Ergonomic dental instrument

Abstract

The invention relates to a dental suction instrument for manipulating small parts, comprising a handpiece with an internal fluid circuit, an activatable suction module configured to bring about a Venturi effect in the fluid circuit, a coupling device for connecting the suction module to a compressed-air tank, at least one removable end piece (18) connected to one end of the handpiece (12) and in communication with the fluid circuit, and at least one suction cup having a central opening removably attached to the removable end piece in order to place the central opening in communication with the fluid circuit via the removable end piece. The removable end piece has at least one ergonomic angle corresponding to an insertion axis oriented toward a location within a patient's mouth, the ergonomic angle allowing easy access to the location along the insertion axis.

Description

ERGONOMIC DENTAL INSTRUMENT - SCOPE OF INVENTION

[0001] This invention relates to the field of dental care, in particular the manipulation of small objects intended to be implanted in a patient's mouth. STATE OF THE ART

[0002] Today, in dentistry, the development of new tools requires consideration of two essential factors: safety for the patient and ergonomics for the practitioner, especially for tools intended to manipulate small dental pieces (dental prostheses, crowns, etc.) in a patient's mouth.Regarding patient safety, particularly concerning the handling and / or fixing of dental components, the availability of a reliable and easy-to-handle tool allows for: - easier disinfection, cleaning and preparation of the dental component, - relaxation of the practitioner's hand regardless of its size and morphology, - a reduction in the risk of losing the manipulated dental component in the patient's mouth and thus generating a risk of choking, - a reduction in the number of necessary steps, allowing for a shorter intervention time and limiting the concentration time required by the practitioner.

[0003] Regarding practitioner ergonomics, it is important to keep in mind that musculoskeletal disorders (MSDs) are extremely common among dentists. Numerous studies show that the prevalence of MSDs in dentists varies between 63% and 93%, primarily affecting the back, neck, and shoulders. These disorders mainly result from prolonged and repetitive postures adopted during dental procedures, often in ergonomically unfavorable positions. Between 50% and 65% of dentists report lower back pain. This area is particularly stressed due to the bent and static postures that practitioners frequently adopt. Between 48% and 72% of practitioners suffer from pain. Cervical pain. Repetitive movements and prolonged forward head tilting to improve visibility in the patient's oral cavity are the main causes of this pain. Shoulder pain affects between 40% and 60% of dentists. Awkward postures and repeated raising of the arms above shoulder level are the main causes.

[0004] Given that musculoskeletal disorders (MSDs) are a major cause of suffering and disability among dentists (affecting not only quality of life but also professional longevity), it is essential to work towards reducing them. One existing solution is the creation of a "work bubble." This "work bubble" is a space 30 to 40 cm in diameter around the practitioner in which all necessary tools must be easily accessible. This minimizes repetitive movements and stretching, thus helping to prevent MSDs. Properly designed workspaces reduce unnecessary movements and maintain a neutral posture, minimizing the risk of muscle fatigue and pain.

[0005] To ensure optimal ergonomics and prevent musculoskeletal disorders (MSDs), the ideal working position for a practitioner varies depending on whether the practitioner is right-handed (R) or left-handed (L): - for a right-handed person, the recommended position is between 11 o'clock and 12 o'clock relative to the patient's head, - for a left-handed person, the recommended position is between 12 o'clock and 1 o'clock relative to the patient's head. Maintaining this position is crucial to minimize muscle strain and thus reduce the risk of MSDs.

[0006] Referring to Figure 7b, we observe that the workstation of a practitioner (right-handed practitioner D, left-handed practitioner L) must be organized according to the type of dental chair 102 used. Different positions of the work surface 100 can be considered: - position 1: work surface 103 above the patient, - position 2: work surface 103 to the left of the patient, - position 3: work surface 103 to the right of the patient, - position 4: work surface 103 behind the patient. All these positions must respect the "work bubble" of 30cm to 40cm around the practitioner D, G, in order to limit movements and prevent MSDs.

[0007] In current dental practice, there is a need for a small parts manipulation instrument that improves the ergonomics and safety of these manipulations.

[0008] The objective of the present invention is therefore to provide a tool for handling small parts that improves the ergonomics and safety of these operations. SUMMARY

[0009] The present invention thus relates to a dental suction instrument configured for manipulating small parts, said instrument comprising: - a handpiece extending along an elongation axis X, said handpiece comprising an internal fluidic circuit, - an activatable suction module comprising a pump connected to the fluidic circuit, said suction module being configured to induce a Venturi effect inside the fluidic circuit after activation, - a coupling device configured to connect the suction module to a compressed air reservoir and a power source, - at least one removable hollow tip, configured to be connected to one end of the handpiece and made in fluidic communication with the fluidic circuit.- at least one suction cup with a central opening, configured to be removably attached to the removable nozzle in order to connect the central opening to the fluid circuit via the removable nozzle.

