A mucosal incision knife

Abstract

The present invention belongs to the technical field of medical devices, and specifically relates to a mucosal incision knife, including a blade head assembly, a driving mechanism, a resetting mechanism and a cleaning mechanism. The blade head assembly includes a blade seat and a blade head, a liquid outlet channel is opened inside the blade head, the driving mechanism includes a cable and a first elastic member arranged between the cable and the blade head, and the cleaning mechanism includes an outer scraper ring clamped between the blade head and the blade seat for scraping off adhesion tissue on the outer wall of the blade head and an inner cleaning needle fixed at the front end of the cable for clearing the liquid outlet channel of the blade head extending out of the blade seat; the present invention realizes the separation of the blade head assembly and the cable through the first elastic member and the second elastic member, and utilizes the safety distance between the first elastic member and the blade head to avoid the probability of accidental injury, thereby improving the safety of the operation, and further utilizes the outer scraper ring and the inner cleaning needle to respectively perform comprehensive self-cleaning on the outside and inside of the blade head, without the need to dismantle and use external cleaning equipment, thereby greatly shortening the operation time and improving the operation efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to a mucosal incision knife. Background Art

[0002] Endoscopic submucosal dissection is a medical procedure in which a mucosal incision knife is inserted into the patient's body through the forceps port of an endoscope, and the lesion site is marked under the endoscope before cutting.

[0003] A Chinese patent with application number CN201920919625.6 discloses a high-frequency electric cutting knife for endoscopic submucosal dissection, including a sheath tube and a pull cable arranged in the inner cavity of the sheath tube, a handle assembly is arranged at one end of the sheath tube, the handle assembly includes a main body and a pull ring slidably arranged on the main body, a knife body is arranged at the other end of the sheath tube, and the sheath tube is provided with a plug made of insulating material away from the handle assembly. The knife body includes a knife head and a knife rod arranged on the knife head, and the knife rod is rigidly connected to the pull cable through a pull tube. It can be seen from the accompanying drawings that when the knife head is in a retracted state, the knife head is still located outside the sheath tube. When the operator inserts the product into the endoscope, the pull ring must be hooked to prevent movement forward and backward. If there is movement, the pull ring may be accidentally touched. Even if the pull ring only moves a small distance, the pull ring will still directly push the knife head forward through the pull tube, causing accidental injury to the patient. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in order to solve the problem that the mucosal incision knife in the prior art must be hooked on the pull ring after inserting into the endoscope to prevent forward and backward movement, if there is movement, the pull ring may be accidentally touched, causing the knife head to extend and causing accidental injury to the patient, a mucosal incision knife is now provided.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solution: a mucosal incision knife, comprising:

[0006] The cutter head assembly comprises a cutter seat and a cutter head which can be extended or retracted into the cutter seat, wherein a liquid outlet channel for flushing liquid to flow out is provided inside the cutter head along its axial direction;

[0007] A driving mechanism, which is used to drive the cutter head to extend out of the cutter seat, comprises a cable and a first elastic member arranged between the cable and the cutter head, wherein one end of the first elastic member is fixed to the cable as a fixed end, and the other end is a suspended end, and a safety distance is left between the suspended end and the cutter head. After the cable drives the first elastic member to move forward a safety distance, the suspended end of the first elastic member contacts the cutter head and applies a thrust to the cutter head under the continuous push of the cable to make it extend out of the cutter seat. The safety distance is a distance that allows errors. At this time, even if an error occurs and the cable moves forward, the cutter head is not forced to extend due to the existence of the safety distance, so that no accidental injury will be caused, thereby improving the safety of the operation;

[0008] A reset mechanism, used for driving the cutter head to retract into the cutter seat, comprising a second elastic member arranged between the cutter seat and the cutter head, and used for driving the cutter head to retract into the cutter seat after the first elastic member is separated from the cutter head;

[0009] And a cleaning mechanism, including an outer scraper ring clamped between the cutter head and the cutter seat for scraping off the adhesion tissue on the outer wall of the cutter head and an inner cleaning needle fixed at the front end of the cable for moving axially along the liquid outlet channel when the cable drives the first elastic member to compress so as to clear the liquid outlet channel of the cutter head extending out of the cutter seat; when the cutter head moves back and forth, relative movement is generated between the outer scraper ring and the cutter head so that the adhesion tissue on the outer wall of the cutter head can be scraped off; when the first elastic member is gradually compressed, the cutter head has been extended to the longest distance and its position has not changed, and relative displacement is generated between the inner cleaning needle and the cutter head so as to clear the liquid outlet channel.

