Anastomat

Abstract

The utility model provides an anastomat which comprises a retracting mechanism, the retracting mechanism comprises a rack, a first gear, a second gear and a control unit, the first gear can be meshed with or separated from the rack, and the control unit comprises a control piece, a second mounting shaft and a retracting knob. The second mounting shaft penetrates through the control piece and is connected with the tool retracting knob and the second gear, the tool retracting knob rotatably drives the second gear and the rack to move in a meshed mode, and the control piece comprises an operation part capable of limiting the tool retracting knob in the operation part or releasing the tool retracting knob to the outside of the operation part; and the operating part is in transmission fit with the first gear, so that the first gear is separated from the rack when the tool retracting knob is released out of the control piece. The tool retracting mechanism solves the problems that in the prior art, a tool retracting mechanism is laborious to operate, and tool retracting fails.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of medical instrument manufacturing, especially an anastomat. BACKGROUND

[0002] Anastomosis apparatus is often used for endoscopic surgical instrument to replace the traditional open surgery device, because smaller incision often shortens postoperative recovery time and reduces complications, therefore, a series of endoscopic surgical instruments suitable for accurately placing the distal end effector through the sleeve of the trocar at the desired surgical site have been developed, and these distal end effectors have several methods to enter the tissue to achieve diagnostic or therapeutic effect.

[0003] As the most commonly used minimally invasive surgical instrument, the anastomat needs to adjust the positioning and accurate and firm locking of the distal end effector at any time with the help of an endoscope according to the characteristics of the operation, and is not limited to insertion and transmission. At the current stage, the angle adjustment of the distal end effector of the anastomat is controlled by an articulation mechanism, and the unlocking and locking of the articulation control mechanism are controlled by a knob assembly. In the design and manufacturing process of the electric endoscopic anastomat, the risk that the cutting knife that has been fired is stuck in the jaw and cannot move due to the failure of the battery, circuit or motor of the instrument body, so that the jaw cannot be opened to hold the tissue, and the anastomat cannot be taken out of the puncture sleeve, and the doctor has to temporarily convert the minimally invasive surgery into open surgery in the case that the tissue cannot be separated from the jaw and the anastomat cannot be taken out of the puncture sleeve, and other medical accidents occur (usually the electric endoscopic anastomat is discarded immediately after the emergency knife returning function is used and cannot be used continuously).

[0004] The emergency knife returning mechanism in the prior art electric endoscopic anastomat is seriously homogeneous, and most of them adopt the structure that a wrench is matched with a pawl. The structure includes a wrench that can rotate around the shaft reciprocally by manual hand, the wrench is provided with a cam member and a pawl member that can rotate with the wrench, and the wrench that is initially accommodated in the anastomat is rotated outward by the hand, drives the cam member to rotate and press the power gear to make the power gear disengage from the transmission rack of the cutting knife, at the same time, drives the pawl member to rotate to make the pawl part on the pawl member engage with the wall rack on the transmission rack to pull back the transmission rack. When the cutting knife has a long firing distance, i.e. the transmission rack has a long forward distance, the wrench can be reciprocally pulled many times until the cutting knife, i.e. the transmission rack, is completely reset. Although the rotatable wrench has a certain effect of force-saving lever, the pawl part and the wall rack on the transmission rack are engaged and locked to form a force point, and the essence is to laterally apply force to the transmission rack to pull it back. When the instrument body fails and the cutting knife is stuck too tightly in the jaw, manual operation will be very laborious, which may cause the emergency knife returning mechanism to fail and bring inconvenience to the subsequent operation. SUMMARY

[0005] The utility model discloses a kind of anastomat, to solve the problem of existing technology in the operation of tool withdrawal mechanism, and there is tool withdrawal failure.

[0006] In order to realize the above-mentioned purpose of the utility model, an embodiment of the utility model provides an anastomat, comprising a tool withdrawal mechanism, wherein the tool withdrawal mechanism comprises a rack, a first gear, a second gear and a control unit, the first gear can be engaged with or separated from the rack, the control unit comprises a control member, a second mounting shaft and a tool withdrawal knob, the second mounting shaft is provided in the control member and connected with the tool withdrawal knob and the second gear, the tool withdrawal knob can rotatably drive the second gear to engage with the rack, the control member comprises an operating part that can limit the tool withdrawal knob therein or release it outside, and the operating part is in transmission cooperation with the first gear so that the first gear is separated from the rack when the tool withdrawal knob is released outside the control member.

