Expandable intervertebral bone grafting device

Abstract

The invention discloses an expandable intervertebral bone grafting device which comprises a pair of distraction forceps, the distraction forceps comprise a first forceps arm and a second forceps arm which are hinged to each other, the far ends of the first forceps arm and the second forceps arm are used for distraction of two adjacent vertebral bodies, and a driving device is arranged between the near ends of the first forceps arm and the second forceps arm. The driving device can drive the near end of the first clamp arm and the near end of the second clamp arm to move close to each other or away from each other. The invention aims to provide the expandable intervertebral bone grafting device which can be used for conveniently expanding intervertebral space.

Description

Technical Field

[0001] The invention relates to the field of medical instruments, and in particular to a device for intervertebral bone grafting. Background Art

[0002] In spinal surgery, in order to increase the stability of the spine, intervertebral bone fusion is often performed while the pedicle screw rod system is fixed. When performing intervertebral bone fusion, the two adjacent vertebrae need to be spread apart so that the bone fusion material can be placed into the intervertebral space. For example, the Chinese invention patent with application number CN201710594287.9, publication date October 20, 2017, and name "Intervertebral Distance Bone Graft", consists of a spreader, a bone graft funnel and a tamping rod. The spreader is used to spread the intervertebral space, and the bone graft funnel and the tamping rod cooperate to implant the broken bones from the spread intervertebral space into the area where bone grafting is required. The spreader includes a first transmission arm, a second transmission arm, a first support arm and a second support arm. The first transmission arm and the first support arm, the second transmission arm and the second support arm are integrally formed. The connection between the first transmission arm and the first support arm and the connection between the second transmission arm and the second support arm are connected through a pin shaft. A locking rack is arranged at the tail of the first transmission arm. The end inclined surface of the second transmission arm cooperates with the teeth on the locking rack. A bone grafting funnel fixing sleeve is arranged above the pin shaft. The bone grafting funnel fixing sleeve is connected to the first transmission arm / the second transmission arm through a universal joint. The first support bar and the second support bar are respectively arranged on the opposite sides of the first transmission arm and the second transmission arm. One end of the first support bar is connected to the locking rack, and the other end is provided with a groove. One end of the second support bar is fixed to the second transmission arm by a screw, and the other end is inserted into the groove of the first support bar. Insert the front end of the expander into the intervertebral space, hold the first transmission arm and the second transmission arm, make the second transmission arm approach the second transmission arm, and separate the first support arm and the second support arm to expand the lumbar intervertebral space outwards. When the gap reaches the predetermined requirement, the end of the second transmission arm is pressed between the teeth of the locking rack and locked. At the same time, the first support bar and the second support bar respectively apply outward force to the first support arm and the second support arm to maintain the stability of the expander. It can be seen that when the above expander expands the lumbar intervertebral space, the doctor uses both hands to operate the first transmission arm and the second transmission arm to move closer to each other, so that the first support arm and the second support arm expand the lumbar intervertebral space. In this process, the doctor's operating force is difficult to control. If too much force is used, the lumbar intervertebral space will exceed the predetermined range. If too little force is used, multiple operations are required, and the process is cumbersome. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an expandable intervertebral bone grafting device which can conveniently expand the intervertebral space.

[0004] The expandable intervertebral bone implant of the present invention comprises a distraction forceps, which comprises a first forceps arm and a second forceps arm hinged to each other, wherein the distal ends of the first forceps arm and the second forceps arm are used to distract two adjacent vertebrae, and a driving device is provided between the proximal ends of the first forceps arm and the second forceps arm, wherein the driving device can drive the proximal ends of the first forceps arm and the second forceps arm to move toward or away from each other.

[0005] The expandable intervertebral bone implant of the present invention, wherein the driving device includes a support frame, the support frame includes a first support plate, a second support plate and a third support plate, the second support plate and the third support plate are both fixedly arranged on the same side of the first support plate, the first support plate, the second support plate and the third support plate together form a U-shaped structure, the second support plate and the third support plate are respectively slidably provided with a first rack and a second rack on the opposite sides of each other, the first rack and the second rack are arranged oppositely and in parallel, a gear is meshed between the first rack and the second rack, the gear is rotatably mounted on the first support plate through a gear shaft, the proximal ends of the first clamp arm and the second clamp arm are both located between the second support plate and the third support plate, the proximal ends of the first clamp arm are provided with a first long through hole arranged along the length direction of the first clamp arm, the proximal ends of the second clamp arm are provided with a second long through hole arranged along the length direction of the second clamp arm, the first rack is fixedly provided with a first connecting shaft, the first rack is slidably hinged to the first long through hole through the first connecting shaft, the second rack is fixedly provided with a second connecting shaft, and the second rack is slidably hinged to the second long through hole through the second connecting shaft.

[0006] The present invention provides an expandable intervertebral bone implant, wherein one end of the gear shaft is fixedly connected to the gear, the other end of the gear shaft passes through the first support plate and extends to the side of the first support plate away from the second support plate and the third support plate, the gear shaft is rotatably mounted on the first support plate via a bearing, and a knob is fixedly provided on the other end of the gear shaft.

[0007] The expandable intervertebral bone implant of the present invention, wherein the driving device includes a support frame, a screw rod is rotatably installed on the support frame, and the screw rod is threadedly connected with a first slider and a second slider, and the support frame is provided with a slide groove arranged along the length direction of the screw rod, and the first slider and the second slider are both slidably arranged in the slide groove. When the screw rod rotates, the first slider and the second slider can slide closer to or away from each other along the slide groove, and the first slider is hinged with a first connecting rod, and the second slider is hinged with a second connecting rod, the proximal end of the first clamp arm is provided with a first long through hole arranged along the length direction of the first clamp arm, and the proximal end of the second clamp arm is provided with a second long through hole arranged along the length direction of the second clamp arm, and the end of the first connecting rod away from the first slider is slidably hinged on the first long through hole, and the end of the second connecting rod away from the second slider is slidably hinged on the second long through hole.

[0008] The present invention provides an expandable intervertebral bone implant, wherein the support frame is a square barrel-shaped structure, the barrel mouth of the support frame is arranged toward the proximal ends of the first clamp arm and the second clamp arm, the four barrel side walls of the support frame are respectively two oppositely arranged first barrel side walls and two oppositely arranged second barrel side walls, the screw is rotatably installed between the two first barrel side walls, the two second barrel side walls are both provided with the sliding groove, one end of the screw passes through the first barrel side wall and extends to the outside of the support frame, and a rotating handle is fixedly provided at one end of the screw located on the outside of the support frame.

