An electric stapler with multi-level overload protection

Abstract

The present invention relates to the technical field of electric staplers, and discloses an electric stapler with multi-level overload protection, including a driving handle and a connecting part, wherein the driving handle is connected to the execution end of the stapler through the connecting part, a firing rod is arranged inside the connecting part, and a firing gear rod is connected to the proximal end of the firing rod; a driving assembly and an overload protection mechanism are arranged inside the driving handle. The rated load of the clamping firing overload state during clamping is adjusted to be smaller than the rated load of the anastomosis firing overload state during cutting and anastomosis through the overload adjustment component, thereby ensuring that the forces required for clamping and cutting and anastomosis are different, that is, the rated load required for cutting and anastomosis is generally smaller than the rated load required for clamping, thereby ensuring that the stapler can clamp and cut and anastomose the affected part normally when using the same device, thereby avoiding the use of the rated load for cutting and anastomosis during clamping, and encountering hypertrophy of the affected part tissue, so that the affected part tissue is squeezed and necrotized under the excessive rated load.

Description

Technical Field

[0001] The present invention relates to the technical field of electric staplers, in particular to an electric stapler with multi-stage overload protection. Background Art

[0002] Laparoscopic anastomosis is one of the most common operations in abdominal surgery and is also the most basic surgical operation that general surgeons must master. Surgeons have been using surgical instruments to suture tissues for nearly 200 years. As one of the most successful surgical instruments, staplers have been widely used in modern surgery. All manual sutures in gastrointestinal surgery can be performed with staplers. Gastrointestinal staplers are considered to be the most important development in the field of surgical instruments in the second half of the 20th century. More and more surgeons are willing to use staplers when performing esophageal intestinal anastomosis, anal preservation for low rectal cancer, and laparoscopic surgery.

[0003] When using a stapler for surgery, since the stapler actuator is usually located inside the patient's body, medical staff cannot know the specific situation of the stapler actuator. Therefore, an overload protection device is often set inside the stapler to prevent the stapler from being overloaded due to failure to fire normally. The device can automatically stop driving. When overload protection is used, the following problems may occur under this function:

[0004] Existing overload protection devices generally achieve overload protection by disconnecting the driving and firing devices. During the working process of the stapler, the driving force required is different. For example, the affected tissue is clamped at the stapler anastomosis part, compared with the further cutting and anastomosis. Since the cutting and anastomosis are performed at the same time, the driving force required is generally greater than the driving force required for clamping. The existing overload protection device sets a safe rated load value, and then during clamping or cutting and anastomosis, when the resistance encountered by the driving force is greater than the rated load value, the overload protection will be triggered. However, the driving force required for clamping and cutting and anastomosis is different, that is, the resistance encountered by the drive to achieve clamping and cutting and anastomosis is different. When clamping, the rated load value used for cutting and anastomosis is used, which will cause the patient's tissue to be excessively clamped and cause necrosis. The rated load value used for cutting and anastomosis will cause some tissues that can be cut and anastomosed normally to be unable to undergo normal surgery due to the set rated load value being too small.

[0005] Currently, no effective solution has been proposed for the problems in the related technologies. Summary of the invention

[0006] 1. Technical issues to be solved

[0007] In view of the deficiencies in the prior art, the present invention provides an electric stapler with multi-level overload protection to solve the above-mentioned problems.

[0008] (II) Technical solution

[0009] In order to solve the above-mentioned technical problems, the present invention provides the following technical solutions: an electric stapler with multi-stage overload protection, comprising a driving handle and a connecting part, wherein the driving handle is connected to the execution end of the stapler through the connecting part, a firing rod is arranged inside the connecting part, and a firing gear rod is connected to the proximal end of the firing rod; a driving assembly and an overload protection mechanism are arranged inside the driving handle, and the driving assembly is used to drive the firing gear rod to move; the overload protection mechanism comprises an overload clutch assembly and an overload adjustment assembly; the overload clutch assembly is used to separate the driving assembly from the firing gear rod, and the overload adjustment assembly is used to adjust the use state of the overload clutch assembly; in the process of clamping and anastomosing the anastomosis position at the executing end, the overload clutch assembly has two use states: a clamping firing overload state and an anastomosing firing overload state, and the rated load of the clamping firing overload state is less than the rated load of the anastomosing firing overload state.

