Flat drill for osteochondral transplantation
By setting a cutting edge on the sidewall of the drill bit body and a positioning rod on the drill shank, the problems of tipped drill bit slippage and stress concentration are solved, achieving efficient, accurate and stable drilling of bones and ensuring the integrity of the bone structure.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 山西医科大学第二医院(山西医科大学第二临床医学院)
- Filing Date
- 2025-08-04
- Publication Date
- 2026-07-24
AI Technical Summary
Existing pointed drill bits are prone to slipping or shifting during drilling, resulting in inaccurate drilling positions. Furthermore, the small contact area at the center point leads to stress concentration, affecting the integrity and stability of the bone structure.
Design a flat-bottomed drill with at least two cutting edges on the sidewall of the drill bit body, the bottom of the cutting edges being located in the same plane, the drill shank being coaxially connected to the drill bit, and a positioning rod in a guide channel being provided on the drill bit body and the drill shank to improve positioning accuracy and avoid deviation.
It achieves high efficiency and accuracy in drilling, avoids the generation of microcracks on the bone surface, ensures the integrity and stability of the bone structure, and reduces the risk of accidental injury during the drilling process.
Smart Images
Figure CN224540262U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of osteochondral allogeneic transplantation technology, and specifically to a flat-bottomed drill for osteochondral transplantation. Background Technology
[0002] Bone drilling is a common procedure in clinical settings such as osteochondral allogeneic transplantation. Currently, pointed medical drills used for bone drilling are easy to position and provide good guidance, helping the drill accurately enter the intended location. However, this traditional design has some significant drawbacks in practical applications.
[0003] First, pointed drill bits are prone to slippage or deviation at the beginning of drilling, especially on smooth or highly curved bone surfaces. This can lead to inaccurate drilling positions and increase the risk of accidentally injuring surrounding nerves, blood vessels, or other vital tissues. Second, because the center contact area of a pointed drill bit is small, it causes localized stress concentration, which can easily cause microcracks on the bone surface in the early stages of drilling, thus affecting the integrity and stability of the bone structure. 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 flat-bottomed drill for osteochondral grafting, comprising: A drill bit body, wherein at least two cutting edges are provided on the sidewall of the drill bit body, the cutting edges are configured to extend obliquely from the sidewall of the drill bit body to the end of the drill bit body; and the two opposite sides of the cutting edges are configured to extend in a straight line; and the bottoms of all the cutting edges are configured to be located in the same plane. A drill shank, which is coaxially arranged with the drill bit body and is configured to be fixedly connected to the drill bit body.
[0005] In one embodiment of this disclosure, the cutting edge is configured to have an angle of 10° to 20° with the central axis of the drill body.
[0006] In one embodiment of this disclosure, the cutting edge is configured to have an angle of 15° with the central axis of the drill body.
[0007] In one embodiment of this disclosure, four cutting edges are provided, and the four cutting edges are configured to be distributed in the circumferential direction of the drill body.
[0008] In one embodiment of this disclosure, the four cutting edges are configured to form a flat-bottomed cross structure at the bottom of the drill body.
[0009] In one embodiment of this disclosure, the side of the bottom of the cutting edge facing away from its tilt direction is configured as the bottom edge of the cutting edge formed by cutting.
[0010] In one embodiment of this disclosure, the width of the cutting edge is configured to gradually increase from top to bottom.
[0011] In one embodiment of this disclosure, the thickness of the cutting edge is configured to gradually decrease from top to bottom.
[0012] In one embodiment of this disclosure, the sidewall of the drill body is configured to be cut to form the cutting edge.
[0013] In one embodiment of this disclosure, a through-channel is provided on the drill bit body and the drill shank, and a through-positioning rod is provided in the through-channel, the positioning rod being configured to have a pointed tip structure.
