Abstract: A syringe plunger/jacket assembly may comprise a flexible jacket attached to a rigid plunger. The jacket may comprise at least two sealing rings (front and rear) that prevent fluid from leaking out of the rear of the barrel during injection of fluid from the syringe. The rear sealing ring may or may not contact or seal the interior surface of the syringe barrel in an unloaded state. In the loaded state, when force is applied in the direction of the forward discharge end of the syringe, pressure is created on the jacket. This condition causes the rear seal to expand and contact and/or seal the interior surface of the syringe barrel.

Abstract: A device and method for the infusion of medicinal fluid at a controlled flow rate to a wound site or the blood stream of a patient is disclosed. A pump delivers fluid under pressure from a fluid source through a continuous and substantially constant flow path and through a supplemental bolus dose flow path. A large volume bolus dose reservoir accumulates a large quantity of fluid from the bolus dose flow path and holds the fluid under pressure. A flow regulator controls the fill rate of the large volume bolus reservoir. The large volume supplemental bolus dose is released from the bolus reservoir upon patient activation of a valve. The release rate of the bolus dose is controlled by the decompression of an elastomeric sphere or spring chamber, by the pressure gradient at the valve and/or by optional flow control tubing.

Abstract: A peritoneal dialysis system includes: (i) an enclosure; (ii) a stepper motor housed by the enclosure; (iii) a pump head in operable communication with the stepper motor; and (iv) a disposable unit including at least one flexible membrane attached to a rigid piece, the enclosure configured to receive the disposable unit such that the stepper motor can move the pump head towards and away from the flexible membrane to cause, (a) the flexible membrane to move outwardly with respect to the rigid piece as the pump head is moved away from the disposable unit, and (b) the flexible membrane to move inwardly with respect to the rigid piece as the pump head is moved away from the disposable unit.

Abstract: A cassette having an elastomeric sheet that is bonded or mechanically attached to a rigid substrate. A flow channel is molded into the rigid substrate that corresponds to a flow channel molded into the elastomeric sheet. The cassette is used in combination with a peristaltic pump having pump head rollers that are mounted radially from the axis of rotation of the pump motor so as to compress the elastomeric flow channels against the rigid substrate during operation. The flow channels molded into the rigid substrate have smooth, fluid lines free from sharp edges and abrupt direction changes and correspond with the fluid channels molded into the elastomeric sheet so as to provide a transition region with a relatively constant cross-section over its entire length that approximates the cross-sectional area of the flow channels molded into the rigid substrate and the fluid channel molded into the elastomeric sheet so that the entire fluid path is of relatively constant cross-sectional area.

Abstract: A controller for operating a pumping apparatus to supply fluid to a patient through a pump set includes a processor programmed to instruct a first source of electromagnetic radiation to emit electromagnetic radiation in a direction for striking a safety interlock of the pump set. The processor activates a first electromagnetic radiation detector to detect the electromagnetic radiation emitted from the first source. The processor instructs a second source of electromagnetic radiation to emit electromagnetic radiation in a direction for striking the safety interlock. The processor activates a second electromagnetic radiation detector to detect the electromagnetic radiation emitted from the second source. The processor controls the pumping apparatus to operate for pumping fluid in the pump set only when electromagnetic radiation emitted from the first source is detected by the first detector and when the electromagnetic radiation emitted from the second source is not detect by the second detector.

Abstract: A medical pump includes a chassis having a fixed seat, and a main carriage having a carriage footing for receiving a fluid delivery device and restricting its movement. An actuator automatically moves the main carriage between open and closed positions to engage the fluid delivery device to the seat. The seat establishes the position of both the main carriage and fluid delivery device in the closed position. The actuator is connected to the main carriage by a rear carriage assembly having a manual release element for disengaging the actuator from rear carriage assembly and thereby from the main carriage. A processing unit detects jam conditions by processing carriage position data and electrical load data from the actuator.

Abstract: Delivery tubes having a flexible portion and pump mechanisms (4) for use therewith include features that reduce losses of an active therapeutic compound within a fluid passing through the delivery tube (17). The delivery tube can include inner (30) and outer (31) layers that are inert to reaction with the therapeutic compound and that restrict diffusion of other compounds, respectively. Rollers (83) of a peristaltic pump mechanism (80) can include structural features that reduce physical impacts on molecules of the therapeutic compound. Related systems, apparatus, and/or articles are also described.

