the sheath 1. A scale is provided on both sides of the third sliding hole 14 on the outer surface of the travel sleeve 11.

[0022] Please see Figures 8-10 The outer surface of the threaded rod 18 is threaded, and a rotating sleeve 20 is fitted through the thread. An annular groove 21 is opened on the outer surface of the rotating sleeve 20 near one end. A connecting frame 22 and a connecting plate 23 are slidably installed on the inner side of the annular groove 21 near both sides. A pointer 24 is fixedly installed on both sides of the connecting frame 22. The pointer 24 corresponds to the scale on both sides of the third sliding hole 14 on the outer surface of the travel sleeve 11. A traction cable 25 is fixedly installed on the front of the connecting frame 22. A toothed plate 26 is fixedly installed on the front of the connecting plate 23. The toothed plate 26 is engaged with the locking buckle 16 and only allows the toothed plate 26 to move in one direction.

[0023] If the patient has a thin bladder wall and requires precise control of the puncture depth, the device is inserted into the patient's bladder via a cystoscope. The front end of the anterior cannula 4 contacts the inner wall of the bladder. At this time, the push handle 17 is manually pushed into the outer shell 10. Since the threaded rod 18 is engaged with the rotating sleeve 20 through the threads on its outer surface, the push handle 17 moves synchronously, causing the threaded rod 18, the injection push rod 19, and the rotating sleeve 20 to move synchronously. Simultaneously, the injection push rod 19 pushes the telescopic needle 5 and the outer skin 6 to extend from the inside of the anterior cannula 4. During the movement of the rotating sleeve 20, the connecting frame 22 moves synchronously, causing the pointer 24 to correspond to the scale on both sides of the third sliding hole 14. As the reading changes, medical staff can determine the extension amount of the telescopic needle 5 and the outer skin 6. Once the extension amount of the telescopic needle 5 and the outer skin 6 reaches the preset value, the sleeve 20 is rotated to engage with the threaded surface of the injection plunger 19. The sleeve 20 is rotated and moved closer to the push handle 17. During the movement of the push handle 17, the connecting frame 22 moves synchronously, thereby dragging the traction cable 25 and causing the outer skin 6 to retract into the inner cannula 4. At this time, the telescopic needle 5 extends out from the inside of the outer skin 6, and the extended part is inserted into the inner wall of the bladder. This allows for precise control of the insertion amount of the telescopic needle 5, avoiding the problem of bladder perforation due to excessive puncture of the telescopic needle 5, and improving the practicality of the device.

[0024] Please see Figures 9-10 A stroke groove 27 is provided on one side of the outer surface of the rotating sleeve 20. An annular cavity 28 is provided at the end of the rotating sleeve 20 away from the annular groove 21. The annular cavity 28 is connected to the stroke groove 27. A squeezing device 29 is movably installed inside the stroke groove 27 and the annular cavity 28. A drug injection channel 30 is provided on the other side of the outer surface of the rotating sleeve 20. The drug injection channel 30 extends into the interior of the annular cavity 28. A first single nozzle 31 is provided at the connection between the inside of the drug injection channel 30 and the annular cavity 28. The first single nozzle 31 only allows liquid to pass through the inside of the drug injection channel 30.

[0025] Please see Figure 11 The extrusion device 29 includes an annular extrusion plate 291. An installation hole 292 is provided on the front side of the annular extrusion plate 291. A third single-pass nozzle 293 is provided inside the installation hole 292. The third single-pass nozzle 293 only allows liquid to pass through from the side away from the push rod 294. The push rod 294 is fixedly installed on the front side of the annular extrusion plate 291 near one side. An insertion hole 295 is provided on one side of the push rod 294. Please see Figures 9-11 The annular extrusion plate 291 is located near the bottom of the annular cavity 28, the push rod 294 is located inside the stroke groove 27, and a detachable insert rod is inserted into the insertion hole 295.

