WO2014048057A1

WO2014048057A1 - Driving and locking apparatus and cutting stapler using same

Info

Publication number: WO2014048057A1
Application number: PCT/CN2013/000937
Authority: WO
Inventors: 李学军; 刘青
Original assignee: 北京中法派尔特医疗设备有限公司
Priority date: 2012-09-29
Filing date: 2013-08-09
Publication date: 2014-04-03
Also published as: CN102846346B; CN102846346A

Abstract

Disclosed are a driving and locking apparatus (4) and a cutting stapler using the apparatus (4). The apparatus (4) comprises a fixing base (41), a driving ejector pin (42), a locking pushing block (43) and a locking wedging block (44), wherein the driving ejector pin (42) is mounted on the fixing base (41) in such a way as to slide along its axis, and is mounted with a pressure spring (46). A spring (47) is mounted between the locking wedging block (44) and the locking pushing block (43), the locking wedging block (44) and the locking pushing block (43) are slidably mounted on the fixing base (41), and when the pressure spring (46) is released, the locking wedging block (44) can slide between the driving ejector pin (42) and the fixing base (41). A staple bin assembly of the cutting stapler comprises a staple bin (1), a knife sliding block (2), a knife-carrying rack (3) and the abovementioned apparatus (4). The top end of the driving ejector pin (42) abuts against the knife-carrying rack (3), and compresses the pressure spring (46) along with the pushing action of the knife-carrying rack (3). The locking pushing block (43) corresponds to the cutting stop position of the knife sliding block (2). The structural design is rational, and the structure is compact. After impact, the staple bin (1) can automatically lock, preventing a second impact, and preventing the staple bin assembly from being misused, making the apparatus safe. The normal running of surgical operations can be ensured, and thus the apparatus is suitable for a wide range of uses.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to the field of medical device technology, and in particular to a driving and locking device and a cutting stapler using the same. BACKGROUND OF THE INVENTION In surgical procedures, medical staplers have become an indispensable auxiliary medical device in the process of suturing human tissue. With the development of medicine and the development of medical device products, more and more staple products are used in clinical practice, and their application scope has been related to gastrointestinal surgery, hepatobiliary surgery, thoracic surgery, urology, gynecology and so on. The field is one of the essential tools for doctors. The application of the medical stapler makes the operation less bleeding, shorter operation time, and has many advantages such as reducing manual operation errors, avoiding infection, and promoting postoperative functional recovery. A commonly used product in medical stapler is a linear cutting stapler, which is mainly used for suturing the opening of the cavity tissue, the suture mouth is neat and very firm, and the bleeding of the suture is not easy to occur. The original linear suturing device only has the function of suturing. After the tissue is sutured, the doctor needs to manually cut off the excess tissue, and the doctor does not easily grasp the distance between the cutting line and the suture. Therefore, the cutting line is often not neat and leaks. The risk of blood is enormous. For the surgery of special parts of the human body, a suture device directly with a cutter has been developed, such as Kai Tuo produced by Johnson & Johnson, which compensates for the shortcomings of the linear suture device to some extent, and can complete the suturing and cutting action at the same time. The instrument has a long rod and a grip and a trigger for the doctor to operate. Compared with the traditional linear suturing device, the device can greatly save the doctor's operation time, reduce the amount of bleeding, and improve the success rate of the operation. However, the existing suture device with a cutter is designed on the basis of the original linear suturing device, and a cutter is fixed in the middle of the two rows of staples, and the cutting direction of the cutter is perpendicular to the direction of the suture. Under the action of the thrust, the cutter makes a single longitudinal movement together with the pusher piece in the direction of the abutment, and cuts the tissue by the instantaneous thrust of the longitudinal direction. The advantage of the suturing device is that the structure is simple, and the disadvantage is that it is laborious to cut the tissue, the cutting edge is not neat, and the staple is easy to incline in the direction of the cutter, so that the staple molding is poor, the suture opening is easy to leak and the device is fired. Can not lock and other defects. It can be seen that the above-mentioned existing cutting and stitching device obviously has obvious defects and defects in structure and use, and needs to be further improved. Therefore, how to create a cutting and stapling device with smaller firing force, better staple forming, and prevention of secondary mis-striking and safety insurance is one of the most important research and development topics. SUMMARY OF THE INVENTION The technical problem to be solved by the present invention is to provide a driving and locking device and a cutting and stitching device using the same, which have a reasonable design and a compact structure. After the firing is completed, the staple cartridge can be automatically locked, which can prevent the second time. The firing prevents the used cartridge assembly from being misused, thereby overcoming the deficiencies of the prior art. In order to solve the above technical problem, the present invention provides a driving and locking device, comprising a fixed base, a driving ejector, a locking push block and a locking block, wherein: the bottom of the driving ram is connected to the fixed base by a compression spring; A spring is mounted between the locking block and the locking push block, and the locking block and the locking push block are slidably mounted on the fixed base. When the compression spring is relaxed, the locking block can slide to the driving ejector and Between the fixed bases. As a further improvement of the present invention, the fixed base side is a receiving cavity, and the other side is a locking push block sliding groove, and is disposed on a dividing surface between the receiving cavity and the locking push block sliding groove. a through hole; the locking block is provided with a stud, and the driving ejector and the locking block are located In the cavity, the stud of the locking block passes through the through hole of the fixed base, and is connected by a spring to the locking push block in the sliding groove of the locking push block. Further comprising a fixing rod: the protruding post is provided with a through hole along the central axis thereof, and opposite locking step is provided in the through hole; the locking pushing block is provided with a counterbore; the fixing rod passes through Locking the counterbore of the push block, the spring and the stud of the locking block, one end of the plug is opposite to the counterbore of the locking push block, and the other end is provided with the opposite card and the card in the stud of the locking block The steps are offset. The bottom of the locking sliding block sliding groove is provided with a guiding groove, and a limiting protrusion is arranged in the guiding groove; the bottom of the locking pushing block is provided with a guiding strip corresponding to the guiding groove, and is provided with

