Devices and methods for controlling molecular transport are disclosed herein. The devices include a membrane having a plurality of nanochannels extending therethrough. The membrane has an inner electrically conductive layer and an outer dielectric layer. The outer dielectric layer creates an insulative barrier between the electrically conductive layer and the contents of the nanochannels. At least one electrical contact region is positioned on a surface of the membrane. The electrical contact region exposes the electrically conductive layer of the membrane for electrical coupling to external electronics. When the membrane is at a first voltage, molecules flow through the nanochannels at a first release rate. When the membrane is at a second voltage, charge accumulation within the nanochannels modulates the flow of molecules through the nanochannels to a second release rate that is different than the first release rate. Methods of fabricating devices for controlling molecular transport are also disclosed herein.

An infusion system and method configured to identify a break in static friction between a plunger and an infusate cartridge during an infusion of infusate for the purpose of providing a more consistent flow of infusate and promoting a more efficient use of energy. The infusion system and method can include monitoring of force between a drive mechanism and the plunger for a decrease in a rate of the force over time during actuation of the drive mechanism, thereby indicating a break in static friction between the plunger and the cartridge, and determining a low power consumption sleep duration based on an advancement of the actuator following the break in static friction.

A sensor for measuring the contents of a syringe or other container is described. The sensor includes a voltage source, a pair of electrodes, a measurement circuit, and an electrode shield. The voltage source is coupled to the electrodes, and the electrodes apply an electric field through at least a portion of the container or syringe. The measurement circuit measures capacitance across the electrodes. The electrode shield partially encloses the pair of electrodes. The electrode shield may include an inner electrode shield having a second voltage, and an outer electrode shield having a third voltage.

A sensor for measuring the contents of a syringe or other container is described. The sensor includes a voltage source, a pair of electrodes, a measurement circuit, and an electrode shield. The voltage source is coupled to the electrodes, and the electrodes apply an electric field through at least a portion of the container or syringe. The measurement circuit measures capacitance across the electrodes. The electrode shield partially encloses the pair of electrodes. The electrode shield may include an inner electrode shield having a second voltage, and an outer electrode shield having a third voltage.

A clamp includes a fixed portion on which a medical tube is placed, a movable portion that is provided above the fixed portion to face the fixed portion, and a closing portion that presses and closes the medical tube when the movable portion is pressed toward the fixed portion. The closing portion includes a presser that protrudes from the movable portion toward the fixed portion and presses the medical tube, a pair of sidewalls that extends, like a wall, from both sides of the fixed portion and prevents the medical tube from being shifted laterally, and a guide structure that allows the presser to be guided between the sidewalls.

The present disclosure provides a new and innovative method and system for flow rate compensation in devices, such as infusion pumps. In various embodiments, a computer-implemented method includes determining a location of a plurality of infusion pumps in a pump stack including the plurality of infusion pumps and a fluid supply connected to each of the plurality of infusion pumps. The computer-implemented method also includes determining a reference infusion pump, in the plurality of infusion pumps, and adjusting the flow rate for each infusion pump in the plurality of infusion pumps based on the distance between the infusion pump and the reference infusion pump.

Check valves are described herein. A check valve includes an inlet body, an outlet body, a valve body, a valve member, and a wiping extension. The inlet body defines an inlet portion. The outlet body defines an outlet portion. The valve body is coupled between the inlet bod and the outlet body. The valve body defines a valve cavity. The valve cavity is in fluid communication with the inlet portion and the outlet portion. The valve member is disposed within the valve cavity. The valve member is configured to permit flow from the inlet portion to the outlet portion and prevent flow from the outlet portion to the inlet portion. The wiping extension extends from the valve body toward the valve member. The wiping extension is movable relative to the valve member to dislodge particulate from the valve member.

A wearable infusion pump assembly. The wearable infusion pump assembly includes a reservoir for receiving an infusible fluid and a fluid delivery system configured to deliver the infusible fluid from the reservoir to an external infusion set. The fluid delivery system includes a controller, a pump assembly for extracting a quantity of infusible fluid from the reservoir and providing the quantity of infusible fluid to the external infusion set, the pump assembly comprising a pump plunger, the pump plunger having distance of travel, the distance of travel having a starting position and an ending position, at least one optical sensor assembly for sensing the starting position and ending position of the pump plunger distance of travel and sending sensor output to the controller, and a first valve assembly configured to selectively isolate the pump assembly from the reservoir, wherein the controller receives the sensor output and determines the total displacement of the pump plunger.

A surgical fluid management system includes a console and a cassette for delivering fluids to a surgical site. The console has a pump rotor and a pressure-sensing membrane. The cassette has a cassette housing, a flexible fluid delivery tube in the housing. The flexible fluid delivery tube has a lumen configured to interface with the pump rotor and to deliver a flow of fluid from a fluid source as the rotor is rotated. A pressure-transmitting membrane is located in a wall of the cassette housing and in fluid communication with said fluid delivery lumen. The pressure-transmitting membrane flexes outwardly in response to a positive pressure in the lumen and flexes inwardly in response to a negative pressure in the lumen. The pressure-transmitting membrane detachably adheres to or presses against the pressure-sensing membrane to cause the pressure-sensing membrane to move in response to pressure changes in the flexible fluid delivery tube.

A medical device is disclosed, which includes: an operation reception unit; a position acquisition unit capable of acquiring position information of a detection target that is in contact with or proximity to the operation reception unit, the position information being based on a position on the operation reception unit; and a control unit that identifies an operation input by the detection target based on a change in the acquired position information.