Abstract: An electro-optical system, apparatus, and method allow long-term, ambulatory measurements to be made on a patient using light transmitted into the patient and resulting light received from the patient.

Abstract: Disclosed are devices, a systems, and methods for determining the dipole densities on heart walls. In particular, a triangularization of the heart wall is performed in which the dipole density of each of multiple regions correlate to the potential measured at various locations within the associated chamber of the heart.

Abstract: An apparel is disclosed. The apparel comprises a base layer, at least one electrode layer arranged on the base layer either directly or through at least one intermediate layer. The at least one electrode layer is made at least partly of a conductive material. The apparel further comprises a flocked fiber layer comprising conductive fiber particles arranged on the at least one electrode layer through flocking.

Abstract: An apparatus includes a housing including a first side and a second side; a chest compression sensor coupled with the second side of the housing; at least one compartment partially formed by one of the first side and the second side of the housing; and at least one removable defibrillator electrode pad contained in the at least one compartment partially formed by one of the first side and the second side of the housing.

Abstract: The instant disclosure relates to a family of devices and methods for both measuring electrophysiological signals and delivering elongate medical devices. In an embodiment, a kit is described that includes a hollow catheter adapted to navigate a patient's vasculature having a hollow lumen terminating at a distal end, structure configured for sensing cardiac electrical activity adjacent the distal end of the hollow catheter and for acquiring electrograms. The fossa ovalis of a subject can be located therefrom and a second medical device can be advanced into and through the hollow lumen to such an extent that a distal tip of the second medical device protrudes beyond a proximal end and the distal end of the hollow catheter at the same time.

Abstract: A system for sensing monophasic action potentials from endocardial tissue of a heart, includes: a plurality of flexible splines; an anchor for securably affixing the proximal portions of the splines; a tip for securably affixing the distal portions of the splines; and a polymeric member including opposed a first open end and a second open end defining an open lumen therein between, where at least one of the plurality of flexible splines is at least partially disposed within the lumen of the polymeric member; a flexible electrode assembly strip with two or more exposed electrodes oppositely disposed on at least a portion of the outer surface of the polymeric member.

Abstract: An atrial fibrillation analyzer includes: an acquisition unit that acquires a waveform signal indicating a temporal change of a pulse wave or an electrocardiogram; an RR interval calculation unit that calculates a parameter corresponding to an average RR interval for each frame on the basis of a spectrum of each frame obtained by frequency analysis of the acquired waveform signal, and calculates an RR waveform signal indicating a temporal change of the parameter; a power calculation unit that calculates a temporal change of power of a predetermined frequency band in a frequency spectrum of the RR waveform signal; a variation coefficient calculation unit that calculates a variation coefficient of the average RR interval; an analysis unit that analyzes presence of atrial fibrillation on the basis of a set of the power and the variation coefficient; and a measurement unit that measures an amount of activity of a user.

Abstract: An atrial fibrillation analyzer includes: an acquisition unit that acquires a detected waveform signal indicating a detection result of a pulse wave or an electrocardiogram; an RR interval calculation unit that calculates, on the basis of a spectrum of each unit period obtained by frequency analysis performed on the acquired detected waveform signal every unit period longer than 4 seconds and equal to or shorter than 16 seconds, a parameter corresponding to an average RR interval of the unit period every unit period; a power calculation unit that calculates power of a frequency band determined in advance in an RR waveform signal indicating a temporal change of the average RR interval calculated by the RR interval calculation unit; and an analysis unit that determines whether or not the power satisfies specific conditions and outputs information indicating presence of atrial fibrillation from the determination result.

Abstract: Implantable medical devices (IMD) configured for implantation within a recess formed in a cranium of a patient, as well as associated methods, are described. In some embodiments, the IMD includes a top external surface and another adjacent external surface, e.g., a side surface, which are oriented with respect to each other to define an acute angle. A connection module for an electrical lead or catheter may be included on the top external surface. Embodiments of the invention may facilitate implantation of an IMD within a recess formed in the cranium of a patient at a location remote to an incision made in the scalp of the patient.