The protrusion corresponding to the P-clamp bump. The inner cavity of the bottom of the driving ram is open, and the bottom of the outer wall is provided with an opposite protrusion; the accommodating cavity is provided with a central rod corresponding to the inner cavity of the driving ejector, and is provided on the inner wall The corresponding sliding groove of the ejector pin is mounted; the compression spring is installed in the inner cavity of the driving ejector and is fitted on the central rod of the accommodating cavity. The spring is a conical spring, and the small diameter end thereof is opposite to the locking block, and the large diameter end is opposite to the locking push block. The outer end of the locking push block is provided with a wedge surface. In addition, the present invention also provides a cutting stapler comprising a jaw, an abutment assembly, a cartridge assembly, a propulsion mechanism and a firing mechanism, wherein: the cartridge assembly comprises a staple cartridge, a cutter slider, a blade with a blade, And the driving and locking device; the top end of the driving ram of the driving and locking device is opposite to the belt of the belt, and the compression spring is driven by the pushing motion of the belt; the locking of the driving and locking device The push block corresponds to the cutting end position of the cutter slider, and moves to the inside of the fixed base by the action of the cutter slider when the cutting is completed. As a further improvement of the present invention, the cutter slider includes a cutter and a firing piece disposed on both sides of the cutter, and is provided with a rib on the outer wall of the firing piece; the cartridge assembly further includes a fixing to the jaw a fixed clamping plate and a retaining spline corresponding to the rib of the cutter slider on the fixing clamping plate; the cutting blade has a guiding groove thereon, and is slidably mounted on the fixing clamping plate by the pin on. A toothed piece is mounted between the strip and the cutter block, and the tooth piece is connected to the cutter block by a spring and a pin shaft and a sliding groove structure perpendicular to the cutting direction, and the lower edge is a tooth with a cutter Match the ratchets. After the above design, the present invention has the following beneficial effects compared with the prior art: The invention has reasonable design and compact structure, and after the firing is completed, the staple cartridge can be automatically locked to prevent secondary firing and prevent the used cartridge assembly. Misuse, safety insurance, can ensure normal operation, so it is more suitable for promotion. At the same time, the driving and locking device can be arranged on the replaceable or non-replaceable instrument of the staple cartridge, or on other parts that need to be automatically driven and self-locked. The technical solution of the present invention will be further described in detail below through the accompanying drawings and embodiments. The invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view showing the structure of a driving and locking device of the present invention. 2 is a schematic exploded view of the driving and locking device of the present invention. 3 is a schematic view showing the structure of a fixed base of the driving and locking device of the present invention. 4 is a schematic view showing the structure of a driving jack of the driving and locking device of the present invention. Figure 5 is a schematic view showing the structure of the locking block of the driving and locking device of the present invention. Figure 6 is a schematic view showing the structure of the locking push block of the driving and locking device of the present invention. Figure 7 is a schematic view showing the structure of the fixing rod of the driving and locking device of the present invention. Figure 8 is a schematic view showing the structure of the cutting stapler of the present invention. Figure 9 is a schematic view showing the structure of a staple cartridge assembly of the cutting stapler of the present invention. Figure 10 is a schematic view showing the external structure of a cutter slider of the cutting stapler of the present invention. Figure 11 is a cross-sectional structural view showing a cutter slider of the cutting stapler of the present invention. Figure 12 is a schematic view showing the structure of a fixing splint of the cutting stapler of the present invention. Figure 13 is a schematic view showing the structure of a blade with a cutting stapler of the present invention. Figure 14 is a schematic view showing the state of the cartridge assembly when the cutting stapler of the present invention completes the cutting. Figure 15 is a view showing the state of the cartridge assembly after the blade retracting of the cutting stapler of the present invention

