Sampling system for sample fluid
The invention generally relates to a sampling system for sample liquid having a support, a lancing element arranged thereon and a semi-open channel for the capillary transport of the sample liquid from the lancing element to a collecting site on the support. A receiving structure is provided for receiving excess sample liquid escaping from the side of the channel.
1 . A microsampler for sampling a body liquid, the microsampler comprising:
a support;
a lancing element arranged on the support;
a semi-open channel for the capillary transport of the sample liquid from the lancing element to a collecting site;
a receiving structure arranged on the support for retaining excess body liquid escaping from the side of the channel.
2 . The microsampler of claim 1 , wherein the receiving structure is effective as a capillary for the body liquid in an entry area on the channel side.
3 . The microsampler of claim 1 , wherein the capillary transport capacity for the body liquid is larger in the direction of the channel than in the branch direction of the receiving structure.
4 . The microsampler of claim 1 , wherein the receiving structure is arranged on the support at a section of the channel downstream of the lancing element and upstream of the collecting site with respect to the flow direction.
5 . The microsampler of claim 1 , wherein the lancing element sticks out as a tip on a shaft member of the support and that the receiving structure is arranged in the area of the shaft member.
6 . The microsampler of claim 1 , wherein the receiving structure is formed by a cover element arranged on the support while keeping free a capillary gap towards the channel.
7 . The microsampler of claim 6 , wherein the capillary gap has a lower capillary attraction for the body liquid than the adjoining section of channel.
8 . The microsampler of claim 1 , wherein the receiving structure is formed by at least one semi-open overflow capillary which is arranged next to the side of the channel on the support.
9 . The microsampler of claim 8 , wherein two overflow capillaries are arranged symmetrically to one another on both sides of the channel.
10 . The microsampler of claim 8 , wherein at least one overflow capillary can have at least one branch.
11 . The microsampler of claim 10 , wherein the at least one branch has a smaller flow cross-section than the adjoining overflow capillary.
12 . The microsampler of claim 8 , wherein the channel is separated from the at least one overflow capillary by a side wall, where excess body liquid overflows into the overflow capillary over the side wall.
13 . The microsampler of claim 12 , the channel is fluidically connected to the at least one overflow capillary by a capillary branch.
14 . The microsampler of claim 1 , wherein the receiving structure at the same time forms a reservoir for refilling the channel.
15 . The microsampler of claim 1 , wherein the lancing element is formed on a flat shaped part being the support and that the channel has a linear grooved shape.
16 . The microsampler of claim 1 , wherein the support and the lancing element are formed as one piece from a flat material by photochemical mask etching.