[0010] The removable tip has at least one predetermined ergonomic angle corresponding to a predetermined insertion axis, said predetermined insertion axis being oriented towards a predetermined location inside a patient's mouth, said predetermined ergonomic angle allowing easy access to the corresponding predetermined location by following the corresponding predetermined insertion axis.

[0011] The proposed solution achieves the aforementioned objective. Specifically, this dental suction instrument generates a vacuum, enabling the controlled and safe manipulation of small parts, both inside and outside a patient's mouth, using a gripping system that adapts to the shape of each dental component and its required position within the patient's mouth. This technology can be extended beyond dentistry, particularly to dental technicians.

[0012] The dental suction instrument according to the present invention may comprise one or more of the following features, taken separately or in combination: - at least one predetermined ergonomic angle is between 30° and 180°, - each removable tip having a predetermined ergonomic angle distinct from the ergonomic angles of the other removable tips, - the dental suction instrument comprises at least seven hollow removable tips, a first removable tip with an ergonomic angle of 30°, a second removable tip with an ergonomic angle of 60°, a third removable tip with an ergonomic angle of 90°, a fourth removable tip with an ergonomic angle of 110°, a fifth removable tip with an ergonomic angle of 130°, a sixth removable tip with an ergonomic angle of 150°, a seventh removable tip with an ergonomic angle of 150°.- at least one removable nozzle has several free ends, each intended to receive a suction cup, for example four, each free end having a distinct ergonomic angle, - at least one removable nozzle is deformable and can be deformed to present a plurality of predetermined ergonomic angles, - at least one removable nozzle is configured to be screwed onto a threaded hole on a distal end of the handpiece, - the suction module comprises a one-piece structure, the one-piece structure comprising at least one cavity opening at two points and at least two components among a solenoid valve, the pump, a compressed air circuit, and a, The filters are mounted on the monobloc structure so as to be pneumatically connected via the cavity, i.e., without using a flexible tube or added fitting; the suction module includes an evacuation circuit connecting an outlet of a Venturi cartridge and an outlet of the housing; the evacuation circuit includes a flow reducer configured to slow the airflow exiting the Venturi cartridge; the suction module is configured to be integrated into a dental chair; the suction module is configured to be activated by an activation button integrated into a dental chair; the dental suction instrument further includes an activatable vibration module, configured to vibrate the removable tip; at least one suction cup is deformable; the fluidic circuit, the pumping module, the removable tip, and the suction cup are configured to allow the application of a suction force ranging from 1 mN to 100 mN.- The internal fluidic circuit of the handpiece has a diameter ranging from 1 mm to 6 mm, and the activatable suction module is connected to the fluidic circuit by means of a cord with a diameter ranging from 2 mm to 8 mm, - the handpiece has a length of between 10 and 20 cm along the X-axis, - the coupling device is configured to connect the suction module to a power source, - the power source is self-contained, - the handpiece is equipped with a light source configured to illuminate a distal end of the removable tip.

[0013] The present invention also relates to a dental suction kit comprising: - a dental suction instrument according to any one of the preceding characteristics, and - a dental chair. DESCRIPTION OF THE FIGURES

[0014] The invention will be better understood, and other objects, details, features, and advantages thereof will become more apparent upon reading the following detailed explanatory description of embodiments of the invention given by way of purely illustrative and non-limiting examples, with reference to the accompanying schematic drawings. In these drawings: - Figures 1a and 1b are each a perspective view of an embodiment of a handpiece according to the invention; - Figure 1c is a longitudinal sectional view of the handpiece according to the embodiment of Figure 1b; - Figure 2 is a series of six perspective views of six embodiments of a removable tip according to the present invention; - Figures 3a and 3b are perspective views of different suction cups according to the present invention; - Figure 4a is a perspective view of a removable tip according to the embodiment mounted on a handpiece according to the present invention.- Figure 4b is a longitudinal cross-sectional view of a removable tip according to the embodiment of Figures 1b and 1c mounted on a handpiece according to the present invention. - Figures 5a and 5b are schematic views of two embodiments of the present invention. - Figure 6a illustrates a perspective view of an instrument according to the present invention. - Figure 6b illustrates a partial cross-section of a suction module of the instrument of Figure 6a, comprising a one-piece structure. - Figure 6c illustrates another partial cross-section of a suction module of the instrument of Figure 6a, illustrating a flow restrictor of the one-piece structure. - Figure 7a is a perspective view of an instrument according to the present invention mounted on a dental chair. - Figure 7b is a schematic top view of a "working bubble". - Figure 8 is a schematic frontal view of a human dentition with a functional cutout providing a schematic view of the different working areas with which the present invention can interact. - Figures 9a and 9b are perspective views of various prosthetic dental components shown with different points of contact with the suction cup of the instrument according to the invention. - Figure 10 illustrates a removable tip with several free ends. DETAILED DESCRIPTION

[0015] As can be seen in figures 1 to 6, the present invention relates to a dental suction instrument 10 configured to handle small parts, for example dental prostheses.

