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75results about How to "Improve clinical utility" patented technology

Magnetic resonance angiography method and magnetic resonance angiography system

The invention discloses a magnetic resonance angiography method. The magnetic resonance angiography method includes applying a flowing sensitive dispersed phase gradient magnetic field in the readout direction and / or the phase encoding direction and / or the layer selection direction in a vasoconstriction period and then applying a residual magnetic moment removing gradient magnetic field after the flowing sensitive dispersed phase gradient magnetic field is applied; collecting blood flow images in the vasoconstriction period; collecting blood flow images in a vasodilatation period; and carrying out subtraction on the blood flow images in the vasoconstriction period and the blood flow images in the vasodilatation period to obtain blood flow images. The invention further discloses a magnetic resonance angiography system. According to the magnetic resonance angiography method and the magnetic resonance angiography system, in the specific implementation method, the flowing sensitive dispersed phase is used in the vasoconstriction period imaging process, so that intra-arterial self-spin dispersed phase can significantly lower arterial blood signals, and therefore the influence on imaging due to the velocity and the direction of blood flow can be reduced, high-quality peripheral arterial images can be obtained, and clinical practicability of the non-enhanced magnetic resonance angiography technology is improved.
Owner:SHENZHEN INST OF ADVANCED TECH

Spinal surgery minimally invasive surgery navigation system

The invention relates to a spinal surgery minimally invasive surgery navigation system. The spinal surgery minimally invasive surgery navigation system comprises an imaging portion, a treatment portion, and a navigation portion, wherein an imaging portion scanner performs scaning and imaging around a treatment object; the treatment portion includes a mechanical arm, a connecting rod, a power supply unit, a clipper, a puncture channel into a lesion of a spinal column, and an ablation electrode needle. The puncture channel is a minimally invasive surgical working cannula having a diameter of about 2 mm. The system has the advantages of simple structure, low cost and easy operation, and the CT and MRI images are combined to integrally reconstruct the intervertebral disc tissues of the patient's bone structure, nerves, blood vessels and compression nerves as well as the ligament before the surgery, according to the position of protrusion of intervertebral disc and the nerve compression, areasonable surgical approach is designed before the surgery, and the intraoperative scanning bone image is registered, a robot arm is remotely controlled to accurate ablate the compression nerve tissue through real-time navigation, and the safety and stability are good. The system avoids damage to normal tissues caused by doctor fatigue during surgery and effectively reduces the damage of radiation to patients and doctors.
Owner:吕海 +2

Manufacturing method of functional area tooth preparation guide plate and detachable drill limiter

The invention relates to a manufacturing method of a functional area tooth preparation guide plate and a detachable drill limiter. The method comprises the following steps that a tooth required to besubjected to tooth preparation and adjacent teeth are scanned; the three-dimensional shape of a tooth preparation body is designed by using three-dimensional reverse engineering software; a guide groove capable of guiding the motion path of a dental drill in the whole process in the key functional area preparation process is designed in the guide plate; the dental crown data surfaces of the adjacent teeth are each thickened to be a thin wall with the thickness of 1-4 mm; the guide plate is machined into an entity through a three-dimensional printer or numerical control machining equipment; thedetachable drill limiter is designed to be matched with a hemispherical groove in the top of the guide plate; and after the guide plate is completely in place on a dentition model, accurate tooth preparation of the corresponding area can be completed according to the designed tooth preparation amount. According to the method, the accuracy and efficiency of tooth preparation of the key functionalareas such as the axial surface, the edge, the guide plane (the tooth preparation guide plate is shown in the description) and a jaw support fossa of a base tooth in the fixed repair and removable repair process can be improved, and popularization and application can be facilitated.
Owner:PEKING UNIV SCHOOL OF STOMATOLOGY +1
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