Surgery – Truss – Pad
Patent
1990-10-25
1994-05-03
Howell, Kyle L.
Surgery
Truss
Pad
128908, 128710, A61B 50402
Patent
active
053078179
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a biotelemetry method for the transmission of bioelectric potential differences, occurring between more than two electrodes applied on a patient, from the patient to an evaluator that is intended and designed for processing and recording bioelectric potential differences, the transmission of the signals between the patient and the evaluator being effectuated as electromagnetic and particularly optical one-way connection from the patient to the evaluator, while there is no electric connection between the electrodes and the evaluation device, in accordance with the preamble of claim 1, as well as a device for performing this method in an ECG system.
An electrocardiogram (ECG) is the recording of the variation in time of heart action tensions in a living being, in general in a human patient. For further definitions see DIN 13401 (January 1953).
The analysis of the ECG supplies the physician with important data on the heart function of the patient. The ECG signals are picked up at ECG electrodes applied on the patient and arranged at the patient in the usual way for obtaining the so-called standard derivations ("left arm, right arm, left foot, right foot, chest position 1 to 6").
In this process, up to ten cables are connected to the patient, which connect the ECG electrodes with the ECG device, where the ECG signals are processed and recorded. These cables constitute a hindrance to the patient and render the execution of an exercise ECG, for instance if the response of the patient's heart to physical exercise is checked on an ergometer, more difficult: the patient has only very limited possibilities of movement, not least because the ECG electrodes fall off if due to the weight and the stiffness of the cables they are pulled on, or if the patient is moving about violently. Also the psychological strain on the patient, who is linked to a mains operated device via electric leads and who reacts with fear of an electric shock, is not to be disregarded. The effect of this psychological strain can combine itself with the effect of the real physical strain, which subsequently falsifies the examination of the heart function.
For this reason, there exists a need for non-electric and, if necessary, for an immaterial ("wireless") connection between the ECG electrodes applied on the patient and the ECG device: this non-electric connection is to easily replace the usual connection by means of electric leads. In other words, there is a need for a non-electric transmission method for ECG signals adapted to the circumstances of the ECG recording from the ECG electrodes applied on a patient to the ECG device that processes and records the ECG signals.
There is also a need for a device to whose inputs the ECG electrodes applied on the patient are connected in exactly such a way as though they were connected to the ECG device, and whose outputs are connected to the inputs of the ECG device in exactly such a way as though they were the ECG electrodes applied on the patient. By way of this device, customarily designed and arranged ECG electrodes are to be connected with a customary ECG device, the connection having to be non-electric and, if necessary, immaterial.
Under these conditions, it is obvious to devise a connection between the ECG electrodes and the ECG device by means of electromagnetic waves. Such a connection requires a transmitting unit, a transmission link, and a receiving unit. The transmitting unit needs to be carried by the patient, otherwise the patient would be linked with the transmitting unit via electrode cables, which must be rejected as inconsistent and inappropriate. However, evidently the hindrance for the patient to be eliminated is not neutralized, until the transmitting part can be carried easily by the patient. In addition, the transmitting unit must meet the usual requirements in regard to safety of the patient and defibrillation stability (defibrillation is a measure against cardiac flutter or fibrillation). Besides, the considered connection must be able to transmit a grea
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Grogg Fritz
Guggenbuhl Walter
Howell Kyle L.
MEDESE AG
Schaetzle Kennedy J.
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