An anastomat back knife structure

Abstract

The utility model discloses an anastomat back -knife structure relates to medical instrument technical field, include: casing, rack, back -knife wheel subassembly, reset handle. The rack is worn in the casing, and the rack can be active along the length direction of rack, and the one end of rack is connected with anastomat blade, and a plurality of back -off tooth grooves are arranged on the rack at intervals, back -knife wheel subassembly rotation is installed in the casing, and back -off tooth groove is located the one side of rack close to back -knife wheel subassembly, and when the back -knife wheel subassembly positive rotation can drive the rack to move to the direction of away from anastomat blade through back -off tooth groove, and the rack keeps stationary when the back -knife wheel subassembly reverse rotation, reset handle is linked with back -knife wheel subassembly, and reset handle is used for driving back -knife wheel subassembly reciprocating rotation. The utility model can drive anastomat blade to move to reset manually.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a stapler retraction structure. Background Technology

[0002] Laparoscopic staplers are suitable for closing intestinal stumps in gastrointestinal and urological surgeries, especially for intestinal surgeries with large proximal-distal distances. This stapler can be operated on with headless laparoscopic instruments, making the surgical procedure more convenient, simpler, and safer. Compared with traditional open surgery, laparoscopic gastrointestinal anastomosis has advantages such as less trauma and faster postoperative recovery. Furthermore, disposable staplers are convenient to use, inexpensive, and have a lower risk of postoperative infection. In minimally invasive surgery, the laparoscopic stapler is a key tool; it cuts tissue with an internal cutter while firing staples, and uses three rows of staples on each side to complete tissue suturing and hemostasis. The surgical procedure is as follows: First, the disposable end effector is assembled onto the instrument. This effector includes a staple cartridge assembly and an anvil, which can be opened and closed. Next, the closed end effector is inserted into the human tissue through a matching trocar. Then, the staple cartridge assembly and anvil are opened, and the staple cartridge assembly is manually adjusted to the appropriate position. Once the location is determined, the end effector is closed to clamp the tissue, and then the instrument is fired to cut and suture the tissue. After completion, the end effector is opened to release the tissue, and after closing again, it is removed through a trocar. In the prior art, if a circuit or mechanical failure occurs during the use of the electric stapler, the drive motor cannot drive the blade to retract and reset, resulting in the blade not being able to retract. The inability to retract the blade will keep the stapler jaws in a closed state and unable to open. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a stapler blade return structure that allows manual driving of the stapler blade to move to its reset position.

[0004] A stapler blade return structure according to a first aspect of the present invention includes: a housing, a rack, a return wheel assembly, and a reset handle. The rack passes through the housing and is movable along its length. One end of the rack is connected to a stapler blade, and multiple retraction grooves are spaced apart on the rack. The return wheel assembly is rotatably mounted on the housing. The retraction grooves are located on the side of the rack closer to the return wheel assembly. When the return wheel assembly rotates forward, it can drive the rack to move away from the stapler blade through the retraction grooves. When the return wheel assembly rotates in the reverse direction, the rack remains stationary. The reset handle is connected to the return wheel assembly and is used to drive the return wheel assembly to reciprocate.

[0005] According to an embodiment of the present invention, a stapler retraction structure has at least the following beneficial effects: When the stapler blade is stuck, the operator reciprocates by moving the reset handle, thereby driving the reciprocating rotation of the retraction wheel assembly. Through the transmission of the retraction wheel assembly, the reciprocating motion of the reset handle is manually controlled to drive the rack to move backward unidirectionally. The step-by-step drive of the rack by the retraction wheel assembly drives the stapler blade to retract. The reset handle and the retraction wheel assembly form a lever structure, which can effectively amplify the operator's rotational torque and drive the stuck stapler blade backward with less effort.

