Electric surgical instruments

Abstract

This application discloses an electric surgical instrument comprising a jaw assembly, a cannula, a cutting blade assembly, a mandrel assembly connected to the cutting blade assembly, a transmission mechanism, and a power module. The cannula is connected to the proximal end of the jaw assembly. The power module provides power to the transmission mechanism. The transmission mechanism includes a jaw drive mechanism and a cutting drive mechanism. The jaw drive mechanism drives the jaw assembly to open or close. The cutting drive mechanism drives the mandrel assembly to move, thereby driving the cutting blade assembly forward or backward. The transmission mechanism has a first state and a second state. The cutting drive mechanism includes a cutting drive component. In the first state, the cutting drive component is separated from the mandrel assembly. In the second state, the cutting drive component engages with the mandrel assembly to drive the mandrel assembly to move, thereby driving the cutting blade assembly forward or backward. The cutting drive mechanism of this application has a simple and reliable structure, a reasonable arrangement, and a compact structure, making the electric surgical instrument smaller in size and weight, suitable for use by doctors.

Description

Technical Field

[0001] This application belongs to the field of medical devices, and specifically relates to an electric surgical instrument. Background Technology

[0002] As is well known, surgical instruments are widely used in intracavitary surgeries such as abdominal surgeries.

[0003] Existing endocavitary anastomosis devices generally include a housing, a rod assembly extending longitudinally from the housing, and an end effector disposed at the distal end of the rod assembly. The end effector includes a jaw assembly and a staple cartridge assembly. The jaw assembly includes a staple cartridge assembly seat and an anvil pivotally connected to the staple cartridge assembly seat. The staple cartridge assembly seat is used to operably support the staple cartridge assembly located therein, and the anvil can selectively move between an open position and a closed position.

[0004] The housing houses a motor and at least a portion of a cutting drive mechanism and a jaw drive mechanism driven by the motor. The cutting drive mechanism drives the cutting blade assembly to advance or retract, cutting tissue during advance. The jaw drive mechanism drives the jaw assembly to close or open, clamping tissue when closed and releasing or aligning tissue when open. Furthermore, according to the working principle of surgical instruments, the tissue cutting action cannot be performed simultaneously with the jaw closing or opening action, and their actions must follow a predetermined sequence. Therefore, the transmission mechanism is required to drive the jaw assembly and cutting blade assembly in a predetermined order.

[0005] However, the existing stapler has a complex cutting drive mechanism, the overall structure of the stapler is not compact enough, the product is large in weight and size, and the operation is complicated, which is not conducive to doctors' surgery. Therefore, it is necessary to improve it. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this application aims to propose an electric surgical instrument that simplifies and compacts the cutting drive mechanism, reduces overall weight and size, and makes it easier for doctors to operate.

[0007] This application discloses an electric surgical instrument comprising a jaw assembly, a cannula, a cutting blade assembly, a mandrel assembly connected to the cutting blade assembly, a transmission mechanism, and a power module; the cannula is connected to the proximal end of the jaw assembly; the power module provides power to the transmission mechanism; the transmission mechanism includes a jaw driving mechanism and a cutting driving mechanism, the jaw driving mechanism driving the cannula to move, thereby driving the jaw assembly to open or close; the cutting driving mechanism driving the mandrel assembly to move, thereby driving the cutting blade assembly to move forward or backward; the transmission mechanism has a first state and a second state;

[0008] The cutting drive mechanism includes a cutting drive component. In the first state, the cutting drive component is separated from the mandrel assembly. In the second state, the cutting drive component engages with the mandrel assembly to drive the mandrel assembly to move, thereby driving the cutting blade assembly forward or backward.

[0009] Preferably, the power module includes a motor and a motor gear, the cutting drive component is a rack, and the motor gear meshes with the rack.

[0010] Preferably, the power module includes a motor, the jaw drive mechanism and the cutting drive mechanism are driven by the same motor, and the axis of the motor extends along the front-rear direction of the electric surgical instrument stapler.

[0011] Preferably, in the first state, the distal end of the cutting drive member is spaced apart from the proximal end of the mandrel assembly; in the second state, the distal end of the cutting drive member is engaged with the proximal end of the mandrel assembly to drive the mandrel assembly to move along a first direction, thereby driving the cutting blade assembly forward.

[0012] Preferably, the cutting drive mechanism further includes a conversion component. In the second state, the conversion component, under the action of the cutting drive member, drives the mandrel assembly to move in a second direction to drive the cutting blade assembly to retract. The second direction is opposite to the first direction.

[0013] Preferably, the conversion component includes a moving part and a motion guide, the moving part being connected to the mandrel assembly; under the action of the cutting drive, the moving part is guided by the motion guide to engage with the cutting drive, thereby driving the mandrel assembly to move in the second direction.

[0014] Preferably, the moving member includes a pivot end pivotally connected to the mandrel assembly, and a first end and a second end extending outward from the pivot end; when the cutting drive drives the mandrel assembly to move in the first direction, the first end is moved by the motion guide to engage with the cutting drive; when the cutting drive drives the moving member and thus drives the mandrel assembly to move in the second direction, the second end is moved by the motion guide to separate the first end from the cutting drive.

[0015] Preferably, the mandrel assembly includes a mandrel and a connector connected to the proximal end of the mandrel, the pivoting end being pivotally connected to the connector; the first end is provided with an embedding portion, and the distal end of the cutting drive is provided with a mating groove, the embedding portion being embedded in the mating groove to engage the moving member and the cutting drive.

[0016] Preferably, the front end face of the embedded part includes a slope or an arc surface, and the radius of rotation of the portion of the free end of the embedded part that first enters the mating groove is less than or equal to the radius of rotation of the portion that later enters the mating groove.

[0017] Preferably, the motion guide includes a recess and guide surfaces located on both sides of the recess, the guide surfaces including a first guide surface and a second guide surface; the first end moves around the pivot end to engage with the cutting drive by sliding contact with the first guide surface, and the second end moves around the pivot end by sliding contact with the second guide surface to separate the first end from the cutting drive.

[0018] Preferably, the first guide surface is located in front of the second guide surface.

[0019] Preferably, the motion guide is fixedly connected to the housing of the electric surgical instrument, or is integrally formed with the housing of the electric surgical instrument.

[0020] Preferably, the conversion component includes a moving part and a motion guide, the moving part being connected to the cutting drive; under the action of the cutting drive, the moving part is guided by the motion guide to engage with the mandrel assembly, thereby driving the mandrel assembly to move in a second direction.

[0021] Preferably, the moving member includes a pivot end pivotally connected to the cutting drive member, and a first end and a second end extending outward from the pivot end; when the cutting drive member moves along the first direction, the first end is moved by the motion guide to engage with the mandrel assembly; when the cutting drive member drives the moving member and thus drives the mandrel assembly to move along the second direction, the second end is moved by the motion guide to separate the first end from the mandrel assembly.

[0022] Preferably, the mandrel assembly includes a mandrel and a connector connected to the proximal end of the mandrel; the first end is provided with an embedding portion, and the connector is provided with a mating groove, wherein the embedding portion is embedded in the mating groove to engage the moving member and the mandrel assembly, or disengages from the mating groove to separate the moving member and the mandrel assembly.

[0023] Preferably, the motion guide includes a recess and guide surfaces located on both sides of the recess, the guide surfaces including a first guide surface and a second guide surface; the first end moves about the pivot end to engage with the mandrel assembly by sliding contact with the first guide surface, and the second end moves about the pivot end by sliding contact with the second guide surface to separate the first end from the mandrel assembly.

