208 results about "Pantomography" patented technology

The invention discloses a cardiovascular intervention catheter storehouse scheduling system based on demand analysis, and relates to the technical field of medical informatization, and the system comprises a data collection module which is used for obtaining an operation plan, a doctor identifier, a step sequence and an angiography image; the feature extraction module is used for generating a situation feature vector according to the contrast image; the standard deduction module is used for deducing subsequent steps and corresponding catheter sets; the selection probability calculation module is used for querying a doctor preference knowledge base in combination with the doctor identifier, the step code and the feature vector to obtain catheter selection probability distribution; the first judgment module is used for outputting a predicted catheter model if the catheter selection probability exceeds a first threshold value, otherwise, counting the catheter use frequency of the historical data of the doctor; the second judgment module is used for outputting the corresponding catheter model if the use frequency exceeds a second threshold value, otherwise, determining a predicted catheter model from the standard catheter set according to a rule; the accuracy and clinical suitability of catheter prediction can be improved.

The invention discloses an intracranial anterior artery circulation functional evaluation method and device, computer equipment and a storage medium, and relates to the field of vascular function evaluation, and the method comprises the steps: based on an intracranial angiography image and near-end pressure data, carrying out the five working processes of data input, blood vessel segmentation and segmentation, boundary condition calculation, hemodynamic simulation and functional parameter calculation; according to the method, functional parameters verified in the coronary artery field are migrated to intracranial blood vessel evaluation without additional equipment, the clinical problem that traditional morphological evaluation is not matched with functionality is solved, individualized function quantification is achieved by integrating blood vessel morphological characteristics and hemodynamic simulation, and the method is suitable for being applied to intracranial blood vessel evaluation. According to the method, an objective basis is provided for cerebrovascular disease diagnosis and treatment, the intracranial vascular disease is promoted to be converted from anatomy orientation to function orientation, the clinical decision accuracy is remarkably improved, popularization and application of functional evaluation in the field of neural intervention are accelerated, and construction of a cerebrovascular disease accurate diagnosis and treatment system is assisted.

The invention belongs to the technical field of DSA, and discloses a DSA platform-based multi-state real-time multi-mode image accurate fusion method. After an angiography image is collected on the basis of DSA equipment under the motion condition, accurate DSA blood vessel subtraction image enhanced display is achieved, meanwhile, hepatic artery extraction in a three-dimensional image in preoperative CT is completed, dynamic intelligent fusion of a precise anatomical structure in a preoperative multi-mode CT image and intraoperative local blood vessel development is combined, and the dynamic and intelligent fusion of the dynamic and intelligent fusion of the dynamic and intelligent fusion of the dynamic and intelligent fusion of the dynamic and intelligent fusion of the dynamic and intelligent fusion of the dynamic and intelligent fusion of the dynamic and intelligent fusion is achieved. The intrahepatic lesions and important blood vessels are accurately and visually displayed, operation planning is completed, fusion of three-dimensional information and two-dimensional DSA is utilized, and transvascular and percutaneous interventional operations are accurately guided.

The invention provides a multi-mode ultrasonic monitoring method for degradation of a PFO degradable plugging device, and relates to the technical field of cardiovascular ultrasonic medical treatment. The multi-mode ultrasonic monitoring method for degradation of the PFO degradable occluder aims to overcome the technical defects that in the prior art, a single ultrasonic mode cannot achieve degradation progress quantification of the occluder, precise identification of residual shunt and evaluation of the integration degree of surrounding myocardial tissue at the same time. According to the method, three modalities of real-time three-dimensional transthoracic ultrasound (RT-3D TTE), ultrasonic contrast (CEUS) and shear wave elastography (SWE) are cooperatively applied, the form, hemodynamics and tissue elasticity data of the occluder are collected in stages, non-invasive, dynamic and accurate monitoring of the whole degradation process of the occluder is achieved in combination with preset quantitative indexes, and a reliable basis is provided for clinically adjusting a treatment scheme.

