WO2011044852A1 - Locking device for anterior cervical steel plate - Google Patents

Locking device for anterior cervical steel plate Download PDF

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Publication number
WO2011044852A1
WO2011044852A1 PCT/CN2010/077776 CN2010077776W WO2011044852A1 WO 2011044852 A1 WO2011044852 A1 WO 2011044852A1 CN 2010077776 W CN2010077776 W CN 2010077776W WO 2011044852 A1 WO2011044852 A1 WO 2011044852A1
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WO
WIPO (PCT)
Prior art keywords
locking
screw
steel plate
locking device
piece
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Application number
PCT/CN2010/077776
Other languages
French (fr)
Chinese (zh)
Inventor
吕振杰
黎洁
温潇溢
刘道志
Original Assignee
上海微创骨科医疗科技有限公司
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Application filed by 上海微创骨科医疗科技有限公司 filed Critical 上海微创骨科医疗科技有限公司
Publication of WO2011044852A1 publication Critical patent/WO2011044852A1/en

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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/80Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
    • A61B17/8033Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates having indirect contact with screw heads, or having contact with screw heads maintained with the aid of additional components, e.g. nuts, wedges or head covers
    • A61B17/8042Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates having indirect contact with screw heads, or having contact with screw heads maintained with the aid of additional components, e.g. nuts, wedges or head covers the additional component being a cover over the screw head

Definitions

  • the invention relates to a Chinese patent granted by the Chinese Patent Office on October 16, 2009, the application number is 200910197332.2, and the invention name is "a locking device for a neck pusher steel plate". Priority of the application, the entire contents of which are incorporated herein by reference. Technical field
  • This invention relates to an orthopaedic implant widely used in surgical orthopedic devices, a locking device for a anterior cervical plate, and more particularly to an anti-off device for locking a bone plate screw relative to a bone plate. Background technique
  • Bohler reported the first case of a neck-push anterior plate screw applied to a lower neck thrust fracture.
  • the early anterior cervical plate system does not have an anti-off device. Due to the special physiological structure and frequent activities of the human spine, the joint between the steel plate and the screw is prone to loosening. To achieve strong fixation, the screw at the end of the screw must penetrate. Pushing the cortical bone behind the body increases the difficulty of surgery and increases the potential risk of spinal cord injury.
  • the neck push-locked steel plate was studied. The steel plate and the screw were firmly combined by fixing the tip end of the screw, and the screw end of the screw did not need to penetrate the cortical bone behind the pusher to achieve the fixation effect.
  • the locking anterior plate of the neck pushes the tube greatly, which increases the safety of the operation and reduces complications.
  • the lockable neck pusher steel plate has been developed to date, and its anti-offset device has evolved into various types, the purpose of which is to provide a safer and more reliable locking for the screw, as well as a more convenient operation.
  • various types of anti-off devices also have their own shortcomings.
  • the Zerphir ( Sofamor) steel plate is prevented from being locked by pushing the locking piece in place by pressing the screw head at the top of the paddle.
  • this structure can realize the locking of two screws at a time, and the system has a low notch, there are defects such as difficulty in withdrawing the anti-off device during system rebuilding, requiring high surgical skills and prolonged operation time.
  • Slim-loc is a "Cam-Loc" cam locking mechanism that uses an eccentric cam side pressure screw head to prevent it. Although the operation is simpler and the locking force is larger, the locking cam is easy to slide, and the locking fails when the rotation is 270°.
  • the Vectra (Synthes) anti-offset device is an "Elgiloy clip” that is snapped into the EJ slot of the screw head by a clip to block the escape of the screw. However, the clip structure is relatively thin, and the clip is easily damaged by repeated repairs.
  • Trinica Zimmer
  • Trinica is a detachment prevention method using a top press, and the anti-off device rotates, so that three screws can be locked at a time.
  • this anti-off device has a high notch, which is easy to cause bad stimulation to the esophagus, causing discomfort to the patient, and because the space occupied by the anti-off device is large, the possibility of designing the plate bone window is almost zero. Summary of the invention
  • the present invention proposes a novel locking device for a neck-pushing front steel plate, which not only can achieve fast locking and release of the bone plate screw, but also has a notch Low, which is conducive to the treatment and recovery of patients.
  • the locking device of the present invention includes at least one screw and a retaining device, wherein the screw is fitted in at least one screw hole provided on the steel plate, and the mounting hole is disposed on the steel plate near the screw hole.
  • the detachment prevention device is disposed in the fitting groove, and includes first and second members that cooperate with each other, and the first member can urge the second member to reciprocate along the fitting groove such that a portion of the second member is located Above the top surface of the screw to prevent the screw from exiting, or removing from the top of the screw facilitates assembly of the screw.
  • the first member of the detachment prevention device is a lock pin connected to the steel plate
  • the second member is a lock piece that moves in the assembled EJ groove.
  • one end of the locking pin forms a pushing portion, which can convert its own rotary motion into a linear motion of the locking piece
  • the other end of the locking pin forms a mounting portion
  • the mounting portion is inserted into the steel plate. Inside the hole and can rotate in it.
  • the coordinated movement of the locking pin and the locking tab is not limited in this way. For example, it is also possible to push the lock pin movement in a straight line and drive the linear motion of the integrally connected lock piece.
  • the pushing portion is formed as an eccentric structure, such as a cam structure, which is inserted into a hole provided in the locking piece and pushes against the inner side of the hole of the locking piece when the locking pin is rotated to push The lock piece moves.
  • the locking piece includes first and second locking pieces that are symmetric in shape, the locking pin is located between the two locking pieces, and the pushing portion is formed in an elliptical structure, when the locking pin is rotated, The elliptical structure pushes against the sides of the two locking pieces to push the locking piece to move.
  • the locking piece can be connected to the steel plate by the connection of the locking pin and the locking piece.
  • This connection is particularly advantageous in the case of using one or two screws, and may have Effectively reduce the size of the entire locking device.
  • the locking tab requires an additional connection.
  • a card edge is respectively disposed on the first and second locking pieces, and a corresponding mounting portion on the mounting groove is provided with a card slot, and the card edge can reciprocate in the card slot.
  • the locking device can be adapted to more than two screws, in particular for simultaneously locking four screws.
  • a positioning protrusion may be respectively disposed on the bottom surface of the first and second locking pieces mounted in the fitting groove, and the surface of the fitting groove is correspondingly disposed. Positioning the recessed holes.
  • the top end of the locking piece extends outwardly in parallel to form at least one boss.
  • the boss is located above the at least one screw hole, and the bottom of the locking piece is retained in the mounting groove. Inside, such that a space is left between the bottom surface of the boss and the top surface of the assembled screw.
  • the screw can achieve a certain range of swing in the space, which is advantageous in that the joint portion of the steel plate and the screw head is uniformly biased.
  • the anterior cervical internal fixation bone resorption occurs during fusion of the bone graft, so the height of the push is reduced, and the swing of the screw within the predetermined range can reduce the gap due to bone absorption. Further, the pressurization effect on the bone graft is prevented, and the non-healing of the bone graft due to the stress shielding is prevented, and the healing of the bone graft is promoted.
  • the shape of the boss corresponds to the shape of the threaded hole.
  • the boss when the retaining device is in the unlocked state, the boss can be formed as a part of the threaded hole, and the size of the locking piece and the size of the entire locking device can be correspondingly reduced.
  • the bottom of the lock pin i.e., the mounting portion, can penetrate the hole in the steel plate to facilitate the connection of the lock pin to the steel plate.
  • the locking pin and the steel plate may be connected by riveting, screwing or using a circlip at the bottom of the locking pin.
  • the locking piece is shielded from the screw head in the locking device, at least one screw can be locked at a time, and the entire locking device has a low notch.