[0024] Preferably, the motion guide further includes a cutout portion located below the recess and / or the guide surface.

[0025] Preferably, the jaw driving mechanism includes a jaw driving component and a motion conversion component rotatably connected to the jaw driving component. The jaw driving component and the sleeve are connected through the motion conversion component. The motion conversion component drives the sleeve to move, thereby driving the jaw assembly to open or close. The jaw driving component, the motion conversion component, and the sleeve constitute a crank-slider mechanism.

[0026] In the second state, the jaw drive is coupled to the power module, and the jaw drive and the motion conversion component are at the dead point position of the crank-slider mechanism.

[0027] Preferably, the electric surgical instrument further includes a blocking part for limiting the motion conversion element to the dead point position.

[0028] Preferably, the jaw driving mechanism includes a jaw driving component and a motion conversion component rotatably connected to the jaw driving component. The jaw driving component and the sleeve are connected through the motion conversion component. The motion conversion component drives the sleeve to move, thereby driving the jaw assembly to open or close. The jaw driving component, the motion conversion component, and the sleeve constitute a crank-slider mechanism.

[0029] In the second state, the jaw drive is coupled to the power module, and the jaw drive and the motion converter pass the dead point position of the crank-slider mechanism; the electric surgical instrument further includes a blocking part for blocking the motion converter after it passes the dead point position.

[0030] Preferably, the motion conversion component includes a connecting rod, one end of which is rotatably connected to the jaw drive component, and the other end of which is rotatably connected to the sleeve.

[0031] Preferably, the motion conversion component includes a connecting rod and a slider, one end of the connecting rod is rotatably connected to the jaw drive component, the other end of the connecting rod is rotatably connected to the slider, and the slider is fixedly connected to the sleeve.

[0032] Compared with the prior art, the beneficial effects of this application are as follows: the cutting drive mechanism of this application has a simple and reliable structure, reasonable arrangement, and compact structure, which makes the size and weight of the electric surgical instruments smaller and more suitable for doctors to use. Attached Figure Description

[0033] Figure 1A schematic diagram of the structure of an electric stapler according to a first embodiment of this application is shown.

[0034] Figure 2 A schematic diagram of the internal structure of an electric stapler according to a first embodiment of this application is shown at one angle.

[0035] Figure 3 It shows Figure 2 Enlarged view of section A.

[0036] Figure 4 A schematic diagram of the internal structure of an electric stapler according to a first embodiment of this application is shown from another angle.

[0037] Figure 5 It shows Figure 4 Enlarged view of section B.

[0038] Figure 6 A schematic diagram of the structure of the motor gear, the first jaw drive gear, and the second jaw drive gear of the electric stapler according to the first embodiment of this application is shown.

[0039] Figure 7 A schematic diagram of the structure of the first jaw drive gear of the electric stapler according to the first embodiment of this application is shown.

[0040] Figure 8 A top view of the jaw drive mechanism of the electric stapler according to the first embodiment of this application in the jaw open state is shown.

[0041] Figure 9 A top view of the jaw drive mechanism of the electric stapler according to the first embodiment of this application in the jaw closed state is shown.

[0042] Figures 10a to 10f A schematic diagram showing the state changes of the jaw drive member of the electric stapler according to the first embodiment of this application is shown.

[0043] Figure 11 An exploded view of the cutting drive mechanism of an electric stapler according to a first embodiment of this application is shown.

[0044] Figure 12 A schematic diagram of the motion guide of an electric stapler according to a first embodiment of this application is shown.

[0045] Figure 13 A schematic diagram of the moving parts of an electric stapler according to a first embodiment of this application is shown.

[0046] Figure 14 A schematic diagram of the cutting drive component of an electric stapler according to a first embodiment of this application is shown.

[0047] Figures 15a to 15e A schematic diagram showing the structure and state changes of the cutting drive mechanism of the electric stapler according to the first embodiment of this application is shown.

[0048] Figure 16 An exploded view of a portion of the cutting drive mechanism of an electric stapler according to a second embodiment of this application is shown.

[0049] Figure 17 A schematic diagram of the cutting drive mechanism of an electric stapler according to a second embodiment of this application is shown.

[0050] Figure 18 A schematic diagram of the connecting member of the cutting drive mechanism of the electric stapler according to the second embodiment of this application is shown.

[0051] Figure 19 A schematic diagram of the cutting drive component of the cutting drive mechanism of the electric stapler according to the second embodiment of this application is shown.

[0052] Figure 20 A schematic diagram of the motion guide of the cutting drive mechanism of the electric stapler according to the second embodiment of this application is shown.

[0053] Figures 21a to 21e A schematic diagram showing the structure and state changes of the cutting drive mechanism of the electric stapler according to the second embodiment of this application is shown.

[0054] Explanation of reference numerals in the attached figures

[0055] 10 Operating Components 20 Rod Body Assembly 201 Spindle 202 Sleeve 30 End Actuator 31 Pin Magazine Seat 32 Pin Anchor Seat 40 Cutting Blade Assembly 401 Blade Bar 402 Blade Head 50 Motor

[0056] 1. Jaw drive mechanism

[0057] 11 Motor gears

[0058] 12 First jaw drive gear 121 Meshing part 122 Smooth part 123 First mating part 124 Protrusion

[0059] 13 Second jaw drive gear 131 Second mating part

[0060] 14-link

[0061] 15 sliders

[0062] 2 Cutting drive mechanism

[0063] 21 Cutting drive component 211 Joint groove

[0064] 22 Motion guide 221 First inclined plane 222 Second inclined plane 223 Plane

[0065] 23 Connector 231 Contact surface 232 Third inclined surface 24 Moving part 25 Pin. Detailed Implementation

[0066] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0067] It is important to understand that the terms "proximal," "posterior," "distal," and "anterior" used in this article are relative to the clinician manipulating the stapler. The terms "proximal" and "posterior" refer to the part of the stapler that is relatively close to the clinician (or, relatively close to the operating component 10 of the stapler, see [link]). Figure 1 In the part of the term "far" or "anterior," it refers to the part that is relatively far from the clinician (or, relatively far from the operating component 10 of the stapler, or relatively close to the end actuator 30 of the stapler, see [link]). Figure 1 The terms "upper" and "lower" refer to the relative positions of the anvil and stapler housing in the jaw assembly; specifically, the anvil is "upper" and the stapler housing is "lower." However, staplers can be used in many orientations and positions, so these terms expressing relative positional relationships are not limited or absolute.

[0068] In this application, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, a movable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements, such as contact. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. It should be noted that when "connected" or "linked" is preceded by a qualifier, it has the meaning defined by that qualifier, excluding only obviously excluded cases, but not other possible cases. For example, "detachable connection" refers to a detachable connection, excluding an integral part, but movable connections are not excluded.

[0069] (First Implementation)

[0070] like Figures 1 to 5As shown, the electric stapler includes an operating assembly 10, a rod assembly 20 extending forward from the operating assembly 10, an end effector 30 located at the distal end (front end) of the rod assembly 20, and a cutting blade assembly 40 for performing tissue cutting (see [reference]). Figure 11 ).

