Bone grain extractor
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-24
- Publication Date
- 2026-04-03
AI Technical Summary
Current techniques for bone harvesting in orthopedic surgery result in large wounds and low efficiency, requiring additional tools to cut the bone and prolonging the operation time.
Design a bone fragment extractor, including a cannula and a bone cutter. By rotating the cannula, the bone strip is cut off under the limiting action of the bone cutter to form bone fragments, thereby reducing the wound area and improving efficiency.
It achieves minimally invasive and efficient bone granulation, shortens surgical time, and allows for the direct extraction of suitable bone granules without the need for additional tools to cut the bone.
Smart Images
Figure CN224070523U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, specifically a bone particle extractor. Background Technology
[0002] Bone grafting is frequently required during orthopedic surgery. Common bone grafting methods include artificial bone, allogeneic bone, and autologous bone, with autologous bone being the best choice. When using autologous bone for grafting, the surgeon needs to harvest bone from the patient's iliac crest.
[0003] Currently, bone harvesting methods generally employ bone scalpels or bone drills. Using a bone scalpel results in a larger wound for the patient; while using a bone drill creates a smaller wound, it is less efficient and makes it difficult to cut the bone, requiring the use of other tools for bone fragmentation, thus prolonging the harvesting time and extending the surgical duration. Furthermore, regardless of whether a bone scalpel or bone drill is used, the harvested bone must be cut using a bone fragmentation device. Utility Model Content
[0004] To address the aforementioned issues, this application provides a bone particle extractor that not only minimizes the wound area but also allows for the direct extraction of bone particles during the bone removal process, eliminating the need for subsequent transection.
[0005] The technical solution adopted by this utility model to solve its technical problem is:
[0006] A bone fragment extractor includes a sleeve, which, from back to front, includes a material storage section and a bone fragmentation section, and a bone cutting knife is provided in the bone fragmentation section.
[0007] When the sleeve rotates, the bone strips that have entered the bone fragment section can be cut off from the root under the limiting action of the bone cutting knife, thereby forming bone particles.
[0008] Furthermore, the cutting edge of the osteotome is aligned with the annular cutting edge of the sleeve.
[0009] Furthermore, the bone-cutting knife includes a plurality of first blades, and the plurality of first blades divide the internal space of the bone fragment into a plurality of subspaces that extend along the axial direction of the sleeve.
[0010] Furthermore, the bone-cutting knife includes several first blades arranged radially.
[0011] Furthermore, several of the first blades are arranged in a grid structure.
[0012] Furthermore, the bone-cutting knife includes several second blades disposed on the inner side of the sleeve.
[0013] Furthermore, the cannula includes a main body and a bone-removing device disposed at the front end of the main body, and the osteotome is disposed inside the bone-removing device.
[0014] Furthermore, the sleeve is provided with a handle at its rear end, and the handle is provided with a mounting hole that extends through the handle in the front-to-back direction. The rear end of the sleeve is inserted into the mounting hole and fixedly connected to the handle.
[0015] Furthermore, the handle comprises, from back to front, a striking head and a grip sleeve. The striking head is made of metal, the sleeve is fixedly connected to the striking head, and the grip sleeve is fixedly connected to both the striking head and the sleeve.
[0016] The beneficial effects of this utility model are:
[0017] This application provides a bone granulation extractor that uses a bone-cutting blade at the front end of a cannula, combined with a twisting motion, to break the obtained bone strip into bone granules. Using this bone granulation extractor results in a smaller wound area, higher efficiency, and eliminates the need for additional tools to break the bone, thus shortening the surgical time. Furthermore, it allows for the direct acquisition of bone granules for grafting during the bone harvesting process, eliminating the need for subsequent cutting after bone removal, thereby improving surgical efficiency. Attached Figure Description
[0018] Figure 1 A three-dimensional structural diagram of a bone particle extractor provided in this application embodiment. Figure 1 ;
[0019] Figure 2 for Figure 1 A magnified structural diagram of part A in the middle;
[0020] Figure 3 A three-dimensional structural diagram of a bone particle extractor provided in this application embodiment. Figure 2 ;
[0021] Figure 4 A side view of a bone particle extractor provided in an embodiment of this application;
[0022] Figure 5 for Figure 4 AA section view in the middle;
[0023] Figure 6 for Figure 5 A magnified structural diagram of part B in the middle section;
[0024] Figure 7 for Figure 5 A magnified structural diagram of section C;
[0025] Figure 8 This is a schematic diagram of the bone-cutting knife in Example 2;
[0026] Figure 9 This is a schematic diagram of the bone-cutting knife in Example 3;
[0027] Figure 10 This is a schematic diagram of the bone-cutting knife in Example 4.
[0028] In the diagram: 1. Sleeve; 11. Main body; 12. Bone extraction; 131. Storage section; 132. Bone fragmentation section; 1321. Subspace;
[0029] 2. Bone cutter; 21. First blade; 22. Second blade;
[0030] 3. Handle; 31. Striking head; 311. Sixth hole section; 32. Grip sleeve. Detailed Implementation
[0031] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be described in detail below with reference to the accompanying drawings. The described embodiments are merely a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort should fall within the protection scope of this application.