A method, system, device and storage medium for measuring and classifying CT-FFR, dividing lesions into different types according to coronary artery computed tomography angiography (CCTA) images, determining lesion lengths at lesion positions according to different lesion types, and determining the lesion lengths at the lesion positions according to different lesion types. Then, the measurement range of computed tomography fractional flow reserve is determined according to the focus lengths of different lesion types, a statistical matrix is established to calculate the numerical values of all computed tomography fractional flow reserve CT-FFR in the measurement range, and finally, hemodynamic classification is conducted on calculation results. According to the CT-FFR evaluation method, the accuracy and the stability of CT-FFR evaluation are enhanced by carrying out pathological change specificity classification on the pathological change in the haemodynamics sense, interference is reduced, and a more reliable solution is provided for clinicians and patients.

The invention belongs to the technical field of medical instruments. In order to solve the problem that an existing device is tedious in operation, the multifunctional automatic injection system is designed and comprises an injector, an automatic injection device and an auxiliary Y valve, and the auxiliary Y valve is connected with a catheter, a guide wire and the automatic injection device. Therefore, the automatic injection device can inject the contrast agent, the medicine or the embolic agent in the injector, the contrast or treatment efficiency is improved, meanwhile, the guide wire can be rapidly fixed, the guide wire does not need to be completely withdrawn out of the catheter, the surgical operation difficulty is reduced, and the surgical time is shortened.

A computer-implemented method of processing repeat B-scans of an imaged region of a body part, the imaged region including an anatomical feature in a first subregion and vasculature of interest in a second subregion of the imaged region, to generate cropped B-scans for use in generating OCT angiography data which provides a representation of the vasculature of interest, the method comprising processing each B-scan of the repeat B-scans by: selecting a subset of the data elements of the B-scan such that the selected data elements are distributed along a representation of the anatomical feature in the B-scan; using the selected data elements to define a respective subregion of interest in the B-scan, which includes OCT data acquired from the second subregion containing the vasculature of interest; and cropping the B-scan to leave the subregion of interest in the B-scan.

This application relates to the field of medical devices and discloses a thrombectomy device, including a control handle, a catheter, and a thrombectomy assembly. The proximal end of the catheter is connected to the control handle, and the catheter has a suction chamber. The thrombectomy assembly includes a thrombectomy structure, a driven component, and a rotating component. The thrombectomy structure passes through the suction chamber, with its distal end located on the distal side of the suction chamber. The proximal end of the thrombectomy structure is connected to the driven component, which is located within the control handle and detachably connected to the rotating component. This thrombectomy device can effectively remove thrombi and reduces the time required for instrument replacement and re-angiography, improving surgical efficiency and reducing surgical risks.

The invention belongs to the technical field of medical ultrasonic diagnosis auxiliary equipment, and discloses an electric right heart acoustic radiography foaming device which comprises a device body, the device body comprises a base, a mounting plate is fixedly arranged on the rear side of the base, a driving assembly is arranged on the front side of the mounting plate, and the driving assembly comprises fixing frames fixed to the upper side and the right side of the mounting plate; a stepping motor is fixedly arranged at the top of the fixing frame, a ball screw is fixedly arranged at the tail end of a main shaft of the stepping motor, a sliding block is spirally arranged on the outer side of the ball screw in a sleeving mode, and a connecting rod is fixedly arranged at the bottom of the sliding block, so that accurate controllability of power transmission and visual adjustment of parameters in the contrast agent injection process are achieved; specifically, key parameters such as injection speed and dosage can be accurately set through the operation panel, a traditional manual injection mode is replaced, and the stability of the foaming effect of the contrast agent is guaranteed.

The application relates to the field of medical image assisted ablation technology, and provides a thyroid nodule ablation control system based on ultrasound contrast parameters. The system comprises an ultrasound data acquisition module, a contrast parameter analysis module, a blood supply identification module, an ablation strategy generation module, an ablation execution module, a feedback evaluation module, a closed-loop control module and an energy optimization module. By acquiring an ultrasound contrast image of target tissue, perfusion time, perfusion intensity and perfusion sequence parameters are extracted, blood supply arteries or blood supply areas are identified, and a phased ablation strategy is generated, the blood supply area is preferentially ablated, and then main ablation is carried out on the target tissue; at the same time, residual active areas are detected based on contrast feedback, and supplementary ablation is carried out through a closed-loop control mechanism; and ablation parameters are dynamically optimized in combination with a unit volume energy model. The system can improve ablation integrity, reduce the heat sink effect and the risk of intraoperative bleeding, reduce the recurrence rate, and improve energy utilization efficiency.

