Devices, systems, and methods for minimization of backlash in a syringe pump are described herein. Syringe pumps may comprise a syringe including a cylindrical body and a plunger, and a controller. The plunger may comprise a linear gear that may operably couple with a circular gear in the controller. The controller may be configured to bias the circular gear in a biasing rotational direction, thereby positioning the plunger to move towards a biasing translational direction. The methods may comprise determining a backlash compensation amount, determining a fluid transfer movement amount, moving at least one component of the syringe pump the backlash compensation amount and the fluid transfer movement amount in a first direction, and moving the at least one component of the syringe pump a biasing movement amount in a second direction opposite the first direction to re-engage the first gear and the second gear to minimize backlash.

A fluid delivery device includes: a fluid-filled cartridge comprising an outlet; a syringe comprising a substantially cylindrical syringe barrel having an open end and a fluid dispensing end; and a plunger rod configured to be received within the open end of the syringe barrel. The plunger rod comprises: a first end having a sealing member provided in sealing engagement with an inner wall of the syringe barrel such that a first syringe chamber is provided between the first end of the plunger rod and the fluid dispensing end of the syringe barrel; a second end extending out of the open end of the syringe barrel and having a cartridge-receiving chamber having a connection mechanism positioned therein for connecting the outlet of the cartridge thereto. The plunger rod also includes a fluid channel extending from the connection mechanism to the first end of the plunger rod.

A syringe includes a body and a plunger movably disposed within the body. The syringe may be used with an injector including a drive member. The drive member preferably includes at least one pin adapted to form a retractable abutting connection with an interior of a plunger to enable the drive member to retract the plunger with the body of the syringe.

A calibration system for calibrating a pressure output of a fluid injector having a housing configured for connecting to the fluid injector; a drive member engagement portion configured for contacting a drive member of the fluid injector; a compressible member, which may have a known modulus of compression, connected at its proximal end to the drive member engagement portion, wherein the compressible member is compressed with movement of the drive member of the fluid injector between a first, uncompressed position and a second, at least partially compressed position of the fluid injector in a distal direction; and a sensor connected to the compressible member is described. The sensor is configured for measuring at least one of a force imparted by the drive member and a displacement of the drive member when the compressible member is in the second, at least partially compressed position. The system may generate a calibration curve for the drive member of the fluid injector and allow the generation of a fault condition. Methods for calibrating a fluid injector are also described.

An injection system is described that receives, from one or more sensors, a first group of one or more signals indicating a current volume of injection fluid dispensed from a fluid reservoir at a first time. The injection system determines, based on the first group of one or more signals, that a difference between a dispensed volume limit and the current volume of the injection fluid dispensed from the fluid reservoir at the first time is less than a necessary volume of fluid required to complete both a systolic injection phase and a diastolic injection phase. The injection system further, responsive to determining that the difference is less than the necessary volume of fluid required to complete both the systolic injection phase and the diastolic injection phase, controls the injection system to refrain from performing each of the systolic injection phase and the diastolic injection phase.

A medical device includes a first housing portion (FHP) and a second housing portion (SHP) configured to be to be movable relative to each other from a first position to operatively engage at a second position to couple at least one of a drive device and a needle-inserting device supported by one of the FHP and the SHP to a reservoir supported by the other of the FHP and the SHP. Electronic circuitry configured to detect at least one of a first magnetic interaction between a magnet and at least one of a first magnetically attractive material and a first magnet-responsive device and a second magnetic interaction between the magnet and at least one of a second magnetically attractive material and a second magnet-responsive device, and to provide a signal or a change in state in response to detecting at least one of the interactions.

A medical pump includes a cuboid pump housing and a front lid that is pivotably hinged to the pump housing. The front lid includes a display, in particular a touch display, and/or operating elements. The front lid is attached to the pump housing with at least one first hinge element and at least one second hinge element. The at least one first hinge element and/or the at least one second hinge element includes or forms at least one electrical connection between the pump housing and the front lid for electrical linking and exchange of data.

A reader system for reading information on at least one identification tag associated with a syringe connected to a fluid injector has a detector and a background screen spaced apart from the detector such that at least one of the at least one identification tags is positioned in an optical path between the detector and the background screen when the syringe is connected to the fluid injector. The reader system further has an illumination system configured for illuminating at least a portion of the background screen. The detector is configured for detecting and decoding the at least one identification tag. Methods for reading information on at least one identification tag associated with a syringe are also described.

A digital syringe is used with conventional polymer disposable syringe construction to be practical in the medical environment. Errors associated with the larger volumes of the syringes (which exacerbate minor errors in plunger position) and the flexibility and dimensional variations of the polymer plungers are accommodated by direct measurement of the syringe plunger position rather than indirect measurement of motor position and inference of syringe plunger position. This direct measurement eliminates mechanical tolerances (“stack up”) in the motor, gear train, and lead screw on plunger movement, an effect exacerbated by flexibility of the plunger and changes in syringe resistance and medicament viscosity, for example, with different medicaments or when the syringe is refrigerated. The digital syringe may be combined with the motor unit to provide additional versatility.

An engagement mechanism associated with a reciprocally movable piston of a fluid injector is configured for releasably engaging an engagement portion at a proximal end of a rolling diaphragm syringe having a flexible sidewall configured for rolling upon itself when acted upon by the piston. The engagement mechanism has a plurality of engagement elements reversibly and pivotally movable about a pivot pin relative to the engagement portion of the syringe between a first position, where the plurality of engagement elements are disengaged from the engagement portion of the syringe, and a second position, where the plurality of engagement elements are pivotally movable about the pivot pin in a radially inward direction to engage with the engagement portion of the syringe. The engagement mechanism further has a drive mechanism for moving the plurality of engagement elements between the first position and the second position.