[0016] The dental suction instrument 10 comprises: - a handpiece 12 extending along an elongation axis X, - a suction module 14 including a user-activated pump 24, - a coupling device 16 configured to connect the suction module 14 to a compressed air reservoir (or source) 100 and a power source 101, - at least one removable hollow tip 18 configured to be connected to one end of the handpiece 12 and to be in fluidic communication with the suction module 14, - at least one suction cup 20 having a central opening. Handpiece

[0017] The handpiece 12 has an elongated shape, similar to that of a manipulator pen commonly used in dentistry (see Figures 1a and 1b). The handpiece 12 has a distal (front) end 12A for connection to the removable tip 18, a central (middle) portion 12B for the practitioner's grip, and a distal (rear) end 12C for connection to the compressed air reservoir (source) 100. More specifically, the distal end 12C is connected to the suction module 14, which is itself connected to the compressed air source 100. It features an ergonomic grip to ensure ease of use for the practitioner. In particular, the handpiece 12 has a shape similar to a pen. Preferably, the handpiece 12 has rounded edges, corners, and surfaces, allowing for improved ergonomics and grip. Soft materials and slightly sticky surface finishes to prevent slipping can be added to the surface. In terms of dimensions, the handpiece 12 has a length of 10 to 20 cm along the X-axis. It has an external diameter of 8 to 25 mm and an internal diameter of 1 to 6 mm. Preferably, the proximal end 12C has a smaller diameter than the central portion 12B. The proximal end 12C preferably has a diameter of 11 to 13 mm. This narrowing of the diameter on the proximal end 12C of the handpiece 12 allows a connection without an annoying border to the suction module 14 (and therefore to the compressed air source 100).

[0018] As seen in Figures 1a, 1b, 1c and 4b, the distal end 12A of the handpiece 12 is configured to be connected to the removable tip 18. More specifically, the distal end 12A may include a fastening system 19 configured to fix a watertight connector 18A of the removable tip 18. In the embodiment shown in Figure 1a, the fastening system 19 has a series of holes for receiving a series of complementary tabs of the watertight connector 18A of the removable tip 18 (see Figures 2d, e, f) so as to connect the removable tip 18 by clipping. In the embodiment of figures 1b, 1c and 4b, the fastening system 19 includes a thread intended to cooperate with a screw thread (see figure 2a, b, c) of the waterproof connector 18A of the removable nozzle 18. This waterproof connector 18A has a circular groove intended to accommodate an O-ring for sealing the removable nozzle 18.In this embodiment, the tapping preferably has a diameter smaller than that of the central part 12B of the handpiece 12 so as to allow a removable tip 18 to be screwed on, having a diameter similar to that of the central part 12B of the handpiece 12 to ensure good ergonomic continuity while leaving room for the sealing gasket of the removable tip 18.

[0019] In terms of materials, the handpiece 12 is preferably made of easily sterilizable and robust materials such as metal because it is necessary to be able to transmit significant thrust forces.

[0020] The handpiece 12 also includes an internal fluidic circuit 22 configured to allow the circulation of a fluid, preferably air. The internal fluidic circuit 22 of the handpiece 12 has a diameter ranging from 1 to 6 mm. As shown in Figures 1c and 4b, this internal fluidic circuit 22 can take the form of a straight conduit extending along the X-axis. Module

[0021] The suction module 14 includes a housing 15 in which are located all the elements enabling the generation of the Venturi effect of the dental suction instrument 10. The housing 15 has a general disc shape with an external diameter ranging from 100 to 160mm and a thickness ranging from 40 to 60mm.

[0022] The suction module 14 connects the internal fluidic circuit 22 of the handpiece 12 with the compressed air source 100 by means of a compressed air circuit. The suction module 14 of the present invention operates on the principle of the Venturi effect.

[0023] In summary, the Venturi effect is based on the principle of pressure reduction induced by accelerating airflow through a narrowed duct. This negative pressure creates effective suction, particularly useful for handling small parts.

[0024] More specifically, the pump 24 of the suction module 14 generates a vacuum using the compressed air supplied by the compressed air tank 100. By way of abuse of language, it can be considered that the suction module 14 includes a pump 24 connected to the internal fluidic circuit 22 of the handpiece 12.

[0025] In one embodiment, the pump 24 comprises at least two fluidic conduits A and B (a first positive pressure fluidic conduit A and a second negative pressure fluidic conduit B, thus forming the suction line) connected perpendicularly to each other, forming a right angle. The compressed air source 100 is connected to the first conduit A to inject air which flows towards an outlet. By the Venturi effect, this airflow in the first conduit A (positive pressure) generates a vacuum in the second conduit B (negative pressure). This second conduit B of the suction module 14 is connected to the internal fluidic circuit 22, and the generated vacuum creates a suction effect. the end of the internal fluidic circuit 22 of the handpiece 12. This positive pressure from the compressed air source 100 is thus transformed into suction by the Venturi effect. The suction module 14 therefore effectively acts as a vacuum pump, generating a stable vacuum in the internal fluidic circuit 22 via the Venturi effect, thanks to the compressed air reservoir 100.

