65 results about "Puncture Biopsy" patented technology

The invention discloses a tumor needle biopsy robot and an image real-time navigation system thereof, and relates to the technical field of medical instruments, and the method comprises the following steps: extracting historical data, and constructing a segmentation model according to the historical data; acquiring a plurality of medical images of the patient, and constructing a three-dimensional model of the patient according to the plurality of medical images; constructing a visual puncture path according to the three-dimensional model; the method comprises the following steps: acquiring optical tracking data, acquiring a needle point position according to the optical tracking data, correcting a puncture path according to the needle point position, acquiring a path point sequence according to a puncture starting point, a target point, a cost function and a graph structure when an optimal path is planned, and continuously adjusting the path through a path optimization algorithm. The path is far away from key tissues such as important blood vessels and nerves, the path is prevented from excessively approaching or directly penetrating through a dangerous area, so that the rationality of optimal path planning is ensured, the precision controllability of the puncture process is enhanced, the puncture path is corrected in real time through the position of the needle tip, and the possibility of the scheme is further improved.

The invention discloses a multi-modal image fusion assisted precise tumor needle biopsy guide system, and aims to solve the problem that the traditional needle biopsy guide technology is insufficient in precision. The system innovatively adopts a multi-scale feature fusion algorithm and an adaptive weight fusion strategy, deeply fuses ultrasonic, CT, MRI and other multi-modal images, and comprehensively improves the information amount of the images. Through real-time force feedback and path adjustment, in combination with VR / AR guide interaction, intelligent puncture guide is realized, and safe and accurate operation is guaranteed. Tumor features are extracted by using a deep learning algorithm, accurate tumor recognition and dynamic image analysis are realized, and the tumor growth trend is predicted. According to the system, the precision and success rate of needle biopsy are remarkably improved, the pain of a patient and the medical cost are reduced, powerful support is provided for personalized precise treatment of tumors, and the system has extremely high clinical application value.

The utility model relates to the technical field of puncture needles, in particular to a medical electric puncture biopsy needle which comprises a handle and a driving mechanism fixedly connected with the handle, the driving mechanism comprises a shell and a motor located in the shell, the output end of the motor is fixedly connected with a connecting piece, the connecting piece is detachably connected with a puncture needle assembly, and the puncture needle assembly is fixedly connected with the handle. And a battery assembly for supplying power to the motor is arranged in the handle. According to the electric puncture needle, when bone puncture operation is carried out, a puncture doctor needs to hold a handle, the handle is mainly used for controlling the direction and exerting certain pressure, a needle sleeve and a needle core are driven by a motor to rotate left and right rapidly and cut bone tissue continuously, the puncture accuracy can be greatly improved, the time is greatly shortened, and the puncture efficiency is greatly improved. Meanwhile, physical exhaustion of doctors is relieved, operative complications can be greatly reduced, and benefits are brought to the majority of patients.

The invention discloses a tumor risk prediction method and system for assisting prostate needle biopsy decision based on deep learning, and belongs to the technical field of medical artificial intelligence. According to the system, a four-dimensional dynamic fusion and double closed-loop optimization architecture is innovatively constructed, and accurate prediction of prostate cancer risk and intelligent planning of a puncture path are realized through five core modules; a data acquisition module integrates preoperative MRI, intraoperative ultrasound (including SWE and blood flow data), driving gene data and puncture instrument sensing data; the intra-operative real-time multi-modal fusion module adopts a space-time attention Transform network and a CNN-GRU network to realize dynamic feature fusion; the image-genome association modeling module establishes association between a molecular mechanism and an image phenotype through a knowledge graph and a GAT network; the unsupervised field generalization module is combined with a PLDG mechanism and federated learning to improve the cross-center adaptability of the model; and the reinforcement learning real-time navigation module realizes dynamic adjustment of a puncture path based on a PPO algorithm.

The invention belongs to the technical field of lung tissue lesion positioning, and particularly relates to a lung tissue lesion position positioning system and method based on three-dimensional reconstruction. According to the method, overall and local two-stage registration is combined, whole-lung expansion errors are corrected, local deformation is compensated, the lesion position and image alignment is achieved, the three-dimensional lesion position is displayed through the augmented reality technology, doctors are helped to visually master spatial distribution of the focus in the body of a patient, the safety and the success rate of operation or needle biopsy are improved, and the operation efficiency is improved. Based on a breathing model and an elastic registration method, the method can adapt to lung compliance differences and breathing movement conditions of different patients, is particularly suitable for severe or old patients difficult to keep stable breathing, reduces the risk of blind penetration or excessive resection through accurate positioning, and reduces tissue damage and the occurrence rate of postoperative complications.