[0007] As a further improvement of the embodiment of the utility model, wherein the rack comprises a body and a first row of teeth and a second row of teeth arranged on the body, the first gear can be engaged with the first row of teeth, and the second gear is engaged with the second row of teeth.

[0008] As a further improvement of the embodiment of the utility model, wherein the second gear is located outside the control member, the second mounting shaft is connected with the second gear by a key from the central axis of the second gear and can move relative to the second gear in the axial direction of the second gear.

[0009] As a further improvement of the embodiment of the utility model, wherein the control member comprises a mounting groove, the limiting part comprises a limiting frame connected between two side walls of the mounting groove, the mounting groove and the limiting frame can define a containing space for accommodating the tool withdrawal knob, the limiting frame is provided with an opening through which the tool withdrawal knob can pass, and the two ends of the limiting frame can slide on the two side walls to move the tool withdrawal knob from the opening to the side of the limiting frame opposite to the containing space.

[0010] As a further improvement of the embodiment of the utility model, wherein the control unit comprises a compression spring arranged in the mounting groove, the compression spring is sleeved on the second mounting shaft, one end of the compression spring abuts against the bottom wall of the mounting groove, and the other end of the compression spring can abut against the tool withdrawal knob to limit it on the inside of the limiting frame, when the limiting frame moves to the position where the tool withdrawal knob can pass through the opening, the compression spring can drive the tool withdrawal knob to move to the side of the limiting frame opposite to the containing space.

[0011] As a further improvement of the embodiment of the utility model, wherein, the control piece still includes first installation shaft, first installation shaft from the first gear's middle axis direction is equipped in this first gear, the first gear can pivot around the first installation shaft, the limit frame can slide along the first gear's middle axis direction and with the first gear transmission cooperation, to make this first gear with the rack mesh or separate.

[0012] As a further improvement of the embodiment of the utility model, wherein, the anastomat still includes drive unit, the drive unit includes transmission gear, output shaft and installation shell, the output shaft is equipped in the installation shell, the transmission gear is equipped on the outside of the installation shell and is set on the output shaft, the transmission gear can be engaged with the first gear.

[0013] As a further improvement of the embodiment of the utility model, wherein, the first installation shaft includes shaft body and end block, the shaft body is arranged on the installation shell, the end block is arranged on the end of the shaft body away from the installation shell, the first gear is set on the shaft body close to the position of the end block and can pivot around the shaft body, and the first gear can be driven to move on the shaft body in the axial direction.

[0014] As a further improvement of the embodiment of the utility model, wherein, the control unit further includes compression spring, the compression spring is set on the shaft body and one end of the compression spring is in abutment with the first gear, the other end is in abutment with the installation shell, the limit frame can be in abutment with the upper surface of the first gear to drive the first gear to move in the axial direction.

[0015] Another embodiment of the utility model still provides an anastomat, including tool withdrawal mechanism and handle, wherein, the tool withdrawal mechanism includes rack, first gear, second gear and control unit, the first gear can be engaged with the rack or separated, the control unit includes control piece, second installation shaft and tool withdrawal knob, the second installation shaft is equipped in control piece and is connected tool withdrawal knob and second gear, the tool withdrawal knob can rotatably drive second gear and the rack engagement movement, the control piece includes the operation part that can limit tool withdrawal knob in or release to its outside, the operation part with the first gear transmission cooperation to when the tool withdrawal knob is released to the outside of control piece, the first gear is separated with the rack, the operation handle includes the main part that can accommodate the tool withdrawal mechanism and operation cover, the main part has the window that can expose the tool withdrawal knob and operation part, the operation cover is detachably arranged on the main part to cover the window, the tool withdrawal knob can be moved to the handle outside through the window.

[0016] Compared with the prior art, the utility model has the beneficial effects that:

[0017] By manipulating the limiting frame to move along the central axis of the first gear towards it, the limiting frame will abut against the first gear, thereby disengaging the first gear from the rack and disengaging it from the meshing state. When the limiting frame performs this movement, the retraction knob can smoothly pass through the opening and move to the side of the limiting frame facing away from the receiving space. By rotating the retraction knob, the second gear can be easily engaged with the rack via the second mounting shaft, allowing for relatively effortless manual retraction of the stapler. Attached Figure Description

[0018] Figure 1 This is a partial structural diagram of a stapler when the retraction knob is not released, according to an embodiment of the present invention.

