32 results about "Deep vein" patented technology

The application discloses a kind of prevention instruments for deep vein catheter thrombus, belong to thrombus prevention technical field.It includes bottom plate, one end of bottom plate is equipped with deflection block, the bottom plate is equipped with fixed plate behind deflection block, one end of fixed plate is fixedly connected to bottom plate, the other end of fixed plate is equipped with sliding column, one end of sliding column is surface contact with deflection block, the other end of sliding column is equipped with torque amplification assembly on both sides, torque amplification assembly includes first connecting rod, one end of first connecting rod is rotatably connected to the other end of sliding column, second connecting rod is equipped on the other end of first connecting rod, one end of second connecting rod is rotatably connected to the other end of first connecting rod, traction rope is equipped on the other end of second connecting rod, stand is equipped on second connecting rod, one end of stand is connected to bottom plate, the other end of stand is rotatably connected to second connecting rod.This technical scheme is used to improve the prevention effect of venous thrombosis.

The application discloses a deep vein puncture path generation method and device, the method comprises the following steps: acquiring an ultrasound image of a puncture site; identifying the category of an anatomical target according to the color feature and shape feature of the ultrasound image, and establishing a corresponding feature vector; wherein each feature vector corresponds to an anatomical target; inputting the ultrasound image after the feature vector is established into a preset path model, so that the path model establishes a vein puncture path according to each feature vector, and performs traversal query to output the shortest vein puncture path; wherein the path model establishes a vein puncture path according to each feature vector according to a preset objective function. The technical scheme of the application identifies the anatomical target category in the ultrasound image and outputs the shortest vein puncture path, provides reliable object recognition and path guidance for medical staff, avoids the risk of misjudgment caused by insufficient skills or experience among medical staff, and can improve the accuracy and safety of vein puncture.

The utility model relates to a deep venous catheter connector fixing patch, and relates to the technical field of medical articles. The fixing patch is used for being attached to the skin of a patient, the gauze sleeve is used for being sleeved with a catheter connector, and the gauze sleeve is movably arranged on the fixing patch; a fixing assembly is further arranged on the fixing patch, and the fixing assembly is used for fixing the gauze sleeve and the catheter connector; the catheter connector further comprises a movably-arranged hasp piece, one end of the hasp piece is pasted on the skin of a patient, the other end of the hasp piece is pasted on the gauze sleeve or the fixing assembly, and the hasp piece is used for covering the leakage end opening of the catheter connector. The guide pipe connector has the effect that the guide pipe connector can be conveniently cleaned and replaced.

The invention discloses a deep vein puncture integrated device for monitoring the pH value of blood in a blood vessel and a use method, and belongs to the technical field of medical equipment, the deep vein puncture integrated device comprises a remaining needle catheter, the remaining needle catheter comprises a first pipeline and a second pipeline which are relatively independent, the first pipeline is used for conveying therapeutic liquid, and the second pipeline is used for blood sampling; the three-way valve is arranged on the indwelling needle seat, three ports of the three-way valve are communicated with the second pipeline, the pH value detection unit and the flushing fluid unit respectively, and the three-way valve is provided with a knob used for driving the three-way valve to be switched among different working positions; the control module is in signal connection with the pH value detection unit, the three-way valve driver and external clinical equipment. The whole process of sampling, detecting and flushing can be automatically and intermittently completed according to the preset period, and an almost continuous pH value dynamic change trend curve is provided, so that intervention is performed before clinical symptoms are obviously deteriorated, and the timeliness and accuracy of treatment are remarkably improved.

