Abstract: The disclosure relates to a needle-guiding device for a skin pricking device, comprising a base body, a skin pricking needle (3) and a needle channel (14), which is formed in the base body and in which the skin pricking needle (3) is arranged, wherein the skin pricking needle (3) can be moved back and forth repeatedly in the needle channel (14) along a movement path, wherein a channel wall (17) of the needle channel (14) has proximal guide wall sections (18) with respect to the skin pricking needle (3), on which the skin pricking needle (3) comes to rest for the needle guidance in response to the back and forth movement, and has distal wall sections (19), which are recessed relative to the proximal guide wall sections (18) and which are free from a direct contact with the skin pricking needle (3) in response to moving the skin pricking needle (3) back and forth in the needle channel (14). A skin pricker is furthermore provided.

Abstract: The disclosure relates to a needle-guiding device for a skin pricking device, comprising a base body, a skin pricking needle (3) and a needle channel (14), which is formed in the base body and in which the skin pricking needle (3) is arranged, wherein the skin pricking needle (3) can be moved back and forth repeatedly in the needle channel (14) along a movement path, wherein a channel wall (17) of the needle channel (14) has proximal guide wall sections (18) with respect to the skin pricking needle (3), on which the skin pricking needle (3) comes to rest for the needle guidance in response to the back and forth movement, and has distal wall sections (19), which are recessed relative to the proximal guide wall sections (18) and which are free from a direct contact with the skin pricking needle (3) in response to moving the skin pricking needle (3) back and forth in the needle channel (14). A skin pricker is furthermore provided.

Abstract: A brush holder for an electrical machine, and in particular a hammer brush holder, can include a carbon brush inserted with one of its ends provided with a brush shunt into a pot-shaped receptacle part of the brush holder. The carbon brush is retained in the receptacle part by means of clamping. A reliable clamping of the carbon brush is guaranteed by providing a scraper rib on at least one side wall of the receptacle part and designing it to ascend from the entry slot of the receptacle part toward its pot-like bottom with respect to its height and/or its width pointing into the receiving space of the receptacle part. The brush holder may be manufactured from plastic, and the carbon brush is inserted with a clamp locking force fit into a receiving opening of the brush holder.