Implantation fixing device for orthopaedic prosthesis

Abstract

The invention relates to the technical field of orthopedic joint replacement, in particular to an orthopedic prosthesis implantation fixing device which comprises a grab handle, one end of the grab handle is a knocking end, a center shaft is coaxially arranged at the other end of the grab handle, an abutting plate is arranged on the center shaft, and a clamping assembly capable of automatically loosening is further arranged on the center shaft. Compared with a traditional device which needs to manually loosen clamping and replace an independent knocking head for fixing, the device has the advantages that the knocking end of the grab handle is knocked, the clamping assembly automatically and gradually loosens clamping of the knee joint prosthesis, the tedious step of replacing the knocking head is omitted, the operation time is shortened, knocking and fixing are conducted in the clamping state of the clamping assembly, and the operation efficiency is improved. The position of the prosthesis is prevented from being changed when the knocking head is replaced, the mounting position is accurate, and the mounting precision is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of orthopedic joint replacement, and in particular to an implant fixation device for an orthopedic prosthesis. Background Art

[0002] Orthopedic prosthesis implant fixation devices are instruments used to stably fix orthopedic prostheses on human bones. Orthopedic prosthesis implant fixation devices are often used in various joint replacement surgeries.

[0003] For example, Total Knee Arthroplasty (TKA) is a surgical procedure that implants an artificial knee prosthesis to replace a damaged knee joint, relieve pain and restore joint function. Knee replacement is to fix the artificial prosthesis to normal bone using bone cement and screws to replace the normal joint. When the attending physician performs the operation, he will first use osteotomy tools to precisely cut the end bones of the femur and tibia to form a plane suitable for prosthesis installation, and then use the orthopedic prosthesis implant fixation device to clamp the knee prosthesis and fix it on the installation plane.

[0004] However, existing prosthetic implant fixators for knee replacement surgery generally require manual loosening of the clamp during implantation and percussion fixation, and replacement of a separate percussion head for percussion fixation. This method is relatively cumbersome and prolongs the operation time. At the same time, existing prosthetic fixation often directly percusses the bottom of the fixator, transmitting all the impact to the prosthesis and bone, which will inevitably cause a certain degree of damage to the prosthesis or bone, and will have a certain impact on the surgical results. Summary of the Invention

[0005] Based on this, it is necessary to provide an implant fixation device for orthopedic prosthesis to address the problems that current prosthesis implant fixation devices are cumbersome to use and have low efficiency in installing and fixing prostheses.

[0006] The above purpose is achieved through the following technical solutions: An implant fixation device for an orthopedic prosthesis, comprising: A handle, one end of the handle being a striking end, the other end of the handle being coaxially provided with a central axis, an end of the central axis away from the handle being provided with an abutment plate, the abutment plate being used to abut against a knee joint prosthesis; A clamping assembly is capable of clamping the knee joint prosthesis, and the clamping assembly is configured to gradually release the clamping of the knee joint prosthesis when the striking end of the handle is struck.

[0007] Furthermore, the clamping assembly includes two jaws, a rotating plate and a sliding block. The rotating plate is coaxial with the central axis and is rotatably connected. The middle parts of the two jaws are hinged at both ends of the rotating plate. The sliding block slides axially and is sleeved on the central axis. The outer periphery of the sliding block is connected to the two jaws. The sliding block is configured to move along the central axis away from the handle when the knocking end of the handle is knocked.

[0008] Furthermore, a first elastic member is provided between the rotating plate and the sliding block, and the first elastic member causes the sliding block to tend to approach the handle. A second elastic member is provided between the sliding block and the handle, and the second elastic member causes the sliding block to tend to move away from the handle. The stiffness coefficient of the second elastic member is greater than the stiffness coefficient of the first elastic member.

[0009] Furthermore, a first thread is provided on one end of the central shaft connected to the handle, the first thread is spirally connected to the handle, and the abutment plate is axially slidably connected to the rotating plate.

[0010] Furthermore, a second thread is provided on one end where the central shaft is connected to the abutment plate, the second thread is spirally connected to the abutment plate, the thread lead angle of the first thread is greater than the thread lead angle of the second thread, and an elastic top block is provided on the abutment plate, and the elastic top block is made of medical rubber.

