Extremely-miniature surgical operation instrument

Abstract

An extremely-miniature surgical operation instrument belongs to the field of medical instruments and comprises an outer rod component, a forceps head component and an outer tube inner pull rod, the outer rod component and the forceps head component can be detached from each other, and the outer tube inner pull rod is mounted in the outer rod component in a penetrating manner. The forceps head is driven to be opened or closed under the mechanical movement of the forceps seat inner pull rod, the outer rod assembly and the forceps seat are detachably installed, the outer inner pull rod and the forceps seat inner pull rod are detachably installed, the outer rod assembly comprises a first outer pipe and a reinforcing pipe embedded in the first outer pipe, and the reinforcing pipe is connected with the first outer pipe. The rigidity and the toughness of the micro-rod instrument are considered through the combination of the reinforcing tube and the outer tube.

Description

Technical Field

[0001] The present invention belongs to the field of medical instruments, and in particular relates to an extremely micro surgical operating instrument with a rod size of less than or equal to 3 mm. Background Art

[0002] In traditional multi-port laparoscopic minimally invasive surgery, multiple puncture holes are inserted into the body surface, followed by the installation of multiple trocars. Different instruments and endoscopes are then introduced through different trocars to complete the procedure. Single-port laparoscopic surgery, for example, involves accessing the navel. The chopstick effect and instrument clashes in single-port laparoscopic surgery increase the learning curve. Consequently, a "single-port plus one" approach has been proposed. In addition to the main navel incision for accessing the relevant instruments, an additional trocar incision is added. This additional trocar passage allows for the insertion of instruments to facilitate specialized intraoperative maneuvers, thereby improving surgical efficiency. Another prior art approach proposes an even more minimally invasive solution. In addition to the existing single-port navel incision, an instrument rod no longer than 2 mm is designed to directly penetrate the body. The rod is then attached to a 5 mm forceps head for subsequent surgical procedures. This 2 mm rod creates a smaller incision, leaving no scars. However, the current 2mm instruments have an outer tube of millimeter size, and an inner pull rod needs to be inserted inside, which is generally preset to at least 1mm. Therefore, the wall thickness of the 2mm outer tube is in the range of 0.4~0.5mm. The existing technical solutions usually use stainless steel materials, such as 304, 316, etc., which are commonly used materials for medical devices in the medical field. The hardness of the material is 70-90HRB, so the bending resistance is relatively low. When the instrument is used to perform angled lifting and moving related tissues during surgery, the instrument rod cannot support normal use requirements due to insufficient bending resistance. However, if thin-walled capillaries pursue hardness, such as heat treatment hardening, another dimension of risk will occur, namely brittle fracture. At present, there is no mature solution for such tiny instruments of about 2mm that need to take into account both rigidity and toughness. Therefore, the 3mm instrument is currently the instrument that has been put into clinical use on the market, but there is still a risk of damage.

[0003] In addition, the outer thread and the inner thread of the working jaw of the existing technical solution are connected with the outer thread and the inner thread of the rod assembly part through thread connection. According to the thread design, the standard pitch of M2 thread is 0.4 mm (coarse teeth) or 0.25 mm (fine teeth), and the standard pitch of M1 thread is 0.25 mm (coarse teeth) or 0.2 mm (fine teeth). Taking an outer tube with an outer diameter of 2 mm and a wall thickness of 0.4-0.5 mm as an example, since the wall thickness is thin, the fine teeth inner thread with a pitch of 0.25 mm is usually adopted. The internal drive rod inside the outer tube for driving the working movement of the jaw has a diameter of 1 mm, and the M1 thread usually adopts the standard coarse teeth outer thread with a pitch of 0.25 mm, and the usual practice is to adopt the same direction thread, so the same direction thread with the same pitch is adopted. However, there is a problem in this solution, that is, when the volume or weight of the tissue clamped by the jaw of the instrument is large, the resistance of the tissue to the rotation of the head of the instrument is blocked, at this time, if the handle end drive rotates the rod of the instrument, it is just the direction of rotating the rod and the jaw to loosen the thread, which will cause the head of the instrument and the rod to loosen or even fall off during the operation, resulting in functional failure and the need for reassembly.

[0004] Therefore, there is an urgent need for a better solution to solve the above two problems, one of which is to solve the problem of the balance between rigidity and toughness, and the other is to solve the problem of the loosening of the instrument head during the rotation of the instrument rod. SUMMARY

[0005] To solve the above problems, the present application discloses an extremely small surgical operating instrument, which is designed in a split type by connecting the jaw and the rod. The size of the jaw is large, which meets the use requirements; the size of the rod is small, the puncture hole is small, the trauma is small, and the recovery after operation is fast. At the same time, an improved extremely small surgical instrument is proposed to realize the effect of balancing rigidity and toughness.

