Special bone harvesting and bone grafting device for iliac bone blocks with cortical bone

Abstract

The present invention discloses a special bone harvesting and bone grafting device for iliac bone blocks with cortical bone, which includes a connecting plate. At least one osteotome is provided on one side of the connecting plate, and a connecting rod is provided on the other side. A percussion component is provided on one side of the connecting rod, and a depth-limiting component is sleeved on the connecting rod. By setting two mutually parallel bone harvesting knives, during bone harvesting, they are adjusted to the size estimated by imaging and the bone chiseling depth is precisely limited. After the two bone knives can chisel the two sides of the iliac bone block parallel and vertically at one time, the third side of the iliac bone block can be intercepted through the swing knife guiding groove channel between the two limiting plates by an ordinary swing knife. In this way, an iliac bone block with an upper and lower surface and one side surface having cortical bone is intercepted, and during the bone harvesting process, the stress area and stress accuracy of the iliac bone are increased, avoiding the splashing of small iliac bone blocks. After the bone harvesting is completed, the present invention can directly be used to complete the bone grafting operation, so that the present invention can complete the bone harvesting and bone grafting operations at one time.

Description

Technical Field

[0001] The present invention relates to the field of orthopedic medicine, and particularly to a special device for harvesting and implanting iliac bone blocks with cortical bone Background Art

[0002] When performing autologous bone grafting in clinical orthopedics, the ilium is the most common donor site. This is because the ilium can provide a relatively large amount of autologous bone, and the impact on the stability of the entire pelvis after ilium bone harvesting is relatively small. Therefore, the ilium is also known as the body's bone bank. Intervertebral spinal fusion surgery (cervical, thoracic, lumbar) is currently the most commonly used spinal fusion technique, and there is sufficient evidence-based medicine evidence for its clinical effectiveness. The gold standard for intervertebral structural bone grafting is the implantation of iliac bone blocks with cortical bone. In the prior art, the commonly used bone harvesting steps generally involve preoperatively estimating the size of the bone graft required using imaging, then using an osteotome to cut an iliac bone block larger than the estimated size, and finally trimming it into the appropriate size and shape before implanting the iliac bone into the vertebral space. However, there are several problems in the prior art during this process: 1) It is impossible to accurately remove the bone block size estimated by imaging. Usually, a larger bone block is taken and then trimmed; 2) In the prior art, the osteotome generally needs to be struck repeatedly, so it is easy to cause small pieces of iliac bone to splash, affecting the accuracy of bone harvesting; 3) There is a lack of special bone implanting tools for iliac bone blocks, and during the bone implanting process, cancellous bone compression and cortical bone damage may occur, thus affecting the structural integrity of the iliac bone block and the function of structural bone grafting..

[0003] To solve the above problems, a special device for harvesting and implanting iliac bone blocks with cortical bone is proposed in the present invention Summary of the Invention

[0004] The purpose of the present invention is to overcome the problems in the prior art that the iliac bone block is not accurately taken during the ilium bone harvesting process, and it is easy to cause small pieces of iliac bone to splash and the disinfection is not perfect. The present invention sets two mutually parallel bone harvesting knives, which can be accurately adjusted to the size estimated by imaging during bone harvesting, and increases the force-bearing area and force-bearing accuracy of the ilium during the bone harvesting process to avoid small pieces of iliac bone blocks from splashing. After the bone harvesting is completed, the present invention can be directly used to complete the bone implanting surgery, enabling the present invention to complete the bone harvesting and bone implanting surgeries in one go, avoiding problems such as cancellous bone compression and cortical bone damage caused by removing and modifying the ilium during traditional surgeries

[0005] To solve the above technical problems, the present invention provides a special bone harvesting and bone grafting device for cortical bone iliac bone blocks, including a connecting plate. At least one osteotome is provided on one side of the connecting plate, and a connecting rod is provided on the other side. A knocking component is provided on one side of the connecting rod, and a depth limiting component is sleeved on the connecting rod. A shock absorption component is provided between the two osteotomes. The depth limiting component includes a sleeve rotatably sleeved on the connecting rod. A support plate is sleeved on the sleeve, and the sleeve is threadedly connected to the support plate. An extension plate is provided on the sleeve, and a fastening knob is provided on the extension plate. At least one sliding plate is fixedly provided on the support plate. The sliding plate penetrates through the connecting plate, and a depth limiting plate is fixedly provided on the sliding plate. Distance scales are provided on the sliding plate.