[0026] The suction module 14 is therefore configured to induce a Venturi effect within the internal fluidic circuit 22 of the handpiece 12 after activation of the pump 24 (for example, by opening a solenoid valve 25 separating the first and second conduits B of the suction module, see below, or by opening a solenoid valve 25 that opens the positive pressure conduit). Other embodiments of Venturi systems exist and can be used interchangeably in the suction module 14.

[0027] The compressed air tank 100 can be located a considerable distance from the suction module 14, for example, in another room. This embodiment has the advantage of moving the compressor away from the treatment room. Indeed, compressors generate noise and vibrations. Therefore, moving the compressor away from the treatment room provides benefits in terms of working comfort for the practitioner and in terms of stability when handling small parts, such as plates or veneers.

[0028] Pressure drop, as is well known, is the difference in pressure between two points in a system. It is primarily due to friction or resistance to fluid flow against the walls of pipes, fittings, or obstructions such as valves. Pressure drop thus depends on the fluid velocity, its nature, and the pipe geometry. The distance between the compressed air reservoir 100 and the suction module 14 does not significantly impact the effect produced and eliminates the vibrations and noise generated by the compressed air source 100. The suction module 14 according to the present invention generates a certain vacuum, and each percentage point loss in pressure drop reduces the efficiency of the dental suction instrument 10. It is therefore crucial to maintain a minimal pressure drop.

[0029] Thus, the Venturi effect provides two technical advantages: - No noise pollution because the compressed air source 100 can be located remotely, particularly in a separate room. - Since the vacuum is generated close to the handpiece 12, the distance to be traveled, which could generate pressure losses, is reduced. - No unwanted vibration on the handpiece 12.

[0030] Preferably, the suction module 14 includes at least one sound attenuation system. In the embodiments illustrated in Figures 6b and 6c, the suction module 14 includes at least one noise reduction system. This noise reduction system may include a silencer 27 and / or a flow restrictor 30, of the baffle, bend, or elbow type. The idea is to slow down the air exiting the Venturi cartridge or the silencer 27 and lower its pressure to atmospheric pressure before it exits the suction module 14 through a dedicated air outlet. This configuration reduces the flow velocity and, consequently, the generated noise level. Figure 6b illustrates bends as flow restrictors 30.Figure 6c illustrates a baffle in which the flow F exiting the silencer 27 is first directed towards an upper part 14A of the suction module 14, before being redirected to a lower part 14B, closed by a mesh finally allowing the evacuation of the air flow F. These two embodiments can of course be combined within the same suction module 14.

[0031] The force range generated by the dental suction instrument 10 is between 0.1 and 3 N. According to a particular embodiment, considering a contact surface of 5 mm in diameter (suction cup 20) and a maximum negative pressure of -856.92 mbar, a force of 1.68 N is obtained. The minimum value obtained during tests carried out with different embodiments of the dental suction instrument 10 device is 1.09 N.

[0032] The pump 24 of the suction module 14 can be specifically adapted to achieve this Venturi effect. Examples include the Piab VGS 3010, the SMC ZL112, and the Schmalz SCPS: it has been empirically determined that the dental suction instrument 10 functions at a vacuum level of 80% (i.e., -0.8 bar). An upper limit of 85% (-0.85 bar) has also been empirically determined, as has been the case for a lower limit of 75%. Below this, the dental suction instrument 10 functions less effectively, there is less sealing and retention of the toothpiece on the suction cup 20. The pump 24 is thus configured to generate a sufficiently powerful Venturi effect despite the constraints related to the dental suction instrument 10 according to the present invention: - need for a high vacuum, between -500mbar and -900mbar, - need for a high flow rate, between 14 and 25 L / min, - maintenance of a compact size for the handpiece 12.

[0033] Thanks to its Venturi effect operation, the dental suction instrument 10 according to the present invention is designed to operate in medical environments, tolerating humidity in the event of accidental fluid aspiration. Indeed, since the pump 24 has no motor or electronic components, in the event of accidental aspiration of saliva (for example) or another liquid, the mechanism of the pump 24 is protected, and the risk of the mechanism being compromised and its operation impaired is reduced (for example, corrosion or the creation of additional stress is avoided).

[0034] In order to further secure the suction module 14 against any intrusion of moisture (in particular saliva), the suction module 14 preferably includes a filter 32 connected between the second conduit B of the suction module 14 and the fluidic circuit 22 of the handpiece 12.

[0035] In a first embodiment not shown, the suction module 14 has a two-stage configuration. As is known per se, the various elements composing the suction module 14 are connected to each other by pipes and are advantageously distributed on two stages within the housing 15 in order to limit its diameter.

[0036] In a second embodiment illustrated in Figures 6b and 6c, the suction module 14 has a monobloc structure. The monobloc structure can be manufactured by 3D printing or by machining.