[0010] When in use, the mucosal cutter is inserted into the patient's body through the forceps opening of the endoscope, and the pull cable is pushed. After the pull cable drives the first elastic member to move forward a safe distance, the suspended end of the first elastic member contacts the knife head and applies a thrust to the knife head under the continuous push of the pull cable to make it extend out of the knife seat for cutting. When the cutting is stuck, the pull cable is retracted and the knife head is retracted through the second elastic member. The adhesion tissue on the outer wall of the knife head is removed by the outer scraper ring. When the liquid outlet channel is blocked, the pull cable can continue to be pushed, the first elastic member is compressed, and the knife head and the inner pass needle can be relatively displaced. The inner pass needle moves forward to clear the liquid outlet channel, ensuring that the liquid outlet channel is unobstructed and the flushing angle is clearer.

[0011] The above technical solution realizes the separation of the cutter head assembly and the cable through the first elastic member and the second elastic member, and utilizes the safe distance between the first elastic member and the cutter head to avoid the probability of accidental injury, thereby improving the safety of the operation. In addition, the outer scraper ring and the inner pass needle are used to perform comprehensive self-cleaning of the outside and inside of the cutter head respectively, without the need for dismantling and using external cleaning equipment, which greatly shortens the operation time and improves the operation efficiency.

[0012] Furthermore, a sleeve is provided between the cutter head and the cutter seat, the sleeve and the cutter head are detachably fixed, and a limiting step radially protrudes from the outer wall of the sleeve. When the limiting step abuts against the rear end of the cutter seat, the cutter head is extended to the longest length at this time. The cable continues to move forward, and while the first elastic member is compressed, the inner needle moves forward along the liquid outlet channel to clear it.

[0013] Furthermore, the driving mechanism also includes a core rod and a slip ring slidably sleeved on the core rod, an outer tube is connected between the core rod and the knife seat, an injection seat and an electrode seat are provided on the slip ring, the pull cable includes a connecting tube fixed to the inner needle and a pulling wire provided between the connecting tube and the electrode seat, and the outer sleeve of the pull cable is provided with an inner tube, and a gap is provided between the outer wall of the pull cable and the inner wall of the inner tube to form a liquid inlet channel. When the slip ring drives the pull cable forward to make the connecting tube dock with the liquid outlet channel, the injection seat, the liquid inlet channel, the connecting tube and the liquid outlet channel are connected in sequence, and the flushing liquid injected into the injection seat reaches the lesion site after passing through the liquid inlet channel, the connecting tube and the liquid outlet channel in sequence.

[0014] Furthermore, a positioning mechanism for positioning the cutter head is provided between the core rod and the slip ring, which includes a spring sheet fixed inside the core rod, a movable rod elastically arranged at the front end of the spring sheet, and a fixed rod fixedly arranged at the rear end of the spring sheet, the movable rod is snap-fitted with a positioning groove provided on the inner wall of the slip ring, and the fixed rod is snap-fitted with the rear end face of the slip ring.

[0015] Furthermore, there are two positioning grooves, which are divided into a front positioning groove A located at the front end and a rear positioning groove B located at the rear end. When the movable rod cooperates with the front positioning groove A, it corresponds to the retracted state of the cutter head. When the movable rod cooperates with the rear positioning groove B, it corresponds to the extended state of the cutter head. When the fixed rod cooperates with the rear end face of the slip ring, it corresponds to the unblocking state of the internal needle.

[0016] Furthermore, the inner wall of the outer scraper ring protrudes radially with a plurality of teeth arranged at intervals and used to scrape off tissue adhered to the surface of the cutter head. When the cutter head and the outer scraper ring produce relative movement, the teeth contact the outer wall of the cutter head to scrape off the tissue thereon to avoid getting stuck with the cutter head.

