A cutting device and a cutting method for cancellous bone strip preparation

Abstract

The application discloses a cutting device and a cutting method for preparing cancellous bone strips. The cutting device comprises a rough cutting module for cutting cancellous bone raw materials into initial cutting bone strips, a rough cutting bearing part, a grid knife assembly, a linear driving assembly and a linear guide mechanism; the rough cutting bearing part and the grid knife assembly are arranged oppositely in the vertical direction, and the linear driving assembly can drive the grid knife assembly to move reciprocally along the vertical direction on the linear guide mechanism; and a fine cutting module for cutting the initial cutting bone strips into cutting bone strips; the fine cutting module is mainly formed by the hinging of a first rod and a second rod, parallel knife blade assemblies and bone strip limiting structures are arranged on the opposite surfaces of the first rod and the second rod respectively, and the bone strip limiting structures form limiting grooves for placing the initial cutting bone strips. The device adopts the combined mode of rough cutting and fine cutting, is favorable for improving the cutting efficiency and size consistency in the preparation process of the cancellous bone strips, and is suitable for the pretreatment cutting link in the preparation of allogeneic bone strips.

Description

Technical Field

[0001] This invention relates to the field of allogeneic bone material processing technology, and in particular to a mechanical cutting device and method for preparing cancellous bone strips, which is suitable for cutting and preparing bone strip-shaped materials using cancellous bone tissue such as femoral head as raw materials. Background Technology

[0002] Allogeneic bone is a commonly used type of bone graft material in orthopedic implantation and bone defect repair. When preparing bone strips from cancellous bone tissue such as the femoral head, it is usually necessary to first cut the irregular bone tissue into strips of a certain size, followed by subsequent processing such as cleaning, degreasing, decellularization, sterilization, freeze-drying, or packaging. The quality of bone strip cutting affects the convenience of subsequent processing and the consistency of the product's dimensions.

[0003] The femoral head has an irregular shape and is primarily composed of cancellous bone, with variations in trabecular distribution and local strength. During cutting, using ordinary knives, saw blades, or manual piece-by-piece cutting can easily lead to problems such as unstable cutting direction, significant differences in bone strip cross-sectional dimensions, localized bone fragmentation, or low cutting efficiency. Especially when obtaining smaller cross-sectional strips, directly cutting larger bone blocks results in greater cutting resistance and uneven stress on the cut bone tissue, which can negatively impact the quality of the bone strip formation.

[0004] Among the existing cutting methods, some rely on the operator's experience for manual positioning and force application, resulting in poor repeatability of cutting dimensions; others use general cutting equipment for segmentation, which can complete the cutting of bone tissue, but the clamping, positioning and cleaning operations are relatively inconvenient, and may not be suitable for the continuous preparation of femoral head cancellous bone material from large pieces of bone tissue to small cross-section bone strips. Summary of the Invention

[0005] To address the problems of inconvenient positioning, uneven force distribution, insufficient dimensional consistency, and low operating efficiency in existing cutting processes using manual knives or general cutting tools, this invention provides a cutting device and method for preparing cancellous bone strips.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] I. A cutting device for preparing cancellous bone strips

[0008] The cutting device includes:

[0009] A coarse cutting module is used to cut cancellous bone material into initial cut bone strips; it includes a coarse cutting support part, a mesh blade assembly, a linear drive assembly, and a linear guide mechanism; the coarse cutting support part and the mesh blade assembly are arranged opposite each other in the vertical direction, and the linear drive assembly can drive the mesh blade assembly to reciprocate in the vertical direction on the linear guide mechanism; the coarse cutting support part is used to place the cancellous bone material, and the cutting surface of the mesh blade assembly is arranged downwards;

[0010] A fine cutting module is used to cut the initial cut bone strip into cut bone strips; it includes a first rod and a second rod, the first rod and the second rod are hinged together; and can rotate relative to each other about the hinge point. Parallel blade assemblies and bone strip limiting structures are respectively arranged on the opposite surfaces of the first rod and the second rod. The bone strip limiting structure forms a limiting groove, and the limiting groove is used to place the initial cut bone strip.