Abstract: Sensor arrangement for sensing activity in a nerve or muscle, the sensor arrangement being arranged to be secured to an insertion member for insertion into a body cavity, the sensor arrangement (2) comprising a support for supporting one or more sensing elements, the support comprising a first zone (10a) and a second zone (10b) spaced apart longitudinally from the first zone, where each of the first and second zones are arranged to be secured to the insertion member to define a fixed spacing therebetween, wherein a plurality of strips (16) comprising one or more sensing elements bridge at least part of the spacing between the first and second zones, the strips being moveable laterally relative to the longitudinal length of the support.

Abstract: A high-performance, broad-band antenna that is small enough to be used in an array for biomedical imaging, yet has an aperture large enough to allow operations in the 1 GHz to 2.7 GHz frequency range. The present antenna advantageously uses a Vivaldi antenna with unique lobe designs to provide a small antenna that provides excellent near field imaging. The ends of each lobe have a tilted half-disc shape that increases the aperture of the antenna without increasing overall size. Other unique features of the lobes include exponential structures and an impedance matching design. Multiple units of the present antipodal Vivaldi antenna can be used in an array of antennas. Such an array, or stack or multiple arrays, can be used in many microwave applications for biomedical imaging.

Abstract: A method for modulating a response signal includes introducing functionalized magnetic particles configured to interact with target analytes into the body, applying a magnetic field sufficient to draw the functionalized magnetic particles towards a surface of the lumen of subsurface vasculature closest to an internally or externally applied mask having a spatial arrangement, and detecting a response signal, which includes a background signal and an analyte response signal, transmitted from the subsurface vasculature. The analyte response signal related to interaction of the functionalized magnetic particles with the target analytes and is modulated with respect to the background signal due, at least in part, to the spatial arrangement of the mask. The target analytes may be non-invasively detected by differentiating the analyte response signal from the background signal due, at least in part, to the modulation of the analyte response signal.

Abstract: A method for determining biological indicators, the method including, in a processing system causing at least one radiation attenuation measurement to be performed and determining at least one first biological indicator using determined radiation attenuation. In addition to this, method includes causing at least one impedance measurement to be performed and determining at least one second biological indicator using a determined impedance measurement.

Abstract: In an embodiment, a system for processing runner data includes a pressure sensor set having a first pressure sensor disposed in a footbed, the first pressure sensor including a first polyolefin sheet and a first gas chamber formed at least in part by the first polyolefin sheet, an electronics module coupled to the pressure sensor set, the electronics module including a first accelerometer, and a second accelerometer.

Abstract: Biometric monitoring devices, including various technologies that may be implemented in such devices, are discussed herein. Additionally, techniques for utilizing gyroscopes in biometric monitoring devices are provided. Such techniques may, in some implementations, involve obtaining swimming metrics regarding stroke cycle count, lap count, and stroke type. Such techniques may also, in some implementations, involve obtaining performance metrics for bicycling activities.

Abstract: The invention relates to a method for determining the presence of a respiratory movement in a human or an animal. This method comprises the detection of a movement by a passive infrared detector and the analysis of signals transmitted by this detector. The invention also relates to an apparatus for executing a method of detecting a respiratory movement.

Abstract: This invention provides a physiological monitoring garment having a band-like configuration and incorporating respiratory, cardiac and temperature sensors. The garment is designed so that it is easily constructed from a few number of separate elements, and so that one garment design can be adjusted to subjects of a range of sizes and shapes. The design is further adapted to require little on no wearer effort during donning or wearer attention during use.

Abstract: A handheld diabetes management device for managing blood glucose test data and continuous glucose monitoring data includes a port configured to receive a test strip, a wireless transceiver, a communications processor, and a user interface processor. The communications processor communicates with the wireless transceiver to periodically collect glucose measurement data from a continuous glucose monitoring device and to store the glucose measurement data in a first data storage module. The communications processor is operable to consume electrical power at a first rate. The user interface processor communicates with the communication processor to receive the glucose measurement data and operable to display the glucose measurement data on the device. The communications processor operates asynchronously from operation of the user interface processor to collect the glucose measurement data and the user interface processor operates to consume electrical power at a second rate that is higher than the first rate.

Abstract: Described are methods and systems for determining clusters of glucose data that can be utilized to provide insights to the person with diabetes, such as, for example, when a certain number of measurements during a predetermined time period is less than a predetermined threshold so that the subject is notified that the number of glucose measurements is less than optimum for management of diabetes.

