Follow-up mechanism of cutting stapler and cutting stapler thereof

Abstract

The present invention relates to the field of stapler technology, and in particular to a follower mechanism of a cutting stapler and a cutting stapler thereof, the follower mechanism comprising an extension tube, an actuator seat, an end actuator, a cutting knife assembly and a connecting rod, which utilizes a mounting seat of the end actuator to be slidably mounted on the actuator seat, and a connecting rod is arranged between the extension tube and the mounting seat, so that when the actuator seat deflects left or right, although the pusher member will drive the cutting knife to move forward a certain distance, the connecting rod will also push the mounting seat forward a certain distance relative to the actuator seat to compensate for the distance the cutting knife moves forward, thereby achieving that when the actuator seat swings left or right, the relative position between the cutting knife and the mounting seat is maintained basically unchanged to prevent the cutting knife from firing prematurely and cutting tissue. At the same time, when the actuator seat swings left or right, the pusher member is changed from the traditional large-angle bend in one place to two small-angle bends, thereby making the left and right swing of the actuator seat more labor-saving and flexible.

Description

Technical Field

[0001] The present invention relates to the technical field of staplers, in particular to a follower mechanism of a cutting stapler and the cutting stapler. Background Art

[0002] The intracavitary cutting stapler can be used for severing, resecting and anastomosing digestive tract tissues in laparoscopic and open surgery. It mainly includes an operating handle, an extension tube and an end effector located at the front end of the extension tube. The operating handle can operate the end effector to rotate left and right around the extension tube or swing left and right around the extension tube to adjust the position. After adjusting the position, the operating handle can operate the end effector to close, open, cut and suture. The cutting operation of the end effector is usually completed by a motor driving a pusher through a transmission mechanism, and then the pusher drives the cutting knife forward. By driving the cutting knife forward, the suture nails of the end effector are pushed out and formed, and the cutting of the tissue by the cutting knife is completed at the same time.

[0003] However, when the end effector of the existing cutting stapler swings left and right around the hinge point between it and the extension tube, the pusher member connected to the cutting knife does not bend around the hinge point between the end effector and the extension tube. This causes the cutting knife and the end effector to easily shift relative to each other after the end effector swings, which makes it easy for the cutting knife to fire prematurely. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: in order to solve the problem in the prior art that the cutting knife is easily displaced due to the swing of the end effector, which causes the cutting knife to be easily fired prematurely, a follower mechanism of a cutting stapler and a cutting stapler thereof are now provided.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a follower mechanism of a cutting stapler, comprising:

[0006] Extension tube;

[0007] The actuator seat is hinged to the front end of the extension tube to form a first hinge point;

[0008] The end effector has a mounting base, wherein the mounting base is slidably connected to the actuator base;

[0009] The cutting knife assembly comprises a cutting knife pushing member and a cutting knife fixed to the front end of the cutting knife pushing member, and the cutting knife is movably mounted on the mounting seat;

[0010] And a connecting rod, one end of the connecting rod is hinged to the front end of the extension tube to form a second hinge point, the other end of the connecting rod is hinged to the mounting seat to form a third hinge point, the first hinge point is located between the second hinge point and the third hinge point, a guide groove is provided on the connecting rod, the rear end of the push knife member is located in the extension tube, and the front end of the push knife member reaches the mounting seat after passing through the guide groove.

[0011] Furthermore, both side walls of the guide groove are provided with outwardly arched avoidance sections, and the avoidance sections on both sides of the guide groove are arranged opposite to each other.

[0012] Furthermore, a slide groove is provided on the mounting seat, and the front end of the blade pushing member passes through the guide groove and is embedded in the slide groove.

[0013] Furthermore, the front end of the connecting rod is provided with an annular front protrusion, the mounting seat is provided with a front groove matching the front protrusion, an annular groove is coaxially provided in the front protrusion, and a center column matching the annular groove is coaxially protruded from the bottom of the front groove, the front protrusion is embedded in the front groove, and the center column is embedded in the annular groove.

[0014] Furthermore, a ring-shaped rear protrusion is provided at the rear end of the connecting rod, a mounting plate is fixed in the extension tube, a rear hole matching the rear protrusion is opened on the mounting plate, and the rear protrusion is embedded in the rear hole.

[0015] Furthermore, the execution seat is provided with a mounting groove, and the rear end of the mounting seat is embedded in the mounting groove.

[0016] The present invention also provides a cutting stapler, comprising the following mechanism of the cutting stapler as described above.

