Ballpoint with a sharp tip

Abstract

The application discloses a spherical drill with spurs, and relates to the field of medical devices, wherein the spherical drill with spurs comprises a spherical working end and a connecting handle; a plurality of micro-cone-shaped protruding parts are arranged in space and in order on the spherical surface of the spherical working end, and are used for cutting or disturbing a target bone surface in a rotating state; the diameter of the protruding parts is 0.4-0.6 mm, the height is 0.6-0.8 mm, the whole is axially symmetrical, and can be arranged in multiple meridional and latitudinal directions; the arrangement mode is various; the total length of the drill body is 30-45 mm, and the drill body is suitable for being used in a low-speed power equipment; the structure can be integrally formed or high-precision assembled, and is prepared from a material with good biocompatibility; the application can slightly cut the surgical area while reserving the integrity of a bone bed, makes the hard inner wall of a tooth extraction nest, a periodontal bone wall and a bionic implant nest hole wall soft, promotes the outflow of blood, stimulates the secretion of growth factors and the crawling of osteoblasts, and promotes the healing of the surgical area.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instruments, and in particular to a spherical thorn drill used in oral implantation, periodontal surgery and tooth extraction surgery. Background Art

[0002] With the advancement of dental implant technology and periodontal regenerative medicine, the requirements for minimally invasive bone tissue treatment, healing promotion, and implant stability in the surgical area are increasing. Traditionally, bone treatment with instruments such as scoops, bone rasps, lasers, or osteotome tools is used for alveolar socket shaping, implant preparation, and periodontal debridement. However, these tools have limitations, such as insufficient cutting precision, poor irritation, unsatisfactory biological response, and significant trauma.

[0003] In view of this, how to provide a new type of medical device drill that can effectively cut hard bone and activate tissue regeneration mechanism to improve the success rate and healing quality of implant or periodontal treatment has become a technical problem that needs to be solved urgently in existing technologies. Summary of the Invention

[0004] A technical problem to be solved by the embodiments of the present invention is how to provide a medical device drill with a new structure that can not only effectively cut hard bone but also activate tissue regeneration mechanisms, thereby improving the success rate and healing quality of implants or periodontal treatments, thereby solving the problems existing in the prior art.

[0005] In a first aspect, the present application provides a spherical barbed drill, comprising: a spherical working end, a connecting handle coaxially arranged with the spherical working end,

[0006] The outer surface of the spherical working end is provided with a plurality of protrusions distributed in an orderly manner in space, and the protrusions are approximately conical in shape;

[0007] The diameter of the spherical working end ranges from 2.00 mm to 5.00 mm;

[0008] The bottom diameter of the protrusion is between 0.40 and 0.60 mm, and the height range is between 0.60 and 0.80 mm;

[0009] The ratio of the height of the protrusion to the diameter of the spherical working end is between 12% and 40%;

[0010] The orderly distributed protrusions are axially symmetrically distributed on the spherical outer surface of the spherical working end to achieve cutting or bone disturbance functions.

[0011] The structure of the spherical working end is suitable for processing the inner wall of the alveolar socket, the periodontal bone wall, and the inside of the bionic implant cavity, and is used for micro-cutting hard bone to promote blood outflow, growth factor secretion, and osteoblast crawling out.

[0012] In combination with the first aspect, the optional steps include:

[0013] The diameter of the spherical working end ranges from 2.00 mm to 5.00 mm.

[0014] In combination with the first aspect, optionally, the protrusions on the spherical surface of the spherical working end are arranged in multiple longitude and latitude directions and arranged along the circumferential direction.

[0015] In combination with the first aspect, optionally, the number of the protrusions of the spherical working end is not less than 20 and not more than 80.

[0016] In combination with the first aspect, optionally, the protrusions are arranged in any one of the following ways or a combination thereof:

[0017] 3 to 6 circles of protrusions are arranged along the latitude direction of the spherical surface, and the number of protrusions distributed in each circle is 5 to 20;

[0018] and / or

[0019] The angle between adjacent protrusions is 15° to 36°;

[0020] and / or

[0021] The protrusions in each circle are staggered along different latitude angles to enhance the spherical coverage.

