Drill with bone fragment collector

Description

1 / 7 DRILL WITH BONE FRAGMENT COLLECTOR Technological sector of the Utility Model

[001] The present utility model belongs to the surgical and dental instruments sector, and refers, more specifically, to a drill with a bone fragment collector, intended for the controlled removal and collection of bone material during surgical procedures, especially in the oral cavity, with potential application in traumatology and regenerative surgery. State of the Art

[002] In the context of surgical procedures that require the controlled removal of bone tissue, especially in dentistry, traumatology, and regenerative surgery, it is common to need to collect bone fragments from the donor area for later use in the recipient area. The biological quality of these fragments, the volume collected, and the safety of the procedure are critical factors for clinical success, directly influencing the regeneration rate and the predictability of the results.

[003] The solutions traditionally employed for this purpose can be broadly grouped into manual tools and automatic drill-type instruments. Manual bone scrapers, while allowing some operator control, are poorly suited for limited surgical areas, require longer operating times, and demand significant manual effort, which limits the efficiency of the collection. In contrast, automatic drill-type instruments are faster, but usually operate at high speeds, with symmetrical cutting geometry and multiple cutting edges, resulting in higher cutting pressure, heating of the bone tissue, and excessive fragmentation of the collected material. As a consequence, the fragments obtained tend to be smaller, more damaged, and less biologically viable, and often require auxiliary cooling systems.

[004] Several solutions are known in the state of the art for the automated collection of bone fragments. Document RU221143U1 describes a collecting drill equipped with an internal channel for receiving chips. Petition 870260039758, dated 04 / 29 / 2026, page 5 / 16 2 / 7 bone fragments, seeking to increase collection efficiency compared to conventional tools. Documents EP2742896A2 and WO2021085681A1 disclose surgical instruments in which the cutting element is associated with caps, springs, or internal components that function as reservoirs for the removed material, providing additional structures for retaining fragments during drilling. Although such solutions represent advances over manual tools, they have significant limitations, since the presence of internal components in the reservoir significantly reduces the useful storage volume, requiring frequent interruptions of the procedure for emptying. Furthermore, the structural separation between the cutting element and the collector imposes constructive restrictions that hinder increasing the reservoir capacity without compromising the geometry or operation of the instrument.

[005] Another aspect common to known solutions lies in the adoption of drills with two symmetrical cutting edges, which require higher rotations for efficient material removal. This characteristic intensifies local heating, favors thermal degradation of the bone, and leads to obtaining crushed fragments or amorphous mass, less suitable for grafting. In addition, many available instruments use sharp needle-type tips for centering, which makes the procedure more traumatic, reduces stability during the operation, and increases the risk of soft tissue injury, especially in the absence of a dedicated auxiliary instrument for initial drilling.

[006] Given this scenario, it is observed that the state of the art does not offer a solution that combines, in an integrated way, high collection capacity, preservation of the biological viability of bone fragments, operation at low speeds and greater operative safety. In particular, the need remains open for an instrument in which the reservoir has a maximized volume, is free of internal components, and acts in a functionally integrated manner with the cutting element, enabling the collection of larger and less damaged fragments, without excessive heating and with better axis control. Petition 870260039758, dated 04 / 29 / 2026, page 6 / 16 3 / 7 during the surgical procedure. This technical gap motivates the development of the present utility model. Utility Model Updates

[007] The proposed utility model patent introduces relevant functional improvements in the use of instruments intended for the collection of bone fragments, by bringing together, in a single constructive solution, characteristics that increase the efficiency of the surgical procedure, preserve the biological quality of the collected material, and increase operative safety. The main innovation lies in the configuration of the reservoir as a cavity entirely free of internal components, which acts simultaneously as a cutting and storage element, allowing the entire internal volume to be effectively used for the collection of bone fragments. This constructive arrangement eliminates the limitations imposed by lids, springs, or internal rods present in known solutions, making it possible to obtain a significantly larger volume of material without the need for frequent interruptions of the procedure to empty the collector.

