Surgical cutting stapler

Abstract

The application discloses a surgical cutting anastomat, wherein the staple and the knife pad are located at the same side of the cut tissue and can be integrally replaced, so that the component replacement operation is simplified. The surgical cutting anastomat comprises an execution head, the execution head comprises a anvil assembly and a cartridge assembly, the cartridge assembly comprises a cartridge shell, staples located in the cartridge shell, a pusher which is arranged in the cartridge shell and can slide forward and backward and is used for pushing the staples out of the cartridge shell, and a knife pad arranged in the cartridge shell, the anvil assembly further comprises a cutting knife which is arranged on the front frame and can slide forward and backward, the front part of the cutting knife is formed with a cutting part located in front of the knife pad, the execution head further comprises a reversing transmission mechanism used for driving the cutting knife to move from front to back, and the surgical cutting anastomat further comprises a driving mechanism used for driving the pusher to move from back to front, the driving mechanism is connected between the execution head and a handle assembly, and the reversing transmission mechanism is connected between the driving mechanism and the rear part of the cutting knife.

Description

[0001] This application is a divisional application of the invention patent application with application number 201710107202X filed on February 27, 2017. Technical Field

[0002] This invention belongs to the field of medical devices, and specifically relates to a surgical cutting and anastomosis device. Background Technology

[0003] Traditional straight-tipped and curved transverse cutting staplers are mainly used for anastomosis creation and stump or incision closure in gastrointestinal reconstruction and organ resection surgeries where surgical field exposure is difficult. Currently, the common procedure for transverse cutting staplers is as follows: after locking the tissue with the locking handle, pushing the firing handle moves the cutter, which is concealed within the staple cartridge assembly, driven by the central rod of the firing handle. On the other side of the tissue to be cut are the anvil and the blade pad, providing a cutting platform. The entire cutting process is completed when the driven straight blade cuts through the blade pad. The cut blade pad is generally not reusable.

[0004] Surgery on the same patient often cannot be completed in a single incision and requires multiple incisions. If instruments are changed at each incision, it increases the patient's treatment costs. Therefore, instruments that can provide component replacement are generally needed to reduce costs without affecting the patient's health. Existing component replacement instruments typically replace the anvil, blade pad, and staple cartridge assembly as a whole. Replacing multiple parts at once is very difficult, and these parts are not fixed as a single unit. The personnel replacing the components need to move the positions of the individual parts, and the high degree of freedom between the parts makes it easy to make mistakes. Untrained personnel simply cannot replace them properly, and even trained personnel find it difficult. The component replacement process wastes the doctor's energy and surgical time.

[0005] For example, Chinese patent CN101966093B discloses a laparoscopic surgical stapler with a replaceable staple cartridge assembly. Its actuator head consists of an actuator frame, a slide bar, a staple cartridge assembly, and an anvil assembly. The staple cartridge housing has staple grooves, staple pushing holes, a slide groove, and a pusher groove. The anvil assembly has a staple forming groove corresponding to the position of the staples in the staple cartridge assembly and a cutting groove corresponding to the position of the pusher groove in the staple cartridge housing on its end face. A cutting blade is installed in the pusher groove of the staple cartridge housing. An arc-shaped slide groove is located at the proximal end of the staple cartridge housing. During use, the slide bar moves from the proximal end to the distal end of the staple cartridge assembly, and the pusher slide, relying on its inclined surface, pushes the staple pushing block to move within the staple pushing hole, thus pushing the staples out of the staple groove. Although the staple cartridge assembly is easy to replace, after each suture, both the staple cartridge assembly and the anvil assembly with the blade pad need to be replaced separately, making it inconvenient to use. Summary of the Invention

[0006] To address the aforementioned problems, the present invention aims to provide a surgical cutting stapler in which the staples and blade pad are located on the same side of the tissue being cut and can be replaced as a single unit, thereby simplifying component replacement operations.