[0071] The operating component 10 includes a housing, a power module disposed within the housing, and a power supply module disposed within the housing. The power supply module provides the necessary electrical energy to the motor 50. The power module may include the motor 50 and a motor gear 11 connected to the output shaft of the motor 50. The axis of the motor 50 may extend along the front-rear direction of the electric stapler.

[0072] The rod assembly 20 includes a mandrel 201 and a sleeve 202 fitted onto the mandrel 201. The electric stapler also includes a transmission mechanism connected to the output shaft of the motor 50, which includes a jaw drive mechanism 1 and a cutting drive mechanism 2. The sleeve 202 can be driven by the jaw drive mechanism 1 to move axially, i.e., forward or backward, and the mandrel 201 can be driven by the cutting drive mechanism 2 to move axially. Both the sleeve 202 and the mandrel 201 can move axially forward (in the first direction) or backward (in the second direction).

[0073] The end effector 30 includes a jaw assembly and a staple cartridge assembly. The jaw assembly includes a staple cartridge seat 31 and an abutment 32 pivotally connected to the staple cartridge seat 31 for operably supporting the staple cartridge assembly therein. The abutment 32 is selectively movable between an open position and a closed position, enabling switching between the open and closed states, thereby cooperating with the staple cartridge seat 31 and the staple cartridge assembly to clamp or release tissue.

[0074] One end (front end) of the sleeve 202 is connected to the anvil 32, and the other end (rear end) is connected to the jaw drive mechanism 1. The jaw drive mechanism 1 can drive the sleeve 202 to move backward or forward. The backward movement of the sleeve 202 can cause the anvil 32 to pivot upward to open the jaw assembly, and the forward movement of the sleeve 202 can cause the anvil 32 to pivot downward to close the jaw assembly.

[0075] See Figure 11 The cutting blade assembly 40 is connected to the spindle assembly to be driven by the spindle assembly to perform a firing or retracting action. Specifically, the cutting blade assembly 40 includes a blade holder 401 and a blade head 402 connected to the blade holder 401. The spindle assembly includes a spindle 201 and a connector 23 connected to the proximal end of the spindle 201. The distal end of the spindle 201 is connected to the proximal end of the blade holder 401.

[0076] The proximal end (rear end) of the mandrel 201 is connected to the cutting drive mechanism 2, while the distal end (front end) is located within the sleeve 202. During cutting and suturing, the cutter head 402 is positioned within the space formed between the staple cartridge seat 31 and the staple seat 32 of the jaw assembly. The cutting drive mechanism 2 can drive the mandrel 201 to move forward and backward. When the staple cartridge assembly is installed, the forward movement of the mandrel 201 causes the cutting blade assembly 40 to move forward, cutting the tissue and pushing the staples out of the staple cartridge assembly to suture the tissue. When the mandrel 201 moves backward, it causes the cutting blade assembly 40 to move backward to return to its initial position.

[0077] The housing of the operating component 10 includes a handle housing and a head housing connected in position. The head housing houses the transmission mechanism, and the handle housing is for the user to hold. Of course, in some embodiments, the handle housing may also house part of the transmission mechanism.

[0078] The process of cutting and suturing tissue with an electric stapler includes:

[0079] Jaw assembly closure: Motor 50 first drives the jaw assembly to close via jaw drive mechanism 1, thereby clamping the tissue.

[0080] Cutting blade assembly 40 is fired: Motor 50 drives cutting blade assembly 40 forward via cutting drive mechanism 2 to cut and suture tissue.

[0081] Cutting blade assembly 40 retracts: Motor 50 drives cutting blade assembly 40 to retract via cutting drive mechanism 2.

[0082] Jaw assembly opening: Motor 50 drives jaw assembly to open via jaw drive mechanism 1 to loosen tissue, thereby realizing the function of stapler cutting and suturing.

[0083] like Figures 1 to 10f As shown, the jaw drive mechanism 1 includes a jaw drive component and a motion conversion component rotatably connected to the jaw drive component. The jaw drive component and the sleeve 202 are connected via the motion conversion component, which drives the sleeve 202 to move, thereby driving the jaw assembly to open or close. The jaw drive component, the motion conversion component, and the sleeve 202 constitute a crank-slider mechanism.

[0084] In one embodiment, the transmission mechanism has a first state and a second state. In the first state, the jaw drive engages with the power module. In the second state, the jaw drive couples with the power module, and the jaw drive and the motion converter pass the dead center position of the crank-slider mechanism. Engagement and coupling together achieve selective engagement. Coupling refers to the termination of engagement due to the absence of a suitable structure between mating components caused by changes in their relative position or state. Changes in relative position include, but are not limited to, relative rotation between components. The electric anastomosis device also includes a blocking portion 17 located on one side of the axis of the sleeve 202; the blocking portion 17 is used to block the movement of the motion converter after it passes the dead center position.

[0085] After the jaw drive and motion converter have passed the dead center position of the crank-slider mechanism, the blocking part 17 prevents them from moving further. The blocking part 17 makes the crank and connecting rod of the crank-slider mechanism form an angle, for example, 5 degrees to 20 degrees, with respect to when they are at the dead center position of the crank-slider mechanism. It is understood that as long as the jaw drive and motion converter have passed the dead center position, the angle can be greater than 0 degrees and less than 5 degrees.

[0086] In this embodiment, the crank-slider mechanism of the jaw drive mechanism can achieve self-locking after the jaws are closed, ensuring that the jaw assembly will not open during the processes of blade advance, cutting, and retraction. The technical solution adopted in this application does not require a complex locking mechanism; a simple blocking component is sufficient for locking. The overall structure is simple, and the reduced product weight facilitates operation by doctors. In addition, improved reliability ensures the safety of the surgery.

[0087] The following will provide a detailed description of this embodiment.

[0088] The motor gear 11 is rotatably mounted on the housing. The motor gear 11 can be driven by the motor 50, for example, by a bevel gear set, so that the rotation axis of the motor gear 11 is perpendicular to the rotation axis of the motor 50. The motor gear 11 can be a spur gear, and the motor gear 11 serves as the driving gear for driving the jaws of the jaw drive mechanism 1.

[0089] The jaw drive includes a first jaw drive gear 12. In the circumferential direction of the first jaw drive gear 12, the first jaw drive gear 12 includes an engagement portion 121 and a smooth portion 122. In a first state, the engagement portion 121 engages with the power module; in a second state, the smooth portion 122 is coupled to the power module.

[0090] The gear shaft 16 can be mounted on the housing of the operating assembly 10, and the first jaw drive gear 12 is rotatably mounted on the gear shaft 16. The diameter of the smooth portion 122 is smaller than the diameter of the meshing portion 121, so that the smooth portion 122 will not interfere with the motor gear 11. For example, the diameter of the smooth portion 122 is equal to the diameter of the tooth root of the meshing portion 121. The motor gear 11 is located in the spatial region where the smooth portion 122 is located and does not contact the smooth portion 122. Since the smooth portion 122 has no teeth, it is not driven during the coupling process between the smooth portion 122 and the motor gear 11.

[0091] In this embodiment, the arc length corresponding to the meshing portion 121 can be smaller than the arc length corresponding to the smooth portion 122. The meshing portion 121 of the first jaw drive gear 12 meshes with the motor gear 11, so that the motor gear 11 can drive the first jaw drive gear 12 to rotate a certain angle. The angle through which the first jaw drive gear 12 rotates under the drive of the motor gear 11 is the same as the central angle corresponding to the meshing portion 121.

