Abstract: A coupling for the production of a releasable connection between a medical, in particular a dental, handpiece part and a supply hose and for the transmission of current and if applicable further supply media from the supply hose to the handpiece part. The coupling includes two coupling elements wherein one of the two coupling elements may be arranged on the supply hose and the other on the handpiece part. A guide element is arranged on one of the two coupling elements, which guide element can be inserted into an insertion opening formed on the other coupling element. In a certain relative rotational position of the two coupling elements a pushing element having current contacts engages into a corresponding recess of the second coupling element, wherein with inserted or at least partly inserted guide element the two coupling elements can be rotated relative to one another around an axis of rotation before attainment of the predetermined coupling position.

Abstract: In an electric motor for use in a handpiece for dentistry, dental medicine or dental technology, with a rotor held rotatably by a bearing arrangement, and a stator surrounding the rotor, a bearing arrangement has a first bearing located on an end region of the rotor, and a second bearing located on an opposite end region of the rotor, which second bearing is constructed as a movable bearing and is biased in the direction of the first bearing by a spring arrangement. The spring force of the spring arrangement within an operating region is substantially independent of the position of the movable bearing.

Abstract: A coupling for the production of a releasable connection between a medical, in particular a dental, handpiece part and a supply hose and for the transmission of current and if applicable further supply media from the supply hose to the handpiece part. The coupling includes two coupling elements wherein one of the two coupling elements may be arranged on the supply hose and the other on the handpiece part. A guide element is arranged on one of the two coupling elements, which guide element can be inserted into an insertion opening formed on the other coupling element. In a certain relative rotational position of the two coupling elements a pushing element having current contacts engages into a corresponding recess of the second coupling element, wherein with inserted or at least partly inserted guide element the two coupling elements can be rotated relative to one another around an axis of rotation before attainment of the predetermined coupling position.

Abstract: The rotor for an electric motor used with a dental handpiece has a shaft with a rotational axis and a magnet arranged around the rotational axis. A centering element may be rigidly connected to the shaft or constructed as part of the shaft. The centering element presses on the magnet from the outside to center it in relation to the rotational axis of the shaft. The centering element may be pressed or shrunk on to two balancing rings. The balancing rings can be pressed or shrunk on the shaft. This allows precise centering of the magnet with respect to the rotational axis of the shaft to be achieved. The pressure exerted by the centering element on the magnet counteracts centrifugal forces during rotor rotation. Particularly high speeds may be achieved without the surface of the magnet exceeding a critical tensile stress.

Abstract: The present invention provides compositions and methods for increasing proliferation, increasing cell cycle activity, and/or proliferation of postmitotic mammalian differentiated cardiomyocytes. The invention can be used to slow, reduce, or prevent the onset of cardiac damage caused by, for example, myocardial ischemia, hypoxia, stroke, or myocardial infarction in vivo. In addition, the methods and compositions of the invention can be used to enhance proliferation of differentiated cardiomyocytes in vitro and/or ex vivo, which can then be used in tissue grafting.

Abstract: A medical, in particular dental-medical, handpiece, having a shaft, having a forward shaft section and a rearward shaft section, which defines an obtuse angle with regard to each other, having a working head at a forward end of the forward shaft section, which is tapered towards the working head, and having a drive shaft in the shaft, which drive shaft has a forward drive shaft section and a rearward drive shaft section, which stand in drive connection with one another, the forward end of the forward drive shaft section standing in drive connection with a tool holder moveably mounted in the working head, and the forward drive shaft section being mounted in a receiving sleeve. The receiving sleeve can be screwed in, from the rear, into the forward shaft section.

Abstract: In a dental, dental-medical or dental-technical handpiece, having an elongate grip sleeve there are provided at the rearward end of the grip sleeve coupling elements for the connection of the handpiece to a supply hose to be connected with a dental supply arrangement, and there are provided at the forward end of the grip sleeve a head section with a tool receiver for mounting a tool to be put into rotation. The handpiece further has an electric motor for driving a tool held by the tool receiver, which motor is completely integrated into the grip sleeve such that grip sleeve and motor form a unit.

Abstract: In medical or dental handpiece having a treatment tool driven by means of a drive part via a transmission arrangement, the transmission arrangement contains at least two planetary transmission stages connected one after another, which each have a sun gear mounted on a drive shaft, a planetary gear carrier having a plurality of uniformly distributed planetary gears cooperating with the sun gear, and a hollow gear, fixed to a housing, surrounding the planetary gears, having an inner toothing, wherein the planetary gear carrier of at least one transmission stage serves as drive shaft and carrier of the sun gear of the following transmission stage. In order to increase the stability of the arrangement the drive shaft for each transmission stage is extended beyond the sun gear driven thereby and in that the planetary gear carrier belonging to this sun gear is arranged rotatably on the extension.