[0019] Figure 2 for Figure 1 Top view of the anastomosis device;

[0020] Figure 3 This is a schematic cross-sectional view along direction AA in the figure;

[0021] Figure 4 for Figure 1 A partial structural diagram;

[0022] Figure 5 for Figure 4 A schematic diagram of the exploded structure;

[0023] Figure 6 This is a partial structural diagram of a stapler when the retractor knob is released, according to an embodiment of the present invention.

[0024] Figure 7 for Figure 6 A partial schematic diagram of the front view;

[0025] Figure 8 for Figure 7 A schematic diagram of the cross-sectional structure;

[0026] Figure 9 This is a schematic diagram of a matching structure provided for another embodiment of the present invention;

[0027] Figure 10 for Figure 9 A schematic diagram of the anastomosis device after the operating cover is opened;

[0028] Figure 11 for Figure 10 A schematic diagram of the structure of the anastomosis device operating section after it has been operated.

[0029] The above description of the figures includes the following reference numerals:

[0030] 1. Retracting mechanism;

[0031] 11. The first gear;

[0032] 12. The second gear;

[0033] 121. The mounting hole;

[0034] 13. The rack;

[0035] 131. The rack body;

[0036] 132. The first row of teeth;

[0037] 133. The second row of teeth;

[0038] 141. The control member;

[0039] 1411. The mounting groove;

[0040] 14111. The guide groove;

[0041] 14112. The locking structure;

[0042] 1412. The limiting frame;

[0043] 14121. The opening;

[0044] 1413. The compression spring;

[0045] 142. The first mounting shaft;

[0046] 1421. The shaft body;

[0047] 1422. The end stop;

[0048] 143. The second mounting shaft;

[0049] 1431. The stop;

[0050] 144. The tool withdrawal knob;

[0051] 145. The compression spring;

[0052] 2. The driving unit;

[0053] 21. The transmission gear;

[0054] 22. The output shaft;

[0055] 23. The mounting shell;

[0056] 3. The handle;

[0057] 31. The main body;

[0058] 311. The window;

[0059] 32. The operation cover. DETAILED DESCRIPTION

[0060] It should be noted that the embodiments and features in the embodiments can be combined with each other in the case of no conflict. The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0061] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0062] In the utility model, in the case where no opposite statement is made, the orientation words such as "upper, lower, top, bottom" are generally for the direction shown in the drawings, or for the vertical, perpendicular or gravity direction of the component itself; similarly, for the convenience of understanding and description, "inner, outer" refers to the inner and outer of the contour of each component itself, but the above orientation words are not used to limit the utility model.

[0063] In order to solve the problem that the tool withdrawal mechanism in the prior art is very laborious to operate and may fail to withdraw the tool, the utility model provides an anastomat.

[0064] The utility model will be described in further detail below in combination with the drawings and specific embodiments.

[0065] As shown in Figures 1-8 The utility model provides an anastomat, comprising a tool withdrawal mechanism 1, wherein the tool withdrawal mechanism 1 comprises a rack 13, a first gear 11, a second gear 12 and a control unit, the first gear 11 can be engaged with or separated from the rack 13, the control unit comprises a control member 141, a second mounting shaft 143 and a tool withdrawal knob 144, the second mounting shaft 143 is arranged in the control member 141 and is connected with the tool withdrawal knob 144 and the second gear 12, the tool withdrawal knob 144 can rotatably drive the second gear 12 to engage with the rack 13, the control member 141 comprises an operating part that can limit the tool withdrawal knob 144 therein or release it outside, and the operating part is in transmission cooperation with the first gear 11 so that the first gear 11 is separated from the rack 13 when the tool withdrawal knob 144 is released outside the control member 141.

[0066] In this way, when the anastomat is stuck and cannot move, the operating part of the control member 141 is operated to release the tool withdrawal knob 144 to the outside of the control member 141, the operating part is in transmission cooperation with the first gear 11, the first gear 11 can be separated from the rack 13, and the second gear 12 can be driven to engage with the rack 13 by rotating the tool withdrawal knob 144, so that the tool withdrawal is completed, and in this process, since the first gear 11 has been separated from the rack 13, the second gear 12 can be pivoted to engage with the rack 13 with less effort, and the tool withdrawal effect can be ensured.

