Source: http://www.google.com/patents/US5980490?dq=7,446,777
Timestamp: 2016-06-26 21:42:52
Document Index: 163299505

Matched Legal Cases: ['art 19', 'art 18', 'art 18', 'art 19', 'art 19', 'art 19']

Patent US5980490 - Linear peristaltic pump - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsThe invention relates to linear peristaltic pump of known contruction, in which a first cam (30a) and a first cam follower (11a) in the form of an input valve, at least three intermediate cams (30b-30e) and cam followers (11b-11e) for pumping operation and a last cam (30f) and a last cam follower (11f)...http://www.google.com/patents/US5980490?utm_source=gb-gplus-sharePatent US5980490 - Linear peristaltic pumpAdvanced Patent SearchPublication numberUS5980490 APublication typeGrantApplication numberUS 09/023,355Publication dateNov 9, 1999Filing dateFeb 13, 1998Priority dateFeb 17, 1997Fee statusPaidAlso published asDE69823571D1, EP0858812A2, EP0858812A3, EP0858812B1Publication number023355, 09023355, US 5980490 A, US 5980490A, US-A-5980490, US5980490 A, US5980490AInventorsAlexandre TsoukalisOriginal AssigneeMicrel, Microelectronic Applications Center Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (10), Referenced by (48), Classifications (5), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetLinear peristaltic pump
US 5980490 AAbstract
1. Linear peristaltic pump comprising:(a) a support plate: (b) a flexible tube supported on the support plate and having an input end connected to a fluid reservoir as well as an output end; and (c) Pumping operation device for squeezing the flexible tube in an operation sequence traveling along the flexible tube from the input end to the output end, the pumping operation device comprising:(i) a motor-driven cam shaft having an axis and being rotatable supported in parallel to the flexible tube, (ii) an input valve for opening and closing the flexible tube at the input end, the input valve having a first cam on the cam shaft and a first cam follower mounted for reciprocating movement in a direction normal to the axis of the cam shaft and provided with an end face for squeezing the flexible tube, (iii) at least one intermediate cam angularly displaced on the cam shaft relative to the first cam and an intermediate cam follower for each intermediate cam, each intermediate cam follower being mounted for reciprocating movement in a direction normal to the axis of the cam shaft and having an end face for squeezing the flexible tube, the at least one intermediate cam and each cam follower mounted to perform a pumping operation, wherein each of the at least one intermediate cam has three curve portions, namely a first portion with a continuously increasing radius for a pressing phase, a second, circumferential portion with a constant radius equal to the radius at the end of the first portion for maintaining the flexible tube closed, and a third portion with a sharp decrease of the radius for quick release of the flexible tube, and (iv) an output valve for opening and closing the flexible tube at the output end, the output valve having a last cam angularly displaced on the cam shaft relative to the first cam and the at least one intermediate cam, the output valve also having a last cam follower mounted for reciprocating movement in a direction normal to the axis of the cam shaft and provided with an end face for squeezing the flexible tube. 2. Linear peristaltic pump according to claim 1, wherein the last cam driving the last cam follower has an extended circumference portion with a large radius for closing the tube while pressure is built up by each intermediate cam follower thereby inflating the flexible tube, and the last cam further has a smaller radius at the end of a transition portion large enough to keep the flexible tube at least at a level where passing of liquid is just possible.
3. Linear peristaltic pump according to claim 2, wherein the at least one intermediate cam is four intermediate cams arranged with angular displacements between the four intermediate cams of 60�, the second, circumferential portion of the four intermediate cams is about 65�, and the extended circumferential portion of the last cam is extended by 60� to 125�.
