A snare with injection function

Abstract

The present invention relates to the technical field of medical devices, and discloses a snare with an injection function, comprising a main body, a snare finger ring slidably arranged on the main body, a double-lumen sheath tube at one end of the main body, and an injection connector at the other end of the main body; a finger ring tube with an axial through hole is arranged at one end of the main body, the injection connector is slidably arranged in the axial through hole, an axial block is arranged on the injection connector, a first notch is opened on the axial block, a vertical through hole penetrating the axial through hole is opened on the finger ring tube, a reset clamping column is slidably arranged in the vertical through hole, a first clamping block and a second clamping block are arranged on the reset clamping column, a second notch is formed between the first clamping block and the second clamping block, a side of the first clamping block close to the second clamping block slides against the axial block, a button is fixedly connected to one end of the reset clamping column, a first elastic member is arranged between the button and the finger ring tube; a second elastic member is arranged between the injection connector and the axial through hole. The present invention can be operated with one hand, and the operation is simpler, more convenient and faster.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a snare with an injection function. Background Art

[0002] With the widespread development of endoscopic treatment, endoscopic EMR has become more popular. EMR, or endoscopic mucosal resection, is an endoscopic operation technique for flat raised lesions (early gastrointestinal cancer, flat adenomas) and broad-based sessile polyps. The lesions are separated from their lamina propria by endoscopic measures (injection and suction) to become false pedunculated polyps. Then, snare or electroresection techniques are used to peel off the mucosa where the lesions are located to achieve the purpose of treatment or to perform large tissue biopsies to assist in diagnosis.

[0003] In routine operations, doctors need to first insert an injection needle into the human body cavity through an endoscope, and inject (physiological saline or other liquids) under the diseased tissue to make the diseased tissue bulge. Then withdraw the injection needle from the endoscope, and insert the snare into the human body cavity through the endoscope to snare and peel off the raised diseased tissue. Some patients have multiple polyps in the digestive tract that need to be removed, which will cause the injection needle and snare to frequently go in and out of the endoscope. Changing instruments will invisibly increase the operation time, increase the workload of medical staff, and increase the risk of surgery.

[0004] In the prior art, the patent with authorization announcement number CN208404758U applied by the applicant discloses a snare with an injection needle, including a handle, a finger ring, an electrode seat, an injection tube, a snare head, a traction wire, an injection needle, a guide tube and a double-lumen sheath, the finger ring is slidably connected to the handle, the traction wire is passed through the double-lumen sheath, the proximal end of the traction wire is connected to the finger ring, the distal end of the traction wire is connected to the snare head, the guide tube is passed through the double-lumen sheath, the proximal end of the guide tube is connected to the injection tube, the distal end of the guide tube is connected to the injection needle, the injection tube is slidably connected to the handle, a push block is fixed on the injection tube, the injection tube and the push block slide along the second slide groove on the handle, and the proximal end of the double-lumen sheath is connected to the handle through an end cap.

[0005] This solution sets the injection needle and the snare in the same sheath, avoiding the tediousness of repeatedly entering and exiting the forceps channel, and combines the injection needle and the snare handle into one, which increases the convenience of surgical operation and improves surgical efficiency. However, the following problems still exist: when removing the needle, this solution requires medical personnel to hold the handle with one hand and push the fixed push block with the other hand to push the injection needle out using the fixed push block, which is more troublesome to operate. Summary of the invention

[0006] In view of this, an object of the present invention is to provide a snare with an injection function, which can be operated with one hand and is simpler, more convenient and faster to operate.

