Endoscope surgery knife capable of achieving stable cutting and blade retraction by using secondary pushing

Abstract

The application discloses a kind of endoscope surgical knives for realizing stable cutting and blade collection by secondary push, to solve the problems of existing endoscope surgical knives, such as inconvenient operation and low reliability, which comprises a pipe fitting, an elastic telescopic push rod, a first limiting component and a second limiting component.A first limiting portion is provided on the inner wall of the pipe fitting.The elastic telescopic push rod is movably arranged in the pipe fitting, with a second limiting portion provided at one axial end and a blade provided at the end of the end portion, the other end is elastically connected with the pipe fitting, and the end is provided with an unlocking portion.The first limiting component is elastically movably connected with the pipe fitting, and has a locking end.The second limiting component is elastically movably connected with the pipe fitting, and has a driving portion and a matching portion.The driving portion is acted on by the unlocking portion, and the matching portion is matched with the first limiting component.The application is convenient to operate, and the state of the surgical knife can be guaranteed stable during operation, with high reliability.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to a laparoscopic surgical knife that utilizes a secondary push to achieve stable cutting and blade retraction. Background Technology

[0002] Technological advancements have made it possible to perform surgery through smaller incisions. This results in less tissue damage than traditional surgery. Through a keyhole-sized incision, surgeons can insert tiny light sources, cameras, and surgical instruments. Guided by images transmitted to a monitor, the surgeon manipulates the instruments to perform the procedure. When this type of surgery is performed in the abdominal cavity, it is called laparoscopic surgery; when performed in a joint, it is called arthroscopic surgery; and when performed in the thoracic cavity, it is called thoracoscopic surgery.

[0003] During laparoscopic surgery, the stability of the scalpel must be ensured during insertion and withdrawal to prevent the sharp blade from accidentally injuring surrounding healthy tissue. Therefore, traditional scalpels are specifically designed for laparoscopic surgery, with the blade concealed within a protective tube. The blade extends from the tube only when it reaches the surgical site, thus preventing contact with surrounding tissue. However, existing laparoscopic scalpels are either inconvenient or difficult to operate with one hand, making it difficult to maintain the stability of the protective tube, or rely on electricity for convenience but with questionable reliability. Summary of the Invention

[0004] This invention provides a laparoscopic scalpel that achieves stable cutting and blade retraction through a two-stage push. It mainly relies on a mechanical structure and utilizes an axial push operation mode to simultaneously extend and retract the blade. While ensuring convenient one-handed operation, it also ensures the stability of the tube during operation and has high reliability.

[0005] This invention is achieved through the following technical solution:

[0006] A laparoscopic surgical scalpel that utilizes a secondary push to achieve stable cutting and blade retraction includes:

[0007] The pipe fitting has a first limiting part inside;

[0008] An elastic telescopic push rod is movably inserted in the pipe fitting. The elastic telescopic push rod has a first end and a second end that are telescopically connected. The first end is provided with a second limiting part for forming an axial limiting part with the first limiting part, and the end of the first end is provided with a blade. The second end is elastically connected to the pipe fitting and is provided with an unlocking part.

[0009] A first limiting assembly that is elastically and movably connected to the pipe fitting has a locking end for cooperating with the second limiting portion to maintain the state of the second limiting portion;

[0010] The second limiting component, which is elastically and movably connected to the pipe fitting, has a driving part and a mating part. The driving part is actuated by the unlocking part to move the second limiting component, and the mating part is mated with the first limiting component to maintain the state of the first limiting component.

[0011] In the working state, the first limiting component is activated and moves relative to the pipe fitting to engage with the mating part; when the elastic telescopic push rod is pushed to make the first limiting part and the second limiting part form an axial limit, the blade is located outside the pipe fitting, and the locking end engages with the second limiting part; when the elastic telescopic push rod is pushed to make itself elastically contract, the unlocking part acts on the driving part to make the mating part disengage from the first limiting component.

[0012] In some embodiments, the second end is provided with a guide platform that slides in contact with the inner wall of the pipe fitting.

[0013] In some embodiments, the guide platform is concentric with the projection of the first limiting part onto the axial direction of the pipe fitting.

[0014] In some embodiments, the blade has a gap with the inner wall of the pipe in the axial direction, the gap being not less than 2 mm.

[0015] In some embodiments, the locking end and the second limiting part are engaged by a telescopic latch.

