Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a closing driving mechanism and a medical anastomat comprising the same, and the nail head part is slowly opened after the percussion of the anastomat is completed through a unidirectional air damping structure.
The embodiment of the invention provides a closing driving mechanism which is used for a medical anastomat and comprises a closing driving piece, a piston part and a cylinder body, wherein the closing driving piece is connected with the piston part, the piston part is positioned at the proximal end side of the cylinder body, a cavity part is formed by enclosing the inner wall of the cylinder body and the piston part, and a one-way valve is arranged in the cavity part;
When the piston part moves to the proximal end side of the anastomat, the volume of the cavity part is increased, the one-way valve is opened, and the piston part drives the closing driving piece to move to the proximal end side of the anastomat so as to drive the nail head part of the anastomat to be closed;
When the piston part moves to the distal end side of the anastomat, the volume of the cavity part is reduced, the one-way valve is closed, and the piston part drives the closing driving piece to move to the distal end side of the anastomat so as to drive the nail head part of the anastomat to open.
Optionally, the cartridge is part of the stapler housing.
Optionally, the closure driving member and the piston portion are integrally provided as one piece.
Optionally, a first sealing ring is arranged between the outer wall of the piston part and the inner wall of the cylinder.
Optionally, the mechanism further comprises a sleeve, the cylinder and the piston part are both sleeved on the sleeve, and the piston part can move along the axial direction of the sleeve;
A second sealing ring is arranged between the outer wall of the sleeve and the cylinder body.
Optionally, the one-way valve is disposed on a distal side of the barrel.
Optionally, the outer wall of the cylinder is provided with at least one first fixing part, and the shell of the anastomat is provided with a second fixing part matched with the first fixing part.
Optionally, the outer wall of the cylinder is provided with at least one fixing groove, and the shell of the anastomat is provided with a fixing beam matched with the fixing groove;
Or (b)
The outer wall of the cylinder body is provided with at least one fixed beam, and the shell of the anastomat is provided with a fixed groove matched with the fixed beam.
Optionally, the cavity part is further provided with an air hole communicated with air.
Optionally, the piston part further comprises a biasing piece and a pull rope, wherein the biasing piece and the pull rope are respectively connected with the piston part;
When the nail head of the anastomat is driven to be closed, the pull rope pulls the piston part to move towards the proximal end side of the anastomat, and the biasing piece deforms;
when the nail head of the anastomat is driven to open, the piston part moves to the distal end side of the anastomat under the action of the deformation restoring force of the biasing piece.
Optionally, the biasing member is a compression spring disposed on a proximal end side of the piston portion.
Optionally, the closing driving mechanism further comprises a movable handle, a sliding block and a steering supporting beam, the pull rope is sleeved on the steering supporting beam, and two ends of the pull rope are respectively connected with the sliding block and the piston part;
when the movable handle is held in an initial state, the movable handle drives the sliding block to move towards the distal end side of the anastomat, and the sliding block pulls the piston part to move towards the proximal end side of the anastomat through the pull rope.
Optionally, the closing driving mechanism further comprises a holder and an actuating rod, wherein the actuating rod comprises a pressing part, and initial positions of the sliding block and the pressing part are located on the proximal end side of the holder;
when the movable handle is held in an initial state, the movable handle drives the actuating rod to move towards the distal end side of the anastomat, and the pressing part of the actuating rod presses the retainer downwards to be embedded with the sliding block;
After the anastomat is completely fired, the pressing part of the actuating rod does not press the retaining piece any more, the retaining piece moves upwards to be separated from the sliding block, and the piston part moves towards the distal end side of the anastomat under the action of the deformation restoring force of the biasing piece.
The embodiment of the invention also provides a medical anastomat, which comprises the closing driving mechanism.
The closing driving mechanism and the medical anastomat comprising the same provided by the invention have the following advantages:
The invention provides a closing driving mechanism for a medical anastomat, which is additionally provided with a one-way air damping structure, when the nail head is closed and driven, a one-way valve is opened to enable a cavity part to be communicated with external air, a piston part drives a closing driving piece to move towards the proximal end side of the anastomat to drive the nail head to be closed, after the firing of the anastomat is completed, the one-way valve is closed, the piston part moves towards the distal end side of the anastomat to compress air in the cavity part, and the piston part is subjected to resistance of compressed air to slow down the movement, so that the nail head can be slowly opened, and the damage to surrounding tissues due to overlarge jaw opening force is avoided.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings.
