Annular cutter for taking strip-shaped bones

Abstract

The utility model discloses an annular cutter for taking strip-shaped bones, which relates to the technical field of medical instruments and comprises a tubular cutter body, cutting edges are arranged at the cutting end of the cutter body and comprise a first cutting edge and a second cutting edge, the first cutting edge is zigzag, and the second cutting edge is zigzag. The orientation of the first cutting edge is parallel to the axial direction of the cutter body; and the second cutting edge is inclined towards the inner side of the cutter body. In the using process, by swinging the cutter in the radial direction, the root of the obtained strip-shaped bone can be cut off through the second cutting edge, that is, the connection between the strip-shaped bone in the cutter and the surrounding bone tissue is cut off, and the root cutting operation can be conveniently carried out when the strip-shaped bone is taken.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a ring-shaped cutting tool for removing strips of bone. Background Technology

[0002] Bone grafting is widely used to repair bone defects caused by trauma, disease, and surgery. Autologous bone grafting involves harvesting bone tissue from a suitable site on the patient's own body and transplanting it to the site of the bone defect. To obtain intact strips of bone, trephine structures are often used in autologous bone grafting procedures. However, existing trephine structures have many problems in drilling bone tissue and still have significant room for improvement.

[0003] To obtain strips of autologous bone, trephine structures are often used in autologous bone grafting procedures. In traditional bone harvesting surgery, surgeons manually drill strips of bone using a trephine structure, but the high hardness of bone tissue makes the procedure difficult. Therefore, modern trephine structures aim to better connect the trephine structure and the drive mechanism, enabling motor-driven trephine drilling to extract bone tissue.

[0004] Chinese utility model patent CN206934140U discloses a bone drill for bone harvesting, comprising a hollow drill bit, a cutting edge, a solid connecting rod, a connector, and a pusher. The hollow drill bit is tubular, with a serrated cutting edge on one end face, and the other end connected to the solid connecting rod, which is detachably connected. The outer end of the solid connecting rod has a connector that can be connected to an electric drill. The outer diameter of the pusher is adapted to the inner diameter of the hollow drill bit, and the pusher can be inserted into the inner cavity of the hollow drill bit to completely push out the bone from the inner cavity. This utility model's bone drill is used in conjunction with a bone drill main unit. Before bone retrieval, the connector is first connected to the hollow drill bit, and then the connector is installed on the bone drill main unit. The bone drill main unit is started, and the cutting edge on the hollow drill bit is aligned with the location where bone needs to be retrieved. During use, the retrieved bone tissue will continuously move upward along the inner wall of the hollow drill bit, preventing the bone tissue from detaching from the lower end of the hollow drill bit. After bone retrieval, the hollow drill bit and connector are disconnected, and a pusher is used to push the bone tissue out of the hollow drill bit. However, this existing technology does not contain any description of how to perform root severing after the hollow drill bit has drilled into place.

[0005] The biggest problem with existing trephine drilling systems, whether manual or electric, is how to sever the root of the bone. Trephine systems generally only involve a single vertical cut, and in practical use, severing the connection between the strip-shaped bone root and the surrounding bone tissue within the trephine cavity (i.e., root severance) is a technical challenge. At the same time, improving the loading efficiency of the trephine and preventing material from falling out during transfer are also issues that need improvement. Utility Model Content

[0006] The purpose of this invention is to provide a ring-shaped tool for removing strip-shaped bones, so as to solve the problems existing in the prior art and facilitate the root cutting operation when removing strip-shaped bones.

[0007] To achieve the above objectives, this utility model provides the following solution:

[0008] This utility model provides a ring-shaped tool for removing strip-shaped bones, comprising a tubular tool body, wherein the cutting end of the tool body is provided with a cutting edge, the cutting edge including a first cutting edge and a second cutting edge, the first cutting edge being serrated and the orientation of the first cutting edge being parallel to the axial direction of the tool body; the second cutting edge being inclined toward the inner side of the tool body and the other end of the tool body.

[0009] Preferably, the cross-section at the connection between the second cutting edge and the tool body is used as the reference plane, and the angle between the second cutting edge and the reference plane is A, where 0°≤A<90°.

[0010] Preferably, the second cutting edge occupies 5% to 85% of the circumference of the cutting end in the circumferential direction of the tool body.

[0011] Preferably, the diameter of the tube is the same at all parts of the tool body.

[0012] Preferably, the tool body is a tapered tube, and the diameter of the tool body gradually increases from the cutting end to the other end of the tool body.

[0013] Preferably, the length of the tool body is 20mm-180mm, the outer diameter of the cutting end of the tool body is 2mm-20mm, and the wall thickness of the tool body is 0.2mm-2mm.

[0014] The present invention achieves the following technical advantages over the prior art:

[0015] The ring-shaped cutter of this invention for removing strip-shaped bones can sever the root of the removed strip-shaped bone by oscillating the cutter radially during use, thereby facilitating the root severing operation when removing strip-shaped bones.

[0016] Furthermore, during use, the second cutting edge of the annular cutter for extracting strip-shaped bone of this invention can also support the strip-shaped bone already extracted within the cutter. In actual operation, when transferring bone tissue using a conventional trephine structure, the bone tissue inside the trephine often falls off. However, the inward and backward bending design of the second cutting edge in this invention can effectively support the strip-shaped bone within the multi-dimensional cutting tool, preventing the cut strip-shaped bone from falling off. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural schematic diagram of the annular cutting tool for removing strip-shaped bone according to the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the ring-shaped knife for removing strip-shaped bones according to this utility model;

[0020] in:

[0021] 100. A ring-shaped cutting tool used to remove strips of bone;

[0022] 1. Tool body;

[0023] 2. First cutting edge;

[0024] 3. Second cutting edge. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] The purpose of this invention is to provide a ring-shaped tool for removing strip-shaped bones, so as to solve the problems existing in the prior art and facilitate the root cutting operation when removing strip-shaped bones.

