A circular stapler

Abstract

The present invention provides a circular stapler, comprising a handle assembly, an elongated mechanism, and a stapler head assembly. The handle assembly includes a clamping mechanism, a firing mechanism, and a locking mechanism. The clamping mechanism includes a shaft and a transmission member. The firing mechanism includes a cam, a cam follower, and a driver. The locking mechanism includes a bracket and an unlocking button. When the shaft is in an initial position, the locking portion of the bracket blocks the unlocking button. When the shaft is in a clamping position, the locking portion of the bracket avoids the unlocking button and allows the unlocking button to slide between locked and unlocked positions. When the unlocking button is in the locked position, the driver cannot be activated. When the unlocking button is in the unlocked position, the driver can be activated to drive the cam follower to move. The reset driver of the cam follower can act on the unlocking button and drive it to reset. The stapler can prevent the stapler head assembly from being fired before clamping tissue, and the unlocking button can automatically reset after the firing mechanism is fired.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a circular stapler. Background Art

[0002] Circular staplers are used to perform end-to-end anastomosis.

[0003] Traditional circular staplers consist of an elongated shaft, a stapling head assembly located at the distal end of the shaft, and a handle assembly located at the proximal end of the shaft. Operating a circular stapler requires actuating the handle assembly to first retract the anvil in the stapling head assembly relative to the staple cartridge to clamp the tissue, and then actuate one or more actuators to staple and cut the tissue. Activating the brake assembly before the stapling head assembly clamps the tissue can result in tissue cuts or ineffective stapling, potentially leading to medical accidents. Therefore, a stapling head assembly that is not clamping tissue must be locked or identified to prevent accidental actuation of the actuator assembly. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a circular anastomosis device with a locking mechanism.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A circular stapler, comprising a handle assembly, an elongated mechanism extending from the handle assembly, and a stapling head assembly mounted at the distal end of the elongated mechanism, wherein the stapling head assembly comprises an anvil and a staple cartridge having an annular array of staples, the handle assembly comprises a housing, and a clamping mechanism, a firing mechanism, and a locking mechanism housed within the housing.

[0007] The clamping mechanism includes a shaft connected to the elongated structure and a transmission member connected to the shaft. In response to the transmission member, the shaft can move along its axial direction between an initial position and a clamping position, so that the anvil and the staple cartridge cooperate to clamp or release the tissue.

[0008] The firing mechanism includes a cam, a cam follower, and a driving member. The cam is configured to rotate in a first direction in response to activation of the driving member, thereby driving the cam follower to move between a first position and a firing position. When the cam follower moves from the first position to the firing position, the cam follower drives the elongated mechanism to actuate the stapling head assembly, causing the staples in the staple array to penetrate the tissue. The cam follower is provided with a reset driving portion.

[0009] The locking mechanism includes a bracket and an unlocking button. The bracket is mounted on the shaft and can move in response to the movement of the shaft. The bracket is provided with a locking portion. The unlocking button can slide along a first direction under force.

[0010] When the shaft is in the initial position, the locking portion of the bracket blocks the unlock button, preventing it from sliding. When the shaft is in the clamping position, the locking portion of the bracket avoids the unlock button, allowing the unlock button to slide between the locked position and the unlocked position under force.

[0011] When the unlock button is in the locked position, the drive member cannot be started. When the unlock button is in the unlock position, the drive member can be started and drive the cam follower to move. When the cam follower moves from the first position to the firing position, the reset drive part of the cam follower acts on the unlock button and drives the unlock button to move from the unlock position to the locked position.

[0012] Preferably, the unlocking button is provided with a reset groove, and the reset groove has a guide slope extending downward from the outside to the inside. During the movement of the cam follower from the first position to the firing position, the reset drive part can abut against the guide slope, thereby driving the unlocking button to slide.

[0013] Further preferably, the reset groove has an accommodating section located below the guide slope, and when the cam follower is located at the firing position, the reset drive portion is located in the accommodating section and limits the movement of the unlocking button.