[0014] This disclosure provides a flat-bottomed drill for osteochondral grafting. By providing at least two cutting edges on the sidewall of the drill body, with the bottoms of all cutting edges located in the same plane, this ensures both high-efficiency cutting and uniform stress distribution on the bone surface during drilling. This effectively prevents microcracks on the bone surface caused by stress concentration during drilling, thus preserving the integrity of the bone structure. A drill shank is located at the end of the drill head furthest from the bottom of the cutting edges, and is coaxially and fixedly connected to the drill body. The other end of the drill shank connects to a drive device, transmitting the driving force output by the drive device to the drill body, driving the drill body to perform the cutting action. Furthermore, a positioning rod with a pointed structure is provided in the guide channel on the drill body and drill shank. When drilling is required, the doctor can first use the positioning rod to determine the predetermined drilling position. The pointed structure helps improve the accuracy of positioning, preventing drilling position deviation and improving the accuracy of the entire operation.
[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 front view of a flat-bottomed drill for osteochondral transplantation provided in an embodiment of this disclosure; Figure 2 This is a bottom view of a flat-bottomed drill for osteochondral transplantation provided in an embodiment of this disclosure; Figure 3This is a schematic diagram of a flat-bottomed drill for osteochondral transplantation provided in one embodiment of the present disclosure; Figure 4 This is an embodiment provided by the present disclosure. Figure 3 A magnified view of a portion of point A in the middle.
[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. Drill bit body; 2. Cutting edge; 3. Drill shank; 4. Central axis; 5. Bottom cutting edge; 6. Guide channel; 7. Positioning rod; 8. 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 flat-bottomed drill for osteochondral transplantation, comprising a drill body and a drill shank. At least two cutting edges are provided on the sidewall of the drill body, extending obliquely from the sidewall to the end of the drill body. Each cutting edge has a cutting edge at its base, and opposite sides of the cutting edges are configured to extend in a straight line. The bases of all cutting edges are located in the same plane, meaning there are no protruding tips at the base of the cutting edges. Therefore, when drilling into bone, this ensures both high cutting efficiency and uniform stress distribution on the bone surface, effectively preventing microcracks on the bone surface caused by stress concentration during drilling, thus ensuring the integrity of the bone structure. A drill shank is provided at the end of the drill head furthest from the base of the cutting edges, and is coaxially and fixedly connected to the drill body. The other end of the drill shank is connected to a drive device, transmitting the driving force output by the drive device to the drill body to drive the drill body in a cutting motion. Furthermore, by setting a positioning rod with a pointed structure in the guide channel on the drill bit body and drill shank, when drilling is required, the doctor can first use the positioning rod to determine the predetermined drilling position. The pointed structure helps to improve the positioning accuracy, avoid the drilling position from deviating, and improve the accuracy of the entire operation process.
[0027] This disclosure discloses a flat-bottomed drill for osteochondral transplantation. By providing at least two cutting edges on the sidewall of the drill body, and ensuring that the bottom of all cutting edges is located in the same plane, the drill body can uniformly distribute force on the bone surface when drilling, thus avoiding the formation of microcracks on the bone surface due to stress concentration and ensuring the integrity of the bone structure.
[0028] For ease of understanding, please refer to the following: Figures 1 to 4 The following describes in detail the specific structure and working principle of a flat-bottomed drill for osteochondral transplantation disclosed herein, with reference to an embodiment.
[0029] refer to Figure 1 and Figure 4 This disclosure provides a flat-bottomed drill for osteochondral transplantation, comprising a drill body 1 and a drill shank 3. The drill body 1 has at least two cutting edges 2 on its sidewall. The cutting edges 2 extend obliquely from the sidewall of the drill body 1 to the end of the drill body 1, and the two opposite sides of the cutting edges 2 are configured to extend in a straight line. The bottoms of all the cutting edges 2 are located in the same plane. The drill shank 3 is coaxially disposed with the drill body 1 and is configured to be fixedly connected to the drill body 1.
[0030] Specifically, the flat-bottomed drill for osteocartilage transplantation disclosed herein includes a drill body 1 and a drill shank 3. The drill shank 3 is fixedly connected to the end of the drill body 1 away from the cutting end by a nut 8. The drill shank 3 is connected to a drive device to transmit the driving force output by the drive device to the drill body 1. The drill body 1 is used to contact the bone surface and rotate and cut the bone under the action of the drive device, ultimately leaving a hole of a predetermined depth on the bone surface.
