Abstract: A peristaltic roller pump includes a rotor carrying a pumping roller on one end and an occluding roller on the other end. Occluding roller has a number of protrusions designed to only occlude the tubing section that is located under that roller as it moves over it in order to prevent any back flow through that section of the tube. Occluding roller is designed to not cause any pumping of fluid through the section of the tubing under that roller. Such design is useful in a single-needle dialysis system and in other alternating pumping systems in which during a first phase of the pumping the fluid is moved in one direction and during the second phase of operation the fluid is moved in the opposite direction.

Abstract: A portable pumping apparatus for concurrently pumping liquid from a source container to a destination container and pumping vapor from the destination container to the source container comprises a liquid and vapor pump having a liquid inlet, a liquid outlet, a vapor inlet and a vapor outlet. There is a selectively controllable actuation mechanism for actuating the liquid and vapor pump to thereby concurrently pump liquid from the liquid and vapor pump through the liquid outlet and vapor into the liquid and vapor pump through the vapor inlet, and concurrently pump vapor from the liquid and vapor pump through the vapor outlet and liquid into the liquid and vapor pump through the liquid inlet.

Abstract: A peristaltic pump is presented comprising a housing and a rotor assembly supported by the housing. An occlusion bed is slideably mounted in the housing. A door is pivotable about a shaft, which is supported by the housing. A pinion gear is coupled to the shaft and engages a rack on the occlusion bed. Rotation of the shaft causes the occlusion bed to slide toward or away from the rotor assembly. An open portion of a tube retaining system is associated with the housing and a clamping portion of the tube retaining system is associated with the door. The open portion and the clamping portion of the tube retaining system are configured to secure flexible tubing therebetween when the door is in a closed position.

Abstract: An infusion device comprises a pusher for a plunger of a syringe containing a liquid to be infused. A load cell measures the push force. An encoder associated to a motor commanding the pusher measures the displacement of the pusher. A controller signals an alarm when the ratio between the variation of the push force and the displacement exceeds a predetermined threshold. The device, which serves for infusing an anticoagulant into an extracorporeal blood circuit in a dialysis apparatus, is able to signal an onset of an anomalous situation of lack of infusion in good time.

Abstract: A peristaltic pump assembly includes a pump body and a cassette removably attached thereto, wherein the cassette includes a race configured to provide a compression surface for a tube supported by the cassette. A roller assembly is operatively connected to the pump body, wherein the roller assembly includes a plurality of rollers configured to apply a predetermined force to the tube, thereby compressing the tube against the race. The peristaltic pump assembly further includes a regulator disposed in the pump body and operatively connected to the cassette, where the regulator is configured to regulate the predetermined force applied to the tube.

Abstract: The invention relates to a disposable cartridge usable for a blood treatment apparatus provided with at least one frontal access pump; the cartridge consists of at least one duct portion whose structure and position, by approaching the disposable cartridge to the apparatus, determine the association of said duct portion with said pump, so as to complete the apparatus in order to use it.

Abstract: The invention relates to a method and to a device for operating an electric peristaltic hose pump, in particular a hose pump for transporting fluids in medical-technical devices, in particular extracorporeal blood treatment devices. In order to monitor the regular operation of a hose pump, the power consumption of the pump or a physical variable in correlation with the power consumption, in particular the pump flow, is monitored. The pump flow includes a periodically non-altering direct component which is superimposed on a periodically altering alternating component. In order to monitor the regular operation of the hose pump, the alternating component of the power consumption in relation to the direct component of the power consumption is monitored as whether it increases and/or decreases during blood treatment.

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 liquid transfer device that includes: a plurality of reservers that each store therein a liquid; a plurality of elastic tubes that are linked to the reservers and retained by a tube guide; a rotation axis that is retained to be able to rotate; and a tube depressing member whose depressing section is fixed to the rotation axis for depressing the tubes with a helical-structured convex portion provided thereto. In the liquid transfer device, when the rotation axis rotates, the liquid starts to flow by the depressing section sequentially depressing the tubes in a direction from the reservers toward a flow-out side of the liquid.

