142 results about "Vein puncture" patented technology

A system for the extraction, collection, processing and transplantation of cell subsets, including adult stem cells and platelets, in particular for tissue repair in regenerative medicine, comprises a set of disposable fluid-transport elements that are pre-connected or that include aseptic connectors for making interconnections between them in an aseptic manner or are adapted to be aseptically connected. The set usually includes three kits of disposable sterile elements, a collection kit, a processing kit, and a transplantation kit packaged in a blister pack on a support such as a tray, having one compartment for receiving each inter-connectable kit of the set. The set includes an extracting device, for example including a needle for bone puncture or vein puncture, for extracting bone marrow or other sources of cell subsets from a patient.

A retractable safety needle assembly is provided. The needle assembly includes a tubular outer body, a retraction assembly contained with the outer body and a biasing element for applying a retraction force therebetween. The retraction assembly includes a cannula having an intravenous puncture tip and a non-patient puncture tip at opposing ends. In a first position, the intravenous puncture tip extends from a first end of the tubular outer body. The retraction assembly is adapted for movement within the tubular outer body from the first position to a second position in which the intravenous puncture tip and the non-patient puncture tip are contained entirely within the tubular outer body and are offset from a general axis defining the outer body.

The invention relates to a venipuncture system with infrared guidance and ultrasonic location. The venipuncture system is characterized by comprising an infrared guidance unit and an ultrasonic location unit, wherein the infrared guidance unit comprises an infrared light source, a signal acquisition unit, an infrared image processing unit, an image projection unit and an infrared image display unit; the ultrasonic location unit comprises a high-frequency ultrasonic probe, an ultrasonic image processing unit, an ultrasonic image display unit and a puncture needle connection frame fixed on the ultrasonic probe. According to the system provided by the invention, superficial vein blood vessels can be positioned and displayed through infrared imaging, and the depth of the vein blood vessels also can be identified through the ultrasonic unit under the guidance of an infrared image, so that a needle entering angle and the depth of a puncture needle can be observed in real time, and furthermore, the venipuncture difficulty is reduced and the puncture precision is improved.

The invention discloses a hand back vein injection instrument based on an infrared imaging technology. The injection instrument comprises a control panel, an infrared imaging part, a mechanical injection part, a fixed part and an instrument framework, wherein a horizontal adjusting rod in the mechanical injection part is parallel with two horizontal sliding rods, and is positioned above a center line position of a rectangle formed by four stepping motors; an injection rod is respectively connected with the horizontal adjusting rod and the horizontal sliding rods; 5 stepping motors are respectively connected with a stepping motor driving module; the stepping motor driving module is connected with a single chip microcomputer; the single chip microcomputer is connected with a computer through a digital serial port. The injection instrument is convenient for adjusting of the injection angle, greatly improves the injection stability of the injection rod, can help patients and medical care personnel to remove the interference of human factors, so as to rapidly and accurately accomplish vein injection, and improves the success rate of hand back vein puncture.

The invention relates to a safety vein puncture needle, which consists of a sheath, a needle tube, a needle base, a hose, a spring, a shielding sleeve and a disconnection cut-off clamp, wherein the needle tube is inserted and bonded at the front end of the needle base; the needle base is inserted into a longitudinal groove in an inner cavity of the front section of the shielding sleeve by a side wall ridge and is positioned, so that the direction of a cutting edge of a puncture needle tip is consistent with that of a handle; the shielding sleeve is sleeved outside the needle tube, the needle base and the hose; the spring can be compressed in space of the shielding sleeve and the front end of the needle base; the tail end of the shielding sleeve is bonded with the hose by high-frequency heat seal; the disconnection cut-off clamp is sleeved on the tail section of the shielding sleeve, and is inserted into an opening window of the shielding sleeve; and the wall of the lower section of the shielding sleeve is thickened to form a constricted pipe cavity, so that the side wall ridge at the front end of the needle base can be limited. When the puncture needle is used, a thin bridle of the shielding sleeve can be disconnected only by pinching the disconnection cut-off clamp, so that the shielding sleeve moves forwards under the acting force of the spring to cover the puncture needle completely, and the hose is closed by the cut-off clamp to the risk of needling harm, prevent bloodstain, liquid medicine and body fluid in the hose from overflowing and reduce the propagation of hematogenic diseases.

