Coil protection device used in high-frequency encapsulation technological process of flexible magnetic resonance radio-frequency coil
A radio frequency coil and coil protection technology, which is applied in the field of protection devices, can solve the problems of difficult control, low yield rate of high-frequency welding plastic film of flexible magnetic resonance radio frequency receiving coil, and reduced product scrap rate, so as to solve the problems of difficult control and protection Effective and reliable, the effect of reducing product scrap rate
Active Publication Date: 2011-06-01
SHANGHAI CHENGUANG MEDICAL TECH
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Problems solved by technology
[0008] In order to solve the problem that the high-frequency welding yield of the plastic film of the flexible magnetic resonance radio frequency receiving coil is not high at present, the present invention uses the radio frequency floating drive protection technology, by setting a common mode suppressor, using a battery-powered drive circuit and connecting the coil circuit Into the drive circuit, successfully solved the technical problem that the welding electromagnetic wave stray field is difficult to control, reduced the coupling between the coil circuit and the welding mold during the welding process, made the protection of the coil circuit more effective and reliable, and the product scrap rate caused by the packaging process was greatly increased. reduce
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[0017] The present invention will be further described below in combination with the accompanying drawings and specific embodiments.
[0018] Such as figure 1 As shown, the existing coil packaging process consists of six components: welding mold 1 , coil 2 , preamplifier 3 , cable 4 , drive circuit 5 and working platform 6 . Among them, the coil, preamplifier and cable become a complete part after packaging, which is used for the final assembly of the entire receiving coil; the welding mold, driving circuit and working platform constitute the tooling and fixture of the packaging process for continuous packaging production. During welding, the high-frequency electromagnetic waves applied between the welding mold and the working platform are converted into heat energy and act on the edge of the plastic film wrapped around the coil, pre-amplifier and cable, so that the part of the plastic is welded together.
[0019] However, during the welding process, high-frequency electromag...
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The invention discloses a coil protection device used in a high-frequency encapsulation technological process of a flexible magnetic resonance radio-frequency coil. By arranging a group of common mode rejectors on a connection cable between an encapsulation drive circuit and a coil and connecting a drive loop and an encapsulation circuit powered by a battery to the two ends of a diode of a coil resonance loop, the welding power coupled to a product is effectively controlled, thus the product safety in the welding process is ensured, the technical problem that the stray field of welding electromagnetic wave is not easy to control is successfully solved, and coupling between a coil circuit and a welding mould in the welding process is reduced, so that protection on the coil circuit is more effective and more reliable and the product rejection rate caused by the encapsulation process is greatly reduced.
Description
technical field [0001] The invention relates to a protection device for protecting the coil from being damaged by high-power radio-frequency electromagnetic waves during the high-frequency packaging production process of a flexible magnetic resonance radio-frequency receiving coil. Background technique [0002] Magnetic resonance imaging (MRI) is an application of nuclear magnetic resonance (NMR) in medicine. The main magnetic system of the magnetic resonance imaging system produces a uniform strong magnetic field (called the main magnetic field of the MRI system—B 0 ). The hydrogen nuclei in the human body are in B 0 Spin polarization occurs under the field. The magnetically polarized hydrogen nucleus spins generate a magnetic moment i in the human body. in the absence of B 0 In the case of excitation by an external magnetic field other than , the magnetic moment is in a steady state, and the direction and the main magnetic field B 0 Orientation is coaxial and yields ...
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IPC IPC(8): B29C65/04
Inventor 轶楠
Owner SHANGHAI CHENGUANG MEDICAL TECH