Endoscope injection needle

Abstract

The invention discloses an endoscope injection needle, and belongs to the technical field of medical instruments, the endoscope injection needle comprises a shell, a push rod and an outer sheath tube, one end of the push rod in the shell is provided with a steel tube, the steel tube is sleeved with an inner tube, the end part of the inner tube is provided with an injection needle, and the injection needle is located in the outer sheath tube; a liquid injection channel is formed in the push rod, the steel tube, the inner tube and the injection needle; a key assembly is arranged between the push rod and the shell and comprises a key capable of sliding in the radial direction of the push rod, a first spring capable of enabling the key to automatically slide in the radial direction and a second spring capable of enabling the push rod to automatically reset, and automatic locking or unlocking between the push rod and the shell is achieved through the key assembly. The key is provided with a second limiting rib, and the push rod is provided with a second clamping groove matched with the second limiting rib. Automatic locking during needle feeding is achieved through cooperation of a mechanical structure, automatic needle returning is achieved by pressing a key during needle returning, operation can be achieved with one hand, and operation is more convenient and faster.

Description

Technical Field

[0001] The present invention relates to an endoscopic injection needle, belonging to the technical field of medical devices. Background Art

[0002] With the changes in dietary structure and the increasing aging of the population, the incidence of diseases such as gastrointestinal bleeding, varicose veins, and polyps has risen. For example, the number of patients with esophageal and gastric fundus varices has increased. Traditional treatments have the disadvantages of large trauma and slow recovery, while endoscopic injection of sclerosing agents or tissue adhesives has become the mainstream minimally invasive therapy. Research shows that the success rate of endoscopic injection needle technology in gastrointestinal hemostasis is significantly higher than that of traditional methods (such as comparing the success rate of the control group, the hemostasis success rate of the observation group is higher). Endoscopic technology has become the core means for the diagnosis and treatment of gastrointestinal diseases due to its characteristics of "visual operation, small wound, and fast recovery". As a key tool for endoscopic treatment, injection needles are commonly used clinically for gastrointestinal bleeding caused by esophageal and gastric varices, etc., and for injecting target tissues during the treatment of other gastrointestinal-related diseases.

[0003] However, in existing endoscopic injection needles, the push rod usually slides back and forth inside the outer shell. Elastic protrusions are provided on the push rod to cooperate with the positioning grooves on the outer shell to control the injection depth. In the prior art, due to insufficient elastic modulus of the elastic protrusions on the push rod, the clamping fails, and there is a possibility of the needle tip retracting during use. Moreover, when retracting the needle, one hand needs to hold the outer shell, and the other hand needs to pull the push rod back to its original position to retract the needle. This requires the doctor to free both hands for operation, which is laborious and not convenient enough. In view of the above problems, an endoscopic injection needle of the present patent came into being. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art and provide an endoscopic injection needle that realizes automatic locking during needle insertion through the cooperation of mechanical structures, which is more reliable. When retracting the needle, pressing a button can automatically retract the needle, and it can be operated with one hand, which is more convenient and fast, and improves the surgical efficiency.

[0005] The technical solution adopted by the present invention to solve the problems it faces is: An endoscopic injection needle, comprising an outer shell, a push rod slidably connected to the outer shell, and an outer sheath tube installed at the end of the outer shell. The inside of the push rod is a hollow structure. One end of the push rod located inside the outer shell is installed with a steel tube. An inner tube is sleeved on the steel tube. An injection needle is installed at the end of the inner tube. The injection needle is located inside the outer sheath tube. A liquid injection channel is formed inside the push rod, the steel tube, the inner tube, and the injection needle; A button assembly is provided between the push rod and the outer shell. The button assembly includes a button that can slide radially along the push rod, a first spring that can make the button slide radially spontaneously, and a second spring that can make the push rod reset spontaneously. The button assembly realizes automatic locking or unlocking between the push rod and the outer shell; The button is provided with a second limiting rib, and the push rod is provided with a second clamping groove adapted thereto. After the push rod moves axially along the housing to the position where the second limiting rib is located, the second limiting rib is snapped into the second clamping groove to form an axial limiting constraint, and the push rod can only insert the needle but cannot retract.