[0014] Preferably, the unlocking button is provided with a locking groove matching the locking portion, and when the shaft is in the initial position, the locking portion is inserted into the locking groove; when the shaft is in the clamping position, the locking portion is away from the locking groove.

[0015] Preferably, the unlocking button is extended along the first direction.

[0016] Preferably, an outer end portion of at least one side of the unlocking button is exposed outside the housing.

[0017] Preferably, the locking mechanism also includes a bracket fixedly installed in the shell, the bracket has a plurality of limiting grooves arranged along the first direction, the unlocking button has an elastic protrusion matching the limiting grooves, and when the unlocking button is in the unlocking position or the locking position, the elastic protrusion is respectively located in the two limiting grooves of the bracket.

[0018] Preferably, the handle assembly further includes an unlocking switch and a firing switch.

[0019] In some embodiments, the unlocking switch is installed in the housing. When the unlocking button is in the unlocking position, the unlocking switch is sensed and closed; otherwise, the unlocking switch is opened.

[0020] Further preferably, the unlocking switch is a magnet induction switch.

[0021] In some embodiments, the firing switch is mounted on the housing. When the unlocking switch is closed, the firing switch is triggered, and the firing switch closes and starts the driving member. When the unlocking switch is disconnected, the firing switch is triggered, and the firing switch cannot start the driving member.

[0022] Preferably, the clamping mechanism further includes an indicator member, which is configured to rotate in response to the movement of the shaft, and the indicator member has a hook portion, and the shell corresponding to the hook portion has a visual window for showing the position of the hook portion, thereby indicating the position of the shaft.

[0023] Preferably, the handle assembly also includes a control system, a first sensor and a second sensor. When the cam follower is in the first position, the first sensor is triggered by the cam follower to send a first signal to the control system. After receiving the first signal, the control system controls the driving member to rotate in a first direction, so that the cam follower has a tendency to move toward the firing position; when the cam follower is in the firing position, the second sensor is triggered by the cam follower to send a second signal to the control system. After receiving the second signal, the control system controls the driving member to rotate in the opposite direction, so that the cam follower has a tendency to move toward the first position.

[0024] Further preferably, the cam follower has a triggering portion, and when the cam follower is located at the first position, the triggering portion triggers the first sensor; when the cam follower is located at the firing position, the triggering portion triggers the second sensor.

[0025] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0026] The present invention can prevent the anastomosis head assembly from being fired before clamping the tissue by providing a locking mechanism, thereby avoiding the occurrence of medical accidents. The locking mechanism has a simple structure and can automatically reset after the firing mechanism is fired, without the need for manual operation, which is very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the structure of the circular stapler of Example 1 (housing not shown);

[0028] Figure 2 1 is an exploded view of the circular stapler of Example 1 (housing not shown);

[0029] Figure 3Schematic diagram of the structure of the circular stapler of Example 1 in an unclamped state (not all components are shown);

[0030] Figure 4 Schematic diagram of the structure of the circular stapler in Example 1 in a clamping state (not all components are shown);

[0031] Figure 5 This is a schematic structural diagram of the clamping mechanism of Example 1;

[0032] Figure 6 for Figure 5 Sectional view on plane AA;

[0033] Figure 7 Schematic diagram of the structure of the handle assembly of Example 1 (the housing and clamping mechanism are not shown);

[0034] Figure 8 This is a structural schematic diagram of the circular stapler of Example 1 from another angle;

[0035] Figure 9 for Figure 8 An enlarged schematic diagram of portion I, wherein the shaft is in an initial position, the unlock button is in a locked position, and the cam follower is in a first position;

[0036] Figure 10 for Figure 8 An enlarged schematic diagram of portion I, wherein the shaft is in a clamped position, the unlock button is in a locked position, and the cam follower is in a first position;

