An endoscopic injection needle

Abstract

This invention discloses an endoscopic injection needle, belonging to the field of medical device technology. The endoscopic injection needle includes a shell, a push rod, and an outer sheath. A steel tube is installed at one end of the push rod inside the shell, and an inner tube is fitted onto the steel tube. An injection needle is installed at the end of the inner tube and is located inside the outer sheath. The push rod, steel tube, inner tube, and the interior of the injection needle form an injection channel. A button assembly is provided between the push rod and the shell. The button assembly includes a button that can slide radially along the push rod, a first spring that allows the button to slide radially on its own, and a second spring that allows the push rod to reset on its own. The button assembly enables automatic locking or unlocking between the push rod and the shell. The button has a second limiting rib, and the push rod has a second corresponding groove. Through the mechanical structure, automatic locking is achieved during needle insertion, and automatic needle retraction is achieved when the button is pressed during needle retraction. This allows for one-handed operation, making it more convenient and faster.

Description

Technical Field

[0001] This invention relates to an endoscopic injection needle, belonging to the field of medical device technology. Background Technology

[0002] With changes in dietary structure and an aging population, the incidence of diseases such as gastrointestinal bleeding, varices, and polyps is rising. For example, there is an increase in patients with esophageal and gastric varices. Traditional treatments have drawbacks such as significant trauma and slow recovery, while endoscopic injection of sclerosing agents or tissue glue has become the mainstream minimally invasive therapy. Studies have shown that endoscopic injection needle technology has a significantly higher success rate in gastrointestinal hemostasis than traditional methods (e.g., comparing the success rates of the control group and the observation group, the hemostasis success rate was higher). Endoscopic technology, due to its characteristics of "visual operation, small incision, and rapid recovery," has become a core means of diagnosing and treating gastrointestinal diseases. As a key tool in endoscopic treatment, the injection needle is clinically used for gastrointestinal bleeding caused by esophageal and gastric varices, as well as for injecting targeted tissues during the treatment of other gastrointestinal-related diseases.

[0003] However, existing endoscopic injection needles typically involve a plunger that slides back and forth within a housing. The plunger has an elastic protrusion that engages with a positioning groove on the housing to control the insertion depth. In existing technology, the elastic protrusion of the plunger has insufficient elastic modulus, leading to engagement failure and a possibility of needle tip retraction during use. Furthermore, retraction requires holding the housing with one hand and pulling the plunger back to its original position with the other, which is laborious and inconvenient for the doctor, requiring them to use both hands. To address these issues, this patent presents an endoscopic injection needle. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an endoscopic injection needle that automatically locks during needle insertion through a mechanical structure, making it more reliable. When the needle is withdrawn, pressing a button automatically withdraws the needle, which can be operated with one hand, making it more convenient and faster and improving surgical efficiency.

[0005] The technical solution adopted by this invention to solve its existing problems is:

[0006] An endoscopic injection needle includes a housing, a push rod slidably connected to the housing, and an outer sheath installed at the end of the housing. The push rod has a hollow structure inside. A steel tube is installed at one end of the push rod inside the housing. 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. The push rod, steel tube, inner tube, and the inside of the injection needle form an injection channel.

[0007] A button assembly is provided between the push rod and the housing. The button assembly includes a button that can slide radially along the push rod, a first spring that allows the button to slide radially on its own, and a second spring that allows the push rod to reset on its own. The button assembly enables automatic locking or unlocking between the push rod and the housing.

[0008] The button is equipped with a second limiting rib, and the push rod is equipped with a second slot that matches it. After the push rod moves along the axial direction of the outer shell to the position of the second limiting rib, the second limiting rib is engaged in the second slot to form an axial limiting constraint, and the push rod can only advance the needle and cannot retract.

[0009] Preferably, the outer shell has a stepped hole structure inside, a first end face inside the outer shell, a buckle groove and a button through hole at the right end of the outer shell, and a radially arranged slot and a radially arranged guide rib inside the right end of the outer shell.

[0010] Preferably, a card holder is installed on the lower part of the right end of the outer casing. The card holder includes an elastic buckle that engages with the buckle groove, two inserts that slide with the slot, and a countersunk hole. A U-shaped groove is provided between the two inserts.

[0011] Preferably, a button is installed on the right end of the outer shell. The button includes a protrusion, an elongated hole, a first spring mounting seat, and a radially arranged sliding groove. The button is sleeved on the push rod through the elongated hole. The sliding groove is slidably connected to the guide rib of the outer shell. The protrusion protrudes from the surface of the outer shell through the button through hole. A second limiting rib is set on the elongated hole. The height dimension of the button inside the outer shell is lower than the height dimension of the button inside the outer shell. 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 countersunk hole of the card seat.