[0006] Preferably, a set of adjusting components are provided on the connecting plate. The adjusting components include sliders fixedly provided on the osteotomes. Threaded holes are provided in the sliders. The sliders are slidably connected to a chute opened on one end face of the connecting plate. A swing knife guiding groove is opened in one of the chutes. Width digital scales are provided on the connecting plate at the swing knife guiding groove. A limiting plate is provided on one of the sliders, and the limiting plate is located in the swing knife guiding groove.

[0007] Preferably, a screw rod is rotatably provided in the chute. Two sets of screw threads with opposite helix directions are symmetrically provided on the screw rod. The two sides of the screw rod are respectively threadedly connected to the threaded holes. A rotating knob is provided on one side of the screw rod, and a baffle is provided on the other side. A positioning knob is provided on the baffle.

[0008] Preferably, the knocking component includes an impact rod. The impact rod is slidably provided in an impact cavity opened on one side of the connecting rod. An impact head is fixedly provided on the impact rod. The impact head is connected to one end face of the connecting rod through a return spring. A force receiving plate is provided on the impact head.

[0009] Preferably, a rolling groove is opened on the impact head. A hemisphere is rollably provided in the rolling groove. The hemisphere is connected to the force receiving plate. An annular rod is fixedly provided on the connecting rod. An annular plate is provided on the annular rod. The annular rod is swingably connected to the annular plate. The annular plate is connected to the force receiving plate through a plurality of buffer springs arranged in a circle.

[0010] Preferably, the shock absorption component includes an intermediate plate. The intermediate plate is slidably connected to the connecting rod through a hollow column. An accommodation cavity is provided in the intermediate plate. Two sets of sliding components are provided on both sides of the intermediate plate. The sliding components include side plates slidably provided in the intermediate plate. The two side plates are connected through at least one connecting spring. A rubber pad is provided on one side of the side plate. The rubber pad is in low contact with the osteotome. An exhaust hole is provided on the rubber pad. A plurality of through holes are provided on the side plate. The exhaust hole is communicated with the accommodation cavity through the accommodation cavity.

[0011] Preferably, a hollow cavity is provided inside the hollow column, a fixed column is slidably provided inside the hollow cavity, the fixed column is connected to the inner wall of the hollow cavity through a telescopic spring, the fixed column is fixedly connected to a placement groove opened on one side of the connecting rod, and the hollow cavity communicates with the placement cavity.

[0012] Preferably, two groups of balance components are symmetrically provided between the shock absorption component and the connecting plate. The balance component includes a balance column fixedly connected to the middle plate. A balance cavity is provided inside the balance column, a balance shaft is slidably provided inside the balance cavity, one side of the balance shaft is fixedly connected to the connecting plate, and the other side is connected to the inner wall of the balance cavity through a balance spring.

[0013] Compared with the prior art, by providing two bone gouges parallel to each other, during bone harvesting, it is adjusted to the size estimated by imaging and the bone chiseling depth is precisely limited. After the two bone gouges can chisel out two sides of the iliac bone block in parallel and vertically at one time, the third side of the iliac bone block can be intercepted through the swing knife guide groove channel between the two limit plates by an ordinary swing knife. In this way, an iliac bone block with a cortical bone on the upper and lower surfaces and one side surface is intercepted, and during the bone harvesting process, the stress area and stress accuracy of the iliac bone are increased, small pieces of iliac bone blocks are prevented from splashing, and after the bone harvesting is completed, the bone grafting operation can be directly completed using the present invention, so that the present invention can complete the bone harvesting and bone grafting operations at one time. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a three-dimensional structural schematic diagram of a special bone harvesting and bone grafting device for iliac bone blocks with cortical bone of the present invention;