[0037] This monobloc structure allows for optimal homogenization of the cross-sections of all fluid conduits and eliminates the various connections and branches typically found in a fluid circuit. Removing the tubes and fittings usually used in pneumatic systems significantly reduces pressure losses. The fluid conduits have a diameter between 2 mm and 8 mm, preferably 4 mm. In this embodiment, the fluid circuits have homogeneous internal cross-sections that are as straight as possible to maintain constant pressure and flow rate, ensuring efficient flow and vacuum levels for safely handling prosthetic components. According to tests, the monobloc embodiment offers 30% better performance compared to the non-monobloc embodiment.

[0038] The monobloc structure is defined by the fact that at least two components—the solenoid valve 25, the pump 24, the compressed air circuit, and the filter 32—are connected without the use of a flexible tube or added fitting. That is to say, at least two of the aforementioned components are directly connected by a cavity within a single monobloc piece. Preferably, each of the components—the solenoid valve 25, the pump 24, the compressed air circuit, and the filter 32—is connected without the use of a flexible tube or added fitting. More specifically, in this embodiment, the housing 15 forms a base, and each component of the suction module 14 clips or screws into a dedicated location in the base. This allows for easy maintenance, upgrades, or replacement of a defective component. Connection between handpiece and suction module

[0039] The connection between the pump 24 of the suction module 14 and the internal fluid circuit 22 of the handpiece 12 is preferably made using a cord 26 with a diameter ranging from 1 mm to 6 mm, preferably 4 mm. More specifically, the cord consists of a 1 to 6 mm diameter 80A PVC pipe, two 28AWG / 30AWG electrical cables, and a 7 to 8 mm wide medical-grade silicone sheath. The advantage of the reduced diameters (in the internal fluid circuit 22 and the cord 26) is a smaller total volume and therefore a faster vacuum is achieved. (related to the Venturi effect to be induced). Cord 26 is preferably made of medical silicone or polyurethane for maximum flexibility and durability.

[0040] In some embodiments, the dental suction instrument 10 is equipped with an air control and saving system (such as ASC or AES). This is an intelligent vacuum management function. The air control and saving system shuts off when a vacuum level of 80% is reached, for example. This limits / minimizes the air and energy consumption of the compressed air source 100 and the current source 101. This intelligent fluid management in the internal fluid circuit 22 limits energy and compressed air consumption as soon as a sufficient vacuum level is reached. This is a vacuum level control system.

[0041] In some embodiments, the module is configured to exert pressure on the toothpiece, typically used at the end of the procedure to facilitate separation between the toothpiece and the suction cup. More specifically, the pump 24 includes a Venturi bypass that allows a slight positive pressure to be introduced into the internal fluidic circuit 22 and thus into the suction cup 20.

[0042] In some embodiments, the suction module 14 includes a pressure management module 28. The pressure management module 28 intelligently maintains a predetermined vacuum level. More precisely, it is a vacuum level control system that allows the pump 24 to be switched on / off (activating or deactivating the Venturi effect) without the dentist needing to manually activate / deactivate the pump 24 (the suction module 14). In this embodiment, after activation of the suction module 14, the vacuum inside the internal fluid circuit 22 rises to a predetermined negative pressure value (generally between 80 and 84%), and the suction module 14 deactivates. It reactivates as soon as the vacuum drops to 78% and then rises again, and so on. This saves air, and therefore energy, and reduces noise. Venturi effect activation and optional dentistry seat

[0043] The pressure management module 28 can be directly integrated into a dental chair 102. In an alternative embodiment, the pressure management module 28 can be integrated into a drawer, placed on a work surface, or attached to the dental chair 102 in a removable manner. In another embodiment, the pressure management module 28 is a portable, battery-powered module with a reserve that can be supplied either with interchangeable compressed air cylinders or with an internal pressure module in the handpiece 12, which can be recharged by simply connecting it to a quick-connect fitting on the compressor 100. This allows the handpiece 12 to be recharged with compressed air in a few seconds.

[0044] As already mentioned above, the Venturi effect (the suction module 14) is activated or deactivated via the solenoid valve 25, which is controlled by a foot pedal or by a manual button integrated into the handpiece 12. More specifically, the suction module 14 is configured to be activated by an activation button which can take several forms: - it can be integrated into the dental chair 102, - it can be a remote foot pedal, - it can be a button on the handpiece, and / or - it can be a remote button in another hand.

[0045] In some embodiments, the suction module 14 is configured to be activated by an activation button integrated into a dental chair 102. As seen in Figure 7a, in some embodiments, the entire suction module 14 is configured to be integrated into a dental chair 102.

[0046] In embodiments including a dental chair 102, the dental suction instrument 10 according to the invention is preferably part of a dental kit also including a dental chair 102. of

[0047] The coupling device 16 has compact dimensions, allowing it to be stored in a drawer or on a dental chair. The coupling device 16 is configured to connect the suction module 14 to a power source (power supply). electrical) from 12 to 24V. In some embodiments, the power source is a mains power supply, and in other embodiments, the power source is a self-contained power source, for example, a battery, particularly a rechargeable one. This version allows for greater flexibility and mobility, suitable for environments requiring frequent movement.

