253 results about "Arterial blood" patented technology

The invention discloses an automatic vein and artery puncture control method, which is used for realizing high-precision puncture through precise control, and comprises the following steps of: after determining to start automatic vein and artery puncture control, collecting a blood vessel ultrasonic image; aiming at the target blood vessel ultrasonic image data, establishing a static artery blood vessel detection model based on a lightweight deep network and a target detection algorithm; the blood vessel detection model is used for detecting and positioning blood vessels; collecting a blood vessel image to be detected and positioned in real time, and obtaining the position and category of the blood vessel based on the trained blood vessel detection model; determining a target blood vessel position based on blood vessel positioning and classification, wherein the target blood vessel position is a puncture target position; planning a puncture path based on the target blood vessel position, including vein puncture path planning and artery puncture path planning; and converting the path and the control parameters based on puncture path planning. The invention further discloses a device and a system, which have low requirements on working environment, can adapt to dynamic environment, are convenient to popularize, reduce puncture difficulty and labor intensity and are portable.

The invention discloses an artificial heart valve near-physiological pulsation fluid external evaluation device and method, and relates to the technical field of heart valve testing.The artificial heart valve near-physiological pulsation fluid external evaluation device comprises a supporting frame, a driving unit, a tested valve installation unit and an artery and peripheral loop unit, the driving unit provides power for liquid flowing, and the tested valve installation unit is used for fixing an artificial heart valve; and a liquid volume assembly and a resistance assembly of the artery and peripheral loop unit can simulate the compliance and resistance of aorta blood vessels and peripheral artery blood vessels, so that the pressure waveform simulation of the systemic circulation loop is more accurate. On the basis of the air cavity, the elastic corrugated pipes with different frequency responses are arranged, the compliance and rebound resilience of the aorta are simulated, a device for rapidly replacing the tested valve is designed, and the mechanical property of the simulated human body aorta is adjusted by adjusting the parameters such as the output frequency and the vibration amplitude of the driving unit; real pressure and flow waveforms under different physiological / pathological conditions are simulated, and a more accurate and convenient detection environment is realized.

The invention discloses a method and system for sensing health based on a fingertip wearable spectrum sensor and a computer program product, and the method comprises the steps: controlling a spectrum chip to collect characteristic spectrum data corresponding to an artery blood vessel projection region of a user according to a received index monitoring instruction; the characteristic spectrum data is obtained based on emission and reception of one or more light from ultraviolet light to near-infrared light; receiving the characteristic spectrum data sent by the spectrum chip, and calculating a calibration spectrum value based on the characteristic spectrum data; and the calibration spectrum value is sent to the intelligent terminal, so that the intelligent terminal calculates the physiological health index, analyzes and processes the physiological health index, and pushes a personalized adjustment scheme. The fingertip wearing type spectrum sensing glove is convenient to wear, rich characteristic spectrum data can be collected according to user requirements, the intelligent terminal can quickly and accurately calculate various physiological health indexes, the intelligent terminal is not limited to traditional heart rate and blood oxygen monitoring, and the intelligent terminal can further analyze and process the physiological health indexes.

The invention provides a quantitative risk assessment method and system for head and neck artery stenosis, and the method comprises the steps: collecting the medical image of the head and neck artery of a patient, the blood pressure of the upper arm artery, and the heart rate; a narrow local form, a cerebral artery network anatomical structure / geometric size and a microcirculation blood flow automatic regulation mechanism are comprehensively incorporated into hemodynamic analysis through a geometric multi-scale modeling technology, and information such as an arterial stenosis far-end and near-end pressure ratio, cerebral artery blood flow and hemodynamic parameters of a narrow part is output; quantitative information support is provided for risk assessment of head and neck artery stenosis; the method has the advantages that patient data are obtained only through noninvasive measurement, and the risk that complications are increased due to invasive measurement is avoided; according to the method, a geometric multi-scale modeling method is adopted to achieve integrated analysis of the three-dimensional flow field and the whole-brain circulation hemodynamic parameters of the stenosis part, the blood flow regulation effect of brain microcirculation is considered, and the physiological significance and clinical application value of the evaluation result can be remarkably improved.