[0016] In some embodiments, the second limiting portion has a notch on the side closest to the first limiting portion and the telescopic latch is located in the notch; when the elastic telescopic push rod passes through the pipe, the locking end can be accommodated in the notch.

[0017] In some embodiments, the unlocking part acts on the driving part through a fixed pulley mechanism disposed within the pipe fitting; wherein, one end of the cable in the fixed pulley mechanism is connected to the unlocking part, and the other end of the cable is connected to the driving part.

[0018] In some embodiments, a resilient winding assembly is further included, which is slidably connected to the tube, the resilient winding assembly cooperating with the cable body to allow the cable body to travel around the resilient winding assembly, and the slidable direction of the resilient winding assembly is not perpendicular to the axial direction of the tube body.

[0019] In some embodiments, a reset mechanism disposed within the fitting is also included, the reset mechanism being used to reset the first limiting component when the mating portion disengages from the first limiting component.

[0020] In some embodiments, the first limiting component is provided with an indicator and the indicator can move with the first limiting component to an indicating state;

[0021] The pipe fitting is provided with an indicator groove that communicates with the external space;

[0022] When the indicator is in the indicating state, the indicator is located in the indicating slot.

[0023] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. The laparoscopic scalpel provided by the embodiments of the present invention utilizes a secondary push to achieve stable cutting and blade retraction. During the process of pushing the elastic telescopic push rod, the entire elastic telescopic push rod is pushed to make the blade extend outside the tube. The blade's state is maintained by the cooperation of the second limiting part and the first limiting component, thereby realizing the surgical operation. Then, the elastic telescopic push rod itself can elastically retract to make the second end move relative to the first end. This movement is still achieved by the aforementioned push. The cooperation between the second limiting part and the first limiting component is released by the interaction of the unlocking end and the driving part, thereby allowing the blade to return to the tube. The operation is convenient, and the direction of the force used in the operation is certain, which can ensure the stability of the tube. At the same time, the extension and retraction of the blade are mainly achieved by mechanical structure, which has high reliability.

[0024] 2. The laparoscopic scalpel provided in this embodiment of the invention utilizes a secondary push to achieve stable cutting and blade retraction. The relative position of the blade and the tube remains unchanged during the retraction process, that is, the position of the blade at the surgical site does not change, which can ensure that the blade does not cause damage to other normal tissue structures during the retraction operation to the tube.

[0025] 3. The laparoscopic scalpel provided in this embodiment of the invention utilizes a secondary push to achieve stable cutting and blade retraction. When the blade extends or retracts from the tube, the force applied by the operator is along the axial direction of the tube. During the operation, the tube is not subjected to radial force. The laparoscopic scalpel that utilizes a secondary push to achieve stable cutting and blade retraction will not experience radial deviation. The blade will not create excessive cutting volume on the tissue structure in the radial direction of the tube. At the same time, it ensures that the spatial path of the blade extension and retraction remains unchanged, avoiding damage to other tissue structures by the blade. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of a laparoscopic surgical knife structure that utilizes a secondary push to achieve stable cutting and blade retraction, provided in an embodiment of the present invention.

[0028] Figure 2 for Figure 1 Enlarged structural diagram at point A;

[0029] Figure 3 This is a schematic diagram of the elastic telescopic push rod structure provided in an embodiment of the present invention;

[0030] Figure 4 for Figure 3 Enlarged structural diagram at point B;

[0031] Figure 5 for Figure 1 Enlarged structural diagram at point C;

[0032] Figure 6 This is a schematic diagram of the elastic winding assembly structure provided in an embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of the structure of the second limiting component provided in an embodiment of the present invention;

[0034] Figure 8 This is a schematic diagram of the structure of the first limiting component provided in an embodiment of the present invention;

[0035] Figure 9 This is a schematic diagram of the pipe fitting provided in an embodiment of the present invention.

[0036] The attached diagram shows the markings and corresponding component names:

[0037] 1-Pipe fitting, 11-First limiting part, 2-Elastic telescopic push rod, 21-First push rod, 22-Second push rod, 23-First guide boss, 24-Second guide boss, 25-Snap-fit ​​post, 26-Push rod telescopic groove, 27-First spring, 28-Unlocking part, 29-Second limiting part, 291-Notch, 292-Telescopic clip, 293-Second spring, 3-Second limiting assembly, 31-Drive part, 32-Matching part, 33-Third spring, 4-First limiting assembly, 41-Locking end, 42-Fourth spring, 43-Card slot, 5-Blade, 6-Attraction part, 7-Electromagnet, 8-Elastic winding assembly, 81-Moving wheel, 82-Sliding shaft, 83-Coil spring, 84-Cable body fixing post, 9-Cable body. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0039] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that these specific details are not necessary to practice the invention. In other embodiments, well-known structures, circuits, materials, or methods have not been specifically described in order to avoid obscuring the invention.