[0010] Preferably, the driving assembly includes a driving gear, a transmission gear and a driving motor. The transmission gears are respectively located on both sides of the firing gear rod. There are two driving gears in total. The two driving gears are meshed at the bottom of the firing gear rod. One side of each driving gear is respectively meshed with the transmission gear. A supporting plate is provided at the bottom of the driving gear. The supporting plate is connected to the inside of the driving handle. The bottom of the driving gear is rotatably connected to the supporting plate through a rotating shaft. A rotating shaft at the bottom of the driving gear passes through the supporting plate and is connected to the output shaft of the driving motor.

[0011] Preferably, a mounting plate is provided at the bottom of the transmission gear, the transmission gear is rotatably connected to the mounting plate, a guide block is provided on one side of the bottom of the mounting plate, the overload clutch assembly is located between the guide blocks on both sides, a slide groove is opened above the bearing plate, and the guide block is located inside the slide groove.

[0012] Preferably, the overload clutch assembly includes a mounting shaft, a mounting block, an overload tension spring and a movable cylinder, the mounting block is mounted on the bearing plate through the mounting shaft, the movable cylinder is mounted on the inner side of the guide block, the overload tension spring is sleeved on the outside of the movable cylinder, and the overload tension spring is located between the guide block and the mounting block.

[0013] Preferably, the mounting shaft passes through and extends to the bottom of the supporting plate, and the mounting shaft and the supporting plate are slidably matched. A locking spring is arranged between the bottom of the mounting shaft and the supporting plate. Under the action of the locking spring, the mounting block is always subjected to a force in the direction of the supporting plate.

[0014] Preferably, the overload adjustment assembly includes an adjusting rod, an adjusting button, a movable plate and a limit plate, the adjusting rod passes through the mounting block, the movable cylinder and the guide block, a bearing is provided in the middle of the adjusting rod and is connected to the middle of the mounting block, two ends of the adjusting rod respectively pass through two sides of the driving handle and extend to the outside of the driving handle, the adjusting buttons are respectively located at two ends of the adjusting rod, the movable plates are respectively located at two sides of the mounting block, and the movable plates are threadedly connected to the adjusting rod, the limit plates are located at two ends of the mounting block, the movable plates are located between the limit plates, and two ends of the overload tension spring are respectively connected to the guide block and the movable plate.

[0015] Preferably, the overload protection mechanism also includes a releasing locking member, which is located at the bottom of the guide block, and the supporting plate is provided with locking grooves at both ends of the slide groove, and the locking grooves respectively penetrate the driving handle. The releasing locking member is located inside the locking groove, and the upper surface of the releasing locking member extends above the supporting plate; an adjustment accommodating groove is provided above the locking groove, and the adjusting rod is located inside the adjustment accommodating groove.

[0016] Preferably, the unlocking member includes a releasing button, a telescopic cylinder, a wedge block and a mounting guide block, the releasing button is located in the middle part of the outer side of the driving handle, the releasing button is connected to one side of the telescopic cylinder, the wedge block is located on the other side of the telescopic cylinder, a telescopic spring is provided in the middle part of the telescopic cylinder, one end of the mounting guide block is located inside the telescopic cylinder, two ends of the telescopic spring are respectively connected to the inner wall of the telescopic cylinder and the mounting guide block, and the other end of the mounting guide block is connected to the bearing plate.

[0017] Preferably, a return block is provided above the driving handle, and the return block is connected to the top of the firing gear rod.

[0018] (III) Beneficial effects

[0019] Compared with the prior art, the present invention provides an electric stapler with multi-level overload protection, which has the following beneficial effects:

[0020] 1. The electric stapler with multi-stage overload protection adjusts the overload clutch component state of the stapler to a clamping and firing overload state through an overload adjustment component in an overload protection mechanism, and then extends the execution end into the patient's body through a connecting portion, and enables the anastomotic portion at the distal end of the execution end to clamp a portion that needs to be anastomosed and cut. Then, when the stapler in the clamping and firing overload state is clamping the anastomotic and cut portion, if the patient's affected tissue is too thick during the process of clamping the anastomotic and cut portion, the overload clutch component in the clamping and firing overload state can prevent the anastomotic portion at the distal end of the execution end from being unable to clamp the affected tissue due to the excessive thickness of the affected tissue.

[0021] 2. The electric stapler with multi-level overload protection adjusts the stapler to an anastomosis firing overload state. During the anastomosis cutting process at the anastomosis cutting part, if the patient's affected tissue is too tough, or the connection part and the internal transmission of the execution end are stuck, the stapler drive will be overloaded. Under the action of the overload clutch assembly in the anastomosis firing overload state, the drive assembly will move away from the firing gear rod, thereby causing the firing gear rod to lose driving force, thereby preventing the anastomosis part at the distal end of the execution end from being unable to cut and anastomose the affected tissue due to excessive toughness of the affected tissue or jamming of the connection part and the internal transmission of the execution end.