Abstract: Disclosed herein are systems and methods for a continuous analyte sensor, such as a continuous glucose sensor. One such system utilizes first and second working electrodes to measure additional analyte or non-analyte related signal. Such measurements may provide a background and/or sensitivity measurement(s) for use in processing sensor data and may be used to trigger events such as digital filtering of data or suspending display of data.

Abstract: A method for monitoring an individual engaged in an athletic activity includes detecting movement of the individual at a first time, using a sensor module coupled to the individual, determining that the movement of the individual corresponds to a predetermined activation movement, entering an active state of the sensor module in response to the determination that the movement of the individual corresponds to the predetermined activation movement, and detecting movement of the individual at a second time, using the sensor module in the active state.

Abstract: A new neuro-behavioral test with analysis algorithms has been developed for use in screening individuals for attention deficit hyperactivity disorder (ADHD) and for the quantitative evaluation of ADHD medication/therapy in diagnosed patients. This technique combines a 15 minute auditory-based test of attention with simultaneous EEG monitoring by a wireless, portable data acquisition device. This system acquires both behavioral response (i.e., reaction times to target stimuli, as well as errors of omission/commission) and EEG waveforms. All of the data is simultaneously processed by the algorithms to produce several representative indices. These indices are then combined to produce an overall neuro-behavioral index that represents the degree by which both “behavioral” and “EEG” attention is maintained throughout the test.

Abstract: A seat monitoring system comprises a first layer of one or more fluid bladders packaged within a seat, a pump in fluid communication with the first layer, the pump operable to increase fluid pressure of each bladder within the first layer, an array of one or more sensors in fluid communication with the first layer and operative to sense pressure and pressure changes within each bladder within the first layer and a controller configured to: collect pressure data; determine from the pressure data a monitored parameter relevant to a subject in the seat; and change an aspect of the seat based on the monitored parameter. Methods of using the seat monitoring system can include determining a drowsiness threshold and altering a user that he or she is getting drowsy.

Abstract: To propose an oral cavity sensor capable of analyzing tongue movements in more detail than before. In an oral cavity sensor (1) which is even provided with a sensor element (7) having a mechanical configuration capable of measuring each of external force components in three axis directions, the sensor element (7) can be protected by an elastic body (9), and the whole of the elastic body (9) is covered with the coating film (11a) made of a biocompatible material. Thereby, the sensor element (7) and the elastic body (9) can be safely attached in an oral cavity (MT) of a subject (EXA), and can measure each of the external force components in the three axis directions. As a result, on the basis of the external force components in the three axis directions, complicated tongue movements at the time of mastication or swallowing in the oral cavity (MT) can be analyzed in more detail than before.

Abstract: An allergy testing system comprises a skin test device having a grip portion for holding the device. One or more legs extend from the grip, and each leg is oriented to interact with a well containing a potential allergen. Each leg has a test head, and each test head has a plurality of elongated spike members. The elongated spike members have a sharp end configured to receive the potential allergen from a well and to puncture a patient's skin. In addition, each test head has at least one touch activator. The touch activator is longer than the plurality of elongated spike members, such that during an allergy test, the touch activator comes into contact with the skin prior to the elongated spike members, causing the touch activators to activate nerve tissue that blocks transmission of pain, resulting in a reduction of pain and/or discomfort during testing.

Abstract: A male chastity device utilizes sensors to detect sexual arousal, sexual activity, and/or attempts to tamper with or remove the device. It reports sensed data and/or employs an aversive electric stimulus to discourage the detected unwanted behaviors. The male chastity apparatus includes a structural element wearable on male genital anatomy, and at least one sensor for detecting unwanted activity relating to the male genital anatomy. The apparatus can also include at least two electrodes capable of delivering aversive stimulation to the male genital anatomy. The at least two electrodes can also be capable of delivering pleasurable stimulation to the male genital anatomy. The structural element can also include electrodes for electrically preventing or electrically inhibiting removal of the structural element from the male anatomy.

Abstract: Reference imagery of dermatological conditions is compiled in a crowd-sourced database (contributed by clinicians and/or the lay public), together with associated diagnosis information. A user later submits a query image to the system (e.g., captured with a smartphone). Image-based derivatives for the query image are determined (e.g., color histograms, FFT-based metrics, etc.), and are compared against similar derivatives computed from the reference imagery. This comparison identifies diseases that are not consistent with the query image, and such information is reported to the user. Depending on the size of the database, and the specificity of the data, 90% or more of candidate conditions may be effectively ruled-out, possibly sparing the user from expensive and painful biopsy procedures, and granting some peace of mind (e.g., knowledge that an emerging pattern of small lesions on a forearm is probably not caused by shingles, bedbugs, malaria or AIDS).