FIG. 1 is a schematic view showing a partial structure of a stapler in an initial state according to a first embodiment of the present invention;
FIG. 2 is a schematic view of the stapler housing of FIG. 1 with the stapler housing removed;
FIG. 3 is a schematic view of the structure of FIG. 2 after removal of the cartridge;
FIG. 4 is a schematic view showing the structure of the closing drive mechanism in an initial state according to the first embodiment of the present invention;
Fig. 5 is a schematic view showing the positional relationship of the cylinder and the piston portion in the initial state of the first embodiment of the present invention;
FIG. 6 is a top view of the closure drive mechanism in an initial state of the first embodiment of the present invention;
FIG. 7 is a cross-sectional view taken along the direction A1-A1 in FIG. 6;
FIG. 8 is a schematic view of the positional relationship of the barrel and piston portion during firing of the first embodiment of the present invention;
FIG. 9 is a top view of the closure drive mechanism during firing of the first embodiment of the present invention;
FIG. 10 is a cross-sectional view taken along the direction A2-A2 in FIG. 9;
FIG. 11 is a schematic view of the positional relationship of the barrel and piston portion after firing of the first embodiment of the present invention;
FIG. 12 is a schematic view showing the structure of a closing drive mechanism in an initial state according to a second embodiment of the present invention;
fig. 13 is a schematic view showing the structure of a closing drive mechanism in an initial state of a third embodiment of the present invention;
Fig. 14 is a schematic view of the structure of the closure driving mechanism in the initial state of the fourth embodiment of the present invention;
fig. 15 is a schematic structural view of a closure driving mechanism in an initial state of a fifth embodiment of the present invention.
Reference numerals:
1. second slider of stapler body 42
11. Third slider of fixed handle 43
12. Second compression spring of closing tab 44
13. Shell 51 stay cord
14. Steering support beam with sleeve 52
15. Fixed beam 61 closing drive
2. Actuating lever 62 first seal
21. First compression spring of pressing part 63
22. Firing member 64 piston portion
23. Rack 65 connecting rod
3. Movable handle 71 cylinder
31. Claw 711 fixing groove
32. Second seal of connecting rod 72
41. First slider 73 check valve
411. First groove 74 cavity portion
412. Second groove
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus a repetitive description thereof will be omitted.
In order to solve the technical problems in the prior art, the invention provides a closing driving mechanism for a medical anastomat and the medical anastomat comprising the nail bin. The anastomat comprises a nail head part and an anastomat body, wherein a closing pull piece for closing the nail head part is arranged in the anastomat body. The closing driving mechanism is used for the medical anastomat and comprises a closing driving piece, a piston part and a cylinder body, wherein the closing driving piece is connected with the closing pulling piece and can pull the closing pulling piece to move along the axial direction of the anastomat. The closing drive member and the piston portion may be one member integrally provided, or may be two members separately provided but connected to each other.
The piston part is positioned at the proximal end side of the cylinder body, a cavity part is formed between the inner wall of the cylinder body and the piston part, and the cavity part is provided with a one-way valve, so that the piston part and the cylinder body jointly form an air damping structure. The one-way valve opens when subjected to a force in a first direction so that the cavity portion communicates with the outside air, and closes when subjected to a force in a second direction so that the cavity portion becomes a closed cavity that does not communicate with the outside air.
Before the stapler is fired, the operator needs to close the staple cartridge and anvil to clamp the tissue. At this time, when the piston part moves to the proximal side of the anastomat, as the distance between the distal side wall of the piston part and the distal side wall of the cylinder body increases, the volume of the cavity part increases, the one-way valve is opened by the force of the first direction, and the piston part drives the closing driving piece to move to the proximal side of the anastomat so as to drive the closing pulling piece of the anastomat to move to the proximal side of the anastomat, thereby driving the nail head of the anastomat to be closed. Since the check valve is opened to form an air circulation passage in this process, air is continuously introduced into the cavity portion to fill the increased volume in response to the movement of the piston portion toward the proximal end side, so that the closing process of the head portion of the nail is not hindered.
After the anastomat is completely fired, the piston part moves towards the distal side of the anastomat, and as the distance between the distal side wall of the piston part and the distal side wall of the cylinder body is reduced, the volume of the cavity part is reduced, the one-way valve is closed by the force in the second direction, the piston part drives the closing driving piece to move towards the distal side of the anastomat, and the closing driving piece drives the closing pulling piece to move towards the distal side of the anastomat so as to drive the nail head of the anastomat to be opened. In this process, the one-way valve is closed to enable the cavity part to be a closed cavity, air in the cavity part is compressed along with the reduction of the volume of the cavity part, the movement of the piston part to the distal end side of the anastomat can be subjected to the resistance of compressed air, so that the movement speed of the piston part is slowed down, the nail head part of the anastomat can be slowly opened, and the damage to surrounding tissues caused by the overlarge force of opening the jaw is avoided.
