79 results about "Venipuncture" patented technology

The invention relates to the technical field of medical intelligent image recognition data processing, and discloses an image recognition and data analysis fused ultrasonic venipuncture system which comprises a multi-modal image acquisition module, an intelligent analysis processing module, a real-time navigation execution module and a complication early warning module. By arranging a multi-mode fusion sensing end, when vein puncture real-time navigation is carried out, through ultrasonic image, thermodynamic distribution and optical characteristic three-mode data collaborative registration, the consistency of deep blood vessel recognition is guaranteed, meanwhile, a three-dimensional topological model containing blood vessel elastic parameters is dynamically constructed, blood vessel position deviation can be calibrated in real time in the puncture process, and the accuracy of vein puncture is improved. The accuracy of blood vessel positioning is guaranteed, puncture positioning errors of complex cases are further reduced, whether angle or depth deviation occurs in a puncture path or not is judged in real time by arranging a dynamic navigation end, a compensation path can be planned in real time through a blood vessel elastic characteristic matrix, and it is guaranteed that the angle errors are reduced when a needle body enters a blood vessel.

The invention discloses a PICC virtuality and reality combined simulation training system and method, solves the problems that puncture simulation training is not real enough and students cannot perform intensive training aiming at a puncture technology due to the fact that an existing venipuncture simulation platform lacks necessary puncture force feedback, and belongs to the technical field of virtual training. The system is composed of a personal information management module, a simulation training terminal, a virtual model management module and a man-machine interaction module, and student operation information is collected in real time based on a multi-dimensional sensor; the virtual model management module reconstructs real anatomical structures such as blood vessels and skin of a human body through a high-precision 3D modeling technology, a physical engine is matched to provide a vivid puncture hand feeling, students can experience a scene very close to real operation, and the simulation training terminal can simulate the real operation through a force feedback technology in a virtual scene. The trainee can feel the touch similar to that of real puncture, so that the understanding of the trainee on the puncture process and the control of the trainee on the puncture strength and angle are improved.

The invention relates to the technical field of medical assistance, in particular to a venipuncture assisting device based on a visualization technology, which comprises a base, fixing pieces are arranged on both sides of the base, adjusting assemblies are arranged at the joints of the two fixing pieces and the base, a binding assembly is arranged in the middle between the two fixing pieces, and an air bag assembly is arranged on the binding assembly. The fixing piece on one side is fixedly connected with an infrared blood vessel imager, the infrared blood vessel imager is in signal connection with a control system, the fixing piece on the other side is provided with a projector, the air bag assembly comprises symmetrical first air bags, the inner sides of the two fixing pieces are fixedly connected with a plurality of second air bags, and the second air bags on the same side are located at the two ends respectively. By means of the design of the air bag system and the utilization of the characteristic of air flow, the dynamic constraint adjustment in the puncture process is achieved while the puncture constraint comfort of a patient is improved, and the puncture accuracy is improved.

The invention relates to a multi-modal data driven caregiver training method and device, equipment and a medium, and the method comprises the steps: eliminating the clock deviation of multi-source equipment through the synchronous processing of joint movement, a voice instruction and hand pressure data, and generating a time alignment data set; fusing the nursing action dynamic features and the pressure gradient features by using a time sequence neural network, and constructing a space-time fusion sequence; the joint angle change rate and the pressure parameter are decoded based on a probability model, and an operation continuity index is quantified in combination with time window integration; and finally, identifying weak links of skills according to the mechanical parameter sequence, and matching a clinical standard course library to generate a personalized training instruction. According to the method, the problems of action-instruction collaborative distortion, one-sided single-mode evaluation and feedback disjunction caused by multi-source data time delay are solved, real-time accurate evaluation and immersive adaptive training of nursing operation biomechanical parameters are realized, and the venipuncture stability and the pressure sore prevention force control capability are remarkably improved.

The invention provides a kind of gel material, including the following components: agar, carrageenan, konjac gum, additives; The mass ratio of described agar, carrageenan, konjac gum is 18-22:1-5:1-5; The described additives include potassium dihydrogen phosphate, potassium sorbate, food coloring. The venipuncture model of the present invention is a highly simulated human blood vessel model, which can simulate real human blood vessel structure, so that learners can perform practical operation in a simulated environment, improve learning effect, adopt agar as main material, simple to make, with low cost, convenient for large-scale production and promotion, single model single point can actually enter needle puncture and reach more than 70 times, improve mold service life, and reduce cost.