  • the rotary propulsion/exit mode is adopted to convert the rotary motion of the lock pin into the linear motion of the lock piece, so that the rotation track of the lock pin is shorter, which not only provides safe and reliable anti-off protection for the screw, but also operates the tube. Save effort and reduce the difficulty of surgery.
  • the screws can also achieve yaw within a certain angle range.
  • the steel plate can be provided with a larger bone grafting window, which is convenient for the doctor to observe the bone graft during the operation. Status. DRAWINGS
  • FIG. 1a and 1b are schematic views showing the anti-offset device in an unlocked state in a locking device according to an embodiment of the present invention, wherein FIG. 1a is a plan view, and FIG. 1b is a perspective view, in which a part of the steel plate is cut away to clearly show The structure of the locking piece and the screw;
  • FIG. 2a and 2b show a schematic view of the anti-drop device in a locked state
  • Fig. 2a is a plan view
  • Fig. 2b is a perspective view, in which a part of the steel plate is cut away to clearly show the structure of the locking piece and the screw; a perspective view of the steel sheet;
  • Figure 4 is a perspective view of the screw
  • Figure 5 is a perspective view of the locking piece
  • Figure 6 is a perspective view of the lock pin
  • Figure 7 is a cross-sectional view of the locking device, showing the positional relationship between the boss of the locking piece and the top surface of the screw, and the sectional structure of the locking pin and the locking piece;
  • Figure 10 is a schematic view showing a locking device according to another embodiment of the present invention, in which case the anti-off device is in an unlocked state;
  • Figure 11 is a schematic view showing the anti-drop device shown in Figure 10 in a locked state
  • Figure 12 is a schematic view of a steel plate in the locking device of Figure 10;
  • Figure 13 is a schematic view of one of the locking pieces in the locking device of Figure 10;
  • Figure 14 is a schematic view of the locking piece viewed from another angle
  • Figure 15 is a schematic view of the locking pin of the locking device of Figure 10;
  • Figure 16 is a cross-sectional view of the locking device of Figure 11 in a locked state
  • Figure 17 is a schematic view showing the operation of resetting the locking device of Figure 11 to an unlocked state.
  • the locking device of the present invention will be described in detail below by way of specific embodiments to better understand the structure, function and effect of the locking device, particularly its anti-off device. Where the same reference numerals identify the same or similar components.
  • the locking device for the steel sheet 1 includes at least one screw 2 and a retaining device that prevents the screw 2 from being withdrawn.
  • the screw 2 is mounted in at least one screw hole 11 provided on the steel plate 1 and can be inserted into the neck pusher body, and the mounting groove 12 is disposed on the steel plate 1 near the screw hole 11, and the anti-off device Placeable therein and reciprocally movable along the assembly W-slot 12, the anti-drop device can include first and second members, wherein the first member can push the second member to effect reciprocal movement along the fitting groove and cause the second Part of the part is located in the screw
  • the top of the top surface of the 2 prevents the screw from exiting, or the removal from the top of the screw 2 facilitates the assembly of the screw.
  • the shape of the fitting recess 12 can be matched with the shape of the second member, so that the locking device after the anti-drop device is installed has a low notch and does not protrude from the surface of the steel sheet to prevent the patient from being uncomfortable.
  • the first component is a locking pin 4 and the second component is a locking tab 3.
  • the locking pin 4 connects the locking tab 3 to the steel plate 1.
  • the shape of the locking piece 3 exactly matches the shape of the fitting groove 12.
  • two screws 2 are taken as an example, and the steel plate 1 is provided with two screw holes 11 correspondingly.
  • the mounting groove 12 and the corresponding position of the locking piece 3 are disposed between the two screw holes to achieve simultaneous locking and release of the two screws.
  • the size of the locking piece can be changed according to actual needs, such as narrowing its width to lock only one screw, or changing its shape to lock more screws.
  • Figures la and lb show the state in which the detachment prevention device is not locked, and at this time, the lock piece 3 is located on one side of the fitting recess 12, exposing the complete screw hole 11, and the screw 2 can freely enter and exit the steel plate 1.
  • Figures 2a and 2b show the state in which the retaining device has been locked, at which point the locking tab 3 is moved towards the other side of the fitting recess 12 and partially over the top surface of the assembled screw 2, preventing it. The exit of the screw 2.
  • Figures 3 through 6 show the construction of the various components of the locking device, respectively.
  • Figure 3 clearly shows the structure of the screw hole 11 and the fitting recess 12 on the steel plate 1.
  • the upper portion of the screw hole 11 may be provided with, for example, an inner spherical surface 13 depending on the shape of the screw used, which cooperates with the outer spherical surface 21 (Fig. 4) of the upper portion of the screw 2.
  • the fitting recess 12 is provided with a lock pin hole 14 through which the lock pin 4 passes, which cooperates with the mounting portion 43 (Fig. 6) of the lock pin 4.
  • the center portion of the lock piece 3 shown in Fig. 5 is provided with a lock pin mounting hole 31 having a diameter larger than the diameter of the lock pin hole 14 for accommodating the larger head of the lock pin 4.
  • an inner flange 32 extends inwardly from the mounting hole 31 in the radial direction thereof, and the head of the lock pin 4 can be placed over the inner flange 32, thereby connecting the lock piece 3 to the steel plate 1. Further, the head acts as a pushing portion 41 acting on the lock piece 3 to convert the rotational motion of the lock pin 4 into a linear motion of the lock piece 3.
  • the top end of the locking piece 3 extends outwardly in parallel to form a boss 33, preferably corresponding to the number and mounting direction of the screw holes 11, such as the two bosses 33 shown in FIG.
  • a boss 33 preferably corresponding to the number and mounting direction of the screw holes 11, such as the two bosses 33 shown in FIG.
  • the inner spherical surface 13 in the threaded hole 11 can also be placed at a distance from the top surface of the steel plate to further enlarge the space.
  • a boss curved surface 34 similar in shape to the edge of the screw hole 11 may be formed on the boss 33.
  • the bossing cam surface 34 can serve as a partial outer edge of the threaded hole 11 to facilitate insertion and removal of the screw 2.
  • the pushing portion 41 of the lock pin 4 is designed as an eccentric structure, and as shown in FIGS. 6 and 7, the pushing portion 41 of the lock pin 4 is offset from the center of gravity of the mounting portion 43 of the lower portion of the lock pin. . Thereby, the rotation of the lock pin 4 causes the eccentric structure to push the lock piece 3 to move in the fitting groove 12.
  • a step portion 44 of the same eccentricity may be added under the pushing portion 41, which is caught between the inner flange 32 of the locking piece 3 and the locking pin hole 14 of the steel plate 1, which helps to increase the locking pin 4 to the lock.
  • the pushing action of the sheet 3 also reduces the diameter of the mounting portion 43 to facilitate the engagement of the mounting portion 43 with the steel sheet 1.
  • the mounting portion 43 of the locking pin 4 can penetrate the steel plate 1 and be rotatably connected to the steel plate 1 as shown in FIG. 7 or can be engaged in the locking pin hole 14 by, for example, a thread or the like without protruding from the steel plate 1 The bottom surface.
  • the locking pin 4 and the steel plate 1 may also be connected by using a circlip at the bottom of the locking pin, etc., .
  • the locking piece 3 is located on one side of the fitting recess 12 as shown in Fig. 8 and exposes the screw hole 11, and the boss curved surface 34 on the boss 33 is shaped to match the outer edge of the screw hole 11.
  • a special screwdriver is placed in the lock pin groove 42 to perform a rotating motion, and the lock pin 4 can be driven to rotate integrally in the lock pin hole 14 of the steel plate 1.
  • the eccentric push portion 41 of the lock pin 4 rotates on the inner flange 32 of the lock piece 3, thereby causing the lock piece 3 to linearly move along the fitting groove 12.
