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US 4,598,733 AGranted
Apparatus for detecting the volume of blood in a blood reservoir
AssigneeTerumo Kabushiki Kaisha
InventorsMichio Kanno, Atsuhiko Nogawa
Life of this patent
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Abstract
In combination with a blood reservoir, a blood volume detecting apparatus is used to ensure safe operation of the reservoir which includes a conduit in fluid communication with a lower part of said blood reservoir, a diaphragm associated with the other end of the conduit and movable by a differential hydraulic pressure applied by the blood through the conduit, and means for detecting the swelling and contracting movement of the diaphragm.
Claims12
An apparatus for detecting the volume of blood in a closed-type blood reservoir, comprising:
- a conduct having one end in fluid communication with a lower part of said blood reservoir;
- a membrane associated with the other end of the conduit, said membrane being set at a selected given height relative to said blood reservoir, and said membrane being deformable by a differential hydraulic pressure directly applied by the blood in said blood reservoir through the conduit, said differential hydraulic pressure being a function of the height of said membrane relative to said blood reservoir;
- said conduit being filled with blood so that the space between said membrane and said blood reservoir is filled with blood;
- and
- means for detecting a deformation of said membrane to thereby detect a volume of blood in said blood reservoir.
2 more elements
Dependencies are inferred from the claim text.