DE3345286A1 - ELECTRONIC SPHYGMOMANOMETER - Google Patents

Description

DiPL-PHYS.

PATENT ADVOCATE

EUROPEAN PATENT ATTORNEY

F. FINALLY. PO Box 13 20. 0-8034 QERMERINQ TELEPHONE: (Οββ) 84 36 38

TELEX: 62 1730 pet d

CABLES: PATENDLY GERMERtNQ FLORAL HATE 8

D-8034 GERMERING December 12, 1983 E / m My files: S-5138

Applicant: Seiko Instruments & Electronics Ltd., Tokyo, Japan

Electronic sphygmomanometer

The invention relates to an electronic sphygmomanometer, particularly the Can be used in an ambulance to receive body signals how to measure blood pressure and pulse.

There are already pulse measuring devices known with which the pulse by detection of cardiac action potentials is counted (US Pat. No. 4,295,472). There are also blood pressure measuring devices known with which the systolic and the diastolic A patient's blood pressure can be measured and which is a synchronization enable a blood pressure signal with a Korotkoff sound signal (US-PS 39 05 354).

It is the object of the invention to specify an electronic sphygmomanometer, a circuit for the synchronization or asynchronization of a detection of the pulse pressure and the detection of a Korotkoff tone signal with a proof of the cardiac action potential in the detection of the blood pressure. Furthermore, a device for the detection of blood pressure are specified in a measuring instrument for biosignals, which can be used in a motor vehicle or in a quiet environment, the Detection can be done synchronously or asynchronously with a signal corresponding to the cardiac action potential. Furthermore, a device for synchronization or asynchronizing a pulse pressure signal and a Korotkoff tone signal from a blood pressure detection circuit with a cardiac action potential detection signal are indicated by a detection circuit for the heart action potential, the means for selecting a synchronization or has asynchronization.

In the case of an electronic syphgmomanometer, this task is carried out at the beginning mentioned type solved according to the invention by the subject matter of claim 1. Appropriate refinements of the invention are the subject of the subclaims.

The invention is to be explained in more detail, for example, with the aid of the drawing. Show it:

Fig. 1 is a schematic representation of an electronic syphgmomanometer according to the invention;

2 output signals of the detection circuit for the cardiac action potential and the blood pressure detection circuit in the sphygmomanometer in Fig. 1;

3 shows an embodiment of a circuit for the sphygmomanometer in Fig. 1; and

FIG. 4 shows a further exemplary embodiment of a in the sphygmomanometer in FIG Fig. 1 included circuit.

The embodiment shown in Fig. 1 of a sphygmomanometer according to of the invention has electrodes 2a and 3a applied to a person 1, which serve to demonstrate the cardiac action potential. The electrodes 2a and 3a are applied to the person's right and left arms and via leads 2b and 3b connected to a detection circuit 4 for the cardiac action potential. From the output signals of the sphygmomanometer shown in FIG the output signal S1 is generated by the detection circuit 4 and the signals R1 and R2 are with a first and a subsequent second cardiac action potential synchronized. A blood pressure cuff 5a is wrapped around the left arm of the person 1, on did a rubber ball 5b to produce a Positive pressure is connected. A rubber hose 6 is used to supply air from the cuff to a pressure sensor, not shown, which together is provided with a microphone, not shown, in a detection circuit 7 for the blood pressure. The detection circuit 7 generates a signal S2 which shows the blood pressure, as well as a signal S3, which is a Korotkoff sound signal (K-sound signal) contains.

A pulse pressure signal! P1 and a K-tone signal K1 are with the Herzaktionspotenlisisigna! R1 synchronized. A pulse pressure signal P4 and a K-tone signal K4 are synchronized with the cardiac action potential signal R2. This is a typical one Example of blood pressure measurement in a quiet environment, In such cases, the synchronism of a cardiac action potential signal with a pulse pressure signal and a K-tone signal need not be taken into account.

If the synchronization of the action potential signal is not terminated, can also be the blood pressure of the person whose cardiac action potential for a measurement is too low, cannot be detected either. This is a major disadvantage. If, on the other hand, the blood pressure is, for example, in an ambulance is measured, there are noises of the automobile and pulsations detected by the detection circuit for the blood pressure. As a consequence of this signals such as P2, P3 and K2, K3 are generated, and the blood pressure cannot be measured based on the pulse pressure and the K signal alone. In this Case it is very advantageous if the pulse pressure and the K-signal with the Cardiac action potential are synchronized. When the signals S1, S2 and S3 are supplied and when, as shown in FIG. 2, there is no noise output signal occurs, blood pressure can be measured in an ambulance as well as in a perfectly quiet environment.

According to the invention it is therefore possible to measure the blood pressure with the help of a Biosignal measuring instrument synchronous or asynchronous with a cardiac action potential signal so that measurement can be made in a noisy environment such as an ambulance or measurement in a quiet environment can.

