Cylindrical bone drill

Abstract

The utility model discloses a cylindrical bone drill relates to the field of medical devices, and the cylindrical bone drill includes: drill body and the coaxial setting connecting handle with it, wherein, the drill body is the cylindrical structure of diameter 2.2 5.8mm, in the drill body including the spiral cutting head of integral processing formation, the spiral cutting head is by 4 10 spiral distribution cutting blade of the axial distribution of drill body constructs, and the front blade of every cutting blade is 58 62 with drill body axis angle of clamping, and the depth value of cutting blade is 0.5 1.45mm, and the outer periphery of drill body is equipped with the marking unit that the annular concave point circle group of the axial interval of 1 3mm is composed, the cylindrical bone drill of the utility model has cutting stable, bone mud delicate, mark clear and the like advantage, is applicable to the precision oral surgery such as planting, periodontal in autogenous bone collection and bone mud preparation, improves the operation efficiency and accuracy.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a cylindrical bone harvesting drill used in oral implant and plastic surgery. Background Technology

[0002] Currently, in fields such as dental implantology and periodontal surgery, it is often necessary to process and utilize bone tissue from the alveolar bone region of patients. This includes preparing implant sockets and harvesting autologous bone for filling, widening, or covering procedures. Traditional tools for harvesting autologous bone tissue mainly include bone saws, bone chisels, bone forceps, and bone scrapers. However, these tools are mostly manually operated, have low precision, and limited operating space, making it difficult to reach deep or narrow implant sockets for effective bone harvesting. In addition, existing autologous bone harvesting tools mainly harvest whole pieces of bone, making it difficult to process bone tissue into usable bone paste or fine bone granules. Currently, there are no tools for crushing autologous bone blocks, resulting in autologous "bone blocks" of varying shapes that cannot be standardized or used flexibly.

[0003] Especially in periodontal regeneration and bone augmentation surgeries, the surgical area often requires bone powder or bone paste to cover exposed tooth roots or bare implants to promote periodontal tissue regeneration and enhance implant stability. In these cases, directly covering the area with the patient's own bone paste can significantly improve postoperative healing and biocompatibility. However, traditional instruments such as bone forceps cannot effectively break down bone into paste within the cavity, limiting the efficient use of bone resources. Alternative bone powder is artificial bovine bone, which costs 1200 yuan per gram, making it very expensive. Artificial bovine bone lacks active osteoblasts, resulting in slow bone replacement and weak bone strength.

[0004] In view of this, providing a medical device that is compact in structure, can extend into the interior of a cavity, has the function of crushing bone into mud, and has depth indication has become an urgent technical problem to be solved. Utility Model Content

[0005] One technical problem to be solved by this utility model embodiment is how to develop a cylindrical bone-harvesting drill with a compact structure, capable of extending into the interior of a cavity, having the function of crushing bone into mud, and having a depth indicator, so as to solve the problems existing in the prior art.

[0006] In a first aspect, this application provides a cylindrical bone-harvesting drill, comprising: a drill body 1 and a connecting shank 2 coaxially arranged therewith, wherein the drill body 1 is a cylindrical structure with a diameter of 2.2-5.8 mm; the drill body 1 includes an integrally machined helical cutter head, the helical cutter head being composed of 4-10 cutting blades 3 arranged helically along the axial direction of the drill body 1; the angle between the front cutting edge of each cutting blade 3 and the axis of the drill body 1 is 58°-62°, and the depth of the cutting blade 3 is 0.5-1.45 mm; the ratio of the depth of the cutting blades 3 of the helical cutter head to the diameter of the drill body 1 is between 1 / 5 and 1 / 4; the helix angle of the helical cutter head is 15°-25°, used to crush bone and convey it upward into bone paste during the cutting process.

[0007] In conjunction with the first aspect, in an optional embodiment, the following is included: a marking unit 4 for indicating the drilling depth is provided on the outer periphery of the drill body 1, the marking unit 4 being composed of a plurality of circumferential concave circles evenly spaced 1mm-3mm along the axial direction, for marking the distance to the center of the ball head of the drill body 1.

[0008] In conjunction with the first aspect, in an optional implementation, the marking unit 4 has a pit depth of 0.1-0.6 mm to ensure clear visibility even in bloodless or bleeding environments.

[0009] In conjunction with the first aspect, in an optional implementation, the following is included: the length of the cylindrical bone-harvesting drill is H1, wherein 25.00mm≤H1≤45.00mm; the length of the connecting handle 2 is H2, and the diameter is D2, wherein 15.00mm≤H2≤25.00mm, and 2.00mm≤D2≤2.50mm.

