Cartridge for surgical instrument and surgical instrument

Abstract

The present invention relates to a staple cartridge for a surgical instrument and a surgical instrument. The staple cartridge includes a staple cartridge body, suture staples disposed in the staple cartridge body, a pusher plate for pushing the suture staples, and a pushing block for pushing the pusher plate; the pushing block includes a bottom plate, two first cam groups arranged in parallel and perpendicular to the bottom plate, and two second cam groups arranged in parallel, the two first cam groups are located between the two second cam groups, and in the moving direction of the pushing block, the end of the first cam group is located in front of the end of the second cam group. By using a pushing block with cam groups of different lengths to push the pusher plate, the inner suture staples are fired first and the outer suture staples are fired later, so as to ensure better suture effect of the suture staples and avoid situations such as tissue leakage and wound bleeding.

Description

Technical Field

[0001] The present invention relates to a staple cartridge for a surgical instrument and a surgical instrument, belonging to the field of medical devices. Background Art

[0002] When a conventional linear cutting stapler is fired, a firing push rod is used to push a pusher plate disposed in the staple cartridge to complete the firing action of titanium staples. At the same time, a cutting blade at the distal end of the cutting knife rod lags behind the wedge head at the distal end of the firing push rod by 3-5 mm. When the user operates the firing push button to complete the firing action, the firing push rod and the cutting knife push rod move simultaneously. Due to the lag relationship between the wedge head of the push rod and the cutting blade, the titanium staples in the staple cartridge are formed first, and the cutting blade located 3-5 mm behind the push wedge head lags behind to cut the sutured tissue.

[0003] However, due to the short interval between suturing and cutting, when the U-shaped suturing staple is pushed by the wedge head at the distal end of the firing push rod to squeeze the titanium staple to form the B-shaped staple shape and is not yet stable, the immediately performed cutting action pulls the sutured tissue, causing tissue displacement and affecting the height and consistency of the formed staple. Eventually, there are phenomena such as large discreteness in the height of the formed staple and local bleeding after anastomosis. At the same time, the cutting blade of the existing structure is integrally formed with the distal end of the cutting knife rod. When the instrument is fired multiple times, the staple cartridge can be replaced, but the cutting blade cannot be replaced, which is prone to tumor cell implantation and metastasis.

[0004] Moreover, the existing stapler often has 2 or 3 rows of suture staple groups on its staple cartridge. During the firing process, multiple suture staples on the inner and outer sides at the same position are fired simultaneously. Due to their simultaneous firing, when the inner and outer suture staples contact and suture the tissue, they will squeeze the surrounding tissue outward, thereby affecting the suture effect of the tissue and causing situations such as tissue leakage and wound bleeding.

[0005] Based on the above situation, the present invention provides a staple cartridge with sequential inner and outer staple formation, which effectively reduces the maximum load during the operation of the instrument and improves the safety factor of the instrument. Summary of the Invention

[0006] The purpose of the present invention is to provide a staple cartridge for a surgical instrument and a surgical instrument. By using a pushing block with cam groups of different lengths to push the pusher plate, the inner suture staples are fired first and the outer suture staples are fired later, so as to ensure a better suture effect of the suture staples and avoid situations such as tissue leakage and wound bleeding. Moreover, the sequential inner and outer staple formation method effectively reduces the maximum load during the operation of the instrument and improves the safety factor of the instrument.

[0007] To achieve the above object, the present invention provides the following technical solution: A staple cartridge for a surgical instrument, comprising a staple cartridge body and suture staples arranged in the staple cartridge body, a pusher sheet for pushing the suture staples, and a pushing block for pushing the pusher sheet; The pushing block includes a bottom plate and two parallel first cam groups and two parallel second cam groups perpendicular to the bottom plate. The two first cam groups are located between the two second cam groups. In the moving direction of the pushing block, the end of the first cam group is located in front of the end of the second cam group.

[0008] Further, the staple cartridge body is provided with a channel for the pushing block to move in the longitudinal direction. The staple cartridge body is symmetrically provided with an inner suture cavity and an outer suture cavity on both sides with the channel as the axis of symmetry in the longitudinal direction. The inner suture cavity is relatively closer to the channel than the outer suture cavity; The suture staples include inner suture staples arranged in the inner suture cavity and outer suture staples arranged in the outer suture cavity. The first cam group pushes the inner suture staples out of the staple, and the second cam group pushes the outer suture staples out of the staple. The staple cartridge body has a contact surface in contact with the part to be sutured. There is a distance d1 between the crown of the inner suture staple and the contact surface, and a distance d2 between the crown of the outer suture staple and the contact surface. Among them, d1 is less than d2.

