392 results about "Pulse pressure" patented technology

An implant for bone replacement and attachment in an animal's body including, a structural portion having an outer porous surface, a ceramic material applied to the porous surface of the structural portion, characterised in that the thickness of the ceramic material as applied utilizing pulsed pressure MOCVD is such that at least some of the pores of the porous surface are not completely closed.

An apparatus and method for measuring exercise quantity through a film-type pressure sensor are provided. The apparatus for measuring exercise quantity through a film-type pressure sensor comprises a film-type pressure sensor to sense pulse pressure of a user's body, a main body to calculate and display a heart rate (HR) and calories consumed based on the HR, and a band that is coupled to the main body and to which the film-type pressure sensor is attached. The band contains a first band portion which is coupled to the main body and a second band portion which contains the film-type pressure sensor and is coupled to the first band portion. The second band portion contains at least one projection to enhance the detection of the pulse pressure of the user.

Provided herein are implantable systems, and methods for use therewith, for monitoring a patient's arterial blood pressure. Electrode(s) implanting within and/or on the patient's heart are used to obtain a cardiogenic impedance (CI) signal indicative of cardiac contractile activity. Additionally, a signal (e.g., PPG or IPG signal) indicative of changes in arterial blood volume remote from the patient's heart is obtained using a sensor or electrodes that are implanted remote from the patient's heart. One or more metrics indicative of pulse arrival time (PAT) are determined, where each metric can be determined by determining a time from one of the detected features of the CI signal to one of the detected features of the signal indicative of changes in arterial blood volume. Based on at least one of the metric(s) indicative of PAT, arterial blood pressure is estimated, which can include determining values indicative of systolic blood pressure, diastolic blood pressure, pulse pressure and/or mean arterial blood pressure, and/or changes in such values.

The apparatus and methods of the present invention provide a non-invasive measurement of blood pressure with a frequency that approximates a continuous measurement. Blood pressure measurement provides information that is both clinically and diagnostically significant. In accordance with an aspect of the present invention, a method for providing a non-invasive measurement of blood pressure, includes obtaining a first input signal and a second input signal indicative of occlusive measurements of systolic blood pressure and diastolic blood pressure, respectively; tracking a signal indicative of pulse pressure; continuously measuring a third signal indicative of mean blood pressure; and processing the signals to obtain a measurement indicative of systolic and diastolic blood pressure, wherein at least a portion of the measurement indicative of systolic and diastolic blood pressure is continuous. The second input signal indicative of diastolic blood pressure is analyzed to identify a maximum amplitude of the signal, the maximum amplitude being indicative of the diastolic blood pressure measurement.

An approach for improving the chances of survival of an individual who has received a trauma including, for example, hemorrhage or blunt injury, by providing more relevant information regarding the individual to first responders including at least one of heart rate variability index value, a baroreflex sensitivity value, and a pulse pressure. This information being used in at least one implementation to provide medical treatment to injured individuals including dispatching assistance and/or prioritizing in a triage situation increasing the speed at which these decisions can be made. In one exemplary embodiment, the heart rate variability index value is determined based on the relative power of the high frequencies versus the relative power of the low frequencies. In one exemplary embodiment, the pulse pressure is determined based on the difference between systolic pressure and diastolic pressure.

An apparatus for a heart assist device, comprising a processing unit for computing the blood flow rate from the arterial pressure curve and for predicting at every heartbeat the closing time of the heart valve from the curve of the blood flow rate. The processing unit is adapted to deliver a signal for controlling a heart assist device at a point in time, a period ahead in time of the closing time of the heart valve, wherein the mechanical properties of the said heart assist device are taken into account in determining the period. The apparatus adapts itself to changes in a patient's heart frequency and aortic pressure.

An ultrasonic liquefaction endodontic system having a graspable hand piece having a flow passageway therethrough. An ultrasonic energy generator is secured to the hand piece. A flexible injection tube is dimensioned for insertion into a tooth root canal. A source of flushing fluid under pulsed pressure is connected to the hand piece by which fluid pressure pulses having ultrasonic energy superimposed thereon are forced into a root canal.