[0022] In combination with the first aspect, the optional steps include:

[0023] The diameter of the spherical working end is 2.20 mm;

[0024] The protrusions are arranged on different circumferences in numbers of 5, 10, 12, and 10, and the angle between adjacent protrusions is 30°.

[0025] In combination with the first aspect, the optional steps include:

[0026] The diameter of the spherical working end is 3.00 mm;

[0027] The protrusions are arranged on different circumferences in numbers of 6, 12, 15, 16, 15 and 12, and the angle between adjacent protrusions is 22.5°.

[0028] In combination with the first aspect, optionally, the method includes: the bottom diameter of the protrusion is 0.50 mm and the height is 0.70 mm.

[0029] In combination with the first aspect, the optional steps include:

[0030] The length of the spherical thorn drill is H1, wherein 30.00 mm ≤ H1 ≤ 45.00 mm;

[0031] The diameter of the connecting handle is D2, wherein 2.00 mm ≤ D2 ≤ 2.50 mm.

[0032] In combination with the first aspect, optionally, the method includes: a ratio of the height of the protrusion to the diameter of the spherical working end is 1 to 3.

[0033] In combination with the first aspect, the optional steps include:

[0034] The protrusions and the spherical structure of the spherical working end are integrally formed through integral processing, and the direction of each protrusion has radial or near-radial directivity relative to the center of the sphere.

[0035] In combination with the first aspect, optionally, one end of the connecting handle is provided with a connecting end portion, and the connecting end portion includes a step, a positioning groove or a clamping member for connecting to the rotary power device.

[0036] In combination with the first aspect, the optional steps include:

[0037] The spherical thorn drill is made of stainless steel, titanium alloy, ceramic or biocompatible polymer material, and is prepared through CNC machining, laser ablation, micro electroforming or metal injection molding technology.

[0038] In combination with the first aspect, optionally, the method includes controlling the surface roughness Ra value between the protrusions to be between 0.1 and 1.0 microns, so as to achieve both cutting efficiency and the function of stimulating tissue regeneration.

[0039] In combination with the first aspect, optionally, the method includes: the connecting handle of the spherical barbed drill is connected to a low-speed power device with a rotation speed of less than 10,000 rpm, so as to achieve fine micro-cutting through a low-speed rotary cutting method while avoiding thermal damage.

[0040] The spherical barbed drill provided by the present invention, by providing multiple axially symmetrical, spatially ordered miniature conical protrusions on the surface of the spherical working end, utilizes its multi-angle bone perturbation and shallow cutting function during low-speed rotation to achieve treatment of the inner wall of the alveolar socket, the periodontal bone wall, and the interior of the bionic implant cavity, which can promote blood outflow, growth factor secretion, and osteoblast migration, thereby accelerating the healing of the surgical area. In addition, combined with the protrusion layout method, structural size optimization, and overall molding processing technology, the drill bit of the present invention has excellent cutting efficiency, biocompatibility, and minimally invasive adaptability. It can activate local osteogenic signaling pathways and extracellular matrix reconstruction mechanisms, promote rapid postoperative healing and long-term stable bone integration, and effectively improve the success rate and prognosis quality of oral implant and periodontal regeneration surgeries.

[0041] This application can make slight cuts in the surgical area while preserving the integrity of the bone bed, making the hard inner wall of the extraction socket, periodontal bone wall, and bionic implant cavity wall soft, promoting blood outflow, stimulating the secretion of growth factors and the crawling of osteoblasts, and promoting the healing of the surgical area.

[0042] 1. Micro-cutting of the inner wall of the extraction socket: The flowing blood can form a protective layer on the dry inner wall of the extraction socket, reducing the incidence of "dry socket" after tooth extraction.

[0043] 2. Micro-cutting of periodontal bone wall surface: The micro-cut bone surface rich in blood, growth factors, and osteoblasts and the implantation of autologous bone mud inside the bone surface are more rapid in bone remodeling and have better periodontal regeneration effect than bone grafting on untreated hard and dry bone surface.

[0044] 3. Micro-cutting of the inner wall of the bionic implant cavity: The soft inner wall of the cavity rich in blood, growth factors, and osteoblasts after micro-cutting treatment is more likely to form a strong bone bond with the surface of the bionic implant.