Abstract: A tubing holding device for a roller pump is disclosed. The tubing holding device is removable from the roller pump, slidably moveable and able to be opened to allow for easy exchange of tubing in roller pumps. The tubing holding device comprises a clamping mechanism that securely holds tubing in place. Tubing of various sizes may be used within a roller pump by selecting the appropriately sized tubing holding device, or by using a tubing holding device, such as one embodiment disclosed, which may be adjustable for different sizes of tubing. Roller pumps including the tubing holding devices, and methods of loading such roller pumps are also disclosed.

Abstract: A waste evacuator device (10) for evacuating waste products from bodily orifices, including stomas and artificial stomas created as a result of a surgical procedure such as a colostomy is disclosed. The device comprises a chamber (11) having an inlet (14) which is fluidly communicable with an orifice formed in a mammalian body. An irrigation member (12) is provided for introducing irrigating fluid into the orifice. A suctioning device (13) connectable to the chamber to create a region of reduced pressure within the chamber. An irrigation and evacuation control means for the device is provided for receiving signals generated by at least one sensor, the signals being representative of at least the performance of the irrigation member and of the suctioning device.

Abstract: The present invention relates to a pump unit or the like which feeds particles in a liquid with particles dispersed therein to a predetermined area. An object of the present invention is to obtain a sufficient solution feeding resolution while inhibiting mixture of bubbles. The pump unit includes a moving mechanism 13 that moves a pump 12 and a reservoir 11 relative to each other to vary the positional relationship between a tip 1221 of the pump 12 and an edge 112 of the opening 111 between a separating relationship in which the tip 1221 is separated upward from the edge 112 of the opening 111 in a liquid reserved in the reservoir 11 and a pressing relationship in which the tip 1221 is pressed against the edge 112. In the separating positional relationship, the pump 12 performs a sucking operation to take particles C into its interior. In the pressing relationship, the pump 12 performs an ejecting operation to deliver the particles C.

Abstract: An infiltration apparatus, having a cannula, a flexible tubing connecting to one end of the cannula, a peristaltic pump comprising a pathway for the flexible tubing to extend through and a plurality of non-conductive rollers installed along the pathway to exerting force on the flexible tubing, a container in fluid communication with the cannula via the flexible tubing extending through the peristaltic pump, a foot pedal pneumatically connected to the peristaltic pump to control operation thereof. The response of the foot pedal can be programmed into various modes. Under one of the modes, when the foot pedal is depressed, the peristaltic pump is switched on and remains as long as the foot pedal is depressed. Once the foot pedal is released, the peristaltic pump is switched off. Under another mode, one depression event, regardless how long the depression event lasts, the peristaltic pump is switched from on to off, or from off to on, and remains off/on before a next depression event occurs.

Abstract: A micropump of a peristaltic type that continuously transfers a fluid through depression of an elastic tube is disclosed. The micropump includes: a tube unit configured to at least include the tube, a tube guide frame that fixedly holds the tube, and a tube individual data storage section that stores therein tube individual data; a control unit that is attachable/detachable to/from the tube unit, and at least includes a control circuit section that drives and controls, via a transmission mechanism section, a motor for driving a depression mechanism section serving to depress the tube, and a tube individual data processing section that reads the tube individual data for data processing thereof; a power supply that makes an electrical supply to the control unit; and a reader/writer unit that detects attachment of the tube unit to the control unit, and reads the tube individual data for writing to the control unit. In the micropump, the tube individual data is used as a basis for driving.

