14 results about "Flow limitation" patented technology

System and method for deploying a flow restriction device in patient vascular and recapturing and repositioning the flow device after full or partial deployment. Disclosed systems and methods permit confirmation of device placement, such as by measuring a pressure drop across the partially or fully deployed device in the coronary sinus before release of the device and permanent implantation.

An apparatus for controlling a flow rate of a gas is disclosed herein, including a flow restriction element configured to restrict a flow rate of a gas; a pressure regulator coupled to an inlet of the flow restriction element, wherein the pressure regulator is configured to control a pressure of the gas between the pressure regulator and the flow restriction element; a flow meter coupled to an outlet of the flow restriction element, wherein the flow meter is configured to measure the flow rate of the gas at the outlet of the flow restriction element; and a controller operatively coupled to the pressure regulator and the flow meter, wherein the controller receives the flow rate measurement of the flow meter, determines a pressure setting associated with a target flow rate, and causes the pressure regulator to have the pressure setting.

This application discloses various systems, devices, components, and methods for controllably and selectively occluding, restricting, and / or shunting blood flow within a patient's vascular system. The flow restriction system may include an implant with a flow restrictor and an implantable controller with an actuator for actuating the flow restrictor. The implant may be separable from its respective controller and actuator. The implant may include a dual-frame configuration to prevent tissue growth into at least one frame.

A hemodialysis device including a replacement fluid passage between a dialysate circuit and a blood circuit, the dialysate circuit and the replacement fluid passage being respectively provided with first and second flow rate restriction devices. Also provided is a connection portion pressure sensor for measuring a pressure of a connection portion between a dialysate supply passage and the replacement fluid passage, and a vein-side pressure sensor for measuring a pressure of the blood circuit. A control device adjusts an opening degree of the second flow rate restriction device multiple times based on the measured pressure of the connection portion pressure sensor, and the measured pressure of the vein-side pressure sensor, for one round, being from when a supply compartment of a chamber provided to the dialysate circuit is filled with a fresh dialysate until all of the fresh dialysate in the supply compartment has been discharged.

A present ventilator system for detecting and treating concurrent chronic obstructive pulmonary disease (COPD) and overlap syndrome of obstructive sleep apnea (OSA events) includes a pressure generator for generating a pressurized flow of breathable gas for delivery to an airway of a subject, a sensor(s) for generating an output signal conveying information related to a parameter of the breathable gas, and a processor(s) operably connected to the sensor(s) and the pressure generator, configured to detect the presence of an OSA event and / or expiratory flow limitation (EFL) in the subject based on the output signal. In response to detecting the concurrent presence of an OSA event and EFL, the processor is configured to determine an OSA event therapy parameter for treating the detected OSA event in the subject, determine an EFL therapy parameter for treating the detected EFL in the subject, determine a priority treatment based on a comparison between the OSA event therapy parameter and the EFL therapy parameter, and control the pressure generator to deliver the determined priority treatment.

Mass flow controllers and associated methods are provided. A mass flow controller includes a control valve configured to control flow of a fluid in a flow path and first and second flow sensors. The second flow sensor includes a pressure sensor adjacent a flow restrictor disposed in the flow path. A controller is configured to control actuation of the control valve. The controller is configured to determine a first mass flow rate based on one or more first fluid flow parameters detected by the first flow sensor, determine a second mass flow rate based on one or more second fluid flow parameters detected by the second flow sensor, calculate an orifice area of the flow restrictor based on the determined first mass flow rate, and compare a nominal orifice area of the flow restrictor with the calculated orifice area to assess a condition of the second flow sensor.

A negative pressure wound treatment apparatus can include a negative pressure source configured to be connected to a wound by a fluid flow path, a valve in the fluid flow path and configured to allow supply of negative pressure from the negative pressure source upstream of the valve in an open state and to block supply of negative pressure from the negative pressure source upstream of the valve in a closed state, a flow restrictor in the fluid flow path, and a pressure sensor configured to measure a pressure differential across the flow restrictor. The apparatus can include a control circuit configured to cause the valve to be in the open state in a normal operating mode and to perform at least one of a leak test, a flow test, or an overpressure test in a test mode.