[0040] Throughout this specification, references to "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with that embodiment or example is included in at least one embodiment of the invention. Therefore, the phrases "an embodiment," "an example," "an example," or "an example" appearing in various places throughout the specification do not necessarily refer to the same embodiment or example. Furthermore, specific features, structures, or characteristics can be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. Moreover, those skilled in the art will understand that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0041] In the description of this invention, the terms "front," "rear," "left," "right," "up," "down," "vertical," "horizontal," "high," "low," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0042] In current laparoscopic surgery, the fixed scalpels we previously used were prone to accidentally injuring normal tissue with the blade when inserting or retracting the scalpel. To address this issue, we previously utilized a matching structure that could assist in retracting the scalpel, integrating the auxiliary mechanism into one side of the scalpel. However, due to the involvement of precision instrument operation, while it effectively facilitated rapid scalpel retraction and prevented tissue contraction that could lead to an enlarged wound, it significantly reduced the overall ease of use and added additional difficulty to the surgical procedure. For example, some procedures required two-handed operation; in others, the direction of force was not aligned with the axis of the tube, making it difficult to apply force, and even slight carelessness could cause the scalpel to deviate. Furthermore, we have also adopted a method that uses a drive mechanism to move the pusher into or out of the surgical site. However, in case of emergencies, whether the blade should move forward or backward requires judgment by a professional based on experience. For example, when the blade just extends out of the cannula, some tissue structures may temporarily obstruct the blade's entry due to elastic expansion and contraction. If the pusher is moved automatically, the inertial torque generated by the transmission mechanism itself and the backlash in the transmission structure make it difficult to stop the blade at the predetermined position in time, which may cause accidental injury to some tissue structures. To address the problems encountered in actual operation, manual operation of the pusher is necessary to ensure that no errors occur during the operation. That is, the professional can remove the force applied to the pusher in time based on the image, thereby stopping the blade from moving forward or backward in time. In this regard, this application proposes a laparoscopic scalpel that uses a secondary push to achieve stable cutting and blade retraction to ensure the reliability of blade control.

[0043] like Figures 1-9As shown, in one embodiment of a laparoscopic scalpel for stable cutting and blade retraction using secondary thrust provided by the present invention, the laparoscopic scalpel for stable cutting and blade retraction using secondary thrust includes a tube 1, an elastic telescopic push rod 2, a first limiting component 4, and a second limiting component 3; a first limiting part 11 is provided on the inner wall of the tube 1; the elastic telescopic push rod 2 is movably inserted into the tube 1, the elastic telescopic push rod 2 has a first end and a second end that are relatively telescopically connected, the first end is provided with a second limiting part 29 for forming an axial limit with the first limiting part 11, and the end of the first end is provided with a blade 5, the second end is elastically connected to the tube 1, and the second end is provided with an unlocking part 28; the first limiting component 4 is elastically movably connected to the tube 1, and it has a function for cooperating with the second limiting part 29 to make the first limiting part 11 axially limit the blade 21. The locking end 41 of the second limiting part 29 is held in a certain state; the second limiting component 3 is elastically and movably connected to the pipe 1, and has a driving part 31 and a mating part 32. The driving part 31 is used to be acted on by the unlocking part 28 to make the second limiting component 3 move, and the mating part 32 is used to cooperate with the first limiting component 4 to keep the first limiting component 4 in a certain state; in the working state, the first limiting component 4 is acted on and moves relative to the pipe 1 to cooperate with the mating part 32; when the elastic telescopic push rod 2 is pushed to make the first limiting part 11 and the second limiting part 29 form an axial limit, the blade 5 is located outside the pipe 1, and the locking end 41 cooperates with the second limiting part 29; when the elastic telescopic push rod 2 continues to be pushed to make itself elastically contract, the unlocking part 28 acts on the driving part 31 to make the mating part 32 disengage from the first limiting component 4.