Abstract: Peristaltic pump comprising—a pump body (3) with a face containing at least a first groove (4) covered by a flexible membrane (2) fixed to said pump body (3), in such a way as to form a fluid tight channel, said membrane (2) furthermore comprising a sealing ridge (19) which is in permanent contact against said groove (4) so as to obtain a resting fluid tight sealing segment in the channel, —a movable pressure element (7) adapted to temporarily press a portion of the membrane (2) above said groove (4) and form a moving sealing segment in the channel, —driving means (8) adapted to move said movable pressure element (7) along said groove, said driving means (8) furthermore being adapted to move said movable pressure element (7) exclusively along a plane which is parallel to said pump body face, said sealing ridge (19) and/or said groove (4) being adapted to let said movable pressure element (7) in said parallel plane when moving over said sealing ridge (19), characterized by the fact that the movable pressure el

Abstract: The apparatus comprises a displacement pump with at least one flow vessel, with a pump drive, and with a support means for holding the flow vessel. Furthermore, the apparatus comprises a measuring arrangement responsive to the displacement motions performed by the flow vessel, wherein the displacement motions are picked up by a pressure sensor diposed at the flow vessel or by a strain sensor disposed at the support means. The measuring arrangement serves to sense an actual displacement motion of the flow vessel robustly and reliably, and to deliver a measurement signal representative of this motion. The signal is particularly suited for generating a flow rate estimate representative of the instantaneous volume flow rate and/or for generating a status signal signaling a current operational status. Further, a method is disclosed which supplies information serving to monitor such an apparatus. The apparatus is suitable for using in a sampler.

Abstract: A flexible tube has a first portion and a second portion located close to each other in the vicinity of an opening of an accommodating case. A pressing member moves from the first portion to the second portion along the tube while pressing a portion of the tube. An auxiliary member is provided in the vicinity of the opening of the case. The auxiliary member has an auxiliary surface. When the pressing member passes the vicinity of the opening of the case, the auxiliary member transfers the pressing member from the second portion to the first portion via the auxiliary surface. This structure ensures a silent operation of the tube pump.

Abstract: A peristaltic depositing machine includes a hopper to store viscous material. A flexibly deformable tubing section is connected to the hopper for receiving the viscous material. A pair of rollers cooperate to compress tubing section and thereafter move forwardly along the tubing section such that the viscous material is forwardly propagated. A manifold is connected between the hopper and the tubing section to transmit the viscous material there between. A flow control unit is connected to a portion of the tubing section forward of the pair of rollers. The flow control unit alternately constricts and unconstricts the portion of the tubing section in synchronism with the forward movement by the pair of rollers. A nozzle is connected to an output end of said tubing section to shape the viscous material upon output. A carriage is also connected to an output end of the tubing section and moves about a predetermined travel path to thereby direct an output location of the viscous material.

Abstract: A peristaltic pump is disclosed having pump motor with a rotating motor shaft and a shaft axis; a peristaltic pump head rotatably mounted on the motor shaft; a raceway having a semi-circular track arranged around the pump head and coaxial with the shaft axis, wherein the track has a beveled edge at an entrance to the raceway to receive a tube loop being loaded into the pump; the pump head includes at least one roller orbiting the raceway and compressing the tube loop against said raceway, and a cartridge to which the tube loop is attached and mountable on the raceway.

Abstract: An actuating device for hydraulically securing a camshaft of an engine of a motor vehicle in a start position has a solenoid valve controlling the flow of a pressure medium to a camshaft adjuster with a rotary slide valve that is fixedly connected to the camshaft and moves the camshaft into the required start position according to the pressure medium supplied to it by the solenoid valve.

Abstract: A liquid rationing device comprises a base and a cover. The base is provided with an actuating element whose axle goes through the base. The axle is connected with a gear disk, which is provided with more than one roller on one side thereof. The cover is coupled to one side of the base and has a reservoir provided with a transmission hose with positioning extrusion. A positioning groove is provided on the reservoir such that the positioning extrusion of the transmission hose can be held therein and the transmission hose can surround the circle of the rollers. Accordingly, the actuating element can drive the gear disk and make the rollers on the gear disk to rotate and subsequently push and squeeze the transmission hose, thereby making displacement of the liquid in the transmission hose and obtaining the purposes of rationing.

