Fluid-driven medical, especially dental, handpiece fluid-flow connector elements, and such handpieces

Abstract

A fluid-pass connector element (1) is provided for a fluid-driven medical, particularly dental, handpiece (50). The handpiece (50) comprises a head portion (51) having a rotatable impeller (52) and a coupling end (53) for connecting a fluid source. Element (1) comprises a first end face (2) facing the head portion (51), a second end face (3) facing the end (53), a body (4) extending from the first end face (2) to the second end face (3), and a number of fluid lines (5, 6, 7) passing through the body (4). Element (1) is formed as a one-piece plastic component. According to the corresponding manufacturing method, element (1) is manufactured as a one-piece plastic component by an injection molding process. Each handpiece (50) of a different set of medical fluid-driven handpieces (50) comprises a one-piece plastic element (1).

Description

Technical Field

[0001] The present invention relates to a fluid flow connector element for a fluid-driven medical, in particular dental handpiece. The connector element is intended for conveying fluid media, in particular air and water. The present invention further relates to a method for manufacturing such a fluid flow connector element, and a medical, in particular dental handpiece having such a fluid flow connector element.

Background Art

[0002] Fluid-driven medical, in particular dental handpieces comprising a plurality of tubes are known from the prior art. Through these tubes, different fluids, in particular air and water, are guided between the head part of the handpiece and the coupling end for connection to a fluid source. These tubes extend through the handpiece body which comprises a hollow outer sleeve, and are typically held in bores in a projection of the head part which projects into the outer sleeve. Such a handpiece is known, for example, from patent application EP 4 190 274 A1.

[0003] Inserting each of the individual tubes into the curved handpiece body and inserting each of the individual tubes into the corresponding bore of the projection of the head part requires high assembly effort.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The object of the present invention is therefore to provide an alternative solution for delivering a medium through a fluid-driven medical, particularly dental, handpiece. In particular, this alternative solution aims to reduce the assembly effort of a fluid-driven medical, particularly dental, handpiece, and preferably also reduce manufacturing costs. [Means for solving the problem]

[0006] According to the present invention, this problem is achieved by a fluid-flow connector element for medical, particularly dental, handpieces having the features of claim 1, a fluid-driven medical, particularly dental, handpiece according to claim 12, a set of fluid-driven medical, particularly dental, handpieces according to claim 13, the use of the same fluid-flow connector element according to claim 14, and a method for manufacturing the fluid-flow connector element according to claim 15. Particularly advantageous embodiments are described in the dependent claims.

[0007] The fluid-flow connector element according to the present invention is configured as a component of a fluid-driven medical, particularly dental, handpiece. The fluid-flow connector element comprises a first end face facing the head portion of the handpiece, a second end face facing the coupling end of the handpiece, a body extending from the first end face to the second end face, and a plurality of fluid lines extending from the first end face through the body to the second end face. The fluid-flow connector element, or the entire fluid-flow connector element having the first end face, the second end face, the body, and the plurality of fluid lines, is formed as a one-piece plastic component.

[0008] The fluid conduction connector element is therefore a separate, one-piece component that can be inserted into a fluid-driven medical, particularly dental, handpiece. Thus, the fluid conduction connector element can be attached to the handpiece in just a few assembly steps, significantly simplifying the assembly process. In particular, the fluid conduction connector element allows all fluid lines to be attached to the handpiece in a single assembly step. Furthermore, attaching a one-piece connector element to the handpiece also offers the advantage of reducing the overall weight of the handpiece.

[0009] In addition to the components of the fluid-flow connector element described above, it is noted that one or more further elements, such as positioning elements and / or tubular beads protruding from the first or second end face, as detailed below, may be formed as a single piece with the fluid-flow connector element and may be made of plastic. Such at least one additional element then becomes an integral part of the fluid-flow connector element and provides the same advantages as described in the preceding paragraph.

[0010] Fluid-flow connector elements are preferably configured for attachment to or reception on medical, particularly dental, handpieces. In particular, the fluid-flow connector element is configured to be inserted into a hollow outer sleeve of the handpiece, and / or the handpiece is configured to receive the fluid-flow connector element, particularly in the hollow outer sleeve. The handpiece, particularly the outer sleeve, preferably completely encloses or seals the fluid-flow connector element. Therefore, when the fluid-flow connector element is housed in the handpiece, no direct contact with the surroundings occurs.

[0011] Fluid-flow connector elements, particularly the body, are preferably elongated and / or preferably curved or angled, extending along a longitudinal axis. The external shape of the fluid-flow connector element, particularly the body, is preferably cylindrical, and more preferably curved or angled. However, in some embodiments, due to one or more recesses, protrusions, setbacks, undercuts, cavities, or similar geometric shapes of the body, only a section or portion of the outer surface may be formed as a cylindrical outer shell. These geometric shapes serve, for example, to allow or carry a medium, particularly a pressurized gas or compressed air, preferably the return of the pressurized gas driving the handpiece, and / or a medium line, and / or a power line, control line, and / or a signal line, and / or an optical light guide.

[0012] The first and / or second end faces are preferably circular or elliptical in shape. The outer diameter of the first and / or second end faces is preferably larger than the outer diameter of the body of the fluid-flow connector element. In particular, the first and / or second end faces can be positioned on preferably annular or elliptical extensions at each end of the body or the fluid-flow connector element. These features facilitate insertion and positioning of the fluid-flow connector element into the handpiece.

[0013] Preferably, the sealing element is provided on the first and / or second end face, particularly flat or disc-shaped sealing elements. Preferably, the sealing element is a separate component positioned on the first and / or second end face. The sealing element seals the end face interface through which the fluid medium flows into or out of the fluid-flow connector element. Preferably, one sealing element is provided on each end face to seal all fluid lines or fluid openings exiting from the first or second end face. Preferably, the first and / or second end face is provided with recesses and / or indentations into which the sealing element can be inserted and / or positioned. This ensures that the sealing element is properly positioned on the fluid-flow connector element and can be inserted into the handpiece together with the fluid-flow connector element. Thus, advantageously, assembly is further simplified.

[0014] Preferably, one-piece fluid-conducting connector elements are manufactured by injection molding and / or from injection-molded plastics. In particular, the entire one-piece fluid-conducting connector element, including a first end face, a second end face, a body, multiple fluid lines, and any additional elements of the fluid-conducting connector element, is manufactured by injection molding and / or from injection-moldtable plastics. Additional elements include positioning elements and / or tubular pieces protruding beyond the first or second end face, which are described in detail below. Surprisingly, fluid-conducting connector elements can be manufactured by injection molding with little to no post-processing required. Thus, the molded fluid-conducting connector elements can be installed virtually off the injection molding machine. Surprisingly, this results in significantly lower manufacturing and assembly costs for injection-molded fluid-conducting connector elements compared to the costs for multiple separate pipes.