The invention discloses application of decitabine in preparation of a medicine for resisting vascular calcification, and belongs to the technical field of medical biology. A CKD mouse vascular calcification model is constructed through combination of 5 / 6 nephrectomy and high phosphorus diet (5 / 6NX), and it is observed that the expression level of DNMT3A in model mouse calcified blood vessels is remarkably increased, and the DNA methylation degree is remarkably increased. Based on this, people try to use decitabine to reduce the expression of DNMT, and discover that intraperitoneal injection of decitabine inhibits the expression of DNMT3A in CKD artery blood vessels and osteogenesis-like transdifferentiation of vascular smooth muscle cells, so that CKD-related vascular calcification is effectively relieved.

A wearable Doppler blood flowmeter can be used with an inflatable cuff to measure blood flow, such as for assessing peripheral artery disease (PAD). The present approach can include techniques such as providing or using a wearable acoustic Doppler blood flowmeter, without requiring the intricate manipulation of a handheld Doppler probe. The system can select a pair of acoustic transmitter and acoustic receiver from a set of more than two transducers, including one or more of different locations, orientations, or spacings, such as to vary a targeted region. The RF echo response signal can be translated to an audio response signal. An audio response signal injection circuit can adaptively inject a noise or other enhancement signal, such as to help improve perceptibility of an audible characteristic of pulsatile arterial blood flow. A trained machine learning model can be employed to select or adjust operating settings, to assess diagnostic information, or both.

The invention discloses a traditional Chinese medicine composition with an effect of improving artery blood vessel plaque and a preparation method and application thereof, and belongs to the technical field of traditional Chinese medicine. The technical problem to be solved is to provide a traditional Chinese medicine composition capable of improving vascular plaques such as carotid artery, aortic arch, brachial trunk, subclavian artery and the like aiming at the current situation that adverse reactions exist when statin lipid-lowering drugs and antiplatelet drugs are taken for a long time to treat artery vascular plaques. According to the technical scheme, the traditional Chinese medicine composition with the effect of improving the artery blood vessel plaque is characterized by comprising radix puerariae, red yeast rice, folium cortex eucommiae, hippophae rhamnoides leaves and natto.

Systems and methods are provided for reducing the reliance on operator skill during vascular ultrasound procedures. The placement of an ultrasound probe to assess perfusion associated with a wound may be facilitated by receiving input suitable for identifying an anatomical region associated with the wound and providing an indication of a suitable initial probe position, and optionally, probe orientation, for acoustically interrogating a target arterial vessel known to provide perfusion to the anatomical region associated with the wound. Regions exhibiting arterial flow may be detected as the probe is moved, enabling arterial vessel detection and localization. A subregion within the detected arterial vessel and a beam steering angle may be autonomously determined for spectral Doppler data collection, enabling the measurement of hemodynamic measures associated with the arterial vessel. Example apparatus for securing the probe to the patient and facilitating probe positioning to search for a target vessel are disclosed.

An example of a digital artery blood pressure monitor may include a tactile sensor array disposed on an inner surface of a cuff, the tactile sensor array including a plurality of capacitive sensors to detect pressure changes within a digital artery of a finger due to blood flow, where the pressure changes cause changes to capacitance values of one or more capacitive sensors of the tactile sensor array, and control circuitry coupled to the tactile sensor array to receive the capacitance values from the tactile sensor array, and determine a blood pressure based on the capacitance values.

The invention discloses a potential stroke risk assessment method and system after coronary artery recanalization, and the method comprises the steps: obtaining the heart and cerebral vessel image data of a patient, and constructing a complete heart and cerebral artery blood vessel geometric model; based on the cardio-cerebral artery blood vessel geometric model, numerical simulation is conducted on the flowing conditions of blood flow in coronary arteries and cerebral vessels by means of a computational fluid mechanics method, and the pressure ratio before and after coronary artery stenosis and the partial pressure ratio of the cerebral vessels are calculated; according to the pressure ratio and the partial pressure ratio, the potential risk of the cerebral arterial thrombosis is quantitatively evaluated, and a cerebral blood flow partial pressure ratio numerical value and a cerebral arterial thrombosis risk evaluation report are generated. According to the cerebral apoplexy risk quantitative evaluation method, by integrating coronary artery CTA and cranial CTA or MRA data, reconstructing a complete heart and cerebral vessel geometric model and simulating heart and cerebral blood flow changes before and after a coronary artery recanalization operation, and particularly by calculating coronary artery FFR and cerebral blood flow partial pressure ratio FPR, an evaluation report is generated, and a basis for quantitative evaluation of the cerebral apoplexy risk in the operation is provided for clinical doctors.