Abstract: A piston pump propels liquid through a lumen of a flexible tube segment. The pump includes a first tube clamping member, a first set of tube squeezing members, a second tube clamping member, a second set of tube squeezing members and a synchronizing arrangement for activating the members in a sequential order such that fluid in the tube is displaced in a downstream direction.

Abstract: The invention provides a variable speed hydraulic pump designed to operate at a maximum horsepower throughout its pressure range by adjusting motor speed according to motor load parameters. In particular, the variable speed hydraulic pump includes a hydraulic pump unit coupled to a variable speed electric motor by a drive unit and to a hydraulic fluid tank for pressurizing and pumping hydraulic fluid when operated by the motor. A motor controller is electrically connected to the motor to supply drive signals to the motor based on electrical characteristics of the drive signals which are dependent on the load exerted on the motor. Suction from the load is provided by both the main pump and a bidirectional supercharging pump by reversing the direction of the motor and shifting a 4/3 valve to connect the main pump inlet to the load and its outlet to tank.

Abstract: A peristaltic pump mechanism comprises a base plate (11) having a generally planar surface for supporting a pump tube (12) to extend at least partially around a circular path defined on said surface, an operating section (10) connectable to the base member (11). At least one rotatable pumping element (21) is mounted on the operating section (10) locally to compress the pump tube (12) and roll around the circular path when the operating section (10) is connected to the base member. A power drive causes the pumping element (21) to roll around the circular path, the pumping element (21) being of conical shape and mounted on the operating section (10) so that the axis of the element is substantially co-incident with the centre of the circular path. In this way essentially no slippage takes place between the pumping element and the base plate.

Abstract: Various kinds of fluid can be handled and delivered accurately in infinitesimal amounts through microchannels formed in an elastic polymeric substrate by periodically squeezing selective portions of the microchannel using a rotor to apply an external force on the elastic substrate. The delivery rate of the fluid is in the range from pL/sec to mL/sec determined by the rotation speed of the rotor which presses the microchannels and the dimensions of the microchannel. Regardless of physical properties of the fluid to be delivered, various kinds of fluids can be accurately delivered through the microchannels in the desired amount.

Abstract: A tube pump, includes a tube, a tube pump body including a roller, and rotating the roller for depressing to flatten the tube, and a pump holder, having substantially a cylindrical shape, and containing the tube pump body and the tube therein. The tube has a curve portion, an upstream side portion extended upstream from the curve portion, and a downstream side portion extended downstream from the curve portion. The tube is drawn out so as to overlap the upstream side portion and the downstream side portion being parallel each other. Also, a second tube pump includes a tube, a casing containing a flow path middle portion of the tube, and a pressing member pressing the flow path middle portion against an inner wall of the casing. The pressing member includes a contact member facing to the casing through the tube and an urging member urging the contact member to the tube by an elastic force.

Abstract: A tube type pumping apparatus having a resilient tube provided along a wall, a squeezing member positioned to move along the wall to squeeze the resilient tube against the wall, a squeezing member holder that holds the squeezing member; a cam member whose surface receives a driving force from a driving source to change positions of the squeezing member between an initial position away from the wall and a squeezing position near the wall, and a regulating force generator that provides a regulating force to the squeezing member at a transition time interval as the squeezing member moves from the initial position to the squeezing position. The regulating force generator and the cam member acting together to prevent the squeezing member from applying pressure against the resilient tube during the transition time interval. The squeezing member has a curved surface to maintain an alignment of the tube with the squeezing member.