[0037] Figure 11 for Figure 8 An enlarged schematic diagram of portion I, wherein the shaft is in the clamped position, the unlock button is in the unlocked position, and the cam follower is in the first position;

[0038] Figure 12 for Figure 8 An enlarged schematic diagram of section I, wherein the shaft is in the clamped position, the unlock button is in the unlocked position, and the cam follower is in the fired position;

[0039] Figure 13 for Figure 8 An enlarged schematic diagram of portion I, wherein the shaft is in an initial position, the unlock button is in a locked position, and the cam follower is in a first position;

[0040] Figure 14 This is a schematic diagram of the structure of the unlock button in Example 1;

[0041] Figure 15 This is a schematic structural diagram of the rotating component of Example 1;

[0042] Figure 16This is a schematic structural diagram of the bracket of Example 1;

[0043] Figure 17 This is a schematic diagram of the cooperation between the bracket and the unlocking button in Example 1, wherein the bracket blocks the unlocking button;

[0044] Figure 18 This is a schematic diagram of the cooperation between the bracket and the unlocking button in Example 1, wherein the bracket avoids the unlocking button;

[0045] Figure 19 This is a schematic diagram of the unlock button and the bracket in accordance with Example 1, wherein the unlock button is in the locked position;

[0046] Figure 20 This is a schematic diagram of the unlock button and the bracket in accordance with Example 1, wherein the unlock button is in the unlock position;

[0047] Figure 21 This is a schematic diagram of the cooperation between the unlocking button and the rotating member in Example 1;

[0048] Figure 22 This is another schematic diagram of the cooperation between the unlocking button and the rotating member in Example 1;

[0049] Among them, 1. handle assembly; 11. shaft; 111. first spiral groove; 112. second spiral groove; 113. stopper; 12. transmission member; 121. transmission body; 122. pin; 13. cam; 14. cam follower; 141. rotating member; 1411. reset drive unit; 1412. trigger unit; 1413. tooth groove; 142. firing member; 15. drive member; 151. drive screw; 1 52. Battery; 153. Trigger switch; 16. Bracket; 161. Limiting groove; 17. Unlocking button; 171. Locking groove; 172. Reset groove; 1721. Guide slope; 1722. Accommodating section; 173. Hall switch; 175. Elastic protrusion; 18. Bracket; 181. Locking portion; 182. Driving portion; 19. Indicator; 191. Hook portion; 192. Abutting portion; 110. Elastic member;

[0050] 2. Slender structure;

[0051] 3. Anastomotic head assembly; 31. Anvil; 32. Staple cartridge;

[0052] 41. First sensor; 42. Second sensor;

[0053] x, first direction; y, second direction. DETAILED DESCRIPTION

[0054] The present invention is further described below with reference to the following examples. However, the present invention is not limited to the following examples. The implementation conditions used in the examples may be further adjusted according to the specific requirements of the application. Unspecified implementation conditions are conventional conditions in the industry. The technical features involved in the various embodiments of the present invention may be combined with each other as long as they do not conflict with each other.

[0055] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and description are to be regarded as illustrative in nature and not restrictive.

[0056] In the description of the present invention, it should be understood that the distal end refers to the end of the instrument or component away from the operator, and the proximal end refers to the end of the instrument or component close to the operator; the axial direction refers to the direction parallel to the line connecting the centers of the distal and proximal ends of the instrument or component; the inside and the outside are positions defined by the distance relative to the center of the instrument or component, where the inside is the position close to the center of the instrument or component, and the outside is the position away from the center of the instrument or component; the upper and the lower refer to the orientation of the instrument in actual use or working state. The description of the above-mentioned directional words is only for the convenience of describing the embodiments of the present invention and simplifying the description, and does not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention.

[0057] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0058] The disclosure below provides many different embodiments or examples for implementing different structures of the embodiments of the present invention. In order to simplify the disclosure of the embodiments of the present invention, the components and configurations of specific examples are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. In addition, the embodiments of the present invention may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or configurations discussed.

