93 results about "Venous pressure" patented technology

A method of protecting an upper body and a lower body of a patient from high venous pressures comprising implanting a first stented valve at the superior vena cava and a second stented valve at the inferior vena cava, wherein the first and second valves are configured to permit blood flow towards a right atrium of the patient and prevent blood flow in an opposite direction.

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.

A method of detecting the detachment of the venous needle from a patient during an extracorporeal blood treatment in a dialysis machine having an extracorporeal blood circuit provided with an arterial branch and a venous branch. The arterial pressure (Pa) is measured in the arterial branch and the venous pressure (Pv) is measured in the venous branch, and the determination is made of whether or not decreases of the arterial pressures (Pa) and venous pressures (Pv) are occurring during the dialysis treatment in normal conditions.

The invention relates to a portable blood purifying system, which comprises a high throughput dialyzer with an arterial duct, a venous duct, a washing liquid tube and a transfusion tube; the arterial duct is in turn connected in series with an arterial valve, an arterial pressure sensor and a blood pump; the venous duct is in turn connected in series with a venous valve, a venous temperature sensor, a venous bubble detector and a venous pressure sensor, so that an external circulation unit is formed; the washing liquid tube is connected in series with a pre-charging valve and is communicated with a washing liquid container; the transfusion tube is in turn connected in series with a temperature controller, a transfusion tube bubble collector and a transfusion pump, and is communicated with a waste liquid container, so that a waste liquid processing unit is formed; and the system also comprises a transfusion pump, a temperature control device, a transfusion tube, a gating valve and a first transfusion branch and a second transfusion tube branch, so that a transfusion unit is formed. The system is simplified in structure and convenient to carry; and the system is suitable for patients to do short-time dialysis for several times or night dialysis treatment at home as household treatment equipment, so that toxin tolerance of dialysis patients during dialysis period is relieved while medical cost is reduced.

Novel devices which can be used to both collect blood samples from and administer medical fluids to a patient on a repeated and continual basis using one rather than multiple needle insertions. The devices are capable of removing blood from one of the patient's veins using the intrinsic venous pressure of the blood and capillary action of the device, thereby preventing vacuum-induced collapse of the vein. The device typically includes a main tubing segment confluently connected to a cannula for insertion in the patient's vein. A syringe port and a volumeter for collecting blood branch separately from the main tubing segment. The device is used to collect blood by attaching an empty blood collection syringe to the syringe port, inserting the cannula in the patient's vein, allowing passive flow of blood from the main tubing segment into the volumeter under intrinsic venous blood pressure and capillary action, and then facilitating active flow of blood from the volumeter into the blood collection syringe by extending the syringe plunger. The blood-filled syringe may be replaced by additional empty blood collection syringes and the procedure repeated, as needed, depending on the quantity of blood to be obtained. The device may be used to administer medical fluids to the patient by first removing the residual blood from the main tubing segment and volumeter, flushing the main tubing segment with sterile normal saline and administering the fluids to the patient through the main tubing segment from a medical fluid syringe or catheter attached to the syringe port.

Provided is a hemodialyzer for preventing beforehand any medical accident such as air inclusion or blood loss during a medical treatment by detecting even a minute connection failure, if any. The hemodialyzer includes a hemodialyzer (D), a dialysate supply line (L1), a dialysate discharge line (L2), an artery side blood line (L3), a vein side blood line (L4), first fluid feeding means (P1), second fluid feeding means (P2), third fluid feeding means (P3), a blood pump (P4), a vein side chamber (C_V), an overflow line (L5), a venous pressure monitor line (L6), dialysate pressure measuring means (M_T), venous pressure measuring means (M_V), clamps (CL_L4, CL_L5), control means (G1) that closes the clamp (CL_L5) when a predetermined given period of time has elapsed from the start of priming, and operates the third fluid feeding means (P3) in a reverse filtration direction or in a fluid removal direction, and then opens the clamp (CL_L5) when a predetermined given period of time has elapsed, and judging means (J1) that compares a pressure variation amount in the dialysate pressure or the venous pressure for a period of time when the clamp (CL_L5) is closed with a predetermined reference value to judge normality of a circuit connection.