An apparatus and method are disclosed for boring into teeth to remove decaying tool matter using a high pressure jet of water. A system according to the invention may include a pressurized water source operably connected to an applicator used to target the water stream at the decayed portion of the tooth. The invention contemplates water streams utilizing single or multiple stream orifices, pure water or particle-entrained streams, and constant high pressure or pulsing pressure to accomplish removal of oral material, including enamel.

A Chinese-medicinal pulse state sensor, a pulse state tester with closed-loop control for testing the pulse pressure, and its test method are disclosed. Said pulse state sensor has a probe and two or more strain beams with both ends fixed to the surface of said probe and the semiconductor strain foil to form two or more attached sensors.

Wrist-worn devices and related methods measure a pulse transit time non-invasively and calculate a blood pressure value using the pulse transit time. A wrist-worn device includes an accelerometer, a photo-plethysmogram (PPG) or a pulse pressure sensor, and a controller. The PPG or the pulse pressure sensor coupled to the wrist-worn device for detecting an arrival of a blood pressure pulse at the user's wrist. The controller is configured to process output signals from the accelerometer to detect when the blood pressure pulse is propagated from the left ventricle of the user's heart, process a signal from the PPG or the pulse pressure sensor to detect when the blood pressure pulse arrives at the wrist, calculate a pulse transit time (PTT) for propagation of the blood pressure pulse from the left ventricle to the wrist, and generate one or more blood pressure values for the user based on the PTT.

New systems and methods for remotely monitoring the activity, security, and health of an individual are provided. The monitoring system can be used to monitor both residence security and typical residential activity that is linked to the well being and health of an individual and can alert a third party when there is a digression from a predetermined set parameters. The monitoring system can incorporate a number of sensing elements including door opening and closing detection elements, passive infrared sensors, energy sensors for detecting the turning on and off of general household appliances, weighing scales, systolic blood pressure or pulse pressure measurement apparatus, bioelectrical impedance analysis measurement apparatus, breath analysis, and blood-based biological marker detection and quantification.

The present invention provides a method, system, and apparatus to monitor cardiovascular signals such as arterial blood pressure (ABP), pulse oximetry (POX), and intracranial pressure (ICP). The system can be used to calculate and monitor useful clinical information such as heart rate, respiratory rate, pulse pressure variation (PPV), harmonic phases, pulse morphology, and for artifact removal. The method uses a statistical state-space model of cardiovascular signals and a generalized Kalman filter (EKF) to simultaneously estimate and track the cardiovascular parameters of interest such as the cardiac fundamental frequency and higher harmonics, respiratory fundamental frequency and higher harmonics, cardiac component harmonic amplitudes and phases, respiratory component harmonic amplitudes and phases, and PPV.

The present invention provides an apparatus and methods for continuous intravascular measurement of whole blood concentration, blood pressure, and pulse pressure. The intravascular catheter incorporates a sensor to measure whole blood sound velocity, attenuation, backscatter amplitude, and blood flow velocity and also incorporates existing technologies for multiple physiologic measurements of whole blood. Pulse wave velocity and wave intensity are derived mathematically for purposes of estimating degree of local vascular tone.

Assemblies are provided comprising a stent and a sensor positioned on and/or in the stent. Within certain aspects the sensors are wireless sensors, and include for example one or more fluid pressure sensors, contact sensors, position sensors, accelerometers, pulse pressure sensors, blood volume sensors, blood flow sensors, blood chemistry sensors, blood metabolic sensors, mechanical stress sensors and/or temperature sensors. Within certain aspects these stents may be utilized to assist in stent placement, monitor stent function, identify complications of stent treatment, monitor physiologic parameters and/or medically image a body passageway, e.g., a vascular lumen.

A variable valve timing control system of an internal combustion engine includes a hydraulically-operated phase converter disposed between a sprocket and a camshaft, and having a phase-advance hydraulic chamber and a phase-retard hydraulic chamber for changing an angular phase of the camshaft relative to the sprocket. An electric pump is provided to supply working fluid selectively to one of the hydraulic chambers via a directional control valve. Also provided is a check valve disposed in a discharge line of the pump for permitting flow in a direction that the working fluid flows from the pump to the directional control valve and preventing any flow in the opposite direction, so as to prevent a pulse pressure arising from alternating torque exerted on the camshaft from being transmitted from either one of the hydraulic chambers via the discharge line to a discharge port of the pump.