[0059] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0060] Example 1

[0061] A circular stapler, such as Figure 1 and Figure 2 As shown, it includes a handle assembly 1, a slender mechanism 2 and a stapling head assembly 3.

[0062] The anastomosis head assembly 3 includes an anvil 31 and a nail magazine 32. The anvil 31 has a circular nail anvil surface and a connecting rod. The connecting rod is connected to the slender mechanism 2. It can move toward the proximal end under the drive of the slender mechanism 2 and cooperate with the nail magazine 32 to clamp the tissue or move toward the distal end to loosen the clamping of the tissue. The nail magazine 32 is connected to the slender mechanism 2 and has a ring-shaped nail array (not shown in the figure). Under the actuation of the slender mechanism 2, the nails in the nail array can be pushed out and pass through the tissue. With the cooperation of the nail anvil surface on the anvil 31, the nails are deformed from a "U" shape to a "B" shape, thereby suturing the tissue. A blade is optionally provided on the nail magazine 32 to cut the tissue. The anastomosis head assembly 3 can also refer to the anastomosis head assembly 3 in the prior art, and the present invention is not limited thereto.

[0063] The elongated mechanism 2 is connected between the handle assembly 1 and the stapling head assembly 3. In response to actuation of the handle assembly 3, the elongated mechanism 2 is configured to drive the anvil 31 to move relative to the staple cartridge 32, thereby switching between a clamped state and an unclamped state. The elongated mechanism 2 can also push staples from the staple cartridge 32 to suturing tissue. The elongated mechanism 2 can be straight or have a preformed curved portion. The specific shape and structure can refer to the prior art and are not limited by the present invention.

[0064] The handle assembly 1 includes a housing (not shown) and a clamping mechanism, a firing mechanism, and a locking mechanism accommodated in the housing.

[0065] See also Figures 3 to 6 The clamping mechanism includes a shaft 11 connected to the elongated mechanism 2 and a transmission member 12 connected to the shaft 11. In response to the transmission member 12, the shaft 11 can move along its axial direction between the initial position and the clamping position, so that the anvil 31 and the nail magazine 32 cooperate to clamp the tissue (see Figure 3 ) or loosen the clamping of the tissue (see Figure 4 ).

[0066] Specifically, the transmission member 12 is rotatably provided on the shaft 11 around the axial direction of the shaft 11. When the transmission member 12 is rotated, the shaft 11 moves toward the proximal end along its axial direction and causes the slender mechanism 2 to move with the anvil 31 toward the direction close to the nail magazine 32, thereby cooperating with the nail magazine 32 to clamp the tissue; when the transmission member 12 is rotated in the opposite direction, the shaft 11 moves toward the distal end along its axial direction and causes the slender mechanism 2 to move with the anvil 31 toward the direction away from the nail magazine 32, thereby releasing the clamping of the tissue.

[0067] Further, see Figure 5 and Figure 6The proximal periphery of the shaft 11 is provided with a first spiral groove 111 and a second spiral groove 112 in sequence from far to near. The groove pitch between the first spiral grooves 111 is smaller than the groove pitch between the second spiral grooves 112. The setting of the first spiral groove 111 facilitates fine-tuning of the travel distance of the shaft 11. The transmission member 12 includes a transmission body 121 and a pin 122 fixedly connected to the distal end of the transmission body 121. The transmission body 121 is rotatably mounted on the shaft 11. The pin 122 partially passes through the transmission body 121 and extends into the spiral groove of the shaft 11. When the transmission body 121 rotates, the pin 122 moves in the spiral groove of the shaft 11 and drives the shaft 11 to move. Compared with the traditional threaded connection method, the setting of the pin 122 is more stable. The proximal end of the transmission body 121 is provided with multiple protrusions for easy gripping by the operator.