The invention provides a blood return prevention infusion connector which comprises an outer connector, an inner connecting seat and an elastic barrier piece. The outer connector is hermetically connected with the inner connecting seat, the elastic barrier piece is arranged between a liquid inlet of outer connector and a liquid outlet of the inner connecting seat, the periphery of the elastic barrier piece is connected with the inner wall of the liquid inlet, the elastic barrier piece is provided with a closed portion and a liquid though port, and the closed portion covers a liquid outlet of the inner connecting seat. By the aid of the blood return prevention infusion connector, the elastic barrier piece is fixed for the first time, one-way flow of liquid medicine is realized by only depending on deformation of the elastic barrier piece, the blood return can be prevented by the infusion connector even if liquid pressure is equal to human venous pressure or the pressure difference between the liquid pressure and the human venous pressure are smaller, the connector effectively solves the problem that a blood return prevention infusion connector cannot really function in preventing blood return in prior art, so that blood return is avoided even if an infusion person optionally walks or lifts an arm in the infusion process, and clinical application is more facilitated.

A nerve cuff stimulation electrode for cervical VNS is provided and configured to be arranged so as to at least partially surround or enclose one of the vagus nerves. The cuff stimulation electrode has at least two contacts configured to deliver electric stimulation pulses to a vagus nerve. The cuff stimulation electrode further has or may be attached or connected to a tilt sensor, a kinematic sensor, and/or a pulsation sensor configured to generate a signal representative of arterial and venous pressures. The implantable tilt sensor is configured to output a posture signal indicating a patient's posture, thus allowing discrimination between supine and semi-recumbent or erect postures.

A venous-arterial detector is disclosed. The detector includes a first chamber in fluid communication with a needle, and an indicator chamber in selective fluid communication with the first chamber through a valve. The indicator chamber is pre-pressurized to a defined pressure that preferably exceeds typical venous pressure, and the valve retains that pressure within the indicator chamber. When the needle is inserted into a vessel, if the pressure in the vessel is greater than the defined pressure in the indicator chamber, blood will flow into the indicator chamber, indicating that the vessel is most likely to be an artery.

The present invention is directed to an apparatus for metering the jugular venous pressure of a patient, and a method thereof. The apparatus comprises: a slider which comprises a scale for indicating the venous pressure of a patient; a pointer connected to the sliding member of the slider perpendicularly to the scale, for pointing on the filling level of the jugular venous pressure of the patient. The jugular venous pressure is indicated by positioning the patient at a certain angle, such as 30 to 45 degrees with reference to the floor, placing the tip at the sternal-angle of the patient while the slider is held vertically, sliding the pointer until pointing on the top of the filling level of the jugular vein of the patient.

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 blood purification device capable of precisely detecting blockages of an arterial blood circuit in an arterial blood return step. A controlling means (19) detects pressure with a venous pressure sensor (21) while also carrying out a plurality of iterations of arterial blood return steps comprising a pressure accumulation step for forward-driving a blood pump (4) while also closing off a flow path with an electromagnetic valve (V2) to accumulate pressure between the installation position of the blood pump (4) and the installation position of the electromagnetic valve (V2), and a pressure release step for reverse-driving the blood pump (4) while also maintaining the closing off of the flow path by the electromagnetic valve (V2) to return blood from the distal end of an arterial blood circuit (2); and blockages of the flow path in an arterial blood circuit (1) can be detected on the basis of the change in pressure at corresponding predetermined points in time in each of the arterial blood return steps.