[0010] In conjunction with the first aspect, in an optional implementation, the cylindrical bone-harvesting drill has a length H1 of 41 mm, the connecting handle 2 has a length H2 of 20 mm, and the marking unit 4 is provided with 10 concave dots to mark the drilling depth scale of the cylindrical bone-harvesting drill from 0 to 21 mm.

[0011] In conjunction with the first aspect, in an optional implementation, the cylindrical bone-harvesting drill has a length H1 of 33 mm, the connecting handle 2 has a length H2 of 16 mm, and the marking unit 4 is provided with 8 concentric circles for marking the drilling depth scale of the cylindrical bone-harvesting drill from 0 to 17 mm.

[0012] In conjunction with the first aspect, in an optional implementation, the drill body 1 is a cylindrical structure with a diameter of 3.3 mm.

[0013] In conjunction with the first aspect, in an optional implementation, the cutting edge of each cutting blade 3 forms an angle of 60° with the axis of the drill body 1.

[0014] In conjunction with the first aspect, in an optional implementation, the spiral cutter head has four, six, eight, or ten cutting blades.

[0015] In conjunction with the first aspect, in an optional implementation, the depth of the cutting blade 3 is 0.7 mm.

[0016] In conjunction with the first aspect, in an optional implementation, the following is included: the spiral cutter head of the drill body 1 is machined as a single piece, with an overall concentricity error of no more than 0.05 mm, and the machining error of the cutting blades is no more than ±0.05 mm.

[0017] In conjunction with the first aspect, in an optional implementation, the cutting blade is provided with a variable cross-section structure on its back, wherein the depth of the cross-section near the drill tip at its proximal end is greater than that at its distal end, which facilitates rapid chip removal during initial cutting and avoids chip blockage.

[0018] Multiple staggered serrated micro-blades are provided on the cutting blades, with a width of 0.05-0.2 mm, which are used to further crush bone fragments during the cutting process to generate finer bone paste, which is beneficial for subsequent use as bone regeneration material.

[0019] In conjunction with the first aspect, in an optional embodiment, the drill body 1 and the connecting handle 2 coaxially disposed therewith are integrally machined from medical-grade stainless steel or titanium alloy, and the surface is subjected to vacuum heat treatment and plasma electrolytic polishing to improve corrosion resistance and high strength.

[0020] In conjunction with the first aspect, in an optional implementation, the drill body 1 is capable of withstanding a torque of not less than 45 N·cm, and the length of the microscopic chipping of the cutting edge is not greater than 20 μm after 50 repeated sterilization cycles.

[0021] In conjunction with the first aspect, in an optional implementation, the method includes: the connecting handle 2 is a quick-connect handle with a diameter of 2.35 mm and a slot length of 2.7 mm, for use with a standard dental implant machine and a periodontal turbine handpiece.

[0022] The cylindrical bone harvesting drill provided in this embodiment addresses the challenges of autologous bone harvesting, difficulty in controlling drilling depth, and low precision of traditional tools in oral implant and periodontal surgery. It proposes a structurally optimized solution with high precision, high adaptability, and clinical safety. By setting a 4-10 blade spiral cutting head with a 58°-62° spiral cutting angle and a depth of 0.5-1.45mm, combined with an equidistant circumferential concave depth marking unit structure, it achieves precise pulverization, extraction, and depth control of bone tissue within the cavity, effectively improving the quality and efficiency of bone paste during surgery. The marking unit structure can directly mark the center of the ball head apex, improving the surgeon's positioning accuracy, and is particularly suitable for minimally invasive digital implant navigation.

[0023] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0024] The accompanying drawings, which form part of this specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0025] The present invention can be more clearly understood with reference to the accompanying drawings and the following detailed description, wherein:

[0026] Figure 1 This diagram shows a structural diagram of a cylindrical bone-harvesting drill according to an embodiment of the present invention;

[0027] Figure 2 This diagram shows the structure of a cylindrical bone-harvesting drill according to another embodiment of the present invention. Detailed Implementation

[0028] Various exemplary embodiments of the present invention 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 invention.

[0029] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0030] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0031] 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.

[0032] 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.