The structure of the closure drive mechanism and stapler according to the embodiments of the present invention will be further described with reference to fig. 1 to 15. Fig. 1 to 11 show a structure of a closing driving mechanism according to a first embodiment of the present invention. In the first embodiment, the closing drive member and the piston portion are one component integrally provided, and thus, in fig. 1 to 11, the closing drive member and the piston portion are each represented by the closing drive member 61, that is, the closing drive member 61 serves as both a component for driving the closing tab and the piston portion of the unidirectional air damping structure. Fig. 12, 13, 14 and 15 show the structure of the closure driving mechanism of the second, third, fourth and fifth embodiments of the present invention, respectively, in which the closure driving member and the piston portion are two separately provided members, respectively denoted as a closure driving member 61 and a piston portion 64.
As shown in fig. 1 to 7, the structure of the closing drive mechanism in the initial state in the first embodiment is shown. The anastomat comprises an anastomat body 1 and a nail head part (not shown in the figure) positioned at the distal end side of the anastomat body 1, wherein the anastomat body 1 comprises a shell 13 and a fixed handle 11, a closing pull piece 12 for closing the nail head part and opening the nail head part is further arranged in the anastomat body 1, the nail head part is opened when the closing pull piece 12 is in an initial state, the nail head part is closed when the closing pull piece 12 moves towards the proximal end side of the anastomat, and the nail head part can be reopened when the closing pull piece 12 moves towards the distal end side of the anastomat.
As shown in fig. 1 to 4, the closing driving mechanism includes a closing driving member 61 and a cylinder 71, wherein a distal end side of the closing driving member 61 is connected with the closing tab 12, and the closing driving member 61 can drive the closing tab 12 to move along an axial direction of the anastomat. The closure driver 61 is located on the proximal side of the barrel 71 and the closure driver 61 is located at least partially inside the barrel 71. A cavity 74 is defined between the inner wall of the cylinder 71 and the closing driving element 61, and the cavity 74 is provided with a check valve 73. In this embodiment, the check valve 73 is provided on the distal end side of the cylinder 71. The one-way valve 73 is opened when the one-way valve 73 receives a force from the distal side of the stapler to the proximal side, and the one-way valve 73 is closed when the one-way valve 73 receives a force from the proximal side of the stapler to the distal side.
In the present invention, the distal side and the proximal side are relative to the operator, wherein the distal side refers to the end farther from the operator and the proximal side refers to the end nearer to the operator. The upward or upward direction is directed towards the side facing away from the rack 23 with respect to the actuating lever 2, and the downward or downward direction is opposite thereto. For example, in the view of fig. 1, the distal side of the stapler body 1 is the left end in the drawing, the proximal side of the stapler body 1 is the right end in the drawing, and in the view of fig. 1 and 2, the upward direction means the upper end in the drawing. As shown in fig. 1 and 5, the closure driving mechanism further includes a sleeve 14, and the closure tab 12 is disposed inside the sleeve 14. The sleeve 14 extends in the axial direction of the stapler. The cylinder 71 and the closing drive 61 are both sleeved outside the sleeve 14. As shown in fig. 1 and 2, in this embodiment, the outer wall of the cylinder 71 is provided with at least one fixing groove 711, and the housing 13 of the stapler is provided with a fixing beam 15 cooperating with the fixing groove 711, so as to keep the position of the cylinder 71 stable relative to the housing 13 during operation of the stapler. In other alternative embodiments, at least one fixing beam may be provided on the outer wall of the cylinder 71, and the housing 13 of the stapler may be provided with a fixing groove matched with the fixing beam, so as to fix the cylinder 71. In other alternative embodiments, a fixing groove may be formed on the outer wall of the barrel 71, and a matching fixing beam may be formed on the housing 13 of the anastomat, or the barrel 71 and the housing 13 may be relatively fixed by adopting other fixing structures, such as a matching boss and a matching groove. In addition, in other alternative embodiments, the cylinder 71 may not be fixed to the housing 13, but may be movably disposed in the housing 13 of the stapler, or the cylinder 71 may be fixed to the sleeve 14, which falls within the scope of the present invention. The cylinder 71 may also be a part of the housing 13, that is, the cylinder 71 is integrally formed with the housing 13, in this embodiment, the housing 13 is divided into two parts, that is, a first housing 13 and a second housing (not shown in the figure), and accordingly, the cylinder 71 includes a first cylinder disposed on the first housing 13 and a second cylinder disposed on the second housing, and when the first housing 13 and the second housing are fastened together, the first cylinder and the second cylinder are fastened together to form the corresponding cylinder 71.