[0022] 3. The electric stapler with multi-level overload protection adjusts the rated load of the clamping firing overload state during clamping to be smaller than the rated load of the anastomosis firing overload state during cutting and anastomosis through the overload adjustment component, thereby ensuring that the forces required for clamping and cutting and anastomosis are different, that is, the rated load required for cutting and anastomosis is generally smaller than the rated load required for clamping, thereby ensuring that the stapler can normally clamp and cut and anastomose the affected area when using the same device, and avoiding the situation where the rated load for cutting and anastomosis is used during clamping and the affected area tissue is thickened, causing the affected area tissue to be squeezed and necrotized under an excessively large rated load.

[0023] 4. The electric stapler with multi-stage overload protection rotates the adjusting rod by turning the adjusting knob in the overload adjustment assembly, so that the middle part of the adjusting rod rotates in the middle part of the mounting block through the bearing. When the adjusting rod rotates, the movable plate threadedly connected thereto is driven to move, and the adjusting rod drives the movable plate away from the mounting block. At this time, the tension of the overload tension spring between the movable plate and the guide block becomes smaller, that is, the force received by the transmission gear in the direction of the firing gear rod is reduced, and the transmission gear is more likely to move away from the firing gear rod, which is in the clamping firing overload state; the movable plate threadedly connected thereto is driven to move, and the adjusting rod drives the movable plate close to the mounting block. At this time, the tension of the overload tension spring between the movable plate and the guide block becomes larger, that is, the force received by the transmission gear in the direction of the firing gear rod is larger, and the transmission gear is more difficult to move away from the firing gear rod, which is in the stapler firing overload state. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the driving handle of the present invention;

[0025] Figure 2 It is a schematic diagram of the internal cross-sectional structure of the driving handle of the present invention;

[0026] Figure 3 It is a schematic diagram of a partial cross-sectional structure of a driving assembly of the present invention;

[0027] Figure 4 It is a schematic diagram of the structure of the driving component of the present invention;

[0028] Figure 5It is a schematic diagram of the exploded structure of the driving assembly of the present invention;

[0029] Figure 6 This is one of the structural schematic diagrams of the drive assembly, overload clutch assembly and overload adjustment assembly of the present invention;

[0030] Figure 7 This is the second structural schematic diagram of the driving assembly, overload clutch assembly and overload regulating assembly of the present invention;

[0031] Figure 8 It is a partial cross-sectional structural schematic diagram of the overload adjustment assembly and the unlocking locking member of the present invention.

[0032] In the figure: 1. driving handle; 11. bearing plate; 12. slide groove; 13. locking groove; 14. adjustment accommodating groove; 2. connecting part; 21. firing rod; 22. firing gear rod; 3. execution end; 4. driving assembly; 41. driving gear; 42. transmission gear; 421. mounting plate; 422. guide block; 43. driving motor; 5. overload clutch assembly; 51. mounting shaft; 511. locking spring; 52. mounting block; 53. overload tension spring; 54. movable cylinder; 6. overload adjustment assembly; 61. adjustment rod; 62. adjustment button; 63. movable plate; 64. limit plate; 7. unlocking member; 71. release button; 72. telescopic cylinder; 73. wedge block; 74. mounting guide block; 75. telescopic spring; 8. return dial block. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1-8, an electric stapler with multi-level overload protection, comprising a driving handle 1 and a connecting part 2, wherein the driving handle 1 is connected to the execution end 3 of the stapler through the connecting part 2, a firing rod 21 is arranged inside the connecting part 2, and a firing gear rod 22 is connected to the proximal end of the firing rod 21; a driving assembly 4 and an overload protection mechanism are arranged inside the driving handle 1, and the driving assembly 4 is used to drive the firing gear rod 22 to move; the overload protection mechanism comprises an overload clutch assembly 5 and an overload adjustment assembly 6; the overload clutch assembly 5 is used to separate the driving assembly 4 from the firing gear rod 22, and the overload adjustment assembly 6 is used to adjust the use state of the overload clutch assembly 5; in the process of clamping and anastomosing the anastomotic position at the execution end 3, the overload clutch assembly 5 has two use states: a clamping firing overload state and an anastomosing firing overload state, and the rated load of the clamping firing overload state is less than the rated load of the anastomosing firing overload state.