[0017] Furthermore, the connecting tube is provided with a plug-in portion for inserting into the liquid outlet channel to achieve connection between the two, and the outside of the plug-in portion is provided with a sealing member for forming a seal between the outer wall of the plug-in portion and the inner wall of the liquid outlet channel. The sealing member can ensure that the flushing liquid flowing into the liquid outlet channel from the connecting tube can only flow forward to the lesion site, and cannot flow backward out of the blade head assembly.

[0018] Furthermore, the first elastic member is a variable diameter spring, and its fixed end is a small diameter end, the suspended end is a large diameter end, and the rear end of the sleeve is a conical surface that cooperates with the variable diameter spring and is larger at the front and smaller at the rear, for abutting against the first elastic member.

[0019] Furthermore, a plurality of guide posts are axially extended from the front end of the sleeve, and a plurality of guide grooves for inserting the guide posts are formed on the inner wall of the knife seat, and the guide posts cooperate with each other to realize the sliding connection between the sleeve and the knife seat.

[0020] Furthermore, a boss is protruded from the outer wall of the cutter head, and the second elastic member is located between the outer scraper ring and the boss.

[0021] The beneficial effects of the present invention are as follows: the present invention realizes the separation setting of the cutter head assembly and the cable through the first elastic member and the second elastic member, and utilizes the safety distance between the first elastic member and the cutter head to avoid the probability of accidental injury, thereby improving the safety of the operation. In addition, the outer scraper ring and the inner pass needle are used to perform comprehensive self-cleaning of the outside and inside of the cutter head respectively, without the need for dismantling and using external cleaning equipment, thereby greatly shortening the operation time and improving the operation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0023] Figure 1 It is a schematic structural diagram of the cutter head of the present invention in a retracted state;

[0024] Figure 2 yes Figure 1 A partial enlarged view of part A;

[0025] Figure 3 yes Figure 1 A partial enlarged view of part B;

[0026] Figure 4 It is a structural schematic diagram of the cutter head of the present invention in an extended state;

[0027] Figure 5 yes Figure 4 A partial enlarged view of part C in the middle;

[0028] Figure 6 yes Figure 4 A partial enlarged view of part D in the middle;

[0029] Figure 7 It is a structural schematic diagram of the present invention in a dredging state;

[0030] Figure 8 yes Figure 7 A partial enlarged view of part E in the middle;

[0031] Fig. 9 yes Figure 7 A partial enlarged view of part F in the middle;

[0032] Fig.10 It is a three-dimensional schematic diagram of the positioning mechanism;

[0033] Fig.11 It is the main view of the outer scraper ring;

[0034] Fig.12 It is a front view of the cutter head assembly and the cable when the cutter head is in the extended state;

[0035] Fig.13 It is an exploded view of the cooperation between the cutter head assembly and the cable when the cutter head is in the extended state;

[0036] In the figure:

[0037] 1. Cutter head assembly; 101. Cutter seat; 1011. Guide groove; 1012. Clamping groove; 102. Cutter head; 1021. Liquid outlet channel; 1022. Boss; 103. Sleeve; 1031. Position limiting step; 1032. Conical surface; 1033. Guide column;

[0038] 2. driving mechanism; 201. connecting tube; 2011. plug-in portion; 2012. through groove; 2013. through hole; 202. traction wire; 203. first elastic member; 2031. fixed end; 2032. suspension end; 204. core rod; 2041. mounting groove; 205. slip ring; 2051A. front positioning groove; 2051B. rear positioning groove; 2052. rear end face;

[0039] 3. Reset mechanism;

[0040] 4. Cleaning mechanism; 401. External scraper ring; 4011. Tooth; 4012. Center hole; 4013. Elastic deformation groove; 4014. Clamping hole; 402. Internal pass needle;

[0041] 5. Positioning mechanism; 501. Spring piece; 502. Movable rod; 5021. Positioning ball head; 503. Fixed rod; 5031. Positioning column; 504. Compression spring;

[0042] 6. Liquid injection seat;

[0043] 7. Electrode holder;

[0044] 8. Inner tube;

[0045] 9. Liquid inlet channel;

[0046] 10. Seals;

[0047] 11. External control. DETAILED DESCRIPTION

[0048] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0049] The “front end” in this application refers to the end close to the lesion, and the “rear end” refers to the end close to the operator.

