Abstract: The device for closing openings or cavities in blood vessels, e.g. in veins or in the heart, said device comprises a closing body comprising an outer side having a partial region arranged for blood flow therealong at least in a part of said partial region thereof when said closing body is in its state of use for closing said opening or cavity. Furthermore, the device comprises at least one layer (16) of biostable nonwoven fiber material, which at least within a partial surface of said partial region of said outer side of the closing body is at least partially in abutment on the closing body.

Abstract: The invention relates to a structure having fibers which are adhesively bonded to one another in locations and have a permeability for air of between 0.5 ml/min*cm2 and 1.5 ml/min*cm2, wherein said structure has an at least one-sided coating which reduces the permeability of the structure to below 0.2 ml/min*cm2.

Abstract: The invention relates to a structure having fibres which are adhesively bonded to one another in locations and have a permeability for air of between 0.5 ml/min*cm2 and 1.5 ml/min*cm2, wherein said structure has an at least one-sided coating which reduces the permeability of the structure to below 0.2 ml/min*cm2.

Abstract: At the pivotable needle protector (1) according to the invention, the needle (2) is enveloped by a protective tube (3) with a slit on the side and pivotable around a hinge (5), the hinge (5) of the protective tube (3) is connected to an appendix (4) fixed on the part of the needle (2) toward the syringe, in the inside of the protective tube (3) there are valve elements (6) on both sides farthering from the slit (7), functioning as check valve regarding the movement of the needle (2). The solution is characterized by that, before the check valve at least one more valve is formed in the protective tube (3) in direct connection with the needle (2) when moving, preventing only the two-way movement of the needle (2) with the help of one or more flexible valve membranes (8) protruding from the wall of the protective tube (3).

Abstract: The device for closing openings or cavities in blood vessels, e.g. in veins or in the heart, said device comprises a closing body comprising an outer side having a partial region arranged for blood flow therealong at least in a part of said partial region thereof when said closing body is in its state of use for closing said opening or cavity.

Abstract: The device for placement in a hollow organ, in particular for holding open the hollow organ, comprises a placement body (12) having an inner side and an outer side (14). The device further comprises at least one layer (16) of biostable random-fiber fleece material arranged on said placement body (12) and being at least partially in abutment thereon.

Abstract: The invention relates to a novel covering layer for electrophotographic printing rollers with improved scratch resistance. Said covering layer consists of between 50 and 75 wt. % of cycloaliphatic epoxides, between 20 and 60 wt. % of aminofunctional silica nanoparticles, and between 0 and 2 wt. % of perfluoroalkyltrialkoxysilanes. The aminofunctional nanoparticles are produced from aminoalkyltrialkoxysilanes preferably by means of sol/gel technology.

Abstract: The subject of the invention is a pivotable needle protector serving as a protector against injuries while using hypodermic needles. At the pivotable needle protector (1) according to the invention, the needle (2) is enveloped by a protective tube (3) with a slit on the side and pivotable around a hinge (5), the hinge (5) of the protective tube (3) is connected to an appendix (4) fixed on the part of the needle (2) toward the syringe, in the inside of the protective tube (3) there are valve elements (6) on both sides farthering from the slit (7), functioning as check valve regarding the movement of the needle (2). The solution is characterized by that, before the check valve at least one more valve is formed in the protective tube (3) in direct connection with the needle (2) when moving, preventing only the two-way movement of the needle (2) with the help of one or more flexible valve membranes (8) protruding from the wall of the protective tube (3).

Abstract: The invention relates to a novel covering layer for electrophotographic printing rollers with improved scratch resistance. Said covering layer consists of between 50 and 75 wt. % of cycloaliphatic epoxides, between 20 and 60 wt. % of aminofunctional silica nanoparticles, and between 0 and 2 wt. % of perfluoroalkyltrialkoxysilanes. The aminofunctional nanoparticles are produced from aminoalkyltrialkoxysilanes preferably by means of sol/gel technology.

Abstract: The invention concerns a process for sampling disperse material flows in which an analysis substream is extracted from a process mainstream for subsequent analysis. According to the invention, the analysis substream is removed from the process mainstream via an extraction area. The extraction area is smaller than the process substream cross section and defined independently of this. The extraction area travels along an orbital curve across the process mainstream cross section during the removal of the analysis substream. The invention also relates to an apparatus for performing the process according to the invention.

Abstract: Apparatus for determination of particle sizes and/or distributions of particle sizes comprises a light source which radiates parallel light of high coherence through a measuring zone (14) in which the particles to be measured are disposed. The light beam diffracted at the particles is imaged by an imaging device (18) onto a photo-detector (20) which is coupled to an evaluating unit (22). The imaging device (18) is provided with several different focal lengths which can be selectably brought into the beam path of the overall device. At the start of a measuring process a control device causes the distribution of particle sizes initially to be determined with the use of the longest focal length and employment of evaluation mathematics valid for this focal length.

Abstract: For the determination of fine particle size distributions by scattered light measurements, an assembly of suspended particles is illuminated with coherent light, the scattered light pattern is focused on a light sensitive multi-element detector of a registration device and is transformed there to electrical signals. From the digitized electrical signals, the particle size distribution is computed with a computer. For the simplification of the setup and for the improvement of the accuracy of the computable particle size distribution, it is provided that the registration device is a video camera and that the particle size distribution is computed via the solution of a Fredholm integral equation from the signals produced by the light intensities at the pixels of the video camera. The video camera is a CCD camera.