[0035] Before the execution end 3 is inserted into the patient's body, the state of the overload clutch assembly 5 of the stapler is adjusted to the clamping firing overload state through the overload adjustment assembly 6 in the overload protection mechanism, and then the execution end 3 is inserted into the patient's body through the connecting portion 2, and the anastomotic portion (a component of the stapler itself) at the distal end of the execution end 3 is clamped on the part that needs to be anastomosed and cut, and then the stapler in the clamping firing overload state, in the process of clamping the anastomotic cutting part, encounters that the tissue of the patient's affected part is too thick, under the action of the overload clutch assembly 5 in the clamping firing overload state, the driving assembly 4 is away from the firing gear rod 22, so that the firing gear rod 22 loses driving force, that is, the firing rod 21 loses power, to avoid the affected part The tissue is too thick, so that the anastomotic part at the distal end of the execution end 3 cannot clamp the affected tissue; then the stapler is adjusted to the anastomotic firing overload state. During the anastomotic cutting process of the anastomotic cutting part, if the patient's affected tissue is too tough, or the connection part 2 and the internal transmission of the execution end 3 are stuck, the stapler drive is overloaded. Under the action of the overload clutch component 5 in the anastomotic firing overload state, the drive component 4 is away from the firing gear rod 22, so that the firing gear rod 22 loses the driving force, thereby avoiding the anastomotic part at the distal end of the execution end 3 from being unable to cut and anastomose the affected tissue due to the excessive toughness of the affected tissue or the connection part 2 and the internal transmission of the execution end 3 being stuck.

[0036] The overload adjustment component 6 is used to adjust the rated load of the clamping firing overload state during clamping to be smaller than the rated load of the anastomosis firing overload state during cutting and anastomosis, thereby realizing multi-level adjustment during clamping and cutting and anastomosis, ensuring that the forces required for clamping and cutting and anastomosis are different, that is, the rated load required for cutting and anastomosis is generally smaller than the rated load required for clamping, ensuring that the stapler can clamp and cut and anastomose the affected area normally when using the same device, and avoiding the use of the rated load for cutting and anastomosis during clamping, and encountering hypertrophy of the affected tissue, causing squeezing necrosis of the affected tissue under an excessively large rated load.

[0037] Furthermore, the driving assembly 4 includes a driving gear 41, a transmission gear 42 and a driving motor 43. The transmission gears 42 are respectively located on both sides of the firing gear rod 22. There are two driving gears 41. The two driving gears 41 are meshed and arranged at the bottom of the firing gear rod 22. One side of each driving gear 41 is respectively meshed with the transmission gear 42. A supporting plate 11 is provided at the bottom of the driving gear 41. The supporting plate 11 is internally connected to the driving handle 1. The bottom of the driving gear 41 is rotatably connected to the supporting plate 11 through a rotating shaft. A rotating shaft at the bottom of the driving gear 41 passes through the supporting plate 11 and is connected to the output shaft of the driving motor 43. The driving motor 43 in the driving assembly 4 drives the driving gear 41 to rotate, and the driving gear 41 drives the transmission gear 42 meshed with it to rotate, and then the transmission gear 42 drives the firing gear rod 22 meshed with it to move toward the distal end.

[0038] Furthermore, a mounting plate 421 is provided at the bottom of the transmission gear 42, and the transmission gear 42 is rotatably connected to the mounting plate 421. A guide block 422 is provided on one side of the bottom of the mounting plate 421. The overload clutch assembly 5 is located between the guide blocks 422 on both sides. A slide groove 12 is provided above the supporting plate 11, and the guide block 422 is located inside the slide groove 12. By providing the mounting plate 421 at the bottom of the transmission gear 42, the transmission gear 42 is supported by the mounting plate 421. At the same time, the guide block 422 provided on one side of the bottom of the mounting plate 421 cooperates with the slide groove 12 provided above the supporting plate 11, so that the transmission gear 42 can be displaced along the direction of the slide groove 12, that is, it can be displaced relative to the firing gear rod 22, so that the driving assembly 4 can be separated from the firing gear rod 22.

[0039] Furthermore, the overload clutch assembly 5 includes a mounting shaft 51, a mounting block 52, an overload tension spring 53 and a movable cylinder 54. The mounting block 52 is mounted on the bearing plate 11 through the mounting shaft 51, the movable cylinder 54 is mounted on the inner side of the guide block 422, the overload tension spring 53 is sleeved on the outer side of the movable cylinder 54, and the overload tension spring 53 is located between the guide block 422 and the mounting block 52; the overload clutch assembly 5 is mounted on the bearing plate 11 through the mounting shaft 51, and the overload tension spring 53 on both sides of the mounting block 52 above the mounting shaft 51 is used to move the overload clutch assembly 5 3. Pull the guide blocks 422 on both sides toward the mounting block 52. Under the action of the overload spring 53, the guide blocks 422 are always subjected to a force in the direction of the firing gear rod 22, that is, the transmission gear 42 is always subjected to a force in the direction of the firing gear rod 22. When the firing gear rod 22 is subjected to excessive resistance during its movement, the transmission gear 42 and the firing gear rod 22 are pushed by the teeth, so that the transmission gear 42 is pushed away from the firing gear rod 22, and then the mounting block 52 at the bottom of the transmission gear 42 further stretches the overload spring 53, so that the overload spring 53 extends along the movable cylinder 54.