[0033] Research has revealed that existing implant preparation drills only function to prepare the implant cavity, lacking the ability to preserve the original autologous bone within the cavity. After preparation, the existing drills completely destroy the original autologous bone within the cavity, making it impossible to retrieve. When the implant is partially exposed after placement and requires bone grafting, artificial bovine bone powder is the only option, which is expensive and yields limited results.

[0034] This invention relates to a novel drill bit specifically designed for preserving autologous bone within implantation cavities. Before preparing the implantation cavity, this drill bit is used to crush the autologous bone into a paste-like substance for preservation. Then, a standard drill bit is used to prepare the implantation cavity and insert the implant. The application scenarios are as follows:

[0035] 1. If the implant is partially exposed after implantation, the autologous bone graft material that was just removed can be directly applied to the surface of the implant.

[0036] 2. If, after implantation, it is found that the implant is not exposed but the surrounding bone is thin, the autologous bone graft material that was just removed can be used to fill the sides and top of the implantation area to widen and raise the bone around the implant, thereby improving the success rate of implantation.

[0037] Third, if it is found that the implant is not exposed after implantation, and it is not necessary to widen or raise the bone, the autologous bone paste that was just removed can be used to fill the exposed root surface of the adjacent tooth to promote periodontal tissue regeneration.

[0038] Existing drills for preparing implant sites only have the capability to prepare the site, not to retain the original autologous bone within it. After preparation, the site is simply an empty cavity with no bone fragments retained. If implant exposure is found after implantation, artificial bovine bone is needed to fill the exposed area to prevent loosening and dislodgement due to incomplete bone encapsulation. Autologous bone, containing osteoblasts and growth factors, is more effective than artificial bovine bone. Current tools for harvesting autologous bone include bone saws, forceps, and chisels, which are highly invasive, and the harvested bone is in block form, lacking a pulverizing tool to fill tiny pores. This invention is specifically designed to prepare autologous bone into powder for precise filling.

[0039] Figure 1 This diagram shows a structural diagram of a cylindrical bone-harvesting drill according to an embodiment of the present invention. Figure 2 This diagram illustrates the structure of a cylindrical bone-harvesting drill according to another embodiment of the present invention, as shown below. Figure 1-2As shown, the cylindrical bone-harvesting drill includes: a drill body 1 and a connecting shank 2 coaxially arranged therewith. The drill body 1 is a cylindrical structure with a diameter of 2.2-5.8 mm. The drill body 1 includes a spiral cutter head integrally machined. The spiral cutter head is composed of 4-10 cutting blades 3 arranged spirally along the axial direction of the drill body 1. The angle between the front cutting edge of each cutting blade 3 and the axis of the drill body 1 is 58°-62°, and the depth of the cutting blade 3 is 0.5-1.45 mm.

[0040] In one embodiment, the length of the drill body 1 is divided into different models such as short and long versions according to clinical needs, which are suitable for bone harvesting surgery in cavities of different depths.

[0041] In one embodiment, the back of the cutting blade 3 is provided with a variable cross-section structure, the depth of the cross-section near the drill tip of the proximal end is greater than that of the distal end, which is conducive to rapid chip removal during the initial cutting and avoids bone chip blockage.

[0042] In one embodiment, multiple staggered serrated micro-blades are provided on the cutting blade 3, with a micro-blade width of 0.05-0.2mm. These micro-blades can further pulverize bone fragments during the cutting process, generating finer bone paste, which is beneficial for subsequent use as bone regeneration material.

[0043] In one embodiment, the foremost end of the drill body 1 is provided with a ball head section. The ball head is hemispherical and its diameter is the same as that of the drill body. It is used for guidance and positioning to prevent deviation during initial drilling and reduce the risk of intraoperative damage. In another embodiment, the surface of the ball head of the drill body 1 is provided with micro-dimples or roughened areas to enhance positioning stability.

[0044] In one embodiment, the connecting handle 2 can be configured as an eccentric shaft mechanism, which can provide axial micro-amplitude vibration frequency of 100-300Hz when connected to an external micro motor, to assist cutting and reduce heat accumulation, thereby improving the efficiency of bone tissue fragmentation.

[0045] In one embodiment, the cutting blade is made of a multi-layer metal composite, with the cutting edge section being a cemented carbide such as tungsten-cobalt alloy and the base connecting section being medical-grade stainless steel or titanium alloy, achieving a good balance between sharpness and toughness.

[0046] In one embodiment, the drill body 1 and the cutter head surface are subjected to plasma spraying treatment to form a diamond-like carbon (DLC) coating or a titanium nitride (TiN) coating to enhance wear resistance, anti-protein adhesion and improve cleaning efficiency.