[0044] In use, the user first pushes the first limiting component 4 to move it relative to the tube 1 until the first limiting component 4 engages with the mating part 32, at which point the state of the first limiting component 4 can be maintained. Then, the laparoscopic scalpel is inserted into the incision at the surgical site until one end of the tube 1 reaches the predetermined position. The user pushes the elastic telescopic push rod 2 to move the blade 5 so that the blade 5 extends out of the tube 1. When the second limiting part 29 abuts against the first limiting part 11, the blade 5 extends completely out of the tube 1. At the same time, the second limiting part 29 engages with the locking end 41 on the first limiting component 4 to maintain the state of the second limiting part 29. The elastic telescopic push rod 2 automatically extends due to its elastic connection with the tube 1, and the end of the elastic telescopic push rod 2 extends out of the tube. 1. External for the user to advance next; after the cutting is completed, the user pushes the elastic telescopic push rod 2 to the first pushed position, and continues to push to make the elastic telescopic push rod 2 passively retract. During the pushing process, the unlocking end on the elastic telescopic push rod 2 acts on the driving part 31 to make the second limiting component 3 move relative to the tube 1. At the same time, the cooperating part 32 disengages from the first limiting component 4. The first limiting component 4 retracts to the position before pushing under the elastic action. At this time, the locking end 41 disengages from the second limiting part 29. The entire elastic telescopic push rod 2 retracts under the elastic action to drive the blade 5 back into the tube 1. Then the entire laparoscopic scalpel can be pulled out of the incision of the surgical site. Since the blade 5 retracts into the tube 1, the blade of the blade 5 will not cause damage to the normal tissue structure.

[0045] In this embodiment, the specific shape of the pipe fitting 1 is not limited. Considering ease of operation, such as... Figure 9 As shown, the tube 1 can be a round tube with a flat outer wall, facilitating the movement of the laparoscopic scalpel, which uses secondary pushing to achieve stable cutting and retraction, through the surgical incision. A boss can be provided on the inner wall of the tube 1 as a first limiting part 11. This boss can be continuous or discontinuous. Considering that the first limiting part 11 can provide a reliable limiting effect, it can be a ring-shaped boss coaxial with the tube 1, with the center of the ring-shaped boss for the passage of the elastic telescopic push rod 2. Two sliding grooves can be provided on the tube wall of the tube 1 for the sliding of the first limiting component 4 and the second limiting component 3, such as... Figure 2 , Figure 7 and Figure 8As shown, the pipe fitting 1 has a first sliding groove on its inner wall. The first sliding groove is used to install a first limiting component 4. The first limiting component 4 may specifically include a first sliding rod and a fourth spring 42. One end of the first sliding rod is connected to the bottom of the first sliding groove through the fourth spring 42, and the other end of the first sliding rod serves as a locking end 41. A slot 43 is also provided on the arm of the first sliding rod. The first sliding groove has a second sliding groove on its wall. The second sliding groove is used to install a second limiting component 3. The second limiting component 3 may specifically include a second sliding rod and a third spring 33. One end of the second sliding rod is connected to the bottom of the second sliding groove through the third spring 33 and serves as a driving end. The other end of the second sliding rod serves as a mating part 32, and the shape of the mating part 32 is adapted to the shape of the slot 43. Under the elastic force of the third spring 33, the second sliding rod can slide in the second sliding groove so that the mating part 32 is located in the slot 43.

[0046] For the relative movable structure of the elastic telescopic rod and the tube 1, simply improving the fitting accuracy between the elastic telescopic rod and the tube 1 to ensure the movement stability of the elastic telescopic rod would lead to high manufacturing costs. This is because the diameter of this type of laparoscopic surgical knife is very small, and the simple structural processing is already quite difficult. Therefore, in some embodiments, a guide platform is provided at the second end, which slides in contact with the inner wall of the tube 1. In specific implementation, the guide platform can be a circular boss provided on the outer peripheral wall of the second end, that is, the projection of the guide platform and the first limiting part 11 on the axial direction of the tube 1 is concentric. This is equivalent to increasing the contact area between the elastic telescopic rod and the inner wall of the tube 1, which can ultimately ensure the movement stability of the elastic telescopic rod, that is, ensure that the extension and retraction direction of the blade 5 is constant.