[0092] The first jaw drive gear 12 is provided with a protrusion 124, which protrudes from the outer surface of the first jaw drive gear 12 and can be cylindrical. A connecting rod 14 is connected to the protrusion 124, so that the connecting rod 14 is rotatably connected to the first jaw drive gear 12 around the protrusion 124.

[0093] The jaw drive also includes a second jaw drive gear 13, which is rotatably mounted on the gear shaft 16. The second jaw drive gear 13 and the first jaw drive gear 12 are coaxially arranged. The second jaw drive gear 13 and the first jaw drive gear 12 are stacked, and the diameters of the second jaw drive gear 13 and the first jaw drive gear 12 (more precisely, the meshing portion 121) are the same. In both the first and second states, the second jaw drive gear 13 is engaged with the power module. In the first state, the motor gear 11 meshes with both the first jaw drive gear 12 and the second jaw drive gear 13. In the second state, the motor gear 11 is coupled with the first jaw drive gear 12 and meshes with the second jaw drive gear 13. When the smooth portion 122 is coupled with the power module, the second jaw drive gear 13 can drive the first jaw drive gear 12 from the state of coupling between the smooth portion 122 and the power module to the state of engagement between the meshing portion 121 and the power module.

[0094] More specifically, the second jaw drive gear 13 can be disposed below the first jaw drive gear 12. The first jaw drive gear 12 is provided with a first mating part 123, and the second jaw drive gear 13 is provided with a second mating part 131. When the smooth part 122 is in a coupled state with the power module, the first mating part 123 and the second mating part 131 cooperate with each other to drive the first jaw drive gear 12 to move. The first mating part 123 and the second mating part 131 can be disengaged. The first mating part 123 is disposed on the surface of the first jaw drive gear 12 facing the second jaw drive gear 13. For example, the first mating part 123 can be the end face of a groove, the groove can be arc-shaped, and the axis of the groove can coincide with the axis of the first jaw drive gear 12.

[0095] The second mating part 131 can be a protrusion (e.g., a protruding cylinder). It can be understood that the first mating part 123 can be a protrusion, and the second mating part 131 is the end of a groove.

[0096] As the first jaw drive gear 12 and the second jaw drive gear 13 rotate relative to each other, the first mating part 123 and the second mating part 131 can separate or engage (here, abut). When the first mating part 123 and the second mating part 131 are engaged, that is, when the protrusion abuts against the end face of the groove, the second jaw drive gear 13 can drive the first jaw drive gear 12 to rotate together by pushing the end face of the groove with the protrusion, and can switch from the coupling state with the power module to the engagement state with the power module. When the first mating part 123 and the second mating part 131 are separated, that is, when the protrusion leaves the end face of the groove, the first jaw drive gear 12 and the second jaw drive gear 13 can rotate independently.

[0097] In one possible implementation, the motion conversion component includes a connecting rod 14, one end of which is rotatably connected to a jaw drive component, and the other end of which is rotatably connected to a sleeve 202. When the first jaw drive gear 12 rotates, it drives the connecting rod 14 to move, thereby moving the sleeve 202 and achieving the closing or opening of the jaw assembly.

[0098] In another possible implementation, the motion conversion component includes a connecting rod 14 and a slider 15. One end of the connecting rod 14 is rotatably connected to the jaw drive component, and the other end of the connecting rod 14 is rotatably connected to the slider 15, which is fixedly connected to the sleeve 202. The slider 15 is slidably mounted relative to the operating assembly 10 in the front-to-back direction. The first jaw drive gear 12, the connecting rod 14, and the slider 15 constitute a crank-slider mechanism. When the first jaw drive gear 12 rotates, the slider 15 can drive the sleeve 202 to move in the front-to-back direction. When the slider 15 drives the sleeve 202 forward, the jaw assembly closes; when the slider 15 drives the sleeve 202 backward, the jaw assembly opens. Figure 8As shown, the housing of the operating component 10 is also provided with a blocking part 17. Here, the blocking part 17 can be fixedly installed on the housing of the operating component 10 (the housing of the electric stapler), or integrally formed on the housing of the operating component 10 (the housing of the electric stapler). The blocking part 17 is located on one side of the axis of the sleeve 202, and the blocking part 17 can block the movement of the connecting rod 14. The first jaw drive gear 12 from... Figure 8 Initially, the linkage rotates counterclockwise, causing the slider 15 to move further away. When the extension direction of the linkage 14 is parallel to the front-back direction (this position is called the dead point position), the slider 15 reaches its farthest limit position, at which point the linkage approaches the blocking part 17.

[0099] like Figure 9 As shown, the first jaw drive gear 12 continues to rotate counterclockwise by an angle, for example, 5 degrees. The meshing part 121 of the first jaw drive gear 12 disengages from the motor gear 11. That is, when the connecting rod 14 contacts the blocking part 17, the meshing part 121 of the motor gear 11 and the first jaw drive gear 12 just disengages. It can be understood that when the jaw assembly clamps the tissue, the tissue also exerts force on the jaw assembly, causing the jaw assembly to tend to open. This force is transmitted to the sleeve 202 and the slider 15, and the sleeve 202 and the slider 15 are subjected to a rearward force. In the state where the meshing part 121 of the motor gear 11 and the first jaw drive gear 12 is disengaged, the connecting rod 14 has passed the dead point position. At this time, the rearward force on the slider 15 will cause the first jaw drive gear 12 to tend to rotate in the original direction, but the blocking part 17 can block the connecting rod 14, thereby preventing the first jaw drive gear 12 from continuing to rotate, preventing the slider 15 from moving backward, and preventing the jaw assembly from opening.

[0100] The motor gear 11 can drive the cutting drive mechanism 2 to control the cutting blade assembly 40 to perform firing or retraction actions. The motor gear 11 drives the second jaw drive gear 13 to rotate, but does not drive the first jaw drive gear 12. The blocking part 17 blocks the movement of the connecting rod 14 at a suitable position. No complex locking mechanism is required. Locking can be achieved with only a simple blocking part. The overall structure is simple, and the jaw assembly can be kept closed during the movement of the cutting blade assembly 40.

[0101] It is understandable that the cutting blade assembly 40 can only move when the jaw assembly is closed and clamping the tissue. During the movement of the cutting blade assembly 40, the jaw assembly closes and clamps the tissue, and the jaw assembly can only open after the cutting blade assembly 40 retracts.

[0102] pass Figure 8 , Figure 9 , 10a to Figure 10fThis describes the working state of the jaw drive mechanism 1 during the process of cutting and suturing tissue with an electric stapler.

[0103] like Figure 8 and Figure 10a As shown, in the initial state, the jaw assembly is open, and the motor gear 11 simultaneously meshes with the first jaw drive gear 12 and the second jaw drive gear 13. During the gradual closing of the jaw assembly, the motor gear 11 rotates clockwise, driving the first jaw drive gear 12 and the second jaw drive gear 13 to rotate counterclockwise. The first jaw drive gear 12 drives the slider 15 forward via the connecting rod 14, and the slider 15 drives the sleeve 202 forward, causing the jaw assembly to gradually close.

[0104] The first jaw drive gear 12 and the second jaw drive gear 13 rotate together through a certain angle. When the extension direction of the connecting rod 14 is parallel to the front-rear direction, the crank-slider mechanism reaches the dead point position. At the dead point position, the first jaw drive gear 12 is about to disengage from the motor gear 11, the connecting rod 14 is about to contact the blocking part 17, the slider 15 reaches the extreme position at its foremost end, and the jaw assembly is completely closed.