[0015] Figure 2 is an exploded structural schematic diagram of a special bone harvesting and bone grafting device for iliac bone blocks with cortical bone of the present invention;

[0016] Figure 3 is an isometric sectional structural schematic diagram of a part of a special bone harvesting and bone grafting device for iliac bone blocks with cortical bone of the present invention;

[0017] Figure 4 is another isometric sectional structural schematic diagram of a special bone harvesting and bone grafting device for iliac bone blocks with cortical bone of the present invention;

[0018] Figure 5 is an isometric sectional schematic diagram of a shock absorption component of a special bone harvesting and bone grafting device for iliac bone blocks with cortical bone of the present invention.

[0019] The reference numerals are as follows:

[0020] Connecting plate 1, bone knife 10, chute 101, slider 102, threaded hole 103, limiting plate 105, rotating knob 11, screw rod 110, baffle 12, positioning knob 13, swing knife guide groove 14, width digital display scale 140, connecting rod 2, impact chamber 20, placement groove 21, fixing column 22, hollow column 23, hollow cavity 230, telescopic spring 231, balance column 25, balance cavity 250, balance spring 251, balance shaft 26, depth limiting component 3, sleeve 30, extension plate 31, fastening knob 32, sliding plate 33, distance scale 330, support plate 34, depth limiting plate 35, knocking component 4, impact rod 40, annular rod 41, annular plate 42, buffer spring 43, reset spring 45, impact head 46, rolling groove 460, hemisphere 47, force receiving plate 48, shock absorption component 5, middle plate 50, placement cavity 501, side plate 51, through hole 510, rubber pad 52, exhaust hole 520, connecting spring 53. Detailed implementation manner

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0022] The following combines the attached Figures 1-5 and embodiments to further illustrate the present invention:

[0023] In this embodiment, referring to the connecting plate 1 - percussion component 4 shown in the figure, a special bone harvesting and bone grafting device for cortical iliac bone blocks includes a connecting plate 1. At least one osteotome 10 is provided on one side of the connecting plate 1. Preferably, the number of osteotomes 10 is two, and the two osteotomes 10 are parallel to each other to form a U - shaped osteotome structure, and the distance between the two osteotomes 10 is adjustable. On the other side of the connecting plate 1, there is a connecting rod 2. A percussion component 4 is provided on one side of the connecting rod 2. A depth - limiting component 3 is sleeved on the connecting rod 2. A shock - absorbing component 5 is provided between the two osteotomes 10. The depth - limiting component 3 includes a sleeve 30 rotatably sleeved on the connecting rod 2. A support plate 34 is sleeved on the sleeve 30. The sleeve 30 is threadedly connected to the support plate 34. An extension plate 31 is provided on the sleeve 30. A fastening knob 32 is provided on the extension plate 31. The fastening knob 32 includes a limiting shaft in contact with the connecting rod 2. At least one sliding plate 33 is fixedly provided on the support plate 34. The sliding plate 33 penetrates through the connecting plate 1, and a depth - limiting plate 35 is fixedly provided on the sliding plate 33. A distance scale 330 is provided on the sliding plate 33. When the present invention is in use, by rotating the sleeve 30, the sleeve 30 rotates around the connecting rod 2. After the sleeve 30 rotates, it drives the support plate 34 to move up and down. The distance of the up - and - down movement of the support plate 34 can be intuitively displayed through the distance scale 330. When the support plate 34 moves up and down, it drives the depth - limiting plate 35 to move up and down through the sliding plate 33 to the required thickness of the iliac bone. Then, by rotating the fastening knob 32, when the limiting shaft in the fastening knob 32 is in contact with the surface of the connecting rod 2, the extension plate 31 is fixed to the connecting rod 2. At this time, the position of the depth - limiting plate 35 is fixed, thereby limiting the bone - harvesting depth of the osteotome 10. Then, the distance between the two osteotomes 10 is adjusted so that the distance between the two osteotomes 10 is equal to the iliac bone size required by imaging. After the two osteotomes 10 are abutted against the iliac bone to be harvested, the shock - absorbing component 5 is in contact with one side surface of the iliac bone to prevent small pieces of iliac bone from splashing during the bone - chiseling process. At this time, by using a bone hammer to strike the percussion component 4, two parallel and perpendicular surfaces of the iliac bone block can be cut out in one chiseling operation.