[0050] Embodiment 1:

[0051] like Figure 1-Figure 13 As shown, the present invention is a mucosal incision knife, comprising a knife head assembly 1, a driving mechanism 2, a resetting mechanism 3 and a cleaning mechanism 4;

[0052] The cutter head assembly 1 comprises a cutter seat 101 and a cutter head 102 which can be extended or retracted into the cutter seat 101, a liquid outlet channel 1021 for flushing liquid to flow out is provided inside the cutter head 102 along its axial direction, and a sleeve 103 is provided between the cutter head 102 and the cutter seat 101, the sleeve 103 and the cutter head 102 are detachably fixed, and the sleeve 103 and the cutter seat 101 are slidably connected, a plurality of guide posts 1033 are axially extended from the front end of the sleeve 103, a plurality of guide grooves 1011 for the guide posts 1033 to be inserted are provided on the inner wall of the cutter seat 101, the guide posts 1033 cooperate with the guide posts 1033, and a limiting step 1031 for limiting the extension length of the cutter head 102 is radially protruded from the outer wall of the sleeve 103;

[0053] The driving mechanism 2 is used to drive the cutter head 102 to extend out of the cutter seat 101. The driving mechanism 2 includes a core rod 204, a slip ring 205 slidably sleeved on the core rod 204, a cable fixed to the front end of the slip ring 205, and a first elastic member 203 arranged between the cable and the cutter head 102. An outer tube 11 is connected between the core rod 204 and the cutter seat 101 to fix the cutter seat 101.

[0054] One end of the first elastic member 203 is fixed to the cable as a fixed end 2031, and the other end is a suspended end 2032. A safety distance is left between the suspended end 2032 and the knife head 102. After the cable drives the first elastic member 203 to move forward the safety distance, the suspended end 2032 of the first elastic member 203 contacts the knife head 102 and applies a thrust to the knife head 102 under the continuous push of the cable to make it extend out of the knife seat 101. The safety distance is the distance allowable for error. At this time, even if an error occurs and the cable moves forward, due to the existence of the safety distance, the knife head 102 is not forced to extend, so it will not cause accidental injury, thereby improving the safety of the operation; the first elastic member 203 is a variable diameter spring, whose fixed end 2031 is a small diameter end, and the suspended end 2032 is a large diameter end, and the rear end of the sleeve 103 is a conical surface 1032 with a larger front and a smaller rear that cooperates with the variable diameter spring, which is used to abut against the first elastic member 203.

[0055] The resetting mechanism 3 is used to drive the cutter head 102 to retract to the cutter seat 101, and includes a second elastic member arranged between the outer scraper ring 401 and a boss 1022 protruding from the outer wall of the cutter head 102, and is used to drive the cutter head 102 to retract to the cutter seat 101 after the first elastic member 203 is separated from the cutter head 102;

[0056] The cleaning mechanism 4 includes an outer scraper ring 401 clamped between the cutter head 102 and the cutter seat 101 for scraping off the adhesion tissue on the outer wall of the cutter head 102, and an inner needle 402 fixed at the front end of the cable for axially moving along the liquid outlet channel 1021 when the cable drives the first elastic member 203 to be compressed so as to clear the liquid outlet channel 1021 of the cutter head 102 extending out of the cutter seat 101; when the limiting step 1031 abuts against the rear end of the cutter seat 101, this is the longest length of the cutter head 102 extended, the cable continues to move forward, and while the first elastic member 203 is compressed, a relative displacement is generated between the inner needle 402 and the cutter head 102, and the inner needle 402 moves forward along the liquid outlet channel 1021 to clear it.