  • the screw When the boss 33 of the lock piece 3 is moved to the top surface portion of the screw 2, the screw is in a locked state. Similarly, if the lock pin 4 is rotated in the opposite direction, the release of the anti-drop device can be achieved, for example, when the patient needs to take out the neck push-forward steel plate.
  • the anti-drop device of the present invention can achieve locking of more screws by changing the shape of the locking piece.
  • Figures 10-16 illustrate another embodiment of locking a plurality of screws.
  • the locking tabs 4 are disposed therebetween with two symmetrical locking tabs 3 disposed therebetween.
  • the pushing portion 41 of the locking pin 4 is formed in an elliptical structure to simultaneously push the two locking pieces 3 to achieve simultaneous locking or release of the four screws 2.
  • each of the locking tabs 3 has a mating face 37 that cooperates with the elliptical push portion 41 of the locking pin 4 to reduce the size of the anti-drop device.
  • the locking piece 3 in this embodiment is not connected to the steel plate 1 by the lock pin 4, but is connected by means of its own structure and the fitting structure on the fitting groove 12.
  • the two sides of the locking plate 3 connected to the steel plate 1 are respectively provided with a card edge 35, and the mounting groove 12 of the steel plate 1 is correspondingly provided with a card slot 16 for snapping the card edge 35 into the card.
  • the locking piece 3 can be connected to the steel plate in the groove 16 and can reciprocate linearly along the card slot 16.
  • a positioning recess 15 is provided in the fitting recess 12 to cooperate with the positioning projection 36 on the bottom surface of the lock piece 3 shown in Fig. 14.
  • the rotation locking pin 4 pushes the locking piece 3 to the desired locking position, and the positioning protrusion 36 of the locking piece 3 enters the positioning concave hole 15 on the fitting groove, and issues a "Kata" sound prompt lock. Tight in place.
  • the operation of releasing the locking device in this embodiment is also slightly different from that of the first embodiment. As shown in Fig. 17, the pusher 41 of the lock pin is first rotationally reset using a special driver, and then the other is placed in the fitting groove 12 by another type of resetter, such as the one shown in the figure.
  • the locking piece is mostly made of a metal material, the elasticity of the metal material itself can cause the positioning protrusion to be ejected from the positioning recess hole in the fitting groove to remove the boss 33 of the locking piece from the top surface of the screw.
  • the locking piece is pushed so that its mating surface 37 abuts against the pushing portion 41 of the locking pin, the locking of the locking piece can be achieved.

Abstract

A locking device for an anterior cervical steel plate (1) includes at least one screw (2) and an anti-release device, with the screw (2) assembled in at least one screw hole (11) disposed on the steel plate (1). The anti-release device is installed in an assembly recess (12) disposed at the location close to the screw hole (11) on the steel plate (1), and includes a first component(4) and a second component (3) capable of coordinated movement. The first component(4) can push the second component (3) to move reciprocatingly along the assembly recess (12), so as to locate a part of the second component (3) on the upper surface of the screw (2) to prevent the screw (2) from releasing, or to move the part of the second component (3) away from the upper surface of the screw (2) to facilitate assembling the screw (2).

Description

一种颈推前路钢板的锁紧装置 本申请要求于 2009 年 10 月 16 日提交中国专利局、 申请号为 200910197332.2、 发明名称为"一种颈推前路钢板的锁紧装置"的中国专利 申请的优先权, 其全部内容通过引用结合在本申请中。 技术领域  The invention relates to a Chinese patent granted by the Chinese Patent Office on October 16, 2009, the application number is 200910197332.2, and the invention name is "a locking device for a neck pusher steel plate". Priority of the application, the entire contents of which are incorporated herein by reference. Technical field
本发明涉及一种广泛用于外科矫形装置的骨科内植入物——颈推前路 钢板的锁紧装置, 尤其涉及将骨板螺釘相对于骨板锁紧的防脱装置。 背景技术  BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to an orthopaedic implant widely used in surgical orthopedic devices, a locking device for a anterior cervical plate, and more particularly to an anti-off device for locking a bone plate screw relative to a bone plate. Background technique
1964年 Bohler报道了首例颈推前路钢板螺釘应用于下颈推骨折的病 例。 早期的颈推前路钢板系统是不带防脱装置的, 由于人体脊柱的特殊生 理结构及活动频繁性,钢板与螺釘接合部易出现松动,如要达到坚强固定, 螺釘尾端螺纹必须穿透推体后方的骨皮质, 因而增加了手术操作难度, 同 时增加了脊髓损伤的潜在危险。 1986年人们研究出颈推带锁钢板, 通过固 定螺釘头端的防脱装置, 使钢板与螺釘牢固结合, 螺釘尾端不需穿透推体 后方的骨皮质即可达到固定效果。 带锁的颈推前路钢板大大筒化了操作, 增加手术安全性, 减少并发症。  In 1964 Bohler reported the first case of a neck-push anterior plate screw applied to a lower neck thrust fracture. The early anterior cervical plate system does not have an anti-off device. Due to the special physiological structure and frequent activities of the human spine, the joint between the steel plate and the screw is prone to loosening. To achieve strong fixation, the screw at the end of the screw must penetrate. Pushing the cortical bone behind the body increases the difficulty of surgery and increases the potential risk of spinal cord injury. In 1986, the neck push-locked steel plate was studied. The steel plate and the screw were firmly combined by fixing the tip end of the screw, and the screw end of the screw did not need to penetrate the cortical bone behind the pusher to achieve the fixation effect. The locking anterior plate of the neck pushes the tube greatly, which increases the safety of the operation and reduces complications.
带锁的颈推前路钢板发展至今, 其防脱装置已经演变出各种型式, 其 目的, 都是为了给螺釘提供更安全可靠的锁紧, 以及更筒便的操作。 但同 时,各种类型的防脱装置也都存在着各自的不足。例如, Zerphir ( Sofamor ) 钢板的防脱方式是通过拨片顶端压紧螺釘头的方式, 将锁片推拨到位实现 锁紧。 虽然这种结构可以实现一次锁紧两枚螺釘, 而且系统切迹较低, 但 却存在系统翻修时防脱装置退出操作困难, 要求较高的手术技巧且手术时 间可能会延长等缺陷。 Slim-loc ( Depuy ) 为" Cam-Loc"凸轮锁紧机制, 该 装置使用偏心凸轮侧压螺釘头的防脱方式。 虽然操作较筒单, 而且锁紧力 较大, 但锁紧凸轮易滑丝, 旋转〉270°时锁紧失效。 Vectra ( Synthes ) 的 防脱装置为 "Elgiloy夹子", 通过夹子卡入螺釘头部的 EJ槽, 阻挡螺釘的脱 出。 但是夹子结构较单薄, 在反复翻修时, 夹子容易被损坏失效。 Trinica ( Zimmer )是使用顶端压紧的防脱方式, 防脱装置旋转, 可以实现一次锁 紧三枚螺釘。 但是这种防脱装置切迹较高, 容易对食道产生不良刺激, 引 起病人的不适感, 而且由于防脱装置所占空间较大, 钢板植骨视窗设计的 可能性几乎为零。 发明内容 The lockable neck pusher steel plate has been developed to date, and its anti-offset device has evolved into various types, the purpose of which is to provide a safer and more reliable locking for the screw, as well as a more convenient operation. At the same time, however, various types of anti-off devices also have their own shortcomings. For example, the Zerphir ( Sofamor) steel plate is prevented from being locked by pushing the locking piece in place by pressing the screw head at the top of the paddle. Although this structure can realize the locking of two screws at a time, and the system has a low notch, there are defects such as difficulty in withdrawing the anti-off device during system rebuilding, requiring high surgical skills and prolonged operation time. Slim-loc (Depuy) is a "Cam-Loc" cam locking mechanism that uses an eccentric cam side pressure screw head to prevent it. Although the operation is simpler and the locking force is larger, the locking cam is easy to slide, and the locking fails when the rotation is 270°. The Vectra (Synthes) anti-offset device is an "Elgiloy clip" that is snapped into the EJ slot of the screw head by a clip to block the escape of the screw. However, the clip structure is relatively thin, and the clip is easily damaged by repeated repairs. Trinica (Zimmer) is a detachment prevention method using a top press, and the anti-off device rotates, so that three screws can be locked at a time. However, this anti-off device has a high notch, which is easy to cause bad stimulation to the esophagus, causing discomfort to the patient, and because the space occupied by the anti-off device is large, the possibility of designing the plate bone window is almost zero. Summary of the invention
为了解决现有技术中的上述缺陷, 本发明提出了一种新型的颈推前路 钢板的锁紧装置,该锁紧装置不仅可以实现对骨板螺釘的快速锁紧及释放, 并且切迹较低, 有利于病患的治疗和恢复。  In order to solve the above-mentioned defects in the prior art, the present invention proposes a novel locking device for a neck-pushing front steel plate, which not only can achieve fast locking and release of the bone plate screw, but also has a notch Low, which is conducive to the treatment and recovery of patients.