6. Linear peristaltic pump comprising:(a) a support plate; (b) a flexible tube supported on the support plate and having an input end connected to a fluid reservoir as well as an output end; and (c) pumping operation device for squeezing the flexible tube in an operation sequence traveling along the flexible tube from the input end to the output end, the pumping operation device comprising:(i) a motor-driven cam shaft having an axis and being rotatable supported in parallel to the flexible tube, (ii) an input valve for opening and closing the flexible tube at the input end, the input valve having a first cam on the cam shaft and a first cam follower mounted for reciprocating movement in a direction normal to the axis of the cam shaft and provided with an end face for squeezing the flexible tube, (iii) at least one intermediate cam angularly displaced on the cam shaft relative to the first cam and an intermediate cam follower for each intermediate cam, each intermediate cam follower being mounted for reciprocating movement in a direction normal to the axis of the cam shaft and having an end face for squeezing the flexible tube, the at least one intermediate cam and each cam follower mounted to perform a pumping operation, (iv) an output valve for opening and closing the flexible tube at the output end, the output valve having a last cam angularly displaced on the cam shaft relative to the first cam and the at least one intermediate cam, the output valve also having a last cam follower mounted for reciprocating movement in a direction normal to the axis of the cam shaft and provided with an end face for squeezing the flexible tube, and (v) an additional flow linearizing cam on the cam shaft after the last cam and having a linearizing cam follower mounted for reciprocating movement in a direction normal to the axis of the cam shaft, the linearizing cam having an increasing radius portion with a maximum radius corresponding to a largest radius on the last cam, the linearizing cam also having a decreasing radius portion for a remainder thereof, the linearizing cam having a smallest radius so that the linearizing cam follower just touches the flexible tube. 7. Linear peristaltic pump according to claim 6, wherein the linearizing cam follower has an end face with a larger length in a longitudinal direction of the flexible tube than the end faces of the first, intermediate and last cam followers.
8. Linear peristaltic pump comprising.(a) a support plate; (b) a flexible tube supported on the support plate and having an input end connected to a fluid reservoir as well as an output end; (c) pumping operation device for squeezing the flexible tube in an operation sequence traveling along the flexible tube from the input end to the output end, the pumping operation device comprising:(i) a motor-driven cam shaft having an axis and being rotatable supported in parallel to the flexible tube, (ii) an input valve for opening and closing the flexible tube at the input end, the input valve having a first cam on the cam shaft and a first cam follower mounted for reciprocating movement in a direction normal to the axis of the cam shaft and provided with an end face for squeezing the flexible tube, (iii) at least one intermediate cam angularly displaced on the cam shaft relative to the first cam and an intermediate cam follower for each intermediate cam, each intermediate cam follower being mounted for reciprocating movement in a direction normal to the axis of the cam shaft and having an end face for squeezing the flexible tube, the at least one intermediate cam and each cam follower mounted to perform a pumping operation, and (iv) an output valve for opening and closing the flexible tube at the output end, the output valve having a last cam angularly displaced on the cam shaft relative to the first cam and the at least one intermediate cam, the output valve also having a last cam follower mounted for reciprocating movement in a direction normal to the axis of the cam shaft and provided with an end face for squeezing the flexible tube; and (d) an ultra-low displacement pressure transducer placed on the support plate under the flexible tube at a longitudinal position of the flexible tube between the first cam follower and the last cam follower, the pressure transducer for producing an output signal, an upper surface of the pressure transducer being flush with an upper surface of the support plate. 9. Linear peristaltic pump as claimed in claim 8, further comprising position sensor means for sensing a first position of the cam shaft at which the first cam follower is in a closed position and a second position at which the last cam follower is in a closed position thereby allowing to determine downstream pressure when the first position is detected from the output signal of the pressure transducer and upstream pressure within enclosed pressurized liquid inside the peristaltic pump when the second position is detected from the output signal of the pressure transducer.
13. Linear peristaltic pump as claimed in claim 9, wherein the pressure transducer makes pressure measurements used for obtaining status information about:reservoir empty, leaks, occlusion pressure, canula out of vein, and air in patient line. 14. Linear peristaltic pump comprising:(a) a support plate; (b) a flexible tube supported on the support plate and having an input end connected to a fluid reservoir as well as an output end; (c) pumping operation device for squeezing the flexible tube in an operation sequence traveling along the flexible tube from the input end to the output end, the pumping operation device comprising:(i) a motor-driven cam shaft having an axis and being rotatable supported in parallel to the flexible tube, (ii) an input valve for opening and closing the flexible tube at the input end, the input valve having a first cam on the cam shaft and a first cam follower mounted for reciprocating movement in a direction normal to the axis of the cam shaft and provided with an end face for squeezing the flexible tube, (iii) at least one intermediate cam angularly displaced on the cam shaft relative to the first cam and an intermediate cam follower for each intermediate cam. each intermediate cam follower being mounted for reciprocating movement in a direction normal to the axis of the cam shaft and having an end face for squeezing the flexible tube, the at least one intermediate cam and each cam follower mounted to perform a pumping operation, and (iv) an output valve for opening and closing the flexible tube at the output end, the output valve having a last cam angularly displaced on the cam shaft relative to the first cam and the at least one intermediate cam, the output valve also having a last cam follower mounted for reciprocating movement in a direction normal to the axis of the cam shaft and provided with an end face for squeezing the flexible tube; and (d) an air eliminating filter and an anti-syphon valve permanently connected in series with a patient line. 15. Linear peristaltic pump as claimed in claim 14, further comprising a reservoir provided with a filling valve which is actuated by a syringe for refilling the reservoir.
