Bipolar forceps core and electrosurgical instrument applying same

Abstract

The bipolar pincer core comprises a first pincer piece, a second pincer piece, a pincer base, an isolation core, an insulation head sleeve and a main pin. The first forceps piece comprises a first forceps tail and a first forceps shoulder, and the second forceps piece comprises a second forceps tail and a second forceps shoulder; the clamp seat comprises a first fork arm and a second fork arm; the isolation core comprises an isolation plate and an isolation shaft; the isolation core is installed between the first clamp shoulder and the second clamp shoulder, the isolation shaft is inserted into a hole of the first clamp shoulder, and the first clamp shoulder and the second clamp shoulder are separated through the isolation plate. The clamp seat is installed outside the first clamp shoulder and the second clamp shoulder, and the insulating head sleeve is installed between the first fork arm and the first clamp shoulder to separate the first fork arm and the first clamp shoulder. Therefore, double poles are formed.

Description

TECHNICAL FIELD

[0001] The present application relates to surgical instruments, in particular to a minimally invasive surgical instrument. BACKGROUND

[0002] During surgery, precise cutting and coagulation is a major challenge for surgeons. Monopolar electrosurgical instruments have high cutting and coagulation efficiency, but their heat release is not accurate enough, which can easily cause secondary damage to the tissue. Bipolar electrosurgical instruments are more accurate than monopolar ones, and the secondary damage is much smaller than monopolar. The pressure resistance of laparoscopic bipolar forceps is low, and the working voltage is usually <800V, which leads to low cutting efficiency. In addition, so far, the structure of laparoscopic bipolar electrosurgical instruments is complex, it is not easy to be cleaned when reused, and breakdown failure is easy to occur, while disposable laparoscopic bipolar electrosurgical instruments are high in cost. SUMMARY

[0003] Therefore, in order to solve the problems of the prior art, various solutions are proposed.

[0004] In one aspect of the present application, a bipolar forceps core is provided, which comprises a first forceps blade, a second forceps blade, a forceps seat, an isolation core, an insulating head cover and a main pin. The first forceps blade comprises a first forceps head, a first forceps tail and a first forceps shoulder connecting them, the first forceps shoulder comprises a first forceps shoulder hole penetrating through it; the second forceps blade comprises a second forceps head, a second forceps tail and a second forceps shoulder connecting them, the second forceps shoulder comprises a second forceps shoulder hole penetrating through it. The forceps seat comprises a forceps seat ring body and transversely extending first and second fork arms, defining a U-shaped fork cavity, the first fork arm comprises a first arm hole, and the second fork arm comprises a second arm hole. The isolation core comprises an isolation plate and a transversely extending isolation shaft, and an isolation hole penetrates through the isolation shaft and the isolation plate. The insulating head cover comprises an insulating sheet and a head cover through hole penetrating through it. The isolation core is installed between the first forceps shoulder and the second forceps shoulder, wherein the isolation shaft is inserted into the first forceps shoulder hole, and the isolation plate separates the first forceps shoulder and the second forceps shoulder. The forceps seat is installed outside the first forceps shoulder and the second forceps shoulder, wherein the first fork arm is close to the first forceps shoulder, the second fork arm is close to the second forceps shoulder, and the insulating head cover is installed between the first fork arm and the first forceps shoulder, separating them. The main pin passes through the first arm hole, the head cover through hole, the isolation hole, the second forceps shoulder hole and the second arm hole in sequence, and the two ends of the main pin are respectively riveted or welded with the first fork arm and the second fork arm.

[0005] In one aspect of the present application, a bipolar forceps core is provided, which comprises a first forceps blade, a second forceps blade, a forceps seat, an isolation core, an insulating head cover and a main pin. The first forceps blade comprises a first forceps head, a first forceps tail and a first forceps shoulder connecting them, the first forceps shoulder comprises a first forceps shoulder hole penetrating through it; the second forceps blade comprises a second forceps head, a second forceps tail and a second forceps shoulder connecting them, the second forceps shoulder comprises a second forceps shoulder hole penetrating through it. The forceps seat comprises a forceps seat ring body and transversely extending first and second fork arms, defining a U-shaped fork cavity, the first fork arm comprises a first arm hole, and the second fork arm comprises a second arm hole. The isolation core comprises an isolation plate and a transversely extending isolation shaft, and an isolation hole penetrates through the isolation shaft and the isolation plate. The insulating head cover comprises an insulating sheet and a head cover through hole penetrating through it. The isolation core is installed between the first forceps shoulder and the second forceps shoulder, wherein the isolation shaft is inserted into the first forceps shoulder hole, and the isolation plate separates the first forceps shoulder and the second forceps shoulder. The forceps seat is installed outside the first forceps shoulder and the second forceps shoulder, wherein the first fork arm is close to the first forceps shoulder, the second fork arm is close to the second forceps shoulder, and the insulating head cover is installed between the first fork arm and the first forceps shoulder, separating them. The main pin passes through the first arm hole, the head cover through hole, the isolation hole, the second forceps shoulder hole and the second arm hole in sequence, and the two ends of the main pin are respectively riveted or welded with the first fork arm and the second fork arm.

[0006] In another aspect, the bipolar inner core further comprises a kingpin sleeve, the kingpin sleeve is in contact with the spacer core through the second jaw shoulder hole. The kingpin is riveted or welded with the first fork arm through the first arm hole at one end and riveted or welded with the second fork arm through the second arm hole at the other end. The first fork arm and the second fork arm are squeezed inwardly to form a firm interference fit between the kingpin sleeve and the spacer core and the insulating head sleeve.

[0007] In another aspect, the thickness of the first jaw shoulder is B1, the thickness of the second jaw shoulder is B2, and the minimum distance between the first jaw shoulder and the second jaw shoulder is B0≤1.0mm.

[0008] In another aspect, the thickness of the first jaw tail is C1, the thickness of the second jaw tail is C2, the thickness of the first jaw shoulder is B1, the thickness of the second jaw shoulder is B2, and the minimum distance between the first jaw shoulder and the second jaw shoulder is B0, wherein C1

[0009] In another aspect, the insulating head sleeve comprises a head sleeve flange arranged along the edge of the insulating sheet, and the head sleeve flange is shaped and sized to ensure that the minimum creepage distance D1 between the first fork arm and the first jaw shoulder is ≥1.0mm during the process of the first jaw sheet and the second jaw sheet from closing to opening to the maximum angle.

