Patent ID: 9308306
Filing Date: 2016-04-12
CPC Classification: A61B,A61M,G01N

Claim Text:
1. A blood chamber for use in a hemodialysis system operable to monitor at least one blood constituent, the blood chamber comprising a body defining an internal volume for receiving blood to be monitored by the hemodialysis system, the body including: a first wall, disposed on a light inlet side of the body, configured to pass light from a light source into the internal volume; a second wall, disposed on a light outlet side of the body, configured to pass the light from the light source out of the internal volume towards light sensors; wherein the blood chamber provides a first optical path extending through the body for the light from the light source, the first optical path orthogonally traversing a region of the first wall, passing through a section of the internal volume that has a first thickness extending from the first wall to the second wall, and orthogonally traversing a section of the second wall; wherein the blood chamber further provides a second optical path extending through the body for the light from the light source, the second optical path orthogonally traversing another region of the first wall, passing through a section of the internal volume that has a second thickness extending from the first wall to the second wall, and orthogonally traversing another region of the second wall, wherein the second thickness is substantially greater than the first thickness and the first and second optical paths are disposed at an angle; wherein the region of the first wall that is traversed by the first optical path is disposed at a non-zero angle γ to the region of the first wall that is traversed by the second optical path, and wherein the region of the second wall that is traversed by the first optical path is disposed at the non-zero angle γ to the region of the second wall that is traversed by the second optical path; and wherein the first and second optical paths are disposed on either side of an axis through the light source and pass through the internal volume where blood flows through the blood chamber.