[0057] The inner wall of the tool holder 101 is provided with a slot 1012 for the outer scraper ring 401 to be inserted into, and the central part of the outer scraper ring 401 is provided with a center hole 4012 for the tool head 102 to pass through, and the outer scraper ring 401 is provided with an elastic deformation slot 4013 connected with the center hole 4012 along its radial direction. The outer scraper ring 401 can be tightened or reset through the elastic deformation slot 4013, and clamping holes 4014 for clamps to be inserted are provided on both sides of the elastic deformation slot 4013. During installation, the clamp is extended into the two clamping holes 4014 to tighten the outer scraper ring 401. At this time, the elastic deformation slot 4013 is reduced, and then the outer scraper ring 401 is placed in the slot 1012, and finally the clamp is pulled out. At this time, the elastic deformation slot 4013 is reset, and the outer scraper ring 401 is released, so that the outer scraper ring 401 is inserted into the slot 1012 to achieve clamping connection with the slot 1012.

[0058] The inner wall of the outer scraper ring 401 is radially protruded with a plurality of teeth 4011 which are arranged at intervals and are used to scrape off tissue adhered to the surface of the cutter head 102. The plurality of teeth 4011 are circumferentially distributed to form an annular comb tooth structure. When the cutter head 102 and the outer scraper ring 401 generate relative motion, the teeth 4011 contact the outer wall of the cutter head 102 to scrape off the tissue thereon, and the tooth 4011 structure can avoid getting stuck with the cutter head 102.

[0059] The slip ring 205 is provided with an injection seat 6 and an electrode seat 7, the pull cable includes a connecting tube 201 fixed to the inner needle 402 and a traction wire 202 arranged between the connecting tube 201 and the electrode seat 7, and the outer sleeve of the pull cable is provided with an inner tube 8, and there is a gap between the outer wall of the pull cable and the inner wall of the inner tube 8 to form a liquid inlet channel 9. When the slip ring 205 drives the pull cable forward to connect the connecting tube 201 with the liquid outlet channel 1021, the injection seat 6, the liquid inlet channel 9, the connecting tube 201 and the liquid outlet channel 1021 are connected in sequence, and the flushing liquid injected into the injection seat 6 reaches the lesion site after passing through the liquid inlet channel 9, the connecting tube 201 and the liquid outlet channel 1021 in sequence.

[0060] The connecting tube 201 includes a tube body at the rear end and a plug-in portion 2011 at the front end for inserting into the liquid outlet channel 1021 to achieve the connection between the two. The tube body is provided with a through groove 2012 for connecting the tube cavity and the liquid inlet channel 9. The plug-in portion 2011 is provided with a through hole 2013 for connecting the tube cavity and the liquid outlet channel 1021. The plug-in portion 2011 at the rear end of the through hole 2013 is provided with a sleeve for forming a seal between the outer wall of the plug-in portion 2011 and the inner wall of the liquid outlet channel 1021. The sealing member 10 can ensure that the flushing liquid flowing into the liquid outlet channel 1021 from the connecting tube 201 can only flow forward to the lesion site, but cannot flow backward out of the cutter head assembly 1. In addition, a step surface for abutting against the connecting tube 201 is provided at the rear end of the liquid outlet channel 1021, so as to limit the axial displacement of the inner needle 402 and prevent it from extending out of the cutter head 102 and injuring the tissue. The surface of the inner needle 402 is roughened to increase the friction with the blocked tissue in the liquid outlet channel 1021, thereby enhancing the dredging effect.

[0061] A positioning mechanism 5 for positioning the cutter head 102 is provided between the core rod 204 and the slip ring 205, and includes a spring sheet 501 fixed inside the core rod 204, a movable rod 502 elastically arranged at the front end of the spring sheet 501, and a fixed rod 503 fixedly arranged at the rear end of the spring sheet 501. A mounting groove 2041 for installing the spring sheet 501 is provided inside the core rod 204, and the movable rod 502 is snap-fitted with the positioning groove provided on the inner wall of the slip ring 205. Under the elastic force of the spring sheet 501, the fixed rod 503 can extend out of the mounting groove 2041 and snap-fitted with the rear end face 2052 of the slip ring 205.