[0068] To indicate the position of the shaft 11, the clamping mechanism further includes an indicator member 19, which is configured to rotate in response to the movement of the shaft 11, thereby indicating the position of the shaft 11. Specifically, the indicator member 19 has a hook portion 191, and the housing corresponding to the hook portion 191 has a visual window (not shown in the figure) for indicating the rotational position of the hook portion 191.

[0069] See also Figures 7 to 13 The firing mechanism includes a cam 13, a cam follower 14, and a driver 15. The cam 13 is configured to rotate about a first direction x in response to activation of the driver 15, thereby driving the cam follower 14 to move between a first position and a firing position. When the cam follower 14 moves from the first position to the firing position, the cam follower 14 drives the elongated mechanism 2 to actuate the stapling head assembly 3, causing the staples in the staple array to penetrate the tissue.

[0070] Specifically, the cam 13 is a gear (the teeth are shown in the figure), and the driving member 15 is a motor. The motor has a drive screw 151 that meshes with the gear. When the motor is started, the drive screw 151 rotates in the second direction y, thereby driving the cam 13 to rotate in the first direction x. The cam follower 14 includes a rotating member 141 and a firing member 142. One end of the rotating member 141 has a tooth groove 1413 that meshes with the cam 13, and the other end is connected to the firing member 142. Driven by the cam 13, the rotating member 141 can rotate in the first direction x and move the firing member 142 between the first position and the firing position.

[0071] Furthermore, a trigger portion 1412 is provided at the upper end of the rotating member 141, which cooperates with the position sensor to indicate whether the stapling head assembly 3 has been fired. Specifically, the handle assembly 1 also includes a control system, a first sensor 41, and a second sensor 42. When the cam follower 14 is in the first position, the trigger portion 1412 triggers the first sensor 41, and the first sensor 41 sends a first signal to the control system. After the control system receives the first signal, it controls the driver 15 to rotate in a first direction after being activated, so that the cam follower 14 has a tendency to move toward the firing position; when the cam follower 14 is in the firing position, the trigger portion 1412 triggers the second sensor 42. The second sensor 42 is triggered by the cam follower 14 and sends a second signal to the control system. After the control system receives the second signal, it controls the driver 15 to rotate in the opposite direction after being activated, so that the cam follower 14 has a tendency to move toward the first position.

[0072] The locking mechanism includes a bracket 18 and an unlocking button 17. The bracket 18 is mounted on the shaft 11 and can move in response to the movement of the shaft 11. Figure 17 and 18 As shown, the bracket 18 has a locking portion 181 and a driving portion 182. The locking portion 181 is used to cooperate with the unlocking button 17 to lock the unlocking button 17; the driving portion 182 is used to cooperate with the indicator 19 to drive the indicator 19 to rotate. Specifically, the driving portion 182 can abut against the abutment portion 192 on the indicator 19, thereby driving the indicator 19 to rotate. The unlocking button 17 can slide along the first direction x under force. When the shaft 11 is in the initial position, the locking portion 181 of the bracket 18 blocks the unlocking button 17, preventing it from sliding. When the shaft 11 is in the clamping position, the locking portion 181 of the bracket 18 avoids the unlocking button 17, allowing the unlocking button 17 to slide between the locked position and the unlocked position under force.

[0073] Specifically, the unlocking button 17 is provided with a locking groove 171 that matches the locking portion 181. When the shaft 11 is in the initial position, the locking portion 181 is inserted into the locking groove 171, thereby restricting the movement of the unlocking button 17, and the unlocking button 17 cannot slide along the first direction x, and it is in the locked position; when the shaft 11 is in the clamping position, the locking portion 181 is away from the locking groove 171, thereby avoiding the unlocking button 17. When the unlocking button 17 is pressed, the unlocking button 17 can slide along the first direction x to the unlocking position.