[0009] The expandable intervertebral bone implant of the present invention, wherein the driving device includes a support frame, a nut is rotatably installed on the support frame, a screw rod is threadedly connected in the screw hole of the nut, the screw rod is hinged to one end of the first connecting rod and the second connecting rod through a first pin shaft, the first connecting rod and the second connecting rod are respectively located on opposite sides of the screw rod, the first connecting rod and the second connecting rod are both located between the proximal ends of the first clamp arm and the second clamp arm, the other end of the first connecting rod is hinged to the proximal end of the first clamp arm through a second pin shaft, and the other end of the second connecting rod is hinged to the proximal end of the second clamp arm through a third pin shaft.

[0010] The present invention provides an expandable intervertebral bone implant, wherein the support frame includes a first support plate, a second support plate and a third support plate, the second support plate and the third support plate are fixed on the same side of the first support plate with relative spacing, the nut is rotatably mounted on the first support plate, one end of the screw is threadedly connected to the screw hole of the nut, the other end of the screw is located between the second support plate and the third support plate, the other end of the screw is hinged to one end of the first connecting rod and the second connecting rod through a first pin shaft, the first connecting rod and the second connecting rod are both located between the second support plate and the third support plate, and the first clamp arm and the second clamp arm are also both located between the second support plate and the third support plate.

[0011] The present invention provides an expandable intervertebral bone implant, wherein the driving device includes a support frame, a screw rod is threadedly connected to the support frame, the screw rod is rotatably connected to a push-pull rod, the push-pull rod and the screw rod are coaxially arranged, the push-pull rod is hinged to one end of the first connecting rod and the second connecting rod through a first pin shaft, the first connecting rod and the second connecting rod are respectively located on opposite sides of the push-pull rod, the first connecting rod and the second connecting rod are both located between the proximal ends of the first clamp arm and the second clamp arm, the other end of the first connecting rod is hinged to the proximal end of the first clamp arm through a second pin shaft, and the other end of the second connecting rod is hinged to the proximal end of the second clamp arm through a third pin shaft.

[0012] The present invention provides an expandable intervertebral bone implant, wherein the support frame includes a first support plate, a second support plate and a third support plate, the second support plate and the third support plate are fixed on the same side of the first support plate with relative spacing, one end of the screw is threadedly connected to the first support plate, the other end of the screw is located between the second support plate and the third support plate, the other end of the screw is rotatably connected to one end of a push-pull rod, the other end of the push-pull rod is hinged to one end of the first connecting rod and the second connecting rod through a first pin shaft, and the push-pull rod, the first connecting rod, the second connecting rod, the first clamp arm and the second clamp arm are all located between the second support plate and the third support plate.

[0013] The expandable intervertebral bone implant of the present invention, wherein the other end of the screw is provided with a cylindrical slot, the slot is coaxially arranged with the screw, one end of the push-pull rod is provided with a cylindrical block, the block is coaxially arranged with the push-pull rod, and the block is engaged in the slot, or

[0014] A cylindrical clamping block is disposed at the other end of the screw rod, and the clamping block is coaxially arranged with the screw rod. A cylindrical clamping groove is disposed at one end of the push-pull rod, and the clamping block is engaged in the clamping groove.

[0015] The expandable intervertebral bone grafting device of the present invention is different from the prior art in that when the expandable intervertebral bone grafting device of the present invention is used, the distal ends of the first and second clamp arms of the expansion forceps in a closed state are inserted into the gap between two adjacent vertebrae, and then the proximal ends of the first and second clamp arms are driven by a driving device to move away from each other. Since the first and second clamp arms are hinged to each other, when the proximal ends of the first and second clamp arms move away from each other, the distal ends of the first and second clamp arms also move away from each other, so the distal ends of the first and second clamp arms push the two adjacent vertebrae to move away from each other, so that the intervertebral space between the two adjacent vertebrae is expanded, and then the intervertebral space can be bone-grafted. It can be seen that the present invention can conveniently expand the intervertebral space.

[0016] The present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of the first embodiment of the expandable intervertebral bone implant of the present invention (the expander is in a closed state);

[0018] Figure 2 This is a front view of the expandable intervertebral bone implant embodiment 1 of the present invention with the third support plate hidden (the expander is in a closed state);

[0019] Figure 3 for Figure 2 A partial enlarged view of the middle support frame;

[0020] Figure 4 For along Figure 3 Sectional view along line AA;

[0021] Figure 5 for Figure 1 Left view of

[0022] Figure 6 for Figure 5 A partial enlarged view of point B in the middle;

[0023] Figure 7 for Figure 5 A partial enlarged view of point C in the middle;

[0024] Figure 8 This is a front view of the expandable intervertebral bone implant embodiment 1 of the present invention with the third support plate hidden (the expander is in an expanded state);

[0025] Fig. 9 for Figure 8 A partial enlarged view of the middle support frame;

[0026] Fig.10 The expandable intervertebral bone implant of the present invention is used in the first embodiment Figure 1 ;

[0027] Fig.11 The expandable intervertebral bone implant of the present invention is used in the first embodiment Figure 2 ;

[0028] Fig.12 The expandable intervertebral bone implant of the present invention is used in the first embodiment Figure 3 ;

[0029] Fig.13 It is a front view of the second embodiment of the expandable intervertebral bone implant of the present invention (the expander is in a closed state);

[0030] Fig.14 This is a front view of the expandable intervertebral bone implant embodiment 2 of the present invention after hiding a second barrel side wall (the expansion clamp is in a closed state);

[0031] Fig.15 For along Fig.13 Sectional view along the mid-DD line;

[0032] Fig.16 for Fig.15 A partial enlarged view of point E in the middle;

[0033] Fig.17 This is a front view of the expandable intervertebral bone implant embodiment 2 of the present invention after hiding a second barrel side wall (the expansion clamp is in an expanded state);

[0034] Fig.18It is a front view of the third embodiment of the expandable intervertebral bone implant of the present invention (the expander is in a closed state);

[0035] Fig.19 For along Fig.18 Sectional view along the midline FF (the lower part of the spreader is hidden for clarity of view);

[0036] Fig. 20 It is a front view of the third embodiment of the expandable intervertebral bone implant of the present invention (the expander is in the expander state);

[0037] Fig.21 It is a front view of the fourth embodiment of the expandable intervertebral bone implant of the present invention (the expander is in a closed state);

[0038] Fig. 22 for Fig.21 A partial enlarged view of the G in the middle;

[0039] Fig.23 It is a front view of the fourth embodiment of the expandable intervertebral bone implant of the present invention (the expander is in the expander state). DETAILED DESCRIPTION

[0040] It should be noted that, in the present invention, the “distal end” and the “proximal end” are relative to the operator, that is, the end away from the operator is the “distal end”, and the end close to the operator is the “proximal end”.

