CN218420024U - Endoscopic surgical instrument - Google Patents

Abstract

The utility model relates to the technical field of medical equipment, concretely relates to scope surgical instruments. An endoscopic surgical instrument comprising: one end of the shell is provided with a double-cavity sheath tube, and the double-cavity sheath tube is provided with a first cavity channel and a second cavity channel; the injection mechanism is arranged in the shell and comprises a needle head, an injection hose, an injection sliding block and an injector, the needle head is arranged in the first cavity, one end of the injection hose is connected with the needle head, the injection sliding block is arranged at the other end of the injection hose, and the other end of the injection hose is connected with the injector through a hole channel; the snare mechanism is arranged in the shell and comprises a snare, a metal wire, a snare sliding block and a pulling ring, the snare is arranged in the second cavity, and two ends of the metal wire are respectively connected with the snare and the snare sliding block. By combining the injector and the high-frequency snare, the operation time is shortened, the physical strength of an operator is saved, and the pain of a patient is reduced.

Description

Endoscopic surgical instrument

Technical Field

The utility model relates to the technical field of medical equipment, concretely relates to scope surgical instruments.

Background

Endoscopic Mucosal Resection (EMR) refers to an endoscopic approach to the diagnosis and treatment of superficial lesions of the gastrointestinal tract by endoscopic resection of mucosal lesions in whole or in parts. EMR can be classified into two basic types, non-attractive and attractive, with non-attractive being more common. The technical core of the non-suction method comprises two aspects of submucosal injection and endoscopic resection, and the method generally comprises the following operation steps: injecting physiological saline or epinephrine saline under the mucosa at the edge of the focus base by using an endoscopic injection needle, separating the physiological saline or the epinephrine saline from the submucosa, fully raising the physiological saline or the epinephrine saline to form a safe operation area, cutting off the lesion mucosa by using a high-frequency snare, and finally recovering the specimen to carry out pathological examination.

Because a digestive endoscope usually has only 1 instrument pore channel, an endoscope injection needle needs to be inserted firstly in the EMR operation process, and then the endoscope injection needle is pulled out after the injection is finished, and then the high-frequency snare is inserted, and the endoscope injection needle is pulled out after the focus is cut. When the pathological change parts of a patient are more, a large amount of operation time can be wasted by repeatedly pulling and inserting the endoscope instrument, and the pain of the patient caused by endoscope operation is increased. Meanwhile, repeated mechanical operations can aggravate fatigue of the operator, and increase the potential risk of the surgical operation.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model can waste a large amount of operation time pulling out and inserting the scope apparatus repeatedly, and repeated mechanical operation can make operative person's fatigue feel aggravation, has increased the defect of the potential risk of operation to an scope operation apparatus is provided.

In order to solve the above problem, the utility model provides an endoscopic surgery instrument, include:

the device comprises a shell, a first guide rail, a second guide rail and a third guide rail, wherein one end of the shell is provided with a double-cavity sheath tube, one end of the double-cavity sheath tube is arranged in the shell, and the double-cavity sheath tube is provided with a first cavity channel and a second cavity channel;

the injection mechanism is arranged in the shell and comprises a needle head, an injection hose, an injection sliding block and an injector, the needle head is arranged in the first cavity, the needle head is arranged at one end, far away from the shell, of the double-cavity sheath tube, the injection hose is arranged in the first cavity, one end of the injection hose is connected with the needle head, the injection sliding block is arranged at the other end of the injection hose, one end, far away from the injection hose, of the injection sliding block is provided with the injector, a hole channel is formed in the injection sliding block, the other end of the injection hose is connected with the injector through the hole channel, one end, provided with a finger support, of the injector is arranged outside the shell, and the injector is suitable for pushing the injection sliding block to enable the injection hose to move in the first cavity and enable the needle head to extend out of the first cavity;

the snare mechanism is arranged in the shell and arranged on the other side parallel to the injection mechanism, the snare mechanism comprises a snare, a metal wire, a snare slider and a pulling ring, the snare is arranged in the second cavity, the snare is arranged at one end, away from the shell, of the double-cavity sheath tube, the metal wire is arranged in the second cavity, two ends of the metal wire are respectively connected with the snare and the snare slider, the pulling ring is arranged at one end, away from the metal wire, of the snare slider, and the pulling ring is arranged on the outer side of the shell.