[0010] In another aspect, the kingpin is in interference fit with the spacer hole; the kingpin is riveted or welded with the first fork arm and the second fork arm, and the spacer shaft is in interference fit with the insulating sheet, or the spacer shaft is glued and fixed with the insulating sheet.

[0011] In another aspect, any of the foregoing inner cores further comprises a driving assembly; the driving assembly comprises a first driving block, a second driving block and a third driving block, the first driving block and the second driving block are made of metal, the third driving block is made of plastic material, the third driving block is arranged between the first and second driving blocks and connects the two into one and insulates and separates each other. The driving assembly is installed between the first and second clamping tails, wherein the first driving block and the first clamping tail form a first driving pair that can slide with each other, and the second driving block and the second clamping tail form a second driving pair that can slide with each other. Moving the driving assembly forces the first driving pair and the second driving pair to slide simultaneously, thereby forcing the first clamp and the second clamp to rotate and open and rotate and close.

[0012] In another aspect, the first driving block comprises a first driving block head and a first driving block tail, the first driving block head is provided with a first driving shaft, and the first driving block tail is provided with a first connecting slot; the second driving block comprises a second driving block head and a second driving block tail, the second driving block head is provided with a second driving shaft, and the second driving block tail is provided with a second connecting slot; the third driving block comprises a third driving block head and a third driving block tail, and the third driving block tail is provided with a first connecting block and a second connecting block extending laterally to two sides respectively. The first driving block and the second driving block are respectively installed on two sides of the third driving block, the third driving block head separates the first driving block head and the second driving block head, the third driving block tail separates the first driving block tail and the second driving block tail, the first connecting block matches the first connecting slot, and the second connecting block matches the second connecting slot. The first forceps tail proximal end comprises a first transmission slot, and the first driving shaft matches the first transmission slot to form a first driving pair; the second forceps tail proximal end comprises a second transmission slot, and the second driving shaft matches the second transmission slot to form a second driving pair.

[0013] In another aspect, the first driving block comprises a first driving block head and a first driving block tail, the first driving block head is provided with a first driving slot, and the first driving block tail is provided with a first connecting slot; the second driving block comprises a second driving block head and a second driving block tail, the second driving block head is provided with a second driving slot, and the second driving block tail is provided with a second connecting slot; the third driving block comprises a third driving block head and a third driving block tail, and the third driving block tail is provided with a first connecting block and a second connecting block extending laterally to two sides respectively. The first driving block and the second driving block are respectively installed on two sides of the third driving block, the third driving block head separates the first driving block head and the second driving block head, the third driving block tail separates the first driving block tail and the second driving block tail, the first connecting block matches the first connecting slot, and the second connecting block matches the second connecting slot. The first forceps tail proximal end comprises a first transmission slot, and the first driving shaft matches the first transmission slot to form a first driving pair; the second forceps tail proximal end comprises a second transmission slot, and the second driving shaft matches the second transmission slot to form a second driving pair.

[0014] In another aspect, the outer edge of the third driving block comprises a driving block flange extending to two sides respectively, and the driving block flange covers the outer edges of the first driving block and the second driving block, so that the creepage distance A1 between the first driving block and the second driving block is greater than or equal to 1.0 mm.

[0015] In another aspect, the bipolar inner core comprises two insulating forceps sleeve, and the insulating forceps sleeve comprises a forceps head insulating sleeve and a forceps shoulder insulating sleeve. The first insulating forceps sleeve wraps the outer surface of the first forceps, and the proximal end of the forceps shoulder insulating sleeve of the first insulating forceps sleeve extends below the first insulating sheet; the second insulating forceps sleeve wraps the outer surface of the second forceps, and the proximal end of the forceps shoulder insulating sleeve of the second insulating forceps sleeve extends below the second insulating sheet. When the first forceps and the second forceps are from closed to open to the maximum angle, the first forceps shoulder and the second forceps shoulder have no exposed metal part.

[0016] In yet another aspect, the first jaw includes a first jaw tooth, and the other outer surfaces of the first jaw, except for the jaw tooth and its adjacent area, and the first shoulder hole and the first transmission groove, include a complete continuous insulating coating. The second jaw includes a second jaw tooth, and the other outer surfaces of the second jaw, except for the jaw tooth and its adjacent area, and the second shoulder hole and the second transmission groove, include a complete continuous insulating coating.

[0017] In yet another aspect, the bipolar forceps core further includes a metal outer tube and an insulating outer tube, the insulating outer tube being wrapped around the outer surface of the metal outer tube, and the metal outer tube being integrated with the base. The bipolar forceps core further includes a metal inner pull rod and an insulating inner tube, the insulating inner tube being wrapped around the outer surface of the metal inner pull rod, and the metal inner pull rod being integrated with the first driving block.