The invention discloses an ultrasonic blood sampling device and method and application in small animal blood sampling, and relates to the technical field of medical instruments and devices.The ultrasonic blood sampling device comprises an ultrasonic instrument matched with an ultrasonic probe for display, the ultrasonic instrument is arranged on one side of an experiment table, and a blood sampling assembly is fixedly installed on the experiment table and comprises an operation bin, a base and an operation table; the base and the operation table are vertically arranged in the operation bin side by side, a clamping plate is rotationally installed on the operation table through a connecting assembly, a clamping plate is fixedly installed on the clamping plate in a magnetic attraction mode, clamping grooves corresponding to four limbs of a blood sampling animal are formed in the clamping plate, and the connecting assembly is in a W shape. The blood sampling success rate can be increased, the position of the deep vein and the blood flow condition are observed in real time through the ultrasonic imaging technology, the blood sampling needle can be accurately guided to enter the blood vessel, and the blood sampling success rate is remarkably increased.

The present application relates to the technical fields of deep vein catheterization infusion, in particular to a constant temperature control speed device for deep vein catheterization infusion, comprising an infusion catheter head and an infusion tube, one side of the infusion catheter head is fixedly connected with one end of the infusion tube. The present application sets a piston frame structure with spiral flow guide grooves inside the infusion tube, changes the fluid dynamics behavior of traditional plunger type propulsion, when the piston frame reciprocates, the liquid medicine forms spiral jet flow under the guidance of the spiral flow guide grooves, forced fluid generates circumferential rotation, effectively destroys the stationary state of the pipe wall boundary layer, converts the axial thrust into rotational shear force, not only reduces the flow resistance, but also eliminates the stagnant zone at the front end of the piston, realizes uniform delivery of the whole cross section, makes the liquid medicine always maintain a dynamic mixing state during the pushing process, avoids density stratification and sedimentation, especially suitable for the infusion of fat emulsion, amino acid and other easily separated nutrient solutions, greatly improves the stability of the infusion.

The invention relates to a venous valve destruction structure for deep vein transcatheter arterization, and belongs to the technical field of medical devices, the venous valve destruction structure comprises a transcatheter, a venous valve knife and a limiting device, the venous valve knife is inserted in the transcatheter, the venous valve knife is provided with a moving rod, one end of the moving rod is provided with a venous valve blade with an expandable or contractible volume, and the other end of the moving rod is provided with the limiting device. The vein valve blade is retracted into the transcatheter, or the vein valve blade extends out of the transcatheter, and a handle is arranged at the other end of the moving rod; the limiting device is used for limiting the moving position of the venous valve knife and can be rotatably arranged outside the transcatheter, the venous valve knife penetrates through the interior of the limiting device, and the limiting device is connected with the moving rod through threads; the device has the advantages that the limiting device is rotated, the handle is controlled, the vein valve blade moves in one direction, the vein valve blade extends out of the transcatheter, and the vein valve is damaged through linear movement and rotation of the vein valve blade.

The invention discloses a device and method for removing a contrast agent in heart local blood, and relates to the field of medical treatment, the removing device comprises a suction catheter, a power pump, a filter assembly and a backflow catheter which are connected in sequence; the coronary artery of the heart body is communicated with the angiographic catheter, the coronary sinus of the heart body is communicated with the suction catheter, the femoral vein or other deep veins of a human body are communicated with the backflow catheter, and the area between the coronary artery and the coronary sinus is a contrast agent delivery area; wherein the filtering assembly is used for removing a contrast agent in blood. When the contrast agent in the blood is removed, the blood containing the contrast agent is pumped out of the heart body through the suction catheter by the power pump, then the contrast agent contained in the blood is removed through the filtering assembly, and then the blood without the contrast agent is conveyed into the human body again through the femoral vein or other deep veins by the backflow catheter. By means of the circulating conveying mode, on one hand, contrast agents in blood can be removed, and on the other hand, excessive blood loss of a patient can be avoided.