Further, the method also comprises the following steps: stop gear, stop gear sets up on the casing, stop gear includes slide, locking horizontal pole and couple, the slide sets up the both sides of casing, the setting of locking horizontal pole is in the both sides of injection slider, the locking horizontal pole with the slide cooperation, the locking horizontal pole is suitable for along the direction of slide removes, the couple rotationally sets up the both sides of casing are located the one end of slide, the couple is suitable for right the locking horizontal pole is fixed and spacing.

Furthermore, fixed finger rings are arranged on two sides of the shell.

Furthermore, stop gear still include dead lever, switching slider, connecting rod and spacing portion and with draw to drag to draw the ring setting in the same one side of casing, the dead lever with the switching slider sets up the both ends at the fixed ring of casing one side respectively, just the one end of dead lever runs through fixed ring with the switching slider is connected, the other end of switching slider is provided with spacing portion, spacing fixed the setting of portion is in on the casing, the switching slider with be provided with the pressure spring between the spacing portion, the both ends of connecting rod respectively with the switching slider with couple fixed connection.

Furthermore, a positioning hole is formed in the shell, one end of the connecting rod is connected with the switching sliding block, the other end of the connecting rod penetrates through the positioning hole to be connected with the hook, and the positioning hole is suitable for preventing the connecting rod from moving.

Furthermore, the injection mechanism further comprises a constraint rod, one end of the constraint rod penetrates through the shell and is inserted into the injection sliding block, a return spring is arranged on the constraint rod, and two ends of the return spring are fixedly connected with the injection sliding block and the shell respectively.

Furthermore, the electric connection assembly comprises a connection joint and a metal joint, one end of the metal joint penetrates through the shell and is inserted into the snare slider, the other end of the metal joint is provided with the connection joint, and the shell is provided with a strip-shaped through hole suitable for the electric connection assembly to slide.

Further, the method also comprises the following steps:

the casing with the one end that two-chamber sheath pipe is connected is provided with the connecting piece, the one end of two-chamber sheath pipe pass through the connecting piece with the casing is connected.

Furthermore, a metal pipe is arranged in the first cavity, the inner diameter of the metal pipe is larger than the outer diameter of the injection hose and smaller than the inner diameter of the first cavity, the injection hose is arranged in the metal pipe, and the metal pipe is suitable for fixing and supporting the injection hose.

Furthermore, the extending end of the first cavity is provided with a hollow screw, the inner diameter of the hollow screw is smaller than the outer diameter of the injection hose, and the hollow screw is used for limiting the injection hose and limiting the extending length of the needle head.

The utility model has the advantages of it is following:

1. the endoscope surgical instrument with the structure combines the injector and the high-frequency snare, and two independent cavity channels are arranged on the double-cavity sheath tube, so that the injection under the mucosa can be completed in the operation process, and the high-frequency snare excision operation can be completed, thereby solving the problem of repeatedly pulling and inserting the endoscope instrument, further shortening the operation time, saving the physical power of an operator, and reducing the pain brought to a patient.

2. The endoscope surgical instrument with the structure has the advantages that the limiting mechanism is arranged on the shell, so that the limiting mechanism can limit the injection sliding block, the injection sliding block cannot randomly shift in the injection process, and the needle head can only be in one of two states of stretching out and accommodating. Meanwhile, the limiting mechanism has the design of power storage and triggering, so that the reset can be triggered through a very simple action during use, and the safety of the operation is further ensured.

3. According to the endoscope surgical instrument with the structure, the fixed finger rings are arranged on the two sides of the shell, and the pulling finger rings are used for controlling the pulling slide block to move, so that an operator can finish all operations on the operating handle with one hand, the other hand is liberated, the operation of inserting and pricking needles can be performed, the operation is not compelling, the physical strength of an operator is further saved, and the safety of the operation is ensured.

