Apparatus for measuring physiological parameters of blood guided in an extracorporeal circulatory system
AssigneeStockert Instrumente GmbH
InventorAndreas Hahn
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Abstract
The invention relates to an apparatus for measuring physiological parameters of blood conveyed within an extracorporeal circulatory system. Two light sources (1a, 1b) emit light of varying wavelength into a spherical cavity (3) that comprises a reflective inner surface (3a). Light sensor means (2) receives part of the light propagating within the cavity (3). A tube portion of the extracorporeal circulation can be inserted into a second cavity (4) such that the light (La, Lb) emitted by the light sources encounters the boundary surface between the blood and an inner wall of the tube. The light returns to the cavity (3) at least to an extent by means of reflection and/or transmission.
Claims32
An apparatus adapted to measure physiological parameters of blood conveyed within an extracorporeal circulatory system, comprising:
- at least two light sources (1a, 1b) each emitting light of a different wavelength,
- at least one light sensor means (2),
- a first, spherical cavity (3) having a reflective inner surface (3a) and into which said light sources (1a, 1b) emit and from which said light sensor means (2) receives part of the light propagating within said first cavity, and
- a second cavity (4) into which a tube portion of said extracorporeal circulation is inserted such that the light (La, Lb) emitted by said light sources encounters the boundary surface between the blood and an inner wall of said tube and returns to said first cavity (3) at least to an extent by means of reflection and/or transmission.
An apparatus according to claim.13, wherein said light sources (1) comprise collimator optics.
Dependencies are inferred from the claim text.