[0011] Furthermore, the handle includes a ring sleeve and a gripping portion, the ring sleeve and the gripping portion are axially slidingly connected, the ring sleeve is spirally connected to the first thread, and a clamping plate that slides radially along the ring sleeve is provided on the side wall of the ring sleeve, and the clamping plate is configured to allow the central axis to move when the central axis has a tendency to approach the ring sleeve, and to hinder the central axis from moving when the central axis has a tendency to move away from the ring sleeve.

[0012] Furthermore, a one-way ratchet ring is provided on the central shaft, and a one-way ratchet is provided on the clamping plate, and the one-way ratchet ring is engaged with the one-way ratchet.

[0013] Furthermore, a guide groove extending radially thereof is provided on the side wall of the ring sleeve, a guide rod is fixedly provided on the clamping plate, the guide rod slides in the guide groove, and a reset spring is provided between the guide rod and the guide groove.

[0014] Furthermore, a damper is provided inside the handle, and the damper abuts against the central axis.

[0015] Furthermore, the damper includes a damping telescopic rod, a first damping spring and a second damping spring, the telescopic end of the damping telescopic rod abuts against one end of the central axis located inside the handle, the first damping spring is sleeved on the telescopic end of the damping telescopic rod, and the second damping spring is located between the fixed end of the damping telescopic rod and the inside of the handle.

[0016] The beneficial effects of the present invention are: The present invention is provided with a clamping assembly that can be automatically loosened. Compared with traditional devices that require manual loosening of the clamping and replacement of a separate knocking head for fixation, the present invention automatically and gradually loosens the clamping of the knee joint prosthesis by knocking on the knocking end of the handle, eliminating the tedious steps of replacing the knocking head, shortening the operation time, and performing knocking fixation while the clamping assembly is clamped, avoiding changes in the position of the prosthesis when replacing the knocking head, ensuring accurate installation position, and improving installation accuracy.

[0017] The present invention arranges an elastic top block made of medical rubber material on the abutment plate. During the knocking process, the elastic top block deforms to buffer part of the impact force, reduce the impact directly transmitted to the prosthesis and bone, and reduce the risk of injury.

[0018] The present invention arranges a first thread and a second thread on the central axis, and the thread lead angle of the first thread is greater than the thread lead angle of the second thread, so that the distance the central axis moves toward the handle is greater than the distance the abutment plate moves toward the rotating plate. As the number of knocks increases, the deformation of the elastic top block gradually recovers, and the impact force of subsequent knocks gradually decreases, adapting to the process of gradual fixation of the prosthesis and making the installation more reasonable.

[0019] The present invention provides a damper, which includes a damping telescopic rod, a first damping spring and a second damping spring. The impact generated by the knocking is transmitted to the prosthesis after multiple buffering, reducing the impact difference of each knock, making the impact force more uniform, and further reducing damage to the prosthesis and bone. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic structural diagram of an implant fixation device for an orthopedic prosthesis provided in one embodiment of the present invention; Figure 2 for Figure 1 A front view of an implant fixation device for an orthopedic prosthesis provided in one embodiment; Figure 3 for Figure 2 A cross-sectional view of an implant fixation device for an orthopedic prosthesis provided in one embodiment along line AA; Figure 4 for Figure 3 A partial enlarged view of a portion X of an implant fixation device for an orthopedic prosthesis provided in one embodiment; Figure 5 forFigure 3 Partially enlarged view of the implantation fixing device Y of the orthopedic prosthesis according to an embodiment; Figure 6 For Figure 2 Sectional view of the implantation fixing device of the orthopedic prosthesis along B-B according to an embodiment; Figure 7 Sectional view of the implantation fixing device of the orthopedic prosthesis according to an embodiment; Figure 8 Exploded view of the implantation fixing device of the orthopedic prosthesis according to an embodiment; Figure 9 Schematic view of the loop structure of the implantation fixing device of the orthopedic prosthesis according to an embodiment; Figure 10 For Figure 9 Sectional view of the loop of the implantation fixing device of the orthopedic prosthesis along C-C according to an embodiment.

