268 results about "Radial artery" patented technology

The invention relates to the technical field of medical apparatus and instruments, in particular to a pressure-visible automatic decompression radial artery compression hemostat which comprises a base, a fixing box is fixedly mounted at the upper end of the base, two sets of fixing rods are fixedly connected to the two sides of the base, and the outer surfaces of one set of fixing rods are movably sleeved with a bandage. A radial artery pressing block is installed at the bottom of the base, and a pressing mechanism is arranged in the fixing box. Through the arrangement of the compression mechanism, the pressing distance of the hemostatic pad is controlled according to a set pressure value, the pressure reduction time and the number of turns of the threaded rod driven by the automatic control driving motor to rotate are set according to the time point needing pressure reduction and the amount needing pressure reduction, the pressing strength on a puncture part is reduced every time when the pressure reduction time point is reached, and the puncture effect is improved. The situation that a doctor cannot adjust the hemostat in time is avoided, the doctor is reminded to check and observe whether the skin color of the puncture part of the patient is abnormal or not through the loudspeaker and the wireless communication module, and therefore pressure can be adjusted in time.

The invention discloses a non-invasive hemodynamics monitoring method and system based on deep learning, and relates to the technical field of medical instruments, and the method comprises the steps: obtaining invasive blood flow data and non-invasive radial artery waveform data of a corresponding time point; time reference alignment is carried out on invasive blood flow data and non-invasive radial artery waveform data through time points, time drift errors between invasive and non-invasive equipment are eliminated, an initial non-invasive detection model is constructed, the method better fits the actual state of non-invasive detection, non-invasive feature vectors are used as input features after vascular elasticity compensation processing, and the non-invasive detection accuracy is improved. The initial non-invasive detection model is trained by taking blood flow parameters in the invasive data set as supervision annotation data, so that the consistency of model output and real invasive blood flow parameters is improved, 'waveform fragment-blood flow parameter 'space-time mapping is established, the running dynamic state of the non-invasive detection model is evaluated and analyzed, and the detection accuracy is improved. The performance change of the model in the training and running process can be monitored in real time, and convergence, over-fitting and under-fitting problems can be found in time.

The invention belongs to the technical field of radial artery compression haemostat, and relates to an intelligent control system and method for a radial artery compression haemostat, and the method comprises the steps: determining the adaptive initial pressure of the radial artery compression haemostat for a target patient through combining the individual medical representation angle and historical experience reference angle of the target patient; the initial hemostasis effect of the radial artery compression hemostat on the target patient is evaluated, the adaptive initial pressure is continuously corrected until the initial hemostasis effect reaches the expectation, and then the hemostasis condition of the target patient is monitored in real time to judge whether the preset decompression decision condition is met or not; the method comprises the following steps: executing pressure reduction operation of the radial artery compression hemostat, evaluating and feeding back the pressure reduction operation reasonability of the radial artery compression hemostat for a target patient, and executing wearing release prompt operation of the radial artery compression hemostat when the pressure balance state of the radial artery compression hemostat lasts for a preset duration. And highly intelligent and personalized management of the radial artery compression hemostat is realized.

The application discloses a preparation method of a resistance / capacitance dual-response MXene-based hydrogel flexible sensor, and the hydrogel flexible sensor is prepared by combining a microstructure hydrogel prepared from polyacrylamide, gelatin and MXene with an interdigital electrode. The hydrogel flexible sensor can simultaneously detect resistance response signals and capacitance response signals. The detected resistance and capacitance signals are complementary to each other, the single response signal mode of the flexible sensor is widened, the mutual calibration of the same group of data is realized, and the detection precision of the flexible sensor is improved. The MXene-based hydrogel flexible sensor is applied to the detection of human biological signals, for example, carotid artery pulse detection and radial artery pulse detection.

The invention belongs to the technical field of medical equipment, and particularly relates to a cardiovascular intervention postoperative radial artery compressor which comprises a U-shaped base, a rubber sleeve is fixedly connected to the inner wall of the bottom end of the U-shaped base, a metal iron plate is fixedly connected to the upper surface of the rubber sleeve, and an auxiliary mechanism is fixedly connected to the outer wall of the metal iron plate. The radial artery compressor has a compression force visualization function, can help medical care to precisely regulate and control compression force, formulate a personalized scheme, facilitate real-time monitoring and data analysis, reduce the complication risk of a patient and improve the nursing effect, also has a skin heat preservation function, can promote local blood circulation, accelerate wound healing and relieve discomfort of the patient, and has a good application prospect. And the compressor has the functions of stabilizing a punctured arm and adjusting the height, and is beneficial to venous return, swelling reduction, reduction of blood deposition at a puncture point and improvement of the use reliability and effect of the compressor.