Abstract: A displacement pump comprising a pump assembly and a cassette assembly. The pump assembly includes upper and lower housing portions that define a cavity, an arm disposed in the cavity, a roller attached to the distal end of the arm, and a motor attached to the proximal end of the arm for rotating the arm. The cassette assembly is removably disposed in the cavity and comprises upper and lower cassette housing portions that form an annular compression surface with a channel therein. A hollow compression tube having a flange extending along a length thereof is secured to the compression surface by the flange being engaged with the channel. As the motor rotates the roller arm, the roller presses the compression tube against the compression surface to create a moving occlusion of the compression tube for pushing fluid through the compression tube.

Abstract: An infusion pump has a housing (10) accommodating a pump finger mechanism (12). The pump finger mechanism (12) acts on a pump hose (13) fastened at holders (16, 21) of the housing. The pump hose (13) is supported by a door (24). In order to facilitate proper and positionally correct placement of the pump hose, one of the holders (16) includes an oblique pin. The associated transition piece (15) of the pump hose (13) has a hole (18) with the same inclination angle as the oblique pin. The other transition piece (20) is of a different structure so that the transition pieces cannot be mixed up. A longitudinal color strip (29) on the pump hose is provided to visually indicate any twisting of the hose.

Abstract: The pressure rollers of a peristaltic tube positive displacement pump are incorporated as an element of a reduction system connecting a drive shaft to the rollers.

Abstract: The invention relates to a peristaltic pump (6) for pumping viscous media, and comprises a housing (6A, 6B) having a wall (12) against which a hose (25) is placed, a shaft (7) that is centrally positioned in the housing and that carries a roller arm (13) having a roller (14) adapted to roll against and at the same time locally compress the hose (25) against the wall (12). According to the invention a guide path (35) for the hose and impregnated with lubricant is arranged in the housing of the pump. The invention also concerns an application of such a pump, a guide path for use in such a pump and a method of performing lubrication therein.

Abstract: An enclosure for a medical pumping device generally comprises a front shell, a back shell and a polymeric substrate interposed therewith. The polymeric substrate comprises at least one gasket seat corresponding to the perimetric edge of each shell. In use, various components are securely placed within the plurality of component compartments within the polymeric substrate and thereafter encased within the enclosure between the front shell and back shell. According to the preferred embodiment of the present invention, the polymeric substrate also serves to form bumpers about the edges of the enclosure when the shells and substrate are assembled together.

Abstract: An infusion device with a disposable administration set which is inexpensive to manufacture. In the preferred embodiment of the present invention the disposable administration set has a plurality of elongated cam followers connected to a plate assembly, wherein the cam followers are displaced in a predetermined sequence and forced against a delivery tube by cam means driven by rotary drive means. The disposable administration set is injection molded as a single integral piece. The disposable administration set includes adjustment spacers disposed between the plate assembly and the cam followers which adjust the distance between them to keep the device accurate. In the preferred embodiment of the present invention the cam means are configured to provide fluid delivery at a consistent and uniform rate.

Abstract: Various kinds of fluid can be handled and delivered accurately in infinitesimal amounts through microchannels formed in an elastic polymeric substrate by periodically squeezing selective portions of the microchannel using a rotor to apply an external force on the elastic substrate. The delivery rate of the fluid is in the range from pL/sec to mL/sec determined by the rotation speed of the rotor which presses the microchannels and the dimensions of the microchannel. Regardless of physical properties of the fluid to be delivered, various kinds of fluids can be accurately delivered through the microchannels in the desired amount.

Abstract: An improved roller for peristaltic pumps includes a central portion and a plurality of projections extending radially outwardly from the central portion. The projections enable use of a roller having a larger diameter, while ensuring that the tube carrying the solution is effectively pinched off. The larger diameter roller provides a greater moment arm and decreases current draw. The small projections used to accomplish the seal also severely deforms a smaller amount of tubing and thus requires less current draw.