[0006] According to some embodiments of the present invention, the return wheel assembly includes a first disk and gear teeth. A return shaft is connected inside the housing. The first disk is rotatably mounted on the return shaft. A rotating shaft is eccentrically arranged on the first disk. The gear teeth are rotatably mounted on the rotating shaft. The gear teeth have a first state of extending out of the outside of the first disk and a second state of retracting into the first disk. When the return wheel assembly rotates in the forward direction, the gear teeth are in the first state and can mesh with the retraction tooth groove. When the return wheel assembly rotates in the reverse direction, the retraction tooth groove can push the gear teeth to move to the second state.

[0007] According to some embodiments of the present invention, a stop block is provided on the first disk, and when the gear tooth rotates to the first state, the stop block abuts against the gear tooth.

[0008] According to some embodiments of the present invention, an elastic element is provided on the first disk, the elastic element abuts against the gear teeth, and the elastic element is used to drive the gear teeth to rotate from the second state to the first state.

[0009] According to some embodiments of this utility model, the gear teeth, the rotating shaft, and the stop are arranged in multiple sets around the return shaft.

[0010] According to some embodiments of the present invention, a positioning post is connected to the center of the first disk, the elastic element is annular, and the elastic element is sleeved on the positioning post.

[0011] According to some embodiments of the present invention, the first disk is detachably connected to the second disk, and the gear teeth are located between the first disk and the second disk.

[0012] According to some embodiments of the present invention, the second disc is provided with a first positioning groove and a second positioning groove, the first positioning groove being for the rotating shaft to be inserted, and the second positioning groove being for the stop block to be inserted.

[0013] According to some embodiments of the present invention, the rack has transmission teeth on its side, and a driving device is provided inside the housing. The driving device meshes with the transmission teeth to drive the rack to move.

[0014] According to some embodiments of the present invention, the housing is provided with an opening, and the opening is provided with a removable cover plate, which facilitates operation of the reset grip.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the installation structure of one embodiment of the present utility model; Figure 2 This is a schematic diagram showing the cover plate being opened according to one embodiment of the present invention; Figure 3 This is a schematic diagram of a rack and return wheel assembly according to an embodiment of the present invention; Figure 4 This is a schematic diagram of a return wheel assembly according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the first disk according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the second disk according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the first disk rotating in reverse according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the first disk rotating in the forward direction according to an embodiment of the present invention.

[0017] Icon labels: Casing 100; 200 rack, 210 stapler blade, 220 retraction groove; Return wheel assembly 300, first disc 310, rotating shaft 311, stop block 312, elastic element 313, positioning post 314, gear tooth 320, second disc 330, first positioning groove 331, second positioning groove 332; Reset grip 400; Return shaft 500; Transmission gear 600; Opening 700; Cover plate 800. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0021] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0022] Reference Figures 1 to 8As shown, an embodiment of the present invention provides a stapler retraction structure, comprising: a housing 100, a rack 200, a retraction wheel assembly 300, and a reset handle 400. The rack 200 passes through the housing 100 and extends in a front-to-back direction. The rack 200 is movable along its length, and one end of the rack 200 is connected to a stapler blade 210. The rack 200 serves as part of a transmission structure for driving the stapler blade 210 to move back and forth. When the stapler blade 210 becomes stuck and cannot retract, the rack 200 can be driven to move backward to force the stapler blade 210 back. The upper surface of the rack 200 has multiple retraction grooves 220 spaced along the front-to-back direction. The return wheel assembly 300 is rotatably mounted on the housing 100, located above the rack 200. The retraction grooves 220 are located on the side of the rack 200 closest to the return wheel assembly 300. When the return wheel assembly 300 rotates forward, it can drive the rack 200 to move away from the stapler blade 210 through the retraction grooves 220. When the return wheel assembly 300 rotates in the reverse direction, the rack 200 remains stationary. The reset handle 400 is connected to the return wheel assembly 300 and is used to drive the return wheel assembly 300 to reciprocate. When the stapler blade 210 gets stuck, the operator reciprocates by moving the reset handle 400, which in turn drives the return wheel assembly 300 to rotate reciprocally. The stepping drive rack 200 moves backward to retract the stapler blade 210. The reset handle 400 and the return wheel assembly 300 form a lever structure, which can effectively amplify the operator's rotational torque and drive the stuck stapler blade 210 backward with less effort.