The invention discloses a system and a method for detecting branch blood flow disorder in coronary artery bifurcation lesion interventional therapy. The system comprises a physiological signal acquisition unit, an angiography unit, a coronary intravascular ultrasound unit, a data processing and control unit and a display unit. The method is realized through the following steps: calculating baseline functional indexes and extracting baseline morphological parameters based on radiography and vascular ultrasound images before an operation; the method comprises the following steps: synchronously acquiring real-time radiography and ultrasonic images before and after key steps in an operation, and calculating real-time functional indexes and real-time morphological parameters according to the real-time radiography and ultrasonic images; fusing the real-time data with the baseline data, and calculating a comprehensive damage index; and according to whether the index exceeds a preset threshold, generating a graded early warning signal in real time. According to the method, image data which can be conventionally obtained in an operation is utilized, real-time fusion and quantitative evaluation of function and form information are achieved, objective decision support in the operation is provided for an operator, intervention opportunities can be accurately mastered, and the operation safety and curative effect are improved.

The invention discloses a PCI (Peripheral Component Interconnect) drug balloon postoperative effect prediction method, device and equipment based on a multi-modal image and a storage medium. The method comprises the following steps: firstly, collecting historical preoperative digital subtraction angiography (DSA) images of a plurality of patients, corresponding intracavitary image data and postoperative effect label data; further extracting vascular morphological parameters of a target lesion segment from the DSA image, extracting plaque microstructure features from the intracavity image, combining the vascular morphological parameters, the plaque microstructure features, clinical data of a patient and parameters of a drug balloon instrument into an input feature vector, and taking postoperative effect label data as a regression target; training an ensemble learning regression model; and finally, for a to-be-evaluated patient, acquiring a preoperative DSA image and an intracavity image, extracting features in the same way, inputting the features into the trained model, and outputting an immediate and / or long-term vasodilation gain prediction value of the patient after the PCI drug balloon operation so as to improve objectivity and reliability of a DCB preoperative decision.

The application provides a method for measuring an ultrasound coronary artery flow reserve fraction, and relates to the technical field of ultrasound imaging.The method for measuring the ultrasound coronary artery flow reserve fraction provided by the application estimates the blood pressure distribution of a coronary artery stenosis region through a fluid mechanics model based on ultrasound contrast video, and then obtains a flow reserve fraction FFRUS and a reliability index sigma.Based on the ultrasound contrast video data V0 collected, the coronary artery ultrasound contrast imaging video data V1 is determined by using a sliding window double filtering strategy;based on V1, the stenosis region of the coronary artery is determined as a target region Omega;based on V1, the blood flow velocity field V2 of the target region Omega is determined;based on V2 and the proximal blood pressure value Pa of the target region Omega, the blood pressure distribution V3 of the target region Omega is determined;based on V3, the flow reserve fraction FFRUS and the reliability index sigma are calculated by using the flow reserve fraction definition.

The invention provides an acoustic-magnetic dual-mode diagnosis and treatment agent as well as a preparation method and application thereof, and belongs to the technical field of preparation of tumor diagnosis and treatment agents. The acoustic-magnetic dual-mode diagnosis and treatment agent is surface-modified magnetic nanoparticles which contain nano balloon genes and are subjected to Escherichia coli induced expression; the nucleotide sequence of the nano-balloon gene is a sequence shown as NCBI: KC601845.1, escherichia coli in the acoustic-magnetic dual-mode diagnosis and treatment agent as a diagnosis and treatment agent carrier has an active targeting property on a tumor hypoxic region, and bacteria contain a nano-balloon and have an acoustic response characteristic; the escherichia coli surface modified magnetic nanoparticles have a magnetic response characteristic. In acoustic-magnetic dual-mode imaging, firstly, on a real-time ultrasonic contrast monitoring image, a nano air bag expressed in bacteria can generate an enhanced tumor ultrasonic echo signal; secondly, under the action of an external changing magnetic field, the magnetic nanoparticles on the surfaces of the bacteria can generate an enhanced tumor magnetic vibration imaging effect, so that more efficient tumor diagnosis and / or treatment can be realized.

