Blade driving assembly and electrosurgical instrument

Abstract

The utility model relates to a blade driving assembly and an electrosurgical instrument, and is applied to the field of electrosurgical instruments. The cutter assembly comprises a cutter bar, a sliding piece and a driving piece, and the cutter bar extends in the first direction and can be in driving connection with the blade assembly; the sliding piece is in driving connection with the cutter bar and can move in the first direction. The driving piece is in driving connection with the sliding piece to drive the sliding piece to move in the first direction. Wherein the sliding piece comprises two sliding parts which are detachably connected, a sliding channel for the cutter bar to penetrate through is defined between the two sliding parts, and the cutter bar penetrates through the sliding channel in the first direction and is fixed to the sliding piece. According to the blade driving assembly, the sliding piece is arranged to be the two sliding parts which are detachably connected, so that when the blade driving assembly is assembled, one sliding part can be installed firstly, then the cutter bar is installed, and finally the other sliding part is assembled, and fixing of the cutter bar is achieved. And the sliding part does not need to be pre-assembled to the cutter bar before assembly, so that the mounting convenience is improved.

Description

Technical Field

[0001] The present application relates to the technical field of electrosurgical instruments, and particularly to a blade driving assembly and an electrosurgical instrument. Background Art

[0002] An electrosurgical cutting and coagulating instrument applicable to minimally invasive surgery and its end effector are instruments that can enter the human body through a small wound and cut and coagulate blood vessel tissues, and are also one of the instruments widely used in minimally invasive surgery, mainly used for cutting, transecting, and coagulating tissues in abdominal surgery, gynecology, pediatrics, and thoracic surgery in open or endoscopic surgeries.

[0003] In the related art, a surgical instrument is provided, which includes a handle assembly and a shaft assembly. The handle assembly includes a closing trigger, an energy button, and a firing trigger. The shaft assembly includes an outer tube, a closing actuator, and a firing actuator. The end effector is connected to the distal end of the shaft assembly and includes a jaw assembly having a proximal end and a distal end. The jaw assembly includes a movable jaw member, a fixed jaw member, and a cutting member. The movable jaw member can pivotally move between an open position and a closed position relative to the fixed jaw member. The shank of the cutting member is connected to the firing actuator through a C-shaped slider, so as to be advanced distally in a longitudinal slot. The C-shaped slider can be clamped to the shank along the radial direction of the shank.

[0004] However, in the above cutting mechanism, during assembly, the C-shaped slider needs to be pre-assembled to the shank, and then the assembled whole is assembled into the housing, which has the problem of cumbersome installation operation. Summary of the Utility Model

[0005] Based on this, in view of the problem of cumbersome installation operation existing in the above cutting mechanism, it is necessary to provide a blade driving assembly and an electrosurgical instrument.

[0006] In a first aspect, the present application provides a blade driving assembly, adopting the following technical solution:

[0007] A blade driving assembly includes a shank, a sliding member, and a driving member. The shank extends along a first direction and can be drivingly connected to a blade assembly. The sliding member is drivingly connected to the shank and can move along the first direction. The driving member is drivingly connected to the sliding member to drive the sliding member to move along the first direction. Wherein, the sliding member includes two detachable sliding parts, and a sliding channel for the shank to pass through is formed between the two sliding parts. The shank is disposed in the sliding channel along the first direction and fixed to the sliding member.

[0008] In one embodiment, the sliding member further includes a mounting portion disposed between the two sliding portions. The mounting portion is fixed to any one of the sliding portions, and the sliding channel penetrates through the mounting portion along the first direction.

[0009] In one embodiment, the two sliding portions are configured to be symmetrically distributed with respect to the central axis of the tool shank.

[0010] In one embodiment, one of the sliding portions includes at least one clamping block, and the other sliding portion is provided with a clamping groove corresponding to the clamping block. The clamping block can be inserted into the clamping groove in a fitting manner.

[0011] In one embodiment, the blade driving assembly further includes two limiting members. Along the first direction, the two limiting members are respectively disposed on opposite sides of the sliding member. The tool shank is provided with limiting grooves corresponding to the limiting members. The limiting grooves are arranged along the circumferential direction of the tool shank. The two limiting members can be inserted into the two limiting grooves in a one-to-one correspondence and clamped to the sliding member.

