97 results about "Venous vessel" patented technology

An intra-vessel transcatheter filter device (1) designed to capture and remove emboli, thus preventing distal embolization, comprising: • a tubular filter (2) comprising a flexible porous material and defined by a distal element and a proximal element, namely a main body (3) and a funnel (4); i. said main body (3) having a length adapted to extend within a suitable vessel zone; said main body (3) comprising: a) a distal end (5) that is adapted to be radially coupled with said zone and hermetically sealed to it when the device is in an active configuration, said distal end (5) being provided of selectively actionable closure means so that said distal end is designed to be open when the device is in an active configuration and closed before the device retraction, b) a proximal end (6); ii. said funnel (4) forming an extension of said main body (3), with the funnel base located at said proximal end (6). • a support structure assembly (8) comprising: i. a supporting catheter (11) extending within said main body (3), ii. one radially expandable distal structure (9) fixed to said distal end (5), iii. one radially expandable proximal structure (10) positioned in correspondence of said proximal end (6), said distal structure (9) and said proximal structure (10) being fixed at least in an end to said supporting catheter (11).

The invention relates to a computer-implemented method of liver resection surgery planning, comprising the steps of: processing (E2) preoperative computed tomographic images (10) of a patient to generate liver, liver lesion (ss) and venous vessels segmentations; pruning the venous vessels segmentation to retain only major vessels and determining (E3) a primary hepatic zone (PHZ) from the retained major vessels; determining (E4) at least one quantitative feature from the primary hepatic zone, the liver segmentation and the liver lesion(s) segmentation; processing (E5) the determined quantitative features with a classification model to determine a liver resection complexity score for the patient.

The utility model relates to the technical field of medical instruments, in particular to a pacemaker electrode wire, which comprises a wire conduit, the wire conduit comprises a head part and a tail part which are connected with each other, the head part is provided with an electrode assembly, and the electrode assembly comprises a first electrode and a second electrode which are electrically connected with each other. The first electrode and the second electrode are arranged in a spaced mode in the direction from the head to the tail, and a fixing piece located between the first electrode and the second electrode is arranged on the outer side of the wire conduit. The head of the wire conduit can be sent to the right ventricular apex of the heart of a patient through vein puncture, and the fixing piece is in contact with and fixed to the surface of the endocardium, so that the first electrode is firmly fixed to the right ventricular apex, the electrode wire is kept stable in the heart of the patient, and the electrode wire is prevented from shifting or falling off; and the normal cardiac function of the patient is ensured.

The embodiment of the invention provides a fundus artery and vein segmentation method and device, electronic equipment and a storage medium, and belongs to the technical field of image processing. The method comprises the following steps: acquiring a fundus blood vessel topological structure labeling sample set, and acquiring a fundus artery and vein labeling sample set; acquiring an arteriovenous segmentation loss function; based on the fundus blood vessel topological structure labeling sample set, performing model training to obtain a target fundus blood vessel topological structure classification model; based on the target fundus blood vessel topological structure classification model, performing function adjustment on the arteriovenous segmentation loss function to obtain an initial total loss function; based on the fundus artery and vein labeling sample set and the initial total loss function, performing model construction to obtain a target fundus artery and vein blood vessel segmentation model; and based on the target fundus artery and vein segmentation model, performing artery and vein segmentation on preset fundus artery and vein image data to obtain a fundus artery and vein segmentation image. According to the embodiment of the invention, the accuracy of fundus artery and vein segmentation can be improved.

The application discloses an arteriovenous fistula system, and relates to the technical field of medical devices, which comprises a fistula catheter, a handle, a power transmission line and a power output controller. The application makes the operation of the fistula catheter head more convenient, realizes accurate detection of the relative displacement amount of the head electrode, makes the fistula catheter head not loosen even if the external force disappears after being closed, improves the structure of the heating electrode, and makes the size and angle of the fistula not adversely affect the blood flow. The application adds blood flow, blood pressure, temperature and other sensors in the fistula catheter, cooperates with the control function of the power output controller, realizes accurate detection of the opening and closing state of the fistula catheter head, automatic detection of the arteriovenous vessel wall capture, safe output of energy and heating control of the fistula catheter head electrode. The application is more beneficial to the operation of doctors in clinical use and can obtain better fistula effect.