The application discloses a multi-modal imaging system and method based on an optical low-coherence interference field. The application can realize efficient interference signal collection and imaging under various OCT imaging modes in one set of system and imaging mechanism, and can realize mapping of imaging coordinate systems of various modes through linear transformation by combining the OCT axial imaging characteristics and the scanning setting under the same galvanometer mirror, so that the fusion display of multi-dimensional information in tissues can be completed without complex offline registration. The application can provide wide-area positioning imaging in a large depth range, structure imaging with high resolution and high signal-to-noise ratio, blood flow velocity detection and angiography with a large dynamic range, fast elastic imaging, and can also provide a real-time structure imaging mode with a large lateral field of view, so that a user can observe and operate according to the above information in a dynamic scene. The application has great significance for biomedical application scenes with multi-tissue information requirements.

The utility model discloses a kind of cerebral angiography and treatment of radial artery approach combined catheter, belong to medical instrument technical field, the catheter includes outer sleeve and inner core pipe;The outer sleeve includes outer tube body, the inner core pipe is movably threaded in the lumen of outer sleeve, the inner core pipe includes connected proximal end tube body and distal end tube body, the distal end tube body is pre-shaped structure, the pre-shaped structure of the distal end tube body is formed by multiple arc transition sections connected head to tail, the multiple arc transition sections constitute hook shape and the head end of distal end tube body extends to the outside of hook, the length of the pre-shaped structure of the distal end tube body is 12.5-18.5cm.The utility model sets outer sleeve and inner core pipe as independent catheter, without nesting and unscrewing when operating, reduce blood vessel injury risk;Inner core pipe has stronger superselective ability, can be directly used for the superselective angiography of target blood vessel.

The invention relates to hydrophilic coating equipment for an angiographic catheter and a coating method, and belongs to the technical field of interventional medical instruments. The equipment comprises a cabinet body, two solution tanks, a guide pipe dip-coating curing mechanism and a first moving module, the guide pipe dip-coating curing mechanism comprises a guide pipe dip-coating assembly, a second moving module and a curing assembly. The catheter dip-coating assembly comprises a supporting thin tube capable of extending into an inner cavity of the angiographic catheter and a blocking piece at the far end of the supporting thin tube. The curing assembly comprises an air blowing unit arranged around the angiographic catheter and a pre-curing light source. In the process that the angiographic catheter is lifted upwards from the solution tank, the air blowing unit blows air to the outer surface of the catheter, and meanwhile the pre-curing light source conducts irradiation curing. According to the method, blowing and pre-curing are combined, the sagging phenomenon of the hydrophilic solution caused by gravity is effectively restrained, and therefore the problems that the thickness of a coating is not uniform and the end of the catheter is accumulated are solved, and the uniformity and quality stability of the coating are improved.

The utility model discloses a urinary dual-purpose radiography catheter which comprises a catheterization opening, an air bag, a catheter body, a water injection pipe, a first sealing cover, a connecting end, an auxiliary side pipe, a top end opening and a second sealing cover, the connecting end is fixedly connected to the tail end of the catheter body, the water injection pipe is fixedly connected to the side end of the bottom of the catheter body, and the auxiliary side pipe is fixedly connected to the top end opening. The auxiliary side pipe is fixedly connected to the other side end of the bottom end of the pipe body, the first sealing cover is fixedly arranged on the water injection pipe in a clamped mode, the second sealing cover is fixedly arranged on the auxiliary side pipe in a clamped mode, the air bag is arranged in the end, away from the connecting end, of the pipe body, and the urinary catheterization opening is formed in the front end of the pipe body. The top end opening is formed in the end of the pipe body. The urethral catheter device has dual purposes in a urinary system, namely functions of a ureteral catheter and a urethral catheter, and can also be used for radiography examination.

The invention belongs to an abdominal drainage ultrasound contrast small sample segmentation method and system based on meta-learning. The method comprises the steps of collecting multi-source data and images, analyzing target patient data to obtain patient state difference data, and preprocessing an ultrasound contrast image to obtain a standard contrast image. Performing feature extraction on the historical clinical data to obtain clinical operation difference data, and obtaining physiological influence drainage data according to the influence of the physiological state change of the target patient on the drainage area. The patient state difference data, the clinical operation difference data and the physiological influence drainage data are analyzed to obtain general segmentation features, and a meta-learning feature set is formulated in combination with a standard angiography image; constructing a meta-learning feature segmentation model, inputting a to-be-segmented ultrasound contrast image, and outputting a drainage region segmentation result; the method can adapt to physiological and pathological states and scenes of different patients, significantly reduces the segmentation boundary deviation, the false drop rate and the omission rate, and improves the accuracy of drainage region segmentation.