[0048] To maximize safety, the dental suction instrument 10 features a well-defined arrangement of fluidic conduits and electrical circuitry of the suction module 14 and the handpiece 12 to ensure their complete separation.

[0049] Furthermore, the electrical circuits are isolated from their environment, in order to protect them from any entry of moisture and to allow the sterilization of the dental suction instrument 10. More specifically, the electrical circuits and the fluidic conduits are arranged in separate and sealed pipes.

[0050] The coupling module 16 is also configured to connect the suction module 14 to a compressed air source 100 operating at 3.5 bar to 7 bar. This type of compressed air source 100 is standard in modern dental practices. This compatibility ensures that the dental suction instrument 10 according to the present invention is compatible with existing installations in dental practices and operates reliably within them.

[0051] To ensure a reliable connection between the compressed air source 100 and the power source 101, the coupling module 16 features several quick-connect fittings that facilitate connection and make installation simple and intuitive for end users. Removable nozzle

[0052] As illustrated in Figures 2 and 4 and already mentioned, the dental suction instrument 10 according to the present invention comprises at least one hollow, removable tip 18, configured to be connected to one end of the handpiece 12 and made to communicate fluidically with its internal fluidic circuit 22. In the present application, the term "hollow" refers to the fact that the removable tip 18 is hollow and forms a tubular conduit.

[0053] This removable tip 18 has the dual function of allowing the safe and comfortable manipulation of a dental component (see descriptions below) and of allowing interaction with a tooth to fix the dental component to it. Each removable tip 18 must withstand at least 200 N of thrust along a principal axis (defined with respect to a direction D of a distal end of the removable tip 18). Each removable tip 18 is therefore preferably made of metal. Each removable tip 18 is configured to be either screwed directly onto the distal end 12A of the handpiece 12 (see Figure 2a, b, c) or fixed by means of a quarter-turn clip system (see Figure 2d, e, f). This type of connection provides high robustness. This type of connection also allows the removable tip 18 to be securely clamped against the distal end 12A of the handpiece 12.As can be seen in Figure 2, each removable tip 18 has its own dimensions, said dimensions being able to vary from one removable tip to another 18. Each removable tip has a length between 3 and 7 cm, preferably 4 cm and a diameter between 4 and 15 mm.

[0054] As shown in Figures 2, 4a, and 4b, the removable tip 18 has at least one predetermined ergonomic angle A with the elongation axis X of the handpiece 12. This ergonomic angle A corresponds to a predetermined insertion axis I oriented towards a predetermined location E inside the patient's mouth. This location E depends on the position of the targeted tooth and its location on the targeted tooth.

[0055] More specifically, in humans, each tooth has several surfaces (considered here as working areas), each surface potentially accommodating a position E. Among the surfaces that a human tooth can have, we can list: - mesial surface: the face of the tooth oriented towards the center of the dental arch (towards the midline), - distal surface: the face of the tooth oriented towards the back of the dental arch, opposite the midline, - occlusal surface: the upper surface of the posterior teeth (premolars and molars) used for chewing, - incisal surface: the cutting edge of the anterior teeth (incisors and canines). - vestibular surface: external surface of the anterior and posterior teeth, oriented towards the lips or cheek, depending on the type of tooth, - lingual surface: internal surface of the lower teeth, oriented towards the tongue, - palatal surface: internal surface of the upper teeth, oriented towards the palate, - proximal surface: surface oriented towards the adjacent tooth in the dental arch (includes the mesial and distal surfaces), - interradicular surface: space between the roots of multi-rooted teeth (generally molars), - labial surface: external surface of the anterior teeth (incisors and canines), oriented towards the lips, - buccal surface: external surface of the posterior teeth (premolars and molars), oriented towards the cheek, - oral surface: general term designating the internal surfaces of the teeth oriented towards the oral cavity (includes the lingual and palatal surfaces), - cervical surface: surface located at the neck of the tooth, near the gum.

[0056] Figure 8 illustrates the challenges of manipulating small parts for a dentist based on a given location E. This figure shows all the possible locations E that a dentist might encounter. Each tooth surface (mesial, distal, palatal, vestibular, etc.) can be treated independently or together. Consequently, depending on the surface(s) being treated, aligning with the insertion axis I (corresponding to a given location E) to insert a custom-made prosthetic part can be tedious. This figure gives an idea of ​​the precision required and the importance of a reliable system to prevent loss of the part and reduce the risk of inhalation or ingestion of the prosthesis by the patient.

[0057] The predetermined ergonomic angle A thus allows easy access to the corresponding predetermined location E. This access is facilitated precisely because it allows following the corresponding predetermined insertion axis I.

