Cutting assembly and surgical sagittal saw
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SUZHOU MICROPORT ORTHOBOT CO LTD
- Filing Date
- 2023-02-03
- Publication Date
- 2026-06-19
Smart Images
Figure CN116115290B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of medical device technology, and in particular to a cutting assembly and a surgical sagittal saw. Background Technology
[0002] The sagittal saw is a commonly used power surgical tool in orthopedic surgery. Typically, a sagittal saw includes a handheld part with a motor and its drive control circuit. The motor drives a vibrating head component, and the saw head is detachably connected to the vibrating head. The end of the saw head away from the vibrating head has serrations, which oscillate back and forth under the drive of the vibrating head to cut the nearby hard tissue.
[0003] In use, a sagittal saw typically needs to be used in conjunction with an osteotomy guide. The precisely shaped grooves on the osteotomy guide limit the direction of movement of the sagittal saw head to achieve precise cutting. However, this guiding function inevitably leads to friction between the saw head and the grooves of the osteotomy guide. This friction first causes wear on the grooves, reducing their precision and affecting the cutting effect. Secondly, the metal fragments generated by the friction are prone to falling into the surgical wound, which is detrimental to the patient's wound healing. Furthermore, the vibrating planar saw head will rub against the bone surface and generate heat during osteotomy, which is also detrimental to the patient's wound recovery.
[0004] Some existing sagittal saws have a sheath for the saw head to prevent direct contact between the saw head and the osteotomy guide. However, these sagittal saws directly drive the saw blade to swing through a vibrating head. In order for the sagittal saw to reach the cutting position, the saw blade is usually made to be relatively long. However, a long saw blade results in an excessive swing amplitude during the cutting process. When the saw blade comes into contact with the patient's bone surface, it will generate large vibrations and deformations, which will seriously affect the cutting accuracy of the saw blade on the patient's bone surface. Summary of the Invention
[0005] Therefore, it is necessary to provide a cutting assembly and a surgical sagittal saw to address the problem of low cutting accuracy of the saw blade bar of existing sagittal saws on the patient's bone surface.
[0006] A cutting component, comprising:
[0007] shell;
[0008] A swing arm is partially pivotally connected inside the housing, and the swing arm has a cut-out portion at the end extending out of the housing;
[0009] A linkage assembly is disposed inside the housing. The linkage assembly has a head end and an end end. The linkage assembly includes one or more links that are sequentially and movably connected relative to each other. The link at the end of the linkage assembly is connected to the swing rod. The link at the head end of the linkage assembly is connected to a vibration component. The vibration component is used to drive the swing motion of the link to cause the swing rod to swing.
[0010] In one embodiment, one of the swing rod and the end is provided with a limiting member, and the other is provided with a guide structure, wherein the limiting member and the guide structure are movable relative to each other; and / or;
[0011] One of the two adjacent connecting rods is provided with the limiting member, and the other of the two is provided with the guide structure. The limiting member and the guide structure are movable and cooperate with each other.
[0012] In one embodiment, the relative movement direction of the limiting member and the guide structure is along the length direction of the swing rod or the connecting rod.
[0013] In one embodiment, the outer casing has an arc-shaped groove;
[0014] The connecting rod at the first end of the connecting rod assembly is provided with the limiting member, which is movably inserted into the arc-shaped groove.
[0015] In one embodiment, the swing rod and the housing are pivotally connected by a first rotating pin, one of the swing rod and the housing is provided with the first rotating pin, and the other of the two is provided with a first rotating hole corresponding to the first rotating pin.
[0016] In one embodiment, the linkage assembly includes a first linkage located at its head end and one or more second linkages that are movably connected to the first linkage in sequence and movably connected to each other. The second linkages are pivotally connected to the housing via a second rotating pin. One of the second linkages and the housing is provided with a second rotating pin, and the other of the two is provided with a second rotating hole corresponding to the second rotating pin.
[0017] In one embodiment, the linkage assembly includes a plurality of links arranged sequentially along their length, and adjacent links are movable.
[0018] In one embodiment, the first end of the connecting rod assembly is provided with a first notch, which is connected to the outside of the housing and is used to connect the vibration assembly.
[0019] In one embodiment, the end of the housing is provided with a second notch corresponding to the first notch, the first end of the connecting rod assembly is provided with a first through hole communicating with the first notch, the end of the housing is provided with a second through hole communicating with the second notch, the first through hole and the second through hole are coaxial and are used to pass through the saw blade clamping assembly.
[0020] In one embodiment, the housing has at least one positioning hole for positioning and insertion of the saw blade clamping assembly.
[0021] A surgical sagittal saw includes a vibrating head, a drive assembly, a vibration assembly, a saw blade clamping assembly, and a cutting assembly as described in any of the above technical solutions. The drive assembly and the vibration assembly are both mounted on the vibrating head. The drive assembly is used to drive the movement of the vibration assembly. The vibration assembly is connected to the head end of the linkage assembly. The saw blade clamping assembly is used to fix the cutting assembly to the vibrating head.
[0022] In one embodiment, the vibrating head is provided with a limiting structure, which fixes the circumferential position of the pressure plate and the vibrating head.
