公开(公告)号：US5385539A

公开(公告)日：1995-01-31

申请号：US906926

申请日：1992-06-30

Applicant: David L. Maynard

Inventor： David L. Maynard

IPC: G01J1/16 ,  G01N15/05 ,  G01N21/51 ,  G01N33/487 ,  A61B5/00

CPC classification number: G01N21/51 ,  A61M2205/331 ,  A61M2205/3313 ,  G01J2001/1647 ,  G01N2015/055 ,  G01N2021/1738 ,  G01N2021/4709 ,  G01N2201/0621 ,  G01N2201/0662

Abstract: An apparatus and method are provided for measuring the hematocrit level of blood. The presently preferred embodiment comprises a light emitting device which emits an amount of light into a blood sample. This light travels through the blood sample to two light detecting devices positioned relative to the light emitting device in a predetermined geometry such that light emitted from the light emitting device must travel farther to reach one of the light detecting devices than to reach the other, thereby forming a light path from the light emitting device to one light detecting device which is longer than the path from the light emitting device to the other light detecting device. According to the present invention, the amount of light detected by one of the light detecting devices is regulated so that the amount of light detected is constant. Thereafter, the amount of light detected by the unregulated light detecting device is a linear representation of the hematocrit of the blood in the blood sample. The hematocrit sensor may be used within a plasma separator apparatus wherein the hematocrit measurement regulates the operating parameters of the autotransfusion system to maintain the hematocrit of the blood within a predetermined range.

Abstract translation: 提供了一种用于测量血液血细胞比容水平的装置和方法。 目前优选的实施方案包括将一定量的光发射到血液样品中的发光装置。 该光通过血液样本传播到相对于发光器件相对于预定几何形状定位的两个光检测装置，使得从发光装置发射的光必须更远地行进到达其中一个光检测装置而不是到达另一个，由此 形成从发光器件到比从从发光器件到另一光检测器件的路径长的光检测器件的光路。 根据本发明，调节由一个光检测装置检测的光量，使得检测到的光量是恒定的。 此后，由未调节的光检测装置检测的光量是血液样品中血液的血细胞比容的线性表示。 血细胞比容传感器可以在等离子体分离器装置中使用，其中血细胞比容测量调节自体输血系统的操作参数以将血液的血细胞比容维持在预定范围内。