[0058] At least one predetermined ergonomic angle A is between 30° and 180°. In a first embodiment, at least one removable tip 18 is deformable and can be deformed to adopt any predetermined ergonomic angle A. In another embodiment, the dental suction instrument 10 comprises several removable tips 18. A first category of removable tips 18, referred to as "simple," has a single free end intended to receive a suction cup 20. In this category, each removable tip 18 has a predetermined ergonomic angle A distinct from the ergonomic angles of the other removable tips 18.More specifically, the dental suction instrument 10 can include at least seven removable tips 18 referred to as simple: - a first removable tip with an ergonomic angle A1 of 30°, - a second removable tip 18 with an ergonomic angle A2 of 60°, - a third removable tip 18 with an ergonomic angle A3 of 90°, - a fourth removable tip 18 with an ergonomic angle A4 of 110°, - a fifth removable tip 18 with an ergonomic angle A5 of 130°, - a sixth removable tip 18 with an ergonomic angle A6 of 150°, - a seventh removable tip 18 with an ergonomic angle A7 of 180°.

[0059] In an alternative embodiment illustrated in Figure 10, the dental instrument 10 comprises at least one removable tip 18, referred to as a "complex" tip, having at least four free ends (preferably four, six, or ten free ends), each designed to receive a suction cup 20. Each of the free ends has its own ergonomic angle, distinct from that of the other free ends. This embodiment is particularly suitable for handling large parts.

[0060] Thus, the removable tip 18 is adjustable to each situation and facilitates work in the mouth without altering the practitioner's ideal position. Each removable tip 18 allows the practitioner to manipulate any dental piece from all angles, respecting both the insertion axis of the dental piece and their field of vision. Figures 9a and 9b, which are non-exhaustive clinical cases, illustrate this concept. Figure 9a shows an occlusal-distal inlay, an occlusal-mesial inlay, and a veneer. Figure 9b shows a crown and an inlay core. As illustrated in Figure 8, each of these pieces corresponds to a precise area of ​​the dentition and therefore to a specific location E. Figures 9a and 9b show that, regardless of the piece and the insertion axis I The dental suction instrument 10 according to the present invention allows the workpiece to be grasped and / or held in several ways at multiple contact points, thanks to the numerous possible combinations between the different removable tips 18 and suction cups 20. The dental suction instrument 10 according to the present invention thus allows the optimal combination to be selected based on the insertion axis I, the practitioner's field of vision, and their muscular comfort. Suction Cups

[0061] As shown in Figures 3a and 3b, each suction cup 20 has a central opening O designed to make contact with the dental part to be manipulated. The central opening O has a wide rim providing sufficient contact surface to ensure a good connection and therefore a good seal between the suction cup 20 and the dental part being manipulated. Each suction cup 20 is further configured to be removably attached to the removable tip 18 in order to connect the central opening O to the fluidic circuit 22 via the removable tip 18. The vacuum resulting from the Venturi effect generated (among other things) by the suction module 14 propagates from the tip of the dental suction instrument 10 into the central opening O of the suction cup 20. Preferably, each suction cup 20 is deformable. This allows for good adaptation to the various shapes of the small parts to be manipulated.This also allows for easy changing of the suction cup 20 between patients, as each suction cup 20 is for single use only and is contaminated after use on a patient.

[0062] As is known, the suction force of a suction cup is determined by the negative pressure difference (the vacuum) multiplied by the active surface area of ​​the suction cup. Each suction cup 20 according to the present invention is configured to exert a suction force ranging from 1 mN to 100 mN on the parts to be handled.

[0063] More specifically, the suction cup is configured to allow a suction force to be exerted between 1mN and 100mN for an upstream vacuum of 80%.

[0064] Some suction cups 20 may have a bellows shape. Alternatively, other suction cups 20 have cylindrical shapes.

[0065] The compatibility of the connectors between each suction cup 20, each removable tip 18, and the handpiece 12 is essential to ensure the airtight seal of the dental suction instrument 10 according to the present invention and to guarantee precise and efficient handling of small parts (or dental parts). Vibration module and light source

[0066] In some embodiments, the dental suction instrument 10 further includes an activatable vibration module which, once activated, vibrates the removable tip 18 to facilitate the insertion of the dental piece into the patient's mouth and to optimize the wetting (increase the fluidity) of the bonding material (bonding resin or cement). More specifically, when bonding a dental piece, the adhesive may be rigid, but when vibration is applied, the adhesive becomes more fluid (thixotropic effect), which facilitates the placement of the prosthetic piece in position E. In some embodiments, the handpiece 12 is equipped with a light source configured to illuminate the removable tip 18 and the suction cup 20. Such a light source can be of two types: - UV light source - comfort light source. UV light

[0067] This light is dedicated exclusively to the polymerization of the adhesive, once the prosthetic piece is correctly positioned in location E. The handpiece 12 can thus be equipped with a UV light source to illuminate a distal end of the removable tip 18, allowing the dental piece to be bonded directly to the handpiece 12. Indeed, as is common knowledge among dental professionals, the adhesive used in dentistry requires UV light to activate its cross-linking and thus harden and set. This is the blue light one sees in a dentist's office. Comfort light

[0068] This light, in turn, increases the practitioner's visibility inside the patient's mouth. The light source, in this case, is preferably equipped with an orange filter to avoid interfering with the polymerization of the adhesive. Alternatively, the orange filter can be replaced with a True Light filter, which emits white light. White light is more comfortable for working as it allows better visibility, even if it interferes with the polymerization of the glue, offering a shorter working window for the practitioner to properly position the prosthetic piece in location E.