[0023] The aforementioned cutting assembly and surgical sagittal saw, when the vibration assembly drives the connecting rod to swing, cause the swing arm to swing, allowing the cutting part at the end of the swing arm to act on the cutting position and complete the osteotomy for the patient. The swing arm is pivotally connected inside the housing, preventing metal debris generated by friction between the swing arm and the osteotomy guide plate during swing from entering the patient's body, thus aiding in the recovery of the cut site. Due to the design of the connecting rod, the length of the swing arm can be set to be smaller, correspondingly reducing the vibration and deformation of the swing arm and connecting rod assembly during the cutting process, improving the cutting accuracy of the cutting part on the patient's bone surface. Furthermore, the smaller swing amplitude of the swing arm during the cutting process reduces the contact area between the swing arm and the housing, reducing the frictional heat generation effect of the swing arm during cutting, resulting in a lower temperature rise on the bone surface, which is beneficial for wound healing. In addition, the connection between the cutting assembly and the vibration assembly can be directly connected, making installation convenient. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the structure of a surgical sagittal saw after assembly in one embodiment;
[0025] Figure 2 This is a schematic diagram of the structure of a surgical sagittal saw before assembly in one embodiment;
[0026] Figure 3 This is a cross-sectional view of a surgical sagittal saw in one embodiment;
[0027] Figure 4 for Figure 3 Sectional view along line AA;
[0028] Figure 5 This is an exploded view of the cutting component in one embodiment;
[0029] Figure 6 This is a schematic diagram of the cutting component in one embodiment;
[0030] Figure 7This is a schematic diagram of the cutting component in another embodiment;
[0031] Figure 8 This is a schematic diagram of the cutting component in another embodiment;
[0032] Figure 9 This is a schematic diagram illustrating the cooperation between the saw blade clamping assembly and the cutting assembly in a surgical sagittal saw in one embodiment;
[0033] Figure 10 This is a schematic diagram of the fit between the vibrating pin and the vibrating shaft in one embodiment;
[0034] Figure 11 This is an exploded view of a surgical sagittal saw in one embodiment;
[0035] Figure 12 This is a schematic diagram showing the cooperation of the lifting component during the installation of the cutting component in one embodiment;
[0036] Figure 13 This is a schematic diagram showing the engagement of the lifting component during the disassembly of the cutting component in one embodiment;
[0037] Figure 14 This is a schematic diagram illustrating the interaction between the vibrating head and the cutting assembly in a surgical sagittal saw in one embodiment;
[0038] Figure 15 This is an exploded schematic diagram of a surgical sagittal saw in one embodiment. Detailed Implementation
[0039] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
[0040] The drive assembly of this invention can utilize existing drive assemblies, which include an eccentric shaft, a spherical bearing, and a shift fork, and are equipped with a drive motor. The input end of the eccentric shaft can be connected to the output shaft of the drive motor. The spherical bearing is sleeved on the output end of the eccentric shaft, and the shift fork is sleeved on the outer wall of the spherical bearing and fixedly connected to the vibration shaft. When the eccentric shaft performs circular motion under the drive of the drive motor, the spherical bearing performs eccentric circular motion at the output end of the eccentric shaft. Since the shift fork is sleeved on the spherical bearing, it is also driven to perform reciprocating oscillating motion, which in turn drives the vibration shaft to rotate.
[0041] In existing technologies, the connection between the cutting component and the vibratory shaft drive involves aligning the cutting component and fitting it onto the eccentric output end of the vibratory shaft. This requires first removing the saw blade clamping component to expose the output end of the vibratory shaft, then aligning and fitting the cutting component onto the output end of the vibratory shaft, and finally installing the saw blade clamping component onto the vibratory shaft to fix the cutting component. Because the cutting component and the output end of the vibratory shaft are relatively small, the process of aligning and installing the cutting component is cumbersome and significantly impacts work efficiency. Furthermore, directly driving the cutting component to reciprocate requires a longer component, but a longer component results in excessive oscillation during cutting. When the component contacts the patient's bone surface, it generates significant vibration and deformation, severely affecting the cutting accuracy. Additionally, the larger area swept across the outer shell during cutting generates more heat due to friction, which is detrimental to wound healing.
[0042] To address this, the present invention provides a novel cutting assembly 100, see reference. Figure 1 , Figure 2 , Figure 3 as well as Figure 4 , Figure 1 This diagram shows the assembled structure of the surgical sagittal saw 200 according to one embodiment of the present invention. Figure 2 This is a schematic diagram of the surgical sagittal saw 200 before assembly. Figure 3 This is a cross-sectional view of a surgical sagittal saw 200. Figure 4 This is a partial cross-sectional view of a surgical sagittal saw 200. The surgical sagittal saw 200 includes a cutting assembly 100, a body 210, a vibrating head 220, a drive assembly 230, a vibration assembly 240, and a saw blade clamping assembly 250. The body 210 is for the user to hold and operate. The vibrating head 220 is mounted on the body 210. Both the drive assembly 230 and the vibration assembly 240 are mounted on the vibrating head 220. The drive assembly 230 is used to drive the movement of the vibration assembly 240. The vibration assembly 240 is connected to the beginning end 131 of the connecting rod assembly 130. The saw blade clamping assembly 250 is used to fix the cutting assembly 100 to the vibrating head 220.