[0026] As the rotating sleeve 20 is rotated and moved towards the side closer to the outer casing 10, the latch 33 engages with the toothed rack 15, causing the liquid guide cylinder 32 to be pulled out from the annular cavity 28, forming a cavity inside the annular cavity 28. At this time, the insert rod is inserted into the insertion hole 295, and the push rod 294 is pushed downwards, causing the annular extrusion plate 291 to move towards the side closer to the liquid guide cylinder 32 within the cavity. A syringe containing the drug is inserted into one end of the injection channel 30, injecting the drug into the cavity formed between the liquid guide cylinder 32 and the annular cavity 28. At this time, pulling the insert rod moves the annular extrusion plate 291 towards the annular groove 21. The medication flows from one side of the annular compression plate 291 to the other side through the third single-nozzle 293. The push rod 294 is then moved again by the insertion rod, causing the annular compression plate 291 to move closer to the liquid guide tube 32. This allows the medication to be squeezed through the second single-nozzle 35 into the liquid guide tube 36. Since the liquid guide tube 36 is connected to the injection push rod 19, the medication enters the injection push rod 19 and is injected into the bladder wall through the front cannula 4, thus achieving drug administration. Furthermore, the dosage can be automatically controlled based on the insertion depth of the telescopic needle 5, avoiding the problem of excessive drug effect due to a thin bladder wall and excessive dosage, thereby improving the practicality of the device.

[0027] Please see Figures 12-13 A liquid guide tube 32 is movably installed inside the annular cavity 28. A buckle 33 is fixedly installed at one end of the liquid guide tube 32 near the lower position. A liquid guide channel 34 is opened at one end of the liquid guide tube 32 near the left side position. The liquid guide channel 34 passes through the liquid guide tube 32 and a second single nozzle 35 is provided inside the liquid guide channel 34. The second single nozzle 35 only allows liquid to pass through from one side and enter the interior of the liquid guide channel 34. A liquid guide tube 36 is fixedly installed at one end of the liquid guide tube 32 at the position corresponding to the liquid guide channel 34. Please see Figure 6 , Figure 8 , Figure 10 and Figures 12-13 In its initial state, the liquid guide tube 32 is in contact with the extrusion device 29, the liquid guide tube 36 is connected to the injection push rod 19, and the buckle 33 and the toothed rack 15 are in a corresponding state.

[0028] During the movement of the push handle 17, the latch 33 slides along the surface of the toothed rack 15 and engages with and locks with the slot at the top of the toothed rack 15. This prevents the push handle 17 from being accidentally touched after it stops being pushed, which could cause the push handle 17 to reset and change the extension amount of the telescopic needle 5, thus affecting the insertion amount. This improves the reliability of the device.

[0029] Please see Figures 8-9 and Figure 14The sheath 1 has an upper circular hole 2 and a lower circular hole 3 at one end. The injection push rod 19 extends inside the upper circular hole 2, and the traction cable 25 extends inside the lower circular hole 3.

[0030] Please see Figure 1 , Figure 9 and Figures 14-17 The end of the sheath 1 away from the outer shell 10 is provided with a front sleeve 4, which is connected to the upper round hole 2. The front sleeve 4 is provided with a telescopic needle 5 inside, and the outer surface of the telescopic needle 5 is provided with an outer skin 6. The traction cable 25 passes through the front sleeve 4 and extends into the interior. The traction cable 25 is connected to the outer skin 6. When the traction cable 25 is pulled, it will drag the outer skin 6 backward and cause the telescopic needle 5 to extend out from the interior of the outer skin 6.

[0031] Please see Figures 10-11 The syringe containing the drug can inject the drug into the annular cavity 28 through the injection channel 30 and the third single nozzle 293.

[0032] Please see Figures 3-6 A slot 37 is provided on the outer surface of the travel sleeve 11 above the third sliding hole 14, and the slot 37 is adapted to one end of the connecting bracket 22.

[0033] When routine operations are required and the puncture volume does not need to be controlled, the connecting bracket 22 can be removed from the inside of the annular groove 21 and inserted into the inside of the slot 37. At this time, push the push handle 17, which simultaneously drives the threaded rod 18, the injection push rod 19 and the rotating sleeve 20 to move synchronously. Since the toothed plate 26 is locked at this time and the outer skin 6 is also unable to move, the injection push rod 19 can only push the telescopic needle 5 to extend from the inside of the front sleeve 4 during the movement, so that the telescopic needle 5 can be quickly extended. This allows for precise control of the extension amount of the telescopic needle 5, as well as control of the rapid extension of the telescopic needle 5, thus expanding the applicability of the device.

