Handle with manual backout mechanism and stapler

Abstract

The application provides a handle and an anastomat. The handle comprises a housing, a driving assembly, a transmission assembly and a manual back-off mechanism. The transmission assembly comprises a rack and a transmission gear which can rotate around its axis and drive the rack to move forward or backward under the driving of the driving assembly. The manual back-off mechanism comprises a transmission gear lever, an elastic member, a locking member and a back-off assembly. The transmission gear lever is rotatably arranged in the housing and has a first end and a second end. The first end is connected to the transmission gear, so that when the transmission gear lever rotates, the transmission gear can be driven to move to a locked state connected to the rack and the driving assembly or to an unlocked state disconnected from the rack and / or the driving assembly. The locking member can overcome the elastic force of the elastic member and be transferred from the locked position to the unlocked position or from the unlocked position to the locked position under the implementation of rotational movement. The application is very labor-saving by moving the transmission gear along its radial direction to the unlocked state or the locked state.

Description

TECHNICAL FIELD

[0001] The present application relates to a handle with a manual back-off mechanism and an anastomat. BACKGROUND

[0002] The laparoscopic anastomat is a commonly used instrument in laparoscopic surgery, and the mainstream surgical consumable instrument manufacturers on the market all have corresponding instruments. The head end of the laparoscopic anastomat is a claspable and closable jaw, and after clamping the tissue, pulling the trigger handle can drive the cutting knife and the wedge-shaped push block forward, and at the same time, the anastomosis nails are pushed out upward and are anastomosed to the corresponding tissue.

[0003] During the use of the anastomat, various unexpected situations may occur to stop the operation of the instrument, such as battery power consumption, circuit board signal loss, electrode damage, etc. At this time, the cutting knife cannot be retracted and the jaw cannot be opened by pressing the key. At the same time, the motor is locked and cannot rotate due to its own characteristics, and the gear or rack meshing with the motor gear cannot move, so the instrument cannot be separated from the patient and cannot be taken out from the abdominal cavity, which may cause serious clinical consequences. Therefore, it is particularly necessary to design a safe and reliable manual back-off mechanism.

[0004] The technical solution adopted by most companies (such as Johnson & Johnson Company and most domestic manufacturers) at present is that the output gear of the motor is meshed with the rack through a transmission gear. When unlocking operation is needed, the transmission gear is pushed along the axial direction to make it disengage with the rack. However, this solution has the following shortcomings: when the front end of the instrument is stuck, the rack cannot move, and the strong output force of the motor causes a large extrusion force between the motor and the transmission gear, which increases the friction force. A large force is needed to push the transmission gear, and since the instrument is connected with the patient's tissue, it is difficult for the user to exert force in a comfortable posture, which further leads to the failure to unlock. In order to solve this problem, a complex cam lever mechanism needs to be designed to amplify the operating force, which is high in cost. At the same time, a complex mechanism needs to be designed to keep the transmission gear and the rack disengaged, so as to avoid the reuse of the faulty instrument. SUMMARY

[0005] The purpose of the present application is to provide a handle with a manual back-off mechanism which is labor-saving and simple in structure.

[0006] Another purpose of the present application is to provide an anastomat comprising the handle.

[0007] To achieve the above purpose, the technical solution adopted by the present application is as follows:

[0008] A handle with a manual back-off mechanism, comprising a housing, a driving assembly arranged in the housing, and a transmission assembly, the transmission assembly comprising a transmission gear and a rack extending in a front-rear direction, the transmission gear being operatively connected with the driving assembly and the rack and being capable of rotating about its axis in a forward direction or a reverse direction under the drive of the driving assembly and driving the rack to move forward or backward, the handle further comprising a manual back-off mechanism, the manual back-off mechanism comprising:

[0009] a transmission gear lever rotatably arranged in the housing, the transmission gear lever having a rotation axis parallel to the axis of the transmission gear, the transmission gear lever having a first end and a second end on both sides of the rotation axis, the first end being connected to the transmission gear, so that when the transmission gear lever rotates, the transmission gear lever can drive the transmission gear to move to a locked state connected with the rack and the driving assembly or to an unlocked state disconnected with the rack and / or the driving assembly;