[0105] like Figure 9 and Figure 10b As shown, the motor gear 11 continues to rotate clockwise by a small angle, causing the crank-slider mechanism to pass the dead center position. At this point, the elastic deformation of the slider and connecting rod is partially released, and the slider does not move backward, thus not affecting the clamping of the tissue by the jaw assembly. The connecting rod 14 contacts the blocking part 17, and the meshing part 121 of the first jaw drive gear 12 disengages from the motor gear 11. The motor gear 11 can no longer drive the first jaw drive gear 12 to rotate, but only drives the second jaw drive gear 13 to rotate. The blocking part 17 blocks the connecting rod 14, preventing the first jaw drive gear 12 from continuing to rotate under the force exerted by the tissue on the jaw assembly, thereby keeping the jaw assembly in a closed state.

[0106] like Figure 10c As shown, the first jaw drive gear 12 is coupled to the motor gear 11. When the motor gear 11 continues to rotate clockwise, the first jaw drive gear 12 remains stationary, while the motor gear 11 drives the second jaw drive gear 13 to rotate counterclockwise, causing the first mating part 123 and the second mating part 131 to separate. At the same time, the motor gear 11 drives the cutting blade assembly 40 to fire through the cutting drive mechanism 2.

[0107] like Figure 10dAs shown, after firing, a return motion is performed. The motor gear 11 rotates counterclockwise, and the motor gear 11 drives the cutting blade assembly 40 to perform the return motion via the cutting drive mechanism 2. Simultaneously, the motor gear 11 drives the second jaw drive gear 13 to rotate clockwise, causing the first mating part 123 and the second mating part 131 to gradually approach each other. Figure 10e As shown, at the end of the cutter return, the first mating part 123 and the second mating part 131 engage again, while the jaw assembly remains closed.

[0108] like Figure 10f As shown, the motor gear 11 continues to rotate counterclockwise, driving the second jaw drive gear 13 to rotate clockwise. The second mating part 131 pushes the first mating part 123, causing the first jaw drive gear 12 to rotate clockwise along with the second jaw drive gear 13. After the first jaw drive gear 12 rotates a certain angle, the meshing part 121 of the first jaw drive gear 12 and the motor gear 11 mesh again. Then, the motor gear 11 can drive the first jaw drive gear 12 to rotate clockwise, causing the jaw assembly of the electric stapler to open and return to its initial state.

[0109] In another embodiment, the difference from the previous embodiment is that, when the transmission mechanism is in the second state, the jaw drive is coupled to the power module, and the jaw drive and motion converter are at the dead point position of the crank-slider mechanism. That is, when the transmission mechanism is in the second state, the jaw drive and motion converter are at the dead point position of the crank-slider mechanism. At the dead point position, the crank (jaw drive) and connecting rod (motion converter) of the crank-slider mechanism are on the same straight line, that is, the line connecting the axis of the jaw drive and the connection position of the motion converter is collinear with the motion converter. In this embodiment, when the motor drives the connecting rod 14 to its dead point position, the meshing part 121 of the first jaw drive gear 12 disengages from the motor gear 11. At this time, the jaw assembly is closed. Because the meshing part 121 of the first jaw drive gear 12 disengages from the motor gear 11, the motor gear 11 cannot drive the first jaw drive gear 12 to continue rotating. The motion converter cannot drive the jaw drive to move, and the crank-slider mechanism achieves self-locking, allowing the jaw assembly to remain in the closed state.

[0110] In this embodiment, the blocking part 17 is not essential. To further increase stability, the electric stapler may optionally include a blocking part 17 located on one side of the axis of the sleeve 202. During the forward movement of the sleeve 202 driven by the motion conversion member, the blocking part 17 can contact and block the motion conversion member, limiting the motion conversion member to a dead position. The blocking part 17 can stably hold the motion conversion member in the dead position, thereby maintaining a stable closed state of the jaw assembly.

[0111] By utilizing the dead-point characteristic of the crank-slider mechanism of the jaw drive mechanism, self-locking can be achieved when the connecting rod 14 is in the dead-point position. Even if the sleeve 202 or the slider 15 connected to the sleeve 202 is subjected to the force of the jaw assembly, the sleeve 202 or the slider 15 connected to the sleeve 202 cannot drive the connecting rod 14 to rotate. Therefore, the jaw drive mechanism or jaw closing and holding structure is simplified, and a separate locking mechanism is not required. This reduces the difficulty of operation for users, reduces the number of parts, and simplifies the structure of the device.

[0112] As described above, the electric stapler also includes a cutting blade assembly 40 and a spindle assembly connected to the cutting blade assembly 40; the transmission mechanism also includes a cutting drive mechanism 2, which drives the spindle assembly to move, thereby driving the cutting blade assembly 40 forward or backward; the cutting drive mechanism 2 includes a cutting drive component 21, which is separated from the spindle assembly in a first state; in a second state, the cutting drive component 21 engages with the spindle assembly to drive the spindle assembly to move, thereby driving the cutting blade assembly 40 forward or backward. The cutting drive mechanism has a simple and reliable structure, a reasonable arrangement, and a compact structure, making the electric stapler smaller in size and weight, suitable for doctors to use.

[0113] The jaw drive mechanism 1 and the cutting drive mechanism 2 of the transmission mechanism are interconnected, so that the opening and closing of the jaws and the forward and backward movement of the cutting blade can be carried out in accordance with the process of cutting and suturing tissue by an electric stapler.

[0114] In this embodiment, in the first state, the distal end of the cutting drive member 21 is spaced apart from the proximal end of the mandrel assembly; in the second state, the distal end of the cutting drive member 21 engages with the proximal end of the mandrel assembly to drive the mandrel assembly to move along the first direction, thereby driving the cutting blade assembly 40 forward. The engagement of element A and element B means that element A and element B are at least partially in contact, and under external force, element A can drive element B to move. That is, in the first state, there is a "free travel" between the distal end of the cutting drive member 21 and the proximal end of the mandrel assembly; in the second state, the cutting drive member 21 has completed this "free travel" and engages with the mandrel assembly, thereby driving the mandrel assembly to move along the first direction. This technical solution has a simple and reliable structure, a reasonable overall layout, resulting in a compact structure, smaller product size, reduced overall weight, and suitability for doctors.

[0115] like Figures 1 to 5 , Figures 11 to 15eAs shown, the cutting drive mechanism 2 also includes a conversion assembly. In the second state, under the action of the cutting drive member 21, the conversion assembly drives the mandrel assembly to move in a second direction to drive the cutting blade assembly 40 to retract, the second direction being opposite to the first direction. The presence of the conversion assembly allows the mandrel assembly to be driven to move in the second direction. Since the mandrel assembly is connected to the cutting blade assembly 40, the cutting blade assembly 40 can retract, thereby facilitating the opening of the jaw assembly to meet the requirements of surgery. The conversion assembly includes a moving member 24 and a movement guide 22. The moving member 24 is connected to the mandrel assembly. Under the action of the cutting drive member 21, the moving member 24 is guided by the movement guide 22 to move to engage with the cutting drive member 21, thereby driving the mandrel assembly to move in the second direction. More specifically, the moving member 24 includes a pivot end pivotally connected to the mandrel assembly, and a first end and a second end extending outward from the pivot end. When the cutting drive member 21 drives the mandrel assembly to move in the first direction, the first end is moved by the movement guide 22 to engage with the cutting drive member 21. When the cutting drive 21 drives the moving part 24, which in turn drives the mandrel assembly to move along the second direction, the second end is moved by the motion guide 22 to separate the first end from the cutting drive 21. The cooperation between the moving part 24 and the motion guide 22 of the conversion assembly allows the mandrel assembly to return to its initial position. The overall structure of the conversion assembly is simple and compact, and has high reliability.