[0040] Furthermore, the mounting shaft 51 passes through and extends to the bottom of the supporting plate 11, and the mounting shaft 51 is slidably matched with the supporting plate 11. A locking spring 511 is arranged between the bottom of the mounting shaft 51 and the supporting plate 11. Under the action of the locking spring 511, the mounting block 52 is always subjected to a force in the direction of the supporting plate 11. Through the locking spring 511 arranged at the bottom of the mounting shaft 51, the mounting block 52 is always close to the upper surface of the slide groove 12 when moving inside the slide groove 12.

[0041] Furthermore, the overload adjustment component 6 includes an adjustment rod 61, an adjustment button 62, a movable plate 63 and a limit plate 64. The adjustment rod 61 passes through the mounting block 52, the movable cylinder 54 and the guide block 422. A bearing is provided in the middle of the adjustment rod 61 and is connected to the middle of the mounting block 52. The two ends of the adjustment rod 61 respectively pass through the two sides of the driving handle 1 and extend to the outside of the driving handle 1. The adjustment button 62 is respectively located at the two ends of the adjustment rod 61. The movable plate 63 is respectively located at the two sides of the mounting block 52, and the movable plate 63 is threadedly connected to the adjustment rod 61. The limit plate 64 is located at the two ends of the mounting block 52. The movable plate 63 is located between the limit plates 64. The two ends of the overload tension spring 53 are respectively connected to the guide block 422 and the movable plate 63. Through the overload adjustment component The adjusting knob 62 in 6 rotates the adjusting rod 61 to rotate, so that the middle part of the adjusting rod 61 rotates in the middle part of the mounting block 52 through the bearing. When the adjusting rod 61 rotates, the movable plate 63 threadedly connected thereto is driven to move. When it is necessary to adjust to the clamping firing overload state, the adjusting rod 61 drives the movable plate 63 away from the mounting block 52. At this time, the tension of the overload tension spring 53 between the movable plate 63 and the guide block 422 becomes smaller, that is, the force received by the transmission gear 42 in the direction of the firing gear rod 22 is reduced, and the transmission gear 42 is easier to move away from the firing gear rod 22; when it is necessary to adjust to the matching firing overload state, the adjusting rod 61 drives the movable plate 63 close to the mounting block 52. At this time, the tension of the overload tension spring 53 between the movable plate 63 and the guide block 422 becomes larger, that is, the force received by the transmission gear 42 in the direction of the firing gear rod 22 becomes larger, and it is more difficult for the transmission gear 42 to move away from the firing gear rod 22.

[0042] Furthermore, the overload protection mechanism also includes a release lock member 7, the release lock member 7 is located at the bottom of the guide block 422, the carrier plate 11 is located at both ends of the slide slot 12 and respectively has locking slots 13, the locking slots 13 are respectively arranged through the driving handle 1, the release lock member 7 is located inside the locking slot 13, and the upper surface of the release lock member 7 extends above the carrier plate 11; an adjustment accommodating slot 14 is opened above the locking slot 13, and the adjusting rod 61 is located inside the adjustment accommodating slot 14; through the locking slots 13 set at both ends of the slide slot 12, when the transmission gear 42 is away from the firing gear rod 22 due to excessive resistance during the firing process of the stapler, the bottom of the transmission gear 42 The guide block 422 moves to both sides along the slide groove 12 and moves into the locking groove 13. At this time, under the action of the locking spring 511 at the bottom of the mounting shaft 51, the entire overload clutch assembly 5 and the transmission gear 42 will drop. After the guide block 422 at the bottom of the transmission gear 42 falls into the locking groove 13, the guide block 422 will not restore the meshing of the transmission gear 42 and the firing gear rod 22 due to the tension of the overload tension spring 53, that is, the transmission gear 42 is always separated from the firing gear rod 22 when the guide block 422 is unlocked, so as to avoid the disappearance of the thrust between the firing gear rod 22 and the transmission gear 42 after the firing gear rod 22 is separated from the transmission gear 42, so that the transmission gear 42 automatically meshes with the firing gear rod 22 again.

