402 results about "Radial artery" patented technology

A method and apparatus for determining the mean arterial blood pressure (MAP) of a subject during tonometric conditions. In one embodiment, the apparatus comprises one or more pressure and ultrasound transducers placed over the radial artery of a human subject's wrist, the latter transmitting and receiving acoustic energy so as to permit the measurement of blood velocity during periods of variable compression of the artery. In another aspect of the invention, a wrist brace useful for measuring blood pressure using the aforementioned apparatus is disclosed. In yet another aspect of the invention, backscattered acoustic energy is used to identify the location of the blood vessel of interest, and optionally control the position of measurement or treatment equipment with respect thereto.

A method and apparatus for determining the mean arterial blood pressure (MAP) of a subject during tonometric conditions. In one embodiment, the apparatus comprises one or more pressure and ultrasound transducers placed over the radial artery of a human subject's wrist, the latter transmitting and receiving acoustic energy so as to permit the measurement of blood velocity during periods of variable compression of the artery. During compression, the ultrasound velocity waveforms are recorded and processed using time-frequency analysis. The time at which the mean time-frequency distribution is maximal corresponds to the time at which the transmural pressure equals zero, and the mean pressure read by the transducer equals the mean pressure within the artery. In another aspect of the invention, the ultrasound transducer is used to position the transducer over the artery such that the accuracy of the measurement is maximized. In yet another aspect of the invention, a wrist brace useful for measuring blood pressure using the aforementioned apparatus is disclosed.

With an introducing catheter (A) accommodated by a diagnostic-therapeutic catheter (B), the necessity of a sheath is eliminated to render the diagnostic-therapeutic catheter (B) as large as the sheath. This enables a manipulator to fully treat a patient with the use of diagnostic-therapeutic catheter (E). With the elimination of the sheath, the diagnostic-therapeutic catheter (B) is directly inserted into tubular human organs (e.g., radial artery and brachial artery). Coaxially provided are inner and outer tubes 12, 13 with the diagnostic-therapeutic catheter (B) to have an annular space 14, at least a part of which forms a drug-releasable open end 15 exposed to a shaft portion 11. The outer tube 13 has a plurality of drug-releasable side holes 9 to release an anti-spasmodic drug toward a blood vessel through the drug-releasable open end 15.

The invention discloses a noninvasive continuous human body arterial blood pressure measuring method and equipment. The noninvasive continuous human body central arterial blood pressure measuring method comprises the steps as follows: calculating individualization parameters of a to-be-measured person artery blood vessel network model according to acquired pulse wave forms of radial arteries and brachial arteries; calculating radial artery blood pressure systolic pressure, diastolic pressure and blood pressure wave forms according to radial artery pulse wave speeds and artery blood vessel network parameters; calculating ascending aorta-radial artery transfer functions; further calculating central arterial blood pressure. The noninvasive continuous human body central arterial blood pressure measuring equipment consists of a signal processing and analyzing unit, a pulse wave and motion signal acquisition unit worn on the wrist as well as an electro-cardio and motion signal acquisition unit worn in front of the chest. According to the method and the equipment, electrocardiograms, the radial artery blood pressure, the central arterial blood pressure as well as motions and postures are monitored simultaneously, heart rate and electro-cardio morphological parameters are analyzed in various motion states, artery network model parameters and blood pressure parameters, particularly central arterial pressure wave form parameters, are analyzed, and the method and the equipment have great significance for prevention and control on cardiovascular diseases, particularly for prevention and control on high-risk diseases such as the hypertension, the coronary heart disease and the like.

The invention relates to a non-invasive apparatus system for measuring radial artery blood pressure waveform, and its uses in heart rate variability measurement, autonomic nervous system measurement, personal identification, respiratory cycle and cough monitoring, home quarantine, and hospital quarantine thereof.

The invention discloses a cuff-free portable device for monitoring a human physiological parameters and a method. An optical signal receiver inside a shell is connected with a signal amplifying module, a signal filtering module, an A / D conversion module and a singlechip in turn; the singlechip is externally connected with a data storage; a shell connecting strip is tied on the human wrist; and the surface of the shell is provided with a liquid crystal screen. A photoelectric detection module is arranged on the back of the shell and contacted with the body surface skin corresponding to the radial artery; a chip temperature sensor is arranged in the middle of the back of the shell and contacted with the wrist skin; the photoelectric detection module calculates the acquired human body pulse wave light volume description signals to acquire the parameter values of the human blood pressure, blood oxygen saturation, heart rate and respiratory frequency through the extraction of the signal characteristic time and calculation of a signal power spectrum; and a human body surface temperature signal is acquired by the temperature sensor. The cuff-free portable device for monitoring the human physiological parameters can non-invasively, comfortably, accurately display a plurality of human physiological parameters in real time.