本发明的锁紧装置包括至少一个螺釘以及防脱装置, 其中, 所述螺釘 装配在所述钢板上设置的至少一个螺釘孔内, 所述钢板上接近所述螺釘孔 处设置有装配凹槽, 所述防脱装置置于该装配凹槽中, 包括协同运动的第 一和第二部件, 第一部件可推动所述第二部件沿该装配凹槽往复移动, 以 使第二部件的一部分位于所述螺釘的顶表面上方以防止螺釘退出, 或者从 螺釘的顶部移开便于装配螺釘。  The locking device of the present invention includes at least one screw and a retaining device, wherein the screw is fitted in at least one screw hole provided on the steel plate, and the mounting hole is disposed on the steel plate near the screw hole. The detachment prevention device is disposed in the fitting groove, and includes first and second members that cooperate with each other, and the first member can urge the second member to reciprocate along the fitting groove such that a portion of the second member is located Above the top surface of the screw to prevent the screw from exiting, or removing from the top of the screw facilitates assembly of the screw.
在本发明中, 所述防脱装置中的第一部件为连接至所述钢板的锁销, 所述第二部件为在所述装配 EJ槽中移动的锁片。 其中, 所述锁销的一端形 成推动部, 能够将其自身的旋转运动转换为所述锁片的直线运动; 所述锁 销的另一端形成安装部, 该安装部插入所述钢板上形成的孔内并可在其中 旋转。 当然, 锁销和锁片的协同运动并不受限于此种方式。 举例来说, 亦 可沿直线推拨锁销运动, 并带动一体连接的锁片直线运动。  In the present invention, the first member of the detachment prevention device is a lock pin connected to the steel plate, and the second member is a lock piece that moves in the assembled EJ groove. Wherein, one end of the locking pin forms a pushing portion, which can convert its own rotary motion into a linear motion of the locking piece; the other end of the locking pin forms a mounting portion, and the mounting portion is inserted into the steel plate. Inside the hole and can rotate in it. Of course, the coordinated movement of the locking pin and the locking tab is not limited in this way. For example, it is also possible to push the lock pin movement in a straight line and drive the linear motion of the integrally connected lock piece.
根据一种实施方式, 所述推动部形成为偏心结构, 如一凸轮结构, 该 偏心结构插入所述锁片上设置的孔内, 并在旋转锁销时推抵所述锁片的孔 的内侧以推动锁片移动。  According to an embodiment, the pushing portion is formed as an eccentric structure, such as a cam structure, which is inserted into a hole provided in the locking piece and pushes against the inner side of the hole of the locking piece when the locking pin is rotated to push The lock piece moves.
根据另一种实施方式, 所述锁片包括形状对称的第一和第二锁片, 所 述锁销位于两锁片之间, 所述推动部形成为椭圆结构, 在旋转锁销时, 该 椭圆结构推抵两锁片的侧边以推动锁片移动。  According to another embodiment, the locking piece includes first and second locking pieces that are symmetric in shape, the locking pin is located between the two locking pieces, and the pushing portion is formed in an elliptical structure, when the locking pin is rotated, The elliptical structure pushes against the sides of the two locking pieces to push the locking piece to move.
在前面一种实施方式中, 可通过锁销与锁片的连接来将锁片连接至钢 板上, 对于使用一个或两个螺釘的情形, 这种连接方式尤其有利, 可以有 效地减少整个锁紧装置的尺寸。 对于后一种实施方式, 锁片则需采用额外 的连接方式。 例如, 在第一和第二锁片上分别设有卡边, 所述装配凹槽上 对应的安装部位设有卡槽, 所述卡边可在所述卡槽中往复移动。 这样, 该 锁紧装置可适用于多于两个螺釘的情形, 尤其可用于同时锁紧四个螺釘。 In a previous embodiment, the locking piece can be connected to the steel plate by the connection of the locking pin and the locking piece. This connection is particularly advantageous in the case of using one or two screws, and may have Effectively reduce the size of the entire locking device. For the latter embodiment, the locking tab requires an additional connection. For example, a card edge is respectively disposed on the first and second locking pieces, and a corresponding mounting portion on the mounting groove is provided with a card slot, and the card edge can reciprocate in the card slot. In this way, the locking device can be adapted to more than two screws, in particular for simultaneously locking four screws.
为了进一步将两个锁片定位, 还可在第一和第二锁片安装于所述装配 凹槽内的底表面上分别设有定位凸起, 所述装配凹槽的表面上则设有相应 的定位凹孔。  In order to further position the two locking pieces, a positioning protrusion may be respectively disposed on the bottom surface of the first and second locking pieces mounted in the fitting groove, and the surface of the fitting groove is correspondingly disposed. Positioning the recessed holes.
有利地, 所述锁片的顶端向外平行延伸形成至少一个凸台, 在锁紧状 态下, 所述凸台位于所述至少一个螺釘孔的上方, 而锁片的底部则保持在 装配凹槽内, 以使得所述凸台的底表面与装配好的螺釘的顶表面之间留有 一定空间。 这样, 即使在该防脱装置已将螺釘锁紧的状态下, 螺釘仍能在 所述空间内实现一定范围的摆动, 这有利于使钢板和螺釘头部的结合部位 受力均匀。 此外, 在颈前路内固定术中, 植骨块融合期间会发生骨质吸收 现象, 所以推间高度会有所降低, 而螺釘在已定范围内的摆动可缩小由于 骨质吸收造成的间隙. 进而实现对植骨块的加压作用, 防止由于应力遮挡 导致植骨块不愈合的发生, 促进植骨块的愈合。  Advantageously, the top end of the locking piece extends outwardly in parallel to form at least one boss. In the locked state, the boss is located above the at least one screw hole, and the bottom of the locking piece is retained in the mounting groove. Inside, such that a space is left between the bottom surface of the boss and the top surface of the assembled screw. Thus, even in the state where the retaining device has locked the screw, the screw can achieve a certain range of swing in the space, which is advantageous in that the joint portion of the steel plate and the screw head is uniformly biased. In addition, in the anterior cervical internal fixation, bone resorption occurs during fusion of the bone graft, so the height of the push is reduced, and the swing of the screw within the predetermined range can reduce the gap due to bone absorption. Further, the pressurization effect on the bone graft is prevented, and the non-healing of the bone graft due to the stress shielding is prevented, and the healing of the bone graft is promoted.
进一步地, 在优选实施方式中, 所述凸台的形状与所述螺纹孔的形状 对应。 这种情形下, 在防脱装置处于未锁紧状态时, 所述凸台可形成为螺 纹孔的一部分, 锁片的尺寸以及整个锁紧装置的尺寸可相应减小。  Further, in a preferred embodiment, the shape of the boss corresponds to the shape of the threaded hole. In this case, when the retaining device is in the unlocked state, the boss can be formed as a part of the threaded hole, and the size of the locking piece and the size of the entire locking device can be correspondingly reduced.