[0032] For ease of description, the coordinate system is defined as follows: Figure 1 As shown, the left and right directions are horizontal, the front and back directions are vertical, and the up and down directions are vertical.
[0033] Example 1
[0034] like Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, a bone fragment extractor includes a sleeve 1. The sleeve 1, from back to front, includes a storage section 131 and a bone fragmentation section 132. A bone-cutting blade 2 is disposed within the bone fragmentation section 132, and the cutting edge of the bone-cutting blade 2 is aligned with the annular cutting edge of the sleeve 1. When the sleeve 1 rotates around its own axis, under the limiting action of the bone-cutting blade 2, bone fragments entering the bone fragmentation section 132 can be cut off from their root, thereby forming bone fragments. A handle 3 is provided at the rear end of the sleeve 1.
[0035] like Figure 2As shown, the osteotome 2 includes several first blades 21, which divide the internal space of the bone fragmentation section 132 into several sub-spaces 1321, all of which are axially connected to the sleeve 1. None of the sub-spaces 1321 have a circular cross-section and are coaxially arranged with the sleeve 1. When the sleeve 1 is inserted into the patient's iliac bone by tapping, the osteotome 2 located within the bone fragmentation section 132 can cut and separate the bone fragments that have entered the section, thus forming thinner bone fragments with smaller cross-sections. Twisting the sleeve 1 at this point allows for easy bone breakage, forming bone particles; furthermore, the shape of the osteotome 2 can be selected according to the needs of the surgery to obtain bone particles of the appropriate size.
[0036] In one specific embodiment, the bone-cutting knife 2 described in this embodiment includes a plurality of first blades 21 radially distributed, and the plurality of first blades 21 are evenly arranged in the circumferential direction. For example, the bone-cutting knife 2 includes four first blades 21, and the four first blades 21 together form a cross-shaped structure.
[0037] Furthermore, such as Figure 2 , Figure 5 and Figure 7 As shown, the sleeve 1 includes a main body 11 and a bone-removing section 12 disposed at the front end of the main body 11. The bone-removing section 12 has a cylindrical structure with openings at both ends and is coaxially arranged with the main body 11. The bone-cutting knife 2 is disposed inside the bone-removing section 12, and the internal space of the bone-removing section 12 is the bone-fragmenting part 132. The space of the main body 11 located behind the bone-removing section 12 is the material storage part 131. By designing the sleeve 1 as a split structure, it is beneficial to reduce the processing difficulty and processing cost.
[0038] In one specific embodiment, the rear end face of the bone-cutting knife 2 is flush with the rear end face of the bone-removing bone 12.
[0039] As one specific implementation method, such as Figure 7 As shown, in this embodiment, the inner hole of the main body 11 is stepped, comprising a first hole segment and a second hole segment from front to back, with the diameter of the first hole segment being larger than the diameter of the second hole segment, and a first stepped surface forming between the first hole segment and the second hole segment. The rear end of the bone retrieval bone 12 is inserted into the first hole segment and abuts against the first stepped surface. The outer diameter of the bone retrieval bone 12 is equal to the inner diameter of the first hole segment, and it is fixedly connected to the main body 11 by an interference fit.
[0040] Here, the bone extraction 12 can also be fixedly connected to the main body 11 by welding or threaded connection.
[0041] In one specific implementation, the bone removal 12 and the bone cutting knife 2 described in this embodiment are an integral structure and are processed by wire cutting.
[0042] Furthermore, such as Figure 5 and Figure 6 As shown, the handle 3 is provided with a mounting hole that extends through the handle 3 in the front-to-back direction. The rear end of the sleeve 1 is inserted into the mounting hole and fixedly connected to the handle 3.
[0043] In this way, once the bone harvesting is complete, the bone particles stored in the cannula 1 can be poured out through the mounting hole on the handle 3 at the rear end. Even if the bone particles stored in the cannula 1 cannot flow out of the mounting hole on the handle 3 by themselves, the bone particles in the cannula 1 can be pushed out by inserting a rod into the cannula 1 from the front end.
[0044] In one specific embodiment, the handle 3 in this example includes, from back to front, a striking head 31 and a grip sleeve 32, wherein the striking head 31 is made of metal. The inner hole of the grip sleeve 32 includes a third segment and a fourth segment from front to back, wherein the diameter of the third segment matches the outer diameter of the main body 11 of the sleeve 1, and the shape of the fourth segment matches the external shape of the front end of the striking head 31. The front end of the striking head 31 is inserted into the fourth segment and fixedly connected to the grip sleeve 32. The striking head 31 has a through hole extending through it in the front-back direction. The through hole is stepped and includes a fifth segment and a sixth segment 311 from front to back. The diameter of the fifth segment is larger than the diameter of the sixth segment 311, and a second stepped surface is formed between the fifth segment and the sixth segment 311. The through hole and the third hole section of the inner hole of the grip sleeve 32 together form the mounting hole, and the rear end of the main body 11 of the sleeve 1 passes through the third hole section and the fifth hole section in sequence and then abuts against the second step surface. The third hole section of the inner hole of the grip sleeve 32 is fixedly connected to the main body 11 of the sleeve 1.