[0047] During the surgery, the wound cut by the scalpel blade 5 is usually relatively smooth, and an adhesion phenomenon easily forms between the blade 5 and the wound. When the blade 5 is retracted, it easily pulls the tissue at the wound towards the tube 1. There must be a certain gap between the blade 5 and the wall of the tube 1. The size of the gap will determine whether the tissue can slide out after entering the tube 1. We conducted some simulation experiments on the size of the gap. The experimental results show that when the gap between the blade 5 and the inner wall of the tube 1 is too small, the tissue is easily stuck between the blade 5 and the inner wall of the tube 1, and the blade 5 cannot be retracted. If the elastic telescopic rod is forcibly pulled, the tissue stuck between the blade 5 and the inner wall of the tube 1 will deform. The deformed tissue has a higher probability of contacting the cutting edge of the blade 5. Specifically, in an average of ten pulls, the wound tissue came into contact with the cutting edge six times, and the blade 5 made a secondary cut to the tissue at this point. Therefore, in some embodiments, there is a gap between the blade 5 and the inner wall of the tube 1 in the axial direction, and the gap is not less than 2 mm. In practice, the gap is not set too large without limit. It can be set according to the size and specifications of conventional laparoscopic scalpels, as long as the gap between the blade 5 and the tube 1 is not less than 2mm.

[0048] In the embodiments of this application, such as Figure 3 As shown, the elastic telescopic push rod 2 may specifically include a first push rod 21 and a second push rod 22. The end of the first push rod 21 may have a push rod telescopic groove 26 with a diameter larger than that of the second push rod 22, coaxially formed. One end of the second push rod 22 is movably inserted into the push rod telescopic groove 26 and connected to the bottom of the groove 26 via a first spring 27. A limiting protrusion may be provided on the second push rod 22 to prevent it from slipping out of the push rod telescopic groove 26. Simultaneously, the limiting protrusion also guides the movement of the second push rod 22 relative to the first push rod 21. A locking post 25 is provided on the other end of the second push rod 22 to engage with the blade 5. A first guide protrusion 23 and a second guide protrusion 24, with diameters equal to the inner diameter of the pipe fitting 1, may also be provided on the first push rod 21 and the second push rod 22, respectively, to ensure a relatively stable direction of movement for the elastic telescopic push rod 2. The second limiting part 29 is fixedly disposed on the outer wall of the second push rod 22. In the axial direction of the pipe 1, the projection of the second limiting part 29 and the projection of the first limiting part 11 have an overlapping area. When the elastic telescopic push rod 2 slides relative to the pipe 1, the second limiting part 29 and the first limiting part 11 come into contact with each other and can form an axial limit on the elastic telescopic push rod 2. The second limiting part 29 can be a convex ring or a block. When the first limiting part 11 is an annular protrusion, the second limiting part 29 can preferably be set as a block to save material costs.

[0049] In this embodiment, the first limiting component 4 can engage with the second limiting part 29 via a snap-fit ​​mechanism to limit the axial displacement of the second push rod 22. For example, in some possible embodiments, the locking end 41 of the first limiting component 4 is an elastic telescopic end, while the second limiting part 29 is provided with a wedge-shaped guide surface. When the elastic telescopic push rod 2 passes through the pipe fitting 1, the wedge-shaped guide surface contacts the end of the locking end 41, and the locking end 41 is compressed under the action of radial force. When the locking end 41 is compressed to its limit position, the second limiting part 29 can just pass through the gap between the locking end 41 and the second push rod 22. The locking end 41 no longer bears the radial force and automatically resets. At this time, the locking end 41 can axially limit the second limiting part 29. In other embodiments, an elastic telescopic clip 292 can also be provided on the second limiting part 29, and the elastic telescopic clip 292 can engage with the first limiting component 4 to thereby axially limit the second limiting part 29. Specifically, for example... Figure 4 As shown, the second limiting part 29 has a notch 291 on its end face near the blade 5. This notch 291 is used to allow the locking end 41 on the first limiting assembly 4 to pass through. A mounting groove is provided inside the notch 291, and a telescopic clip 292 is movably inserted into the mounting groove. The telescopic clip 292 is connected to the bottom of the mounting groove via a second spring 293. A wedge-shaped guide surface can be provided on the telescopic clip 292, and this wedge-shaped guide surface faces the blade 5. When the second push rod 22 is pushed, the locking end 41 can enter the notch 291 from the edge of the notch 291. When the telescopic clip 292 contacts the locking end 41, the telescopic clip 292 is forced back into the mounting groove. After the locking end 41 disengages from the wedge-shaped guide surface, the second spring 293 applies a spring force to the telescopic clip 292 so that the telescopic clip 292 forms an axial limit on the locking end 41. At this time, the locking end 41 also forms an axial limit on the second limiting part 29. In this embodiment, the snap-fit ​​structure is set on the second limiting part 29, which is equivalent to indirectly simplifying the structure of the first limiting component 4, thereby reducing the space occupied by the first limiting component 4 on the pipe wall of the pipe fitting 1, and thus reducing the thickness requirement of the pipe fitting 1.