此外, 所述锁销的底部, 即安装部可穿透所述钢板上的孔以便于锁销 与钢板的连接。 可选地, 所述锁销与所述钢板可通过铆接、 螺纹连接或在 所述锁销的底部使用弹性挡圈等方式连接。  Further, the bottom of the lock pin, i.e., the mounting portion, can penetrate the hole in the steel plate to facilitate the connection of the lock pin to the steel plate. Optionally, the locking pin and the steel plate may be connected by riveting, screwing or using a circlip at the bottom of the locking pin.
通过本发明的上述方案, 由于在锁紧装置中采取了锁片顶端遮挡螺釘 头的防脱方式, 可以实现一次锁紧至少一枚螺釘, 且整个锁紧装置的切迹 较低。 操作上则采用旋转推进 /退出的方式, 将锁销的旋转运动转换为锁片 的直线运动, 使锁销的旋转轨迹较短, 不仅为螺釘提供了安全可靠的防脱 保护, 而且操作筒便省力, 降低手术难度。 使用防脱装置将骨板螺釘锁紧 后, 螺釘还可以实现一定角度范围内的偏摆。 另外, 由于该锁紧装置体积 较小, 使得钢板可以设置较大的植骨视窗, 便于医生在手术中观察植骨的 状况。 附图说明 According to the above aspect of the present invention, since the locking piece is shielded from the screw head in the locking device, at least one screw can be locked at a time, and the entire locking device has a low notch. In operation, the rotary propulsion/exit mode is adopted to convert the rotary motion of the lock pin into the linear motion of the lock piece, so that the rotation track of the lock pin is shorter, which not only provides safe and reliable anti-off protection for the screw, but also operates the tube. Save effort and reduce the difficulty of surgery. After the bone plate screws are locked by the anti-off device, the screws can also achieve yaw within a certain angle range. In addition, due to the small size of the locking device, the steel plate can be provided with a larger bone grafting window, which is convenient for the doctor to observe the bone graft during the operation. Status. DRAWINGS
本发明的其它特征及优点将通过下面结合附图对非限定性实施方式的 描述而更清楚地显现, 其中:  Other features and advantages of the present invention will become apparent from the following description of the non-limiting embodiments,
图 la和 lb示出了根据本发明一实施方式的锁紧装置中, 防脱装置处 于未锁紧状态下的示意图, 图 la为俯视图, 图 lb为透视图, 其中部分钢 板被切除以清楚示出锁片和螺釘的结构;  1a and 1b are schematic views showing the anti-offset device in an unlocked state in a locking device according to an embodiment of the present invention, wherein FIG. 1a is a plan view, and FIG. 1b is a perspective view, in which a part of the steel plate is cut away to clearly show The structure of the locking piece and the screw;
图 2a和 2b示出了所述防脱装置处于锁紧状态下的示意图,图 2a为俯 视图,图 2b为透视图,其中部分钢板被切除以清楚示出锁片和螺釘的结构; 图 3为所述钢板的透视图;  2a and 2b show a schematic view of the anti-drop device in a locked state, Fig. 2a is a plan view, and Fig. 2b is a perspective view, in which a part of the steel plate is cut away to clearly show the structure of the locking piece and the screw; a perspective view of the steel sheet;
图 4为所述螺釘的透视图;  Figure 4 is a perspective view of the screw;
图 5为所述锁片的透视图;  Figure 5 is a perspective view of the locking piece;
图 6为所述锁销的透视图;  Figure 6 is a perspective view of the lock pin;
图 7为所述锁紧装置的剖面图, 示出了所述锁片的凸台与螺釘顶表面 的位置关系, 以及锁销和锁片的截面结构;  Figure 7 is a cross-sectional view of the locking device, showing the positional relationship between the boss of the locking piece and the top surface of the screw, and the sectional structure of the locking pin and the locking piece;
图 8和图 9分别示出了本发明锁紧装置中各部件在锁紧状态以及未锁 紧状态下的位置配合关系, 其中只示出了一个螺釘;  8 and 9 respectively show the positional cooperation of the components in the locking device of the present invention in the locked state and the un-locked state, wherein only one screw is shown;
图 10示出了根据本发明另一实施方式的锁紧装置的示意图,此时防脱 装置处于未锁紧状态;  Figure 10 is a schematic view showing a locking device according to another embodiment of the present invention, in which case the anti-off device is in an unlocked state;
图 11为图 10所示防脱装置处于锁紧状态的示意图;  Figure 11 is a schematic view showing the anti-drop device shown in Figure 10 in a locked state;
图 12为图 10锁紧装置中钢板的示意图;  Figure 12 is a schematic view of a steel plate in the locking device of Figure 10;
图 13为图 10锁紧装置中锁片之一的示意图;  Figure 13 is a schematic view of one of the locking pieces in the locking device of Figure 10;
图 14为从另一角度观看所述锁片的示意图;  Figure 14 is a schematic view of the locking piece viewed from another angle;
图 15为图 10锁紧装置中锁销的示意图;  Figure 15 is a schematic view of the locking pin of the locking device of Figure 10;
图 16为图 11中锁紧装置在锁紧状态下的剖面图; 以及  Figure 16 is a cross-sectional view of the locking device of Figure 11 in a locked state;
图 17为将图 11中锁紧装置复位至未锁紧状态的操作示意图。  Figure 17 is a schematic view showing the operation of resetting the locking device of Figure 11 to an unlocked state.
附图标记说明 1钢板 11螺钉孔 Description of the reference numerals 1 steel plate 11 screw hole
12装配凹槽 13内球面  12 fitting groove 13 inner spherical surface
14锁销孔 15 定位凹孔  14 lock pin hole 15 positioning recess hole
16卡槽 2螺钉  16 card slot 2 screw
21外球面 3锁片  21 outer spherical surface 3 locking piece
31锁销安装孔 32内凸缘  31 lock pin mounting hole 32 inner flange
33凸台 34凸台弧面  33 bosses 34 bosses
35卡边 36定位凸起  35 card edge 36 positioning bulge
37锁销配合面 4锁销  37 lock pin mating surface 4 lock pin
41推动部 42锁销槽  41 pusher 42 lock pin slot
43安装部 44阶梯部  43 installation part 44 step part
5 复位起子 具体实施方式  5 reset starter
下面通过具体实施方式来详细描述本发明的锁紧装置, 以更好地理解 该锁紧装置, 尤其是其防脱装置的结构、 功能和效果。 其中相同的附图标 记标识相同或相似的部件。  The locking device of the present invention will be described in detail below by way of specific embodiments to better understand the structure, function and effect of the locking device, particularly its anti-off device. Where the same reference numerals identify the same or similar components.