Abstract: A roller pump comprises a pump housing having a cylindrical inner surface, a rotor fixed to a drive shaft placed at the central portion of the pump housing, rollers provided around the rotor and a driver for driving the drive shaft through a reduction gear. The rollers press an elastic tube installed between the rollers and the inner surface of the pump housing to transfer a liquid in the elastic tube by rotation of the rotor. The pump housing and the reduction gear are integrated into one body and an output shaft of the reduction gear is fixed to the drive shaft of the rotor. A stepping motor is used as the driver. A part of the inner surface of the pump housing is composed of a semicircle, another part of the inner surface is composed of a partial circle of which center is shifted from the center of the semicircle.

Abstract: A piston pump propels liquid through a lumen of a flexible tube segment. The pump includes a first tube clamping member, a first set of tube squeezing members, a second tube clamping member, a second set of tube squeezing members and a synchronizing arrangement for activating the members in a sequential order such that fluid in the tube is displaced in a downstream direction.

Abstract: An infusion device with a disposable administration set which is inexpensive to manufacture. In the preferred embodiment of the present invention the disposable administration set has a plurality of elongated cam followers connected to a plate assembly, wherein the cam followers are displaced in a predetermined sequence and forced against a delivery tube by cam means driven by rotary drive means. The disposable administration set is injection molded as a single integral piece. The disposable administration set includes adjustment spacers disposed between the plate assembly and the cam followers which adjust the distance between them to keep the device accurate. In the preferred embodiment of the present invention the cam means are configured to provide fluid delivery at a consistent and uniform rate.

Abstract: A linearized peristaltic pump has a substantially circular elastomeric tube (30) clamped within a pump housing (1) and a plurality of tube-engaging rollers (40) adapted to compress the tube (30) to pump fluid from an inlet end (33) to an outlet end (34). The tube (30) is clamped longitudinally by a circlip (35) so as to have a flattened clamped part (31) and a bulbous unclamped part (32) which is engaged by the rollers (40). The rollers (40) are mounted on the outer ends of spring-loaded rotor arms (42) and move on a cam track (50) to alter the compression of the tube (30) progressively in a tube-encountering sector (E-B) and a tube-releasing sector (C-A).

Abstract: A pump 15 disposed in an ink-jet recording device has flexible tube 103 and guide member 106 whereon a prescribed part of the tube is mounted. Roller 105, of which there is at least one and which pressurizes and deforms tube 103, is supported by lever 107 such that it pressurizes the tube when it rotates in the forward direction and releases the pressure on the tube when it rotates in the reverse direction. This lever 107 is urged by spring 108 in the direction that presses the roller against the tube.

Abstract: A rotary peristaltic pump that can supply fluids accurately at desired flow rates and with the desired control over pulsations normally experienced when using peristaltic pumps. The control is provided, in one aspect, by varying the radius of the shell against which the compression devices act to deform the tubing. In another aspect, the torque needed to turn the rotor is equalized throughout the rotation of the rotor to further enhance the flow rate accuracy of the pump. Torque equalization is preferably enhanced by use of a torque control cam positioned about the rotor.

Abstract: A pump 15 disposed in an ink-jet recording device has flexible tube 103 and guide member 106 whereon a prescribed part of the tube is mounted. Roller 105, of which there is at least one and which pressurizes and deforms tube 103, is supported by lever 107 such that it pressurizes the tube when it rotates in the forward direction and releases the pressure on the tube when it rotates in the reverse direction. This lever 107 is urged by spring 108 in the direction that presses the roller against the tube.

Abstract: A tube-pump of the invention comprising; an elastic-tube disposed in a ring-shaped form along the inner surface of a cylindrical chamber, a ring-shaped pressure member driven by an eccentric cam device disposed within said ring-shaped elastic tube which is pressed by the circular motion of said ring-shaped pressure member, and plural supporting means allowing a pressing motion to said elastic tube and preventing continuous rotating motions of said pressing member in a same direction holding said pressure member in said cylindrical chamber by said plural supporting means. By employing this pump construction, elongation of elastic tube and changes of its inner diameter possible by continuous rotations of ring-shaped pressure members into the same direction can be prevented, and at the same time, the pump output capacity can be kept at constant without damaging said elastic tube, remarkably improving the pump durability.