[0024] First of all, it should be noted that in the prior art, the harvesting of iliac bone blocks during iliac bone harvesting is inaccurate and prone to causing small pieces of iliac bone to splash.

[0025] In the present invention, by providing two parallel osteotomes, during bone harvesting, it is adjusted to the size estimated by imaging and the chiseling depth is accurately limited, and the stress area and stress accuracy of the iliac bone are increased during bone harvesting to prevent small pieces of iliac bone from splashing.

[0026] In this embodiment, referring to as Figures 1-3As shown, a set of adjusting components are provided on the connecting plate 1. The adjusting components include a slider 102 fixedly arranged on the bone knife 10. A threaded hole 103 is provided in the slider 102. The slider 102 is slidably connected to a chute 101 opened on one end face of the connecting plate 1. A swing knife guiding groove 14 is opened in one chute 101. A width digital scale 140 is provided on the connecting plate 1 at the swing knife guiding groove 14. A limiting plate 105 is provided on one slider 102, and the limiting plate 105 is located in the swing knife guiding groove 14.

[0027] In this embodiment, as shown in Figures 1-3 As shown, a screw rod 110 is rotatably arranged in the chute 101. Two sets of screw threads with opposite helix directions are symmetrically arranged on the screw rod 110. The two sides of the screw rod 110 are respectively threadedly connected to the threaded holes 103. A rotating knob 11 is provided on one side of the screw rod 110, and a baffle 12 is provided on the other side. A positioning knob 13 is provided on the baffle 12. The positioning knob 13 includes a limiting pin that is in low contact with the connecting plate 1. After the positioning knob 13 rotates, the limiting pin can be in close low contact with the side surface of the connecting plate 1, so as to realize the limitation of the baffle 12, and further realize the limitation of the two bone knives 10. When adjusting the distance between the two bone knives 10 so that the two bone knives 10 can cut the two sides of the iliac bone block parallel and perpendicular to each other in one bone chiseling, the rotating knob 11 can be manually rotated. After the rotating knob 11 rotates, it drives the screw rod 110 to rotate. Since the two sides of the screw rod 110 are respectively helically connected to the sliders 102, and since two sets of opposite screw threads are symmetrically arranged on the screw rod 110, during the rotation of the screw rod 110, the screw rod 110 drives the two sliders 102 thereon to move away from or close to each other. Each slider 102 drives the limiting plates 105 thereon to move away from or close to each other. At the same time, the slider 102 drives the bone knife 10 thereon to move away from or close to each other. In this way, the distance between the two bone knives 10 is the distance between the two limiting plates 105, and the distance between the two limiting plates 105 is the width of the iliac bone taken. At the same time, after the two bone knives 10 can cut the two sides of the iliac bone block parallel and perpendicular to each other in one bone chiseling, a common swing knife can be used to cut out the third side of the iliac bone block from the channel of the swing knife guiding groove 14 between the two limiting plates 105. In this way, an iliac bone block with upper and lower surfaces and one side surface having cortical bone can be cut out.