[0043] like Figure 5 As shown, the present invention provides a cutting assembly 100, which includes a housing 110, a swing rod 120, and a connecting rod assembly 130. In this embodiment, the housing 110 is formed by splicing two opposing housings together, which can be configured as a common half-type structure. For example, a wall is formed around the two housings to connect them, and an installation space for the swing rod 120 and the connecting rod assembly 130 is formed in the middle of the housing 110. The housing 110 can confine the swing rod 120 and the connecting rod assembly 130 to move within this installation space, which can improve the reliability of the cutting assembly 100 during operation.
[0044] The swing arm 120 is pivotally connected to the inside of the housing 110, allowing the swing arm 120 to swing on the housing 110. The end of the swing arm 120 extending out of the housing 110 has a cutting portion 121. In this embodiment, the cutting portion 121 is a serrated structure provided at the end of the swing arm 120, so that during the swinging of the swing arm 120, the cutting portion 121 can act on the cutting position and complete the osteotomy for the patient.
[0045] Continue as Figures 6-8 As shown, the linkage assembly 130 is disposed inside the housing 110, and the linkage assembly 130 has a head end 131 and a tail end 132. The linkage assembly 130 includes one or more linkages 133 that are sequentially and movably connected relative to each other. In one embodiment, as... Figure 6 As shown, the linkage assembly 130 includes only one link 133. In this case, the first end 131 and the last end 132 of the linkage assembly 130 are the two ends of the link 133. In another embodiment, the linkage assembly 130 includes multiple links 133 that are sequentially and movably connected relative to each other. The multiple links 133 are arranged sequentially along their length, and adjacent links 133 are movable. For example, there can be two links 133, such as... Figure 7 As shown, if the two connecting rods 133 are defined as a first connecting rod 133a and a second connecting rod 133b connected to each other, then the first end 131 of the connecting rod assembly 130 is the end of the first connecting rod 133a away from the second connecting rod 133b, and the last end 132 of the connecting rod assembly 130 is the end of the second connecting rod 133b away from the first connecting rod 133a. Alternatively, there can be three connecting rods 133, such as... Figure 8As shown, if the three connecting rods 133 are defined as one first connecting rod 133a and two second connecting rods 133b, with one end of each of the two second connecting rods 133b connected to each other, and the other end of one of the second connecting rods 133b connected to the first connecting rod 133a, then the first connecting rod 133a and the two second connecting rods 133b have two suspended ends after connection. The suspended end of the first connecting rod 133a is the head end 131 of the connecting rod assembly 130, and the suspended end of the second connecting rod 133b is the tail end 132 of the connecting rod assembly 130. Of course, in other feasible embodiments, the number of connecting rods 133 included in the connecting rod assembly 130 can be specifically set according to requirements. The connecting rod 133 at the end 132 of the connecting rod assembly 130 is connected to the swing rod 120, and the connecting rod 133 at the beginning 131 of the connecting rod assembly 130 is connected to the vibration component 240. The vibration component 240 is used to drive the swing motion of the connecting rod 133 to drive the swing rod 120 to swing. In this design, the swinging rod 120 can be driven to swing by one or more connecting rods 133. This reduces the torque borne by the swinging rod 120 and the single connecting rod 133 while keeping the total length of the swinging rod 120 and the connecting rod assembly 130 constant. Consequently, the vibration and deformation of the swinging rod 120 and the connecting rod assembly 130 during the cutting process are reduced, thereby improving the cutting accuracy of the cutting part 121 on the patient's bone surface. Furthermore, the swinging amplitude of the swinging rod 120 during the cutting process is smaller, and the contact area between the swinging rod 120 and the outer shell 110 is reduced, which can reduce the frictional heat generation effect of the swinging rod 120 during the cutting process. The bone surface temperature rise is lower, which is beneficial to wound healing. Alternatively, a cutting assembly 100 with a longer total length can be designed under the same load conditions as the swinging rod 120 and the connecting rod assembly 130 to adapt to different surgical needs.
[0046] The aforementioned cutting assembly 100, with its swing rod 120 pivotally connected inside the housing 110, prevents direct contact between the swing rod 120 and the osteotomy guide plate. This avoids metal debris generated during the swinging process from entering the patient's body, thus aiding in the recovery of the cut area 121. The length of the swing rod 120 can be set to be relatively small, reducing its swing amplitude. This reduces the frictional heat generated during the cutting process, resulting in a lower temperature rise on the bone surface, which is beneficial for wound healing. Furthermore, it broadens the operator's field of vision.