[0006] The specific technical solution is as follows: an extremely small surgical operating instrument, which comprises an outer rod assembly and a jaw assembly capable of being disassembled, and an outer tube inner pull rod installed inside the outer rod assembly, the jaw assembly comprises a jaw seat, a jaw seat inner pull rod and a jaw, the jaw is driven to open or close under the mechanical movement of the jaw seat inner pull rod, the outer rod assembly and the jaw seat are detachably installed, the outer tube inner pull rod and the jaw seat inner pull rod are detachably installed, the outer rod assembly comprises a first outer tube and a reinforcing tube nested inside the first outer tube, the two ends of the first outer tube are respectively connected to install a second outer tube and a third outer tube, the second outer tube and the third outer tube limit the reinforcing tube inside the first outer tube, axially limit the reinforcing tube to ensure that it cannot be pulled out or rotated from the first outer tube, and the hardness of the reinforcing tube is greater than that of the first outer tube. The outer tube inner pull rod is a transmission rod penetrating the outer rod assembly; the jaw seat inner pull rod is an internal pull rod for driving the opening and closing of the jaw.

[0007] Further, the first outer tube has a hardness of 70-90 HRB, and the reinforcing tube has a hardness of 40-75 HRC.

[0008] Further, the first outer tube can be made of 304 stainless steel or 316L stainless steel, and the reinforcing tube can be made of titanium alloy.

[0009] Further, the second outer tube is detachably connected to the pliers base.

[0010] Further, the second outer tube comprises outer tube threads, the pliers base comprises pliers base threads, the second outer tube is detachably connected to the pliers base through the threaded structure between the outer tube threads and the pliers base threads, the outer tube inner pull rod distal end comprises outer tube inner pull rod threads, the pliers base inner pull rod comprises pliers base inner pull rod threads, and the outer tube inner pull rod is detachably installed to the pliers base inner pull rod through the threaded structure between the outer tube inner pull rod threads and the pliers base inner pull rod threads.

[0011] Further, the outer tube threads and the pliers base inner pull rod threads satisfy any of the following conditions: a) the thread directions are opposite, for example, the outer tube threads are left-handed, and the pliers base inner pull rod threads are right-handed; b) the thread directions are the same but the pitches are different, for example, the outer tube thread pitch is M2x0.4, and the inner pull rod thread pitch is M1x0.3.

[0012] Further, the first outer tube is fixedly connected to the second outer tube and the third outer tube at both ends respectively, which can be welding, bonding or pin shaft connection, or detachable connection such as threaded connection.

[0013] Further, the first outer tube has a diameter of ≤3 mm.

[0014] Further, the third outer tube comprises a compression block in the axial direction, the outer tube inner pull rod proximal end comprises an inner pull rod limiting surface, and when the compression block is close to and abuts against the inner pull rod limiting surface, the outer tube inner pull rod is axially non-rotatable relative to the third outer tube and the first outer tube.

[0015] Further, the area of the outer tube inner pull rod extending beyond the third outer tube comprises a rotating boss, and the diameter of the rotating boss is greater than the diameter of the outer tube inner pull rod extending into the internal part of the outer rod assembly.

[0016] An extremely microsurgical operating instrument assembly, comprising the aforementioned extremely microsurgical operating instrument, and a handle assembly, the handle assembly comprising a handle fixed side and a handle movable side, the third outer tube proximal end comprising an outer tube clamping groove, the handle fixed side comprising an elastically stretchable buckle, after the buckle is clamped into the outer tube clamping groove, the outer rod assembly and the handle fixed side are fixedly connected, the outer tube inner pull rod proximal end comprising a traction limiting position, the handle movable side comprising a handle clamping groove, after the traction limiting position is clamped into the handle clamping groove, the outer tube inner pull rod and the handle movable side are fixedly connected.

[0017] An extremely microsurgical operating instrument package, comprising the aforementioned extremely microsurgical operating instrument, and a sleeve, the sleeve inner hole is in close sliding fit with the first outer tube, the sleeve is a thin-walled capillary tube, the wall thickness is less than or equal to 0.5 millimeters, the sleeve proximal end comprises a guide hole and a limiting large end, and the distal end comprises a puncture sharp end.

