85 results about "Venous Pressures" patented technology

The invention discloses a physiological index detector. The physiological index detector comprises a microprocessor, a fingerprint identification sensor, a heart rate acquisition sensor, an arterial pressure sensor, a venous pressure sensor, a noninvasive blood glucose detection device, a temperature sensor, a wireless communication module, a GPRS short message communication device, a display screen and a warning device. The physiological index detector is a wristband-type structure fit to the wrist curve of the human body, components in the circuit portion are installed by using a flexible printed circuit (FPC), the FPC is mounted in the wristband-type physiological index detector in a circular arc shape, the display screen is an organic light emitting diode (OLED) which is arranged along the outer side of the wristband-type physiological index detector in an arc-shaped curve shape, and the wireless communication module transmits the acquired physiological index data of the human body to a cloud server for editing, preserving and processing. The physiological index detector is convenient to carry and measure and data are uploaded to the cloud, so that the physiological index data can be preserved for a long time, analyzed, tracked and warned.

Systems and methods are provided for monitoring changes in blood volume using waveforms in the peripheral vasculature. In particular, the systems and methods relate to detecting ventilation-induced variation (VIV) of waveforms in the peripheral vasculature. Advantageously, the systems and methods may relate to analyzing VIV in peripheral venous pressure (PVP). Thus, the VIV of PVP may be measured, wherein decreased VIV is indicative of decreased blood volume In exemplary embodiments, such as involving spontaneous breathing, it may be necessary to account for changes in respiratory signal strength. Thus systems and methods are also provided for assessing coherence between ventilation and VIV for a flow or pressure waveform. Specifically, coherence is evaluated by comparing the waveform to a detected respiratory signal. Finally, systems and method are provided for distinguishing the impact of respiration on the PG signal during hypervolemia as compared to hypovolemia. Such systems and methods may advantageously be utilized to monitor fluid status during fluid replacement.

The devices and methods generally relate to vibratable sensors for measuring ambient fluid pressure, in particular implantable sensors. The devices and methods are particularly well-suited to implantation within the body of a living animal or human to monitor physiological conditions, such as portal and/or hepatic venous blood pressure, and allow frequent, remote interrogation of venous pressure using the resonance frequency of an implanted sensor. The sensor devices are relatively small compared to conventional devices for measuring fluid pressure and can be implanted in the porto-hepatic venous system, whereas conventional devices are too large. The small size of the device is accomplished by using a thick sensor membrane, compared to conventional devices, and by limiting the size of additional elements of the device relative to the size of the sensor membrane. The thicker sensor member also obviates the need for multiple sensor arrays and maintains the accuracy and robustness of the sensor device. A data capture, processing, and display system provides a pressure measurement reading, and is particularly well-suited for detecting portal hypertension in patients with liver disorders.

The present invention relates to the implantation of one or more prosthetic valve(s) in the pulmonary vein(s) of a subject as a means of decreasing or preventing an increase in pulmonary venous pressure. The present invention accordingly provides for novel treatment strategies for the treatment of medical disorders associated with elevated pulmonary venous pressure, including congestive heart failure, as well as for prosthetic pulmonary vein valves and their delivery systems. Expandable as well as fixed-dimension non-expandable pulmonary vein prosthetic valves for implantation by a variety of surgical and percutaneous procedures are also described.

Aspects of the invention relates to systems and methods for hypovolemia and/or hypervolemia detection of a living subject using peripheral intravenous waveform analysis. In one embodiment, the method includes: acquiring, from a vein of the living subject, peripheral venous signals; performing a spectral analysis on the acquired peripheral venous signals to obtain a peripheral venous pressure frequency spectrum; and performing a statistical analysis on amplitudes of peaks of the peripheral venous pressure frequency spectrum to determine the blood volume status of the living subject in real time. Specifically, at least two peaks, respectively corresponding to a first frequency and a second frequency, are obtained on the peripheral venous pressure frequency spectrum. Amplitude change of the second peak is used to determine the blood volume status of the living subject. Hemorrhage may be detected when a significant amplitude decrease is detected from the second baseline peak to the second peak.

In one aspect, an apparatus for measuring peripheral venous pressure includes a tubing having two ends with one end connectable to a fluid source and the other end connectable to a vein, a fluid controlling device configured to have an on position and an off position, and at least one pressure sensor configured to measure fluid pressures therein. When the fluid controlling device is in the on position, fluid flow in the tubing is allowed to pass through the fluid controlling device, such that the at least one pressure sensor measures both a fluid pressure from the fluid source and a distal venous pressure from the vein. When the fluid controlling device is in the off position, no fluid flow in the tubing is allowed to pass through the fluid controlling device, such that the at least one pressure sensor measures the distal venous pressure from the vein only.

Non-invasively measuring a physiological parameter by applying to a subject's body part a venous occlusion plethysmographic device including a first section having a first fluid chamber and at least a second region having a second fluid chamber to engage a first region of the body part and a second region of the body part, proximal of the first region; pressurizing the first chamber to a pressure sufficient to compensate for hydrostatic pressure added to the inherent venous pressure at the maximal vertical lowering level of the body part relative to the subject's heart level; intermittently raising and lowering the pressure in the second fluid chamber to a pressure above or equal to the pressure in the first chamber, but below the arterial blood pressure; measuring changes in volume of the first region of the body part; and utilizing the measured volume changes to provide a measure of the physiological parameter.