[0041] Embodiment 1

[0042] like Figure 1 As shown, combined with Figure 2-12As shown, the expandable intervertebral bone implant of the present invention includes a distraction forceps 7, which includes a first forceps arm 4 and a second forceps arm 5 hinged to each other, the first forceps arm 4 and the second forceps arm 5 together forming an X shape, the middle parts of the first forceps arm 4 and the second forceps arm 5 are hinged by a pin 6, that is, the pin 6 is located between the distal end and the proximal end of the first forceps arm 4 and the second forceps arm 5, so that when the proximal ends of the first forceps arm 4 and the second forceps arm 5 are moved closer to each other, the distal ends of the first forceps arm 4 and the second forceps arm 5 are also moved closer to each other until the distal ends of the first forceps arm 4 and the second forceps arm 5 are fitted to each other, and the distraction forceps 7 is in a closed state; conversely, when the proximal ends of the first forceps arm 4 and the second forceps arm 5 are moved away from each other, the distal ends of the first forceps arm 4 and the second forceps arm 5 are also moved away from each other until the distal ends of the first forceps arm 4 and the second forceps arm 5 move to a suitable distance from each other, and the distraction forceps 7 is in an open state. The distal ends of the first clamp arm 4 and the second clamp arm 5 are used to spread apart two adjacent vertebrae 20. A driving device is provided between the proximal ends of the first clamp arm 4 and the second clamp arm 5. The driving device can drive the proximal ends of the first clamp arm 4 and the second clamp arm 5 to move toward or away from each other. When the driving device drives the proximal ends of the first clamp arm 4 and the second clamp arm 5 to move toward each other, the distal ends of the first clamp arm 4 and the second clamp arm 5 also move toward each other until the spreading clamp 7 reaches a closed state; conversely, when the driving device drives the proximal ends of the first clamp arm 4 and the second clamp arm 5 to move away from each other, the distal ends of the first clamp arm 4 and the second clamp arm 5 also move away from each other until the spreading clamp 7 reaches an open state.

[0043] like Figure 1 , 2 As shown in Figures 8, 10, 11 and 12, in order to facilitate the insertion of the distal ends of the first clamp arm 4 and the second clamp arm 5 of the closed state spreading clamp 7 into the gap between two adjacent vertebral bodies 20, the distal ends of the first clamp arm 4 and the second clamp arm 5 are designed to be symmetrical semi-conical structures. In this way, when the spreading clamp 7 is in the closed state, the distal ends of the first clamp arm 4 and the second clamp arm 5 jointly form a conical structure, so that the distal ends of the first clamp arm 4 and the second clamp arm 5 can be easily inserted into the gap between two adjacent vertebral bodies 20.

[0044] like Figure 5 , 7As shown, the specific hinge connection method of the first clamp arm 4 and the second clamp arm 5 is as follows: the first clamp arm 4 is provided with a hinge through hole 19, the second clamp arm 5 is inserted in the hinge through hole 19, and the second clamp arm 5 is hinged in the hinge through hole 19 through the pin 6. Of course, the hinge through hole 19 can also be provided on the second clamp arm 5, and the first clamp arm 4 is inserted in the hinge through hole 19, and then the first clamp arm 4 is hinged in the hinge through hole 19 through the pin 6. In addition, the hinge through hole 19 can also be not provided on the first clamp arm 4 or the second clamp arm 5, but the first clamp arm 4 and the second clamp arm 5 are just pressed against each other, and then hinged by the pin 6.

[0045] like Figure 1-6 As shown in , 8-9, the expandable intervertebral bone implant of the present invention, wherein the driving device includes a support frame 1, the support frame 1 includes a first support plate 9, a second support plate 8 and a third support plate 3, the second support plate 8 and the third support plate 3 are both fixedly arranged on the same side of the first support plate 9, and the first support plate 9, the second support plate 8 and the third support plate 3 together form a U-shaped structure. The first support plate 9, the second support plate 8 and the third support plate 3 are all rectangular plate-shaped structures, one long side of the second support plate 8 is fixed to one long side of the first support plate 9, and one long side of the third support plate 3 is fixed to the other long side of the first support plate 9. A first rack 12 and a second rack 13 are slidably provided on opposite sides of the second support plate 8 and the third support plate 3, respectively. The first rack 12 is arranged along the length direction of the second support plate 8, and the second rack 13 is arranged along the length direction of the third support plate 3. The first rack 12 and the second rack 13 are arranged opposite to and in parallel. A gear 17 is meshed between the first rack 12 and the second rack 13, and the gear 17 is rotatably mounted on the first support plate 9 through the gear shaft 11. The proximal ends of the first clamp arm 4 and the second clamp arm 5 are both located between the second support plate 8 and the third support plate 3. The proximal end of the first clamp arm 4 is provided with a first long through hole 15 arranged along the length direction of the first clamp arm 4, and the proximal end of the second clamp arm 5 is provided with a second long through hole 16 arranged along the length direction of the second clamp arm 5. A first connecting shaft 14 is fixedly provided on the first rack 12, and the first rack 12 is slidably hinged to the first long through hole 15 through the first connecting shaft 14. A second connecting shaft 18 is fixedly provided on the second rack 13, and the second rack 13 is slidably hinged to the second long through hole 16 through the second connecting shaft 18.

[0046] like Figure 3 , 4As shown in , 6, a first slide groove 10 is provided on the side of the second support plate 8 opposite to the third support plate 3, the first slide groove 10 is arranged along the length direction of the second support plate 8, and the first rack 12 is slidably set in the first slide groove 10; a second slide groove 49 is provided on the side of the third support plate 3 opposite to the second support plate 8, the second slide groove 49 is arranged along the length direction of the third support plate 3, and the second rack 13 is slidably set in the second slide groove 49.

[0047] like Figure 3 , 4 As shown, the expandable intervertebral bone implant of the present invention, wherein one end (the lower end shown in the figure) of the gear shaft 11 is fixedly connected to the gear 17, the other end (the upper end shown in the figure) of the gear shaft 11 passes through the first support plate 9 and extends to the side of the first support plate 9 away from the second support plate 8 and the third support plate 3, the second support plate 8 and the third support plate 3 are fixedly arranged on the lower side of the first support plate 9, the upper end of the gear shaft 11 extends to the upper side of the first support plate 9, the gear shaft 11 is rotatably mounted on the first support plate 9 through a bearing, and the other end (the upper end shown in the figure) of the gear shaft 11 is fixedly provided with a knob 2. When the knob 2 is turned, the gear shaft 11 and the gear 17 rotate together with the knob 2. The knob 2 is provided to facilitate the operator to rotate the gear 17.