[0015] Technically, it is possible to manufacture a one-piece fluid-pass connector element with all the above components and additional elements from plastic using a machining process. However, this requires numerous machining and post-processing steps, making machining manufacturing economically disadvantageous.

[0016] Suitable injection-molded plastics for manufacturing one-piece fluid-passage connector elements include thermoplastics, thermosetting plastics, or elastomeric plastics. Examples include polystyrene, polyphenylene sulfide (PPS), polyetheretherketone (PEEK), or glass fiber-reinforced plastics such as glass fiber-reinforced polyamides.

[0017] Preferably, a one-piece fluid-conducting connector element is curved along its longitudinal extension or longitudinal axis. Preferably, a one-piece fluid-conducting connector element has a bending radius along its longitudinal extension, and / or the longitudinal axis of the one-piece fluid-conducting connector element is curved. Particularly preferably, a one-piece fluid-conducting connector element is injection-molded in a curved shape along its longitudinal extension. Particularly preferably, a one-piece fluid-conducting connector element is therefore already curved along its longitudinal extension when removed from the mold. Preferably, the injection molding die for the connector element is curved along its longitudinal extension, and / or the one-piece fluid-conducting connector element is injection-molded into an injection molding die that is curved along its longitudinal extension. Similarly, at least one of the multiple fluid lines curves along its longitudinally extending portion through the body of the fluid-pass connector element and / or has a corresponding bending radius and / or is injection-molded into a curved shape. These features make it possible to manufacture one-piece fluid-pass connector elements from rigid or inflexible plastics. This is particularly advantageous when attaching the connector element to a handpiece and / or when connecting the connector element to a headpiece, for example, using a hollow screw, see below. Preferably, the bending or bending radius of the outer sleeve of the handpiece and the fluid-pass connector element correspond to each other. This allows the connector element to be received into the curved portion of the outer sleeve so as to fit. This facilitates the attachment of the connector element to the handpiece.

[0018] Alternatively, a one-piece fluid-conducting connector element is formed at an angle along its longitudinal extension or longitudinal axis. Preferably, the one-piece fluid-conducting connector element, particularly the body, comprises a first section and a second section arranged at an angle to each other. The angle is not 0°. Preferably, the angle between the first section and the second section is less than 45°, particularly less than 30°. For example, the angle is about 10° to 25°. Particularly preferably, the one-piece fluid-conducting connector element is manufactured by injection molding with the longitudinal extension already angled along it. The one-piece fluid-conducting connector element thus, particularly preferably, comprises a first section and a second section that are already angled along and / or formed at an angle to its longitudinal extension when removed from the injection molding die. Preferably, the injection mold for the connector element is angled along its longitudinal extension, and / or the one-piece fluid-flow connector element is injection molded in an injection mold that is angled along its longitudinal extension. Similarly, at least one of the multiple fluid lines is formed and / or has a corresponding angle along its longitudinal extension that passes through the body of the fluid-flow connector element, and / or is injection molded at an angle. These features make it possible to manufacture one-piece fluid-flow connector elements from rigid or inflexible plastics. This is particularly advantageous when attaching the connector element to a handpiece and / or when connecting the connector element to a headpiece, for example using a hollow screw, see below.

[0019] Alternatively, a one-piece fluid-flow connector element may be elastically deformable and be received in a sleeve portion of a medical, particularly dental, handpiece, which is curved along its longitudinal extension. Preferably, the connector element is thus deformed during and / or after installation into a curved shape along its longitudinal extension, particularly into a bent shape along its longitudinal extension. Preferably, the connector element conforms to the curvature of the curved sleeve portion. Preferably, the one-piece fluid-flow connector element is manufactured, particularly by injection molding, as an element extending linearly along its longitudinal extension or longitudinal axis. Preferably, the injection molding die for the connector element is thus linear along its longitudinal extension, and / or the one-piece fluid-flow connector element is injection molded in an injection molding die that is linear along its longitudinal extension. These features, advantageously, result in a high sealing effect at the interface with other components of the handpiece, particularly at the end face where the fluid medium enters and exits the connector element, due to the elasticity of the one-piece fluid-pass connector element. Therefore, additional sealing elements are not required.

[0020] According to one embodiment, the fluid line terminates at an opening. Preferably, at least one of these openings is formed by a tubular piece. The tubular piece protrudes beyond a first or second end face, is made of plastic, and is formed as a one-piece with the fluid-passing connector element. Preferably, the tubular piece is formed as a one-piece with the fluid-passing connector element by injection molding and / or from a plastic suitable for injection molding. Preferably, such a tubular piece forms an extension of the fluid line, particularly protruding beyond the first and / or second end faces. The extension is formed as a one-piece with the connector element and passes through it. Preferably, the cross-section of the tubular piece is rounded, for example, circular, elliptical, or kidney-shaped. By manufacturing the tubular piece as a one-piece as part of the connector element, both the manufacturing and assembly effort of the handpiece are advantageously reduced. This is because an additional, separate tubular piece is not required to connect the connector element to an adjacent component of the handpiece.

[0021] Preferably, one of the fluid lines of the connector element is provided for supplying a pressurized gas, particularly compressed air. In particular, such a pressurized gas line comprises a tubular piece having an opening. The tubular piece protrudes from the end face, is made of plastic, and is formed as a one-piece with the fluid-flow connector element. Particularly preferably, the pressurized gas line comprises such a tubular piece on a second end face facing the coupling end of the handpiece. Particularly preferably, this tubular piece provided on the second end face has a rounded cross-section, for example, circular, elliptical, or kidney-shaped, and is provided for supplying pressurized gas to drive the handpiece, particularly the impeller of the handpiece. Alternatively or additionally, the pressurized gas line comprises a further tubular piece located on the first end face. The tubular piece faces the head portion of the handpiece, protrudes from the first end face, is made of plastic, and is formed as a one-piece with the fluid-flow connector element. Preferably, this further tubular piece has a rounded cross-section, for example, circular, elliptical, or kidney-shaped. The tubular piece is preferably manufactured as a one-piece unit with the connector element by injection molding. These features advantageously facilitate the delivery of pressurized gas between the connector element and adjacent components of the handpiece. This is because the tubular piece and connector element are formed as a single piece, and there is only one interface requiring sealing at the free end of the tubular piece. (In contrast, when connecting to a separate tubular piece, two interfaces at the two free ends of the tubular piece must be sealed.)