Abstract: An ambulatory pump comprising a reservoir (1) for holding the fluid to be pumped and having an outlet (7) through which fluid is expelled in use; a closure (8) device movable relative to the reservoir; and an actuator (14) for moving the closure device relative to the reservoir, wherein the reservoir is arranged in a spiral pattern.

Abstract: A pump for rapidly discharging irrigation fluid to a surgical site. The pump includes a cabinet with an opening. Inside the pump there is a static plate and a dynamic plate that extends towards/retracts from the static plate. The space between the plates is a bag well in which a bag containing irrigation fluid can be inserted/replaced through the cabinet opening. A lid covers the opening. A sensor monitors the open/closed state of the lid. A drive motor actuates the dynamic plate. A control unit regulates the actuation of the motor. Only when the lid sensor determines that the lid is closed does the control unit actuate the motor. The dynamic plate can be placed in various open positions relative to the static plate so bags containing different volumes of fluid can be used with the pump.

Abstract: The present invention relates to a medication delivery device for delivering a set dose of medicament, the medication delivery device comprising pump means having first and second pump chambers. The first pump chamber is adapted to transfer medicament from a first collapsible reservoir to an outlet arrangement, said outlet arrangement being in fluidic communication with an associated hypodermic needle. The second pump chamber is adapted to transfer substance from a second reservoir to the outlet arrangement, wherein the first pump chamber is adapted to deliver the set dose of medicament during one or more pump strokes, the stroke volume(s) of said one or more pump strokes being variable.

Abstract: An infusion system, method and device for delivering therapeutic fluid to the body of a patient are disclosed. The device includes a dispensing unit having a peristaltic pump for dispensing therapeutic fluid to the body of the patient. The peristaltic pump includes a driving mechanism. The device further includes a monitoring mechanism (112, 114) for monitoring operation of the driving mechanism and dispensing of therapeutic fluid to the body of the patient.

Abstract: The invention relates to a single-use pumping casing (A) provided with an inlet duct (6), a discharge duct (7) and a alternating-movement pumping member (1a), a driving mechanism including a member (4) for driving the pumping member (1a) in at least one of the alternating movements thereof. The driving mechanism is housed in a holder housing (B) having a wall with a retaining rail (19) for engaging sliding members of the pumping casing (A), the housing further including a passage opening (21) for the driving member (4), an abutment means (20) for determining the position of the pumping casing (A) along the retaining rail (19) and for placing the pumping member (1a) into a drive relation with the driving member (4), and a removable attachment means (19, 20) for attaching said pumping casing (A) in said determined position along the retaining rail (19).

Abstract: This pump with a battery-powered drive device comprises a circular elastic diaphragm (1a) and two valves (2b, 10), which has a diameter of 3 to 25 mm and is subjected to a compressive prestress of between 1? 104 and 4? 104 Pa capable of enabling it to return to its rest position at a maximum working frequency of between 8 and 12 Hz with a travel of between 0.2 and 2 mm, corresponding to a maximum flow rate of 1.5 to 2.5 l/h. The drive device comprises an electromagnet (5) in direct contact with the diaphragm (1a), a standard power supply battery, the available energy of which is from 7000 to 10'000 J, means for analyzing the supply current for the electromagnet and for detecting, at each pumping drive cycle, a minimum defined intensity of the supply current corresponding to the closure of the gap of the electromagnet (5) and means for interrupting the supply current once this minimum intensity has been reached.

Abstract: A catheter having a drug delivery unit at the distal end thereof. The drug delivery unit includes an actuator capable of assuming an activated and an inactivated configuration. The drug delivery unit also includes a receptacle capable of accepting a therapeutic agent. The actuator and receptacle are in communication with each other such that the actuator transmits force to the receptacle and the receptacle accepts force from the actuator in an activated configuration of the actuator. Also provided is a method of delivering a therapeutic agent to a target site using the catheter of the present invention.

Abstract: The invention provides a pump assembly comprising an actuator lever, an actuator for moving the actuator lever, a supporting structure, a pump comprising a pump member moveable by actuation of the actuator lever, a first pivoting joint formed between the actuator lever and the supporting structure, and a second pivoting joint formed between the actuator and the supporting structure. The actuator lever and the actuator are coupled to each other by a coupling joint arranged between the first and the second pivoting joint in such a way that rotation of the actuator in a first direction causes the actuator lever to rotate in an opposite second direction. By providing an actuator system comprising two actuator elements linked to each other by a coupling joint ensuring counter rotation of the two members, a system is provided which can be made less susceptible to the influence of acceleration.