[0048] like Figure 4 As shown, combined with Figure 2 , 3 As shown, when the gear shaft 11 is rotated counterclockwise by the knob 2, the gear 17 also rotates counterclockwise, so that driven by the gear 17, the first rack 12 slides to the left along the first slide groove 10, and the first rack 12 pushes the proximal end of the first clamp arm 4 to move to the left, and at the same time, the second rack 13 slides to the right along the second slide groove 49, and the second rack 13 pushes the proximal end of the second clamp arm 5 to move to the right, that is, the proximal ends of the first clamp arm 4 and the second clamp arm 5 move away from each other, and the distal ends of the first clamp arm 4 and the second clamp arm 5 also move away from each other, until the open clamp 7 reaches the open state, as shown in FIG. Figure 8 , 9 Afterwards, when the gear shaft 11 is rotated clockwise by the knob 2, the gear 17 also rotates clockwise, and the first rack 12 slides rightward along the first slide groove 10 driven by the gear 17, and the first rack 12 pulls the proximal end of the first clamp arm 4 to move rightward, and at the same time, the second rack 13 slides leftward along the second slide groove 49, and the second rack 13 pulls the proximal end of the second clamp arm 5 to move leftward, that is, the proximal ends of the first clamp arm 4 and the second clamp arm 5 move closer to each other, and the distal ends of the first clamp arm 4 and the second clamp arm 5 also move closer to each other, until the open clamp 7 reaches a closed state, as shown in FIG. Figure 2 , 3 , as shown in Figure 4.

[0049] like Figure 3 , 9 As shown, when the first rack 12 and the second rack 13 push the proximal ends of the first clamp arm 4 and the second clamp arm 5 to move away from each other: the first rack 12 slides linearly to the left, and the proximal end of the first clamp arm 4 moves in a circular motion to the lower left around the hinge point of the two clamp arms. Since the first rack 12 is slidably hinged on the first long through hole 15 through the first connecting shaft 14, during this process, the first connecting shaft 14 can slide relative to the first long through hole 15 and the proximal end of the first clamp arm 4 can rotate around the first connecting shaft 14. Specifically, the first connecting shaft 14 slides from bottom to top along the first long through hole 15 and the proximal end of the first clamp arm 4 rotates a certain angle in the counterclockwise direction around the first connecting shaft 14 to adapt to the first rack 1 2 and the proximal end of the first clamp arm 4; at the same time, the second rack 13 slides linearly to the right, and the proximal end of the second clamp arm 5 makes a circular motion to the lower right around the hinge point of the two clamp arms. Since the second rack 13 is slidably hinged on the second long through hole 16 through the second connecting shaft 18, during this process, the second connecting shaft 18 can slide relative to the second long through hole 16 and the proximal end of the second clamp arm 5 can rotate around the second connecting shaft 18. Specifically, the second connecting shaft 18 slides from bottom to top along the second long through hole 16 and the proximal end of the second clamp arm 5 rotates around the second connecting shaft 18 in the clockwise direction at a certain angle to adapt to the change in the relative position between the second rack 13 and the proximal end of the second clamp arm 5.

[0050] like Fig. 9 , 3As shown, when the first rack 12 and the second rack 13 pull the proximal ends of the first clamp arm 4 and the second clamp arm 5 to move closer to each other: the first rack 12 slides linearly to the right, and the proximal end of the first clamp arm 4 moves in a circular motion to the upper right around the hinge point of the two clamp arms. Since the first rack 12 is slidably hinged on the first long through hole 15 through the first connecting shaft 14, during this process, the first connecting shaft 14 can slide relative to the first long through hole 15 and the proximal end of the first clamp arm 4 can rotate around the first connecting shaft 14. Specifically, the first connecting shaft 14 slides from top to bottom along the first long through hole 15 and the proximal end of the first clamp arm 4 rotates a certain angle in the clockwise direction around the first connecting shaft 14 to adapt to the first rack 1 2 and the proximal end of the first clamp arm 4; at the same time, the second rack 13 slides linearly to the left, and the proximal end of the second clamp arm 5 makes a circular motion to the upper left around the hinge point of the two clamp arms. Since the second rack 13 is slidably hinged on the second long through hole 16 through the second connecting shaft 18, during this process, the second connecting shaft 18 can slide relative to the second long through hole 16 and the proximal end of the second clamp arm 5 can rotate around the second connecting shaft 18. Specifically, the second connecting shaft 18 slides from top to bottom along the second long through hole 16 and the proximal end of the second clamp arm 5 rotates around the second connecting shaft 18 in the counterclockwise direction at a certain angle to adapt to the change in the relative position between the second rack 13 and the proximal end of the second clamp arm 5.

[0051] like Figure 10-12As shown, when the expandable intervertebral bone graft of the present invention is used, the distal ends of the first clamp arm 4 and the second clamp arm 5 of the expansion clamp 7 in a closed state are inserted into the gap between two adjacent vertebral bodies 20, and then the proximal ends of the first clamp arm 4 and the second clamp arm 5 are driven by the driving device to move away from each other. Specifically, the surgeon holds the support frame 1 with one hand and turns the knob 2 with the other hand to allow the gear 17 to drive the first rack 12 and the second rack 13 to slide away from each other, so that the first rack 12 and the second rack 13 push the proximal ends of the first clamp arm 4 and the second clamp arm 5 to move away from each other. Since the first clamp arm 4 and the second clamp arm 5 are hinged to each other, when the proximal ends of the first clamp arm 4 and the second clamp arm 5 move away from each other, the distal ends of the first clamp arm 4 and the second clamp arm 5 also move away from each other, so the distal ends of the first clamp arm 4 and the second clamp arm 5 push the two adjacent vertebrae 20 to move away from each other, so that the intervertebral space between the two adjacent vertebrae 20 is stretched open, and when stretched to the required distance, the knob 2 is stopped, and then the intervertebral space can be bone-grafted. After the bone-grafting operation is completed, the bone grafting device is withdrawn, the bone grafting device is cleaned and disinfected, and then the knob 2 is reversed to allow the first rack 12 and the second rack 13 to slide toward each other, so that the first rack 12 and the second rack 13 pull the proximal ends of the first clamp arm 4 and the second clamp arm 5 to move toward each other, and the distal ends of the first clamp arm 4 and the second clamp arm 5 also move toward each other, until the stretched clamp 7 is closed again, waiting for the next operation. It can be seen that the present invention can conveniently expand the intervertebral space and can infinitely adjust the size of the gap between two adjacent vertebral bodies 20 during the expansion process, that is, the intervertebral space can be adjusted to a suitable surgical distance, which is neither too large nor too small.