[0050] In this embodiment, when the second limiting part 29 and the first limiting part 11 form a limiting position, the locking end 41 needs to be engaged with the second limiting part 29 to limit the axial displacement of the second push rod 22. This will place high demands on the manufacturing precision of the limiting structure between the second limiting part 29 and the locking end 41. Therefore, in some possible embodiments, an elastic layer is provided on the side of the first limiting part 11 that forms an axial limiting position with the second limiting part 29.

[0051] In this embodiment, the elastic layer allows the second push rod 22 to have a small movable displacement after the second limiting part 29 contacts the first limiting part 11, so as to ensure that the locking end 41 and the second limiting part 29 can be stably connected; such a design structure also improves the operation tolerance of the scalpel.

[0052] In this embodiment, the unlocking part 28 can act on the driving part 31 through a linkage mechanism. For example, a swing arm is rotatably installed in the pipe wall of the pipe fitting 1. One end of the swing arm is hinged to the driving part 31, and the other end of the swing arm extends out of the pipe wall and is located in the inner hole of the pipe fitting 1. This end can form an axial limit with the unlocking part 28 in the axial direction of the pipe fitting 1. When the first push rod 21 is pushed, the unlocking part 28 can contact the swing arm. The swing arm rotates under the force of the unlocking part 28, and the end of the swing arm connected to the driving part 31 will drive the second limiting component 3 to slide, thereby causing the mating part 32 to disengage from the first limiting component 4. Of course, this requires certain requirements on the pipe wall thickness of the pipe fitting 1 to meet the space occupation of the swing arm itself and the space occupation during the swing arm's movement. Furthermore, the unlocking part 28 and the driving part 31 can also interact through a non-linkage structure. For example, in some possible embodiments, the unlocking part 28 acts on the driving part 31 through a fixed pulley mechanism provided in the tube 1; wherein, one end of the cable 9 in the fixed pulley mechanism is connected to the unlocking part 28, and the other end of the cable 9 is connected to the driving part 31.

[0053] In this embodiment, the thickness of the tube 1 only needs to meet the requirements for the installation of the fixed pulley, while the space occupied by the cable 9 is minimal, and the state of the cable 9 itself is variable, so there is no need to reserve a certain amount of space for the cable 9 to move. This reduces the design thickness of the tube wall of the tube 1, thereby making the overall size of the laparoscopic scalpel smaller. Of course, before pushing the elastic telescopic push rod 2, the cable 9 is in a non-tensioned state. When the second limiting part 29 just contacts the first limiting part 11, the cable 9 is just in a tensioned state.

[0054] It should be noted that fitting 1 can be divided into two parts. When the two parts overlap, they form the mounting cavity for the cable body 9, drive unit 31, etc. Understandably, the two parts of fitting 1 may be completely identical or different, and the design can be adapted according to the shape of the mounting cavity.

[0055] When the cable 9 is not under stress, its shape and orientation are uncontrollable. When it is tensioned, it may become knotted, which would shorten the actual effective length of the cable 9. Therefore, in some possible embodiments, to ensure that the cable 9 is always under tension and to prevent knotting, such as... Figure 5As shown, the laparoscopic scalpel that achieves stable cutting and blade retraction through secondary pushing can also include an elastic winding assembly 8 that is slidably connected to the tube 1. The elastic winding assembly 8 cooperates with the cable 9 so that the cable 9 can wrap around the elastic winding assembly 8 and the sliding direction of the elastic winding assembly 8 is not perpendicular to the axis of the tube 1.

[0056] In the embodiments of this application, such as Figure 6 As shown, the elastic winding assembly 8 may specifically include a hollow movable wheel 81 and a sliding shaft 82 coaxially disposed inside the movable wheel 81. The sliding shaft 82 is connected to the inner side of the movable wheel 81 by a coil spring 83, and one end of the sliding shaft 82 is slidably connected to the wall of the tube 1. The movable wheel 81 may have an annular groove on its circumferential side to accommodate the wound cable 9. The groove wall of the annular groove is provided with a cable fixing post 84 for fixing the cable 9.