[0012] Preferably, the push rod has a sliding plane, a limiting surface, a second end face, and a handle portion arranged in a mirror configuration. The sliding plane extends all the way to the second slot. The sliding plane is slidably connected to the side of the U-shaped groove of the slot seat. The 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 outer shell. The handle portion is provided with a Luer connector.

[0013] Preferably, an end cap is installed on the outer shell, one end of which is interference-fitted to the outer shell, and the other end of which is interference-fitted to the outer sheath.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] This application boasts high ease of operation, allowing medical staff to easily perform drug injection and needle return with just one hand. Its ingenious design utilizes endoscopic technology for precise needle insertion control, ensuring accurate drug injection. During operation, the pop-up of the buttons provides not only intuitive visual feedback but also a clear "click," offering clear auditory confirmation and effectively reducing the possibility of misoperation. The unique locking and automatic return design significantly reduces the operational burden on medical staff, ensuring stability during injection and significantly enhancing patient safety. The overall design is compact and efficient, with all components working collaboratively to achieve efficient, stable, and reliable drug injection. It is widely applicable to various medical environments and needs. Through rapid and accurate needle insertion and return, this device helps shorten surgical time, improves the utilization efficiency of medical resources, and enhances the user experience for medical staff, reducing operational fatigue and stress. It is an innovative medical device that integrates safety, efficiency, and convenience. Attached Figure Description

[0016] Figure 1 This is a structural diagram of an endoscopic injection needle according to the present invention;

[0017] Figure 2 This is a full sectional front view of an endoscopic injection needle according to the present invention;

[0018] Figure 3 This is a partial enlarged view of point D in the full cross-sectional front view of an endoscopic injection needle of the present invention;

[0019] Figure 4 This is a top-section view of an endoscopic injection needle according to the present invention;

[0020] Figure 5 This is a partial enlarged view of point E in the top-section view of an endoscopic injection needle of the present invention;

[0021] Figure 6 This is a partial enlarged view at point F of the full cross-sectional top view of an endoscopic injection needle of the present invention;

[0022] Figure 7 This is a right-side cross-sectional view of an endoscopic injection needle according to the present invention;

[0023] Figure 8 This is a structural diagram of an endoscopic injection needle pusher according to the present invention;

[0024] Figure 9 This is a structural diagram of an endoscopic injection needle button according to the present invention;

[0025] Figure 10 This is a full sectional side view of an endoscopic injection needle button according to the present invention;

[0026] Figure 11This is a full sectional front view of an endoscopic injection needle housing according to the present invention;

[0027] Figure 12 This is a top view of an endoscopic injection needle housing according to the present invention;

[0028] Figure 13 This is a right view of an endoscopic injection needle housing according to the present invention;

[0029] Figure 14 This is a structural diagram of an endoscopic injection needle holder according to the present invention;

[0030] Figure 15 This is a structural diagram of another embodiment of an endoscopic injection needle push rod according to the present invention;

[0031] Figure 16 This is a structural diagram of another embodiment of the endoscopic injection needle button of the present invention;

[0032] Figure 17 This is a full sectional side view of another embodiment of the endoscopic injection needle button of the present invention.

[0033] In the picture:

[0034] 1. Outer shell; 101. Slot; 102. Button through hole; 103. Guide rib; 104. Snap-fit ​​groove; 105. First end face; 2. Button; 201. Protrusion; 202. Oblong hole; 203. First limiting rib; 204. First spring mounting seat; 205. Slide groove; 206. Second limiting rib; 3. Push rod; 301. First slot; 302. Sliding plane; 303. Limiting surface; 304. Second end face; 305. Handle part; 306. Luer connector; 307. Second slot; 4. First spring; 5. Snap-fit ​​seat; 501. Elastic snap-fit; 502. Insert block; 503. U-shaped groove; 504. Countersunk hole; 6. Second spring; 7. End cap; 8. Outer sheath; 9. Steel pipe; 10. Inner tube; 11. Injection needle. Detailed Implementation

[0035] This specification and claims do not distinguish components by differences in name, but by differences in function. In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "horizontal," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In this invention, unless otherwise expressly specified and limited, the terms "installed," "connected," "linked," "fixed," etc., should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] like Figures 1-17 An endoscopic injection needle is shown, including a housing 1, a push rod 3 slidably connected to the housing 1, and an outer sheath 8 installed at the end of the housing 1. The push rod 3 has a hollow structure inside. A steel tube 9 is installed at one end of the push rod 3 inside the housing 1. An inner tube 10 is sleeved on the steel tube 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 8. The push rod 3, the steel tube 9, the inner tube 10, and the injection needle 11 form an injection channel.