[0043] After the guide block 422 at the bottom of the transmission gear 42 is locked in the locking groove 13, when the guide block 422 needs to be unlocked, the unlocking member 7 arranged on one side of the guide block 422 is pressed, so that the unlocking member 7 pushes the guide block 422 out of the locking groove 13 and allows it to enter the slide groove 12 again. Under the action of the overload tension spring 53, the guide block 422 moves along the slide groove 12 toward the mounting block 52 until the transmission gear 42 is engaged with the firing gear rod 22.

[0044] Furthermore, the unlocking member 7 includes a release button 71, a telescopic cylinder 72, a wedge block 73 and a mounting guide block 74, wherein the release button 71 is located in the middle of the outer side of the driving handle 1, the release button 71 is connected to one side of the telescopic cylinder 72, the wedge block 73 is located on the other side of the telescopic cylinder 72, a telescopic spring 75 is provided in the middle of the telescopic cylinder 72, one end of the mounting guide block 74 is located inside the telescopic cylinder 72, the two ends of the telescopic spring 75 are respectively connected to the inner wall of the telescopic cylinder 72 and the mounting guide block 74, and the other end of the mounting guide block 74 is provided. The end is connected to the carrying plate 11; by pressing the release button 71 in the unlocking member 7, the release button 71 drives the telescopic cylinder 72 to move toward the installation guide block 74. During the movement, the bottom of the inclined surface of the wedge block 73 at the front end of the telescopic cylinder 72 first extends to the bottom of the guide block 422 that falls into the locking groove 13. As the telescopic cylinder 72 continues to move, the wedge block 73 pushes the guide block 422 to move upward, so that the guide block 422 moves up into the slide groove 12, and then under the action of the overload tension spring 53, the guide block 422 moves along the slide groove 12 toward the installation block 52.

[0045] Furthermore, a return block 8 is provided above the driving handle 1, and the return block 8 is connected to the top of the firing gear rod 22; through the return block 8 provided above the driving handle 1, after the overload protection, the firing gear rod 22 is driven to move backward by manually moving the return block 8.

[0046] Working principle: before the execution end 3 is inserted into the patient's body, the overload adjustment component 6 in the overload protection mechanism is used to adjust the state of the overload clutch component 5 of the stapler to the clamping and firing overload state, and then the execution end 3 is inserted into the patient's body through the connecting part 2, and the anastomotic part (a component of the stapler itself) at the distal end of the execution end 3 is clamped to the part that needs to be anastomosed and cut;

[0047] In the process of adjusting the clamping firing overload state, the adjusting rod 61 is rotated by rotating the adjusting knob 62 in the overload adjusting assembly 6, so that the middle part of the adjusting rod 61 rotates in the middle part of the mounting block 52 through the bearing. When the adjusting rod 61 rotates, the moving plate 63 threadedly connected thereto is driven to move, and the adjusting rod 61 drives the moving plate 63 away from the mounting block 52. At this time, the tension of the overload tension spring 53 between the moving plate 63 and the guide block 422 becomes smaller, that is, the force on the transmission gear 42 in the direction of the firing gear rod 22 is reduced, and the transmission gear 42 is more likely to be away from the firing gear rod 22;

[0048] When the stapler in the clamping firing overload state is clamping the anastomotic cutting part, if the patient's affected tissue is too thick, the driving component 4 is moved away from the firing gear rod 22 under the action of the overload clutch component 5 in the clamping firing overload state, so that the firing gear rod 22 loses the driving force, that is, the firing rod 21 loses the power, so as to avoid the anastomotic part at the distal end of the execution end 3 being unable to clamp the affected tissue due to the excessively thick affected tissue;

[0049] After the stapler in the clamping firing overload state clamps the patient's affected tissue normally, the stapler is adjusted to the anastomosis firing overload state to cut and anastomose the clamped patient's affected tissue; wherein the adjusting rod 61 is rotated by the adjusting button 62 in the overload adjusting assembly 6, so that the middle part of the adjusting rod 61 rotates in the middle part of the mounting block 52 through the bearing, and when the adjusting rod 61 rotates, the moving plate 63 threadedly connected thereto is driven to move, and the adjusting rod 61 drives the moving plate 63 to approach the mounting block 52, at which time the tension of the overload tension spring 53 between the moving plate 63 and the guide block 422 becomes larger, that is, the force applied to the transmission gear 42 in the direction of the firing gear rod 22 becomes larger, and it is more difficult for the transmission gear 42 to move away from the firing gear rod 22;