[0007] The present invention solves the above technical problems by the following technical means:

[0008] A snare with injection function, comprising a main body, the main body is a hollow structure, a snare finger ring is slidably arranged on the main body, one end of the main body is fixedly connected to a double-lumen sheath, the other end of the main body is arranged with an injection connector, an injection needle assembly is arranged in one lumen of the double-lumen sheath, a snare assembly is arranged in the other lumen of the double-lumen sheath, the snare assembly is electrically connected to an electrode seat, the snare head assembly is linked to the snare finger ring, the injection needle assembly is connected to the injection connector; a finger ring tube with an axial through hole is arranged at one end of the main body located at the injection connector, and the injection connector is slidably arranged on the injection connector. An axial block is arranged on the injection connector in the axial through hole of the finger ring tube, a first notch is opened on the axial block, a vertical through hole is opened on the finger ring tube and penetrates the axial through hole, a reset column is slidably arranged in the vertical through hole, a first block and a second block on the same straight line are arranged on the reset column, a second notch is formed between the first block and the second block, a side of the first block close to the second block slides against the axial block, a button is fixedly connected to one end of the reset column, a first elastic member is arranged between the button and the finger ring tube; a second elastic member is arranged between the injection connector and the axial through hole.

[0009] Furthermore, the side wall of the main body is provided with a first slide groove and a second slide groove, and the snare finger ring includes a slide cylinder, and the inner wall of the slide cylinder is provided with a first slider and a second slider slidably arranged in the first slide groove and the second slide groove. In this way, the slide cylinder is slidably arranged in the first slide groove by the first slider, and the second slider is slidably arranged in the second slide groove, thereby realizing stable sliding of the slide cylinder on the main body.

[0010] Furthermore, a wedge-shaped groove is provided on the side of the slide, a clamping groove is provided at the tail of the wedge-shaped groove, a finger ring buckle is fixedly connected to the end of the reset clamping column away from the button, and a clamping head cooperating with the clamping groove is provided at the tail of the finger ring buckle. When only the needle needs to be injected, the snare finger ring is slid to the tail, so that the clamping head on the finger ring buckle is just clamped in the clamping groove at the tail of the wedge-shaped groove, and the snare finger ring is fixed, so that when the needle is taken out, the movement of the snare finger ring can be avoided, causing the snare head to come out and affect the injection; when the needle is returned, when the button is pressed, the reset clamping column drives the finger ring buckle to move downward, so as to achieve the purpose of disengagement.

[0011] Furthermore, a blind hole perpendicular to the axial through hole of the finger ring tube is provided on the finger ring tube, the first elastic member is a first spring, a positioning column is provided on the side of the button close to the finger ring tube, one end of the first spring is sleeved on the positioning column, and the other end of the first spring is against the bottom of the blind hole. When the button is pressed, the positioning column and the blind hole can fix the two ends of the first spring to prevent the first spring from deflecting when contracting, thereby realizing the vertical stable pressing and rebounding of the button.

[0012] Furthermore, the number of the blind hole, the first spring and the positioning column are all two, the two positioning columns are symmetrically arranged on both sides of the reset column, the two first springs are respectively sleeved on the two positioning columns, and the two first springs are respectively arranged in the two blind holes. The two symmetrical positioning columns can prevent the key from being offset when being pressed down and bounced up, and the key can be pressed more smoothly.

[0013] Furthermore, the injection needle assembly includes an injection needle and a guide tube, the guide tube is connected between the injection connector and the injection needle; the snare assembly includes a snare head and a traction wire, the traction wire is fixedly connected between the snare head and the snare finger ring, and the traction wire is electrically connected to the electrode seat. The injection connector is used to connect an external syringe, and the injection liquid is injected from the injection needle to the diseased tissue through the injection connector and the guide tube in sequence; when the snare finger ring is slid, the snare head is controlled to enter and exit the double-lumen sheath through the traction wire.

[0014] Furthermore, the electrode holder is arranged on the snare finger ring, and the snare finger ring is a double snare finger ring. The double snare finger ring means that a finger ring is arranged on both sides of the slide cylinder. When in use, the index finger and middle finger of the medical staff can be respectively placed in the two finger rings, so that the clamping and fixing of the entire snare are more stable, which is conducive to the stability of the surgical operation; the motor is arranged on the snare finger ring for easy operation.