[0022] Alternatively or additionally, the fluid-flow connector element further comprises a second fluid line for supplying a pressurized gas, particularly compressed air. Particularly preferably, this additional second fluid line is provided for supplying a cooling gas or cooling air for cooling the treatment site. Particularly preferably, at least one opening of this additional pressurized gas line is formed by a tubular piece. The tubular piece protrudes beyond the end face, is made of plastic, and is formed as one piece with the fluid-flow connector element. Particularly preferably, the cooling gas line comprises such a tubular piece on a first end face facing the head portion of the handpiece. Particularly preferably, this tubular piece provided on the first end face has a rounded cross-section, for example, circular, elliptical, or kidney-shaped. Alternatively or additionally, the cooling gas line comprises a further tubular piece. The tubular piece is located on a second end face facing the coupling end of the handpiece, protrudes from the second end face, is made of plastic, and is formed as one piece with the fluid-flow connector element. Preferably, this additional tubular piece has a rounded cross-section, such as circular, elliptical, or kidney-shaped. Preferably, the tubular piece is formed as a single piece with the connector element by injection molding. These features advantageously facilitate the delivery of pressurized gas between the connector element and adjacent components of the handpiece. This is because the tubular piece and connector element are formed as a single piece, and there is only one interface requiring sealing at the free end of the tubular piece. (In contrast, when connecting to a separate tubular piece, two interfaces at the two free ends of the tubular piece need to be sealed.)

[0023] Alternatively or additionally, the fluid-pass connector element may include a fluid line for supplying a liquid, particularly water. Particularly preferably, this fluid line is provided for supplying a liquid for cooling the treatment site. Preferably, at least one opening of this fluid line is comprised of a tubular piece. The tubular piece protrudes beyond the end face, is made of plastic, and is formed as one piece with the fluid-pass connector element. Particularly preferably, the fluid line includes such a tubular piece on a first end face facing the head portion of the handpiece. Particularly preferably, this tubular piece provided on the first end face has a rounded cross-section, for example, circular, elliptical, or kidney-shaped. Alternatively or additionally, the fluid line may include a further tubular piece. The tubular piece is located on a second end face facing the coupling end of the handpiece, protrudes from the second end face, is made of plastic, and is formed as one piece with the fluid-pass connector element. Preferably, this further tubular piece has a rounded cross-section, for example, circular, elliptical, or kidney-shaped. The tubular piece is preferably formed as a single piece with the connector element by injection molding. These features advantageously facilitate the transfer of liquid between the connector element and adjacent components of the handpiece. This is because the tubular piece and connector element are formed as a single piece, and there is only one interface requiring sealing at the free end of the tubular piece. (In contrast, when connecting to a separate tubular piece, two interfaces at the two free ends of the tubular piece must be sealed.)

[0024] Alternatively or additionally, at least one separate tubular piece for guiding fluid, which is not formed integrally with the connector element, is inserted into at least one opening of the fluid line of the connector element. Preferably, the opening is formed at the first end face or the second end face, or is formed flush with the first end face or the second end face. Preferably, the separate tubular piece is made of metal or plastic. By using the separate tubular piece, it is advantageously possible to allow greater manufacturing tolerances during the production of the fluid-flow connector element. This is because the separate tubular piece can bridge the distance between the fluid-flow connector element and the adjacent component.

[0025] Preferably, the fluid line in which the separate tubular piece is received is provided for delivering pressurized gas, in particular compressed air, for driving a handpiece, in particular an impeller of the handpiece. Optionally, the separate tubular piece is inserted into two openings at the first end face and the second end face of the pressurized gas line, or the separate tubular piece is inserted into one of the two openings at the first end face or the second end face, while the other opening at the first end face or the second end face is, as described above, provided with a plastic tubular piece that protrudes from the end face and is formed integrally with the fluid-flow connector element. It is particularly advantageous to provide the separate tubular piece and the tubular piece formed integrally with the fluid-flow connector element respectively. This is because the respective advantages, namely that the tubular piece formed integrally with the connector element has only one interface requiring sealing, and that manufacturing tolerances are reduced due to the separate tubular piece, are combined.

[0026] Alternatively or additionally, the fluid-flow element further comprises a second fluid line for delivering pressurized gas, in particular compressed air. Particularly preferably, this second fluid line is provided for delivering cooling gas or cooling air for cooling the treatment site. Optionally, a separate tubular piece is inserted into the openings of both the first end face and the second end face of the further compressed gas line, or a separate tubular piece is received in one of the two openings of the first end face or the second end face, while the other opening of the first end face or the second end face is provided with the aforementioned tubular piece, which protrudes from the end face, is made of plastic, and is formed in one piece with the fluid-flow connector element. It is particularly advantageous to provide the separate tubular piece and the tubular piece formed in one piece with the fluid-flow connector element respectively. This is because the respective advantages, namely that the tubular piece formed in one piece with the connector element has only one interface requiring sealing, and that manufacturing tolerances are reduced due to the separate tubular piece, are combined.

[0027] Alternatively or additionally, the fluid-flow connector element comprises a fluid line for delivering liquid, in particular water. Particularly preferably, this fluid line is provided for delivering liquid for cooling the treatment site. Optionally, a separate tubular piece is inserted into the openings of both the first end face and the second end face of the fluid line, or a separate tubular piece is inserted into one of the two openings of the first end face or the second end face, while the other opening of the first end face or the second end face is provided with the aforementioned tubular piece, which protrudes from the end face, is made of plastic, and is formed in one piece with the fluid-flow connector element. It is particularly advantageous to provide the separate tubular piece and the tubular piece formed in one piece with the fluid-flow connector element respectively. This is because the respective advantages, namely that the tubular piece formed in one piece with the connector element has only one interface requiring sealing, and that manufacturing tolerances are reduced due to the separate tubular piece, are combined.

[0028] Preferably, the fluid-flow connector element and at least one tubular piece formed as a single piece, and / or a separate tubular piece inserted into the opening of the connector element, are provided and configured as follows: that is, a separate tubular piece can be inserted into, or is inserted into, the opening of a handpiece component adjacent to the one-piece fluid-flow connector element. This component includes, for example, a projection on the head, a tubular line, or a coupling cylinder positioned between the coupling end of the handpiece and the connector element. The opening of the component is provided, in particular, for receiving and delivering fluid guided through the one-piece tubular piece and / or the separate tubular piece, or for delivering fluid to further transport to the one-piece tubular piece and / or the separate tubular piece and associated fluid lines. Thus, at least one one-piece tubular piece and / or the separate tubular piece are, in particular, also the fluid delivery interface portion. Conversely, the tubular piece can also be mounted on a component of the handpiece, such as on a projection on the head or on the coupling cylinder, and this tubular piece can be inserted into an opening at the first or second end face of the connector element. These features also advantageously allow for reliable fluid delivery to or from the connector element.

[0029] Preferably, the fluid-flow connector element comprises a positioning element for positioning the fluid-flow connector element in a medical, particularly dental, handpiece, especially on the inside of the outer sleeve. The positioning element advantageously facilitates the insertion of the fluid-flow connector element into the handpiece and / or connection of the fluid-flow connector element, particularly the connection of the connector element and a tubular piece formed as one piece or separately, with other components of the handpiece. The positioning element is positioned, for example, on the outer surface of the body and / or on an extension at one end of the body of the fluid-flow connector element and / or on a first or second end face. The positioning element is positioned, for example, near the opening of the fluid line of the connector element. The positioning element is positioned, for example, near the tubular piece of the fluid line of the connector element, thereby facilitating the connection of the opening or tubular piece with components of the handpiece. The positioning element is formed, for example, as an extension or projection protruding from the body. The positioning element is provided, in particular, to contact the inside of the outer sleeve of the handpiece. Preferably, the positioning element is formed complementary to the inner shape of the outer sleeve, and / or the inner shape of the outer sleeve has a shape for receiving the positioning element, particularly a shape complementary to the positioning element. This also advantageously facilitates the insertion and positioning of the fluid-flow connector element during assembly.