The application discloses an arteriovenous fistula blood vessel lining support and a use method thereof, and the arteriovenous fistula blood vessel lining support has a three-way pipe structure; the axes of two passages in the three-way pipe structure are on a straight line to form a straight pipe, and the axis of the other passage has a variable included angle with the straight line formed by the axes of the first two passages to form a bifurcated pipe; the straight pipe and the bifurcated pipe jointly form a three-way shape of the support with an inner cavity and have optional additional structures near each port; the straight pipe is used for being implanted into an arterial blood vessel; and the bifurcated pipe is used for sleeving a venous blood vessel which needs to be connected. After the arteriovenous fistula blood vessel lining support is embedded, the occurrence of turbulent flow is effectively reduced, blood composition deposition is reduced, the probability of vascular hyperplasia and vascular stenosis is reduced, the arteriovenous fistula maturation time is shortened, and the use time of the fistula is prolonged.

The utility model belongs to the technical field of medical instruments, and particularly relates to a bloodletting device. In the bloodletting device, one end of a drainage tube is connected with a puncture needle through a three-way connector, the other end of the drainage tube is communicated with a drainage bag, and a peristaltic pump is sleeved with the middle of the drainage tube; the puncture needle is punctured into a vein of a patient, the pump head of the peristaltic pump is used for extruding the drainage tube to generate negative pressure in the drainage tube, blood is pumped out of the vein at a constant speed, the stable bloodletting effect is achieved, it is guaranteed that one-time bloodletting amount is sufficient, and the ideal treatment effect is achieved.

The present application belongs to the technical field of medical devices, and discloses a stripper, which comprises a pipe body, a flow channel formed between a first end and a pipe outlet, a plurality of mutually isolated cavities separated by the flow channel, each cavity being provided with a medicine inlet hole and a medicine outlet hole, a plurality of medicine inlet joints arranged in sequence at the first end and connected in one-to-one correspondence with the medicine inlet holes, and a sealing head detachably connected to the second end. The first end of the pipe body is closed, the second end is open, the interior of the pipe body is provided with a plurality of mutually isolated cavities, each cavity is provided with an independent medicine outlet hole, and anesthetic can be input into the interior of the pipe body through the medicine inlet hole connected with the medicine inlet joint. After the anesthetic flows out of the pipe outlet, the pipe outlet is blocked by the sealing head. At this time, when the anesthetic continues to be input into the medicine inlet hole, the anesthetic can only flow out of the medicine outlet hole. During the stripping operation, the anesthetic can perform multi-region anesthesia in the intravenous blood vessels, and the stripping and anesthesia can be performed simultaneously.

This application relates to a method and related apparatus for vascular imaging of an artificial artery and vein arm. The method includes the following steps: acquiring superficial near-infrared images and deep near-infrared images; layering the deep near-infrared images based on the superficial near-infrared images to obtain venous and arterial image information; acquiring pulsed Doppler ultrasound images and obtaining the relative positional relationship between the venous and arterial vessels based on the pulsed Doppler ultrasound images; calculating theoretical arterial image information based on the relative positional relationship from the venous image information; matching the theoretical arterial image and the arterial image, and completing the arterial image based on the matching result. This application has the advantage of improving the imaging effect of vascular imaging instruments.

The utility model relates to the field of medical supplies, and discloses an anti-backflow blood taking needle which comprises a vein blood taking end, a blood taking tube puncture end and a hose for connecting the vein blood taking end and the blood taking tube puncture end, a non-return piece is arranged at the joint of the blood taking tube puncture end and the hose, a silica gel sheet or a silica gel plug is arranged in the non-return piece, and the silica gel sheet or the silica gel plug is connected with the hose. The blood collection tube is used for limiting blood to flow only in the direction from the vein blood collection end to the blood collection tube puncture end. According to the anti-backflow blood taking needle, the non-return piece is arranged between the puncture end of the blood taking tube and the hose to automatically open or close the flow channel, so that blood is effectively prevented from flowing back into the vein of the human body from the blood taking tube in the vein blood taking process, the safety of a person with blood taken is guaranteed, the structure is simple, and the cost is low.