Abstract: A micropump, which in particular is a pump for a medicinal active substance and which may be an insulin pump or an analgesic pump, has at least one valve, which has a valve chamber, and has a pump chamber. At least one immobile structural element, which reduces the valve chamber volume, is provided in the valve chamber.

Abstract: A system for the metering and delivery of small discrete volumes of liquid is comprised of a small or minimal number of inexpensive components. One such component is a movable member, such as a miniature precision reciprocating displacement pump head, which is driven by an actuator that comprises a shape memory alloy material. The operating mechanism of the system is of little or minimal complexity. The system facilitates the precise metering and delivery of the small discrete volumes of liquid. Potential applications for the system include subcutaneous, long-term, automated drug delivery, for example, the delivery of insulin to a person with diabetes. In such an application, the small, simple and inexpensive nature of the invention would allow for its use as both a portable and a disposable system.

Abstract: A system for the metering and delivery of small discrete volumes of liquid is comprised of a small or minimal number of inexpensive components. One such component is a movable member, such as a miniature precision reciprocating displacement pump head, which is driven by an actuator that comprises a shape memory alloy material. The operating mechanism of the system is of little or minimal complexity. The system facilitates the precise metering and delivery of the small discrete volumes of liquid. Potential applications for the system include subcutaneous, long-term, automated drug delivery, for example, the delivery of insulin to a person with diabetes. In such an application, the small, simple and inexpensive nature of the invention would allow for its use as both a portable and a disposable system.

Abstract: A pump device, tube device and method for the aspiration, peristaltic movement and collection of fluid. A rigid tube for drawing fluid connected to a primary flexible tube. The primary flexible tube inserted through a peristaltic pump.

Abstract: A medical fluid machine includes a housing providing a first wall and a second wall, the first and second walls at least partially defining a pump chamber. A fluid receptacle is located within the pump chamber, the fluid receptacle including first and second flexible membranes configured to be moved apart to accept a medical fluid and moved together to dispel the fluid. A medical fluid outlet is in communication with the fluid receptacle. A first valve arrangement is configured to enable medical fluid in a sufficiently air-free condition to be delivered from the receptacle through the medical fluid outlet to a patient. A second valve arrangement is configured to enable medical fluid with entrained air to be delivered instead from the receptacle through the medical fluid outlet to an entrained air destination.

Abstract: A system and method for generating a gas-supersaturated fluid and delivering the fluid at high delivery pressures to thereby prevent bubble nucleation is disclosed. The system comprises a housing for containing a removable fluid assembly for housing a fluid to be gas-supersaturated and a drive assembly for delivering the fluid to a delivery site. The housing assembly comprises a cylinder and a piston which may be advanced along the inner surface of the cylinder to pressurize and to deliver the fluid. To generate a gas-supersaturated fluid, the housing assembly is removed from the system housing, filled with a fluid, and gas is introduced at or slightly above the desired gas partial pressure into the cylinder.

Abstract: An implantable infusion pump system is disclosed. The pump system preferably includes an implantable pump and a removable module. The module may provide for varying flow rates of fluid being dispensed from the pump or may provide for a constant flow rate of such fluid. In the case of varying flow rate capabilities, the module preferably includes one or more sensors to determine information relating to the flow rate, electronics for analyzing the flow rate information, and a mechanism for physically altering the flow rate. Methods of dispensing a medicament to a patient are also disclosed, as are variations of the pump system.

Abstract: A self-contained pump is disclosed that is an integrated pump. It has a reservoir, a pumping mechanism, and at least one outlet. The pumping mechanism is for controlled compression of the reservoir to force a required volume of fluid in the reservoir through the at least one outlet.

Abstract: A plurality of pump cassettes are connected through distribution tubing to a single inlet tube such that the inlet tube is shared by the pump cassettes through the distribution tubing. The plurality of pump cassettes may be symmetrically attached to the distribution tubing. A four-port coupling may be inserted in the distribution tubing for making connection to the inlet tube and a middle one of the pump cassettes when the number of cassettes is an odd number.

Abstract: A an infusion tube misfitting detection device for an infusion pump, which can be implemented at a low cost while maintaining safety. When a door unit is to be closed with respect to a pump body in a misloaded state of an infusion tube, a mislead detection inner door is pressed by the infusion tube to operate on a handle lock part provided to a handle. Accordingly, a claw portion of the handle lock part is pushed up, so that the door unit cannot be locked with the pump body 10 by inserting the claw portion into a rectangular through-hole 11c of a base plate. Therefore, the misloaded state can be identified.