[0030] As described above, the positioning element is preferably formed as a one-piece with the fluid-flow connector element, and in particular is formed as a one-piece with the fluid-flow connector element by injection molding, or manufactured from a plastic suitable for injection molding. These features also advantageously eliminate the need for the step of separately manufacturing and / or assembling the positioning element.

[0031] Preferably, at least one of the multiple fluid lines of a one-piece fluid-pass connector element has an inner diameter that changes within the body of the fluid-pass connector element. Preferably, the change in inner diameter is formed during or by the injection molding process. Preferably, the inner diameter decreases in the direction from the second end face facing the coupling end to the first end face facing the head portion. Preferably, the inner diameter changes continuously within at least one section of the fluid line. Alternatively, the inner diameter changes discontinuously within at least one section of the fluid line, for example, by a step or shoulder on the wall surface of the fluid line. These features favorably influence the flow behavior of the fluid flowing through the fluid line, for example, by accelerating the flow velocity, creating a nozzle effect, and / or making the jet of fluid discharged from the fluid line more compact.

[0032] Preferably, a one-piece plastic fluid-passage connector element is provided on its outer surface with a recess for receiving a medium line and / or a medium and / or a sensor. This recess, also referred to above as a geometric shape, receives, for example, a medium line for a fluid and / or an electrical line, in particular a supply line, a control line and / or a signal line and / or an optical light guide. Alternatively or additionally, the recess may also be formed to receive and carry a medium such as a fluid, and therefore preferably as a fluid line. The recess may have, for example, a notch, a channel, a groove, a projection, a recess, an undercut, or a similar geometric shape. Preferably, the recess is manufactured as a one-piece with the connector element, particularly by injection molding. Preferably, the recess opens periphery, particularly in the inner wall of the outer sleeve. Preferably, the recess extends between a first end face and a second end face. The recess extends along all longitudinal portions of the connector element from the first end face to the second end face, or is provided in only one section of the connector element. Advantageously, the recess for receiving a medium line or medium also functions, in addition to guiding fluid in the fluid line of the connector element, to guide another medium and / or guide and / or support the medium line.

[0033] Providing such recesses, whose shape and dimensions are determined to accommodate different media lines and / or media and / or sensors according to the requirements of each handpiece, is particularly important for creating sets of different medical, especially dental, fluid-driven handpieces having the same one-piece fluid-pass connector element. Embodiments of such sets are described in detail below. Such recesses provide the flexibility necessary to manufacture different handpieces having the same fluid-pass connector element.

[0034] Preferably, the recess curves along its longitudinally extending portion or longitudinal axis. Preferably, the recess has a bending radius along its longitudinally extending portion. Preferably, the recess curves in accordance with or in the same way as a one-piece fluid-passage connector element, and in particular, the recess and body or longitudinal axis of the connector element have similar or identical bending radii. Preferably, the recess is manufactured in a curved shape, particularly by injection molding. These features allow the recess to follow the curved shape of the handpiece, particularly the outer sleeve, and thus advantageously, together with the outer sleeve, to form a medium line and / or duct for the medium.

[0035] In a particularly preferred embodiment, the recess is provided for carrying compressed air, in particular so-called exhaust air. The exhaust air flows from the head portion toward the coupling end of the handpiece after driving the impeller. Preferably, the recess is open toward the periphery, in particular toward the inner wall of the outer sleeve, and together with a section of the inner wall of the outer sleeve in particular, forms a conduit or conduit channel for the compressed air flowing toward the coupling end. Thus, the one-piece fluid-flow connector element is advantageously configured to carry the medium in various directions. Particularly preferred, one of the medium lines described in the preceding paragraph is also received in this recess to guide the compressed air. Thus, advantageously, no additional recess is required for this purpose.

[0036] The recesses for the medium lines, sensors, medium, and / or compressed air described in the preceding paragraph are provided in at least one of the following sections of the one-piece fluid-passage connector element: namely, the body, the first and / or second end faces, and at least one of the extensions at each end of the body. The recesses, and in particular the section forming the recess, are preferably manufactured as a one-piece with the connector element, especially by injection molding, or during the injection molding of the connector element, and / or from an injection-molded plastic. Thus, advantageously, there are no additional manufacturing steps required for the production of the recesses.

[0037] Preferably, the fluid-flow connector element comprises at least one opening or passage for an optical light guide. This passage is preferably formed separately from the recesses for the medium line, medium, and / or compressed air described above. This passage is provided in at least one of the following sections of the one-piece fluid-flow connector element: namely, in the body, on the first and / or second end faces, and on at least one of the extensions at each end of the body. The passage is in particular a closed shape, such as circular or elliptical, and preferably the passage completely encloses the light guide. Thus, the fluid-flow connector element also functions to securely attach the light guide to the handpiece, in particular to securely attach the light guide, which is often fragile. The passage is preferably manufactured as a one-piece with the connector element, particularly by injection molding, or during the injection molding of the connector element, and / or from an injection-molded plastic. Thus, advantageously, there are no additional manufacturing steps required for the production of the opening or passage.

[0038] According to one embodiment, a one-piece fluid-pass connector element is connected to the head of a medical, particularly dental, handpiece by a screw connection. This advantageously provides a reliable connection for supplying fluid between the fluid line of the fluid-pass connector element and the head.

[0039] Preferably, the head portion, particularly the projection of the head portion that is receivable or received by the outer sleeve, has threads. Preferably, the threads of the head portion are formed as internal threads in the holes of the head portion or projection. Preferably, a threaded screw is provided. The threaded screw is receivable in the fluid-flow connector element and in the holes of the head portion, and can be screwed into the threads of the head portion to connect the head portion to the fluid-flow connector element. Preferably, the threaded screw is received in the holes or openings of the connector element. These features also advantageously facilitate the connection of the head portion and the connector element during handpiece assembly.

[0040] Particularly preferably, the threaded screw is formed as a hollow screw having external threads on the outside. Particularly preferably, the threaded screw or hollow screw is receivable or receivable in a recess of the fluid-pass connector element described above, particularly a recess for guiding exhaust. Particularly preferably, a hole having internal threads in the head portion or projection is configured as a conduit channel for exhaust. Particularly preferably, the hole and the hollow screw screwed into the hole and positioned in the recess are formed to discharge exhaust from the head portion toward the coupling end of the handpiece. Configuring the threaded connection portion for connecting the connector element to the head portion as a conduit for exhaust is an extremely advantageous and space-saving means.

