Sensing device for cardio-pulmonary functions

• US 4,517,982 A
• Filed: 08/09/1982
• Issued: 05/21/1985
• Est. Priority Date: 08/10/1981
• Status: Expired due to Fees

• Current Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Original Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Inventors: Yoshida, Kenichi, Okawa, Shinichi, Shiga, Tetsuya, Hiramoto, Junichi
• Primary Examiner(s): Cohen, Lee S.
• Application Number:
  US06/406,145
• Time in Patent Office: 1,016 Days
• Field of Search: 128/635, 128/639-641, 128/670, 128/671, 128/716, 128/700
• US Class Current: 600/358
• CPC Class Codes: A61B 5/0245 by using sensing means generating electric signals, i.e. ECG signals
• CPC Class Codes: A61B 5/0816 Measuring devices for examining respiratory frequency measuring frequency of electric signals G01R23/00
• CPC Class Codes: A61B 5/14542 for measuring blood gases A61B5/14551 takes precedence
• CPC Class Codes: A61B 5/1477 non-invasive
• CPC Class Codes: A61B 5/1491 Heated applicators
• CPC Class Codes: A61B 5/25 Bioelectric electrodes therefor
• CPC Class Codes: A61B 5/28 for electrocardiography [ECG]

Abstract

A sensor for use in detecting cardiopulmonary functions employs a skin-heating conductive surface for use in achieving vasodilitation for the measurement of PO₂ and PCO₂. The same surface is employed as an electrode for a heartbeat and/or respiration rate measuring device.

Claims

1. A sensor device for the measurement of cardio-pulmonary functions, comprising:

first means for the transcutaneous measurement of a blood gas partial pressure, said first means including sensing elements and a heat conducting member having a skin contact surface and surrounding the sensing elements of said first means; and

second means for measuring at least one of the heartbeat and respiration rate, said second means including an electrically conducting electrode comprising said heat conducting member.

2. A device as claimed in claim 1, said first means comprising one of a PO₂ and PCO₂ sensor.

3. A device as claimed in claim 1, said second means including circuit means electrically connected to said heat conducting member for measuring the heartbeat and respiration rate from a signal generated by said heat conducting member.

4. A device as claimed in claim 1, said first means comprising a first measuring circuit and one of a PO₂ and PCO₂ sensor including as said sensing elements an electrode pair electrically connected to said measuring circuit by a pair of lead wires, and said second means including a second measuring circuit electrically connected to said heat conducting member by a further lead wire for measuring respiration and heartbeat from a signal generated by said heat conducting member.

5. A device as claimed in claim 4, said pair of lead wires and said further lead wire together constituting a three-wire cable extending from said sensor and said heat conducting member to the combination of said first and second measuring circuits.

6. A sensor for the simultaneous and continuous measurement of the cardio-pulmonary functions of the human body, comprising:

(a) an electrode assembly for the transcutaneous measurement of partial gas pressure in arterial blood comprising the following three disassemblably assembled parts;

an electrode part having an anode or reference electrode having a ring-shaped working surface, a cathode or measuring electrode having a working surface inside said anode or reference electrode, and an electrode holder of thermally and electrically insulating material holding said anode or reference electrode and said cathode or measuring electrode apart from one another in insulated relation,

a membrane holder part having a blood gas permeable membrane thereon and a membrane holder holding the periphery of said membrane and holding the membrane in spaced relation to the anode and cathode; and

a skin heating part having an electrical heater, and a heat conducting metal block to which said heater is heat-conductively connected, said heat conducting metal block having a skin-contact surface and surrounding said anode and cathode;

(b) means for measuring at least one of the respiration rate and heartbeat connected to said skin-contact surface, said surface comprising an electrode of said measuring means.

7. A sensor device for the measurement of cardio-pulmonary functions, comprising:

first means for the transcutaneous measurement of a first blood gas partial pressure, said first means including first sensing elements and a first heat conducting member having a skin contact surface and surrounding said first sensing elements;

second means for the transcutaneous measurement of a second blood gas partial pressure, said second means including second sensing elements and a second heat conducting member having a skin contact surface and surrounding said second sensing elements; and

third means for measuring at least one of the heartbeat and respiration rate, said third means including a first electrically conducting electrode comprising said first heat conducting member and a second electrically conducting electrode comprising said second heat conducting member.