Bending assembly and anastomat

Abstract

The utility model discloses a bending component, the near end of the bending component is connected with a transmission component (1), the far end of the bending component is connected with a nail bin component (2), the bending component is characterized by comprising a bending joint component, a first flexible sheet (110), a second flexible sheet (1110), a connecting rod (106), an auxiliary connecting rod (107) and a steering connecting rod (108); the near end of the steering connecting rod (108) is connected with the far end of the connecting rod (106), the near end of the connecting rod (106) is connected with the far end of the first flexible sheet (110), and the first flexible sheet (110) penetrates through the bending joint assembly and then is connected with the near end of the bending joint assembly; the near end of the auxiliary connecting rod (107) is connected with the far end of the second flexible piece (1110), and the second flexible piece (1110) penetrates through the bending joint assembly and then is connected with the near end of the bending joint assembly. The utility model has the advantages of simple structure, good effect, low cost and easiness in process realization.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a bending assembly used for a surgical instrument stapler. Background Art

[0002] Laparoscopic staplers have seen rapid growth in recent years, occupying a crucial position in minimally invasive surgery. However, due to limitations in technology and materials, the stapler cartridges of early laparoscopic staplers were not designed to bend, limiting their ability to cut and suture along a straight line. With the advancement of materials and technology, laparoscopic staplers with bendable cartridges have been developed, and now occupy a majority of the market share. However, the performance of laparoscopic staplers on the market varies significantly, with the bendable angles of the cartridges varying widely. Excessive bending angles increase the firing force, while too small bending angles reduce their practicality.

[0003] Existing solutions for laparoscopic staplers with flexible cartridges typically use a single-joint bending assembly controlled by a connecting rod. This connecting rod connects the cartridge to the other side, and pushing the connecting rod from one side causes the cartridge to bend. While this single-joint bending assembly is simple, it also results in a large bending curvature, which increases the firing force and affects the firing feel, presenting unavoidable technical drawbacks.

[0004] How to solve the technical problem of larger bending angles in the existing technology is a technical problem that urgently needs to be solved. Utility Model Content

[0005] The technical problem to be solved by the utility model is to solve the technical problem in the prior art that the bending angle is too small and the practicality is not strong.

[0006] In order to solve the above technical problems, the technical solutions provided by the present invention are as follows:

[0007] A bending assembly, wherein the proximal end of the bending assembly is connected to a transmission assembly (1), and the distal end of the bending assembly is connected to a nail magazine assembly (2), characterized in that it includes a bending joint assembly, a first flexible sheet (110), a second flexible sheet (1110), a connecting rod (106), a secondary connecting rod (107), and a steering connecting rod (108);

[0008] The proximal end of the steering connecting rod (108) is connected to the distal end of the connecting rod (106), and the proximal end of the connecting rod (106) is connected to the distal end of the first flexible sheet (110). After the first flexible sheet (110) passes through the bending joint assembly, it is connected to the proximal end of the bending joint assembly; the proximal end of the auxiliary connecting rod (107) is connected to the distal end of the second flexible sheet 1 (110), and after the second flexible sheet (1110) passes through the bending joint assembly, it is connected to the proximal end of the bending joint assembly.

[0009] Furthermore, the bending joint assembly includes a first bending joint (114), a second bending joint (115), a first bending gear set, and a second bending gear set, wherein the first bending gear set connects the first bending joint (114) to the nail magazine inner core (101) and the nail magazine inner core lower cover (102).

[0010] Furthermore, the first bending gear set comprises a first bending gear (112) and a second bending gear (1112), wherein the first bending gear (112) is located on the upper surface of the first bending joint (114), and the second bending gear (1112) is located on the lower surface of the first bending joint (114), and the first bending gear (112) and the second bending gear (1112) connect the first bending joint (114) to the nail magazine inner core (101) and the nail magazine inner core lower cover (102).

[0011] Furthermore, the first mounting hole (1121) of the first bending gear (112) is mounted on the upper first mounting pillar (1141) of the first bending joint (114), and the limiting block (1123) of the first bending gear (112) is mounted in the limiting groove (1015) on the inner core (101) of the nail magazine; the second mounting hole (1121) of the second bending gear (112) is mounted on the lower third mounting pillar (1141) of the first bending joint (114), and the limiting block (1123) of the second bending gear (112) is mounted in the limiting groove (1021) on the lower cover (102) of the inner core of the nail magazine.