[0023] Reference Figure 4 Zhihe Figure 8As shown, the return wheel assembly 300 includes a first disc 310 and gear teeth 320. A return shaft 500 is connected inside the housing 100. The extension direction of the return shaft 500 is perpendicular to the extension direction of the rack 200. The first disc 310 is rotatably mounted on the return shaft 500 and can rotate around the return shaft 500. A rotating shaft 311 is eccentrically mounted on the first disc 310 and is connected to the first disc 310 by insertion or thread. The rotating shaft 311 has high machining accuracy and material requirements, so the first disc 310 and the rotating shaft 311 are manufactured separately. Because the rotating shaft 311 is subjected to large forces and has a small size, high-strength alloy materials such as titanium alloy and tungsten alloy are selected for the rotating shaft 311. The gear tooth 320 is rotatably mounted on the rotating shaft 311. The gear tooth 320 has a first state where it extends outward from the first disk 310, and a second state where it retracts into the first disk 310. The gear tooth 320 can rotate around the rotating shaft 311 to switch between the first and second states. When the return wheel assembly 300 rotates forward, the gear tooth 320 is in the first state, and the gear tooth 320 in the first state can mesh with the retraction groove 220. When the first disk 310 rotates forward, it can drive the rack 200 to move backward through the gear tooth 320 in the first state. When the return wheel assembly 300 rotates in reverse, the gear tooth 320 in the first state is pushed by the retraction groove 220 to the second state. Therefore, when the first disk 310 rotates in reverse, it cannot drive the rack 200 to move. By switching the states of the gear tooth 320, manual control can be achieved to drive the rack 200 to move backward unidirectionally through the reciprocating rotation of the first disk 310.

[0024] Reference Figure 7 and Figure 8 As shown, it can be understood that a stop 312 is provided on the first disk 310. The stop 312 is integrally formed with the first disk 310. The machining precision requirement of the stop 312 is low, and it can be integrally cast with the first disk 310. When the gear tooth 320 rotates to the first state, the stop 312 abuts against the gear tooth 320. The stop 312 is used to position the gear tooth 320 in the first state. When the first disk 310 rotates forward, the gear tooth 320 in the first state can mesh with the relief groove 220 to drive the rack 200 to move backward. To facilitate the rotation of the gear tooth 320 from the first state to the second state, the stop 312 avoids the movement path of the gear tooth 320 from the first state to the second state.

[0025] Reference Figures 4 to 6 As shown, it can be understood that an elastic element 313 is provided on the first disk 310. The elastic element 313 abuts against the gear tooth 320 and is used to drive the gear tooth 320 to rotate from the second state to the first state. Furthermore, the elastic element 313 can push the gear tooth 320 to abut against the stop block 312, so that the gear tooth 320 remains in the first state.

[0026] Reference Figure 3 As shown, it can be understood that multiple sets of gear teeth 320, rotating shaft 311, and stop blocks 312 are arranged around the return shaft 500. This makes the backward movement of the rack 200 driven by the gear teeth 320 smoother. The multiple sets of gear teeth 320, rotating shaft 311, and stop blocks 312 are located on the part of the first disk 310 away from the reset handle 400. When the stapler is working normally, when the reset handle 400 rotates to be parallel with the rack 200, any gear tooth 320 in the first state will separate from the retraction groove 220 on the rack 200, so that the return wheel assembly 300 will not affect the forward and backward movement of the rack 200.