[0045] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0047] The present invention can be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0048] Figure 1 A structural diagram showing a spherical barbed drill according to one embodiment of the present invention;

[0049] Figure 2 A structural diagram showing a spherical barbed drill according to another embodiment of the present invention;

[0050] Figure 3 An enlarged structural view showing a spherical working end of a spherical barbed drill according to one embodiment of the present invention;

[0051] Figure 4 An enlarged structural view showing a spherical working end of a spherical barbed drill according to another embodiment of the present invention. DETAILED DESCRIPTION

[0052] 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 of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0053] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0054] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0055] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0056] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0057] Figure 1 A structural diagram of a spherical barbed drill according to an embodiment of the present invention is shown. Figure 2 A structural diagram showing a spherical barbed drill according to another embodiment of the present invention is shown. Figure 3 An enlarged structural view of a spherical working end 11 of a spherical barbed drill according to one embodiment of the present invention is shown. Figure 4 FIG. 1 is an enlarged view of the structure of a spherical working end 11 of a spherical thorn drill according to another embodiment of the present invention. Figure 1-4 As shown, the spherical barbed drill comprises a spherical working end 11 and a coaxially arranged connecting handle 12. The outer surface of the spherical working end 11 is provided with multiple spatially ordered protrusions 13, each of which is approximately conical in shape. The base diameter of each protrusion 13 ranges from 0.40 to 0.60 mm, and the height ranges from 0.60 to 0.80 mm. The ordered protrusions 13 are axially symmetrically distributed around the spherical outer surface of the spherical working end 11, enabling cutting or bone disturbance. To achieve spatial coverage density and cutting consistency, adjacent circles of protrusions 13 are staggered to form a three-dimensional interlaced structure. The protrusion structure of the spherical working end 11 is suitable for minor incisions in implant cavity walls, induced stimulation of extraction socket walls, and surgical field preparation during periodontal regeneration surgery.

[0058] In one embodiment, the ratio of the height of the protrusion to the diameter of the spherical working end is between 12% and 40%; preferably, the ratio of the height of the protrusion to the diameter of the spherical working end is 1 to 3. The conical protrusion is clearly visible to the naked eye and has a needle-like structure, which can effectively cut and scratch the tooth socket, effectively stimulating osteoblast regeneration.

[0059] In one embodiment, the protrusion 13 is a conical thorn tip structure, which means that its overall shape is approximately a right cone, with a sharp top and a gradually expanding bottom, which is used to directionally penetrate, disturb and crush the surface of bone tissue during rotation to achieve minimally invasive cutting and bone preservation functions.

[0060] In one embodiment, to enhance multi-angle cutting capabilities on aspheric socket bone walls, a secondary cutting edge or barbed micro-tooth structure can be provided on the side of the spike tip cone. This structure extends 0.1mm–0.2mm deep along the spike tip axis, with a serration angle of less than 40°, forming a "bidirectional micro-cutting edge" that allows for micro-perturbation tissue cutting during advancement and withdrawal.

[0061] In one embodiment, the spike tip utilizes a dual-layer structure: an inner layer of a thermosensitive memory metal (such as Nitinol) and an outer layer of titanium alloy or ceramic. The spike tip is rigid at room temperature to accommodate hard bone removal, but undergoes microflexion at a set temperature, which can be human body temperature, such as 36–37°C, to reduce penetration depth and release micromechanical stimulation to induce bone remodeling during postoperative recovery.

[0062] In one embodiment, the entire drill body surface can be sprayed with a silver ion-containing nano-antibacterial coating (thickness <100nm), which continuously releases trace amounts of antibacterial ions during surgery, effectively suppressing the risk of postoperative infection. It is particularly suitable for use in diabetic patients or reconstructive surgery.

[0063] In one embodiment, to enhance safety during bone wall manipulation, a depth-limiting marking structure can be provided on the connecting handle 12. This marking structure is used to mark the position of the spike structure at the top of the spherical working end 11. When the drill bit is inserted to the set depth, it alerts the surgeon to prevent accidental drilling too deep and damaging the inferior alveolar nerve. Specifically, the depth-limiting marking structure can be provided in the form of a high-contrast visual marking ring in black or blue.