The invention discloses a human body superficial layer vein three-dimensional reconstruction device and method based on binocular stereoscopic vision. The device comprises two infrared cameras, two filters, near-infrared light sources, USB data lines, a synchronous triggering module and a computer. The two infrared cameras are arranged in parallel and connected with the computer through the USB data lines. The synchronous triggering module is connected with the two infrared cameras and the computer. Lenses of the two infrared cameras are located downwards and located on the same horizontal plane. The two filters are correspondingly arranged on the incident light sides of the two lenses. The brightness of the near-infrared light sources is adjustable, and the near-infrared light sources are arranged below the two infrared cameras. The problem that due to the fact that patient veins are not salient, the failure rate in clinical vein puncture is high is solved.

The invention relates to a method for manufacturing a double-lens multi-spectral imaging lens set and a vein display system thereof. The vein display system comprises the double-lens multi-spectral imaging lens set, and further comprises a light source assembly, an image sensor, an image processing system and a display device. Two lenses in the double-lens multi-spectral imaging lens set respectively have an optical path, each lens can collect different light, one of the lenses is used for filtering near-infrared light and collecting visible light, and the other lens is used for filtering the visible light and collecting the near-infrared light. During one imaging, near-infrared images and visible light images can be obtained at the same time. The two lenses are identical in optical parameter, and the sizes and the positions of the images are basically consistent. Accordingly, the two lenses can be fused through an image processing technology conveniently, enhanced display of local veins of a human body can be achieved, the display effect close to that of human eye observation can be achieved as a whole, and medical staff are assisted in finding corresponding positions during vein puncture.

The invention provides a vein puncture device which comprises a vein displaying device and an adjustable air pressure belt. The vein displaying device and the adjustable air pressure belt are used in cooperation. When the vein puncture device is applied to vein puncture, area of a local tourniquet of an air pressure tourniquet is enlarged and the pressure of the tourniquet can be adjusted, so that the vessel is inflated, pressure after puncturing is gradually reduced and exudation of liquid is relieved. The advantages of the adjustable air pressure tourniquet can be better developed when the adjustable air pressure tourniquet is applied to patients suffering coma, shock, hemorrhage and poor peripheral circulation and the elderly with difficult vein puncture. The piercing of the vessel by a needle point is avoided. As a vein easy-displaying red light illuminating device and an infrared heating device are arranged, the local blood circulation is accelerated, displaying of the vein is enhanced, and therefore the puncture success rate is improved. A disposable bacteria-free isolation cushion is used for preventing cross infection among patients.

The invention relates to automatic puncture equipment. The automatic puncture equipment comprises a machine base, a moving device, a vein puncture device, a detection device, a puncture area positioning platform and an analysis device, wherein the analysis device determines a puncture needle inserting point, a needle inserting parameter and a puncture target point according to a detection image acquired by the detection device, physical sign parameters of a target human body corresponding to a puncture area and pre-stored medical data, and the moving device drives the vein puncture device to move to the puncture target point determined by the analysis device; and a puncture needle is arranged on the vein puncture device, and the vein puncture device punctures the puncture needle into a vein blood vessel according to the needle inserting parameter. According to the technical scheme, the vein blood vessel and the puncture needle inserting point can be automatically recognized, the needleinserting parameter and the puncture target point are automatically calculated, then vein puncture is automatically performed, manual puncture operation errors are avoided, the blood vessel puncturedifficulty is reduced, and remarkable advantages are achieved for some blood vessels which are difficult to recognize.

The invention belongs to the field of medical appliances and particularly relates to a mono-directional inverse-inhibiting safe blood taking needle. The mono-directional inverse-inhibiting safe blood taking needle is characterized by comprising an abutting end needle tubing, a vein puncture end needle tubing and a connection device arranged between the abutting end needle tubing and the vein puncture end needle tubing, wherein the connection device is provided with a mono-directional inverse-flow-inhibiting structure. The blood taking needle has reasonable structure, is capable of avoiding the blood flowing back to human body veins from the blood taking tube by means of the mono-directional inverse-flow-inhibiting structure, so that the safety of the person who is blooded is ensured; the designed needle handle and a vein puncture end needle protection cover are configured into a safe puncture-preventing device, so that the vein puncture end needle tubing is prevented from error puncture, the medical workers are protected, and the safe blood taking function is realized.