[0015] Furthermore, the main body is integrally formed with the finger ring tube, the hollow structure of the main body is connected with the axial through hole of the finger ring tube, a stepped hole is formed at the hollow structure of the main body and the through hole, the second elastic member is a second spring, one end of the second spring abuts against the stepped hole, and the other end of the second spring abuts against the injection connector. When the injection connector is pushed, the second spring is compressed, and when the injection connector needs to be retracted, the reset force of the second spring can drive the injection connector to reset.

[0016] Furthermore, a thumb ring is provided on the finger ring tube. When the ring is used out of the trap, the thumb of the medical staff can be put into the thumb ring for easy operation.

[0017] Beneficial effects of the present invention:

[0018] 1. The present invention integrates injection and snare on a snare. When in use, the index finger and the middle finger can be respectively placed in the two rings of the double snare finger ring, and the thumb can press the button, or push the injection connector, or put it into the thumb ring to fix the main body. The entire injection or snare can be operated with one hand, which is simpler and more convenient to operate.

[0019] 2. When removing the needle from the present invention, it is only necessary to push the injection connector in to a certain position, and the first clamping block will clamp the injection connector under the restoring force of the first spring. When returning the needle, it is only necessary to press the button so that the first clamping block loses its obstruction to the injection connector, and the injection connector is reset under the resetting force of the second spring. The whole process is very simple and quick, and the structure is also very simple, so smooth needle insertion and return can be achieved.

[0020] 3. When the needle is removed during injection, the snare finger ring can be slid toward the tail, so that the clamping head on the finger ring buckle is just clamped in the clamping groove at the tail of the wedge-shaped groove, and the snare finger ring is fixed. When the needle is removed, the movement of the snare finger ring can be avoided to cause the snare head to come out and affect the injection.

[0021] 4. The present invention can also perform injection when snaring, which is more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view structural schematic diagram of a snare with injection function of the present invention;

[0023] Figure 2 yes Figure 1 A schematic diagram of a top view structure;

[0024] Figure 3 It is a structural schematic diagram of the needle-out state;

[0025] Figure 4 It is a structural diagram of the needle return state;

[0026] Figure 5 It is a schematic diagram of the structure in the out-of-trap state;

[0027] Figure 6 It is a schematic diagram of the structure of the needle after the snare is removed;

[0028] Figure 7 yes Figure 1 Schematic diagram of the local structure of the injection joint and the reset clamp.

[0029] Among them, the main body 1, the double snare finger ring 2, the slide 3, the electrode seat 4, the double-lumen sheath 5, the injection connector 6, the injection needle 7, the guide tube 8, the snare head 9, the traction wire 10, the finger ring tube 11, the axial through hole 12, the thumb ring 13, the axial block 14, the first notch 15, the vertical through hole 16, the reset card column 17, the first card block 18, the second card block 19, the second notch 20, the button 21, the positioning column 22, the blind hole 23, the first spring 24, the second spring 25, the wedge groove 26, the card slot 27, the finger ring buckle 28, and the card head 29. DETAILED DESCRIPTION

[0030] The present invention will be described in detail below with reference to the accompanying drawings:

[0031] like Figure 1-7 As shown: a snare with injection function, including a main body 1, the main body 1 is a hollow structure, a double snare finger ring 2 is slidably arranged on the main body 1, in order to achieve stable sliding of the double snare finger ring 2 on the main body 1, a first slide groove and a second slide groove are opened on the side wall of the main body 1, the double snare finger ring 2 includes a slide cylinder 3, a finger ring is arranged on both sides of the slide cylinder 3, a first slide block and a second slide block slidably arranged in the first slide groove and the second slide groove are arranged on the inner wall of the slide cylinder 3, and an electrode seat 4 is arranged on the slide cylinder 3.

[0032] One end of the main body 1 is fixedly connected to a double-lumen sheath 5, and the other end of the main body 1 is provided with an injection connector 6. An injection needle assembly is provided in one lumen of the double-lumen sheath 5, and a snare assembly is provided in the other lumen of the double-lumen sheath 5. The injection needle assembly includes an injection needle 7 and a guide tube 8, and the guide tube 8 is connected between the injection connector 6 and the injection needle 7; the snare assembly includes a snare head 9 and a traction wire 10, and the traction wire 10 is fixedly connected between the snare head 9 and the double snare finger ring 2, and the traction wire 10 is electrically connected to the electrode seat 4.