[0062] Specifically, the positioning grooves have two groups, which are divided into a front positioning groove 2051A located at the front end and a rear positioning groove 2051B located at the rear end. In the initial state, the movable rod 502 is engaged with the front positioning groove 2051A, and the cutter head 102 is in a retracted state. When the slip ring 205 drives the cable to move forward, the movable rod 502 gradually disengages from the front positioning groove 2051A, and the cutter head 102 gradually extends out. When the movable rod 502 enters the rear positioning groove 2051B, it is the longest extension length of the cutter head 102, and marking or cutting can be performed at this time. When the liquid outlet channel 1021 is blocked, the slip ring 205 is continuously pushed forward. At this time, the first elastic member 203 is compressed, and the movable rod 502 gradually disengages from the rear positioning groove 2051B until the connecting tube 201 abuts against the step surface, and at the same time, the fixed rod 503 extends out of the mounting groove 2041 and abuts against the rear end face 2052 of the slip ring 205. During the process, the inner needle 402 moves forward to clear the liquid outlet channel 1021.

[0063] The spring sheet 501 is enclosed to form a V-shaped structure, and its front end is an open end and the rear end is a closed end. The fixed rod 503 is located at the open end, so that the fixed rod 503 has greater elasticity to cooperate with the rear end surface 2052 of the slip ring 205. There are two fixed rods 503, and the two fixed rods 503 are symmetrically arranged along the longitudinal center axis of the core rod 204, and a compression spring 504 is arranged between the two. There are two movable rods 502, and the two movable rods 502 are symmetrically arranged along the longitudinal center axis of the core rod 204, and a compression spring 504 is also arranged between the two. The head of the movable rod 502 is a positioning ball head 5021 that cooperates with the positioning groove, and the head of the fixed rod 503 is a positioning column 5031, and the axis of the positioning column 5031 is arranged to intersect with the axis of the fixed rod 503.

[0064] Working principle:

[0065] When in use, the mucosal cutter is inserted into the patient's body through the forceps opening of the endoscope, and the pull cable is pushed. After the pull cable drives the first elastic member 203 to move forward a safe distance, the suspended end 2032 of the first elastic member 203 contacts the knife head 102 and applies a thrust to the knife head 102 under the continuous push of the pull cable, so that it extends out of the knife holder 101 to cut the lesion. When the cutting is stuck, the pull cable is retracted, and the knife head 102 retracts through the second elastic member. The knife head 102 and the outer scraper ring 401 produce relative movement, and the adhesion tissue on the outer wall of the knife head 102 is removed through the outer scraper ring 401. When the liquid outlet channel 1021 is blocked, the pull cable can continue to be pushed, the first elastic member 203 is compressed, and the knife head 102 and the inner pass needle 402 can be relatively displaced. The inner pass needle 402 moves forward to clear the liquid outlet channel 1021, ensuring that the liquid outlet channel 1021 is unobstructed and the flushing angle is clearer.

[0066] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A mucosal incision knife, characterized in that: include: A cutter head assembly (1) comprises a cutter seat (101) and a cutter head (102) which can be extended or retracted from the cutter seat (101), wherein a liquid outlet channel (1021) is provided inside the cutter head (102) along its axial direction for flushing liquid to flow out; A driving mechanism (2) for driving a cutter head (102) to extend out of a cutter seat (101), comprising a cable and a first elastic member (203) arranged between the cable and the cutter head (102); one end of the first elastic member (203) is fixed to the cable as a fixed end (2031), and the other end is a suspended end (2032); a safety distance is left between the suspended end (2032) and the cutter head (102); after the cable drives the first elastic member (203) to move forward a safety distance, the suspended end (2032) of the first elastic member (203) contacts the cutter head (102) and applies a thrust to the cutter head (102) under the continuous push of the cable to make it extend out of the cutter seat (101); A reset mechanism (3) for driving the cutter head (102) to retract into the cutter seat (101), comprising a second elastic member arranged between the cutter seat (101) and the cutter head (102), and for driving the cutter head (102) to retract into the cutter seat (101) after the first elastic member (203) is separated from the cutter head (102); and a cleaning mechanism (4), comprising an outer scraper ring (401) clamped between the cutter head (102) and the cutter seat (101) for scraping off tissue adhered to the outer wall of the cutter head (102), and an inner cleaning needle (402) fixed to the front end of the cable for axially moving along the liquid outlet channel (1021) to clear the liquid outlet channel (1021) of the cutter head (102) extending out of the cutter seat (101) when the cable drives the first elastic member (203) to be compressed; A sleeve (103) is provided between the cutter head (102) and the cutter seat (101); the sleeve (103) and the cutter head (102) are detachably fixed, and a limiting step (1031) radially protrudes from the outer wall of the sleeve (103); when the limiting step (1031) abuts against the rear end of the cutter seat (101), the cable continues to move forward, and the first elastic member (203) is compressed while the inner needle (402) moves forward along the liquid outlet channel (1021) to clear it.