Fig. 16 is a partially enlarged schematic view of Fig. 15; 1 and FIG. 1 , the driving and locking device of the present invention comprises a fixed base 41 , a driving ram 42 , a locking push block 43 and a locking block 44 . The bottom of the driving ram 42 is connected to the fixed base 41 by a compression spring 46, and is slidable along the axis by the external force and the compression spring 46. A push spring 47 is mounted between the locking block 44 and the locking push block 43. The locking block 44 and the locking push block 43 are slidably mounted on the fixed base 41. When the compression spring 46 is relaxed, the locking card is locked. Block 44 can be slid to the drive ram 42 is between the fixed base 41. Preferably, the locking block 44 can adopt a plate body structure parallel to the driving ejector 42. The spring direction of the push spring 47 is perpendicular to the plate body structure, and the sliding direction of the locking block 44 and the locking push block 43 is locked. It is also perpendicular to the locking block 44 and the drive ram 42. Further, as shown in FIG. 3, the fixed base 41 can be designed to have a receiving cavity on one side and a sliding groove of the push block on the other side, and slide in the receiving cavity and the locking push block. A through hole 413 is provided in the dividing surface between the grooves. Further, a central rod 411 may be disposed in the accommodating cavity along the axial direction of the driving ram. The central rod 411 preferably has a large semicircular cross section for splicing the compression spring 46. A sliding groove 412 may also be respectively disposed on the front and rear sides of the accommodating cavity. The sliding block sliding groove can be formed by extending the front and rear surfaces of the fixed base 41 and the bottom surface, and the guiding groove 414 can be respectively disposed at the bottom of the front and rear sides of the locking sliding block sliding groove as the sliding of the locking push block 43. The rails are provided with limit projections 415 in the guide slots. Referring to FIG. 4, the driving ram 42 of the present invention can also adopt a rectangular cylindrical structure with a lumen 421, and the inner cavity 421 has a closed top end and a bottom end opening, and the compression spring 46 is matched with the accommodating cavity structure. That is, it is installed in the inner cavity 421 and is fitted on the center rod 411 of the accommodating cavity. In addition, a protrusion 422 corresponding to the sliding slot 412 may be disposed at the bottom of the outer wall of the driving top cymbal 42. When the driving ram 42 slides up and down relative to the fixed base 41, the sliding slot 412 and the protrusion 422 are limited and guided. effect. As shown in FIG. 5, the locking block 44 is provided with a protrusion 442 in the middle of the body 441. The body 441 of the locking block 44 is located in the receiving cavity of the fixed base 41, and the protruding post 442 passes through the fixed base. a through hole 413 of 41, and sliding by the push spring 47 and the locking push block The locking push blocks 43 in the slots are connected. Referring to FIG. 6, the outer end of the locking push block 43 (ie, the end opposite to the fixed base 41, the right side shown in the figure) can be set as a wedge surface 435, and can be set at the bottom of the front and rear sides. There is a pair of guide strips 431 corresponding to the guide grooves 414 of the fixed base 41. A pair of protrusions 432 corresponding to the limit projections 415 are provided on the guide strips 431 for locking the travel limit of the push block 43. Further, as shown in FIG. 5, FIG. 6, and FIG. 7, the protruding post 442 of the locking block 44 is further provided with a through hole along the central axis thereof, and a pair of latching steps 443 are correspondingly arranged in the through hole. . Corresponding to the boss 442 of the locking block 44 and the through hole thereof, the upper end of the locking push block 43 is also provided with a counterbore 433, and a small diameter circular hole 434 is disposed in the counterbore 433. At this time, the fixing lever 45 can be used to connect the locking block 44 and the locking push block 43. The fixing rod 45 passes through the circular hole 434 in the counterbore of the upper end of the locking push block 43, the push spring 47 and the boss 442 of the locking block. The "end end of the fixing rod 45 is the plug 452 and the locking push block 43". The counterbore 433 is opposite to each other, and the other end is provided with an opposite card base 451, which can be inserted into the boss 442 of the locking block 44, and the fixing rod 45 is rotated 90° clockwise or counterclockwise to lock the block protrusion 442. The card step 443 and the card table 451 at the left end of the fixing rod 45 form a card position, and the two