Pulse oxymeter having probe with warming means

• US 5,131,391 A
• Filed: 05/31/1990
• Issued: 07/21/1992
• Est. Priority Date: 06/22/1989
• Status: Expired due to Term

• Current Assignee: Colin Medical Technology Corporation (Omron Corporation)
• Original Assignee: Colin Electronics Co., Ltd.
• Inventors: Sakai, Hiroshi, Kohmura, Satoshi
• Primary Examiner(s): Pellegrino, Stephen C.
• Assistant Examiner(s): Shumaker, Steven J.
• Application Number:
  US07/531,099
• Time in Patent Office: 782 Days
• Field of Search: 128/633, 128/637, 128/664, 128/666, 128/736, 128/742, 356/41, 374/142
• US Class Current: 600/334
• CPC Class Codes: A61B 5/02416 using photoplethysmograph signals, e.g. generated by infrared radiation A61B5/14552 takes precedence
• CPC Class Codes: A61B 5/14552 Details of sensors specially adapted therefor
• CPC Class Codes: A61B 5/1491 Heated applicators

Abstract

A pulse oxymeter for measuring a blood oxygen saturation of a subject, including a first device for emitting toward a body portion of the subject a first light having a first wavelength and a second light having a second wavelength different from the first wavelength, a second device for detecting an intensity of each of the first and second lights transmitted through, or reflected by, the body portion of the subject and generating a photoelectric pulse wave signal representative of the detected intensity of each of the first and second lights, a third device for determining a blood oxygen saturation of the subject based on the pulse wave signals corresponding to the first and second lights, a probe which supports the first and second devices and is adapted to contact the body portion of the subject, and a warming device for warming the body portion of the subject.

Claims

1. A pulse oxymeter for measuring a blood oxygen saturation of a subject, including (a) a first device for emitting toward a body portion of the subject a first light having a first wavelength and a second light having a second wavelength different from the first wavelength, (b) a second device for detecting an intensity of each of the first and second light transmitted through, or reflected by, the body portion of the subject and generating a photoelectric pulse wave signal representative of the detected intensity of each of the first and second lights, (c) a third device for determining a blood oxygen saturation of the subject based on the pulse wave signals corresponding to the first and second lights, (d) a heat conductor body adapted to contact the body portion, (e) a temperature changing device for changing a temperature of the heat conductor body, (f) a measuring device for measuring the temperature of the heat conductor body, and (g) a probe which supports the first and second devices, heat conductor body, and temperature changing device, wherein the improvement comprises:

a deep body thermometer for measuring a deep body temperature of said subject; and

control means for controlling said temperature changing device so that the measured temperature of said heat conductor body is equal to the measured deep body temperature of said subject.

2. The pule oxymeter as set forth in claim 1, wherein said temperature changing device comprises a Peltier'"'"'s element, said control means controlling said Peltier'"'"'s element by changing directions of a direct electric current supplied to said Peltier'"'"'s element.

3. The pulse oxymeter as set forth in claim 1, wherein said temperature changing device comprises a heating wire, said control means controlling the heat generation of said heating wire by adjusting electrical power supplied to said heating wire.

4. The pulse oxymeter as set forth in claim 1, wherein said first device comprises a plurality of first light emitting elements and a plurality of second light emitting elements, said first and second light emitting elements being alternately disposed along a circle, said second device being disposed at a center of said circle.

5. A pulse oxymeter for measuring a blood oxygen saturation of a subject, including (a) a first device for emitting toward a body portion of the subject a first light having a first wavelength and a second light having a second wavelength different from the first wavelength, (b) a second device for detecting an intensity of each of the first and second lights transmitted through, or reflected by, the body portion of the subject and generating a photoelectric pulse wave signal representative of the detected intensity of each of the first and second lights, (c) a third device for determining a blood oxygen saturation of the subject based on the pulse wave signals corresponding to the first and second lights, (d) a heat conductor body adapted to contact the body portion, (e) a temperature changing device for changing a temperature of the heat conductor body, and (f) a supporting device for supporting the first device, second device, heat conductor body, and temperature changing device, wherein the improvement comprises:

said temperature changing device comprising a Peltier'"'"'s element, said Peltier'"'"'s element contacting said heat conductor body;

said temperature changing device further comprising heat radiating means for radiating heat, said heat radiating means having a first surface contacting said Peltier'"'"'s element and a second surface contacting ambient atmosphere; and

control means for controlling said Peltier'"'"'s element by changing directions of a direct electric current supplied to the Peltier'"'"'s element, so that the Peltier'"'"'s element generates heat to said heat conductor body, or sinks heat from the heat conductor body.

6. The pulse oxymeter as set forth in claim 5, further comprising:

measuring means for measuring the temperature of said heat conductor body; and

input means for specifying a reference temperature;

said control means controlling said Peltier'"'"'s element so that the measured temperature of said heat conductor body is equal to said reference temperature.

7. The pulse oxymeter as set forth in claim 6, wherein said reference temperature is a normal deep body temperature.

8. The pulse oxymeter as set forth in claim 5, further comprising:

first measuring means for measuring the temperature of said heat conductor body; and

second measuring means for measuring a deep body temperature of said subject;

said control means controlling said Peltier'"'"'s element so that the measured temperature of said heat conductor means is equal to the measured deep body temperature of said subject.

9. The pulse oxymeter as set forth in claim 5, wherein said control means controls said Peltier'"'"'s element so that the Peltier'"'"'s element generates heat when the magnitude of said photoelectric pulse wave signal is below a reference level.

10. The pulse oxymeter as set forth in claim 5, wherein said first device comprises a plurality of first light emitting elements and a plurality of second light emitting elements, said first and second light emitting elements being alternatively disposed along a circle, said second device being disposed at a center of said circle.

11. The pulse oxymeter as set forth in claim 5, wherein said heat radiating means comprises a fin.