11results about How to "Reduce Radiation Damage" patented technology

This invention relates to a method and system for treating interface contaminants in a mixing and clarification tank, belonging to the field of nuclear fuel reprocessing. The method involves conveying interface contaminants to the final stage mixing and clarification tank via top-tank operation, separating the organic phase, and then returning the liquid containing interface contaminants from the final stage mixing and clarification tank to the organic phase inlet of the first stage mixing and clarification tank. The interface contaminants are dispersed by the agitation of the pump impeller within the mixing and clarification tank, thereby redissolving radioactive materials in the liquid. This invention utilizes in-situ treatment of interface contaminants and recovery of radioactive elements in a mixing and clarification tank, significantly reducing the accumulation of radioactivity in interface contaminants, mitigating radiation damage from organic solvents, and is simple to operate without requiring additional treatment equipment.

This invention relates to the field of medical device technology, specifically to an abdominal aortic aneurysm stent-assisted positioning device, comprising: an outer sheath; an inner tube and a positioning component coaxially sleeved inside the outer sheath; the proximal ends of the outer sheath and the inner tube being connected to maintain relative alignment between them; the positioning component being sleeved around the outer periphery of the inner tube and capable of sliding between the outer sheath and the inner tube; a through-hole being provided in the center of the inner tube, through which a guidewire can pass and slide within the inner tube. The abdominal aortic aneurysm stent-assisted positioning device provided by this invention has a simple structure and is easy to operate. It can effectively assist in locating the opening of the short iliac branch of the main stent in the abdominal aortic aneurysm cavity, improve the docking efficiency between the short iliac branch of the main stent and the extended iliac branch stent, reduce surgical time and risk, and decrease radiation damage.

The tongue cancer patient radiotherapy tongue depressor structure belongs to the technical field of tongue cancer radiotherapy auxiliary instruments, and comprises a lip baffle and a bite plate. A cooperative positioning mechanism is installed on the side of the bite plate away from the lip baffle. The cooperative positioning mechanism comprises a tongue depressor and two connecting plates fixedly connected to the bite plate. The tongue depressor structure can standardize the opening angle of the patient's oral cavity and standardize the extension position of the patient's tongue, effectively avoiding the problems of tongue micro-motion and body position deviation during the whole radiotherapy process, and ensuring the accuracy and repeatability of radiotherapy positioning. The first drainage tube and the second drainage tube can accurately aspirate sputum and saliva in the patient's oral cavity, prevent sputum and saliva accumulation from inducing stress reactions such as tongue micro-motion and involuntary swallowing, eliminate problems such as tongue displacement and target deviation during radiotherapy, and improve the accuracy of radiotherapy, treatment safety and patient comfort.

The invention relates to the technical field of medical instruments, in particular to an abdominal aortic aneurysm cavity support auxiliary positioning device. An inner tube and a positioning assembly are coaxially arranged in the outer sheath tube in a sleeving manner; the outer sheath tube is connected with the near end of the inner tube, so that the relative positions of the outer sheath tube and the inner tube can be kept consistent; the positioning assembly is arranged on the periphery of the inner tube in a sleeving mode and can slide between the outer sheath tube and the inner tube. A penetrating through hole is formed in the center of the inner tube, and a guide wire can penetrate through the penetrating through hole and slide in the inner tube. The auxiliary positioning device for the abdominal aortic aneurysm cavity support is simple in structure, easy and convenient to operate and capable of effectively assisting in positioning a main body support short iliac branch opening in an abdominal aortic aneurysm cavity, the butt joint efficiency of the main body support short iliac branch and an iliac branch extension support is improved, the operation time is shortened, the operation risk is reduced, and ray damage is reduced.

The invention discloses a characterization method of a microstructure and phase distribution of a lithium-rich manganese-based positive electrode material based on a 4D-STEM technology. According to the method, through a specific sample preparation process, 4D-STEM data acquisition parameter setting, multi-dimensional data processing and crystallographic information reconstruction, characterization of the intrinsic microstructure of the lithium-rich manganese-based positive electrode material with low damage, high spatial resolution and reliable statistics is realized. According to the method, the solid solution and the two-phase / nano-composite structure model can be clearly distinguished, phase distribution, lattice strain and an interface structure can be accurately represented, the limitation of a traditional representation means in structural analysis of the material is solved, and a key technical support is provided for structure-activity relationship research and performance optimization of the lithium-rich manganese-based positive electrode material.