[0021] Wherein: 100, handle; 101, knocking end; 102, gripping part; 110, loop; 120, limiting groove; 130, clamping plate; 140, guide rod; 150, guide groove; 160, reset spring; 170, button; 200, central shaft; 201, first thread; 202, second thread; 203, one-way ratchet ring; 210, abutting plate; 211, connecting block; 212, rectangular through slot; 220, elastic top block; 240, rotating plate; 241, rectangular block; 242, clasp; 243, fixed block; 250, sliding block; 251, first connecting arm; 260, clamping jaw; 261, clamping end; 262, second connecting arm; 270, first elastic member; 280, second elastic member; 300, damper; 310, first damping spring; 320, second damping spring; 330, damping telescopic rod. DETAILED DESCRIPTION

[0022] In order to make the objects, technical solutions and advantages of the present application clearer, further detailed description will be made to the present application by means of embodiments and in conjunction with the drawings. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0023] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings). In the description of the present invention, it should be understood that terms such as "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the device or component being referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0024] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0025] Refer to the following Figures 1-10 The following describes an implant fixation device for an orthopedic prosthesis provided by the present invention.

[0026] An implant fixation device for an orthopedic prosthesis is suitable for implant fixation of a knee joint prosthesis, comprising a handle 100, one end of the handle 100 being a striking end 101, the other end of the handle 100 being coaxially connected to a central shaft 200, an end of the central shaft 200 away from the handle 100 being provided with an abutment plate 210, the abutment plate 210 being capable of abutting a knee joint prosthesis (not shown in the figure), and a clamping assembly being provided on the central shaft 200, the clamping assembly being used to clamp the knee joint prosthesis and abut the knee joint prosthesis against the abutment plate 210 to make the clamping more stable. The knee prosthesis implant fixator in joint replacement surgery generally needs to clamp the knee prosthesis to the designated installation position during implantation. After the knee prosthesis is initially fitted in the designated installation position, the clamping of the knee prosthesis is released, and a separate striking head is replaced for striking and fixing, thereby tightly fixing the knee prosthesis in the designated installation position. However, when replacing the striking head, the clamping component disengages from the clamping of the knee prosthesis, which may cause the position of the knee prosthesis to change. At the same time, replacing the striking head during surgery makes the installation of the knee prosthesis less efficient, which will result in prolonged surgery time.

[0027] Based on this, in order to improve the installation efficiency of the knee joint prosthesis and reduce the operation time, the present invention configures the clamping assembly to gradually loosen the clamping of the knee joint prosthesis when the doctor knocks the knocking end 101 of the handle 100, and the loosening is slow. As the number of knocks increases, the connection strength between the knee joint prosthesis and the designated installation position increases, and the degree to which the clamping assembly disengages from the clamping of the knee joint prosthesis also increases. When the knee joint prosthesis is almost tightly fixed in the designated installation position, the clamping assembly completely loosens the clamping of the knee joint prosthesis.

[0028] It can be understood that the prosthesis implant fixator in the present invention does not need to disassemble the clamping assembly to replace the knocking head when knocking, but directly knocks the knocking end 101 of the handle 100, and during the knocking process, the clamping assembly will automatically loosen the knee joint prosthesis, thereby eliminating the tedious steps of replacing the knocking head, improving the installation efficiency of the knee joint prosthesis, and knocking and fixing under the clamping action of the clamping assembly can avoid the influence of the connection position of the knee joint prosthesis when replacing the knocking head, so that the installation position of the knee joint prosthesis does not change, thereby improving the installation accuracy of the knee joint.