[0012] Furthermore, the second bending gear set includes a third bending gear (116) and a fourth bending gear (117), wherein the third bending gear (116) is located on the upper surface of the second bending joint (115), and the tooth profile (1162) of the third bending gear (116) is meshed with the tooth profile (1122) of the first bending gear (112).

[0013] The fourth bending gear (117) is located on the lower surface of the second bending joint (115), and the tooth profile (1172) of the fourth bending gear (117) is meshed with the tooth profile (11122) of the second bending gear (1112).

[0014] Furthermore, the bending assembly also includes a driving gear (103), a driving rack (104), and a secondary rack (105); the driving gear (103) is fixed on a gear mounting seat (1011) on the inner core (101) of the nail magazine; the driving rack (104) is located in a driving gear chute (1012) on the inner core (101) of the nail magazine; the secondary rack (105) is located in a secondary gear chute (1013) on the inner core (101) of the nail magazine; and the driving gear (103) has a tooth profile (1032) which engages with a straight tooth surface (1041) of the driving rack (104) and a straight tooth surface (1051) of the secondary rack (105), respectively.

[0015] Furthermore, a first flexible sheet track (1143) and a second flexible sheet track (1148) are respectively provided on both sides of the first bending joint (114); the first flexible sheet (110) passes through the first flexible sheet track (1143) on one side of the first bending joint (114) and enters the nail magazine core connecting rod track (1014) on one side of the nail magazine core (101), and limits the first positioning rod (1042) on the driving rack (104) in the first positioning groove (1061) of the connecting rod (106); the second flexible sheet (110) passes through the second flexible sheet track (1148) on the other side of the first bending joint (114) and enters the nail magazine core connecting rod track (1014) on the other side of the nail magazine core (101), and limits the second positioning rod (1052) on the auxiliary rack (105) in the second positioning groove (1071) of the auxiliary connecting rod (107).

[0016] Furthermore, it also includes a nail magazine shell (113), which is sleeved on the nail magazine inner core (101) and the nail magazine inner core lower cover (102), and the nail magazine shell (113) is provided with a limiting groove (1131), which cooperates with the limiting protrusion (1016) and the limiting protrusion (1023) on the nail magazine inner core (101) and the nail magazine inner core lower cover (102), so that the nail magazine shell (113) is limited on the nail magazine inner core (101) and the nail magazine inner core lower cover (102), thereby locking the first bending gear (112) and the second bending gear (1112).

[0017] Furthermore, the first bending joint (114) and the second bending joint (115) are respectively provided with a first conical yielding structure (1145) and a second conical yielding structure (1155).

[0018] A stapler comprises any one of the bending components described above.

[0019] After adopting such a design, the utility model has at least the following advantages:

[0020] (1) The double-joint solution reduces the bending curvature of the bending structure, and when in the bending state, reduces the resistance of the cutting knife to move forward and backward.

[0021] (2) The utility model has a simple structure, good effect, low cost and easy process implementation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] Figure 1 This is a schematic structural diagram of a bending assembly according to an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the exploded structure of a bending assembly according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the exploded structure of the staple cartridge assembly 2 according to one embodiment of the present invention;

[0026] Figure 4 This is a structural diagram of the bending device 1 of one embodiment of the present invention when bending to the left at the maximum angle;

[0027] Figure 5 This is a schematic structural diagram of the bending device 1 of an embodiment of the present invention when bending to the right at the maximum angle;

[0028] Figure 6 This is a schematic diagram of the structure of the maximum bending angle of the bending device 1 according to one embodiment of the present invention;

[0029] Figure 7 This is a structural diagram of the inner core 101 of the nail magazine according to an embodiment of the present invention;

[0030] Figure 8 This is a structural diagram of the lower cover 102 of the nail magazine inner core according to an embodiment of the present invention;

[0031] Figure 9 This is a schematic structural diagram of the driving gear 103 according to an embodiment of the present invention;