[0034] The method of using this invention is as follows: During use, if the patient has a thin bladder wall and requires precise control of the puncture depth, the device is inserted into the patient's bladder via a cystoscope. The front end of the cannula 4 contacts the inner wall of the bladder. At this time, the push handle 17 is manually pushed into the outer shell 10. Since the threaded rod 18 is engaged with the rotating sleeve 20 through the threads on its outer surface, the push handle 17 moves synchronously, causing the threaded rod 18, the injection push rod 19, and the rotating sleeve 20 to move synchronously. Simultaneously, the injection push rod 19 pushes the telescopic needle 5 and the outer skin 6 to extend from the inside of the front cannula 4. During the movement of the rotating sleeve 20, the connecting frame 22 moves synchronously, causing the pointer 24 to move on the scales on both sides of the third sliding hole 14. As the corresponding readings change, medical staff can determine the extension amount of the telescopic needle 5 and the outer skin 6. Once the extension amount of the telescopic needle 5 and the outer skin 6 reaches the preset value, the sleeve 20 is rotated to engage with the threaded surface of the injection plunger 19. Rotating the sleeve 20 moves it closer to the push handle 17. During the movement of the push handle 17, the connecting frame 22 moves synchronously, thereby dragging the traction cable 25 and causing the outer skin 6 to retract into the inner cannula 4. At this time, the telescopic needle 5 extends from inside the outer skin 6, and the extended part inserts into the inner wall of the bladder, thus precisely controlling the insertion amount of the telescopic needle 5. When routine operations are required and the puncture amount does not need to be controlled, the connecting frame 22 can be removed from the ring-shaped... The inside of slot 21 is removed and inserted into slot 37. At this time, push handle 17, which simultaneously drives threaded rod 18, injection push rod 19 and rotating sleeve 20 to move synchronously. Since the toothed plate 26 is locked at this time, the outer skin 6 is also unable to move, so that during the movement of injection push rod 19, it can only push telescopic needle 5 to extend from the inside of front sleeve 4, realizing the rapid extension of telescopic needle 5. During the movement of push handle 17, buckle 33 will slide along the surface of toothed rack 15 and engage with and lock with the top of toothed rack 15. When rotating sleeve 20 is rotated and moved towards the side closer to outer shell 10, since buckle 33 is engaged with toothed rack 15, liquid guide tube 32 is drawn from the inside of annular cavity 28. The annular cavity 28 forms a cavity. The insert rod is then inserted into the insertion hole 295, and the push rod 294 is pushed downwards, causing the annular squeezing plate 291 to move closer to the liquid guide cylinder 32 within the cavity. A syringe containing the medication is inserted into one end of the injection channel 30, injecting the medication into the cavity formed between the liquid guide cylinder 32 and the annular cavity 28. Pulling the insert rod again moves the annular squeezing plate 291 closer to the annular groove 21, allowing the medication to flow from one side of the annular squeezing plate 291 to the other through the third single-nozzle 293. Pushing the push rod 294 again with the insert rod moves the annular squeezing plate 291 closer to the liquid guide cylinder 32, squeezing the medication through the second single-nozzle 35 into the liquid guide tube 36.Because the infusion tube 36 is connected to the injection plunger 19, the medication enters the injection plunger 19 and is injected into the bladder wall through the front cannula 4, thereby achieving drug administration. Furthermore, the dosage can be automatically controlled based on the insertion depth of the telescopic needle 5.

Claims

1. A cystoscopic injection needle, characterized in that, Includes a sheath (1) and a shell (10). A travel sleeve (11) is fixedly installed at the front end of the shell (10). A first sliding hole (12) is provided on the top of the outer surface of the travel sleeve (11). Second sliding holes (13) are provided on both sides of the outer surface of the travel sleeve (11). A third sliding hole (14) is provided on the bottom of the outer surface of the travel sleeve (11). A toothed rack (15) is provided on the inner wall of the travel sleeve (11) in front of the third sliding hole (14). A locking buckle (16) is fixedly installed on the outer surface of the cylinder (11) at the position in front of the first sliding hole (12). A push handle (17) is movably installed inside the outer shell (10). A threaded rod (18) is fixedly installed at the front end of the push handle (17). An injection push rod (19) is fixedly installed at the front end of the threaded rod (18). The front end of the stroke sleeve (11) is fixedly connected to the sheath (1). A scale is provided on both sides of the third sliding hole (14) on the outer surface of the stroke sleeve (11).