图 la-9示出了 "一锁两" 的第一实施方式, 图 10-16示出了 "一锁四" 的第二实施方式。 在各实施方式中, 用于钢板 1的锁紧装置包括至少一个 螺釘 2以及阻止螺釘 2退出的防脱装置。 其中, 所述螺釘 2装配在钢板 1 上设置的至少一个螺釘孔 11内并可插入至颈推体,而钢板 1上接近所述螺 釘孔 11处设置有装配凹槽 12, 所述防脱装置可置于其中, 并可沿该装配 W槽 12往复移动, 防脱装置可包括第一和第二部件,其中第一部件可推动 第二部件实现沿装配凹槽的往复移动, 并使得第二部件的一部分位于螺釘 Figure la-9 shows a first embodiment of "one lock two" and Figures 10-16 show a second embodiment of "one lock four". In each of the embodiments, the locking device for the steel sheet 1 includes at least one screw 2 and a retaining device that prevents the screw 2 from being withdrawn. The screw 2 is mounted in at least one screw hole 11 provided on the steel plate 1 and can be inserted into the neck pusher body, and the mounting groove 12 is disposed on the steel plate 1 near the screw hole 11, and the anti-off device Placeable therein and reciprocally movable along the assembly W-slot 12, the anti-drop device can include first and second members, wherein the first member can push the second member to effect reciprocal movement along the fitting groove and cause the second Part of the part is located in the screw
2的顶表面上方防止螺釘退出, 或者从螺釘 2的顶部移开便于装配螺釘。 该装配凹槽 12的形状可与第二部件的形状相符合,以使得安装防脱装置后 的该锁紧装置的切迹较低, 没有突出于钢板表面的部分, 避免病患产生不 适感。 The top of the top surface of the 2 prevents the screw from exiting, or the removal from the top of the screw 2 facilitates the assembly of the screw. The shape of the fitting recess 12 can be matched with the shape of the second member, so that the locking device after the anti-drop device is installed has a low notch and does not protrude from the surface of the steel sheet to prevent the patient from being uncomfortable.
在所示出的防脱装置中, 所述第一部件为锁销 4, 第二部件为锁片 3。 在图 la-9示出的第一实施方式中, 锁销 4将锁片 3与所述钢板 1连接。 这 种情况下,所述锁片 3的形状与所述装配凹槽 12的形状完全相符。这里以 两个螺釘 2为例,所述钢板 1上相应设有两个螺釘孔 11。所述装配凹槽 12 以及对应的所述锁片 3的位置设置在两个螺釘孔之间, 以实现同时对两个 螺釘的锁紧和释放。 当然, 锁片的尺寸可以根据实际需要改变, 例如将其 宽度变窄来只锁紧一个螺釘, 或者将其形状更改来锁紧更多的螺釘。 In the anti-drop device shown, the first component is a locking pin 4 and the second component is a locking tab 3. In the first embodiment shown in Figures la-9, the locking pin 4 connects the locking tab 3 to the steel plate 1. In this case, the shape of the locking piece 3 exactly matches the shape of the fitting groove 12. Here, two screws 2 are taken as an example, and the steel plate 1 is provided with two screw holes 11 correspondingly. The mounting groove 12 and the corresponding position of the locking piece 3 are disposed between the two screw holes to achieve simultaneous locking and release of the two screws. Of course, the size of the locking piece can be changed according to actual needs, such as narrowing its width to lock only one screw, or changing its shape to lock more screws.
图 la和 lb示出了防脱装置未锁紧的状态, 此时锁片 3位于装配凹槽 12的一侧, 露出了完整的螺釘孔 11 , 螺釘 2可以自由地进出钢板 1。 图 2a 和 2b则示出了防脱装置已锁紧的状态, 此时锁片 3向装配凹槽 12的另一 侧移动, 并部分位于已装配好的螺釘 2的顶表面之上, 阻止了螺釘 2的退 出。  Figures la and lb show the state in which the detachment prevention device is not locked, and at this time, the lock piece 3 is located on one side of the fitting recess 12, exposing the complete screw hole 11, and the screw 2 can freely enter and exit the steel plate 1. Figures 2a and 2b show the state in which the retaining device has been locked, at which point the locking tab 3 is moved towards the other side of the fitting recess 12 and partially over the top surface of the assembled screw 2, preventing it. The exit of the screw 2.
图 3至图 6分别示出了该锁紧装置各部件的结构。 图 3清楚显示了钢 板 1上螺釘孔 11和装配凹槽 12的结构。螺釘孔 11的上侧较大部分根据所 使用的螺釘形状可设有例如内球面 13 ,其与螺釘 2上部的外球面 21 (图 4 ) 相配合。 装配凹槽 12上设有供锁销 4穿过的锁销孔 14, 其与锁销 4的安 装部 43 (图 6 )相配合。 图 5示出的锁片 3的中心部分开有锁销安装孔 31 , 该安装孔的直径大于所述锁销孔 14的直径,用以容置锁销 4的较大的头部。 进一步, 从所述安装孔 31 沿其径向方向向内延伸有一内凸缘 32, 锁销 4 的头部可放置于该内凸缘 32之上,从而实现将锁片 3连接于钢板 1。并且, 该头部作为作用于锁片 3的推动部 41 , 可将锁销 4的旋转运动转换为锁片 3的直线运动。  Figures 3 through 6 show the construction of the various components of the locking device, respectively. Figure 3 clearly shows the structure of the screw hole 11 and the fitting recess 12 on the steel plate 1. The upper portion of the screw hole 11 may be provided with, for example, an inner spherical surface 13 depending on the shape of the screw used, which cooperates with the outer spherical surface 21 (Fig. 4) of the upper portion of the screw 2. The fitting recess 12 is provided with a lock pin hole 14 through which the lock pin 4 passes, which cooperates with the mounting portion 43 (Fig. 6) of the lock pin 4. The center portion of the lock piece 3 shown in Fig. 5 is provided with a lock pin mounting hole 31 having a diameter larger than the diameter of the lock pin hole 14 for accommodating the larger head of the lock pin 4. Further, an inner flange 32 extends inwardly from the mounting hole 31 in the radial direction thereof, and the head of the lock pin 4 can be placed over the inner flange 32, thereby connecting the lock piece 3 to the steel plate 1. Further, the head acts as a pushing portion 41 acting on the lock piece 3 to convert the rotational motion of the lock pin 4 into a linear motion of the lock piece 3.
锁片 3的顶端向外平行延伸形成凸台 33 , 优选对应于所述螺釘孔 11 的数目和安装方向,如图 5示出的两个凸台 33。这样可以使得所述凸台 33 的底表面与装配好的螺釘 2的顶表面之间留有一定空间,图 2b和图 7都清 楚示出了这一特征。 为此目的, 所述螺纹孔 11内的内球面 13也可设置在 相距钢板顶表面一定距离处, 以进一步扩大该空间。 此外, 在该凸台 33 上还可以形成有与螺纹孔 11的边缘形状类似的凸台弧面 34。 在锁片处于 未锁紧状态时, 如图 8所示, 该凸台弧面 34可充当螺纹孔 11的部分外边 缘, 以便于螺釘 2的插入和取出。 在该实施方式中, 所述锁销 4的推动部 41被设计为偏心结构, 如图 6 和图 7中所示,锁销 4的推动部 41相对于锁销下部的安装部 43重心偏移。 由此, 锁销 4的转动可促使该偏心结构推动锁片 3在装配凹槽 12中移动。 还可在该推动部 41 的下方增设一同样偏心的阶梯部 44, 其卡扣在锁片 3 的内凸缘 32和钢板 1的锁销孔 14之间, 有助于增加锁销 4对锁片 3的推 动作用, 同时亦可减少安装部 43的直径大小, 便于该安装部 43与钢板 1 的接合。 The top end of the locking piece 3 extends outwardly in parallel to form a boss 33, preferably corresponding to the number and mounting direction of the screw holes 11, such as the two bosses 33 shown in FIG. This allows a certain space to be left between the bottom surface of the boss 33 and the top surface of the assembled screw 2, which is clearly shown in Figures 2b and 7. For this purpose, the inner spherical surface 13 in the threaded hole 11 can also be placed at a distance from the top surface of the steel plate to further enlarge the space. Further, a boss curved surface 34 similar in shape to the edge of the screw hole 11 may be formed on the boss 33. When the locking tab is in the unlocked state, as shown in Fig. 8, the bossing cam surface 34 can serve as a partial outer edge of the threaded hole 11 to facilitate insertion and removal of the screw 2. In this embodiment, the pushing portion 41 of the lock pin 4 is designed as an eccentric structure, and as shown in FIGS. 6 and 7, the pushing portion 41 of the lock pin 4 is offset from the center of gravity of the mounting portion 43 of the lower portion of the lock pin. . Thereby, the rotation of the lock pin 4 causes the eccentric structure to push the lock piece 3 to move in the fitting groove 12. A step portion 44 of the same eccentricity may be added under the pushing portion 41, which is caught between the inner flange 32 of the locking piece 3 and the locking pin hole 14 of the steel plate 1, which helps to increase the locking pin 4 to the lock. The pushing action of the sheet 3 also reduces the diameter of the mounting portion 43 to facilitate the engagement of the mounting portion 43 with the steel sheet 1.