The invention discloses an intracranial artery stenosis functional evaluation method, device and equipment and a storage medium, and the method comprises the steps: processing an obtained intracranial artery angiography image, obtaining a two-dimensional center line and a two-dimensional contour line of a target blood vessel, and determining the three-dimensional diameter of the target blood vessel; determining the three-dimensional length of the target blood vessel according to the gray value distribution on the two-dimensional center line of the target blood vessel; image coordinates of a starting point and an ending point of the target blood vessel are determined according to the two-dimensional center line of the target blood vessel, and finally the average blood flow velocity in the target blood vessel is obtained; and based on the three-dimensional diameter, the three-dimensional length and the average blood flow velocity of the target blood vessel, completing intracranial artery stenosis functional evaluation. According to the method, the three-dimensional length of the target blood vessel is directly calculated from the gray value distribution on the two-dimensional center line in a more concise mode, the complex three-dimensional reconstruction step is avoided, the calculation process is simplified, and meanwhile the evaluation precision and reliability are improved.

The invention discloses a preparation method of vascular tissue-derived extracellular vesicles, and belongs to the field of cytobiology. According to the preparation method of the extracellular vesicles, the artery blood vessel tissue is directly subjected to enzymolysis through collagenase, the extracellular vesicles are obtained by combining low-speed centrifugation and ultra-speed centrifugation methods and utilizing a differential centrifugation mode, and the technical blank of obtaining the extracellular vesicles from the blood vessel tissue is filled. Experimental results show that the extracellular vesicles can be successfully prepared from collagenase I, collagenase II, collagenase IV, collagenase V or collagenase IV combined with elastin, the prepared extracellular vesicles are different in particle size, form, yield, protein quantity, purity and the like, and the quality of the extracellular vesicles obtained by enzymolysis of collagenase IV combined with elastin is optimal. The extracellular vesicles are extracted from vascular tissues with normal physiological characteristics for the first time, a new source is provided for preparation of the extracellular vesicles, and the extracellular vesicles have great significance in expanding application of the extracellular vesicles.

The invention discloses a vein blood oxygen saturation real-time measurement system and method based on an LED light source. The method comprises the steps that 1, a pulse driving circuit outputs pulse voltage to drive LEDs with different wavelengths in a dual-wavelength LED light source to flicker alternately; collecting a photoacoustic signal by an ultrasonic transducer; 2, the ultrasonic signal processing platform receives the collected sound signals and carries out subsequent processing; 3, controlling the ultrasonic transducer to transmit an ultrasonic signal to the same measured part, and receiving an echo signal of the ultrasonic transducer; reconstructing an ultrasonic image of the measured part based on the echo signal; step 4, in the obtained ultrasonic image, positioning a vein to be analyzed and an adjacent artery thereof, and positioning the vein in the ultrasonic image; 5, the arterial oxygen saturation value of the whole body is measured through a finger clamping type pulse oximeter, and quantitative calculation of the venous oxygen saturation is achieved; and step 6, carrying out pixel-level fusion on the oxyhemoglobin saturation information and the ultrasonic image, and realizing visualization on the same frame of ultrasonic image.

The invention provides a traditional Chinese medicine composition for treating acute altitude sickness. The traditional Chinese medicine composition is prepared from ginseng, astragalus membranaceus, acanthopanax, rhodiola rosea, turnip, salvia miltiorrhiza, dogwood, poria cocos, rhizoma cimicifugae, radix bupleuri, platycodon grandiflorum, aster, elecampane, rhizoma anemarrhenae and liquorice. The traditional Chinese medicine composition disclosed by the invention can be used for treating the acute altitude sickness, remarkably prolonging the load-bearing swimming time of rats, remarkably increasing the arterial oxygen partial pressure and the arterial oxygen saturation of acute altitude sickness model rats and relieving physical fatigue, has obvious effects of resisting anoxia, improving acid-base balance and resisting inflammation, and has obvious curative effects on myocardial injury, liver injury, liver injury and the like. And the kidney injury can be protected.

The utility model discloses a splenic artery blood flow limiting support, and particularly relates to the technical field of medical instruments, the splenic artery blood flow limiting support comprises a supporting support and a flow limiting support, the supporting support is sleeved outside the flow limiting support, two ends of the flow limiting support are fixedly connected with the inner side wall of the supporting support, the flow limiting support is a covered stent, and the flow limiting support comprises a contraction section and an expansion section. The contraction section and the expansion section are fixedly connected and communicated, and splenic artery blood flow in the supporting stent flows in from the contraction section and flows out from the expansion section. The splenic artery embolism postoperative spleen blood perfusion can be reduced, and the recurrence of splenic hyperfunction is reduced.