[0011] The linear drive assembly includes a first lever, a second lever, an intermediate connecting rod, a push rod, a sliding blade holder, and a support base. The support base has a U-shaped structure, which includes a bottom wall and a first side arm and a second side arm extending upward from the bottom wall. The height of the first side arm is lower than that of the second side arm. The free end of the first side arm is hinged to the middle of the first lever, and the free end of the second side arm is hinged to the middle of the second lever. The adjacent ends of the first lever and the second lever are respectively hinged to the two ends of the intermediate connecting rod.

[0012] The end of the first lever away from the second lever is used as the driving end of the linear drive assembly. The end of the second lever away from the first lever is hinged to one end of the push rod. The other end of the push rod is hinged to the sliding blade holder. The sliding blade holder is slidably engaged with the linear guide mechanism. A grid blade assembly is mounted on the sliding blade holder.

[0013] The mesh blade assembly includes a mesh blade; the mesh blade includes a plurality of first blades arranged at equal intervals along a first direction and a plurality of second blades arranged at equal intervals along a second direction, the first direction and the second direction being perpendicular to each other and both being parallel to the horizontal direction; the first blades and the second blades are arranged intersectingly to form a mesh-like cutting edge.

[0014] In the grid cutter, the spacing between adjacent first blades is equal to the spacing between adjacent second blades, so that the grid-shaped cutting blades form multiple cutting units arranged in a square. The cutting unit is used to form a preliminary cutting strip in the effective cutting area of ​​the cancellous bone material. The length of the preliminary cutting strip corresponds to the thickness of the cancellous bone material in the cutting direction, and the cross-sectional shape of the preliminary cutting strip along the length direction corresponds to the shape of the cutting unit.

[0015] The side length of the cross section is slightly smaller than the width of the limiting groove formed by the bone strip limiting structure; when the initial cut bone strip is placed into the limiting groove, the length direction of the initial cut bone strip is parallel to the length direction of the limiting groove and the parallel blade assembly.

[0016] The mesh cutter assembly also includes a cutter extension frame, which is arranged between the mesh cutter and the sliding cutter holder, and the mesh cutter and the sliding cutter holder are connected through the cutter extension frame.

[0017] The coarse cutting support includes a support platform and at least four limiting brackets. Each limiting bracket is evenly arranged on the support platform at intervals along the same circumference. Each limiting bracket is provided with a limiting screw, which is arranged radially along the circumference and threadedly connected to the limiting bracket.

[0018] The middle part of the support platform is used to place the cancellous bone material. When the limiting screws on each limiting bracket are tightened, the limiting screws abut against the cancellous bone material, thereby fixing the cancellous bone material.

[0019] The limiting bracket is staggered with the blades of the grid blade assembly, and each limiting bracket is located between two adjacent blades of the grid blade assembly.

[0020] II. A method for preparing cancellous bone strips

[0021] The method for preparing cancellous bone strips uses the aforementioned cutting device for preparing cancellous bone strips, and includes the following steps: placing cancellous bone raw material on the coarse cutting support part of the coarse cutting module; driving the grid blade assembly to move downward along the linear guide mechanism through the linear drive assembly, so that the grid blade assembly cuts the cancellous bone raw material to obtain the initial cut bone strip;

[0022] The initial cut bone strip is placed in the bone strip limiting structure of the fine cutting module; the first and second rods are rotated relative to each other, and the initial cut bone strip is finely cut for the first time using the parallel blade assembly to obtain a bone piece; the bone piece is rotated 90° around its own length direction and then placed back in the bone strip limiting structure; the bone piece is finely cut for the second time using the parallel blade assembly to obtain the cut bone strip.

[0023] Preferably, the side length of the initial cut bone strip is 8 mm to 12 mm; the side length of the cut bone strip is 2 mm to 4 mm.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The cutting device of the present invention, through a coarse cutting module and a fine cutting module, enables cancellous bone materials such as femoral heads to be cut into coarse bone strips first, and then further cut into bone strips with smaller cross-sectional dimensions, which helps to reduce the difficulty of directly cutting large pieces of cancellous bone materials into small sizes.

