A test strip is provided for use in the determination of the concentration of an a chemical in blood. The test strip comprises a plurality of microneedles and a test area. Each microneedle is adapted to puncture skin and to draw blood. The test area is in fluid communication with the microneedles. The...http://www.google.es/patents/US6603987?utm_source=gb-gplus-sharePatente US6603987 - Hollow microneedle patch