are fixedly connected. The installation process of the driving and locking device of the present invention will be described below with reference to the orientations shown in Figs. During the installation, the compression spring 46 is firstly sleeved on the central rod 411 of the fixed base 41, and the driving plunger 42 is mounted in the accommodating cavity of the fixed base 41. The compression spring 46 extends into the inner cavity 421 of the driving ram 42. The driving ram 42 is engaged with the sliding groove 412 of the fixed base 41 by a pair of protrusions 422, and can slide up and down in the axial direction thereof relative to the fixed base 41. When the driving ram 42 receives a downward force, the driving The jack 42 compresses the compression spring 46 and moves downward, When the external force disappears, the driving ram 42 moves upward by the restoring force of the compression spring 46 to return to the initial position. Next, the locking block 44 is vertically inserted into the accommodating cavity of the fixed base 41, and the protruding post 442 on the locking block 44 is passed through the through hole 413 of the fixed base. Then, the locking push block 43 is mounted and positioned along the right side of the fixed base 41 along the guiding groove 414, and a push spring 47 is mounted between the locking push block 43 and the locking block 44, preferably as shown in the figure. The spring 47, the small diameter end of the tapered push spring 47 abuts against the boss 442 of the locking block 44, and the large diameter end abuts against the back surface of the counterbore 433 of the locking push block 43. Finally, the fixing rod 45 is sequentially passed from the left to the right through the circular hole 434 in the locking pusher counterbore 433, the push spring 47, and into the stud 442 of the locking block 44, and then clockwise or counterclockwise. Rotating by 90°, the locking block 44 forms a latching position by the latching step 443 provided in the stud and the card 451 at the left end of the fixing rod 45, thereby fixing the fixing base 41, the locking block 44, the push spring 47 and the pin The push block 43 is fixedly connected. In use, in the initial position, the protrusion 432 provided on the locking push block 43 and the right end surface of the limiting protrusion 415 of the fixed base 41 are abutted, and when the force is not applied, the locking block 44 and the locking push block 43 are locked. Keep it relatively fixed. When the wedge surface 435 of the locking push block 43 receives a leftward force, the locking push block 43 slides to the left along the guiding groove 414 provided on the fixed base 41, thereby pushing the locking by the fixing rod 45 and the push spring 47. The block 44 moves to the left, and the protrusion 432 moves to the left end of the limit projection 415, and is not retracted to the right by the interference of the left end surface of the projection 415. Referring to FIG. 8 , a cutting stapler applying the above driving and locking device comprises a jaw, an abutment assembly, a cartridge assembly, a propulsion mechanism and a firing mechanism, wherein the anvil assembly and the nail are provided. The cartridge assembly is correspondingly mounted in the jaws, and the cartridge assembly is coupled to the front end of the propulsion mechanism. Referring to FIG. 9, the cartridge assembly of the cutting stapler of the present invention comprises a staple cartridge 1, a cutter slider 2, a bladed rack 3, and a drive and pinning device 4 of the present invention. Wherein, the top end of the driving ram 42 of the driving and locking device 4 is in contact with the left end of the belt 63, and the compression spring 46 is compressed along with the advancement of the blade 3, and the clamping block 43 and the cutter slider 2 are locked. The cutting end position corresponds to, and when the cutting is completed, it is moved toward the inside of the fixed base 41 by the force of the cutter slider 2. Referring to FIG. 10 and FIG. 11 , a cutter 21 is disposed in the upper middle of the cutter slider 2 , and a firing piece 22 is disposed on both sides of the cutter 21 , and a rib 221 is disposed on the outer wall of the firing piece. Wherein, the cutter 21 preferably uses a one-sided blade surface; the firing piece 22 adopts a polygonal structure to act as a pusher to push the nail piece and fire the staple. The cutter 21 and the firing piece 22 are parallel to each other and have a "mountain" shape structure. Further, inside the positioning chamber 23 formed by the downward extension of the firing piece 22, a tooth piece 24 as shown in the drawing can also be mounted. The lower end of the tooth piece 24 is provided with a ratchet tooth 242, and the upper end is provided with a columnar hole 241. Two sliding grooves 243 are formed on both sides of the columnar hole 241. A pin 25 is formed in the positioning