The invention discloses a cerebral artery blood flow velocity prediction method, device and equipment and a medium, and relates to the field of blood flow velocity prediction.The method comprises the steps that cerebral artery nuclear magnetic imaging data are obtained and preprocessed; performing image segmentation to obtain a cerebral artery three-dimensional model; extracting geometric topology information of the cerebral artery; constructing a 0-1-dimensional geometric multi-scale model of the crowd averaged cerebral artery; determining entrance boundary conditions of the 0-1-dimensional model to obtain a 0-1-dimensional patient personalized hemodynamic model; according to a clinical preset contrast agent concentration-time curve and based on the law of conservation of mass, a 0-1-dimensional patient personalized hemodynamic model is used for simulating a contrast agent injection process, and a contrast agent concentration-time curve of each position in the cerebral artery topology network is obtained; based on the concentration data of the contrast agent at the near end and the far end of the target blood vessel, the flow velocity of the contrast agent at different blood vessel segments of the cerebral artery is determined, and the method can be suitable for blood flow velocity estimation of an artery system with a complex topological structure.

The invention provides a cardiac postoperative respiratory function monitoring system and method. The method comprises the steps that photoelectric volume pulse wave signals of a patient during cardiac postoperative breathing are collected through an intelligent optical sensor; extracting a heart rate variability signal of the patient, and determining a quantitative index of respiratory sinus arrhythmia of the patient through the heart rate variability signal; determining the arterial pressure variability of the patient according to the arterial pressure waveform, and fusing the arterial pressure variability and the quantitative index of the respiratory sinus arrhythmia to obtain the cardiopulmonary coupling strength; according to the cardiopulmonary coupling strength and the shallow and fast breathing index of the patient, combining a pre-trained failure prediction model during breathing machine withdrawal, outputting a failure risk value during machine withdrawal of the patient; and outputting a machine withdrawal decision support report of the patient according to the failure risk value and a preset individualized early warning threshold value. According to the scheme, the cardiac postoperative withdrawal risk can be evaluated based on the dynamic cooperation mechanism between the cardiovascular system and the respiratory system.

The embodiments of the present application provide a blood monitoring device and a blood monitoring method for traumatic shock, wherein the device comprises: a first detection module, configured to obtain a common carotid artery velocity time integral and a heart rate by detecting carotid artery blood flow; a second detection module, configured to obtain a blood oxygen saturation by detecting the blood oxygen status of the arterial blood flow; a processing module, configured to determine a carotid artery oxygen delivery reflecting the oxygen supply capacity of the carotid artery to the head according to the common carotid artery velocity time integral, the heart rate, the blood oxygen saturation, the common carotid artery area and the hemoglobin value in the blood; in this way, the detection of multiple parameters is achieved, and it is beneficial to quickly obtain the status and changes of the patient's brain oxygen supply and systemic oxygen supply, comprehensively consider the patient's compensatory capacity, thereby judging the patient's overall risk and reducing the probability of the patient suffering from hemorrhagic shock.

The utility model provides a microsurgery vascular anastomosis training operation table, which is characterized in that a fixing block protruding upwards is fixedly arranged at the left position of the top surface of a base plate, and a left plain end needle head is fixedly inserted into the fixing block from left to right; a sliding block capable of adjusting left-right transverse sliding is arranged at the position, close to the right, of the top face of the base plate, and a right plain end needle is fixedly inserted into the sliding block from right to left. The left plain-end needle and the right plain-end needle are oppositely arranged above the top face of the base plate in a left-right spaced mode, and the two ends of the simulated blood vessel are fixedly connected to needle tubes of the left plain-end needle and the right plain-end needle in a sleeved mode respectively. According to the vascular anastomosis training operation table, the simulated blood vessel can be effectively fixed, pulse water flow or constant water flow is connected to the connecting base of the right plain end needle head, and the simulated blood vessel can be used for simulating an artery blood vessel or a vein blood vessel of a living animal for vascular anastomosis training. When the blood vessel anastomosis training operation table is used for training, blood vessels of living animals do not need to be used, implementation is convenient, and skill training is carried out.