The invention discloses a dividing cut-off clip for a safety vein puncture needle. The dividing cut-off clip consists of a button, blades, a barrel and a base. The blades are respectively spliced at both sides of a pressing plate at the lower end of the button, and then, are inserted into the barrel, so that ring teeth and limit teeth of the barrel are interlocked; the base is buckled with a slot at the lower end of the barrel in the direction of the long axis of an arc-shaped groove, and transversal bulges at both sides of a surface bulge of the base are mutually jogged with grooves. The windowing lacings of an infusion hose and a dividing tube are buckled between the slot at the lower end of the barrel and the arc-shaped groove of the base in position. The button is rotated for 90 degrees and is pressed, so that the pressing plate is moved downwards, and the cutting edges of the blades interact with a bulge platform of the base to cut off the dividing tube; the infusion hose is constricted to be closed by the arc-shaped groove on the bottom face of the pressing plate and the arc-shaped groove of the base. Under the action of an external spring force, the vein puncture needle is rapidly separated from a blood vessel and is retracted into a protective casing to be shielded and protected. According to the dividing cut-off clip disclosed by the invention, the vein puncture needle can be protected and the infusion hose can be cut off with single hand by one-time action. The dividing cut-off clip has a safety insurance structure and has the characteristics that simplicity, practicability, safety and reliability are high, the efficiency is improved and ailments are relieved.

The invention provides a vein puncture device and system and a vein puncture control method. The system comprises a control device and a vein puncture device; the vein puncture device and an ultrasonic probe are connected to the control device respectively; the vein puncture device is used for collecting data information of a preselected target vessel through the ultrasonic probe, and sending the data information to the control device; the control device is used for calculating position information of the target vessel according to the data information, and generating a control signal according to the position information; the vein puncture device is further used for controlling a needle body to be punctured and a hosepipe to be embedded which are fixed on the vein puncture device itself to puncture skin according to the control signal. The vein puncture device and system are low in overall manufacturing cost compared with a robot medical system, can automatically control the vein puncture device to conduct motions of needle inserting, hosepipe embedding and needle withdrawing, reduce the labor intensity of an operator, are high in locating precision coordinated with the ultrasonic probe and under the guidance of the ultrasonic probe, can achieve one-hand operation, are low in experience requirement of the operator, and can adapt to the dynamic environment.

The invention provides a puncture guide system for vein and artery recognition based on a neural network. The puncture guide system comprises an ultrasonic image input unit, a neural network model, anultrasonic image generation unit, an ultrasonic image display module and a puncture guide unit, wherein the ultrasonic image input unit is used for inputting an ultrasonic image and inputting a to-be-recognized ultrasonic image into the neural network model for processing; the neutral network model is used for acquiring position information of veins and arteries from the to-be-recognized ultrasonic image through the neutral network model; the ultrasonic image generation unit distinctively marks the veins and the arteries according to the acquired position information, and generates an ultrasonic image containing vein markers and artery markers; the ultrasonic image display module is used for displaying a relative position image of a puncture needle with the vein markers and the artery markers as well as puncture parameters in real time; and the puncture guide unit guides the puncture needle to perform puncture according to the relative position image and the puncture parameters. The puncture guide system can automatically recognize the veins and the arteries in the to-be-recognized ultrasonic image so as to assist a doctor in venipuncture.

The invention discloses a vein vessel recognition system based on a venipuncture robot, which belongs to the technical field of electromechanical integration, and aims at solving the problems that existing venipuncture greatly depends on experience and proficiency of medical staff, and the medical staff is very difficult to accurately conduct venipuncture on special patients. A near-infrared lightsource module is used for providing near-infrared light; wherein the two near-infrared image acquisition modules are used for acquiring near-infrared images of veins respectively and sending the acquired two near-infrared images to the image processing module respectively; and the image processing module is used for performing image processing on the two near-infrared images to obtain a completevein blood vessel upper surface point cloud picture, and displaying the vein blood vessel upper surface point cloud picture in real time. The system has the beneficial effect of improving the venipuncture success rate.

The invention discloses an adjustable arteriovenous puncture needle, and an indwelling cannula and an external protective jacket matched therewith. The adjustable arteriovenous puncture needle comprises a needle body, a needle core and a lead wire, wherein the tail end of the needle core is fixedly arranged on the needle body, at least one rail which is matched with the needle core in length and limits the radial motion and axial rotation of the lead wire is arranged on the needle core along the direction of the needle core, the lead wire is arranged in the rail and made from shape memory alloy, the lead wire does not extend out of the rail at initial state, a handle convenient to drive the lead wire to move and extend out of the rail is fixedly arranged on the lead wire, the lead wire is at natural state after extending out of the rail, an included angle is formed between the lead wire at the natural state and the extension direction of the head end of the needle core, the needle core is inserted into blood vessel by fixed angle through the included angle, and the lead wire is in parallel to the blood vessel at natural state. The adjustable arteriovenous puncture needle is simple in structure, convenient to operate, large in application range, convenient and reliable, easy to popularize and great in practical values.