[0026] 2. The cutting device of the present invention, by setting a grid blade assembly in the coarse cutting module, can perform multiple divisions on the cancellous bone raw material in one cutting process, which is beneficial to improve the processing efficiency of the coarse cutting stage and make the cross-sectional dimensions of the obtained coarse bone strips relatively uniform.

[0027] 3. The cutting device of the present invention forms a linear drive assembly through a first lever, an intermediate connecting rod, a second lever and a push rod, which can drive the grid blade assembly to complete the cutting under manual force conditions, without the need for an additional power source, and the structure is relatively simple.

[0028] 4. The cutting device of the present invention guides the sliding blade holder and the grid blade assembly by setting a linear guide mechanism, which helps to improve the problem of unstable cutting direction when cutting manually.

[0029] 5. The cutting device of the present invention can position or assist in fixing the cancellous bone material by setting a support platform, a limiting bracket and a limiting screw in the coarse cutting support part, which helps to reduce position movement during the cutting process.

[0030] In summary, the device and method of the present invention can improve the stability of cutting guidance, the consistency of bone strip specifications, and the efficiency of cutting operation while being simple in structure and easy to operate manually. They are especially suitable for the production of allogeneic bone strips. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the coarse cutting module of the present invention;

[0032] Figure 2 This is a schematic diagram of the fine cutting module of the present invention;

[0033] Figure 3 This is a schematic diagram of the structure of the rough-cut bearing part of the present invention;

[0034] Figure 4 This is a schematic diagram of the structure of the mesh blade assembly of the present invention when it is in a high position;

[0035] Figure 5 This is a schematic diagram of the structure of the mesh blade assembly of the present invention after it moves downward;

[0036] Figure 6 This is a schematic diagram of the structure of the limiting bracket and the grid knife when they are used for cutting according to the present invention;

[0037] Figure 7This is a schematic diagram of the structure of the fine cutting module of the present invention when the initial cut bone strip is placed;

[0038] Figure 8 This is a schematic diagram of the structure of the fine cutting module of the present invention when it performs the first cut on the initially cut bone strip;

[0039] Figure 9 This is a schematic diagram of the structure of the fine cutting module of the present invention when performing a second cutting of the bone fragment.

[0040] In the diagram, 1. Base plate, 2. Rough cutting support, 3. Grid knife assembly, 4. Linear drive assembly, 5. Linear guide mechanism, 6. First rod, 7. Second rod, 8. Initial cutting bone strip, 9. Bone piece, 10. Cut bone strip, 21. Support platform, 22. Limiting bracket, 23. Limiting screw, 31. Grid knife, 32. Tool extension frame, 41. First lever, 42. Second lever, 43. Intermediate connecting rod, 44. Push rod, 45. Sliding tool holder, 46. Drive shaft, 47. Needle roller bearing, 48. Support seat, 61. Parallel blade assembly, 71. Bone strip limiting structure. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention.

[0042] This invention provides a cutting device and method for preparing cancellous bone strips. The cutting device includes a coarse cutting module and a fine cutting module. The coarse cutting module is used to cut the cancellous bone raw material into initial cut bone strips 8, and the fine cutting module is used to perform secondary cutting on the initial cut bone strips 8 to obtain the cut bone strips 10.

[0043] like Figure 1 As shown, the coarse cutting module includes a coarse cutting support 2, a mesh blade assembly 3, a linear drive assembly 4, and a linear guide mechanism 5; the coarse cutting support 2 and the mesh blade assembly 3 are arranged opposite each other in the vertical direction, and the linear drive assembly 4 can drive the mesh blade assembly 3 to reciprocate in the vertical direction on the linear guide mechanism 5; the coarse cutting support 2 is used to place cancellous bone material, and the cutting surface of the mesh blade assembly 3 is arranged downward and directly facing the cancellous bone material on the coarse cutting support 2.