Some embodiments of percutaneous ventricular assist devices have an expandable pump impeller and an associated flexible drive shaft. The drive shaft can be coupled to a motor located external to the patient. The motor can rotate the drive shaft to spin the pump impeller inside of the pump housing, causing blood to be pumped within the patient. In some embodiments, the pump impeller is inflatable and / or self-expandable. The percutaneous ventricular assist devices with inflatable or self-expandable pump impellers are designed to have very small delivery profiles. Accordingly, various deployment modalities, including radial artery deployment, are practicable using the two-part percutaneous ventricular assist devices described herein.

A method, a computer-readable medium and a system for reconstruction of a patient-specific central aortic pressure waveform morphology using a non-invasive distal pressure measurement and a non-invasive recording of a distal pressure waveform are disclosed. Measurements of patient's systolic and diastolic pressures as well as patient's heart rate are made at a distal position, for example using the radial artery. The invention makes use of patient-specific demographic and health data, e.g., gender, age and / or current medication. The patient-specific central arterial pressure waveform morphology is calculated using a lumped-parameter multi-compartment model of the Windkessel type. The method does not assume structural rigidity of a transfer relationship, but it assumes an evolutionary law that provides the relationship between distal and proximal pressures. The invention provides values of a central arterial blood pressure and of a proximal flow rate which are useful in diagnosis of an elevated heart pressure or hypertension or both. The method has been validated using clinical trials. The method of the invention reproduced the values obtained using invasive methods from the clinical trials.

The utility model relates to the technical field of medical apparatus and instruments, and discloses a radial artery compression hemostat which comprises a fixing assembly and a fixing assembly, the fixing assembly comprises a fixing plate and a fixing band, and the fixing band is connected with the fixing plate end to end; the adjusting assembly comprises an adjusting part and a driven part, the adjusting part is arranged on one side of the fixing plate, the driven part is arranged on the other side of the fixing plate, and the driven part penetrates through the fixing plate and extends into the adjusting part; the hemostasis assembly is arranged at the end, away from the adjusting piece, of the driven piece. According to the radial artery compression hemostat, by arranging the detection assembly tightly attached to the arm, when the radial artery compression hemostat is used for stopping bleeding of a puncture part, under the effect that the detection assembly monitors the blood oxygen saturation of a patient, sound-light alarm prompt can be automatically triggered when the blood oxygen saturation exceeds a set range; medical staff are reminded to adjust the compression pressure of the hemostat in time, and the situation that a patient is uncomfortable or injured due to excessive or too loose compression is avoided.

The utility model provides an electronic radial artery compressor, which relates to the technical field of medical devices, and solves the defects in the structural design of the radial artery compressor in the prior art, the relative displacement between the inflatable cuff and the puncture point is easy to occur, and the pressure sensor has a high detection error, which affects the hemostasis effect. During the inflation and pressurization process, the cuff body of the utility model drives the compression structure to form a compression effect on the puncture point of the radial artery. At the same time, the pulse sensor detects the pulse of the radial artery in real time until the pulse of the radial artery cannot be detected. The cuff body stops inflating and maintains the current pressurization state to achieve hemostasis of the puncture point of the radial artery. And because a limiting structure is set on one side of the compression structure, the limiting structure fits tightly with the skin around the puncture point, and can keep the relative position of the compression structure and the puncture point of the radial artery unchanged during the inflation and pressurization process, ensuring the accuracy of the pulse sensor detection process and the real-time feedback response.

The invention provides a radial artery radiography cannula, and relates to the technical field of medical instruments, the radial artery radiography cannula comprises an inner tube and an outer cannula, the inner tube comprises an inner tube catheter seat and an inner tube body, the outer cannula comprises an outer cannula catheter seat and an outer cannula body, the inner tube catheter seat is provided with a connector part, and the connector part can be connected with the outer cannula catheter seat in a matched mode. The inner tube body penetrates into the outer tube body, the outer tube and the inner tube can be locked and matched through the connector part and the outer tube catheter base, the adaptability is good, gas embolism or thrombus is not prone to being caused, the end of the middle cavity is sealed through the locking position, blood cannot overflow, and the influence on surgical operation is avoided; the inner tube and the outer tube are synchronous when a large blood vessel on an arch is subjected to super-selection, the outer tube and the inner tube are separated after the outer tube points to a target blood vessel, super-selection is conducted towards the far end to the target blood vessel under the support of the guide wire and the inner tube, the controllability of the catheter is improved, and the super-selection difficulty is reduced.