[0010] a resilient member configured to make the transmission gear have a tendency to be connected with the rack and the driving assembly or to have a tendency to be disconnected with the rack and / or the driving assembly;

[0011] a locking member rotatably arranged in the housing, the locking member being capable of overcoming the elastic force of the resilient member and moving from a locked position to an unlocked position to make the transmission gear in the unlocked state or moving from the unlocked position to the locked position to make the transmission gear in the locked state under the implementation of rotational movement;

[0012] a back-off assembly connected to the rack, the back-off assembly being capable of driving the rack to move forward or backward when the transmission gear is in the unlocked state.

[0013] Preferably, the locking member is arranged between the rack and the second end, the locking member comprising a rotating body and an extension arranged on the rotating body and extending radially outwardly, the extension abutting against the second end when the locking member is in the locked position, and the extension not contacting the second end when the locking member is in the unlocked position.

[0014] Further, the handle further comprises a catch arranged in the housing and between the rack and the second end, the catch cooperating with the extension to keep the extension from contacting the second end when the locking member is in the unlocked position.

[0015] In some specific embodiments, the free end of the extension is outwardly arched and substantially arc-shaped, and the free end of the extension is provided with a clamping groove, and the hook portion of the clamping hook is inserted into the clamping groove when the locking member is in the unlocked position.

[0016] Preferably, the rotating body is provided with an inwardly recessed groove or an outwardly protruding protrusion, and the groove or protrusion is exposed in the shell to facilitate an operator to operate the rotating body using an operating wrench.

[0017] In some specific embodiments, the groove or protrusion of the rotating body is substantially "cross"-shaped.

[0018] Preferably, the locking member is adjacent to the side portion of the second end portion away from the first end portion.

[0019] Preferably, one end of the elastic member is fixedly arranged in the shell, and the other end is connected to the side portion of the second end portion away from the first end portion, and the elastic force of the elastic member causes the transmission gear lever to have a tendency to drive the transmission gear to be disconnected from the rack and / or the driving assembly.

[0020] In some specific embodiments, the elastic member is a tension spring.

[0021] Preferably, the reset assembly comprises a reset gear, and the reset gear is rotatably arranged in the shell about an axis of the reset gear and is engaged with the rack.

[0022] Further, the reset gear is located between the rack and the second end portion and is adjacent to the rotation axis of the transmission gear lever, and the axis of the reset gear is parallel to the axis of the transmission gear.

[0023] Further, the reset gear is provided with an inwardly recessed groove or an outwardly protruding protrusion, and the groove or protrusion of the reset gear is exposed in the shell to facilitate an operator to operate the reset gear using an operating wrench.

[0024] In some specific embodiments, the groove or protrusion of the reset gear is substantially "cross"-shaped.

[0025] Further, the reset gear comprises a gear body and an extension rod connected to the gear body and extending axially outwardly from the gear body, and the groove or protrusion of the reset gear is located on the extension rod.

[0026] Preferably, the first end portion is provided with a first accommodating groove for accommodating the transmission gear, and the transmission gear is rotatably arranged in the first accommodating groove.

[0027] Preferably, the second end portion has a second accommodating groove accommodating the locking member and the reset assembly, and the locking member and the reset assembly are partially or wholly located in the second accommodating groove, and the reset assembly does not interfere with the movement of the transmission gear lever.

[0028] Preferably, the handle further comprises an operating wrench detachably arranged in the housing, and the operating wrench is capable of cooperating with the locking member and the reset assembly respectively to operate the locking member and the reset assembly.

[0029] Preferably, the handle further comprises a rack fixedly arranged in the housing, and the transmission gear lever, the elastic member, the locking member and the reset assembly are arranged on the rack respectively.

[0030] Preferably, the housing has a hollow operating window located on the housing outside the locking member and the reset assembly, and a cover capable of being opened or closed is arranged on the operating window.