Abstract: The invention relates generally to a peristaltic precision metering device, system and method of using the same. Disclosed is a metering device which includes a metering element that can engage with a compressible material line, wherein the metering device can place a selectable peristaltic effect upon the material in the line. Also disclosed is a metering system comprised of a metering device similar to above and a control system attached to the metering element and a robotic positioning system also attached to the metering device. Finally disclosed is a method of precision material dispensing comprised of providing a metering element and base, positioning a compressible material line between the metering element and base, moving one of the base, metering element, material line, or combination thereof, thereby causing a peristaltic effect upon material in the line, and dispensing a precise unit of material from the device.

Abstract: A pump module for use in a medical fluid dispensing system is provided that includes a pump body having first and second portions where at least one of the first and second portions includes first and second fluid chambers. The module further includes at least one membrane operably associated with the fluid chambers, and first and second actuators operably associated with this membrane for the purpose of displacing the membrane and further for displacing fluid from the first and second chambers.

Abstract: A medication infusion system may include a controller and a reservoir module including a reservoir containing medication to be delivered to an internal wound site via the controller. The controller may have a peristaltic pump driven by a motor to urge medication to flow toward the internal wound site, through a conduit. When the conduit is not tensioned via engagement with the pump, a valve blocks fluid flow to prevent unrestricted flow of medication. The valve may have a tapered plunger separated from an annular valve seat by a portion of the conduit that elongates under tension to enable withdrawal of the plunger from the valve seat. Alternatively, the valve may have features such as a spherical plunger between two annular valve seats, a rigid tubular member biased with respect to the conduit, or an opening in the conduit that moves axially or radially to enable fluid flow.

Abstract: The present invention is directed to a four function microsurgery instrument performing the functions of aspiration, irrigation, dilation and cauterization. An embodiment of the present invention has a body; a first and second side arms with integral dilation tips having an electrical conducting surface; a power control and transmission system; a common conduit that delivers irrigation-fluid and aspiration-suction in proximity to the dilation tips and an irrigation-fluid and aspiration-suction control and transmission system. The instrument provides the advantages of being small in size, being ergonomical, being all-in-one, eliminating the need for a surgeon-user to fumble around in switching between instruments, reducing time consumption and reducing frustration.

Abstract: An aspirator cassette includes a housing having first and second ends sealed off by first and second end caps, respectively. A partition mechanism is enclosed within the housing for dividing its internal volume into first and second regions. First and second fluid flow ports are mounted on the first and second end caps, respectively, to provide fluid flow paths into and from the first and second regions, respectively. When the first region is filled with liquid, its associated first port is connected to a vacuum source for sucking the liquid out of the region, whereby as the liquid is removed, the partition mechanism responds by decreasing the volume of the first region, and increasing the volume of the second region causing its second port to draw a vacuum for sucking fluid from an aspiration device connected to the second port.

Abstract: A system and method for mixing and delivering fluids such as contrast media and saline is disclosed including at least two fluid sources, a pump, a joining fluid path connecting the at least two fluid sources to an inlet to the pump, and a valve device in the fluid path upstream of the pump. The valve device includes an actuator adapted to restrict flow in at least one of respective fluid lines connecting the at least two fluid sources to the pump inlet. A patient interface device may be associated with an outlet of the pump. The valve device actuator is generally adapted to restrict the flow in at least one of the respective fluid lines such that an incremental positional change in valve device actuator position provides a substantially linear change in fluid mixture ratio of the fluids from the at least two fluid sources to the pump inlet.

Abstract: The invention relates to micropumps for infusing fluids. More specifically, the present disclosure describes and illustrates a micropump design that may be useful for infusing insulin into a diabetic patient. The disclosed design employs a pump chamber that has a diaphragm and a plurality of check valves that are configured to avoid leakage from the reservoir through the pump engine and into an infusion device and, also, to ensure the complete, accurate evacuation of the pump chamber.

Abstract: The invention relates to a roller pump which comprises an abutment (31, 52), at least one roller (51) and a casing (2, 3, 6). A pump hose (42) is squeezed between the roller (51) and the abutment (31, 52). A hinge (5) connects the abutment (31, 52) and the casing (2, 3, 6) pivotably, the axis of the hinge (5) being parallel to the plane of the pump hose (42). The invention further relates to a roller pump which comprises a resilient roll member (52) which is fixed to the abutment (31, 52). The pump hose (42) is pressed against the resilient roll member (52). The invention additionally relates to a roller pump which comprises two roller gears (37; 162). Each roller gear being torque-proof connected to one of the two rollers (51; 169). The two roller gears (37; 162) engage with another gear (33; 161, 160) for ensuring zero relative velocity of the portion of the rollers (35; 142) squeezing the pump hose (42) with respect to the squeezed portions of the pump hose (42).