The invention provides a radial artery compressor control method and related equipment, and can be applied to the technical field of image processing. The method comprises the following steps: acquiring a first laser blood image acquired by an image acquisition component for a hand region of a target object; determining a target speckle contrast according to the pixel intensity of the pixel points in the first laser blood image, and determining the current blood flow rate of the hand region according to the target speckle contrast; under the condition that the current blood flow rate indicates that the radial artery has the occlusion risk, the ulnar artery air bag is controlled to deflate, and target pressure is determined according to the maximum pressure pulse wave amplitude of the target object in the ulnar artery air bag deflation process; and the ulnar artery air bag is controlled to be inflated until the pressure applied to the ulnar artery by the ulnar artery air bag reaches the blocking pressure, and the radial artery air bag is controlled to be inflated or deflated until the pressure applied to the radial artery by the radial artery air bag reaches the target pressure. In the application, the blood flow of the radial artery is ensured to be smooth so as to avoid radial artery occlusion.

The invention provides an early warning system and method for a radial artery compression hemostat based on multiple sensors, and belongs to the technical field of complication early warning. The method comprises the steps that S1, multiple types of physiological signals of a radial artery compression area are synchronously collected and subjected to digital processing; s2, discrete wavelet transform is carried out on the proximal end temperature and the telecentric end temperature; performing time domain analysis on the pulse signal, and extracting to obtain pulse amplitude; s3, constructing a temperature distribution model of the compression area based on the temperature difference signal; s4, the resistivity distribution of the compression area is reconstructed through the electrode impedance signal, and the errhysis position is positioned; s5, calculating a pressure change rate based on the pressure digital signal; calculating a pulse amplitude attenuation rate based on the pulse amplitude; and fusing the pressure change rate, the temperature gradient vector, the pulse amplitude attenuation rate and the errhysis index through a weighted summation formula to obtain a comprehensive risk value. According to the invention, through multiple types of sensors, the complication related parameter coverage rate is improved, and the complication early warning timeliness and accuracy are improved.

The present invention belongs to the technical field of radial artery hemostatic devices, and specifically relates to a radial artery hemostatic device with automatically set pressure, which includes an elastic ring. The elastic ring has a notch and an elastic connecting piece is fixedly connected at the notch. Rubber contact blocks and pressing blocks are fixedly installed on the inner diameter wall of the elastic ring to increase the friction force. A pressure application component is installed on the outer diameter wall of the elastic ring. By adopting the cooperation of the pressure application component and the limiting component, the gas pressure can be quickly transmitted into the pressing block and the affected part of the patient can be quickly compressed. At the same time, the limiting component can adjust the pressure on the pressure application component, thereby controlling the pressure application component to reduce the required pressure, and automatically relieve pressure when the affected part swells, avoiding adverse effects on the body caused by long-term swelling of the affected part.

The invention discloses a coronary intervention postoperative radial artery compression hemostat, relates to the technical field of hemostat equipment, and provides the following scheme that the coronary intervention postoperative radial artery compression hemostat comprises a radial artery compression binding belt assembly, and a wrist lining plate assembly is embedded and fixed to the surface of the bottom of the radial artery compression binding belt assembly; and two skin compressing breathable assemblies are embedded and fixed on the surface of the bottom of the wrist lining plate assembly. According to the technical scheme, the radial artery compression binding belt assembly is used for conducting compression hemostasis on the radial artery of the wrist, the effect of compressing the radial artery at the far end is achieved, meanwhile, the wrist lining plate assembly and the skin ventilation assembly are inlaid in the bottom of the binding belt assembly, and the bottom of the wrist is supported through the wrist lining plate; in addition, by means of the combination of a servo motor, a paddle and an electric heating plate, cold and warm air flow ventilation can be achieved for the skin of the pressed area in the pressing environment, and the skin of the pressed area is prevented from being pruritus.