[0032] Figure 10 This is a schematic structural diagram of a drive rack 104 according to an embodiment of the present invention;

[0033] Figure 11 This is a schematic structural diagram of the auxiliary rack 105 according to an embodiment of the present invention;

[0034] Figure 12 This is a schematic structural diagram of a connecting rod 106 according to an embodiment of the present invention;

[0035] Figure 13 This is a schematic structural diagram of the auxiliary connecting rod 107 according to an embodiment of the present invention;

[0036] Figure 14 This is a structural diagram of a steering connecting rod 108 according to an embodiment of the present invention;

[0037] Figure 15 This is a structural diagram of the first flexible sheet 110 according to an embodiment of the present invention;

[0038] Figure 16 This is a schematic structural diagram of the second flexible sheet 1110 according to an embodiment of the present invention;

[0039] Figure 17 This is a structural diagram of a knurled pin 111 according to an embodiment of the present invention;

[0040] Figure 18 This is a schematic structural diagram of the first bending gear 112 according to an embodiment of the present invention;

[0041] Figure 19 This is a schematic structural diagram of the second bending gear 1112 according to an embodiment of the present invention;

[0042] Figure 20 This is a structural diagram of a nail magazine housing 113 according to an embodiment of the present invention;

[0043] Figure 21 This is a schematic structural diagram of the first bending joint 114 according to an embodiment of the present invention;

[0044] Figure 22 This is a schematic structural diagram of the second bending joint 115 according to an embodiment of the present invention;

[0045] Figure 23 This is a schematic structural diagram of the second bending gear 116 according to an embodiment of the present invention;

[0046] Figure 24 This is a schematic structural diagram of the third bending gear 117 according to an embodiment of the present invention;

[0047] Figure 25 This is a schematic structural diagram of the first pin 118 in one embodiment of the present utility model;

[0048] Figure 26 This is a schematic structural diagram of a cutting knife 119 according to an embodiment of the present invention;

[0049] Figure 27 This is a structural diagram of an anvil 201 according to an embodiment of the present invention;

[0050] Figure 28This is a structural diagram of the inner core 202 of the nail magazine according to an embodiment of the present invention;

[0051] Figure 29 This is a schematic structural diagram of the second pin 203 in one embodiment of the present utility model;

[0052] Figure 30 This is a schematic structural diagram of a staple cartridge 204 according to an embodiment of the present invention;

[0053] Reference numerals,

[0054] Transmission assembly 1, nail magazine assembly 2, nail magazine core 101, gear mounting seat 1011, drive gear slide 1012, sub-gear slide 1013, nail magazine core connecting rod track 1014, first limiting groove 1015, limiting protrusion 1016, cutting knife channel 1017, nail magazine core lower cover 102, second limiting groove 1021, limiting protrusion 1023, cutting knife channel 1024, drive gear 103, gear mounting hole 1031, fifth tooth shape 1032, drive rack 104, first straight tooth surface 1041, first positioning rod 1042, sub-rack 105, second straight tooth surface 1051, second positioning rod 105 2. Connecting rod 106, first positioning groove 1061, middle groove 1062, eighth mounting hole 1063, fifth mounting support 1064, auxiliary connecting rod 107, second positioning groove 1071, sixth mounting support 1072, steering connecting rod 108, ninth mounting hole 1081, connecting rod pin 109, first flexible sheet 110, tenth mounting hole 1101, eleventh mounting hole 1102, knurled pin 111, second flexible sheet 1110, thirteenth mounting hole 11101, first bending gear 112, first mounting hole 1121, first tooth shape 1122, first stop block 1123, second bending gear 1112, second mounting hole Mounting hole 11121, second tooth shape 11122, second limiting block 11123, nail magazine housing 113, limiting groove 1131, first bending joint 114, first mounting support 1141, third mounting support 1142, first flexible sheet track 1143, first bending joint cutting knife channel 1144, a conical giving structure 1145, second mounting support 1146, fourth mounting support 1147, second flexible sheet track 1148, second bending joint 115, twelfth mounting hole 1151, fifth mounting hole 1152, seventh mounting hole 1153, second bending joint cutting knife channel 1154; second conical giving structure Structure 1155, eighth mounting hole 1156, third bending gear 116, third mounting hole 1161, third tooth profile 1162, first pin slot 1163, fourth mounting hole 1164, rivet holder 1165, fourth bending gear 117, sixth mounting hole 1171, fourth tooth profile 1172, second pin slot 1173, seventh mounting hole 1174, first pin 118, pin cap 1181, rivet holder 1182, cutting blade 119, anvil 201, fifteenth mounting hole 2011, sixteenth mounting hole 2012, nail magazine 202, fourteenth mounting hole 2021, second pin 203, nail magazine 204; DETAILED DESCRIPTION