[0006] Preferably, the interior of the housing is a stepped hole structure. The interior of the housing is provided with a first end face. The right end of the housing is provided with a snap groove and a button through hole. Inside the right end of the housing, there are a radially arranged slot and a radially arranged guiding rib.

[0007] Preferably, a card seat is installed at the lower part of the right end of the housing. The card seat includes an elastic snap that is snap-connected to the snap groove, two insertion blocks that are slidably connected to the slot, and a counterbore. A U-shaped groove is provided between the two insertion blocks.

[0008] Preferably, a button is installed at the right end of the housing. The button includes a protruding part, an oblong hole, a first spring mounting seat, and a radially arranged sliding groove. The button is sleeved on the push rod through the oblong hole. The sliding groove is slidably connected to the guiding rib of the housing. The protruding part protrudes from the surface of the housing through the button through hole. The second limiting rib is arranged on the oblong hole. The height dimension of the button in the height direction inside the housing is lower than the height dimension of the housing where the button is located. A first spring is sleeved on the first spring mounting seat. One end of the first spring is fixedly connected to the button, and the other end of the first spring abuts against the bottom surface of the counterbore of the card seat.

[0009] Preferably, the push rod is provided with mirror-image sliding planes, limiting surfaces, a second end face, and a handle part. The sliding plane extends all the way to the second clamping groove. The sliding plane is slidably connected to the side surface of the U-shaped groove of the card seat. A second spring is sleeved on the push rod. One end of the second spring is fixedly connected to the second end face, and the other end of the second spring abuts against the first end face of the housing. The handle part is provided with a Luer connector.

[0010] Preferably, an end cap is installed on the housing. One end of the end cap is in interference connection with the housing, and the other end of the end cap is in interference connection with the outer sheath tube.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: This application features a high degree of operational simplicity, allowing medical staff to easily complete the injection and retraction of the liquid medicine with just one hand. It is exquisitely designed and uses endoscope technology to achieve precise needle insertion control, ensuring the accuracy of liquid medicine injection. During the operation, the bounce of the button not only provides intuitive visual feedback but also is accompanied by a clear "click" sound, bringing clear auditory confirmation to medical staff and effectively reducing the possibility of misoperation. The unique locking and automatic return design greatly reduces the operation burden on medical staff, ensures the stability during the injection process, significantly enhances the safety guarantee for patients, and has a compact and efficient overall design. All components work together to achieve the high efficiency, stability, and reliability of the liquid medicine injection process. It is widely applicable to various medical environments and needs. Through rapid and accurate needle insertion and retraction operations, this device helps to shorten the operation time, improve the utilization efficiency of medical resources, and at the same time enhances the usage experience of medical staff, reduces operation fatigue and stress. It is an innovative medical device integrating safety, efficiency, and convenience. Description of the Drawings

[0012] Figure 1 Structural diagram of an endoscope injection needle according to the present invention; Figure 2 Full-section front view of an endoscope injection needle according to the present invention; Figure 3 Partial enlarged view at D of the full-section front view of an endoscope injection needle according to the present invention; Figure 4 Full-section top view of an endoscope injection needle according to the present invention; Figure 5 Partial enlarged view at E of the full-section top view of an endoscope injection needle according to the present invention; Figure 6 Partial enlarged view at F of the full-section top view of an endoscope injection needle according to the present invention; Figure 7 Full-section right view of an endoscope injection needle according to the present invention; Figure 8 Structural diagram of the push rod of an endoscope injection needle according to the present invention; Figure 9 Structural diagram of the button of an endoscope injection needle according to the present invention; Figure 10 Full-section side view of the button of an endoscope injection needle according to the present invention; Figure 11 Full-section front view of the housing of an endoscope injection needle according to the present invention; Figure 12 Top view of the housing of an endoscope injection needle according to the present invention; Figure 13 Right view of the housing of an endoscope injection needle according to the present invention; Figure 14Structural diagram of an endoscope injection needle holder according to the present invention; Figure 15 Another structural diagram of an endoscope injection needle push rod according to the present invention; Figure 16 Another structural diagram of an endoscope injection needle button according to the present invention; Figure 17 Another full-sectional side view of an endoscope injection needle button according to the present invention.