[0037] A button assembly is provided between the push rod 3 and the outer casing 1. The button assembly includes a button 2 that can slide radially along the push rod 3, a first spring 4 that allows the button 2 to slide radially on its own, and a second spring 6 that allows the push rod 3 to reset automatically. The button assembly realizes automatic locking or unlocking between the push rod 3 and the outer casing 1.

[0038] The button 2 is provided with a second limiting rib 206, and the push rod 3 is provided with a second slot 307 that matches it. After the push rod 3 moves along the axial direction of the outer shell 1 to the position of the second limiting rib 206, the second limiting rib 206 is engaged in the second slot 307 to form an axial limiting constraint, and the push rod 3 can only advance the needle and cannot retract.

[0039] The second limiting rib 206 has a triangular cross-section, and the second locking groove 307 has multiple consecutive triangular grooves. When the push rod 3 is pushed into the outer shell 1, the second limiting rib 206 engages with any of the triangular grooves of the second locking groove 307, and the injection needle 11 protrudes out of the outer sheath 8, thus enabling the injection needle 11 to be inserted. When the push rod 3 pushes the injection needle 11 into the shell, the second locking groove 307, with its multiple consecutive triangular grooves, allows the doctor to adjust the insertion depth according to the required needle length. During the insertion and retraction of the injection needle 11, the steel tube 9, the inner tube 10, and the injection needle 11 as a whole move with the push rod 3 within the outer shell 1 and the outer sheath 8.

[0040] The interior of the outer shell 1 has a stepped hole structure. The interior of the outer shell 1 has a first end face 105. The right end of the outer shell 1 has a buckle groove 104 and a key through hole 102. The interior of the right end of the outer shell 1 has a radially arranged slot 101 and a radially arranged guide rib 103.

[0041] A card holder 5 is installed on the lower right side of the outer casing 1. The card holder 5 includes an elastic buckle 501 that engages with the buckle groove 104, two insert blocks 502 that are slidably connected to the slot 101, and a countersunk hole 504. A U-shaped groove 503 is provided between the two insert blocks 502.

[0042] A button 2 is installed on the right end of the outer casing 1. The button 2 includes a protrusion 201, an elongated hole 202, a first spring mounting seat 204, and a radially arranged sliding groove 205. The button 2 is sleeved on the push rod 3 through the elongated hole 202. The sliding groove 205 is slidably connected to the guide rib 103 of the outer casing 1, allowing the button 2 to slide freely up and down along the guide rib 103. The protrusion 201 protrudes from the surface of the outer casing 1 through the button through hole 102. A second limiting rib 206 is provided on the elongated hole 202. The height dimension of the button 2 inside the outer casing 1 is lower than the height dimension of the inner surface of the outer casing 1, allowing the button 2 to move up and down within the outer casing 1. A first spring 4 is fitted onto the first spring mounting base 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 countersunk hole 504 of the card seat 5. When the needle is not inserted, the first spring 4 is in a highly compressed state. When the needle is inserted, although the first spring 4 bounces upward, it is still in a compressed state, always keeping the second limiting rib 206 of the button 2 abutting against the push rod 3. During use, this ensures that the injection needle 11 is stably in the inserted state and will not retract.

[0043] The push rod 3 has a mirror-image sliding plane 302, a limiting surface 303, a second end face 304, and a handle portion 305. The sliding plane 302 extends to the second slot 307 and is slidably connected to the side of the U-shaped groove 503 of the holder 5. When the push rod 3 advances to insert the needle, the sliding plane 302 acts as a guide, while the U-shaped groove 503 prevents the push rod 3 from rotating circumferentially during needle insertion. 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 face 304, and the other end of the second spring 6 abuts against the first end face 105 of the outer shell 1. When the needle is inserted, the second spring 6 is compressed, and when the needle is withdrawn, the push rod 3 is reset by the elastic force of the second spring 6. When the injection needle 11 is withdrawn, the limiting surface 303 abuts against the holder 5, limiting the push rod 3 and preventing it from coming out of the outer shell 1. The handle portion 305 has a Luer connector 306, which can be tightly connected to the syringe.

[0044] An end cap 7 is installed on the outer shell 1. One end of the end cap 7 is interference-fitted to the outer shell 1, and the other end of the end cap 7 is interference-fitted to the outer sheath tube 8 to prevent the outer sheath tube 8 from falling off.

[0045] The working principle of an endoscopic injection needle is as follows:

[0046] Injection preparation: The medical staff firmly grasps the outer shell 1 with one hand and steadily holds the handle 305 of the plunger 3 with the other hand. The plunger 3 is slowly pushed forward to the appropriate position inside the outer shell 1.