Abstract: The present invention relates at least in part to devices which are capable of indicating the presence of moisture. Embodiments of the present invention involve the provision of a solid dispersion of a color-forming material in a hydrophilic polyurethane material. In particular, although not exclusively, the present invention relates to devices comprising foam, e.g., hydrophilic polyurethane foam and a color former. Also included in the embodiments of the present invention are methods comprising the use of the devices, and other subject matter.

Abstract: A portable system is provided for measuring a ketone, such as an acetone, in the breath or other bodily fluid of a user. The system includes a portable measurement device that analyzes fluid samples and generates corresponding ketone measurements. The portable measurement device communicates with an application which runs on a smartphone or other mobile device of the user. The application tracks, and generates graphs of, the ketone measurements, and may include various features for facilitating the analysis of the measurements.

Abstract: Individuals who suffer from certain kinds of medical conditions, particularly conditions that only sporadically exhibit measurable symptoms, can feel helpless in their attempts to secure access to medical care because, at least in part, they are left to the mercy of their condition to present symptoms at the right time to allow diagnosis and treatment. Providing these individuals with ambulatory extended-wear health monitors that record ECG and physiology, preferably available over-the-counter and without health insurance preauthorization, is a first step towards addressing their needs. In addition, these individuals need a way to gain entry into the health care system once a medically-actionable medical condition has been identified. Here, the ECG and physiology is downloaded and evaluated post-monitoring against medical diagnostic criteria.

Abstract: Electrodes providing excellent recording and physical stability. Electrodes are disclosed that may include a plurality of small teeth that possess a novel design shape and orientation. The shallow and relatively long teeth run parallel to the rim of the electrode that presses against the patient's skin. When the electrode is twisted onto skin, the tiny teeth penetrate the stratum corneum and move nearly horizontally under the stratum corneum, thus anchoring the electrode securely to the skin. The electrodes cause minimal discomfort to the patient since the small teeth do not extend to the pain fibers which are located in deeper layers of the skin. The electrodes may be fabricated in a variety of geometries including cylindrical, disk, and blunt bullet or top shapes. In some instances, the electrodes may be connected to detachable leads having magnetic properties.

Abstract: Systems and methods for location coordination between multiple devices are provided. In one example, a method includes receiving by a wearable device, a location signal from a positioning device having location-determining capabilities indicative of the location of the positioning device and calculating a first location of the wearable device based, at least in part, on the location of the positioning device and the strength of the location signal received by the wearable device. The wearable device may include at least one sensor configured to measure at least one physiological parameter.

Abstract: What is disclosed is a system and method for compensating for motion induced artifacts in physiological signals extracted from a video of a subject being monitored for a physiological function in a non-contact, remote sensing environment. The present method identifies a center frequency from a physiological signal obtained from processing a prior video segment. Since a moment to moment change in pulse frequency from one video segment to a next is not very large, signals obtained from sequential video segments can be repeatedly processed and an adaptive band-pass filter repeatedly re-configured and used to filter a next video segment, and so on. Using the teachings disclosed herein, a motion-compensated continuous cardiac signal can be obtained for the subject for continuous monitoring of the subject's cardiac function via video imaging. The teachings hereof provide an effective means for compensating for movement by the subject during video acquisition. Various embodiments are disclosed.

Abstract: A method (500) can comprise performing principal component analysis (PCA) on data corresponding to a subset of a plurality of signals and a selected template to generate a virtual lead and an optimized template (530). The method can also comprise calculating a cross correlation on the virtual lead and the optimized template to determine a strength of linear dependence between the virtual lead and the optimized template to determine regions of interest (ROIs) of the virtual lead (540). The method can further comprise detecting peak correlation coefficients in the virtual lead (550). The method can still further comprise comparing the amplitude of each of the ROIs of the virtual lead with the selected template to determine an error between the template and each ROI of the virtual lead (560). The method can yet further comprise averaging the ROIs to generate averaged data (570).