[0064] This embodiment provides a spherical barbed drill for oral surgery. The spherical working end 11 has a spherical or approximately spherical structure. The diameter of the sphere ranges from 2.00 mm to 5.00 mm, and the preferred value may be 2.20 mm or 3.00 mm. The selection and matching is based on the clinically required preparation depth and diameter of the cavity.

[0065] The outer surface of the spherical working end 11 is provided with a plurality of miniature conical spike structures. The structures provided in this embodiment of the present invention are arranged in an axisymmetric and orderly manner, with a layered arrangement along the spherical surface based on the longitude and latitude. Specifically, the protrusions 13 (i.e., the conical spikes) are arranged in three to six circles along the spherical surface's latitude, with each circle containing between five and twenty protrusions, depending on the spherical diameter and the arrangement density.

[0066] In addition, in order to improve the coverage and cutting continuity, the adjacent circles of thorn tips are arranged at an angle of 15° to 36° relative to the previous circle, so that the overall spherical thorn array is formed with staggered arrangement and no dead angle penetration.

[0067] The structural design provided by the embodiments of the present invention achieves uniform spherical perturbations in all directions during drill bit rotation, enhancing micro-cutting of the cavity wall. It is particularly suitable for minimally invasive incisions in areas with dense bone or restricted anatomical angles. It promotes blood flow, stimulates the secretion of growth factors, and promotes the migration of osteoblasts, thereby promoting healing of the surgical area.

[0068] like Figure 3 As shown in a specific embodiment, the spherical working end 11 has a diameter of 3.00 mm and is equipped with six circles of spikes, each containing 6, 12, 15, 16, 15, and 12 spikes, arranged from top to bottom to form a denser grid, suitable for surgeries requiring higher bone density or larger bone volumes for micro-dissection. Each circle of spikes is also arranged symmetrically, with adjacent spikes maintaining an angle of 22.5°. The base diameter d2 of the spikes ranges from 0.40 to 0.60 mm, and the height h2 ranges from 0.60 to 0.80 mm. This ensures that more spherical area is covered during rotary cutting, preventing missed areas from causing uneven bone comminution.

[0069] like Figure 4 As shown, in one specific embodiment, the spherical working end 11 has a diameter of 2.20 mm and is provided with four rings of spikes on its spherical surface, arranged from the pole to the equator as follows: the first ring has five spikes, the second ring has 10 spikes, the third ring has 12 spikes, and the fourth ring has 10 spikes. The spikes have a base diameter d1 between 0.40 and 0.60 mm and a height h1 between 0.60 and 0.80 mm. Each ring of spikes is evenly distributed along the corresponding circumference, with adjacent spikes forming an angle of 30°. The overall arrangement forms a symmetrical staggered array, providing balanced perturbation and excellent micro-cutting results.

[0070] In a specific embodiment, both structures described above use a conical spike tip as the protrusion 13. The base diameter of each cone is 0.50 mm, the height is 0.70 mm, and the sharpening angle of the top is set within a moderate range, which not only provides good puncture force but also keeps it within a safe range to prevent excessive penetration into adjacent anatomical structures. The structure provided by the embodiment of the present invention can achieve directional disturbance and crushing of the surface bone in the cavity under low-speed rotation drive (e.g., 800-1500 rpm), while avoiding damage to the integrity of the bone bed, which is conducive to promoting blood outflow, stimulating the secretion of growth factors and the migration of osteoblasts, and promoting healing of the surgical area.

[0071] The parameter combination in this embodiment not only meets the structural functionality, but also facilitates standardized manufacturing and is adapted to conventional implant cavity preparation processes. It is particularly suitable for minimally invasive surgical solutions in the aesthetic area of ​​the anterior teeth and areas with insufficient bone width.

[0072] In a specific embodiment, the total length H1 of the entire spherical barbed drill is controlled between 30.00 mm and 45.00 mm to adapt to the anatomical depth and surgical path of different tooth areas; the diameter D2 of the connecting handle 12 is set to 2.00 mm to 2.50 mm to ensure compatibility with the clamping interface of mainstream dental surgical mobile phones or rotary power devices, while providing sufficient torsional stability.