[0013] In the figure: 1. Outer shell, 101. Slot, 102. Button through hole, 103. Guide rib, 104. Snap groove, 105. First end face, 2. Button, 201. Protrusion, 202. Long circular hole, 203. First limiting rib, 204. First spring mounting seat, 205. Slide groove, 206. Second limiting rib, 3. Push rod, 301. First card slot, 302. Sliding plane, 303. Limiting face, 304. Second end face, 305. Handle part, 306. Luer connector, 307. Second card slot, 4. First spring, 5. Holder, 501. Elastic snap, 502. Insert block, 503. U-shaped groove, 504. Counterbore, 6. Second spring, 7. End cap, 8. Outer sheath tube, 9. Steel pipe, 10. Inner tube, 11. Injection needle. Detailed implementation mode

[0014] This specification and the claims do not use the difference in names as a way to distinguish components, but use the difference in functions of components as the criterion for distinction. In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense, and for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0015] As Figures 1-17 shown, an endoscope injection needle includes an outer shell 1, a push rod 3 slidably connected to the outer shell 1, and an outer sheath tube 8 installed at the end of the outer shell 1. The inside of the push rod 3 is a hollow structure. A steel pipe 9 is installed at one end of the push rod 3 located inside the outer shell 1. An inner tube 10 is sleeved on the steel pipe 9. An injection needle 11 is installed at the end of the inner tube 10. The injection needle 11 is located inside the outer sheath tube 8. A liquid injection channel is formed inside the push rod 3, the steel pipe 9, the inner tube 10 and the injection needle 11.

[0016] A key component is arranged between the push rod 3 and the outer shell 1. The key component includes a key 2 that can slide radially along the push rod 3, a first spring 4 that can make the key 2 slide radially spontaneously, and a second spring 6 that can make the push rod 3 reset spontaneously. The key component realizes automatic locking or unlocking between the push rod 3 and the outer shell 1.

[0017] The key 2 is provided with a second limiting rib 206, and the push rod 3 is provided with a second clamping groove 307 adapted thereto. After the push rod 3 moves axially along the outer shell 1 to the position where the second limiting rib 206 is located, the second limiting rib 206 is clamped into the second clamping groove 307 to form an axial limiting constraint, and the push rod 3 can only insert the needle and cannot retract.

[0018] The cross-section of the second limiting rib 206 is triangular, and the cross-section of the second clamping groove 307 is a continuous plurality of triangular grooves. When the push rod 3 is pushed into the interior of the outer shell 1, the second limiting rib 206 is clamped with any triangular clamping groove of the second clamping groove 307, and the injection needle 11 protrudes out of the outer sheath tube 8, realizing the insertion of the injection needle 11. When the push rod 3 pushes the injection needle 11 to insert the needle, the second clamping groove 307 with a cross-section of a continuous plurality of triangular grooves enables the doctor to adjust the insertion depth according to the actual required length of the needle. During the insertion and retraction processes of the injection needle 11, the steel pipe 9, the inner tube 10, and the injection needle 11 as a whole move along with the push rod 3 in the outer shell 1 and the outer sheath tube 8.

[0019] The interior of the outer shell 1 is a stepped hole structure. The interior of the outer shell 1 is provided with a first end face 105. The right end of the outer shell 1 is provided with a snap groove 104 and a key through hole 102. Inside the right end of the outer shell 1, there are a radially arranged slot 101 and a radially arranged guide rib 103.

[0020] A card seat 5 is installed at the lower part of the right end of the outer shell 1. The card seat 5 includes an elastic snap 501 that is clamped with the snap groove 104, two plug blocks 502 that are slidably connected with the slot 101, and a counterbore 504. A U-shaped groove 503 is arranged between the two plug blocks 502.