2. The cystoscopic injection needle according to claim 1, characterized in that, The outer surface of the threaded rod (18) is provided with threads, and a rotating sleeve (20) is fitted through the threads. An annular groove (21) is provided on the outer surface of the rotating sleeve (20) near one end. A connecting frame (22) and a connecting plate (23) are slidably installed on the inner side of the annular groove (21) near both sides. A pointer (24) is fixedly installed on both sides of the connecting frame (22). The pointer (24) corresponds to the scale on both sides of the third sliding hole (14) on the outer surface of the travel sleeve (11). A traction cable (25) is fixedly installed on the front of the connecting frame (22). A toothed plate (26) is fixedly installed on the front of the connecting plate (23). The toothed plate (26) is engaged with the locking buckle (16) and only allows the toothed plate (26) to move in one direction.

3. The cystoscopic injection needle according to claim 2, characterized in that, A stroke groove (27) is provided on one side of the outer surface of the rotating sleeve (20). An annular cavity (28) is provided at one end of the rotating sleeve (20) away from the annular groove (21). The annular cavity (28) is connected to the stroke groove (27). An extrusion device (29) is movably installed inside the stroke groove (27) and the annular cavity (28). An injection channel (30) is provided on the other side of the outer surface of the rotating sleeve (20). The injection channel (30) extends into the interior of the annular cavity (28). A first single nozzle (31) is provided at the connection between the injection channel (30) and the annular cavity (28).

4. The cystoscopic injection needle according to claim 3, characterized in that, The extrusion device (29) includes an annular extrusion plate (291), the front of the annular extrusion plate (291) is provided with an installation hole (292), the interior of the installation hole (292) is provided with a third single-pass nozzle (293), a push rod (294) is fixedly installed on the front of the annular extrusion plate (291) near one side, and an insertion hole (295) is provided on one side of the push rod (294). The annular extrusion plate (291) is located near the bottom of the annular cavity (28), the push rod (294) is located inside the stroke groove (27), and a detachable insert is inserted into the insertion hole (295).

5. The cystoscopic injection needle according to claim 4, characterized in that, A liquid guide tube (32) is movably installed inside the annular cavity (28). A buckle (33) is fixedly installed at one end of the liquid guide tube (32) near the lower position. A liquid guide channel (34) is opened at one end of the liquid guide tube (32) near the left side position. The liquid guide channel (34) passes through the liquid guide tube (32) and a second single nozzle (35) is provided inside the liquid guide channel (34). A liquid guide tube (36) is fixedly installed at one end of the liquid guide tube (32) at the position corresponding to the liquid guide channel (34). The liquid guide tube (32) is in contact with the squeezing device (29) in the initial state, the liquid guide tube (36) is connected to the injection push rod (19), and the buckle (33) and the toothed rack (15) are in the corresponding state.

6. The cystoscopic injection needle according to claim 5, characterized in that, The sheath (1) has an upper round hole (2) and a lower round hole (3) at one end. The injection push rod (19) extends inside the upper round hole (2), and the traction cable (25) extends inside the lower round hole (3).

7. The cystoscopic injection needle according to claim 2, characterized in that, The sheath (1) is provided with a front sleeve (4) at the end away from the outer shell (10). The front sleeve (4) is connected to the upper round hole (2). The front sleeve (4) is provided with a telescopic needle (5) inside. The outer surface of the telescopic needle (5) is provided with an outer skin (6). The traction cable (25) passes through the front sleeve (4) and extends into the interior. The traction cable (25) is connected to the outer skin (6).

8. The cystoscopic injection needle according to claim 4, characterized in that, The syringe carrying the drug can inject the drug into the interior of the annular cavity (28) through the injection channel (30) and the third single nozzle (293).

9. The cystoscopic injection needle according to claim 2, characterized in that, The outer surface of the travel sleeve (11) is provided with a slot (37) located above the third sliding hole (14), and the slot (37) is adapted to one end of the connecting bracket (22).

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