Large jaw type staple cartridge assembly for a stapler and large jaw stapler

Abstract

This utility model relates to the field of medical device technology, and in particular to a large-jaw stapler assembly and a large-jaw stapler. The large-jaw stapler assembly includes an anvil with a connecting port at one end; a staple cartridge with a connecting pin movably inserted into the connecting port at one end; and a second elastic member disposed between the anvil and the staple cartridge. After the connecting pin is inserted into the connecting port, a certain travel gap remains between the inner wall of the connecting port and the connecting pin. The second elastic member is used to spread the anvil and the staple cartridge at a certain angle. This design ensures that during anastomosis, the anvil remains stationary while the staple cartridge moves to avoid tearing tissue, and also ensures that the opening between the anvil and the staple cartridge is sufficiently large.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a large-jaw staple cartridge assembly and a large-jaw stapler. Background Technology

[0002] Existing staplers typically consist of a stapler assembly, a firing assembly, and a staple cartridge assembly. The staple cartridge assembly includes an anvil and a staple cartridge seat. The anvil and staple cartridge seat are driven by the stapler assembly to fit together (i.e., close and compress the tissue) or open. After the fit is made together, the firing assembly drives the cutting blade to cut the tissue, and the firing assembly also drives the staple pusher slider of the staple cartridge assembly to perform stapleing on the cut tissue.

[0003] For example, the Chinese utility model patent application with publication number CN118902524A (hereinafter referred to as Document 1) discloses a stapler closure structure, a high-safety stapler and method. Through the stapler closure structure, the anvil 1 remains stationary during the closure action, while the staple cartridge seat 2 moves and moves towards the anvil 1 until it is closed. In this way, after the doctor passes the anvil 1 through the blood vessel and slightly tightens the blood vessel, the anvil 1 will not tear the blood vessel when the stapler closes, thus making the stapler more suitable for anastomosis of vascular procedures (see its specification for details).

[0004] However, in the staple cartridge assembly of document 1, the opening between the anvil and the staple cartridge seat is small when opened, making it impossible to effectively compress the anastomotic tissue during surgery.

[0005] Therefore, there is an urgent need for a stapler assembly that can ensure anastomosis (i.e., stapler assembly closure) without tearing the tissue during anastomosis, while also allowing for a larger opening. Utility Model Content

[0006] The purpose of this invention is to provide a large-jaw staple cartridge assembly and a large-jaw stapler to address the shortcomings of existing technologies, aiming to achieve a staple cartridge assembly that can achieve a larger opening without tearing tissue during anastomosis.

[0007] This utility model achieves the above-mentioned objective through the following technical solution: a large jaw type staple cartridge assembly for a stapler, comprising:

[0008] The anvil has a connector at one end;

[0009] The staple cartridge holder has a connecting pin that can be movably inserted into the connection port at one end;

[0010] The second elastic element is disposed between the anvil and the staple cartridge.

[0011] Among them, after the connecting pin is inserted into the connecting port, there is a certain travel gap between the inner wall of the connecting port and the connecting pin; the second elastic element is used to spread the anvil seat and the nail cartridge seat at a certain angle.

[0012] Furthermore, the pin holder is provided with a first spring mounting position, and the pin cartridge holder is provided with a second spring mounting position;

[0013] The second elastic element is a return spring, with one end installed at the first spring mounting position and the other end installed at the second spring mounting position.

[0014] Furthermore, the end of the pin holder near the connection port and the end of the pin cartridge near the connecting pin constitute a matching guide position, and a matching drive ring is sleeved on the matching guide position.

[0015] Furthermore, a guide transition slope is provided on one side of the matching guide position.

[0016] Furthermore, the staple cartridge holder is equipped with a staple cartridge with a built-in staple pusher slider, and the staple abutment is provided with a safety boss and a first elastic element on the side of the staple cartridge holder near the staple cartridge holder.