A vessel harvesting system that is suitable for harvesting target vessels such as the saphenous vein or radial artery for cardiac artery bypass graft surgery. The system includes a vessel harvesting tool with an elongated cannula and a plurality of surgical instruments therein for separating the target vessels from the surrounding tissue and side branches. The harvesting tool includes a modular handle unit with a base attached to the elongated cannula and a sled that can adapt the base to various types of vessel severing / securing tools, such as tissue welders, bipolar scissors, and bipolar bisectors. The handle unit may be relatively rigid and integrated with the various tool movement controls to facilitate one-handed operation by a user. A severing / securing tool rotation mechanism may be incorporated within the handle and operated by a thumbwheel or other such mechanism. The vessel harvesting system may also provide distal CO2 insufflation for enhanced maintenance of the operating cavity.

A method and a device for non-invasive blood pressure measurement wherein the angle between the hand and the wrist, and the turning angle of the wrist relative to the middle part of the forearm, are kept to the most suitable degree for measuring the blood pressure of the radial artery. At least one pressure bladder and one arterial pulse transducer array are placed on the skin over the radial artery of the wrist to apply the external pressure to the artery and to detect the change of the arterial pulse signals. This method and device can correctly measure the intermittent or continuous blood pressure of the radial artery or the ulnar artery based on the principles of oscillation method and volume compensation method, and effectively eliminate the influence on the measurement due to body movement and the influence on blood circulation and neural function of the hand caused by long-term blood pressure measurement.

The invention relates to a dynamic blood pressure detection and calibration method of a radial artery. The method comprises the following steps: measuring a blood pressure value BP1 to perform first calibration by using oscillography; measuring a blood pressure value BP2 to perform second calibration by using correlation of an electrocardiosignal, a pulse wave signal and human arterial pressure; finally performing continuous monitoring of blood pressure by using the linear relation between pulse wave transmission time difference PWT of two different parts on a wrist and the human arterial blood pressure which are measured at the same time.

The pulse analysis is one of the important measures for Chinese medicine diagnosis. Doctor can understand the health condition of patient based on pulse condition of radial artery of the patient. The present invention provides blood pressure measuring method based on radial artery pulse information. The method includes detecting the pulse wave of radial artery in wrist with one mechanical sensor and detecting electrocardiac signal with two conducting electrode, and then determining artery blood pressure based on the time information extracted from these two signals. The device is calibrated with standard sphygmomanometer before used in continuous measurement of artery blood pressure without using sleeve belt.

A pulse wave measuring device is provided with a plurality of pulse wave measuring units. Each pulse wave measuring unit has a supporting member to which a beam of a pressure measuring device is attached. Contact portions at the distal end of the beam is in contact with the patient's arm, so that piezoelectric elements mounted on the beam measures the stress variation according to pulsation of the patient's radial artery. The supporting member has two pressing legs between which the contact portions of the beam are situated. The distal ends of the pressing legs are also pressed against the patient's arm. The pressing legs are harder than the radial artery. The interval between the pressing legs can be altered by handling a micrometer head. The contact portions are situated back from the distal ends of the pressing legs.

The invention relates to a combined variability index testing method of cardiovascular system and the testing device. The testing method comprises the following steps: (1) collecting the electrocardio-signal, the phonocardio-signal and the pulse signal of radial artery; (2) performing analog-to-digital conversion to the three signals to form the signal oscillogram; (3) identifying and extracting the characteristic point of each signal; (4) constructing the time series RR of electrocardio-period, the electromechanical delay time series and the pulse wave propagation time series of the combined variability index; (5) testing the validity of each time series; (6) calculating the heart rate variability, the electromechanical delay variability and the pulse wave propagation time variability; and (7) calculating the combined variability index of angiocarpy AV. The testing device comprises an electrocardio-signal testing module, a phonocardio-signal testing module, radial artery pulse signal testing module, an analog-to-digital converting device and a computer. The invention enables to reflect the physiological and pathological status of the human cardiovascular system well and has the advantages of high discriminating degree and wide clinic application value.