[0047] Locking and Needle Insertion: At this point, the second slot 307 on the push rod 3 is precisely aligned above the second limiting rib 206 of the button 2. Under the action of the first spring 4, the button 2 quickly springs upward, and the protrusion 201 protrudes from the button through hole 102 on the outer shell 1. Medical personnel can observe a clear spring-like phenomenon, accompanied by a crisp "click" sound. Through the endoscope, the doctor confirms that the needle tip of the injection needle 11 has successfully extended from the outer sheath 8. At this moment, the second limiting rib 206 of the button 2 and the second slot 307 of the push rod 3 are tightly engaged to achieve a locked state. In this state, the injection needle 11 is smoothly inserted. During the insertion process, the second spring 6 is in a compressed state. As needed, medical personnel can adjust the insertion depth through the second slot 307.

[0048] Injection and Needle Retraction: After the medication is injected, medical staff can retract the needle with just one hand. Gently press the protrusion 201 to disengage the second limiting rib 206 of the button 2 from the second slot 307 of the push rod 3. Then, under the strong elastic force of the second spring 6, the push rod 3 automatically and quickly returns to its initial position. At the same time, the extended injection needle 11 smoothly retracts into the outer sheath 8, completing the entire injection process.

[0049] 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 As shown, the second slot 307 of the push rod 3 is replaced with the first slot 301. The first slot 301 is a single rectangular slot. The second limiting rib 206 of the button 2 is replaced with the first limiting rib 203. The first limiting rib 203 has a rectangular cross section. When the needle is inserted, the first limiting rib 203 engages with the first slot 301. The rest of the structure and operation are the same as described above.

[0050] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit 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 (8) mounted on the end of the housing (1), characterized in that: The push rod (3) has a hollow structure inside. A steel pipe (9) is installed at one end of the push rod (3) inside the outer shell (1). An inner tube (10) is fitted 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 (8). The push rod (3), steel pipe (9), inner tube (10) and injection needle (11) form an injection channel. A button assembly is provided between the push rod (3) and the outer shell (1). The button assembly includes a button (2) that can slide radially along the push rod (3), a first spring (4) that can make the button (2) slide radially on its own, and a second spring (6) that can make the push rod (3) reset on its own. The button assembly realizes automatic locking or unlocking between the push rod (3) and the outer shell (1). The button (2) is provided with a second limiting rib (206), and the push rod (3) is provided with a second slot (307) that matches it. After the push rod (3) moves along the axial direction of the outer shell (1) to the position of the second limiting rib (206), the second limiting rib (206) is inserted into the second slot (307) to form an axial limiting constraint. The push rod (3) can only insert the needle and cannot retract. The shell (1) has a stepped hole structure inside. The shell (1) has a first end face (105) inside. The right end of the shell (1) has a buckle groove (104) and a key through hole (102). The right end of the shell (1) has a radially arranged slot (101) and a radially arranged guide rib (103). The lower part of the right end of the outer shell (1) is equipped with a card seat (5). The card seat (5) includes an elastic buckle (501) that engages with the buckle groove (104), two inserts (502) that slide with the slot (101), and a countersunk hole (504). A U-shaped groove (503) is provided between the two inserts (502). A button (2) is installed on the right end of the outer shell (1). The button (2) includes a protrusion (201), an elongated hole (202), a first spring mounting seat (204), and a radially arranged sliding groove (205). The button (2) is sleeved on the push rod (3) through the elongated hole (202). The sliding groove (205) is slidably connected to the guide rib (103) of the outer shell (1). The protrusion (201) protrudes from the surface of the outer shell (1) through the button through hole (102). The second limiting rib (206) is set on the elongated hole (202). The height dimension of the button (2) inside the outer shell (1) is lower than the height dimension inside the outer shell (1) where the button (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 to the button (2), and the other end of the first spring (4) abuts against the bottom surface of the countersunk hole (504) of the card seat (5). The push rod (3) is provided with a mirror-image sliding plane (302), a limiting surface (303), a second end face (304), and a handle (305). The sliding plane (302) extends all the way to the second slot (307). The sliding plane (302) is slidably connected to the side of the U-shaped groove (503) of the card seat (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 face (304), and the other end of the second spring (6) abuts against the first end face (105) of the outer shell (1). The handle (305) is provided with a Luer connector (306). When the needle insertion depth does not need to be adjusted, the second slot (307) of the push rod (3) is replaced with the first slot (301). The first slot (301) is a single rectangular slot. The second limiting rib (206) of the button (2) is replaced with the first limiting rib (203). The first limiting rib (203) is a rectangular cross section. When the needle is inserted, the first limiting rib (203) engages with the first slot (301).

2. The endoscopic injection needle according to claim 1, characterized in that: An end cap (7) is installed on the outer shell (1). One end of the end cap (7) is press-fitted to the outer shell (1), and the other end of the end cap (7) is press-fitted to the outer sheath (8).

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