The invention discloses a marker for diagnosing artery blood vessel calcification, a kit and application, and belongs to the technical field of biomedicine. The peripheral blood miR-221-3p disclosed by the invention is a biomarker with a specific screening value for vascular calcification, the peripheral blood miR-221-3p can be used for diagnosing a patient with vascular calcification by detecting the miR-221-3p, the AUC value of the miR-221-3p for diagnosing vascular calcification is 0.742, the sensitivity is 73.3%, and the specificity is 85.0%, so that the miR-221-3p as the biomarker has a relatively high diagnostic value for vascular calcification. Through development and application of the peripheral blood marker miR-221-3p related to vascular calcification and the diagnostic kit, the vascular calcification condition can be rapidly diagnosed and effectively treated in time, and a scientific basis is provided for exploring a novel and effective small molecule drug target.

The utility model relates to an automatic adjustment hepatic duodenal ligament portal vein and hepatic arterial blood flow on-off device which comprises a soft rubber sleeve, a handle, a connecting pipe, a first clamping strip, a second clamping strip, a rotating shaft, a flexible wire and a flexible wire control mechanism. The first clamping strip and the second clamping strip are sleeved with the soft rubber sleeve, one end of the connecting pipe is connected to the soft rubber sleeve, the other end of the connecting pipe is connected to the handle, the flexible wire control mechanism is arranged on the handle, the flexible wire is inserted into the connecting pipe in a penetrating mode, one end of the flexible wire is connected to the first clamping strip, and the other end of the flexible wire is connected to the flexible wire control mechanism. According to the utility model, the defects of the existing porta hepatis occlusion technology can be overcome, more accurate, safer and more convenient blood flow occlusion and conduction control can be realized, and the surgical risk and liver injury can be reduced.

The invention relates to a brain-computer interface system which comprises a flexible electrode array, a receiving device, a flexible connecting wire and external equipment, wherein the flexible electrode array is implanted into a meninx middle artery in a minimally invasive manner through a superficial temporal artery puncture and a vascular intervention procedure; the receiving device is embedded under the skin of a head and is provided with a signal transmitter; the external equipment is provided with a signal receiver. A flexible electrode array is implanted in an anterior branch or posterior branch of a main branch of a middle meninx artery through a superficial temporal artery intravascular minimally invasive technology, the number of electrodes and the array are arranged according to needs, and a receiving device buried in the subcutaneous part of the head is electrically connected with the flexible electrode array implanted in the middle meninx artery. Craniotomy is not needed, operative complications are avoided, minimally invasive implantation reaches the surface of the cerebral cortex, operation of a doctor is easier, the operation time is shortened, and the comfort level of a patient is improved.

The utility model discloses an instrument for negative pressure extraction and filtration of thrombus of an artery. Comprising a sheathing canal, a blocking balloon, a blood collection bag, a pipeline and a negative pressure providing structure, the blocking balloon is arranged on the outer side of the thrombus treatment sheathing canal, then the blood collection bag is connected to the outer side of the sheathing canal through the pipeline, the sheathing canal is connected with the blood collection bag through the pipeline, and a thrombus filter screen is arranged in the pipeline; a negative pressure providing structure is further arranged, the negative pressure providing structure is a structure with a cavity which is arranged on the outer side of the blood collection bag and used for constructing negative pressure by extracting gas in the blood collection bag, power is provided through the negative pressure to lead blood in the arterial blood vessel out into the blood collection bag, and thrombus is blocked at the position of the filter screen after the blood passes through the thrombus filter screen. The filtered safe blood flows into the blood collecting bag, the blood in the blood collecting bag can be transfused back to the patient again in a transfusing mode, and the blood in the blood collecting bag can also provide a blood source for substances for extracting platelet rich plasma (PRP) therapy.

The application relates to the technical field of rehabilitation, in particular to an upper limb rehabilitation training device which comprises a sleeve, an air bag fixedly connected to the inner side of the sleeve, an air pump communicated with the air bag, fixed ends and movable ends respectively at the two ends of the sleeve, a box body fixedly connected to the outer side of the fixed end of the sleeve, a receiving cavity and a control cavity separated by a partition plate in the box body, a receiving opening formed in the side wall of the receiving cavity, a motor fixedly connected to the inner side wall of the receiving cavity, a reel coaxially fixedly connected to the output shaft of the motor, a connecting rod fixedly connected to the side wall of the reel, and the movable end of the sleeve fixedly connected to the side wall of the connecting rod; a controller arranged in the control cavity, and a probe assembly embedded in the inner side of the sleeve. The sleeve is automatically wound and unwound to replace the traditional magic tape fixing, the air bag pressure is automatically adjusted in cooperation with the controller, the probe assembly is integrated to realize real-time monitoring of arterial blood flow, the problems of traditional pressurized sleeves, such as complicated wearing, easy hooking and displacement, and low pressure control precision, are solved, and the single-person convenient wearing, stable and accurate blood flow restriction training is realized.