The invention relates to a traditional Chinese medical science pulse-taking instrument, which comprises a flexible body, a flexible pressure sensor array, an air bag, a signal processing system and a connecting structure; the flexible body is used for arranging the flexible pressure sensor array and the air bag; the air bag covers the side, far away from a wrist, of the flexible pressure sensor array; the connecting structure is used for fixing the flexible body at the wrist of a user. According to a pressure signal collected by the flexible pressure sensor array at the area of the radial styloid process of the wrist, the signal processing system determines the position of the highest point of the radial styloid process, and by combining the position of the highest point of the radial styloid process and a pressure signal collected by the flexible pressure sensor array at the area of a radial artery vessel of the wrist, the positions of Cun-Guan-Chi pulse points are finally determined. The invention further relates to a method for determining the Cun-Guan-Chi positions by using the pulse-taking instrument. The traditional Chinese medical science pulse-taking instrument can automatically search for Cun-Guan-Chi pulse points, and the degree of accuracy, repeatability and usability of the traditional Chinese medical science pulse-taking instrument are improved.

The invention provides a pulse wave acquisition device and a non-invasive blood pressure continuous beat-to-beat measuring system and method. The pulse wave acquisition device of an arm sleeve structure is adopted for the system to acquire brachial artery pulse wave signals and radial artery pulse wave signals, the system is low in power consumption, long in running time and more convenient and more comfortable to wear, and influences of inflation stimulus on an inflatable cuff on blood pressure measurement accuracy are avoided. A hemodynamic force detection analyzer in the system is connected with the pulse wave acquisition device wirelessly, and acquires, calculates and analyzes the brachial artery pulse wave signals and the radial artery pulse wave signals which are acquired by the pulse wave acquisition device; by combining the non-invasive blood pressure continuous beat-to-beat measuring method, non-invasive continuous beat-to-beat measurement of the blood pressure of a detected object is achieved, measurement operation is simplified, measurement accuracy is guaranteed, and the problem that because a non-invasive blood pressure measuring device and method in the prior art are tedious in operation and low in accuracy, continuous beat-to-beat measurement of blood pressure is hard to achieve is solved.

The present invention provides low profile intravascular ultrasound catheters adapted to access sites within the patient's body through narrow blood vessels, e.g., the radial artery. In an embodiment, a low profile catheter comprises an catheter sheath, a short guidewire receiver attached to the distal end of the catheter sheath, and a telescope assembly at the proximal end. The catheter sheath comprises a main portion and a tapered portion for increased flexibility toward the distal end of the catheter. In one embodiment, a rotatable and translatable imaging core is received within the catheter sheath for ultrasound imaging. A short guidewire receiver is used to allow the imaging core to be advanced farther distally with respect to the distal end of the catheter. In an embodiment, the catheter sheath extends through a portion of the telescope assembly to provide enhanced support of the imaging core within the telescope assembly.

A vessel harvesting system that is suitable for harvesting target vessels such as the saphenous vein or radial artery for cardiac artery bypass graft surgery. The system includes a vessel harvesting tool with an elongated cannula and a plurality of surgical instruments therein for separating the target vessels from the surrounding tissue and side branches. The harvesting tool includes a modular handle unit with a base attached to the elongated cannula and a sled that can adapt the base to various types of vessel severing / securing tools, such as tissue welders, bipolar scissors, and bipolar bisectors. The handle unit may be relatively rigid and integrated with the various tool movement controls to facilitate one-handed operation by a user. A severing / securing tool rotation mechanism may be incorporated within the handle and operated by a thumbwheel or other such mechanism. The vessel harvesting system may also provide distal CO2 insufflation for enhanced maintenance of the operating cavity.

The present invention is a method and device for harvesting a vessel. The vessel harvester comprises an internal stenting catheter with proximal and distal ends, a sheath catheter with proximal and distal ends, and a cylindrical cutting tube that is attachable to the distal end of the sheath catheter. The vessel harvester is used to harvest vesseal such as the greater and lesser saphenous veins, the basilic vein, the cephalic vein, and the radial artery.