[0052] Embodiment 2

[0053] like Figure 13-17 As shown, the difference between this embodiment and the first embodiment lies in the structure of the driving device. In this embodiment, the specific structure of the driving device is as follows.

[0054] The driving device includes a support frame 1, on which a screw rod 22 is rotatably mounted via a bearing, and a first slider 29 and a second slider 31 are threadedly connected to the screw rod 22, and a slide groove 30 is provided on the support frame 1, and the first slider 29 and the second slider 31 are both slidably arranged in the slide groove 30. When the screw rod 22 rotates, the first slider 29 and the second slider 31 can slide closer to or away from each other along the slide groove 30, and the first slider 29 is hinged with a first connecting rod 23, and the second slider 31 is hinged with a second connecting rod 26. The proximal end of the first clamp arm 4 is provided with a first long through hole 15 arranged along the length direction of the first clamp arm 4, and the proximal end of the second clamp arm 5 is provided with a second long through hole 16 arranged along the length direction of the second clamp arm 5, and the end of the first connecting rod 23 away from the first slider 29 is slidably hinged on the first long through hole 15, and the end of the second connecting rod 26 away from the second slider 31 is slidably hinged on the second long through hole 16.

[0055] A first thread segment and a second thread segment are respectively provided at both ends of the screw rod 22, and the thread rotation directions of the first thread segment and the second thread segment are opposite. The first slider 29 is threadedly connected to the first thread segment, and the second slider 31 is threadedly connected to the second thread segment. In this way, when the screw rod 22 rotates, since the first slider 29 and the second slider 31 are restricted by the slide groove 30, the two sliders will not rotate with the screw rod 22, but can only slide closer to or away from each other along the slide groove 30.

[0056] The support frame 1 is a square barrel-shaped structure, and the barrel mouth of the support frame 1 is arranged toward the proximal ends of the first clamp arm 4 and the second clamp arm 5. The four barrel side walls of the support frame 1 are respectively two oppositely arranged first barrel side walls 28 and two oppositely arranged second barrel side walls 25. The screw 22 is rotatably installed between the two first barrel side walls 28 through a bearing, and the two second barrel side walls 25 are both provided with the slide groove 30. One end of the screw 22 passes through the first barrel side wall 28 and extends to the outside of the support frame 1. A rotating handle 21 is fixedly provided at one end of the screw 22 located on the outside of the support frame 1.

[0057] like Fig.14 , 17As shown, the barrel mouth of the support frame 1 is arranged downward, and the proximal ends of the first clamp arm 4 and the second clamp arm 5 are arranged upward, and the two are opposite, that is, the barrel mouth of the support frame 1 is arranged toward the proximal ends of the two clamp arms. The two ends of the screw rod 22 are rotatably mounted on the two first barrel side walls 28 through bearings. The upper end of the first connecting rod 23 is hinged on the first slider 29 through the first upper pin 32, and the lower end of the first connecting rod 23 (that is, the end of the first connecting rod 23 away from the first slider 29) is slidably hinged on the first long through hole 15 through the first lower pin 24, and the first lower pin 24 is fixedly arranged at the lower end of the first connecting rod 23. The upper end of the second connecting rod 26 is hinged on the second slider 31 through the second upper pin 33, and the lower end of the second connecting rod 26 (that is, the end of the second connecting rod 26 away from the second slider 31) is slidably hinged on the second long through hole 16 through the second lower pin 27, and the second lower pin 27 is fixedly arranged at the lower end of the second connecting rod 26.

[0058] like Fig.14 , 17 As shown, when the screw rod 22 is rotated by rotating the handle 21, the first slider 29 and the second slider 31 slide away from each other, that is, the first slider 29 slides to the left, and the second slider 31 slides to the right. When the first slider 29 slides to the left, the first slider 29 drives the proximal end of the first clamp arm 4 to make a circular motion to the lower left around the hinge point of the two clamp arms through the first connecting rod 23. During this process, the first lower pin 24 slides from bottom to top along the first long through hole 15 and at the same time, the first connecting rod 23 and the proximal end of the first clamp arm 4 rotate relatively around the first lower pin 24 to adapt to the change in the relative position between the first connecting rod 23 and the proximal end of the first clamp arm 4; when the second slider 31 slides to the right, the second slider 31 drives the proximal end of the second clamp arm 5 to make a circular motion to the lower right around the hinge point of the two clamp arms through the second connecting rod 26. During this process, the second lower pin 27 slides from bottom to top along the second long through hole 16 and at the same time, the second connecting rod 26 and the proximal end of the second clamp arm 5 rotate relatively around the second lower pin 27 to adapt to the change in the relative position between the second connecting rod 26 and the proximal end of the second clamp arm 5. When the proximal end of the first clamp arm 4 moves to the left and the proximal end of the second clamp arm 5 moves to the right, that is, when the proximal ends of the two clamp arms move away from each other, the distal ends of the two clamp arms also move away from each other until the distal ends of the two clamp arms move to the appropriate positions, and then the opening clamp 7 changes from a closed state to an open state.

[0059] like Fig.17 , 14As shown, when the screw rod 22 is rotated by rotating the handle 21, the first slider 29 and the second slider 31 slide toward each other, that is, the first slider 29 slides to the right, and the second slider 31 slides to the left. When the first slider 29 slides to the right, the first slider 29 drives the proximal end of the first clamp arm 4 to make a circular motion to the upper right around the hinge point of the two clamp arms through the first connecting rod 23. During this process, the first lower pin 24 slides from top to bottom along the first long through hole 15 and at the same time, the first connecting rod 23 and the proximal end of the first clamp arm 4 rotate relative to each other around the first lower pin 24 to adapt to the change in the relative position between the first connecting rod 23 and the proximal end of the first clamp arm 4; when the second slider 31 slides to the left, the second slider 31 drives the proximal end of the second clamp arm 5 to make a circular motion to the upper left around the hinge point of the two clamp arms through the second connecting rod 26. During this process, the second lower pin 27 slides from top to bottom along the second long through hole 16 and at the same time, the second connecting rod 26 and the proximal end of the second clamp arm 5 rotate relative to each other around the second lower pin 27 to adapt to the change in the relative position between the second connecting rod 26 and the proximal end of the second clamp arm 5. When the proximal end of the first clamp arm 4 moves to the right and the proximal end of the second clamp arm 5 moves to the left, that is, when the proximal ends of the two clamp arms move toward each other, the distal ends of the two clamp arms also move toward each other until the distal ends of the two clamp arms fit together, and then the opening clamp 7 changes from an open state to a closed state.