The invention relates to the technical field of needle biopsy, and discloses a tumor needle biopsy positioning device which comprises a shell, a negative pressure assembly is arranged at the bottom of the shell, a plurality of supporting rods are fixedly connected to the upper surface of the shell, an annular sliding rail is fixedly connected between the top ends of the supporting rods, two sliding blocks are movably connected to the outer side of the annular sliding rail, and the two sliding blocks are fixedly connected to the outer side of the shell. The invention further provides a tumor needle biopsy positioning method which comprises the following steps that a patient lies flat, the whole device is placed on the skin on the outer side of the position needing to be examined, and then the device is placed on the outer side of the position needing to be examined; according to the device, the position of the puncture needle stretching into the skin detection part of a patient with the required depth can be limited, the position of the puncture needle can be more accurately adjusted, and the position of the puncture needle located at the bottom of the positioning cylinder can be subjected to auxiliary positioning through the positioning clamping assembly.

The coaxial puncture needle comprises a needle core, a needle sheath and a limiter, the needle core is arranged in the needle sheath in a penetrating mode, the limiter is arranged on the needle sheath in a sleeved mode, the depth of the needle sheath puncturing into the skin is limited through the limiter, an adhesive tape is attached to the periphery of the limiter, and the adhesive tape is attached to the periphery of the limiter. The limiter is attached to the skin through the adhesive tape to prevent the needle sheath from being taken away from the skin, the head end of the needle core is sharp, the tail end of the needle core is provided with a needle core buckle, the tail end of the needle sheath is provided with a needle sheath buckle, the needle core is buckled on the needle sheath buckle through the needle core buckle and is connected with the needle sheath, the needle sheath buckle is provided with a lever, and the lever is connected with the needle sheath through the lever. The needle core buckle is bounced by pressing the lever, so that the needle core is bounced out of the needle sheath. Compared with the prior art, the efficiency and the safety of ultrasonic real-time guided needle biopsy are improved.

The utility model discloses a centrum puncture biopsy needle which comprises an outer tube structure, the outer tube structure comprises an outer sleeve, the outer sleeve is provided with an outer tube handle, the outer tube handle is provided with a main installation opening communicated with the outer sleeve, and the outer sleeve can be spliced with an inner core structure or an inner tube structure; the inner core structure comprises a puncture cone, a cone handle is arranged at one end of the puncture cone, and the cone handle is connected with the outer tube handle through an assembling assembly; according to the puncture device, tissue sclerotin can be effectively cut off, sclerotin tissue can be cut into the inner sleeve, target sclerotin can be conveniently extracted, the problem that an existing puncture device cannot accurately extract the target sclerotin is solved, positioning and assembling can be conducted, the precision during assembling is improved, and the puncture device is convenient to use. The precision of sampling operation is ensured, and the use is convenient.

The application discloses a kidney fibrosis grading method based on deep learning, an electronic device and a storage medium, and belongs to the field of image processing. The method comprises the following steps: scanning a whole slide digital image of a kidney puncture biopsy specimen to be graded after preparing the specimen, and segmenting the whole slide digital image into a plurality of whole slide local slice digital images; inputting the whole slide local slice digital images into a pre-trained grading model to obtain a kidney fibrosis grading result of the kidney puncture biopsy specimen to be graded, wherein the grading model is a two-stage weak supervision learning framework, which is used for screening a plurality of whole slide local slice digital images strongly related to the whole slide digital image in the first stage, and is used for splicing the plurality of whole slide local slice digital images strongly related to each other into one digital image and inputting the digital image into a deep learning convolution classification network to make a decision aggregation. Thus, the artificial intelligence technology and the image processing technology are applied to clinical medical diagnosis, and the problem of inaccurate artificial grading is solved.

The invention belongs to the technical field of biopsy guns, and provides a semi-automatic biopsy gun with the range capable of being adjusted at will. The invention comprises two parts, the first part is the improvement of the method, and the second part is the application of the main body of the invention patent of the auxiliary device. According to the biopsy gun main body, the coaxial needle main body and the auxiliary device, the coaxial needle main body and the biopsy gun main body are used in a matched mode, the auxiliary device is a set, different types of auxiliary devices are selected for use in the puncture process, and the auxiliary device is the key for completing accurate biopsy sampling. In conclusion, the device is reasonable in design, easy to operate and controllable in range, accurate biopsy sampling can be achieved, and the safety of needle biopsy is effectively improved; therefore, the device is suitable for industrial popularization.