[0074] When the unlock button 17 is in the locked position, the driver 15 cannot be activated. When the unlock button 17 is in the unlocked position, the driver 15 can be activated to drive the cam follower 14. Specifically, the handle assembly 1 also includes an unlock switch and a trigger switch 153. The unlock switch is mounted below the unlock button 17. When the unlock button 17 is in the unlocked position, the unlock switch is closed by induction; otherwise, the unlock switch is open. The trigger switch 153 is mounted on the housing. When the unlock switch is closed, the trigger switch 153 is triggered, closing the trigger switch 153 and activating the driver 15. When the unlock switch is open, the trigger switch 153 is triggered, but even if the trigger switch 153 is closed, the driver 15 cannot be activated. In other words, only when the stapling head assembly 3 is clamping tissue can the unlock button 17 be pressed, moving it to the unlocked position, at which point the driver 15 can be activated. Preferably, the unlock switch, trigger switch 153, and driver 15 are connected in series to form a circuit. Furthermore, the unlock switch is a magnetic sensing switch, such as a Hall effect switch 173. There is no limitation on the trigger switch 153 , and specific details may be referred to the prior art.

[0075] In order to keep the unlocking button 17 in the unlocking position or the locking position, as shown in FIG. Figure 14 、 Figure 16 、 Figure 19 and Figure 20 As shown, the side of the unlock button 17 is further provided with an elastic protrusion 175. In conjunction with this, a bracket 16 is provided within the handle assembly 1. The bracket 16 has a plurality of limiting grooves 161 arranged along a first direction x. When the unlock button 17 is in the unlocked position or the locked position, the elastic protrusion 175 is respectively located in two limiting grooves 161 of the bracket 16. When the unlock button 17 is subjected to force, the elastic protrusion 175 can undergo elastic deformation and move from one limiting groove 161 to the other limiting groove 161. Specifically, the bracket 16 is fixedly connected to the housing, and the unlock button 17 is slidably provided on the bracket 16. At least one end of the unlock button 17 is exposed to the housing to facilitate pressing by the operator. The rotating member 141 is optionally rotatably connected to the bracket 16.

[0076] like Figure 14 As shown, the unlocking button 17 is further provided with a reset groove 172, and the reset groove 172 has a guide slope 1721 extending downward from the outside to the inside. Figure 15 As shown, the cam follower 14 has a reset driving portion 1411. When the cam follower 14 moves from the first position to the firing position, the reset driving portion 1411 can abut against the guide slope 1721 to drive the unlocking button 17 to slide (see Figure 21 and Figure 22Preferably, the reset groove 172 further includes a receiving section 1722 located below the guide ramp 1721. When the cam follower 14 is in the firing position, the reset driver 1411 is located in the receiving section 1722 and restricts the movement of the unlocking button 17. The reset driver 1411 is located on the rotating member 141 of the cam follower 14. The cooperation between the reset groove 172 and the reset driver 1411 allows the unlocking button 17 to be automatically reset after the stapling head assembly 3 is fired, which is very convenient.

[0077] Since the movement distance of the shaft 11 is relatively large, in order to limit the movement distance of the bracket 18, the locking mechanism of the present invention further includes a stopper 113 provided at the proximal end of the shaft 11 and an elastic member 110 sleeved on the shaft 11 and located proximal to the stopper 113. The proximal end of the bracket 18 is connected to the shaft 11 and located between the elastic member 110 and the stopper 113. When the shaft 11 moves toward the proximal end from the initial state, under the action of the elastic member 110, the bracket 18 does not move with the movement of the shaft 11. After moving a certain distance, the shaft 11 continues to move toward the proximal end. Due to the stopping effect of the stopper 113, the bracket 18 moves with the movement of the shaft 11 under the drive of the stopper 113. At this time, the elastic member 110 is compressed. Preferably, the elastic member 110 is a spring.

[0078] In this embodiment, the handle assembly 1 further includes a battery 152 for supplying power to components such as the driving member 15 .