[0041] Preferably, at least one first stopper is provided on the outside of the hollow screw. Preferably, a first counter stopper is provided on the outer surface or outer shell of the fluid-passable connector element and / or on the inside of the outer sleeve of the handpiece. Preferably, the first stopper and the first counter stopper come into contact with each other when the hollow screw, connector element and head are received in the outer sleeve and the connector element and head are connected via the hollow screw. Preferably, a second stopper is provided on the outer surface or outer shell of the fluid-passable connector element, and a second counter stopper is provided on the inside of the outer sleeve of the handpiece. Preferably, the second stopper and the second counter stopper come into contact with each other when the hollow screw, connector element and head are received in the outer sleeve and the connector element and head are connected via the hollow screw. The first stopper, second stopper and counter stopper described above include, for example, projections, shoulders, annular shoulders, steps, or similar geometric shapes. By providing stoppers and counterstoppers, the connection between the head, the fluid-flow connector element, and the outer sleeve of the handpiece is stabilized, and these elements are securely positioned within the handpiece.

[0042] According to one embodiment, a fluid-driven handpiece for medical, particularly dental, use is provided, comprising the fluid-flow connector element described above. The handpiece preferably comprises a head portion to which a compressed gas-driven impeller is rotatably mounted. A tool holder for receiving a treatment tool is rotatably connected to the impeller, so that the treatment tool can be rotated. As described above, the one-piece fluid-flow connector element is configured, in particular, to supply compressed air for driving the impeller to the impeller or to the head portion. The fluid-flow connector element is also configured to supply cooling air and cooling water to the head portion and / or to the treatment tool and / or to the treatment site.

[0043] The handpiece further comprises an outer sleeve. At least a portion of the outer sleeve is configured as a grip sleeve for holding the handpiece by hand. The outer sleeve is connected to the head portion via a projection on the head portion. The projection is receivable within or on the outer sleeve. The aforementioned one-piece fluid-flow connector element is received in the outer sleeve, particularly in the region of the outer sleeve adjacent to the head portion. This region curves along the longitudinal axis or longitudinal extension. Preferably, the curvature or bending radius of the outer sleeve and the fluid-flow connector element correspond to each other. Thus, the connector element is receivable or received in the curved portion of the outer sleeve to fit into.

[0044] The end of the handpiece opposite the head is configured as a coupling end. Fluid flow ports, in particular, which connect to a fluid source supplying compressed gas and / or liquid, are provided at the coupling end. These ports may additionally include electrical conductors and / or optical conductors for transmitting electrical energy, control signals or adjustment signals, or measured values. These ports can be connected to a fluid source, or a control or adjustment device, particularly a microcontroller, via a supply hose equipped with corresponding medium conduits and electrical conductors. A one-piece fluid flow connector element is connected, in particular to the fluid flow port, to receive and transfer the medium and / or fluid supplied from the port, as described above. Preferably, one or more further fluid flow components, such as a pipe or coupling cylinder having holes for transporting fluid, are provided on the handpiece for connecting the port and the fluid flow connector element to transport fluid.

[0045] According to one embodiment, a set of different fluid-driven handpieces for medical, particularly dental, use is provided. The different handpieces are equipped with the same one-piece fluid-pass connector element as described above. According to one embodiment, different fluid-driven handpieces for medical, particularly dental, use can be manufactured by using the same one-piece fluid-pass connector element as described above.

[0046] Preferably, the different handpieces also have the same screw connection as described above, having a head portion, and in particular having the same hollow thread. Preferably, the interface between the same fluid-pass connector element and the projection of the head portion of the different handpieces is also the same, and in particular, the holes or openings on the projection of the head portion of the different handpieces for connecting to the fluid line of the fluid-pass connector element, and in particular for receiving a tubular piece, are of the same configuration and position. The same applies to the other end of the fluid-pass connector element facing the coupling end of the handpiece. Preferably, the interface between the same fluid-pass connector element and the coupling end of the different handpieces, which connects the coupling end of the handpiece to the fluid-pass connector element, is the same, and in particular, the holes or openings on the coupling cylinder of the different handpieces for connecting to the fluid line of the connector element, and in particular for receiving a tubular piece, are of the same configuration and position. Preferably, using in this manner also includes arranging the same fluid-pass connector element to connect to different handpieces by screw connection, in particular by hollow thread, as described above.

[0047] Providing and / or using the same connector element for different fluid-driven handpieces offers economic advantages, for example, by enabling the mass production of fluid-pass connector elements.

[0048] Fluid-driven handpieces differ in one or more of the following characteristics, for example: Whether or not there is a lighting device to illuminate the treatment area. The presence or absence of an optical light guide to the lighting device located within the handpiece. The presence or absence of an optical light guide to illuminate the treatment area. The presence or absence of photonic semiconductor elements, particularly LEDs, to illuminate the treatment area. Whether or not there is a sensor on the handpiece. Whether or not there is an electrical line for transmitting sensor measurements. The presence or absence of an electrical line for sending control signals or adjustment signals. The presence or absence of electronic circuits, and / or digital memory, and / or a microcontroller within the handpiece. For example, the presence or absence of wireless communication devices for transmitting data such as identification data. Such communication devices include, for example, antennas, RFID tags, or Bluetooth® devices. Differences in dimensions, particularly the external dimensions of the head and / or outer sleeve. Differences in the configuration of coupling ends, particularly the number, type, and / or arrangement of media ports and / or electrical ports at coupling ends. Differences in the required amount of drive fluid. Differences in the performance of the handpieces.

[0049] According to one embodiment, a method for manufacturing the one-piece fluid-conducting connector element described above is provided. In the method, the fluid-conducting connector element (entire) having a first end face, a second end face, a body, and a plurality of fluid lines is manufactured as a one-piece plastic component by an injection molding process and / or from an injection-molding-suitable plastic. As already mentioned several times, the manufacturing method may also include manufacturing another element, such as at least one tubular piece and / or a positioning element, as a one-piece with the fluid-conducting connector element by an injection molding process and / or from an injection-molding-suitable plastic. Furthermore, the features of the one-piece fluid-conducting connector element described above are equally applicable to the method for manufacturing the one-piece fluid-conducting connector element. Therefore, to avoid repetition, these features will be mentioned.