Claims

CLAIMS 1. A dental suction instrument (10) configured for manipulating small parts, said dental suction instrument (10) comprising: - a handpiece (12) extending along an elongation axis X, said handpiece (12) comprising an internal fluidic circuit (22), - an activatable suction module (14) comprising a pump (24) connected to the fluidic circuit (22), said suction module (14) being configured to induce a vacuum by Venturi effect inside the fluidic circuit (22) after activation, - a coupling device (16) configured to connect the suction module (14) to a compressed air reservoir (100) and to a power source (101), - at least one removable hollow tip (18), configured to be connected to one end of the handpiece (12) and made fluidic with the fluidic circuit (22),- at least one suction cup (20) having a central opening (O) and configured to be removably attached to the removable nozzle (18) in order to connect the central opening (O) to the fluidic circuit (22) via the removable nozzle (18), characterized in that the removable nozzle (18) has at least one predetermined ergonomic angle (A) corresponding to a predetermined insertion axis (I), said predetermined insertion axis (I) being oriented towards a predetermined location (E) inside a patient's mouth, said predetermined ergonomic angle (A) allowing easy access to the corresponding predetermined location (E) by following the corresponding predetermined insertion axis (I).

2. Dental suction instrument (10) according to the preceding claim,characterized in that at least one predetermined ergonomic angle (A) is between 30° and 180°.

3. Dental suction instrument (10) according to any one of the preceding claims, comprising several removable tips (18), each removable tip (18) having a predetermined ergonomic angle (A) distinct from the ergonomic angles (A) of the other removable tips.

4. Dental suction instrument (10) according to the preceding claim, comprising at least seven hollow removable tips (18), a first removable tip (18) with an ergonomic angle (A1) of 30°, a second removable tip (18) with an ergonomic angle (A2) of 60°, a third removable tip (18) with an ergonomic angle (A3) of 90°, a fourth removable tip (18) with an ergonomic angle (A4) of 110°, a fifth removable tip (18) with an ergonomic angle (A5) of 130°, a sixth removable tip (18) with an ergonomic angle (A6) of 150°, a seventh removable tip with an ergonomic angle (A7) of 180°.

5. Dental suction instrument (10) according to any one of the preceding claims, characterized in that at least one removable tip (18) has at least four free ends, each intended to receive a suction cup (20), each free end having a distinct ergonomic angle (A). 6.A dental suction instrument (10) according to any one of the preceding claims, characterized in that at least one removable tip (18) is deformable and can be deformed to present a plurality of predetermined ergonomic angles (A).

7. A dental suction instrument (10) according to any one of the preceding claims, characterized in that the suction module (14) comprises a one-piece structure, the one-piece structure comprising at least one cavity opening at two points, and at least two components from a solenoid valve (25), the pump (24), a compressed air circuit (23), and a filter (32) are mounted on the one-piece structure so as to be pneumatically connected via the cavity.

8. A dental suction instrument (10) according to any one of the preceding claims, characterized in that the suction module (14) is configured to be integrated into a dental chair (102). 9.Dental suction instrument (10) according to any one of the claims, characterized in that the suction module (14) is configured to be activated by an activation button integrated into a dental chair (102).

10. A dental suction instrument (10) according to any one of the preceding claims, characterized in that the dental suction instrument (10) further comprises an activatable vibration module configured to vibrate the removable tip (18).

11. A dental suction instrument (10) according to any one of the preceding claims, characterized in that the suction module (14) comprises a discharge circuit connecting an outlet of a Venturi cartridge and an outlet of the housing (15), and the discharge circuit comprises a flow restrictor (30) configured to slow down the airflow exiting the Venturi cartridge. 12.A dental suction instrument (10) according to any one of the preceding claims, characterized in that: - the internal fluidic circuit (22) of the handpiece has a diameter ranging from 1 mm to 6 mm, and - the activatable suction module (14) is connected to the fluidic circuit by means of a cord (26) having a diameter ranging from 2 mm to 8 mm.

13. A dental suction instrument (10) according to any one of the preceding claims, characterized in that the handpiece (12) has a length of between 10 and 20 cm along the X-axis.

14. A dental suction instrument (10) according to any one of the preceding claims, characterized in that the handpiece (12) is provided with a light source configured to illuminate a distal end of the removable tip (18).

15. Dental suction kit comprising: - a dental suction instrument (10) according to any one of the preceding claims, and - a dental chair (102).

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