[0057] In some possible embodiments, the laparoscopic scalpel that utilizes secondary thrust to achieve stable cutting and blade retraction may further include a reset mechanism disposed within the tube 1. This reset mechanism is used to reset the first limiting component 4 when the mating part 32 disengages from the first limiting component 4. Specifically, the reset mechanism can be driven by an electromagnet 7, and the first limiting component 4 is provided with an attraction part 6 attracted by the powered magnet 7. When the attraction part 6 is attracted by the electromagnet 7, the first limiting component 4 moves relative to the tube 1 to engage with the mating part 32.

[0058] In this embodiment, after the electromagnet 7 is provided, the attraction force of the electromagnet 7 on the attraction part 6 can drive the first limiting component 4 to move, thereby realizing the first limiting component 4 and the mating part 32 to form a mating. The structure is simple and the operation is convenient.

[0059] In some possible embodiments, the first limiting component 4 is provided with an indicator and the indicator can move with the first limiting component 4 to the indicating state; the pipe 1 is provided with an indicator groove communicating with the external space; when the indicator is in the indicating state, the indicator is located in the indicator groove.

[0060] In this embodiment, the indicator makes it easier for the user to observe the state of the first limiting component 4, thereby improving the ease of use of the laparoscopic scalpel that achieves stable cutting and blade retraction through secondary pushing.

[0061] The laparoscopic scalpel provided in this application embodiment utilizes a secondary push to achieve stable cutting and blade retraction. During the process of extending or retracting the blade 5 into the tube 1, the user only needs to apply an axial force to the elastic telescopic push rod 2. This can prevent radial deviation of the tube 1 and blade 5 during operation, thereby avoiding accidental damage to other tissue structures by the blade 5, and at the same time, preventing damage to the surgical site incision by the tube 1.

[0062] It should be noted that in the above-mentioned structure and components, the stiffness coefficient of the first spring 27 is less than that of the spring between the first push rod 21 and the tube 1 and is much greater than that of the second spring 293. Specifically, when the second spring 293 is compressed to its limit position, the length of the first spring 27 remains unchanged. In the winding assembly, the stiffness coefficient of the coil spring 83 is less than that of the third spring 33. Specifically, when the coil spring 83 is wound to its limit position, the length of the third spring 33 remains unchanged.

[0063] The laparoscopic scalpel provided in this application embodiment, which achieves stable cutting and blade retraction through secondary pushing, does not cause axial displacement of the blade 5 during the retraction operation, based on the application of only axial force. This avoids unnecessary cutting. That is, when the user presses the elastic telescopic push rod 2 to retract the blade 5, the blade 5 will not be displaced in the axial direction of the tube 1.

[0064] The laparoscopic scalpel provided in this application embodiment utilizes a secondary push to achieve stable cutting and blade retraction. During the operation of extending or retracting the blade 5 into the tube 1, the user only needs to apply force in the same direction at the same operating point (i.e., the end of the elastic telescopic push rod 2), making the operation convenient.

[0065] The laparoscopic scalpel provided in this application embodiment utilizes a secondary push to achieve stable cutting and blade retraction. During the process of extending or retracting the tube 1, the blade 5 can be extended or retracted by manually controlling the pushing force of the elastic telescopic push rod 2. The movement state of the blade 5 can be reliably controlled, which can facilitate the user to make timely responses in emergency situations.