The invention discloses a thin, thick, smooth and astringent pulse condition presentation device, which belongs to the field of medical teaching equipment, and is characterized by comprising a liquid storage tank, a pump body, a bionic blood vessel, a bionic arm, bionic blood and a pipeline, the plurality of liquid storage tanks are respectively used for containing bionic blood and cleaning liquid which are made of different materials; each liquid storage tank is provided with a liquid inlet pipe and a liquid outlet pipe, and the pump body extracts bionic blood through the liquid outlet pipe; an outlet of the pump body is connected with the proximal end of the bionic blood vessel through a pipeline, and blood is pumped into the bionic blood vessel through the pump body; the telecentric end of the bionic blood vessel is connected with the liquid inlet pipe of each container; the bionic blood vessel is located at the radial artery of the bionic arm and simulates the pulses of three acupuncture points of Cun, Guan and Chi on the radial artery of the arm; sand grains or particles made of other materials are contained in the liquid storage tank showing the astringent feeling; and a stirrer is arranged on the liquid storage tank which shows astringent feeling. Compared with the prior art, thin, thick, smooth and astringent pulse feeling can be presented.

The invention relates to the field of non-invasive monitoring, and particularly provides a method for evaluating vascular elasticity through radial artery pulse waves. The method comprises the following steps that 1, radial artery pulse waves are obtained; step 2, preprocessing the radial artery pulse wave to obtain an average pulse period; 3, calculating a dominant wave angle based on the average pulse period; step 4, calculating pulse duration based on the average pulse period; step 5, calculating rise time based on the average pulse cycle; step 6, calculating a main wave amplitude based on the average pulse period; step 7, calculating a waveform area based on the average pulse period; and 8, establishing an evaluation model, inputting the dominant wave angle, the pulse duration, the rise time, the dominant wave amplitude and the waveform area into the evaluation model, and outputting a vascular elasticity predicted value by the evaluation model. According to the method, the accuracy of predicting the vascular elasticity is high, and the cost is low.

The present invention relates to the technical field of non-invasive radial artery visualization devices, and in particular to a device for non-invasive visualization of the blood flow, curvature and diameter of the radial artery. The technical solution includes: a chassis, in which an OCT scanner and a fixing sleeve for fixing the arm are installed, and an imaging auxiliary component installed inside the chassis, and the imaging auxiliary component drives the OCT scanner to move synchronously with the fixing sleeve when the fixing sleeve moves. The present invention uses the fixing sleeve to assist in fixing the hand, and through the imaging auxiliary component, when the hand moves, the moving hand can drive the OCT scanner to move synchronously, so that the OCT scanner and the arm remain relatively still, preventing image blur or distortion, and effectively improving the quality of imaging.

The utility model discloses a direct-viewing pressure feedback type radial artery compressor, and belongs to the field of medical instruments. A direct-view pressure feedback type radial artery compressor comprises a fixing plate, a pressure feedback device and a pressure feedback device. The bandage is arranged at one end of the fixing plate and binds the fixing plate to the arm of the patient; the direct-viewing pressure feedback type radial artery compressor further comprises a pressure applying piece and a pressure feedback piece, wherein the pressure applying piece is movably arranged on the fixing plate; the driving group is arranged on the fixed plate and is used for driving the pressure applying piece to move; the air bag is arranged on the pressure applying piece, located at the lower end of the pressure applying piece and abutted against the arm of the patient; the pressure indicating piece is arranged on the pressure applying piece in an up-down sliding manner; an air hole communicated with the air bag is formed in the pressure applying piece; the pressure indicating piece is arranged in the air hole in an up-down sliding mode. The direct-view pressure feedback type radial artery compressor has the beneficial effect that the direct-view pressure feedback type radial artery compressor with the indication function is provided.

The utility model discloses a dressing patch for fixing a catheter for HAIC treatment, which comprises a dressing patch main body, the back of the dressing patch main body is provided with an adhesive layer and is matched with a release layer, the dressing patch main body is provided with an inward concave area which is limited as a puncture area, and the adhesive layer is provided with an adhesive tape. A first auxiliary patch is arranged on the upper side of the inwards-concave area and used for fixing the catheter sheath in the mode of being attached to the skin. In the HAIC pipeline fixing nursing process, various fixing modes of the radial artery and the femoral artery under a common catheter or a micro catheter can be achieved; the pipeline can be arranged in a U-shaped mode, an S-shaped mode and a bending and coiling mode.

