A vibration-transmitting medical tool-coupling device includes a first coupling element and a second coupling element, wherein one of the two coupling elements is designed as a coupling protrusion which can be inserted into a coupling recess on the other coupling element, wherein the coupling protrusion and the coupling recess each have a first section having a thread with at least one thread flight for releasable connection of the two coupling elements and one second section which is designed so that the two coupling elements can be positioned relative to one another and are displaceable along the shared longitudinal axis before the two coupling elements can be connected releasably to one another by the thread. A guide ring which extends around the coupling protrusion is provided on one end of the thread which is arranged on the coupling protrusion and the at least one thread flight of the thread ends at this guide ring.

A laser irradiation tip has a main body and a tip end portion. The main body is connected with a handpiece and irradiating therapeutic laser with high absorbability in water. The tip end portion being connected with the main body. The main body of the laser irradiation tip has an optical fiber for guiding the therapeutic laser, a water flow path, and an air flow path in a parallel manner. The tip end portion of the laser irradiation tip has a connection portion with the main body, a water guide path communicated with the water flow path of the main body, an air guide path communicated with the air flow path of the main body, a fiber guide portion capable of inserting a tip side portion of the optical fiber, and a mixing chamber of water and air.

A head assembly for a dental contra-angle hand-piece and a dental contra-angle hand-piece are provided. The head assembly includes a hand-piece main body, a reversing valve movably connected to the hand-piece main body, and an inner water tube connected to the hand-piece main body, wherein the hand-piece main body is provided with a first flow channel and a second flow channel independent from each other, the first flow channel is configured to be in communication with a liquid outlet of a motor, and the second flow channel is configured to be in communication with an external pipeline; the reversing valve is provided with a confluence channel, the reversing valve is configured to enable, when moving relative to the hand-piece main body, the first flow channel and the second flow channel to alternatively be in communication with the inner water pipe through the confluence channel.

An assembly with a handpiece assembly configured to receive electromagnetic energy and fluid, and to selectively deliver the electromagnetic energy and/or the fluid to a target surface. The handpiece assembly includes a handpiece housing and a plurality of fluid lines extending through the handpiece housing. The plurality of fluid lines can transfer fluid from a proximal end of the handpiece assembly to a distal end of the handpiece assembly. A spray mixer can be positioned at the distal end that is coupled to fluid lines of the plurality of fluid lines. An air input port can be positioned at the proximal end that is configured to be coupled to an auxiliary air hose, and an air delivery channel can be coupled to the air input port, and can supply air to a tip of an exchangeable applicator that can be coupled to the distal end of the handpiece housing.

A dental handpiece includes: a head including a holder configured to hold a cutting tool, a tool rotation mechanism configured to rotate the cutting tool, a housing including the holder and the tool rotation mechanism, and a cooling passage formed in a side wall of the housing; and a grip including a first air supply passage configured to supply first air for cooling the tool rotation mechanism, and a second air supply passage connected to the cooling passage and configured to supply the head with second air lower in flow rate than the first air. The head is joined to the grip such that, of an angle formed between a rotation axis of the cutting tool and a major axis of a coupling portion of the grip which is coupled to the head, an angle on a cutting edge side of the cutting tool is an obtuse angle.

A flow-driven dental instrument, including a grip part, a head part, a media line, and a fastening device, wherein the grip part is constructed in the form of a sleeve with two ends and a media connection is disposed on the first end. At the second end, the head part projects at least partially into the grip part. A first end of the media line is connected to the head part and the media line extends from the head part through the grip part to the media connection. The fastening device includes a sleeve having an external thread and a nut having an internal thread, wherein the sleeve is connected to the outer wall of the media line in a material-locking manner and, at least in a direction toward the head part, the nut is held in the grip part in a fixed position.

A dental handpiece system includes a dental handpiece for operating a dental burr and providing a stream of water to the dental burr for cooling a tooth being acted upon by the dental burr. The dental handpiece further includes a flush water port for providing a flush water stream that is directed away from the dental burr to allow the dentist to flush a work site in a patient's mouth. The dental handpiece can also include an air outlet for providing a stream of air that is also not directed to the dental burr and that can be used to dry other dental instruments as well as work sites in the patient's mouth.

A method of preventing suckback of a dental handpiece and a dental handpiece system having a bypass injection structure are capable of effectively blocking a suckback phenomenon that occurs at the moment a rotating impeller stops. The method of preventing suckback includes bypassing air pumped from an air pump in a state where a flow path of an air supply pipe is blocked at the moment the impeller stops rotating and halts inside a head casing and injecting the air into the head casing through an air discharge pipe to block the suckback phenomenon.

Provided is an air turbine type dental handpiece capable of reducing a generated sound volume. An air turbine 2 is rotationally driven by compressed air that is supplied to the internal space of a housing 11, and the treatment such as cutting of the tooth of a patient is performed by a cutting tool 4. A blade 22 is a toroidal type blade (a blade having a shape in which a first blade portion 221 and a second blade portion 222 are continuous with each other at a bridge portion 224). Therefore, the generation of a large eddy current around the air turbine 2 is suppressed, and the generated sound volume is reduced.

A dental handpiece includes a head portion supporting a turbine for a removable rotating dental tool, and a handle portion having an internal cavity. One or more conduits extend at least partially through the internal cavity toward the head portion. At least one of the conduits is a drive fluid tube delivering drive fluid to the head portion for rotating the turbine. A wireless communication device within the internal cavity is attached to at least one of the conduits. At least a section of the handle portion surrounding the wireless communication device is formed of a dielectric material. The wireless communication device is configured to wirelessly communicate with an external reader or writer and store data related to at identification, use, and/or maintenance of the handpiece. An electrically inert substrate material encapsulates the wireless communication device, which is electrically isolated from other components of the handpiece.