[0017] A large jaw type stapler, comprising the large jaw type staple cartridge assembly of any of the aforementioned staplers.

[0018] Furthermore, the large jaw type staple cartridge assembly of the stapler also includes:

[0019] The firing assembly includes a cutting blade that is pressed down by the elastic force of a first elastic member, the cutting blade being provided with a first guide boss and an unlocking part;

[0020] When the pin holder and the pin cartridge are closed and the cutting blade is pressed down, the first guide boss is flush with the safety boss; the unlocking part is lifted and released by the pusher slider.

[0021] Furthermore, the first guide boss is disposed on the top of the cutting blade, and the anvil is provided with a first guide groove into which the first guide boss is inserted and adjacent to the safety boss;

[0022] The unlocking part has a sloping structure and is located at the bottom of the cutting blade, and is supported by the push pin slider located in the initial position;

[0023] The top of the cutting blade is also formed with a spring-loaded force application position, and the bottom is also provided with a second guide boss;

[0024] The first elastic element is a reset spring, with one end of the reset spring mounted on the pin seat and the other end bent and embedded in the spring force application position;

[0025] The staple cartridge seat is provided with a second guide groove into which a second guide boss inserts.

[0026] As discovered by the inventor, to avoid tearing of tissue, Document 1 changes the traditional mating action structure where the anvil moves and the cartridge seat remains stationary, to a structure where the cartridge seat moves while the anvil remains stationary. However, this results in a smaller opening for the cartridge assembly in Document 1. See the appendix of Document 1. Figure 5 This is because both the engagement and disengagement of the staple cartridge assembly require the connecting sleeve 411 to be pushed and pulled. When the connecting sleeve 411 is pushed forward, the staple cartridge assembly engages. When the staple cartridge assembly disengages, the connecting sleeve 411 retracts and engages with the first limiting protrusion 211 through the clearance opening 411a, thereby pulling the staple cartridge seat to engage with the anvil. This design of the action structure requires the anvil to have a guide position 11 and the staple cartridge seat to have a hinge portion 215 for the insertion stroke guide position 11. A sufficiently long gap needs to be reserved between the inner wall of the stroke guide position 11 and the hinge portion 215. That is, the stroke guide position 11 needs to be designed as a structure similar to an elongated hole to achieve the engagement (i.e., closing) and disengagement of the staple cartridge seat while the anvil remains stationary. However, the design of the elongated hole of the stroke guide position 11 will inevitably result in a smaller opening angle between the anvil and the staple cartridge seat.

[0027] To overcome the shortcomings of existing technologies such as the small opening of the staple cartridge assembly mentioned in Reference 1, this solution incorporates a second elastic element between the anvil and the staple cartridge seat. This allows for the automatic and effective opening of both the anvil and the staple cartridge seat, eliminating the need for pulling the connecting sleeve to open the staple cartridge assembly as required in Reference 1. Therefore, the travel gap between the inner wall of the connecting port and the connecting pin in this solution is sufficiently small. This design ensures that during anastomosis, the anvil remains stationary while the staple cartridge seat moves to avoid tearing tissue. Simultaneously, it ensures that the opening between the anvil and the staple cartridge seat is large enough to form a large-jaw staple cartridge assembly and a large-jaw stapler, making it more suitable for various surgical environments and effectively avoiding the adverse effects caused by the small opening of the staple cartridge assembly. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the anastomosis device of this utility model.

[0029] Figure 2 This is a partial structural decomposition and enlarged schematic diagram of the present invention.

[0030] Figure 3 for Figure 1 The enlarged structural diagram at point A shows the structure of the staple cartridge assembly in the open state.

[0031] Figure 4 for Figure 3 The structure is intended to be decomposed.

[0032] Figure 5 This is a cross-sectional structural diagram of the staple cartridge assembly of this utility model.

[0033] Figure 6 for Figure 5 A structural decomposition diagram.