[0047] In one embodiment, such as Figure 5 and Figure 8As shown, one of the swing rod 120 and the end 132 is provided with a limiting member 140, and the other of the swing rod 120 and the end 132 is provided with a guide structure 150. In other words, one of the swing rod 120 and the linkage assembly 130 is provided with a limiting member 140, and the other of the swing rod 120 and the linkage assembly 130 is provided with a guide structure 150. When the limiting member 140 or the guide structure 150 is located on the linkage assembly 130, the limiting member 140 and the guide structure 150 are located at the end 132 of the linkage assembly 130. The limiting member 140 and the guide structure 150 are relatively movable and cooperate. When the vibration assembly 240 drives the connecting rod assembly 130 to swing, the limiting member 140 on the connecting rod assembly 130 moves relative to the guide structure 150 on the swing rod 120, or the guide structure 150 on the connecting rod assembly 130 moves relative to the limiting member 140 on the swing rod 120. The relative movement direction of the limiting member 140 and the guide structure 150 is along the length direction of the swing rod 120 or the connecting rod 133, causing the connecting rod assembly 130 to drive the swing rod 120 to swing. During the swing of the swing rod 120, the cutting part 121 performs osteotomy on the patient. Of course, in other feasible embodiments, a flexible member can be used instead of the cooperation between the limiting member 140 and the guide structure 150. Specifically, one end of the flexible component can be connected to the end 132 of the linkage assembly 130, and the other end of the flexible component can be connected to the swing rod 120. When the vibration assembly 240 drives the linkage assembly 130 to swing, the linkage assembly 130 drives the swing rod 120 to swing through the flexible component. The flexible component can be a spring, bellows cover, or other component that can deform under external force. On the one hand, the flexible component can transmit the swing force of the linkage assembly 130 to the swing rod 120, driving the movement of the swing rod 120; on the other hand, the flexible component has a certain deformation during the force process, which can provide a certain clearance space and prevent the linkage assembly 130 and the swing rod 120 from locking up during relative movement.
[0048] Furthermore, such as Figure 7 and Figure 8As shown, if the linkage assembly 130 includes multiple sequentially movably connected linkages 133, one of two adjacent linkages 133 is provided with a limiting member 140, and the other of two adjacent linkages 133 is provided with a guide structure 150. The limiting member 140 and the guide structure 150 are movably engaged with each other. Since the vibration assembly 240 is connected to the linkage 133 at the first end 131 of the linkage assembly 130, when the vibration assembly 240 drives the linkage 133 at the first end 131 to swing, through the relative movement of the limiting member 140 and the guide structure 150, and the relative movement direction of the limiting member 140 and the guide structure 150 is along the length direction of the swing rod 120 or the linkage 133, the swing movement of the linkage 133 at the first end 131 can be sequentially transmitted to the subsequent linkages 133 while avoiding locking, so that the linkage assembly 130 as a whole swings, thereby driving the swing rod 120 to swing.
[0049] In this embodiment, the guide structure 150 is a slot or a through hole. For example, in this embodiment, the limiting member 140 is a moving pin, and the guide structure 150 is a slotted hole formed on the connecting rod assembly 130 or the swing rod 120. Because the slotted hole provides a certain clearance, the limiting member 140 can move within the guide structure 150, or the guide structure 150 can move on the limiting member 140. This prevents the relative movement between the connecting rod assembly 130 and the swing rod 120, or the relative movement between the connecting rods 133 inside the connecting rod assembly 130, from locking up. In other embodiments, the guide structure 150 can be a slotted hole, a square hole, or similar, as long as it satisfies the requirement that the limiting member 140 can move within the guide structure 150, or that the guide structure 150 can move on the limiting member 140.
[0050] In order for the vibration assembly 240 to drive the swing motion of the linkage assembly 130, a preferred embodiment is as follows: Figure 5 and Figure 8 As shown, the outer casing 110 has an arc-shaped groove 111. A limiting member 140 is provided on the connecting rod 133 at the first end 131 of the connecting rod assembly 130, and the limiting member 140 is movably inserted into the arc-shaped groove 111. When the vibration assembly 240 moves, the limiting member 140 on the connecting rod 133 at the first end 131 of the connecting rod assembly 130 moves within the arc-shaped groove 111, enabling the vibration assembly 240 to drive the swinging motion of the connecting rod assembly 130, and the arc-shaped groove 111 can limit the swinging path of the connecting rod 133 at the first end 131 of the connecting rod assembly 130.
[0051] To reduce the vibration amplitude of the swing arm 120 during the cutting process, a preferred embodiment is as follows: Figure 5As shown, the swing arm 120 and the outer casing 110 are pivotally connected together by a first rotating pin 160. One of the swing arm 120 and the outer casing 110 is provided with the first rotating pin 160, and the other of the swing arm 120 and the outer casing 110 is provided with a first rotating hole 170, and the first rotating hole 170 corresponds to the first rotating pin 160. In other words, if the first rotating pin 160 is provided on the swing arm 120, then the first rotating hole 170 is formed in the outer casing 110; if the first rotating pin 160 is provided on the outer casing 110, then the first rotating hole 170 is formed in the swing arm 120. During the swinging motion of the swing rod 120, the swing rod 120 can swing around the first rotating pin 160 as the rotation center. This reduces the vibration amplitude of the swing rod 120 on the outer shell 110, improves the cutting accuracy of the cutting part 121 on the patient's bone surface, and reduces the contact area between the swing rod 120 and the outer shell 110 during the swinging process. This reduces the frictional heat generation effect of the swing rod 120 during the cutting process, resulting in a lower temperature rise on the bone surface, which is beneficial for wound healing. Preferably, the first rotating pin 160 or the first rotating hole 170 is located at the middle position of the swing rod 120, which reduces the size of the rotating arm of the swing rod 120, thereby minimizing the vibration amplitude of the swing rod 120 on the outer shell 110.
