Optical organism measuring apparatus

• US 5,353,791 A
• Filed: 02/21/1992
• Issued: 10/11/1994
• Est. Priority Date: 02/28/1991
• Status: Expired due to Fees

• Current Assignee: Shimadzu Corporation
• Original Assignee: Shimadzu Corporation
• Inventors: Eda, Hideo, Tamura, Tomomi
• Primary Examiner(s): Sykes, Angela D.
• Application Number:
  US07/838,848
• Time in Patent Office: 963 Days
• Field of Search: 128/633, 128/664, 128/665, 128/666-667, 128/634, 351/221, 356/39-41
• US Class Current: 600/310
• CPC Class Codes: A61B 5/14553 specially adapted for cerebral tissue

Abstract

Disclosed herein is an optical organism measuring apparatus in which cables provided on both light transmission and receiving sides are sufficiently reduced in diameter and provided with flexibility for attaining handleability while light can be transmitted and received in high efficiency so that information can be obtained from a deep portion in an organism. Semiconductor lasers (2-1, 2-2, 2-3) are coupled with incident ends of a plurality of single core optical fibers which are contained in a flexible probe (12), so that laser light guided by the single core optical fibers is applied to an organism (8) from a forward end portion of the probe (12). A light receiving probe (18) is provided on its forward end with a silicon photodiode (14), which is attached in close contact to the organism (8) to receive light transmitted through or reflected by the organism (8). This silicon photodiode (14) is integrated with a preamplifier (16). A cable for transmitting a detection signal which is amplified by the preamplifier (16) is formed by a flexible shielding wire.

Claims

1. An optical organism measuring apparatus for applying light of one or more specific wavelengths to an organism and detecting said light being transmitted through or reflected by said organism thereby obtaining vital information, said apparatus comprising:

a light application means, including;

a plurality of semiconductor lasers of different wavelengths;

a plurality of single core optical fibers coupled with said semiconductor lasers, respectively;

a light application probe means containing light emitting ends of said plurality of said single core optical fibers;

a light detection means, including a light detection probe means with a solid state detector integrated with a preamplifier for receiving said light from said organism;

a cable connecting said light application probe means to a light detection circuit;

a sample-and-hold circuit adapted to sample and hold a signal from said light detection probe means, which is amplified by said preamplifier; and

a main amplifier adapted to amplify an output signal from said sample-and-hold circuit.

2. An apparatus according to claim 1, wherein said light application probe means is provided with a prism means for changing the direction of said laser light passing through said single core optical fibers perpendicularly prior to being applied to an organism.

3. An apparatus according to claim 1, wherein said plurality of semiconductor lasers are coupled with said plurality of single core optical fibers by laser modules.

4. An apparatus according to claim 2, wherein said plurality of semiconductor lasers are coupled with said plurality of single core optical fibers by laser modules.

5. An apparatus according to claim 1, wherein said plurality of single core optical fibers are bundled into a sheath within said light application probe means.

6. An apparatus according to claim 1, including a cable connecting said light application probe means to a light detection circuit.

7. An apparatus according to claim 6, wherein said cable is made of flexible shielding wire.

8. An apparatus according to claim 1, including a V-F converter means for an amplified signal voltage from said main amplifier to a frequency, and a central processing unit receiving an output signal from said V-F converter.