23results about How to "Reduce Radiation Damage" patented technology

The invention relates to a remote control pelvic fracture reduction system, which comprises a man-machine interaction automatic control unit, more than two servo driving systems and more than two pelvic rotary push-pull devices, and the man-machine interaction automatic control unit interacts through a man-machine interaction interface. A reset path automatic planning strategy is formulated based on an artificial intelligence algorithm of a pelvis unlocking reset path, and then servo driving of a high-precision servo motor is provided by each servo driving system according to the reset path automatic planning strategy; then, the pelvic rotating push-pull devices connected with the pelvic rotating push-pull devices are driven to execute axial displacement push-pull reduction actions in respective directions on the pelvic fracture blocks of the patient, so that cooperative and consistent multi-degree-of-freedom space linkage of the pelvic fracture blocks of the patient is completed, and angular rotation and axial push-pull reduction on a plurality of two-dimensional planes under remote automatic control are realized; intelligent, precise and minimally invasive reduction of serious displacement pelvic fracture is achieved, the access threshold of pelvic fracture treatment is lowered, and meanwhile perspective radiation injuries to medical staff and patients are reduced.

The utility model discloses an applicator accessory which comprises a protection disc, the protection disc is arranged on the side, away from an application source window, of an application source back, and a through hole is formed in the position, corresponding to a threaded hole in the application source back, of the protection disc; one end of the first screw penetrates through the through hole and the threaded hole and then is connected with the application source back, the other end of the first screw is provided with a first internal thread connector in the axial direction, and an internal thread through hole is formed in the middle of the first screw in the radial direction in a penetrating mode. One end of the second screw rod is connected with the internal thread interface or the internal thread through hole so as to realize transverse or longitudinal installation of the second screw rod and the first screw rod, and the other end of the second screw rod is provided with a second internal thread interface along the axial direction of the second screw rod; one end of the third screw is connected with the second internal thread connector, and the other end of the third screw is a screw tail. The application source is simple in structure and convenient to assemble, radiation injury to medical staff in the clinical treatment process can be effectively reduced, safety is improved, and clinical application of the application source in the nuclear medicine department is facilitated.

The ablation catheter adapter comprises a supporting seat, a power coupling plate is arranged on one side of the supporting seat, butt joint holes are formed in the power coupling plate, and the butt joint holes are used for exposing a first power shaft, a second power shaft, a third power shaft and a fourth power shaft outside; the catheter supporting device is arranged on the supporting base and used for containing a control handle, the control handle is connected with an ablation catheter, and the control handle comprises a push button and a bending adjusting wheel; the push button driving device is arranged on the supporting seat, is connected with the first power shaft and is clamped with the push button; the rotary driving device is arranged on the supporting seat, is connected with the second power shaft and is connected with the catheter supporting device; the guide pipe bending adjusting driving device is arranged on the supporting seat and connected with the third power shaft and the bending adjusting wheel; and the guide wire driving device is arranged on the supporting seat and is connected with the fourth power shaft. According to the PFA ablation catheter capable of being remotely controlled, an operator can remotely operate the PFA ablation catheter outside an operating room.

The invention relates to the technical field of cables, and provides a high-temperature-resistant cable for photovoltaic power generation, which comprises a conductor, an insulating layer and a sheath, and further comprises a plurality of shading mechanisms and an air cooling mechanism, the shading mechanisms are used for shading the sheath, each shading mechanism comprises a mounting ring and a shading plate, the mounting ring is detachably connected to the outside of the sheath, and the shading plate is detachably connected to the outside of the sheath. The light shielding plate is mounted on the mounting ring, the light shielding plate is movably arranged on the mounting ring, one end of the light shielding plate is fixedly connected with a connecting plate, the other end of the light shielding plate is provided with a connecting port matched with the connecting plate, the connecting plate is detachably connected to the interior of the connecting port, and the air cooling mechanism is used for conducting air cooling on the sheath and comprises a driving shaft and fan blades. The driving shaft is rotationally arranged on the mounting ring, and the fan blades are fixedly connected to the outer portion of the driving shaft. According to the technical scheme, the problem that a photovoltaic cable in the prior art lacks an active cooling part and is easily damaged in a high-temperature light environment for a long time is solved.