cavity 23 of the cutter block 2 to cooperate with the sliding groove 243 formed on the tooth piece 24, and a spring 26 is mounted between the cutter block positioning cavity 23 and the toothed column hole 241. The sheet 24 is connected to the cutter slider 2 via a spring 26, a pin shaft 25, and a sliding groove 243, and is movable up and down in the positioning chamber 23. Referring to Figure 12, the cartridge assembly can also include a retaining clip 5 that is fixedly coupled to the jaws. The fixing plate 5 includes two parallel plates, and the upper half of the fixing plate 5 is provided with the inverted teeth 51 which cooperate with the ribs 221 of the cutter slider 2 to prevent the retraction, and the lower half of the front and rear plates are symmetrically provided with pin holes 55, 56, 57, 58. The fixing splint 5 can be made of plastic material, and two hooks 53 are respectively arranged on the outer side of the fixing splint 5. The fixing splint 5 is fitted with the staple cartridge 1 through the hook 53 to prevent the inner component from moving downward; the two sides of the fixing splint 5 are also Corresponding to two vertical ridges 54 to prevent internal The components are swayed to the left and right for fitting with the staple cartridge 1, and a pair of vertical grooves 52 are further provided on both sides of the fixing clamp 5. Referring to FIG. 13, the upper end of the blade strip 3 is provided with teeth 31 that engage with the ratchet teeth 242 of the tooth piece 24, and can move the cutter slider 2 to the left. In addition, the belt 63 is provided with a curved or oblique guiding groove 32 to ensure that the belt 6 is moved in the vertical direction, and the two horizontal grooves 34 and 35 provided on the blade are used to ensure The belt rack 3 is horizontally moved to the left and right, and the other two horizontal grooves 33, 36 are used for fitting the positioning pin in the pin hole of the fixed blade and the fixing pin. The installation and use process of the cutting stapler of the present invention will be described below with reference to the orientation shown in Figs. When installing the cartridge assembly, first, the blade strip 3 is sandwiched between the fixing plates 5 on both sides, and the horizontal grooves 34, 35 on the blade rack 3 and the pin holes 55, 56 on the fixing plate 5 are installed correspondingly. Slide pin, and corresponding sliding pin is mounted on the arcuate guide groove 32 with the blade 3 and the vertical groove 52 of the fixing plate 5, and the matching installation of the fixing plate 5 and the blade 3 is ensured to ensure that the blade 3 is Between the two fixed clamping plates 5, the sliding pins corresponding to the horizontal holes 34, 35 of the blade 63 and the pin holes 55, 56 of the fixing plate 5 are respectively arranged to be displaced left and right; The sliding pin between the groove 32 and the vertical groove 52 of the fixing plate 5 is guided to cooperate, so that the belt 63 is displaced to the left and right, and an upward displacement occurs. Thereafter, the cutter slider 2 is mounted on the right end of the fixed clamp plate 5 by a positioning structure. In the initial position, the cutter slider 2 is located on the right side of the bladed rack 3, and the left lower end surface of the firing piece 22 and the right side of the bladed rack 3 The tooth is abutted; and the mounted cutter block 2, the fixed plate 5 and the bladed rack 3 are mounted in the inner cavity of the staple cartridge 1. At this time, the upper end of the fixed clamp 5 and the staple cartridge 1 are positioned on the inner cavity. The limit steps are in contact with each other and are set through the inner cavity of the staple cartridge 1 The vertical groove cooperates with the two ribs 54 provided on the fixing plate 5 to fix the fixing plate 5 and the bladed rack 3 thereof to prevent the sliding of the blade 5; the hook 53 and the magazine 1 disposed outside the fixing plate 5 The card slot provided on the card slot is correspondingly engaged, and the fixing plate 5 and the blade strip 3 thereof are fixedly mounted in the staple cartridge 1 to prevent the fixing plate 5 from moving downward and being separated from the inner cavity of the staple cartridge. Finally, the driving and locking device 4 is installed in the lower left corner of the inner cavity of the nail cartridge through the guiding ribs disposed on the outer side thereof, and the driving and locking device 4 is mounted on the left end of the bladed rack 3, in the driving and locking device 4 The right end of the driving ram 42 is in contact with the left end surface of the blade strip 3, and the staple cartridge 1, the fixing plate 5 and the blade strip 3 are fixed by two positioning pins, thereby completing an application driving and clamping device of the present invention. Installation of the stapler staple cartridge assembly. In use, the