[0034] Figure 7 This is an exploded view of the staple cartridge assembly of this utility model, as well as a partial cross-sectional structural diagram.

[0035] Figure 8 This is a schematic diagram of the cutting blade of this utility model in the pressed and lifted states. In the upper figure, the cutting blade is pressed down by the first elastic element, and in the lower figure, the cutting blade is lifted by the push pin slider.

[0036] Figure 9 This is a schematic diagram of the anvil and cutting blade of this utility model from a downward viewing angle.

[0037] The reference numerals in the figures include:

[0038] 1—Sticking container component,

[0039] 11—Anchor seat, 12—Stick cartridge seat, 13—Stick cartridge, 14—Second elastic element, 15—Matching guide position.

[0040] 111—Security boss, 112—First elastic element, 113—First guide groove, 114—Connection port, 115—First spring mounting position.

[0041] 114a—Stroke gap,

[0042] 121—Connecting pin, 122—Second spring mounting position, 123—Second guide groove,

[0043] 131—Push nail slider,

[0044] 131a—Platform tool section; 151—Guide transition slope;

[0045] 2—Firing assembly,

[0046] 21—Cut blade,

[0047] 211—First guide boss, 212—Unlocking part, 213—Spring force application position, 214—Second guide boss;

[0048] 3—Matching components,

[0049] 31—Matching drive ring. Detailed Implementation

[0050] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. It is understood that the accompanying drawings are provided for reference and illustration only, and are not intended to limit the present utility model. The connection relationships shown in the drawings are only for clear description and do not limit the connection method.

[0051] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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, and therefore should not be construed as a limitation of this utility model. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances. The terminology used in this specification of this utility model is only for the purpose of describing specific embodiments and is not intended to limit this utility model.

[0052] like Figures 1-9 As shown in the figure, this utility model embodiment provides a stapler for preventing secondary firing and preventing excessively thick tissue firing, including: a staple cartridge assembly 1 and a firing assembly 2. Wherein:

[0053] The staple cartridge assembly 1 includes a staple anchor 11 and a staple cartridge seat 12 for mounting a staple cartridge 13 with a staple pusher slider 131. The staple anchor 11 is provided with a safety boss 111 and a first elastic member 112 on the side near the staple cartridge seat 12.

[0054] The firing assembly 2 includes a cutting blade 21 that is pressed down by the elastic force of the first elastic member 112. The cutting blade 21 is provided with a first guide boss 211 and an unlocking part 212.

[0055] When the pin holder 11 and the pin cartridge 12 are closed and the cutting blade 21 is pressed down, the movement path of the first guide boss 211 passes through the safety boss 111, that is, the first guide boss 211 and the safety boss 111 are flush, ensuring that the safety boss 111 can block the first guide boss 211 to prevent the cutting blade 21 from advancing when the cutting blade 21 is pressed down; the unlocking part 212 is pushed by the pin pusher slider 131 to lift the cutting blade 21, and release the cutting blade 21 to release the safety.

[0056] This solution provides a guide boss and a beveled unlocking part 212 on the cutting blade 21, and a safety boss 111 and a first elastic element 112 on the anvil 11. Combined with whether the pusher slider 131 is in the initial position and closed with the cartridge assembly 1, the cutting blade 21 is mechanically locked and mechanically unlocked during firing. This ensures that the cutting blade 21 is only allowed to move forward and complete firing when a brand-new cartridge 13 is installed and the tissue thickness meets the design requirements, or when the cartridge assembly 1 is not fully closed. This effectively avoids secondary firing of the used cartridge 13 and accidental firing of excessively thick tissue, thus improving the safety and reliability of anastomosis surgery.

