A pumping finger subassembly for a peristaltic infusion pump has a housing, a pinch member, a block member, and at least one biasing spring. The housing includes a transverse slot, a first side wall, and an open second side through which the pinch member and biasing spring(s) are inserted into the transverse slot. The block member includes a foot portion and a side wall portion. The foot portion is insertable into the housing through the open second side such that the block member is constrained against movement relative to the housing and the side wall portion of the block member opposes the first side wall of the housing, whereby the pinch member is supported on both lateral sides to prevent tilting of the pinch member.

Pump heads for peristaltic pump assemblies are provided. For example, a pump head for a peristaltic pump comprises an occlusion bed, a rotor guide, a rotor assembly positioned between the occlusion bed and the rotor guide, and a pathway for tubing. The pathway comprises an inlet portion, an outlet portion, and a connecting portion that connects the inlet and outlet portions. The inlet portion is defined between the occlusion bed and the rotor guide, the outlet portion is defined between the occlusion bed and the rotor guide, and the connecting portion is defined between the occlusion bed and the rotor assembly. Further, the occlusion bed is movable with respect to the rotor guide and the rotor assembly. In exemplary embodiments, the pump head urges fluid flow through the tubing to supply a cooling fluid to a medical probe assembly for delivering energy to a patient's body.

A pump system for pumping a coolant fluid for cooled radiofrequency ablation treatment includes a housing having a front, a back, a right side, a left side, a top surface, and a bottom surface, and a plurality of peristaltic pump assemblies. The top surface of the housing includes a central channel between at least two of the peristaltic pump assemblies configured to drain fluid away from the front of the housing. A cooled radiofrequency ablation system additionally includes a pump system and a generator having mating surfaces such that the pump system can sit stably on top of the generator.

A pumping finger subassembly for a peristaltic infusion pump has a housing, a pinch member, a block member, and at least one biasing spring. The housing includes a transverse slot, a first side wall, and an open second side through which the pinch member and biasing spring(s) are inserted into the transverse slot. The block member includes a foot portion and a side wall portion. The foot portion is insertable into the housing through the open second side such that the block member is constrained against movement relative to the housing and the side wall portion of the block member opposes the first side wall of the housing, whereby the pinch member is supported on both lateral sides to prevent tilting of the pinch member.

A platen assembly positionable opposite a pumping mechanism of an infusion pump has a first platen member rotatably coupled to the pump to pivot about a first hinge axis and a second platen member rotatably coupled to the first platen member to pivot about a second hinge axis different from the first hinge axis. When the platen assembly is in a pump operating position, respective platen surfaces of the platen members follow a single surface profile, for example an arcuate surface profile in the case of a curvilinear peristaltic pump. The platen assembly may have a damage-tolerant design including a plurality of alignment counter-features arranged to mate with corresponding alignment features on the pump, wherein the platen assembly may still close after the pump is dropped or damaged only if resulting deformation of the platen assembly is within an allowable tolerance for safe pumping.

Disclosed herein is a peristaltic pump configured to receive a fluid line and comprising a stator having a pump race, a rotor surrounded by the pump race and configured to rotate about a rotor axis. The rotor comprises a contrasting element configured to abut against the fluid line. The contrasting element is movable between a released position where the contrasting element is away from the pump race, and an operative position where the at least one contrasting element is approached to the pump race and configured to abut against the fluid line. In the released position, the contrasting element is at a distance from the pump race higher than in the operative position. The peristaltic pump further comprises a releasing member borne by the stator and movable between an active position and a rest position, where the releasing member is spatially shifted with respect to the rotor axis.

An air maintenance system includes a rotating inner ring secured to a vehicle wheel, a stationary outer ring maintaining a constant angular position, an occlusion roller rotationally fixed to the stationary outer ring, the occlusion roller having a protruding portion centered axially at a radially outer surface of the occlusion roller with axially outer portions of the occlusion roller being radially recessed from the protruding portion and supported by bearing surfaces of the rotating inner ring, spacer rollers rotationally fixed to the stationary outer ring and rotationally supported by the bearing surfaces, and a flexible tube defining a pump cavity, the air maintenance system pumping a fluid from the ambient environment into a pneumatic tire by applying an occluding force against the flexible tube, periodically occluding portions of the pump cavity. The spacer rollers have axially outer surfaces for rotational support by bearing surfaces of the rotating inner ring and a recess centered axially at the outer surface of the spacer rollers for avoiding any contact between the spacer rollers and the flexible tube.

A peristaltic pump for pumping a fluid includes a flexible tube and a roller. The flexible tube has inner and outer tubular opposed walls. The inner wall defines a through passage to receive the fluid. The roller has an outer contact surface. The peristaltic pump is configured to compress the flexible tube with the contact surface of the roller to thereby force the fluid through the through passage. At least the contact surface of the roller is formed of borosilicate glass.

In one embodiment, a feed pump of a tube pump type is used for supplying a processing liquid. The tube pump has a squeezing member that moves from a first axial position of a tube at which the squeezing member starts pinching of the tube, to a second axial position at which the squeezing member leaves the tube after feeding the processing liquid toward an ejecting part such as a nozzle. Only one pinched part pinched between the squeezing member and a guide member is formed between the first axial position and the second axial position of the tube, and the only one pinched part moves along the axial direction of the tube, during feeding of a dose of the processing liquid toward the ejecting part.

A peristaltic pump includes a driver, a pump body, a hose, a rotor and a connecting member. The driver includes a supporting shaft. The pump body includes a chamber housing the rotor. The hose is assembled to an internal side of a wall of the chamber. The connecting member connects the driver with the rotor, and is received in the chamber. The rotor is configured to sequentially squeeze the hose to cause medium in the hose to flow. The connecting member and the rotor rotate about and are supported by the supporting shaft. The medical peristaltic pump has a simple structure and is easy to operate.