16. Linear peristaltic pump comprising:(a) a support plate; (b) a flexible tube supported on the support plate and having an input end connected to a fluid reservoir as well as an output end; (c) pumping operation device for squeezing the flexible tube in an operation sequence traveling along the flexible tube from the input end to the output end, the pumping operation device comprising:(i) a motor-driven cam shaft having an axis and being rotatable supported in parallel to the flexible tube, (ii) an input valve for opening and closing the flexible tube at the input end, the input valve having a first cam on the cam shaft and a first cam follower mounted for reciprocating movement in a direction normal to the axis of the cam shaft and provided with an end face for squeezing the flexible tube, (iii) at least one intermediate cam angularly displaced on the cam shaft relative to the first cam and an intermediate cam follower for each intermediate cam, each intermediate cam follower being mounted for reciprocating movement in a direction normal to the axis of the cam shaft and having an end face for squeezing the flexible tube, the at least one intermediate cam and each cam follower mounted to perform a pumping operation, and (iv) an output valve for opening and closing the flexible tube at the output end, the output valve having a last cam angularly displaced on the cam shaft relative to the first cam and the at least one intermediate cam, the output valve also having a last cam follower mounted for reciprocating movement in a direction normal to the axis of the cam shaft and provided with an end face for squeezing the flexible tube; and (d) a reservoir provided with a filling valve which is actuated by a syringe for refilling the reservoir. Description
From FIGS. 2 and 3 it can be seen that the end face 37 or finger of the cam follower 11a of the first cam 30a has fully squeezed the flexible tube 16 to its closed position (the dotted lines showing the flexible tube 16' in its fully open position). The individual cams 30, namely cams 30b-30e, have all substantially the same shape but are displaced angularly to each other by 60�. This displacement provides for a substantially even torque load to the motor 6. In FIG. 3, the input end 16a of the flexible tube 16 is seen on the left side of the drawing, whereas the output end 16b is shown on the right side.
Now, more details of the shape of the intermediate cams 30b-30e shall be described in connection with FIG. 6. As already mentioned in connection with FIGS. 2 and 3, each of the cams 30b-30e has a first portion 18 having a continuously increasing radius of calculated curvature, and in the present embodiment, this portion extends over an angle of 200�. The radius of the cam surface preferably increases linearly with the rotation angle in the direction of an arrow 32. The subsequent second portion 19 has a constant radius, i.e. the maximum radius R2. In the present embodiment, the portion 19 lasts for 65�. In the third portion 20 a sharp decrease from the maximum radius R2 to a minimum radius R6 takes place, in the present embodiment during a rotation angle of about 95�. The maximum radius R2 and the length of the cam followers 11 are such that the flexible tube 16 is completely closed. Although in FIG. 3, the end faces 37 of some of the cam followers 11 are shown at a distance from the flexible tube 16, this distance or gap is smaller or zero in practice.
Referring now to FIG. 5, the shape of the first cam 30a controlling the first cam follower 11a is described. In contrast to the intermediate cams 30b, 30c, 30d and 30e, the first cam 30a has two parts, namely a first part 19a with a large radius R1, and a second part 18a having a smaller radius R4. The part 18a having the smaller radius R4 extends over a range of approximately 55�, during which the tube 16 is only opened so much as needed for the filling process, whereas during the other part 19a the tube 16 is completely closed.
The last cam 30f as shown in FIG. 7, also differs from the intermediate cams 30b, 30c, 30d and 30e. In fact, a second, circumferential portion 19f, having a large radius R1, is extended by a certain range, preferably by 60�, as compared with the circumferential part 19 of the cams 30b-30e, i.e. the circumferential part 19f extends over a range of 65�+60�=125�, during which flexible the tube 16 is fully closed. In the remaining portion 18f of the last cam 30f, the radius R4 of the cam is such that the tube 16 is slightly compressed to such a value that the flow of fluid is permitted.