[0009] Further, the pusher sheet includes an inner pusher sheet arranged in the inner suture cavity and an outer pusher sheet arranged in the outer suture staple. The inner pusher sheet is arranged closer to the suture surface than the outer pusher sheet.

[0010] Further, the height of the inner pusher sheet is higher than the height of the outer pusher sheet.

[0011] Further, the shank of the inner suture staple is longer than the shank of the outer suture staple.

[0012] Further, the staple cartridge further includes a frame fixed to the bottom of the staple cartridge body and a cover plate covering the top of the staple cartridge body. The cover plate and the frame are mechanically connected to the staple cartridge.

[0013] Further, the staple cartridge further includes a cutter frame body and a cutter arranged on the cutter frame body. The staple cartridge body has a distal end and a proximal end arranged oppositely. The proximal end is connected to the connecting part of the surgical instrument, and the cutter frame body is arranged at the distal end; The cutter frame body includes a side plate and a clamping part that is clamped and matched with the pull rod of the cutter. An elastic member for driving the cutting edge of the cutter not to protrude from the cutter frame body is formed on the side plate.

[0014] Further, a rotating shaft is arranged on the side plate, the cutter is sleeved on the rotating shaft, and the elastic member is a torsion spring sleeved on the rotating shaft.

[0015] Further, the clamping portion is formed on the side plate.

[0016] Further, the side plates are two oppositely arranged plates, and a docking groove for accommodating the cutting knife is formed between the two side plates.

[0017] Further, the clamping portion is an elastic buckle bent from the side plate into the docking groove.

[0018] The present invention also provides a surgical instrument, including the cartridge for surgical instruments described above, an anvil assembly docked with the cartridge, a handle connecting the anvil assembly and the cartridge, and a closing pressure rod and a driving assembly arranged on the handle.

[0019] Further, a pusher rod and a knife pulling rod are further arranged in the handle. The pusher rod is connected to the driving assembly, and the knife pulling rod is arranged at the front end of the pusher rod; a clamping groove cooperating with the elastic buckle is arranged on the knife pulling rod. When the driving assembly drives the pusher rod to move towards the distal end, the pusher rod drives the knife pulling rod to move towards the distal end, so that the elastic buckle is buckled into the clamping groove.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: The cartridge for surgical instruments and the surgical instrument of the present invention push the staple pushing piece by using a pushing block with cam groups of different lengths. Among them, the first cam group is longer than the second cam group, that is, the end of the first cam group is located in front of the end of the second cam group, so that the inner suturing staple is fired first and the outer suturing staple is fired later, thereby ensuring better suturing effect of the suturing staple and avoiding situations such as tissue leakage and wound bleeding. At the same time, the method of forming staples in two steps on the inner and outer sides effectively reduces the maximum load during the operation of the instrument and improves the safety factor of the instrument use.

[0021] Moreover, the cartridge for surgical instruments and the surgical instrument of the present invention set the cutting knife at the distal end of the cartridge. After the suturing staple is fired, the knife pulling rod is docked with the cutting knife frame and pulled back towards the proximal end for cutting, that is, the tissue is cut after the fired suturing staple is completely formed, ensuring the stability of the forming process of the suturing staple, thereby realizing unified staple forming height and shape and reducing the purpose of bleeding and leakage at the anastomosis.

[0022] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly and implement it according to the content of the specification, the following takes the preferred embodiments of the present invention and describes them in detail in conjunction with the drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of a cartridge shown in an embodiment of the present invention;

[0024] Figure 2 The structural schematic diagram of the cartridge body in the cartridge shown in an embodiment of the present invention;

[0025] Figure 3 The structural schematic diagram of the pusher block in the cartridge shown in an embodiment of the present invention;

[0026] Figure 4 and Figure 5 The structural schematic diagram of the cutter carrier in the cartridge shown in an embodiment of the present invention;

[0027] Figure 6 and Figure 7 The structural schematic diagram of the surgical instrument shown in an embodiment of the present invention. Detailed implementation manners