The utility model relates to the technical field of joint fixation, in particular to a venipuncture joint fixator which comprises a first fixing frame and a second fixing frame rotationally installed on one side of the first fixing frame, a support is fixedly installed at the bottom of the first fixing frame, and two sets of supporting rods are rotationally installed at the bottom of the second fixing frame. Driving pieces are arranged at the ends, away from the second fixing frame, of the two supporting rods, the second fixing frame can be driven to rotate through the driving pieces, and the driving pieces are further arranged at the top of the support; the first fixing frame and the second fixing part are arranged on the support, the punctured limb part of a patient can be fixed through the elastic bands and the elastic gaskets, and then the two supporting rods are driven to rotate through the arranged driving part, so that the second fixing frame is driven to rotate, and then the joint part of the patient is driven to bend and rotate; and in the bending process, the bending state can be fixed, operation and use are simpler and more convenient, and the actual treatment effect can be further improved correspondingly.

A handheld imaging device (100) for medical use comprising: a housing (106); and a sensor base (101) connected to the housing (106). The sensor base (101) comprises a first acoustic transducer array for imaging a sub-dermal structure in a first plane and a second transducer array for imaging the sub-dermal structure in a second plane. A processor (205), operable under control of electronic program instructions, activates transducer elements of the first transducer array (102) (e.g. operable in continuous wave Doppler ultrasound mode) and the second acoustic transducer array (103) (e.g. operable in A-mode ultrasound) to transmit signals and process receive signals reflected by the sub-dermal structure (104) to display an image of the sub-dermal structure (104), e.g. a vein. The processor (205) calculates characteristics of the sub-dermal structure (104) from the first and second imaged planes. The device (100) may be used in medical ultrasound to facilitate procedures such as cannulation and venepuncture.

1. The name of the design product: multifunctional child venipuncture operating table. 2. The use of the design product: operating table for venipuncture of children. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view. 5. The bottom surface of the design product is the part that is not easy to see or cannot be seen during use, and the top view is omitted.

The utility model discloses a newborn hand back arteriovenous observation auxiliary device which comprises a palm placing plate and an arm placing plate, an included angle exists between the palm placing plate and the arm placing plate, a lamp ball is arranged on the palm placing plate, the lamp ball is arranged at the position corresponding to the palm center of a sick child, the wrist of the sick child is placed on the arm placing plate, the hand is held on the surface of the lamp ball, and the lamp ball can light up the hand back arteriovenous. The auxiliary device can assist the palm of a child patient in turning downwards to expose arteriovenous on the back of the hand, and light rays penetrate through the back of the hand of the child patient through the lamp ball to illuminate the arteriovenous, so that medical staff can clearly observe the arteriovenous on the back of the hand of the child patient, and the success rate of venipuncture is improved.

The utility model discloses a multi-point wrapping type medical fixing band capable of being opened and closed for children. The multi-point wrapping type medical fixing band comprises a main band body and a plurality of bandage bodies. A window is formed in the middle of the front end of the main belt body. The chest and the knees of a child are wrapped by the main belt body, and the bandage bodies are fixedly connected with the edge of an operating bed in a matched mode, so that the child can be well fixed in the whole process in the operation, adverse events such as falling down and falling off the bed are effectively prevented, the bandage body corresponding to the puncture part can be independently opened during general anesthesia venipuncture of the child, and the operation is convenient. Meanwhile, the window is formed, and a transparent adhesive film capable of opening or closing the window is arranged in a matched mode, so that a doctor can conveniently observe a child in time during an operation, warm keeping of a patient is achieved, and hypothermia of the patient during the operation is prevented; the main band body is composed of the cotton cloth base layer, the first antibacterial non-woven fabric and the second antibacterial non-woven fabric, and a better sterile environment is provided for the operation process.