The utility model relates to the technical field of practice teaching molds, and discloses a compression hemostasis teaching aid for adolescent emergency training, which is provided with a liquid bag, a simulated artery blood vessel, a simulated vein blood vessel, a simulated capillary and a micro pump, the liquid bag is used for storing simulated blood; the simulated artery blood vessel, the simulated vein blood vessel and the simulated capillary blood vessel are all of transparent structures and are respectively connected with the liquid bag, and the simulated artery blood vessel, the simulated vein blood vessel and the simulated capillary blood vessel are respectively connected with valves for controlling the on / off state of a pipeline; the micro pump is used for outputting pumping pressure to the liquid bag, and the pumping pressure of the micro pump is adjustable corresponding to the set flow velocity of the simulated artery blood vessel, the simulated vein blood vessel and the simulated capillary blood vessel. The first-aid training device can simulate different blood vessels of a human body and press the corresponding blood vessels to force blood flow in the corresponding blood vessels to be stopped, so that teenagers can practice operation in training, and the teaching effect of first-aid training of the teenagers is effectively improved.

This disclosure provides a measurement system and method for the pathological features of hypertensive retinopathy. The measurement system includes: an acquisition module that acquires fundus images; a partitioning module that receives the fundus images and identifies and partitions the optic disc region; a segmentation module that uses an arteriovenous segmentation model to segment the fundus images into arteries and veins to obtain a three-valued image of the segmentation results. The arteriovenous vessel marking results include arterial and venous marking results formed by marking the boundaries of vessels with diameters larger than a preset vessel diameter in the training fundus images, and small vessel marking results formed by marking the course of vessels with diameters not larger than the preset vessel diameter. The measurement module measures the pathological features of hypertensive retinopathy in the fundus images based on the vessels larger than the preset vessel diameter in the partitioning and segmentation results. This disclosure enables efficient and objective measurement of the characteristics of hypertensive retinopathy.

The utility model discloses a kind of venous hot compress sleeve, including the rectangular block of the sleeve main body made of skin-friendly material, sleeve main body is equipped with heating area, the left side of sleeve main body is equipped with first connecting belt, the right side of sleeve main body is equipped with second connecting belt, corresponding position of first connecting belt and second connecting belt is equipped with detachable connecting piece respectively, the position of first connecting belt close to sleeve main body is equipped with infusion leather strip connecting piece, the position of second connecting belt close to sleeve main body is equipped with elastic tightness area.The utility model can realize temperature controllable and heat preservation to a certain extent, improve hot compress operation convenience and security, not only can help patient expand venous vessel, promote drug absorption, also can relieve pain caused by vasospasm, reduce swelling or induration.

The invention discloses an anastomosis instrument for connecting multiple lymphatic vessels and blood vessels. The anastomosis instrument comprises a blood vessel connecting piece and a plurality of lymphatic connecting tubes. According to the integrated anastomosis instrument, the multiple lymphatic vessels can be connected to the lymphatic connecting tubes respectively through the arrangement of the integrated anastomosis instrument with the multiple lymphatic connecting tubes, and the lymphatic vessels are finally guided into the same vein blood vessel through the through holes; therefore, an efficient connection mode of multiple lymphatic vessels and a single blood vessel is realized, the surgical operation is greatly simplified, the surgical time is shortened, the surgical difficulty is greatly reduced, and the risks of postoperative bleeding, inflammation and vascular stenosis are reduced; in addition, due to the establishment of a plurality of drainage channels, the total drainage efficiency of lymph is effectively improved, and the device is more suitable for clinical conditions with large lymphatic load.

This invention relates to the field of medical device technology, and in particular discloses a medical puncture and catheter placement training manikin, comprising a torso with two arms fixed to both sides. A power supply is fixed inside the torso. Each arm includes a support frame covered with a biomimetic rubber sheath, and at least one fixed vein is fixed to the inner wall of the support frame. The advantages are: multiple combinations can be selected to simulate problems encountered during and after PICC placement; the situation encountered by the operator in each training session can differ from the previous one; and the use of an ultrasound detector and display screen allows instructors to monitor the catheter's position and the operator's specific actions during placement in real time. This facilitates simulated practice and assessment of PICC placement techniques for medical personnel, allowing for evaluation of their mastery of PICC placement techniques and improving their proficiency.

Vascular blood flow modulation is disclosed using metallic compliance-enhancement devices that contain a sealed volume of fluid. The device includes a first elongated inflatable nitinol balloon and a second elongated inflatable nitinol balloon, each having an outer sealed terminus and an inner open fluid port, and a nitinol connector tube that fluidly couples the balloons and has a diameter smaller than the inflated diameters of the balloons. The first balloon is positioned within an arterial vessel and the second balloon is positioned within a venous vessel, with the connector tube spanning between the vessels. During systole, arterial pressure compresses the first balloon to drive fluid through the connector tube into the second balloon, thereby expanding the second balloon and increasing venous blood flow. Cyclic systolic and diastolic pressure variations cause fluid to shuttle between the balloons, producing a compliance-enhancing effect.