[0067] It should be noted that in this embodiment, the rack 13 is in transmission cooperation with the cutting knife of the anastomat, and the first gear 11 and the second gear 12 can be respectively in transmission cooperation with the rack 13 to enable the cutting knife to move back and forth along the knife slot.

[0068] Reference Figure 4 As shown, the rack 13 is designed with exquisite craftsmanship, including a rack body 131 and two rows of teeth distributed on the rack body 131, such as the first row of teeth 132 and the second row of teeth 133. This double-row tooth design not only enhances the structural strength of the rack, but also improves the stability and efficiency of transmission.

[0069] Among them, the first gear 11 is specially meshed with the first row of teeth 132, which is used to drive the rack in the normal working state, and then control the movement of the cutting knife. The second gear 12 is meshed with the second row of teeth 133, which is mainly used for the knife withdrawal function. When the first gear 11 is separated from the rack, the second gear 12 can easily cooperate with the second row of teeth 133 to realize smooth knife withdrawal operation. This paired design of double gears and double rows of teeth not only ensures the flexibility of the anastomat operation, but also greatly improves the safety and convenience in the use process.

[0070] Further, as shown in Figure 4 The second gear 12 is arranged outside the control member 141, which optimizes the space utilization and makes the replacement and maintenance of the gear more convenient.

[0071] Next, as shown in Figure 5 The connection between the second mounting shaft 143 and the second gear 12 is carefully designed. Specifically, the second mounting shaft 143 is keyed from the central axis direction of the second gear 12, ensuring stable cooperation between the two, while allowing the second mounting shaft 143 to move relatively along the axial direction of the second gear 12.

[0072] This design not only improves the flexibility of transmission, but also enhances the stability and durability of the overall mechanical structure. It is worth noting that the second mounting shaft 143 usually adopts a cross key design, which can provide good torque transmission performance and ensure the precise alignment between the shaft and the gear. Accordingly, the second gear 12 is provided with a cross-shaped mounting hole 121 along its central axis direction, which further enhances the connection strength and stability between the gear and the mounting shaft. Through this unique design and connection method, the second gear 12 and the second mounting shaft 143 can work efficiently in cooperation.

[0073] In the embodiment, the tool withdrawal knob 144 is usually arranged on the first end of the second mounting shaft 143, and rotating the tool withdrawal knob 144 can apply torque to the second gear 12 through the second mounting shaft 143, so as to enable the second gear 12 to meshingly move relative to the rack 13.

[0074] Preferably, in the embodiment, referring to Figure 3 and Figure 4 , the second mounting shaft 143 has a second end arranged relative to the first end, and a stop portion 1431 is formed on the second end, which is usually a flange formed on the second end and extending radially outward of the second mounting shaft 143.

[0075] In this way, when the second mounting shaft 143 slides relative to the second gear 12 along the axial direction of the second gear 12, the second mounting shaft 143 will not slide out of the second gear 12, so as to ensure that the second mounting shaft 143 can drive the second gear 12 to pivot about the axis thereof.

[0076] Further, referring to Figure 2 and Figure 4 , the control member 141 comprises a mounting groove 1411, which not only provides a stable mounting environment for the tool withdrawal knob 144, but also cooperates with other components to ensure the compactness of the overall structure and the reliability of the function.

[0077] In particular, it is worth mentioning that the operating portion comprises a limiting frame 1412, which is arranged in the mounting groove 1411 and is ingeniously connected between the two side walls of the mounting groove 1411 to form a containing space capable of accommodating the tool withdrawal knob 144. This design can limit the tool withdrawal knob 144 in the containing space, so as to protect the tool withdrawal knob 144, and when it is necessary to rotate the tool withdrawal knob 144 for tool withdrawal, the tool withdrawal knob can be released out of the containing space.

[0078] Specifically, referring to Figure 4 , an opening 14121 is carefully arranged on the limiting frame 1412, and the size and position of the opening are accurately calculated to ensure that the tool withdrawal knob 144 can pass through the opening smoothly. More ingeniously, the two ends of the limiting frame 1412 in the transverse direction are designed to be slidable on the two side walls, which greatly improves the flexibility and convenience of operation. When it is necessary to operate the tool withdrawal knob, the limiting frame 1412 can be slid on the two side walls by gently pressing the limiting frame, and when the tool withdrawal knob 144 can pass through the opening 14121, the tool withdrawal knob 144 is moved from the opening 14121 to the side of the limiting frame 1412 opposite to the containing space, so that the second gear 12 can be driven by rotating the tool withdrawal knob 144.