The invention is suitable for the technical field of biological medicines and medical facilities, and provides a method and a device for measuring blood pressure upon radial artery pulse wave conduction time. The method comprises the following steps: acquiring a human body radial artery pulse wave signal through a photoelectric sensor, and performing filtering amplification and AD (analog-digital) conversion on the human body radial artery pulse wave signal through a microprocessor to finally obtain a human body radial artery pulse wave signal with low noise and obvious feature points; performing frequency-domain transformation, wavelet processing and second order difference on the obtained human body radial artery pulse wave signal to determine the feature points of a human body radial artery pulse wave form; calculating an accurate numerical value of the human body radial artery pulse wave conduction time; establishing a regression equation for measuring the blood pressure to finally obtain blood pressure values. According to the method and the device provided by the invention, the blood pressure only needs to be measured at a single point, so that the processing difficulty of the signal is reduced, a measuring process is simplified, and the comfort of blood pressure measurement is improved; meanwhile, the accuracy of blood pressure measurement is improved through method improvements, and moreover, the blood pressure can be continuously monitored for a long time.

The invention provides a wrist strap type physiological information monitoring device which comprises a device body and a wrist strap enabling the device body to be fixed on the wrist portion of a user. A circumferential adjusting mechanism is arranged on the wrist strap, and the circumferential adjusting mechanism is used for adjusting the position of a physiological signal monitoring unit in the length direction of the wrist strap to enable the physiological signal monitoring unit to be opposite to the radial artery of the wrist of the user when the user wears the wrist strap type physiological signal monitoring device on the wrist to conduct physiological signal monitoring. According to the wrist strap type physiological information monitoring device, the physiological signal monitoring unit can align with the radial artery of the wrist of the user, and the fitting degree of the physiological signal monitoring unit and the radial artery of the wrist of the user can further be improved.

A non-invasion system for measuring the blood pressure and waveform of arteria radialis on wrist of hand is disclosed. It can be used to monitor blood pressure, variation of cardiac rhythm, automatic nerve function, the waveform and frequency of respiration, cough, sneeze, etc and recognize the identity of person.

The embodiment of the invention discloses a non-contact heart rate measurement method and a device based on Euler image magnification, used for solving the technical problems existing in the existingnon-contact heart rate measurement method that the heart rate is great in same-frequency noise interference and is greatly influenced by an environment temperature, isolation signal authenticity lacksjudgment and the like. The non-contact heart rate measurement method and device based on Euler image magnification in the embodiment of the invention comprises the following steps: S1, magnifying tiny change of radial artery jump in a video through an Euler image magnification technology; S2, performing luminance variance statistics on a video frame pixel point luminance channel after magnifyingthe tiny change of radial artery jump in a time domain, performing skin segmentation on the video frame subjected to magnification of the tiny change of radial artery jump, and extracting a radial artery jump area; and S3, performing time-frequency analysis on the radial artery jump area so as to calculate the heart rate.

A “relaxoscope” (100) detects the degree of arterial endothelial function. Impairment of arterial endothelial function is an early event in atherosclerosis and correlates with the major risk factors for cardiovascular disease. An artery (115), such as the brachial artery (BA) is measured for diameter before and after several minutes of either vasoconstriction or vasorelaxafion. The change in arterial diameter is a measure of flow-mediated vasomodification (FMVM). The relaxoscope induces an artificial pulse (128) at a superficial radial artery (115) via a linear actuator (120). An ultrasonic Doppler stethoscope (130) detects this pulse 10-20 cm proximal to the point of pulse induction (125). The delay between pulse application and detection provides the pulse transit time (PTT). By measuring PTT before (160) and after arterial diameter change (170), FMVM may be measured based on the changes in PTT caused by changes in vessel caliber, smooth muscle tone and wall thickness.

The invention discloses a non-invasive central aortic blood pressure measuring method and device. The non-invasive central aortic blood pressure measuring method includes, according to a human artery network model based on viscous fluid mechanics, a method of calculating artery network model personalized parameters of a measured person through measured radial artery and brachial artery pulse wave signals and arm blood pressure values, a method of calculating an ascending aorta-radial artery transfer function and a method of calculating central arterial pressure waveforms through measured central arterial pressures. The non-invasive central aortic blood pressure continuous measuring device comprises a pulse wave signal processing and analysis unit and a radial artery and brachial artery pulse wave signal acquisition unit worn on a wrist. The method is different from an existing general transfer function method, the artery network model parameters of each person to be measured are measured and calculated and the artery network model parameters are numerical characteristics of the cardiovascular system states of the person to be measured with the calculated central arterial pressure waveforms, and the method and device has important meanings in prevention, curing and control of cardiovascular diseases, especially high-risk diseases, such as hypertensions and coronary heart diseases.