[0031] Preferably, the driving assembly comprises a motor having a motor gear capable of rotating in a positive direction or a reverse direction around its axis under the driving of the motor, the motor gear is located below the rack and its axis is parallel to the axis of the transmission gear, the transmission gear is located on the same side of the rack and the motor gear, the transmission gear is engaged with the motor gear and the rack respectively when the transmission gear is in the locked state, and the axis of the transmission gear extends in the up-down direction.

[0032] Another object of the present application is to provide an anastomat comprising a handle as described above and a working head connected to the handle. The structure of the working head is referred to the working head of the prior art anastomat.

[0033] By using the above technical scheme, the present application has the following advantages compared with the prior art:

[0034] The handle of the present application is designed by the transmission gear lever, the elastic member and the locking member, so that the transmission gear can move in the radial direction to the unlocked state or the locked state, thereby avoiding the huge friction caused by the lateral force when the transmission gear moves in the axial direction, and the handle is very labor-saving and convenient to operate. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 FIG. 1 is a structural schematic view of a handle in an embodiment of the present application (only a part of the housing is shown and the transmission gear is in the locked state);

[0036] Figure 2 FIG. 2 is a structural schematic view of a handle in an embodiment of the present application (only a part of the housing is shown and the transmission gear is in the unlocked state); Figure 1 FIG. 3 is a front view of the handle;

[0037] Figure 3 Fig. 1 is a perspective view of the handle according to the present application; Figure 2 Fig. 2 is a sectional view along A-A of Fig. 1;

[0038] Figure 4 Fig. 3 is an enlarged view of part B of Fig. 1; Figure 3

[0039] Figure 5 Fig. 4 is a structural exploded view of the handle according to the present application;

[0040] Figure 6 Fig. 5 is a front view of the handle according to the present application; Figure 5

[0041] Figure 7 Fig. 6 is a sectional view along C-C of Fig. 5; Figure 6

[0042] Figure 8 Fig. 7 is an enlarged view of part D of Fig. 5; Figure 7

[0043] Figure 9 Fig. 8 is a structural exploded view of the handle according to the present application;

[0044] Figure 10 Fig. 9 is a structural schematic view of the handle according to the present application (wherein the cover is in an open state);

[0045] Figure 11 Fig. 11 is a schematic view of the connection between the transmission assembly and the driving assembly according to the present application;

[0046] Figure 12 Fig. 12 is a structural schematic view of the transmission gear lever according to the present application;

[0047] Figure 13 Fig. 13 is a structural schematic view of the locking member according to the present application;

[0048] Figure 14 Fig. 14 is a structural schematic view of the back gear according to the present application;

[0049] Figure 15 Fig. 15 is a structural schematic view of the anastomat according to the present application;

[0050] Fig. 1 is a perspective view of the handle according to the present application; wherein 1 is a housing; 11 is a first shell; 12 is a second shell; and 13 is a cover;

[0051] Fig. 2 is a sectional view along A-A of Fig. 1; wherein 2 is a motor; and 21 is a motor gear;

[0052] Fig. 3 is a sectional view along B-B of Fig. 1; wherein 3 is a rack; and 31 is a tooth surface;

[0053] Fig. 4 is a structural exploded view of the handle according to the present application; wherein 4 is a transmission gear; ​​​​

[0054] 5, transmission gear lever; 51, first end portion; 511, first accommodating groove; 52, second end portion; 521, second accommodating groove; 522, proximal side of second end portion;

[0055] 6, pull spring;

[0056] 7, locking member; 71, rotating body; 72, extension; 73, rotating body groove; 74, clamping groove;

[0057] 8, back gear; 81, gear body; 82, extension rod; 83, back gear groove;

[0058] 9, clamping hook;

[0059] 10, frame;

[0060] 20, operating wrench;

[0061] E, working head; E1, execution component;

[0062] a, rotating axis of transmission gear lever; b, axis of transmission gear;

[0063] x, front-rear direction; y, left-right direction; z, up-down direction. DETAILED DESCRIPTION

[0064] The application will be further described with reference to the following examples. However, the application is not limited to the following examples. The implementation conditions used in the examples can be further adjusted according to different requirements of specific use, and the implementation conditions not mentioned are the conventional conditions in the industry. The technical features involved in each embodiment of the application can be combined with each other as long as there is no conflict.

