Apparatus for measuring hematocrit

• US 6,522,398 B2
• Filed: 12/08/2000
• Issued: 02/18/2003
• Est. Priority Date: 02/08/1999
• Status: Expired due to Term

• Current Assignee: Nellcor Puritan Bennett LLC (Medtronic Plc)
• Original Assignee: CME Telemetrix, Inc.
• Inventors: Cadell, Theodore E., Samsoondar, James
• Primary Examiner(s): SMITH, ZANDRA V
• Application Number:
  US09/732,211
• Publication Number:
  US 20010004285A1
• Time in Patent Office: 802 Days
• Field of Search: 356/39, 356/246, 356/440, 600/322, 422/82.05, 422/82.09, 436/164, 436/165, 73/614, 73/616.5, 73/616.6
• US Class Current: 356/39
• CPC Class Codes: G01N 21/3103 Atomic absorption analysis

Abstract

A method and apparatus for use in respect of samples which are assessed for quality prior to testing in a clinical analyzer. The method and apparatus identify parameters such as gel level and height of fluid above the gel in blood samples, where appropriate, for the purposes of positioning the specimen for determination of interferents. Such interferents include hemoglobin (Hb), total bilirubin and lipids. These interferents are determined by measurement of absorption of different wavelengths of light in serum or plasma, or other speciments, which are then compared with values obtained through calibration using reference measurements for the respective interferents in serum or plasma or other type of specimen. Determination of temperature of the specimen, as well as specimen type, for example whether the specimen is urine or plasma or serum, may also be carried out.

Claims

1. An apparatus for determining the hematocrit of a blood sample said apparatus comprising:

a) means for holding a specimen container wherein said means and said container have a longitudinal axis;

b) a radiation source disposed to direct radiation at said specimen and a radiation detector disposed to allow collection of transmitted or reflected radiation from said specimen, said radiation source comprising a linear array of LEDs disposed along one side of said axis of said container and said radiation detector comprising a corresponding array of silicon detectors on the opposite side of said container to collect transmitted radiation;

c) electrical means to couple said radiation source to an electronic driver; and

d) electrical means to couple said radiation detector to a computing means which analyzes output from said detector for determination of hematocrit of said sample.

2. The apparatus of claim 1 further comprising one or more lenses to focus said radiation from said radiation source to spread said radiation across said axis of said container, and further wherein said Apparatus contains one or more further lenses which collect transmitted or reflected radiation from said specimen and direct it to a spectrophotometric radiation detector.

3. The apparatus of claim 1 or 2 wherein said specimen container contains a sample identification label on the exterior surface of said container.

4. The apparatus of claim 1 or 2 wherein said radiation is transmitted through a label, a container and a sample.