The utility model discloses a vein closure radiofrequency ablation component, including handle, catheter and ablation electrode that connect in proper order, the ablation electrode is provided at the front end of catheter, the rear end of catheter extends to handle rear end and is connected with joint, the inside of catheter is hollow structure, joint and the inside of catheter are communicated and are used for the leading wire to pass through before the operation. The ablation electrode is reliable in structure, simple in structure, stable, reliable and convenient to operate, normal saline is instilled to the ablation electrode in an operation to conduct the electrode tip and the outer tube, low-temperature plasma is generated under excitation of radio-frequency current to ablate varicose blood vessels, meanwhile, the high-resistance metal electrode tip is powered on to emit heat, the blood vessels are secondarily heated, and the ablation effect of the high-resistance metal electrode tip is improved. Compared with a coil type catheter, the ablation temperature is not too high, the ablation range is relatively small, tissues are not prone to adhesion, and the vein ablation closing effect is improved.

The application discloses a kind of puncture equipment for assisting venipuncture, including controller, puncture table, appearance mechanism and auxiliary mechanism, one side of puncture table forms puncture area, and puncture area is used to place human hand;Appearance mechanism and auxiliary mechanism are respectively arranged in the side of puncture table forming puncture area, controller is electrically connected with appearance mechanism and auxiliary mechanism respectively, and controller is used to control appearance mechanism, to make the vein blood vessel of human hand in puncture area appear;Auxiliary mechanism is used to obtain the image of hand vein blood vessel appearance and send to controller;Controller is used to mark vein path and puncture point to hand image respectively.The technical scheme in the application proposes that the vein blood vessel of human hand is assisted to appear by appearance mechanism, and the vein path and puncture point after appearance are marked in cooperation with auxiliary mechanism, so that medical staff can be quickly assisted to carry out venipuncture, reduce the dependence of medical staff on personal experience, and improve medical efficiency.

The invention discloses a method for using BFRT equipment for rehabilitation in combination with a visual feedback device, and relates to the field of medicine. Comprising the following steps: screening stroke patients meeting standards; randomly dividing the patients into a combined training group and a single training group; a BFRT pressurization belt is worn at the near end of the thigh on the affected side, an inflation pump is connected to monitor pressure in real time, a visual feedback balance training device is started synchronously, a balance training game is selected, and safety monitoring is conducted in the whole training process; single training group operation: starting a visual feedback balance training device, and selecting a balance training game. Blood flow limitation is combined with visual feedback balance training, and the rehabilitation effect of a patient is observed by comprehensively evaluating the balance function, the lower limb function, the walking ability and the daily life ability of the patient; the thrombosis risk of the patient is observed through blood examination and vein color ultrasound examination, and more basis guidance is provided for rehabilitation training of the stroke patient.

The invention discloses a blood vessel end side anastomat based on an outer lining, which comprises a fixed cylinder, the end part of the fixed cylinder is connected with a nail propping device and a nail pushing device, the nail propping device and the nail pushing device are both of a circular structure, and the nail propping device and the nail pushing device are concentrically arranged. The problem that in the prior art, in the suture process between the end of an artificial blood vessel and the end of a vein, no special medical instrument can meet the use requirement, and the suture can only be conducted in a manual suture mode is solved. According to the blood vessel end side anastomat based on the outer lining, in the suture process of an artificial blood vessel and a vein vessel, the one-time suture effect on the artificial blood vessel and the vein vessel of an annular structure can be guaranteed through the effects of supporting a nail abutting device or a nail pushing device of the anastomat and suturing the other side or abutting nails by means of the eversion structure of the artificial blood vessel. Through the opening and closing structure of the nail abutting device and the nail pushing device, the nail abutting device and the nail pushing device can be conveniently detached from the blood vessel, the operation time is saved, and damage to a patient is reduced.

