Bone grafting device

Abstract

The present disclosure relates to a bone grafting device for osteochondral transplantation, comprising a bone grafting device body, a connecting rod and a positioning device, wherein the bone grafting device body has a receiving cavity which forms an open end at the lower end of the bone grafting device body, and the edge of the open end is provided with a ring of sawteeth; one end of the connecting rod is connected with the bone grafting device body, and the other end is used for connecting a driving device; the positioning device is configured to be guidedly matched with the bone grafting device body or the connecting rod, and is configured to be axially displaced relative to the bone grafting device body or the connecting rod, and the lower end of the positioning device is configured to be a positioning part for positioning the osteochondral tissue. The bone grafting device of the present disclosure can ensure that the bone grafting device is accurately placed at a predetermined position by providing the positioning device, so that the cutting process is more accurate, and the positioning device can be axially displaced to accurately control the depth of the bone grafting device into the bone, thereby avoiding the problems of excessive or insufficient bone grafting.

Description

Technical Field

[0001] This disclosure relates to the field of osteochondral allogeneic transplantation technology, and specifically to a bone harvesting device for osteochondral transplantation. Background Technology

[0002] In orthopedic, trauma surgery, and bone transplantation surgeries, medical bone harvesting devices are used as key instruments for obtaining autologous bone grafts and are widely applied in various clinical scenarios such as spinal fusion, fracture repair, dental implants, and plastic and reconstructive surgery.

[0003] However, most medical bone harvesting devices currently on the market suffer from inaccurate positioning. On the one hand, bone harvesting operations usually rely on the doctor's manual operation and experience judgment. In complex bone areas, doctors often find it difficult to accurately control the location, depth, and direction of the bone harvest, which can easily lead to unsatisfactory bone harvesting or unnecessary damage to the donor area. Utility Model Content

[0004] In order to solve the problems existing in the prior art, this disclosure provides the following technical solution: This disclosure provides a bone harvesting device for osteochondral transplantation, comprising: The bone harvester body is configured to have a receiving cavity, the receiving cavity being configured to form an open end at the lower end of the bone harvester body; a ring of serrations is provided at the edge of the open end of the bone harvester body. A connecting rod, one end of which is configured to connect to the bone harvester body, and the other end of which is configured to connect to a drive device; A positioning device is configured to guide and engage with the bone harvester body or connecting rod, and is configured to be axially displaced relative to the bone harvester body or connecting rod, the lower end of the positioning device being configured as a positioning portion for positioning with osteocartilage.

[0005] In one embodiment of this disclosure, the positioning device includes a positioning sleeve having an inner cavity for guiding and engaging with the outer wall of the bone harvester body; the bone harvester body passes through the inner cavity of the positioning sleeve and engages with osteochondral bone; the outer wall of the positioning device is configured for handheld use, and the positioning portion is the bottom edge of the positioning sleeve.

[0006] In one embodiment of this disclosure, the upper end of the outer wall of the positioning bushing is provided with a radially outwardly extending bent portion.

[0007] In one embodiment of this disclosure, the positioning device includes a positioning rod, the connecting rod being configured to have a guide channel extending through the receiving cavity; the positioning rod being configured to pass through the guide channel and through the receiving cavity; and the positioning portion being the bottom of the positioning rod.

[0008] In one embodiment of this disclosure, the bottom of the positioning rod is configured as a pointed structure.

[0009] In one embodiment of this disclosure, a notch extending through the receiving cavity is provided on the side wall of the bone harvester body.

[0010] In one embodiment of this disclosure, two notches are provided, and the two notches are distributed on opposite sides of the bone harvester body.

[0011] In one embodiment of this disclosure, a scale is provided on the side wall of the bone harvester body, the scale being configured to count upwards from the bottom of the bone harvester body.

[0012] In one embodiment of this disclosure, a nut is provided at the top of the bone harvester body, and the connecting rod is configured to be threadedly connected to the nut.