The application discloses a kind of peripheral blood vessel tension measurement method and device based on ultrasound, it is related to the technical field of hemodynamics monitoring.The application collects the ultrasound image and arterial spectrum data of peripheral artery, obtains the pressure gradient variation characteristic parameter of peripheral artery from the ultrasound image of peripheral artery;According to the arterial spectrum data of continuous multiple heart cycles in the time period set according to peripheral artery, the resistance characteristic parameter of the rise and fall of blood flow velocity and the forward blood flow of peripheral artery are obtained;The pressure gradient variation characteristic parameter, resistance characteristic parameter and forward blood flow are used, which comprehensively reflect the peripheral arterial vessel tension situation.The application can use ultrasound to realize non-invasive, convenient and dynamic real-time reflection of peripheral vessel tension, and the hemodynamic changes can be fed back through the peripheral vessel tension waveform diagram, which is beneficial to early warning and helpful for health management and clinical guidance.

The invention relates to the field of animal models, in particular to a construction method and application of an experimental animal plaque model.The construction method includes the steps that after blood flow is blocked through a balloon method, induction is conducted by directly infiltrating a calcium chloride solution into an endarterium, and finally an artery blood vessel calcified plaque model is formed; therefore, an experimental animal model with high efficiency, repeatability, minimally invasive property and pathological correlation is provided for the research of the artery blood vessel calcified plaque.

The utility model discloses a rapid in-vitro artery blood vessel switching device under field operation conditions, which comprises a switching assembly, a first adapter, a telescopic assembly and a second adapter. The two ends of the first adapter and the two ends of the second adapter are movably connected with the blood vessel opening assemblies on the two sides respectively. The utility model provides an extracorporeal artery blood vessel quick switching device under the field operation condition, the extracorporeal artery blood vessel quick switching device is used in cooperation with a blood vessel distraction assembly, the design of the device aims at achieving quick switching of extracorporeal artery blood vessels, through simple connection of a buckle and a clamping base, switching time is greatly shortened, and precious treatment time is gained for wounded personnel.

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 technical field of arterial blood gas blood taking needles, and particularly discloses a multifunctional arterial blood gas blood taking needle which comprises a syringe, the syringe comprises a syringe needle, a syringe tube and a push rod, one end of the syringe tube is provided with a Luer interface, and the syringe needle is detachably connected with the syringe tube through the Luer interface; the push rod is slidably arranged in the syringe, and one end of the push rod extends out of the syringe; the sealing piece is arranged at one end of the push rod and connected with the push rod; a connecting part is arranged at one end of the protective cap, an abutting part is arranged at the other end of the protective cap, and the protective cap can be detachably connected with the Luer interface in a threaded mode through the connecting part and can also be inserted into the end, away from the syringe, of the push rod through the abutting part. The method has the effects of improving the blood drawing efficiency and ensuring the consistency and accuracy of blood samples.

The application discloses an auxiliary instrument for aortic replacement artificial blood vessel surgery, which comprises a collapsible and inflatable bag body which extends into the aorta of a heart to block blood, wherein the bag body is provided with a bag body channel for blood to pass through, and the upper end of the bag body is connected with a drainage tube; the connection end of the drainage tube with the bag body is provided with a drainage tube cavity; the outer side of the drainage tube is provided with a drainage tube through hole for guiding the seepage blood between the bag body and the aorta of the heart into the drainage tube cavity; the drainage tube is respectively provided with a drainage tube channel which is communicated with the bag body channel and is used for sending the blood in the aorta of the heart into an extracorporeal circulation device, an injection channel which is used for injecting or extracting liquid or gas to the bag body so as to make the bag body inflate or shrink, and a seepage blood extraction channel which is used for extracting the seepage blood in the drainage tube cavity; the seepage blood is guided into the drainage tube cavity through the drainage tube through hole, and the seepage blood is extracted through the seepage blood extraction channel, so that the problem of the seepage blood blocking the suture visual field is solved.