The present disclosure relates to iodinated polysaccharide compounds comprising a polysaccharide backbone comprising a plurality of carboxyl groups and a plurality of iodinated side groups. The present disclosure also relates to iodinated polysaccharide compounds wherein at least a portion of the carboxyl groups present on the carboxyl-containing polysaccharide chains are functionalized with a plurality of iodinated side groups. Other aspects of the present disclosure relate to methods of forming iodinated polysaccharide compounds, medical compositions comprising iodinated polysaccharide compounds, medical procedures comprising introducing such medical compositions into or between the tissues of a patient, and medical kits comprising such medical compositions.

The application discloses a kind of micro-motion time learning parameter acquisition method, device and medium, belong to medical video understanding and identification field.Therein method includes: obtaining swallowing radiography video data;Video features are extracted according to swallowing radiography video data;The video features include RGB feature and optical flow feature;The video features extracted are input into attention mechanism of variable window size, and feature enhancement processing is carried out, and visual enhancement feature is output;Visual enhancement feature is input into two-stage micro-motion positioning network from coarse to fine, and the result of swallowing radiography micro-motion positioning and identification is output.The application realizes the automatic positioning on time sequence to swallowing radiography video by using the time sequence action positioning technology in video understanding, obtains the time sequence information of each micro-motion in swallowing process, to realize swallowing radiography intelligent quantitative analysis, provides reliable basis.

The embodiment of the invention discloses a method, device and equipment for determining the position of an indication balloon and a medium, and belongs to the technical field of indication balloons.The method comprises the steps that a blood pressure sequence collected by the balloon at a blocking position is collected; determining a dicrotic wave peak according to the blood pressure sequence; determining a diastole by using the dicrotic wave peak, and generating a diastole blood pressure sequence; calculating a blood pressure time attenuation parameter according to the diastolic blood pressure sequence; and according to the blood pressure time decay parameter, determining a current plugging area of the balloon. The balloon plugging area can be accurately determined and indicated without participation of imaging equipment such as digital subtraction angiography (DSA) and ultrasonic examination.

The invention discloses a coupling agent heating and smearing device for ultrasound contrast of abdominal injury patients, and relates to the field of medical instruments, the coupling agent heating and smearing device comprises a disposable coupling agent flattening recoverer and a coupling agent pumping heater, and the coupling agent pumping heater can suck out a coupling agent in a coupling agent glue bottle and heat the coupling agent in the pumping process; the coupling agent pumping heater sprays the heated coupling agent on the abdominal skin on the right side of the disposable coupling agent flattening recoverer, the coupling agent is evenly flattened when the disposable coupling agent flattening recoverer slides towards the right side, and the coupling agent is shoveled and recovered when the disposable coupling agent flattening recoverer slides reversely. The disposable coupling agent flattening recoverer can uniformly flatten a coupling agent on the abdomen, ensures the thickness uniformity of the coupling agent, can quickly shovel up and collect the coupling agent, and can be quickly detached, replaced and discarded to prevent cross infection among patients with skin diseases.

1. The name of the design product: uterine cavity imaging tube. 2. The use of the design product: for uterine cavity imaging. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: design 1 perspective view. 5. Design 1 is designated as the basic design.

This utility model discloses an angiography device, comprising: a support arm with a ring structure, wherein a support bearing is fixedly installed in the inner ring region of the support arm, and three sets of X-ray components are installed inside the support bearing. The three sets of X-ray components are evenly arranged in the circumferential direction of the support arm, and each set of X-ray components includes a pair of oppositely arranged X-ray parts and receiving parts; and a first driving unit for driving the inner ring of the support bearing to rotate along its central axis, wherein the rotation angle range of the support arm driven by the first driving unit is not less than 90°. This utility model increases the feasible installation range of the X-ray components by setting the support arm with a ring structure, and the three sets of X-ray components are evenly arranged on the support bearing inside the support arm to achieve three-dimensional imaging of the patient's examination site. At the same time, the setting of the first driving unit can also realize the rotation of the three sets of X-ray components relative to the patient, thereby achieving effective angiography results for patients with different body positions and physical conditions.