The invention relates to the technical field of medical instruments, and discloses a deep vein pipeline fixing device which comprises an adjustable clamping and fixing mechanism and an adsorption type fixing mechanism. The air suction shell is fixedly installed on the top of the upper clamping ring, and the interior of the air suction shell is of a hollow structure; the second piston plate is placed in the air suction shell and can generate negative pressure suction force; and the second spiral spring can generate elastic pre-tightening force on the second piston plate. According to the deep vein pipeline fixing device, a pipeline can be fixed to the body position of a patient, so that the flexible movement function of the pipeline is guaranteed, in addition, the deep vein pipeline is clamped and fixed through the arc-shaped clamping plates, then the pipeline is fixed in an adsorption mode through gas suction force, and therefore the fixing strength of the deep vein pipeline is improved; therefore, the external anti-interference capability of the pipeline fixing device is ensured.

The application relates to a deep vein thrombus removing stent device which has the advantage of convenient cleaning and comprises a handle assembly, an inner tube assembly, an intermediate tube assembly and an outer tube assembly. The inner tube assembly comprises an inner tube, a conical head assembly and a limiting key. The inner tube is matched with the handle assembly in a mode that the inner tube can axially slide but cannot relatively rotate. The conical head assembly is arranged at the distal end of the inner tube. The limiting key is movably arranged on the handle assembly and selectively acts on the inner tube. The intermediate tube assembly comprises an intermediate tube and a stent fixing assembly. The proximal end of the intermediate tube is connected to the handle assembly, and the distal end is connected to the stent fixing assembly. The outer tube assembly comprises an outer tube which is movably sleeved on the intermediate tube. The thrombus removing stent assembly comprises a self-expanding stent and a braided mesh. The proximal end of the self-expanding stent is connected to the stent fixing assembly. The proximal end of the braided mesh is connected to the distal end of the self-expanding stent. The distal end of the braided mesh is connected to the conical head assembly.

A valvulotome device includes a cage having a proximal end, a distal end, and a longitudinal axis therebetween. The cage includes one or more struts which are radially openable to different diameters, and one or more cutting blades positioned on the one or more struts. A sheath is movable over the cage. Movement of the sheath exposes or covers the one or more struts. A wire extends distally beyond the distal end of the cage. The wire is fixedly coupled to the proximal end of the cage, and the distal end of the cage is free to slide over the wire.

The invention relates to a lower limb deep vein thrombus cleaning device, and belongs to the technical field of medical instruments. The thrombus removal device comprises a thrombus removal mesh basket assembly, the front end is inserted into a catheter in the blood flowing direction and penetrates through a vein valve and thrombus, and the thrombus removal mesh basket assembly is used for cleaning and containing the thrombus at the front end of the vein valve; the rotary telescopic assembly is arranged at the rear end of the thrombus extraction mesh basket assembly and used for controlling the thrombus extraction mesh basket assembly to stretch out, draw back and rotate in the target blood vessel so as to cut or scrape thrombus; the front end of the collecting assembly is inserted into the catheter in the blood flowing direction, abuts against the rear end of the vein valve and is used for cleaning and collecting thrombus at the front end and the rear end of the vein valve. The problem of cleaning blind areas caused by irregular outlines of the vein valve areas is effectively solved, and the thrombus cleaning device has the advantages that thrombus at the front end and the rear end of the vein valve can be cleaned at the same time, cleaning blind areas are effectively reduced, thoroughness of thrombus cleaning is improved, and thrombus residual risks are reduced.

The invention discloses a subclavian deep vein fixing patch and a use method thereof, and belongs to the technical field of vein fixing patches, the subclavian deep vein fixing patch comprises a surface layer isolating membrane, a bottom layer moisturizing membrane and a middle fixing patch, the surface layer isolating membrane and the bottom layer moisturizing membrane respectively cover the upper layer and the lower layer of the middle fixing patch; a small amount of water is arranged at the connecting part of the bottom-layer moisturizing film and the middle fixing patch; and the middle fixing patch is isolated from an external bacteria environment by the surface-layer isolating film and the surface-layer isolating film. The invention provides a subclavian deep vein fixing patch and a using method thereof in order to solve the problems that due to the fact that release paper of an existing fixing patch needs to be completely torn away in advance, positioning is difficult, dressing is prone to displacement, and a catheter is prone to being pulled when the release paper is torn away, and safety risks are caused. The problems that an existing fixing patch is inaccurate in positioning, dressing is prone to being polluted, and a patient is injured due to the fact that a catheter is prone to being pulled when the fixing patch is torn off are effectively solved.

