Biological information measurement apparatus

• US 5,126,937 A
• Filed: 12/14/1990
• Issued: 06/30/1992
• Est. Priority Date: 07/01/1986
• Status: Expired due to Term

• Current Assignee: Terumo Kabushiki Kaisha (Terumo Corporation)
• Original Assignee: Terumo Kabushiki Kaisha (Terumo Corporation)
• Inventors: Uchida, Naoto, Shimomura, Takeshi, Daikuhara, Norio, Yamaguchi, Shuichiro, Ushizawa, Norihiko
• Primary Examiner(s): Shaw, Dale M.
• Assistant Examiner(s): CHUNG TRANS, XUONG MY
• Application Number:
  US07/626,413
• Time in Patent Office: 564 Days
• Field of Search: 364/413.11, 364/413.03, 128/631, 128/635, 374/172
• US Class Current: 600/301
• CPC Class Codes: A61B 5/145 Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissuemeasuring of blood pressure or blood flow A61B5/02; non-radiation detecting or locating of foreign bodies in blood A61B5/06
• CPC Class Codes: A61B 5/14539 for measuring pH
• CPC Class Codes: G01N 33/492 Determining multiple analytes

Abstract

A biological information measurement apparatus is adapted to measure biological information in an extracorporeal circuration or in a living body by various measurement circuits comprising circuit elements which are not affected by electrical disturbances, and to transmit the results of measurement in the form of a non-electrical signal which is not affected by electrical disturbances. Measured values from measurement sections are gathered at a central processing section separated from the measurement sections. The processing section converts the measured values into output values, compensates the values for temperature and outputs the values to a display unit and recorder.

Claims

1. A biological information measurement apparatus comprising:

biological information measuring means for continuously measuring electrical values corresponding to a plurality of biological information including at least one of ion-concentration and gas-concentration in body fluid and for outputting biological information signals;

first temperature measuring means in a body with said measuring means for measuring the temperature of the body fluid adjacent said biological information measuring means and for outputting a first temperature information signal;

transmitting means for non-electrically transmitting the biological information signals and the first temperature information signal by a time sharing method wherein it is possible to discriminate between said plurality of biological information and the first temperature information;

converting means for converting the biological information signals and the first temperature information signal transmitted by said transmitting means into an electrical signals;

correcting means for correcting parameters used in a calibration equation which determines said parameters through measuring said electrical values measured by said biological information measuring means under plural kinds of fluids having known ion-concentration or gas-concentration and known temperature, wherein the number of said plural kinds of fluids corresponds to the number of said parameters, each time before starting continuous measurement;

analysis means for analyzing the biological information signals, which have been converted into the electrical signals by said converting means, in dependence upon the type of biological information, with compensation of the measured biological information including temperature-compensation by using the first temperature information signal and with said corrected parameters, which has been converted into an electrical signal by said converting means; and

output means for outputting analytical results from said analyzing means to an external unit, the analytical results being standardized to correspond to the type of biological information.

2. The apparatus according to claim 1, wherein said transmitting means comprises optical communication means having one optical fiber cables.

4. The apparatus according to claim 1, wherein said measuring means includes an internal power supply.

5. The apparatus according to claim 1, wherein said measuring means includes a differential amplifier as means for measuring electromotive force, said amplifier having a high input resistance.

6. The apparatus according to claim 1, further comprising second temperature measuring means for measuring the temperature of said biological information measuring means and for outputting a second temperature information signal in order to temperature-compensate said biological information measuring means.

7. The apparatus according to claim 1, further comprising temperature computing means for computing a temperature through a convergency technique by using process loop from said first temperature information signal which has been converted into the electrical signal by said converting means, said analysis means analyzes the biological information signal with temperature-compensation by using said computed temperature.

8. The apparatus according to claim 1, wherein said transmitting means comprises optical communication means having a plurality of optical fiber cables.

9. The apparatus according to claim 1, wherein said output means comprises memory means.

3. The apparatus according to clam 1, wherein said output means comprises display means.