[008] Another relevant functional improvement stems from the adoption of a single-sided cutting blade, associated with an auxiliary cutting edge, which allows for the removal of bone tissue with less effort and less contact pressure. This configuration enables the instrument to operate at low speeds, substantially reducing heat generation during cutting and eliminating the need for external cooling systems. As a result, bone material is removed in the form of thin sheets or small fragments, preserving the structural integrity and biological viability of the tissue, in contrast to the excessive grinding observed in conventional two-edged symmetrical drills.

[009] The instrument's functional geometry also promotes significant gains in terms of control and safety. The blunt-ended centering pin, in cooperation with a pilot hole previously drilled by an independent guide drill, ensures the axial alignment of the instrument during operation, reducing the risk of slippage and minimizing trauma to adjacent tissues. Unlike known solutions that use sharp tips for Petition 870260039758, dated 04 / 29 / 2026, page 7 / 16 4 / 7 centering, the blunt end combined with laterally positioned cutting areas provides greater predictability of movement and less aggression to bone and soft tissues.

[010] Additionally, the possibility of sizing the reservoir according to the surgeon's needs, while maintaining the geometry of the cutting element unchanged, gives the instrument versatility and expands its field of clinical application. The combination of a reduced collection radius and greater depth of action allows for the retrieval of cancellous bone from specific regions, favoring faster regeneration and a higher quality graft. Together, these functional and constructive improvements characterize the novelties achieved by the utility model, offering a more efficient, safe and biologically favorable technical solution compared to instruments known in the prior art. Description of the attached figures

[011] In order for the present utility model to be fully understood and put into practice by any technician in this technological sector, it will be described in a clear, concise and sufficient manner, based on the attached figures, which illustrate and support it, listed below: Figure 1 represents a perspective view of the drill bit; Figure 2 represents an exploded perspective view of the drill bit; Figure 3 represents an exploded bottom perspective view of the drill bit; Figure 4 represents a bottom perspective view of the cut section; Figure 5 represents an exploded front view of the drill bit, highlighting the cutting thickness of the blade; Detailed description of the Utility Model

[012] The drill with bone fragment collector is composed of an assembly formed by two main interconnectable components, comprising a cap (1) associated with a rotational drive rod (2) and a reservoir body (6). The cap (1) has a structural base (3) from which the rod (2) projects, dimensioned for coupling to a dental handpiece. Petition 870260039758, dated 04 / 29 / 2026, page 8 / 16 5 / 7 angled. At the base (3) there is at least one coupling slot (4) extended by an extension of the slot (5), which cooperate with a coupling element (13) intended for mechanical connection with the reservoir (6).

[013] The reservoir (6) defines a continuous internal cavity and is formed by a first upper section (7), of predominantly cylindrical geometry, a second tapered intermediate section (8) and a third distal section (9) which constitutes the active end of the assembly. In the third section (9) is integrated a unilateral cutting blade (10), with a cutting thickness (D) of 0.3 to 0.5 mm, arranged asymmetrically in relation to the longitudinal axis of the reservoir. Also at the distal end of the reservoir (6) is an axial centering pin (11), coaxial to the body of the instrument, whose end is blunt.

[014] The third section (9) of the reservoir further comprises an auxiliary cutting edge (14), integrated into the external geometry of the distal end. The reservoir (6) is provided with an access orifice (12) that establishes direct communication between the cutting region and the internal cavity of the reservoir, this orifice being associated with a lower access opening to the reservoir (15), formed in the region of the lower base of the reservoir (16). The lower opening (15) is structurally delimited by the base (16), integrating into the geometry of the reservoir body without the presence of additional internal components.

[015] The assembly is mounted by coupling the reservoir (6) to the lid (1), in which the engagement element (13) of the reservoir cooperates with the slot (4) and its extension (5) of the base (3), establishing a mechanical connection by rotary motion. In the assembled configuration, the rod (2), the lid (1) and the reservoir (6) align along a common axis, forming a single, continuous body, in which the internal cavity of the reservoir remains completely free. The instrument has, in the distal region, a collection radius defined by the geometry of the section (9), with a value of at least 2.5 mm, while the centering pin (11) has a diameter of 1 to 2 mm, according to the dimensional specification.