[0031] The drill bit body 1 has at least two cutting edges 2 that extend obliquely along the sidewall to the end of the drill bit body 1. The opposite sides of each cutting edge 2 are configured to extend in a straight line, and all cutting edges 2 extend to the end of the drill bit body 1 and are located in the same plane. This ensures that all cutting edges 2 can simultaneously contact the bone during cutting, preventing slippage due to the protrusion of individual cutting edges 2 on the bone contact surface, thus improving the stability of the contact between the cutting edges 2 and the bone. Furthermore, a space is formed between adjacent cutting edges 2 to accommodate bone fragments. During drilling, the bone fragments cut by the drill bit body 1 are discharged outward through this space, preventing the accumulation of bone fragments from obstructing the drilling and ensuring the smoothness of the entire cutting process.
[0032] Furthermore, a drill shank 3 is coaxially arranged above the drill bit body 1, and the drill shank 3 is fixedly connected to the drill bit body 1 by a nut 8. The other end of the drill shank 3 is connected to the drive device, which can transmit the driving force output by the drive device to the drill bit body 1.
[0033] In actual operation, the drill body 1 first contacts the surface of the bone to be cut. When the drill body 1 starts to rotate and begins to cut, the multiple cutting edges 2 distributed on the drill body 1 simultaneously cut into the bone tissue. The cutting edges 2 extend at a predetermined angle along the rotation direction of the drill body 1, forming a continuous spiral cutting trajectory during the rotation process.
[0034] Compared to the traditional vertical blade setup, the angled cutting edge 2 disperses the radial resistance when cutting into the bone, reducing energy loss during the cutting process. Simultaneously, the helical cutting trajectory guides bone debris out in an orderly manner, preventing debris accumulation and secondary friction, further improving cutting efficiency. The angled cutting edge 2 makes the entire cutting process smoother, allowing for rapid bone cutting and ultimately achieving efficient, stable, and safe cutting results.
[0035] refer to Figure 1 The cutting edge 2 is configured such that the angle between it and the central axis 4 of the drill body 1 is 10° to 20°.
[0036] Specifically, the tilt angle between the cutting edge 2 and the central axis 4 of the drill body 1 can be set between 10° and 20°. The size of the tilt angle directly determines the final diameter of the drill hole. When the tilt angle of the cutting edge 2 is larger, the lateral cutting force acting on the bone surface during rotation increases accordingly, thus naturally forming a larger diameter drill hole during drilling. Conversely, when the tilt angle is smaller, the lateral cutting effect weakens, and the diameter of the drill hole decreases accordingly. Therefore, by reasonably setting the tilt angle between the cutting edge 2 and the central axis 4, the drill hole diameter can be controlled to meet the specific requirements of different surgical scenarios for the diameter of the pores in bone tissue.
[0037] Furthermore, setting the tilt angle between 10° and 20° ensures both effective cutting capability and sufficient strength for the drill body 1. If the tilt angle of the cutting edge 2 is too large, it will become overly sharp. While this increases the ease of material penetration, it also makes the cutting edge 2 more susceptible to impact damage, shortening the drill's lifespan. If the tilt angle of the cutting edge 2 is too small, greater force is required to penetrate the material during drilling, increasing energy consumption and potentially causing thermal damage to the drill's surface. Therefore, an appropriate tilt angle for the cutting edge 2 ensures that the drill body 1 is neither too sharp, leading to rapid wear, nor too dull, affecting cutting efficiency during operation.
[0038] refer to Figure 1 In one embodiment of this disclosure, the cutting edge 2 is configured such that the angle between it and the central axis 4 of the drill body 1 is 15°.
[0039] Specifically, the angle between the cutting edge 2 and the central axis 4 of the drill body 1 can be set between 10° and 20°. In this disclosure, the angle between the cutting edge 2 and the central axis 4 of the drill body 1 is set to 15°, which can ensure both effective cutting capability and sufficient strength of the drill body 1.
[0040] refer to Figure 2 and Figure 3 In one specific embodiment of this disclosure, four cutting edges 2 are provided, and the four cutting edges 2 are configured to be distributed in the circumferential direction of the drill body 1.