[0065] In the following, only some exemplary embodiments are described in brief. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the application. Therefore, the drawings and the description are considered to be essentially exemplary rather than limiting.

[0066] Unless specifically indicated otherwise, all terms used in the specification have the meanings commonly understood by those skilled in the art. For the sake of brevity and / or clarity, well-known functions or constructions or functions or constructions not related to the inventive points of the present application are not described in detail.

[0067] In the description of the embodiments of the present application, it should be understood that the terms "far", "near" and the like indicate the position or positional relationship based on the position of the handle in use, wherein the side close to the operator is near and the side away from the operator is far, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular position, be constructed and operated in a particular position, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0068] In addition, the terms "first", "second" are only for description purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0069] The following disclosure provides many different embodiments or examples for implementing different structures of the embodiments of the present application. In order to simplify the disclosure of the embodiments of the present application, the components and arrangements of specific examples are described below. Of course, they are only examples and the purpose is not to limit the embodiments of the present application. In addition, the embodiments of the present application can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, and in itself does not indicate the relationship between the various embodiments and / or arrangements discussed.

[0070] Embodiment 1

[0071] The present application provides an anastomat, referring to Figure 15 , comprising a handle and a working head E detachably connected with the handle, the distal end part of the working head E is an execution component E1, which is suitable for clamping, suturing / anastomosing, cutting and the like of tissue, the specific structure of the working head E and the connection mode can refer to the prior art.

[0072] The handle has a trigger, a holding part and the like, when the trigger is cocked towards the holding part, the jaw closure of the execution component E1 can be realized, the specific structure and connection relationship of the trigger, the holding part and the like can refer to the prior art, and the present application does not make specific limitation. The handle of the present application has a manual return mechanism, when an unexpected situation occurs to cause the instrument to stop running, the rack 3 can be reset through the manual return mechanism, so that the cutting knife can be returned. Further discussion is made below for the handle.

[0073] The handle, referring to Figures 1 to 14 , comprises a shell 1, a drive assembly, a transmission assembly and a manual return mechanism arranged in the shell 1 respectively.

[0074] The transmission assembly comprises a rack 3 and a transmission gear 4, the rack 3 is slidably arranged in the housing 1 and extends along the front-rear direction x, the transmission gear 4 is operatively connected with the driving assembly and the rack 3 and can rotate around its axis under the driving of the driving assembly to drive the rack 3 to move forward or backward.

[0075] Specifically, referring to Figure 11 , the driving assembly comprises a motor 2, the output shaft of the motor 2 is provided with a motor gear 21 for outputting power, the motor gear 21 can rotate around its axis under the driving of the motor 2, and the axis of the motor gear 21 extends along the up-down direction z. The rack 3 is located above the motor gear 21, and the transmission gear 4 is located on the same side of the rack 3 and the motor gear 21 (in this embodiment, the transmission gear 4 is located on the right side of the rack 3 and the motor gear 21), the side of the rack 3 provided with the transmission gear 4 has a tooth surface 31 matched with the transmission gear 4, and the transmission gear 4 can be engaged with the rack 3 and the motor gear 21 at the same time. When the motor 2 is started, the transmission gear 4 is driven to rotate by the rotation of the motor gear 21, so as to realize the forward movement or backward movement of the rack 3. Further, the axis b of the transmission gear 4 is parallel to the axis of the motor gear 21.

[0076] The manual backward movement mechanism comprises a transmission gear lever 5, an elastic member, a locking member 7 and a backward movement assembly.

[0077] The transmission gear lever 5 is rotatably arranged in the housing 1, the rotation axis a of the transmission gear lever 5 is parallel to the axis b of the transmission gear 4, and the transmission gear lever 5 has a first end 51 and a second end 52 located on both sides of the rotation axis, the first end 51 is connected to the transmission gear 4, so that when the transmission gear lever 5 rotates, the transmission gear lever 5 can drive the transmission gear 4 to move to a locked state connected with the rack 3 and the driving assembly or to an unlocked state disconnected with the rack 3 and / or the driving assembly.