[0050] The present invention will be described below with reference to preferred embodiments and drawings. [Brief explanation of the drawing]

[0051] [Figure 1]This is a top view of the end face of a one-piece, fluid-passage connector element made of plastic. When the fluid-passage connector element is received by a handpiece, the end face faces the coupling end of the handpiece. [Figure 2] Figure 1 is a top view of a one-piece plastic fluid-flow connector element. When the fluid-flow connector element is received by the handpiece, its end face faces the head portion of the handpiece. [Figure 3] This is a longitudinal cross-sectional view showing a one-piece plastic fluid-passage connector element and one of the fluid lines of the fluid-passage connector element, preferably a fluid line that supplies compressed air. [Figure 4] This is a longitudinal cross-sectional view of a one-piece plastic fluid-passage connector element and two of the fluid lines of the fluid-passage connector element. [Figure 5] This is a longitudinal cross-sectional view of a plastic, alternative, one-piece fluid-passage connector element and one of the fluid lines of the fluid-passage connector element, preferably a fluid line supplying compressed air. [Figure 6] This shows a longitudinal cross-sectional view in the vertical direction, passing through a medical, particularly dental, fluid-operated handpiece equipped with a one-piece, fluid-passage connector element made of plastic. [Figure 7] Figure 6 shows a longitudinal cross-sectional view in the left-right direction, passing through the handpiece. [Modes for carrying out the invention]

[0052] Figures 1-5 show a fluid-flow connector element 1 of a fluid-driven medical, particularly dental, handpiece 50 (see Figures 6 and 7). The fluid-flow connector element 1 comprises a first end face 2 facing the head portion 51 of the handpiece 50, a second end face 3 facing the coupling end portion 53 of the handpiece 50, and a body 4 extending from the first end face 2 to the second end face 3. The fluid-flow connector element 1, particularly the body 4, extends along the longitudinal axis 19; see Figure 4. Multiple fluid lines 5, 6, and 7 extend from the first end face 2 through the body 4 to the second end face 3. As can be seen particularly from the cross-sectional views in Figures 3-5, the fluid-flow connector element 1, including the first end face 2, the second end face 3, the body 4, and the multiple fluid lines 5, 6, and 7, is constructed as a single piece. The fluid-flow connector element 1 is further manufactured by injection molding from a plastic suitable for injection molding.

[0053] Fluid lines 5, 6, and 7 are provided to guide a medium, for example, to deliver fluids such as pressurized gases and liquids, and especially preferably compressed air and water. At least some of the fluid lines 5, 6, and 7 have a varying inner diameter inside the body 4 of the fluid-pass connector element 1.

[0054] According to embodiments shown in Figures 1-5, the fluid line 5 is provided to guide compressed air from the second end face 3 to the first end face 2. A fluid-flow connector element 1, located on the handpiece 50 as shown in Figures 6 and 7, receives compressed air supplied from the coupling end 53 of the handpiece 50 and carries it toward the head portion 51 of the handpiece 50. The compressed air carried through the fluid line or compressed air line 5 is supplied, in particular, to drive the impeller 52 of the handpiece 50. The impeller 52 is rotatably supported and can be driven by the compressed air. A tool holder 56 is rotatably fixed to the impeller 52. A therapeutic tool can be inserted into the tool holder 56, thereby allowing the therapeutic tool to be rotated.

[0055] According to embodiments shown in Figures 1-5, the fluid line 6 is provided to guide compressed air from the second end face 3 to the first end face 2. The connector element 1, located on the handpiece 50 according to Figures 6 and 7, receives compressed air supplied from the coupling end 53 of the handpiece 50 and guides it through the fluid line 6 toward the head portion 51 of the handpiece 50. The compressed air delivered through the fluid line or compressed gas line 6 is supplied, in particular, to be discharged toward the treatment tool and / or treatment site attached to the handpiece 50. For this purpose, the head portion 51 is provided with a nozzle. The nozzle is connected to the fluid line 6 in a manner that delivers fluid.

[0056] According to embodiments shown in Figures 1-5, the fluid line 7 is provided to guide water from the second end face 3 to the first end face 2. A fluid-flow connector element 1 located on the handpiece 50 therefore receives water supplied from the coupling end 53 and carries it through the fluid line 7 toward the head portion 51. The water carried through the fluid line 7 is supplied to be discharged in particular toward the treatment tool and / or treatment site attached to the handpiece 50. For this purpose, the head portion 51 is provided with a nozzle. The nozzle is connected to the fluid line 7 in a manner that delivers fluid.

[0057] Of course, using fluid lines 5, 6, and 7 described in the preceding paragraph to deliver specific fluids is merely illustrative. Therefore, depending on which of the fluid lines 5, 6, and 7 is connected to which medium source, fluid lines 5, 6, and 7 are also suitable for delivering other media.

[0058] The fluid lines 5, 6, and 7 terminate at the respective openings 5A, 6A, and 7A on the first end face 2 and at the respective openings 5B, 6B, and 7B on the second end face 3. According to embodiments of Figures 1-5, the openings 5A, 5B; 6A; 7A are formed by tubular pieces 15A, 15B; 16A; 17A that protrude beyond the first end face 2 or the second end face 3. These tubular pieces 15A, 15B; 16A; 17A are formed as one piece with the fluid-passing connector element 1 and are manufactured from plastic, particularly by injection molding. Separate tubular pieces 8, for example, made of metal or plastic, are inserted into the openings 6B, 7B that terminate substantially flush or horizontally with the second end face 3, see particularly Figure 4, to guide the fluid. The one-piece or integrated tubular pieces 15A, 15B; 16A; 17A and the separately inserted tubular piece 8 are each inserted into the respective openings of the components of the handpiece 50 adjacent to the one-piece fluid-pass connector element 1. As shown in Figure 6 as an example, the tubular piece 15B of the fluid line 5 protrudes into the receptacle 58 of the coupling cylinder 57 at the second end face 3. The coupling cylinder 57 is positioned between the coupling end 53 of the handpiece 50 and the fluid-pass connector element 1. The coupling cylinder 57 is provided to deliver one or more fluids from the coupling end 53 to the fluid-pass connector element 1 via the tubular pieces 15A, 15B; 16A; 17A. Corresponding medium transfer also occurs between the tubular piece 8 at the second end face 3 and a further receptacle (not shown) of the coupling cylinder 57. Figure 7 shows the transfer of a medium from the fluid-flow connector element 1 at the first end face 2 to the projection 59 of the head portion 51 via the tubular piece 15A. The projection 59, which is received by the outer sleeve 54 of the handpiece 50, has an inlet 60 into which the tubular piece 15A is received. Corresponding medium transfer also occurs between the tubular pieces 16A;17A of the first end face 2 and a further inlet (not shown) of the projection 59.

[0059] Figures 1-4 each show a one-piece fluid-flow connector element 1. The fluid-flow connector element 1 curves along its longitudinal extension or longitudinal axis 19. The connector element 1 is injection-molded into a curved shape along its longitudinal extension. Similarly, the fluid lines 5, 6, and 7 are configured to curve along their longitudinal extension passing through the body 4 of the fluid-flow connector element 1, and are injection-molded into this curved shape. Preferably, the curvature or bending radius of the fluid lines 5, 6, and 7 and the outer sleeve 54 of the handpiece 50 are also matched to each other, so that the connector element 1 can be received into the curved portion 54A of the outer sleeve 54.

