Abstract: The invention provides a marker whose position in a cavity inside of a living organism can be determined, in particular for detecting local passage speeds of the marker through the gastro-intestinal tract, preferably in the small intestinal tract. The object of the invention is to provide a marker whose magnetization can be reversed with relatively low field intensities. To that end, the marker consists of a first substantially spherical part which contains a magnetizable material and is surrounded on all sides by a second part which is provided with a substantially spherical receptacle adapted to the surface shape of the first part, the receptacle being filled with a low-viscosity fluid.

Abstract: A method for photoablation in the field of dermatological medicine and to an arrangement for carrying out this method is disclosed in which the laser radiation and the outlet channel for the laser radiation are directed to a portion of skin to be treated during the treatment and the outlet opening is positioned near the treatment area. In this method, the area to be treated is subjected to a suction vacuum during treatment over its entire extent. In particular, the outlet opening communicates with a device for generating a vacuum.

Abstract: The invention concerns a method and an arrangement for determining the position of a marker in an organic cavity, in particular for establishing local passage speeds within the framework of the medical diagnosis of the stomach-bowel tract. The object of the invention is to provide a solution which ensures position-determining accuracy of greater than 1 cm in all three co-ordinate directions and permits position-determining times of 10 seconds and less in each case. According to the invention, this object is achieved in that at least one coil is acted upon in a time interval in a pulsed manner by current whose sign changes in each case between two current pulses, when the primary magnetic field, of the coil, produced thereby has died out to sufficiently low values. The secondary magnetic field generated by a marker is measured separately at least once by anisotropic magnetic field sensors parallel and perpendicular to the coil axis.

Abstract: In order to render possible the ablation to different depths in a process for correcting the shape of a lens in which the surface of the lens is acted upon by the radiation of a pulsed radiation source through a shutter in specific regions exposed by the shutter and thereby removing material from the lens by the radiation effect during the impingement of each radiation pulse, wherein the radiation is concentrated in a bundle of rays, the cross section of which is smaller when striking the lens surface than that of the lens surface exposed by the shutter, and wherein the bundle of rays is moved such that the entire lens surface exposed by the shutter is irradiated by radiation pulses consecutively impinging on the lens surface, it is suggested that the bundle of rays is moved between successive radiation pulses only to such an extent that the regions of the lens surface struck by the radiation pulses consecutively impinging on the lens surface partially overlap.

Abstract: A device designed for generating a laser beam having a homogenized cross section has the following features:a) a pulsed solid-state laser with an emission in a wavelength range of between 2 and 3 .mu.m,b) a pulse energy of between 100 .mu.J and 1 J,c) a transmission fiber made of a material transparent to the wavelength and having a length of at least 0.2 m and a diameter of between 50 and 1000 .mu.m,d) an end piece made of quartz or sapphire and having a length of between 4 and 50 mm, the end piece following the fiber and having plane end surfaces arrange perpendicular to the longitudinal direction.

Abstract: In a device for raster-stereographic measurement of body surfaces, preferably of irregularly shaped objects, in which a raster pattern having a plurality of raster lines is projected onto the surface according to the method of raster stereography by a raster projector and a line image which is distorted by the surface shape is recorded by means of a camera which forms a stereo base with the raster projector, the raster pattern having periodically recurring, particularly emphasized lines, where the order number of the lines can be deduced from the regular recurrence of these particularly emphasized lines, the raster pattern which is projected onto the surface contains locally modulated raster lines, wherein at least adjacent raster lines are clearly distinguished from one another.