The invention discloses a deep vein rapid blood transfusion and infusion device, and relates to the technical field of medical instruments. The blood and liquid transfusion device comprises a blood container, a pump, a temperature changing device and a bubble catcher, the blood container is provided with a liquid inlet end, a liquid outlet end and a negative pressure end, the liquid inlet end of the blood container is communicated with the liquid suction catheter, the liquid suction catheter is suitable for being communicated with operation field blood, and the negative pressure end of the blood container is suitable for being communicated with a negative pressure source of an operating room; one end of the pump is communicated with the liquid outlet end of the blood container; the liquid inlet end of the temperature changing device is communicated with the other end of the pump, and the temperature changing device is used for keeping the temperature of blood; the liquid inlet end of the bubble catcher is communicated with the liquid outlet end of the temperature changing device, the bubble catcher is used for catching bubbles in blood, the liquid outlet end of the bubble catcher is communicated with the blood transfusion catheter, and the blood transfusion catheter is suitable for being communicated with a deep vein channel. According to the deep vein rapid blood transfusion and infusion device, the blood transfusion and infusion efficiency is improved, and the safety of cardiac surgery is improved.

This invention provides a method for preparing a deep vein catheter and its inner and outer walls with zwitterionic hydrogel coatings. The catheter of this invention includes: a catheter substrate; an adhesive coating covering the inner and outer walls of the catheter; an inner wall coating and an outer wall coating (4); wherein the inner wall coating and the outer wall coating are respectively fixed to the inner and outer surfaces of the catheter substrate by the adhesive coating; and both are zwitterionic hydrogel coatings. By simultaneously constructing this hydration barrier on the inner and outer walls of the catheter, this invention can block platelet adhesion and coagulation pathway activation from the initial stage of thrombosis; at the same time, the semi-interpenetrating network or microgel-reinforced structure significantly improves the mechanical stability and durability of the hydrogel, making it suitable for long-term indwelling catheters.

The application relates to the technical field of balloon catheters, in particular to a high-strength and durable balloon catheter for deep veins, which comprises a catheter and a connecting pipe, the inner wall of the catheter is movably connected with a communicating pipe, one side of the communicating pipe corresponding to the catheter is provided with an iron filament, the outer wall of the catheter is sequentially provided with a polytetrafluoroethylene layer, a toughness layer and a wear-resistant layer, one end of the catheter is fixedly connected with the connecting pipe, the outer wall of the connecting pipe is provided with a balloon main body, the upper end of the balloon main body is provided with a reinforcing layer and a thermoplastic polyurethane layer, the side close to the balloon main body of the connecting pipe is fixedly connected with a displacement section, the material of the balloon main body can be tightly combined with the thermoplastic polyurethane layer and the reinforcing layer, so that the balloon main body is not easy to fall off, the durability of the device is increased, the user can fold the catheter into a shape required by the human body, the use flexibility of the device is improved, the high-strength and durability of the device are increased, and the service life is prolonged.

The utility model discloses a surgical room arteriovenous folding fixed bolster is provided with a T type sliding slot in base, four sliding blocks are connected with T type sliding slot sliding respectively, and the folding support frame is set up on the sliding block one to one correspondence, and the bottom of folding support frame is rotatably connected with the first connecting sleeve surface of sliding block through the damping pivot, and the top of folding support frame is provided with the platform, and the upper surface of platform is provided with the pipeline fixed assembly, the utility model discloses reasonable structure, can properly classify and fix deep vein and two road venous transfusion pipeline and arteriovenous two road pressure sensor four road pipelines, can prevent the pipeline from slipping through the pipeline fixed assembly, and simultaneously through the folding support frame can adjust the position of two road pressure sensor at any time along with the change of the body position in operation, guarantees that pressure sensor and heart are in the same horizontal line, thereby ensures the accuracy of arteriovenous pressure monitoring in operation, guarantees the life safety of patient.