[0041] Specifically, four cutting edges 2 are evenly distributed on the sidewalls of the drill body 1 and arranged circumferentially around the drill body 1. This makes the force generated during drilling more balanced, reducing the problem of drill body 1 shifting or vibrating due to excessive local stress, and improving the stability of the drilling process. Furthermore, the four circumferentially distributed cutting edges 2 ensure that each rotation can make multiple cuts on the designated part of the bone. Compared to a single cutting edge 2, four circumferentially distributed cutting edges 2 can remove bone tissue from the designated location more quickly, thereby increasing drilling speed and improving work efficiency.
[0042] refer to Figure 2 and Figure 3 In one embodiment of this disclosure, the four cutting edges 2 are configured to form a flat-bottomed cross structure at the bottom of the drill body 1.
[0043] Specifically, the four cutting edges 2 extend obliquely from the sidewall of the drill body 1 to the end of the drill body 1, forming a flat-bottomed cross structure at the bottom of the drill body 1. In the initial stage of cutting the bone, the flat-bottomed structure can provide a larger contact support area, and with the symmetrical distribution of the cross shape, the cutting force can be evenly distributed in four directions, effectively avoiding the risk of slippage or deviation caused by the protruding structure at the bottom.
[0044] Furthermore, compared to traditional single-blade designs, the flat-bottomed structure with four cutting edges forming a cross allows for simultaneous cutting of bone tissue from four directions, increasing the cutting volume per unit time by more than four times. This multi-directional collaborative cutting mode not only accelerates the initial entry speed but also reduces drill vibration through symmetrical force distribution, preventing irregular fragmentation of bone tissue, thereby significantly improving drilling efficiency, significantly shortening drilling operation time during surgery, and reducing intraoperative risks for patients.
[0045] refer to Figure 3 and Figure 4 In one embodiment of this disclosure, the side of the bottom of the cutting edge 2 facing away from its inclined direction is configured as the bottom edge 5 formed by cutting the cutting edge 2.
[0046] Specifically, the cutting edge 2 of this disclosure has a bottom cutting edge 5 formed on its bottom side opposite to its inclined direction, such as... Figure 3 and Figure 4 As shown, the bottom cutting edge 5 has multiple cutting edges formed through multiple cuts. The multiple cutting edges mean that the bottom cutting edge 5 no longer has a single point of force when it comes into contact with the bone. Instead, multiple contact points work together, thereby dispersing the cutting force, reducing the concentration of local stress, and thus improving the stability and anti-deviation ability of the drilling process.
[0047] refer to Figure 1 In one embodiment of this disclosure, the width of the cutting edge 2 is configured to gradually increase from top to bottom.
[0048] Specifically, as the radial width of the cutting edge 2 increases from top to bottom, the structure of the cutting edge 2 near the bottom of the drill bit becomes more stable. This helps to improve the rigidity and stability of the drill bit body 1, reducing vibration and sway during drilling. Furthermore, the wider bottom of the cutting edge 2 allows for a larger space between adjacent cutting edges 2 to accommodate and remove cutting debris, effectively preventing clogging and thus improving drilling quality.
[0049] refer to Figure 1 In one embodiment of this disclosure, the thickness of the cutting edge 2 is configured to gradually decrease from top to bottom.
[0050] Specifically, setting the thickness of the cutting edge 2 near the bottom to be thinner than that near the bottom can reduce the resistance when the drill body 1 enters the material, making it easier for the drill body 1 to cut into the bone. The thinner cutting edge at the bottom can reduce damage to the bone surface, thus forming a smoother drill hole on the bone surface. The thickness of the cutting edge 2 away from the bottom is thicker than that near the bottom, which can enhance the structural strength of the drill body 1, thereby improving the stability of the drilling process.
[0051] refer to Figure 1 and Figure 2 In one embodiment of this disclosure, the sidewall of the drill body 1 is configured to form a cutting edge 2 by cutting.
[0052] Specifically, the sidewall of the drill bit body 1 is machined to form a cutting edge 2 with an inclined angle, which is used to enhance its cutting performance and chip removal efficiency during the drilling process. The cutting edge 2 is provided with a cutting edge at the bottom, thereby improving the drill bit body 1's ability to cut into the material and the drilling efficiency. The space formed between two adjacent cutting edges 2 can discharge the chips obtained from cutting in time, preventing the chips from accumulating and affecting the drilling effect.