The utility model discloses a bone needle biopsy needle, which relates to the technical field of bone needle biopsy and comprises a handle and a groove arranged at the top of the handle, a sleeve penetrating through the handle is arranged at the bottom of the handle, a needle core and a sampling needle matched with the sleeve are inserted in the sleeve, and an inclined cutting edge is arranged at the bottom of the sleeve. Sampling lines are arranged on the inner wall of the sampling needle, the bottom of the needle core extends to the outer side of the sleeve, a polishing surface is arranged at the tail end of the needle core, the bottom of the needle core is an elliptical sphere, the whole sphere is made of metal with the hardness larger than that of a skeleton, and the polishing surface is arranged on the surface of the sphere. The grinding surface at the bottom of the needle core is ensured to have enough contact area with the bone, the grinding surface at the edge can be ensured to be in contact with the inner wall of a through hole when the needle core extending out of the sleeve is in contact with the through hole in the surface of the bone, and if the needle core cannot penetrate through the through hole, the through hole can be ground through the grinding surface at the tail end by rotating the needle core, so that the shape of the through hole is changed.

The utility model discloses a brain tissue needle biopsy device, which relates to the technical field of medical instruments and comprises an arc-shaped mounting frame, a sliding block is arranged on the arc-shaped mounting frame, a support is arranged on the sliding block, limiting grooves which are symmetrically distributed are arranged on the inner side of the support, a movable block is arranged on the support, and the movable block is arranged on the arc-shaped mounting frame. The two ends of the movable block are in sliding connection with the support through the limiting grooves, a threaded rod is arranged on the movable block, the top end of the threaded rod penetrates through the support and is in threaded connection with the support, and a biopsy needle is arranged on the movable block. And deviation of a puncture position and a puncture angle is easy to occur, and the proficiency and the ability of a surgeon are too relied too much.

The invention provides a magnetic control capsule endoscope robot with a puncture biopsy taking function. Comprising a biopsy puncture needle module located at the front end, a capsule shell module, a fixing leg located at the tail end, a waterproof plug, a cam, a height-variable rotating ring device, an internal magnet, a camera module, a positioning pin, a positioning pin, a spring, a rotating table device and an external magnet. A traditional enteroscopy mode is replaced, and the workload of enteroscopy doctors and the pain degree of patient examination are reduced.

The CT-guided needle biopsy body surface calibrator comprises a calibration ruler and a catheter, the calibration ruler comprises two supporting strips which are arranged in parallel and are made of plastic materials, and a plurality of metal rods which are arranged between the two supporting strips at equal intervals; wherein the middle part of one or more metal rods is movably connected with an angle regulator, and the catheter is arranged on the angle regulator and is used for guiding the puncture needle. According to the puncture calibrator, the smoothness and success rate of puncture operation can be improved, the calibrator can be repeatedly used, the equipment cost is lower, and the puncture calibrator is worthy of being vigorously popularized.

The ultrasonic needle biopsy needle comprises a needle body and a needle head, the needle body is of a hollow cylinder structure, an opening groove is formed in the front end of the needle body, a positioning spine and a main blade are arranged at the end of the needle head, the main blade is provided with a first side blade inclining towards the periphery, and the first side blade is provided with a second side blade inclining towards the periphery. The distance between the positioning spine and the needle body is larger than that between the main blade and the needle body, the two circumferential ends of the main blade are each provided with an open groove, the two circumferential ends of the positioning spine and the two circumferential ends of the main blade are connected with the open grooves through slope blades, and therefore a large opening is formed between the two slope blades connected with the open grooves. According to the ultrasonic needle biopsy needle, the main blade is arranged at the end of the needle head, after the positioning spine is used for positioning tissue, the main blade and the slope blades on the two sides of the main blade can completely cut off the tissue, the cutting area occupies more than half of the area of the needle head, and one-time successful cutting can be achieved; and the cut tissue can enter the opening grooves in the two sides, the fixing effect is better, and the tissue is effectively prevented from falling off.