The invention discloses a body feeling network-based sleeveless driven pulse pressure measurement and automatic calibration device. The device comprises a body feeling network node for acquiring a heart pulsation related signal from the body surface of a user, a body feeling network node for measuring a transmission distance between the heart and a heart pulsation related signal acquisition point, a body feeling network node for measuring angle change of the heart pulsation related signal acquisition point relative to the position of the heart, and a control and calculation central pivot. The body feeling network nodes of the device are distributed on the body surface of the user, so the device is simple and convenient to mount, has no injury to the human body and does not need to inflate sleeve straps in the calibration and measurement processes; the device realizes the communication between the nodes and the control and calculation central pivot in a wireless mode, is convenient to carry, does not affect the daily life and can be continuously used for long time; and simultaneously, the device extracts multiple physiological parameters aiming at different individuals and different physiological states to automatically finish calibration, and has high estimation accuracy of blood pressure, comprehensive monitoring and broad application range.

A pulse diagnostic instrument of the present invention comprises a plurality of probes connected together and aligned laterally in series, with each probe configured for contacting a skin surface of a body limb adjacent an arterial vessel. Each probe includes a pressure sensor configured for sensing a pulse pressure of the arterial vessel and an electrically-driven pressure applicator, mounted to the pressure sensor, and configured for applying an external force through the pressure sensor to apply pressure against the arterial vessel through the skin surface during sensing of the pulse pressure.

The self-cleaning air filter uses reverse pulse self-cleaning for small scale, small volume air filtration applications, such as vehicles and motorized equipment. The self-cleaning air filter includes a filter casing, a filter element housed within a filter casing, an electronically controlled pulse valve that releases the compressed air pulse, and a pulse pressure relief vent. During the cleaning cycle, the pulse pressure vent opens to vent the compressed air pulse to the atmosphere thereby maintaining the positive pressure differential between the inside and outside of the filter element, which sustains the cleaning action for the duration of the compressed air pulse.

The invention discloses a COSGO (Average Order Statistics Greatest of)-CFAR (Constant False Alarm Rate) detection method in the work adopting a continuous wave system radar. In the COSGO-CFAR detection, firstly, n reference units in a left reference window and a right reference window of a target detection unit are sequenced from small to large according to powder; the left reference window and the right reference window respectively selects powers of former n-k units as clutter average power to respectively obtain two average clutter powders of the left reference window and the right reference window; the greater power of the two obtained average clutter powders is selected as the clutter power; and then the greater power is multiplied with a normalization threshold to obtain a real detection threshold, and the real detection threshold is compared with the power of the target detection unit to obtain a comparison result. The COSGO-CFAR detection method provided in the working adopting the continuous wave system radar realizes two-dimensional coherence accumulation through distance IFFT (Inverse Fast Fourier Transform) pulse pressure and orientation FFT (Fast Flourier Transform) pulse pressure, improves the target signal to noise ratio gain, and reduces the clutter detection omission under multi-object detection.

The invention relates to a device for realizing 3D metal printing by virtue of a supporting structure. The device comprises a translation stage capable of moving along the X-axis, the Y-axis and the Z-axis. Heating resistance wires and a thermocouple are arranged on a base plate of the translation stage. The heating resistance wires are used for preheating the base plate, so as to enable metal droplet layers to be tightly overlapped. The thermocouple is used for realizing the measurement and the feedback control of a temperature. An electromagnetic induction heating copper pipe and a cooling water pipe are arranged outside a graphite crucible, metallic raw materials are enabled to be molten to form molten metal, the bottom of the graphite crucible is connected with a metal printing spray nozzle, a protective gas is inputted from a gas inlet pipe at the top of the graphite crucible, and under the pulse pressure, molten metal forms regular metal droplets to drip to the base plate of the translation stage. The 3D metal droplet printing is realized through the cooperation with the movement of the translation stage. A supporting material spray nozzle is adjacent to the metal printing spray nozzle. A uniform mixture of gypsum and photosensitive resin is extruded stably under the constant pressure inputted by the gas inlet pipe so as to print the supporting part of a part. The switching between metal and the supporting material is automatically recognized and controlled by a control system. The 3D metal printing device is reasonable, high in operability, high in degree of automation, high in production efficiency, and suitable for being widely popularized, and ensures the molding quality.