The utility model discloses a radial artery hemostat with timing and reminding functions, belongs to the technical field of medical auxiliary instruments, and aims to solve the problems that as the radial artery hemostat does not have the timing and reminding functions, nerve injury can occur and the occurrence rate of radial artery occlusion can be increased after the radial artery hemostat compresses the radial artery for a long time. Elastic bands are hinged to the two sides of the fixing plate, a threaded rod is installed at the top end of the fixing plate in a threaded mode, a pressurizing block is rotatably installed at the bottom end of the threaded rod, a screwing head is fixedly installed at the top end of the threaded rod, and installation blocks are fixedly installed at the positions, located on the two sides of the threaded rod, of the top end of the fixing plate; limiting grooves are formed in the opposite sides of the mounting grooves; through the arrangement of the electronic timer and the loudspeaker, medical staff can time conveniently when a patient uses the radial artery hemostat, the use time of the radial artery hemostat can be controlled conveniently, and the situation that the radial artery hemostat is used for a too long time and influences the radial artery of the patient is avoided as much as possible.

The utility model discloses a radial artery compression tourniquet, which comprises a compression block, a tourniquet body and a tourniquet body. The limiting piece is arranged above the pressurizing block; and the fixing belt is provided with an open hole matched with the limiting piece. The bottom of a pressurizing block is pressed on a gauze ball, then one end of a fixing band is clamped to the pressurizing block through an open hole, the other end of the fixing band is wound around the wrist of a patient, and the other end of the fixing band is embedded into a limiting piece through an open hole in the upper portion of the limiting piece, so that the gauze ball is pressurized through the pressurizing block, and the pressurizing block is fixed through the fixing band; automatic pressurization and fixation are achieved, manual pressing is not needed, nursing human resources are greatly saved, the nursing work efficiency is improved, part of gauze balls can enter hole grooves, friction force between pressurization blocks and the gauze balls can be increased, and dislocation of the gauze balls during pressurization is avoided; and the tightness can be conveniently adjusted.

The present invention discloses a stroke / infarction early warning method and system based on dynamic monitoring of radial artery. The present invention adopts wearable devices in pulse data collection, realizes real-time data collection, analysis and early warning, and effectively copes with the sudden characteristics of stroke. At the same time, based on the intelligent system and networking communication function of the wearable device, clinical accompanying symptom data can also be selectively uploaded to ensure the accuracy and timeliness of the data.

The invention relates to the field of medical instruments, in particular to a portable heart disease interventional therapy machine. A portable heart disease interventional therapy machine integrates a combined therapy table, a heart ultrasonic developing system and a closed disinfection mechanism. The combined treatment table comprises the supporting box which can be unfolded to form a treatment platform, and is convenient to store and carry. The cardiac ultrasound developing system obtains cardiac information by using a transothoracic echocardiography device. A disinfection assembly of the closed disinfection mechanism realizes efficient disinfection and flushing of the guide wire and the catheter through an ultraviolet disinfection part and a flushing part; the leading-in tube of the leading-in assembly guides the guide wire and the catheter, and the tail end sheath tube ensures that the guide wire and the catheter smoothly enter the radial artery. All parts of the device cooperate with one another, and a convenient, safe and efficient comprehensive solution is provided for heart disease interventional therapy from the links of device portability, heart evaluation, instrument treatment and introduction and the like. The problem that an intervention guide wire and a catheter of existing simple portable interventional therapy equipment for heart disease interventional therapy can be polluted by dust and bacteria in air is solved.

A wearable device for measuring blood glucose and blood pressure for a user includes a main body including a first side and a second side formed on the opposite side of the first side; a first supporting frame protruding from the first side and a second supporting frame protruding from the second side; a belt portion having a first belt end detachably coupled to the first supporting frame, a second belt end detachably coupled to the second supporting frame, and at least one aligning mark, wherein the belt portion is positioned around a wrist of the user; wherein the main body includes at least one pressure sensor array assembly overlaid on a radial artery of the user; wherein the pressure sensor array assembly includes a plurality of apertures arranged one after another to form a cross-shaped pattern and at least four sensor elements arranged in a symmetrical configuration.

The utility model discloses an adjustable hand insertion plate device for radial artery interventional operation, which comprises an operating bed and a mattress, and further comprises a fixing plate, a rotating component, a lifting component, a lifting component and an arm bracket, the mattress is placed on the operating bed, the fixing plate is positioned on one side of the mattress and is connected below the mattress in an inserted manner, and the rotating component is positioned on the fixing plate. The rotating assembly is located on one side of the fixing plate and connected to the fixing plate, the lifting assembly is located at one end of the fixing plate and connected with the fixing plate through the rotating assembly, one end of the lifting assembly is connected to the upper portion of the lifting assembly, and the arm bracket is located above the lifting assembly and connected to the lifting assembly. The arm bracket can be rotationally stored below the operating bed through the rotating assembly, and the arm bracket is prevented from hindering a patient when the patient passes through the bed.