[0017] The beneficial effects of the present invention are as follows: the follower mechanism of the cutting stapler of the present invention utilizes the mounting seat of the end actuator to be slidably installed on the actuator seat, and a connecting rod is arranged between the extension tube and the mounting seat, so that when the actuator seat deflects left and right, although the pusher piece will drive the cutting knife to move forward a certain distance, the connecting rod will also push the mounting seat forward a certain distance relative to the actuator seat to compensate for the distance the cutting knife moves forward, thereby achieving that when the actuator seat swings left and right, the relative position between the cutting knife and the mounting seat is maintained basically unchanged to prevent the cutting knife from firing prematurely and cutting the tissue. At the same time, when the actuator seat swings left and right, the pusher piece changes from the traditional large-angle bend in one place to two small-angle bends, thereby making the left and right swing of the actuator seat more labor-saving and flexible, and improving the stability of the actuator seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and examples.

[0019] Figure 1This is a three-dimensional schematic diagram of the follower mechanism of the cutting stapler of the present invention when the actuator seat is in the center position;

[0020] Figure 2 yes Figure 1 A partial enlarged schematic diagram;

[0021] Figure 3 This is a three-dimensional schematic diagram of the follower mechanism of the cutting stapler of the present invention when the actuator seat is swinging;

[0022] Figure 4 yes Figure 3 A partial enlarged schematic diagram of B in the middle;

[0023] Figure 5 This is a schematic diagram of the cutting stapler of the present invention with its actuator seat in the center position after the follower mechanism hides the extension tube;

[0024] Figure 6 yes Figure 5 A partial enlarged schematic diagram of center C;

[0025] Figure 7 This is a schematic diagram of the cutting stapler of the present invention when its actuator base swings after the follower mechanism hides the extension tube;

[0026] Figure 8 yes Figure 7 A partial enlarged schematic diagram of D in the middle;

[0027] Figure 9 is a three-dimensional schematic diagram of the connecting rod in the present invention;

[0028] Figure 10 It is a schematic diagram of the hinge connection between the connecting rod and the mounting plate;

[0029] Figure 11 It is a schematic diagram of the articulation between the connecting rod and the mounting base.

[0030] In the figure: 1, extension tube, 1-1, mounting plate, 1-11, rear hole;

[0031] 2. Execution seat, 2-1, installation slot;

[0032] 3. First hinge point;

[0033] 4. End effector, 4-1. Mounting seat, 4-11. Slide groove, 4-12. Front groove, 4-13. Center column;

[0034] 5. Push knife piece;

[0035] 6. Cutting knife;

[0036] 7. Connecting rod, 7-1. Guide groove, 7-11. Avoidance section, 7-2. Front protrusion, 7-21. Annular groove, 7-3. Rear protrusion;

[0037] 8. Second hinge point;

[0038] 9. The third hinge point. DETAILED DESCRIPTION

[0039] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams that illustrate the basic structure of the present invention only in a schematic manner. Therefore, they only show components relevant to the present invention, and directions and references (e.g., up, down, left, right, etc.) may be used solely to facilitate the description of features in the drawings. The following detailed description is therefore not to be taken in a limiting sense, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0040] like Figure 1-11 As shown, a follower mechanism of a cutting stapler includes an extension tube 1, an execution seat 2, an end effector 4, a cutting knife assembly and a connecting rod 7;

[0041] The actuator base 2 is hinged to the front end of the extension tube 1 to form a first hinge point 3. The first hinge point 3 is the rotation center line between the actuator base 2 and the extension tube 1.

[0042] The end effector 4 has a mounting base 4 - 1 , which is slidably connected to the actuator base 2 ;

[0043] The cutting knife assembly comprises a pusher 5 and a cutting knife 6 fixed at the front end of the pusher 5. The cutting knife 6 is movably mounted on the mounting seat 4-1. The end effector 4 comprises a nail magazine assembly and a nail anvil configured on the mounting seat 4-1. The pusher 5 can be specifically composed of two or more flexible steel sheets stacked together. The rear end of the pusher 5 is fixedly connected to the output end of the transmission mechanism. The input end of the transmission mechanism can be connected to the motor transmission. The motor drives the pusher 5 to move forward and backward through the transmission mechanism, thereby realizing the forward and backward movement of the cutting knife 6. When the cutting knife 6 moves forward, It cuts the tissue and pushes the staples of the staple cartridge assembly to staple the tissue; for example, the transmission mechanism includes a rack provided in the handle assembly, the rear end of the extension tube 1 is connected to the handle assembly, the rack is slidably installed in the handle assembly along the length direction of the extension tube 1, the main shaft of the motor is coaxially fixedly connected to the gear, and the gear is meshed with the rack, so that when the motor drives the gear to rotate, the gear will drive the rack to move back and forth, and the rack is fixedly connected to the rear end of the knife pusher 5, so the cutting knife 6 will move back and forth with the rack, thereby controlling the end effector 4 to cut and suture;