2. A mucosal incision knife according to claim 1, characterized in that: The driving mechanism (2) further comprises a core rod (204) and a slip ring (205) slidably sleeved on the core rod (204); a liquid injection seat (6) and an electrode seat (7) are arranged on the slip ring (205); the pull cable comprises a connecting tube (201) fixed to the inner needle (402) and a pulling wire (202) arranged between the connecting tube (201) and the electrode seat (7); an inner tube (8) is sleeved on the outside of the pull cable; a gap is provided between the outer wall of the pull cable and the inner wall of the inner tube (8) to form a liquid inlet channel (9); when the connecting tube (201) is docked with the liquid outlet channel (1021), the liquid injection seat (6), the liquid inlet channel (9), the connecting tube (201) and the liquid outlet channel (1021) are sequentially connected.

3. A mucosal incision knife according to claim 2, characterized in that: A positioning mechanism (5) for positioning the cutter head (102) is provided between the core rod (204) and the slip ring (205), comprising a spring sheet (501) fixed inside the core rod (204), a movable rod (502) elastically arranged at the front end of the spring sheet (501), and a fixed rod (503) fixedly arranged at the rear end of the spring sheet (501), the movable rod (502) being snap-fitted with a positioning groove provided on the inner wall of the slip ring (205), and the fixed rod (503) being snap-fitted with a rear end surface (2052) of the slip ring (205).

4. A mucosal incision knife according to claim 3, characterized in that: There are two positioning grooves, namely a front positioning groove (2051A) located at the front end and a rear positioning groove (2051B) located at the rear end. The movable rod (502) cooperates with the front positioning groove (2051A) to correspond to the retracted state of the cutter head (102), and the movable rod (502) cooperates with the rear positioning groove (2051B) to correspond to the extended state of the cutter head (102). The fixed rod (503) cooperates with the rear end surface (2052) of the slip ring (205) to correspond to the unblocking state of the internal needle (402).

5. The mucosal incision knife according to claim 1, characterized in that: The inner wall of the outer scraper ring (401) is radially protruded with a plurality of teeth (4011) arranged at intervals and used for scraping off tissue adhered to the surface of the blade head (102).

6. A mucosal incision knife according to claim 2, characterized in that: The connecting pipe (201) is provided with a plug-in portion (2011) for inserting into the liquid outlet channel (1021) to achieve communication between the two, and the plug-in portion (2011) is externally sleeved with a sealing member (10) for forming a seal between the outer wall of the plug-in portion (2011) and the inner wall of the liquid outlet channel (1021).

7. The mucosal incision knife according to claim 1, characterized in that: The first elastic member (203) is a variable diameter spring, and its fixed end (2031) is a small diameter end, and the suspended end (2032) is a large diameter end, and the rear end of the sleeve (103) is a conical surface (1032) with a larger front and a smaller rear that cooperates with the variable diameter spring.

8. The mucosal incision knife according to claim 1, characterized in that: A plurality of guide columns (1033) are axially extended from the front end of the sleeve (103), and a plurality of guide grooves (1011) for the guide columns (1033) to be inserted are formed on the inner wall of the knife seat (101).

9. The mucosal incision knife according to claim 1, characterized in that: A boss (1022) protrudes from the outer wall of the cutter head (102), and the second elastic member is located between the outer scraper ring (401) and the boss (1022).

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