4. The endoscopic surgical instrument with the structure has a mirror symmetry design, so that an operator can complete the same operation by the same action no matter using the left hand or the right hand for operation, different use scenes are considered, and different operation habits of the left handedness and the right handedness are also taken into consideration.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of an endoscopic surgical instrument according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of an endoscopic surgical instrument in an embodiment of the present invention;

FIG. 3 is a cross-sectional view of an endoscopic surgical instrument in an embodiment of the present invention;

fig. 4 is a sectional view of a double-lumen sheath according to an embodiment of the present invention;

description of reference numerals:

1. a housing; 11. fixing a ring; 2. a double-cavity sheath tube; 21. a first channel; 211. a metal tube; 22. a second channel; 3. an injection mechanism; 31. a needle head; 32. an injection hose; 33. an injection slide block; 331. a duct; 34. an injector; 35. a restraining bar; 36. a return spring; 4. a snare mechanism; 41. a snare; 42. a metal wire; 43. sleeving the sliding block; 44. pulling the finger ring; 5. a limiting mechanism; 51. a slideway; 52. locking the cross bar; 53. hooking; 54. pulling a rod; 55. a transfer slide block; 56. a connecting rod; 57. a limiting part; 58. a pressure spring; 59. positioning holes; 6. a power connection component; 61. connecting a joint; 62. a metal joint; 7. a strip-shaped through hole; 8. a connecting member.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

As shown in fig. 1 to 4, the present embodiment discloses an endoscopic surgical instrument comprising a housing 1, and an injection mechanism 3 and a snare mechanism 4 disposed within the housing 1. One end of the shell 1 is provided with a double-cavity sheath pipe 2, one end of the double-cavity sheath pipe 2 is arranged in the shell 1, the double-cavity sheath pipe 2 is provided with a first cavity channel 21 and a second cavity channel 22, the first cavity channel 21 is a circular pipeline, and the second cavity channel 22 is an oval pipeline. The injection mechanism 3 comprises a needle 31, an injection hose 32, an injection sliding block 33 and a syringe 34, wherein the needle 31 is arranged in the first cavity 21, the needle 31 is arranged at one end of the double-cavity sheath 2 far away from the shell 1, the injection hose 32 is arranged in the first cavity 21, one end of the injection hose 32 is connected with the needle 31, the injection sliding block 33 is arranged at the other end of the injection hose 32, one end of the injection sliding block 33 far away from the injection hose 32 is provided with the syringe 34, a hole 331 is formed in the injection sliding block 33, the other end of the injection hose 32 is connected with the syringe 34 through the hole 331, one end of the syringe 34 provided with a finger rest is arranged outside the shell 1, the injection sliding block 33 can relatively slide in the shell 1, and the syringe 34 can push the injection sliding block 33 to enable the injection hose 32 to move in the first cavity 21 and enable the needle 31 to extend out of the first cavity 21. The snare mechanism 4 is arranged on the other side of the injection mechanism 3 in parallel, the snare mechanism 4 comprises a snare 41, a metal wire 42, a snare slider 43 and a pulling ring 44, the snare 41 is arranged in the second cavity 22, the snare 41 is arranged at one end of the double-cavity sheath tube 2 far away from the shell 1, the metal wire 42 is arranged in the second cavity 22, two ends of the metal wire 42 are respectively connected with the snare 41 and the snare slider 43, a cavity is arranged in the snare slider 43, the metal wire 42 is arranged in the cavity and connected with the snare slider 43, the snare slider 43 can slide relatively in the shell 1, the metal wire 42 can move along with the snare slider 43 to enable the snare 41 to retract or extend out of the second cavity 22, the pulling ring 44 is arranged at one end of the snare slider 43 far away from the metal wire 42, and the pulling ring 44 is arranged outside the shell 1. Preferably, the pull ring 44 and the snare slider 43 are integrally formed. The snare 41 may be retracted into the second lumen 22 or extended out of the second lumen 22 by pushing or pulling on the pull finger ring 44, after which the snare 41 becomes oval when the snare 41 is extended out of the second lumen 22.

Further, as shown in fig. 2, the injection mechanism 3 further includes a restriction rod 35, one end of the restriction rod 35 penetrates through the housing 1 and is inserted into the injection slider 33, a return spring 36 is disposed on the restriction rod 35, and two ends of the return spring 36 are respectively fixedly connected to the injection slider 33 and the housing 1. The restriction lever 35 can move together with the injection slider 33, and the restriction lever 35 can improve the sliding stability of the injection slider 33 and determine the storage or extension state of the needle 31 according to the length of the leakage of the restriction lever 35.