[0044] like Figure 2As shown, the fine cutting module includes a first rod 6 and a second rod 7. One end of the first rod 6 and one end of the second rod 7 are hinged together by a hinge shaft. The first rod 6 and the second rod 7 can rotate relative to each other around the hinge. Parallel blade assembly 61 and bone strip limiting structure 71 are respectively arranged on the opposite surfaces of the first rod 6 and the second rod 7. The bone strip limiting structure 71 forms a limiting groove with an open top. The limiting groove is used to place the initial cutting bone strip 8 and to limit the lateral displacement of the initial cutting bone strip 8 in the length direction and / or the axial displacement in the length direction during the fine cutting process.

[0045] like Figure 1 As shown, the coarse cutting module also includes a base plate 1. The coarse cutting support part 2 and the linear drive assembly 4 are both fixedly mounted on the base plate 1.

[0046] like Figure 3 As shown, the coarse cutting support part 2 includes a support platform 21 and at least four limiting brackets 22. Each limiting bracket 22 is evenly arranged on the support platform 21 at intervals along the same circumference. Each limiting bracket 22 is provided with a limiting screw 23. The limiting screw 23 is arranged radially along the circumference and is threadedly connected to the limiting bracket 22. The end of the limiting screw 23 facing the center is used to abut against the cancellous bone material. The middle part of the support platform 21 is used to place the cancellous bone material. When the limiting screws 23 on each limiting bracket 22 are tightened, each limiting screw 23 abuts against the cancellous bone material from different directions, thereby fixing the cancellous bone material.

[0047] The limiting bracket 22 and the blades of the mesh knife assembly 3 are staggered. Each limiting bracket 22 is located between two adjacent blades of the mesh knife assembly 3, so that when the mesh knife assembly 3 cuts cancellous bone material, the blades pass through the limiting bracket 22 from both sides.

[0048] like Figure 6 As shown, the mesh blade assembly 3 includes a mesh blade 31. The mesh blade 31 includes a plurality of first blades arranged at equal intervals along a first direction and a plurality of second blades arranged at equal intervals along a second direction. The first direction and the second direction are perpendicular to each other and are both parallel to the horizontal direction. The first blades and the second blades are arranged intersectingly to form a mesh-like cutting edge. Preferably, the number of first blades is four and the number of second blades is four.

[0049] Specifically, in the grid cutter 31, the spacing between two adjacent first blades is equal to the spacing between two adjacent second blades, making each grid of the grid-like cutting edge a square. Each grid corresponds to a cut bone strip 8, the length of which is equal to the thickness of the cancellous bone material, and the cross-section in the length direction is square. The side length of the cross-section is slightly smaller than the width of the limiting groove formed by the bone strip limiting structure 71. When the initial cut bone strip 8 is placed in the limiting groove, the length direction of the initial cut bone strip 8 is parallel to the length direction of the limiting groove and the parallel blade assembly 61. Thus, after the first fine cut using the fine cutting module, the resulting bone piece 9 is rotated 90° around its length direction and placed again in the bone strip limiting structure 71, and then cut a second time using the parallel blade assembly 61, which can form a cut bone strip 10 with a cross-sectional side length smaller than the cross-sectional side length of the initial cut bone strip 8.

[0050] Furthermore, the mesh cutter assembly 3 also includes a cutter extension bracket 32, which is arranged between the mesh cutter 31 and the sliding cutter holder 45. The mesh cutter 31 and the sliding cutter holder 45 are connected by the cutter extension bracket 32.

[0051] like Figure 1 As shown, the linear drive assembly 4 includes a first lever 41, a second lever 42, an intermediate connecting rod 43, a push rod 44, a sliding blade holder 45, and a support base 48. The support base 48 is fixed to the base plate and adopts a U-shaped structure. The U-shaped structure includes a bottom wall and a first side arm and a second side arm extending upward from the bottom wall. The height of the first side arm is lower than that of the second side arm. The free end of the first side arm is hinged to the middle of the first lever 41, and the free end of the second side arm is hinged to the middle of the second lever 42. The adjacent ends of the first lever 41 and the second lever 42 are respectively hinged to the two ends of the intermediate connecting rod 43. The intermediate connecting rod 43 is used to transmit the swing of the first lever 41 to the second lever 42. The end of the first lever 41 away from the second lever 42 is used as the driving end of the linear drive assembly 4. The end of the second lever 42 away from the first lever 41 is hinged to one end of the push rod 44. The other end of the push rod 44 is hinged to the sliding knife holder 45. The sliding knife holder 45 is in sliding engagement with the linear guide mechanism 5. A grid knife assembly 3 is installed on the sliding knife holder 45.