[0044] One end of the connecting rod 7 is hinged to the front end of the extension tube 1 to form a second hinge point 8, and the second hinge point 8 is specifically the rotation center line between the rear end of the connecting rod 7 and the extension tube 1. The other end of the connecting rod 7 is hinged to the mounting seat 4-1 to form a third hinge point 9, and the third hinge point 9 is specifically the rotation center line between the front end of the connecting rod 7 and the mounting seat 4-1. The first hinge point 3 is located between the second hinge point 8 and the third hinge point 9. The first hinge point 3, the second hinge point 8 and the third hinge point 9 are parallel to each other. A guide groove 7-1 is provided on the connecting rod 7. The rear end of the pusher member 5 is located in the extension tube 1, and the front end of the pusher member 5 passes through the guide groove 7-1 and reaches the mounting seat 4-1.

[0045] When the first hinge point 3, the second hinge point 8 and the third hinge point 9 of the follower mechanism of the cutting stapler are in the same plane, the execution base 2 is in the center position; when the execution base 2 swings to the left, the second hinge point 8 and the third hinge point 9 are both located to the left of the first hinge point 3; when the execution base 2 swings to the right, the second hinge point 8 and the third hinge point 9 are both located to the right of the first hinge point 3;

[0046] The follower mechanism of the cutting stapler utilizes the mounting base 4-1 of the end actuator 4 to be slidably mounted on the actuator base 2, and a connecting rod 7 is arranged between the extension tube 1 and the mounting base 4-1, so that when the actuator base 2 deflects left and right, although the pusher member 5 will drive the cutting knife 6 to move forward a certain distance, the connecting rod 7 will also push the mounting base 4-1 to move forward a certain distance relative to the actuator base 2 to compensate for the distance the cutting knife 6 moves forward, thereby achieving that when the actuator base 2 swings left and right, the relative position between the cutting knife 6 and the mounting base 4-1 is maintained basically unchanged to prevent the cutting knife 6 from firing prematurely and cutting the tissue. At the same time, when the actuator base 2 swings left and right, the pusher member 5 changes from the traditional large-angle bend to two small-angle bends (located at both ends of the connecting rod 7), thereby making the left and right swing of the actuator base 2 more labor-saving and flexible, and improving the stability of the actuator base 2.

[0047] As an example, both side walls of the guide groove 7-1 have outward-arched avoidance sections 7-11, and the avoidance sections 7-11 on both sides of the guide groove 7-1 are relatively arranged. The avoidance sections 7-11 can be specifically arc-shaped, and the distance between the avoidance sections 7-11 on both sides of the guide groove 7-1 gradually decreases from the middle to the two ends. In this way, when the execution seat 2 swings left and right, the guide groove 7-1 can better accommodate and abut the bent pusher member 5.

[0048] As an example, a slide groove 4-11 is provided on the mounting seat 4-1, and the front end of the pusher member 5 passes through the guide groove 7-1 and is embedded in the slide groove 4-11, thereby limiting the pusher member 5 so that the pusher member 5 can basically only move forward and backward along the guide groove 7-1.

[0049] like Figure 11As shown, as an example, the front end of the connecting rod 7 is provided with an annular front protrusion 7-2, the mounting seat 4-1 is provided with a front groove 4-12 matching the front protrusion 7-2, the front protrusion 7-2 is coaxially provided with an annular groove 7-21, and the bottom of the front groove 4-12 coaxially protrudes with a center column 4-13 matching the annular groove 7-21, the front protrusion 7-2 is embedded in the front groove 4-12, and the center column 4-13 is embedded in the annular groove 7-21, and the hinge between the connecting rod 7 and the mounting seat 4-1 is realized, the structure is simplified, and the coaxiality and stability of the connection are improved.

[0050] like Figure 10 As shown, as an example, the rear end of the connecting rod 7 is provided with an annular rear protrusion 7-3, and a mounting plate 1-1 is fixed in the extension tube 1. The mounting plate 1-1 is provided with a rear hole 1-11 that matches the rear protrusion 7-3, and the rear protrusion 7-3 is embedded in the rear hole 1-11, thereby realizing the hinge between the connecting rod 7 and the extension tube 1.