[0060] When in use, the surgeon holds the support frame 1 in one hand and rotates the rotating handle 21 in the other hand to allow the distraction forceps 7 to distract the intervertebral space between two adjacent vertebrae 20 for bone grafting. It can be seen that this embodiment is the same as the first embodiment, and both can infinitely adjust the size of the intervertebral space during the distraction forceps 7 distracting the intervertebral space, that is, the intervertebral space can be adjusted to a suitable surgical distance, which is neither too large nor too small.

[0061] Embodiment 3

[0062] like Figure 18-20 As shown, the difference between this embodiment and the first embodiment lies in the structure of the driving device. In this embodiment, the specific structure of the driving device is as follows.

[0063] The driving device includes a support frame 1, on which a nut 37 is rotatably installed. A screw rod 38 is threadedly connected in the screw hole of the nut 37. The screw rod 38 is hinged to one end of a first connecting rod 40 and a second connecting rod 42 through a first pin shaft 39. The first connecting rod 40 and the second connecting rod 42 are respectively located on opposite sides of the screw rod 38. The first connecting rod 40 and the second connecting rod 42 are both located between the proximal ends of the first clamp arm 4 and the second clamp arm 5. The other end of the first connecting rod 40 is hinged to the proximal end of the first clamp arm 4 through a second pin shaft 41, and the other end of the second connecting rod 42 is hinged to the proximal end of the second clamp arm 5 through a third pin shaft 43.

[0064] The support frame 1 includes a first support plate 35, a second support plate 34 and a third support plate 36. The second support plate 34 and the third support plate 36 are fixed at a relative interval on the same side of the first support plate 35. The nut 37 is rotatably mounted on the first support plate 35 through a bearing. One end of the screw rod 38 is threadedly connected to the screw hole of the nut 37, and the other end of the screw rod 38 is located between the second support plate 34 and the third support plate 36. The other end of the screw rod 38 is hinged to one end of the first connecting rod 40 and the second connecting rod 42 through a first pin shaft 39. The first connecting rod 40 and the second connecting rod 42 are both located between the second support plate 34 and the third support plate 36. The first clamp arm 4 and the second clamp arm 5 are also both located between the second support plate 34 and the third support plate 36.

[0065] like Fig.18 , 20 As shown, the first support plate 35 is arranged in the horizontal direction, and the second support plate 34 and the third support plate 36 are fixed on the lower side of the first support plate 35. The screw rod 38 is also arranged in the vertical direction, and the upper end of the screw rod 38 is threadedly connected to the screw hole of the nut 37, and the lower end of the screw rod 38 is hinged to one end of the first connecting rod 40 and the second connecting rod 42 through the first pin shaft 39.

[0066] like Fig.19 As shown, in order to allow the screw rod 38 to push and pull the proximal end of the first clamp arm 4 in a balanced manner through the first connecting rod 40, the first connecting rod 40 is designed as a parallel double connecting rod structure. Similarly, in order to allow the screw rod 38 to push and pull the proximal end of the second clamp arm 5 in a balanced manner through the second connecting rod 42, the second connecting rod 42 is also designed as a parallel double connecting rod structure. Fig.18 , 20 As shown, in order to facilitate the rotation of the nut 37, a support ear is provided on the nut 37.

[0067] like Fig.18 As shown, the spreading pliers 7 is in a closed state, at which time the first connecting rod 40 and the second connecting rod 42 are arranged in a V shape, that is, the first pin 39 is located below the second pin 41 and the third pin 43, and the second pin 41 and the third pin 43 are located at the same horizontal height. The lower ends of the first connecting rod 40 and the second connecting rod 42 are both hinged to the lower end of the screw rod 38 through the first pin 39, the upper end of the first connecting rod 40 is hinged to the proximal end of the first pliers arm 4 through the second pin 41, and the upper end of the second connecting rod 42 is hinged to the upper end of the second pliers arm 5 through the third pin 43.

[0068] When in use, the distal end of the distraction clamp 7 in a closed state is inserted into the gap between two adjacent vertebrae 20. The operator holds the support frame 1 by hand or fixes the support frame 1 on the support platform, and then rotates the nut 37. Since the screw rod 38 is connected to the distraction clamp 7 through a connecting rod, and the distal end of the distraction clamp 7 is inserted into the intervertebral space, the screw rod 38 will not rotate with the nut 37, but will only move up and down relative to the nut 37. When the nut 37 is rotated to move the screw rod 38 upward, the lower ends of the first connecting rod 40 and the second connecting rod 42 move upward along with the screw rod 38, the upper end of the first connecting rod 40 pushes the proximal end of the first clamp arm 4 to the left, and the upper end of the second connecting rod 42 pushes the upper end of the second clamp arm 5 to the right, that is, the screw rod 38 pushes the proximal ends of the first clamp arm 4 and the second clamp arm 5 to move away from each other through the first connecting rod 40 and the second connecting rod 42, and at the same time, the distal ends of the first clamp arm 4 and the second clamp arm 5 also move away from each other until the distal ends of the two clamp arms move to a suitable position, so that the open clamp 7 changes from a closed state to an open state (see Fig.18 , 20 As shown), the intervertebral space can be expanded to facilitate the bone grafting operation. After the bone grafting operation is completed, the bone grafting device is withdrawn, cleaned and disinfected, and then the support frame 1 is fixed, and the expansion forceps 7 are fixed so that it will not rotate with the screw rod 38. Then the nut 37 is turned to allow the screw rod 38 to move downward. The lower ends of the first connecting rod 40 and the second connecting rod 42 both move downward with the screw rod 38. The upper end of the first connecting rod 40 pulls the proximal end of the first clamp arm 4 to the right, and the upper end of the second connecting rod 42 pulls the proximal end of the second clamp arm 5 to the left, that is, the screw rod 38 pulls the proximal ends of the first clamp arm 4 and the second clamp arm 5 through the first connecting rod 40 and the second connecting rod 42 to move closer to each other, and at the same time, the distal ends of the first clamp arm 4 and the second clamp arm 5 also move closer to each other until the distal ends of the two clamp arms fit together, so that the expansion forceps 7 changes from an open state to a closed state (see Fig. 20 , 18 for use in the next surgery.

[0069] This embodiment is the same as the first embodiment, and both can infinitely adjust the size of the intervertebral space when the distraction forceps 7 distract the intervertebral space, that is, the intervertebral space can be adjusted to a suitable surgical distance, which is neither too large nor too small.

[0070] Embodiment 4

[0071] like Figure 21-23 As shown, the difference between this embodiment and the first embodiment lies in the structure of the driving device. In this embodiment, the specific structure of the driving device is as follows.