FIG. 8 now shows an additional, linearizing cam 30g which is placed behind the sixth other cams 30a-30f (FIG. 3) for the purpose of smoothing variations of the flow of fluid at the output during the pumping action. As FIG. 8 shows, the additional cam 30g has a first portion 18g during which the radius increases from a minimum radius R5 to a maximum radius R3. From this maximum value R3 the radius decreases during a second portion 20g to the minimum radius R5 again. The maximum radius R3 is smaller than the maximum radii R1, R2 of the other cams 30a-30f because the volume of the flexible tube 16 shall only be decreased but not closed. The angular duration of the first portion 18g is about 125�, whereas the remaining portion 20g is about 235�. While the output valve 11f is closed, liquid is expulsed by the flow linearizing cam follower 11g so that the output flow is not stopped, thus linearizing the flow.
While normally the lengths of the end faces 37 of the cam followers 11a-11g are the same in the longitudinal directions of the cam shaft 9 and the flexible tube 16, FIG. 3 shows that the length of cam follower 11g is longer than those of the other cam followers 11a-11f. The length of the linearizing cam follower 11g is shown about twice the length of the others in order to increase the linearizing function in view of the long close time of 125� of the last cam follower 11f. The length of the linearizing cam follower 11g can even be larger than twice the length of the others.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS2412397 *Dec 31, 1943Dec 10, 1946Harper Lyndus EFlexible tube pumpUS5078683 *May 4, 1990Jan 7, 1992Block Medical, Inc.Programmable infusion systemUS5165873 *Feb 20, 1992Nov 24, 1992Imed CorporationTwo-cycle peristaltic pumpEP0069350A1 *Jul 1, 1982Jan 12, 1983TERUMO KABUSHIKI KAISHA trading as TERUMO CORPORATIONMedication infusion deviceEP0225158A2 *Nov 25, 1986Jun 10, 1987Imed CorporationDual mode I.V. infusion deviceEP0431726A2 *Jul 23, 1990Jun 12, 1991Imed CorporationPeristaltic pump with mechanism for maintaining linear flowEP0560270A2 *Mar 9, 1993Sep 15, 1993Micrel Ltd, Microelectronic Applications CenterLinear peristaltic pumpGB2020735A * Title not availableSU941672A1 * Title not availableWO1984000690A1 *Aug 9, 1983Mar 1, 1984American Hospital Supply CorpPeristaltic fluid-pumping apparatus* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS6195887 *Jan 28, 1998Mar 6, 2001Baxter International IncVolumetric infusion pumpUS6213738 *Jan 28, 1998Apr 10, 2001Baxter International Inc.Volumetric infusion pumpUS6213739 *Jan 16, 1998Apr 10, 2001Niagara Pump CorporationLinear peristaltic pumpUS6820478 *Oct 18, 2000Nov 23, 2004T-Bra LimitedMeasuring device and methodUS6929235Apr 7, 2003Aug 16, 2005Massachusetts Institute Of TechnologyApparatus for flow rate controlUS6929236Apr 7, 2003Aug 16, 2005Massachusetts Institute Of TechnologyApparatus for flow rate controlUS7059840 *Apr 5, 2002Jun 13, 2006Sigma InternationalEnergy-saving, anti-free flow portable pump for use with standard PVC IV tubingUS7191957Jul 29, 2003Mar 20, 2007Joseph AndersonPeristaltic machine for depositing viscous materialsUS7608059May 25, 2004Oct 27, 2009Covidien AgFlow control apparatusUS7896197Mar 1, 2011Millipore CorporationFluid dispensing deviceUS7958915Jun 14, 2011Maguire Stephen BLiquid color gravimetric metering apparatus and methodsUS7980834Jul 19, 2011Maguire Stephen BLiquid color injection pressure booster pump and pumping methodsUS8092070Jan 10, 2012Maguire Stephen BGravimetric blender with power hopper coverUS8297954 *Oct 30, 2012Baxter International Inc.Rotary axial peristaltic pumps and related methodsUS8475409Jul 8, 2010Jul 2, 2013Micrel Medical Devices S.A.Infusion pumpUS8672879Oct 13, 2006Mar 18, 2014Argos Therapeutics, Inc.Devices, systems and related methods suitable