[0052] Furthermore, such as Figure 8As shown, the linkage assembly 130 includes a first link 133a located at its first end 131, or includes a first link 133a located at its first end 131 and one or more second links 133b that are movably connected to the first link 133a in sequence. In other words, if the linkage assembly 130 includes only one link 133, then the link 133 is the first link 133a. If the linkage assembly 130 includes multiple links 133, then the link 133 forming the first end 131 of the linkage assembly 130 is the first link 133a, and the other links 133 are all second links 133b. The second connecting rod 133b is pivotally connected to the housing 110 via a second rotating pin 180. One of the second connecting rod 133b and the housing 110 is provided with the second rotating pin 180, and the other of the second connecting rod 133b and the housing 110 is provided with a second rotating hole 190, which corresponds to the second rotating pin 180. In other words, if the second rotating pin 180 is located on the second connecting rod 133b, then the second rotating hole 190 is located on the housing 110; if the second rotating pin 180 is located on the housing 110, then the second rotating hole 190 is located on the second connecting rod 133b. During the swinging process of the connecting rod assembly 130, the second connecting rod 133b can swing around the second rotating pin 180 as the rotation center, which can reduce the vibration amplitude of the connecting rod assembly 130 on the housing 110, thereby reducing the contact area between the connecting rod assembly 130 and the housing 110 during the swinging process, reducing the frictional heat generation effect of the connecting rod assembly 130 during the swinging process, and resulting in a lower temperature rise on the bone surface, which is beneficial to wound healing. Preferably, the second rotating pin 180 or the second rotating hole 190 is located at the middle position of the second connecting rod 133b, which can reduce the size of the rotating arm of the second connecting rod 133b, thereby minimizing the vibration amplitude of the connecting rod assembly 130 on the housing 110.
[0053] It should be noted that, in this embodiment, as Figures 6-8 As shown, the connecting rod assembly 130 and the swing rod 120 are sequentially and movably connected relative to each other. When the vibration assembly 240 drives the connecting rod 133 at the beginning 131 of the connecting rod assembly 130 to swing, according to the principle of force, in order to prevent the connecting rods 133 from locking up, the swing directions of adjacent connecting rods 133 are opposite, and the swing direction of the connecting rod 133 at the end 132 of the connecting rod assembly 130 is also opposite to the swing direction of the swing rod 120. Since the length and mass of each connecting rod 133 and the swing rod 120 are relatively close, the inertial forces generated by each connecting rod 133 and the swing rod 120 during the swing are opposite in direction. In this way, the inertial forces generated by each connecting rod 133 and the swing rod 120 can be partially or completely canceled out, which can significantly reduce the adverse phenomenon of vibration of the connecting rod assembly 130 and the swing rod 120 during the swing.
[0054] To facilitate the assembly of the cutting component 100, a preferred embodiment is as follows: Figure 5 As shown, the first end 131 of the connecting rod assembly 130 has a first notch 134, which communicates with the outside of the housing 110 and is used to connect the vibration assembly 240. Preferably, the first notch 134 is integrally formed with the connecting rod assembly 130 by injection molding, compression molding, or other methods to simplify the molding process of the connecting rod assembly 130 and reduce its manufacturing cost.
[0055] Compared to traditional cutting component installation methods, the aforementioned cutting component 100 involves a more cumbersome alignment and installation process, which negatively impacts work efficiency. In this embodiment, by creating a first notch 134 at the head end 131 of the connecting rod assembly 130, the cutting component 100 is no longer connected to the output end of the vibration shaft 241 through alignment and fitting. Instead, the cutting component 100 is simply pushed in the direction opposite to the extension of the cutting part 121 and inserted into the first notch 134 to complete the connection between the cutting component 100 and the vibration assembly 240. This simplifies the installation of the cutting component 100 and improves its installation efficiency.
[0056] In one embodiment, such as Figure 5 As shown, the end of the outer casing 110 has a second notch 112 corresponding to the first notch 134, and the projection of the second notch 112 onto the first notch 134 covers the first notch 134. In other words, the size of the second notch 112 should be larger than the first notch 134. With this configuration, when the cutting assembly 100 is pushed toward the output end of the vibration shaft 241, the output end of the vibration shaft 241 first enters the second notch 112 of the outer casing 110, and then enters the first notch 134 of the connecting rod assembly 130. When the output end of the vibration shaft 241 reciprocates, it is not constrained by the second notch 112, and can freely push the two side walls of the first notch 134 to make the connecting rod assembly 130 swing.
[0057] In one embodiment, such as Figure 2 and Figure 5 As shown, the first end 131 of the connecting component has a first through hole 135 that communicates with the first notch 134. The end of the housing 110 has a second through hole 113 that communicates with the second notch 112. The first through hole 135 and the second through hole 113 are coaxial and are used to pass through the saw blade clamping component 250.