[0018] By the above scheme, the beneficial effects that can be achieved include: by introducing the combination scheme of inner and outer double-layer materials with different hardness, the outer material is relatively soft, which ensures the toughness of the outer material, and the inner material is harder and is contained and restrained in the outer tough material, so that the overall rigidity of the rod part can be improved, and the bending and fracture of the inner hard material reinforcing pipe can be prevented, and even the fracture can be prevented from falling into the body, and the overall protection effect is fully achieved. The scheme is applied to the field of micro medical instruments with an outer diameter of less than 3 millimeters, and can better play the beneficial value effect.

[0019] In addition, the threaded connection of the instrument rod and the forceps head adopts the design that the thread direction of the inner connecting thread and the thread direction of the outer connecting thread are in opposite directions, so that even if the rotation of the handle end rotating wheel is used to realize the rotation operation of the instrument head during the operation, due to the design of the inner and outer threads in opposite directions, there is always a resistance force between the inner and outer threads to prevent the rotation of the other, thereby avoiding the risk that the instrument rod and the head are unscrewed and fall off when the instrument rod is rotated. Further, if the inner and outer threads are in the same direction, but the pitches of the inner and outer threads are different, when the outer rod is rotated, the threads with different pitches can also be mutually restrained and prevented from rotating, unless the inner and outer layers are independently rotated, the threads can be unscrewed. However, since the compression block and the inner pull rod limiting surface are designed, when the compression block and the inner pull rod limiting surface are tightly attached, the inner and outer layers cannot be independently rotated, therefore, in combination with the scheme, the safety and reliability of the instrument are improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 Assembled view of the extremely microsurgical operating instrument rod part of the present application; Figure 2Exploded view of the outer tube assembly of the microsurgical instrument of the present application; Figure 3 Partial view of the outer tube assembly of the microsurgical instrument of the present application; Figure 4 Overall central view of the outer tube assembly of the microsurgical instrument of the present application; Figure 5 Partial view A of the outer tube assembly of the microsurgical instrument of the present application; Figure 6 Partial view B of the outer tube assembly of the microsurgical instrument of the present application; Figure 7 Partial view C of the outer tube assembly of the microsurgical instrument of the present application; Figure 8 Schematic view of the microsurgical instrument of the present application with handle attached; Figure 9 Partial view of the handle assembly of the microsurgical instrument of the present application with handle attached; Figure 10 Schematic view of a kit containing the microsurgical instrument of the present application; Figure 11 Central view of the sleeve of the kit of the present application; Figure 12 Schematic view of the clinical use of the kit of the present application; In the illustration: 1-outer tube assembly; 2-inner pull rod of outer tube; 3- forceps head assembly; 4-handle assembly; 5-sleeve; 11-first outer tube; 12-second outer tube; 13-third outer tube; 14-shoulder of outer tube; 15-locking cap; 16-reinforcing tube; 17-pressing block; 21-first inner pull rod; 22-second inner pull rod; 31-forceps seat; 32-second forceps seat; 33-inner pull rod of forceps seat; 34-axle of forceps head; 35-first forceps blade; 36-second forceps blade; 37-nut of inner pull rod of forceps seat; 41-fixed side of handle; 42-movable side of handle; 43-axle of handle; 44-rotating wheel; 51-large end of limiting; 52-guiding hole; 53-piercing tip; 54-inner hole; 121-thread of outer tube; 122-outer end surface; 131-inner end surface; 141-first limiting surface; 151-second limiting surface; 152-thread of locking cap; 211-thread of inner pull rod of outer tube; 212-tip of pull rod; 221-limiting surface of inner pull rod; 222-limiting surface of traction; 223-rotating boss; 311-thread of forceps seat; 371-thread of nut; 421-slot of handle; 441-thread of rotating wheel. DETAILED DESCRIPTION

[0021] The present application will be described in detail below with reference to the drawings.