[0052] Optionally, the first side arm and the first lever 41, the second side arm and the second lever 42, and the push rod 44 and the sliding knife holder 45 are all hinged through the transmission shaft 46 and the needle roller bearing 47.

[0053] In the above optional embodiments, a push rod support can be fixedly installed on the top surface of the sliding tool holder 45. The push rod support and the push rod 44 are hinged together by a needle roller bearing 47 and a drive shaft 46, thereby realizing the hinge between the push rod 44 and the sliding tool holder 45. The grid tool assembly 3 is arranged below the sliding tool holder 45.

[0054] Furthermore, a handle is provided at the end of the first lever 41 that is away from the second lever 42, for accepting manual force.

[0055] Preferably, the parallel blade assembly 61 includes two blades arranged parallel to each other, the two blades being fixed to the first rod 6 and located at the corresponding cutting position of the bone strip limiting structure 71.

[0056] The present invention also provides a method for preparing cancellous bone strips.

[0057] The method of the present invention uses the above-mentioned cutting device for preparing cancellous bone strips and includes the following steps:

[0058] Place the cancellous bone material to be cut on the coarse cutting support part 2 of the coarse cutting module;

[0059] The grid knife assembly 3 is driven by the linear drive assembly 4 to move downward along the linear guide mechanism 5, so that the grid knife assembly 3 cuts the cancellous bone material to obtain the initial cut bone strip 8.

[0060] like Figure 7 As shown, the initial cut bone strip 8 is placed in the bone strip limiting structure 71 of the fine cutting module;

[0061] like Figure 8 As shown, the first rod 6 and the second rod 7 are rotated relative to each other, so that the parallel blade assembly 61 performs the first fine cut on the initially cut bone strip 8 to obtain bone pieces 9.

[0062] like Figure 9 As shown, after rotating the bone piece 9 90° around its own length, it is placed back into the bone strip limiting structure 71;

[0063] The parallel blade assembly 61 is driven again to perform a second fine cut on the bone strip 9, resulting in a cut bone strip 10 with a cross-sectional size smaller than the initially cut bone strip 8.

[0064] The initial cut bone strip 8 has a cross-sectional side length of 8 mm to 12 mm; the cut bone strip 10 has a cross-sectional side length of 2 mm to 4 mm.

[0065] The cancellous bone material targeted by the device and method of the present invention includes, but is not limited to, the femoral head.

[0066] Specific embodiments of the present invention are as follows:

[0067] Example

[0068] This embodiment provides a cutting device for preparing cancellous bone strips.

[0069] In this embodiment, the coarse cutting support 2 includes a support platform 21 and two pairs of limiting brackets 22. The mesh cutter 31 has four first blades and four second blades. The intermediate connecting rod 43, push rod 44, first lever 41, and second lever 42 are connected via a drive shaft 46 and a needle roller bearing 47. The parallel blade assembly 61 includes two parallel blades fixedly mounted on the first rod 6 and located at corresponding positions on the bone strip limiting structure 71, so that the relative rotation of the first rod 6 and the second rod 7 drives the parallel blade assembly 61 to complete the cutting action. The bone strip limiting structure 71 includes a limiting groove and a limiting protrusion. The limiting protrusion is disposed on the side wall of the limiting groove to restrict the lateral and axial movement of the initial cutting bone strip 8 during the cutting process.

[0070] The working principle of the device in this embodiment is as follows:

[0071] 1) Rough cutting process

[0072] refer to Figure 3 The coarse cutting support part 2 is provided with four limiting brackets 22 around its perimeter. The limiting brackets 22 have threaded holes, and the limiting screws 23 are inserted into the threaded holes. In use, the cancellous bone material can be abutted by the limiting screws 23 in four directions, thereby adapting to cancellous bone materials of different shapes and restricting the cancellous bone material from moving horizontally during the cutting process.