The application relates to the technical field of medical devices, in particular to a skin ultrasound contrast-based axillary sentinel lymph node puncture guiding method. The core of the method is as follows: after injecting an ultrasound contrast agent with a specific particle size through the skin, a preset low-mechanical-index high-frame-rate double-amplitude contrast imaging mode is adopted to dynamically track lymph drainage and sentinel lymph node development, and the enhancement characteristics are recorded; then, under the guidance of multimodal imaging which is fused with real-time contrast, elastic imaging and color Doppler, the target lymph node is accurately punctured and biopsied, and a tissue sample is obtained for pathological analysis. The application realizes integrated operation from sensitive development of the sentinel lymph node, function evaluation to accurate puncture, and provides a non-radiation high-precision puncture guiding method for accurate evaluation of the axillary lymph node state of breast cancer patients before operation.

This invention discloses a flexible needle lung biopsy path planning method and related apparatus. The method includes: inputting a configuration space, a starting configuration, a target region, an obstacle region, and a preset branch angle, wherein the target region has a target deviation probability and an uncertainty range; generating a random configuration through a target bias sampling strategy, selecting random nodes with a certain probability and uncertainty range as target nodes to adapt to tumor puncture biopsy path planning at different locations; constructing a search tree to find the path from the starting configuration to the target region, wherein the branch angle of the search tree is limited to a preset branch angle range to ensure that there are no sharp corners or abrupt turns in the path. This invention improves the convergence speed of the algorithm by increasing the flexible needle parameters and the target deviation of the random point generation, enabling it to reach the target region faster, thereby better simulating the path of the flexible needle inside the tissue and minimizing tissue damage caused by large turning angles.

The invention discloses a visual tumor needle biopsy anti-deviation device which comprises a supporting main frame (1), a sliding assembly (2) arranged on the side portion of an examination bed is arranged at the bottom of the supporting main frame (1), a lifting assembly (3) is arranged in the supporting main frame (1), and a swing mechanism (4) used for positioning a puncture area is arranged at the lifting end of the lifting assembly (3). A straight plate (5) is arranged at the movable end of the swing mechanism (4), a double-angle adjusting assembly (6) used for puncture angle positioning is arranged on the straight plate (5), a long connecting rod (7) is arranged at the movable end of the double-angle adjusting assembly (6), a ring (8) is arranged at the end of the long connecting rod (7), and a detachable puncture positioning rod (9) is arranged in the ring (8). Through cooperative cooperation of the sliding assembly, the lifting assembly and the swing mechanism, rapid positioning and multi-dimensional adaptive adjustment of a puncture area are achieved, the puncture preparation efficiency is improved, and the puncture precision is effectively improved.

The present application belongs to the technical field of medical equipment, and discloses a breast rotary cutting remote control device, which comprises an ultrasonic probe movement assembly, a breast rotary cutting movement assembly and a remote controller. The ultrasonic probe movement assembly and the breast rotary cutting movement assembly are fixedly connected through elastic members, and are fixed around the breast in a circular shape. The remote controller controls the ultrasonic probe movement assembly to move to a lesion site, and controls the breast rotary cutting movement assembly to move to the lesion site for cutting. The annular horizontal and pitch up and down motor rotation enables the ultrasonic probe to obtain a satisfactory image through the remote controller. The encoder feedback of the motor can automatically remotely control the rotary cutting device to an ideal puncture angle, reduces the difficulty of manual adjustment, saves manpower, improves the puncture biopsy accuracy, and further improves the puncture accuracy through the adhesive material, elastic members and annular bandage.

The invention discloses a melanoma needle biopsy device, belongs to the technical field of biomedicine, and aims to solve the problems that most of acquired samples are epidermis or superficial dermis tissues, the deep infiltration condition of tumors cannot be completely presented and false negative diagnosis is easy to occur because biopsy forceps realize tissue grabbing only by virtue of occlusion pressure of forceps heads. The melanoma needle biopsy device comprises a biopsy forceps body and a puncture needle cylinder installed at one end of the biopsy forceps body, a fixing base is installed at one end of the biopsy forceps body, a connecting base is arranged in one end of the biopsy forceps body and is in sliding connection with the fixing base, and two forceps heads are elastically and rotationally connected into the fixing base; according to the multi-layer infiltrating device, the connecting resistance of the epidermis, the dermis and the subcutaneous layer can be broken through through the upward traction action of the adsorption disc on the focus tissue, a continuous tissue strip containing the multi-layer infiltrating condition is obtained, and the core requirement of pathological diagnosis for infiltrating depth judgment is met.