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] like Figure 1 、 2 As shown, a rod component of an ultra-micro surgical instrument includes an outer rod component 1 and a forceps component 3 that can be detached from each other, and an outer tube inner pull rod 2 installed inside the outer rod component 1. The outer rod component 1 includes a second outer tube 12, a first outer tube 11, and a third outer tube 13 connected in sequence. The second outer tube 12 includes an outer tube thread 121. The proximal end of the third outer tube 13 includes a raised outer tube shoulder 14, which is located between the forceps component 3 and the second outer tube 12. It includes a locking cap 15 that is sleeved on the outside of the third outer tube 13 and can slide axially along the outer wall of the third outer tube 13. For further reference Figure 2 As shown, the outer tube inner pull rod 2 includes a first inner pull rod 21 and a second inner pull rod 22. The distal end of the outer tube inner pull rod 2, i.e., the distal end of the first inner pull rod 21, includes an outer tube inner pull rod thread 211, and the distal end includes a pull rod tip 212 that can pierce the skin tissue. The pull rod tip 212 has a sharp end and can directly pierce the chest and abdominal wall. The proximal end of the outer tube inner pull rod 2, i.e., the proximal end of the second inner pull rod 22, includes an inner pull rod limit surface 221 and a traction limit 222. The outer tube inner pull rod 2 has a rotating boss 223. The diameter of the rotating boss 223 is larger than the diameter of the inner part of the outer tube inner pull rod 2 extending into the outer rod assembly 1, i.e., larger than the diameter of the second inner pull rod 2. The surface of the rotating boss 223 includes a knurled thread, which is convenient for pinching and rotating the outer tube inner pull rod 2 by hand, thereby saving effort.

[0024] like Figure 3The center line section view of the outer rod assembly is shown, and the first outer tube 11, the second outer tube 12, the third outer tube 13 area is enlarged. Referring to the drawings, the first outer tube 11 is connected with the second outer tube 12 at the distal end and connected with the third outer tube 13 at the proximal end. The reinforcing tube 16 is installed in the first outer tube 11. The outer end surface 122 of the second outer tube 12 and the inner end surface 131 of the third outer tube 13 limit the reinforcing tube 16 inside the first outer tube 11, axially limit the reinforcing tube, and ensure that it cannot be pulled out or rotated from the first outer tube. In a more preferred embodiment, the outer wall of the reinforcing tube 16 and the inner wall of the first outer tube 11 are in a small gap fit, that is, they are in contact but do not affect the mutual axial sliding. The hardness of the first outer tube 11 is less than the hardness of the reinforcing tube 16. The hardness of the first outer tube 11 is 70-90 HRB, and the hardness of the reinforcing tube 16 is 40-75 HRC. The material of the first outer tube 11 is stainless steel 304 or 316L, and the material of the reinforcing tube 16 is hard alloy including titanium alloy. The connection mode of the two ends of the first outer tube 11 with the second outer tube 12 and the third outer tube 13 is fixed connection including welding or bonding or pin shaft connection, or detachable connection including threaded connection. The second outer tube 12 includes an outer tube thread 121. Further, the diameter of the first outer tube 11 is ≤3mm.

[0025] By the above-mentioned combination scheme of introducing different hardness materials inside and outside, the outer material is relatively soft material, which ensures the toughness of the outer material, and the inner material is harder material and is contained and restrained in the outer tough material. This can not only improve the overall rigidity of the rod part, but also prevent the reinforcing tube of the inner hard material from bending and breaking, even breaking and falling into the body, fully playing the overall protection effect. This scheme is applied to the field of medical micro-instruments with an outer diameter of less than 3mm, and can better play the beneficial value effect.

[0026] Figure 4 、 5 , 6, 7 show the section view and local enlarged view of the assembly of the pliers head assembly. Further, as shown in Figure 5As shown, the jaw assembly 3 includes a jaw seat 31, a second jaw seat 32, a jaw seat inner pull rod 33, and a jaw pin shaft 34, around which a jaw head is installed, which can rotate around the jaw pin shaft 34, including a first jaw piece 35 and a second jaw piece 36, which are driven to rotate around the jaw pin shaft 34 under the mechanical movement of the jaw seat inner pull rod 33 itself, so as to realize the opening or closing of the jaw head. The end of the jaw seat inner pull rod 33 is butt-jointed with a jaw seat inner pull rod nut 37 having an inner hole, which includes a nut inner thread 371. The jaw seat 31 includes a jaw seat inner thread 311. The outer tube thread 121 of the second outer tube 12 is connected with the jaw seat inner thread 311, and the outer tube inner pull rod thread 211 of the first inner pull rod 21 is connected with the nut inner thread 371 of the jaw seat inner pull rod nut 37, so as to realize the detachable installation of the outer rod assembly 1 and the jaw seat 31, and the detachable installation of the outer tube inner pull rod 2 and the jaw seat inner pull rod 33.

[0027] Figure 6 Further details of the cooperation between the first outer tube 11 and the third outer tube 13, and a schematic view of the first inner pull rod 21 penetrating through the third outer tube 13 and the first outer tube 11 are shown.