The invention relates to the technical field of medical instruments, in particular to a blood bypass system. The system comprises an artery sheath assembly, a vein sheath assembly and a bypass pipeline. The arterial sheath assembly comprises an arterial sheath and an arterial sheath dilator, and the arterial sheath is configured to enter the common carotid artery to receive blood flow; the vein sheath assembly comprises a vein sheath and a vein sheath dilator and is configured to enter a vein blood vessel; the bypass pipeline is connected with the vein blood vessel and the vein blood vessel, comprises a filtering unit and is used for filtering embolus particles in the blood flow and releasing the filtered blood flow to the vein blood vessel; the artery sheath comprises a straight branch and a hemostasis valve, and the hemostasis valve is provided with an adjusting mechanism capable of repeatedly adjusting the opening diameter. By establishing an artery-vein shunt channel, blood reflux is guided, and the risk that emboli enter brain blood vessels is reduced; the adjustable hemostasis valve adapts to different instrument diameters, the sealing performance and the passing ability are guaranteed, and the operation convenience and safety are improved.

The vascular clamp for the internal arteriovenous fistula operation comprises an upper fixing frame, a lower fixing frame and a connecting rod, the end, away from the end connected with the lower fixing frame, of the upper fixing frame is fixedly connected with a first clamping arm, and the portion, located at one end of the lower fixing frame, of one side of the first clamping arm is fixedly connected with a second clamping arm; the first clamping arms and the second clamping arms are arranged in a staggered mode, the opposite sides of the ends, away from the upper fixing frame and the lower fixing frame, of the first clamping arms and the second clamping arms are fixedly connected with clamping bases correspondingly, and the interiors of the upper clamping base and the lower clamping base are movably connected with clamping blocks correspondingly. And a connecting ring is fixedly connected between the connected ends of the upper fixing frame and the lower fixing frame. According to the vascular clamp, the upper clamping block and the lower clamping block are attached to each other to clamp a blood vessel, the two clamping blocks rotate in the arc grooves in a sliding mode through the sliding blocks, when arteriovenous blood vessels are clamped, the vascular clamp can be rotated under the condition that the blood vessels are not rotated, and therefore the blood vessels are prevented from being damaged.

The invention relates to a disposable sensitive blood return hose vein needle which comprises a hose vein needle body and a sensitive blood return device, and the hose vein needle body is composed of a vein needle body, a transfusion tee joint, a needle seat, a hose and a liquid penetrating hole. According to the technical scheme, when infusion treatment is carried out on a patient, the metal vein needle for puncturing can be pulled out, the front portion of the hose is reserved in the vein of the patient, the rear portion of the hose is reserved on the arm of the patient, and therefore the situation that the metal vein needle is reserved in the vein of the patient, and the needle point of the vein needle is prone to hurting the blood vessel can be greatly reduced; meanwhile, the flexible pipe intravenous needle can be effectively matched with a sensitive blood return device, blood return information brought by the sensitive blood return device can be clearly and conveniently seen through the liquid penetrating hole in the intravenous needle, and the judgment rate that the flexible pipe intravenous needle correctly penetrates into the blood vessel of the patient is effectively increased.

A garment is provided that is arranged to be worn on a lower limb of a human subject and to cover a knee of the lower limb of the human subject and / or be provided at, above or below the knee of the lower limb of the human subject in use. At least one section of said garment is arranged to provide a compressive force to one or more locations on the lower limb of the human subject when worn in use. The garment is arranged such that the part of said garment that covers said knee and / or is provided at, immediately above or immediately below the knee when the garment is worn in use has at least one region that applies no compressive force to the venous vessels of the knee of the human subject or any compressive force that is applied to the venous vessels of the knee is less than or equal to about 8 mmHg.

The invention discloses a vein real-time tracking method and system based on an ultrasonic image, and the method comprises the steps: S1, obtaining at least two continuous frames of ultrasonic images containing a target blood vessel, and marking a key point corresponding to the target blood vessel in an initial frame; s2, tracking corresponding key points in two continuous frames of ultrasonic images containing the target blood vessel by adopting an optical flow method to obtain an optical flow mask prompt of the current frame of the target blood vessel; and S3, inputting the key point of the target blood vessel in the initial frame obtained in the step S1 and two continuous frames of ultrasonic images containing the target blood vessel into an image large model, and performing target blood vessel segmentation in combination with the optical flow mask prompt of the target blood vessel of the current frame obtained in the step S2. The method can achieve the segmentation and tracking of a target blood vessel in a video, greatly reduces the occupation of a memory or a video memory, improves the calculation real-time performance and calculation speed, and facilitates the prediction of a long-term trajectory.