[0116] More specifically, the mandrel assembly includes a mandrel 201 and a connector 23 connected to the proximal end of the mandrel 201. The pivot end of the moving member 24 can be pivotally connected to the connector 23 via a pin 25. The distal end of the mandrel 201 is connected to the cutting blade assembly 40. The mandrel 201 drives the cutting blade assembly 40 to move forward to perform a firing action or to move backward to perform a retraction action. The first end of the moving member 24 is provided with an insert 241, and the distal end of the cutting drive member 21 is provided with a engagement groove. The insert 241 is inserted into the engagement groove to engage the moving member 24 and the cutting drive member 21, or it is disengaged from the engagement groove to separate the moving member 24 and the cutting drive member 21. When the insert 241 is inserted into the engagement groove, the sidewall of the engagement groove 211 can abut against the front end face 242 of the insert 241, causing the cutting drive member 21 and the connector 23 to engage, thereby driving the moving member 24 and the connector 23 to move backward together. The front end face 242 of the insert 241 can be an arc surface or a slope, and the radius of rotation of the portion of the front end face 242 that first enters the engagement groove 211 is less than or equal to the radius of rotation of the portion that later enters the engagement groove 211. During tool retraction, this facilitates the easy exit of the insert 241 from the engagement groove 211, preventing the moving part 24 from getting stuck.

[0117] The connector 23 has a contact surface 231 facing the cutting drive 21. The contact surface 231 can be the end face of the nearest end of the connector 23. By pushing the cutting drive 21 against the contact surface 231, the connector 23 can be pushed forward. The cutting drive 21 extends along the front-rear direction of the electric stapler. The cutting drive 21 and the connector 23 can be slidably connected relative to each other in the front-rear direction. For example, the cutting drive 21 can be provided with a groove, and the connector 23 can be provided with a sliding fit part, which is embedded in the groove. This makes the movement of the cutting drive smoother and more stable. The cutting drive 21 meshes with the motor gear 11, and the motor gear 11 can drive the cutting drive 21 to move in the front-rear direction. The cutting drive 21 is provided with a mating groove 211, and the moving part 24 can be partially embedded in the mating groove 211, so that the moving part 24 can move together with the cutting drive 21 in the front-rear direction. The moving part 24 can engage the cutting drive 21 and the connecting part 23 so that the cutting drive 21 and the mandrel 201 move together in the front-back direction. Furthermore, the moving part 24 can separate the cutting drive 21 and the connecting part 23 so that the cutting drive 21 can move relative to the mandrel 201 in the front-back direction.

[0118] In this embodiment, the cutting drive component 21 is a rack and pinion. Of course, it can be understood that the cutting drive component 21 can also be a lead screw, nut, or other mechanism that can achieve linear motion.

[0119] The motion guide 22 can be fixedly connected to the housing of the operating component 10 (i.e., the housing of the electric stapler), or integrally formed with the housing of the operating component 10 (i.e., the housing of the electric stapler). The motion guide 22 includes a recess and guide surfaces located on both sides of the recess, the guide surfaces including a first guide surface and a second guide surface; the first end of the motion member 24 moves about its pivot end to engage with the cutting drive member 21 by sliding contact with the first guide surface, and the second end of the motion member 24 moves about its pivot end by sliding contact with the second guide surface to separate the first end from the cutting drive member 21. In this embodiment, the first guide surface includes a first inclined surface 221 and a plane 223, and the second guide surface includes a second inclined surface 222, the first inclined surface 221, the second inclined surface 222, and the plane 223 all facing the motion member 24. Of course, it is understood that the first guide surface and the second guide surface can also be other forms such as curved surfaces.

[0120] The first inclined surface 221 can be located in front of the second inclined surface 222. The more forward the first inclined surface 221 extends, the closer it is to the side where the moving member 24 is located (e.g., the upper side). The more backward the second inclined surface 222 extends, the closer it is to the side where the moving member 24 is located. The plane 223 can be located in front of the first inclined surface 221 and is parallel to the front-back direction. When the moving member 24 moves in the front-back direction with the connecting member 23, the moving member 24 can contact the first inclined surface 221 and the second inclined surface 222, thereby causing the moving member 24 to rotate. When the moving member 24 moves in the front-back direction with the connecting member 23, the moving member 24 can maintain contact with the plane 223, thereby preventing the moving member 24 from rotating. When the cutting drive 21 moves forward and the moving member 24 rotates upon contact with the first inclined surface 221, the moving member 24 engages the cutting drive 21 and the connecting member 23. However, the connecting member 23 does not move forward due to the engagement of the cutting drive 21 and the connecting member 23; the engagement is to allow the connecting member 23 to move backward with the cutting drive 21. When the cutting drive 21 moves backward and the moving member 24 rotates upon contact with the second inclined surface 222, the moving member 24 disengages the cutting drive 21 and the connecting member 23, thereby allowing the cutting drive 21 to move relative to the connecting member 23 in the front-back direction.

[0121] pass Figures 1 to 5 and Figures 15a to 15e This describes the working status of the cutting drive mechanism 2 during the process of the electric stapler cutting and suturing tissue.

[0122] like Figure 15a As shown, in the initial state, the jaw assembly is open, the cutting blade assembly is at the proximal end, and the contact surfaces 231 of the cutting drive member 21 and the connecting member 23 are spaced apart. The motor gear 11 rotates, causing the jaw assembly to close via the jaw drive mechanism 1, while simultaneously driving the cutting drive member 21 forward a certain distance. Figure 9 and 15b As shown, when the jaw assembly is fully closed, i.e., when the connecting rod 14 contacts the blocking part 17, the cutting drive member 21 also comes into contact with the contact surface 231. The cutting drive member 21 continues to move forward, which causes the connecting member 23 to push the cutting blade assembly 40 forward to perform the firing action. As the connecting member 23 moves forward, the first end of the moving member 24 contacts the first inclined surface 221.

[0123] As shown in 15c, the cutting drive 21 pushes the connecting member 23 forward together. After the first end of the moving member 24 contacts the first inclined surface 221, the moving member 24 moves along the first inclined surface 221. Figure 15cThe clockwise rotation causes the insert 241 to engage with the groove 211. As the connector 23 continues to move forward, the bottom surface of the moving member 24 remains in contact with the plane 223. After the firing action ends, the retraction action begins, the motor gear 11 rotates in the opposite direction, driving the cutting drive member 21 to move backward. The side wall of the groove 211 abuts against the insert 241, and the moving member 24 and the connector 23 can move backward with the cutting drive member 21.

[0124] like Figure 15d and Figure 15e As shown, as the cutting drive 21 moves backward, after the second end of the moving part 24 contacts the second inclined surface 222, the moving part 24 moves along the second inclined surface 222 under the action of the second inclined surface 222. Figure 15d The insert 241 rotates counterclockwise, causing it to disengage from the engagement groove 211. After the insert 241 disengages from the engagement groove 211, the moving part 24 and its connected connector 23 no longer move backward with the cutting drive 21, indicating that the retraction action is complete. The motor gear 11 drives the cutting drive 21 to continue moving backward, returning to the starting position. Figure 15a The initial state is shown.