The invention relates to a deep vein transcatheter arteriovenous wall puncture effect-based deep vein transcatheter arteriovenous wall puncture effect-based deep vein transcatheter arteriovenous wall puncture device, and belongs to the technical field of medical surgical instruments, the deep vein transcatheter arteriovenous wall puncture effect-based deep vein transcatheter arteriovenous wall puncture effect-based deep vein transcatheter arteriovenous wall puncture device comprises a guide wire capturing device and a puncture device, one end of the rod body is provided with a guide wire capturing device with the size capable of being released and compressed, and the other end of the rod body is provided with a handle. The puncture device comprises a second long catheter, a puncture tube is arranged in the second long catheter, the puncture tube can linearly move in the second long catheter, and a guide wire is arranged in the puncture tube; the guide wire penetrates out of the puncture tube and is captured through the guide wire capturing device. The arteriovenous access device has the advantages that the guide wire penetrates out of the puncture tube, the guide wire is used for capturing through the guide wire capturing device, and the arteriovenous access of the deep vein transcatheter arteriovenous interventional operation is established.

1. The name of the design product: leg stickers (LS37LA58A). 2. The use of the design product: for deep vein leg stickers, attached to the legs for massage. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1.

The utility model relates to the technical field of medical instruments. A visual treatment towel for hemodialysis comprises a treatment towel body, and the treatment towel body comprises a transparent visual part and a treatment pad towel part which are connected left and right; the center of the transparent visual part is divided into a left transparent visual part and a right transparent visual part which are arranged left and right through an easy-to-tear structure; the treatment pad towel part comprises an inner non-woven fabric water absorption layer and an outer waterproof layer which are arranged inside and outside, and the center of the treatment pad towel part is divided into a left part and a right part which are arranged left and right through an easy-to-tear structure; at least two inner fixing adhesive tapes arranged from top to bottom are fixed on the inner side of the left part, the left ends of the inner fixing adhesive tapes are fixedly connected with the left part, and the inner fixing adhesive tapes are used for fixing the deep vein dialysis catheter; at least three outer fixing adhesive tapes are fixed to the outer side of the left portion, one ends of the outer fixing adhesive tapes are arranged on the left side and the right side of the left portion in a staggered mode from top to bottom, and the other ends of the outer fixing adhesive tapes extend out of the left portion. According to the utility model, the transparent visual part is additionally arranged, so that visual operation is facilitated.

The utility model discloses a preparation device of an ultrasonic microbubble contrast agent for judging the position of a deep venous catheter, which is used for preparing the microbubble contrast agent and comprises a foam maker, an injector and a connector, and the injector is connected with the foam maker through the connector; the foam maker comprises a stirring bin, a driver and stirring fan blades, the stirring bin is connected with the injector through a connector, the stirring fan blades are arranged in the stirring bin, and the driver is arranged outside the stirring bin and connected with the stirring fan blades. According to the utility model, the foam maker is used for automatically foaming, so that rapid, stable and uniform foaming is realized, the consistency of the effect of a microbubble contrast agent is ensured, the foaming efficiency is higher, the quality is more stable, and the imaging effect of the contrast agent is ensured; after foaming is conducted through the foam maker, injection of the microbubble contrast agent can be directly conducted, operation is simplified, consumed time is shortened, microbubble ablation is avoided, and the quality of injection operation of the microbubble contrast agent is effectively guaranteed.