[0047] In one embodiment, a heat-sensitive color-changing area can be provided on the outer wall of the drill bit. When the temperature of the drill bit rises above 47°C during high-speed cutting, the color of this area changes significantly, prompting the operator to pay attention to irrigation and cooling to prevent bone tissue necrosis.

[0048] In one embodiment, the length of the cylindrical bone-harvesting drill is H1, wherein 25.00mm≤H1≤45.00mm; the length of the connecting handle 2 is H2, and the diameter is D2, wherein 15.00mm≤H2≤25.00mm, and 2.00mm≤D2≤2.50mm.

[0049] In one embodiment, the outer periphery of the drill body 1 is provided with a marking unit 4 for indicating the drilling depth. The marking unit 4 is composed of a plurality of circumferential concave dots spaced 1mm-3mm apart along the axial direction, and is used to mark the distance to the center of the top of the ball head of the drill body 1.

[0050] In one embodiment, the depth of the indentation of the marking unit 4 is 0.1-0.6 mm to ensure that it remains clearly visible even in bloodless or bleeding environments.

[0051] In one embodiment, the length of the cylindrical bone-harvesting drill is H1, which is 41 mm, and the length of the connecting handle 2 is H2, which is 20 mm. The marking unit 4 is provided with 10 concave dots to mark the drilling depth scale from 0 to 21 mm.

[0052] In one embodiment, the length of the cylindrical bone-harvesting drill is H1, which is 33 mm, and the length of the connecting handle 2 is H2, which is 16 mm. The marking unit 4 is provided with 8 concentric circles to mark the drilling depth scale from 0 to 17 mm.

[0053] In one embodiment, the marking indentations at different depths can employ different geometries to achieve visual differentiation. For example, a ring of triangular indentations can be placed every 5 mm as a key depth indicator, while the remaining indentations are standard circles. This type of structure enhances intraoperative depth perception, especially when bleeding obstructs the field of vision, allowing key depths to still be identified through the shape of the indentations.

[0054] In one embodiment, the surface of the marking dimples of the marking unit can be coated with a medical-grade fluorescent coating or rare-earth luminescent material. Under the illumination of a cold light source during surgery, the scale can be clearly identified even in the presence of bleeding or soft tissue obstruction, greatly improving the safety of intraoperative procedures.

[0055] In one embodiment, the drill body 1 is a cylindrical structure with a diameter of 3.3 mm.

[0056] In one embodiment, the angle between the front cutting edge of each cutting blade 3 and the axis of the drill body 1 is 60°.

[0057] In one embodiment, the number of cutting blades 3 of the spiral cutter head is preferably four, six, eight, or ten.

[0058] In one embodiment, the depth of the cutting blade 3 of the spiral cutter head is in a ratio of 1 / 5 to 1 / 4 to the diameter of the drill body 1;

[0059] In one embodiment, the depth of the cutting blade 3 is 0.7 mm.

[0060] In one embodiment, the spiral cutter head of the drill body 1 is machined as a single piece, with an overall concentricity error of no more than 0.05 mm and a machining error of no more than ±0.05 mm for the cutting blades.

[0061] In one embodiment, the spiral cutter head has a helix angle of 15°-25° to crush bone during the cutting process and convey it upward into bone paste.

[0062] In one embodiment, the drill body 1 is a cylindrical structure with a diameter of 3.3 mm, integrally machined from medical-grade titanium alloy, and is compatible with conventional implant operating tables and periodontal handpiece adapters. The front end of the drill body 1 is machined into a helical cutter head, which is an integral structure with the drill body, and the overall concentricity error is no greater than 0.05 mm. The machining accuracy of the cutting blades 3 is controlled within ±0.05 mm.

[0063] In this embodiment, the spiral cutter head is provided with 4 to 10 cutting blades 3 arranged spirally along the axial direction, preferably four, six, eight, or ten blades, to meet the cutting needs of different bone density regions. The front cutting edge of each cutting blade 3 forms a 60° angle with the axis of the drill body 1, which can achieve efficient bone tissue cutting while maintaining drilling stability.

[0064] In this embodiment, the ratio of the cutting blade depth to the drill body diameter is set to 1 / 5 to 1 / 4. For a drill body with a diameter of 3.3 mm, the cutting blade depth is preferably 0.7 mm. This parameter combination ensures that an appropriate amount of bone chips are formed and uniformly delivered as bone paste during the helical cutting process, while maintaining the structural strength of the drill bit.