[0028] In this embodiment, as shown in Figure 3As shown, the percussion component 4 includes an impact rod 40. The impact rod 40 is slidably arranged in an impact cavity 20 opened on one side of the connecting rod 2. An impact head 46 is fixedly arranged on the impact rod 40. The impact head 46 is connected to one end face of the connecting rod 2 through a return spring 45. A force-bearing plate 48 is arranged on the impact head 46. After the two bone knives 10 are adjusted to precise positions and the depth-limiting plate 35 is adjusted to a precise limiting depth, when the bone knives 10 and the shock-absorbing component 5 are attached to the ilium, at this time, the doctor can strike the force-bearing plate 48. After the force-bearing plate 48 is transmitted to the impact rod 40 through the impact head 46, the impact rod 40 slides downward to strike the connecting rod 2 and then quickly returns to its original position under the action of the return spring 45. In this way, the percussion force is transmitted to the connecting plate 1 through the connecting rod 2 and then transmitted to the two bone knives 10, and the two bone knives 10 chisel the ilium to take bone from the ilium.

[0029] Further, as shown in Figures 2-3 As shown, a rolling groove 460 is opened on the impact head 46. A hemisphere 47 is rotatably arranged in the rolling groove 460. The hemisphere 47 is connected to the force-bearing plate 48. An annular rod 41 is fixedly arranged on the connecting rod 2. An annular plate 42 is arranged on the annular rod 41. The annular rod 41 is swingably connected to the annular plate 42, and the annular plate 42 is connected to the force-bearing plate 48 through a plurality of buffer springs 43 arranged circumferentially. When the doctor strikes the force-bearing plate 48, since it is impossible to ensure that the percussion force is completely concentric with the connecting rod 2, it is impossible to ensure that when the two bone knives 10 chisel the ilium, the chiseling force is completely perpendicular to the ilium. In order to avoid the non-perpendicular percussion force causing the ilium to splash when the bone knife 10 chisels the ilium, by arranging the hemisphere 47, when the force-bearing plate 48 receives an inclined percussion force, the force-bearing plate 48 tilts to a certain extent, and the inclined force of the force-bearing plate 48 is transmitted to the annular plate 42 through a plurality of buffer springs 43, causing the annular plate 42 to swing. In this way, it is avoided that the inclined percussion force when the doctor strikes is transmitted to the bone knife 10 through the connecting rod 2, resulting in an inclined percussion force between the bone knife 10 and the ilium, causing damage to the ilium or splashing of ilium pieces.

[0030] In this embodiment, as shown in Figures 3-5As shown, the shock absorption assembly 5 includes an intermediate plate 50. The intermediate plate 50 is slidably connected to the connecting rod 2 through a hollow column 23. An accommodation cavity 501 is provided inside the intermediate plate 50. Two sets of sliding assemblies are provided on both sides of the intermediate plate 50. The sliding assembly includes side plates 51 slidably arranged inside the intermediate plate 50. Preferably, the surfaces of the side plates 51 on the intermediate plate 50 are covered with soft rubber made of elastic material to avoid damaging the cortical layer of the ilium. The two side plates 51 are connected by at least one connecting spring 53. A rubber pad 52 is provided on one side of the side plate 51. The rubber pad 52 is in low contact with the bone knife 10. An exhaust hole 520 is provided on the rubber pad 52. A plurality of through holes 510 are provided on the side plate 51. The exhaust hole 520 is communicated with the accommodation cavity 501 through the accommodation cavity 501. When adjusting the distance between the two bone knives 10, when the two bone knives 10 approach each other, the two bone knives 10 drive the two side plates 51 to approach each other respectively. During the process of the two side plates 51 approaching each other, the space inside the accommodation cavity 501 is compressed, so that the gas inside the accommodation cavity 501 enters the exhaust hole 520 through the through holes 510, and then the exhaust hole 520 blows one side surface of the bone knife 10 in time to clean the possible residual dust on the bone knife 10, avoiding falling onto the ilium during the operation and causing infection. The plane formed by the intermediate plate 50 and the side plates 51 can increase the contact area with the ilium and completely cover the required ilium, avoiding the splashing of ilium blocks and increasing the stability during the bone chiseling process.