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

[0008] A surgical stapler includes an actuator head at a front end and a handle assembly at a rear end. The actuator head includes a front frame, an anvil assembly mounted on the front frame, and a staple cartridge assembly detachably mounted on the front frame. The staple cartridge assembly is located behind the anvil assembly and includes a staple cartridge housing, staples located within the staple cartridge housing, and a staple pusher slidably disposed within the staple cartridge housing for ejecting the staples from the staple cartridge housing. The anvil assembly includes a staple abutment fixedly mounted on the front frame, with a staple forming groove corresponding to the staple formed on its end face. The staple cartridge assembly also includes a blade pad disposed within the staple cartridge housing. The anvil assembly further includes a cutting blade slidably disposed on the front frame, with a cutting portion formed at its front end before the blade pad. The actuator head also includes a tool for carrying... The surgical stapler includes a reversing transmission mechanism that moves the cutting blade from front to back, and a drive mechanism for moving the pusher from back to front. The drive mechanism is connected between the execution head and the handle assembly. The reversing transmission mechanism includes a gear or gear set that can be driven to rotate by the drive mechanism. The rear part of the cutting blade has a first rack portion with a plurality of teeth arranged sequentially in the forward direction. The drive mechanism has a second rack portion with a plurality of teeth arranged sequentially in the front-back direction. The first rack portion and the second rack portion are respectively located on opposite sides of the gear or gear set. The surgical stapler has a cutting state. When the surgical stapler is in the cutting state, the first rack portion and the second rack portion are respectively engaged with the opposite sides of the gear or gear set.

[0009] More preferably, the drive mechanism includes a central rod that can slide in a front-rear direction, and the front part of the central rod has the second rack portion.

[0010] Furthermore, the drive mechanism also includes a push rod that can slide in the front-back direction to push the pusher forward, and a transmission assembly connected between the push rod and the central rod to allow the push rod to slide with the central rod. The surgical stapler also has a nail-driving state. When the surgical stapler is in the nail-driving state, the second rack part and the gear or gear set disengage, and the staple is pushed out of the staple cartridge by the pusher.

[0011] Furthermore, the transmission assembly includes a first slide groove formed on the central rod and extending in the front-rear direction, a first shaft slidably disposed within the first slide groove, a first hinge rod whose front end is rotatably connected to the rear end of the leg rod via the first shaft, a second slide groove formed on the central rod and extending obliquely in the vertical direction, a second shaft slidably disposed within the second slide groove, a second hinge rod whose front end is rotatably connected to the rear end of the first hinge rod via the second shaft, a third slide groove formed on the central rod and extending in the front-rear direction, and a third shaft slidably disposed within the third slide groove, wherein the rear end of the second hinge rod is rotatably connected to the rear shell via the third shaft.

[0012] Furthermore, the surgical stapler has an initial state in which the second rack portion of the central rod is located a distance after the front end of the push rod.

[0013] Preferably, the center rod is configured such that after being pushed forward to a certain position, the center rod meshes with the gear or gear set.

[0014] Furthermore, the drive mechanism also includes a rear housing, a firing handle rotatably disposed on the rear housing, and a firing element connected to the firing handle and rotatable with the firing handle, the firing element having a position that abuts against the rear end of the center rod to push the center rod forward.

[0015] More preferably, the reversing transmission mechanism further includes a torsion spring for resetting the gear or gear set.

[0016] Preferably, the pusher includes multiple rows of pusher pins respectively disposed on the left and right sides of the blade pad.

[0017] Preferably, the front frame is provided with a positioning pin, and the cutter is provided with a long groove extending in the front-back direction, and the positioning pin can be slidably inserted into the long groove in the front-back direction.

[0018] The present invention adopts the above technical solution and has the following advantages compared with the prior art:

[0019] The scalpel pad and staple cartridge assembly are located on the same side of the tissue being cut. This allows for easy replacement of only the staple cartridge assembly, which includes the staples and scalpel pad, when changing components. The replacement of the staples and scalpel pad is a simple and convenient operation, simplifying the component replacement process. This design overcomes the limitations of existing technologies where the scalpel pad and staple cartridge assembly are separated and located on opposite sides of the tissue being cut. It eliminates difficulties such as multiple positioning positions and instability of the replaced components during component replacement, improving the user experience and reducing the probability of errors. Attached Figure Description

[0020] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Appendix Figure 1 This is a schematic diagram of a surgical cutting stapler of the present invention in its initial state.

[0022] Appendix Figure 2 This is a schematic diagram of a staple cartridge assembly according to the present invention;

[0023] Appendix Figure 3 This is a schematic diagram of a cutting tool according to the present invention;

[0024] Appendix Figure 4 For the appendix Figure 1 The diagram shown illustrates the actuator head in the nail-driving state.