[0012] In one embodiment, the driving member includes a push knife wrench and a transmission gear set. The push knife wrench can be rotatably mounted on the housing. The push knife wrench includes a receiving groove, and a rack portion is formed on the groove wall of the receiving groove. The transmission gear set can be drivingly connected between the sliding member and the rack portion and is at least partially received in the receiving groove.

[0013] In one embodiment, the transmission gear set includes a sliding rack, a first gear, and a second gear. The sliding rack is fixed to the sliding member and extends along the first direction. The first gear is disposed in the receiving groove and meshes with the rack portion. The second gear is coaxially fixed to the first gear and meshes with the sliding rack.

[0014] In one embodiment, the blade driving assembly further includes a rotating member for connecting the blade assembly to drive the blade assembly to rotate along the axial direction of the tool shank.

[0015] In one embodiment, the blade driving assembly further includes an abutting member and a reset member abutted between the abutting member and the sliding member. The abutting member can be fixed to the pliers rod. The reset member is sleeved around the periphery of the tool shank and is configured to be able to expand and contract along the first direction.

[0016] In a second aspect, the present application provides an electrosurgical instrument, adopting the following technical solution:

[0017] An electrosurgical instrument includes a jaw assembly, a blade assembly, and the above-mentioned blade driving assembly. The jaw assembly includes a stationary jaw and a movable jaw rotatably mounted on the stationary jaw. The stationary jaw is provided with a tool passage that extends along the first direction. The blade assembly is slidably mounted in the tool passage along the first direction. The blade driving assembly is drivingly connected to the blade assembly to drive the blade assembly to slide along the tool passage.

[0018] For the above-mentioned blade driving assembly, by setting the sliding member as two detachable sliding parts, the blade driving assembly can first install one of the sliding parts during assembly, then install the tool bar, and finally assemble the other sliding part to fix the tool bar. It is not necessary to pre-assemble the sliding member to the tool bar before assembly, which improves the convenience of installation. Description of the Drawings

[0019] Figure 1 It is an overall view of the electrosurgical instrument in an embodiment of the present application.

[0020] Figure 2 It is a schematic structural view of the jaw assembly and the blade assembly in an embodiment of the present application.

[0021] Figure 3 It is a schematic structural view of the jaw assembly and the blade driving assembly in an embodiment of the present application.

[0022] Figure 4 It is an exploded view of the blade driving assembly in an embodiment of the present application.

[0023] Explanation of the Reference Numerals in the Drawings:

[0024] 1. Blade driving assembly; 11. Tool bar; 12. Sliding member; 121. First sliding part; 122. Second sliding part; 1221. Clamping block; 123. Installation part; 13. Driving member; 131. Push knife wrench; 1311. Receiving groove; 132. Transmission gear set; 1321. Sliding rack; 1322. First gear; 1323. Second gear; 133. Rack part; 14. Limiting member; 15. Rotating member; 151. Fixed seat; 152. Knob; 16. Abutting member; 17. Reset member; 2. Jaw assembly; 21. Stationary jaw; 211. Tool passage; 22. Movable jaw; 23. Jaw rod; 231. Inner tube; 232. Outer tube; 3. Blade assembly; 4. Handle; 41. Left half shell; 42. Right half shell; F1. First direction. Detailed Embodiments

[0025] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides a detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings. Many specific details are set forth in the following description to facilitate a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0026] In the description of the present application, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the accompanying drawings. These are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0027] In addition, if terms such as "first" and "second" appear, these terms are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0028] In the present application, unless otherwise clearly specified and limited, if terms such as "install", "connect", "join", "fix", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0029] In this application, unless otherwise clearly specified and limited, when a first feature is described as being "on" or "under" a second feature or the like, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0030] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for illustrative purposes and do not represent the only implementation. Among them, the "first direction" can be the direction where the line connecting the proximal end and the distal end of the electrosurgical instrument is located.

[0031] The following will further elaborate on the embodiments of this application Figures 1-4 in conjunction with the accompanying drawings.

[0032] Refer to Figure 1 and Figure 2 As shown, an embodiment of this application provides an electrosurgical instrument, which can specifically be an instrument that can enter the human body through a small wound and cut and coagulate vascular tissue. The electrosurgical instrument includes a handle 4, a jaw assembly 2 installed on the handle 4, a blade assembly 3 passing through the jaw assembly 2, and a blade driving assembly 1 disposed in the housing of the handle 4 and drivingly connected to the blade assembly 3. The blade driving assembly 1 is used to drive the blade assembly 3 to move.