The utility model provides a pen-holding type electric rotating solid tumor cytology needle biopsy device. A puncture device comprises a shell, a rotating / front-back telescopic module, a negative pressure module and a puncture needle, wherein the rotating / front-back telescopic module and the negative pressure module are installed in the shell, and the puncture needle is installed at the end of the shell. The rotating / front-back telescopic module comprises a first driving motor, a driving gear, a driven gear, a first end cam and a second end cam, the first end cam and the second end cam can relatively rotate and axially reset, the first driving motor drives the driven gear to rotate, the driving gear is in meshing transmission with the driven gear, and the driven gear is coaxially and slidably connected with the first end cam. The tail portion of the first end face cam is detachably connected with the puncture needle. According to the puncture device, the pulling and inserting actions and the puncture distance in the puncture process can be accurately controlled, automatic or controllable negative pressure is achieved, the experience dependence of the puncture technology of an operator is remarkably reduced, the learning curve of the operator is effectively shortened, the effective rate of sample taking is improved, and the probability of complications possibly generated in the puncture process can be remarkably reduced.

The embodiment of the application provides a positioning surgical device and a handle structure, and relates to the positioning surgical instrument field.The application aims to improve the problem that it is difficult to accurately puncture the lesion center position in the operation.The application comprises a handle structure, a needle tube and a needle core;the proximal end of the needle tube is installed on the handle structure, the needle core is movably shuttled in the needle tube, the distal end of the needle core can extend or retract from the distal end of the needle tube, and the distal end of the needle core is curled after extending from the needle tube.The needle tube is punctured to the lesion position, the distal end of the needle core is extended from the needle tube under the action of the handle structure, the needle core is hooked to the lesion by being curled, so that the lesion is locked, the pre-positioning of the lesion is realized, the lesion is prevented from being displaced when puncture biopsy and thermal chemical ablation are performed, the surgical instrument can be accurately punctured to the lesion center in the operation, and the operation efficiency is improved.

This invention discloses an auxiliary device for bone marrow aspiration biopsy in clinical blood testing, relating to the field of medical device technology. It includes a base with sliding grooves on both sides, a support frame slidably connected within the sliding grooves, a limit sensor mounted on the support frame, a drive motor mounted on the support frame via a motor bracket, and a screw connected to the output end of the drive motor via a coupling; and a positioning component. Through its designed positioning component, during bone marrow aspiration biopsy, when the drive motor drives the screw to precisely raise and lower the sliding block to the target height, the positioning component is synergistically adjusted by an angle adjustment rod and a lifting support rod, thereby precisely aligning the puncture target point marked by the laser emitter with the guide hole. This ensures that the infrared rangefinder and PLC controller can monitor and calibrate in real time during the puncture operation, greatly improving the success rate and safety of clinical punctures.

This invention discloses a method and system for perioperative follow-up management of renal biopsy, relating to the fields of medical information processing and health screening technology. It acquires basic patient information, symptom information, and test report images; performs layout parsing and field recognition on the test reports to generate structured indicator data; performs discrete coding, interval mapping, and classification labeling on multi-source data to construct a set of indicator units; identifies major risk sources through type-based grouping and normalization, threshold screening based on contribution values, and sorting; calculates the total risk score and determines the risk level, generating risk labels; dynamically adjusts monitoring items, behavioral constraints, and medication management content based on risk labels to form an individualized postoperative management plan; simultaneously generates follow-up time nodes based on risk levels and executes reminder scheduling; and combines doctor-patient interaction records to achieve follow-up status tracking and data statistical analysis. This invention achieves closed-loop processing of perioperative risk assessment and follow-up management.

This invention provides a guide frame, method of use, and testing method for breast lesion biopsy, belonging to the field of medical auxiliary device technology. It includes a breast positioning support component and a movable guide component. The breast positioning support component is placed on the scanning bed and has a scale plate with grid markings for stable support of the breast and quantification of lesion coordinates and height. The movable guide component is slidably disposed on the side of the scanning bed and includes a lifting adjustment mechanism, an angle adjustment guide frame, and a puncture guide with guide grooves, enabling multi-degree-of-freedom precise adjustment and locking of the puncture path. This invention is made of magnetically compatible materials, eliminating artifact interference; it achieves millimeter-level precise positioning through three-dimensional quantification of coordinates, height, and angle; it can be used in conjunction with a physical breast model for preoperative simulation, significantly improving the success rate and safety of puncture. The structure is simple and the cost is low, making it suitable for large-scale clinical application.