The fixing device comprises a base, a headrest groove is formed in the top of the base, a headrest is fixedly installed at the bottom of an inner cavity of the headrest groove, a movable opening is formed in one side of the base, and a sliding rod is connected into the movable opening in a sliding mode. The electric telescopic rod drives the sliding rod to move to the outside of the sleeve, at the moment, the mask can be overturned to the left side of the base, then the head of a patient is made to rest on a headrest in a headrest groove, the mask is overturned and reset, then the electric telescopic rod is controlled to retract, the electric telescopic rod retracts to drive the mask to descend, and the face of the patient can be covered with the mask after the mask descends. And finally, the two air bags are inflated through the air conveying pipe, so that the air bags are swelled, the face of the patient can be supported after the air bags are swelled, then the effect of rapidly fixing the head of the patient is achieved, and the examination efficiency is effectively improved.

This invention discloses an AI model-based system for predicting microvascular invasion in liver cancer. In this invention, the focus on key information in multimodal data is enhanced through attention weight calculation within the model construction submodule, strengthening the capture of subtle features related to microvascular invasion in liver cancer. By focusing attention on key time frames of abnormal blood flow in ultrasound contrast-enhanced videos and lesion areas closely associated with microvascular invasion in CT images, the system avoids being distracted by a large amount of irrelevant normal tissue data. This reduces ineffective learning of non-critical information, improving the specificity of predictions. Through loss calculation and optimization updates, the efficiency and stability of model training are improved, enhancing its adaptability to real-world clinical data. The optimized update formula can quickly adjust the model's internal parameters, allowing the model to converge stably to a reliable predictive state without spending excessive time on trial and error, reducing prediction fluctuations caused by data differences.

The invention discloses an IVUS-based guide wire-free blood vessel center line identification and navigation method, and relates to the technical field of blood vessel intervention and image navigation. The method comprises the following steps: arranging an IVUS transducer at the front end of an instrument, and synchronously obtaining an IVUS frame sequence and a probe pose; through cavity wall segmentation, center point extraction and time sequence-space fusion processing, a three-dimensional center line of the main blood vessel is constructed, and a safety envelope is generated; for a branch artery, branch super-selection navigation is realized through candidate sector detection, direction estimation and center line generation and splicing; meanwhile, a mismatch rollback and failure protection mechanism is set, so that navigation safety is ensured; the virtual center line is used for replacing a solid guide wire, the risk that blood vessels are punctured and mistakenly enter a false cavity is reduced, the radiography frequency and radiation exposure are reduced, the operation time is shortened, and the method is suitable for complex intracavity treatment scenes of aorta trunks and branches.

The invention discloses a pancreatic cancer CT positioning image adaptive artifact correction and target region sketching system, and relates to the technical field of medical imaging. The system comprises a user multi-dimensional data acquisition module, an artifact risk prediction analysis module, a radiography parameter intelligent optimization module and an image scanning and target area sketching module. A user multi-dimensional association data set is constructed by collecting multi-dimensional individual feature data of a patient, an artifact generation risk coefficient is predicted based on medical big data analysis, key influence factors are screened and contrast agent injection parameters are optimized accordingly, and finally personalized CT scanning and target area sketching are executed. According to the method, limitation of a fixed parameter scanning scheme is broken through, individualized adaptive optimization of contrast agent injection parameters is realized, generation of artifacts is effectively inhibited, pancreatic cancer CT positioning image quality and target region sketching precision are remarkably improved, and reliable technical guarantee is provided for precise radiotherapy.

The utility model discloses a medical radiography auxiliary device, including lead screen assembly, including combined outer frame and inner lead plate, the bottom of inner lead plate is equipped with the symmetric distribution of inserting rod, and the surface on the bottom end of this outer frame is equipped with the positioning hole, limiting component, including with the fixed connection of inner lead plate's top rod, the fixed plate of vertical top rod, install the elastic plate in the inside of outer frame, and this elastic plate includes the steady board and clamping plate and extension plate that integrative cast into shape, all welding has the guide plate on the top end of clamping plate and extension plate, locking assembly, and there is the assembly design of convenient replacement broken lead plate on lead screen, and the outer frame and inner lead plate are combined type, and when installing, the fixed plate is inserted between the corresponding elastic plate, and the bottom end screw insertion of locking rod is inserted into the inside of fixed block, and locking rod limits top rod, makes the outer frame and inner lead plate keep stable, and the outer frame and inner lead plate connection method are simple, and the inner lead plate is convenient to dismount.