[0031] Further, referring to as Figures 3-4 As shown, a hollow cavity 230 is provided inside the hollow column 23. A fixing column 22 is slidably arranged inside the hollow cavity 230. The fixing column 22 is fixedly connected to the inner wall of the hollow cavity 230 through a telescopic spring 231. The fixing column 22 is fixedly connected to an accommodation groove 21 provided on one side of the connecting rod 2. The hollow cavity 230 is communicated with the accommodation cavity 501. And when the two bone knives 10 chisel the ilium by knocking the force receiving plate 48, when the two bone knives 10 move downward, the hollow column 23 slides in the direction of the fixing column 22, and the hollow column 23 drives the intermediate plate 50 and the side plates 51 to move upward, which has no influence on the downward chiseling of the ilium by the bone knives 10.

[0032] Further, referring to as Figure 4 As shown, two sets of balance assemblies are symmetrically provided between the shock absorption assembly 5 and the connecting plate 1. The balance assembly includes a balance column 25 fixedly connected to the intermediate plate 50. A balance cavity 250 is provided inside the balance column 25. A balance shaft 26 is slidably arranged inside the balance cavity 250. One side of the balance shaft 26 is fixedly connected to the connecting plate 1, and the other side is connected to the inner wall of the balance cavity 250 through a balance spring 251. By providing the balance assembly, during the process of the bone knife 10 chiseling the ilium, the intermediate plate 50 and the side plates 51 have better balance when moving upward on the ilium surface, avoiding the influence of the intermediate plate 50 and the side plates 51 on the chiseling of the ilium.

[0033] In an optional embodiment, after the two bone cutters 10 have taken out the required iliac bone block from the patient's ilium and need to transplant it into the intervertebral space, the two bone cutters 10 can clamp the iliac bone and then loosen the locking knob 32, and then rotate the sleeve 30 again, so that the sleeve 30 drives the support plate 34 to move downward, and the support plate 34 moves downward and drives the depth limit plate 35 to move downward through the two sliding plates 33. The two depth limit plates 35 move the iliac bone block clamped on the bone cutter 10 away from the side plates 51 through the middle plate 50 and the side plates 51, so that the iliac bone block is moved away from the side plates 51. After the thickness on one side exceeds the bone knife 10, the iliac bone block can be placed at the entrance of the intervertebral bone grafting bed, and the part of the iliac bone block that exceeds the bone knife 10 can be entered into the intervertebral space by knocking the force plate 48. Then, after the bone knife 10 and the iliac bone block are completely loosened, the middle plate 50 is fitted with the iliac bone block, and then the knocking plate 48 is knocked again to adjust the iliac bone block to a suitable position, so that the present invention can complete the bone removal and bone grafting surgery at one time, avoiding the problem of removing and trimming the iliac bone block and then transplanting it into the intervertebral space in traditional surgery, which leads to cancellous bone compression, cortical bone damage and other problems.