[0018] In yet another aspect of the present application, an electrosurgical instrument is provided, including the aforementioned bipolar forceps core, and further including a handle assembly matched therewith. The handle assembly includes a handle rotating shaft and a first handle and a second handle rotating around the handle rotating shaft; the first handle is connected with the metal outer tube, and the second handle is connected with the inner pull rod; the first and second handles are rotationally driven to move the inner pull rod relative to the outer tube, thereby forcing the driving assembly to move relative to the base, thereby driving the first jaw and the second jaw to rotate to open or close. An electrode plug is provided in the first handle, the electrode plug including a first pole and a second pole; the first pole is in conduction with the metal inner pull rod, and further in conduction with the first driving block, and further in conduction with the first jaw; the second pole is in conduction with the metal outer tube, and further in conduction with the base, and further in conduction with the second jaw. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more fully understand the nature of the present application, a detailed description is provided below with reference to the accompanying drawings, in which: Figure 1 is an exploded schematic view of the bipolar inner core 2; Figure 2 is a side projection schematic view of the base 10; Figure 3 is another side projection schematic view of the base 10; Figure 4 is a three-dimensional schematic view of the insulating head cover 20; Figure 5 is a three-dimensional schematic view of the first jaw 30; Figure 6 is a three-dimensional schematic view of the second jaw 40; Figure 7 is a three-dimensional schematic view of the isolation core 50; Figure 8 is a side projection schematic view of the kingpin 60; Figure 9 is an exploded schematic view of the driving assembly 7; Figure 10 is a side projection view of the drive assembly 7; Figure 11 is Figure 10 is a cross-sectional view of 11-11 of Figure 12 is an assembly view of the first second jaw, the isolation core, the drive assembly and the kingpin 60; Figure 13 is Figure 12 is an assembly view of the reverse perspective of Figure 14 is a perspective view of the head portion of the bipolar jaw core 2 (insulating outer tube hidden); Figure 15 is a side projection view of the bipolar jaw core 2; Figure 16 is Figure 15 is a cross-sectional view of 16-16 of Figure 17 is Figure 16 is a partial enlarged view of 17-17 of Figure 18 is Figure 16 is an enlarged cross-sectional view at 18-18 of Figure 19 is a side projection view of the electrosurgical instrument 1; Figure 20 is a side projection view of the insulating head cover 20a; Figure 21 is a projection view of the insulating head cover 20a from proximal end to distal end; Figure 22 is an assembly view of the first second jaw, the isolation core, the drive assembly and the kingpin assembly 60a; Figure 23 is a perspective view of the head portion of the bipolar jaw core 2a (insulating outer tube hidden); Figure 24 is a side projection view of the bipolar jaw core 2a; Figure 25 is Figure 24 is an enlarged cross-sectional view at 25-25 of Figure 26 is a perspective view of the insulating head cover 20b; Figure 27 is a side projection view of the insulating head cover 20b; Figure 28 is a side projection view of the head portion of the bipolar jaw core 2a; Figure 29 is Figure 28 is an enlarged cross-sectional view at 29-29 of Figure 30 is a perspective view of the insulating jaw cover 80; Figure 31 is a combined view of the insulating sleeve 80 and the first jaw 30; Figure 32 is a partial view of the head of the bipolar jaw 2b in an open state; Figure 33 is a partial view of the head of the bipolar jaw 2b in a closed state; Figure 34 is a perspective view of the first jaw 30c; Figure 35 is a perspective view of the first jaw 30d (second jaw 40d); Figure 36 is an exploded view of the drive assembly 7a; Figure 37 is a side view of the drive assembly 7a; Figure 38 is a cross-sectional view of 38-38 of Figure 37 ; Figure 39 is a perspective view of the head of the bipolar jaw 2d; Figure 40 is a perspective view of the head of the bipolar jaw 2d from a reverse angle of Figure 39 ; Figure 41 is a side view of the bipolar jaw 2d; In all the views, the same reference numbers indicate identical parts or components. DETAILED DESCRIPTION

[0020] Embodiments of the present application are disclosed herein, it being understood that the embodiments disclosed are merely examples of the present application, which can be embodied in various forms. Therefore, the disclosure is not to be interpreted as limiting but merely as a basis for the claims and as a basis for teaching a person skilled in the art how to use the present application. For the sake of convenience, the proximal side is defined as the side closer to the operator, and the distal side is defined as the side further away from the operator.

[0021] Figures 1-16 depicts a bipolar electrosurgical instrument 1 comprising a bipolar jaw 2 and a handle assembly 3.

[0022] Figures 1-15 depicts the structure and composition of a bipolar jaw 2.

[0023] As Figure 1 , the bipolar jaw 2 comprises a jaw seat 10, an insulating head sleeve 20, a first jaw 30, a second jaw 40, an isolating core 50, a main pin 60 and a drive assembly 7.

[0024] Figure 1 ,Figure 2 and Figure 3 The structure and composition of the tongs seat 10 are depicted. The tongs seat 10 comprises a tongs seat ring body 11 and a first prong arm 12 and a second prong arm 13 extending towards the distal end, defining a U-shaped prong cavity 14. The first prong arm 12 comprises a first arm hole 121, and the second prong arm 13 comprises a second arm hole 131. A tongs seat shaft hole 15 penetrates the tongs seat ring body 11 in the axial direction and communicates with the U-shaped prong cavity 14. In one aspect, the tongs seat 10 further comprises a proximal extension tube 18. The proximal extension tube 18 comprises a proximal tube tail 181, a distal tube head 183, and a hollow tube body 182 extending therebetween, the distal tube head 11 is integrated with the tongs seat ring body 11, and the proximal tube tail 181 comprises a tube tail ring groove 184.

[0025] Figure 4 The structure and composition of the insulating head cover 20 are depicted. The insulating head cover 20 comprises an insulating sheet 22 and a head cover flange 29 arranged along the edge thereof, and a head cover through hole 25 penetrating the head cover flange 29 at the distal end thereof.

[0026] Figure 5 The structure and composition of the first tongs sheet 30 are depicted. The first tongs sheet 30 comprises a first tongs head 31, a first tongs tail 33, and a first tongs shoulder 32 connecting the same, the first tongs shoulder 32 comprises a first shoulder hole 321 penetrating the same, and the proximal end of the first tongs tail 33 comprises a first transmission groove 331.

[0027] Figure 6 The structure and composition of the second tongs sheet 40 are depicted. The second tongs sheet 40 comprises a second tongs head 41, a second tongs tail 43, and a second tongs shoulder 42 connecting the same, the second tongs shoulder 42 comprises a second shoulder hole 421 penetrating the same, and the proximal end of the second tongs tail 43 comprises a second transmission groove 431 extending transversely.

[0028] Figure 7 The structure and composition of the isolation core 50 are depicted. The isolation core 50 comprises an isolation plate 51 and an isolation shaft 52 extending transversely, and an isolation hole 53 penetrating the isolation shaft 52 and the isolation plate 51.

[0029] Figure 8 The structure and composition of the kingpin 60 are depicted. The kingpin 60 comprises a first pin rod 61 and a second pin rod 62, and a third pin rod 64 connecting the same. The diameter of the third pin rod 64 is greater than that of the first pin rod 61 and the second pin rod 63.

[0030] Figures 9-11The structure and composition of the driving assembly 7 are depicted. The driving assembly 7 comprises a first driving block 71, a second driving block 73 and a third driving block 75. The first driving block 71 and the second driving block 73 are made of metal conductor, and the third driving block 75 is made of plastic material. The third driving block 75 is arranged between the first and second driving blocks and connects the two blocks into one body and insulates the first and second driving blocks from each other.