[0079] Working principle:

[0080] The tissue to be stapled is placed between the anvil 31 and the staple magazine 32, and the transmission member 12 is rotated to move the shaft 11 along its axial direction toward the proximal end and actuate the slender mechanism 2, so that the anvil 31 moves toward the direction close to the staple magazine 32, thereby clamping the tissue. In response to the movement of the shaft 11, the bracket 18 moves toward the proximal end, and the driving part 182 thereon drives the indicator 19 to rotate. The operator sees the position of the hook part 191 of the indicator 19 through the visual window, thereby judging whether the shaft 11 has moved from the initial position to the clamping position. When it is judged that the shaft 11 is in the clamping position, the rotation of the transmission member 12 is stopped, and the anastomosis head assembly 3 is in the clamping state. At this time, the locking portion 181 on the bracket 18 is away from the locking groove 171 of the unlocking button 17 and avoids the unlocking button 17. The operator presses the unlocking button 17, and the unlocking button 17 slides inward along the first direction x. The elastic protrusion 175 of the unlocking button 17 undergoes elastic deformation and moves from one limiting groove 161 of the bracket 16 to another limiting groove 161 located inside the limiting groove 161. The unlocking switch is closed or a signal is sent to the control system.

[0081] Next, the firing switch 153 is pressed, the driving member 15 starts and drives the cam 13 to rotate around the first direction x. Driven by the cam 13, the cam follower 14 moves from the first position to the firing position. At this time, the stapling head assembly 3 is fired, and the nail is pushed out from the nail magazine 32 and stapled to the tissue. The reset driving part 1411 of the cam follower 14 acts on the reset groove 172 of the unlocking button 17, so that the unlocking button 17 is automatically reset, that is, it moves from the unlocking position to the locking position, and the triggering part 1412 of the cam follower 14 moves from the position of the first sensor 41 to the position of the second sensor 42 and triggers the second sensor 42 to send a second signal to the control system. After receiving the second signal, the control system controls the driving member 15 to rotate in the opposite direction after starting.

[0082] Then, the firing switch 153 is pressed again, the driving member 15 rotates in the opposite direction and drives the cam 13 to move with the cam follower 14, the cam follower 14 moves from the firing position to the first position, and the transmission member 12 is rotated in the opposite direction, so that the shaft 11 moves along its axial direction toward the distal end, thereby releasing the clamping of the anastomosis head assembly 3 on the tissue.

[0083] The above detailed description of the present invention is intended to enable persons familiar with the art to understand the contents of the present invention and implement them. It does not limit the scope of protection of the present invention. Any equivalent changes or modifications made based on the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A circular stapler comprising a handle assembly (1), an elongated structure (2) extending from the handle assembly (1), and a stapling head assembly (3) mounted at the distal end of the elongated structure (2), the stapling head assembly (3) comprising an anvil (31) and a staple cartridge (32), the staple cartridge (32) having an annular array of staples, characterized in that: The handle assembly (1) comprises a housing and a clamping mechanism, a firing mechanism and a locking mechanism contained in the housing. The clamping mechanism comprises a shaft (11) connected to the elongated mechanism (2) and a transmission member (12) connected to the shaft (11). In response to the transmission member (12), the shaft (11) can move along its axial direction between an initial position and a clamping position, thereby enabling the anvil (31) and the nail magazine (32) to cooperate to clamp or release the tissue. The firing mechanism comprises a cam (13), a cam follower (14) and a driving member (15); the cam (13) is configured to rotate about a first direction (x) in response to activation of the driving member (15), thereby driving the cam follower (14) to move between a first position and a firing position; when the cam follower (14) moves from the first position to the firing position, the cam follower (14) drives the elongated mechanism (2) to actuate the stapling head assembly (1), so that the nails in the nail array pass through the tissue; a reset driving portion (1411) is provided on the cam follower (14); The locking mechanism comprises a bracket (18) and an unlocking button (17), wherein the bracket (18) is mounted on the shaft (11) and can move in response to the movement of the shaft (11), a locking portion (181) is provided on the bracket (18), and the unlocking button (17) can slide along a first direction (x) under a force. When the shaft (11) is in the initial position, the locking portion (181) of the bracket (18) blocks the unlocking button (17), hindering the unlocking button (17) from sliding. When the shaft (11) is in the clamping position, the locking portion (181) of the bracket (18) avoids the unlocking button (17), allowing the unlocking button (17) to slide between the locked position and the unlocked position under force. When the unlock button (17) is in the locked position, the driving member (15) cannot be started. When the unlock button (17) is in the unlock position, the driving member (15) can be started and drive the cam follower (14) to move. When the cam follower (14) moves from the first position to the firing position, the reset driving portion (1411) of the cam follower (14) acts on the unlock button (17) and drives the unlock button (17) to move from the unlock position to the locked position.