Abstract: Systems, methods, and computer-readable media are disclosed for identifying when a subject is likely to be affected by a medical condition. For example, at least one processor may be configured to receive information reflective of an external soft tissue image of the subject. The processor may also be configured to perform an evaluation of the external soft tissue image information and to generate evaluation result information based, at least in part, on the evaluation. The processor may also be configured to predict a likelihood that the subject is affected by the medical condition based, at least in part, on the evaluation result information.

Abstract: An MRI system is provided that includes a physiological sensor used for gating the MRI system and an MRI control terminal wirelessly connected to the sensor. The physiological sensor is used to monitor a physiological parameter of a user, such as pressure pulse, and communicate data regarding the monitored physiological parameter to the MRI control terminal. The MRI control terminal processes the data received from the physiological sensor and determines whether a triggering condition on the data is met. When it is determined that the triggering condition is met, the MRI control terminal initiates the acquisition of a data set. The acquisition of the data set involves initiating a pre-programmed pulse sequence and acquiring RF signals emitted from the patient's tissue as a result of the execution of the pre-programmed pulse sequence.

Abstract: This disclosure provides systems, methods and apparatus for processing, transmitting and displaying data received from an analyte sensor, such as a glucose sensor. The system may include a display device with at least one input device. In response to movement of or along the input device, the display device may change a glucose data output parameter and update an output of the display device using the changed output parameter.

Abstract: A detector of a gamma camera is configured such that a radioactive point source is positioned within a field of view at a fixed distance from the detector. A predetermined number of gamma photons emitted by the point source and passed through a collimator are acquired. A system-specific planar sensitivity is computed for a combination of the collimator and detector using the number of gamma photons acquired, a time duration of the acquisition, and precalibrated radioactivity data of the point source corrected for decay that occurred after a precalibration time. A deviation of the computed system-specific planar sensitivity from a class standard sensitivity value for a combination of the radioactive point source, the collimator, and the detector is computed. A class standard sensitivity value for a combination of a radiopharmaceutical, the collimator, and the detector is scaled by the computed deviation, yielding a scaled system-specific sensitivity value for the radiopharmaceutical.

Abstract: The present invention is a method of positioning a horse's foot for radiographic examination which includes attaching to the hoof of the lower limb to be X-rayed a radiolucent pad, and necessary height extension plates, all having the shape of the hoof's footprint in order to elevate the hoof to a level above the standing surface that will position the area of X-ray interest appropriately with the beam of the X-ray collimator. In addition, it is necessary to place a platform of the same or similar height as the pad and its height extensions beneath of the hoof of the opposite foot. The apparatus for attaching the pad to the horse's hoof preferably comprises a pair of overlapping elastic straps.

Abstract: According to the present invention, improved methods and apparatus are provided for providing cushioning and other ergonomic surfaces on devices requiring the patient or tissue to be compressed, such as radiography machines, fluoroscopy units, mammography units and the like. In particular a radiolucent pad element is provided for releasable attachment to at least one surface of a compression device to be used under x-ray, for example, during mammography. The pad element of the present invention can be disposable or constructed to be reusable and in some cases may be applied directly to the patient's breast. Furthermore, a cushioned paddle is provided wherein the compression paddle and the cushion can be separately or integrally formed.

Abstract: A craniostat for an extraoral dental radiographic apparatus includes an upper portion connected to a lower portion by rods. The upper portion includes a crossbeam and rests for a patient's temples, the rests being formed by two arches articulated with the crossbeam. The arches lean on the patient's temples, and are blocked by a control system, which, in one embodiment, is configured as oscillating levers. The blocking action is caused by shape friction generated at the time of activation via the control levers. A method of use of a craniostat is also described.

Abstract: A method and a device are disclosed for automated detection of at least one part of the central line of at least one portion of a tubular tissue structure. In at least one embodiment of the method, characteristic landmarks of the tubular tissue structure are detected in a 3D data record of the tubular tissue structure; the detected characteristic landmarks of the tubular tissue structure and landmarks of a model of landmarks, which model belongs to the tubular tissue structure and takes into account the position of the landmarks relative to one another, are related to one another such that at least one portion of the tubular tissue structure is identified in the 3D data record of the tubular tissue structure. The central line of the identified portion of the tubular tissue structure is determined at least in part on the basis of at least one detected characteristic landmark and/or at least one landmark of the model of landmarks.