[0053] refer to Figure 2 In one embodiment of this disclosure, a through-channel 6 is provided on the drill bit body 1 and the drill shank 3, and a through-positioning rod 7 is provided in the through-channel 6. The positioning rod 7 is configured to have a pointed tip structure.
[0054] Specifically, this disclosure provides a positioning rod 7 within the guide channel 6 of the drill bit body 1 and the drill shank 3. The positioning rod 7 is constructed with a pointed structure, and when drilling into the bone, the pointed structure of the positioning rod 7 contacts the bone, thereby marking the predetermined drilling position of the drill bit body 1 on the bone. This ensures that the drill bit body 1 moves along the predetermined path during subsequent rotary cutting, avoiding deviation or slippage, thereby improving the accuracy and safety of the drilling position.
[0055] Furthermore, the positioning rod 7 can move axially within the guide channel 6. In actual operation, the doctor first positions the tip of the positioning rod 7 at the position to be cut on the bone surface, and then turns on the drive device to make the drill body 1 start to rotate and cut the bone surface. When relative movement occurs between the drill body 1 and the positioning rod 7 and the drill body 1 gradually penetrates into the bone surface, the tip of the positioning rod 7 is always positioned at the position to be cut on the bone surface to ensure that the drill body 1 can proceed along the predetermined path during the subsequent rotational cutting process and ensure the stability of the drilling process.
[0056] This disclosure provides a flat-bottomed drill for osteochondral transplantation. By providing at least two cutting edges on the sidewall of the drill body, with the bottoms of all cutting edges located in the same plane, local stress is dispersed when the drill body drills a hole on the bone surface, preventing the generation of microcracks on the bone surface and thus ensuring the integrity and stability of the bone structure. Furthermore, by providing a positioning rod with a pointed structure in the guide channel on the drill body and the drill shank, drilling positioning is assisted, preventing drilling position deviation.
[0057] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not 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 flat-bottomed drill for osteochondral transplantation, characterized in that, include: The drill bit body (1) has at least two cutting edges (2) on its sidewall. The cutting edges (2) are configured to extend obliquely from the sidewall of the drill bit body (1) to the end of the drill bit body (1). The two opposite sides of the cutting edges (2) are configured to extend in a straight line. The bottoms of all the cutting edges (2) are configured to be located in the same plane. The drill shank (3) is coaxially arranged with the drill bit body (1) and is configured to be fixedly connected to the drill bit body (1).
2. The flat-bottom drill according to claim 1, characterized in that, The cutting edge (2) is configured such that the angle between it and the central axis (4) of the drill body (1) is 10° to 20°.
3. The flat-bottom drill according to claim 2, characterized in that, The cutting edge (2) is configured to have an angle of 15° with the central axis (4) of the drill body (1).
4. The flat-bottom drill according to claim 1, characterized in that, The cutting edge (2) is provided in four parts, and the four cutting edges (2) are configured to be distributed in the circumferential direction of the drill body (1).
5. The flat-bottom drill according to claim 4, characterized in that, The four cutting edges (2) are configured to form a flat-bottomed cross structure at the bottom of the drill body (1).
6. The flat-bottom drill according to claim 1, characterized in that, The side of the bottom of the cutting edge (2) facing away from its inclined direction is constructed as the bottom edge (5) of the cutting edge (2) formed by cutting.
7. The flat-bottom drill according to claim 1, characterized in that, The width of the cutting edge (2) is configured to gradually increase from top to bottom.
8. The flat-bottom drill according to claim 1, characterized in that, The thickness of the cutting edge (2) is configured to gradually decrease from top to bottom.
9. The flat-bottom drill according to claim 1, characterized in that, The sidewall of the drill body (1) is configured to be cut to form the cutting edge (2).
10. The flat-bottom drill according to claim 1, characterized in that, A through channel (6) is provided on the drill bit body (1) and the drill shank (3), and a through positioning rod (7) is provided in the through channel (6). The positioning rod (7) is constructed to have a pointed tip structure.