[0031] As Figure 10 and Figure 11 In one implementation, the first driving block 71 comprises a first driving block head 711 and a first driving block tail 715. The first driving block head 711 is provided with a first driving shaft 712, and the first driving block tail 715 is provided with a first connecting slot 716. The second driving block 73 comprises a second driving block head 731 and a second driving block tail 735. The second driving block head 731 is provided with a second driving shaft 732, and the second driving block tail 735 is provided with a second connecting slot 736. The third driving block 75 comprises a third driving block head 751 and a third driving block tail 755. The third driving block tail 755 is provided with a first connecting block 756 and a second connecting block 757 which extend laterally to two sides, respectively. The first and second driving blocks 71 and 73 are installed on two sides of the third driving block 75, respectively. The third driving block head 751 separates the first and second driving block heads, and the third driving block tail 755 separates the first and second driving block tails. The first connecting block 756 matches the first connecting slot 716, and the second connecting block 757 matches the second connecting slot 736.

[0032] The first driving block 71, the second driving block 73 and the third driving block 75 can be connected into one body by secondary injection molding, ultrasonic vibration welding or structural adhesive such as epoxy resin. In another implementation, the third driving block 75 further comprises a driving block through hole 759 which penetrates the first and second connecting blocks 756 and 757. The driving assembly 7 further comprises a riveting pin 79 (not shown in the figure) which is riveted into the driving block through hole 759. The riveting pin 79 increases the connection firmness of the first driving block 71, the second driving block 73 and the third driving block 75 and the shear strength of the first and second connecting blocks.

[0033] In another implementation, the minimum distance A0 between the first and second driving blocks is less than or equal to 1.0 mm. The outer edge of the third driving block comprises a driving block flange 753 which extends to two sides, respectively. The driving block flange 753 covers the outer edges of the first and second driving blocks, so that the creepage distance A1 between the first and second driving blocks is greater than or equal to 1.0 mm (not labeled in the figure). It is easy for those skilled in the art to understand that the creepage distance is the shortest path between two conductive parts or between a conductive part and a device protection interface measured along an insulating surface.

[0034] In another aspect, the driving assembly 7 further comprises an extension rod 77. The extension rod 77 comprises a proximal rod tail 771, a distal rod head 773 and an extension rod bar 772 extending therebetween, the rod tail 771 comprises a rod ring groove 774. The first driving block tail 715 comprises a side extension block 719, the rod head 773 is integrated with the side extension block 719.

[0035] Figures 12-18 The assembly relationship of the bipolar plier core 2 is depicted.

[0036] As Figure 12 and Figure 13 The isolation core 50 is installed between the first plier shoulder 32 and the second plier shoulder 42, the isolation shaft 52 is inserted into the first shoulder hole 321, and the isolation plate 51 separates the first plier shoulder 32 and the second plier shoulder 42. The first pin bar 61 of the king pin 60 penetrates the isolation hole 53, and the third pin bar 63 passes through the second shoulder hole 421 and contacts the isolation plate 51.

[0037] Continuing to refer to Figure 12 and Figure 13 The driving assembly 7 is installed between the first plier tail 33 and the second plier tail 43, wherein the first transmission groove 331 and the first driving shaft 712 match to form a first driving pair, and the second transmission groove 431 and the second driving shaft 732 match to form a second driving pair.

[0038] As Figures 14-18 The insulation head sleeve 20 is first installed on the first fork arm 12 and aligned with the head sleeve through hole 25, and then the first plier piece 30, the second plier piece 40, the isolation core 50, the king pin 60 and the driving assembly 7 are assembled together and installed in the U-shaped fork cavity 14 between the first fork arm 12 and the second fork arm 13 of the plier seat 10; wherein the first plier shoulder 32 matches the insulation head sleeve 20, the second plier shoulder 42 matches the second fork arm 13, the first pin bar 61 penetrates the first arm hole 121 and is riveted or welded with the first fork arm 12, and the second pin bar 62 penetrates the second arm hole 131 and is riveted or welded with the second fork arm 13.

[0039] As Figures 15-18 The driving assembly 7 further comprises an inner insulation tube 79 covering the outer surface of the extension rod 77, and the bipolar plier core 2 further comprises an outer insulation tube 19 covering the outer surface of the extension tube 18. As Figure 17As shown, the first transmission groove 331 of the first clamp 30 contacts and conducts with the first drive shaft 712 of the first drive block, and then conducts with the pull rod 77 to form a first circuit; the second clamp 40, the main pin 60, and the second fork arm 13 conduct, and then conduct with the extension tube 18 to form a second circuit. The isolation core 50, the third drive block 55, the insulating head sleeve 20, and the inner insulating tube 79 constitute an insulation system that isolates the aforementioned first and second circuits. Compared with the existing technology of bipolar electrosurgical instruments, this design greatly simplifies the structure of the insulation system, thereby increasing the reliability of the conductive circuit and the reliability of the insulation isolation. While simplifying the insulation system, more space is left for the conductive circuit, thereby increasing the strength of the conductive components, improving the structural strength of the bipolar instrument, and enhancing its grasping, cutting, and pulling functions.

[0040] like Figure 19 The handle assembly 3 includes a first handle 91, a second handle 92, and a handle shaft 93. The handle shaft 93 connects the first handle 91 and the second handle 92 together. The first handle 91 and the second handle 92 are rotatable relative to the handle shaft 93. The tube tail 181 is connected to the first handle 91, and the pull rod tail 771 is connected to the second handle 92. The first handle and the second handle rotate relative to each other to open or close, forcing the pull rod 77 to move relative to the extension tube 18, thereby forcing the drive assembly to move, thereby forcing the first drive pair and the second drive pair to move and rotate, thereby driving the main rotary pair to rotate, realizing the rotation of the first jaw and the second jaw to close or open relative to each other.

[0041] The first handle 91 further includes a first electrode 911 and a second electrode 912. The first electrode 911 is in contact with the pull rod 77 and is electrically connected, while the second electrode 912 is in contact with the extension tube 18 and is electrically connected. When the wires of the electrosurgical device are connected to the first electrode and the second electrode, the aforementioned first circuit and second circuit are connected to the electrosurgical device. When the tissue to be cut or coagulated simultaneously contacts the first clamp head and the second clamp head, the first circuit and the second circuit are connected, and current flows through the tissue between the first clamp head and the second clamp head. Under the action of the current heating effect, the tissue between them achieves electrocutting or electrocoagulation.