The invention discloses an arm vein puncture model, which comprises an arm model, a simulated blood vessel, a liquid storage box for storing simulated blood, and a turbine for providing power for circulation flow of the simulated blood. The liquid storage box is connected with the turbine; the turbine is provided with a stepless speed regulation switch; the arm model comprises a simulated skin layer, a simulated subcutaneous tissue layer and a muscle body model, which are sequentially arranged from the outside in, wherein the surface of the muscle body model is provided with a groove for equipping the simulated blood vessel; and the simulated blood vessel is partially arranged in the arm model, and a liquid inlet and a liquid outlet of the simulated blood vessel are connected with the liquid outlet end and the liquid inlet end of the turbine respectively. The arm vein puncture model can provide convenience for medical personnel to carry out puncture exercise, thereby improving the level of puncture technique of the medical personnel.

The invention provides a vein puncture needle which comprises a conduit, a needle probe, a needle holder, a needle handle, and a needle retreating component on the needle handle. The needle retreating component utilizes an operation and control component to control a displacement component to make the needle probe displace in steps and to conveniently allow a second propulsion conduit to enter the proper position of a patient's vein, therefore, raising the success rate of vein puncturing of the puncture needle. The needle retreating component provided by the vein puncture needle has a simple structure and the use of functions is made in a proper order, which not only raises the success rate of vein puncturing of the puncture needle but also effectively protects medical workers from being accidentally injured after the use of the puncture needle.

The present invention provides a disposable safe intravenous puncture needle which is composed of puncture neilsbed, limiting cable, protective spring, protective sleeve and pincture needle. The protective sleeve forms a device with the puncture neilsbed (by lock catch consisted of the protective sleeve heave structure and the puncture neilsbed flute, locating surface consisted of the protective sleeve upper conical surface and the puncture neilsbed down conical surface), but the protective spring and limiting cable are shrinked hidden in the device (the protective spring has same length with the limiting cable, and both ends cement together). The puncture needle inserts into the puncture neilsbed and fixed cements with the puncture neilsbed by the protective sleeve and protective spring, the form is in accord with traditional puncture needle. When transfusion is finished and the puncture needle is pulled out, the protective sleeve can be released by turning the stripe shape heave of the protective sleeve, and the puncture needle is protected in the protective sleeve and can not be pulled out. So the intravenous puncture needle can be reliable protected after clinic using, and can avoid accidentally injery by needle puncturing.

The invention discloses a positioning device for a vein puncture needle position. The positioning device for the vein puncture needle position is characterized in that the positioning device for the vein puncture needle position comprises an infrared source, a main camera, a side camera and an image processing unit; the infrared source is used for irradiating the skin surface and a needle of a puncture area; the main camera is used for taking a picture for the needle above the skin surface of the puncture area from top to bottom; the picture taking direction of the side camera is perpendicular to the picture taking direction of the main camera, and the side camera is used for taking a picture for the needle from the horizontal direction of the skin surface of the puncture area; the image processing unit is connected with the main camera and the side camera, and the image processing unit is used for comparing the pictures taken by the main camera and the side camera to obtain the position of the needle. The positioning device for the vein puncture needle position has the advantages of being simple in structure, accurate in positioning, capable of being reused just through replacing the needle, low in cost and usage cost, high in efficiency, and intuitive and accurate and the like.

The invention discloses a separation cut-off clamp for a safety vein needle. The separation cut-off clamp comprises a key, a barrel body and a base, wherein the key is inserted into the barrel body so as to lock an annular tooth and a barrel body limiting tooth; an arc-shaped concave groove in the base is buckled with an open groove in the lower end of the barrel body in the long axis direction and embedded with a concave groove through horizontal bumps on the side walls of the arc-shaped concave groove and the open groove; the side rope positions of a transfusion hose tube and a separation tube are buckled between the open groove in the lower end of the barrel body and the arc-shaped concave groove in the base; the key is rotated for 90 degrees and pressed down, so that a pressing plate is moved down to be in interact with a recess in the base so as to squeeze and block the separation tube; and meanwhile, the transfusion hose tube is closed by an arc-shaped groove in the bottom surface of the pressing plate and the arc-shaped groove in the base. Under the action of an external spring force, the vein puncture needle quickly departs from a blood vessel and retracts into a protection sleeve tube for shielding protection. According to the separation cut-off clamp, the cut-off effect of the protection of the vein puncture needle on the transfusion hose tube can be finished by one hand under one action; and the separation cut-off clamp has a safety structure and the characteristics of simplicity and practicality, safety and reliability, high efficiency and less pain.