[0055] The following will be combined with the accompanying 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0056] In this document, “upper”, “lower”, etc. are only used to indicate the relative position relationship between related parts, rather than to limit the absolute positions of these related parts.

[0057] The end of each component closer to the operator is defined as the proximal end, and the end farther from the operator is defined as the distal end. The expressions proximal end and distal end are only used to simplify and clarify the description and should not be construed as any limitation to the present invention.

[0058] like Figure 1-30 As shown, an embodiment of the present invention provides a bending assembly, wherein the proximal end of the bending assembly is connected to the transmission assembly 1, and the distal end of the bending assembly is connected to the nail magazine assembly 2. The bending assembly includes a bending joint assembly, a first flexible sheet 110, a second flexible sheet 1110, a connecting rod 106, a secondary connecting rod 107, and a steering connecting rod 108. The proximal end of the steering connecting rod 108 is connected to the distal end of the connecting rod 106, and the proximal end of the connecting rod 106 is connected to the distal end of the first flexible sheet 110. After the first flexible sheet 110 passes through the bending joint assembly, it is connected to the proximal end of the bending joint assembly; the proximal end of the secondary connecting rod 107 is connected to the distal end of the second flexible sheet 1110. After the second flexible sheet 1110 passes through the bending joint assembly, it is connected to the proximal end of the bending joint assembly.

[0059] Here, there is no steering link on the secondary link 107 side; the secondary link relies on gear meshing to provide force. The distal end of the secondary link 107 is connected to the second flexible sheet 1110 via the sixth mounting post 1072. The first and second flexible sheets 1110 are locked to the twelfth mounting holes 1151 on either side of the second bending joint 115 via knurled pins 111.

[0060] The bending joint assembly includes a first bending joint 114, a second bending joint 115, a first bending gear set, and a second bending gear set. The first bending gear set and the second bending gear set connect the first bending joint 114 to the nail magazine inner core 101 and the nail magazine inner core lower cover 102. The first bending gear group includes a first bending gear 112 and a second bending gear 1112. The first bending gear 112 is located on the upper surface of the first bending joint 114, and the second bending gear 1112 is located on the lower surface of the first bending joint 114. The first bending gear 112 and the second bending gear 1112 connect the first bending joint 114 to the nail magazine inner core 101 and the nail magazine inner core lower cover 102; specifically, the first mounting hole 1121 of the first bending gear 112 is mounted on the first mounting pillar 1141 on the first bending joint 114, and the first limiting block 1123 of the first bending gear 112 is mounted in the first limiting groove 1015 on the nail magazine inner core 101; the second mounting hole 11121 of the second bending gear 1112 is mounted on the second mounting pillar 1146 under the first bending joint 114, and the second limiting block 11123 of the second bending gear 1112 is mounted in the second limiting groove 1021 on the nail magazine inner core lower cover 102.

[0061] The second bending gear group includes a third bending gear 116 and a fourth bending gear 117. The third bending gear 116 is located on the upper surface of the second bending joint 115. The third tooth shape 1162 of the third bending gear 116 is engaged with the first tooth shape 1122 on the first bending gear 112. The fourth bending gear 117 is located on the lower surface of the second bending joint 115. The fourth tooth shape 1172 of the fourth bending gear 117 is engaged with the second tooth shape 11122 on the second bending gear 1112.

