A drip chamber includes a cap that extends the field of view of a droplet in a vertical direction above the plane of the droplet, as well as horizontally in the plane of the droplet. The drip chamber has a deformable body and an interior volume to accommodate manual air purging and priming by squeezing...http://www.google.es/patents/US5906598?utm_source=gb-gplus-sharePatente US5906598 - Self-priming drip chamber with extended field of vision
Self-priming drip chamber with extended field of vision
