An ultrasonic dental handpiece system with rotary coupling comprising a dental handpiece and a dental handpiece tip wherein the system incorporates a swivel mechanism and dynamic fluid interface for the dental handpiece and dental handpiece tip to rotate freely relative to the dental handpiece cable thereby decoupling the handpiece from a torsion load applied to it by the handpiece cable and internal tubing and wires. The ultrasonic dental handpiece with rotary coupling generally includes a handpiece to which a piezo assembly and secondary coil are housed and a cable assembly including a primary coil and handpiece cable wherein the handpiece cable provides a supply of electrical energy and cooling lavage. The primary and secondary coils form a transformer wherein the secondary coil is inductively coupled to the primary coil with the secondary coil in electrical communication with the piezo assembly. A method of using a handpiece is also disclosed.

An indexed drive system (10) for mechanised tools, in particular an electric toothbrush, for selectively imparting various drive modes to a pair of concentrically-arranged drive shafts (12, 14) thereby imparting various brushing modes to the head (H) of the mechanised tool, in particular an electric toothbrush.

A root canal treatment instrument 100 continues drive of a cutting tool 5 in forward rotation drive until reaching 180 degrees, and when a load applied to the cutting tool 5 is equal to or greater than a reference load, drive of the cutting tool 5 is switched to reverse rotation drive until reaching 90 degrees. In the root canal treatment instrument 100, when a cumulative amount of rotation is equal to or greater than a reference amount of rotation, change to a drive pattern is made, forward rotation drive is continued until reaching 90 degrees, and when a load applied to the cutting tool 5 is equal to or greater than the reference load, drive of the cutting tool 5 is switched to reverse rotation drive until reaching 180 degrees.

The present invention relates to a device for driving an endodontic file head of an endodontic device and for operating a remote pump, the device comprising: a gear for the connection with the endodontic file head; a drive shaft for rotating the gear and for rotating at least one magnet; a first cylindrical element surrounding the drive shaft; a rotatable magnet holding means surrounding the first cylindrical element; at least one magnet fixed in the rotatable magnet holding means; a coil surrounding the rotatable magnet holding means; a second cylindrical element surrounding the coil; a central processing unit; an inner encoder on the central processing unit for measuring the velocity of the drive shaft; a transmitter; an antenna for sending a signal to a remote pump; and at least one sleeve interlinked with the drive shaft for moving the drive shaft by a motorized power handle.

An electrically driven device includes a housing, an electric motor with a drive shaft having a first rotary axis and a drive pin connected to the drive shaft eccentrically with respect to the rotary axis, and a driven shaft having a second rotary axis and mounted in the housing for performing a pivoting about the second rotary axis. The driven shaft is coupled to the drive shaft by a gear mechanism including a scotch yoke mechanism converting a rotary motion of the drive shaft into a reciprocating motion of the driven shaft. The scotch yoke mechanism includes a cross slider having a sliding support extending perpendicular to the first rotary axis and receiving the drive pin either directly or through a sliding block with a bearing receiving the drive pin. The cross slider is guided in the housing by at least two pivotable links. The driven shaft is coupled to the cross slider by an arm, converting a rotary motion of the drive shaft into a reciprocating of the driven shaft.

A coupling device for releasably connecting a handpiece to another component. One of a first coupling element and a second coupling element, is designed as a coupling cavity, into which a coupling protrusion on the other coupling element can be inserted. A positioning element is disposed on the first coupling element or the second coupling element and can be inserted into a first recess on the other coupling element to position the two coupling elements in a defined angular position about their common axis. A light source disposed in a second recess on the first or second coupling element can be coupled to an optical fiber on the other coupling element. A transfer element disposed on the first or second coupling element and inserted into a third recess on the other coupling element is configured to transfer data, signals and/or energy between the first and second coupling elements.

A torque limiting device for use with a dental drive tool including a housing defining a rotation axis and having a bore concentric with the rotation axis and a torque limiting insert. The housing has a recess for housing at least part of the torque limiting insert. The torque limiting insert includes a fixing region held within the housing and a spring region extending from the fixing region and including a locking catch protruding into the bore. The locking catch is aligned with the recess so it can be moved radially outwards into the recess in to a disengaged position. The locking catch is arranged to engage with the dental drive tool when the tool is introduced in the bore to transmit a torque applied to the housing and to deflect into the disengaged position against the force of the spring region when a predefined torque limit is reached.

A drivetrain assembly (100) for a personal care device (10), the drivetrain assembly including a primary resonator (110); a secondary resonator (140) configured to reduce vibrations transmitted from the motor to a body (12) of the personal care device; a fixed point (130) positioned between the primary resonator and the secondary resonator; a first spring member (120) connected at a first end to the primary resonator and at a second end to the fixed point; a second spring member (150) connected at a first end to the secondary resonator and at a second end to the fixed point; a coupling spring (160) connected at a first end to the primary resonator and at a second end to the secondary resonator; and an actuator (170) configured to exert force on at least one of the primary resonator and the secondary resonator.

A system and method for compensating for torque reaction forces in a medical apparatus is disclosed. The system may include a rotary element which rotates about an axis. A contra-rotating flywheel may be driven to rotate about the axis relative to the rotary element, wherein the flywheel is free to rotate and is accelerated and decelerated by a driver which is fixed to the rotary element. Contra-rotation of the flywheel may compensate for torque reaction forces when the rotary element is accelerated or decelerated.

An endodontic file system is provided for simultaneously cleaning and shaping multiple root canals, the system includes a drill head having a distal portion and a proximal portion; at least two adjustable couplers on the distal portion of the drill head, each adjustable coupler configured to secure an endodontic file for cleaning a root canal; and a rotary system configured to rotate each adjustable coupler, where at least one endodontic file has an adjustable working distance from the drill head to a root canal of a tooth. In an example, each adjustable coupler can be configured to have a torque control configured to allow for controlling the rotation of the adjustable coupler based on an amount of torque.