[0034] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. Special bone harvesting and bone grafting device for iliac bone block with cortical bone, comprising a connecting plate (1), at least one osteotome (10) is provided on one side of the connecting plate (1), and a connecting rod (2) is provided on the other side, characterized in that: One side of the connecting rod (2) is provided with a knocking component (4), a depth-limiting component (3) is sleeved on the connecting rod (2), a damping component (5) is arranged between the two bone knives (10), the depth-limiting component (3) includes a sleeve (30) rotatably sleeved on the connecting rod (2), a support plate (34) is sleeved on the sleeve (30), the sleeve (30) is in threaded connection with the support plate (34), an extension plate (31) is arranged on the sleeve (30), a fastening knob (32) is arranged on the extension plate (31), at least one sliding plate (33) is fixedly arranged on the support plate (34), the sliding plate (33) penetrates through the connecting plate (1), and a depth-limiting plate (35) is fixedly arranged on the sliding plate (33), and a distance scale (330) is arranged on the sliding plate (33); A set of adjusting components are arranged on the connecting plate (1), the adjusting components include a slider (102) fixedly arranged on the bone knife (10), a threaded hole (103) is arranged in the slider (102), the slider (102) is slidably connected with a chute (101) opened on one end face of the connecting plate (1), and a swing knife guiding groove (14) is opened in one of the chutes (101), a width digital display scale (140) is arranged on the connecting plate (1) at the position of the swing knife guiding groove (14), a limiting plate (105) is arranged on one of the sliders (102), and the limiting plate (105) is located in the swing knife guiding groove (14); The knocking component (4) includes an impact rod (40), the impact rod (40) is slidably arranged in an impact cavity (20) opened on one side of the connecting rod (2), an impact head (46) is fixedly arranged on the impact rod (40), the impact head (46) is connected with one end face of the connecting rod (2) through a return spring (45), and a stress plate (48) is arranged on the impact head (46); A rolling groove (460) is opened on the impact head (46), a hemisphere (47) is rotatably arranged in the rolling groove (460), the hemisphere (47) is connected with the stress plate (48), a ring rod (41) is fixedly arranged on the connecting rod (2), a ring plate (42) is arranged on the ring rod (41), the ring rod (41) is swingably connected with the ring plate (42), and the ring plate (42) is connected with the stress plate (48) through a plurality of buffer springs (43) arranged in a circumferential manner.

2. The special bone harvesting and bone grafting device for cortical bone iliac bone blocks as described in claim 1, characterized in that: A screw rod (110) is rotatably arranged in the chute (101), two groups of screw threads with opposite helix directions are symmetrically arranged on the screw rod (110), two sides of the screw rod (110) are respectively in threaded connection with the threaded holes (103), a rotating knob (11) is arranged on one side of the screw rod (110), a baffle (12) is arranged on the other side, and a positioning knob (13) is arranged on the baffle (12).

3. The special bone harvesting and bone grafting device for iliac bone blocks with cortical bone as claimed in claim 1, wherein: The shock-absorbing assembly (5) includes an intermediate plate (50). The intermediate plate (50) is slidably connected to the connecting rod (2) through a hollow column (23). An accommodation cavity (501) is provided in the intermediate plate (50). Two sets of sliding assemblies are provided on both sides of the intermediate plate (50). The sliding assembly includes side plates (51) slidably arranged in the intermediate plate (50). The two side plates (51) are connected by at least one connecting spring (53). A rubber pad (52) is provided on one side of the side plate (51). The rubber pad (52) is in low contact with the bone knife (10). An exhaust hole (520) is provided on the rubber pad (52). A plurality of through holes (510) are provided on the side plate (51). The exhaust hole (520) communicates with the accommodation cavity (501) through the accommodation cavity (501).

4. The special bone harvesting and bone grafting device for cortical bone iliac bone block according to claim 3, wherein: A hollow cavity (230) is provided in the hollow column (23). A fixed column (22) is slidably arranged in the hollow cavity (230). The fixed column (22) is connected to the inner wall of the hollow cavity (230) through a telescopic spring (231). The fixed column (22) is fixedly connected to an accommodation groove (21) provided on one side of the connecting rod (2). The hollow cavity (230) communicates with the accommodation cavity (501).

5. The special bone harvesting and bone grafting device for cortical iliac bone blocks according to claim 3, characterized in that Two sets of balance assemblies are symmetrically provided between the shock-absorbing assembly (5) and the connecting plate (1). The balance assembly includes a balance column (25) fixedly connected to the intermediate plate (50). A balance cavity (250) is provided in the balance column (25). A balance shaft (26) is slidably arranged in the balance cavity (250). One side of the balance shaft (26) is fixedly connected to the connecting plate (1), and the other side is connected to the inner wall of the balance cavity (250) through a balance spring (251).

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