[0079] Preferably, referring to Figure 4 As shown, two guide grooves 14111 can be arranged on the two side walls respectively, and the two ends of the limiting frame 1412 in the transverse direction can be slidably arranged in the two guide grooves 14111 respectively.

[0080] It can be understood that in the embodiment, the tool withdrawal knob 144 moves along the axial direction of the second gear 12, and the tool withdrawal knob 144 is connected with the second mounting shaft 143, so as to drive the second mounting shaft 143 to move along the axial direction of the second gear 12. It has been described above that the second mounting shaft 143 can move along the axial direction of the second gear 12, so the design here is fully supported.

[0081] Further, referring to Figure 3 and Figure 6 As shown, the control unit further comprises at least one compression spring 1413, which is arranged in the mounting groove 1411. The second mounting shaft 143 penetrates the bottom wall of the mounting groove 1411, and the compression spring 1413 is sleeved on the second mounting shaft 143, so that the stability of the compression spring can be ensured, and the compression spring can also apply appropriate pressure to the tool withdrawal knob 144.

[0082] Specifically, one end of the compression spring abuts against the bottom wall of the mounting groove 1411, and the other end can contact the tool withdrawal knob 144, so as to stably limit the tool withdrawal knob 144 inside the limiting frame 1412. This design not only provides stable support force for the tool withdrawal knob, but also can quickly release the tool withdrawal knob 144 when needed.

[0083] Since the second mounting shaft 143 penetrates the bottom wall of the mounting groove 1411, its position in the vertical direction relative to the mounting groove 1411 is fixed. When the limiting frame 1412 is pressed, the limiting frame 1412 moves downward in the vertical direction relative to the mounting groove 1411, and when it moves to the position where the tool withdrawal knob 144 can pass through the opening 14121, the compression spring 1413 will exert its elastic action to quickly and powerfully push the tool withdrawal knob 144 to the side of the limiting frame 1412 away from the containing space. This action is not only quick and accurate, but also greatly improves the convenience and efficiency of operation.

[0084] In this embodiment, the control element 141 may include a main body forming the accommodating space, such as a tool wall or frame structure, and the operating part may be a baffle or stop, etc., with a channel on the baffle or stop allowing the retracting knob 144 to pass through. Understandably, during the movement of the operating part relative to the main body, the retracting knob can be confined within the control element or released outside the control element through the channel. This utility model does not limit the specific structural form of the main body and the operating part; any scheme using the same or similar methods as this embodiment is covered within the protection scope of this utility model.

[0085] Furthermore, the control component also includes a key component, a first mounting shaft 142, which is precisely inserted into the gear 11 along its central axis. This design allows the first gear 11 to pivot freely around the first mounting shaft 142, providing the necessary conditions for the gear's flexible movement. Simultaneously, the stability and durability of the first mounting shaft provide crucial support for the reliability of the overall mechanical structure.

[0086] The limiting frame 1412 plays a crucial role in this mechanical system. It can not only slide along a direction parallel to the central axis of the first gear 11, but also precisely engage with the first gear 11 in transmission. This design allows the limiting frame to accurately control the meshing or disengagement state of the first gear 11 and the rack 13 during sliding.

[0087] When it is necessary to adjust the engagement state between the first gear 11 and the rack 13, simply slide the limiting frame 1412 on the two side walls of the mounting groove 1411 to easily achieve the engagement or disengagement of the first gear 11 and the rack 13. This ingenious design not only simplifies the operation process but also greatly improves the adjustability and adaptability of the mechanical system. It provides great convenience to users during both normal use and maintenance.

[0088] Further, refer to Figure 5 As shown, the anastomosis device is also equipped with a drive unit 2, which includes a transmission gear 21, an output shaft 22, and a mounting housing 23. The output shaft 22 passes through the mounting housing 23, and the transmission gear 21 is located outside the mounting housing and sleeved on the output shaft 22. The transmission gear 21 can mesh with the first gear 11. This design enables the transmission gear 21 to drive the first gear 11 to perform pivoting motion, providing stable power for the smooth operation of the anastomosis device.