Abstract: In a tube type roller pump having a stator, an elastic tube to which two tube connectors are fixed at a predetermined interval, and a drawing roller, movement of the tube connectors is regulated by a regulating portion disposed on a main body that constitutes the stator. The tube type roller pump prevents separation and expansion of the elastic tube from the stator, and thus is small in discharge error.

Abstract: A liquid feeding apparatus quantitatively feeds a liquid by pressing and clogging an elastic tube between a press roller and an arc-shaped guide portion through rotational motion of the press roller. The liquid feeding apparatus includes a main unit in which the press roller is provided, and a liquid cassette which accommodates a liquid cartridge. One end of the elastic tube is connected to a reservoir for the liquid to be fed, and the other end is connected to a check valve. The liquid cassette is removably fitted to the liquid feeding apparatus so that the elastic tube is subject to pressing action of the press roller.

Abstract: The present invention is a disposable combination of tubing components for use with the roller pump that limits the negative pressure said pump generates (e.g. during left ventricular venting). The device consists of pump tubing and a shunt with resistance to flow placed between the inlet and outlet of the pump tubing. The device may also incorporate interconnecting tubing and a one way valve at the pump inlet tubing. The valve decreases the likelihood of pumping air or fluid into the ventricle with accidental pump reversal. In one preferred embodiment the device is called the Better-Ventera. The pump tubing of the device collapses more readily than tubing currently being used for either venting or suction applications, thus limiting the negative pressure generated by the pump to safer levels. In addition, the maximum suction generated by the pump is further limited by recirculation of flow between the pump inlet and outlet. The recirculation acts to "break" high suction.

Abstract: A drive shaft for at least a rotating roller wherein the external portion of said drive shaft has surfaces treated by projection of particles to impart to it a controlled roughness designed to enable slip-free non-gear-like tooth drive of the roller by the shaft.

Abstract: The position of a rotating pump element is sensed by a reflective object sensor 406 in association with a view disk 412 coupled to the operative element for rotation in synchrony with the operative element. The view disk 412 has first 422 and second 420 surface portions that present themselves in succession to the reflective object sensor during rotation of the operative element. The first surface portion 422 is spaced at or near the optical focus of the reflective object sensor, whereas the second surface portion 422 is not. The reflective object sensor 406 thus generates different outputs, depending upon whether the first surface or second surface portions are in optical alignment with the reflective object sensor.

Abstract: A sliding flow controller for controlling flow through a pumping segment used in a fluid delivery system. The flow controller includes a slider that travels along a channel defined by an elastomeric membrane and a variable size groove formed in a rigid component. The slider includes a projecting ball that presses the membrane against the groove. At one end the groove has a maximum cross-sectional area for a maximum flow position and at another end, the groove has no cross-sectional area for a flow stop position. The slider and the pumping segment have respective click stops to impart sensory feedback to the operator when manually operated. A ramped thumb indentation is provided on the exterior of the slider to facilitate sliding movement.

Abstract: A pumping apparatus 10 for dispensing multiple component fluid material. The apparatus 10 includes at least first and second flexible tubes. The tubes each have an inlet and an outlet, and each of the inlets is supplied with a different component of the fluid material. A roller or rollers are provided for pressurized engagement with the tubes. The stop plate is engaged with the tubes at a location opposing the pressurized engagement of the roller. A driver mechanism independently moves the roller in pressurized engagement with the tubes, opposed by the stop plate, in a linear direction. Such linear movement carries the desired and variable amounts of fluid material to the tube outlets. An engagement frame supports the tubes, roller, stop plate and driver mechanism. A mixing reservoir is provided having multiple inlets, each of which is engaged with a flexible tube outlet, and a single outlet, such that the fluid material components are combined within the mixing reservoir and provided to the single outlet.