[0073] refer to Figure 4 Rotate clockwise and raise the first lever 41, so that the first lever 41 drives the sliding blade holder 45 and the grid blade assembly 3 to move upward to a high position through the intermediate connecting rod 43, the second lever 42 and the push rod 44. At this time, the cancellous bone material to be cut can be placed on the support platform 21, and positioned and fixed by the limiting bracket 22 and the limiting screw 23.

[0074] refer to Figure 5 After the cancellous bone material is fixed, the first lever 41 is rotated counterclockwise and pressed down. The first lever 41 drives the second lever 42 to move through the intermediate connecting rod 43. The second lever 42 pushes the sliding blade holder 45 to move vertically downward along the linear guide mechanism 5 through the push rod 44, thereby driving the grid blade assembly 3 to move downward and cut the cancellous bone material.

[0075] refer to Figure 6 The limiting bracket 22 is distributed at the corresponding position of the blade gap of the mesh knife 31, so that the mesh knife 31 can continue to move downward to the vicinity of the support table 21, thereby cutting the cancellous bone material into multiple initial cut bone strips 8.

[0076] 2) Fine cutting process

[0077] refer to Figure 7Open the first rod 6 and the second rod 7 of the fine cutting module, and place the initial cut bone strip 8 obtained from the coarse cutting process into the bone strip limiting structure 71 on the second rod 7. The size of the bone strip limiting structure 71 matches the size of the initial cut bone strip 8 and is used to limit the lateral displacement and / or axial displacement of the initial cut bone strip 8 during the cutting process.

[0078] refer to Figure 8 A force is applied to the first rod 6 and the second rod 7 to close them relative to each other. The first rod 6 drives the parallel blade assembly 61 to move toward the bone strip limiting structure 71, so that the parallel blade assembly 61 makes the first cut on the initial cutting bone strip 8 located in the bone strip limiting structure 71, thereby obtaining the bone piece 9.

[0079] refer to Figure 9 The bone piece 9 obtained after the first cut is rotated 90° around its own length direction and placed again in the bone strip limiting structure 71. Then, the first rod 6 and the second rod 7 are closed relative to each other again, and the bone piece 9 is cut a second time by the parallel blade assembly 61, thereby forming a cut bone strip 10 with a cross-sectional side length smaller than the cross-sectional side length of the initially cut bone strip 8.

[0080] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion.

[0081] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cutting device for preparing cancellous bone strips, characterized in that, include: A coarse cutting module is used to cut cancellous bone material into initial cut bone strips (8); it includes a coarse cutting support part (2), a mesh knife assembly (3), a linear drive assembly (4), and a linear guide mechanism (5); the coarse cutting support part (2) and the mesh knife assembly (3) are arranged opposite each other in the vertical direction, and the linear drive assembly (4) can drive the mesh knife assembly (3) to reciprocate in the vertical direction on the linear guide mechanism (5); the coarse cutting support part (2) is used to place cancellous bone material, and the cutting surface of the mesh knife assembly (3) is arranged downwards; A fine cutting module is used to cut the initial cut bone strip (8) into cut bone strips (10); it includes a first rod (6) and a second rod (7), the first rod (6) and the second rod (7) are hinged together; and can rotate relative to each other around the hinge. Parallel blade assembly (61) and bone strip limiting structure (71) are respectively arranged on the opposite surfaces of the first rod (6) and the second rod (7). The bone strip limiting structure (71) forms a limiting groove, which is used to place the initial cut bone strip (8).

2. The cutting device for preparing cancellous bone strips according to claim 1, characterized in that: The linear drive assembly (4) includes a first lever (41), a second lever (42), an intermediate connecting rod (43), a push rod (44), a sliding knife holder (45), and a support seat (48); the support seat (48) adopts a U-shaped structure, the U-shaped structure includes a bottom wall and a first side arm and a second side arm extending upward from the bottom wall, the height of the first side arm is lower than that of the second side arm; the free end of the first side arm is hinged to the middle of the first lever (41), and the free end of the second side arm is hinged to the middle of the second lever (42); the adjacent ends of the first lever (41) and the second lever (42) are respectively hinged to the two ends of the intermediate connecting rod (43); The end of the first lever (41) away from the second lever (42) is used as the driving end of the linear drive assembly (4). The end of the second lever (42) away from the first lever (41) is hinged to one end of the push rod (44). The other end of the push rod (44) is hinged to the sliding blade holder (45). The sliding blade holder (45) is slidably engaged with the linear guide mechanism (5). A grid blade assembly (3) is mounted on the sliding blade holder (45).