[0028] The following combines the drawings and embodiments to further describe in detail the specific implementation manners of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0029] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "front", "rear", "axial direction", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0031] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] Please refer to Figures 1 to 5, a cartridge for a surgical instrument according to an embodiment of the present invention includes a cartridge body 1 and suture staples 10 disposed in the cartridge body 1, a pusher plate 11 for pushing the suture staples 10, a pushing block 2 for pushing the pusher plate 11, and a frame 12 fixed to the bottom of the cartridge body 1. When the cartridge is not in use, dust and the like can be prevented from entering the cartridge by covering the top of the cartridge body 1 with a cover plate (not shown). In this embodiment, the frame 12 and the cover plate are connected to the cartridge body 1 by ordinary mechanical connection means, such as snap connection, screw connection, etc. The cartridge body 1 has opposite distal and proximal ends (for example, in the present invention, the proximal end refers to the direction indicated by arrow A, and the distal end is the direction opposite to A). The distal end enters the tissue to be sutured first relative to the proximal end. After the cartridge is installed on the surgical instrument, the cover plate is removed. Figure 1 For example, in the present invention, the proximal end refers to the direction indicated by arrow A, and the distal end is the direction opposite to A. The distal end enters the tissue to be sutured first relative to the proximal end. After the cartridge is installed on the surgical instrument, the cover plate is removed.

[0033] In the present invention, the cartridge body 1 is provided with a channel 13 for the movement of the pushing block 2 in the longitudinal direction. The cartridge body 1 is symmetrically provided with an inner suture cavity 14 and an outer suture cavity 15 on both sides of the channel 13 as the axis of symmetry in the longitudinal direction. The inner suture cavity 14 is relatively closer to the channel 12 than the outer suture cavity 15. And the pusher plate 11 includes an inner pusher plate (not shown) disposed in the inner suture cavity 14 and an outer pusher plate (not shown) disposed in the outer suture cavity 15. The suture staples 10 include inner suture staples (not shown) disposed in the inner suture cavity 14 and outer suture staples (not shown) disposed in the outer suture cavity 15. The inner suture staples and the outer suture staples are respectively installed on the inner pusher plate and the outer pusher plate. During the suturing process, the outer suture staples are used to suture the area near the tissue anastomosis, and the inner suture staples suture the area inside the tissue relative to the outer suture staples. The pusher plate 11 in the present invention is a conventional structure, and the installation method of the suture staples 10 is also a conventional method, which will not be elaborated here.

[0034] In the present invention, the push block 2 includes a bottom plate 21, two first cam groups 22 and two second cam groups 23 arranged in parallel perpendicular to the bottom plate 21, and a stop block 24 arranged perpendicular to the bottom plate 21. The two first cam groups 22 are located between the two second cam groups 23, and the stop block 24 is arranged between the two first cam groups 22. In the moving direction of the push block 2, the end of the first cam group 22 is located in front of the end of the second cam group 23. The staple cartridge body 1 is also provided with a plurality of slide grooves 16 for accommodating the first cam group 22 and the second cam group 23. The first cam group 22 and the second cam group 23 can move relative to the slide grooves 16. The stop block 24 is arranged in the channel 12 to prevent the push block 2 from deviating from the moving direction and shaking when the push block 2 moves relative to the staple cartridge body 1. The first cam group 22 pushes the inner push nail piece to fire, so that the inner suture nail is ejected; the second cam group 23 pushes the outer push nail piece to fire, so that the outer suture nail is ejected. Since the end of the first cam group 22 is located in front of the end of the second cam group 23, when the push block 2 moves toward the distal end, it will first push the inner push nail piece to fire, thereby ensuring that the inner suture nail in the inner suture cavity 14 is ejected faster than the outer suture nail.

[0035] Furthermore, the staple cartridge body 1 has a contact surface 110 that contacts the sutured portion, a distance d1 is formed between the nail crown of the inner suture staple and the contact surface 110, and a distance d2 is formed between the nail crown of the outer suture staple and the contact surface 110, wherein d1 is smaller than d2, i.e., the fixed rod of the inner suture staple is arranged closer to the contact surface 110 than the nail rod of the outer suture staple. Specifically, in this embodiment, the inner push nail piece is arranged closer to the suture surface 110 than the outer push nail piece; of course, in other embodiments, an inner suture staple with a longer nail rod can be used, or the two can be combined, or the inner suture cavity 14 can be arranged higher than the outer suture cavity 15.