The present application relates to a radio frequency closing device for vein, belonging to the technical field of medical devices, solves the risk of burning through the vein in the working process of the ablation catheter, solves the problem of the bending part that may pierce the vein blood vessel, causes damage to the health of the patient. The present application comprises a radio frequency tube, a driving unit and a control unit, the radio frequency tube and the control unit are connected with the driving unit, the driving unit is used for controlling the radio frequency tube to be delivered to the target area in the blood vessel, and the radio frequency tube is used for ablation closing varicose vein. The resistance measuring module of the present application measures the resistance value of the head end working area, and sends the resistance value to the control unit in real time, the control unit judges according to the comparison result, if there is a risk of blood vessel piercing or a risk of burning through the vein, the control unit sends an instruction to the driving motor, the driving motor reverses, the radio frequency tube retreats to the driving unit direction, prevents the radio frequency tube from piercing the blood vessel or repeatedly burning through the blood vessel, avoids the damage to the health of the patient.

The utility model provides a whole body vein intervention simulation model, which comprises a trunk base, a support assembly and a blood vessel assembly, and is characterized in that the top of the trunk base is provided with a trunk skeleton; the supporting assemblies are arranged on the two sides of the trunk base. According to the whole-body vein intervention simulation model, the trunk base, the head base, the upper limb base, the lower limb base and the like are combined and supported to simulate various vein blood vessel forms, a circulating pipeline is formed under the cooperation of the connector, the straight-through pipe, the plate-penetrating elbow, the plate-penetrating straight-through pipe and the like, and the whole-body vein blood vessel intervention simulation model is formed under the action of the pulsating pump and the digital display temperature control water tank. Simulated blood flow can be conveniently introduced into a blood vessel pipeline, the blood flow can flow in the model, the requirements of different blood vessel interventional operations can be met, meanwhile, various blood vessel lesion forms can be conveniently arranged at any blood vessel position, the learning and training requirements can be met, and the infection risk possibly caused in actual operation is reduced.

This invention provides a method and system for displaying veins based on image processing, belonging to the field of image processing. The method includes acquiring a near-infrared vein image to be processed, calculating the structure tensor, selecting the minimum eigenvalue map as a guide image, and calculating the pixel value variance. The original image is decomposed into an initial illumination component and an initial reflection component through guided filtering. The order of a two-dimensional least-squares surface fitting is determined based on the pixel value variance, and the initial illumination component is processed using the fitting to generate a background illumination model. A first vessel response map of the initial reflection component is obtained by calculating the Hessian matrix at multiple scales, and a second vessel response map is obtained by calculating local phase consistency. The two are fused to obtain an enhanced reflection component. A correction matrix is ​​generated by combining the background illumination model and gradient magnitude to correct the enhanced reflection component. The corrected reflection component is multiplied by the background illumination model to reconstruct the vein display image. The display image obtained by this invention is more in line with the needs of practical operation.

A pharmaceutical composition comprising azilsartan medoxomil potassium and a calcium channel blocker, a method for preparing same, and use thereof are provided. Azilsartan medoxomil potassium and the calcium channel blocker are formulated into a compound formulation, thus improving the blood pressure lowering efficacy, improving safety and tolerability, and reducing adverse effects. Azilsartan medoxomil potassium can ameliorate peripheral edema caused by amlodipine by means of expanding peripheral venous vessels, while amlodipine can ameliorate adverse effects such as vasogenic edema, dry cough, and the like caused by azilsartan medoxomil potassium.

The utility model discloses a central vein puncture double trocar, which relates to the technical field of medical appliances, and comprises a first needle tube, the end part of the first needle tube is provided with a first needle tube head, and the outer side of the first needle tube head is connected with a first mounting head; according to the central vein puncture double-trocar needle, in the vein puncture process, the skin of a patient is punctured through the first needle head, when venous blood is drawn out, the first needle tube is pushed, the end of the first needle head and the end of the second installation head are driven to be positioned through the positioning ring, the second needle tube is drawn back, and the venous blood is extracted out. The sealing piston ring is driven to pump blood into the first needle tube, whether the pumped blood is venous blood or not is judged, if yes, the first needle tube, the second needle tube, the second mounting head and the piston rod are pulled out together, then the guide wire is inserted into the vein blood vessel from the first mounting head along the first needle head, and in the process, the vein blood vessel can be accurately found, so that the vein blood vessel can be accurately extracted. Practicality is high, and repeated puncture injury of a patient is avoided.