[0045] During bone retrieval, first select a suitable location and place the tip of the bone extractor (i.e., the bone fragment 12) against the selected location. Then, use a bone hammer to strike the striking head 31 of the bone extractor, causing the bone fragment 12 to enter the iliac bone. After each entry to a certain depth, rotate the handle 3, which breaks the bone fragments within the bone fragmentation section 132. Continue striking the bone extractor; as it continues to penetrate, the bone fragments within the bone fragmentation section 132 are pushed into the storage section 131 behind the bone fragment 12 by the newly formed bone fragments. After the bone extractor has entered to a certain depth again, rotate the handle 3 again, breaking the bone fragments within the bone fragmentation section 132 and forming new bone fragments. Repeat the above steps until the required amount of bone is retrieved.
[0046] Example 2
[0047] like Figure 8 As shown, the bone-cutting knife 2 includes three first blades 21 arranged radially, and several of the first blades 21 are evenly arranged in the circumferential direction, that is, the included angle between two adjacent first blades 21 is 120°. The rest of the structure is the same as in Embodiment 1.
[0048] Example 3
[0049] according to Figure 1 The coordinate system shown is as follows: Figure 9 As shown, the bone cutter 2 includes a plurality of first blades 21 extending laterally and a plurality of first blades 21 extending vertically, and the first blades 21 extending laterally and vertically together form a grid structure. For example, the bone cutter 2 includes two first blades 21 extending laterally and two first blades 21 extending vertically. The remaining structure is the same as in Embodiment 1.
[0050] Example 4
[0051] like Figure 10 As shown, the bone-cutting knife 2 includes several second blades 22, which are disposed on the inner side of the bone-removing 12 and are evenly arranged in the circumferential direction.
[0052] In one specific implementation, four second blades 22 are evenly distributed along the circumferential direction on the inner sidewall of the bone-removing 12 described in this embodiment.
[0053] In one specific embodiment, the thickness of the second blade 22 gradually decreases along the direction close to the axis of the bone 12, and forms a tip pointing towards the axis of the bone 12.
[0054] The rest of the structure is the same as in Example 1.
[0055] Other embodiments obtained by those skilled in the art based on the embodiments provided in this application by combining, splitting, or reorganizing the embodiments of this application do not exceed the protection scope of this application.
[0056] The above detailed embodiments have provided a detailed explanation of the purpose, technical solutions, and beneficial effects of the embodiments of this application. The above are merely specific embodiments of the embodiments of this application and are not intended to limit the protection scope of the embodiments of this application. That is, any modifications, equivalent substitutions, improvements, etc., made on the basis of the embodiments of this application should be included within the protection scope of the embodiments of this application.
Claims
1. A bone spicule extractor characterized by: The application relates to a bone cutting device, which comprises a sleeve (1) sequentially comprising a storage part (131) and a bone crushing part (132) from back to front, and a bone cutting knife (2) arranged in the bone crushing part (132). When the sleeve (1) rotates, the bone strips entering the bone crushing part (132) can be cut off from the roots under the limiting action of the bone cutting knife (2), so that bone grains are formed.
2. A bone spicule extractor according to claim 1, wherein: The blade edge of the front end of the bone cutting knife (2) is aligned with the annular blade edge of the front end of the sleeve (1).
3. A bone spicule extractor according to claim 1, wherein: The bone cutting knife (2) comprises a plurality of first blades (21), and the plurality of first blades (21) divide the internal space of the bone crushing part (132) into a plurality of subspaces (1321) penetrating along the axial direction of the sleeve (1).
4. A bone spicule extractor according to claim 3, wherein: The bone cutting knife (2) comprises a plurality of first blades (21) distributed in a radial direction.
5. A bone spicule extractor according to claim 3, wherein: The plurality of first blades (21) are arranged in a grid structure.
6. A bone spicule extractor according to claim 1, wherein: The bone cutting knife (2) comprises a plurality of second blades (22) arranged on the inner side of the sleeve (1).
7. A bone spicule extractor according to claim 1, wherein: The sleeve (1) comprises a main pipe body (11) and a bone taking head (12) arranged at the front end of the main pipe body (11), and the bone cutting knife (2) is arranged in the bone taking head (12).
8. A bone spicule extractor according to claim 1, wherein: The rear end part of the sleeve (1) is provided with a handle (3), the handle (3) is provided with a mounting hole penetrating the handle (3) in the front-rear direction, the rear end part of the sleeve (1) is inserted into the mounting hole, and the handle (3) is fixedly connected with the sleeve (1).
9. A bone spicule extractor according to claim 8, wherein: The handle (3) sequentially comprises a knocking head (31) and a holding sleeve (32) from back to front, the knocking head (31) is made of metal material, the sleeve (1) is fixedly connected with the knocking head (31), and the holding sleeve (32) is fixedly connected with the knocking head (31) and the sleeve (1) respectively.