A device for managing fluid is provided. The device includes: a drip chamber including: an inlet; and outlet; a check valve positioned between the inlet and the outlet, the check valve configured for managing fluid flowing between the inlet and the outlet; and an elastic element. The combination of the check valve and the elastic element limits the extent to which the one way valve may be opened by brief transient pressures appearing at the outlet of the drip chamber. This limiting effect improves the accuracy of fluid delivery in setups such as piggyback or Secondary Mode infusions of two fluids using a single pump.

An infusion set check valve assembly includes a self-contained housing that defines inlet ports and an outlet port. The assembly also includes at least one check valve disposed within the self-contained housing between the outlet channel and at least one of the inlet ports. The at least one check valve is configured to open for a first fluid to flow from a first inlet to a patient line via an outlet channel while a second fluid also flows from a second inlet to the patient line via the outlet channel. The at least one check valve closes to prevent the first fluid from flowing to the patient line via the outlet channel while the second fluid flows to the patient line.

A check valve assembly having an inlet and an outlet for medical fluids, comprising a valve body, wherein the check valve assembly in an initial state allows a flow of a working fluid and/or a sterilization fluid through the check valve assembly in both directions of flow, that is from the inlet to the outlet and vice versa, and wherein the check valve assembly in an operating state allows only one direction of flow of the working fluid, wherein the check valve assembly comprises a pin-pin-reception connection, which is embodied so that the check valve assembly can be transferred from the initial state into the operating state by applying force on the pin-pin-reception connection and/or by an impression of path on the pin-pin-reception connection.

Provided are a valve member and a milking machine-EH that are easy to wash. The valve member enables an internal passage to temporarily retain milk when the milking machine is in a negative pressure state, and enables the milk retained in the internal passage to be discharged when the milking machine is in a normal pressure state. The valve member is provided with a cap that is attached to the milking machine. The cap is provided with a partition wall that separates a first space on the milk inflow side and a second space on the milk outflow side. A through hole in the partition wall allows communication between the first space and the second space. A valve body disposed in the second space closes the through hole when the negative pressure state is established, and opens the through hole when the normal pressure state is established.

A filter for medical infusion lines includes a box-like body having an inlet connector and inside which there is arranged a plate-like element on whose one or both opposite faces there are formed respective channels placed in communication with an outlet connector. Filtering hydrophilic membranes separate the channels from at least one interspace placed in communication with the inlet connector. With the outlet connector there is operatively associated an overpressure valve incorporated in the box-like body of the filter.

A bolus control device for use with an injection device includes a valve body having a proximal end opposite a distal end. The valve body defines a fluid channel therethrough to allow a passage of medical fluid from the proximal end to the distal end. A connector at the proximal end and is configured for connecting to a fluid inlet line. A connector subassembly at the distal end and is configured for connecting to a fluid outlet line. A compressible check valve is disposed within the fluid channel, such that the compressible check valve is adjustable to control a cracking pressure at which the compressible check valve closes.

A method for administering successive dosages of a medical fluid from a fluid injection device to a patient via an IV set during a medical procedure comprising: obtaining an IV set having a primary flow line defining a primary fluid path, and an access point defining an access port; establishing a fluid connection with a primary fluid in a fluid source with the primary fluid path; connecting a fluid injection device (e.g., syringe) to an unidirectional access port assembly comprising an anti-backflow device; injecting a first dosage of a secondary fluid (medication) from the fluid injection device into through an anti-backflow device (e.g., one-way check valve) and into the primary fluid path; maintaining the connection of the fluid injection device to the unidirectional access port assembly; and injecting a second dosage, or n number of additional dosages, of the secondary fluid through the anti-backflow device. Associated devices and systems are disclosed.

A device for managing fluid is provided. The device includes: a drip chamber including: an inlet; and outlet; a check valve positioned between the inlet and the outlet, the check valve configured for managing fluid flowing between the inlet and the outlet; and an elastic element. The combination of the check valve and the elastic element limits the extent to which the one way valve may be opened by brief transient pressures appearing at the outlet of the drip chamber. This limiting effect improves the accuracy of fluid delivery in setups such as piggyback or Secondary Mode infusions of two fluids using a single pump.

Check valve are disclosed having a primary seal and a secondary seal, where the primary and secondary seals resist movement of a fluid through the check valve, and the secondary seal can provide a backup seal in an instance where the check valve does not function as intended. The primary and secondary seals can be formed by first and second sealing ridges, respectively, and a valve body can be positioned within the check valve, between a valve support, the first sealing ridge, and a second sealing ridge. The valve body is configured to move relative to the first and second sealing ridges, and can have a position wherein a portion of the valve body is engaged against any of the first and second sealing ridges.

The disclosed subject matter relates to a valve device that includes a valve member located within a housing in which the valve member's operation can be bypassed. For example, the valve device can include a bypass device that has an input structure, a motion conversion structure, and an output structure. The input structure can include a portion configured to resiliently deform if a valve opening input force is applied to the input structure in an input direction. The motion conversion structure can be configured to convert the valve opening input force into motion of the output structure in an output direction that is non-parallel to the input direction. The output structure can be configured to move the valve member (e.g., from a closed state to an opened state in order to bypass normal valve operation) if the motion conversion structure is displaced in the input direction. The valve device can be used in various manners, and is particularly suitable for use in a patient fluid delivery system.