[0057] Furthermore, the staple cartridge 12 is equipped with a staple cartridge 13, and the unlocking part 212 is pushed against by the staple pusher slider 131 located in the initial position of the staple cartridge 13 to lift the cutting blade 21;

[0058] The first guide boss 211 is disposed on the top of the cutting blade 21, and the anvil seat 11 is provided with a first guide groove 113 inserted by the first guide boss 211 and adjacent to the safety boss 111;

[0059] The unlocking part 212 has a beveled structure and is located at the bottom of the cutting blade 21, and is abutted by the pusher slider 131 located in the initial position. Specifically, the pusher slider 131 has a bench blade part 131a for abutting the unlocking part 212.

[0060] Furthermore, the top of the cutting blade 21 is also formed with a spring-loaded force application position 213, and the bottom is also provided with a second guide boss 214;

[0061] The first elastic element 112 is a reset spring. One end of the reset spring is installed on the pin seat 11, and the other end is bent and embedded in the spring force application position 213 to apply downward spring force to the cutting blade 21.

[0062] The staple cartridge 12 is provided with a second guide groove 123 into which the second guide boss 214 is inserted.

[0063] Furthermore, a connector 114 is provided at one end of the anvil 11;

[0064] One end of the staple cartridge seat 12 is provided with a connecting pin 121 that is movably inserted into the connecting port 114; a second elastic element 14 is provided between the staple seat 11 and the staple cartridge seat 12;

[0065] Wherein, after the connecting pin 121 is inserted into the connecting port 114, a certain travel gap 114a is left between the inner wall of the connecting port 114 and the connecting pin 121; the second elastic member 14 is used to spread the anvil seat 11 and the nail cartridge seat 12 apart to form a certain angle.

[0066] Furthermore, the pin holder 11 is provided with a first spring mounting position 115, and the pin cartridge holder 12 is provided with a second spring mounting position 122;

[0067] The second elastic element 14 is a reset spring, with one end installed at the first spring mounting position 115 and the other end installed at the second spring mounting position 122.

[0068] Furthermore, the end of the pin seat 11 near the connection port 114 and the end of the pin cartridge seat 12 near the connecting pin 121 form a matching guide position 15;

[0069] The anti-secondary-firing and anti-excessive-tissue-firing stapler also includes a stapler assembly 3, which includes a stapler drive ring 31 fitted onto the stapler guide position 15.

[0070] Furthermore, a guide transition slope 151 is provided on one side of the matching guide position 15.

[0071] A method for preventing secondary firing of a stapler during anastomosis, comprising the following steps:

[0072] S1. Drive the anastomosis assembly 3 to close the anastomosis seat 11 and the staple cartridge seat 12 and clamp the work to be processed;

[0073] S2. Determine whether the pusher slider 131 in the staple cartridge 13 is in the initial position at this time:

[0074] If the pusher slider 131 is in the initial position, the pusher slider 131 pushes against the inclined unlocking part 212 of the cutting blade 21, causing the cutting blade 21 to rise and the first guide boss 211 of the cutting blade 21 to avoid the safety boss 111 on the pin seat 11, thereby releasing the mechanical lock on the cutting blade 21.

[0075] If the pusher slider 131 is not in the initial position, the cutter 21 remains pressed down under the action of the first elastic member 112. The first guide boss 211 of the cutter 21 remains flush with the safety boss 111 on the pin seat 11. The safety boss 111 continuously blocks the first guide boss 211, and the cutter 21 is locked, stopping the firing action.

[0076] S3. After the cutting blade 21 has finished lifting and the first guide boss 211 has avoided the safety boss 111, the firing assembly 2 drives the cutting blade 21 to move forward, inserts the suture nail into the object to be processed and pushes the pusher slider 131 forward to complete the suturing or fixing.

[0077] S4. After firing, reverse drive the mating assembly 3, and use the elastic force of the second elastic element 14 to open the anvil 11 and the staple cartridge seat 12, releasing the fired staple cartridge 13 and separating it from the object to be processed.