[0050] During the process of anastomosis cutting at the anastomosis cutting part, if the toughness of the affected tissue of the patient is too large, or the connection part 2 and the internal transmission of the execution end 3 are stuck, the stapler drive is overloaded. Under the action of the overload clutch component 5 in the anastomosis firing overload state, the driving component 4 is away from the firing gear rod 22, so that the firing gear rod 22 loses the driving force, so as to avoid the anastomosis part at the distal end of the execution end 3 being unable to cut and anastomose the affected tissue due to the excessive toughness of the affected tissue or the connection part 2 and the internal transmission of the execution end 3 being stuck;

[0051] The rated load of the clamping firing overload state during clamping is adjusted to be smaller than the rated load of the anastomosis firing overload state during cutting and anastomosis by the overload adjustment component 6, thereby ensuring that the forces required for clamping and cutting and anastomosis are different, that is, the rated load required for cutting and anastomosis is generally smaller than the rated load required for clamping, thereby ensuring that the stapler can normally clamp and cut and anastomose the affected part when using the same device, thereby avoiding the situation where the rated load for cutting and anastomosis is used during clamping and the affected part tissue is thickened, causing the affected part tissue to be squeezed and necrotized under an excessive rated load;

[0052] When an overload occurs, the overload clutch assembly 5 is installed on the carrier plate 11 through the installation shaft 51, and the overload tension springs 53 on both sides of the installation block 52 above the installation shaft 51 are used to pull the guide blocks 422 on both sides toward the installation block 52. Under the action of the overload tension spring 53, the guide block 422 is always subjected to a force in the direction of the firing gear rod 22, that is, the transmission gear 42 is always subjected to a force in the direction of the firing gear rod 22. When the firing gear rod 22 is moving and encounters excessive resistance, the transmission gear 42 and the firing gear rod 22 are pushed by the teeth, so that the transmission gear 42 is pushed away from the firing gear rod 22, and then the installation block 52 at the bottom of the transmission gear 42 further stretches the overload tension spring 53, so that the overload tension spring 53 extends along the movable cylinder 54.

[0053] After overload occurs, through the locking grooves 13 set at both ends of the slide groove 12, when the transmission gear 42 is away from the firing gear rod 22 due to excessive resistance during the firing process of the stapler, the guide block 422 at the bottom of the transmission gear 42 moves to both sides along the slide groove 12 and moves into the locking groove 13. At this time, under the action of the locking spring 511 at the bottom of the mounting shaft 51, the entire overload clutch assembly 5 and the transmission gear 42 will descend. After the guide block 422 at the bottom of the transmission gear 42 falls into the locking groove 13, the guide block 422 will not restore the meshing of the transmission gear 42 and the firing gear rod 22 due to the tension of the overload tension spring 53, that is, the transmission gear 42 is always separated from the firing gear rod 22 when the guide block 422 is unlocked, so as to avoid the disappearance of the thrust between the firing gear rod 22 and the transmission gear 42 after the firing gear rod 22 is separated from the transmission gear 42, so that the transmission gear 42 automatically meshes with the firing gear rod 22 again.

[0054] When the overload lock needs to be released, the release lock member 7 arranged on one side of the guide block 422 is pressed, so that the release lock member 7 pushes the guide block 422 out of the locking groove 13 and allows it to enter the slide groove 12 again. Under the action of the overload tension spring 53, the guide block 422 moves along the slide groove 12 toward the mounting block 52 until the transmission gear 42 engages with the firing gear rod 22.

[0055] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electric stapler with multi-stage overload protection, comprising a driving handle (1) and a connecting portion (2), wherein the driving handle (1) is connected to an actuating end (3) of the stapler via the connecting portion (2), a firing rod (21) is arranged inside the connecting portion (2), and characterized in that: The proximal end of the firing rod (21) is connected to a firing gear rod (22); A driving assembly (4) and an overload protection mechanism are arranged inside the driving handle (1), and the driving assembly (4) is used to drive the firing gear rod (22) to move; The overload protection mechanism comprises an overload clutch component (5) and an overload adjustment component (6); The overload clutch assembly (5) is used to separate the drive assembly (4) from the firing gear rod (22), and the overload adjustment assembly (6) is used to adjust the use state of the overload clutch assembly (5); During the process of the execution end (3) clamping and anastomosing the anastomotic position, the overload clutch assembly (5) has two use states: a clamping firing overload state and an anastomosing firing overload state, and the rated load of the clamping firing overload state is smaller than the rated load of the anastomosing firing overload state; The driving assembly (4) comprises a driving gear (41), wherein there are two driving gears (41), the two driving gears (41) are meshed and arranged at the bottom of the firing gear rod (22), and a bearing plate (11) is arranged at the bottom of the driving gear (41). The overload clutch assembly (5) comprises a mounting shaft (51), a mounting block (52), an overload tension spring (53) and a movable cylinder (54); the mounting block (52) is mounted on the bearing plate (11) via the mounting shaft (51); the movable cylinder (54) is mounted on the inner side of the guide block (422); the overload tension spring (53) is sleeved on the outer side of the movable cylinder (54); and the overload tension spring (53) is located between the guide block (422) and the mounting block (52).