[0013] In one embodiment of this disclosure, the end of the connecting rod away from the bone harvester body is configured to be flat for bonding with the drive device.

[0014] The present disclosure provides a bone harvester for osteochondral transplantation. By setting a positioning device, the bone harvester can be accurately placed in a predetermined position, thereby making the cutting process more precise. The positioning device can be displaced axially, which can precisely control the depth of the bone harvester entering the bone and avoid the problems of excessive or insufficient bone harvesting.

[0015] Other features and advantages of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments of the present disclosure and, together with their description, serve to explain the principles of the present disclosure.

[0017] Figure 1 This is a schematic diagram of the structure of a bone harvesting device for osteochondral transplantation provided in an embodiment of this disclosure; Figure 2 This is a schematic diagram of the structure of the bone harvester body provided in one embodiment of the present disclosure; Figure 3 This is a schematic diagram of the structure of a positioning bushing provided in an embodiment of the present disclosure; Figure 4 This is a schematic diagram of the structure of a connecting rod provided in one embodiment of this disclosure.

[0018] Figures 1 to 4 The one-to-one correspondence between the component names and the reference numerals in the figures is as follows: 1. Bone harvester body; 11. Receiving cavity; 12. Sawtooth; 13. Notch; 2. Connecting rod; 21. Guide channel; 3. Positioning device; 31. Positioning part; 32. Positioning bushing; 321. Bending part; 33. Positioning rod; 4. Nut. Detailed Implementation

[0019] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present disclosure.

[0020] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use.

[0021] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0023] In this article, terms such as "up," "down," "front," "back," "left," and "right" are used only to indicate the relative positional relationship between related parts, rather than to define the absolute position of these related parts.

[0024] In this article, "first," "second," etc., are used only to distinguish one another, and not to indicate degree of importance, order, or prerequisite for each other.

[0025] In this document, terms such as “equal” and “same” are not strict mathematical and / or geometric limitations, but also include errors that are understandable to those skilled in the art and permissible in manufacturing or use.

[0026] This disclosure relates to a bone harvester for osteochondral transplantation, comprising a harvester body, a connecting rod, and a positioning device. The harvester body is cylindrical and has an internal cavity for accommodating excised bone tissue. The cavity has an opening at its lower end, with a serrated edge. One end of the connecting rod is connected to the harvester body, and the other end is connected to a driving device. Driven by the driving device, the connecting rod rotates the harvester body, and the serrated edge rotates and cuts at a predetermined position on the target bone fragment. The excised bone tissue enters the cavity. During this process, the positioning device guides and engages with the harvester body or the connecting rod, and is axially displaced relative to the harvester body or the connecting rod. The lower end of the positioning device is a positioning part for positioning the osteochondral bone fragment. The positioning part contacts the predetermined position on the target bone fragment, and the positioning device effectively prevents the harvester from shifting during the cutting process.

[0027] The bone harvester disclosed herein for osteochondral transplantation, by setting a positioning device, can ensure that the bone harvester is accurately placed in a predetermined position, thereby making the cutting process more precise. Furthermore, the positioning device can be displaced axially, which can precisely control the depth to which the bone harvester enters the bone, avoiding the problems of harvesting too deeply or too little bone.

[0028] For ease of understanding, please refer to the following: Figures 1 to 4 The present invention will describe in detail the specific structure and working principle of a bone harvester for osteochondral transplantation using an embodiment.

[0029] refer to Figures 1 to 4 This disclosure provides a bone harvester for osteochondral transplantation, including a bone harvester body 1, a connecting rod 2, and a positioning device 3. The bone harvester body 1 has a receiving cavity 11, and the receiving cavity 11 forms an open end at the lower end of the bone harvester body 1. The edge of the open end is provided with a ring of serrations 12. One end of the connecting rod 2 is connected to the bone harvester body 1, and the other end is used to connect to a driving device. The positioning device 3 is configured to guide and cooperate with the bone harvester body 1 or the connecting rod 2, and is configured to be able to be displaced axially relative to the bone harvester body 1 or the connecting rod 2. The lower end of the positioning device 3 is a positioning part 31 for positioning with the osteochondral.