[0051] As an example, the execution base 2 is provided with a mounting groove 2 - 1 , and the rear end of the mounting base 4 - 1 is embedded in the mounting groove 2 - 1 , thereby enabling the mounting base 4 - 1 of the end effector 4 to be slidably mounted on the execution base 2 .

[0052] As an example, a cutting and stapling device includes the following mechanism of the cutting and stapling device described above;

[0053] The working principle of the follower mechanism of the above-mentioned cutting stapler is as follows:

[0054] When the end effector 4 swings to the left or right with the actuator base 2, since the rotation center of the connecting rod 7 is not concentric with the first hinge point 3, the connecting rod 7 will push the mounting base 4-1 to move forward a certain distance relative to the actuator base 2, and the pusher piece 5 will bend at the front and rear ends of the connecting rod 7, and will drive the cutting knife 6 to move forward a certain distance. In this way, when the actuator base 2 swings left and right, the relative position between the cutting knife 6 and the mounting base 4-1 can be maintained basically unchanged to prevent the cutting knife 6 from firing prematurely and cutting the tissue. At the same time, when the actuator base 2 swings left and right, the pusher piece 5 changes from the traditional large-angle bend in one place to two small-angle bends, which makes the left and right swing of the actuator base 2 more labor-saving and flexible, and improves the stability of the actuator base 2.

[0055] The above description of the preferred embodiments of the present invention is intended to serve as a guide. Based on the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A follower mechanism for a cutting stapler, characterized in that: include: Extension tube (1); The actuator seat (2) is hinged to the front end of the extension tube (1) to form a first hinge point (3); An end effector (4) has a mounting seat (4-1), wherein the mounting seat (4-1) is slidably connected to the actuator seat (2); A cutting knife assembly comprises a knife pusher (5) and a cutting knife (6) fixed to the front end of the knife pusher (5), wherein the cutting knife (6) is movably mounted on the mounting seat (4-1); and a connecting rod (7), one end of the connecting rod (7) being hinged to the front end of the extension tube (1) to form a second hinge point (8), the other end of the connecting rod (7) being hinged to the mounting seat (4-1) to form a third hinge point (9), the first hinge point (3) being located between the second hinge point (8) and the third hinge point (9), a guide groove (7-1) being provided on the connecting rod (7), the rear end of the pusher member (5) being located in the extension tube (1), and the front end of the pusher member (5) passing through the guide groove (7-1) and reaching the mounting seat (4-1); When the end effector (4) swings leftward or rightward along with the actuator seat (2), the connecting rod (7) pushes the mounting seat (4-1) to move forward a certain distance relative to the actuator seat (2) because the rotation center of the connecting rod (7) is not concentric with the first hinge point (3).

2. The follower mechanism of the cutting stapler according to claim 1, characterized in that: Both side walls of the guide groove (7-1) are provided with outwardly arched avoidance sections (7-11), and the avoidance sections (7-11) on both sides of the guide groove (7-1) are arranged opposite to each other.

3. The follower mechanism of the cutting stapler according to claim 1, characterized in that: A sliding groove (4-11) is provided on the mounting seat (4-1), and the front end of the blade pusher (5) passes through the guide groove (7-1) and is embedded in the sliding groove (4-11).

4. The follower mechanism of the cutting stapler according to claim 1, characterized in that: The front end of the connecting rod (7) is provided with an annular front protrusion (7-2), the mounting seat (4-1) is provided with a front groove (4-12) matching the front protrusion (7-2), an annular groove (7-21) is coaxially provided in the front protrusion (7-2), a center column (4-13) matching the annular groove (7-21) is coaxially protruded from the bottom of the front groove (4-12), the front protrusion (7-2) is embedded in the front groove (4-12), and the center column (4-13) is embedded in the annular groove (7-21).

5. The follower mechanism of the cutting stapler according to claim 1, characterized in that: The rear end of the connecting rod (7) is provided with an annular rear protrusion (7-3), a mounting plate (1-1) is fixed in the extension tube (1), a rear hole (1-11) matching the rear protrusion (7-3) is opened on the mounting plate (1-1), and the rear protrusion (7-3) is embedded in the rear hole (1-11).

6. The follower mechanism of the cutting stapler according to claim 1, characterized in that: The execution seat (2) is provided with a mounting groove (2-1), and the rear end of the mounting seat (4-1) is embedded in the mounting groove (2-1).

7. A cutting stapler, characterized in that: It comprises the follower mechanism of the cutting stapler according to any one of claims 1 to 6.

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