A system and method for correcting a volume of fluid delivered by a fluid injector during an injection procedure is described. The method included determining and compensating for a volume factor associated with compliance of the fluid injector system and correcting for the volume by one of over-driving the distance that the drive member travels in a fluid reservoir, under-driving the distance that the drive member travels in the fluid reservoir, or lengthening or shortening a fluid delivery time.

A system comprises a syringe pump and a special designed syringe. The syringe pump includes a housing with a flange holder for receiving a flange of the syringe barrel, an electrical motor disposed inside the housing, a plurality of gears driven by the electrical motor, a leadscrew connected to the plurality of gears, and a cage housing for housing the leadscrew and for holding at least partially the plunger. The flange of the plunger inserts into the flange holder, the leadscrew engages the plunger and moves the plunger in and out of the syringe.

A parenteral nutritional diagnostic system, apparatus, and method are disclosed. In an example embodiment, a parenteral nutritional diagnostic apparatus determines muscle quantity and muscle quality of a patient's psoas muscle to determine a nutritional status of the patient. An image interface is configured to receive a medical image including radiodensity data related to imaged tissue of the patient. The apparatus also includes a processor configured to use the medical image to determine a tissue surface area for each different value of radiodensity and determine a distribution of the tissue surface area for each radiodensity value. The processor is configured to determine muscle quality by locating a soft tissue peak within the distribution that corresponds to a local peak in at a region related to at least one of muscle tissue, organ tissue, and intramuscular adipose tissue. The processor determines the nutritional status of the patient based on soft tissue peak.

Syringe pump controllers which memorialize the process of hydrodynamic isotonic saline delivery (HIFD) to reverse acute kidney injury are disclosed. In some embodiments, the syringe pump controllers are constructed to control syringe pump(s) to deliver a defined volume of saline at a prescribed perfusion rate while monitoring renal vein pressures during the infusion. In some embodiments, the syringe pump controllers have safety features designed to shut off the infusion if the renal vein pressure goes above set safety limits.

An infusion pump can be configured to modulate a drive motor based on perceived infusion pressure requirements for quieter, more energy-efficient operation of the drive motor. The infusion pump can include an electrical motor having a variable output torque based on the electrical current input, a plunger head sensor configured to detect a force between a plunger driver and a plunger of a medicament container, and a control module configured to regulate the electrical current input to the electrical motor based on the detected force between the plunger driver and the plunger medicament container. The electrical current input for such an infusion pump can be incrementally reduced according to defined magnitudes of detected force.

An assembly for retaining a pressure jacket (134) and a syringe (132) on a fluid injector, the assembly including a base plate (1902) comprising a body (1904); at least a first retaining arm (1910a) and a second retaining arm (1910b) operatively mounted on the body of the base plate, the first retaining arm having a first retaining surface at a distal end thereof and the second retaining arm having a second retaining surface at a distal end thereof, wherein the first retaining surface and the second retaining surface are configured for abutting a distal surface of at least one of the pressure jacket and the syringe; a linkage assembly operatively connected to at least one of the first retaining arm and the second retaining arm, wherein the linkage assembly is configured to move at least one of the first retaining arm and the second retaining arm between at least a first open position and a closed position.

In some embodiments, a system can include a fluid delivery assembly and a drive assembly. The fluid delivery assembly is configured to be releasably mechanically and, optionally, electrically coupled to the drive assembly. When the fluid delivery assembly is releasably coupled to the drive assembly, the drive assembly can control delivery of fluid from the fluid delivery assembly (e.g., to a patient). For example, the drive assembly can be releasably coupled to the fluid delivery assembly to control delivery of fluid from the fluid delivery assembly to provide continuous (e.g., non-pulsatile) fluid flow from the fluid delivery assembly.

The injection apparatus 100 is provided that can allow repair or replacement of an actuator 130 while maintaining a drip-proof state, and that can further maintain the drip-proof state without a cover. The injection apparatus 100 includes a syringe holder 110 on which a syringe filled with a liquid medicine is mounted, a presser 115 that pushes out the liquid medicine from the mounted syringe, an actuator 130 that moves the presser 115 forward or backward, the actuator 130 including a feed screw nut 134, a feed screw shaft 133, a motor 132, and a transmission mechanism 180 that transmits rotation from the motor 132 to the feed screw shaft 133, wherein the feed screw nut 134, the feed screw shaft 133, the motor 132, and the transmission mechanism 180 are housed in a case 170 of the actuator 130.

A fluid injector system includes at least one syringe configured for injecting medical fluid and a fluid path assembly in fluid communication with the at least one syringe, the fluid path assembly including at least one air detection region. The system includes an air detector configured to detect one or more air bubbles in a fluid path associated with the air detection region, at least one shutoff valve at a distal end of the fluid path assembly, and at least one processor programmed or configured to actuate the shutoff valve in response to the air detector detecting the one or more air bubbles in the fluid path associated with the air detection region to prevent fluid flow out of the fluid path assembly. The fluid path assembly has a length greater than a distance that an air bubble can travel or expand during an actuation time of the shutoff valve.

A valve assembly for a fluid injector system includes a valve housing, a first port configured for fluid communication with a fluid injector, a second port, a third port, and a fourth port configured for fluid communication with a patient line. The valve assembly includes an air detection region associated with the first port, a fluid path length having a proximal end in fluid communication with the second port and a distal end in fluid communication with the third port, and a valve element defining a first fluid path and a second fluid path. The first fluid path provides fluid communication between the first and second ports in a delivery position of the valve housing. The second fluid path provides fluid communication between the third and fourth ports in the delivery position. The third port is isolated from the fourth port in a stop position of the valve housing.