[0060] The one-piece fluid-flow connector element 1 shown in Figure 5 is constructed with an angle along its longitudinal extension or longitudinal axis. The body 4 comprises a first section 4A and a second section 4B arranged at an angle to each other. The angle is not 0°. The fluid-flow connector element 1 in Figure 5 is injection-molded at an angle along its longitudinal extension. Similarly, the fluid lines 5, 6, and 7 are also constructed at an angle along their longitudinal extensions through the body 4 of the fluid-flow connector element 1, and are angled by injection molding. The angles of the fluid-flow connector element 1 are preferably matched to the angles of the fluid lines 5, 6, and 7 and the outer sleeve 54 of the handpiece 50, so that the connector element 1 can be received into the curved portion 54A of the outer sleeve 54.

[0061] A positioning element 9 for positioning the fluid-flow connector element 1 in a medical, particularly dental, handpiece 50 is provided on the fluid-flow connector element 1; see Figures 2, 4, and 5. The positioning element 9 is made of plastic and is a one-piece unit with the fluid-flow connector element 1, manufactured particularly by injection molding. The positioning element 9 is provided on the outer surface 10 of the body 4 of the fluid-flow connector element 1, particularly on or as part of the extension 20 at one end of the body 4. The positioning element 9 is configured as a projection protruding from the body 4. The projection is provided to contact the inner wall 61 of the outer sleeve 54 of the handpiece 50, which has a shape complementary to the positioning element 9; see Figure 6.

[0062] The fluid-pass connector element 1 further has a recess 11 on its outer surface 10 for receiving a medium conduit and / or a medium and / or a sensor. The recess 11 receives, for example, a medium conduit for a fluid, and / or an electrical conductor, and / or a signal conductor, and / or an optical light guide, in particular for supply, control, and / or. Alternatively or additionally, the recess 11 receives, for example, a medium, which is a fluid. The fluid is not contained in its own line or conduit. The recess 11 further guides it. Thus, the recess 11 preferably also functions as a fluid conduit. The recess 11 comprises a notch or channel extending along the body 4, substantially along the longitudinally extending portion of the body 4, preferably between a first end face 2 and a second end face 3. The recess 11 is one piece with the connector element 1 and is manufactured in particular by injection molding. The recess 11 is open to the periphery. When the connector element 1 is received by the handpiece 50, the recess 11 and a portion of the inner wall 61 of the outer sleeve 54 form a conduit or conduit channel 62 (see Figure 6). This conduit channel 62 is provided for carrying compressed air, in particular so-called exhaust. The exhaust flows from the head portion 51 toward the coupling end 53. This compressed air does not come into a dedicated line but comes into direct contact with the outer surface 10 where the recess 11 is formed and the inner wall 61 of the outer sleeve 54. Thus, the conduit channel 62 formed by the recess 11 and the inner wall 61 forms a compressed air line. The compressed air line contains and comes into contact with compressed air. Additionally, a medium conduit, an optical light guide (see the next paragraph), and / or a sensor may be placed in the conduit channel 62.

[0063] The fluid-flow connector element 1 is provided with an opening or passage 21 for an optical light guide; see Figures 1-3. The passage 21 is constructed separately from the recess 11 described above. The passage 21 is constructed self-contained on the second end face 3 and thus reliably supports the optical light guide. The passage 21 is a one-piece with the connector element 1 and is manufactured in particular by injection molding. The opening or passage 21 is connected to the recess 11. Thus, the optical light guide can extend into the recess 11 and direct light, for example, towards the head portion 51.

[0064] The fluid-flow connector element 1 is connected to the head portion 51 of a medical, particularly dental, handpiece 50 using a screw connection 18 (see Figures 6 and 7). The screw connection 18 has a first thread 22 on the head portion 51, particularly on its projection 59 which is received by the outer sleeve 54 of the handpiece 50. The thread 22 is configured as an internal thread of the hole 23 of the projection 59. The screw connection 18 further includes a threaded screw 24. The threaded screw 24 is receivable in the fluid-flow connector element 1 and in the hole 23 of the head portion 51, and is screwable with the thread 22 of the head portion 51, connecting the head portion 51 to the fluid-flow connector element 1. For this purpose, the threaded screw 24 is received in a hole or opening 25 of the connector element 1. The opening 25 is preferably a portion of a recess 11, as shown in Figure 2, or connected to a recess 11. Therefore, the opening 25 is preferably provided to receive a threaded screw 24 and to feed the medium, similar to the case of the recess 11 described above.

[0065] The threaded screw 24 is configured as a hollow screw having an external thread 26 on its outer surface. The external thread 26 is screwed into the internal thread 22 of the projection 59. A first stopper 27 is provided on the outer surface of the hollow screw 24. A counter stopper 28A (see also Figure 2) is provided on the outer surface 10 of the fluid-flow connector element 1, and / or a first counter stopper 28B is provided on the inside or inner wall 61 of the outer sleeve 54. When the hollow screw 24, the connector element 1, and the projection 59 of the head portion 51 are received by the outer sleeve 54, and the fluid-flow connector element 1 and the head portion 51 are connected via the hollow screw 24, the first stopper 27 and the first counter stoppers 28A and / or 28B come into contact with each other. As a result, the connector element 1 is clamped and fixed between the hollow screw 24, in particular the first stopper 27, the head portion 51, and in particular the end face 63 of the projection 59 facing the connector element 1.

[0066] Preferably, the second stopper 29 is provided on the outer shell or outer surface 10 of the fluid-conducting connector element 1, and the second counter stopper 30 is provided on the inner wall 61 of the outer sleeve 54 of the handpiece 50. Preferably, when the hollow screw 24, the fluid-conducting connector element 1, and the projection 59 of the head portion 51 are received by the outer sleeve 54, and the fluid-conducting connector element 1 and the head portion 51 are connected via the hollow screw 24, the second stopper 29 and the second counter stopper 30 come into contact with each other. Alternatively, the second stopper 29 and the counter stopper 30 may be omitted, and in particular, the fluid-conducting connector element 1 may not come into contact with the inner wall 61 of the outer sleeve 54.

[0067] The threaded screw 24, configured as a hollow screw, is provided to guide a medium, in particular compressed air, preferably so-called exhaust. Exhaust refers to compressed air flowing from the impeller 52 toward the coupling end 53 of the handpiece 50. The hole 23 of the projection 59 and the hollow screw 24 form an exhaust line. The exhaust flows through the exhaust line from the impeller 52 toward the recess 11 or the conduit channel 62. The described conduit channel 62 then carries the exhaust further toward the coupling end 53.

[0068] Sealing elements are provided on the first end face 2 and / or the second end face 3, respectively. For example, such a sealing element 55 is shown on the second end face 3 in Figure 6. The sealing element 55 is a separate component located on the first end face 2 and / or the second end face 3. A recess 32 is provided on the first end face 2. The sealing element 55 can be inserted into and positioned in the recess 32. A similar recess may be provided on the second end face 3.