As shown in fig. 3, in order to achieve a better sealing effect between the outer wall of the closing driving means 61 and the inner wall of the cylinder 71, a first sealing means 62, in particular a first sealing ring 62, is preferably provided between the outer wall of the closing driving means 61 and the inner wall of the cylinder 71, and the first sealing ring 62 may be made of a flexible material such as rubber or plastic. In other alternative embodiments of the present invention, the first seal ring 62 may be omitted, and one of the closure driving member 61 and the cylinder 71 may be made of a flexible material, so as to achieve sealing engagement between the inner wall of the cylinder 71 and the outer wall of the closure driving member 61. The first sealing ring 62 is provided, or one of the closing driving member 61 and the cylinder 71 is made of flexible material, so that not only can the sealing function be achieved, but also the friction force during the relative movement between the closing driving member 61 and the cylinder 71 can be increased, and the jaw opening and closing process is relaxed and stable.
As shown in fig. 5, further, in order to better realize the sealing of the cavity 74, the cylinder 71 is connected with the sleeve 14 in a sealing manner, and a second sealing member 72, specifically, a second sealing ring 72, is preferably disposed between the outer wall of the sleeve 14 and the inner wall of the opening where the cylinder 71 is sleeved on the sleeve 14, and the second sealing ring 72 may be made of a flexible material such as rubber or plastic.
As shown in fig. 5 to 7, the closing driving mechanism further includes a movable handle 3, a biasing member, a pull rope 51, a steering support beam 52, and a first slider 41, and in order to reduce the resistance when the pull rope 51 moves, the steering support beam 52 preferably adopts a pulley structure. The biasing member provides a biasing force to the closure driving member 61 towards the distal side of the stapler. In this embodiment, the biasing member is a first compression spring 63 disposed on the proximal end side of the closing driving member 61, and in other alternative embodiments, the biasing member may be a tension spring, a spring plate, or the like, but is not limited thereto.
The side surface of the first slider 41 is provided with a second groove 412, one end of the pull rope 51 is disposed in the second groove 412, and the other end of the pull rope 51 is fixed to the closing driving piece 61, so that the first slider 41 and the closing driving piece 61 are linked. Further, after the transmission of the movement of the first slider 41 to the closing driver 61 is achieved by the steering support beam 52, the movement direction of the first slider 41 is opposite to the movement direction of the closing driver 61.
As shown in fig. 5, the closure driving mechanism further comprises a holder and an actuating rod 2, the actuating rod 2 extending in the axial direction of the stapler. The holder comprises a second slider 42 and a third slider 43, a second compression spring 44 being arranged below the third slider 43. The actuating lever 2 includes a pressing portion 21 and a firing member 22, and in an initial state, initial positions of the first slider 41 and the pressing portion 21 are both located on a proximal end side of the holder.
As shown in fig. 8 to 10, in the first embodiment, the structure of the closing driving mechanism is shown when the nail head of the stapler is driven to close. In this embodiment, in the initial state, the movable handle 3 is held, the movable handle 3 drives the first slider 41 to move to the distal side of the stapler via the link 32, and at the same time, the movable handle 3 drives the actuating lever 2 to move to the distal side of the stapler via the claw 31.
When the first slider 41 moves towards the distal end side of the anastomat, the pull rope 51 pulls the closing driving piece 61 to move towards the proximal end side of the anastomat, the closing driving piece 61 presses the first pressure spring 63 to generate compression deformation, and the closing driving piece 61 simultaneously drives the closing pull piece 12 to move towards the proximal end side of the anastomat so as to drive the nail head to be closed.
In the closing process of the nail head, as the distance between the distal side wall of the closing driving member 61 and the distal side wall of the cylinder 71 gradually increases along with the movement of the closing driving member 61 to the distal side, the volume of the cavity 74 enclosed by the closing driving member 61 and the cylinder 71 gradually increases, and the one-way valve 73 is opened by the force in the direction of the proximal side of the stapler, so as to form a communication channel between the cavity 74 and the outside air. Thus, the unidirectional air damping structure does not impede the movement of the closure driver 61 during closing of the head, and the head can be normally closed to clamp tissue.