[0033] A finger ring tube 11 with an axial through hole 12 is provided at one end of the main body 1 located at the injection joint 6, and a thumb ring 13 is provided on the finger ring tube 11. The injection joint 6 is slidably arranged in the axial through hole 12 of the finger ring tube 11, and an axial block 14 is provided on the injection joint 6. The axial block 14 is provided with a first notch 15. A vertical through hole 16 penetrating the axial through hole 12 is provided on the finger ring tube 11, and a reset column 17 is slidably arranged in the vertical through hole 16. The reset column 17 is provided with a first block 18 and a second block 19 on the same straight line, and a second notch 20 is formed between the first block 18 and the second block 19, and the side of the first block 18 close to the second block 19 slides against the axial block 14.

[0034] A button 21 is fixedly connected to one end of the reset column 17. Two positioning columns 22 are arranged on the side of the button 21 close to the finger ring tube 11. The two positioning columns 22 are symmetrically arranged on both sides of the reset column 17. Two blind holes 23 perpendicular to the axial through hole 12 of the finger ring tube 11 are opened on the finger ring tube 11. The two positioning columns 22 are sleeved with a first spring 24, and the other end of the first spring 24 is against the bottom of the blind hole 23. A wedge-shaped groove 26 is arranged on the side of the slide 3, and a clamping groove 27 is arranged at the tail of the wedge-shaped groove 26. A finger ring buckle 28 is fixedly connected to the end of the reset column 17 away from the button 21, and a clamping head 29 matching the clamping groove 27 is arranged at the tail of the finger ring buckle 28.

[0035] The main body 1 and the finger ring tube 11 are integrally formed, and the hollow structure of the main body 1 is connected to the axial through hole 12 of the finger ring tube 11. The hollow structure of the main body 1 and the through hole form a stepped hole, and a second spring 25 is arranged in the axial through hole 12. One end of the second spring 25 is against the stepped hole, and the other end of the second spring 25 is against the injection connector 6.

[0036] The method of use of the present invention is as follows:

[0037] In the initial state, the snare head 9 and the injection needle 7 are both in a reset state, that is, the snare head 9 and the injection needle 7 are located inside the double-lumen sheath 5. The index finger and middle finger of the medical staff can be respectively placed in the two finger rings of the double snare finger ring 2 to stably clamp and fix the entire snare, and the thumb can be placed in the thumb ring 13.

[0038] When the needle needs to be removed, the thumb can be removed from the thumb ring 13, and then the injection connector 6 is pushed forward from the rear end with the thumb. During the pushing process, the second spring 25 will be compressed. At this time, the first clamping block 18 slides on the axial block 14 on the injection connector 6, and the first spring 24 is in a compressed state. When the injection connector 6 is pushed to the first clamping block 18 and the first notch 15 of the axial block 14 in a straight line, the reset clamping column 17 will be under the reset force of the first spring 24, and the first clamping block 18 will be inserted into the first notch 15 of the axial block 14 on the injection connector 6, thereby clamping the injection connector 6. At this time, the injection needle 7 is also removed from the double-lumen sheath tube 5 as the injection connector 6 is pushed in, and the injection work can be performed. At this time, the clamping head 29 on the finger ring buckle 28 is also clamped into the clamping groove 27 in the wedge groove 26, fixing the double snare finger ring 2, so that when the needle is removed, the double snare finger ring 2 can be prevented from moving, causing the snare head 9 to come out and affect the injection.

[0039] When the injection is completed, the button 21 is pressed to move the reset column 17 downward. On the one hand, the reset column 17 drives the finger ring buckle 28 to move downward, so as to achieve the purpose of disengaging the finger ring buckle 28 from the double snare finger ring 2; on the other hand, when the reset column 17 moves downward, when the second notch 20 between the first block 18 and the second block 19 intersects with the first notch 15, the first block 18 loses its obstruction to the injection connector 6, and under the reset force of the second spring 25, the injection connector 6 is reset.