[0078] A method for firing a stapler to prevent the use of excessively thick materials, comprising the following steps:

[0079] S1. Drive the mating assembly 3 to bring the anvil seat 11 and the staple cartridge seat 12 together along a predetermined trajectory and clamp the work to be processed;

[0080] S2. After the pin holder 11 contacts the pin cartridge holder 12, a clamping angle is formed between them:

[0081] If the clamping angle is greater than the preset threshold, the cutting blade 21 remains in the pressed state under the action of the first elastic member 112, and its first guide boss 211 remains flush with the safety boss 111 on the anvil seat 11. The safety boss 111 continues to block the first guide boss 211, and the cutting blade 21 is mechanically locked, terminating the subsequent firing action.

[0082] If the clamping angle is less than or equal to a preset threshold, then step S3 is executed;

[0083] S3. Determine whether the pusher slider 131 in the staple cartridge 13 is in the initial position at this time:

[0084] If the pusher slider 131 is in the initial position, the pusher slider 131 will push against the inclined unlocking part 212 of the cutting blade 21, causing the cutting blade 21 to rise and its first guide boss 211 to avoid the safety boss 111 on the pin seat 11, thereby releasing the mechanical lock on the cutting blade 21.

[0085] If the pusher slider 131 is not in the initial position, the cutter 21 remains pressed down under the action of the first elastic member 112, and its first guide boss 211 is flush with the safety boss 111 on the pin seat 11. The safety boss 111 continues to block the first guide boss 211, the cutter 21 is locked, and the firing action is terminated.

[0086] S4. After the cutting blade 21 has finished lifting and the first guide boss 211 has avoided the safety boss 111, the firing assembly 2 drives the cutting blade 21 to move forward to cut the object to be processed and pushes the pusher slider 131 forward to complete the nailing action.

[0087] Furthermore, the following steps are included after step S4:

[0088] S5. After firing, reverse drive the mating assembly 3, and use the elastic force of the second elastic element 14 to open the anvil 11 and the staple cartridge seat 12, and open the jaws to remove the used staple cartridge 13.

[0089] In step S2, the preset threshold is the clamping angle corresponding to the maximum acceptable thickness of the material to be processed, determined according to the design requirements of the stapler. When the material to be processed is too thick, causing the actual clamping angle when the two closes to exceed the threshold, it is considered an overly thick material to be processed, thereby triggering mechanical locking to prevent accidental firing. Specifically, the preset threshold is determined by the clamping angle formed between the staple seat 11 and the staple cartridge seat 12 when the pusher slider 131 just pushes out the first guide boss 211 of the cutting blade 21, so that the safety boss 111 can just release the cutting blade 21.

[0090] This plan:

[0091] By providing a first guide boss 211 and an unlocking part 212 with a beveled structure on the cutting blade 21, and a first elastic member 112 for pressing down the cutting blade 21 on the anvil seat 11, and a safety boss 111 on the anvil seat 11 to block the first guide boss 211 of the cutting blade 21 when it is pressed down in the mating state, i.e., the nail cartridge assembly 1 is closed, thereby blocking the cutting blade 21 to play a safety role; the unlocking part 212 with a beveled structure is used so that when the nail cartridge 13 is inserted into the nail cartridge seat 12, the nail cartridge 13 can lift the cutting blade 21 by abutting the unlocking part 212 in the mating state, so that the first guide boss 211 of the cutting blade 21 can be lifted and avoid the obstruction of the safety boss 111, thereby realizing the safety unlocking.