所述锁销 4的安装部 43可如图 7所示穿透所述钢板 1并与钢板 1可旋 转地连接, 亦可通过例如螺纹等方式接合于锁销孔 14内而不突出于钢板 1 的底面。 可选地, 在安装部 43穿透钢板 1的情况下, 所述锁销 4与所述钢 板 1还可通过在所述锁销的底部使用弹性挡圈等方式连接, 在此不——赘 述。  The mounting portion 43 of the locking pin 4 can penetrate the steel plate 1 and be rotatably connected to the steel plate 1 as shown in FIG. 7 or can be engaged in the locking pin hole 14 by, for example, a thread or the like without protruding from the steel plate 1 The bottom surface. Optionally, in a case where the mounting portion 43 penetrates the steel plate 1, the locking pin 4 and the steel plate 1 may also be connected by using a circlip at the bottom of the locking pin, etc., .
现在结合图 8和图 9来说明该实施方式的锁紧装置的操作过程。  The operation of the locking device of this embodiment will now be described with reference to Figs. 8 and 9.
初始状态时,锁片 3如图 8所示位于装配凹槽 12的一侧并露出螺釘孔 11 , 凸台 33上的凸台弧面 34与螺釘孔 11的外边缘形状配合。 将螺釘 2插 入该螺釘孔 11中并旋紧至颈推体之后, 使用专用起子放置于锁销槽 42中 执行旋转动作,可驱动锁销 4在钢板 1的锁销孔 14中整体旋转。 随着锁销 4的转动, 锁销 4的偏心的推动部 41在锁片 3的内凸缘 32上转动, 从而 带动锁片 3沿装配凹槽 12直线移动。 当锁片 3的凸台 33移至螺釘 2的顶 表面部分时, 螺釘处于被锁紧的状态。 类似地, 反方向旋转锁销 4, 则可 实现对该防脱装置的释放, 例如可在病患痊愈需取出该颈推前路钢板时退 出螺訂 2。  In the initial state, the locking piece 3 is located on one side of the fitting recess 12 as shown in Fig. 8 and exposes the screw hole 11, and the boss curved surface 34 on the boss 33 is shaped to match the outer edge of the screw hole 11. After the screw 2 is inserted into the screw hole 11 and screwed to the neck pusher body, a special screwdriver is placed in the lock pin groove 42 to perform a rotating motion, and the lock pin 4 can be driven to rotate integrally in the lock pin hole 14 of the steel plate 1. As the lock pin 4 rotates, the eccentric push portion 41 of the lock pin 4 rotates on the inner flange 32 of the lock piece 3, thereby causing the lock piece 3 to linearly move along the fitting groove 12. When the boss 33 of the lock piece 3 is moved to the top surface portion of the screw 2, the screw is in a locked state. Similarly, if the lock pin 4 is rotated in the opposite direction, the release of the anti-drop device can be achieved, for example, when the patient needs to take out the neck push-forward steel plate.
如上所述的, 本发明的防脱装置可通过改变锁片的形状来实现对更多 螺釘的锁紧。 图 10-16示出了锁紧多个螺釘的另一种实施方式。 在该第二 实施方式中, 采用设置两个形状对称的锁片 3的方式, 锁销 4位于其间。 其中锁销 4的推动部 41形成为椭圆结构以同时推动两个锁片 3 , 实现对四 个螺釘 2的同时锁紧或释放。 从图 10和图 11可以看出, 每个锁片 3都具 有与锁销 4的椭圆形推动部 41形状配合的配合面 37以减少防脱装置的 尺寸。 当旋转锁销 4时, 推动部 41推动锁片 3的相应配合面 37使锁 片 3直线运动, 锁片的凸台 33移至螺钉的上方锁紧螺钉 2, 达到螺钉 防退的功能, 如图 16所示。 As described above, the anti-drop device of the present invention can achieve locking of more screws by changing the shape of the locking piece. Figures 10-16 illustrate another embodiment of locking a plurality of screws. In this second embodiment, the locking tabs 4 are disposed therebetween with two symmetrical locking tabs 3 disposed therebetween. The pushing portion 41 of the locking pin 4 is formed in an elliptical structure to simultaneously push the two locking pieces 3 to achieve simultaneous locking or release of the four screws 2. As can be seen from Figures 10 and 11, each of the locking tabs 3 has a mating face 37 that cooperates with the elliptical push portion 41 of the locking pin 4 to reduce the size of the anti-drop device. When the lock pin 4 is rotated, the pushing portion 41 pushes the corresponding mating face 37 of the locking piece 3 to make the lock The sheet 3 moves linearly, and the boss 33 of the locking piece is moved to the upper locking screw 2 of the screw to achieve the anti-backup function of the screw, as shown in FIG.
与第一实施方式不同的是, 这一实施方式中的锁片 3没有通过锁 销 4来连接至钢板 1,而是借助于其自身的结构以及装配凹槽 12上的 配合结构来实现连接。 如图 12和 13所示, 锁片 3上连接至钢板 1的 两侧分别设有卡边 35, 钢板 1的装配凹槽 12上则对应设有卡槽 16, 将卡边 35卡扣进卡槽 16中即可将锁片 3连接于钢板,并可沿卡槽 16 往复直线运动。 另外, 在装配凹槽 12中还设有定位凹孔 15, 其与图 14示出的锁片 3的底表面上的定位凸起 36相配合。进行锁紧操作时, 转动锁销 4推动锁片 3到达期望的锁定位置, 锁片 3的定位凸起 36 会进入装配凹槽上的定位凹孔 15 内, 并发出 "卡塔" 声提示锁紧到 位。 该实施方式中锁紧装置释放的操作与第一实施方式也稍有不同。 如图 17所示, 首先使用专用起子将锁销的推动部 41旋转复位, 然后 用另一种复位起子, 例如图中所示的一字起 5 分别放入装配凹槽 12 中旋转推动锁片, 由于锁片大多采用金属材料制成, 金属材质本身的 弹性可使得定位凸起从装配凹槽上的定位凹孔中弹出以使锁片的凸 台 33移开螺钉的顶表面。 当锁片被推至使其配合面 37紧贴锁销的推 动部 41时, 即可实现锁片的复位。  Unlike the first embodiment, the locking piece 3 in this embodiment is not connected to the steel plate 1 by the lock pin 4, but is connected by means of its own structure and the fitting structure on the fitting groove 12. As shown in FIG. 12 and FIG. 13 , the two sides of the locking plate 3 connected to the steel plate 1 are respectively provided with a card edge 35, and the mounting groove 12 of the steel plate 1 is correspondingly provided with a card slot 16 for snapping the card edge 35 into the card. The locking piece 3 can be connected to the steel plate in the groove 16 and can reciprocate linearly along the card slot 16. Further, a positioning recess 15 is provided in the fitting recess 12 to cooperate with the positioning projection 36 on the bottom surface of the lock piece 3 shown in Fig. 14. When the locking operation is performed, the rotation locking pin 4 pushes the locking piece 3 to the desired locking position, and the positioning protrusion 36 of the locking piece 3 enters the positioning concave hole 15 on the fitting groove, and issues a "Kata" sound prompt lock. Tight in place. The operation of releasing the locking device in this embodiment is also slightly different from that of the first embodiment. As shown in Fig. 17, the pusher 41 of the lock pin is first rotationally reset using a special driver, and then the other is placed in the fitting groove 12 by another type of resetter, such as the one shown in the figure. Since the locking piece is mostly made of a metal material, the elasticity of the metal material itself can cause the positioning protrusion to be ejected from the positioning recess hole in the fitting groove to remove the boss 33 of the locking piece from the top surface of the screw. When the locking piece is pushed so that its mating surface 37 abuts against the pushing portion 41 of the locking pin, the locking of the locking piece can be achieved.