The application provides a venipuncture execution device, which comprises a first linear driving mechanism, a first rotary driver, a swing arm, a second rotary driver, a second linear driving mechanism and a third rotary driver, the output end of the first linear driving mechanism is connected with the first rotary driver, the output end of the first rotary driver is connected with one end of the swing arm, the other end of the swing arm is fixedly connected with the second rotary driver, the output end of the second rotary driver is connected with the second linear driving mechanism, and the output end of the third rotary driver is connected with the first linear driving mechanism. The device has multiple degrees of freedom, can provide multiple puncture angle, distance and posture selection, is convenient to operate and can adapt to individual needs of different patients. The application also provides a method for adjusting a puncture angle and position, when the puncture posture is adjusted, the position of the needle tip of the puncture needle remains unchanged, the stability and the puncture precision are improved, and the puncture needs of different angles and different directions of special blood vessels are met.

The embodiment of the invention discloses a vein puncture training error correction system and method based on multi-modal perception, and belongs to the technical field of medical teaching systems. The problem that the real-time performance and the accuracy of error correction in venipuncture training are low is solved. The data acquisition unit is used for acquiring corresponding venipuncture training operation data and blood vessel response data of the trainee in the current training mode; the coding unit is used for coding the blood vessel response data in real time and constructing a blood vessel state coding sequence; the association unit is used for associating the venipuncture training operation data with the blood vessel state coding sequence to form a coupled data stream; the prediction unit is used for inputting the coupled data flow into a preset venipuncture deviation prediction model, performing operation deviation prediction and generating compensation parameters based on an operation deviation prediction result; and the error correction unit is used for sending an early warning to the trainee based on the operation deviation prediction result and the compensation parameter, and giving operation guide data to realize vein puncture training error correction.

The utility model relates to the technical field of medical instruments, in particular to a parent-child infusion chair which comprises HDPE blow molding chair plates, second supporting frames are installed on the inner walls of the two sides of each HDPE blow molding chair plate, a supporting rod is installed on the outer wall of one HDPE blow molding chair plate, an empty groove is formed in the side wall of each HDPE blow molding chair plate, a handrail is installed at the upper end of each empty groove, and the second supporting frames are installed on the inner walls of the two sides of each HDPE blow molding chair plate. According to the multifunctional infusion support, attention can be distracted through the flat plate body, the anxiety feeling and the fear feeling of children during infusion can be relieved, the initiative of cooperative treatment and the success rate of venipuncture are improved, and the multifunctional infusion support is convenient to use and high in practicability. The soft package seat cushion made of leather not only provides comfortable sitting feeling, but also effectively reduces fatigue feeling caused by long-time sitting posture, and the anti-skidding armrests can effectively prevent accidental slipping, so that the use safety is improved.

The pain relieving and disinfecting nursing bag comprises a sealed bag, lidocaine cotton swabs and iodophor cotton swabs, storage cavities are formed in the sealed bag, access openings are formed in the outer wall of the sealed bag, the access openings are communicated with the storage cavities, the storage cavities correspond to the lidocaine cotton swabs and the iodophor cotton swabs one to one, and the lidocaine cotton swabs and the iodophor cotton swabs are arranged in the sealed bag. And the lidocaine cotton swab and the iodophor cotton swab are correspondingly placed in the accommodating cavity. According to the technical scheme, in the time interval process of waiting for medicine absorption, a patient can be examined for other items in advance, reasonable utilization of time is ensured, the steps of pasting and removing do not need to be conducted, operation is easy, venipuncture efficiency is not affected, and the method is also suitable for people sensitive to skin and meanwhile can be used for disinfection before venipuncture.

This invention discloses a tactile-visual collaborative realistic simulation method for intravenous puncture in virtual training for intravenous therapy nurses, belonging to the field of medical virtual simulation training technology. Addressing the problems of single tactile feedback and poor coordination between tactile and visual feedback in existing systems, this invention uses layered collision modeling to detect the needle tip's level in real time and trigger events; it generates multi-level tactile and visual blood return feedback signals based on the needle tip level and outputs them synchronously based on the same event. This invention allows trainees to simultaneously experience the dual sensations of "feeling emptiness" and "stable blood return within the needle tube" during puncture, achieving close coordination between tactile and visual feedback and helping trainees establish correct neuromuscular memory. This invention can be widely applied in the field of virtual simulation training for nursing skills, significantly improving the realism of training and operational recognition.