[0092] Thus, when a brand-new, unused staple cartridge 13 is inserted into the staple cartridge holder 12, the pusher slider 131 is in the initial position of the new staple cartridge 13. When inserted, in a fitted state, it can lift the cutting blade 21, allowing the cutting blade 21 to disengage and enabling the firing assembly 2 to fire the cutting blade 21 normally, moving it forward. The forward-moving cutting blade 21 pushes the pusher slider 131 away from the initial position until the firing and sewing action is completed. However, if a used staple cartridge 13 is fired, or if a fired staple cartridge 13 is mistakenly inserted, the pusher slider 131 of the staple cartridge 13 will not be in the initial position because it has been pushed forward, and it will inevitably be unable to lift the cutting blade 21. In this case, the cutting blade 21 will be pressed down under the action of the first elastic member 112, making the first guide boss 211 flush with the safety boss 111. The movement path of the first guide boss 211 passes through the safety boss 111. When firing, the safety boss 111 can block the cutting blade 21 from moving forward by blocking the first guide boss 211, and the safety will be activated. This effectively avoids secondary firing of the stapler into the staple cartridge assembly 1, and also avoids the safety hazard of only cutting without staples when firing in the empty staple cartridge 13 state.

[0093] In addition, this solution can effectively prevent the stapler from cutting excessively thick tissue, allowing for a preliminary assessment of tissue thickness and effectively reducing the safety hazards associated with cutting and anastomosing excessively thick tissue. Alternatively, it can be understood as effectively preventing accidental cutting when the staple cartridge assembly 1 of the stapler is not fully closed. Specifically, when the staple cartridge assembly 1 is anastomosed with excessively thick tissue, the staple seat 11 and the staple cartridge seat 12 cannot be effectively closed, inevitably forming an angle exceeding a predetermined value. If the staple cartridge assembly 1 is not fully closed, the pusher slider 131 cannot fully lift to release the cutting blade 21, and the first guide boss 211 cannot fully avoid the release of the safety boss 111. The safety remains active, effectively preventing the firing action from anastomosing excessively thick tissue, or preventing accidental firing caused by insufficient closure of the staple cartridge assembly 1, further reducing safety hazards.

[0094] A large jaw type staple cartridge assembly 1 for a stapler includes:

[0095] The anvil 11 has a connector 114 at one end;

[0096] The staple cartridge 12 has a connecting pin 121 that can be movably inserted into the connecting port 114 at one end;

[0097] The second elastic element 14 is disposed between the pin seat 11 and the pin cartridge seat 12;

[0098] Wherein, after the connecting pin 121 is inserted into the connecting port 114, a certain travel gap 114a is left between the inner wall of the connecting port 114 and the connecting pin 121; the second elastic member 14 is used to spread the anvil seat 11 and the nail cartridge seat 12 apart to form a certain angle.

[0099] Furthermore, the pin holder 11 is provided with a first spring mounting position 115, and the pin cartridge holder 12 is provided with a second spring mounting position 122; the second elastic element 14 is a reset spring, with one end installed at the first spring mounting position 115 and the other end installed at the second spring mounting position 122.

[0100] Furthermore, the end of the pin seat 11 near the connection port 114 and the end of the pin cartridge seat 12 near the connecting pin 121 constitute a matching guide position 15, and the matching guide position 15 is fitted with a matching drive ring 31.

[0101] Furthermore, a guide transition slope 151 is provided on one side of the matching guide position 15.

[0102] Furthermore, the staple cartridge seat 12 is equipped with a staple cartridge 13 with a built-in staple pusher slider 131, and the staple abutment 11 is provided with a safety boss 111 and a first elastic member 112 on the side near the staple cartridge seat 12.

[0103] A large jaw type stapler includes a large jaw type staple cartridge assembly 1 of any of the aforementioned staplers.

[0104] Furthermore, the large jaw type staple cartridge assembly 1 of the stapler also includes:

[0105] The firing assembly 2 includes a cutting blade 21 that is pressed down by the elastic force of the first elastic member 112. The cutting blade 21 is provided with a first guide boss 211 and an unlocking part 212.

[0106] When the nail anchor 11 and the nail cartridge 12 are closed and the cutting blade 21 is pressed down, the first guide boss 211 is flush with the safety boss 111; the unlocking part 212 is pushed up by the nail pusher slider 131 to lift and release the cutting blade 21.

