Needle-guiding device for a skin pricking device and skin pricking device
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.
1. A needle-guiding device for a skin pricking device ( 1 ), comprising
a base body;
a skin pricking needle ( 3 );
a needle channel ( 14 ), which is formed in the base body and in which the skin pricking needle ( 3 ) is provided, 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 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 ); and
a fluid is transported in a flowing manner in a spiral fluid transport channel running around the needle channel ( 14 ) and provided by the proximal guide wall sections ( 18 ) and the distal wall sections ( 19 ) extending completely around the skin pricking needle ( 3 ).
2. The needle-guiding device according to claim 1 , wherein the proximal guide wall sections ( 18 ) and the distal wall sections ( 19 ) are formed alternately along the movement path in the needle channel ( 14 ).
3. The needle-guiding device according to claim 1 , wherein the formation of the proximal guide wall sections ( 18 ) and of the distal wall sections ( 19 ) are limited to a partial area of a periphery of the channel wall ( 17 ) encompassing the needle channel ( 14 ).
4. The needle-guiding device according to claim 1 , wherein the proximal guide wall sections ( 18 ) and/or the distal wall sections ( 19 ) are arranged along one or a plurality of spiral lines each running around the needle channel ( 14 ) to form the spiral fluid transport channel.
5. The needle-guiding device according to claim 1 , wherein voids ( 20 ) are formed between the skin pricking needle ( 3 ) and the distal wall section ( 19 ) and are in fluid communication along the movement path and are configured to receive fluid.
6. The needle-guiding device according to claim 1 , wherein the movement path has a straight section in a straight needle channel section and/or a curved section in a curved needle channel section.
7. The needle-guiding device according to claim 1 , wherein the proximal guide wall sections ( 18 ) have a flat and/or a punctiform contact surface such that, in response to guiding the skin pricking needle ( 3 ) in the needle channel ( 14 ), said skin pricking needle forms a flat and/or a punctiform direct contact with the proximal guide wall section ( 18 ).
8. The needle-guiding device according to claim 1 , wherein the proximal guide wall sections ( 18 ) and/or the distal wall sections ( 19 ) are formed offset to one another in channel wall sections located opposite one another along the movement path.
9. The needle-guiding device according to claim 1 , wherein the needle channel ( 14 ) is connected to a fluid reservoir ( 30 ).
10. The needle-guiding device according to claim 1 , wherein an effective channel width of the needle channel ( 14 ), which is determined by a distance at right angles to the longitudinal direction of the needle channel ( 14 ) of proximal guide wall sections ( 18 ) on opposite sides of the needle channel, is larger than a thickness of the skin pricking needle ( 3 ).
11. The needle-guiding device according to claim 1 , wherein the needle channel ( 14 ) is at least partially formed in a needle nozzle ( 5 ).
12. A skin pricking device, comprising a drive module ( 7 ) and a needle module ( 6 ) coupled thereto, wherein the needle module ( 6 ) has a needle-guiding device according to claim 1 .
13. The needle-guiding device according to claim 1 , wherein the base body is designed as a disposable component with the needle channel ( 14 ).
14. The skin pricking device according to claim 12 , wherein the needle channel ( 14 ) is at least partially formed in a needle-guiding component ( 15 ) of the needle module ( 6 ).