2. The electric stapler with multi-stage overload protection according to claim 1, characterized in that: The driving assembly (4) comprises a transmission gear (42) and a driving motor (43), wherein the transmission gears (42) are respectively located on both sides of the firing gear rod (22), and one side of each driving gear (41) is respectively meshed with the transmission gear (42), the supporting plate (11) is internally connected to the driving handle (1), and the bottom of the driving gear (41) is rotatably connected to the supporting plate (11) via a rotating shaft, and a rotating shaft at the bottom of the driving gear (41) passes through the supporting plate (11) and is connected to the output shaft of the driving motor (43).

3. The electric stapler with multi-stage overload protection according to claim 2, characterized in that: A mounting plate (421) is arranged at the bottom of the transmission gear (42), the transmission gear (42) is rotatably connected to the mounting plate (421), a guide block (422) is arranged at one side of the bottom of the mounting plate (421), the overload clutch assembly (5) is located between the guide blocks (422) on both sides, a slide groove (12) is opened above the bearing plate (11), and the guide block (422) is located inside the slide groove (12).

4. The electric stapler with multi-stage overload protection according to claim 1, characterized in that: The installation shaft (51) passes through and extends to the bottom of the bearing plate (11), and the installation shaft (51) and the bearing plate (11) are slidably matched. A locking spring (511) is provided between the bottom of the installation shaft (51) and the bearing plate (11). Under the action of the locking spring (511), the installation block (52) is always subjected to a force in the direction of the bearing plate (11).

5. The electric stapler with multi-stage overload protection according to claim 1, characterized in that: The overload adjustment component (6) comprises an adjustment rod (61), an adjustment button (62), a movable plate (63) and a limit plate (64); the adjustment rod (61) passes through the mounting block (52), the movable cylinder (54) and the guide block (422); a bearing is arranged in the middle of the adjustment rod (61) and is connected to the middle of the mounting block (52); two ends of the adjustment rod (61) respectively pass through two sides of the driving handle (1) and extend outside the driving handle (1); the adjustment button (62) is respectively located at two ends of the adjustment rod (61); the movable plate (63) is respectively located at two sides of the mounting block (52), and the movable plate (63) is threadedly connected to the adjustment rod (61); the limit plate (64) is located at two ends of the mounting block (52); the movable plate (63) is located between the limit plates (64); and two ends of the overload tension spring (53) are respectively connected to the guide block (422) and the movable plate (63).

6. The electric stapler with multi-stage overload protection according to claim 3, characterized in that: The overload protection mechanism further comprises a unlocking member (7), the unlocking member (7) being located at the bottom of the guide block (422), the carrier plate (11) being provided with locking grooves (13) at both ends of the slide groove (12), the locking grooves (13) respectively penetrating the driving handle (1), the unlocking member (7) being located inside the locking grooves (13), and the upper surface of the unlocking member (7) extending above the carrier plate (11); an adjusting accommodating groove (14) being provided above the locking groove (13), and the adjusting rod (61) being located inside the adjusting accommodating groove (14).

7. The electric stapler with multi-stage overload protection according to claim 6, characterized in that: The unlocking member (7) comprises a release button (71), a telescopic cylinder (72), a wedge block (73) and a mounting guide block (74); the release button (71) is located at the middle part of the outer side of the driving handle (1); the release button (71) is connected to one side of the telescopic cylinder (72); the wedge block (73) is located at the other side of the telescopic cylinder (72); a telescopic spring (75) is arranged at the middle part of the telescopic cylinder (72); one end of the mounting guide block (74) is located inside the telescopic cylinder (72); two ends of the telescopic spring (75) are respectively connected to the inner wall of the telescopic cylinder (72) and the mounting guide block (74); the other end of the mounting guide block (74) is connected to the bearing plate (11).

8. The electric stapler with multi-stage overload protection according to claim 1, characterized in that: A return block (8) is arranged above the driving handle (1), and the return block (8) is connected to the top of the firing gear rod (22).

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