In the embodiment shown in Fig. 3 are an AND circuit 8 with three inputs, an inverter 9, AND circuits 10 and 11, an OR circuit 12, a resistor 13 and a switch 14 are provided. With the help of the resistor 13, one of the two inputs of the AND circuit 10 * be kept at the high value. The switch 14 is used to bring this input to the low value. The signals S1, S2 and S3 are the inFig. Signals shown in 2, that is, a cardiac action signal, a pulse pressure signal and a K-tone signal. When the switch 14 is closed, the pulse pressure signal S2 cannot pass through the AND circuit 10 because one of the inputs of this circuit is at the low value, so that the Pulse pressure signal S2 of AND circuit 8 together with the cardiac action potential signal S1 is fed. Although then an input of the OR circuit 12, -der is connected to the output of the AND circuit 10, is at the low value, a signal at the output of the OR circuit 12 which is equal to the output signal of the AND circuit 8, and this signal is supplied to the AND circuit 11.

Fig. 4 shows a further embodiment in which the electrodes 2a and 3a serve to detect the cardiac action potential and lines 2b and 3b, which are connected to electrodes 2a and 3a, supply the K-tone signal S3.

to lead. The AND circuit 11 generates an AND output signal of the cardiac action potential signal S1, the pulse pressure signal S2 and the K-tone signal S3 (S1 χ S2 χ S3). When switch 14 is open, inverter 9 and the input of AND circuit 10 are high. Then there is the Output of the inverter 9 at the low value and the AND circuit 8 becomes non-conductive while the AND circuit 10 becomes conductive. As the cardiac action potential signal cannot pass through the AND circuit 8, the AND circuit 11 generates an AND output signal in accordance with the pulse pressure signal S2 and the K-tone signal S3 (S2 χ S3). This state corresponds the measurement of the blood pressure, if the detection of the cardiac action potential is not necessary or impossible. According to the invention can be in a simple manner between the measurement of the blood pressure with synchronization or asynchronization and the measurement of the cardiac action potential by closing or opening the Switch 14 can be switched.

FIG. 4 shows a further exemplary embodiment in which the cardiac action potential detection electrodes 2a and 3a connecting conductors 2b and 3b are connected, which are surrounded by shielding tubes 15a and 16a. The shielding tubes 15a and 16a are grounded by conductors 15b and 16b when these are connected with a plug connection 17 to a socket 18 to provide a connection to a ground line 16c. The connecting lines 2b and 3b are connected to the detection circuit (not shown) for the cardiac action potential via the conductors 2c and 3c and the connector 17,18} in connection. With 19 is a schematically shown housing of the biosignal measuring instrument designated. A conductor 15c, which is connected to the conductor 15b, is connected to a resistor 13 and the inverter 9 as well as to one of the inputs of the AND circuit 10 connected. When the cardiac action potential is detected, the conductor 15c is grounded via the conductor 15b by the connector 17, 18 is made so that the inverter 9 and one of the inputs of the AND circuit 10 is at the low level. On the other hand, when the cardiac action potential is not measured or not detected can, the connection between the conductor 15c and earth is interrupted, so that the inverter 9 and one of the inputs of the AND circuit 10 to the get high value. Therefore, plugging in and unplugging corresponds to closing and opening switch 14 in FIG. 3, respectively. Electrodes 2a and 3a are removed if the cardiac action potential does not need to be demonstrated. It is practically important that the person be protected from voltage surges or that the detection circuit is damaged by voltage surges for the cardiac action potential takes place. A particular advantage of the invention is

also to be seen in the fact that the blood pressure detection is asynchronous with the detection of the cardiac action potential takes place simultaneously with the removal of the electrodes 2a and 3a.

In the exemplary embodiments described, it is therefore possible in a simple manner be switched between synchronization and asynchronization of blood pressure detection and the detection of cardiac action potential, which is an essential Means advantage in measuring blood pressure in an ambulance using a very simple construction.

Claims (1)

DIPLr-PHYS. RENDLICI PATENT LAWYER O O 4 O Z O D EUROPEAN PATENT ATTORNEY F. FINALLY. PO Box 13 2B. D-8034 QEHMERINQ TELEPHONE: (089) 84 30 38 TELEX; 52 1730 pat d CABLES: PATENDLY QERMERINQ FLOWER STREET 8 0-8034 GERMERINQ Dec. 12, 1983 E / m My file: S-5138 Applicant: Seiko Instruments & Electronics Ltd., Tokyo, Japan Patent claims (1JElectronic sphygmomanometer with a blood pressure detection circuit for the detection of a pulse pressure signal and a Korotkoff tone signal, with Electrodes for the detection of cardiac action potentials, as well as with a detection circuit for the generation of cardiac action potential detection signals, since you rch characterized that a device for synchronization or asynchronizing the pulse pressure signal and the Korotkoff tone signal from the blood pressure detection circuit with the cardiac action potential detection signal is provided by the cardiac action potential detection circuit, and that a device is provided for selecting between synchronization and asynchronization can be actuated. 2 "Sphygmomanometer according to claim 1, characterized in that that the device for selection is a mechanical switch (14). S. Sphygmomanometer according to Claim 1, characterized in that the device for selecting is a plug-in contact device (17) in order to Connection conductor of the cardiac action potential detection electrode with the cardiac action potential detection circuit connect to. 4. Sphygmomanometer according to claim 3, characterized in that that the connecting conductors are surrounded by shielding tubes (15a, 16a).