Furthermore, two sides of the shell 1 are also provided with fixed finger rings 11.

Further, one end of the syringe 34 connected with the injection slider 33 is connected with a luer connector. It is noted that luer connection is a conventional technique in the art and is not described in detail here.

Further, one end of the metal wire 42 connected with the snare slider 43 is also provided with a reinforcing member, and the reinforcing member is used for increasing the connection strength between the metal wire 42 and the snare slider 43 and preventing the metal wire 42 and the snare slider 43 from slipping off.

Further, as shown in fig. 1, the housing 1 is further provided with a limit mechanism 5. The limiting mechanism 5 comprises a slide rail 51, a locking cross bar 52 and a hook 53, the slide rail 51 is arranged on two sides of the housing 1, the locking cross bar 52 is arranged on two sides of the injection sliding block 33, the locking cross bar 52 is matched with the slide rail 51, the locking cross bar 52 can move along with the injection sliding block 33 and move along the guiding direction of the slide rail 51, the hook 53 is rotatably arranged on two sides of the housing 1, in fig. 1, the hook 53 is positioned at the upper end of the slide rail 51, and the hook 53 is used for fixing and limiting the locking cross bar 52. When the locking crossbar 52 moves along the slide 51 to the hook 53 and lifts the hook 53, the hook 53 then restrains the locking crossbar 52 and restrains the injection slide 33.

Further, as shown in fig. 1, the limiting mechanism 5 further includes a pulling rod 54, a transfer slider 55, a connecting rod 56, and a limiting portion 57, and the pulling rod 54, the transfer slider 55, the connecting rod 56, and the limiting portion 57 are disposed on the same side of the housing 1 as the pulling finger ring 44. In fig. 1, a pulling rod 54 and a transfer slider 55 are respectively disposed at the upper and lower ends of the fixed ring 11 on the right side of the housing 1, one end of the pulling rod 54 penetrates through the fixed ring 11 on the right side to be connected with the transfer slider 55, the other end of the transfer slider 55 is provided with a limiting portion 57, the limiting portion 57 is fixedly disposed on the housing 1, a pressure spring 58 is disposed between the transfer slider 55 and the limiting portion 57, two ends of the pressure spring 58 are respectively fixedly connected with the transfer slider 55 and the limiting portion 57, two ends of a connecting rod 56 are respectively fixedly connected with the transfer slider 55 and a hook 53, and the connecting rod 56 can relatively move along with the transfer slider 55. By pushing the pulling rod 54 and moving the transfer slider 55 upward, the connecting rod 56 is driven to move, and the connecting rod 56 pushes the hook 53 and releases the position of the hook 53 on the locking cross rod 52. The pressure spring 36 releases the power to push the injection slide block 33, so that the needle 31 retracts into the double-cavity sheath 2. The pulling rod 54 is loosened, the pressure spring 58 stores power and releases, and the hook 53, the connecting rod 56, the switching slide block 55 and the pulling rod 54 are reset.

Preferably, in the present embodiment, the pulling rod 54 is a T-shaped rod.

Furthermore, the housing 1 is provided with a positioning hole 59, one end of the connecting rod 56 is connected with the transfer slider 55, the other end of the connecting rod 56 penetrates through the positioning hole 59 to be connected with the hook 53, and the positioning hole 59 can prevent the connecting rod 56 from moving transversely.

Further, as shown in fig. 1 and 2, a power connection assembly 6 is further included. The electric connection assembly 6 comprises a metal connector 62 and a connection connector 61, one end of the metal connector 62 penetrates through the shell 1 and is inserted into the snare slider 43 and is connected with the metal wire 42 arranged in the cavity of the snare slider 43, the other end of the metal connector 62 is provided with the connection connector 61, and the shell 1 is provided with a strip-shaped through hole 7 for the electric connection assembly 6 to slide. It should be noted that the power connection assembly 6 is structurally connectable to the output end of the hf electric knife, and the snare 41 is electrically connected to the hf electric knife main body through the conduction of the metal connector 62 and the metal wire 42, so as to have the hf electric cutting and electrocoagulation functions, which is a conventional technique in the art and will not be described in detail herein.

Furthermore, a connecting piece 8 is arranged at one end of the shell 1 connected with the double-cavity sheath tube 2, and one end of the double-cavity sheath tube 2 is connected with the shell 1 through the connecting piece 8.