[0078] The existing handle manual return mechanism mostly realizes the disengagement (i.e. unlocking) of the transmission gear and the rack or the motor gear by moving the transmission gear along its axial direction, which can be specifically realized by applying upward or downward force to move the transmission gear upward or downward to disengage the engagement with the rack or the motor gear, for example, the handle return mechanism disclosed in patents CN111202553B and CN105997171B. However, in actual operation, due to the strong output force of the motor after being locked, there is a huge extrusion force between the motor and the transmission gear, so in practice, a larger force is often needed to disengage the transmission gear from the rack or the motor gear. The present application sets the transmission gear lever 5, etc., and uses the transmission gear lever 5 to drive the transmission gear 4 to rotate, so that the transmission gear 4 is disengaged from the rack 3 and / or the driving assembly along its radial direction, which does not exist the huge friction force caused by the lateral force when the transmission gear 4 moves along the axial direction, which is more labor-saving and convenient for the operator to operate.

[0079] Further, referring to Figures 1 to 8 , the transmission gear lever 5 is located at the side of the rack 3, and in this embodiment, it is specifically located at the right side of the rack 3. Referring to Figure 12 , the first end 51 of the transmission gear lever 5 has a first accommodating groove 511 for accommodating the transmission gear 4, and the transmission gear 4 is rotationally arranged in the first accommodating groove 511. When the transmission gear lever 5 is rotated and drives the transmission gear 4 to be in the unlocked state, the transmission gear 4 is simultaneously disengaged from the engagement with the rack 3 and the motor gear 21. The second end 52 of the transmission gear lever 5 has a second accommodating groove 521.

[0080] The elastic member is configured to have a tendency to connect the transmission gear 4 with the rack 3 and the driving assembly or to have a tendency to disconnect the transmission gear 4 from the rack 3 and / or the driving assembly.

[0081] Specifically, one end of the elastic member is fixedly arranged in the housing 1, and the other end is connected to the side of the second end 52 away from the first end 51 (in this embodiment, the other end of the elastic member is connected to the proximal side 522 of the second end), and the elastic force of the elastic member makes the transmission gear lever 5 have a tendency to drive the transmission gear 4 to be disconnected from the rack 3 and the motor gear 21. As a preferred, the elastic member is a tension spring 6.

[0082] The locking member 7 is rotationally arranged in the housing 1, and the locking member 7 can overcome the elastic force of the elastic member and be transferred from the locked position to the unlocked position to make the transmission gear 4 be in the unlocked state (see Figure 8 ), or be transferred from the unlocked position to the locked position to make the transmission gear 4 be in the locked state (see Figure 4 ).

[0083] Further, the locking member 7 is arranged between the rack 3 and the second end portion 52. In the present embodiment, the locking member 7 is partially arranged in the second accommodating groove 521 and is close to the proximal side 522 of the second end portion. Specifically, referring to Figure 13 The locking member 7 comprises a rotating body 71 and an extension 72 arranged on the rotating body 71 and extending radially outwardly. When the locking member 7 is in the locked position, the extension 72 abuts against the second end portion 52, specifically, the inner side wall of the second accommodating groove 521. When the locking member 7 is in the unlocked position, the extension 72 is not in contact with the second end portion 52.

[0084] In order to avoid the malfunctioning instrument being used again, the manual back-off mechanism further comprises a catch 9. The catch 9 is arranged in the housing 1 and is between the rack 3 and the second end portion 52. When the locking member 7 is in the unlocked position, the catch 9 cooperates with the extension 72 to keep the extension 72 from contacting the second end portion 52. Specifically, the free end of the extension 72 is provided with a catch groove 74. When the locking member 7 is in the unlocked position, the hook of the catch 9 is inserted into the catch groove 74, thereby keeping the locking member 7 in the unlocked position.

