A medical pump, comprising: a fluid housing having a plurality of intake openings, sealed by at least one intake valve, and an outlet opening sealed by an outlet valve; a piston which is sealing the fluid housing and connected to a drive mechanism, the drive mechanism pulls the piston to draw fluid from one of the plurality of intake openings and pushes the piston to discharge the fluid into the outlet opening; and a selecting valve enclosing at least two tubes, each providing fluid to one of the plurality of intake openings, wherein the selecting valve closes one of the at least two tubes while opening another of the at least two tubes.

Apparatus is described for administering a substance to a subject. A vial contains the substance and a stopper is disposed within the vial and is slidably coupled to the vial. A first threaded element is (a) rotatable with respect to the vial and (b) substantially immobile proximally with respect to the vial during rotation of the first threaded element. A second threaded element is threadedly coupled to the first threaded element. At least a distal end of the second threaded element is substantially non-rotatable with respect to the vial, and the distal end of the second threaded element defines a coupling portion that couples the second threaded element to the stopper. The first threaded element, by rotating, linearly advances the stopper and at least the distal end of the second threaded element toward a distal end of the vial. Other embodiments are also described.

An infusion device includes a housing with an interior chamber sized and configured to hold at least a flange and plunger of a syringe, a trigger held by the housing, and a lever in communication with the trigger and including an upwardly extending cam with a cam path having an upper end. The cam is in communication with the flange of the syringe. In response to actuation of the trigger to dispense fluid from the syringe, the upper end of the cam travels upward above the syringe and longitudinally toward a dispensing end of the syringe to linearly translate the plunger of the syringe in a first direction to dispense fluid from the syringe. To refill fluid into the syringe, the upper end of the cam travels downward and longitudinally away from the dispensing end of the syringe to linearly translate the plunger in a second direction to intake fluid.

A syringe pump usable with a syringe having a barrel and a plunger, the plunger having a plunger flange, comprises a barrel retaining mechanism for holding the barrel, and a drive mechanism having a drive head assembly for driving the plunger along its axis. The drive head assembly comprises a flange retaining mechanism for retaining the plunger flange to the drive head assembly, and a load measuring device for measuring compressive force on the plunger flange, the load measuring device being movable within the drive head assembly transverse to the axis. The syringe pump comprises a self-centering mechanism having a pushing component which is arranged to move the load measuring device within the drive head assembly until the pushing component abuts against the plunger flange, such that a center of the load measuring device is aligned with the axis.

A metering device for dispensing medication fluid includes: a spindle unit, a drive unit for rotationally driving the spindle unit, and a reservoir for the medication fluid. The reservoir has a wall, which defines a cross-sectional area of the reservoir, and a plunger located in the reservoir. The rotational driving of the spindle unit causes a translational motion of the plunger, and therefore displaces medication fluid. Because the product of the cross-sectional area of the reservoir in the unit mm.sup.2 and the spindle pitch in the unit mm/degree is less than 0.13 mm.sup.3/degree and the medication fluid is a liquid insulin having a concentration in a range of U20 to U100, a metering system can be formed that is suitable specifically for the CSII therapy of children and youth, where high discharge accuracy is important for good therapy control.

A pump device (10) operable with a syringe (11) having a barrel (12) and a plunger (13). The pump device (10) is operable to cause relative movement between the syringe plunger (13) and the syringe barrel (12) for discharging fluid from the syringe (11). The pump device (10) comprises a portion (31) adapted to engage the syringe barrel (12), and a drive mechanism for moving the syringe plunger (13) relative to the syringe barrel (12) to discharge fluid from the syringe (11). The drive mechanism comprises an actuator (45) adapted to engage the syringe plunger (13) and a power mechanism (61) for moving the actuator (45) to effect movement of the syringe plunger (13) relative to the syringe barrel (12). The pump device (10) thus provides a syringe driving means. There is also provided an infusion system comprising a syringe driving means, the syringe driving means comprising the pump device (10). Further, there is provided an infusion system comprising a syringe driving means operable to maintain a constant pressure within a syringe and tubing with viscosity corrections for various antibiotic concentrations.

A plunger for movably mounting within a cavity or barrel of a syringe. The plunger includes a contact face having a flange movably mounted thereto, wherein the flange is movable between an open configuration wherein an opening is formed between the flange and a portion of the plunger, the opening configured for engagement with an IV hook or other engagement member, and a closed configuration wherein the upper surfaces of the contact face and the flange are generally planar with one another.

A motorized injection and aspiration system and methods for its use, where the motorized injection and aspiration system comprises (a) a syringe coupled to a needle, wherein the syringe includes a plunger, (b) a cannula, (c) a tube having first and second ends, wherein the first end is coupled to the needle and the second end is coupled to the cannula, (d) a syringe driver to drive the plunger, (e) at least one foot pedal, (f) a step motor, and (g) a control unit in communication with the step motor, the syringe driver and the at least one foot pedal.

A medical liquid administration device includes a flowing portion including a flow path through which a medical liquid is to flow; a medical liquid storage communicating with the flowing portion, the medical liquid storage storing the medical liquid that is to be fed to the flowing portion; a drive mechanism comprising a motor configured to generate a driving force for feeding the medical liquid stored in the medical liquid storage to the flow path; a detection unit configured to detect whether an operating state of the drive mechanism is within a preset range; and a controller configured to determine a blockage in the flowing portion and a failure in the drive mechanism.

An automatic injection device has an insertion needle configured to be inserted into a patient and a drug container which contains a pharmaceutical product. The drug container includes a plunger. The automatic injection device also has a fluid path which fluidly connects the drug container to the insertion needle. The automatic injection device further has a drive system configured to cause linear movement of the plunger to force the pharmaceutical product into the fluid path. The drive system has a driving element and a movable element. The automatic injection device additionally has electronics configured to provide a signal to the drive system to move the plunger. The movable element has an outer magnet at least partially surrounding the drug container and an inner magnet inside the drug container.