[0062] The third mounting hole 1161 of the third bending gear 116 is mounted on the third mounting post 1142 at the upper end of the first bending joint 114. The third bending gear 116 is then placed on the upper end of the second bending joint 115. The fourth mounting hole 1164 of the third bending gear 116 aligns with the fifth mounting hole 1152 on the second bending joint 115, and the third tooth profile 1162 of the third bending gear 116 engages with the first tooth profile 1122 on the upper end of the first bending gear 112. The third and fourth bending gears 116 and 117 are locked to the second bending joint 115. The third and fourth bending gears 116 and 117 have third and sixth mounting holes 1161 and 1171, respectively, and are mounted on the third and fourth mounting posts 1142 and 1147, symmetrically located above and below the first bending joint 114.

[0063] Similarly, the sixth mounting hole 1171 of the fourth bending gear 117 is installed on the fourth mounting pillar 1147 at the lower end of the first bending joint 114, and the fourth bending gear 117 is placed at the lower end of the second bending joint 115. At this time, the seventh mounting hole 1174 of the fourth bending gear 117 is aligned with the eighth mounting hole 1156 on the second bending joint 115, and the fifth tooth shape 1172 of the fourth bending gear 117 is engaged with the second tooth shape 11122 on the second bending gear 1112.

[0064] The third bending gear 116 is provided with two fourth mounting holes 1164, the second bending joint 115 is also provided with two corresponding fifth mounting holes 1152, and the fourth bending gear 117 is provided with two corresponding seventh mounting holes 1174. The two first pins 118 are respectively inserted into the two fourth mounting holes 1164 of the third bending gear 116, and the first pins 118 pass through the third bending gear 116, the second bending joint 115 and the fourth bending gear 117 in sequence. The pin cap 1181 of the first pin 118 is located in the first pin slot 1163 of the third bending gear 116, and the rivet seat 1182 of the first pin 118 passes through the seventh mounting hole 1174 of the fourth bending gear 117 and is located in the second pin slot 1173 of the fourth bending gear 117. The rivet seat 1182 of the first pin 118 is flattened by a riveting machine to lock the first bending joint 114, the second bending joint 115, the third bending gear 116 and the fourth bending gear 117 together. In the present utility model, when the third bending gear 116 and the fourth bending gear 117 are installed on the second bending joint 115, the first bending joint 114 needs to be locked in the third mounting hole 1161 and the sixth mounting hole 1171 at the same time.

[0065] When the third bending gear 116 is engaged with the first bending gear 112, the second bending joint assembly performs planetary gear motion around the center of the first tooth profile 1122 of the first bending gear 112, i.e., the center of the first mounting hole 1121; at the same time, one end of the first bending joint 114 is connected to the first mounting hole 1121 of the first bending gear 112, and the other end of the first bending joint 114 is connected to the second bending gear assembly. When the second bending gear assembly rotates, it drives the first bending joint 114 to rotate around the center of the first tooth profile 1122 of the first bending gear 112, i.e., the center of the first mounting hole 1121, and the first bending joint 114 and the second bending joint 115 are linked.

[0066] This solution further reduces the bending curvature of the bending structure, and reduces the resistance to the forward and backward movement of the cutting knife 119 when the stapler assembly is in the bent state, that is, the smaller the bending curvature, the smaller the resistance.

[0067] Furthermore, the bending assembly also includes a driving gear 103, a driving rack 104, and a secondary rack 105. The nail magazine core 101 is provided with a gear mounting seat 1011, and the driving gear 103 is fixed to the gear mounting seat 1011 through a gear mounting hole 1031. The driving rack 104 and the secondary rack 105 are respectively placed on the driving gear chute 1012 and the secondary gear chute 1013 on the nail magazine core 101, and the driving rack 104 and the secondary rack 105 are axially movable in the chute. The driving gear 103 has a fifth tooth profile 1032, which meshes with the first spur tooth surface 1041 and the second spur tooth surface 1051 on the driving rack 104 and the secondary rack 105, respectively.

[0068] Furthermore, the connecting rod 106 is provided with a middle groove 1062, the proximal end of the steering connecting rod 108 is inserted into the middle groove 1062 of the connecting rod 106, the distal end of the connecting rod 106 is provided with an eighth mounting hole 1063, the proximal end of the steering connecting rod 108 is provided with a ninth mounting hole 1081, and the connecting rod pin 109 connects the eighth mounting hole 1063 and the ninth mounting hole 1081, thereby locking the connecting rod 106 and the steering connecting rod 108.