[0042] refer to Figure 19 This structural design effectively reduces costs, allowing the bipolar clamp core to be used only once, while the handle assembly is reusable. This ensures the reliability of electrosurgical performance, reduces costs, and is more environmentally friendly.

[0043] like Figure 18 In one embodiment, the thickness of the first clamp shoulder 32 is B1, the thickness of the second clamp shoulder 42 is B2, and the minimum distance between the first and second clamp shoulders (i.e., the thickness of the isolation plate 51) B0 ≤ 1.0 mm. Combined with... Figure 12 ,Figure 13 , Figure 17 , Figure 18 In a specific implementation, the shapes and sizes of the first jaw shoulder 32, the second jaw shoulder 42 and the isolation plate 51 are designed to ensure that the creepage distances B1≥1.0mm (not shown in the figure) between the first jaw shoulder and the second jaw shoulder are maintained when the first jaw and the second jaw are moved from the closed position to the fully open position.

[0044] In combination with Figure 17 , Figure 18 , in another implementation, the thickness of the first jaw tail 33 is C1, the thickness of the second jaw tail 43 is C2, where C1

[0045] In combination with Figure 12 , Figure 14 , the shape and size of the head flange 29 are designed to ensure that the minimum creepage distance D1≥1.0mm (not shown in the figure) between the first prong 12 and the first jaw shoulder 32 (between the first prong 12 and the first jaw tail 33) is maintained when the first jaw and the second jaw are moved from the closed position to the fully open position.

[0046] In combination with Figure 17 , in another implementation, the shapes and sizes of the drive block flanges 753 are designed to ensure that the creepage distances E1≥1.0mm (not shown in the figure) between the first drive block and the second jaw shoulder, between the first drive block and the second jaw tail, between the second drive block and the first jaw shoulder, and between the second drive block and the first jaw tail are maintained when the first jaw and the second jaw are moved from the closed position to the fully open position.

[0047] In combination with Figure 17 , the shapes and sizes of the isolation shaft 52 and the kingpin 60 are designed to ensure the following functions: after the first prong 12 and the second prong 13 are riveted or welded to the first pin 61 and the second pin 62, the first prong and the second prong are pressed inward to form a firm interference fit between the isolation core 50 and the insulating head 20, and between the isolation core 50 and the third pin 63; the first jaw shoulder forms a clearance fit with the insulating head 20 and the isolation plate 51 on both sides; the second jaw shoulder forms a clearance fit with the isolation plate 51 and the second prong 13 on both sides.

[0048] In combination with Figure 8 , Figure 16 , Figure 17 , and Figure 18The skilled in the art can easily understand that the arrangement of the main pin 60 seems to violate the design of assemblability. However, this "counterintuitive" design idea ingeniously changes the assembly order of the main pin, uses the elastic deformation of the first prong and the second prong to fix the pin structure at the "counterintuitive" point, realizes the interference fit of the first prong, the insulating head sleeve, the isolation core, the main pin and the second prong, and at the same time, simply and compactly constructs the first fixed interval between the insulating head sleeve and the isolation core and the second fixed interval between the second prong and the isolation core, which are isolated from each other and do not interfere with each other. The first jaw shoulder is installed in the first fixed interval and fits with a gap, and the second jaw shoulder is installed in the second fixed interval and fits with a gap, which makes the first jaw and the second jaw very smooth and light during the folding or opening process, which is beneficial to the precise control in minimally invasive surgery, and better solves the problem of clumsy tactile feedback in the use of existing bipolar instruments.

[0049] Figures 20-24 Another bipolar forceps core 2a is depicted. The bipolar forceps core 2a comprises a forceps seat 10, an insulating head sleeve 20a, a first jaw 30, a second jaw 40, an isolation core 50, a main pin assembly 60a and a driving assembly 7.

[0050] As Figure 20 and Figure 21 , the insulating head sleeve 20a comprises an insulating sheet 22a and a head sleeve flange 29a arranged along the edge thereof, and the distal end thereof is provided with a head sleeve through hole 25a penetrating therethrough. In this example, the head sleeve flange 29a continues to extend transversely to form a closed insulating housing 28a.

[0051] As Figure 22 and Figure 25 , the main pin assembly 60a comprises a main pin rod 61a and a main pin sleeve 63a. The main pin assembly 60a is similar in function to the main pin 60, but the main pin assembly 60a is beneficial to simplify the assembly.

[0052] As Figure 22 shown, and in combination with Figure 12 and Figure 13 , the assembly method of the bipolar forceps core 2a is similar to that of the bipolar forceps core 2. First, the isolation core 50 is installed between the first jaw shoulder 32 and the second jaw shoulder 42, the isolation shaft 52 is inserted into the first shoulder hole 321, and the isolation plate 51 separates the first jaw shoulder 32 and the second jaw shoulder 42. The main pin sleeve 63a passes through the second shoulder hole 421 and contacts the isolation plate 51. The driving assembly 7 is installed between the first jaw tail 33 and the second jaw tail 43, wherein the first transmission groove 331 matches with the first driving shaft 712 to form a first driving pair, and the second transmission groove 431 matches with the second driving shaft 732 to form a second driving pair.

[0053] As Figure 23 andFigure 24 As shown, in this example, the bipolar inner core 2a comprises two insulating head sleeves 20a, however, it can also only comprise one insulating head sleeve 20a. One of the insulating head sleeves 20a is first installed on the first prong arm 12 and the first arm hole 121 is aligned with the sleeve through hole 25a; the other insulating head sleeve 20a is then installed on the second prong arm 13 and the second arm hole 131 is aligned with the sleeve through hole 25a; and then the aforementioned first jaw 30, second jaw 40, isolation core 50, main pin sleeve 63a and driving assembly 7 are assembled together and installed into the U-shaped prong cavity 14 between the first prong arm 12 and the second prong arm 13 of the jaw seat 10.

