Patent ID: 9138134
Filing Date: 2015-09-22
Classification: A61B

Abstract:
1. Medical apparatus, comprising: an endoscope, comprising an insertion tube, having a proximal end and a distal end, which is configured for insertion into a body cavity of a subject, and containing a working channel, which conveys a liquid from the proximal end to a target region in the body cavity adjacent to the distal end; a fluid sensor, contained in the distal end of the endoscope, which measures a rate of flow of the liquid in the working channel; and a control unit which is configured to regulate the flow of the liquid in the working channel responsively to the measured rate of flow; wherein the working channel has a segment adjacent to the distal end of the endoscope that is narrowed, a converging segment proximal to the narrowed segment, and a diverging segment distal to the narrowed segment, thus defining a Venturi tube; wherein the diameter of the converging segment narrows from about 2.5 times greater than the diameter of the narrowed segment to about the same diameter as the narrowed segment; wherein the diameter of the diverging segment expands from about the same diameter as the narrowed segment to about 3 times greater than the diameter of the narrowed segment; and the liquid exits the working channel in a divergent cone to irrigate the entire target region such that it clears blood and/or debris.