[0025] Appendix Figure 5 For the appendix Figure 4 The schematic diagram of the actuator head shown omits the left anvil.

[0026] Appendix Figure 6 For the appendix Figure 1 The diagram shown illustrates the execution head in the cutting state.

[0027] Appendix Figure 7 For the appendix Figure 6 The schematic diagram of the actuator head shown omits the left anvil.

[0028] In the above attached figures,

[0029] 1. Actuator head; 2. Handle assembly; 3. Drive mechanism;

[0030] 11. Front frame; 110. Locating pin; 12. Anvil assembly; 13. Spike cartridge assembly; 14. Gear; 15. Torsion spring;

[0031] 121. Anchor seat; 122. Cutter; 1220. Cutting section; 1221. First rack section; 1222. Long groove;

[0032] 131. Pin cartridge housing; 132. Pin pusher assembly; 133. Blade pad;

[0033] 30. Rear housing; 31. Center rod; 310. Second rack section; 32. Push rod; 33. Firing handle; 34. Firing element; 3a. First slide groove; 3b. First shaft; 3c. First hinge rod; 3d. Second slide groove; 3e. Second shaft; 3f. Second hinge rod; 3g. Third slide groove; 3h. Third shaft. Detailed Implementation

[0034] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is for the purpose of aiding understanding the present invention, but does not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] The directional terms "front" and "back" used in this invention are defined based on the conventional observation perspective of those skilled in the art and for ease of description, and do not limit specific directions. For example, "front" and "back" respectively correspond to the attached... Figure 1 The left and right sides of the paper.

[0036] As attached Figure 1-7 As shown, a surgical cutting and suturing device includes an execution head 1 located at the front end, a handle assembly 2 located at the rear end, and a drive mechanism 3 for connecting the execution head 1 and the handle assembly 2.

[0037] The execution head 1 includes a front frame 11, an anvil assembly 12 disposed on the front frame 11, and a staple cartridge assembly 13 disposed on the front frame 11. Specifically, the staple cartridge assembly 13 is detachably disposed from the front frame 11. The front frame 11 has a receiving groove that cooperates with the staple cartridge assembly 13. The staple cartridge assembly 13 can be slidably inserted into the receiving groove for sewing and can be removed and replaced after one sewing.

[0038] The staple cartridge assembly 13 includes a staple cartridge shell 131 with an internal cavity, and a plurality of staples located within the staple cartridge shell 131 for suturing tissue. The staple cartridge shell 131 has a plurality of staple slots for ejecting the staples. The staple cartridge assembly 13 also includes a staple pusher 132 slidably disposed within the staple cartridge shell 131 to push the staples out of the staple slots. The staple cartridge assembly 13 also includes a blade pad 133 disposed within the staple cartridge shell 131 and capable of cooperating with a cutting blade. The blade pad 133 is specifically disposed on the staple pusher 132, which has multiple rows of staple pusher needles. At least one row of staple pusher needles is respectively disposed on the left and right sides of the blade pad 133.

[0039] The anvil assembly 12 includes an anvil seat 121 that engages with a staple. A staple forming groove corresponding to the staple is formed on the rear end face of the anvil seat 121. When the staple is pushed out of the staple cartridge housing 131 and passes through the tissue, the staple contacts the anvil seat 121 and is bent into shape by the staple forming groove. The staple cartridge assembly 13 is located after the anvil assembly 12, and the two are arranged opposite each other with a certain distance between them. The anvil assembly 2 also includes a cutter 122 slidably mounted on the front frame 11. The front part of the cutter 122 has a cutting section 1220 located before the blade pad 133. Corresponding to the staple pusher 132, at least one anvil seat 121 is provided on each of the left and right sides of the cutter 122. Specifically, a positioning pin 110 is provided on the front frame 11, and a long groove 1222 extending in the front-rear direction is formed on the cutter 122. The positioning pin 110 is slidably inserted into the long groove 1222 in the front-rear direction. There are more than 1222 long slots, which are opened at different positions of the cutter 122.

