A lancet assembly for pricking a person's skin for the purpose of causing a drop of blood to seep out, which can be collected and analyzed. The lance assembly comprises a housing and spring means carrying a lancet blade in the housing. The spring means has a non-linear characteristics, so that when the...http://www.google.de/patents/US5439473?utm_source=gb-gplus-sharePatent US5439473 - Safety lancet