[0029] Specifically, such as Figure 1 and Figure 2 As shown, the clamping assembly in the embodiment of the present invention includes two clamping jaws 260, a rotating plate 240 and a sliding block 250. The rotating plate 240 is coaxial and rotatably connected to the outer periphery of the central axis 200. The two ends of the rotating plate 240 are respectively hinged to the middle parts of the two clamping jaws 260. The clamping ends 261 of the two clamping jaws 260 can move closer to or away from each other around the hinge position, thereby clamping or releasing the knee joint prosthesis. The sliding block 250 slides axially and is sleeved on the outer periphery of the central axis 200. The outer periphery of the sliding block 250 is fixedly connected to the first connecting arm 251, and the middle parts of the two clamping jaws 260 are fixedly provided with a second connecting arm 262. The first connecting arm 251 is hinged to the second connecting arm 262. When the sliding block 250 moves along the central axis When the sliding block 250 slides axially, it can drive the clamping ends 261 of the two clamping jaws 260 to move closer to or away from each other through the first connecting arm 251 and the second connecting arm 262. It should be noted that, in this embodiment, the sliding block 250 is set to drive the clamping ends 261 of the two clamping jaws 260 away from each other when the sliding block 250 moves away from the handle 100 along the central axis 200. Therefore, when the sliding block 250 approaches the handle 100 along the central axis 200, it drives the clamping ends 261 of the two clamping jaws 260 to move closer to each other, and when the doctor knocks the knocking end 101 of the handle 100, the sliding block 250 will move away from the handle 100 along the central axis 200, thereby causing the sliding block 250 to drive the clamping ends 261 of the two clamping jaws 260 away from each other to loosen the clamping of the knee joint prosthesis.

[0030] like Figure 3 and Figure 4As shown, in order to facilitate the rotation connection of the rotating plate 240 on the central shaft 200, a rotating hole is opened at the center position of the rotating plate 240, the central shaft 200 passes through the rotating hole, and a retaining ring 242 is coaxially and fixedly arranged on the central shaft 200, and the upper end face of the retaining ring 242 is in sliding contact with the lower end face of the rotating plate 240. A fixed block 243 is also provided on the central shaft 200, and the lower end face of the fixed block 243 is in sliding contact with the upper end face of the rotating plate 240. The fixed block 243 and the retaining ring 242 limit the axial movement of the rotating plate 240 on the central shaft 200, but do not limit the rotation of the rotating plate 240 around the axis of the central shaft 200.

[0031] More specifically, Figure 1 and Figure 2 As shown, in order to realize the function of making the sliding block 250 move away from the handle 100 when the doctor knocks the knocking end 101 of the handle 100, a first elastic member 270 is provided between the rotating plate 240 and the sliding block 250 in this embodiment. The first elastic member 270 is a compression spring. The first elastic member 270 makes the sliding block 250 have a tendency to approach the handle 100, and a second elastic member 280 is provided between the sliding block 250 and the handle 100. The second elastic member 280 is also a compression spring. The second elastic member 280 makes the sliding block 250 have a tendency to move away from the handle 100. The stiffness coefficient of the second elastic member 280 is greater than that of the first elastic member 2 The stiffness coefficient is 70, the first elastic member 270 and the second elastic member 280 are both in a compressed state, and the clamping ends 261 of the two jaws 260 are close to each other when the knee joint prosthesis is not clamped in the initial state. When the doctor needs to clamp the knee joint prosthesis, the doctor moves the clamping ends 261 of the two jaws 260 away from each other. At this time, the sliding block 250 is away from the handle 100, thereby further compressing the first elastic member 270. When the clamping ends 261 of the jaws 260 clamp the knee joint prosthesis, the first elastic member 270 pushes the sliding block 250 close to the handle 100, so that the clamping ends 261 of the jaws 260 tightly clamp the knee joint prosthesis.

[0032] It should be noted that when the doctor strikes the striking end 101 of the handle 100, since the abutment plate 210 at one end of the central axis 200 abuts against the knee joint prosthesis, the central axis 200 will move axially relative to the handle 100 during the striking, and the central axis 200 will move toward the direction close to the handle 100. When the central axis 200 moves toward the handle 100, the distance between the rotating plate 240 and the handle 100 is shortened, thereby compressing the first elastic member 270 and the second elastic member 280. The spring coefficient of the second elastic member 280 is greater than the spring coefficient of the first elastic member 270, so the second elastic member 280 will push the sliding block 250 along the central axis 200 to approach the rotating plate 240, and the sliding block 250 drives the clamping ends 261 of the two clamping jaws 260 to move away from each other, thereby gradually loosening the knee joint prosthesis. As the central axis 200 moves farther toward the handle 100, the sliding block 250 drives the clamping ends 261 of the two clamping jaws 260 to move away from each other.