[0069] The one-piece fluid-pass-through connector element 1, which is received in the handpiece 50, is bent along its longitudinal extension or longitudinal axis 19 and has a bending radius along its longitudinal extension or longitudinal axis 19; see Figures 6 and 7. Thus, the connector element 1 corresponds to the connector element 1 bent along its longitudinal extension, as shown in Figures 1-4, in particular the bent and injection-molded connector element 1, which is inserted into the handpiece 50 in a bent state during assembly, as described above. Similarly, the one-piece fluid-pass-through connector element 1 has two body parts 4A, 4B that are angled along their longitudinal extension, in particular angled and injection-molded, and / or positioned at angles to each other. For example, the connector element 1 shown in Figure 5 can also be inserted into the handpiece 50.

[0070] Alternatively, the one-piece fluid-pass connector element 1, which is received by the handpiece 50 shown in Figures 6 and 7, may be elastically deformable so as to be received by the curved sleeve portion 54A of the medical, particularly dental, handpiece 50, and in particular to conform to the curvature of the curved sleeve portion 54A, as described above. Such an elastically deformable connector element 1 may be formed linearly, i.e., without a bending radius or angle, for example, after manufacturing and / or before assembly to the handpiece 50.

[0071] The coupling cylinder 57 is preferably manufactured from plastic, particularly by injection molding and / or from plastic suitable for injection molding, for example, from one of the above-mentioned plastics. Manufacturing the fluid-pass connector element 1 and the coupling cylinder 57 from plastic has the advantage of resulting in a significant reduction in the weight of the handpiece 50. The coupling cylinder 57 is provided for supplying one or more fluids from the coupling end 53 to the connector element 1. Additional components of the handpiece 50 can be optionally received and / or stored in or on the coupling cylinder 57, for example, on a recess 64. As an example, an electronic component 65 is shown in Figure 6. The electronic component includes, for example, one of the following components: namely, a circuit board 66; a sensor; an accelerometer; a gyroscope; a temperature sensor; a controller; a data memory; a wireless transmitter; a wireless receiver; an RFID tag; a radiation source; a diode, particularly a light-emitting diode; an electrical circuit for regulating electrical energy, particularly for an optoelectronic semiconductor located in the handpiece 50; a rectifier; an inverter; an electrical resistor, an electrical coil, and similar components. Wiring, such as electrical lines, signal lines, or light guides, can extend from the electronic component 65 or its components into the fluid-flow connector element 1, particularly into the recess 11 or conduit channel 62.

[0072] The embodiments described or illustrated are for illustrative purposes in particular of the present invention. Therefore, features disclosed in one embodiment are not limited to that embodiment and can be individually or in combination with one or more features of other embodiments.

Claims

1. A fluid-driven medical, particularly dental, handpiece (50) fluid-flow connector element (1), wherein the handpiece (50) comprises a head portion (51) having an impeller (52) that can be rotated by a driving fluid and connected to a tool, and a coupling end (53) for connection to a fluid source, and the fluid-flow connector element (1) is The first end face (2) facing the head portion (51), The second end face (3) facing the coupling end (53), A main body (4) extending from the first end face (2) to the second end face (3), It comprises a plurality of fluid lines (5, 6, 7) extending from the first end face (2) through the main body (4) to the second end face (3), The fluid-flow type connector element (1) is characterized in that it includes the first end face (2), the second end face (3), the main body (4), and the plurality of fluid lines (5, 6, 7), and is formed as a one-piece plastic component.

2. A fluid-flow type connector element (1) according to claim 1, The fluid-flow type connector element (1) is characterized in that it is manufactured by injection molding and / or from a plastic suitable for injection molding.

3. A fluid-flow type connector element (1) according to claim 1 or 2, The fluid-flow type connector element (1) is characterized in that it curves along its longitudinally extending portion.

4. A fluid-flow type connector element (1) according to any one of claims 1 to 3, A fluid-flow type connector element (1) characterized in that at least one of the plurality of fluid lines (5, 6, 7) curves along the longitudinally extending portion of the body (4) of the fluid-flow type connector element (1).

5. A fluid-flow type connector element (1) according to any one of claims 1 to 4, The fluid-flow type connector element (1) is characterized in that it is elastically deformable and can be received in the curved sleeve portion (54A) of the medical, particularly dental, handpiece (50).

6. A fluid-flow type connector element (1) according to any one of claims 1 to 5, The fluid lines (5, 6) terminate at openings (5A, 5B; 6A, 6B; 7A, 7B), at least one of the openings (5A, 5B; 6A, 6B; 7A, 7B) is formed by a tubular piece (15A, 15B; 16A, 16B; 17A, 17B), the tubular piece (15A, 15B; 16A, 16B; 17A, 17B) protrudes beyond the first end face (2) or the second end face (3), is made of plastic, and is formed as a one-piece with the fluid-passing connector element (1), characterized in that the

7. A fluid-flow type connector element (1) according to any one of claims 1 to 4, A fluid-passage connector element (1) characterized in that the fluid lines (5, 6, 7) terminate at openings (5A, 5B; 6A, 6B; 7A, 7B), and at least one tubular piece (8) is inserted into at least one of these openings (5A, 5B; 6A, 6B; 7A, 7B).

8. A fluid-flow type connector element (1) according to any one of claims 1 to 7, The fluid-flow type connector element (1) is characterized in that it comprises a positioning element (9) for positioning the fluid-flow type connector element (1) in the medical, particularly dental, handpiece (50), and the positioning element (9) is formed from plastic in a one-piece manner with the fluid-flow type connector element (1).

9. A fluid-flow type connector element (1) according to any one of claims 1 to 8, A fluid-flow type connector element (1) characterized in that at least one of the plurality of fluid lines (5, 6, 7) has an inner diameter that changes inside the body (4) of the fluid-flow type connector element (1).

10. A fluid-flow type connector element (1) according to any one of claims 1 to 9, The fluid-flow type connector element (1) is characterized in that it has a recess (11) on its outer surface (10) for receiving a medium line and / or a medium.

11. A fluid-flow type connector element (1) according to any one of claims 1 to 10, The fluid-flow type connector element (1) is characterized in that it is connected to the head portion (51) of the medical, particularly dental, handpiece (50) by a screw connection (18).

12. A fluid-flow type connector element (1) as described in any one of claims 1 to 11, A fluid-driven handpiece (50) for medical, especially dental, use.

13. A set of different medical, particularly dental, fluid-driven handpieces (50), A set of different medical, particularly dental, fluid-driven handpieces (50), characterized in that the different handpieces (50) each comprise an identical one-piece fluid-pass connector element (1) made of plastic, as described in any one of claims 1 to 11.

14. Use of the same one-piece fluid-pass connector element (1) according to any one of claims 1 to 11 for manufacturing different medical, particularly dental, fluid-driven handpieces (50).

15. A method for manufacturing a fluid-flow type connector element (1) according to any one of claims 1 to 11, A method characterized by manufacturing the fluid-passing connector element (1), which includes the first end face (2), the second end face (3), the main body (4), and the plurality of fluid lines (5, 6, 7), as a one-piece plastic component by an injection molding process.

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