[0066] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A laparoscopic surgical scalpel that utilizes a secondary thrust to achieve stable cutting and blade retraction, characterized in that, include: The pipe fitting (1) has a first limiting part (11) with an annular boss inside and coaxial with the pipe fitting (1). The inner wall of the pipe fitting (1) has a first sliding groove, and the first sliding groove has a second sliding groove from the groove wall. An elastic telescopic push rod (2) is movably inserted in the pipe fitting (1). The elastic telescopic push rod (2) has a first end and a second end that are telescopically connected. The first end is provided with a second limiting part (29) for forming an axial limit with the first limiting part (11), and the end of the first end is provided with a blade (5). The second end is elastically connected to the pipe fitting (1) and is provided with an unlocking part (28). In the axial direction of the pipe fitting (1), the projection of the second limiting part (29) and the projection of the first limiting part (11) have an overlapping area. The first limiting assembly (4) is elastically and movably connected to the pipe fitting (1). The first limiting assembly (4) includes a first slide rod and a fourth spring (42). One end of the first slide rod is connected to the bottom of the first sliding groove through the fourth spring (42), and the other end serves as a locking end (41) for cooperating with the second limiting part (29) to keep the state of the second limiting part (29). A slot (43) is provided on the arm of the first slide rod. The second limiting component (3) is elastically and movably connected to the pipe fitting (1). The second limiting component (3) includes a second slide rod and a third spring (33). One end of the second slide rod is connected to the bottom of the second sliding groove through the third spring (33) and serves as a driving part (31). The other end of the second slide rod is adapted to the slot (43) and serves as a mating part (32). The driving part (31) is used to be acted upon by the unlocking part (28) to make the second limiting component (3) move. The mating part (32) is used to cooperate with the first limiting component (4) to keep the state of the first limiting component (4). In the working state, the first limiting component (4) is activated and moves relative to the pipe fitting (1) to engage with the mating part (32); when the elastic telescopic push rod (2) is pushed to make the first limiting part (11) and the second limiting part (29) form an axial limit, the blade (5) is located outside the pipe fitting (1), and the locking end (41) engages with the second limiting part (29); when the elastic telescopic push rod (2) continues to be pushed to make itself elastically contract, the unlocking part (28) acts on the driving part (31) to make the mating part (32) disengage from the first limiting component (4).

2. The laparoscopic surgical scalpel according to claim 1, which utilizes secondary thrust to achieve stable cutting and blade retraction, is characterized in that... The second end is provided with a guide platform that slides in contact with the inner wall of the pipe fitting (1).

3. The laparoscopic surgical scalpel according to claim 2, which utilizes secondary thrust to achieve stable cutting and blade retraction, is characterized in that... The guide platform and the first limiting part (11) are concentric in the axial projection of the pipe (1).

4. The laparoscopic surgical scalpel according to claim 1, which utilizes a secondary push to achieve stable cutting and blade retraction, is characterized in that... In the axial direction of the pipe fitting (1), the blade (5) has a gap with the inner wall of the pipe fitting (1), and the gap is not less than 2 mm.

5. The laparoscopic surgical scalpel according to claim 1, which utilizes a secondary push to achieve stable cutting and blade retraction, is characterized in that... The locking end (41) and the second limiting part (29) are engaged by a telescopic clip (292).

6. The laparoscopic surgical scalpel according to claim 5, which utilizes a secondary push to achieve stable cutting and blade retraction, is characterized in that... The second limiting part (29) has a notch (291) on the side close to the first limiting part (11) and the telescopic clip (292) is located in the notch (291); when the elastic telescopic push rod (2) passes through the pipe (1), the locking end (41) can be accommodated in the notch (291).

7. The laparoscopic surgical scalpel according to claim 1, which utilizes a secondary push to achieve stable cutting and blade retraction, is characterized in that... The unlocking part (28) acts on the driving part (31) through a fixed pulley mechanism provided in the tube (1); wherein, one end of the cable (9) in the fixed pulley mechanism is connected to the unlocking part (28), and the other end of the cable (9) is connected to the driving part (31).

8. The laparoscopic surgical scalpel according to claim 7, which utilizes a secondary push to achieve stable cutting and blade retraction, is characterized in that... It also includes an elastic winding assembly (8) that is slidably connected to the tube (1), the elastic winding assembly (8) cooperating with the cable (9) so that the cable (9) can wrap around the elastic winding assembly (8) and the sliding direction of the elastic winding assembly (8) is not perpendicular to the axial direction of the tube (1).

9. The laparoscopic surgical scalpel according to claim 1, which utilizes a secondary push to achieve stable cutting and blade retraction, is characterized in that... It also includes a reset mechanism disposed within the fitting (1), the reset mechanism being used to reset the first limiting component (4) when the mating part (32) disengages from the first limiting component (4).

10. The laparoscopic surgical scalpel according to claim 1, which utilizes a secondary push to achieve stable cutting and blade retraction, is characterized in that... The first limiting component (4) is provided with an indicator and the indicator can move to the indicating state following the first limiting component (4); The pipe fitting (1) is provided with an indicator groove that communicates with the external space; When the indicator is in the indicating state, the indicator is located in the indicating slot.

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