The invention discloses a multifunctional radial artery haemostat which comprises a supporting board, a pressure adjusting block arranged on the supporting board, a pressure adjusting screw rod matched with the pressure adjusting block through threads, and a compression block. An elastic element is arranged at the front end of the pressure adjusting screw rod, the compression block is installed on the elastic element, and the end face, opposite to an installation face used for installation of the elastic element, of the compression block is provided with a pressure sensor. The multifunctional radial artery haemostat further comprises hollow fixing belts arranged on the two sides of the supporting board, and an annular air bag installed on the elastic element. Air guiding pipes connected with the air bag are arranged in the fixing belts. The multifunctional radial artery haemostat can achieve hemostasis on a hemorrhagic spot of the radial artery of a patient, can perform detection on the blood pressure and the pulse of the patient and is simple in structure, multiple in function, and capable of providing real-time and effective patient data for condition monitoring of the patient, scientific researches and teaching for medical personnel.

The invention provides an independently researched and developed continuous dynamic blood pressure monitoring device and method based on pulse wave transit time (PWTT) and pulse wave transit velocity (PWV). According to the device, an electrocardiosignal collecting module (104) is arranged on a main case (101) in a wristwatch form, a pulse wave signal collecting module (103) is arranged at the position, corresponding to the wrist radial artery, of a wristband (102), and the electrocardiosignal collecting module (104) and the pulse wave signal collecting module (103) are in signal connection with a control module (105). The device and algorithm can obtain pulse waves in real time, the problem that in-vitro heart pulse waves are inconvenient to obtain is solved, the method for rapidly and accurately obtaining the cardiac ejection time point is provided, and the method is an important part of continuous dynamic blood pressure monitoring.

An illuminated surgical retractor for defining and illuminating a subcutaneous surgical field in the space near a vessel (such as the saphenous vein or radial artery) during a procedure for harvesting the vessel, wherein the illuminated surgical retractor includes a handle member pivotally connected at an acute angle to a first elongate section that has an at least partially tapered width, and includes a second elongate section releasably connected to the first elongate section, wherein a portion of the second elongate section defines an illumination input end portion, which is optically coupled to a light source to substantially illuminate the second elongate section, and further including an insertion area positioned on the proximal end portion of the first elongate section to allow the second elongate section to be inserted into the first elongate section.

The invention provides a device for measuring pulse waves and blood pressures. The device comprises a wrist strap, a pulse wave sensor, a balloon, a gas source, a pressure sensor, a collection unit and a calculation unit, wherein the wrist strap is used for wrapping the wrist of the human body, and the balloon is arranged in the wrist strap and capable of being pressurized and depressurized. The pulse wave sensor is arranged on the wrist strap, and acquires first pulse waves through directly collecting pulse vibration pressure from the radial artery in real time. The gas source supplies gas with the pressure controllable to the balloon. The pressure sensor is arranged on a conveying pipeline of the gas source and the balloon and used for detecting gas pressures in the wrist strap. The collection unit collects the first pulse waves and the gas pressures. The calculation unit is connected with the collection unit and calculates the mean blood pressure, the systolic pressure and the diastolic pressure according to the gas pressures with the pulse waves as correction parameters.

The present invention is a method and device for harvesting a vessel. The vessel harvester comprises an internal stenting catheter with proximal and distal ends, a sheath catheter with proximal and distal ends, and a cylindrical cutting tube that is attachable to the distal end of the sheath catheter. The vessel harvester is used to harvest vesseal such as the greater and lesser saphenous veins, the basilic vein, the cephalic vein, and the radial artery.

The invention relates to a disposable radial artery compression hemostat, which mainly comprises a screw rod, a pressure regulating board and a pressure board, wherein the center of the pressure regulating board is provided with a convex block which is cut with a screw hole in which the screw rod is screwed and connected; the pressure board is connected below the screw rod, and the periphery and the bottom part of the pressure board are coated outside with a thin film; an air bag is formed between the thin film and the pressure board; the bottom surface of the thin film is provided with a gauze cloth; the both ends of the pressure regulating board are provided with penetrating holes which are penetrated by fixed belts. The invention has the advantages that: the disposable radial artery compression hemostat with the structure combines the original spiral type with the air bag type, which can not only maintain the advantages of the two, but can also overcome the deficiencies of the two; the invention can be selected for use under different situations or be used together, so as to achieve a better hemostatic effect. Furthermore, the bottom surface of the thin film is directly provided with the gauze cloth which can not be used again after the usage, so the hemostat can not be used for the second time, and the disposable method can avoid the risk of cross infection which is caused by a plurality of uses.