Patent ID: 8081069
Filing Date: 2011-12-20
Classification: A61M,G01L

Abstract:
1. A device for identifying a change in pressure of a liquid in a liquid flow path associated with a microdosing device for delivering a liquid substance via a catheter to a patient, the device comprising: a structural part having a feed opening, a removal opening, and physical entity disposed within the part such that an interior space of the part is provided that fluidically connects the feed opening to the removal opening, wherein the feed opening supplies the liquid to the interior space of the part and the removal opening supplies the liquid to the catheter when the microdosing device is operated; and measuring means which is operably coupled to the physical entity and detects a change to the physical entity due to a change in pressure of the liquid in the liquid flow path in-an optical, acoustic, inductive or capacitive manner, wherein the measuring means is configured to detect a projected surface of at least part of the physical entity or a change in the projected surface of at least part of the physical entity in a certain direction as a consequence of a change in pressure of the liquid by projection of a shadow image of at least part of the physical entity onto one of a photosensitive spot-type, linear or X-Y photosensor by a light source.