Circuit arrangement for the processing of physiological measuring signals

• US 4,023,565 A
• Filed: 06/19/1975
• Issued: 05/17/1977
• Est. Priority Date: 06/21/1974
• Status: Expired due to Term

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Ohlsson, Thomas
• Primary Examiner(s): Kamm, William E.
• Application Number:
  US05/588,467
• Time in Patent Office: 698 Days
• Field of Search: 128/2.06 B, 128/2.06 G, 128/2.06 R, 128/2.1 R
• US Class Current: 600/522
• CPC Class Codes: A61B 5/24 Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
• CPC Class Codes: A61B 5/30 Input circuits therefor
• CPC Class Codes: A61B 5/308 for electrocardiography [ECG]
• CPC Class Codes: A61B 5/7203 for noise prevention, reduction or removal
• CPC Class Codes: G06G 7/14 for addition or subtraction of vector quantities G06G7/22 ; computing the average by addition; differential amplifiers H03F3/45
• CPC Class Codes: H03F 3/68 Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics power amplifiers using a combination of several semiconductor amplifiers H03F3/211; combinations of amplifiers using coupling networks with distributed constants H03F3/602

Abstract

A circuit arrangement for the processing of physiological measuring signals, in which there is provided a plurality of input amplifiers each having a positive and a negative input, whose output signals control a signal reproducing arrangement, and which are each connected to a collector electrode. Connected to the positive inputs of the input amplifier are the collector electrodes for the signals, and that resistors are located between the negative inputs and the outputs of the input amplifiers, the negative inputs being connected across resistors with a common potential junction, and that the two inputs of a differential amplifier are connected to the outputs of respectively two input amplifiers, the output signal of the differential amplifier controlling the signal reproducing arrangement, and in which the common potential junction is connected to the collector electrode.

Claims

1. In a circuit arrangement for the processing of physiological measuring signals, including a plurality of input amplifiers each having respectively a positive input and a negative input;

a signal reproducing installation; and

a take-off electrode connected to each amplifier, said take-off electrodes for said signals being connected to the positive inputs of said input amplifiers;

first resistors being connected between said negative inputs and the outputs of said input amplifiers;

second resistors connected between said negative inputs and a potential junction common to all input amplifiers; and

a differential amplifier having two inputs connected to the outputs of each two of said input amplifiers, the output of said differential amplifier being connected to said signal reproducing installation, said differential amplifier providing an output signal for controlling said signal reproducing installation, a program selector connected between the outputs of said input amplifiers and the inputs of the differential amplifier for connecting pre-programmed output pairs of the input amplifiers to said differential amplifier, said common potential junction being connected to a take-off electrode free of ground potential.

2. A circuit arrangement as claimed in claim 1, comprising an impedance transformer connected between said last-mentioned take-off electrode and said common potential junction, said impedance transformer having a voltage amplification of 1, a high input resistance and a low output resistance.

3. A circuit arrangement as claimed in claim 1, said take-off electrodes comprising EKG-electrodes.

4. A circuit arrangement as claimed in claim 1, comprising means for directly transmitting the potential of said common potential junction to the input of at least one said differential amplifier.

5. A circuit arrangement as claimed in claim 1, each said input amplifier comprising an operational amplifier.