In emergency, the optimal method for building an emergency transfusion channel is intra-bone marrow transfusion which ensures that a medicament and liquid transfused into the marrow cavity can quickly and effectively enter blood circulation. The time for the medicament administrated from intra-bone marrow to enter systemic circulation is basically the same as that for the medicament which is administrated from central veins to enter the systemic circulation, but is quicker than that for the medicament which is administrated from peripheral veins to enter the systemic circulation. For criticalpatients who cannot be treated by regular vein puncture, the intra-bone marrow transfusion may be a first choice instead of the traditional venous transfusion is quick, safe and effective rescue technology and saves precious time for life rescue. In the invention, a medullo-puncture needle is penetrated into the marrow cavity by a mechanical energy releasing device to feed the medicament and the liquid into the veins. The disposable intra-bone marrow injection device drives the medullo-puncture needle into the intra-bone marrow by the mechanical energy released by winded clockwork springs.

The invention relates to a visible blood-back blood taking needle which comprises a vein puncture needle, a cannula needle and a blood taking needle base. A blood stopping sleeve is arranged outside the cannula needle, the blood taking needle base comprises a puncture needle base, a cannula needle fixing base and a cannula needle connecting base, the vein puncture needle is installed and fixed at the front end of the puncture needle base, a hollow blood-back cavity is arranged at the rear end o the puncture needle base, the rear end of the puncture needle base and the rear end of the cannula needle connecting base are butted and sealed, the cannula needle fixing base is inserted in a cylinder at the front end of the cannula needle fixing base and connected with and fixed on the cannula needle connecting base, and a dewatering and air discharge cannula is arranged on the outer side of the cannula needle fixing base and communicated with the blood-back cavity. Since the volume of the visible blood-back cavity is small, the dewatering and air discharging cannula can discharge air out of the blood-back cavity in time to reduce air pressure in the blood-back cavity. The visible blood-back blood taking needle has the advantages of reasonable structure, simple blood taking operation, high efficiency, fast, clear and reliable blood back, convenient observation, and little residual blood in the blood-back cavity which is only 0.03ml.

The invention provides a free skin flap in-vitro distal blood supplying device, and relates to the field of mechanical instruments. The free skin flap in-vitro distal blood supplying device comprises an artery blood supplying unit, a vein blood returning unit, a precise peristaltic pump, a blood anti-freezing device and a temperature control system, wherein the artery blood supplying unit comprises an artery puncture needle, a blood delivery catheter, a flow adjuster, a three-way pipe, a skin flap artery anastomosis needle and an elastic sleeve; the vein blood returning unit comprises a vein puncture needle, a blood delivery catheter, a catheter joint, a three-way pipe, a peristaltic pump pipe, a skin flap vein anastomosis needle and an elastic sleeve; the temperature control system comprises a circulating water pump, a water delivery catheter, a heating catheter and a constant-temperature water tank; the peristaltic pump is precise and is suitable for pumping liquid with medium and small flow; the blood anti-freezing device is a precise injection pump filled with anticoagulant normal saline; and anticoagulant is injected into the artery blood supplying device through a catheter. The free skin flap in-vitro distal blood supplying device is used for distally and continuously supplying blood for free skin flaps circularly in a free skin flap surgery; and the problem that good blood supplying vessels do not exist surrounding a skin flap area is solved.

The invention provides a positioning auxiliary device for a peripheral arteriovenous puncture indwelling catheter. The positioning auxiliary device for the peripheral arteriovenous puncture indwelling catheter comprises a bottom plate, a support and a positioning structure; and the positioning structure is arranged on one side of the support. According to the positioning auxiliary device for the peripheral arteriovenous puncture indwelling catheter provided by the invention, the positioning structure is arranged and can be used in cooperation with the puncture indwelling catheter; the positioning auxiliary device serves as an auxiliary positioning structure of the puncture indwelling catheter; assistance is provided for practice medical staff; the puncture indwelling catheter is effectively positioned when arteries of a patient are punctured; the practice medical personnel only need to push the puncture indwelling catheter to move; the puncture indwelling catheter does not need to be held by hands to move all the time; then, the direct contact area of the hand and the puncture indwelling catheter is greatly reduced; even if the conditions of hand shaking, hand slipping and the like due to tension occur, the influence on the puncture indwelling catheter can be reduced to the minimum; and therefore, the puncture indwelling catheter always moves in a relatively stable state, so that the puncture success rate is greatly improved.