The utility model relates to the technical field of ultrasonic guided puncture, in particular to an ultrasonic guided venipuncture sterile protection device which comprises an ultrasonic probe, a sterile bag is installed on the lower side of the ultrasonic probe, four sets of hanging belts are arranged at the corners of the sterile bag, and a connecting plate is installed on the front side of the ultrasonic probe. Fixing columns are fixedly installed on the left side and the right side of the connecting plate, and the hanging belts are connected to the fixing columns in a sleeving mode. The sterile bag is tightly attached to the ultrasonic probe, so that wrinkles or redundant protrusions cannot be generated in the using process of the sterile bag, the comfort of a patient and the convenience of medical staff in the using process of the device are improved, in addition, the connecting plate arranged on the device can be detached, and the device is convenient to use. Moreover, the ultrasonic probe can be stably loaded on other ultrasonic probes, the adaptability of the ultrasonic probe in use is improved, and the ultrasonic probe is further provided with a cleaning triangular block which can scrape the skin, needing to be subjected to needling, of a patient.

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.

An apparatus includes a catheter, an introducer having a first member and a second member, a locking mechanism coupled to a distal end of the first member and configured to couple the introducer to a peripheral intravenous line, and an actuator coupled to the catheter. The actuator is configured to move from a first configuration, in which the catheter is disposed within the introducer, toward a second configuration to move the second member to a distal position relative to the first member. A portion of a guide of the second member being distal to the first member when the second member is in the distal position. The actuator is configured to move relative to the second member to be placed in the second configuration when the second member is in its distal position such that the catheter is disposed within and extending past an end of the peripheral intravenous line.

The invention discloses an intelligent micro-pressure hemostatic cotton ball patch which comprises a contact layer, a pressure control layer, a fixing layer and an intelligent monitoring system. The contact layer is a drug-loaded hydrogel cotton ball, contains chitosan and vitamin K, and expands by 20% after sucking blood; the pressure control layer is provided with eight groups of springs with the initial pressure of 15mmHg, and is provided with a three-color pressure visual window; the fixing layer is a medical silica gel bionic suction cup, and the stripping force is larger than 3N. The intelligent monitoring system comprises a color-changing timing ring (changing from white to blue within 5 minutes) and an errhysis alarm module (a conductive fiber triggers a vibration motor and an LED lamp). The diameter of the device is 3 cm, the thickness is 1.2 cm, Bluetooth transmission and block chain evidence storage can be integrated, the hemostasis efficiency is improved by 55% or above, the early warning speed is increased by 5-10 times, and the device is suitable for hemostasis after venipuncture.

The invention provides a protective disease source blood sample collection device, and relates to the technical field of blood collection. The device comprises a blood taking needle assembly used for establishing a blood taking channel through venipuncture; the bottom assembly is used for providing an autorotation power source with a precise angle and a control function; the placing assembly is arranged at the upper part of the bottom assembly, is used for placing a vacuum blood collection tube and is driven by an autorotation power source of the bottom assembly to autorotate; the inserting and pulling assembly is arranged in the center of the placing assembly and used for inserting and pulling one end, inserted into the vacuum blood collection tube, of the blood collection needle assembly in a reciprocating mode; and the locking assembly is arranged between the bottom assembly and the placing assembly and used for locking the placing assembly. Through the arrangement of the placing assembly, the bottom assembly, the inserting and pulling assembly, the locking assembly and the blood taking needle assembly, vertical and accurate inserting and pulling of the tail needle are achieved, the safety of sample collection is improved, and good protection performance is achieved.

The invention provides a venipuncture training system and method. The venipuncture training method comprises the following steps: acquiring puncture action data of venipuncture performed by a target user in a virtual simulation environment; determining a joint motion track of each body part of the target user according to the puncture action data, determining a balance feature of the body of the target user based on all the joint motion tracks, and determining the pose stability of the target user in venipuncture according to the balance feature and the gravity center offset of the target user; determining puncture path deviations when the target user performs venipuncture in the virtual simulation environment each time, and determining puncture accuracy of the target user performing venipuncture based on all the puncture path deviations; and based on the puncture accuracy and the pose stability, performing feedback training on the action of the target user during venipuncture. By means of the scheme, the target user can be trained to conduct venipuncture in the virtual dynamic rescue simulation environment.

