1996-11-12
1998-04-28
Kamm, William E.
Surgery
Truss
Pad
128903, A61B 504
Patent
active
057432694
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a cardiotachometer which detects an electrocardiographic signal, transmits information on cardio-condition by radio, and receives the information by radio to display a heart rate at a distant place.
For example, Japanese Unexamined Utility Model Publication No. 3-5405 discloses a cardiotachometer for observing a heart rate at a distant place. The cardiotachometer includes a transmitting section for detecting an electrocardiographic signal obtained from a pair of electrodes mounted near the heart of a user and transmitting the resultant information by radio, and a compact information device as a receiving section which is incorporated in a wristwatch or the like and can display the heart rate by performing an arithmetic operation based on the received radio signal.
In the above conventional cardiotachometer, the transmitting section transmits a radio signal every time an electrocardiographic signal is detected, and the receiving section receives the signal. That is, the reception timing coincides with the heartbeat timing. When the receiving section erroneously receives various types of noise such as electromagnetic noise caused by the alarm sound emitted at a railway crossing, the reception timing of the noise deviates from the heartbeat timing, and hence an erroneous heart rate is displayed.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a cardiotachometer which solves the problem in the conventional cardiotachometer and employs an improved communication method for transmitting and receiving sections to be free from the influence of noise.
An arrangement of the present invention comprises a transmitting section and a receiving section. The transmitting section includes a detection circuit for detecting an electrocardiographic signal obtained from a pair of electrodes mounted near the heart of a human body and generating a detection signal, an interval data creating circuit for counting generation intervals of the detection signals with signals of a predetermined period and generating interval data, a serial data creating circuit for converting the interval data into a serial signal and generating a serial data signal, a transmission circuit for modulating the serial data signal and transmitting the signal as a radio signal, and a battery as a power supply. The receiving section includes a reception circuit for receiving and demodulating the radio signal from the transmitting section and generating a reception signal, a data decoding circuit for decoding the reception signal and generating electrocardiographic interval data, a calculation circuit for calculating a heart rate from the electrocardiographic interval data, and a display section for displaying the heart rate.
With the above arrangement even if the reception circuit receives noise or an irrelevant signal, the data decoding circuit cannot properly decode the data since the signal is not pertinent data. Because the data obtained in the previous proper reception is displayed, no erroneous heart rate is displayed.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram showing the transmitting section of a cardiotachometer according to an embodiment of the present invention;
FIG. 2 is a block diagram showing the receiving section of the cardiotachometer according to the embodiment of the present invention;
FIG. 3 is a timing chart for illustrating the operation of a reception control circuit;
FIG. 4 is a view showing how the cardiotachometer according to the embodiment of the present invention is mounted;
FIG. 5 is a view showing the interior of the transmitting section of the cardiotachometer according to the embodiment of the present invention;
FIG. 6 is an external view showing the receiving section of the cardiotachometer according to the embodiment of the present invention; and
FIG. 7 is a view showing an example of the format of a signal to be transmitted from the transmitting section to the receiving section.
DETAILED DESCRIPTION OF THE PRE
REFERENCES:
patent: 3953848 (1976-04-01), Dillman et al.
patent: 3972320 (1976-08-01), Kalman
patent: 4202350 (1980-05-01), Walton
patent: 4830021 (1989-05-01), Thornton
patent: 5157604 (1992-10-01), Axford et al.
Kihara Hiroyuki
Murakami Tomomi
Okigami Tomio
Osa Takashi
Citizen Watch Co. Ltd.
Kamm William E.
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