[0085] Further, in order to facilitate the rotation of the locking member 7, the free end of the extension 72 is outwardly arched and is generally arc-shaped.

[0086] Further, in order to facilitate the operation of the locking member 7 by the operator, the rotating body 71 is provided with a rotating body groove 73 recessed inwardly or a rotating body protrusion 71 protruding outwardly. The rotating body groove 73 or the rotating body protrusion 71 is exposed in the housing 1, thereby facilitating the operator to use the operation wrench 20 to operate the rotation of the locking member 7. Specifically, the rotating body groove 73 or the rotating body protrusion 71 is generally cross-shaped. In the present embodiment, the rotating body 71 is provided with the rotating body groove 73 recessed inwardly. The operation wrench 20 is inserted into the rotating body groove 73, thereby rotating the rotating body 71 about the axial line thereof. The axial line of the rotating body 71 extends along the up-down direction z.

[0087] The back-off assembly is connected to the rack 3. When the transmission gear 4 is in the unlocked state, the operation of the back-off assembly can make the rack 3 advance or retreat.

[0088] Specifically, the back-off assembly comprises a back-off gear 8 rotatably arranged in the housing 1 and engaged with the rack 3. Further, the back-off gear 8 is between the rack 3 and the second end portion 52 and is close to the rotating axial line a of the transmission gear lever 5. Specifically, the back-off gear 8 is partially arranged in the second accommodating groove 521 and the back-off gear 8 does not interfere with the movement of the transmission gear lever 5. More specifically, referring to Figure 14The back gear 8 comprises a gear body 81 and an extension rod 82 connected to the gear body 81 and extending axially outwardly, the extension rod 82 extends upwardly through the second accommodating groove 521, the extension rod 82 is coaxial with the gear body 81 and the axial center line thereof extends along the up-down direction z.

[0089] In order to facilitate the operator to operate the back gear 8, the extension rod 82 is provided with a back gear groove 83 recessed inwardly or a back gear 8 protrusion protruding outwardly, the back gear groove 83 or the back gear 8 protrusion is exposed in the housing 1, which facilitates the operator to use the operating wrench 20 to operate the rotation of the back gear 8.

[0090] Further, the back gear groove 83 or the back gear 8 protrusion is substantially in the shape of a "cross". In the embodiment, the back gear groove 83 is provided on the extension rod 82, the operating wrench 20 is inserted into the back gear groove 83, which can rotate the back gear 8 around the axial center line thereof and drive the rack 3 to advance or retreat.

[0091] The manual back mechanism further comprises an operating wrench 20 detachably arranged in the housing 1, the operating wrench 20 can be cooperated with the locking member 7 and the back assembly respectively to operate the movement of the locking member 7 and the back assembly.

[0092] Further, the operating wrench 20 is arranged above the transmission gear lever 5, the operating wrench 20 comprises a main body portion and a cooperating portion arranged at one end of the main body portion and cooperable with the back gear groove 83 or the rotating body groove 73, preferably, the cooperating portion extends downwardly perpendicularly to the main body portion. In the embodiment, the free end of the cooperating portion is provided with a "cross" protrusion cooperable with the rotating body groove 73 and the back gear groove 83, when the protrusion of the cooperating portion is inserted into the back gear groove 83 or the rotating body groove 73, the other end of the main body portion of the operating wrench 20 can be easily rotated to rotate the back gear 8 or the locking member 7. The operating wrench 20 can be easily rotated to rotate the locking member 7, so as to easily switch the transmission gear 4 between the unlocked state and the locked state; meanwhile, the operating wrench 20 can also be easily rotated to rotate the back gear 8, so as to easily realize the back of the rack 3.

[0093] In order to prevent the movement of the back gear 8 from being limited, the middle portion of the operating wrench 20 is arched outwardly to form a bending portion, the extension rod 82 of the back gear 8 is located at the inner side of the bending portion, so as to avoid the contact between the extension rod 82 and the operating wrench 20, and the movement of the operating wrench 20 and the back gear 8 does not interfere with each other.