[0033] In a further embodiment, in order to ensure that the central shaft 200 can move a short distance toward the handle 100 when the doctor knocks on the knocking end 101 of the handle 100, the present invention is provided with a first thread 201 on one end of the central shaft 200, and the first thread 201 is spirally connected to the handle 100. When the doctor knocks on the knocking end 101 of the handle 100, the central shaft 200 is subjected to an impact force in the axial direction, and the central shaft 200 is spirally connected to the handle 100, and the spirally connected thread has a large lead angle, so that the first thread 201 connected to the outer periphery of the central shaft 200 will rotate relative to the handle 100. With each knock, the first thread 201 on the outer periphery of the central shaft 200 rotates a little relative to the handle 100, so that the central shaft 200 can move a short distance toward the handle 100, and the second elastic member 280 is gradually compressed, thereby pushing the sliding block 250.

[0034] Specifically, such as Figure 8 As shown, the abutment plate 210 in this embodiment is axially slidingly connected to the rotating plate 240, and a rectangular block 241 is provided on one end of the rotating plate 240 close to the abutment plate 210, and a connecting block 211 is fixedly provided on one end of the abutment plate 210 close to the rotating plate 240, and a rectangular through groove 212 is provided on the connecting block 211, so that the abutment plate 210 is axially slidingly connected to the rotating plate 240, and a second thread 202 is provided on the other end of the central shaft 200, and the second thread 202 is spirally connected to the abutment plate 210. When the doctor knocks on the knocking end 101 of the handle 100 to rotate the central shaft 200, the second thread 202 will also rotate relative to the abutment plate 210, so that the abutment plate 210 can move in the direction close to the rotating plate 240.

[0035] It should be noted that, in the embodiment of the present invention, the thread lead angle of the first thread 201 is greater than the thread lead angle of the second thread 202, so that when the central shaft 200 is subjected to impact force, the first thread 201 can drive the central shaft 200 to rotate around its own axis, and the abutment plate 210 can move toward the direction close to the rotating plate 240. In this embodiment, an elastic top block 220 is provided on the abutment plate 210. The elastic top block 220 is made of medical rubber. The elastic top block 220 contacts the knee joint prosthesis. When the clamping ends 261 of the two jaws 260 clamp the knee joint prosthesis, the elastic top block 220 abuts against the knee joint prosthesis and deforms. When the doctor knocks on the handle 100, the force is transmitted to the knee joint prosthesis through the central shaft 200, the abutment plate 210 and the elastic top block 220, so that the knee joint prosthesis can be gradually fixed in the designated installation position.

[0036] It can be understood that since the central axis 200 is spirally connected to the abutment plate 210 through the second thread 202, when the doctor knocks on the handle 100 to rotate the central axis 200 around its own axis, the abutment plate 210 will move away from the knee joint prosthesis. At this time, the elastic top block 220 on the abutment plate 210 will recover a little deformation. As the number of knocks increases, the knee joint prosthesis is gradually positioned in the designated installation position, so the subsequent knocking force needs to be gradually reduced. Therefore, as the number of knocks increases, the number of rotations of the central axis 200 increases synchronously, so that the distance between the abutment plate 210 and the knee joint prosthesis increases, and the degree of deformation of the elastic top block 220 on the abutment plate 210 gradually decreases, so that during subsequent knocks, the force of the elastic top block 220 on the knee joint prosthesis gradually decreases.

[0037] In a further embodiment, the handle 100 of the present invention includes a ring sleeve 110 and a grip portion 102, and the ring sleeve 110 and the grip portion 102 are axially slidingly connected. A plurality of limiting grooves 120 extending axially along the ring sleeve 110 are provided on the outer periphery of the connection portion between the ring sleeve 110 and the grip portion 102, and a limiting strip (not shown in the figure) extending axially along the grip portion 102 is provided inside the grip portion 102. When the ring sleeve 110 is connected to the grip portion 102, the limiting strip on the outer periphery of the ring sleeve 110 is located in the limiting groove 120 inside the grip portion 102, thereby limiting the rotation of the ring sleeve 110 relative to the grip portion 102.