This invention discloses an integrated valved conduit and its preparation method, relating to the field of medical device technology. It aims to solve the problems of traditional valved conduits, such as cumbersome suturing during surgery, risks of tearing and thrombosis, and insufficient adaptability. The integrated valved conduit consists of a leaflet and a conduit, which are sintered together, eliminating the need for sutures and effectively avoiding the risks of reflux and thrombosis caused by suture gaps. A metal shape memory alloy stent is embedded within the conduit wall, providing support to stabilize hemodynamics and prevent conduit collapse, while also enabling endovascular delivery. It is suitable for both open surgical and endovascular implantation methods, and can be used for valved conduit replacement in areas such as the pulmonary artery and deep veins of the lower extremities, restoring damaged valve function.

The invention relates to an arterization system for deep vein transcatheter, and belongs to the technical field of medical instruments, the arterization system comprises a blood vessel wall puncture device and a guide wire capturing device, a first guide wire is sleeved in the blood vessel wall puncture device for sliding along the first guide wire in an artery blood vessel, a puncture structure is further arranged in the blood vessel wall puncture device, and the guide wire capturing device is arranged in the puncture structure. The puncture structure can extend out of or retract into the blood vessel wall puncture device, a second guide wire is arranged in the puncture structure in a penetrating mode, and the puncture structure can puncture the arteriovenous wall; a first guide wire is arranged in the guide wire capturing device in a sleeved mode, the guide wire capturing device is used for sliding along the first guide wire in a vein blood vessel, a capturing and laying structure with the size capable of being expanded or contracted is arranged in the guide wire capturing device, the capturing and laying structure is used for capturing and laying a second guide wire, and the second guide wire is clamped by the capturing and laying structure; the device has the advantages that the arterial blood vessel and the vein blood vessel are communicated through the second guide wire, and the technical problem that the wound of the arteriovenous wall is large due to the fact that the arterial blood vessel is sewn to the vein blood vessel in an open operation in the past is solved.

A deep vein intravenous introducer has a wheel located toward the front end of the device that can be rotated by the index finger of the user. After placement of the needle in the lumen of the vessel, the user rotates the wheel, which turns a drive wheel. The drive wheel has an outer surface that advances the guide wire through the center of the needle and into the patient. Once the guide wire is advanced into the vessel lumen the catheter can be advanced over the guide wire with a hub or finger tab on the catheter close to the index finger. The operation can be performed by one hand without moving the hand from its initial position.

The present application relates to the technical field of medical equipment, and discloses a puncture sheath and medical equipment, the puncture sheath comprising a sheath body, a sleeve assembly, a driving member, a bending adjustment assembly and an inflatable mesh bag; the sleeve assembly comprises an outer sleeve and an inner sleeve; the driving member is arranged on the sheath body and is configured to drive the inner sleeve to move along the extension direction of the outer sleeve; the bending adjustment assembly is arranged on the sheath body and is configured to adjust the bending fixed angle of the sleeve assembly; the inflatable mesh bag is connected to the inner sleeve; the inner sleeve can drive the inflatable mesh bag to extend out of the outer sleeve and unfold, or the inner sleeve can drive the inflatable mesh bag to retract into the outer sleeve and fold. The present application can prevent the sleeve assembly from being uncontrollably bent due to the influence of the internal structure of the human body or medical equipment, and the inflatable mesh bag can be positioned in the human tissue or cavity, and in cooperation with the bending adjustment assembly, the puncture sheath can be prevented from moving and separating from the human tissue or cavity, and can be used to assist in carrying out pulmonary artery thrombectomy, protector recovery, deep vein thrombectomy and other interventional surgeries.

The utility model relates to the technical field of medical instruments, in particular to an ultrasonic pre-positioning device for deep venipuncture, which comprises a base plate, a swash plate and an inclination angle adjusting component. One end of the base plate is movably connected with one end of the swash plate through a movable connecting piece, the other opposite end of the base plate is correspondingly connected with the other opposite end of the swash plate through at least one inclination angle adjusting assembly, and the inclination angle adjusting assemblies are used for adjusting the opening and closing angle between the base plate and the swash plate. An injector groove is formed in the swash plate in the vertical direction, at least one side of the injector groove is correspondingly provided with a vertical graduated scale, and the swash plate is provided with side wings which are located on the two sides of the injector groove in the vertical direction and used for detachably installing an ultrasonic probe on the swash plate. By using the ultrasonic pre-positioning device, the deep vein can be quickly and accurately punctured after the ultrasonic probe completes a deep vein pre-positioning puncture path.