[0028] As Figure 7 shown, the outer tube shaft shoulder 14 includes a first limiting surface 141, the locking cap 15 includes a second limiting surface 151 and a locking cap inner thread 152, and the locking cap 15 (sleeved on the outer side of the proximal end of the third outer tube 13 and abutting against the outer tube shaft shoulder 14) is axially fixed through the second limiting surface 151. The second inner pull rod 22 includes a traction limiting surface 222, a rotating boss 223, and an inner pull rod limiting surface 221 from proximal end to distal end in sequence, and the third outer tube 13 includes a pressing block 17, which is fixedly connected to the third outer tube 13. Under the action of external force in the direction of the shaft center, the pressing block 17 abuts against the inner pull rod limiting surface 221, preventing the second inner pull rod 22 from rotating along the axis relative to the third outer tube 13, so as to realize the synchronous rotation of the outer rod assembly 1 and the outer tube inner pull rod 2, and the rotation pair of the two is limited.

[0029] On this basis, the outer tube thread 121 of the second outer tube 12 and the outer tube inner pull rod thread 211 of the first inner pull rod 21 are opposite in thread direction, such as the left-handed thread of the outer tube thread and the right-handed thread of the inner pull rod thread, so that even if rotation of the instrument head is achieved by rotating the handle end during the operation, due to the design of the opposite threads of the inner and outer layers, there is always a resistance force between the inner and outer layers to prevent rotation of the other, thereby avoiding the risk of loosening the threads between the instrument rod and the head and falling off by rotating the instrument rod.

[0030] Further, if the outer tube thread 121 of the second outer tube 12 and the outer tube inner pull rod thread 211 of the first inner pull rod 21 are the same in thread direction, but the inner and outer threads have different pitches, such as the M2x0.4 pitch of the outer tube thread and the M1x0.3 pitch of the inner pull rod thread. When rotating the outer rod, the threads with different pitches can also be mutually restrained and prevented from rotating, unless the inner and outer layers are independently rotated, the threads can be tightened. Therefore, this scheme improves the safety and reliability of the instrument.

[0031] As shown in Figure 8 , 9 , a very small surgical operating instrument, comprising the foregoing very small surgical operating instrument, and a handle assembly 4, the handle assembly 4 comprising a handle fixed side 41 and a handle movable side 42, a handle rotating shaft 43 and a rotating wheel 44, the handle movable side 42 can rotate along the handle rotating shaft 43, the outer tube inner pull rod 2 proximal end comprises a traction limit 222, the handle movable side 42 comprises a handle clamping groove 421, after the traction limit 222 is clamped into the handle clamping groove 421, the outer tube inner pull rod 2 and the handle movable side 42 are fixedly connected. The rotating wheel 44 comprises a rotating wheel outer thread 441, the locking cap 15 is in contact with the rotating wheel 44, and the handle assembly is fixedly connected with the third outer tube 13 by the thread cooperation between the locking cap inner thread 152 and the rotating wheel outer thread 441 of the rotating wheel 44. Rotating the handle movable side 42 can pull the outer tube inner pull rod 2 to move in the axial direction, thereby driving the forceps head to open and close.

[0032] As shown in Figure 10 , 11 , a very small surgical operating instrument package, comprising a very small surgical operating instrument as described above, and a sleeve 5, the inner hole 54 of the sleeve 5 is in close sliding fit with the first outer tube 11, the sleeve 5 is a thin-walled capillary tube with a wall thickness ≤0.5mm, the proximal end of the sleeve 5 comprises a guide hole 52 and a limit large end 51, and the distal end comprises a puncture sharp end 53, Figure 10 The dashed line is the packaging sealing line.

[0033] AsFigure 12 As shown, after the sleeve 5 is introduced, the sleeve 5 can be preferentially punctured into the abdominal wall, and then the first outer tube 11 is introduced into the sleeve 5 and slides in the axial direction of the sleeve 5. Because the skin tissue of the human body has a certain wrapping elastic force and adhesion, if the first outer tube 11 directly enters or exits along the abdominal wall during the operation, it will be more rough, affecting the continuity of the operation and increasing the resistance. Therefore, after the sleeve 5 is introduced, the operation is more smooth. However, the wall thickness of the sleeve is limited, that is, the outer diameter of the sleeve 5 is limited to the maximum extent, reducing the trauma to the abdominal wall.