[0027] Reference Figures 6 to 8 As shown, it can be understood that a positioning post 314 is connected to the center of the first disc 310, and the elastic element 313 is annular, made of rubber or silicone, and is fitted onto the positioning post 314. The positioning post 314 serves to position and support the inner side of the elastic element 313. A protrusion is provided on the gear tooth 320. During the rotation of the gear tooth 320 from the first state to the second state, the protrusion squeezes the elastic element 313, causing it to elastically deform. The elastic element 313 drives the gear tooth 320 to rotate from the second state to the first state through the protrusion. The front sidewall of the retraction groove 220 is inclined to facilitate the rotation of the gear tooth 320 from the first state to the second state. The rear sidewall of the retraction groove 220 is vertically arranged to allow the gear tooth 320 in the first state to move the retraction groove 220 backward.

[0028] Reference Figures 1 to 8 As shown, it can be understood that the first disk 310 is detachably connected to a second disk 330, and the gear tooth 320 is located between the first disk 310 and the second disk 330. A threaded post is connected to the center of the side of the positioning post 314 away from the first disk 310. The diameter of the positioning post 314 is larger than the diameter of the threaded post. The threaded post passes through the second disk 330, and its outer peripheral wall is threaded. A thin hexagonal nut is threaded onto the threaded post, and the thin hexagonal nut abuts against the side of the second disk 330 away from the first disk 310. The thin hexagonal nut pushes the second disk 330 tightly against the positioning post 314. The first disk 310 and the second disk 330 are connected by threads for easy assembly. The function of the second disk 330 is to limit the gear tooth 320, preventing it from disengaging from the rotating shaft 311.

[0029] Reference Figures 1 to 8As shown, it can be understood that the second disc 330 is provided with a first positioning groove 331 and a second positioning groove 332. The first positioning groove 331 is for the rotating shaft 311 to be inserted, and the second positioning groove 332 is for the stop block 312 to be inserted. The end of the stop block 312 and the rotating shaft 311 away from the first disc 310 is inserted into the second disc 330, so that the first disc 310, the second disc 330, the stop block 312, and the rotating shaft 311 together form a relatively stable structure that can withstand greater forces and prevent the rotating shaft 311 and the stop block 312 from bending and deforming due to excessive force by the user. The side of the first disc 310 and the second disc 330 away from each other is provided with a slot for the reset handle 400 to be inserted, and the reset handle 400 is bolted to the first disc 310 and the second disc 330.

[0030] Reference Figure 3 As shown, it can be understood that the rack 200 has transmission teeth 600 on its side, and a drive device is installed inside the housing 100. The drive device meshes with the transmission teeth 600 to drive the rack 200 to move. The drive device is a common combination of gears and electric motors, and its installation method and specific structure are existing technologies, so they will not be described in detail.

[0031] Reference Figure 1 and Figure 2 As shown, the housing 100 has an opening 700, and a removable cover 800 is provided at the opening 700. The cover 800 is snap-fitted to the opening 700, and the opening 700 facilitates the user's operation of the reset handle 400. During normal use of the stapler, the cover 800 is installed at the opening 700 to prevent accidental operation. When the stapler blade 210 becomes stuck and cannot be retracted, the cover 800 is removed, and the reset handle 400 is operated through the opening 700.

[0032] Usage Instructions: During normal use of the stapler, the cover plate 800 is installed at the opening 700 to prevent accidental operation. When the stapler blade 210 becomes stuck and cannot retract, the user removes the cover plate 800 and operates the reset handle 400 through the opening 700. The user reciprocates by moving the reset handle 400. The reset handle 400 drives the first disc 310 and the second disc 330 to rotate back and forth around the blade shaft 500. When the first disc 310 rotates forward, the gear teeth 320 are in the first state, which can mesh with the retraction groove 220. Furthermore, when the first disc 310 rotates forward, the gear teeth 320 in the first state can drive the rack 200 to move backward. When the first disc 310 rotates in the reverse direction, the gear teeth 320 in the first state are pushed to the second state by the retraction groove 220, so the rack 200 cannot move when the first disc 310 rotates in the reverse direction. During the rotation of the gear tooth 320 from the first state to the second state, the protrusion compresses the elastic element 313, causing the elastic element 313 to undergo elastic deformation. After the gear tooth 320 separates from the relief groove 220, the elastic element 313 drives the gear tooth 320 to rotate from the second state to the first state via the protrusion. By switching the states of the gear tooth 320, the reciprocating rotation of the first disk 310 is manually controlled to drive the rack 200 to move backward unidirectionally.