[0094] The handle further comprises a rack 10 fixedly arranged in the housing 1, the transmission gear lever 5, the elastic member, the locking member 7, the back assembly and the clamping hook 9 are arranged on the rack 10. Further, the rack 10 extends along the front-rear direction x and does not interfere with the rack 3.

[0095] The shell 1 has an operation window which is located on the shell 1 outside the locking member 7 and the back-off assembly, and a cover 13 is installed on the operation window which can be opened or closed. Specifically, the shell 1 comprises a first shell 11 and a second shell 12 which are detachably connected, and the operation window is located above the second shell 12.

[0096] The working process of the anastomat in the embodiment is as follows: when the anastomat is in a normal state, referring to Figures 1 to 4 , the locking member 7 abuts against the second end 52, the transmission gear 4 is engaged with the rack 3 and the motor gear 21 respectively, and the back-off gear 8 is engaged with the gear 3.

[0097] When the anastomat fails, as shown in Figure 10 , the cover 13 is opened, the operation wrench 20 is taken out from the storage position and is rotated clockwise, the matching part of the operation wrench 20 is inserted into the rotating main body groove 73 of the locking member 7, the operation wrench 20 is rotated counterclockwise, the hook part of the catch 9 is inserted into the catch groove 74 of the locking member 7 (the locking sound of the catch 9 and the catch groove 74 is heard), and the rotation is stopped at this time, at which the locking member 7 is kept in the unlocked position, the transmission gear lever 5 is rotated under the action of the tension spring 6, and the transmission gear 4 is driven to disengage from the engagement with the rack 3 and the motor gear 21, and the back-off gear 8 is always kept in engagement with the gear 3 under the action of the transmission gear lever 5, as shown in Figure 8 . Then the operation wrench 20 is pulled out and inserted into the back-off gear groove 83 of the back-off gear 8, the operation wrench 20 is rotated counterclockwise, and the rack 3 is back-off under the action of the back-off gear 8.

[0098] The anastomat or the handle has at least the following advantages:

[0099] (1) Simple operation and labor saving: by means of the operation wrench 20 with a larger lever, the locking member 7 can be easily rotated and passed through the dead point, the transmission gear lever 5 is moved and the transmission gear 4 is driven to disengage from the engagement with the rack 3 and the motor gear 21 along the radial direction, and there is no large friction force caused by the lateral force when the transmission gear 4 moves along the axial direction.

[0100] Further, when the manual back-off operation is performed, the back-off gear 8 can be still rotated relatively easily by means of the operation wrench 20, so that the rack 3 and the front end structure are pulled back to the initial position.

[0101] (2) High reliability: the dead point of force transmission is formed by the locking member 7 cooperating with the transmission gear lever 5 in the locked state, and even if there is a large lateral force on the transmission gear 4, the device will not be unlocked accidentally.

[0102] (3) Automatic locking: when the locking member 7 moves to the unlocking position, it can be automatically locked in the unlocking position, facilitating manual operation of pulling back the rack 3, and avoiding the risk of secondary use of the malfunctioning instrument.

[0103] (4) Low production cost: the unlocking and manual back-off functions are realized by using fewer components, and the manufacturing is simple, the installation is convenient, and the cost is low.

[0104] The above has made a detailed description of the present application, the purpose is to let the person who is familiar with this field technology can understand the content of the present application and implement, and cannot limit the protection scope of the present application with this, all equivalent changes or modifications according to the spirit of the present application should be covered in the protection scope of the present application.

