Implanted electrode compatible with MRI

Abstract

The invention provides an implanted electrode compatible with MRI. The implanted electrode comprises an electrode conduit, the far end of the electrode conduit is provided with at least one contact, and the near end of the electrode conduit is provided with at least one connector. The connector is connected with one or more contacts through a wire arranged in the electrode conduit. A net-shaped shielding layer with the biocompatibility is arranged outside the electrode conduit to form shielding protection on the wire in the electrode conduit, the induced current generated by the wire under the activation of a radio frequency magnetic field in the MRI is weakened, and therefore the electrode contacts can be prevented from being heated. The two ends of the net-shaped shielding layer are provided with packing rings directly connected with the net-shaped shielding layer. A detecting loop can be formed by the net-shaped shielding layer, the packing rings at the two ends of the net-shaped shielding layer, the connector, the biological tissue and a controller, and a measuring circuit is arranged in the controller and is capable of measuring the impedance at the two ends of the detecting loop and being used for assessing the integrity of the shielding layer.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and in particular relates to an implantable electrode capable of weakening the influence of MRI scanning on the MRI scanning environment. Background technique [0002] Compared with other imaging techniques (such as X-ray, CT, etc.), magnetic resonance imaging (Magnetic Resonance Imaging, MRI) has significant advantages: magnetic resonance imaging is clearer, has a high resolution of soft tissues, and There is no ionizing radiation damage to the human body. Therefore, magnetic resonance imaging technology is widely used in the clinical diagnosis of modern medicine. Today, it is estimated that at least 60 million cases worldwide are examined using MRI technology every year. [0003] When MRI works, three magnetic fields come into play. A high-intensity uniform static magnetic field B0, a gradient magnetic field that can be adjusted to any direction, and a radio frequency (RF) magnetic f...

AI Technical Summary

Problems solved by technology

Designing the electrode wire with high impedance can weaken the RF induced current, but at the same time it will limit the function of the electrode wire itself; arranging an LC resonant filter at the interface of the electrode contact / wire can reflect the RF induced current and prevent it from flowing into human tissue , but this will increase the current intensity of the resonant filter and the wire itself, resulting in a temperature rise of the resonant filter and the wire itself, and even melt the electrode catheter in severe cases

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