[0030] Specifically, the bone harvester body 1 is tubular, with an internal receiving cavity 11 for receiving the cut bone tissue. The lower end of the receiving cavity 11 forms an open end, and the edge of the open end is provided with a ring of serrations 12. The serrations 12 serve as the cutting edge for cutting bone tissue, and can effectively cut into the bone and obtain complete columnar bone blocks during rotation. Each tooth tip of the serrations 12 can serve as an independent cutting point, which can effectively disperse the cutting force and reduce the axial thrust required for the drill bit to cut into the bone. Moreover, the serrations 12 form continuous multi-point cutting during rotation, which effectively speeds up the cutting speed of bone tissue compared to flat or single-edged designs.

[0031] The bone harvester disclosed herein also includes a connecting rod 2. One end of the connecting rod 2 is connected to the top of the bone harvester body 1, and the other end is connected to a driving device. The driving device can be an electric surgical power system, a pneumatic surgical motor, etc., used to provide driving force for the bone drilling process. The connecting rod 2 can transmit the driving force of the driving device to the bone harvester body 1, thereby realizing the bone cutting and harvesting operation. In this embodiment, the driving device can drive the connecting rod 2 to rotate, and the connecting rod 2 drives the bone harvester body 1 to rotate. Rotary cutting can effectively cut into the bone and obtain a complete columnar bone block, while preventing damage to other parts of the bone donor site.

[0032] Furthermore, the positioning device 3 includes a positioning sleeve 32 and a positioning rod 33. The positioning sleeve 32 is disposed on the outer wall of the bone harvester body 1, and the positioning rod 33 is disposed at the central axis of the connecting rod 2 and the bone harvester body 1. The two can cooperate with each other for joint use, or exist independently for auxiliary positioning. The positioning device 3 can guide and cooperate with the bone harvester body 1 or the connecting rod 2, and can be displaced axially relative to the bone harvester body 1 or the connecting rod 2. When the bone harvester body 1 and the positioning device 3 are relatively displaced and gradually penetrate into the bone, the positioning device 3 always remains in the initial position and contacts the bone tissue, thereby playing a guiding and limiting role. The lower end of the positioning device 3 is constructed as a positioning part 31 for positioning with bone or cartilage tissue. This positioning part 31 facilitates the contact between the positioning device 3 and the bone surface, thereby achieving stable positioning and preventing the bone harvester from deviating during the cutting process.

[0033] In practice, the doctor fixes the positioning device 3 at the position to be treated, so that the open end of the bone harvester body 1 is in close contact with the bone surface. Then, the driving device is activated to make the bone harvester body 1 start to rotate. The serrations 12 at the open end begin to rotate and cut on the bone surface. As the cutting goes deeper, a relative force is generated between the positioning device 3 and the bone. The bone pushes the positioning device 3 to move upward gradually. When the predetermined depth is reached, the driving device is turned off to stop the rotation of the bone harvester body 1. The bone harvester body 1 is then pulled out. The columnar bone tissue cut out in the bone harvester body 1 is the required osteocartilage graft.

[0034] refer to Figure 1 and Figure 3 In one embodiment of this disclosure, the positioning device 3 includes a positioning sleeve 32, which has an inner cavity for guiding and engaging with the outer wall of the bone harvester body 1; the bone harvester body 1 passes through the inner cavity of the positioning sleeve 32 and engages with the osteochondral bone; the outer wall of the positioning device 3 is used for handheld operation, and the positioning part 31 is the bottom edge of the positioning sleeve 32.

[0035] Specifically, the positioning device 3 in the bone harvester of this disclosure includes a positioning sleeve 32. The positioning sleeve 32 has an inner cavity whose dimensions match the outer wall of the bone harvester body 1, allowing the bone harvester body 1 to pass axially through the inner cavity and form a guiding engagement with the positioning sleeve 32. This guiding structure enables the bone harvester body 1 to maintain a stable direction of movement under the guidance of the positioning sleeve 32 during operation, preventing deviation or shaking when cutting into bone tissue, thereby improving the precision of the surgery.