[0021] A button 2 is installed at the right end of the housing 1. The button 2 includes a protruding portion 201, an oblong hole 202, a first spring mounting seat 204, and a radially arranged chute 205. The button 2 is sleeved on the push rod 3 through the oblong hole 202. The chute 205 is slidably connected to the guiding rib 103 of the housing 1, and the button 2 can freely slide up and down along the guiding rib 103. The protruding portion 201 protrudes from the surface of the housing 1 through the button through hole 102. The second limiting rib 206 is arranged on the oblong hole 202. The height dimension of the button 2 inside the housing 1 is lower than the height dimension of the housing 1 where the button 2 is located, so that there is space for the button 2 to move up and down inside the housing 1. A first spring 4 is sleeved on the first spring mounting seat 204. One end of the first spring 4 is fixedly connected to the button 2, and the other end of the first spring 4 abuts against the bottom surface of the counterbore 504 of the clamping seat 5. When the needle is not inserted, the first spring 4 is in a large compressed state. When in the needle insertion state, although the first spring 4 bounces upward, it is still in a compressed state, and always keeps the second limiting rib 206 of the button 2 in contact with the push rod 3, so that the injection needle 11 is stably in the needle insertion state during use and will not retract.

[0022] The push rod 3 is provided with mirror-image sliding planes 302, limiting surfaces 303, second end surfaces 304, and a handle portion 305. The sliding plane 302 extends all the way to the second card slot 307. The sliding plane 302 is slidably connected to the side surface of the U-shaped groove 503 of the clamping seat 5. When the push rod 3 is pushed to insert the needle, the sliding plane 302 plays a guiding role. At the same time, the U-shaped groove 503 prevents the push rod 3 from rotating circumferentially during the needle insertion process. A second spring 6 is sleeved on the push rod 3. One end of the second spring 6 is fixedly connected to the second end surface 304, and the other end of the second spring 6 abuts against the first end surface 105 of the housing 1. When in the needle insertion state, the second spring 6 is compressed. When retracting the needle, the push rod 3 is reset under the elastic force of the second spring 6. When the injection needle 11 retracts the needle, the limiting surface 303 can abut against the clamping seat 5 to limit the push rod 3, thereby preventing the push rod 3 from coming out of the housing 1. The handle portion 305 is provided with a Luer connector 306, which can be tightly connected to the syringe.

[0023] An end cap 7 is installed on the housing 1. One end of the end cap 7 is in interference fit with the housing 1, and the other end of the end cap 7 is in interference fit with the outer sheath tube 8 to prevent the outer sheath tube 8 from falling off.

[0024] The working principle of an endoscopic injection needle is as follows: Injection preparation: The medical staff firmly holds the housing 1 with one hand and firmly holds the handle portion 305 of the push rod 3 with the other hand, and slowly pushes the push rod 3 forward until the push rod 3 is pushed to a suitable position inside the housing 1.

[0025] Locking and needle insertion: At this time, the second card slot 307 on the push rod 3 is accurately aligned directly above the second limiting rib 206 of the button 2. Under the action of the first spring 4, the button 2 quickly bounces upward, and the protruding part 201 protrudes from the button through hole 102 on the outer shell 1. Medical staff can observe an obvious bouncing phenomenon and a clear "click" sound. Through the endoscope, the doctor confirms that the needle tip of the injection needle 11 has successfully protruded from the outer sheath tube 8. At this moment, the second limiting rib 206 of the button 2 and the second card slot 307 of the push rod 3 are closely matched to achieve the locked state. In this state, the injection needle 11 smoothly inserts the needle. During the needle insertion process, the second spring 6 is in a compressed state. According to needs, medical staff can adjust the needle insertion depth through the second card slot 307.

[0026] Injection and needle retraction: After the liquid medicine injection is completed, medical staff can achieve needle retraction with a single hand operation. Gently press the protruding part 201 to make the second limiting rib 206 of the button 2 disengage from the second card slot 307 of the push rod 3. Immediately, under the strong elastic force of the second spring 6, the push rod 3 automatically and quickly resets to the initial position. At the same time, the protruding injection needle 11 also smoothly retracts into the outer sheath tube 8, completing the entire injection process.