The embodiment of the invention relates to a hepatic venous pressure gradient classification method of a CT image as well as computer equipment. The method comprises the following steps: performing liver image cutting pretreatment on the acquired abdomen CT image of a tester to acquire a plurality of to-be-detected liver image blocks; input the plurality of to-be-detected liver image blocks into aliver predicting submodel which is trained in advance to perform hepatic venous pressure gradient classification test to acquire a plurality of predicting classification of each to-be-detected liverimage block as well as predicting classification probability corresponding to the classification, wherein the hepatic venous pressure gradient of the tester is the same predicting classification within the same preset hepatic venous pressure gradient range; and calculating the average value of the classification probability belonging to the same predicting classification, and determining the maximum value of each average value and the predicting classification corresponding to the maximum value as the hepatic venous pressure gradient classification test result of the tester. According to eachembodiment of the invention, multi-classification noninvasive test of the hepatic venous pressure gradient is realized, the test classification result is high in precision and the generalization ability is higher.

A remaining needle with an elastic contact comprises a remaining soft pipe, a remaining needle base, an extending pipe base, an extending soft pipe connected between the remaining needle base and the extending pipe base and a liquid stopping clamp arranged on the extending soft pipe. The remaining needle is characterized in that at least one of an upper contact and a lower contact of a pressing-contacting part of the liquid stopping clamp is an elastic contact which can form continuous positive pressure on the extending soft pipe with different liquid stopping clamp hard bodies. The liquid stopping clamp structure with the elastic contact is used, the elastic pressure between the upper contact and the lower contact is larger than human body venous pressure, blood back flowing is effectively prevented, the extending pipe is clamped, and the problem that liquid at the back end enters the remaining soft pipe is avoided. When large external force is applied to the back end of the extending pipe and the external force is larger than the pressure between the elastic contacts of the liquid stopping clamp, the elastic contacts can be slightly stretched so that high-pressure liquid in the back portion of a cavity of the extending pipe can pass, positive pressure is formed in the remaining soft pipe and a front cavity of the extending pipe, and blood flowing back into the remaining soft pipe is forced to flow back to into a blood vessel.

A respiratory monitoring apparatus (10) includes a central venous pressure sensor (24) configured to measure a central venous pressure (CVP) signal of a patient. At least one processor (32, 34, 36, 38, 40, 42, 44, 58) is programmed to process the CVP signal to generate respiratory information for the patient by operations including: segmenting the CVP signal based on detected breath intervals; calculating a surrogate muscle pressure signal from the segmented CVP signal; and filtering the surrogate muscle pressure signal to remove a cardiac activity component a cardiac activity component of the surrogate respiratory muscle pressure signal.

The present disclosure relates to the field of early non-invasive diagnosis, and specifically, to a method of determining a virtual hepatic venous pressure gradient. The method includes: constructing a 3-dimensional (3D) hepatic vein-portal vein model; establishing a finite element division mathematical model; and applying fluid dynamics to compute and simulate a virtual hepatic venous pressure gradient (vHVPG). The method optimizes and improves a more complete 3D hepatic vein-portal vein model, finite element division, and fluid dynamic simulation computation, constructing and validating a new vHVPG determination technology providing better diagnosis, providing a safe, non-invasive, accurate, and quantitative method for early non-invasive diagnosis of a portal vein high pressure patient.

The invention relates to a novel vein needle with a quick, sensitive and visible blood returning function. The novel vein needle comprises a needle base, a needle base handle, a needle body, a needle body protective cover and an elastic connecting hose. The novel vein needle is characterized in that the elastic connecting hose and the needle base are made of transparent materials; and the cross section of the elastic connecting hose is elliptical. The novel vein needle further comprises a steel safe sleeve, a sleeve base, a sleeve base handle, a self-locking elastic piece connected to the rear end of the sleeve base and a limiting tooth arranged on the inner side face at the rear end of the self-locking elastic piece. The elastic connecting hose is an elliptical hose, and compared with a circular hose, the deformation of the elliptical hose is remarkably greater than that of the circular hose under a same venous pressure, so that the quick capacity-increasing pressure of the connecting hose is reduced to form a larger pressure difference, so as to increase the flowing speed of venous blood to the connecting hose and prolong the visible flowing length of venous blood, therefore, quick, sensitive and visible blood return is realized. In addition, the novel vein needle further has the blood vessel puncture preventing function, the seep preventing function, the separation preventing function and the function of preventing accidental injury caused by the rear part of the needle.