[0033] Among them, the jaw assembly 2 includes a jaw rod 23 connected to the handle 4. A stationary jaw 21 and a movable jaw 22 are provided at one end of the jaw rod 23 away from the handle 4. The movable jaw 22 is fixed to the outer tube 232 of the jaw rod 23, and the stationary jaw 21 is movably connected to the inner tube 231 of the jaw rod 23 and can rotate relative to the stationary jaw 21 to realize the opening and closing control of the jaw assembly 2.

[0034] Specifically, the stationary jaw 21 is provided with a tool channel 211 extending along the first direction F1. The above-mentioned blade assembly 3 can be slidably installed in the tool channel 211 along the first direction F1. The blade driving assembly 1 is drivingly connected to the blade assembly 3 and can drive the blade assembly 3 to slide along the tool channel 211 to realize the cutting operation on vascular tissue.

[0035] Combined Figure 3 As shown, the blade driving assembly 1 includes a tool bar 11 disposed through the forceps rod 23 and connected to the blade assembly 3, a sliding member 12 fixed to the tool bar 11, and a driving member 13 drivingly connected to the sliding member 12. Among them, the tool bar 11 extends along the first direction F1, and the driving member 13 can drive the sliding member 12 to slide along the first direction F1, so as to drive the blade assembly 3 to move and cut along the first direction F1 by means of the tool bar 11.

[0036] In some other embodiments, the blade driving assembly 1 further includes a rotating member 15 for connecting the blade assembly 3. The rotating member 15 includes a fixed seat 151 fixed to the forceps rod 23 and a knob 152 mounted on the fixed seat 151. In the embodiment of the present application, the fixed seat 151 is snap-fitted to the side wall of the forceps rod 23. The handle 4 includes a left half shell 41 and a right half shell 42 that can be snap-fitted with each other. The left half shell 41 and the right half shell 42 jointly clamp the fixed seat 151 to achieve axial limitation of the fixed seat 151.

[0037] The above-mentioned knob 152 is wrapped around the periphery of the left half shell 41, the right half shell 42 and the fixed seat 151 and is snap-fitted to the fixed seat 151. When the operator rotates the knob 152, it will drive the fixed seat 151 to rotate, further driving the forceps rod 23 to rotate, so as to drive the forceps head assembly 2 and the blade assembly 3 to rotate axially.

[0038] Combined Figure 4 As shown, in some embodiments, the sliding member 12 includes two slidable parts that are detachably connected. In the embodiment of the present application, for the convenience of description, the two slidable parts are respectively named the first slidable part 121 and the second slidable part 122. A sliding channel for the tool bar 11 to pass through is formed between the first slidable part 121 and the second slidable part 122. The tool bar 11 can pass through the sliding channel along the first direction F1 and be fixed to the sliding member 12 to realize the driving connection between the tool bar 11 and the sliding member 12.

[0039] Furthermore, for the convenience of assembly, in the embodiment of the present application, the first slidable part 121 and the second slidable part 122 are configured to be axially symmetric structures with the central axis of the tool bar 11 as the axis, and the first slidable part 121 and the second slidable part 122 are detachably connected by means of snap-fitting.

[0040] Specifically, the first slidable part 121 includes at least one snap block 1221. The snap block 1221 is integrally formed on the end face of the first slidable part 121 facing the second slidable part 122. The second slidable part 122 is provided with a snap groove corresponding to the snap block 1221. The snap block 1221 of the first slidable part 121 can be inserted into the snap groove of the second slidable part 122 along the radial direction of the tool bar 11 to realize the detachable connection between the first slidable part 121 and the second slidable part 122.

[0041] During actual assembly, the first sliding portion 121 and the second sliding portion 122 are connected as a sliding member 12 by means of snap-fitting, and the sliding member 12 is sleeved on the tool bar 11, making the overall structure of the blade driving assembly 1 simpler. In the embodiment of the present application, the first sliding portion 121 and the second sliding portion 122 are preferably snap-fitted up and down. During installation, the second sliding portion 122 can be installed first, then the tool bar 11, and finally the first sliding portion 121 is snapped onto the second sliding portion 122 to fix the tool bar 11. The assembly method selected for the sliding member 12 of the present application omits the step of pre-fixing the tool bar 11 to the C-shaped slider, making the installation of the blade driving assembly 1 more convenient and simplifying the installation steps.