[0027] When the needle insertion depth does not need to be adjusted, the push rod 3 can also provide another implementation method, such as Figures 15-17 shown. Replace the second card slot 307 of the push rod 3 with the first card slot 301. The first card slot 301 is a single rectangular slot. Replace the second limiting rib 206 of the button 2 with the first limiting rib 203. The first limiting rib 203 has a rectangular cross-section. During needle insertion, the first limiting rib 203 is clamped with the first card slot 301. The rest of the structure and operation method are the same as described above.

[0028] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the gist of the present invention.

Claims

1. An endoscopic injection needle, comprising a housing (1), a push rod (3) slidably connected to the housing (1), and an outer sheath tube (8) installed at the end of the housing (1), characterized in that: The push rod (3) has a hollow structure inside. At one end of the push rod (3) located inside the outer shell (1), a steel pipe (9) is installed. An inner pipe (10) is sleeved on the steel pipe (9). An injection needle (11) is installed at the end of the inner pipe (10). The injection needle (11) is located inside the outer sheath tube (8). A liquid injection channel is formed inside the push rod (3), the steel pipe (9), the inner pipe (10), and the injection needle (11). A key component is arranged between the push rod (3) and the outer shell (1). The key component includes a key (2) that can slide radially along the push rod (3), a first spring (4) that can make the key (2) slide radially spontaneously, and a second spring (6) that can make the push rod (3) reset spontaneously. The key component realizes automatic locking or unlocking between the push rod (3) and the outer shell (1). The key (2) is provided with a second limiting rib (206), and the push rod (3) is provided with a second clamping groove (307) adapted thereto. After the push rod (3) moves axially along the outer shell (1) to the position where the second limiting rib (206) is located, the second limiting rib (206) is clamped into the second clamping groove (307) to form an axial limiting constraint, and the push rod (3) can only inject the needle but cannot retract.

2. The endoscopic injection needle according to claim 1, wherein: The inside of the outer shell (1) has a stepped hole structure. The inside of the outer shell (1) is provided with a first end face (105). The right end of the outer shell (1) is provided with a snap groove (104) and a key through hole (102). Inside the right end of the outer shell (1), a radially arranged slot (101) and a radially arranged guiding rib (103) are provided.

3. The endoscopic injection needle according to claim 2, wherein: A clamping seat (5) is installed at the lower part of the right end of the outer shell (1). The clamping seat (5) includes an elastic snap (501) clamped with the snap groove (104), two insertion blocks (502) slidably connected with the slot (101), and a counterbore (504). A U-shaped groove (503) is arranged between the two insertion blocks (502).

4. The endoscopic injection needle according to claim 3, wherein: A key (2) is installed at the right end of the outer shell (1). The key (2) includes a protruding part (201), an oblong hole (202), a first spring mounting seat (204), and a radially arranged sliding groove (205). The key (2) is sleeved on the push rod (3) through the oblong hole (202). The sliding groove (205) is slidably connected with the guiding rib (103) of the outer shell (1). The protruding part (201) protrudes from the surface of the outer shell (1) through the key through hole (102). The second limiting rib (206) is arranged on the oblong hole (202). The height direction dimension of the key (2) inside the outer shell (1) is lower than the height direction dimension of the outer shell (1) where the key (2) is located. A first spring (4) is sleeved on the first spring mounting seat (204). One end of the first spring (4) is fixedly connected with the key (2), and the other end of the first spring (4) abuts against the bottom surface of the counterbore (504) of the clamping seat (5).

5. The endoscopic injection needle according to claim 4, wherein: The push rod (3) is provided with a mirror-image sliding plane (302), a limiting surface (303), a second end surface (304) and a handle portion (305). The sliding plane (302) extends all the way to the second card slot (307). The sliding plane (302) is slidably connected to the side surface of the U-shaped groove (503) of the card holder (5). The second spring (6) is sleeved on the push rod (3). One end of the second spring (6) is fixedly connected to the second end surface (304), and the other end of the second spring (6) abuts against the first end surface (105) of the housing (1). The handle portion (305) is provided with a luer connector (306).

6. The endoscopic injection needle according to claim 1, wherein: An end cap (7) is installed on the housing (1). One end of the end cap (7) is in interference connection with the housing (1), and the other end of the end cap (7) is in interference connection with the outer sheath tube (8).

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