[0038] It should be noted that if Figure 7 and 10As shown, the first thread 201 on the central shaft 200 in this embodiment is spirally connected to the ring sleeve 110, and a spiral groove cooperating with the first thread 201 is opened on the inner circumference of the ring sleeve 110, and both ends of the spiral groove are blocked. The first thread 201 is located in the spiral groove. Before the handle 100 is struck, the first thread 201 of the central shaft 200 is located at the top of the spiral groove, that is, the first thread 201 is located on the end of the spiral groove closest to the sliding block 250. When the handle 100 is struck, the central shaft 200 can be moved toward the direction close to the ring sleeve 110, that is, the first thread 201 moves downward from the top of the spiral groove, and the downward movement drives the central shaft 200 to rotate. The rotation of the central shaft 200 drives the abutment plate 210 to move toward the rotating plate 240 to gradually reduce the deformation degree of the elastic top block 220.

[0039] Specifically, such as Figure 2 and Figure 6 As shown, in order to prevent the two clamping jaws 260 from resetting during the knocking process, a clamping plate 130 is provided on the side wall of the ring sleeve 110. The clamping plate 130 can move radially along the side wall of the ring sleeve 110. The clamping plate 130 is configured to allow the central shaft 200 to move when the central shaft 200 has a tendency to approach the ring sleeve 110, and to hinder the central shaft 200 from moving when the central shaft 200 has a tendency to move away from the ring sleeve 110, thereby preventing the sliding block 250 from driving the clamping ends 261 of the two clamping jaws 260 on the central shaft 200 to approach each other.

[0040] More specifically, Figure 3 、 Figure 5 and Figure 6 As shown, in order to achieve the above functions, the present invention provides a one-way ratchet ring 203 at the portion of the central shaft 200 located in the ring sleeve 110. The one-way ratchet ring 203 has multiple layers, and the card plate 130 is provided with a one-way ratchet tooth. The one-way ratchet tooth engages with the one-way ratchet ring 203. The one-way ratchet tooth on the card plate 130 only allows the central shaft 200 to approach the ring sleeve 110, that is, only allows Figure 5 The central axis 200 moves downward, and a guide groove 150 extending radially along the side wall of the ring sleeve 110 in this embodiment is opened. A guide rod 140 is fixedly set on the card plate 130, and the guide rod 140 is slidably inserted in the guide groove 150, and a reset spring 160 is set on the outer periphery of the guide rod 140. The reset spring 160 pushes the one-way ratchet on the card plate 130 to engage with the one-way ratchet ring 203. At the same time, a part of the card plate 130 extends out of the side wall of the ring sleeve 110, and this part is named button 170. When the central axis 200 needs to be reset, the doctor presses the button 170 to release the engagement of the one-way ratchet on the card plate 130 and the one-way ratchet ring 203.

[0041] It is understandable that existing prosthesis fixators often directly hit the bottom of the fixator, transmitting all the impact to the prosthesis and bone, which will inevitably cause a certain degree of damage to the prosthesis or bone and have a certain impact on the surgical results.

[0042] Based on this, a damper 300 is provided inside the handle 100 of the present invention, that is, the gripping part 102 of the handle 100 is installed with the damper 300, and one end of the damper 300 abuts the central axis 200. The damper 300 is used to cushion the impact generated by the knocking, and then release the impact force through the damper 300 to transmit it to the central axis 200, the abutment plate 210 and the elastic top block 220, and finally act on the knee joint prosthesis through the elastic top block 220, thereby avoiding a certain degree of damage to the prosthesis or bone.

[0043] Specifically, such as Figure 3 and Figure 5 As shown, the damper 300 in this embodiment includes a damping telescopic rod 330, a first damping spring 310 and a second damping spring 320. The telescopic end of the damping telescopic rod 330 abuts against the central axis 200. The first damping spring 310 is sleeved on the telescopic end of the damping telescopic rod 330, so that the telescopic end of the damping telescopic rod 330 has an elastic telescopic function. The second damping spring 320 is located between the fixed end of the damping telescopic rod 330 and the inside of the handle 100. When the doctor knocks on the knocking end 101 of the handle 100, the impact generated by the knocking is transmitted from the knocking end 101 of the handle 100. The striking end 101 is transmitted to the second damping spring 320, the second damping spring 320 transmits the impact to the damping telescopic rod 330, the damping telescopic rod 330 transmits the impact to the first damping spring 310, and finally transmitted to the central shaft 200 through the telescopic end of the damping telescopic rod 330, so that the impact transmitted to the central shaft 200 is buffered multiple times. Although the force of the doctor's knocking cannot be guaranteed to be exactly the same each time, the setting of the damper 300 can reduce the difference in impact generated during each knock, so that the impact force transmitted to the central shaft 200 is as similar as possible.

