Shrouded sensor clip assembly and blood chamber for an optical blood monitoring system

摘要

An optical blood monitoring system for blocking unwanted light from reaching sensors in a sensor clip assembly fastened to a blood chamber connected in an extracorporeal blood treatment system. The blood chamber has an internal flow cavity for communicating the extracorporeal blood flow and viewing windows to enable the sensor clip assembly to illuminate the blood with light as the blood flows through the blood chamber in order to monitor characteristics of the blood. The sensor clip assembly includes opposing heads with LED emitters and photodetectors. In one embodiment, lenses in the heads are surrounded by shrouds extending from the lenses so that when the sensor clip assembly is fastened to the blood chamber the shrouds block unwanted light from reaching the photodetectors. Either alternatively or as a complement to the shrouds, the blood chamber includes an opaque portion or a portion colored to attenuate particular wavelengths of light to further enhance the overall ability of the blood chamber and sensor clip assembly to block unwanted light from reaching the photodetectors.

主权项

1. A blood chamber for use in a system for monitoring extracorporeal blood flow, the blood chamber comprising:
an inlet, an outlet and an internal blood flow cavity; a main body made of a material having an opaque color, the opaque color of the material being configured to attenuate ducting of light through the main body; and a clear first lens and a clear second lens, wherein the first and second lenses are constructed as mirror images of one another, and wherein the first lens is disposed in a recess on the first side of the main body and the second lens is disposed to a second recess on the second side of the main body; wherein the internal blood flow cavity is disposed within a space within the main body between the first and second lenses; wherein the blood chamber further comprises: an anti-rotation tab for preventing rotation of a sensor clip assembly attached to the blood chamber relative to the blood chamber, wherein the anti-rotation tab extends inwardly from a peripheral wall of at least one of the first and second lenses.