[0054] As shown, the main pin rod 61a is riveted or welded at one end to the first prong arm 12 through the first arm hole 121 and at the other end to the second prong arm 13 through the second arm hole 131. Figure 24 Figure 25 As shown, the first prong arm and the second prong arm are pressed inward to form a firm interference fit between the main pin sleeve 63a, the isolation core 50 and the insulating head sleeve 20a. The two sides of the first jaw shoulder form a clearance fit with the insulating head sleeve 20a and the isolation plate 51; and the two sides of the second jaw shoulder form a clearance fit with the insulating head sleeve 20a and the isolation plate 51. Similar to the bipolar inner core 2, this arrangement facilitates smooth and light folding or unfolding of the first jaw and the second jaw, which is conducive to precise control in minimally invasive surgery and better solves the problem of sluggish and clumsy tactile feedback in the use of existing bipolar instruments. Compared with the bipolar inner core 2, the bipolar inner core 2a has basically the same function, but its assembly is more reasonable and is more conducive to preventing deformation of parts and other assembly errors.

[0055]

[0056] Another insulating head sleeve 20b is depicted. The insulating head sleeve 20b comprises a sleeve ring body 21b and a first insulating sheet 22b and a second insulating sheet 23b extending towards the distal end, defining a U-shaped insulating cavity 24b; and a sleeve shaft hole 25b penetrating through the sleeve ring body 21b and communicating with the U-shaped insulating cavity 24b. The distal end of the first insulating sheet 22b comprises a first sleeve hole 221b and a sleeve flange 229b arranged along the edge thereof; and the distal end of the second insulating sheet 23b comprises a second sleeve hole 231b and a sleeve flange 239b arranged along the edge thereof. Figure 26 Figure 27 The two insulating head sleeves 20a in the bipolar inner core 2a are replaced by the insulating head sleeve 20b to form a new bipolar inner core 2b. The assembly relationship of the bipolar inner core 2b is basically the same as that of the bipolar inner core 2a. As shown,

[0057] Figure 28 29 ​​​​In summary, the insulating head cover 20b is first installed into the U-shaped fork cavity 14, wherein the first insulating sheet 22b matches the first fork arm 12 and the second insulating sheet 23b matches the second fork arm 13; then the first jaw sheet 30, the second jaw sheet 40, the isolation core 50, the main pin sleeve 63a and the driving assembly 7 are assembled together and then installed into the U-shaped insulating cavity 24b of the insulating head cover 20, wherein the first jaw shoulder 32 matches the first insulating sheet 22b and the second jaw shoulder 42 matches the second insulating sheet 23b.

[0058] The main pin rod 61a is riveted or welded at one end to the first fork arm 12 through the first arm hole 121 and at the other end to the second fork arm 13 through the second arm hole 131. The first fork arm and the second fork arm press the main pin sleeve 63a and the isolation shaft 52 inward, forming a firm interference fit between the first fork arm 12, the first insulating sheet 22b, the isolation shaft 52, the isolation plate 51, the main pin sleeve 63a, the second insulating sheet 23b and the second fork arm 13. Meanwhile, a clearance fit is formed between the first jaw shoulder 32 and the first insulating sheet 22b, between the first jaw shoulder 32 and the isolation plate 51, between the second jaw shoulder 32 and the isolation plate 51, and between the second jaw shoulder 32 and the second insulating sheet 23b. The bipolar jaw core 2b has similar advantages to the bipolar jaw core 2a.

[0059] The insulating head cover 20, the insulating head cover 20a and the insulating head cover 20b have similar advantages. The insulating head cover 20 and the insulating head cover 20b can be injection molded from plastic materials with good fluidity (such as PC, ABS, PP, PE, etc.). The insulating head cover 20a can be injection molded, vacuum formed or blow molded from plastic materials with good fluidity. In combination with the insulating head cover 20 and the insulating head cover 20a, those skilled in the art should easily understand that the insulating head cover 20 and the insulating head cover 20a can be adaptively modified in shape to be made into insulating head covers meeting the insulating requirements of the present application by heat shrinkage tube, heat shrinkage film or ordinary film heating forming. The various manufacturing methods of the insulating head cover are not described in detail here.

[0060] The isolation core 50 can be machined or injection molded from high-strength plastic materials such as nylon (PA), polyoxymethylene (POM), polyphenylene sulfide (PPS), polysulfone (PSF), polyimide (PI), polyarylate (PAR), polyether ether ketone (PEEK), fluoropolymer (PTFE, PVDF, PCTFE, PFA), etc.

[0061] Figure 30 The structure and composition of an insulating jaw sheet cover 80 are depicted. The insulating jaw sheet cover 80 comprises a jaw head insulating cover 81 and a jaw shoulder insulating cover 82. As shown in Figure 31The insulating jaw sleeve 80 is shaped and sized to match the first jaw 30. In one preferred embodiment, the insulating jaw sleeve 80 is formed by wrapping a heat shrink tube of appropriate size around the outer surface of the first jaw (second jaw) and then heating to set the shape.

[0062] As Figure 32 and Figure 33 The bipolar jaw assembly 2b further comprises two insulating jaw sleeves 80. The first insulating jaw sleeve 80 is wrapped around the outer surface of the first jaw 30, with the proximal end of the insulating sleeve extending below the first insulating tab 22b. The second insulating jaw sleeve 80 is wrapped around the outer surface of the second jaw 40, with the proximal end of the insulating sleeve extending below the second insulating tab 23b. During the process of opening the first jaw and the second jaw from the closed position to the fully open position, there is no exposed metal portion on the first jaw shoulder and the second jaw shoulder. The distal end of the insulating sleeve can extend to the proximal region of the distal end of the first jaw tip 31 (second jaw tip 41) as needed, so as to achieve precise electrosurgical cutting (electrocoagulation) of the bipolar surgical instrument, i.e., in the endoscopic market, the head of the bipolar instrument is partially insulated, and the local region in contact with the tissue is conductive, and the other parts are completely insulated. Those skilled in the art should understand that in the prior art currently disclosed, it is difficult to achieve insulation to the distal end of the bipolar instrument, and the simplified insulation system of the present application, particularly the design of the gap between the first jaw shoulder (second jaw shoulder) and the insulating system, makes it simple and reliable to insulate to the distal end of the instrument.

[0063] Figure 34 The structure and composition of a further first jaw 30c are depicted. The first jaw 30c is substantially identical to the first jaw 30. The first jaw 30c comprises a first jaw tip 31c, a first jaw tail 33 connected to a first jaw shoulder 32, the first jaw shoulder 32 comprising a first shoulder hole 321 extending therethrough, and the proximal end of the first jaw tail 33 comprising a first transmission groove 331. The first jaw tip 31c comprises a jaw tooth 312c. In one implementation, the outer surface of the first jaw 30c, except for the jaw tooth 312c and the proximal region thereof, and the first shoulder hole 321 and the first transmission groove 331, comprises a complete and continuous insulating coating.