[0036] Furthermore, the bottom edge of the positioning sleeve 32 is a positioning part 31, which is used to contact bone or cartilage tissue and achieve positioning function. In actual operation, the doctor can first press the positioning sleeve 32 on the surface of the target bone tissue with his hand, and use its bottom edge to preliminarily mark and fix the bone harvesting area to ensure the accuracy of the subsequent cutting path of the bone harvester.

[0037] In addition, the outer wall of the positioning sleeve 32 is designed to be easy for doctors to hold, serving as a handheld part. By holding the positioning sleeve 32, doctors can achieve more precise control during bone harvesting, first fixing the position and then guiding the bone harvester body 1 to cut into the bone or cartilage tissue, thereby improving the safety of bone harvesting.

[0038] refer to Figure 3 In one embodiment of this disclosure, the upper end of the outer wall of the positioning bushing 32 is provided with a radially outwardly extending bent portion 321.

[0039] Specifically, the bent portion 321 extends radially outward from the upper end of the outer wall of the positioning sleeve 32, forming a structure similar to an annular flange. Its main function is to provide the doctor with a gripping fulcrum that facilitates force application and control during operation. When the doctor holds the positioning sleeve 32 for positioning, they can rest their fingers against the bent portion 321 to more stably control the position of the positioning sleeve 32 and prevent positioning deviation caused by slippage or uneven force during operation.

[0040] refer to Figure 1 and Figure 4In one embodiment of this disclosure, the positioning device 3 includes a positioning rod 33, the connecting rod 2 is configured to have a guide channel 21 extending through to the receiving cavity 11; the positioning rod 33 is configured to pass through the guide channel 21 and through the receiving cavity 11; the positioning part 31 is the bottom of the positioning rod 33.

[0041] Specifically, the positioning device 3 disclosed herein may include both the positioning sleeve 32 and the positioning rod 33, or it may consist of only one of the two. For example, when the positioning device 3 consists only of the positioning sleeve 32, the doctor can first contact the positioning sleeve 32 with the bone tissue and fix it in an initial position before the bone harvesting operation begins. In subsequent operations, as the bone harvesting device body 1 undergoes axial displacement relative to the positioning sleeve 32 and gradually penetrates into the bone tissue, the positioning device 3 remains in the initial position and continues to contact the bone tissue, playing a guiding and limiting role.

[0042] When the positioning device 3 only includes the positioning rod 33, the doctor can also contact the bottom positioning part 31 of the positioning rod 33 with the bone tissue before the operation and fix it in the initial position; during the bone harvesting process, as the bone harvester body 1 and the positioning rod 33 are relatively displaced and gradually enter the bone tissue, the positioning device 3 remains in the original position and keeps in contact with the bone tissue, thereby achieving stable positioning guidance.

[0043] When the positioning device 3 includes both the positioning sleeve 32 and the positioning rod 33, the doctor can make both of them come into contact with the bone tissue before the operation and fix them in the same initial position. During the process of relative displacement between the bone harvester body 1 and the positioning sleeve 32 and the positioning rod 33 and gradually penetrating into the bone tissue, the entire positioning device 3 still maintains the initial positioning state and continues to be in contact with the bone tissue, so as to achieve a more accurate and stable positioning effect.

[0044] Furthermore, the positioning rod 33 of this disclosure is configured to extend through the guide channel 21 inside the connecting rod 2 and through the receiving cavity 11 of the bone harvester body 1. At this time, the positioning part 31 is the bottom of the positioning rod 33, and the bottom of the positioning rod 33 contacts the bone or cartilage tissue. The positioning rod 33 can play a preliminary fixing and guiding role, ensuring that the bone harvester moves along the predetermined path during subsequent rotational cutting, avoiding deviation or slippage, thereby improving the accuracy and safety of bone harvesting.