[016] During use, the drill with bone fragment collector is initially prepared by coupling the reservoir (6) to the lid (1), promoting the Petition 870260039758, dated 04 / 29 / 2026, page 9 / 16 6 / 7 engagement of the engagement element (13) in the coupling slot (4) and in its extension (5), until the formation of a rigid assembly aligned along a common axis. Then, the rotational drive rod (2) is connected to an angled dental handpiece, capable of transmitting rotation to the instrument.

[017] Before the actual collection, a pilot hole is drilled in the bone tissue using an independent guide drill, not part of the patent object. This pilot hole defines the initial point of action and serves as support for the axial centering pin (11), whose blunt end is positioned inside the previously drilled hole, ensuring axial alignment and instrument stability during the operation.

[018] With the instrument correctly positioned, rotation is activated, promoting the action of the unilateral cutting blade (10) and the auxiliary cutting edge (14) located in the third distal section (9) of the reservoir. As the bone tissue is removed, the generated fragments are guided through the access hole (12) and the lower access opening to the reservoir (15), flowing directly into the cavity defined by the reservoir (6). The continuous internal configuration of the reservoir, formed by sections (7), (8) and (9), allows for the complete storage of the collected bone fragments, without interference from internal elements.

[019] After obtaining the desired quantity of bone material, the rotation is stopped and the instrument is removed from the surgical area. Then, the reservoir (6) is detached from the lid (1) by means of reverse rotation of the assembly, releasing the engagement element (13) from the slot (4, 5). Once separated, the presence of the lower access opening to the reservoir (15) significantly facilitates the complete removal of the stored bone fragments, allowing them to be fully removed from inside the reservoir with the aid of an appropriate instrument, such as a curette or equivalent tool, enabling the total use of the collected material for subsequent use in bone grafting or plastic surgery procedures.

[020] It is important to point out that the figures and descriptions provided do not have the Petition 870260039758, dated 04 / 29 / 2026, page 10 / 16 7 / 7 The purpose of this solution is not to limit the ways in which the inventive concept now proposed can be implemented, but rather to illustrate and make understandable the conceptual innovations revealed in this solution. Therefore, the descriptions and images should be interpreted in an illustrative and not limiting manner, and other equivalent or analogous ways of implementing the inventive concept now revealed may exist, provided they do not fall outside the scope of protection outlined in the proposed solution. Petition 870260039758, dated 04 / 29 / 2026, page 11 / 16

Claims

1 / 1 CLAIM 1- DRILL WITH BONE FRAGMENT COLLECTOR, composed of a rotating drive shaft (2), a single-sided cutting blade (10) and an axial centering pin (11), and is characterized by comprising a lid (1) and a reservoir (6) interconnected with each other, wherein the lid (1) has a base (3) from which the shaft (2) projects, and has at least one coupling slot (4) extended by an extension of the slot (5), which cooperate with a coupling element (13) intended for mechanical connection with the reservoir (6); the said reservoir (6) defines a continuous internal cavity and is formed by a first upper section (7), of predominantly cylindrical geometry, a second tapered intermediate section (8) and a third distal section (9) which is integrated with the unilateral cutting blade (10), with a cutting thickness (D) of 0.3 to 0.5 mm, arranged asymmetrically in relation to the longitudinal axis of the reservoir (6);and at the distal end of the reservoir (6) is the axial centering pin (11), coaxial, whose end is blunt; the third section (9) also includes an auxiliary cutting edge (14), integrated into the external geometry of the distal end; the reservoir (6) is provided with an access hole (12) associated with a lower opening (15), formed in the region of the lower base of the reservoir (16), the lower opening (15) being structurally delimited by the base (16); and it also has, in the distal region, a collection radius defined by the geometry of section (9), of at least 2.5 mm, while the centering pin (11) has a diameter of 1 to 2 mm.; Petition 870260007521, dated 01 / 27 / 2026, page 12 / 22

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