[0058] The cutting assembly 100 described above has a first through hole 135 provided at the beginning 131 of the connecting rod assembly 130 and a second through hole 113 provided on the outer shell 110. The space between the first through hole 135 and the second through hole 113 can be used to install the saw blade clamping assembly 250. On the one hand, this makes the structure of the vibrating head 220 more compact. On the other hand, the saw blade clamping assembly 250 located on the connecting rod assembly 130 can apply force evenly to the outer shell 110, ensuring the stability of the cooperation between the cutting assembly 100 and the vibrating assembly 240 and improving the fixing effect of the saw blade clamping assembly 250 on the cutting assembly 100.
[0059] Furthermore, such as Figure 5 As shown, the outer casing 110 has at least one positioning hole 114 for the positioning insertion of the saw blade clamping assembly 250. Wherein, as Figure 9 As shown, a positioning pin 254 that mates with the positioning hole 114 is provided on the saw blade clamping assembly 250. When the saw blade clamping assembly 250 fixes the cutting assembly 100, the positioning pin 254 of the saw blade clamping assembly 250 can be inserted into the positioning hole 114 to pre-position the saw blade clamping assembly 250 and the cutting assembly 100. The positioning and alignment between the two can be completed in one go, which facilitates the subsequent fixing operation of the cutting assembly 100.
[0060] In addition, such as Figure 1 , Figure 3 and Figure 4 As shown, the present invention also provides a surgical sagittal saw 200, which includes a body 210, a vibrating head 220, a drive assembly 230, a vibration assembly 240, a saw blade clamping assembly 250, and a cutting assembly 100 as described in any of the above technical solutions. The body 210 is for user gripping, the vibrating head 220 is mounted on the body 210, and both the drive assembly 230 and the vibration assembly 240 are mounted on the vibrating head 220. The drive assembly 230 is used to drive the movement of the vibration assembly 240. Specifically, as shown... Figure 3 and Figure 4As shown, the drive assembly 230 includes an eccentric shaft 231, a spherical bearing 232, and a shift fork 233, and is equipped with a drive motor 211. The input end of the eccentric shaft 231 can be connected to the output shaft of the drive motor 211. The spherical bearing 232 is sleeved on the output end of the eccentric shaft 231, and the shift fork 233 is sleeved on the outer wall of the spherical bearing 232 and fixedly connected to the vibration shaft 241. When the eccentric shaft 231 performs circular motion under the drive of the drive motor 211, the spherical bearing 232 performs eccentric circular motion on the output end of the eccentric shaft 231. Since the shift fork 233 is sleeved on the spherical bearing 232, the shift fork 233 is also driven to perform reciprocating oscillating motion, which in turn drives the vibration shaft 241 to rotate. The vibration assembly 240 is connected to the first end 131 of the connecting rod assembly 130, and the saw blade clamping assembly 250 is used to fix the cutting assembly 100 to the vibration head 220.
[0061] In the aforementioned surgical sagittal saw 200, when the vibration assembly 240 drives the connecting rod 133 to swing, the connecting rod 133 can drive the swinging rod 120 to swing, causing the cutting part 121 at the end of the swinging rod 120 to act on the cutting position and complete the osteotomy for the patient. The cutting assembly 100 has high cutting precision, and the swinging amplitude of the swinging rod 120 during the cutting process is small, which can reduce the frictional heat generation effect of the swinging rod 120 during the cutting process, resulting in a low temperature rise on the bone surface, which is beneficial to wound healing. In addition, the installation between the cutting assembly 100 and the vibration head 220 is convenient, which can improve the installation efficiency of the cutting assembly 100.
[0062] In one embodiment, such as Figure 5 , Figure 6 , Figure 10 as well as Figure 11 As shown, the first end 131 of the connecting rod assembly 130 has a first notch 134 and a first through hole 135, which are connected. The vibration assembly 240 includes a vibration shaft 241 and a vibration pin 242, with the vibration pin 242 eccentrically mounted on the vibration shaft 241. Specifically, the vibration shaft 241 has a mounting hole at a position off its axis, and the vibration pin 242 can be connected to the mounting hole by screwing to eccentrically mount the vibration pin 242 on the vibration shaft 241; alternatively, the vibration pin 242 can be inserted into the mounting hole by a tight fit to eccentrically mount the vibration pin 242 on the vibration shaft 241; or, the vibration pin 242 and the vibration shaft 241 can be integrally formed by injection molding, compression molding, etc., with the vibration pin 242 also eccentrically mounted on the vibration shaft 241. The vibration pin 242 is inserted into the first notch 134, and a third through hole 243 is provided at the center of the vibration shaft 241.
[0063] The aforementioned surgical sagittal saw 200 has a vibrating pin 242 inserted into the first notch 134. Since the vibrating pin 242 is eccentrically positioned on the vibrating shaft 241, when the vibrating shaft 241 moves, the vibrating pin 242 reciprocates. The vibrating pin 242 applies force to the groove wall of the first notch 134 and drives the connecting rod assembly 130 to swing. The connecting rod assembly 130 drives the swinging rod 120 to swing, so that the cutting part 121 at the end of the swinging rod 120 acts on the cutting position and completes the osteotomy for the patient.