[0036] In the present invention, a cutting knife holder body 3 and a cutting knife 30 arranged on the cutting knife holder body 3 are also provided in the nail magazine body 1, and the cutting knife holder body 3 is arranged at the distal end. Specifically, the cutting knife holder body 3 includes a side plate 31 and a clamping portion 32 that is clamped and matched with the knife pull rod, and a rotating shaft 33 is provided on the side plate 31, and the cutting knife 30 is sleeved on the rotating shaft 33. An elastic member 34 that drives the blade (not shown) of the cutting knife 30 not to protrude from the cutting knife holder body 3 is also provided on the side plate 31. Preferably, the elastic member 34 is a torsion spring sleeved on the rotating shaft 33. In this embodiment, the clamping portion 32 is formed on the side plate 31, and the side plate 31 is two pieces arranged opposite to each other, and a docking groove 311 for accommodating the cutting knife 30 is formed between the two side plates 31. The clamping portion 32 is an elastic buckle formed by bending from the side plate 31 toward the docking groove 311.

[0037] Please combine with Figure 6 and Figure 7 In addition, the present invention further provides a surgical instrument, including the above-mentioned cartridge for surgical instruments, an anvil assembly 4 docked with the cartridge, a handle 5 connecting the anvil assembly 4 and the cartridge, and a closing pressure bar 51 and a driving assembly (not shown) provided on the handle 5. Among them, the closing pressure bar 51 is installed on the handle 5 through a guide pin 510, and a firing push button 52 connected to the driving assembly and used for manipulation is further provided on the handle 5. A staple pushing rod 53 and a knife pulling rod 54 are further provided in the handle 5. The staple pushing rod 53 is connected to the driving assembly. The knife pulling rod 54 and the pushing block 2 are arranged at the front end of the staple pushing rod 53, and a slot 541 matching with the elastic buckle 32 is provided on the knife pulling rod 54. When the driving assembly drives the staple pushing rod 53 to move towards the distal end, the staple pushing rod 52 drives the knife pulling rod 54 to move towards the distal end, so that the elastic buckle 32 is snapped into the slot 541. In the present invention, the handle 5 includes a cartridge support side handle 55 and an anvil side handle 56 respectively connected and fixed to the cartridge and the anvil assembly 4.

[0038] The working principle of the surgical instrument of the present invention is as follows:

[0039] After aligning the alignment guide pins of the cartridge holder side handle 55 and the anvil side handle 56, press the closing lever 51 to close the jaws (clamp the tissue to be sutured through the cartridge and anvil assembly 4). Push the proximal firing button 52 to drive the staple pusher rod 53 and the cutter bar 54 to move simultaneously. The two staple pusher rods 53 push the staple pusher plate 11 inside the cartridge to move vertically downward through the distal head bevel, realizing the sequential compression and deformation of the staples 10 to finally form B-shaped staples for suturing the tissue. Since the cutter bar 54 lags behind and is hidden inside the cartridge, it will not contact the tissue between the contact surface 110 and the anvil surface 41 during the staple forming process. When the staple pusher rod 53 is pushed to the distal end and all the staples 10 in the cartridge are formed, the cutter bar 54 contacts the cutter holder 3 inside the distal end of the cartridge. Since the cutter 30 is installed on the cutter holder 3 through the rotating shaft 33, when the cutter bar 54 is inserted into the docking groove 311, it will rotate and push out the cutter 30, and at the same time, the elastic buckle 32 on the side plate 31 is deformed and buckles the card slot 541 of the cutter bar 54. At this time, the stapling of the staples 10 is completed, and the pulling back process of the firing button 52 will drive the cutter 30 that has extended from the inside of the cutter holder 3 to cut the tissue from the distal end to the proximal end. During the cutting process, because both sides of the elastic buckle 32 inside the cutter holder 3 are held by the side wall of the cartridge surface, it cannot be deformed and separated from the cutter bar 54 until the complete cutting process of the tissue is completed. When the cutter 30 finishes cutting the tissue and runs to the proximal end of the cartridge, the proximal step of the cartridge (not shown) blocks the cutter holder 3. At the same time, the groove (not shown) on the proximal side of the cartridge allows the elastic buckle 32 to be deformed and disengaged, so that the cutter bar 54 is separated from the cutter holder 3. After the cutter bar 54 is separated from the cutter holder 3, the torsion spring 34 arranged on the rotating shaft 33 makes the cutter 30 automatically retract to prevent the exposed cutter 30 from accidentally scratching the user.