[0044] It should be noted that the damper 300 in the present invention is not limited to the above structure, and can also be other dampers 300 that can buffer the impact force generated by knocking, and no specific limitation is made here.

[0045] The specific working process of the implant fixation device for orthopedic prosthesis provided by the present invention is described in combination with the above embodiments: Installing a knee prosthesis: The doctor rotates the gripping portion 102 forward, and the gripping portion 102 drives the ring 110 to rotate forward synchronously. Since the thread lead angle of the first thread 201 on the central shaft 200 is greater than the thread lead angle of the second thread 202, and the thread lead angle of the first thread 201 is larger, when the ring 110 rotates, the first thread 201 of the central shaft 200 is subjected to the circumferential force and rotates around its own axis. The abutment plate 210 moves toward the direction of the rotating plate 240 through the second thread 202. At this time, the doctor By moving the clamping ends 261 of the two clamping jaws 260 away from each other and clamping the knee joint prosthesis with the two clamping jaws 260, the doctor rotates the gripping portion 102 in the opposite direction, and the gripping portion 102 drives the ring sleeve 110 to rotate in the opposite direction synchronously. The abutment plate 210 moves toward the direction close to the knee joint prosthesis through the second thread 202, causing the elastic top block 220 to deform, thereby increasing the force of the clamping jaws 260 to clamp the knee joint prosthesis. After clamping, the doctor drives the knee joint prosthesis toward the designated installation position through the gripping portion 102.

[0046] Tap Fixation: After the doctor fits the knee joint prosthesis in the designated installation position, he knocks on the knocking end 101 of the handle 100. The vibration generated by the knocking is transmitted to the central shaft 200 after being buffered by the damper 300, and then transmitted to the abutment plate 210 and the elastic top block 220 through the central shaft 200 to the knee joint prosthesis, so that the knee joint prosthesis is gradually fixed in the designated installation position.

[0047] The clamping jaws 260 gradually release their grip on the knee prosthesis: Since the thread lead angle of the first thread 201 on the central shaft 200 is greater than the thread lead angle of the second thread 202, when the central shaft 200 is subjected to an axial impact force, the central shaft 200 is more likely to rotate under the action of the first thread 201, so the central shaft 200 can rotate around its own axis. When the central shaft 200 rotates around its own axis, it can simultaneously move toward the direction close to the ring sleeve 110. At this time, the distance between the rotating plate 240 and the ring sleeve 110 is shortened, and the first elastic member 270 and the second elastic member 280 will be compressed. Since the spring coefficient of the second elastic member 280 is greater than that of the first elastic member 270, The spring element 280 pushes the sliding block 250 toward the rotating plate 240, and the sliding block 250 drives the clamping ends 261 of the two clamping jaws 260 to move away from each other, so that the two clamping jaws 260 gradually separate from the knee joint prosthesis. As the number of knocks increases, the sliding block 250 moves farther toward the rotating plate 240, and the clamping jaws 260 separate more from the knee joint prosthesis. In addition, the central axis 200 is prevented from moving in a direction away from the annulus 110 under the action of the clamping plate 130, the return spring 160, the one-way ratchet and the one-way ratchet ring 203 on the side wall of the annulus 110.

[0048] Meanwhile, the rotation of the center shaft 200 can also move the second screw 202 axially relative to the abutment plate 210, and the abutment plate 210 will move towards the rotating plate 240 during the knocking, but the moving distance is smaller than the moving distance of the center shaft 200 towards the ring sleeve 110, and as the number of knocking increases, the knee joint prosthesis is gradually fixed at the specified installation position, so the impact force required subsequently gradually decreases, and the moving distance of the center shaft 200 towards the ring sleeve 110 and the moving distance of the abutment plate 210 towards the rotating plate 240 make the deformation of the elastic top block 220 gradually recover, and the buffering effect of the elastic top block 220 gradually increases, and then the impact force of the subsequent knocking gradually decreases, so as to adapt to the gradually fixed knee joint prosthesis installation.