本发明的技术内容及技术特点已揭示如上, 然而可以理解, 在本发明 的创作思想下, 本领域的技术人员可以对上述结构作各种变化和改进, 但 都属于本发明的保护范围。  The technical content and technical features of the present invention have been disclosed as above, but it is to be understood that those skilled in the art can make various changes and modifications to the above-described structures under the creative idea of the present invention, but all fall within the scope of the present invention.

Claims

权 利 要 求 Rights request
1、 一种颈推前路钢板的锁紧装置, 包括至少一个螺釘以及防脱装置, 其中, 所述螺釘装配在所述钢板上设置的至少一个螺釘孔内, 所述钢板上 接近所述螺釘孔处设置有装配凹槽, 所述防脱装置置于该装配凹槽中, 包 括协同运动的第一和第二部件, 第一部件可推动所述第二部件沿该装配凹 槽往复移动, 以使第二部件的一部分位于所述螺釘的顶表面上方以防止螺 釘退出, 或者从螺釘的顶部移开便于装配螺釘。  A locking device for a steel plate for pushing a anterior road, comprising at least one screw and a detachment prevention device, wherein the screw is fitted in at least one screw hole provided on the steel plate, and the steel plate is close to the screw A fitting groove is disposed at the hole, and the retaining device is disposed in the fitting groove, and includes first and second members that cooperate with each other, and the first member can push the second member to reciprocate along the fitting groove, A portion of the second component is positioned over the top surface of the screw to prevent the screw from exiting or to be removed from the top of the screw for ease of assembly of the screw.
2、根据权利要求 1所述的锁紧装置, 其特征在于, 所述第一部件为连 接至所述钢板的锁销, 所述第二部件为在所述装配凹槽中移动的锁片。  The locking device according to claim 1, wherein the first member is a lock pin connected to the steel plate, and the second member is a lock piece that moves in the fitting groove.
3、根据权利要求 2所述的锁紧装置, 其特征在于, 所述锁销的一端形 成推动部, 能够将其自身的旋转运动转换为所述锁片的直线运动; 所述锁 销的另一端形成安装部, 该安装部插入所述钢板上形成的孔内并可在其中 旋转。  The locking device according to claim 2, wherein one end of the locking pin forms a pushing portion capable of converting its own rotational motion into a linear motion of the locking piece; One end forms a mounting portion that is inserted into a hole formed in the steel plate and rotatable therein.
4、根据权利要求 3所述的锁紧装置, 其特征在于, 所述推动部形成为 偏心结构, 该偏心结构插入所述锁片上设置的孔内, 并在旋转锁销时推抵 所述锁片的孔的内侧以推动锁片移动。  The locking device according to claim 3, wherein the pushing portion is formed as an eccentric structure, the eccentric structure is inserted into a hole provided in the locking piece, and is pushed against the lock when the locking pin is rotated The inside of the hole of the piece moves to move the lock piece.
5、根据权利要求 3所述的锁紧装置, 其特征在于, 所述锁片包括形状 对称的第一和第二锁片, 所述锁销位于两锁片之间, 所述推动部形成为椭 圆结构, 在旋转锁销时, 该椭圆结构推抵两锁片的侧边以推动锁片移动。  The locking device according to claim 3, wherein the locking piece comprises first and second locking pieces of symmetrical shape, the locking pin is located between the two locking pieces, and the pushing portion is formed as The elliptical structure pushes the side of the two locking pieces to push the locking piece to move when the locking pin is rotated.
6、根据权利要求 5所述的锁紧装置, 其特征在于, 所述第一和第二锁 片上分别设有卡边, 所述装配凹槽上对应的安装部位设有卡槽, 所述卡边 可在所述卡槽中往复移动。  The locking device according to claim 5, wherein the first and second locking pieces are respectively provided with a card edge, and the corresponding mounting portion of the mounting groove is provided with a card slot, the card The edge can reciprocate in the card slot.
7、根据权利要求 6所述的锁紧装置, 其特征在于, 所述第一和第二锁 片分别在其安装于所述装配凹槽内的底表面上设有定位凸起, 所述装配凹 槽的表面上设有相应的定位凹孔。  The locking device according to claim 6, wherein the first and second locking pieces are respectively provided with positioning projections on a bottom surface thereof mounted in the fitting recess, the assembly Corresponding positioning recesses are provided on the surface of the groove.
8、根据前述任一权利要求所述的锁紧装置, 其特征在于, 所述锁片的 顶端向外平行延伸形成至少一个凸台, 在锁紧状态下, 所述至少一个凸台 位于所述至少一个螺釘孔的上方, 以使得所述凸台的底表面与装配好的螺 釘的顶表面之间留有一定空间。 The locking device according to any of the preceding claims, wherein the top end of the locking piece extends outwardly in parallel to form at least one boss, and in the locked state, the at least one boss is located in the Above at least one of the screw holes such that a space is left between the bottom surface of the boss and the top surface of the assembled screw.
9、根据权利要求 8所述的锁紧装置, 其特征在于, 所述凸台的形状与 所述螺纹孔的形状对应。 The locking device according to claim 8, wherein the shape of the boss corresponds to the shape of the threaded hole.
10、 根据权利要求 9所述的锁紧装置, 其特征在于, 所述锁销的安装 部穿透所述钢板上的孔。  10. The locking device according to claim 9, wherein the mounting portion of the locking pin penetrates a hole in the steel plate.
11、根据权利要求 10所述的锁紧装置, 其特征在于, 所述锁销与所述 钢板通过铆接、 螺纹连接或在所述锁销的底部使用弹性挡圈的方式连接。  The locking device according to claim 10, wherein the lock pin is connected to the steel plate by riveting, screwing or at the bottom of the lock pin using a circlip.
PCT/CN2010/077776 2009-10-16 2010-10-15 Locking device for anterior cervical steel plate WO2011044852A1 (en)

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CN1711973A (en) * 2004-06-23 2005-12-28 英属维京群岛商冠亚股份有限公司 Bone fixing device with sliding cover to be preventing from taking off
US20060149253A1 (en) * 2005-01-06 2006-07-06 Doubler Robert L Spinal plate with internal screw locks
CN1954784A (en) * 2005-09-16 2007-05-02 黑石医药公司 Anterior cervical plate fixation system
US20080091206A1 (en) * 2006-10-13 2008-04-17 Jeffrey Johnson Bone Plate
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* Cited by examiner, † Cited by third party
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EP2689736A3 (en) * 2012-07-27 2014-04-23 Zimmer Spine, Inc. Bone stabilization member with bone screw retention mechanism
US8814912B2 (en) 2012-07-27 2014-08-26 Zimmer Spine, Inc. Bone stabilization member with bone screw retention mechanism
US9414937B2 (en) 2012-07-27 2016-08-16 Zimmer Spine, Inc. Bone stabilization member with bone screw retention mechanism
US9937056B2 (en) 2012-07-27 2018-04-10 Zimmer Spine, Inc. Bone stabilization member with bone screw retention mechanism
EP3622909A1 (en) * 2012-07-27 2020-03-18 Zimmer Spine, Inc. Bone stabilization member with bone screw retention mechanism
EP3050526A4 (en) * 2014-08-11 2017-07-05 Corentec Co., Ltd. Spine fixing apparatus

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