The invention provides a vein puncture system based on infrared thermal imaging technology. The vein puncture system of the invention is based on infrared thermal imaging technology, taking a human body as radiation source, detecting heat radiation emitted by the human body at work, without changing any parameters of the measured object. The system is harmless to human body and environment, and the thermal scanning process is simple, quick and sensitive, and does not require special preparation. After a series of signal processing, the invisible temperature change of body surface is transformed into visible infrared thermogram, and the vein course is calculated and venipuncture is carried out based on the infrared thermogram. The vein puncture system based on the invention can realize veinprecise positioning and puncture automation, and does not need medical personnel to operate, thus saving medical resources.

The invention provides a triad trocar device for deep tissue puncture. The triad trocar device comprises a thick puncture needle, a puncture cannula and a fine puncture needle; in the puncture process, when shallow tissue is punctured, the tips of the thick puncture needle, the puncture cannula and the fine puncture needle are aligned; when deep tissue is punctured, the puncture cannula and the fine puncture needle extend out of the first end of the thick puncture needle and pierce into the deep tissue together, then the fine puncture needle is withdrawn, and a channel is established between the deep tissue and the exterior of the body of a subject through the puncture cannula. By means of the puncturing device and method, important tissue organ damage can be reduced when the deep tissue is punctured, the sensitivity of the deep tissue during puncturing is increased, and the success rate of puncturing is improved, so that clinical prognosis is improved, and the device and method can beapplied to clinical practice such as pericardial effusion puncture drainage and subclavicular vein puncture catheterization, and have high clinical application value.

The invention relates to a control method of a full-automatic vein puncture recognition integrated robot. The control method comprises the steps that a monocular near-infrared camera continuously acquires two-dimensional near-infrared images of a target, blood vessels recognized in the two-dimensional near-infrared images are scored through an image neural network, and the vein with the highest score serves as a target blood vessel; the near-infrared camera acquires the posture of a puncture needle of a puncture mechanism before and after conversion, and the current posture of the puncture needle is refreshed and calibrated; an image movement mechanism moves an ultrasonic probe to the position above the target blood vessel and presses the target blood vessel; the ultrasonic probe collectsa sectional view of the target blood vessel for vein blood vessel three-dimensional reconstruction; and the puncture movement mechanism punctures the target blood vessel, and the near-infrared cameraacquires the current posture of the puncture needle in real time in the puncture process. Compared with the prior art, the recognition precision of the puncture position is higher, the modeling speedis higher, blood vessel detail structure display is more precise and complete, and the puncture safety performance is better.

The invention provides a tourniquet for artery and vein puncture, relating to a body bleeding stopping device. The tourniquet comprises an air sac, adhesive tapes and bonding ensuring skins, wherein the air sac is shaped like a plastic spheroid with a one-piece injection sealing air hole; the adhesive tapes comprise an upper adhesive tape and a lower adhesive tape; the upper adhesive tape is longer than the lower adhesive tape; after the middle parts of the upper and lower adhesive tapes are respectively bonded on the air sac in a semi-circumferentially wrapping manner, the upper and lower adhesive tapes are bonded with each other, so that the upper and lower adhesive tapes and the air sac are fixedly bonded; and the two plastic film bonding ensuring skins as wide as the upper adhesive tape are respectively pasted on the two blank parts, which are not bonded with the lower adhesive tape, of the upper adhesive tape. The tourniquet has the following advantages: the defects that the manually compressed positions are not correct, the compression time is hard to master, the compression forces are inconsistent, the patients need to maintain a certain passive posture during compression and the like are overcome, so that patient limb fatigue and discomfort caused by the situation that the patients need to maintain the stereotypic posture for a longer time can be avoided; and the tourniquet is convenient to use, is safe and greatly reduces the nursing workload.

The invention discloses a vein puncture training tool and relates to the field of medical teaching. The tool includes a hand model and a simulation vein vessel. The hand model is composed of a plurality of cotton clothes which are twined together and are put on a latex glove. The simulation vein vessel is adhered to the back of the hand model at interval by an adhesive. The simulation vein vessel is a natural latex tube. According to the invention, the tool can address the problems of complex structure, high exchanging rate caused by susceptibility to damage in training and failure of wide application in medical schools and all levels of medical agencies due to high prices that are common of current vein puncture training tools.