[0125] (Second Implementation)

[0126] The electric stapler of the second embodiment is generally similar to the electric stapler of the first embodiment, but the specific structure of the cutting drive mechanism differs. Components in the cutting drive mechanism of the second embodiment that are identical or similar to those in the first embodiment are represented by the same reference numerals, and detailed descriptions of these identical or similar components are omitted. Figures 16 to 21e As shown, the cutting drive mechanism 2 includes a cutting drive component 21 and a conversion assembly. The conversion assembly includes a moving component 24 and a motion guide 22. The moving component 24 is connected to the cutting drive component 21. Under the action of the cutting drive component 21, the moving component 24 is guided by the motion guide 22 to engage with the mandrel assembly, thereby driving the mandrel assembly to move in a second direction. More specifically, the moving component 24 includes a pivot end pivotally connected to the cutting drive component 21, and a first end and a second end extending outward from the pivot end. When the cutting drive component 21 moves in the first direction, the first end moves under the action of the motion guide 22 to engage with the mandrel assembly; when the cutting drive component 21 drives the moving component 24 and thus drives the mandrel assembly to move in the second direction, the second end moves under the action of the motion guide 22 to separate the first end from the mandrel assembly. The mutual cooperation between the moving component 24 and the motion guide 22 of the conversion assembly allows the mandrel assembly to return to its initial position. The overall structure of the conversion assembly is simple and compact, and has high reliability.

[0127] The motion guide 22 includes a recess and guide surfaces located on both sides of the recess. The guide surfaces include a first guide surface and a second guide surface. A first end moves around a pivot end to engage with the spindle assembly by sliding contact with the first guide surface, and a second end moves around a pivot end by sliding contact with the second guide surface to separate the first end from the spindle assembly. In this embodiment, the first guide surface includes a first inclined surface 221 and a plane 223, and the second guide surface includes a second inclined surface 222. The first inclined surface 221, the second inclined surface 222, and the plane 223 all face the motion member 24. It is understood that the first guide surface and the second guide surface can also be other forms such as curved surfaces. The spindle assembly includes a spindle 201 and a connector 23 connected to the proximal end of the spindle 201. The first end is provided with an insertion portion 241, and the connector 23 is provided with a mating groove. The insertion portion 241 is inserted into the mating groove to engage the motion member 24 and the spindle assembly, or disengages from the mating groove to separate the motion member and the spindle assembly.

[0128] The motion guide 22 also includes a cutout located below the recess and / or guide surface. In this embodiment, the cutout is a slot located below the recess and guide surface, with the opening facing the proximal end face of the motion guide 22. The slot provides elasticity to the motion guide 22. It is understood that the slot may only be located below the guide surface, and the cutout may also be a groove located below the recess and / or guide surface, similarly providing elasticity to the motion guide 22. In other embodiments, the second inclined surface 222 of the motion guide 22 itself is elastic or includes, for example, an elastic portion of a spring. The elasticity of the motion guide 22 allows it to be compressed when the moving member 24 moves backward with the cutting drive member 21, preventing the moving member 24 from jamming.

[0129] The pivot end of the moving part 24 is pivotally connected to the front end of the cutting drive 21 via a pin 25. The moving part 24 is provided with an insert 241. When the cutting drive 21 retracts backward, the front end face 242 of the insert 241 can abut against the side wall of the engagement groove 211, thereby driving the connecting part 23 to move backward together.

[0130] The connector 23 is provided with a mating groove 211, and the moving member 24 can be partially embedded in the mating groove 211, thereby allowing the connector 23 to move together with the moving member 24 and the cutting drive member 21 in the front-back direction. The connector 23 is provided with a contact surface 231 and a third inclined surface 232. In the left-right direction of the electric stapler, the two contact surfaces 231 can clamp one of the third inclined surfaces 232. The third inclined surface 232 extends to the opening position of the mating groove 211. The third inclined surface 232 can guide the embedded part 241 to move to the opening position of the mating groove 211.

[0131] pass Figures 1 to 5 and Figures 21a to 21eThis describes the working state of the second transmission structure 2 during the process of the electric stapler cutting and suturing tissue.

[0132] like Figure 21a and Figure 21b As shown, in the initial state, the jaw assembly is open, the cutting blade assembly is at the proximal end, and the contact surface 231 of the cutting drive 21 and the connector 23 is spaced apart. The cutting drive 21 does not push the connector 23, and the connector 23 remains stationary. The moving member 24 slides along the third inclined plane 232, causing the moving member 24 to move around the pin 25 along... Figure 21a Rotating counterclockwise, the third inclined surface 232 guides the insert 241 to the opening position of the engagement groove 211.

[0133] like Figure 21c As shown, the cutting drive 21 continues to move forward, and the first end of the moving part 24 touches the first inclined surface 221, causing the moving part 24 to move along... Figure 21c When rotated clockwise, the insert 241 engages with the engagement groove 211, and the front end of the cutting drive 21 contacts the contact surface 231. The cutting drive 21 can push the connector 23 forward together, pushing the cutting blade assembly to perform a firing action. As the connector 23 continues to move forward, the bottom surface of the moving member 24 remains in contact with the plane 223.

[0134] like Figure 21d As shown, after the firing action ends, the retraction action begins. The motor gear 11 rotates in the opposite direction, driving the cutting drive 21 to move backward. The insert 241 abuts against the side wall of the engagement groove 211 and hooks the connector 23, allowing the connector 23 to move backward with the cutting drive 21.

[0135] like Figure 21e As shown, as the cutting drive 21 moves backward, after the second end of the moving part 24 contacts the second inclined surface 222, the moving part 24 moves along the second inclined surface 222 under the action of the second inclined surface 222. Figure 21e The insert 241 is disengaged from the engagement groove 211 by rotating counterclockwise. After the insert 241 is disengaged from the engagement groove 211, the connector 23 no longer moves backward with the cutting drive 21, and the cutting blade assembly no longer moves backward. At this point, the blade retraction action has been completed.

[0136] The motor gear 11 drives the cutting drive component 21 to continue moving backward. The moving component 24, under the elastic action of the motion guide 22 and the action of the third inclined plane 232, moves along... Figure 21e Rotate clockwise to return to the starting position. Figure 21a The initial state is shown.

[0137] The electric surgical instruments described in this application can simultaneously perform anastomosis and cutting. These instruments include end effectors, jaw drive mechanisms, cutting drive mechanisms, and power modules. Electric surgical instruments include, but are not limited to, electric staplers, suturing devices, and surgical robots. Although this application uses an electric stapler as an example to specifically describe electric surgical instruments, the electric surgical instruments described in this application are not limited to electric staplers.

[0138] It is understood that although the jaw drive mechanism and the cutting drive mechanism have been described above, the jaw drive mechanism and the cutting drive mechanism of this application do not necessarily need to appear simultaneously. For example, the jaw drive mechanism can be used in combination with any suitable existing cutting drive mechanism to achieve various functions of the stapler, and similarly, the cutting drive mechanism can also be used in combination with any suitable existing jaw drive mechanism to achieve various functions of the stapler.

[0139] Although the present application has been described in detail using the above embodiments, it will be apparent to those skilled in the art that the present application is not limited to the embodiments described herein. The present application can be modified and implemented as alternative embodiments without departing from the spirit and scope of the present application as defined by the claims. Therefore, the description in this specification is for illustrative purposes only and does not have any limiting meaning for the present application.