[0040] In summary: The cartridge for a surgical instrument and the surgical instrument of the present invention push the staple pusher plate by using a pusher block with cam groups of different lengths. Among them, the first cam group is longer than the second cam group, that is, the end of the first cam group is located in front of the end of the second cam group, so that the inner staples are fired first and the outer staples are fired later, thus ensuring better suture effect of the staples and avoiding tissue leakage, wound bleeding and other situations. At the same time, the method of forming staples in steps on the inner and outer sides effectively reduces the maximum load during the operation of the instrument and improves the safety factor of the instrument use.

[0041] Moreover, the cartridge for a surgical instrument and the surgical instrument set the cutter at the distal end of the cartridge. After the staples are fired, the cutter bar is docked with the cutter holder and pulled back proximally for cutting, that is, the tissue is cut after the fired staples are completely formed, ensuring the stability of the staple forming process, thereby realizing unified staple height and shape and reducing the bleeding and leakage at the anastomosis.

[0042] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0043] The above-described embodiments only express several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. A staple cartridge for a surgical instrument, characterized in that, It includes a staple cartridge body, suturing staples arranged in the staple cartridge body, a pusher plate for pushing the suturing staples, and a pushing block for pushing the pusher plate; the pushing block includes a bottom plate, and two first cam groups arranged in parallel and perpendicular to the bottom plate and two second cam groups arranged in parallel. The two first cam groups are located between the two second cam groups. In the moving direction of the pushing block, the end of the first cam group is located on the front side of the end of the second cam group. The staple cartridge further includes a cutter holder and a cutter arranged on the cutter holder. The staple cartridge body has a distal end and a proximal end arranged oppositely. The proximal end is connected to the connecting part of the surgical instrument, and the cutter holder is arranged at the distal end; the cutter holder includes side plates and a clamping part that is clamped and matched with a pull rod. An elastic member for driving the cutting edge of the cutter not to protrude from the cutter holder is formed on the side plates. A step is arranged on the proximal end of the staple cartridge. When the cutter finishes cutting the tissue and runs to the proximal end of the staple cartridge, the step at the proximal end of the staple cartridge blocks the cutter holder. At the same time, the groove on the side of the proximal end of the staple cartridge allows the elastic buckle to deform and disengage, so that the pull rod is disengaged from the cutter holder. After the pull rod is disengaged from the cutter holder, the elastic member arranged on the rotating shaft makes the cutter automatically retract. A rotating shaft is arranged on the side plates, the cutter is sleeved on the rotating shaft, and the elastic member is a torsion spring sleeved on the rotating shaft. The clamping part is formed on the side plates. The side plates are two relatively arranged ones, and a docking groove for accommodating the cutter is formed between the two side plates. The clamping part is an elastic buckle bent from the side plates towards the docking groove.

2. The cartridge for a surgical instrument according to claim 1, wherein, A channel for the pushing block to move is arranged on the staple cartridge body in the longitudinal direction. The staple cartridge body is symmetrically provided with an inner suturing cavity and an outer suturing cavity on the left and right sides with the channel as the symmetry axis in the longitudinal direction. The inner suturing cavity is arranged closer to the channel than the outer suturing cavity; the suturing staples include inner suturing staples arranged in the inner suturing cavity and outer suturing staples arranged in the outer suturing cavity. The first cam group pushes the inner suturing staples to eject, and the second cam group pushes the outer suturing staples to eject. The staple cartridge body has a contact surface in contact with the part to be sutured. A distance d1 is formed between the crown of the inner suturing staple and the contact surface, and a distance d2 is formed between the crown of the outer suturing staple and the contact surface. Among them, d1 is less than d2.

3. The cartridge for a surgical instrument according to claim 2, wherein, The pusher plate includes an inner pusher plate arranged in the inner suturing cavity and an outer pusher plate arranged in the outer suturing staple. The inner pusher plate is arranged closer to the suturing surface than the outer pusher plate.

4. The cartridge for a surgical instrument according to claim 3, characterized in that, The height of the inner pusher plate is higher than the height of the outer pusher plate.

5. A surgical instrument, characterized in that, It includes a staple cartridge for a surgical instrument according to any one of claims 1 to 4, an anvil assembly docked with the staple cartridge, a handle connecting the anvil assembly and the staple cartridge, and a closing pressure bar and a driving assembly arranged on the handle.

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