Further, as shown in fig. 4, a metal tube 211 is disposed in the first channel 21, the inner diameter of the metal tube 211 is larger than the outer diameter of the injection hose 32, the injection hose 32 is disposed in the metal tube 211, and the metal tube 211 is used for fixing and supporting the injection hose 32, preventing the injection hose 32 from bending, and ensuring that the needle 31 can smoothly complete the forward and backward movement.

Preferably, the protruding end of the first channel 21 is further provided with a hollow screw, the inner diameter of the hollow screw is smaller than the outer diameter of the injection hose 32, and the hollow screw is used for limiting the injection hose 32 and limiting the protruding length of the needle 31.

Preferably, the surfaces of the double-cavity sheath tube 2 and the connecting piece 8 are provided with heat-shrinkable tubes, and the heat-shrinkable tubes wrap the double-cavity sheath tube 2 and the connecting piece 8 completely and reinforce the joint of the double-cavity sheath tube 2 and the connecting piece 8.

The implementation principle of the embodiment is as follows:

when the double-cavity sheath catheter is used, the needle 31 and the snare 41 are initially stored in the double-cavity sheath catheter 2, an operator inserts the double-cavity sheath catheter 2 into an instrument pore canal inlet of an endoscope handle and extends out of an instrument pore canal outlet of a tip part of the endoscope, an endoscope doctor controls the endoscope to send the front end of the double-cavity sheath catheter 2 to the position near a focus, fingers of the operator penetrate through the fixed finger ring 11 to fix the instrument handle, a thumb pushes a finger support of the injector 34 forwards until the locking cross rod 52 is hooked by the hook 53, the needle 31 extends out of the double-cavity sheath catheter 2 at the moment and pushes a push rod of the injector 34, liquid in the injector 34 is injected to a submucosal layer to form a liquid cushion, the focus is lifted immediately, then the operator pushes the pull rod 54, the hook 53 is lifted and releases the locking cross rod 52, the reset spring 36 pushes the injection slide block 33 back to an initial position, and the needle 31 is retracted into the double-cavity sheath catheter 2, so that the injection step is completed. The pulling rod 54 is loosened, the pressure spring 58 stores the force and releases the force, so that the hook 53, the connecting rod 56, the switching slide block 55 and the pulling rod 54 are reset. Then, the operator pushes the pulling ring 44 forward and pushes out the snare 41, the endoscopist adjusts the position of the snare 41 by using an endoscope so as to enable the snare 41 to be sleeved around a lesion to be resected, the operator can adjust the extending length of the snare 41, and the extending size of the snare 41 is adjusted by pulling the pulling ring 44 and the lesion is tightened. Finally, the electric knife is electrified, the current reaches the focus through the metal joint 62, the metal wire 42 and the snare 41, and forms a current loop through a negative plate of the body of the patient, so that the excision of the focus and the coagulation operation of the wound surface are completed.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications derived therefrom are intended to be within the scope of the invention.

Claims (10)

1. An endoscopic surgical instrument, comprising:

the device comprises a shell (1), wherein a double-cavity sheath (2) is arranged at one end of the shell (1), one end of the double-cavity sheath (2) is arranged in the shell (1), and the double-cavity sheath (2) is provided with a first cavity channel (21) and a second cavity channel (22);

the injection mechanism (3) is arranged in the shell (1), the injection mechanism (3) comprises a needle head (31), an injection hose (32), an injection sliding block (33) and an injector (34), the needle head (31) is arranged in the first cavity (21), the needle head (31) is arranged at one end, far away from the shell (1), of the double-cavity sheath (2), the injection hose (32) is arranged in the first cavity (21), one end of the injection hose (32) is connected with the needle head (31), the injection sliding block (33) is arranged at the other end of the injection hose (32), one end, far away from the injection hose (32), of the injection sliding block (33) is provided with the injector (34), a cavity (331) is arranged in the injection sliding block (33), the other end of the injection hose (32) is connected with the injector (34) through the cavity (331), one end, provided with a finger rest, of the injector (34) is arranged outside the shell (1), and the injector (34) is suitable for pushing the injection sliding block (33) to enable the injection hose (32) to extend out of the first cavity (21) and enable the needle head (21) to move;