Claims

1. An electric surgical instrument comprising a jaw assembly, a sleeve, a cutting knife assembly, a mandrel assembly connected with the cutting knife assembly, a transmission mechanism, and a power module; the sleeve is connected to a proximal end of the jaw assembly; the power module is configured to provide power for the transmission mechanism; the transmission mechanism comprises a jaw driving mechanism and a cutting driving mechanism, the jaw driving mechanism drives the sleeve to move, thereby driving the jaw assembly to open or close; the cutting driving mechanism drives the mandrel assembly to move, thereby driving the cutting knife assembly to advance or retreat; the transmission mechanism has a first state and a second state; characterized in that the cutting driving mechanism comprises a cutting driving member, in the first state, the cutting driving member is separated from the mandrel assembly; in the second state, the cutting driving member engages with the mandrel assembly to drive the mandrel assembly to move, thereby driving the cutting knife assembly to advance or retreat; the cutting driving mechanism further comprises a conversion assembly, in the second state, the conversion assembly is driven by the cutting driving member to drive the mandrel assembly to move in a second direction to drive the cutting knife assembly to retreat; the conversion assembly comprises a moving member and a moving guide, the moving member is connected with the mandrel assembly, under the action of the cutting driving member, the moving member is guided by the moving guide to move to engage with the cutting driving member, thereby driving the mandrel assembly to move in the second direction; alternatively, the moving member is connected with the cutting driving member, under the action of the cutting driving member, the moving member is guided by the moving guide to move to engage with the mandrel assembly, thereby driving the mandrel assembly to move in the second direction.

2. The motorized surgical implement of claim 1, wherein, the power module comprises a motor and a motor gear, the cutting driving member is a rack, and the motor gear is engaged with the rack.

3. The motorized surgical implement of claim 1, wherein, the power module comprises a motor, the jaw driving mechanism and the cutting driving mechanism are driven by the same motor, and an axis of the motor extends in a front-rear direction of the electric surgical instrument.

4. The motorized surgical implement of claim 1, wherein, in the first state, a distal end of the cutting driving member is spaced apart from a proximal end of the mandrel assembly; in the second state, the distal end of the cutting driving member is fitted with the proximal end of the mandrel assembly to drive the mandrel assembly to move in a first direction, thereby driving the cutting knife assembly to advance, and the first direction is opposite to the second direction.

5. The motorized surgical implement of claim 4, wherein, the moving member comprises a pivoting end pivotally connected with the mandrel assembly, and a first end and a second end extending outwardly from the pivoting end; when the cutting driving member drives the mandrel assembly to move in the first direction, the first end is moved by the moving guide to engage with the cutting driving member; when the cutting driving member drives the moving member to drive the mandrel assembly to move in the second direction, the second end is moved by the moving guide to separate the first end from the cutting driving member.

6. The motorized surgical implement of claim 5, wherein, The core shaft assembly comprises a core shaft and a connecting piece connected with the proximal end of the core shaft, and the pivot end is pivotally connected with the connecting piece; the first end is provided with an embedding part, and the distal end of the cutting driving piece is provided with a combination groove, and the embedding part is embedded in the combination groove to make the moving piece and the cutting driving piece engage.

7. The motorized surgical implement of claim 6, wherein, The front end surface of the embedding part comprises a slope or an arc surface, and the turning radius of the free end of the embedding part entering the part of the combination groove first is less than or equal to the turning radius of the part entering the combination groove later.

8. The motorized surgical implement of claim 5, wherein, The movement guide comprises a recess and guide surfaces on both sides of the recess, and the guide surfaces comprise a first guide surface and a second guide surface; the first end moves around the pivot end to engage with the cutting driving piece by slidingly contacting with the first guide surface, and the second end moves around the pivot end to separate the first end from the cutting driving piece by slidingly contacting with the second guide surface.

9. The motorized surgical implement of claim 8, wherein, The first guide surface is located on the front side of the second guide surface.

10. The motorized surgical implement of claim 1, wherein, The movement guide is fixedly connected with or formed integrally with the housing of the electric surgical instrument.

11. The motorized surgical implement of claim 4, wherein, The moving piece comprises a pivot end pivotally connected with the cutting driving piece, and a first end and a second end extending outward from the pivot end; when the cutting driving piece moves in the first direction, the first end is moved to engage with the core shaft assembly by the action of the movement guide; When the cutting driving piece drives the moving piece to drive the core shaft assembly to move in the second direction, the second end is moved to separate the first end from the core shaft assembly by the action of the movement guide.

12. The motorized surgical implement of claim 11, wherein, The core shaft assembly comprises a core shaft and a connecting piece connected with the proximal end of the core shaft; the first end is provided with an embedding part, and the connecting piece is provided with a combination groove, and the embedding part is embedded in the combination groove to make the moving piece and the core shaft assembly engage, or is separated from the combination groove to make the moving piece and the core shaft assembly separate.

13. The motorized surgical implement of claim 11, wherein, The movement guide comprises a recess and guide surfaces on both sides of the recess, and the guide surfaces comprise a first guide surface and a second guide surface; the first end moves around the pivot end to engage with the core shaft assembly by slidingly contacting with the first guide surface, and the second end moves around the pivot end to separate the first end from the core shaft assembly by slidingly contacting with the second guide surface.

14. The motorized surgical implement of claim 13, wherein, The movement guide further comprises a hollow part, and the hollow part is located below the recess and / or the guide surface.

15. The motorized surgical implement of claim 1, wherein, The jaw driving mechanism comprises a jaw driving piece and a movement conversion piece rotatably connected with the jaw driving piece, and the jaw driving piece and the sleeve are connected through the movement conversion piece; the movement conversion piece drives the sleeve to move, so as to drive the jaw assembly to open or close; the jaw driving piece, the movement conversion piece and the sleeve constitute a crank slider mechanism; In the second state, the jaw driving piece is coupled with the power module, and the jaw driving piece and the movement conversion piece are located at the dead point position of the crank slider mechanism.

16. The motorized surgical implement of claim 15, wherein, The electric surgical instrument further comprises a blocking part for limiting the motion conversion part at the dead point position.

17. The motorized surgical implement of claim 1, wherein, The jaw driving mechanism comprises a jaw driving part and a motion conversion part rotatably connected to the jaw driving part, the jaw driving part and the sleeve are connected through the motion conversion part, the motion conversion part drives the sleeve to move, thereby driving the jaw assembly to open or close; the jaw driving part, the motion conversion part and the sleeve constitute a crank slider mechanism; In the second state, the jaw driving part is coupled with the power module, and the jaw driving part and the motion conversion part pass through the dead point position of the crank slider mechanism; the electric surgical instrument further comprises a blocking part for blocking the motion conversion part after it passes through the dead point position.

18. The motorized surgical implement of claim 15 or 17, wherein, The motion conversion part comprises a connecting rod, one end of the connecting rod is rotatably connected to the jaw driving part, and the other end of the connecting rod is rotatably connected to the sleeve.

19. The motorized surgical implement of claim 15 or 17, wherein, The motion conversion part comprises a connecting rod and a slider, one end of the connecting rod is rotatably connected to the jaw driving part, the other end of the connecting rod is rotatably connected to the slider, and the slider is fixedly connected to the sleeve.

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