[0040] When it is necessary to remove the loop head 9, the loop head 9 is pushed forward by the double snare finger ring 2 to remove the double-lumen sheath 5 to perform the snare work. When the diseased tissue is not snare smoothly, or collapse due to lack of water occurs, the needle removal step is repeated to perform the injection work, that is, the needle can be removed for injection when the loop head 9 is removed.

[0041] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention. The techniques, shapes, and structural parts not described in detail in the present invention are all known technologies.

Claims

1. A snare with injection function, comprising a main body, the main body is a hollow structure, a snare finger ring is slidably arranged on the main body, one end of the main body is fixedly connected to a double-lumen sheath, the other end of the main body is provided with an injection connector, an injection needle assembly is arranged in one lumen of the double-lumen sheath, a snare assembly is arranged in the other lumen of the double-lumen sheath, the snare assembly is electrically connected to an electrode seat, the snare assembly is linked to the snare finger ring, and the injection needle assembly is connected to the injection connector; characterized in that: The main body is located at one end of the injection connector and is provided with a finger ring tube with an axial through hole. The injection connector is slidably arranged in the axial through hole of the finger ring tube. The injection connector is provided with an axial block, and the axial block is provided with a first notch. The finger ring tube is provided with a vertical through hole that penetrates the axial through hole. A reset column is slidably arranged in the vertical through hole. The reset column is provided with a first block and a second block on the same straight line, and a second notch is formed between the first block and the second block. A side of the first block close to the second block slides against the axial block. A button is fixedly connected to one end of the reset column, and a first elastic member is provided between the button and the finger ring tube; a second elastic member is provided between the injection connector and the axial through hole.

2. A snare with injection function according to claim 1, characterized in that: The side wall of the main body is provided with a first slide groove and a second slide groove, the snare finger ring comprises a slide cylinder, and the inner wall of the slide cylinder is provided with a first slider and a second slider slidably arranged in the first slide groove and the second slide groove.

3. A snare with injection function according to claim 2, characterized in that: A wedge-shaped groove is arranged on the side of the slide tube, a clamping groove is arranged at the tail of the wedge-shaped groove, a finger ring buckle is fixedly connected to the end of the reset clamping column away from the button, and a clamping head cooperating with the clamping groove is arranged at the tail of the finger ring buckle.

4. A snare with injection function according to claim 1, characterized in that: The finger ring tube is provided with a blind hole which is perpendicular to the axial through hole of the finger ring tube. The first elastic member is a first spring. A positioning column is provided on the side of the button close to the finger ring tube. One end of the first spring is sleeved on the positioning column, and the other end of the first spring is against the bottom of the blind hole.

5. A snare with injection function according to claim 4, characterized in that: The number of the blind hole, the first spring and the positioning column are all two, the two positioning columns are symmetrically arranged on both sides of the reset clamping column, the two first springs are respectively sleeved on the two positioning columns, and the two first springs are respectively arranged in the two blind holes.

6. A snare with injection function according to any one of claims 1 to 5, characterized in that: The injection needle assembly includes an injection needle and a guide tube, and the guide tube is connected between the injection connector and the injection needle; the snare assembly includes a snare head and a traction wire, and the traction wire is fixedly connected between the snare head and the snare finger ring, and the traction wire is electrically connected to the electrode seat.

7. The snare with injection function according to claim 6, characterized in that: The electrode seat is arranged on a snare finger ring, and the snare finger ring is a double snare finger ring.

8. The snare with injection function according to claim 7, characterized in that: The main body and the finger ring tube are integrally formed, the hollow structure of the main body is connected to the axial through hole of the finger ring tube, the hollow structure of the main body and the through hole form a stepped hole, the second elastic member is a second spring, one end of the second spring is against the stepped hole, and the other end of the second spring is against the injection connector.

9. The snare with injection function according to claim 6, characterized in that: A thumb ring is arranged on the finger ring tube.

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