The utility model provides a fixing device for venipuncture, which relates to the technical field of medical instruments and comprises a U-shaped device plate, a fixing plate mounted on the inner side of the U-shaped device plate, memory foam mounted on the fixing plate, a lower fixing cylinder mounted on the inner side of the U-shaped device plate, and an upper fixing cylinder mounted on the lower surface of the fixing plate. The lower fixing cylinder and the upper fixing cylinder are connected through a spring, plug connectors are installed at the two ends of the inner side of the U-shaped device plate, plug connectors are formed in the plug connectors, and a movable plate is installed on the lower portion of the fixing plate. When the soft memory pillow surface is used by a patient with skin laxity, the skin at the laxity part is tensioned and then fixed on the lower side of an arm, the skin at the puncture part is relatively compact, and blood vessels are not easy to slide and are convenient to puncture. The memory pillow is made of soft and comfortable materials, a patient does not feel uncomfortable when making contact with the skin, and especially for a patient with peripheral nerve injury caused by chemotherapy, due to the fact that the patient cannot make contact with a cold object, the soft surface well solves the problem.

The invention discloses a multifunctional adjustable venipuncture simulation training model for elderly patients. The device comprises a simulation arm, and the simulation arm comprises a simulation skeleton area, a subcutaneous fat area and a skin simulation area which are sequentially arranged from inside to outside; a first type of simulation blood vessels for simulating conventional blood vessels and a second type of simulation blood vessels for simulating hardened blood vessels are embedded and fixed in the subcutaneous fat simulation area; the simulation arm is externally connected with an adjustable blood circulation pipeline, a constant blood circulation pipeline and an adjustable fat circulation pipeline; the two ends of the adjustable blood circulation pipeline are connected with the two ends of the first type of simulation blood vessels respectively, and the adjustable blood circulation pipeline comprises a first blood storage tank, a first conveying pump and a first adjusting valve used for adjusting the opening degree of a valve which are sequentially connected in the flow guide direction; the two ends of the constant blood circulation pipeline are connected with the two ends of the second-type simulation blood vessel respectively; the two ends of the adjustable fat circulation pipeline are connected with the subcutaneous fat area. According to the invention, adjustment of different skin touch feelings is realized.

A method (1200) includes instructing an image capture device (150) to move across an anatomy portion of a subject and capture a sequence of ultrasound image frames (154). For each corresponding ultrasound image frame, the method includes processing the corresponding ultrasound image frame to generate a respective vessel mask (312) that identifies one or more vessel portions (314) of the corresponding ultrasound image frame. The method also includes processing the vessel masks generated for the sequence of ultrasound image frames and corresponding three-dimensional position data (153) to generate a three-dimensional vessel structure map (700) representing vessels (156) within the anatomy portion of the subject. The method also includes processing the three-dimensional vessel structure map to select a candidate vessel (156C) to target for venipuncture from the vessels represented in the three-dimensional vessel structure map.

The utility model relates to the technical field of medical instruments, in particular to a special ultrasonic guide indwelling needle puncture auxiliary device for a patient with difficulty in venipuncture, which comprises a base and the like. The base is a bearing carrier of the device, the base can be conveniently mounted or dismounted through bolts, the placement pad is arranged on the top surface of the base and used for supporting the puncture part of a patient, and the limiting pad is arranged at the top of the placement pad and used for limiting the part, placed on the placement pad, of the patient. The placing pad and the limiting pad are made of elastic flexible materials, the contact faces are designed to be in an arc shape, the fixing device can be better attached to the skin of a patient to reduce oppression, the stability of a puncture part is guaranteed through the fixing band, and the risk of puncture failure caused by movement of the patient is reduced.

The utility model relates to a compression hemostasis device for venipuncture, which comprises a fixing component, the fixing component comprises a fixing band and a compression part, and one end of the fixing band is connected to the compression part; the device further comprises an adjusting assembly, the adjusting assembly is matched with the pressing piece, and the adjusting assembly comprises a rotary knob and a pressure regulator. Through the arrangement of the fixing assembly, the angle and the length of the fixing belt can be adjusted relative to the compression piece so as to achieve adaptive fixation, displacement of the compression piece is effectively avoided, and through the connection arrangement of the adjusting assembly and the compression piece, uniform pressure is provided through the compression piece; through the cooperation of the knob and the pressure regulator, the medical staff can quickly and accurately adjust the pressure of the compression main body, and the hemostasis operation is simplified.