[0065] Furthermore, the helix angle of the spiral cutter head is 15° to 25°. This range, verified by finite element simulation, is suitable for the formation of a chip removal path on the bone and the uniform delivery of bone paste, helping to prevent bone chip backlog and overheating. In one embodiment, the helix angle increases progressively along the axial direction of the drill body: smoothly transitioning from 15° near the ball head to 25° in the middle and rear sections. This structure reduces bone resistance in the initial drilling phase and enhances chip removal efficiency in subsequent phases, improving intraoperative responsiveness and facilitating the pulverization and upward delivery of bone paste during cutting.

[0066] In one embodiment, the cutting blade 3 can gradually change its cutting depth and helix angle along the axial direction. For example, the cutting depth can increase from 0.5 mm to 0.7 mm from the ball head to the middle section to form a "helical progressive cutting" structure, which helps to remove bone layer by layer, reduce instantaneous drilling load, and is suitable for areas with significant differences in bone density.

[0067] In one embodiment, the drill body 1 and its coaxially connected connecting shank 2 are integrally machined from medical-grade stainless steel (such as 1.4441) or titanium alloy (such as Ti-6Al-4V). After being machined by a precision milling and turning process, its overall structure undergoes vacuum heat treatment to improve the uniformity of internal stress in the material, and is further subjected to plasma electrolytic polishing treatment, which significantly improves the surface roughness control capability (Ra≤0.4μm), enhances corrosion resistance, protein adhesion resistance, and long-term sterilization durability, and ensures that the cutting edge remains sharp and the material integrity remains even under repeated high-temperature and high-pressure sterilization conditions.

[0068] In one embodiment, the drill body as a whole can withstand a torque of not less than 45 N·cm and does not undergo plastic deformation or fracture in clinical high-density bone drilling scenarios. After 50 high-temperature and high-pressure steam sterilization tests, the micro-chipping length of its cutting blades is controlled to be no more than 20 μm, demonstrating good reusability and cutting retention.

[0069] In another embodiment, the connecting handle 2 is a quick-connect handle with a diameter of 2.35 mm, and its front end has a standard groove structure for use with conventional dental implant handpieces and periodontal minimally invasive handpieces. The groove length of the connecting handle is set to 2.7 mm to adapt to current mainstream interface sizes and be compatible with commercially available automatic clamping systems. A stop ring is provided at the tail end of the connecting handle to prevent excessive insertion, improve the stability of the fit, and avoid rotational slippage during surgery.

[0070] This invention provides a cylindrical bone harvesting drill that addresses the challenges of autologous bone harvesting, difficulty in controlling drilling depth, and low precision of traditional tools in oral implant and periodontal surgery. It proposes a structurally optimized solution with high precision, high adaptability, and clinical safety. By setting a 4-10 blade spiral cutting head with a 58°-62° spiral cutting angle and a depth of 0.5-1.45mm, combined with an equidistant circumferential concave depth marking unit structure, it achieves precise fragmentation, extraction, and depth control of bone tissue within the cavity, effectively improving the quality and efficiency of bone paste during surgery. The marking unit structure can directly mark the center of the ball head apex, improving the surgeon's positioning accuracy, and is particularly suitable for minimally invasive digital implant navigation.

[0071] This invention utilizes precision machining with medical-grade stainless steel and undergoes vacuum heat treatment and plasma electrolytic polishing to ensure the entire device possesses high strength, corrosion resistance, and resistance to multiple sterilization processes, meeting high-standard clinical usage requirements. The cutting blade error is controlled within ±0.05mm, and the overall concentricity error is ≤0.05mm, enabling it to stably adapt to dental implant machines and periodontal turbine handpieces as a precision medical device. It allows for stable operation in complex, confined, and bone-heterogeneous areas, significantly improving dental surgical efficiency, safety, and postoperative osseointegration quality.

[0072] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For system embodiments, since they largely correspond to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0073] The methods and systems of this invention may be implemented in many ways. For example, they may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order of steps for the methods is for illustrative purposes only, and the steps of the methods of this invention are not limited to the specific order described above unless otherwise specifically stated. Furthermore, in some embodiments, this invention may also be implemented as a program recorded on a recording medium, the program comprising machine-readable instructions for implementing the methods according to this invention. Thus, this invention also covers recording media storing programs for executing the methods according to this invention.