[0073] In a specific embodiment, the spike tips of the spherical working end 11 are fixed to the outer wall of the sphere by integral processing or other high-precision assembly methods. The arrangement is axially symmetrical, and each spike tip roughly points to the center of the sphere or extends radially, so as to ensure that the direction of disturbance of the bone surface by each spike tip is consistent during rotation, forming uniform bone mud particles and avoiding large-scale tearing of surface bone fragments.

[0074] The spherical barbed drill in this embodiment is widely applicable to bone intervention of anatomical structures such as alveolar socket walls, implant cavity edges, alveolar bone tops or near-root surface areas. Its specific functions include but are not limited to: forming a minimally invasive injury interface to activate bone marrow response; inducing the activation of bone regeneration signal pathways; providing an induced microenvironment to promote extracellular matrix deposition and assist periodontal regeneration.

[0075] In a specific embodiment, the drill bit is preferably made of medical-grade stainless steel, and may also be made of titanium alloy, ceramic material, or polymer material with excellent biocompatibility. It is manufactured through advanced processes such as CNC machining (CNC), laser ablation, micro-electroforming, or metal injection molding (MIM) to ensure the geometric accuracy and wear resistance of the thorn tip structure.

[0076] In a specific embodiment, in order to improve the clinical effect, the surface roughness Ra value between the thorn tips is controlled between 0.1-1.0 μm. Within this range, it can provide sufficient friction disturbance force for crushing bone without causing tissue tearing due to excessive surface roughness, which helps to promote blood coagulation and growth factor attachment in the wound microenvironment.

[0077] In a specific embodiment, the power device adapted for the spherical barbed drill is a low-speed rotating device with a rotation speed of less than 10,000 rpm. It can still achieve stable cutting and bone mud retention at low speed, effectively avoiding the risk of heat accumulation caused by high-speed equipment, reducing the temperature increase of bone tissue in the surgical area, and preventing bone necrosis or delayed healing caused by thermal damage.

[0078] The present invention provides an implant surgery drill bit with a bone tissue micro-cutting function, specifically a drill bit that performs slight cutting on the surgical area, making the hard inner wall of the tooth extraction socket, the periodontal bone wall, and the bionic implant cavity wall soft, promoting blood outflow, stimulating the secretion of growth factors and the crawling out of osteoblasts, and promoting the healing of the surgical area.

[0079] The present invention achieves "edge disturbance, micro-cutting, and promoted healing" through a unique structure, effectively solving clinical problems such as insufficient cutting accuracy, poor stimulation, unsatisfactory biological response effects, and greater trauma of traditional digging spoons, bone files, lasers, or bone knives.

[0080] The present invention uses conical spikes evenly distributed on the surface of a spherical structure to perform shallow perturbations and micro-cuts on the inner wall of hard bone, forming an active surface layer that promotes growth. It can be used in the following three types of intraoperative clinical scenarios:

[0081] 1. Micro-cutting of the inner wall of the extraction socket: The flowing blood can form a protective layer on the dry inner wall of the extraction socket, reducing the incidence of "dry socket" after tooth extraction.

[0082] 2. Micro-cutting of periodontal bone wall surface: The micro-cut bone surface rich in blood, growth factors, and osteoblasts and the implantation of autologous bone mud inside the bone surface are more rapid in bone remodeling and have better periodontal regeneration effect than bone grafting on untreated hard and dry bone surface.

[0083] 3. Micro-cutting of the inner wall of the bionic implant cavity: The soft inner wall of the cavity rich in blood, growth factors, and osteoblasts after micro-cutting treatment is more likely to form a strong bone bond with the surface of the bionic implant.

[0084] This invention has the specific function of "softening" hard bone, which is of great significance for the placement of bionic implants. It can significantly improve the success rate of bionic implants. This invention can also be used for the preparation of hard bone extraction sockets and hard bone periodontal areas, promoting better healing of the surgical area.

[0085] Each embodiment in this specification is described in a progressive manner, with each embodiment focusing on its differences from the other embodiments. References to the same or similar parts between the various embodiments are sufficient. For system embodiments, since they largely correspond to method embodiments, their description is relatively simple. For relevant parts, references to the description of the method embodiments are sufficient.