The invention belongs to the technical field of medical instruments, and discloses a disposable constant-pressure arteriovenous puncture hemostasis device which comprises an acrylic plate, a bandage wound between the two ends of the acrylic plate and a protrusion formed in the middle of the top end of the acrylic plate. The disposable constant-pressure arteriovenous puncture hemostasis device further comprises a pushing structure and a protective pad. The push structure is arranged in the protrusion, and the protection pad is connected to the push structure, and the magnetic resonance Timm coil rotation adjusting device has the advantages that the push structure is hidden in the protrusion, the longitudinal height and the overall size of the device are greatly reduced, and the problem of space interference between an existing large-size rotation adjusting device and a magnetic resonance Timm coil is thoroughly solved; after being fixed, the device does not interfere with body position placement of a patient, the limb fixing requirement of magnetic resonance examination is met, meanwhile, the risk that the limb of the patient moves due to compression of the device is eliminated, and the acquisition quality of magnetic resonance images is guaranteed.

The utility model provides a vein hemostasis patch with air permeability and a dry cotton ball wrapping function, and particularly relates to the technical field of medical instruments. Aiming at the problems of insufficient air permeability, inconvenience in replacement of a cotton pad, single function, insufficient fixing stability and the like of the existing vein hemostasis patch, the utility model provides the vein hemostasis patch with the air permeability and the dry cotton ball wrapping function, which comprises an adjusting belt and a supporting belt connected to the adjusting belt, a cotton ball bin used for clamping a dry cotton ball is detachably connected to the supporting belt through a hook-and-loop fastener, and the cotton ball bin faces a venipuncture point. According to the device, efficient hemostasis of a puncture point is achieved, the cotton ball is convenient to replace, medicine adjuvant therapy is achieved, and wearing comfort and stability are achieved.

The utility model relates to the technical field of safety seats, and discloses a safety seat suitable for child venipuncture, which comprises a seat body, an asynchronous self-locking stepping motor is fixedly mounted on the outer wall of the seat body, and a seat rod bottom end is fixedly mounted on the outer side of an output shaft of the asynchronous self-locking stepping motor. A chair cushion is fixedly mounted at the top end of the chair rod. According to the safety seat suitable for child venipuncture, in order to improve the applicability and safety of the seat body, the moving assembly is arranged and matched with the base and the controller to start the multi-stage telescopic rod, the ground clearance and the inclination angle of the display equipment are adjusted in cooperation with the mounting frame, and therefore animations are played to transfer attention of children; the child's hip is clamped and fixed in cooperation with an air pump all-in-one machine, a T-shaped pipe, a hose and an expansion air bag, the to-be-punctured arm of the child is fixed in cooperation with a hand support, an arc-shaped cover, a movable hook-and-loop fastener and a fixed hook-and-loop fastener, and a nurse can puncture the vein conveniently in cooperation with an infrared vein scanner.

The invention discloses a flow adjusting device for an indwelling needle, and belongs to the technical field of medical instruments. The device comprises a shell, an elastic pipeline, a rotary driving assembly and a linear motion assembly. The elastic pipeline is arranged in an inner cavity of the shell and is communicated with the joints; the rotary driving assembly comprises a rotary knob and a hollow screw coaxially and fixedly connected with the rotary knob, and the linear motion assembly comprises a sliding block meshed with the hollow screw. One end of the elastic pipeline is fixedly connected with the sliding block, and the other end is fixedly connected with the shell; the rotary knob is rotated to drive the hollow screw rod to rotate and drive the sliding block to move in the axial direction of the screw rod, so that the elastic pipeline is axially stretched or loosened, the inner diameter of the pipeline is continuously changed through radial uniform contraction and recovery of the elastic pipeline, and then stepless adjustment of the infusion flow speed is achieved. The device is simple and compact in structure, accurate and visual in adjustment and capable of being integrated in an indwelling needle channel, and the clinical requirement for infusion of drugs with different flow velocity requirements through single venipuncture is met.