As shown in fig. 8, when the head is closed, the first slider 41 moves below the holder, while the pressing portion 21 (not shown in this figure) of the actuating lever 2 contacts the upper side of the third slider 43 in the holder and presses the third slider 43 downward, so that the second slider 42 in the third slider 43 partially enters the first recess 411 in the upper surface of the first slider 41 to maintain the stability of the position of the first slider 41 during firing of the stapler. At this time, the second compression spring 44 is compressively deformed by the third slider 43. In this process, due to the restoring force of the first slider 41 to the deformation of the first compression spring 63 by the pulling force of the pull cord 51 on the closure driving member 61 in the direction toward the proximal end of the stapler, the closure driving member 61 is maintained in the position in fig. 10 by the pulling of the pull cord 51, thereby maintaining the stability of the closing of the nail head during firing of the stapler.
The engagement between the first slider 41 and the retainer is only one embodiment, and in other alternative embodiments, an upwardly concave groove may be provided on the lower surface of the retainer, and when the pressing portion 21 of the actuating lever 2 presses the retainer downward, the retainer moves downward so that the upper end of the first slider 41 enters the groove of the retainer, thereby realizing the engagement between the retainer and the first slider 41.
As shown in FIG. 11, in a first embodiment, the configuration of the closure drive mechanism is shown after firing of the stapler is completed. At this time, the pressing portion 21 (not shown in the drawing) of the actuating lever 2 no longer presses the third slider 43 downward, and the third slider 43 moves upward under the deformation restoring force of the second compression spring 44, thereby driving the second slider 42 to move upward to disengage from the first groove 411 of the first slider 41. The first slider 41 loses the holding action of the holding element and is free to move without exerting any pulling force on the closure driving element 61 towards the proximal side of the stapler. At this time, under the action of the deformation restoring force of the first compression spring 63, the closing driving member 61 moves toward the distal end side of the stapler, and drives the closing tab 12 to move toward the distal end side of the stapler, so as to drive the nail head of the stapler to open.
During the opening of the nail head of the stapler, as the closing driver 61 moves to the distal side of the stapler, the distance between the distal side wall of the closing driver 61 and the distal side wall of the cylinder 71 gradually decreases, the volume of the cavity 74 gradually decreases, and the check valve 73 is closed by a force directed to the distal side of the stapler. At this time, the hollow portion 74 is not communicated with the outside air, the air is gradually compressed with the volume of the hollow portion 74 reduced, the movement of the closing driver 61 to the distal end side of the stapler is resisted by the compressed air, so that the movement speed of the closing driver 61 is slowed down, and the nail head of the stapler is slowly opened. In other alternative embodiments, the side wall of the cavity 74 may be further provided with a small air hole communicating with air, which can be discharged to the outside only very slowly when the volume of the cavity 74 is reduced, however, the discharging speed of the small air hole is not higher than the compressed speed of the air, so that the air still generates resistance to the movement of the closure driving member 61 to the distal side.
In addition, since the first sealing ring 62 is arranged between the outer wall of the closing driving element 61 and the inner wall of the cylinder 71, the contact surface of the first sealing ring 62 and the cylinder 71 has certain damping to the movement of the closing driving element 61 towards the distal end side of the anastomat, which is more beneficial to slowing down the movement speed of the closing driving element 61.
Fig. 12 to 15 are schematic structural views of a closing driving mechanism according to a second embodiment, a third embodiment, a fourth embodiment and a fifth embodiment of the present invention. The four embodiments differ from the first embodiment in that the piston portion 64 and the closure driving member 61 are provided separately as two mutually connected components. The piston portion 64 is located on the proximal side of the barrel 71, the size of the piston portion 64 cooperates with the size of the inner wall of the barrel 71 to form a sealed connection with the barrel 71, and the shape and size of the closure driving member 61 is not limited to the shape and size shown in fig. 14, as long as it is sufficient to transmit the movement of the piston portion 64 to the closure tab 12.