3. The cutting device for preparing cancellous bone strips according to claim 2, characterized in that: The mesh blade assembly (3) includes a mesh blade (31); the mesh blade (31) includes a plurality of first blades arranged at equal intervals along a first direction and a plurality of second blades arranged at equal intervals along a second direction, the first direction and the second direction being perpendicular to each other and both being parallel to the horizontal direction; the first blades and the second blades are arranged intersectingly to form a mesh-like cutting edge.

4. The cutting device for preparing cancellous bone strips according to claim 3, characterized in that: In the grid blade (31), the spacing between adjacent first blades is equal to the spacing between adjacent second blades, so that the grid-shaped cutting blades form multiple cutting units arranged in a square. The cutting unit is used to form a preliminary cutting strip (8) in the effective cutting area of ​​the cancellous bone material. The length of the preliminary cutting strip (8) corresponds to the thickness of the cancellous bone material in the cutting direction. The cross-sectional shape of the preliminary cutting strip (8) along the length direction corresponds to the shape of the cutting unit. When the initial cut bone strip (8) is placed into the limiting groove, the length direction of the initial cut bone strip (8) is parallel to the length direction of the limiting groove and the parallel blade assembly (61).

5. The cutting device for preparing cancellous bone strips according to claim 3, characterized in that: The mesh cutter assembly (3) also includes a cutter extension bracket (32), which is arranged between the mesh cutter (31) and the sliding cutter holder (45). The mesh cutter (31) and the sliding cutter holder (45) are connected by the cutter extension bracket (32).

6. The cutting device for preparing cancellous bone strips according to claim 1, characterized in that: The coarse cutting support part (2) includes a support platform (21) and at least four limiting brackets (22). Each limiting bracket (22) is evenly arranged on the support platform (21) at intervals along the same circumference. Each limiting bracket (22) is provided with a limiting screw (23). The limiting screw (23) is arranged radially along the circumference and is threadedly connected to the limiting bracket (22). The middle part of the support platform (21) is used to place the cancellous bone material. When the limiting screws (23) on each limiting bracket (22) are tightened, the limiting screws (23) abut against the cancellous bone material, thereby fixing the cancellous bone material.

7. The cutting device for preparing cancellous bone strips according to claim 6, characterized in that: The limiting bracket (22) is staggered with the blade of the grid blade assembly (3), and each limiting bracket (22) is located between two adjacent blades of the grid blade assembly (3).

8. A method for preparing cancellous bone strips, characterized in that, The method for preparing cancellous bone strips uses the cutting device for preparing cancellous bone strips as described in any one of claims 1 to 7, and includes the following steps: placing cancellous bone raw material on the coarse cutting support part (2) of the coarse cutting module; driving the grid knife assembly (3) to move downward along the linear guide mechanism (5) through the linear drive assembly (4), so that the grid knife assembly (3) cuts the cancellous bone raw material to obtain a preliminary cut bone strip (8); placing the preliminary cut bone strip (8) in the bone strip limiting structure (71) of the fine cutting module; rotating the first rod (6) and the second rod (7) relative to each other, and using the parallel blade assembly (61) to perform a first fine cut on the preliminary cut bone strip (8) to obtain a bone piece (9); rotating the bone piece (9) 90° around its own length direction and placing it again in the bone strip limiting structure (71); using the parallel blade assembly (61) again to perform a second fine cut on the bone piece (9) to obtain a cut bone strip (10).

9. The method for preparing cancellous bone strips according to claim 8, characterized in that: The initial cut bone strip (8) has a cross-sectional side length of 8 mm to 12 mm; the cut bone strip (10) has a cross-sectional side length of 2 mm to 4 mm.

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