[0045] refer to Figure 1 In one embodiment of this disclosure, the bottom of the positioning rod 33 is a pointed structure.

[0046] Specifically, in practice, the doctor first aligns the tip of the positioning rod 33 with the target bone region, thereby marking the predetermined insertion position of the bone harvester on the bone tissue. The tip of the positioning rod 33 effectively prevents it from slipping or shifting during the operation, improving the accuracy and stability of the positioning.

[0047] refer to Figure 1 and Figure 2 In one embodiment of this disclosure, a notch 13 is provided on the side wall of the bone harvester body 1, extending into the receiving cavity 11.

[0048] Specifically, the notch 13 provides a visual observation channel for the doctor, allowing them to directly observe the condition of the bone tissue within the receiving cavity 11 of the bone harvester body 1 and the cutting depth. This enables more accurate control of the operation, providing the doctor with more intuitive and realistic feedback information, avoiding problems such as excessive cutting, bone fragment breakage, or incomplete bone retrieval due to misjudgment, thereby improving the success rate of bone retrieval. Furthermore, after the bone retrieval operation is completed, a cylindrical bone fragment will form within the receiving cavity 11 of the bone harvester body 1. Due to the compression of this bone fragment during the cutting process, it will generate friction with the inner wall of the receiving cavity 11, making it difficult to push out or slide out directly. At this time, the doctor can use tweezers or other instruments inserted into the notch 13 on the side wall to directly act on the side or end of the bone fragment, using the notch 13 as an operating channel to more easily push the bone fragment out of the receiving cavity 11.

[0049] refer to Figure 1 and Figure 2 In one embodiment of this disclosure, two notches 13 are provided, and the two notches 13 are distributed on opposite sides of the bone harvester body 1.

[0050] Specifically, this disclosure provides surgeons with a more comprehensive and multi-angled field of view during surgery by providing two notches 13 on opposite sides of the bone harvester body 1. This facilitates real-time observation of bone tissue entering the receiving cavity 11, thereby improving the controllability and safety of the operation. Furthermore, this symmetrical structure helps improve the uniformity of force distribution on the bone harvester during rotation, avoiding uneven force distribution or unstable cutting caused by unilateral openings. Simultaneously, the two notches 13 also facilitate postoperative cleaning or removal of bone fragments.

[0051] refer to Figure 1 In one embodiment of this disclosure, a scale is provided on the side wall of the bone harvester body 1, and the scale is configured to count upwards from the bottom of the bone harvester body 1.

[0052] Specifically, the scale on the side wall is mainly used to visually reflect the depth to which the bone harvester enters the bone tissue. During the operation, the doctor can observe the scale values ​​to accurately judge the current cutting or drilling depth, thereby achieving precise control over the bone harvesting process. Because the scale is arranged from bottom to top, the doctor can more intuitively grasp the progress of instrument insertion during operation, avoiding situations where the cut is too deep or too insufficient due to misjudgment of depth.

[0053] Furthermore, this bottom-up scale arrangement meets the actual needs of doctors in clinical practice, especially in osteochondral transplantation surgery, where the bone harvesting site is often located at a certain depth below the bone surface. Counting from the bottom helps to more accurately correspond to the actual length of bone tissue entering the bone and reduce reading errors.

[0054] refer to Figure 1 In both embodiments of this disclosure, a nut 4 is provided on the top of the bone harvester body 1, and the connecting rod 2 is configured to be threadedly connected to the nut 4.

[0055] Specifically, through a threaded connection, the connecting rod 2 can be firmly fixed to the bone harvester body 1, ensuring that it will not loosen or fall off even under high-speed rotation or large torque during the operation, thus guaranteeing the stability and safety of the surgical procedure. At the same time, this threaded connection method also has good disassembly capability, allowing doctors to quickly replace different sizes of the bone harvester body 1 or the connecting rod 2 as needed, thereby improving operational efficiency.