[0064] For mounting the cutting assembly 100, a preferred embodiment is as follows: Figure 3 and Figure 9 As shown, the saw blade clamping assembly 250 includes a pressure plate 251 and a connecting shaft 252. The pressure plate 251 has a center pin 253, which is inserted into the connecting shaft 252 and passes through a first through hole 135. When the center pin 253 passes through the first through hole 135, the cutting assembly 100 can be fixed to the vibrating head 220, completing the installation and fixation of the cutting assembly 100, which is simple to install. Furthermore, when the vibrating pin 242 drives the connecting rod assembly 130 to swing, the connecting rod 133 near its head 131 can swing around the center pin 253. The connecting shaft 252 passes through a third through hole 243 to house the connecting shaft 252 within the vibrating head 220.
[0065] For the installation and disassembly of the cutting assembly 100, a preferred embodiment is as follows: Figure 11 As shown, the surgical sagittal saw 200 also includes a lifting assembly 260, which is connected to the connecting shaft 252. The lifting assembly 260 is used to drive the pressure plate 251 to move in a direction close to or away from the vibrating head 220. When the lifting assembly 260 drives the pressure plate 251 to move in a direction close to the vibrating head 220, the pressure plate 251 can press the cutting assembly 100 and fix the cutting assembly 100 to the vibrating head 220, thus performing the installation operation of the cutting assembly 100. Conversely, when the lifting assembly 260 drives the pressure plate 251 to move in a direction away from the vibrating head 220, there is a gap between the pressure plate 251 and the vibrating head 220, and the cutting assembly 100 can be pulled out from the gap between the pressure plate 251 and the vibrating head 220, thus performing the disassembly operation of the cutting assembly 100.
[0066] Specifically, such as Figure 3 and Figure 11As shown, the lifting assembly 260 includes a rotary switch 261, a pin 262, a spring 263, and a fixed shaft 264. The rotary switch 261 is rotatably disposed at the end of the vibrating head 220 away from the saw blade clamping assembly 250. The rotary switch 261 has a receiving groove 265 and a protrusion 266. One end of the pin 262 has a base plate 267. Both the pin 262 and the base plate 267 are movably disposed within the receiving groove 265. The pin 262 and the base plate 267 are movably assembled with the receiving groove 265 relative to each other in the axial direction of the fixed shaft 264. The end of the pin 262 away from the base plate 267 extends out of the receiving groove 265, and the end of the pin 262 extending out of the receiving groove 265 is connected to the connecting shaft 252. Spring 263 is sleeved on ejector pin 262, with one end of spring 263 abutting against the wall of receiving groove 265 and the other end abutting against base plate 267. Fixed shaft 264 is fixed to vibrating head 220 by sleeve. A sloping track 268 is provided on the side of fixed shaft 264 near rotary switch 261. The sloping track 268 has a slope in the circumferential direction surrounding the axis of fixed shaft 264, allowing protrusion 266 to move within the sloping track 268. Furthermore, a slot 269 is provided on the sloping track 268, so that when protrusion 266 moves within the sloping track 268, there is a position where protrusion 266 engages with slot 269.
[0067] The above-mentioned surgical sagittal saw 200, such as Figure 3 and Figure 11 As shown, when it is necessary to press and fix the cutting assembly 100, the rotary switch 261 can be turned in a certain direction. The protrusion 266 on the rotary switch 261 moves within the inclined track 268. Since the fixed shaft 264 cannot move on the vibrating head 220, the rotary switch 261 can be turned in a direction away from the vibrating head 220 (in... Figure 3 The middle part moves downwards. The groove wall of the receiving groove 265 abuts against one end of the spring 263 and compresses the spring 263. Under the elastic action of the spring 263, the other end of the spring 263 can apply an elastic force to the bottom plate 267, causing the ejector pin 262 to move away from the vibrating head 220. The ejector pin 262 pulls the connecting shaft 252 to move away from the vibrating head 220. Since the connecting shaft 252 is connected to the pressure plate 251 through the center pin 253, the connecting shaft 252 can drive the pressure plate 251 to move towards the vibrating head 220, causing the pressure plate 251 to press down and apply a force to the cutting assembly 100, fixing the cutting assembly 100 to the vibrating head 220. In this embodiment, in order to improve the fixing reliability of the pressure plate 251 to the cutting assembly 100, the following continues... Figure 12As shown, when the cutting assembly 100 is fully fixed, the protrusion 266 is engaged in the slot 269. The slot 269 can limit the protrusion 266, preventing it from continuing to slide on the sloped track 268. In this state, the spring 263 is compressed, storing energy. The elastic force of the spring 263 keeps the ejector pin 262 pulling the connecting shaft 252, improving the reliability of the pressure plate 251 on the cutting assembly 100. Conversely, continuing as... Figure 13 As shown, when the cutting assembly 100 needs to be disassembled, the rotary switch 261 can be turned in the opposite direction to the above. The protrusion 266 on the rotary switch 261 separates from the slot 269 and performs a reset movement in the inclined track 268. At this time, the rotary switch 261 drives the ejector pin 262 to move towards the vibrating head 220. The ejector pin 262 pushes the connecting shaft 252 to move towards the vibrating head 220. Since the connecting shaft 252 is connected to the pressure plate 251 through the center pin 253, the connecting shaft 252 can drive the pressure plate 251 to move away from the vibrating head 220, so that the pressure plate 251 is lifted and a gap is formed between it and the vibrating head 220. The cutting assembly 100 is pulled out from the gap between the pressure plate 251 and the vibrating head 220, and the cutting assembly 100 can be disassembled.
