Apparatus for checking pulse and heart rates

• US 4,425,921 A
• Filed: 09/11/1981
• Issued: 01/17/1984
• Est. Priority Date: 01/19/1981
• Status: Expired due to Fees

• Current Assignee: Senoh Kabushiki Kaisha
• Original Assignee: Senoh Kabushiki Kaisha
• Inventors: Soeda, Toshimi, Sato, Kimihiko, Fujisaki, Iwao, Kosuge, Shuichi, Ogawa, Syuu
• Primary Examiner(s): Cohen, Lee S.
• Application Number:
  US06/301,122
• Time in Patent Office: 858 Days
• Field of Search: 128/639-641, 128/644, 128/664-667, 128/687-690, 128/670, 128/671, 128/696, 128/700, 128/706, 128/710
• US Class Current: 600/503
• CPC Class Codes: A61B 5/02438 with portable devices, e.g. worn by the patient
• CPC Class Codes: A61B 5/0245 by using sensing means generating electric signals, i.e. ECG signals
• CPC Class Codes: A61B 5/303 Patient cord assembly, e.g. cable harness
• CPC Class Codes: A61B 5/308 for electrocardiography [ECG]
• CPC Class Codes: A61B 5/6826 Finger
• CPC Class Codes: A61B 5/6831 Straps, bands or harnesses
• CPC Class Codes: A61B 5/6838 Clamps or clips

Abstract

A small portable-type apparatus for checking pulse or heart rate of a person engaged in exercise. Therefore, the apparatus according to the present invention can be used as a pulsimeter or a cardiometer according to the state of a person in motion. The apparatus is provided with a heart sensor having a plurality of cone-shaped conductive rubber electrodes to differentially detect an electrocardiowave voltage signal generated from three different places near the heart and a pulse sensor having a matching infrared-ray emitting diode and infrared-ray receiving phototransistor to detect the light reflected from the blood flowing through capillary vessels under the finger pad. The apparatus additionally functions as a stopwatch or a timer as selected by a mode-selector switch.

Claims

1. An apparatus for checking pulse and heart beat rates of a person, which comprises:

(a) heart beat sensor means for detecting an electrocardiowave and outputting an electrocardiowave voltage signal;

(b) pulse beat sensor means for detecting a pulse and outputting a pulse signal;

(c) connector means to which either one of said heart beat sensor means and said pulse beat sensor means is selectively connected;

(d) analog switch means connected by said connector means to said heart beat sensor means and said pulse beat sensor means;

(e) microcomputer means connected to said analog switch means, said analog switch means connecting said heart beat sensor means to said microcomputer means when said heart beat sensor means is connected to said connector means and said pulse beat sensor means to said microcomputer means when said pulse beat sensor means is connected to said connector means, said microcomputer means operable for calculating either one of said heart beat rate per minute and said pulse beat rate per minute in response to either of the electrocardiowave voltage signal and the pulse signal; and

(f) indicator means connected to said microcomputer means for displaying the calculated heart beat rate or pulse beat rate.

2. An apparatus for checking pulse and heart beat rates of a person as set forth in claim 1, wherein said heart beat sensor means comprises:

(a) a flexible strap so sized as to fit around the person'"'"'s chest and having a plurality of passage means for preventing accumulation of perspiration when the strap is fitted around the person'"'"'s chest;

(b) three flexible circular-cone-shaped electrodes attached to said strap at positions so chosen that when said strap is fitted around the person'"'"'s chest, a first electrode contacts the person'"'"'s chest at a point directly opposing the person'"'"'s heart and the second and third electrodes contact the person'"'"'s chest at points on opposite sides of the person'"'"'s heart, respectively;

(c) a connector attached to said strap for electrically connecting each of said electrodes to said connector means of the apparatus;

(d) three wires molded into said strap electrically connecting each of said three electrodes to said connector respectively; and

(e) a pair of cloth belts each having first and second ends, one of said belts including a buckle at the first end thereof and the other of said belts including a clip at the first end thereof, each of said belts being connected at the second ends thereof to opposing ends of said strap for adjustably fastening said heart beat sensor means around the person'"'"'s chest.

3. An apparatus for checking pulse and heart beat rates of a person as set forth in claim 1, wherein said pulse beat sensor means comprises:

(a) a flexible ring of variable diameter and so sized as to fit around the person'"'"'s finger at a point remote from the tip thereof, said ring being open at both ends to allow egress of perspiration;

(b) a sensor unit including an infrared light-emitting diode and an infrared phototransistor, said sensor unit being molded within said ring at a position exposed to the person'"'"'s finger when said pulse beat sensor means is in use so that the phototransistor detects and outputs a pulse signal indicative of the intensity of the infrared light emitted from the light emitting diode and reflected from the person'"'"'s finger; and

(c) a connector attached to said ring electrically connecting said sensor unit to said connector means of the apparatus.

4. Apparatus for checking and displaying cardiac rates comprising:

(a) first sensor means for detecting an electrocardiowave and outputting an electrocardiowave voltage signal;

(b) second sensor means for detecting a pulse beat and outputting a pulse signal;

(c) electric circuit means comprising;

(i) first circuit means for filtering said electrocardiowave signal;

(ii) second circuit means for filtering said pulse signal; and

(iii) computing and display means for selectively computing heart beat rate from said filtered electrocardiowave voltage signal and a pulse rate from said filtered pulse signal and for displaying the selectively computed rate;

(d) common connector means for connecting one of said first and second sensor means to said electrical circuit means; and

(e) switching means for selectively connecting said first circuit means to said computing and display means when said first sensor means is connected to said common connector means and for connecting said second circuit means to said computing and display means when said second sensor means is connected to said common connector means;

whereby an appropriate one of said heart beat rate or said pulse rate is computed and displayed when either of said first or second sensor means is connected to said common connector means.

5. Apparatus for checking and displaying cardiac rates as recited in claim 4 wherein said switching means is responsive to signals received via said common connector means from said first and second sensor means for connecting said first or second circuit means to said computing and display means.