This utility model relates to a deep vein catheter fixation patch, comprising a fixation patch body that can adhere to the skin at the puncture site. An opening for the catheter to pass through is provided on the fixation patch body. A puncture site disinfection pad surrounds the edge of the opening and contacts the skin at the puncture site. The first tip of the catheter passes through the opening and is fixed to the outer surface of the fixation patch body. A heat-sealing film covers the outer wall of the catheter. A second tip of the catheter is fixed to the outer surface of the fixation patch body. The puncture site disinfection pad surrounds the edge of the opening and directly contacts the skin at the puncture site. This continuously disinfects and sterilizes the skin around the puncture site, effectively inhibiting microbial growth. It can fill any gaps that may exist between the catheter and the skin, blocking the pathway for microorganisms to enter the body. The heat-sealing film covering the outer wall of the catheter forms a physical barrier, reducing contact between external microorganisms and the catheter, and preventing microorganisms from spreading along the outer wall of the catheter to the puncture site.

The utility model discloses a pulse type deep venous catheter saline injector which comprises a cylinder body, one end of the cylinder body is provided with a liquid outlet pipe communicated with the interior of the cylinder body, a piston is arranged in the cylinder body in a sliding mode, and the end, away from the liquid outlet pipe, of the piston is fixedly connected with one end of a threaded rod. A threaded rod is arranged at one end of the cylinder, a threaded sleeve matched with the threaded rod is rotationally arranged in the other end of the cylinder, a mounting disc is fixedly arranged outside the other end of the cylinder, a servo motor used for driving the threaded sleeve to rotate is arranged on the mounting disc, and a limiting disc is fixedly arranged at the end, away from the piston, of the threaded rod. According to the utility model, the injection dose deviation caused by manual injection is avoided, and the cleaning degree of washing the deep venous catheter is ensured; due to the fact that the one-way valve is arranged on the liquid outlet pipe, normal saline in the cylinder body can only flow to the outside of the liquid outlet pipe, and the situation that blood flows back to the syringe is prevented.

In various embodiments, an improved catheter insertion device is described that provides an improved flashback response and use for deep vein access. In various embodiments, the improved flashback response comprises two separate and distinct flash events, the first indicating insertion of a cannula in a blood vessel, and a second indicating insertion of a catheter in the blood vessel. The two flash responses are made possible by a combination of features provided on the cannula, such as including a view window in the cannula and a flat relief portion on the outer surface of the cannula at the distal opening.

The utility model discloses shoulder shielding cloth which comprises a square shielding cloth body, the shielding cloth body comprises a base layer, an adhesive layer and a waterproof layer, the base layer, the adhesive layer and the waterproof layer are fixedly connected in sequence from bottom to top, and one end of the shielding cloth body is provided with a neckline corresponding to the neck part of a human body. At least one intubation hole for positioning and inserting a deep vein pipeline is formed in the position, corresponding to the lower portion of the clavicle and the shoulder of the human body, of the covering cloth body in a penetrating mode, and an insertion gap is formed in the side, close to the edge of the covering cloth body, of the intubation hole. According to the utility model, a medical worker can conveniently penetrate a deep vein pipeline into the intubation hole from the insertion gap to carry out intubation operation on a patient, the follow-up intubation nursing requirement can be met, stable protection can be provided for the intubation part after intubation, the infection risk is reduced, a certain warm keeping effect is provided for the patient while the intubation part is exposed, and the intubation effect is improved. The body temperature is maintained, the privacy of the patient is effectively protected, and the use comfort is high.