[0040] The aforementioned drive mechanism 3 is used to move the pusher 132 from rear to front to push out the sewing staple for sewing. The execution head 1 also includes a reversing transmission mechanism for moving the cutter 122 from front to rear. Another function of the drive mechanism 3 is to drive the cutter 122 to move in the opposite direction from front to back through the reversing transmission mechanism for cutting. The reversing transmission mechanism is connected between the drive mechanism 3 and the rear part of the cutter 122. The reversing transmission mechanism includes a gear 14 or gear set that can be driven to rotate by the drive mechanism 3. The rear part of the cutter 122 has a first rack portion 1221. The upper edge of the first rack portion 1221 has a plurality of teeth arranged sequentially in the forward direction. The lower part of the gear 14 or gear set meshes with the first rack portion 1221, and the first rack portion 1221 and the drive mechanism 3 are located on opposite upper and lower sides of the gear 14 or gear set, respectively. The reversing transmission mechanism also includes a torsion spring 15 for resetting the gear 14 or gear set.

[0041] The drive mechanism 3 includes a central rod 31 that can slide in the front-back direction. The front part of the central rod 31 has a second rack portion 310. The lower edge of the second rack portion 310 is provided with a plurality of teeth arranged sequentially in the front-back direction. The first rack portion 1221 and the second rack portion 310 are respectively located on opposite sides of the gear 14 or the gear set. The surgical cutting stapler has a cutting state. When the surgical cutting stapler is in the cutting state, the first rack portion 1221 and the second rack portion 310 respectively mesh with the opposite sides of the gear 14 or the gear set.

[0042] The drive mechanism 3 also includes a push rod 32 that can slide in the front-back direction to push the pusher 132 forward, and a transmission assembly connected between the push rod 32 and the center rod 31 so that the push rod 32 can slide with the center rod 31. The surgical stapler also has a nail-driving state. When the surgical stapler is in the nail-driving state, the second rack portion 310 and the gear 14 or gear set disengage, and the staple is pushed by the pusher 132 to the outside of the staple cartridge 131.

[0043] The surgical stapler has an initial state in which the second rack portion 310 of the central rod 31 is located a distance behind the front end of the push rod 32. Therefore, as the central rod 31 is fired and slides forward, the surgical stapler first transitions from the initial state to the nail-driving state, and then to the cutting state.

[0044] The transmission assembly includes a first groove 3a formed on the central rod 31 and extending in the front-rear direction, a first shaft 3b slidably disposed within the first groove 3a, a first hinge rod 3c whose front end is rotatably connected to the rear end of the push rod 32 via the first shaft 3b, a second groove 3d formed on the central rod 31 and extending obliquely in the vertical direction, a second shaft 3e slidably disposed within the second groove 3d, a second hinge rod 3f whose front end is rotatably connected to the rear end of the first hinge rod 3c via the second shaft 3e, a third groove 3g formed on the central rod 31 and extending in the front-rear direction, and a third shaft 3h slidably disposed within the third groove 3g. The rear end of the second hinge rod 3f is rotatably connected to the rear housing 30 via the third shaft 3h. The upper end of the second groove 3d communicates with the front end of the third groove 3g. The second groove 3d extends obliquely upward from front to back, and the first groove 3a and the second groove 3d are on the same straight line. When the surgical stapler is in the stapling state, under the action of the transmission device, the second shaft 3e slides in the second slide groove 3d, so that the first hinge rod 3c and the second hinge rod 3f are in the same straight line, thereby making the sliding distance of the push rod 32 greater than the sliding distance of the center rod 31, so that the staple is pushed out of the housing 131 by the pusher 132, and the cutter 122 is located in the housing 131. When the surgical stapler is in the cutting state, the center rod 31 continues to slide forward. Since the first shaft 3b slides in the first slide groove 3a, and the second shaft 3e and the third shaft 3h slide in the third slide groove 3g, the second rack part 310 and the gear 14 or gear set mesh, thereby driving the cutter 122 to cut from front to back.

[0045] The drive mechanism 3 also includes a firing handle 33 rotatably connected to the handle assembly 2, and a firing element 34 connected to the firing handle 33 and capable of rotating with the rotation of the firing handle 33. The upper end of the firing element 34 has a position that abuts against the rear end face of the center rod 3131 to push the center rod 31 to slide forward.