Abstract: A method for use in medical imaging of a patient including, with the patient immobilized with respect to an imaging reference frame, acquiring first digital imaging information including a first region of interest using a first imaging modality; processing the first digital imaging information to identify a feature for analysis; and using a second imaging modality to acquire targeted second imaging information for a second region of interest, the second region of interest corresponding to a subset of the first region of interest, wherein the second region of interest includes the feature for analysis.

Abstract: An diagnostic imaging apparatus including: a correction table; a top panel height calculation unit configured to calculate a height of the top panel corresponding to the distance between the fulcrum of the top panel and the imaging position, from an image captured by continuous imaging of the subject; an imaging position estimation unit configured to estimate an imaging position of an image captured by a different imaging method from a method for the captured image based on the height of the top panel calculated by the top panel height calculation unit, the distance between the fulcrum of the top panel corresponding to the height and the imaging position, and the correction table; and an image correction unit configured to align the imaging position of the image captured by the different imaging method with the imaging position of the image captured by the continuous imaging.

Abstract: The present invention relates to a radiographic imaging apparatus and a corresponding radiographic imaging method. The proposed apparatus comprises an X-ray source (20, 108) and a photon counting X-ray detector (40, 110). The X-ray source (20, 108) comprises a rotary X-ray anode (23) having a number of radial slits and a target layer provided on a surface of said rotary X-ray anode in between said radial slits for emitting X-ray radiation when hit by said electron beam. The said photon counting X-ray detector (40, 110) comprises a persistent current sensing and correction unit (70) for sensing a persistent output current in a blanking interval during which no X-ray radiation is emitted by said X-ray source and for using the sensed persistent output current to correct a detector signal in a subsequent measurement interval during which X-ray radiation is emitted by said X-ray source.

Abstract: An X-ray imaging apparatus includes an X-ray source configured to radiate X-rays to a region of a subject, an X-ray detector configured to acquire a plurality of frame images related to the region of the subject by detecting the radiated X-rays, a filter configured to filter the X-rays radiated from the X-ray source, an image processor configured to set a region of interest within the region of the subject based on the plurality of frame images, and a controller configured to control the filter so that X-rays of a lower dose than a dose of X-rays made incident on the region of interest are made incident on a region of non-interest within the region of the subject, and control the X-ray detector so that a gain of the X-ray detector in the region of non-interest is greater than that in the region of interest.

Abstract: An electronic catheter stethoscope measures and analyzes acoustic fields and dynamic pressure variations in the gaseous or liquid fluid inside a conventional medical catheter that is positioned in a patient's urologic, digestive, reproductive, cardiovascular, neurological or pulmonary system. Measurement transducers are installed in a housing connectable to multiple preselected medical catheters. The transducers detect bodily functions that are transmitted to the preselected catheter from within the body. The transducers, housing, electrical interface and signal processing electronics are positioned outside the body.

Abstract: Using three-dimensional mapping images at different time phases obtained by mapping motion information, a peak value of motion information in a local region is retrieved in each of the time phases. On the basis of the result, a locus line or the like indicative of fluctuations with time in the local peak region is generated and displayed so as to be, for example, superimposed on a mapping image. By observing the locus line on the mapping image displayed, the observer can directly grasp the state of the space-time propagation of mechanical excitement of the heart.

Abstract: Method and system for determining a volume of a placenta in utero. The placenta in utero may be modeled as having a convex-concave shape (e.g., like that of a portion of a spherical shell). Volume of the placenta may be determined based on the width (or height) and thickness of the placenta, or based on width, height and thickness of the placenta. Placenta size characteristics may be measured using imaging techniques, such as ultrasound. In one aspect of the invention, a volume of a placenta in utero may be compared to the volume of other placentas for similar gestational age, and a determination regarding whether the placenta volume poses a risk to fetal health may be made.

Abstract: An apparatus for performing measurements in an artery includes a Doppler catheter, comprising a Doppler transducer and a wire connected to the Doppler transducer; and an elongated catheter body having a conduit therein for housing the wire of the Doppler catheter. The body has a proximal end and a distal end; wherein the wire is movable in the conduit relative to the catheter body so that the Doppler transducer and the wire are capable of being threaded into said conduit at the proximal end after the distal end of the catheter has been inserted into the artery, until the Doppler transducer emerges outside the conduit at the distal end of said body for performing ultrasound measurements in the artery. Another embodiment employs at least an additional side transducer for measuring the cross-sectional dimension of the artery useful for computing blood flow.