Oximeter with system for testing transmission path

• US 4,908,762 A
• Filed: 05/02/1988
• Issued: 03/13/1990
• Est. Priority Date: 05/08/1987
• Status: Expired due to Fees

• Current Assignee: Hamamatsu Photonics KK
• Original Assignee: Hamamatsu Photonics KK
• Inventors: Suzuki, Susumu, Hakamata, Naotoshi, Ozaki, Takeo, Yagi, Sumio
• Primary Examiner(s): Smith, Jerry
• Assistant Examiner(s): Huntley, David
• Application Number:
  US07/188,910
• Time in Patent Office: 680 Days
• Field of Search: 356/41, 356/434, 128/633, 128/664, 364/413.01, 364/413.09
• US Class Current: 600/407
• CPC Class Codes: A61B 5/14553 specially adapted for cerebral tissue
• CPC Class Codes: G01N 21/3151 using two sources of radiation of different wavelengths G01N21/33 - G01N21/39 take precedence

Abstract

An examination apparatus measures the oxygenation in body organs by the near infrared light transmission spectrophotometry. To inspect the examination apparatus itself before the oxygenation measurement, an illumination-side fixture and a detection-side fixture have such structures that these fixtures can be assembled together in such a manner that near infrared light is directly made incident on the detection-side fixture from the illumination-side fixture. In the midst of the measurement, the examination apparatus is regularly inspected and a photomultiplier tube can be separately inspected by employing a separate light source for inspection.

Claims

1. An examination apparatus for measuring the oxygenation in an object with electromagnetic wave transmission spectrophotometry, comprising:

a light source means for sequentially emitting electromagnetic waves housing different wavelengths;

an illumination-side fixture for receiving said electromagnetic waves emitted from said light source means and outputting said electromagnetic waves;

a detection-side fixture for detecting electromagnetic waves output from said illumination-side fixture and for sending said transmitted electromagnetic waves to a transmission light detection means;

said transmission light detection means for detecting electromagnetic waves sent from said detection-side fixture and for outputting path-transmission light data; and

a computer system for receiving said path-transmission light data from said transmission light detection means and for judging whether said examination apparatus is in an optimum condition on the basis of said path-transmission light data;

wherein

said illumination-side fixture and said detection-side fixture have such structures that said fixtures can be assembled together so that electromagnetic waves output from said illumination-side fixture are directly made incident on and detected by said detection-side fixture and said computer system includes a memory means for storing previously obtained optimum path-transmission light data and includes a processor means for comparing said path-transmission light data to said previously obtained optimum path-transmission light data.

2. An examination apparatus as claimed in claim 1, wherein said electromagnetic waves are near infrared light rays.

3. An examination apparatus for measuring the oxygenation in an object with electromagnetic wave transmission spectrophotometry, comprising:

a light source means for sequentially emitting electromagnetic waves with different wavelengths;

an illumination-side fixture for receiving said electromagnetic waves emitted from said light source means and outputting said electromagnetic waves;

a detection-side fixture for detecting electromagnetic waves output from said illumination-side fixture and for sending said transmitted electromagnetic waves to a transmission light detection means;

an inspection light source means for outputting an inspection electromagnetic wave according to an instruction from a computer system and sending said inspection electromagnetic wave to the transmission light detection means;

said transmission light detection means for detecting electromagnetic waves output from said illumination-side fixture and for detecting said inspection electromagnetic wave and outputting first path-transmission light data; and

said computer system for receiving said first path-transmission light data from said transmission light detection means and judging whether said transmission light detection means is in an optimum condition;

wherein

said computer system has a memory means for storing previously obtained optimum first path-transmission light data and a processor means for comparing said first path-transmission light data to said previously obtained optimum first path-transmission light data.

4. An examination apparatus as claimed in claim 3, wherein said electromagnetic waves and said inspection electromagnetic wave are near infrared light rays.

5. An examination apparatus as claimed in claim 3, wherein said inspection electromagnetic wave is emitted from said inspection light source means in a period when said electromagnetic waves are not emitted from said light source means in the midst of the oxygenation measurement.

6. An examination apparatus as claimed in claim 3, further comprising:

an output light detection means for detecting said electromagnetic waves emitted from said light source means or said inspection electromagnetic wave emitted from said inspection light source means and outputting output light data of said light source means or outputting output light data of said inspection light source means;

wherein

said computer system further receives said output light data of said light source means or said output light data of said inspection light source means and further judges whether light source means or inspection light source means is in an optimum condition; and

said computer system has a memory means for storing previously obtained optimum light data and a processor means for comparing said output light data of said light source means or said output light data of said inspection light source means to said previously obtained optimum output light data.

7. An examination apparatus as claimed in claim 6, wherein said electromagnetic waves and said inspection electromagnetic wave are near infrared light rays.

8. An examination apparatus as claimed in claim 6, further comprising:

a selector for receiving said electromagnetic waves emitted from said light source means and said inspection electromagnetic wave emitted from said inspection light source means, selecting either said electromagnetic waves emitted from said light source means or said inspection electromagnetic wave emitted from said inspection light source means to be sent to said output light detection means according to an instruction from said computer system.

9. An examination apparatus as claimed in claim 3, wherein

said illumination-side fixture and said detection-side fixture have such structures that said fixtures can be assembled together so that electromagnetic waves outputted from said illumination-side fixture are directly made incident on and detected by said detection-side fixture;

said transmission light detection means further outputs second path-transmission light data in response to said electromagnetic waves sent from said detection-side fixture;

said computer system further receives said second path-transmission light data from said transmission light detection means and judges whether said examination apparatus is in an optimum condition; and

said memory means further stores previously obtained optimum second path-transmission light data and said processor means further compares said second path-transmission light data to said previously obtained optimum second path-transmission light data.