[0064] Similarly, the second jaw 40c comprises a second jaw tip 41c, a second jaw tail 43 connected to a second jaw shoulder 42, the second jaw shoulder 42 comprising a second shoulder hole 421 extending therethrough, and the proximal end of the second jaw tail 43 comprising a second transmission groove 431 extending transversely. The proximal end of the first jaw tail 33 comprises a first transmission groove 331. The second jaw tip 41c comprises a jaw tooth 412c. In one implementation, the outer surface of the second jaw 40c, except for the jaw tooth 412c and the proximal region thereof, and the second shoulder hole 421 and the second transmission groove 331, comprises a complete and continuous insulating coating. The structure of the second jaw 40c is not depicted in detail in the relevant schematic diagram, and reference can be made to the structure of the first jaw 30c. Figure 6and Figure 34 understood.

[0065] Replacing the first jaw 30 and the second jaw 40 in the bipolar inner core 2b with the first jaw 30c and the second jaw 40c can constitute a new bipolar inner core 2c (not shown in the figure). It is easy for those skilled in the art to understand that the first jaw 30c and the second jaw 40c only add an insulating coating to the first jaw 30 and the second jaw 40, and their assembly relationship is equivalent, so it is not described again. The bipolar inner core 2c has better full insulation performance than the bipolar inner core 2b, and can more reliably achieve precise cutting (electrocoagulation).

[0066] Figure 35 The structure and composition of still another first jaw 30d are depicted. The first jaw 30d comprises a first jaw head 31, a first jaw tail 33d and a first jaw shoulder 32 connecting them, the first jaw shoulder 32 comprises a first shoulder hole 321 penetrating through it, and the proximal end of the first jaw tail 33d comprises a first transmission shaft 331d.

[0067] Figure 35 The structure and composition of still another second jaw 40d are depicted. The second jaw 40d comprises a second jaw head 41, a second jaw tail 43d and a second jaw shoulder 42 connecting them, the second jaw shoulder 42 comprises a second shoulder hole 421 penetrating through it, and the proximal end of the second jaw tail 43d comprises a second transmission shaft 431d extending transversely.

[0068] Figures 36-38The structure and composition of another drive assembly 7a are depicted. The drive assembly 7a includes a first drive block 71a, a second drive block 73a, and a third drive block 75a. The first drive block 71a and the second drive block 73a are made of metal conductors, and the third drive block 75a is made of plastic material, which is arranged between the first and second drive blocks and connects the two blocks into one body while insulating and isolating them from each other. The first drive block 71a includes a first drive block head 711a and a first drive block tail 715a. The first drive block head 711a is provided with a first drive slot 712a, and the first drive block tail 715a is provided with a first connecting slot 716a. The second drive block 73a includes a second drive block head 731a and a second drive block tail 735a, the second drive block head 731a is provided with a second drive slot 732a, and the second drive block tail 735a is provided with a second connecting slot 736a. The third drive block 75a includes a third drive block head 751a and a third drive block tail 755a, and the third drive block tail 755a is provided with a first connecting block 756a and a second connecting block 757a extending laterally to both sides, respectively. The first drive block 71a and the second drive block 73a are respectively mounted on both sides of the third drive block 75a, the third drive block head 751a separates the first and second drive block heads, the third drive block tail 755a separates the first and second drive block tails, the first connecting block 756a matches the first connecting slot 716a, and the second connecting block 757a matches the second connecting slot 736a. The outer edge of the third drive block includes a drive block flange 753a extending to both sides, respectively. The drive block flange 753a covers the outer edges of the first and second drive blocks, and the creepage distance A1 between the first and second drive blocks is greater than or equal to 1.0 mm. The drive assembly 7a further includes an extended pull rod 77. The pull rod 77 includes a proximal pull rod tail 771, a distal pull rod head 773, and a pull rod shaft 772 extending therebetween, and the pull rod tail 771 includes a pull rod ring slot 774. The first drive block tail 715a includes a side extension block 719a, and the pull rod head 773 is connected to the side extension block 719a in one body.

[0069] The first jaw 30d, the second jaw 40d, and the drive assembly 7a replace the first jaw 30, the second jaw 40, and the drive assembly 7 in the bipolar inner core 2, thereby forming a new bipolar inner core 2d. Figures 39-41 The assembly relationship of the bipolar jaw core 2d is depicted. The first jaw shoulder, the second jaw shoulder, the isolation core, and the main pin are assembled in the same way as the bipolar jaw core 2. As shown in Figure 39 And Figure 40 The isolation core 50 is mounted between the first jaw shoulder 32 and the second jaw shoulder 42, the isolation shaft 52 is inserted into the first shoulder hole 321, and the isolation plate 51 separates the first jaw shoulder 32 and the second jaw shoulder 42. The first pin rod 61 of the main pin 60 penetrates the isolation hole 53, and the third pin rod 63 passes through the second shoulder hole 421 and contacts the isolation plate 51.

[0070] As Figure 39 , Figure 40 and Figure 41 , the drive assembly 7a is installed between the first jaw tail 33d and the second jaw tail 43d, where the first transmission shaft 331d and the first drive slot 712a form a first drive pair, and the second transmission shaft 431d and the second drive slot 732a form a second drive pair. The installation and fixation of the insulating head cover, the kingpin and the jaw seat are the same as the bipolar inner core 2, and will not be repeated here. Please refer to Figures 14-18 and the corresponding paragraphs in the foregoing for understanding. Those skilled in the art should understand that the functions and performances of the bipolar inner core 2d and the bipolar inner core 2 are basically the same, and the main difference is that the technical features of the two components constituting the first and second drive pairs are exchanged with each other.