[0046] When the center rod 31 is pushed forward to a certain position, it engages with gear 14 or gear set. Gear 14 or gear set drives the cutter 122 to move, and the cutter 122 moves from the anvil 121 side to the staple cartridge assembly 13 side to cut the tissue until it reaches the cutting blade pad 133. After cutting, it is released and reset, and the cutter 122 and staple cartridge assembly 13 are reset, and the instrument will not fire again. The component replacement process is as follows: remove the staple cartridge assembly, then take out the component to be replaced, align the insertion port of the instrument and the staple cartridge assembly, and press it into the instrument body. A click sound is heard, and the component replacement is completed.

[0047] The above embodiments are merely illustrative of the technical concept and features of the present invention, and are preferred embodiments. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and they should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A surgical stapler, comprising an execution head at a front end and a handle assembly at a rear end, the execution head including a front frame, an anvil assembly disposed on the front frame, and a staple cartridge assembly detachably disposed on the front frame, the front frame having a receiving groove that mates with the staple cartridge assembly, the staple cartridge assembly being located behind the anvil assembly, the staple cartridge assembly including a staple cartridge housing, staples disposed within the staple cartridge housing, and a staple pusher slidably disposed within the staple cartridge housing for pushing the staples out of the staple cartridge housing, the anvil assembly including a staple abutment fixedly disposed on the front frame, the staple abutment having a staple forming groove corresponding to the staple formed on its end face, characterized in that: The staple cartridge assembly further includes a blade pad disposed within the staple cartridge housing. The anvil assembly further includes a cutting blade slidably disposed on the front frame. The front portion of the cutting blade forms a cutting section located in front of the blade pad. The actuator head further includes a reversing transmission mechanism for driving the cutting blade to move from front to back. The surgical stapler further includes a drive mechanism for driving the staple pusher to move from back to front. The drive mechanism is connected between the actuator head and the handle assembly. The reversing transmission mechanism includes a gear or gear set that can be driven to rotate by the drive mechanism. The rear part has a first rack portion, which has a plurality of teeth arranged sequentially in the front-rear direction. The drive mechanism includes a central rod that can slide in the front-rear direction. The front part of the central rod has a second rack portion, which has a plurality of teeth arranged sequentially in the front-rear direction. The first rack portion and the second rack portion are respectively located on opposite sides of the gear or gear set. The surgical stapler has a cutting state. When the surgical stapler is in the cutting state, the first rack portion and the second rack portion respectively mesh with the opposite sides of the gear or gear set. The drive mechanism further includes a push rod that can slide in the front-back direction for pushing the pusher forward, and a transmission assembly connected between the push rod and the central rod so that the push rod can slide with the central rod. The surgical stapler also has a nail-driving state. When the surgical stapler is in the nail-driving state, the second rack part and the gear or gear set are disengaged, and the staple is pushed out of the staple cartridge by the pusher. The surgical stapler has an initial state in which the second rack portion of the central rod is located a distance after the front end of the push rod; the central rod is configured to engage with the gear or gear set after being pushed forward to a certain position.

2. The surgical stapler according to claim 1, characterized in that: The transmission assembly includes a first slide groove formed on the central rod and extending in the front-rear direction, a first shaft slidably disposed in the first slide groove, a first hinge rod whose front end is rotatably connected to the rear end of the push rod via the first shaft, a second slide groove formed on the central rod and extending obliquely in the vertical direction, a second shaft slidably disposed in the second slide groove, a second hinge rod whose front end is rotatably connected to the rear end of the first hinge rod via the second shaft, a third slide groove formed on the central rod and extending in the front-rear direction, and a third shaft slidably disposed in the third slide groove. The drive mechanism also includes a rear housing, and the rear end of the second hinge rod is rotatably connected to the rear housing via the third shaft.

3. The surgical stapler according to claim 1, characterized in that: The drive mechanism further includes a rear housing, a firing handle rotatably disposed on the rear housing, and a firing element connected to the firing handle and rotatable with the firing handle, the firing element having a position that abuts against the rear end of the center rod to push the center rod forward.

4. The surgical stapler according to claim 1, characterized in that: The reversing transmission mechanism also includes a torsion spring for resetting the gear or gear set.

5. The surgical stapler according to claim 1, characterized in that: The pusher pin includes multiple rows of pusher pins respectively located on the left and right sides of the blade pad.

6. The surgical stapler according to claim 1, characterized in that: The front frame is provided with a positioning pin, and the cutter is provided with a long groove extending in the front-to-back direction. The positioning pin can be slidably inserted into the long groove in the front-to-back direction.

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