A medical plunger pump and a chamber structure thereof. The chamber structure includes a barrel, where the barrel is provided with at least one cylindrical chamber which includes a piston working section in which a piston is able to reciprocate and a joint section where the piston is connected to a push rod. The joint section includes a first arc section that protrudes from the piston working section, where a first end of the first arc section is smoothly connected to a side wall of the piston working section, and a second end of the first arc section is bent and extendable along an axis of the piston working section. The medical plunger pump includes the above-mentioned chamber structure.

The present disclosure relates to a medical pump for dispensing a liquid. The medical pump comprises a housing, a receptacle and a piston. The housing comprises an inlet for receiving said liquid and an outlet for dispensing said liquid. The receptacle comprises a chamber and a passage that is in fluid communication with the chamber. The receptacle is received in the housing and is axially movable relative to the

housing from a filling position, wherein the passage fluidly communicates the chamber with the inlet, to a dispensing position, wherein the passage fluidly communicates the chamber with the outlet. The piston is received in the chamber and is configured such that when the receptacle is in the filling position the piston is axially moveable relative to the receptacle
and when the receptacle is in the dispensing position the piston is axially moveable relative to the receptacle.

A fluid injector system includes a control device operatively associated with each of two or more drive components configured to pressurize and inject a first fluid from a first fluid reservoir through a fluid conduit, and at least a second fluid from a second fluid reservoir through the fluid conduit. The fluid conduit is in selective fluid communication with the first and second fluid reservoirs. The control device has at least one processor programmed or configured to actuate a second drive component to pressurize and inject the second fluid through the fluid conduit, and while the second drive component is actuated, actuate a first drive component to introduce intermittent pulses of the first fluid to create a flow front interface between the first fluid and the second fluid in the fluid conduit to prevent backflow of the second fluid through the fluid conduit into the first fluid reservoir.

A fluid injector system includes a control device operatively associated with a first drive component configured to pressurize and inject a first fluid and a second drive component configured to pressurize and inject a second fluid. The control device includes at least one processor programmed or configured to: during a first phase of a multi-phase injection protocol, actuate at least the first drive component to inject the first phase; during the first phase of the injection protocol and prior to transitioning to a second phase of the injection protocol, actuate the second drive component to pressurize the second fluid relative to a pressure of the first fluid; and during the second phase of the injection protocol, actuate the second drive component to inject at least the second fluid so that a desired steady-state ratio of the first fluid and the second fluid in the second phase is reached.

The dosing apparatus comprises a conveying device (5), which is driven by at least one conveying drive (4), for conveying fluid from the interior (3) of a container (2). The fluid by means of the conveying device (5) is conveyable from the container to a dispensing opening (6). The conveying device (5) comprises a cylinder (7) having at least one intake opening (11) and at least one outlet opening (12) on an inner cylinder wall (8), and a first piston (9) and a second piston (10). The first piston (9) and the second piston (10) are mounted within the cylinder (7) so as to be displaceable in the longitudinal direction. Furthermore, the first piston (9) and the second piston (10) between the end sides thereof and together with a portion of the inner cylinder wall (8) delimit a variable fluid volume (17).

A medical plunger pump and a chamber structure thereof. The chamber structure includes a barrel, where the barrel is provided with at least one cylindrical chamber which includes a piston working section in which a piston is able to reciprocate and a joint section where the piston is connected to a push rod. The joint section includes a first arc section that protrudes from the piston working section, where a first end of the first arc section is smoothly connected to a side wall of the piston working section, and a second end of the first arc section is bent and extendable along an axis of the piston working section. The medical plunger pump includes the above-mentioned chamber structure.

A dual-action pump includes a cylinder, a piston and a controller. The cylinder includes first and second inlet-outlet ports, each of the first and second inlet-outlet ports is configured to alternately intake a fluid to the cylinder and output the fluid from the cylinder. The piston is configured to be moved within the cylinder in a periodic cycle that alternately reverses a direction of movement of the piston, so as to pump the fluid through the first and second inlet-outlet ports. The controller is configured to control the movement of the piston within the cylinder, including setting to the piston: (a) a first speed, during a first predefined interval that precedes reversing the direction of movement, (b) a second speed, larger than the first speed, during a second predefined interval that follows reversing the direction, and (c) a baseline speed, smaller than the first speed, outside the first and second intervals.

An infusion pump is disclosed. The infusion pump comprises a chamber having a distal end and a proximal end, and a longitudinal axis between the proximal end and the distal end. A piston is arranged for reciprocating movement within the chamber and along the longitudinal axis. At least one outlet is arranged from the chamber and may comprise an outlet valve. At least one inlet is provided into the chamber. The outlet and the inlet are axially spaced apart along the longitudinal axis of the chamber. A method for operating the pump is also provided.

A device (1) and the use thereof for dispensing fluid under aseptic conditions. The device (1) comprises conveying device (2) and container (3) with a variable inner volume. The conveying device comprises cylinder (4) with at least three openings (5, 6, 7) which are arranged along longitudinal central axis (11). Displaceable first and second pistons (9, 10) are arranged in the cylinder. The end faces (11, 12) of the pistons and inner wall (13) of the cylinder, delimit a variable fluid volume (14). The first opening is brought into fluidic communication with dispensing opening (15) and the second opening is brought into fluidic communication with the container. Each of the pistons comprise three seals (16, 16, 16) which are offset and sealingly close off the cylinder. Adjacent piston seals have inner spacing (di) which is equal to a shortest spacing (aA1) between two adjacent openings (5, 6 or 6, 7).

A disposable single-piston dual-action reciprocating pump part includes a single piston, an output port, and a balloon damper. The output port is configured for outputting fluid pumped by the single piston. The balloon damper is fitted in the output port, and the balloon damper is configured to suppress a pulsation in a flow rate of the outputted fluid.