Abstract: A medical fluid machine includes a housing providing a first wall and a second wall, the first and second walls at least partially defining a pump chamber. A fluid receptacle is located within the pump chamber, the fluid receptacle including first and second flexible membranes configured to be moved apart to accept a medical fluid and moved together to dispel the fluid. A medical fluid outlet is in communication with the fluid receptacle. A first valve arrangement is configured to enable medical fluid in a sufficiently air-free condition to be delivered from the receptacle through the medical fluid outlet to a patient. A second valve arrangement is configured to enable medical fluid with entrained air to be delivered instead from the receptacle through the medical fluid outlet to an entrained air destination.

Abstract: A compact fluid dispenser for use in controllably dispensing fluid medicaments, such as, antibiotics, analgesics, and like medicinal agents from the device reservoir. The fluid dispenser includes a unique stored energy mechanism which takes the form of a constant force spring member of novel design that provides the force necessary to continuously and substantially uniformly expel fluid from the device reservoir. The device also includes novel adjustable flow rate control assembly that is disposed intermediate the fluid reservoir outlet and the outlet port of the device for precisely controlling the rate of fluid flow from the outlet port toward the patient.

Abstract: A peristaltic pump 10 for use in ophthalmic surgery includes a housing 12, a pump head 14 having plurality of rollers 16 held within the housing 12, and a backing plate 18 attached to the housing 12. The pump head 14 moves relative to the housing 12 and backing plate 18.

Abstract: A cassette having a molded flow channel contained on an elastomeric sheet that is bonded or mechanically attached to a rigid substrate. The flow channel projects outwardly from the exterior of the cassette so that a peristaltic pump having pump head rollers mounted radially from the axis of rotation of the pump motor compress the elastomeric flow channels against the rigid substrate during operation.

Abstract: A flow set for administration of liquid when using a liquid pump is disclosed. The flow set of the present invention permits identification of the flow set by a liquid pump that uses this flow set and prevention of pumping tube-segment over stretching.

Abstract: A tube for a peristaltic pump comprises an elastically deformable tubular body (2) made from a PVC composition containing: 100 phr of a PVC resin having a K value, measured according to standard ISO 1628-2, of not less than 85, from 40 to 100 phr of DEHA plasticizer, from 0.05 to 1.0 phr of lubricant, from 0.3 to 15.0 phr of stabilizer and co-stabilizer. The deformable tube, which is usefully employed for liquid transport in a dialysis apparatus, enables a high level of fluid transport efficiency to be maintained, even after many hours of peristaltic pump operation.

Abstract: A pump used to infuse a fluid into a patient is controlled in accordance with an algorithm that enables a microprocessor to monitor and adjust each pump cycle to compensate for a differential pressure between the pump's inlet and outlet. The algorithm defines a fluid delivery protocol that is applied in controlling the operation of the pump to achieve a desired rate, volume, and timing of the fluid infusion. Fluid is delivered by the pump when a plunger compresses an elastomeric membrane overlying a fluid chamber. Due to the small volume of the chamber, an incremental change in the plunger position before the delivery stroke produces a significant change in the delivery pressure. At the beginning of a pump cycle, the microprocessor determines the differential pressure between the inlet and outlet of the pump, and adjusts the plunger position before the delivery stroke to compensate for the differential pressure.

Abstract: A cassette having a molded flow channel contained on an elastomeric sheet that is bonded or mechanically attached to a rigid substrate. The flow channel projects outwardly from the exterior of the cassette so that a peristaltic pump having pump head rollers mounted radially from the axis of rotation of the pump motor compress the elastomeric flow channels against the rigid substrate during operation.

Abstract: The present invention is generally directed to improved methods, devices, and systems for eye surgery. In some embodiments, the invention may provide new and/or improved devices, systems, and methods for detecting surgical fluids in a fluidics cassette, particularly cassettes which are used to couple an eye treatment probe to an eye treatment console. Rather than relaying on internal reflection by a gas-liquid interface, the fluid detection techniques described herein may make use of the changes in propagation of light through a portion of the holding tank when the portion varies between empty and full. For example, light may propagate directly through the holding tank portion when there is no surgical fluid, but may be directed away from a light detector when the portion of the holding tank is filled with surgical fluid.