[0068] To facilitate the installation of the cutting component 100, a preferred embodiment is as follows: Figure 9 and Figure 14 As shown, a limiting structure 270 is provided on the vibrating head 220, which fixes the pressure plate 251 to the circumferential position of the vibrating head 220. The limiting structure 270 can be a limiting groove. When installing the cutting assembly 100, the cutting assembly 100 is directly inserted into the limiting groove, and the position of the cutting assembly 100 is limited by the groove wall, thus completing the installation of the cutting assembly 100. The installation process of the cutting assembly 100 is simple. In some other feasible embodiments, the limiting structure 270 can also be a limiting pin provided on the vibrating head 220. When the cutting assembly 100 needs to be installed, the cutting assembly 100 is made to abut against the limiting pin to limit the position of the cutting assembly 100, thus completing the installation of the cutting assembly 100.
[0069] In one embodiment, such as Figure 15As shown, the surgical sagittal saw 200 also includes a control switch 212 and a control module 213. The control switch 212 and the control module 213 are communicatively connected, and both are mounted on the body 210. The control switch 212 controls whether the control module 213 operates, and the control module 213 controls the operation or stop of the cutting assembly 100. The control switch 212 can be a push-button switch or a pneumatic valve. The present invention does not limit the specific type of the control switch 212; it can be configured according to specific requirements.
[0070] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0071] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.
Claims
1. A cutting assembly, characterized in that, include: shell; A swing arm is partially pivotally connected inside the housing, and the swing arm has a cut-out portion at the end extending out of the housing; A linkage assembly is disposed inside the housing. The linkage assembly has a head end and an end end. The linkage assembly includes multiple linkages that are sequentially and movably connected relative to each other. The multiple linkages are arranged sequentially along their length. The linkage at the end of the linkage assembly is connected to the swing rod. The linkage at the head end of the linkage assembly is connected to a vibration component. The vibration component is used to drive the swing motion of the linkage to drive the swing rod to swing. The swing directions of two adjacent links are opposite, and the swing direction of the link at the end of the link assembly is also opposite to the swing direction of the swing rod.
2. The cutting assembly according to claim 1, characterized in that, One of the swing rod and the end is provided with a limiting member, and the other is provided with a guide structure, wherein the limiting member and the guide structure are movable relative to each other; and / or; One of the two adjacent connecting rods is provided with the limiting member, and the other of the two is provided with the guide structure. The limiting member and the guide structure are movable and cooperate with each other.
3. The cutting assembly according to claim 2, characterized in that, The relative movement direction of the limiting member and the guide structure is along the length of the swing rod or the connecting rod.
4. The cutting assembly according to claim 2, characterized in that, The outer shell has an arc-shaped groove; The connecting rod at the first end of the connecting rod assembly is provided with the limiting member, which is movably inserted into the arc-shaped groove.
5. The cutting assembly according to claim 1, characterized in that, The swing rod and the outer casing are pivotally connected together by a first rotating pin. One of the swing rod and the outer casing is provided with the first rotating pin, and the other of the two is provided with a first rotating hole corresponding to the first rotating pin.
6. The cutting assembly according to claim 5, characterized in that, The linkage assembly includes a first linkage located at its head end and one or more second linkages that are movably connected to the first linkage and sequentially movably connected to each other. The second linkage is pivotally connected to the housing via a second rotating pin. One of the second linkage and the housing is provided with a second rotating pin, and the other of the two is provided with a second rotating hole corresponding to the second rotating pin.
7. The cutting assembly according to claim 6, characterized in that, The linkage assembly includes multiple linkages, and adjacent linkages are movable.
8. The cutting assembly according to claim 1, characterized in that, The first end of the connecting rod assembly has a first notch, which is connected to the outside of the housing and is used to connect the vibration assembly.
9. The cutting assembly according to claim 8, characterized in that, The outer casing has a second notch corresponding to the first notch, the connecting rod assembly has a first through hole communicating with the first notch, and the outer casing has a second through hole communicating with the second notch. The first through hole and the second through hole are coaxial and are used to pass through the saw blade clamping assembly.
10. The cutting assembly according to claim 9, characterized in that, The outer casing has at least one positioning hole for the positioning and insertion of the saw blade clamping assembly.
11. A surgical sagittal saw, characterized in that, The device includes a vibrating head, a drive assembly, a vibration assembly, a saw blade clamping assembly, and a cutting assembly as described in any one of claims 1-10. The drive assembly and the vibration assembly are both mounted on the vibrating head. The drive assembly is used to drive the movement of the vibration assembly. The vibration assembly is connected to the first end of the connecting rod assembly. The saw blade clamping assembly is used to fix the cutting assembly to the vibrating head.
12. The surgical sagittal saw according to claim 11, characterized in that, The vibrating head is provided with a limiting structure, which fixes the circumferential position of the pressure plate and the vibrating head.