[0107] Furthermore, the first guide boss 211 is disposed on the top of the cutting blade 21, and the anvil seat 11 is provided with a first guide groove 113 inserted by the first guide boss 211 and adjacent to the safety boss 111;

[0108] The unlocking part 212 has a sloping structure and is located at the bottom of the cutting blade 21, and is pushed against the unlocking part 212 by the push pin slider 131 located in the initial position;

[0109] The top of the cutting blade 21 is also formed with a spring-loaded force application position 213, and the bottom is also provided with a second guide boss 214;

[0110] The first elastic element 112 is a reset spring, with one end of the reset spring mounted on the pin seat 11 and the other end bent and embedded in the spring force application position 213;

[0111] The staple cartridge 12 is provided with a second guide groove 123 into which the second guide boss 214 is inserted.

[0112] As discovered by the inventor, to avoid tearing of tissue, Document 1 changes the conventional mating action structure where the anvil 11 moves and the staple cartridge 12 remains stationary, to a structure where the staple cartridge 12 moves while the anvil 11 remains stationary. However, this results in a smaller opening for the staple cartridge assembly 1 in Document 1. (See Appendix of Document 1 for details.) Figure 5 This is because both the engagement and disengagement of the staple cartridge assembly 1 and the staple cartridge assembly 1 require the connecting sleeve to be pushed and pulled. When the connecting sleeve is pushed forward, the staple cartridge assembly 1 is engaged. When the staple cartridge assembly 1 is disengaged, the connecting sleeve is pulled back and the first limiting protrusion is locked through the clearance opening, so as to pull the staple cartridge seat 12 to engage with the staple abutment seat 11. This design of the action structure requires a guide position to be set on the staple abutment seat 11 and a hinge part to be set on the staple cartridge seat 12 for the insertion stroke guide position. A sufficiently long gap needs to be reserved between the inner wall of the stroke guide position and the hinge part. That is, the stroke guide position needs to be set into a structure similar to an elongated hole in order to achieve the engagement, closing and opening action of the staple cartridge seat 12 moving while the staple abutment seat 11 is stationary. However, the design of the elongated hole of the stroke guide position will inevitably result in a small opening angle between the staple abutment seat 11 and the staple cartridge seat 12.

[0113] In order to overcome the shortcomings of the small opening of the staple cartridge assembly 1 in the prior art, such as the aforementioned document 1, this solution incorporates a second elastic element 14 between the anvil 11 and the staple cartridge seat 12. This design can automatically and effectively open the anvil 11 and the staple cartridge seat 12, eliminating the need for pulling the connecting sleeve to open the staple cartridge assembly 1 as in document 1. Therefore, the travel gap 114a reserved between the inner wall of the connecting port 114 and the connecting pin 121 in this solution is small enough. This ensures that during anastomosis, the anvil 11 remains stationary while the staple cartridge seat 12 moves to avoid tearing tissue, while also ensuring that the opening between the anvil 11 and the staple cartridge seat 12 is large enough to form a large-jaw staple cartridge assembly 1 and a large-jaw stapler, which is more conducive to various surgical environments and effectively avoids the adverse effects caused by the small opening of the staple cartridge assembly 1.

[0114] During anastomosis of the staple cartridge assembly 1, the anastomosis assembly 3 (i.e., the barrel) pushes the anastomosis drive ring 31. The anastomosis drive ring 31 slides in the anastomosis guide position 15 until it presses against the guide transition slope 151 at the end. The anvil 11 remains stationary, while the staple cartridge seat 12, under the force of the anastomosis drive ring 31, gradually moves towards the anvil 11 until it closes with the anvil 11. The second elastic element 14 generates elastic force. When anastomosing vascular tissues, for example, the anvil 11 needs to be inserted into the blood vessel. If the anvil 11 moves during anastomosis, it will inevitably tear the tissue, creating a safety hazard. The structural design of the anastomosis action, where the anvil 11 remains stationary while the staple cartridge seat 12 moves, effectively avoids the problem of tissue tearing during anastomosis. Furthermore, the design of the second elastic element 14 also ensures the opening design of the large jaw of the staple cartridge assembly 1, which is more conducive to anastomosis surgery.

