An improved electrocardiograph cable and its preparation method

Abstract

This application relates to the field of cable manufacturing, in particular, to an improved electrocardiograph cable and its preparation method, which sequentially includes a conductor 1, a semiconductive shielding layer 2, an insulating layer 3, an outer shielding layer 4 and an outer shielding layer from inside to outside. The sheath 5; the semiconductive shielding layer 2 is a semiconductive adhesive mixture; the conductor 1, the semiconductive shielding layer 2 and the insulating layer 3 form a conductive wire core, and the conductive wire core contained in it is at least a single core, at most 50 cores; the semi-conductive adhesive mixture is made of raw materials containing the following parts by weight: 25-35 parts of conductive magnetic permeability agent powder; 8-10 parts of thermoplastic acrylic resin; 36-48 parts of surfactant; 13-17 parts of retaining agent; 17-25 parts of solvent; the conductive and magnetic-permeable agent powder is made by uniformly mixing raw materials containing the following parts by weight: 12.5-17.5 parts of ultra-fine silver-plated copper powder; ultra-fine nickel-coated copper powder 12.5‑17.5 parts. The ECG weak signal transmitted by the advanced electrocardiograph cable in the present invention is not easily disturbed by internal and external factors, which is beneficial to ensure signal fidelity.

Description

technical field [0001] The present application relates to the field of cable manufacturing, and more specifically, it relates to an improved electrocardiograph cable and a preparation method thereof. Background technique [0002] The electrocardiograph cable is an electronic component that transmits the physiological electrical activity of heart cells collected by the sensor to the receiver in the electrocardiograph. The generation, interpretation, diagnosis and treatment of diseases are very important. [0003] An electrocardiograph usually has 1 lead, 3 leads, 6 leads, 12 leads and up to 50 channels. The connection between internal and external components such as amplifiers, processors, computers, printers, and the connection between the whole machine and the external network system must use signal signals. For transmission cables, the structure of traditional cables is roughly the same, that is, single-core or multi-core insulated wires plus shielding and outer sheath. ...

AI Technical Summary

Problems solved by technology

[0004] The core wire of a traditional cable is usually made of 7 or more strands of bare copper or tinned copper strands twisted together with an insulating layer. However, the outer surface of the twisted wire has many bumps. First, it is easy to cause tip discharge and signal attenuation Second, the vibration and cable bending during the use of the instrument often cause intrinsic static noise due to slipping and friction between the conductor and the insulation, which reduces the signal-to-noise ratio. Third, multiple core wires transmit ECG at the same time. signal, and the fluctuation frequency, amplitude, phase and wave speed of the signal transmitted by each core wire are different from each other, and the electromagnetic wave radiation generated by it is easy to cause crosstalk to adjacent core wires. In short, the core wire structure above the traditional cable Increased difficulty in parsing authentic signals

[0005] The outer conductor shielding layer of traditional cables is usually double-layer, the inner layer is aluminum-plastic composite film, and the outer layer is braided with bare copper or tinned copper wire. The inner layer is mainly used for high-frequency electric field shielding, and the outer layer is mainly used for low-frequency magnetic field shielding. Function, the inner and outer layers jointly shield the interference from the internal and external electromagnetic fields; but in fact, after the cable is made into a finished product, in the use of medical staff, the aluminum-plastic composite film is broken after being bent and wrinkled many times by the cable, and the existence of the fracture causes Conductance discontinuity and shielded high-frequency wireless electromagnetic waves penetrate through the gap from the external space to the inside of the cable to cause interference and distortion of the ECG signal. Therefore, the external objects to be shielded should be low-frequency (0-1kHz) electromagnetic waves, and it is best to use high-permeability materials to form a low-reluctance path for magnetic shielding, while the outer shielding layer of traditional cables usually uses oxygen-free copper wire as a good conductor, while Good conductors have low shielding efficiency for low-frequency magnetic fields, and at the same time, electromagnetic waves generated by external low-frequency interference sources (such as AC power lines, transformers, indoor appliances, lighting circuits, etc.) easily penetrate the copper metal braided shielding layer, thus affecting the weak current transmitted by the internal core wire. Signal interferes

It can be seen that the structure design of the traditional cable is not thorough, and there are some technical defects in the shielding material. It is difficult to achieve the best effect for the signal transmission of the electrocardiograph.

[0006] In view of the related technologies mentioned above, the present invention considers that in the actual application of the electrocardiograph cable, the weak signal transmitted by it is easily interfered, and it is difficult to ensure the fidelity of the signal

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