Abstract: A wearable infusion device delivers a liquid medicant, such as insulin, to a patient. The infusion device comprises a base that contacts a patient's skin and a reservoir arranged to contain a liquid medicant to be delivered beneath a patient's skin. The reservoir has an outlet through which the medicant flows. The infusion device further includes a flexible conduit communicating with the outlet of the reservoir and a pump that causes the medicant to flow down the conduit.

Abstract: A medical pump, for use with a cassette having a pumping chamber, includes a pumping element with a piston slider assembly which intermittently pressurizes the pumping chamber during a pumping cycle and has a piston head connected to a main body with a single pressure sensor positioned therebetween. A camshaft is associated with the pumping element, an inlet control element, and an outlet control element for closing the pumping chamber to flow when the pumping chamber is pressurized. A processing unit receives pressure and position data from the pressure sensor and a position sensor associated with the pumping element, and processes this data to determine the operating condition of the pump. The operating conditions determined include: blocked fluid flow, no fluid in the line, no cassette associated with the pump, proper pump priming, or proper valve sealing.

Abstract: A fluid delivery system includes a source of an injection fluid including a source outlet. The system also includes a control system including a control system inlet in fluid connection with the source outlet, a control system outlet and, alternatively, an actuator. The control system is adapted to deliver a predetermined amount of fluid via the control system outlet upon activation of the actuator or modification of the control system. In several embodiments, the injection fluid in the source is pressurized. The source can, for example, include a plunger slidably disposed therein and a force application mechanism to place force upon the plunger and pressurize the fluid within the source. The control system can further include a metering volume in fluid connection with a valve system. The metering volume can include a plunger slidably disposed therein.

Abstract: An improved ambulatory infusion device for dispensing a fluid into a patient includes a flexible bladder enclosure including a sheath of flexible material having a first open end a closed second end. The first open end of the sheath is affixed to a rigid closure, and a bladder support is secured in fixed position relative to the closure. An elastic bladder is mounted on the bladder support and positioned inside the sheath for holding fluid to be dispensed. The closed second end of the sheath is free to conform to the body of the patient so that the device is comfortable when worn. In other aspects, a flow restrictor and a pressure regulator are provided.

Abstract: A system and method is disclosed for controlling the input electrical current to an infusion pump stepper motor based on predetermined torque requirements. The system can include a motor controller and a non-volatile memory containing expected load torque values throughout a pump cycle. Responsive to the expected load torque values, the motor controller provides the stepper motor with a varying electrical current for overcoming load torque at each point in the pumping cycle. Additional factors can also be considered for varying the electrical current. These factors include, but are not limited to, temperature, pressure, and elapsed operating time.

Abstract: A disposable cartridge for use in extracorporeal blood perfusions systems that have a control unit for controlling the flow of fluids. The cartridge has a housing defining a plurality of internal passageways that connect to a cardiopulmonary circuit, a cardioplegia circuit and a suction circuit. The cartridge may be fitted with one or more of a bubble trap, a filter, and a valve.

Abstract: A peristaltic pump tubing system for use with a peristaltic pump roller assembly in a surgical procedure. The system comprises a uniquely shaped disposable cassette for retaining tubing to be used during the procedure and a uniquely shaped cassette receiving station situated adjacent the roller assembly. The cassette comprises a frame for holding the tube in a loop shape for engagement with the peristaltic rollers. The frame supports a one-sided pressure transducer to indicate the pressure within the tube. The cassette receiving station includes a sensor for engaging the one-sided pressure transducer and is situated adjacent the rollers of the peristaltic pump on the pump housing. A retaining bracket cooperates with the inherent resiliency of the tubing loop to hold the tubing in place against the rollers.

Abstract: A peristaltic pump 10 for use in ophthalmic surgery includes a housing 12, a pump head 14 having plurality of rollers 16, a backing plate 18 attached to the housing 12, and a length of surgical tubing 50. The rollers 16 and backing plate 18 cooperate to pinch the length of surgical tubing 50 to peristaltically pump fluids from a surgical site to a collection bag 64. At least one of the pump head 14 and the backing plate 18 is moveable, during operation of the pump 10, from a tubing pinched position to a tubing vent position. This movement allows the tubing 50 to be vented by removing the pinched closure of the tubing 50.