[0089] Further, the first mounting shaft 142 is composed of a shaft body 1421 and an end stop 1422. Such a design not only ensures the strength and stability of the shaft, but also facilitates the installation and fixation of the first gear 11. The shaft body 1421 is stably arranged on the mounting shell 23, providing a solid support for the entire mechanical structure. The end stop 1422 is located at the end of the shaft body 1421 away from the mounting shell 23, serving as a limiting and protective function.

[0090] The first gear 11 is arranged on the shaft body 1421 near the end stop. Such a layout ensures that the first gear 11 can stably pivot around the shaft body 1421, and also facilitates the maintenance and replacement of the gear. Overall, the design of the first mounting shaft 142 fully considers the stability of the mechanical structure and the efficiency of transmission, providing a strong guarantee for the smooth operation of the stapler.

[0091] When the first gear 11 is arranged on the shaft body 1421 near the end stop, the first gear 11 can pivot around the shaft body 1421. In this state, the first gear 11 is engaged with the rack 13 to drive the movement of the push knife of the stapler.

[0092] In addition, the first gear 11 can also be driven to move axially on the shaft body 1421. The purpose of such a design is mainly to adjust the engagement state of the first gear 11 and the rack 13. When the first gear 11 moves axially on the shaft body 1421, the first gear 11 can be engaged or disengaged with the rack 13.

[0093] Further, the control unit also includes a compression spring 145. The compression spring 145 is arranged between the first gear 11 and the mounting shell 23, and is arranged on the shaft body 1421. One end of the compression spring 145 is in close contact with the first gear 11, and the other end is in contact with the mounting shell 23. Such a design not only provides the first gear 11 with a stable spring force, but also enables the first gear 11 to be located at a specific position on the first mounting shaft 142, i.e., near the end stop 1422, so that the first gear 11 can pivot around the central axis and be engaged with the rack 13.

[0094] Further, the limiting frame 1412 can be in contact with the upper surface of the first gear 11. When it is necessary to adjust the gear engagement state, the limiting frame 1412 will move towards the first gear along the central axis of the first gear. In this process, the limiting frame 1412 will be in contact with the first gear 11, causing the first gear 11 to move axially on the shaft body 1421, thereby disengaging from the rack 13 and exiting the engagement state.

[0095] It is worth mentioning that when the limiting frame 1412 moves as described above, the tool withdrawal knob 144 can pass through the opening 14121 smoothly and move to the side of the limiting frame 1412 facing away from the accommodation space. At this time, by rotating the tool withdrawal knob 144, the second gear 12 and the rack 13 can be easily driven into the meshing state by the second mounting shaft 143.

[0096] This design not only simplifies the operation process, but also greatly improves the convenience and labor-saving of manual tool withdrawal operation. The user only needs to rotate the tool withdrawal knob slightly to realize the manual tool withdrawal operation of the anastomat without excessive force and complex steps. This humanized design undoubtedly improves the user experience and reflects the ingenuity and practicality of product design.

[0097] In combination Figure 1 and Figure 4 It is shown that the utility model provides a kind of structure schematic diagram of anastomat in the structure of tool withdrawal knob 144 when not releasing in an embodiment. Figure 1 Figure 4 In , tool withdrawal knob 144 is limited in the control 141. Referring to the partial view shown in

[0098] , that is, tool withdrawal knob 144 is pressed on the inner side of limiting frame 1412 by compression spring 1413. At this time, the anastomat is in normal operation state, and the first gear 11 is engaged with the rack 13. Figure 1 Figure 4 When abnormal situation occurs and emergency tool withdrawal occurs, the user can press the control 141 to release the tool withdrawal knob 144.