Apparatus for processing blood in an extracorporeal circuit with automatic flow control is provided in which error conditions are sensed and system operation is modulated responsive to the error conditions. The apparatus includes an extracorporeal blood processing system, at least one sensor that senses the presence or absence of gas or monitors venous pressure, and a controller operably coupled to the blood processing system to selectively reduce pump speed or to reconfigure flow paths within the blood processing system responsive to the sensor output.

The invention provides a construction method of a radiology-based hepatic venous pressure gradient (rHVPG) calculation model. An advantageous hepatic vein pressure gradient calculation model can be constructed on this basis, and a new approach is provided to calculate the early noninvasive indexes of patients with portal hypertension. The invention also provides a rHVPG calculation system. The method can overcome many limitations of an existing noninvasive measurement method. The rHVPG calculation system is feasible, and is expected to provide a new idea for the noninvasive measurement of portal pressure, and plays an active role in improving the quality of life of patients with portal hypertension and reducing the burden of disease in families and society.

The invention provides a radiomics-based hepatic venous pressure gradient (rHVPG) calculation model construction method, on this basis, a more advantageous hepatic venous pressure gradient calculation model can be constructed, and a new way is provided for the calculation of the early stage non-invasive index of a patient with portal hypertension. The invention also provides a radiomics-based hepatic venous pressure gradient calculation system. The invention overcomes the many limitations of current non-invasive measurement methods. The rHVPG calculation system proposed by the invention is feasible, is expected to provide a new idea for noninvasive measurement of portal pressure, and plays a positive role in improving the quality of life of the patient with portal hypertension and alleviating the disease burden of families and society.

The invention discloses an anti-blood return medical infusion set and belongs to the technical field of medical instruments. The anti-blood return medical infusion set comprises a cork puncture unit, a Murphy's pipe, an intravenous infusion needle and an infusion tube; a liquid-stopping device is arranged at the infusion pipeline between the cork puncture unit and the intravenous infusion needle; the anti-blood return medical infusion unit also comprises a volume reduction anti-blood return hose with elasticity lower than the infusion tube; two ends of the volume reduction anti-blood return hose are connected with the infusion tube between the liquid-stopping device and the intravenous infusion needle; when the anti-blood return medical infusion unit is used for infusion, the vertical distance between the lower end part of the volume reduction anti-blood return hose and the port of the intravenous infusion needle is not smaller than the height of a medical cylinder corresponding to the human body venous pressure. The anti-blood return medical infusion set is simple in structure, excellent in anti-blood return effect, and capable of changing the anti-blood return time of the anti-blood return medical infusion set by changing the hardness and/or the length of the volume reduction anti-blood return hose.

A remaining needle comprises a remaining hose, a remaining needle seat, an extension hose seat, an extension hose connected between the remaining needle seat and the extension hose seat and a liquid stopping clamp arranged on the extension hose. The front portions of an upper contact and a lower contact located on a pressing touch portion of the liquid stopping clamp between a clamp piece and a clamp seat of the liquid stopping clamp are provided with at least one elastic compression device which has elasticity and larger clamping area and can form continuous positive pressure on the extension hose. According to the remaining needle, due to the fact that the liquid stopping clamp structure with at least two clamping positions is adopted, not only can the clamp piece of the liquid stopping clamp reliably clamp the extension hose to form liquid stopping, but also the continuous positive pressure compression device is utilized to continuously extrude the extension hose at the remaining needle seat end in a large area to enable the extension hose to generate larger deformation, liquid in an extruding pipe enters the remaining hose to play a continuous positive pressure action, therefore, blood return caused by springback siphon of the extension hose due to the liquid stopping clamp can be effectively avoided, the blood can be effectively prevented from flowing back to the remaining hose due to venous pressure fluctuation in blood vessels, and the purpose of preventing thrombus can be achieved.

The present invention discloses a non-invasive esophageal varicose vein pressure measuring instrument. It includes PC machine, communication circuit, microcontroller, drive circuit, air pump, first pressure sensor, second pressure sensor, A/D converter, air tank and probe. Besides, said invention also provides the connection mode of all the said components.

A computer visualized method for measuring the pressure of esophageal varicovein includes such steps as introducing an air bag into esophagus by use of electronic gastroscope, recording the deformations of said air bag by a camera head on the front end of electronic gastroscope, transmitting them to computer for tracking the deformation while synchronously transmitting internal pressure change of air bag to the computer, analyzing the relation between the pressure of air bag and the dynamic image of esophageal varicovein pressure amplitude, and measuring the pressure of air bag, which is just the pressure of esophageal varicovein when the pressure amplitude change of esophageal varicovein is relatively stable. Its system is also disclosed.

A method and equipment for measuring venous pressure without wound is disclosed. Said equipment is composed of air channel including air pump, air sensitive probe consisting of guide tube and capillary tube, circuit unit consisting of amplifier and A/D converter, and data processing unit consisting of computer and display. Said method features that the venous pressure is sensed by air sensitive probe and then transmitted via sensor to amplifier, A/D converter and computer sequentially. The result is displayed in waveform and numerals modes. Its advantages are simple method and high correctness.

A low cost, transportable system for monitoring the central venous pressure of a patient receiving an infusion is provided. The pressure monitoring system of the present invention employs a pump and a flow meter in order to supply infusion fluids to a patient. Based upon the control factors and changes thereof communicated to the pump by a controller in order to achieve and maintain a desired infusion fluid flow rate, relative changes in patient's venous pressure and/or quantitative pressure data is obtained.