[0086] The method and system of the present invention may be implemented in many ways. For example, the method and system of the present invention may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above sequence of steps for the method is for illustration only, and the steps of the method of the present invention are not limited to the sequence specifically described above, unless otherwise specified. In addition, in some embodiments, the present invention may also be implemented as a program recorded in a recording medium, which includes machine-readable instructions for implementing the method according to the present invention. Thus, the present invention also covers recording media that store programs for executing the method according to the present invention.

[0087] The description of the present invention has been presented for purposes of illustration and description and is not intended to be exhaustive or to limit the invention to the form 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 of the invention and its practical application and to enable those skilled in the art to understand the invention and design various embodiments with various modifications as are suited for specific applications.

Claims

1. A spherical thorn drill, characterized in that: include: A spherical working end and a connecting handle coaxially arranged with the spherical working end. The outer surface of the spherical working end is provided with a plurality of protrusions distributed in an orderly manner in space, and the protrusions are approximately conical in shape; The diameter of the spherical working end ranges from 2.00 mm to 5.00 mm; The bottom diameter of the protrusion is between 0.40 and 0.60 mm, and the height ranges from 0.60 to 0.80 mm; The ratio of the height of the protrusion to the diameter of the spherical working end is between 12% and 40%; The orderly distributed protrusions are axially symmetrically distributed on the spherical outer surface of the spherical working end to achieve cutting or bone disturbance functions. The structure of the spherical working end is suitable for processing the inner wall of the alveolar socket, the periodontal bone wall, and the inside of the bionic implant cavity, and is used for micro-cutting hard bone to promote blood outflow, growth factor secretion, and osteoblast crawling out.

2. The spherical thorn drill according to claim 1, characterized in that: include: The protrusions on the spherical surface of the spherical working end are arranged in multiple longitudinal and latitudinal directions and arranged along the circumferential direction; and / or The number of the protrusions on the spherical working end is not less than 20 and not more than 80.

3. The spherical thorn drill according to claim 1, characterized in that: The arrangement of the protrusions includes any one of the following or a combination thereof: 3 to 6 circles of protrusions are arranged along the latitude direction of the spherical surface, and the number of protrusions distributed in each circle is 5 to 20; and / or The angle between adjacent protrusions is 15° to 36°; and / or The protrusions in each circle are staggered along different latitude angles to enhance the spherical coverage.

4. The spherical thorn drill according to claim 2, characterized in that: include: The diameter of the spherical working end is 2.20 mm; The protrusions are arranged on different circumferences in numbers of 5, 10, 12, and 10, and the angle between adjacent protrusions is 30°.

5. The spherical thorn drill according to claim 2, characterized in that: include: The diameter of the spherical working end is 3.00 mm; The protrusions are arranged on different circumferences in numbers of 6, 12, 15, 16, 15 and 12, and the angle between adjacent protrusions is 22.5°.

6. The spherical thorn drill according to claim 1, characterized in that: include: The bottom diameter of the protrusion is 0.50 mm and the height is 0.70 mm.

7. The spherical thorn drill according to claim 1, characterized in that: include: The length of the spherical thorn drill is H1, wherein 30.00 mm ≤ H1 ≤ 45.00 mm; The diameter of the connecting handle is D2, 2.00mm≤D2≤2.50mm.

8. The spherical thorn drill according to claim 1, characterized in that: include: The ratio of the height of the protrusion to the diameter of the spherical working end is 1 to 3.

9. The spherical thorn drill according to claim 1, characterized in that: include: The protrusions and the spherical structure of the spherical working end are integrally formed by integral processing, and the direction of each protrusion has radial or near-radial directionality relative to the center of the sphere; and / or One end of the connecting handle is provided with a connecting end portion, and the connecting end portion includes a step, a positioning groove or a clamping member, and is used for connecting to a rotary power device.

10. The spherical barbed drill according to claim 1, characterized in that: include: The spherical burr is made of stainless steel, titanium alloy, ceramic or biocompatible polymer material and is prepared by CNC machining, laser ablation, micro electroforming or metal injection molding; and / or The surface roughness Ra value between the protrusions is controlled between 0.1 and 1.0 microns to balance cutting efficiency and the function of stimulating tissue regeneration; and / or The connecting handle of the spherical barbed drill is connected to a low-speed power device with a rotation speed of less than 10,000 rpm, and fine micro-cutting is achieved through a low-speed rotary cutting method while avoiding thermal damage.

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