[0042] Refer to Figure 3 and Figure 4 As shown, in some other embodiments, the sliding member 12 further includes an installation portion 123 disposed between the first sliding portion 121 and the second sliding portion 122. The installation portion 123 can be fixed to the first sliding portion 121 or the second sliding portion 122, and the above-mentioned sliding channel can penetrate through the installation portion 123 along the first direction F1. In the embodiment of the present application, only the case where the installation portion 123 is integrally formed with the second sliding portion 122 is illustrated. It can be understood that in other embodiments, the installation portion 123 can also be fixed to the first sliding portion 121 by means such as bonding or integral injection molding to achieve connection with the sliding portion.

[0043] Continue to refer to Figure 4 As shown, in some other embodiments, the blade driving assembly 1 further includes two limiting members 14, and the two limiting members 14 are disposed on opposite sides of the installation portion 123 along the first direction F1. In the embodiment of the present application, two limiting grooves are spaced along the first direction F1 on the tool bar 11, and the two limiting grooves are arranged in one-to-one correspondence with the two limiting members 14.

[0044] During the assembly process, after the tool bar 11 passes through the installation portion 123 along the first direction F1 through the sliding channel, the two limiting grooves are respectively located on opposite sides of the installation portion 123 in the first direction F1. The operator inserts the limiting members 14 into the limiting grooves correspondingly, so that a pair of limiting members 14 jointly clamp the installation portion 123, thereby realizing the limitation of the tool bar 11 in the first direction F1 (axial direction).

[0045] Furthermore, in order to avoid the limiting member 14 from hindering the axial rotation of the tool bar 11, in the embodiment of the present application, the limiting groove is configured as an annular groove and is arranged along the circumferential direction of the tool bar 11, so that the tool bar 11 can realize axial rotation while the axial displacement is restricted.

[0046] Combined with Figure 3 and Figure 4As shown, the driving member 13 includes a push - knife wrench 131 and a transmission gear set 132. Among them, the push - knife wrench 131 is rotatably installed on the handle 4, and the transmission gear set 132 is drivingly connected between the push - knife wrench 131 and the sliding member 12, so that the operator can drive the blade assembly 3 to move along the first direction F1 by rotating the push - knife wrench 131.

[0047] Among them, the push - knife wrench 131 includes a receiving groove 1311. A rack portion 133 is formed on the groove wall of the receiving groove 1311. The transmission gear set 132 can be drivingly connected between the sliding member 12 and the rack portion 133. In the embodiment of the present application, the receiving groove 1311 can be a waist - shaped groove penetrating through the push - knife wrench 131. The rack portion 133 can specifically be an arc - shaped rack integrally formed on the groove wall of the receiving groove 1311, and can specifically be injection - molded, without the need to additionally connect a rack on the push - knife wrench 131, with a simple structure.

[0048] Specifically, the transmission gear set 132 includes a sliding rack 1321, a first gear 1322, and a second gear 1323. The sliding rack 1321 extends along the first direction F1 and is fixed to the side wall of the sliding member 12, specifically, it can be fixed to the side wall of the second sliding portion 122 on the side facing away from the first sliding portion 121. Both the first gear 1322 and the second gear 1323 are common cylindrical gears, and the difference is that the radial dimension of the first gear 1322 is much smaller than the radial dimension of the second gear 1323.

[0049] After assembly, the first gear 1322 can be completely received in the receiving groove 1311 of the push - knife wrench 131 and meshed with the rack portion 133. The first gear 1322 and the second gear 1323 are coaxially fixed, and the second gear 1323 meshes with the above - mentioned sliding rack 1321. The overall structure is compact, which is beneficial to reducing the size of the entire handle 4 in the width direction, or can reserve more accommodation space for other components inside the handle 4.

[0050] When an external force is applied to the push - knife wrench 131, the push - knife wrench 131 rotates relative to the handle 4 under the action of the external force. Thus, through the transmission cooperation between the rack portion 133 and the first gear 1322, the second gear 1323 is driven to rotate. Then, through the transmission cooperation between the second gear 1323 and the sliding rack 1321, the sliding member 12 is pushed to move along the first direction F1. The blade slider drives the tool bar 11 to move along the first direction F1, so that the blade assembly 3 at the front end of the tool bar 11 advances along the tool channel 211 inside the static jaw 21, thereby cutting the tissue clamped between the moving jaw 22 and the static jaw 21.