Claims

1. A handle with a manual back-off mechanism, comprising a housing, a driving assembly arranged in the housing, and a transmission assembly, the transmission assembly comprising a transmission gear and a rack extending in a front-rear direction, the transmission gear and the rack being arranged in the housing respectively, the transmission gear being operatively connected with the driving assembly and the rack respectively and being capable of rotating in a forward direction or a reverse direction about its axis under the drive of the driving assembly and driving the rack to move forward or backward, characterized in that: The handle further comprises a manual back-off mechanism, the manual back-off mechanism comprising: a transmission gear lever rotatably arranged in the housing, an axis of rotation of the transmission gear lever being parallel to an axis of the transmission gear, the transmission gear lever having a first end and a second end on both sides of the axis of rotation, the first end being connected to the transmission gear, so that when the transmission gear lever rotates, the transmission gear lever can drive the transmission gear to move to a locked state connected with the rack and the drive assembly or to an unlocked state disconnected with the rack and / or the drive assembly; a resilient member configured to make the transmission gear have a tendency to be connected with the rack and the drive assembly or to be disconnected with the rack and / or the drive assembly; a locking member rotatably arranged in the housing, the locking member being capable of overcoming the elastic force of the resilient member and being transferred from a locked position to an unlocked position to make the transmission gear in the unlocked state or being transferred from the unlocked position to the locked position to make the transmission gear in the locked state under the implementation of rotational movement; a back-off assembly connected to the rack, the operation of the back-off assembly can make the rack advance or retreat when the transmission gear is in the unlocked state.

2. The handle of claim 1, wherein: The locking member is arranged between the rack and the second end, the locking member comprising a rotating body and an extension arranged on the rotating body and extending radially outward, the extension abutting on the second end when the locking member is in the locked position, and the extension is not in contact with the second end when the locking member is in the unlocked position.

3. The handle of claim 2, wherein: The handle further comprises a catch arranged in the housing and between the rack and the second end, the catch cooperating with the extension when the locking member is in the unlocked position, so that the extension is kept not in contact with the second end; and / or, The rotating body has an inwardly recessed groove or an outwardly protruding protrusion, the groove or the protrusion being exposed in the housing to facilitate the operator to use the operation wrench to operate the rotation of the locking member; and / or, The locking member is close to the side of the second end away from the first end.

4. The handle of claim 1, wherein: One end of the resilient member is fixedly arranged in the housing, and the other end is connected to the side of the second end away from the first end, the elastic force of the resilient member making the transmission gear lever have a tendency to drive the transmission gear to be disconnected with the rack and / or the drive assembly.

5. The handle of claim 1, wherein: The back-off assembly comprises a back-off gear rotatably arranged in the housing around its axis and engaged with the rack.

6. The handle of claim 5, wherein: The back-off gear is located between the rack and the second end and close to the axis of rotation of the transmission gear lever, the axis of the back-off gear being parallel to the axis of the transmission gear; and / or, The back-off gear has an inwardly recessed groove or an outwardly protruding protrusion, the groove or the protrusion being exposed in the housing to facilitate the operator to use the operation wrench to operate the rotation of the back-off gear.

7. The handle of claim 1, wherein: The first end portion has a first accommodating groove for accommodating the transmission gear, and the transmission gear is rotatably arranged in the first accommodating groove; and / or, The second end portion has a second accommodating groove for accommodating the locking member and the reset assembly, and the locking member and the reset assembly are partially or entirely arranged in the second accommodating groove, and the reset assembly does not interfere with the movement of the transmission gear lever.

8. The handle of claim 1, wherein: The handle further comprises an operation wrench which is detachably arranged in the housing, and the operation wrench is respectively matched with the locking member and the reset assembly to operate the locking member and the reset assembly. The handle further comprises a rack which is fixedly arranged in the housing, and the transmission gear lever, the elastic member, the locking member and the reset assembly are respectively arranged on the rack. The housing has an operation window which is hollow, and the operation window is arranged on the housing outside the locking member and the reset assembly, and a cover which can be opened or closed is arranged on the operation window. The driving assembly comprises a motor having a motor gear, the motor gear can be positively rotated or reversely rotated around its axis under the driving of the motor, the motor gear is arranged below the rack and its axis is parallel to the axis of the transmission gear, the transmission gear is arranged on the same side of the rack and the rack, the transmission gear is respectively engaged with the motor gear and the rack when the transmission gear is in the locking state, and the axis of the transmission gear extends in the up-down direction.

9. The handle of claim 1, wherein: The anastomat further comprises the handle according to any one of claims 1 to 9, and the working head is connected to the handle.

10. An anastomat comprising a working head, characterised in that: ​

Images