pre-stitched tissue is placed between the abutment assembly mounted on the jaws and the surface of the cartridge assembly. Before firing, the cutter slider 2 is located on the right side of the initial end of the blade strip 3, the cutter slider The lower end is provided with a push block, the cutter slider, the push block and the push plate are contactable, and the entire cutter slide 2 is buried in the staple cartridge 1, and the cutter is not exposed. When the jaws are closed, the cutter slider 2 has not been activated, a certain tissue gap is maintained between the anvil assembly and the cartridge assembly, the trigger 7 is lightly buckled, the push plate 61 is moved forward, and the cutter slider 1 is pushed on the plate. Under the push of 61, the cutter slider 2 is pushed out of the outer side of the staple cartridge 1. When the knife comes out, part of the titanium nail is first pushed out of the staple cartridge 1 to be closed into a "B" shape, and is stitched, and there is a cutting action. The middle cutting action is later than the stitching action. At this time, the cutter slider 2 has been pushed into position, and the belt 63 is driven by the compression rod 46 provided in the driving and locking device 4 to push the belt 6 to the right by the driving plunger 42. The hour cutter slider 2 is located on the upper side of the belt 63, and the ratchet teeth 242 provided on the cutter slider 2 are engaged with the teeth 31 on the belt rack 3. During the advancement of the push plate 61, the push plate 61 pushes the horizontal grooves 34, 35 on the blade strip 3 and the slide pins provided in the curved guide grooves 32, so that the strip 6 is moved to the left. Further, the cutter slider 2 is further pulled to move to the left, the cutting and stitching is further performed, the push plate 61 is reset, and the bladed rack 3 is moved to the right under the elastic force of the compression spring 46, and the ratchet teeth and the belt on the cutter slider 2 are moved. The teeth on the blade strip 3 abut each other, and the rack provided by the cutter block 2 is retracted by force, and is matched by the rib 221 provided on the right end surface of the cutter block 2 and the inverted tooth 51 on the fixed plate 5. The cutter slider 2 cannot be retracted, and the belt 63 is returned to the initial position by the elastic force of the driving ejector 42. After a section of cutting is completed, the strip 3 is reset and the action is repeated. Since the inner portion of the cutter block 2 is provided with a spring 26 and a pin 25 and a sliding groove 241 which can be slid up and down, the cutter block 2 is reset. After the belt with the blade 3 is driven, the cutting slide is further advanced, and the cutter slider 2 reaches the left end of the magazine 1 until the cutter slider 2 is separated from the belt rack 3 and travels to the left side of the belt rack 3, further Push the push plate 61 to push the cutter slider 2 forward. Referring to FIG. 14 , at this time, the cutter slider 2 and the wedge surface 435 of the locking push block abut against each other, further pushing the wedge surface 435 of the locking push block to move the locking push block 43 downward, and finally The two protrusions 432 on both sides of the pin pushing block 43 are slid over the positions of the protrusions 415 in the guide grooves 414 on both sides of the lower end of the fixed base, and at the same time, the end faces of the locking push blocks 43 push the large diameter end of the push spring 47 downward. Under the elastic force, the small diameter end of the tapered push spring 47 pushes the end surface of the boss 442 of the locking block 44, and the locking block 44 is pushed up to the side of the driving ram 42. Referring to FIG. 15 and FIG. 16, the trigger is released, and the push plate 61 rebounds to the initial position. Under the elastic force of the compression spring 46, the driving ejector 42 pushes the belt 6 to the right. At this time, The locking block 44 is slidably rubbed against the side of the driving ram 42. When the driving ram 42 is moved to the rightmost end, the locking block 44 is separated from the side of the driving ram 42 by the elastic force of the urging spring 47. The locking block 44 is moved downward, and the end surface of the locking block 44 is located below the end surface of the driving ram 42. When the trigger is gripped again, the driving ram 42 moves to the left, and the end side of the driving ram 42 abuts against the end side of the locking block 44, the trigger cannot continue to be gripped, and the firing can not be performed again, and the cutting and suturing operation is completed. The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Those skilled in the art can make some simple modifications, equivalent changes or modifications using the technical contents disclosed above. Within the scope of protection of the invention.