[0071] Those skilled in the art should understand that certain features of the present application can be combined and recombined with each other. For example, the insulating jaw sheet cover and the insulating coating are added to the bipolar inner core 2 at the same time; for example, the insulating head cover 20 is replaced with the insulating head cover 20b in the bipolar inner core 2c. More changes can also be imagined. The first and second used herein only distinguish features and do not represent the order. In addition, US patents US5489290, US5947996, US6340365, US7931667, US8551077, US8926599 disclose various inner core assemblies and quick connection and disconnection mechanisms between the reusable handles. These mechanisms can be slightly modified and used for the connection between the bipolar inner core and the reusable handle of the present application. So far, many connection methods between the inner core and the handle of the minimally invasive surgical instrument have been disclosed in the field of minimally invasive surgical instruments, and slight modifications can be made to these methods for the connection between the inner core assembly and the handle of the present application. This will not be repeated here.

Claims

1. A bipolar plier core comprising a first plier blade, a second plier blade, a plier seat, an isolation core, an insulating head cover and a main pin, characterized in that: 1) the first plier blade comprises a first plier head, a first plier tail and a first plier shoulder connecting them, the first plier shoulder comprises a first plier shoulder hole through it; the second plier blade comprises a second plier head, a second plier tail and a second plier shoulder connecting them, the second plier shoulder comprises a second plier shoulder hole through it; 2) the plier seat comprises a plier seat ring body and a first and a second cross- extending fork arms, defining a U-shaped fork cavity, the first fork arm comprises a first arm hole, the second fork arm comprises a second arm hole; 3) the isolation core comprises an isolation plate and an isolation shaft extending transversely, an isolation hole through the isolation shaft and the isolation plate; 4) the insulating head cover comprises an insulating sheet and a head cover through hole through it; 5) the isolation core is installed between the first plier shoulder and the second plier shoulder, wherein the isolation shaft is inserted into the first plier shoulder hole, and the isolation plate separates the first plier shoulder and the second plier shoulder; 6) the plier seat is installed outside the first plier shoulder and the second plier shoulder, wherein the first fork arm is close to the first plier shoulder, the second fork arm is close to the second plier shoulder, and the insulating head cover is installed between the first fork arm and the first plier shoulder, separating them; 7) the main pin passes through the first arm hole, the head cover through hole, the isolation hole, the second plier shoulder hole and the second arm hole in turn, and the two ends of the main pin are riveted or welded with the first fork arm and the second fork arm respectively.

2. The bipolar plier core of claim 1, characterized in that: 1) the main pin comprises a first pin rod and a second pin rod and a third pin rod connecting them, the diameter of the third pin rod is larger than that of the first pin rod and the second pin rod; 2) the first pin rod is riveted or welded with the first fork arm through the first arm hole, and the second pin rod is riveted or welded with the second fork arm through the second arm hole; 3) the first fork arm and the second fork arm are extruded inwardly to form a firm interference fit between the isolation core and the insulating head cover and the third pin rod.

3. The bipolar plier core of claim 1, characterized in that: 1) the bipolar plier core further comprises a main pin sleeve, the main pin sleeve is in contact with the isolation core through the second plier shoulder hole; 2) one end of the main pin is riveted or welded with the first fork arm through the first arm hole, and the other end is riveted or welded with the second fork arm through the second arm hole; 3) the first fork arm and the second fork arm are extruded inwardly to form a firm interference fit between the main pin sleeve and the isolation core and the insulating head cover.

4. The dual polar jawed core of claim 1, wherein: The thickness dimension of the first plier shoulder is B1, the thickness dimension of the second plier shoulder is B2, and the minimum distance between the first plier shoulder and the second plier shoulder is B0≤1.0 mm.

5. The bipolar plier core of claim 4, characterized in that: 1) the thickness dimension of the first plier tail is C1, and the thickness dimension of the second plier tail is C2, wherein C1 2) the dimensions of B0, B1 and B2 are set so that the minimum distance C0 between the first plier tail and the second plier tail is ≥1.0 mm.

6. The dual polarized clamp core of claim 1, wherein: The insulating head cover comprises head cover flanges arranged along the edges of the insulating sheet, the shape and size of the head cover flanges are designed to ensure that the minimum creepage distance D1 between the first prong arm and the first prong shoulder is ≥1.0mm during the process of the first prong and the second prong from closing to opening to the maximum angle.

7. The bipolar plier core according to claim 6, wherein: 1) the main pin is in interference fit with the isolation hole; 2) the main pin is fixed with the first prong arm and the second prong arm by riveting or welding, and the isolation shaft is in interference fit with the insulating sheet, or the isolation shaft is fixed with the insulating sheet by glue.

8. The bipolar plier core according to claim 1, wherein: 1) the bipolar plier core according to any one of claims 1-7 further comprises a driving assembly; the driving assembly comprises a first driving block, a second driving block and a third driving block, the first driving block and the second driving block are made of metal conductor, the third driving block is made of plastic material, the third driving block is arranged between the first and second driving blocks and connects the two blocks into one body and insulates the first and second driving blocks from each other; 2) the driving assembly is installed between the first and second clamping tails, wherein the first driving block and the first clamping tail constitute a first driving pair that can slide with each other, and the second driving block and the second clamping tail constitute a second driving pair that can slide with each other, moving the driving assembly forces the first and second driving pairs to slide simultaneously, thereby forcing the first and second clamps to rotate open and rotate close.

9. The bipolar plier core according to claim 8, wherein: 1) the bipolar plier core further comprises a metal outer tube and an insulating outer tube, the insulating outer tube is wrapped on the outer surface of the metal outer tube, and the metal outer tube is connected with the plier base into one body; 2) the bipolar plier core further comprises a metal inner pull rod and an insulating inner tube, the insulating inner tube is wrapped on the outer surface of the metal inner pull rod, and the metal inner pull rod is connected with the first driving block into one body.

10. An electrosurgical instrument, characterized by The bipolar plier core according to claim 9 further comprises a handle assembly matched therewith, wherein: 1) the handle assembly comprises a handle rotating shaft and a first handle and a second handle rotating around the handle rotating shaft; the first handle is connected with the metal outer tube, and the second handle is connected with the metal inner pull rod; the first and second handles rotate to drive the metal inner pull rod to move relative to the metal outer tube, thereby forcing the driving assembly to move relative to the plier base, thereby driving the first and second clamps to rotate open or rotate close; 2) an electrode plug is arranged in the first handle, the electrode plug comprises a first pole and a second pole; the first pole is in conduction with the metal inner pull rod, and then in conduction with the first driving block, and then in conduction with the first clamp; the second pole is in conduction with the metal outer tube, and then in conduction with the plier base, and then in conduction with the second clamp.

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