[0069] A fifth mounting post 1064 is provided at the proximal end of the connecting rod 106, and a tenth mounting hole 1101 is provided at the distal end of the first flexible sheet 110. The fifth mounting post 1064 is inserted into the tenth mounting hole 1101 to secure the first flexible sheet 110 and the connecting rod 106. An eleventh mounting hole 1102 is provided at the proximal end of the first flexible sheet 110, and a twelfth mounting hole 1151 is provided at the corresponding second bending joint 115. The knurled pin 111 passes through the eleventh mounting hole 1102 and the twelfth mounting hole 1151, thereby connecting the connecting rod 106, the steering connecting rod 108, the first flexible sheet 110, and the second bending joint 115 together.

[0070] There are first flexible sheet tracks 1143 and second flexible sheet tracks 1148 on both sides of the first bending joint 114 respectively. The first flexible sheet 110 passes through the first flexible sheet track 1143 on one side of the first bending joint 114 and enters the nail magazine core connecting rod track 1014 on the side of the nail magazine core 101, restricting the first positioning rod 1042 on the driving rack 104 in the first positioning groove 1061 of the connecting rod 106.

[0071] Similarly, a sixth mounting post 1072 is provided at the proximal end of the secondary connecting rod 107 and is inserted into the thirteenth mounting hole 11101 at the distal end of the second flexible sheet 1110. The knurled pin 111 passes through the thirteenth mounting hole 11101 at the distal end of the second flexible sheet 1110 and is inserted into the twelfth mounting hole 1151 on the other side of the second bending joint 115, thereby connecting the secondary connecting rod 107, the second flexible sheet 1110 and the second bending joint 115 together.

[0072] The second flexible sheet 1110 passes through the second flexible sheet track 1148 on the other side of the first bending joint 114 and enters the nail magazine core connecting rod track 1014 on the other side of the nail magazine core 101; and restricts the second positioning rod 1052 on the auxiliary rack 105 in the second positioning groove 1071 of the auxiliary connecting rod 107.

[0073] The lower cover 102 of the nail magazine core is installed on the nail magazine core 101, so that the first flexible sheet 110 and the second flexible sheet 1110 can move axially in the nail magazine core connecting rod tracks 1014 on both sides of the nail magazine core 101 respectively. Due to the limitation of the nail magazine core connecting rod tracks 1014, the first flexible sheet 110 and the second flexible sheet 1110 can move axially in the nail magazine core connecting rod tracks 1014 on both sides of the nail magazine core 101 respectively, and the structure of the first flexible sheet 110 and the second flexible sheet 1110 exposed outside the nail magazine core connecting rod tracks 1014 of the nail magazine core 101 will deform and bend with the bending of the joint.

[0074] The working process of the bending assembly of one embodiment of the utility model is as follows:

[0075] When the steering connecting rod 108 moves toward the proximal direction, it drives the connecting rod 106 and the first flexible sheet 110 to move toward the proximal direction, thereby driving the second bending joint 115 to bend. At the same time, since the driving gear 103 is engaged with the auxiliary rack 105, the auxiliary rack 105 moves in the opposite direction of the driving rack 104 at the same time, causing the auxiliary connecting rod 107 and the second flexible sheet 1110 to move toward the distal direction, thereby pushing the second bending joint 115 to move toward the distal direction, causing the nail magazine assembly 2 to bend in one direction, and the maximum bending angle is 60°.

[0076] When the steering connecting rod 108 moves toward the distal direction, it drives the connecting rod 106 and the first flexible sheet 110 to move toward the distal direction, thereby driving the second bending joint 115 to bend. At the same time, since the driving gear 103 is engaged with the auxiliary rack 105, the auxiliary rack 105 moves in the opposite direction of the driving rack 104 at the same time, causing the auxiliary connecting rod 107 and the second flexible sheet 1110 to move toward the proximal direction, thereby pushing the second bending joint 115 to move toward the proximal direction, causing the nail magazine assembly 2 to bend in the other direction, and the maximum bending angle is 60°.