2. The circular stapler according to claim 1, characterized in that: The unlocking button (17) is provided with a reset groove (172), and the reset groove (172) has a guide inclined surface (1721) extending downward from the outside to the inside. When the cam follower (14) moves from the first position to the firing position, the reset driving part (1411) can abut against the guide inclined surface (1721), thereby driving the unlocking button (17) to slide.

3. The circular stapler according to claim 1, characterized in that: The unlocking button (17) is provided with a locking groove (171) matching the locking portion (181); when the shaft (11) is in the initial position, the locking portion (181) is inserted into the locking groove (171); when the shaft (11) is in the clamping position, the locking portion (181) is away from the locking groove (171).

4. The circular stapler according to claim 1, characterized in that: The unlocking button (17) is extended along a first direction (x).

5. The circular stapler according to claim 1, characterized in that: The locking mechanism further comprises a bracket (16) fixedly mounted in the housing, the bracket (16) having a plurality of limiting grooves (161) arranged along a first direction (x), the unlocking button (17) having an elastic protrusion (175) matching the limiting grooves (161), and when the unlocking button (17) is located in an unlocking position or a locking position, the elastic protrusion (175) is respectively located in the two limiting grooves (161) of the bracket (16).

6. The circular stapler according to claim 1, characterized in that: The handle assembly (1) further comprises an unlocking switch and a firing switch (153), wherein the unlocking switch is mounted in the housing and is closed by induction when the unlocking button (17) is in the unlocking position, otherwise the unlocking switch is opened; The firing switch (153) is mounted on the housing. When the unlocking switch is closed, the firing switch (153) is actuated, the firing switch (153) is closed and the driving member (15) is activated. When the unlocking switch is disconnected, the firing switch (153) is actuated, and the firing switch (153) cannot activate the driving member (15).

7. The circular stapler according to claim 6, characterized in that: The unlocking switch is a magnet induction switch.

8. The circular stapler according to claim 1, characterized in that: The clamping mechanism further includes an indicator (19), which is configured to rotate in response to the movement of the shaft (11). The indicator (19) has a hook portion (191), and a housing corresponding to the hook portion (191) has a visual window for showing the position of the hook portion (191), thereby indicating the position of the shaft (11).

9. The circular stapler according to claim 1, characterized in that: The handle assembly (1) further comprises a control system, a first sensor (41) and a second sensor (42); when the cam follower (14) is located at the first position, the first sensor (41) is triggered by the cam follower (14) to send a first signal to the control system; after receiving the first signal, the control system controls the driving member (15) to rotate about a first direction (x) so that the cam follower (14) has a tendency to move toward the firing position; when the cam follower (14) is located at the firing position, the second sensor (42) is triggered by the cam follower (14) to send a second signal to the control system; after receiving the second signal, the control system controls the driving member (15) to rotate in the opposite direction so that the cam follower (14) has a tendency to move toward the first position.

10. The circular stapler according to claim 9, characterized in that: The cam follower (14) has a triggering portion (1412). When the cam follower (14) is located at a first position, the triggering portion (1412) triggers the first sensor (41); when the cam follower (14) is located at a firing position, the triggering portion (1412) triggers the second sensor (42).

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