An occlusion detection device detects an occlusion of a flexible fluid path on either of upstream and downstream sides of a pump mechanism, the pump mechanism transporting a liquid through the fluid path by elastically deforming the fluid path. The occlusion detection device is provided with: an occlusion sensor that is disposed on the downstream side of the pump mechanism and detects an internal pressure of the fluid path during a liquid transporting operation of the pump mechanism; and a data processing circuit that analyzes on which side of the upstream and downstream sides of the pump mechanism the occlusion of the fluid path occurs, based on a change of the internal pressure of the fluid path detected by the occlusion sensor and outputs an analysis result.

A system for monitoring upstream flow characteristics for a pump is provided. The system may receive one or more outputs from a fluid level sensor coupled with a pump. The system may detect based on at least the one or more outputs, an abnormal upstream flow condition in the pump, such as a full upstream occlusion in the tube, a partial upstream occlusion in the tube, an empty reservoir, and/or a backflow of the fluid into the drip chamber. The system may adjust, based on the detection of an abnormal upstream flow condition in the pump, operation of the pump.

An infusion device includes a pump for pumping a medical fluid from a fluid container through a delivery line towards a patient at a flow rate, a sensor for measuring a force on the pump or the delivery line, and a processor device configured to derive, from the force measured by the sensor, a pressure value indicative of the pressure in the delivery line and to compare the pressure value to a threshold value for determining whether an occlusion in the delivery line is present. A storage device stores a compliance value associated with the pump and/or the delivery line, and the processor device is configured to compute, from the stored compliance value, the flow rate and the threshold value, an estimate of a duration between the time of an occurrence of an occlusion and the time at which the pressure value exceeds the threshold value.

Force sensing assemblies for an infusion pump are provided. A force sensing assembly includes a processor and an occlusion sensor coupled to the processor. The occlusion sensor is positioned opposed to an occluder valve when the platen is closed. The force sensing assembly measures one or more forces exerted on a fluid tube during a pump cycle. Infusion pump assemblies, methods of operating an infusion pump with a force sensing assembly, systems for controlling an infusion pump and an infusion device are also provided.

The present invention relates to a sensing device, a method of use of a sensing device and a method of manufacture of a sensing device. Embodiments are generally configured as sensor arrays for detecting a pressure change within an infusion line to pre-empt or detect line occlusions in the administration of medical infusions. Generally, embodiments comprise a support component having a support surface for mounting thereon one or more electrically connected switches, a length of expandable tubing for passing a fluid therethrough and are secured to the support surface and in physical contact with the electrically connected switches. The one or more electrically connected switches forms a sensor array adapted to sense expansion of the expandable tubing indicative of pressure changes resulting from line occlusions.

A system for monitoring upstream flow characteristics for a pump is provided. The system may receive one or more outputs from a fluid level sensor coupled with a pump. The system may detect based on at least the one or more outputs, an abnormal upstream flow condition in the pump, such as a full upstream occlusion in the tube, a partial upstream occlusion in the tube, an empty reservoir, and/or a backflow of the fluid into the drip chamber. The system may adjust, based on the detection of an abnormal upstream flow condition in the pump, operation of the pump.

A waste-reducing pumping system and method for delivering a liquid to a patient according to a predetermined therapy protocol is characterized by a stored flush mode routine executable by a processor after an end-of-therapy stoppage of a pumping mechanism, whereby the pumping mechanism is operated to deliver residual liquid remaining in downstream tubing of an administration set to the patient to prevent the residual liquid from being wasted or manually administered at an unsafe rate.

A syringe pump is disclosed that includes a pressure sensor assembly, a plunger, first and second pressure sensors, and a processor. The pressure sensor assembly senses a force and includes the plunger having a sensing surface configured to receive the force, the first pressure sensor operatively coupled to the plunger and configured to estimate the force applied to the sensing surface, and the second pressure sensor operatively coupled to the plunger and configured to estimate the force applied to the sensing surface. The processor is coupled to the first and second pressure sensors to estimate a magnitude of the force.

A liquid medicine administration device configured to prevent leakage of liquid medicine when a blockage occurs in a delivery path of the medicine includes: a liquid medicine container having an opening at a tip end through which liquid medicine can be discharged; a gasket slidable in the container for expelling the liquid medicine; a plunger to press the gasket; a housing; a drive mechanism that advances the plunger toward the container tip; and a rotation restriction unit that restricts rotation of the plunger with respect to the housing. The drive mechanism includes: a motor a feed screw rotatable in response to motor rotation; and a transmission unit that transmits drive torque from the motor to the feed screw. The transmission unit includes a canceling unit that cancels transmission of drive torque from the motor to the feed screw, when receiving torque equal to or greater than a preset cancellation torque.

A syringe pump is disclosed that includes a body, a syringe seat, a syringe actuator, a memory, and one or more processors. The syringe seat is coupled to the body. The syringe actuator is configured to actuate a syringe secured within the syringe seat. The memory is configured to store a plurality of instructions. The one or more processors, in accordance with the plurality of instructions, is/are configured to: prime the syringe pump in a prime phase; determine if an occlusion exists during the prime phase using a first test; stop the prime phase; initiate fluid delivery into a patient; enter into a start-up phase; determine if an occlusion exists using a second test during the start-up phase; transition from the start-up phase into a steady-state phase; and determine if an occlusion exists during the steady-state phase using a third test.