[0077] The bending assembly of one embodiment of the present invention also includes a nail magazine shell 113, which is sleeved on the nail magazine inner core 101 and the nail magazine inner core lower cover 102. The nail magazine shell 113 has a limiting groove 1131, which cooperates with the limiting protrusions 1016 and the limiting protrusions 1023 on the nail magazine inner core 101 and the nail magazine inner core lower cover 102, so that the nail magazine shell 113 is restricted on the nail magazine inner core 101 and the nail magazine inner core lower cover 102, and the first bending gear 112 and the second bending gear 1112 at the upper and lower positions are locked.

[0078] Here, there are cutting knife channels 1017 and 1024 on the nail magazine inner core 101 and the nail magazine inner core lower cover 102, and the cutting knife 119 moves axially inside them.

[0079] The staple cartridge assembly 2 comprises an anvil 201, a staple magazine 202, a second pin 203, and a staple cartridge 204. The anvil 201 has a fifteenth mounting hole 2011. The fifteenth mounting hole 2011 of the anvil 201 is mounted on the rivet base 1165 of the second bending gear 116. The anvil 201 is secured to the second bending gear 116, and the rivet base 1165 of the second bending gear 116 is flattened using a riveting machine.

[0080] The nail magazine 204 is installed in the nail box 202, and the nail box 202 is provided with a fourteenth mounting hole 2021. The fourteenth mounting hole 2021 of the nail magazine 202 is aligned with the sixteenth mounting hole 2012 on the nail support 201 and the seventh mounting hole 1153 of the second bending joint 115. The two second pins 203 are inserted on the left and right sides in an interference state, so that the nail magazine assembly 2 is locked on the bending assembly.

[0081] The first bending joint 114 and the second bending joint 115 respectively have a first conical yielding structure 1145 and a second conical yielding structure 1155. When at the maximum bending angle, the first bending joint cutting knife channel 1144 and the second bending joint cutting knife channel 1154 do not affect the movement of the cutting knife 119, and further reduce the resistance to the movement of the cutting knife 119.

[0082] The utility model also discloses a stapler comprising the bending assembly of any of the above solutions.

[0083] During surgery, after the stapler is inserted into the abdominal cavity, the stapler cartridge often needs to bend at a certain angle to reach the tissue where the cutting and suturing are required. The greater the bending angle of the stapler cartridge, the greater the advantages of the laparoscopic stapler during surgery. Therefore, the development of a laparoscopic stapler with better performance is urgent. The stapler assembly introduced in this utility model has at least the following advantages:

[0084] (1) The double-joint solution reduces the bending curvature of the bending structure, and when in the bending state, reduces the resistance of the cutting knife to move forward and backward.

[0085] (2) The utility model has a simple structure, good effect, low cost and easy process implementation.

[0086] Those skilled in the art will readily conceive of other embodiments of the present invention after considering the utility model disclosed in the specification and examples. This application is intended to cover any variations, uses, or adaptations of the present invention that adhere to the general principles of the present invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered merely as exemplary; the true scope and spirit of the present invention are indicated by the following claims.

[0087] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A bending assembly, wherein the proximal end of the bending assembly is connected to a transmission assembly (1), and the distal end of the bending assembly is connected to a staple cartridge assembly (2), characterized in that: It comprises a bending joint assembly, a first flexible sheet (110), a second flexible sheet (1110), a connecting rod (106), a secondary connecting rod (107), and a steering connecting rod (108); The proximal end of the steering connecting rod (108) is connected to the distal end of the connecting rod (106), and the proximal end of the connecting rod (106) is connected to the distal end of the first flexible sheet (110). After the first flexible sheet (110) passes through the bending joint assembly, it is connected to the proximal end of the bending joint assembly; the proximal end of the auxiliary connecting rod (107) is connected to the distal end of the second flexible sheet (1110). After the second flexible sheet (1110) passes through the bending joint assembly, it is connected to the proximal end of the bending joint assembly.