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.

The invention relates to a device and method for evaluating the contact direction and contact force of a double-parameter sensor and a balloon catheter, and the double-parameter sensor comprises a central tube elastomer structure, a packaging material, a multimode optical fiber, and a nanometer silver powder reflection layer. The evaluation device comprises the double-parameter sensor, an optical power generation and data acquisition unit and a computer, and the evaluation method combines an array type optical fiber optical power signal with an LSTM neural network model, excavates the change characteristics of a light intensity signal in time, accurately measures and calculates the nonlinear strain and force borne by the elastomer in real time, and calculates the nonlinear strain and force of the elastomer in real time. Three-dimensional reconstruction is carried out according to the strain and force of the elastomer, and the pushing force and torque of the catheter are correspondingly adjusted directly according to the magnitude and direction of the contact force in the navigation or ablation process, so that the problem that the catheter blindly punctures the blood vessel wall in the navigation process or the pulmonary vein opening is insufficiently blocked in the balloon ablation process is solved, and the safety of an operation is ensured.

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.

The invention relates to the technical field of chip manufacturing, in particular to a carrier lifetime controlled single vacuum chamber wafer proton irradiation device, which comprises an irradiation vacuum chamber body, and an irradiation vacuum chamber front chamber door is arranged at the left end of the irradiation vacuum chamber body; a wafer storage unit is arranged on the left side of an inner cavity of the circular vacuum irradiation cabin, a beam irradiation unit is arranged on the right side of the inner cavity of the circular vacuum irradiation cabin, and a plurality of wafer trays are stored in the wafer storage unit; an irradiation conveying mechanism is further arranged in the middle of the inner cavity of the irradiation vacuum chamber body and used for moving the wafer trays from the wafer storage unit to the beam irradiation unit and moving the wafer trays back to the wafer storage unit from the beam irradiation unit. The method has the beneficial effects that the service life of a local carrier of the chip can be controlled, the irradiation depth can be accurately controlled, the accuracy can reach + / -1mu m, and the batch, automation, high efficiency and high safety of the irradiation process are realized.

According to the collimator control method and device in the spiral scanning mode, the equipment and the medium provided by the embodiment of the invention, the method comprises the steps that scanning parameter data corresponding to a target object are acquired, and the scanning parameter data comprise the scanning length, the reconstruction view field and the depth information of an image to be reconstructed; determining scanning space range information of the target object according to the scanning parameter data; the control strategy of a collimator is determined according to the scanning space range information, the position information of the scanning module and the moving direction of the scanning bed, the scanning module comprises an X-ray light source, the collimator and a detector, the collimator comprises a first collimation blade and a second collimation blade, and the detector comprises a first collimation blade and a second collimation blade; the position information of the scanning module comprises a focal brake distance, a focal point isocenter distance, a focal point detector distance, an X-ray light source width and a collimator opening degree. The absorption of invalid dose by a scanned person is saved to the maximum extent, and then the irradiation damage to the scanned person is reduced.

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.

The invention discloses an intelligent high-frequency arc striking circuit which comprises an MCU, a charging control circuit, a discharging control circuit and a high-frequency inductor. The MCU is used for sending a charging control signal and a discharging control signal; the charging control circuit is connected with the MCU and is used for receiving and processing the charging control signal; the discharge control circuit is connected with the MCU and is used for receiving and processing the discharge control signal; a terminal 1 of the high-frequency inductor is connected with the charging control circuit, a terminal 2 of the high-frequency inductor is connected with the discharging control circuit, and terminals 3 and 4 of the high-frequency inductor are connected with an output main loop of an external electric welding machine. According to the invention, the frequency and voltage control of the high-frequency and high-voltage arcing circuit can be adjusted, different working frequencies and working voltages can be selected according to different use conditions, high-frequency interference can be effectively reduced, and radiation damage to human bodies can be reduced.