[0034] In the drawings of the embodiments of the present application, the same or similar reference numerals correspond to the same or similar components, and in the description of the present application, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms used to describe the positional relationship in the drawings are only used for exemplary illustration and cannot be understood as a limitation of the present application. For those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0035] It should be noted that when an assembly is referred to as being "connected" to another assembly, it can be directly connected to the other assembly or there can be a middle assembly; when an assembly is referred to as being "fixed" to another assembly, it can be directly fixed to the other assembly or there can be a middle assembly, which can be fixed by effective means such as adhesion, welding, riveting, bolts, etc., which are not enumerated one by one in the present application; when an assembly is referred to as being "movable" to another assembly, it can be through rotation or sliding.

[0036] The present application is not limited to the foregoing specific embodiments. The present application extends to any new feature or any new combination disclosed in the present specification, as well as any new method or process steps disclosed or any new combination.

Claims

1. An ultra-micro surgical instrument, characterized in that: It includes an outer rod assembly and a clamp head assembly that can be disassembled from each other, and an outer tube inner pull rod installed inside the outer rod assembly. The clamp head assembly includes a clamp seat, a clamp seat inner pull rod and a clamp head. The clamp head is driven to open or close under the mechanical movement of the clamp seat inner pull rod itself. The outer rod assembly and the clamp seat are detachable, and the outer tube inner pull rod and the clamp seat inner pull rod are detachable. The outer rod assembly includes a first outer tube and a reinforcement tube nested inside the first outer tube. The two ends of the first outer tube are respectively connected to the second outer tube and the third outer tube. The second outer tube and the third outer tube confine the reinforcement tube inside the first outer tube and limit the reinforcement tube axially to ensure that it cannot be pulled out or rotated from the first outer tube. The hardness of the reinforcement tube is greater than that of the first outer tube.

2. The micro surgical instrument according to claim 1, characterized in that: The hardness of the material of the first outer tube is 70-90 HRB, and the hardness of the material of the reinforcing tube is 40-75 HRC.

3. The micro surgical instrument according to claim 1, characterized in that: The second outer tube is detachably connected to the clamp seat.

4. The micro surgical instrument according to claim 3, characterized in that: The second outer tube is detachably connected to the clamp seat, the second outer tube includes an outer tube thread, the clamp seat includes a clamp seat thread, the second outer tube and the clamp seat are detachably connected through a threaded structure between the outer tube thread and the clamp seat thread, the distal end of the outer tube inner pull rod includes an outer tube inner pull rod thread, the clamp seat inner pull rod includes a clamp seat inner pull rod thread, the outer tube inner pull rod and the clamp seat inner pull rod are detachably installed through a threaded structure between the outer tube inner pull rod thread and the clamp seat inner pull rod thread.

5. The micro surgical instrument according to claim 4, characterized in that: The external pipe thread and the internal tie rod thread of the clamp seat meet any of the following conditions: a) the thread directions are opposite; b) the thread directions are the same but the pitches are unequal.

6. The micro surgical instrument according to claim 1, characterized in that: The two ends of the first outer tube are respectively fixedly connected to the second outer tube and the third outer tube by welding, bonding or pin connection, or the detachable connection includes threaded connection.

7. The micro surgical instrument according to claim 1, characterized in that: The diameter of the first outer tube is ≤3 mm.

8. The micro surgical instrument according to claim 1, characterized in that: The third outer tube includes a clamping block in the axial direction, and the proximal end of the inner pull rod of the outer tube includes an inner pull rod limiting surface. When the clamping block approaches and presses against the inner pull rod limiting surface, the inner pull rod of the outer tube does not rotate axially relative to the third outer tube and the first outer tube.

9. An ultra-micro surgical instrument assembly, characterized in that: It comprises an extremely micro surgical operating instrument as described in any one of claims 1 to 8, and a handle assembly, wherein the handle assembly comprises a fixed handle side and a movable handle side, the proximal end of the third outer tube comprises an outer tube slot, the fixed handle side comprises an elastically retractable buckle, after the buckle is snapped into the outer tube slot, the outer rod assembly and the fixed handle side are fixedly connected, the proximal end of the outer tube inner pull rod comprises a traction limiter, the movable handle side comprises a handle slot, after the traction limiter is snapped into the handle slot, the outer tube inner pull rod and the movable handle side are fixedly connected.

10. An ultra-micro surgical instrument kit, characterized by: It comprises an ultra-micro surgical instrument assembly as claimed in claim 9, and a sleeve, wherein the inner hole of the sleeve is tightly slidably matched with the first outer tube, and the sleeve is a thin-walled capillary with a wall thickness of ≤0.5 mm.

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