Claims

claims

1. A driving and locking device, characterized by including a fixed base, a driving ejector rod, a locking push block and a locking block, wherein: the bottom of the driving ejector rod is connected to the fixed base through a compression spring; the locking block A spring is installed between the locking push block and the locking push block. The locking block and the locking push block are slidably installed on the fixed base. When the compression spring is relaxed, the locking block can slide between the driving ejector rod and the fixed base. .

2. The driving and locking device according to claim 1, characterized in that: one side of the fixed base is an accommodation cavity, and the other side is a locking push block sliding groove, and between the accommodation cavity and the locking The dividing surface between the sliding grooves of the push block is provided with a through hole; the locking block is provided with a convex column, the driving ejector rod and the locking block are located in the accommodation cavity, and the convex column of the locking block passes through Through the through hole of the fixed base, and connected to the locking push block in the sliding groove of the locking push block through a spring.

3. The driving and locking device according to claim 2, characterized by further comprising a fixed rod: the protruding column is provided with a through hole along its central axis, and is provided with relative blocking steps in the through hole; The locking push block is provided with a countersunk hole; the fixed rod passes through the countersunk hole of the locking push block, the spring and the protruding column of the locking block, and one end is a plug that offsets the countersunk hole of the locking push block. The other end is provided with an opposite clamping platform to offset the clamping step in the convex column of the locking clamping block.

4. The driving and locking device according to claim 2, characterized in that: The bottom of the sliding groove of the locking push block is provided with a guide groove, and a limiting bump is provided in the guide groove; the bottom of the locking push block is provided with a guide bar corresponding to the guide groove, and is provided with a limiting bump. The bump corresponding to the bit bump.

5. The driving and locking device according to claim 2, characterized in that: the inner cavity with an opening at the bottom of the driving ejector rod is provided with relative protrusions at the bottom of the outer wall; There is a center rod corresponding to the inner cavity of the driving ejector rod, and a chute corresponding to the protrusion of the driving ejector rod is provided on the inner wall; the compression spring is installed in the inner cavity of the driving ejector rod and is set in the container. Place it on the center rod of the cavity.

6. The driving and locking device according to claim 1, characterized in that: the spring is a conical spring, the small diameter end of which offsets the locking block, and the large diameter end of which offsets the locking push block.

7. The driving and locking device according to claim 1, characterized in that the outer end of the locking push block is provided with a wedge-shaped surface.

8. A cutting stapler, characterized by including a jaw, a nail base assembly, a nail cartridge assembly, a propelling mechanism and a firing mechanism, wherein: the nail cartridge assembly includes a nail cartridge, a cutter slide block, a knife rack, and The driving and locking device according to any one of claims 1 to 7; the top end of the driving ejector of the driving and locking device offsets the knife rack, and compresses the compression spring with the advancement of the knife rack; The locking push block of the driving and locking device corresponds to the cutting end position of the cutter slide block, and when the cutting is completed, it moves toward the inside of the fixed base under the action of the cutter slide block.

9. The cutting and suturing device according to claim 8, characterized in that: the cutter slider includes a cutter and a firing piece arranged on both sides of the cutter, and a ridge is provided on the outer wall of the firing piece; The nail bin assembly also includes a fixed plywood fixedly connected to the jaws, and the fixed plywood is provided with back-stop teeth corresponding to the convex edges of the cutter slider; the knife rack is provided with a guide groove, And it is slidably installed on the fixed plywood through pins.

10. The cutting stapler according to claim 8, characterized in that: a tooth plate is installed between the knife rack and the cutter slide block, and the tooth plate passes through a spring and a pin that are perpendicular to the cutting direction. The sliding groove structure is connected to the cutter slide block, and the lower edge is a ratchet that matches the knife rack.