2. The bending assembly according to claim 1, characterized in that The bending joint assembly comprises a first bending joint (114), a second bending joint (115), a first bending gear set, and a second bending gear set. The first bending gear set connects the first bending joint (114) to the nail magazine inner core (101) and the nail magazine inner core lower cover (102).

3. The bending assembly according to claim 2, characterized in that: The first bending gear set comprises a first bending gear (112) and a second bending gear (1112), wherein the first bending gear (112) is located on the upper surface of the first bending joint (114), and the second bending gear (1112) is located on the lower surface of the first bending joint (114), and the first bending gear (112) and the second bending gear (1112) connect the first bending joint (114) to the nail magazine inner core (101) and the nail magazine inner core lower cover (102).

4. The bending assembly according to claim 3, characterized in that: The first mounting hole (1121) of the first bending gear (112) is mounted on the upper first mounting pillar (1141) of the first bending joint (114), and the limiting block (1123) of the first bending gear (112) is mounted in the first limiting groove (1015) on the inner core (101) of the nail magazine; the second mounting hole (11121) of the second bending gear (1112) is mounted on the lower third mounting pillar (1142) of the first bending joint (114), and the limiting block (1123) of the second bending gear (1112) is mounted in the second limiting groove (1021) on the lower cover (102) of the inner core of the nail magazine.

5. The bending assembly according to claim 4, characterized in that: The second bending gear set comprises a third bending gear (116) and a fourth bending gear (117), wherein the third bending gear (116) is located on the upper surface of the second bending joint (115), and the third tooth profile (1162) of the third bending gear (116) is meshed with the first tooth profile (1122) of the first bending gear (112). The fourth bending gear (117) is located on the lower surface of the second bending joint (115), and the fourth tooth profile (1172) of the fourth bending gear (117) is meshed with the second tooth profile (11122) of the second bending gear (1112).

6. The bending assembly according to claim 5, characterized in that: The bending assembly further comprises a driving gear (103), a driving rack (104), and a secondary rack (105), wherein the driving gear (103) is fixed on a gear mounting seat (1011) on the inner core (101) of the nail magazine, the driving rack (104) is located in a driving gear chute (1012) on the inner core (101) of the nail magazine, and the secondary rack (105) is located in a secondary gear chute (1013) on the inner core (101) of the nail magazine, and the driving gear (103) has a fifth tooth shape (1032), which is respectively engaged with a first straight tooth surface (1041) of the driving rack (104) and a second straight tooth surface (1051) of the secondary rack (105).

7. The bending assembly according to claim 6, characterized in that: There are a first flexible sheet track (1143) and a second flexible sheet track (1148) on both sides of the first bending joint (114), respectively. The first flexible sheet (110) passes through the first flexible sheet track (1143) on one side of the first bending joint (114) and enters the nail magazine core connecting rod track (1014) on one side of the nail magazine core (101), thereby limiting the first positioning rod (1042) on the driving rack (104) in the first positioning groove (1061) of the connecting rod (106); the second flexible sheet (1110) passes through the second flexible sheet track (1148) on the other side of the first bending joint (114) and enters the nail magazine core connecting rod track (1014) on the other side of the nail magazine core (101), thereby limiting the second positioning rod (1052) on the auxiliary rack (105) in the second positioning groove (1071) of the auxiliary connecting rod (107).

8. The bending assembly according to claim 7, characterized in that: The invention also includes a nail magazine shell (113), wherein the nail magazine shell (113) is sleeved on the nail magazine inner core (101) and the nail magazine inner core lower cover (102), and the nail magazine shell (113) is provided with a limiting groove (1131), which cooperates with the first limiting protrusion (1016) and the second limiting protrusion (1023) on the nail magazine inner core (101) and the nail magazine inner core lower cover (102), so that the nail magazine shell (113) is limited on the nail magazine inner core (101) and the nail magazine inner core lower cover (102), thereby locking the first bending gear (112) and the second bending gear (1112).

9. The bending assembly according to claim 4, characterized in that: The first bending joint (114) and the second bending joint (115) are respectively provided with a first conical yielding structure (1145) and a second conical yielding structure (1155).

10. A stapler, characterized in that: It comprises a bending assembly as described in any one of claims 1-9.

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