[0072] The driving device includes a support frame 1, on which a screw rod 45 is threadedly connected. The screw rod 45 is rotatably connected to a push-pull rod 46. The push-pull rod 46 is coaxially arranged with the screw rod 45. The push-pull rod 46 is hinged to one end of the first connecting rod 40 and the second connecting rod 42 through a first pin shaft 39. The first connecting rod 40 and the second connecting rod 42 are respectively located on opposite sides of the push-pull rod 46. The first connecting rod 40 and the second connecting rod 42 are both located between the proximal ends of the first clamp arm 4 and the second clamp arm 5. The other end of the first connecting rod 40 is hinged to the proximal end of the first clamp arm 4 through a second pin shaft 41, and the other end of the second connecting rod 42 is hinged to the proximal end of the second clamp arm 5 through a third pin shaft 43.

[0073] The support frame 1 includes a first support plate 35, a second support plate 34 and a third support plate 36. The second support plate 34 and the third support plate 36 are fixed at a relative interval on the same side of the first support plate 35. One end of the screw rod 45 is threadedly connected to the first support plate 35, and the other end of the screw rod 45 is located between the second support plate 34 and the third support plate 36. The other end of the screw rod 45 is rotatably connected to one end of a push-pull rod 46. The other end of the push-pull rod 46 is hinged to one end of the first connecting rod 40 and the second connecting rod 42 through a first pin shaft 39. The push-pull rod 46, the first connecting rod 40, the second connecting rod 42, the first clamp arm 4 and the second clamp arm 5 are all located between the second support plate 34 and the third support plate 36.

[0074] like Fig.21 , 23 As shown, the first support plate 35 is arranged in the horizontal direction, and the second support plate 34 and the third support plate 36 are fixed on the lower side of the first support plate 35. The screw rod 45 is also arranged in the vertical direction, the upper end of the screw rod 45 is threadedly connected to the first support plate 35, the lower end of the screw rod 45 is rotatably connected to the upper end of the push-pull rod 46, the lower end of the push-pull rod 46 is hinged to one end of the two connecting rods through the first pin 39, and the other ends of the two connecting rods are respectively hinged to the proximal ends of the two clamp arms.

[0075] In order to enable the push-pull rod 46 to push and pull the proximal end of the first clamp arm 4 in a balanced manner through the first connecting rod 40, the first connecting rod 40 is designed as a parallel double connecting rod structure. Similarly, in order to enable the push-pull rod 46 to push and pull the proximal end of the second clamp arm 5 in a balanced manner through the second connecting rod 42, the second connecting rod 42 is also designed as a parallel double connecting rod structure.

[0076] The upper end of the screw rod 45 extends to the top of the first support plate 35 . In order to facilitate the rotation of the screw rod 45 , a knob 44 is fixedly provided above the screw rod 45 . The screw rod 45 can be rotated by rotating the knob 44 .

[0077] like Fig. 22As shown, the specific manner in which the other end (lower end) of the screw rod 45 is rotatably connected to one end (upper end) of the push-pull rod 46 is as follows: a cylindrical clamping groove 47 is provided at the other end of the screw rod 45, the clamping groove 47 is coaxially arranged with the screw rod 45, one end of the push-pull rod 46 is provided with a cylindrical clamping block 48, the clamping block 48 is coaxially arranged with the push-pull rod 46, and the clamping block 48 is engaged in the clamping groove 47, or a cylindrical clamping block 48 is provided at the other end of the screw rod 45, the clamping block 48 is coaxially arranged with the screw rod 45, one end of the push-pull rod 46 is provided with a cylindrical clamping groove 47, the clamping groove 47 is coaxially arranged with the push-pull rod 46, and the clamping block 48 is engaged in the clamping groove 47. In this way, the screw rod 45 can rotate relative to the push-pull rod 46, but the two will not be separated.

[0078] like Fig. 22 As shown, when a cylindrical slot 47 is provided at the lower end of the screw 45 and a cylindrical clamping platform is provided at the upper end of the push-pull rod 46, in order to prevent the clamping block 48 from being disengaged from the slot 47, an annular clamping platform can be provided at the notch of the slot 47, and an annular groove matching the annular clamping platform is provided in the circumference of the clamping block 48, so that the annular clamping platform is engaged in the annular groove, so that the slot 47 can rotate relative to the clamping block 48 but the clamping block 48 will not be disengaged from the slot 47, that is, the screw 45 can rotate relative to the push-pull rod 46 but the two will not be disengaged. When the annular clamping platform is specifically provided, the annular clamping platform can be designed independently of the screw 45, and the annular clamping platform can be designed as two semi-annular clamping platforms. After the clamping block 48 is placed in the slot 47, the two semi-annular clamping platforms are respectively fixed on the lower end surface of the screw 45, and the two semi-annular clamping platforms are assembled into the annular clamping platform, and the annular clamping platform is engaged in the annular groove of the clamping block 48.

[0079] When in use, the knob 44 is turned, the screw rod 45 rotates, and the push-pull rod 46 does not rotate (because the push-pull rod 46 is connected to the distraction forceps 7 through a connecting rod, and the distal end of the distraction forceps 7 is inserted in the intervertebral space, so the push-pull rod 46 does not rotate). Since the screw rod 45 and the push-pull rod 46 are rotatably connected, the connection structure can adapt to the rotation of the screw rod 45 relative to the push-pull rod 46. Since the screw rod 45 is threadedly connected to the first support plate 35, the screw rod 45 will move up and down while rotating. Fig.21 , 23 As shown, when the screw rod 45 moves upward, the screw rod 45 pulls the push-pull rod 46 to move upward as well, and the push-pull rod 46 opens the opening clamp 7 through the first connecting rod 40 and the second connecting rod 42. Conversely, when the screw rod 45 moves downward, the screw rod 45 pushes the push-pull rod 46 to move downward as well, and the push-pull rod 46 closes the opening clamp 7 through the first connecting rod 40 and the second connecting rod 42.

[0080] It can be seen that the difference between this embodiment and the third embodiment is that the structure of driving the first connecting rod 40 and the second connecting rod 42 is different, that is: in this embodiment, the first connecting rod 40 and the second connecting rod 42 are driven by the knob 44, the screw rod 45 (the screw rod 45 is threadedly connected to the first support plate 35), and the push-pull rod 46, so that the opening pliers 7 are opened and closed; in the third embodiment, the first connecting rod 40 and the second connecting rod 42 are driven by the nut 37 (the nut 37 is rotatably mounted on the first support plate 35) and the screw rod 38, so that the opening pliers 7 are opened and closed. In addition, the structure of this embodiment is exactly the same as that of the third embodiment, that is, when this embodiment is used, except that the method of driving the first connecting rod 40 and the second connecting rod 42 is different from that of the third embodiment, the rest of the usage is the same.