the snare mechanism (4) is arranged in the shell (1) and arranged on the other side parallel to the injection mechanism (3), the snare mechanism (4) comprises a snare (41), a metal wire (42), a snare slider (43) and a pulling ring (44), the snare (41) is arranged in the second cavity (22), the snare (41) is arranged at one end, away from the shell (1), of the double-cavity sheath tube (2), the metal wire (42) is arranged in the second cavity (22), two ends of the metal wire (42) are respectively connected with the snare (41) and the snare slider (43), the pulling ring (44) is arranged at one end, away from the metal wire (42), of the snare slider (43), and the pulling ring (44) is arranged on the outer side of the shell (1).

2. An endoscopic surgical instrument according to claim 1, further comprising:

stop gear (5), stop gear (5) set up on casing (1), stop gear (5) include slide (51), locking horizontal pole (52) and couple (53), slide (51) set up the both sides of casing (1), locking horizontal pole (52) set up the both sides of injection slider (33), locking horizontal pole (52) with slide (51) cooperation, locking horizontal pole (52) are suitable for along the direction of slide (51) removes, couple (53) rotationally set up the both sides of casing (1) and are located the one end of slide (51), couple (53) are suitable for right locking horizontal pole (52) are fixed and spacing.

3. An endoscopic surgical device according to claim 2, wherein:

and fixed finger rings (11) are arranged on two sides of the shell (1).

4. An endoscopic surgical instrument according to claim 2 or 3, characterized in that:

limiting mechanism (5) still include dead lever (54), switching slider (55), connecting rod (56) and spacing portion (57) and with draw to drag ring (44) and set up the same one side in casing (1), dead lever (54) with switching slider (55) set up respectively at the both ends of the fixed ring (11) of casing (1) one side, just the one end of dead lever (54) runs through fixed ring (11) with switching slider (55) are connected, the other end of switching slider (55) is provided with spacing portion (57), spacing portion (57) are fixed to be set up on casing (1), switching slider (55) with be provided with pressure spring (58) between spacing portion (57), the both ends of connecting rod (56) respectively with switching slider (55) with couple (53) fixed connection.

5. An endoscopic surgical instrument according to claim 4, wherein:

the shell (1) is provided with a positioning hole (59), one end of the connecting rod (56) is connected with the switching sliding block (55), the other end of the connecting rod (56) penetrates through the positioning hole (59) to be connected with the hook (53), and the positioning hole (59) is suitable for preventing the connecting rod (56) from moving.

6. An endoscopic surgical device according to claim 5, wherein:

the injection mechanism (3) further comprises a constraint rod (35), one end of the constraint rod (35) penetrates through the shell (1) and is inserted into the injection sliding block (33), a return spring (36) is arranged on the constraint rod (35), and two ends of the return spring (36) are fixedly connected with the injection sliding block (33) and the shell (1) respectively.

7. An endoscopic surgical instrument according to claim 5, wherein:

the electric connection assembly (6) comprises a connection joint (61) and a metal joint (62), one end of the metal joint (62) penetrates through the shell (1) and is inserted into the snare slider (43), the other end of the metal joint (62) is provided with the connection joint (61), and the shell (1) is provided with a strip-shaped through hole (7) suitable for the electric connection assembly (6) to slide.

8. An endoscopic surgical instrument according to claim 7, further comprising:

casing (1) with the one end that two-chamber sheath pipe (2) are connected is provided with connecting piece (8), the one end of two-chamber sheath pipe (2) pass through connecting piece (8) with casing (1) are connected.

9. An endoscopic surgical instrument according to claim 8, wherein:

a metal tube (211) is arranged in the first cavity (21), the inner diameter of the metal tube (211) is larger than the outer diameter of the injection hose (32) and smaller than the inner diameter of the first cavity (21), the injection hose (32) is arranged in the metal tube (211), and the metal tube (211) is suitable for fixing and supporting the injection hose (32).

10. An endoscopic surgical device according to any one of claims 8 or 9, wherein:

the extension end of the first cavity (21) is further provided with a hollow screw, the inner diameter of the hollow screw is smaller than the outer diameter of the injection hose (32), and the hollow screw is used for limiting the injection hose (32) and limiting the extension length of the needle head (31).

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