[0099] Specifically, referring to the partial view shown in Figure 1 , that is, by pressing the upper end of limiting frame 1412 to make limiting frame 1412 move downward, when it moves to the opening 14121 through which tool withdrawal knob 144 can pass, compression spring 1413 quickly ejects tool withdrawal knob 144 from the opening out of the control 141. Thus, the user can rotate the tool withdrawal knob 144 to drive the second gear 12 to rotate, and the second gear 12 is engaged with the rack 13 when rotating to perform manual tool withdrawal. That is, and

[0100] The state shown in Figure 4 . Figure 6 Figure 7

[0101] It can be understood that when the limiting frame 1412 is pressed to move downward, the limiting frame 1412 can press the first gear 11, so that the first gear 11 moves along its axial direction to separate the first gear 11 from the rack 13. Thus, the process of manual tool withdrawal can be labor-saving, and the effect of tool withdrawal is ensured to avoid tool withdrawal failure.​​

[0102] It should be noted that in the process of the tool withdrawal knob 144 ejecting the control member 141, the second mounting shaft 143 connected with the tool withdrawal knob 144 can slide in the mounting hole 121 along the axial direction of the second gear 12, so that the second mounting shaft 143 is arranged in the opening 14121.

[0103] Preferably, referring to Figure 8 As shown, the slot wall of the guide slot is further provided with a locking structure 14112, which is usually a telescopic member. The limiting frame 1412 is provided with a clamping portion, for example, a clamping groove, which cooperates with the locking structure 14112. In the process of normal operation of the anastomat push knife, the locking structure 14112 is in the state of being abutted and retracted by the limiting frame 1412. When the limiting frame 1412 moves downward to a position where the compression spring 1413 can eject the tool withdrawal knob 144 out of the control member 141 through the opening 14121, the locking structure 14112 can be clamped and cooperated with the limiting frame 1412, for example, the telescopic member is clamped into the clamping groove, so that the position of the limiting frame 1412 and the mounting slot 1411 is relatively stable, avoiding the further downward movement of the limiting frame 1412, causing the pressure of the opening wall 14121 on the second mounting shaft 143, affecting the torque transmission effect of the tool withdrawal knob 144 on the second gear 12.

[0104] Figures 9-11 Another embodiment of the utility model provides an anastomat, which is shown and comprises a tool withdrawal mechanism 1 and a handle 3. The tool withdrawal mechanism 1 comprises a rack 13, a first gear 11, a second gear 12 and a control unit. The first gear 11 can be engaged with or separated from the rack 13. The control unit comprises a control member 141, a second mounting shaft 143 and a tool withdrawal knob 144. The second mounting shaft 143 is arranged in the control member 141 and connected with the tool withdrawal knob 144 and the second gear 12. The tool withdrawal knob 144 can rotate to drive the second gear 12 to move in engagement with the rack 13. The control member 141 comprises an operating portion, which can limit the tool withdrawal knob 144 therein or release the tool withdrawal knob 144 therefrom. The operating portion is in transmission cooperation with the first gear 11, so that when the tool withdrawal knob 144 is released from the control member, the first gear 11 is separated from the rack 13.

[0105] The handle 3 comprises a main body 31, which can accommodate the tool withdrawal mechanism 1, and an operating cover 32. The main body 31 is provided with a window 311, which can expose the tool withdrawal knob 144 and the operating portion. The operating cover 32 is detachably arranged on the main body 31 to cover the window 311. The tool withdrawal knob 144 can move out of the handle 3 through the window 311.

[0106] To Figure 10 When the operation cover 32 is opened, the user can operate the operation part through the window 311, and then the tool withdrawal knob 144 moves out of the handle from the window 311, as shown in Figure 11 .

[0107] Then, the tool withdrawal knob 144 can be rotated to manually withdraw the tool. As described above, it can be understood that the first gear 11 is separated from the rack 13 at this time, and the labor-saving effect can be achieved during the manual tool withdrawal, and the problem of tool withdrawal failure can be avoided.

[0108] In summary, the embodiments of the utility model realize the following technical effects:

[0109] By moving the limiting frame 1412 along the central axis of the first gear towards the first gear 11, the limiting frame 1412 abuts against the first gear 11, so that the first gear 11 is separated from the rack and disengaged. When the limiting frame 1412 moves as described above, the tool withdrawal knob 144 can smoothly pass through the opening 14121 and move to the side of the limiting frame 1412 opposite to the accommodation space. At this time, by rotating the tool withdrawal knob 144, the second gear 12 can be easily driven by the second mounting shaft 143 to enter the meshing state with the rack 13, and the manual tool withdrawal can be performed in a labor-saving manner, and the effect of tool withdrawal is ensured, and tool withdrawal failure is avoided.

[0110] Obviously, the above-described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the utility model.

[0111] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, work, device, component and / or combination thereof.