This invention discloses an irradiation device and a method for testing the performance of radiation detectors and scintillation crystals. The irradiation device includes a housing with several horizontally arranged partitions inside, spaced vertically to divide the housing into several chambers. Each chamber contains an irradiation unit. Each irradiation unit includes a rotating mechanism with a placement slot for placing a radiation source. The rotating mechanism is horizontally rotatable. An operating port is provided on one side wall of the housing, allowing the placement slot to extend out of the housing after the rotating mechanism rotates at a certain angle, facilitating the replacement of the radiation source within the placement slot. The bottom plate of the housing and all partitions have collimation holes corresponding to the placement slots, ensuring that the placement slots are positioned directly above the collimation holes after the rotating mechanism rotates, and all collimation holes are aligned on the same straight line. This invention can be used for scintillation crystal performance testing, radiation detector calibration, and scaling experiments, and can effectively reduce radiation damage to workers.

This application provides a heterogeneous multi-interface ultrafine-grained high-entropy alloy composite coating and its preparation method. The preparation method includes: (1) cold spraying heterogeneous multi-interface ultrafine-grained high-entropy alloy composite powder onto the surface of a substrate to prepare an ultrafine-grained high-entropy alloy composite coating; (2) heat-treating the ultrafine-grained high-entropy alloy composite coating under a protective atmosphere to obtain a high-performance heterogeneous multi-interface ultrafine-grained high-entropy alloy composite coating; wherein, the heterogeneous multi-interface ultrafine-grained high-entropy alloy composite powder is a composite powder with a heterogeneous multi-interface structure in which high-entropy alloy / refractory metal heterogeneous phase boundaries and ultrafine grain boundaries coexist. This application constructs an ultrafine-grained composite powder with abundant heterogeneous multi-interfaces, and then uses cold spray solid deposition to completely preserve its fine structure, thereby obtaining a heterogeneous multi-interface ultrafine-grained high-entropy alloy composite coating material with ultra-high strength, good ductility and toughness, and multi-functional service characteristics.

This application discloses a method, apparatus, and testing equipment for detecting the operating status of a ventricular assist device (VAD), belonging to the field of medical device technology. The VAD includes a drive device and an interventional pump. The drive device drives the interventional pump. The method includes: acquiring current data of the drive device in its operating state; when the current data indicates an increase in the load on the drive device, classifying and identifying the operating status of the VAD based on the changes in the current data over a first time period; and issuing an alarm message corresponding to the identification result, whereby the identification result indicates an abnormal operating state causing the increased load. This method, without relying on medical imaging equipment, promptly indicates the cause of the abnormal load increase, achieving automatic identification of abnormal operating states, reducing safety risks and protecting the life of the patient, and reducing radiation damage to the human body from the operation of medical imaging equipment.

The invention discloses a multi-energy-level multi-machine-head dose optimization method, device and equipment and a storage medium, and the method comprises the steps: setting a machine head included angle and an irradiation mode based on target region distribution, and determining a radiation field set; aiming at each radiation field, based on ray path organization characteristics of the radiation field, by calculating correlation between a percentage depth dose curve and ideal dose distribution, screening an optimal irradiation energy level; calculating a dose deposition matrix based on the optimal energy level of each radiation field, and constructing an optimization model to perform joint optimization on all radiation field intensity graphs; segmenting the optimized intensity distribution, calculating an actual delivery dose, reducing the difference between the actual delivery dose and an ideal dose through iterative optimization, and finally outputting a dose optimization parameter. According to the invention, through combination of multi-machine-head cooperative irradiation and multi-energy-level adaptive selection, the treatment efficiency is significantly improved, and the dose distribution is optimized.

The invention relates to the technical field of radiopharmaceuticals and medical imaging, in particular to an STING-targeted precursor compound, a nuclide marker, a preparation method and application of the STING-targeted precursor compound, a nuclide marker, a pharmaceutical composition and application of the pharmaceutical composition. The STING targeting precursor compound, the pharmaceutically acceptable form of the STING targeting precursor compound, the nuclide marker of the STING targeting precursor compound and the pharmaceutically acceptable form of the STING targeting precursor compound have excellent in-vivo biological performance, can have high specific uptake in tumors or inflammations with high expression of interferon stimulating factors STING, has a high target-to-non-target ratio, and can be used for preparing the target-to-non-target tumor marker of the STING targeting precursor compound and the nuclide marker of the STING targeting precursor compound and the pharmaceutically acceptable form of the STING targeting precursor compound and the nuclide marker of the STING targeting precursor compound. And the non-specific background is low, and unnecessary radioactive injury can be reduced by lower non-target visceral organ uptake, so that the medication safety is high.