[0115] When the staple cartridge assembly 1 is opened, the reverse drive ring 31 is driven to remove the forward pushing force applied by the snapping drive ring 31 to the staple cartridge assembly 1. Then the second elastic element 14 releases its elastic force to pop open the staple cartridge seat 12, so that the staple seat 11 and the staple cartridge seat 12 form a jaw with a large included angle.

[0116] Finally, it should be noted that any cross-referencing or superposition of the various embodiments of this solution by those skilled in the art still falls within the original disclosure scope of this solution. Furthermore, the above descriptions are merely preferred embodiments of this utility model and are not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A large jaw type staple cartridge assembly for a stapler, characterized in that, include: The anvil (11) has a connector (114) at one end; The staple holder (12) has a connecting pin (121) that can be movably inserted into the connecting port (114) at one end; The second elastic element (14) is disposed between the pin seat (11) and the pin cartridge seat (12); The second elastic element (14) is used to spread the anvil (11) and the staple cartridge (12) at a certain angle.

2. The large jaw, staple cartridge assembly of the stapler of claim 1, wherein, After the connecting pin (121) is inserted into the connecting port (114), a certain travel gap (114a) is left between the inner wall of the connecting port (114) and the connecting pin (121); The pin holder (11) is provided with a first spring mounting position (115), and the pin cartridge holder (12) is provided with a second spring mounting position (122); the second elastic element (14) is a reset spring, with one end installed at the first spring mounting position (115) and the other end installed at the second spring mounting position (122).

3. The large jaw, staple cartridge assembly of the stapler of Claim 2 wherein, The end of the pin seat (11) near the connector (114) and the end of the pin cartridge seat (12) near the connector pin (121) form a matching guide position (15), and the matching guide position (15) is fitted with a matching drive ring (31).

4. The large jaw, staple cartridge assembly of the stapler of claim 1, wherein, A guide transition slope (151) is provided on one side of the matching guide position (15).

5. The large jaw, staple cartridge assembly of the stapler of claim 1 wherein, The staple cartridge seat (12) is equipped with a staple cartridge (13) with a built-in staple pusher slider (131), and the staple abutment (11) is provided with a safety boss (111) and a first elastic member (112) on the side near the staple cartridge seat (12).

6. A large jaw type stapler characterized by, The staple cartridge assembly of the stapler as described in any one of claims 1-5 includes a large jaw type.

7. A large jaw type stapler characterized by, The stapler assembly with large jaws as described in claim 5 further includes: The firing assembly (2) includes a cutting blade (21) that is pressed down by the elastic force of the first elastic member (112). The cutting blade (21) is provided with a first guide boss (211) and an unlocking part (212). When the pin seat (11) and the pin cartridge seat (12) are closed and the cutting blade (21) is pressed down, the first guide boss (211) is flush with the safety boss (111); the unlocking part (212) is pushed by the pin pusher slider (131) to lift and release the cutting blade (21).

8. The large jawed stapler according to claim 7, wherein, The first guide boss (211) is disposed on the top of the cutting blade (21), and the anvil seat (11) is provided with a first guide groove (113) inserted by the first guide boss (211) and adjacent to the safety boss (111); The unlocking part (212) has a sloping structure and is located at the bottom of the cutting blade (21), and is pushed against the unlocking part (212) by the pusher slider (131) located in the initial position; The top of the cutting blade (21) is also formed with a spring force application position (213), and the bottom is also provided with a second guide boss (214); The first elastic element (112) is a reset spring. One end of the reset spring is installed on the pin seat (11), and the other end is bent and embedded in the spring force application position (213). The staple cartridge seat (12) is provided with a second guide groove (123) into which the second guide boss (214) is inserted.

Images