The invention relates to a method and a device for perineal prostate needle biopsy. In one embodiment, the device for perineal prostate needle biopsy comprises: (a) a first parallel mechanism for translating or rotating an ultrasonic probe; (b) a series-parallel hybrid mechanism as an end effector of the first parallel mechanism for accommodating the ultrasonic probe and a puncture needle introducer; (c) a driving module of the series-parallel hybrid mechanism for driving the ultrasonic probe to rotate and translate along the axis of the ultrasonic probe; (d) a second parallel mechanism of the series-parallel hybrid mechanism for controlling the configuration of the puncture needle guider relative to the ultrasonic probe and limiting the motion trail of the puncture needle within the axial imaging plane of the ultrasonic probe; and a controller for executing a kinematic modeling method.

The invention relates to the technical field of needle biopsy, in particular to a needle biopsy device for bone infection, which comprises a puncture cannula, the puncture cannula is provided with a puncture suite, the puncture suite comprises a puncture guide wire, one end of the puncture guide wire is connected with a puncture needle, and the puncture needle sequentially comprises a needle tip section, a needle body middle section and a needle tail section. The needle tip section is provided with a diamond-like film coating, and the surface of the needle body middle section is provided with a spiral groove; the puncture cannula is further provided with a biopsy sampling suite, the biopsy sampling suite comprises biopsy forceps, a sleeve is fixedly connected to the outer side of the biopsy forceps, and a barrel saw assembly used for rotationally cutting and collecting bone tissue samples is connected to the sleeve in a sliding mode. The strength of the needle point of the puncture needle is strengthened through design, gradient rigidity of the needle body is achieved, integrated sampling of bone tissue and soft tissue is integrated, and the problems of traditional fine needle puncture angle deviation, insufficient sampling amount and channel deformation are solved.

The application discloses a puncture biopsy device and belongs to the technical field of medical devices. In the puncture biopsy device, a positioning assembly is arranged, the relative positions of a first component and a second component can be positioned by the positioning assembly, the first component and the second component can move towards a third component together, a sheath tube is connected with the second component, the sheath tube can move together with the second component, and a puncture needle can be connected with the first component, so that the first component can drive the puncture needle to move when the first component moves, the puncture needle can drive the sheath tube to pass through tissues when the puncture needle punctures, the puncture needle can be withdrawn, and the sheath tube can be left in the tissues, so that subsequent surgical treatment can be performed, and damage to the tissues is reduced.

The invention relates to the technical field of medical instruments, in particular to an armpit sentinel node needle biopsy method based on skin ultrasound contrast. The core of the method is that after an ultrasonic contrast agent with a specific particle size is injected percutaneously, lymphatic drainage and sentinel lymph node development are dynamically tracked by adopting a preset low-mechanical-index and high-frame-rate double-amplitude contrast imaging mode, and enhancement characteristics of the lymphatic drainage and sentinel lymph node development are recorded; furthermore, under the guidance of multi-mode imaging fusing real-time radiography, elastography and color Doppler, precise needle biopsy is performed on the target lymph node, and a tissue sample is obtained for pathological analysis, so that integrated operation from sensitive development and function evaluation of the sentinel lymph node to precise puncture is realized; and a non-radiation and high-precision minimally invasive diagnosis means is provided for accurate evaluation of the preoperative axillary lymph node state of a breast cancer patient.

The invention discloses a model for needle biopsy practice under ultrasonic guidance. The model comprises a model body and a plurality of target objects. The model body is made of thermoplastic elastomer materials, and the thermoplastic elastomer materials comprise 95.5%-98.5% of SEBS base materials, 1%-4% of castor oil and 0.05%-0.5% of nano graphite powder. The target object is a silica gel bead or a plastic bead, the diameter of the target object is 3-10mm, and the target object is embedded in the model body and is arranged in multiple layers or randomly. The invention further provides a preparation method. The preparation method comprises the steps of preheating, baking, melting, stirring, pouring, target object mounting, curing forming and the like. The model for practice can simulate the needle sticking feeling of real tissue, can leave lasting traces after puncture, has high sound transmission performance, is clear in boundary of a target object under ultrasound, solves the technical problem that an existing model cannot meet the needle sticking feeling, the sound transmission performance and puncture trace retention at the same time, and is suitable for popularization and application. And an ideal practicing tool is provided for a needle biopsy technology under ultrasonic guidance.