As shown in fig. 12, in the second embodiment, the closure driving member 61 is located in the cavity portion of the cylinder 71, and the closure driving member 61 is fixedly connected to the piston portion 64, the closure driving member 61 is connected to the pull tab 12, and the piston portion 64 is connected to the pull cord 51. The size of the closure drive member 61 may be small relative to the piston portion 64, whereby the closure drive member 61 does not form a sealing connection with the barrel 71, whereas the side wall of the piston portion 64 forms a sealing connection with the inner wall of the barrel 71, and movement of the closure drive member 61 in the cavity portion does not affect the volume change of the cavity portion itself, whereas only movement of the piston portion 64 towards the distal side of the stapler and the proximal side of the stapler causes a decrease and an increase of the volume of the cavity portion. The piston 64 may be made of flexible material or the first sealing ring 62 may be provided between the piston 64 and the inner wall of the cylinder 71, so that not only sealing effect is achieved, but also friction force during relative movement between the piston 64 and the cylinder 71 is increased, and the jaw opening and closing process is relaxed and stable.
When the piston portion 64 moves towards the proximal end of the stapler under the action of the pull cord 51, the volume of the cavity portion increases due to the increase of the distance between the distal side wall of the piston portion 64 and the distal side wall of the cylinder 71, the one-way valve 73 is opened by the force towards the proximal end, and the piston portion 64 drives the closing driving member 61 to move towards the proximal end of the stapler so as to drive the closing tab 12 of the stapler to move towards the proximal end of the stapler, thereby driving the nail head of the stapler to close, and simultaneously, the piston portion 64 compresses the first pressure spring 63 at the proximal end to deform. When the piston portion 64 moves to the distal side of the stapler under the action of the deformation restoring force of the first compression spring 63, the distance between the distal side wall of the piston portion 64 and the distal side wall of the cylinder 71 is reduced, at this time, the volume of the cavity portion is reduced, the one-way valve 73 is closed by the force towards the distal side, the piston portion 64 drives the closing driver 61 to move to the distal side of the stapler, and the closing driver 61 drives the closing tab 12 to move to the distal side of the stapler, so as to drive the nail head of the stapler to open. In this process, the air in the cavity is compressed as the volume of the cavity decreases, and the movement of the piston portion 64 to the distal side of the stapler is resisted by the compressed air, thereby slowing down the movement speed of the piston portion, so that the stapling head of the stapler can be slowly opened, and the damage to surrounding tissues caused by excessive force of opening the jaws is avoided.
As shown in fig. 13, in the third embodiment, the difference from the second embodiment is that the closing drive member 61 is located on the distal end side of the cylinder 71, and the closing drive member 61 and the piston portion 64 are connected by the connecting rod 65, and since the closing drive member 61 is outside the cylinder 71, the movement of the closing drive member 61 does not affect the volume of the cavity portion. As shown in fig. 14, in the fourth embodiment, the difference from the third embodiment is that the first compression spring 63 is not provided on the proximal end side of the piston portion 64, but is provided between the proximal end side of the closure driving piece 61 and the cylinder 71, and may be fitted over the connection rod 65. Similarly, when the piston portion 64 moves proximally, the closure driving member 61 is pulled to move proximally, and the closure driving member 61 compresses the first compression spring 63 to deform. After the pulling force of the pulling cord 51 applied to the piston portion 64 to the proximal side is removed, the closure driving member 61 is moved to the distal side by the deformation restoring force of the first compression spring 63, and the pulling piece 12 and the piston portion 64 are driven to move to the distal side.
Fig. 15 is a schematic structural view of a closing driving mechanism according to a fifth embodiment of the present invention. This embodiment differs from the two embodiments shown in fig. 12-13 in that the pull tab 12 and the piston portion 64 are not coaxially disposed and the closure driving member 61 may be fixedly coupled to the side wall of the piston portion 64. In this embodiment, the operation principle of the closing drive member 61 and the piston portion 64 is the same as that of the embodiment shown in fig. 12 and 13, and will not be described here. In the fifth embodiment, the cylinder 71 and the piston portion 64 may be provided in at least two groups, the closing driving means 61 is fixedly connected to a plurality of the piston portions 64 at the same time, and a plurality of the check valves 73 are provided in the cavity portions 74 of the respective cylinders 71.
The closing driving mechanism and the medical anastomat comprising the same provided by the invention have the following advantages:
The invention provides a closing driving mechanism for a medical anastomat, which is additionally provided with a one-way air damping structure, when the nail head is closed and driven, a one-way valve is opened to enable a cavity part to be communicated with external air, a piston part drives a closing driving piece to move towards the proximal end side of the anastomat to drive the nail head to be closed, after the firing of the anastomat is completed, the one-way valve is closed, the piston part moves towards the distal end side of the anastomat to compress air in the cavity part, and the piston part is subjected to resistance of compressed air to slow down the movement, so that the nail head can be slowly opened, and the damage to surrounding tissues due to overlarge jaw opening force is avoided.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.