for delivery of a liquid medicament stored at cryogenic temperaturesUS8678793Sep 12, 2011Mar 25, 2014Q-Core Medical Ltd.Finger-type peristaltic pumpUS8757217May 18, 2011Jun 24, 2014Stephen B. MaguireMethods for gravimetrically metering liquid colorUS8800821Feb 16, 2010Aug 12, 2014Maguire Products, Inc.Disposable low-cost pump in a container for liquid color dispensingUS8894391 *Sep 16, 2008Nov 25, 2014Fresenius Vial SasLinear peristaltic pump with fingers and membrane and finger for such a pumpUS8920144Jan 16, 2013Dec 30, 2014Q-Core Medical Ltd.Peristaltic pump with linear flow controlUS9010988Jan 9, 2012Apr 21, 2015Stephen B. MaguireGravimetric blender with power hopper coverUS9056160Sep 1, 2013Jun 16, 2015Q-Core Medical LtdMagnetically balanced finger-type peristaltic pumpUS9140252 *Jun 8, 2011Sep 22, 2015Seiko Epson CorporationFluid transporterUS9163623 *Dec 8, 2011Oct 20, 2015Carefusion 303, Inc.System and method for improved flow uniformity in a peristaltic pump mechanismUS9188118Jun 7, 2013Nov 17, 2015Stephen B. MaguireInjection molded diaphragm pump for liquid color with quick releaseUS9333290Nov 13, 2007May 10, 2016Q-Core Medical Ltd.Anti-free flow mechanismUS20030192919 *May 20, 2003Oct 16, 2003Nguyen Khoi MinhFluid delivery mechanismUS20040022656 *Jul 29, 2003Feb 5, 2004Joseph AndersonPeristaltic machine for depositing viscous materialsUS20050109795 *Nov 19, 2004May 26, 2005Furey James F.Fluid dispensing deviceUS20050267439 *May 25, 2004Dec 1, 2005Sherwood Services, Ag.Flow control apparatusUS20060280633 *Aug 13, 2004Dec 14, 2006Seiko Epson CorporationTube pummpUS20070289659 *Jun 16, 2006Dec 20, 2007Maguire Stephen BLiquid color gravimetric metering apparatus and methodsUS20070292288 *Jun 16, 2006Dec 20, 2007Maguire Stephen BMultiple pusher liquid color pumpUS20090196776 *Apr 15, 2009Aug 6, 2009Baxter International Inc.Rotary axial peristaltic pumps and related methodsUS20100036322 *Nov 13, 2007Feb 11, 2010Q-Core Medical Ltd.Anti-free flow mechanismUS20100296955 *Sep 16, 2008Nov 25, 2010Fresenius Vial SasLinear peristaltic pump with fingers and membrane and finger for such a pumpUS20110009814 *Jan 13, 2011Achilleas TsoukalisInfusion pumpUS20110200464 *Feb 16, 2010Aug 18, 2011Maguire Paul SherwoodMethod and disposable low-cost pump in container for liquid color dispensingUS20110305588 *Dec 15, 2011Seiko Epson CorporationFluid transporterUS20130149172 *Dec 8, 2011Jun 13, 2013Carefusion 303, Inc.System and method for improved flow uniformity in a peristaltic pump mechanismUS20130287612 *Jun 27, 2013Oct 31, 2013Seiko Epson CorporationTube unit, control unit, and micropumpUS20140243745 *Sep 11, 2012Aug 28, 2014Mitsutaka UedaInfusion pumpCN102512726A *Jan 17, 2012Jun 27, 2012南京扬子医用制品有限公司Microinfusion pumpEP2289579A2Jul 8, 2010Mar 2, 2011Achilleas TsoukalisPortable infusion pumpEP2708251A1Sep 17, 2013Mar 19, 2014Micrel Medical Devices S.A.Infusion rotary peristaltic pumpEP2868336A2Oct 17, 2014May 6, 2015Micrel Medical Devices S.A.Infusion pump device with pressure controlling meansWO2013103788A2Jan 4, 2013Jul 11, 2013Gojo Industries, Inc.Peroxide powered product dispensing system* Cited by examinerClassifications U.S. Classification604/151, 417/474International ClassificationF04B43/08Cooperative ClassificationF04B43/082European ClassificationF04B43/08BLegal EventsDateCodeEventDescriptionJun 8, 1998ASAssignmentOwner name: MICREL, MICROELECTRONIC APPLICATIONS CENTER LTD.,Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TSOUKALIS, ALEXANDRE;REEL/FRAME:009444/0708Effective date: 19980331Aug 8, 2000CCCertificate of correctionMay 9, 2003FPAYFee paymentYear of fee payment: 4May 28, 2003REMIMaintenance fee reminder mailedMay 9, 2007FPAYFee paymentYear of fee payment: 8Apr 6, 2011FPAYFee paymentYear of fee payment: 12RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services