The utility model discloses a kind of repair cutters of reactor pressure vessel screw hole thread, comprising: with the base plate component of positioning installation of to-be-repaired screw hole, is equipped with middle positioning hole;It is equipped with the measuring ring of circumferential scale, with base plate component fixed connection, and with middle positioning hole centring arrangement;Tool-path component, insert middle positioning hole, and with measuring ring screw joint to adjust the height position and circumferential position of tool-path component relative to to-be-repaired screw hole;Cutting component, with tool-path component connection and follow tool-path component movement to mill the defect position of to-be-repaired screw hole.By rotating tool-path component relative to measuring ring rotation and lifting to adjust the advance of cutting component, while cutting component is cleaned to damaged screw hole thread, base plate component realizes overall positioning, measuring ring facilitates operator to control the feed speed of tool-path component, ensure the controllability of repair process.The repair efficiency of the utility model is high and effect is good, can reduce personnel exposure time, reduce personnel irradiation injury.

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.

The utility model relates to the field of auxiliary accessories for cervical cancer radiotherapy. The utility model discloses a fixing foot pad for fixing the body position in cervical cancer radiotherapy, which comprises a bottom of a cuboid structure, the length direction of the bottom is defined as the left-right direction, the left end part and the right end part of the top surface of the bottom are respectively provided with a left protective wing part and a right protective wing part which extend upwards, and the middle part of the top surface of the bottom is provided with a baffle part which extends upwards. The left / right protective wing part and the partition part are arranged at intervals to form two placement grooves which are arranged at intervals in the left-right direction, the placement grooves are used for placing shank parts, close to ankles, of a patient, and the partition part is higher than the left / right protective wing part. According to the utility model, the body position fixing cost of a patient can be reduced; for a cervical cancer patient, as a treatment center is marked on the skin, the skin cannot be extruded and deformed, the body position repeatability is good, the radiotherapy target region accuracy is high, and radiation injury is reduced; the use is fast and simple, the positioning preparation time of the patient is reduced, and the use efficiency of the radiotherapy accelerator is improved.

The present application relates to a 2D-3D medical image registration method, device, computer equipment and storage medium. The method includes: obtaining a preoperative CT image and an intraoperative X-ray image of a target bone block, inputting the preoperative CT image and the intraoperative X-ray image into a regression network based on deep learning, and roughly estimating the initial spatial pose of the target bone block through the regression network; adjusting the projection of the preoperative CT image based on the initial spatial pose to generate a DRR image; inputting the DRR image, the intraoperative X-ray image and the preoperative CT image into a pre-trained corresponding point relationship estimation network, estimating the feature point correspondence between the DRR image and the Xray image through the corresponding point relationship estimation network, optimizing the initial spatial pose of the target bone block according to the feature point correspondence, and obtaining the optimized spatial pose. The present application does not require manual annotation of a large amount of data, greatly reduces the radiation damage caused by repeated perspectives, and can achieve relatively efficient and accurate registration.

The invention discloses a novel low-afterglow scintillator single crystal and a preparation method thereof, and belongs to the technical field of materials. A novel scintillator CsCu2Br3 single crystal is prepared through a cooling crystallization method for the first time. The specific preparation method comprises the steps that CsBr and CuBr are put into a crystal growth bottle, and a hypophosphorous acid solution and a hydrobromic acid solution are sequentially added; the preparation method comprises the following steps: preparing a precursor solution, then sealing the solution, then putting the solution into an oil bath pan, setting the temperature to 90 DEG C for 24 hours, and then carrying out three-stage gradient cooling, in the first stage, rapid cooling is that the temperature of the precursor solution is reduced to 66 DEG C from 90 DEG C within 10 hours; in the second stage of extremely slow cooling, the temperature of the precursor solution is reduced to 60 DEG C from 66 DEG C at the speed of reducing 2 DEG C every day; in the third stage, the temperature of the precursor solution is reduced to 55 DEG C from 60 DEG C at the speed of reducing 2.5 DEG C every day until the growth of the crystal is finished, and then the crystal is put into a vacuum drying oven to be subjected to constant-temperature drying treatment for 24 hours to finally prepare the CsCu2Br3 centimeter-level single crystal with fewer nucleation points and better seed crystals, and the prepared CsCu2Br3 single crystal has the characteristic of low afterglow, and can be used for preparing the CsCu2Br3 centimeter-level single crystal. The method can be applied to the fields of X-ray imaging and CT imaging.

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.