[0051] Continue to refer to Figure 3 and Figure 4As shown, in some embodiments, the blade driving assembly 1 further includes an abutting member 16 and a reset member 17. The abutting member 16 is sleeved and fixed on the periphery of the pliers rod 23. The reset member 17 is sleeved on the periphery of the knife rod 11 and abuts between the abutting member 16 and the sliding member 12. Along with the movement of the sliding member 12, the reset member 17 will be compressed along the first direction F1.

[0052] In the embodiments of the present application, the reset member 17 may specifically be a spring. After the cutting is completed, the operator removes the external force applied to the push knife wrench 131. The sliding member 12 will return from the end position to the initial position under the push of the reset member 17, thereby driving the knife rod 11 to return to the initial position, causing the blade assembly 3 to return to the initial position along the tool channel 211, and at the same time driving the push knife wrench 131 and the transmission gear set 132 to automatically reset.

[0053] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0054] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A blade drive assembly, characterized in that, The blade driving assembly includes: a tool shank extending in a first direction and capable of drivingly connecting to a blade assembly; a sliding member drivingly connected to the tool shank and capable of moving along the first direction; and a driving member drivingly connected to the sliding member to drive the sliding member to move along the first direction; wherein the sliding member includes two detachable sliding portions, a sliding channel for the tool shank to pass through is formed by enclosing between the two sliding portions, and the tool shank is disposed in the sliding channel along the first direction and fixed to the sliding member.

2. The blade drive assembly according to claim 1, wherein The sliding member further includes a mounting portion disposed between the two sliding portions, the mounting portion is fixed to any one of the sliding portions, and the sliding channel penetrates through the mounting portion along the first direction.

3. The blade drive assembly according to claim 1, wherein, The two sliding portions are configured to be symmetrically distributed with respect to the central axis of the tool shank.

4. The blade drive assembly according to claim 1, wherein One of the sliding portions includes at least one clamping block, and the other sliding portion is provided with a clamping groove corresponding to the clamping block, and the clamping block can be adaptively inserted into the clamping groove.

5. The blade drive assembly according to claim 1, characterized in that, The blade driving assembly further includes two limiting members, along the first direction, the two limiting members are respectively disposed on opposite sides of the sliding member, limiting grooves are formed on the tool shank corresponding to the limiting members, the limiting grooves are arranged along the circumferential direction of the tool shank, and the two limiting members can be respectively inserted into the two limiting grooves and clamped to the sliding member.

6. The blade drive assembly according to claim 1, characterized in that, The driving member includes a push knife wrench and a transmission gear set, the push knife wrench can be rotatably mounted on the housing, the push knife wrench includes a receiving groove, a rack portion is formed on the groove wall of the receiving groove, the transmission gear set can be drivingly connected between the sliding member and the rack portion, and at least part of the transmission gear set is received in the receiving groove.

7. The blade drive assembly according to claim 6, wherein The transmission gear set includes a sliding rack, a first gear and a second gear, the sliding rack is fixed to the sliding member and extends along the first direction, the first gear is disposed in the receiving groove and meshes with the rack portion, and the second gear is coaxially fixed to the first gear and meshes with the sliding rack.

8. The blade drive assembly according to claim 1, characterized in that, The blade driving assembly further includes a rotating member for connecting the blade assembly to drive the blade assembly to rotate along the axial direction of the tool shank.

9. The blade drive assembly according to claim 1, wherein, The blade driving assembly further includes an abutting member and a reset member abutted between the abutting member and the sliding member, the abutting member can be fixed to the pliers rod, the reset member is sleeved around the periphery of the tool shank, and is configured to be able to expand and contract along the first direction.

10. An electrosurgical instrument, characterized in that, The electrosurgical instrument includes: a pliers head assembly including a static pliers head and a movable pliers head rotatably mounted on the static pliers head, a tool channel is formed on the static pliers head, and the tool channel extends along the first direction; a blade assembly slidably mounted along the first direction in the tool channel; and the blade driving assembly according to any one of claims 1-9, drivingly connected to the blade assembly to drive the blade assembly to slide along the tool channel.

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