A method for providing therapeutic treatment to reduce pre-load may be provided. The method may include placing a ventricular assist device (VAD) at least partially within a left ventricle or a right ventricle of a patient, and placing a catheter-based device including an adjustable flow limiting element (FRE) such that the FRE is disposed within a superior vena cava (SVC) of the patient. The method may include receiving information from the VAD and / or conduit-based FRE device, determining a first determination value based on the information, and controlling at least one performance parameter of the VAD and / or conduit-based device based on the first determination value.

Provided is a leadless flow restriction system, which comprises an intravascular housing, a control unit and a flow restrictor assembly. An actuator configured to rotate a first shaft and a driving element connected with one end of the first shaft are encapsulated in the intravascular housing. The control unit is arranged in the intravascular housing or connected with the intravascular housing and the actuator. The flow restrictor assembly comprises an inflatable body, a flow restrictor and a transmission shaft assembly. In use, the activation of the actuator causes the transmission shaft in the transmission shaft assembly to rotate or move linearly, so that the flow restrictor adjustably blocks the inner cavity.

A device for regulating pressure, the device comprising: a body having: an inlet; the inner cavity is communicated with the inlet; and one or more flow features including a flow restrictor for restricting airflow through the lumen wherein downstream of the flow restrictor is a protective portion that helps protect the restrictor from damage.

Mass flow controllers and associated methods are provided. A mass flow controller includes a control valve configured to control flow of a fluid in a flow path and first and second flow sensors. The second flow sensor includes a pressure sensor adjacent a flow restrictor disposed in the flow path. A controller is configured to control actuation of the control valve. The controller is configured to determine a first mass flow rate based on one or more first fluid flow parameters detected by the first flow sensor, determine a second mass flow rate based on one or more second fluid flow parameters detected by the second flow sensor, calculate an orifice area of the flow restrictor based on the determined first mass flow rate, and compare a nominal orifice area of the flow restrictor with the calculated orifice area to assess a condition of the second flow sensor.

In the present invention, hemodialysis is continued even if a flow restricting means is blocked.　The present invention relates to a hemodialysis device (1) in which a first flow rate restricting means (MV1) is provided in a dialysate supply passage (14), a second flow rate restricting means (MV2) is provided in a replacement fluid passage (5), and first and second dialysate filters (21, 22) are provided in the dialysate supply passage (14).　Provided is a bypass passage (second flushing passage (24), bypass passage (32)) that communicates the branching position between the first dialysate filter (21) and the replacement fluid passage (5) in the dialysate supply passage (14) with the first flow rate restricting means (MV1) and a dialyzer (2), and a bypass on-off valve (tenth on-off valve (V10), supply fluid connection valve (V14)) that opens and closes the bypass passage, and if an abnormality occurs in either the first flow rate restricting means (MV1) or the second flow rate restricting means (MV2), the bypass on-off valve is opened to supply dialysate to the dialyzer (2) through the bypass passage.

A flow restrictor includes a flexible tube held in a housing and a linear actuator connected through an intermediate link to a distal link via a first revolute joint proximate the linear actuator and a second revolute joint connecting the intermediate and distal links. The distal link has a distal end adjacent the flexible tube and the intermediate and distal links are constrained to move such that when the linear actuator moves the first revolute joint toward the linear actuator, the distal end of the distal link is driven into the side of the tube thereby progressively occluding the flexible tube.

A method of restricting fluid flow through a pipe. The method comprising installing an anchor through an opening in a wall of the pipe, engaging a portion of the wall with a foot of an anchor, securing a head of the anchor to the pipe, placing a saddle between a bottom surface of the head and an outer surface of the wall of the pipe, and inflating an inflatable plug coupled to the anchor. When securing the head of the anchor to the pipe, the head remains partially outside the pipe.