[0033] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A stapler retraction structure, characterized in that, include: Casing (100); A rack (200) is inserted through the housing (100). The rack (200) can move along the length direction of the rack (200). One end of the rack (200) is connected to a stapler blade (210). Multiple retraction grooves (220) are provided on the rack (200) at intervals. A return wheel assembly (300) is rotatably mounted on the housing (100). The retraction groove (220) is located on the side of the rack (200) close to the return wheel assembly (300). When the return wheel assembly (300) rotates in the forward direction, it can drive the rack (200) to move away from the stapler blade (210) through the retraction groove (220). When the return wheel assembly (300) rotates in the reverse direction, the rack (200) remains stationary. A reset grip (400) is connected to the return wheel assembly (300), and the reset grip (400) is used to drive the return wheel assembly (300) to reciprocate.

2. The anastomosis device retraction structure according to claim 1, characterized in that: The return wheel assembly (300) includes a first disk (310) and gear teeth (320). A return shaft (500) is connected inside the housing (100). The first disk (310) is rotatably mounted on the return shaft (500). A rotating shaft (311) is eccentrically arranged on the first disk (310). The gear teeth (320) are rotatably mounted on the rotating shaft (311). The gear teeth (320) have a first state of extending out of the first disk (310) and a second state of retracting into the first disk (310). When the return wheel assembly (300) rotates forward, the gear teeth (320) are in the first state. The gear teeth (320) in the first state can mesh with the retraction groove (220). When the return wheel assembly (300) rotates in the reverse direction, the retraction groove (220) can push the gear teeth (320) to move to the second state.

3. The anastomosis device retraction structure according to claim 2, characterized in that: The first disk (310) is provided with a stop (312). When the gear tooth (320) rotates to the first state, the stop (312) abuts against the gear tooth (320).

4. The anastomosis device retraction structure according to claim 3, characterized in that: The first disk (310) is provided with an elastic element (313), which abuts against the gear teeth (320) and drives the gear teeth (320) to rotate from the second state to the first state.

5. The anastomosis device retraction structure according to claim 4, characterized in that: The gear teeth (320), the rotating shaft (311), and the stop block (312) are arranged in multiple sets around the return shaft (500).

6. The anastomosis device retraction structure according to claim 5, characterized in that: The first disk (310) has a positioning post (314) connected to its center. The elastic element (313) is annular and is sleeved on the positioning post (314).

7. The anastomosis device retraction structure according to claim 6, characterized in that: The first disk (310) is detachably connected to the second disk (330), and the gear teeth (320) are located between the first disk (310) and the second disk (330).

8. The anastomosis device retraction structure according to claim 7, characterized in that: The second disk (330) is provided with a first positioning groove (331) and a second positioning groove (332). The first positioning groove (331) is for the rotating shaft (311) to be inserted, and the second positioning groove (332) is for the stop block (312) to be inserted.

9. The anastomosis device retraction structure according to claim 1, characterized in that: The rack (200) has a transmission tooth (600) on its side, and a drive device is provided inside the housing (100). The drive device meshes with the transmission tooth (600) to drive the rack (200) to move.

10. The anastomosis device retraction structure according to claim 1, characterized in that: The housing (100) is provided with an opening (700), and a removable cover plate (800) is provided at the opening (700). The opening (700) facilitates operation of the reset grip (400).

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