[0049] After installation: When the elastic top block 220 completely recovers the deformation, the clamping jaw 260 has also been disengaged from the clamping of the knee joint prosthesis, and the fixed installation of the knee joint prosthesis has been completed, at this time, the doctor presses the button 170, so that the one-way ratchet on the clamping plate 130 is disengaged from the engagement with the one-way ratchet ring 203, so that the center shaft 200 is reset under the action of the first elastic member 270 and the second elastic member 280, and is prepared for the next use.

[0050] The technical features of the above embodiments can be combined arbitrarily, and in order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0051] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. An implant fixation device for an orthopedic prosthesis, characterized in that: include: A handle, one end of the handle being a striking end, the other end of the handle being coaxially provided with a central axis, an end of the central axis away from the handle being provided with an abutment plate, the abutment plate being used to abut against a knee joint prosthesis; A clamping assembly is capable of clamping the knee joint prosthesis, and the clamping assembly is configured to gradually release the clamping of the knee joint prosthesis when the striking end of the handle is struck.

2. The implant fixation device for orthopedic prosthesis according to claim 1, characterized in that: The clamping assembly includes two jaws, a rotating plate and a sliding block. The rotating plate is coaxial with the central axis and is rotatably connected. The middle parts of the two jaws are hinged at both ends of the rotating plate. The sliding block slides axially and is sleeved on the central axis. The outer periphery of the sliding block is connected to the two jaws. The sliding block is configured to move along the central axis away from the handle when the knocking end of the handle is knocked.

3. The implant fixation device for orthopedic prosthesis according to claim 2, characterized in that: A first elastic member is provided between the rotating plate and the sliding block, and the first elastic member causes the sliding block to tend to approach the handle. A second elastic member is provided between the sliding block and the handle, and the second elastic member causes the sliding block to tend to move away from the handle. The stiffness coefficient of the second elastic member is greater than the stiffness coefficient of the first elastic member.

4. The implant fixation device for orthopedic prosthesis according to claim 2, characterized in that: A first thread is provided on one end of the central shaft connected to the handle, the first thread is spirally connected to the handle, and the abutting plate is axially slidably connected to the rotating plate.

5. The implant fixation device for orthopedic prosthesis according to claim 4, characterized in that: A second thread is provided on one end of the central shaft connected to the abutment plate, the second thread is spirally connected to the abutment plate, the thread lead angle of the first thread is greater than the thread lead angle of the second thread, and an elastic top block is provided on the abutment plate, and the elastic top block is made of medical rubber.

6. The implant fixation device for orthopedic prosthesis according to claim 4, characterized in that: The handle includes a ring sleeve and a gripping portion, the ring sleeve and the gripping portion are axially slidingly connected, the ring sleeve is spirally connected to the first thread, and a clamping plate that slides radially along the ring sleeve is provided on the side wall of the ring sleeve, and the clamping plate is configured to allow the central axis to move when the central axis has a tendency to approach the ring sleeve, and to hinder the central axis from moving when the central axis has a tendency to move away from the ring sleeve.

7. The implant fixation device for orthopedic prosthesis according to claim 6, characterized in that: A one-way ratchet ring is provided on the central shaft, and a one-way ratchet is provided on the clamping plate. The one-way ratchet ring is engaged with the one-way ratchet.

8. The implant fixation device for orthopedic prosthesis according to claim 6, characterized in that: A guide groove extending radially thereof is provided on the side wall of the ring sleeve, a guide rod is fixedly provided on the clamping plate, the guide rod is slidably located in the guide groove, and a return spring is provided between the guide rod and the guide groove.

9. The implant fixation device for orthopedic prosthesis according to claim 1, characterized in that: A damper is provided inside the handle, and the damper abuts against the central axis.

10. The implant fixation device for orthopedic prosthesis according to claim 9, characterized in that: The damper includes a damping telescopic rod, a first damping spring and a second damping spring. The telescopic end of the damping telescopic rod abuts against one end of the central axis located inside the handle. The first damping spring is sleeved on the telescopic end of the damping telescopic rod. The second damping spring is located between the fixed end of the damping telescopic rod and the inside of the handle.

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