[0112] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0113] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An anastomat comprising a knife retraction mechanism, characterized in that, The tool withdrawal mechanism comprises a rack, a first gear, a second gear and a control unit, the first gear can be engaged with or separated from the rack, the control unit comprises a control member, a second mounting shaft and a tool withdrawal knob, the second mounting shaft is arranged in the control member and connects the tool withdrawal knob and the second gear, the tool withdrawal knob can rotate to drive the second gear to engage with the rack, the control member comprises an operating part which can limit the tool withdrawal knob or release the tool withdrawal knob, the operating part is in transmission cooperation with the first gear so that the first gear is separated from the rack when the tool withdrawal knob is released from the control member.

2. The anastomat of claim 1, wherein The rack comprises a body and a first row of teeth and a second row of teeth arranged on the body, the first gear can be engaged with the first row of teeth, and the second gear can be engaged with the second row of teeth.

3. The anastomat of claim 1 wherein, The second gear is located outside the control member, the second mounting shaft is connected with the second gear from the direction of the central axis of the second gear and can move relative to the second gear in the axial direction of the second gear.

4. The anastomosis device according to claim 3, wherein The control member comprises a mounting groove, the operating part comprises a limiting frame connected between two side walls of the mounting groove, the mounting groove and the limiting frame can define a containing space for containing the tool withdrawal knob, the limiting frame is provided with an opening through which the tool withdrawal knob can pass, and two ends of the limiting frame can slide on the two side walls to move the tool withdrawal knob from the opening to the side of the limiting frame away from the containing space.

5. The anastomosis device according to claim 4, wherein The control unit comprises a compression spring arranged in the mounting groove, the compression spring is sleeved on the second mounting shaft and abuts against the bottom wall of the mounting groove at one end, and abuts against the tool withdrawal knob at the other end to limit the tool withdrawal knob on the inner side of the limiting frame, when the limiting frame moves to the position where the tool withdrawal knob can pass through the opening, the compression spring can drive the tool withdrawal knob to move to the side of the limiting frame away from the containing space.

6. The anastomosis device according to claim 5, wherein The control member further comprises a first mounting shaft, the first mounting shaft is arranged in the first gear from the direction of the central axis of the first gear, the first gear can pivot around the first mounting shaft, the limiting frame can slide in parallel with the direction of the central axis of the first gear and is in transmission cooperation with the first gear to engage or separate the first gear with the rack.

7. The anastomat of claim 6 wherein, The anastomat further comprises a driving unit, the driving unit comprises a transmission gear, an output shaft and a mounting shell, the output shaft is arranged in the mounting shell, the transmission gear is arranged outside the mounting shell and is sleeved on the output shaft, and the transmission gear can be engaged with the first gear.

8. The anastomosis device according to claim 7, wherein The first mounting shaft comprises a shaft body and an end stop, the shaft body is arranged on the mounting shell, the end stop is arranged on the end of the shaft body away from the mounting shell, the first gear is sleeved on the shaft body close to the end stop and can pivot around the shaft body, and the first gear can be driven to move on the shaft body in the axial direction.

9. The anastomat of claim 8 wherein, The control unit further comprises a compression spring sleeved on the shaft body and abutting against the first gear at one end and abutting against the mounting shell at the other end, and the limiting frame is abuttable against the upper surface of the first gear to drive the first gear to move along the axial direction thereof.

10. An anastomat comprising a knife retraction mechanism and a handle, wherein: The tool withdrawal mechanism comprises a rack, a first gear, a second gear and a control unit, the first gear is engageable with or disengageable from the rack, the control unit comprises a control member, a second mounting shaft and a tool withdrawal knob, the second mounting shaft is arranged through the control member and connects the tool withdrawal knob and the second gear, the tool withdrawal knob is rotatable to drive the second gear to move in engagement with the rack, the control member comprises an operating portion capable of confining the tool withdrawal knob therein or releasing the tool withdrawal knob therefrom, the operating portion is in transmission cooperation with the first gear to disengage the first gear from the rack when the tool withdrawal knob is released from the control member, the handle comprises a main body portion capable of accommodating the tool withdrawal mechanism and an operating cover, the main body portion is provided with a window capable of exposing the tool withdrawal knob and the operating portion, and the operating cover is detachably arranged on the main body portion to cover the window, and the tool withdrawal knob is movable out of the handle through the window.

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