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figures 1 to 2 As shown, this embodiment provides a ring-shaped tool 100 for removing strip-shaped bones, including a tubular tool body 1. The cutting end of the tool body 1 is provided with a cutting edge, which includes a first cutting edge 2 and a second cutting edge 3. The first cutting edge 2 is serrated and its orientation is parallel to the axial direction of the tool body 1. The second cutting edge 3 is inclined toward the inner side of the tool body 1 and the other end of the tool body 1.

[0029] Since the second cutting edge 3 in this embodiment is inclined toward the inner side of the tool body 1 and the end of the tool body 1 away from the cutting end, the rotating second cutting edge 3 can play the following three roles during the tool's operation:

[0030] (1) Feeding function: The angle of the second cutting edge 3 bending inward and backward (i.e. the end of the tool body 1 away from the cutting end) provides an upward force for the material (already cut aggregate) to be transported. That is, it provides a force for the material to move in the tool body 1 towards the end of the tool body 1 away from the cutting end. It can assist the strip-shaped aggregate in the tool to be transported along the inner wall of the sleeve to the rear end to the rotating collection bin, making the feeding smoother and faster.

[0031] (2) Root cutting, which involves severing the connection between the strip bone and the surrounding bone tissue inside the tool. Conventional trephine structures can drill strip bone, but how to completely remove the strip bone from the bone harvesting tissue is a technical challenge. The second cutting edge 3, which cuts inward, can solve this problem well. After obtaining a sufficient amount of strip bone through the vertical cutting edge 2 and entering the sleeve, the tool is oscillated so that the second cutting edge 3 at the tip of the tool cuts the root of the strip bone horizontally, severing the connection between the root of the strip bone and the surrounding bone tissue, thereby obtaining a complete strip of autologous bone.

[0032] (3) Support function: The second cutting edge 3 can support the strip bone that has been obtained in the tool. In actual operation, when transferring bone tissue, the bone tissue in the conventional trephine structure often falls off. However, the inward and backward bending structure of the second cutting edge 3 in this utility model can well support the strip bone in the multi-dimensional cutting tool and prevent the cut strip bone from falling off.

[0033] Regarding the three functions of the second cutting edge 3 mentioned above, the setting parameter of the inclination angle of the second cutting edge 3 is crucial. A reasonable inclination angle setting can realize material transfer and control the transfer speed, control the amount of bone extracted, and prevent bone tissue from clogging or falling out inside the tool. Based on a large amount of experimental data on the application tool, taking the radial section at the connection between the second cutting edge 3 and the tool body 1 as the reference plane, the angle between the second cutting edge 3 cutting inward and the reference plane is... Figure 2 Angle A in the tool body 1, and 0°≤A<90°, the second cutting edge 3 occupies 5% to 85% of the circumference of the cutting end in the circumferential direction of the tool body 1.

[0034] In the optional embodiments of this example, it is more preferred that the tool body 1 is a tapered tube, and the diameter of the tool body 1 gradually increases from the cutting end to the other end. In practical applications, the diameter of the tool body 1 can be adaptively adjusted according to actual needs, for example, to make the diameter of the tool body 1 uniform throughout.

[0035] In the optional schemes of this embodiment, it is more preferred that the length of the tool body 1 is 20mm-180mm, the outer diameter of the cutting end of the tool body 1 is 2mm-20mm, and the wall thickness of the tool body 1 is 0.2mm-2mm.

[0036] The outer diameter of the cutting end of the blade body 1, ranging from 2mm to 20mm, is designed to achieve both minimal incision and the acquisition of intact bone strips. Within this diameter, bone harvesting can be performed through minimal incisions, while also obtaining intact bone strips sufficient for grafting. A safety limiting step formed at the connection between the blade body 1 and the rotating collection chamber allows the blade to enter the patient's bone tissue but restricts the entry of large-diameter components such as the rotating collection chamber, ensuring surgical safety. The length of the blade body 1, set between 20mm and 180mm, is intended to ensure sufficient bone tissue is harvested from donor sites such as the iliac bone without penetrating the contralateral cortical bone.

[0037] In the description of this utility model, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A ring-shaped cutting tool for removing strips of bone, characterized in that: The tool includes a tubular tool body, the cutting end of which is provided with a cutting edge, the cutting edge including a first cutting edge and a second cutting edge, the first cutting edge being serrated and its orientation being parallel to the axial direction of the tool body; the second cutting edge being inclined toward the inner side of the tool body.

2. The annular cutting tool for removing strip-shaped bone according to claim 1, characterized in that: The cross-section at the connection between the second cutting edge and the tool body is taken as the reference plane, and the angle between the second cutting edge and the reference plane is A, where 0°≤A<90°.

3. The annular cutting tool for removing strip-shaped bone according to claim 1, characterized in that: The second cutting edge occupies 5% to 85% of the circumference of the cutting end in the circumferential direction of the tool body.

4. The annular cutting tool for removing strip-shaped bone according to claim 1, characterized in that: The diameter of the tube is consistent throughout the tool body.

5. The annular cutting tool for removing strip-shaped bone according to claim 1, characterized in that: The tool body is a tapered tube, and the diameter of the tool body gradually increases from the cutting end to the other end of the tool body.

6. The annular cutting tool for removing strip-shaped bone according to claim 5, characterized in that: The length of the tool body is 20mm-180mm, the outer diameter of the cutting end of the tool body is 2mm-20mm, and the wall thickness of the tool body is 0.2mm-2mm.

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