A wrist blood pressure monitor (100) includes a main body portion (10), a band-like member (20), a sensor cuff (22), and a pressure cuff (23). The band-like member (20) includes a first end portion and a second end portion positioned in a width direction. In a first state in which the band-like member (20) is wrapped around a left wrist, with the first end portion positioned on a finger side of a left hand, the second end portion positioned on an elbow side of the left hand, and the main body portion (10) disposed on a side surface (60c) of a left arm (60) on a thumb side of the left hand, the sensor cuff (22) is disposed so as to be capable of compressing a radial artery (63) of the left wrist from a front surface side (60d) of the left arm (60) on a palm side.In a second state in which the second end portion is positioned on a finger side of a right hand, the first end portion is positioned on an elbow side of the right hand, and the main body portion (10) is arranged on a side surface of a right arm on a thumb side of the right hand, the sensor cuff (22) is arranged to be capable of compressing a radial artery of a right wrist from a front surface side of the right arm on a palm side.

The invention belongs to the technical field of medical treatment, and discloses an interventional postoperative radial artery compressor capable of preventing compression injury, which comprises a compression belt, the compression belt is connected with a first connecting belt and a second connecting belt, the upper end of the first connecting belt is provided with a plurality of friction belts, and the lower end of the second connecting belt is provided with a magic tape. Medical cotton is arranged at the lower end of the compression belt, a local compression structure is arranged at the lower end of the compression belt, a friction belt arranged on a first connecting belt is matched with a hook-and-loop fastener arranged on a second connecting belt, the pressure between the compression belt and a patient can be adjusted, and then the local part of the patient is extruded and fixed through a pressure plate; and the pressure sensor arranged at the lower end of the pressure plate can transmit the pressure value to the receiving display at any time, so that a worker or a family member can conveniently adjust the pressure value.

The invention discloses a central arterial pressure waveform reconstruction method based on a CBL-iTransform model, and relates to the technical field of central arterial pressure evaluation. According to the method, a waveform reconstruction model (CML-iTransform) is obtained through the design of the method, the waveform reconstruction model is based on an improved iTransform architecture, and a one-dimensional CNN and a BiLSTM network are fused, so that the data feature extraction capability in the waveform reconstruction process is remarkably improved, and reconstruction from an RAP waveform to a CAP waveform is realized; wherein the RAP waveform is firstly input into the feature extraction module, then the reconstructed CAP waveform is output through the waveform reconstruction module, the data sample size is expanded through data enhancement, and the model performance is improved; compared with a traditional method and several deep learning network models, the model capable of capturing long and short-term memory dependence is superior to other methods in the aspect of reconstructing the central arterial pressure from the radial arterial pressure, and it is proved that the model is good in reconstruction performance.

The utility model discloses an adjustable radial artery fixing device in the technical field of medical supplies, which comprises a hand placing plate, a leather cushion is arranged on the outer side of the hand placing plate, a first bandage used for fixing a wrist is arranged on the hand placing plate, a second bandage used for hemostasis by compression when puncture fails is arranged on one side of the first bandage, and the first bandage and the second bandage are arranged on the other side of the hand placing plate. One side of the second bandage is provided with a third bandage used for fixing the hand placing plate, one side of the third bandage is provided with a fourth bandage and a fifth bandage, and the fourth bandage and the fifth bandage are used for fixing the palm. Due to different wrist sizes and different dorsal flexion amplitudes of palms of patients, the puncture success rate is low, and the occurrence rate of repeated puncture complications is obviously increased. The problems that after one-time puncture fails, a medical worker needs to conduct pressing hemostasis on a puncture point for 5-10 min, physical and psychological pain is brought to a patient, meanwhile, the working intensity of the medical worker is increased, and the working efficiency is greatly reduced are solved.

A needle-injection catheter includes a catheter body having a distal end, a proximal end, a stiff proximal portion, a flexible distal portion, and a delivery lumen extending therethrough. In a first embodiment, a straight injection needle extends coaxially from a distal tip of the flexible portion of the catheter body, and a plurality of penetration limiting elements positioned circumferentially about a base of the straight injection needle and configured to fold radially inwardly against a shaft of the needle when constrained in a tubular lumen and to extend radially outwardly when unconstrained. In a second embodiment, a helical needle extends from the distal tip of the flexible portion of the catheter body. The helical needle has at least one helical delivery lumen connected to receive an injectable substance from the delivery lumen of the catheter body.