[0056] refer to Figure 1 In one embodiment of this disclosure, the end of the connecting rod 2 away from the bone harvester body 1 is configured to be flat for bonding with the drive device.

[0057] Specifically, the flattened end is typically a regular polyhedral structure, allowing for a tight fit with the output shaft of the drive device. The keyed connection enables the transmission of significant torque, preventing slippage or relative rotation during high-speed operation, thus ensuring the stability and operational precision of the bone harvester body 1 during the cutting process. Furthermore, this detachable keyed connection method facilitates quick replacement of different sizes of the bone harvester body 1 as needed for surgery, improving flexibility and efficiency.

[0058] This disclosure provides a bone harvesting device for osteochondral grafting. By incorporating a positioning device, the device body can be accurately placed in a predetermined position, resulting in more precise cutting. Furthermore, the positioning device can be axially displaced, allowing for precise control of the depth the harvesting device penetrates into the bone, avoiding problems of excessive or insufficient bone harvesting. The positioning device can include both a positioning sleeve and a positioning rod, or only one of them. Ultimately, whether using the positioning sleeve or the positioning rod alone, or combining both, aims to achieve better surgical outcomes. The choice of method depends primarily on the specific surgical needs, individual patient differences, and the surgeon's operating habits. This flexibility allows the bone harvesting device to better adapt to diverse clinical applications, improving the overall quality and efficiency of the surgery.

[0059] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of this disclosure is defined by the appended claims.

Claims

1. A bone harvesting device for osteochondral transplantation, characterized in that, include: The bone harvester body (1) is configured to have a receiving cavity (11), which is configured to form an open end at the lower end of the bone harvester body (1); a ring of serrations (12) is provided at the edge of the open end of the bone harvester body (1). A connecting rod (2), one end of which is configured to connect to the bone harvester body (1), and the other end of which is configured to connect to a drive device; The positioning device (3) is configured to guide and cooperate with the bone harvester body (1) or the connecting rod (2) and is configured to be axially displaced relative to the bone harvester body (1) or the connecting rod (2). The lower end of the positioning device (3) is configured as a positioning part (31) for positioning with osteocartilage.

2. The bone harvesting device according to claim 1, characterized in that, The positioning device (3) includes a positioning sleeve (32) having an inner cavity for guiding and engaging with the outer wall of the bone harvester body (1); the bone harvester body (1) passes through the inner cavity of the positioning sleeve (32) and engages with the osteochondral bone; the outer wall of the positioning device (3) is configured for handheld use, and the positioning part (31) is the bottom edge of the positioning sleeve (32).

3. The bone harvesting device according to claim 2, characterized in that, The upper end of the outer wall of the positioning bushing (32) is provided with a radially outwardly extending bent portion (321).

4. The bone harvesting device according to any one of claims 1 to 3, characterized in that, The positioning device (3) includes a positioning rod (33), the connecting rod (2) is configured to have a guide channel (21) extending through the receiving cavity (11); the positioning rod (33) is configured to pass through the guide channel (21) and through the receiving cavity (11); the positioning part (31) is the bottom of the positioning rod (33).

5. The bone harvesting device according to claim 4, characterized in that, The bottom of the positioning rod (33) is constructed as a pointed structure.

6. The bone harvesting device according to claim 1, characterized in that, The bone harvester body (1) has a notch (13) on its side wall that extends into the receiving cavity (11).

7. The bone harvesting device according to claim 6, characterized in that, There are two notches (13), which are distributed on opposite sides of the bone harvester body (1).

8. The bone harvesting device according to claim 1, characterized in that, A scale is provided on the side wall of the bone harvester body (1), and the scale is configured to count upwards from the bottom of the bone harvester body (1).

9. The bone harvesting device according to claim 1, characterized in that, The top of the bone harvester body (1) is provided with a nut (4), and the connecting rod (2) is configured to be threadedly connected to the nut (4).

10. The bone harvesting device according to claim 1, characterized in that, The end of the connecting rod (2) away from the bone harvester body (1) is constructed to be flat for bonding with the drive device.

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