[0081] It should be noted that the directions or positional relationships indicated by terms such as “center”, “up”, “down”, “front”, “back”, “left”, “right”, and “middle” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0082] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0083] The embodiments described above are merely descriptions of preferred implementation modes of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An expandable intervertebral bone graft, characterized in that: The invention comprises a spreading forceps, which comprises a first forceps arm and a second forceps arm hinged to each other, wherein the distal ends of the first forceps arm and the second forceps arm are used to spread apart two adjacent vertebrae, and a driving device is provided between the proximal ends of the first forceps arm and the second forceps arm, and the driving device can drive the proximal ends of the first forceps arm and the second forceps arm to move toward or away from each other.

2. The expandable intervertebral bone graft according to claim 1, characterized in that: The driving device includes a support frame, the support frame includes a first support plate, a second support plate and a third support plate, the second support plate and the third support plate are both fixedly arranged on the same side of the first support plate, the first support plate, the second support plate and the third support plate together form a U-shaped structure, and a first rack and a second rack are slidably provided on the opposite sides of the second support plate and the third support plate, respectively, the first rack and the second rack are arranged oppositely and in parallel, a gear is meshed between the first rack and the second rack, and the gear is rotatably mounted on the first support plate through a gear shaft, the proximal ends of the first clamp arm and the second clamp arm are both located between the second support plate and the third support plate, the proximal ends of the first clamp arm are provided with a first long through hole arranged along the length direction of the first clamp arm, and the proximal ends of the second clamp arm are provided with a second long through hole arranged along the length direction of the second clamp arm, a first connecting shaft is fixedly provided on the first rack, the first rack is slidably hinged to the first long through hole through the first connecting shaft, a second connecting shaft is fixedly provided on the second rack, and the second rack is slidably hinged to the second long through hole through the second connecting shaft.

3. The expandable intervertebral bone graft according to claim 2, characterized in that: One end of the gear shaft is fixedly connected to the gear, and the other end of the gear shaft extends through the first support plate to the side of the first support plate away from the second support plate and the third support plate. The gear shaft is rotatably mounted on the first support plate through a bearing, and a knob is fixedly provided on the other end of the gear shaft.

4. The expandable intervertebral bone graft according to claim 1, characterized in that: The driving device includes a support frame, a screw rod is rotatably installed on the support frame, and the screw rod is threadedly connected with a first slider and a second slider, and the support frame is provided with a slide groove arranged along the length direction of the screw rod, and the first slider and the second slider are both slidably arranged in the slide groove. When the screw rod rotates, the first slider and the second slider can slide closer to or away from each other along the slide groove, and the first slider is hinged with a first connecting rod, and the second slider is hinged with a second connecting rod. The proximal end of the first clamp arm is provided with a first long through hole arranged along the length direction of the first clamp arm, and the proximal end of the second clamp arm is provided with a second long through hole arranged along the length direction of the second clamp arm, and the end of the first connecting rod away from the first slider is slidably hinged on the first long through hole, and the end of the second connecting rod away from the second slider is slidably hinged on the second long through hole.

5. The expandable intervertebral bone graft according to claim 4, characterized in that: The support frame is a square barrel-shaped structure, with the barrel mouth of the support frame arranged toward the proximal ends of the first clamp arm and the second clamp arm, and the four barrel side walls of the support frame are respectively two oppositely arranged first barrel side walls and two oppositely arranged second barrel side walls, the screw is rotatably installed between the two first barrel side walls, and the slide groove is provided on the two second barrel side walls, one end of the screw passes through the first barrel side wall and extends to the outside of the support frame, and a rotating handle is fixedly provided on one end of the screw located on the outside of the support frame.

6. The expandable intervertebral bone graft according to claim 1, characterized in that: The driving device includes a support frame, a nut is rotatably installed on the support frame, a screw rod is threadedly connected in the screw hole of the nut, the screw rod is hinged to one end of the first connecting rod and the second connecting rod through a first pin shaft, the first connecting rod and the second connecting rod are respectively located on opposite sides of the screw rod, the first connecting rod and the second connecting rod are respectively located between the proximal ends of the first clamp arm and the second clamp arm, the other end of the first connecting rod is hinged to the proximal end of the first clamp arm through the second pin shaft, and the other end of the second connecting rod is hinged to the proximal end of the second clamp arm through a third pin shaft.

7. The expandable intervertebral bone graft according to claim 6, characterized in that: The support frame includes a first support plate, a second support plate and a third support plate, the second support plate and the third support plate are fixed on the same side of the first support plate with relative spacing, the nut is rotatably mounted on the first support plate, one end of the screw is threadedly connected to the screw hole of the nut, the other end of the screw is located between the second support plate and the third support plate, the other end of the screw is hinged to one end of the first connecting rod and the second connecting rod through a first pin shaft, the first connecting rod and the second connecting rod are both located between the second support plate and the third support plate, and the first clamp arm and the second clamp arm are also both located between the second support plate and the third support plate.

8. The expandable intervertebral bone graft according to claim 1, characterized in that: The driving device includes a support frame, a screw rod is threadedly connected to the support frame, the screw rod is rotatably connected to a push-pull rod, the push-pull rod and the screw rod are coaxially arranged, the push-pull rod is hinged to one end of the first connecting rod and the second connecting rod through a first pin shaft, the first connecting rod and the second connecting rod are respectively located on opposite sides of the push-pull rod, the first connecting rod and the second connecting rod are both located between the proximal ends of the first clamp arm and the second clamp arm, the other end of the first connecting rod is hinged to the proximal end of the first clamp arm through a second pin shaft, and the other end of the second connecting rod is hinged to the proximal end of the second clamp arm through a third pin shaft.

9. The expandable intervertebral bone graft according to claim 8, characterized in that: The support frame includes a first support plate, a second support plate and a third support plate, the second support plate and the third support plate are fixed on the same side of the first support plate with relative spacing, one end of the screw is threadedly connected to the first support plate, the other end of the screw is located between the second support plate and the third support plate, the other end of the screw is rotatably connected to one end of the push-pull rod, the other end of the push-pull rod is hinged to one end of the first connecting rod and the second connecting rod through a first pin shaft, and the push-pull rod, the first connecting rod, the second connecting rod, the first clamp arm and the second clamp arm are all located between the second support plate and the third support plate.

10. The expandable intervertebral bone graft according to claim 9, characterized in that: The other end of the screw rod is provided with a cylindrical slot, the slot is coaxially arranged with the screw rod, one end of the push-pull rod is provided with a cylindrical block, the block is coaxially arranged with the push-pull rod, and the block is engaged in the slot, or A cylindrical clamping block is disposed at the other end of the screw rod, and the clamping block is coaxially arranged with the screw rod. A cylindrical clamping groove is disposed at one end of the push-pull rod, and the clamping block is engaged in the clamping groove.

Images