[0074] The description of this utility model is given for illustrative and descriptive purposes only, and is not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the utility model, and to enable those skilled in the art to understand the utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A cylindrical bone-harvesting drill, characterized in that, include: The drill body (1) and the connecting shank (2) coaxially mounted therewith, The drill body (1) is a cylindrical structure with a diameter of 2.2-5.8 mm; The drill body (1) includes an integrally machined spiral cutter head, which is composed of 4-10 cutting blades (3) arranged in a spiral shape along the axial direction of the drill body (1); The angle between the front cutting edge of each cutting blade (3) and the axis of the drill body (1) is 58°-62°, and the depth of the cutting blade (3) is 0.5-1.45mm; The depth of the cutting blade (3) of the spiral cutter head is in the ratio of 1 / 5 to 1 / 4 of the diameter of the drill body (1); The spiral cutter head has a helix angle of 15°-25° and is used to crush bone and transport it upward into bone paste during the cutting process.

2. The cylindrical bone-harvesting drill according to claim 1, characterized in that, include: The outer periphery of the drill body (1) is provided with a marking unit (4) for indicating the drilling depth. The marking unit (4) consists of several circumferential concave circles with a uniform axial spacing of 1mm-3mm, used to mark the distance to the center of the ball head of the drill body (1).

3. The cylindrical bone-harvesting drill according to claim 2, characterized in that, include: The depth of the indentation of the marking unit (4) is 0.1-0.6 mm to ensure that it is still clearly visible in the absence of blood or in the presence of bleeding.

4. The cylindrical bone-harvesting drill according to any one of claims 1-3, characterized in that, include: The length of the cylindrical bone-harvesting drill is H1, where 25.00mm ≤ H1 ≤ 45.00mm; The length of the connecting handle (2) is H2 and the diameter is D2, wherein 15.00mm≤H2≤25.00mm and 2.00mm≤D2≤2.50mm.

5. The cylindrical bone-harvesting drill according to claim 2, characterized in that, include: The length of the cylindrical bone-harvesting drill is H1, which is 41 mm, and the length of the connecting handle (2) is H2, which is 20 mm. The marking unit (4) is provided with 10 concave dots to mark the drilling depth scale of the cylindrical bone-harvesting drill from 0 to 21 mm. and / or The length of the cylindrical bone-harvesting drill is H1, which is 33 mm, and the length of the connecting handle (2) is H2, which is 16 mm. The marking unit (4) is provided with 8 concave dots to mark the drilling depth scale of the cylindrical bone-harvesting drill from 0 to 17 mm.

6. The cylindrical bone-harvesting drill according to claim 1, characterized in that, include: The drill body (1) is a cylindrical structure with a diameter of 3.3 mm; and / or The angle between the front cutting edge of each cutting blade (3) and the axis of the drill body (1) is 60°; and / or The number of cutting blades (3) of the spiral cutter head is four, six, eight or ten.

7. The cylindrical bone-harvesting drill according to claim 1, characterized in that, include: The depth of the cutting blade (3) is 0.7 mm.

8. The cylindrical bone-harvesting drill according to claim 1, characterized in that, include: The spiral cutter head of the drill body (1) is machined as a single unit, with an overall concentricity error of no more than 0.05 mm and a machining error of no more than ±0.05 mm for the cutting blades.

9. The cylindrical bone-harvesting drill according to claim 1, characterized in that, include: The cutting blade (3) has a variable cross-section structure on its back. The depth of its cross-section near the drill tip is greater than that of its distal end, which facilitates rapid chip removal during initial cutting and avoids bone chip blockage. and / or Multiple staggered serrated micro-blades are provided on the cutting blade (3), with a width of 0.05-0.2 mm, which are used to further crush bone fragments during the cutting process to generate finer bone paste.

10. The cylindrical bone-harvesting drill according to claim 1, characterized in that, include: The drill body (1) and the connecting handle (2) coaxially arranged therewith are made of medical stainless steel or titanium alloy in one piece, and the surface is subjected to vacuum heat treatment and plasma electrolytic polishing to improve corrosion resistance and high strength. and / or The drill body (1) as a whole can withstand a torque of not less than 45 N·cm, and the length of the micro-chipping of the cutting edge after repeated sterilization 50 times is not greater than 20 μm. and / or The connecting handle (2) is a quick-connect handle with a diameter of 2.35 mm and a slot length of 2.7 mm, used to cooperate with standard dental implant machines and periodontal turbine handpieces.

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