Abstract: The invention relates to a medical or dental medical handpiece (3) having an elongate shaft (13), which has in its front end region a tool holder (5) having a lateral insertion opening (5a) for a tool (6), and having a rearward and a forward shaft section (13a, 13b) which include an obtuse angle (W2) which is open to the side away from the insertion opening (5a), wherein in the shaft sections (13a, 13b) there is rotatably mounted in each case a drive shaft section (53a, 53c), which stand in driving connection with one another by means of gears meshing with one another, and wherein the forward shaft section (13b) stands in driving connection with the tool holder (5) by means of gears (58, 59) meshing with one another.

Abstract: In a medical or dental-medical handpiece having a tool, a drive mechanism for the tool has at least one rotary part mounted rotatably by means of a bearing arrangement. The bearing arrangement includes at least one ball bearing with a plurality of balls arranged between an inner track and an outer track, wherein the inner track of the ball bearing is formed by means of the end face of a first bearing part rotatable with the rotary part, and the outer track is formed by means of the end face of a second bearing part fixed in relation to the rotary part.

Abstract: A medical, in particular dental-medical, handpiece, having a shaft having a forward shaft section and a rearward shaft section, which defines an obtuse angle with regard to each other, having a working head at a forward end of the forward shaft section, which is tapered towards the working head, and having a drive shaft in the shaft, which drive shaft has a forward drive shaft section and a rearward drive shaft section, which stand in drive connection with one another, the forward end of the forward drive shaft section standing in drive connection with a tool holder moveably mounted in the working head, and the forward drive shaft section being mounted in a receiving sleeve. The receiving sleeve can be screwed in, from the rear, into the forward shaft section.

Abstract: The invention relates to a medical or dental-medical handpiece having a rotary part, in particular a turbine rotor. In order to improve the handpiece with regard to small construction, running noise and economical construction, there is provided a roller bearing for the purpose of mounting the rotary part, having at least two roller body rows arranged next to one another.

Abstract: The invention relates to a medical or dental-medical treatment which at its rearward end has a coupling element for coupling on to a matching coupling element of a flexible supply line, and in its forward region has a holder device for a tool, the handpiece being of a rearward and a forward handpiece section which are connected with one another by means of a plug-in connection and are fixed on one another by means of a latching device which has a latching arm extending approximately axis-parallel and which is transversely elastically bendable, which latching arm is arranged on the one plug-in connection part and is latched in its free end region with a latching element arranged on the other plug-in connection part . For the purpose of improving the connection between the rearward and the forward handpiece section the latching device at the same time axially fixes an insert part of the handpiece, which insert part sits in a plug-in recess of the one and/or of the other plug-in connection part.

Abstract: The invention relates to a medical or dental-medical handpiece having a rotary part which is rotatably mounted in a bearing bush by means of a roller bearing having an inner ring and an outer ring. In order to improve the handpiece with regard to an axial limiting of the roller bearing there is arranged in the inner surface of the bearing bush or in the outer surface of the outer ring a first ring groove in which there sits a securing ring which projects out of the first ring groove and bears at least with its one side on a shoulder surface of the respective radially oppositely lying part.

Abstract: A medical or dental-medical handpiece has in its forward end region a lateral insertion opening for a tool and, lying opposite to the insertion opening, a mounting opening with an insert part, which can he placed therein, and a push button which is mounted displaceably between an outer initial position and an inner release position and is biased into its initial position by a spring force. The pushbutton is supported with at least one stop arranged thereon on at least one counter stop in its intial position. The insert part is arranged sunk into the mounting opening and the pushbutton engages in the mounting opening with slight play for movement.

Abstract: In a medical or dental handpiece having a treatment tool driven by means of a drive part via a transmission arrangement, the transmission arrangement contains at least two planetary transmission stages connected one after another, which each have a sun gear mounted on a drive shaft, a planetary gear carrier having a plurality of uniformly distributed planetary gears cooperating with the sun gear, and a hollow gear, fixed to a housing, surrounding the planetary gears, having an inner toothing, wherein the planetary gear carrier of at least one transmission stage serves as drive shaft and carrier of the sun gear of the following transmission stage. In order to increase the stability of the arrangement the drive shaft for each transmission stage is extended beyond the sun gear driven thereby and in that the planetary gear carrier belonging to this sun gear is arranged rotatably on the extension.

Abstract: The invention relates to a medical or dental handpiece having an elongate shaft which in its front end section is provided with a tool holder with a lateral insertion opening for a tool, and that has a rear and a front shaft section that form an obtuse angle which is open towards the side facing away from the insertion opening. One drive shaft section each is rotatably mounted in the shaft sections and is functionally linked with intermeshing gears. The front shaft section is functionally linked with the tool holder by intermeshing gears. The aim of the invention is to make such a handpiece easier to handle. To achieve this aim, the angle formed between the center axis of the insertion opening and the center axis of the front shaft section is greater than 90° and the front gear of the front drive shaft section intermeshes with the gear of the tool holder on a side facing away from the insertion opening.