US20090162212A1 - Peristaltic pump assembly - Google Patents
Peristaltic pump assembly Download PDFInfo
- Publication number
- US20090162212A1 US20090162212A1 US12/002,999 US299907A US2009162212A1 US 20090162212 A1 US20090162212 A1 US 20090162212A1 US 299907 A US299907 A US 299907A US 2009162212 A1 US2009162212 A1 US 2009162212A1
- Authority
- US
- United States
- Prior art keywords
- rollers
- guide element
- assembly
- drive shaft
- roller assembly
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
- F04B43/1253—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing
- F04B43/1261—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing the rollers being placed at the outside of the tubular flexible member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
- F04B43/1253—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing
- F04B43/1269—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing the rotary axes of the rollers lying in a plane perpendicular to the rotary axis of the driving motor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- External Artificial Organs (AREA)
- Reciprocating Pumps (AREA)
Abstract
A peristaltic pump assembly includes a cassette configured to be operatively engaged with a pump housing. A roller assembly is operatively disposed within a cavity formed into the cassette. The roller assembly includes a plurality of rollers that may be arranged in a planetary configuration around a drive shaft. At least one guide element is disposed about the periphery of the roller assembly and in engagement with at least a portion of an outer surface of each of the plurality of rollers. The guide element is configured to guide the plurality of rollers when the plurality of rollers is rotating.
Description
- The present disclosure relates generally to peristaltic pumps and, more particularly, to a peristaltic pump assembly.
- Rotary-style peristaltic infusion pumps are often used to deliver fluid in a very controlled manner such as, for example, the intravenous delivery of medicine to a patient. These peristaltic pumps typically include a disposable pumping cassette and an assembly of radially arranged rollers received within a cavity of the cassette, wherein the rollers revolve together when rotationally driven by a drive shaft operated by a pump motor. A flexible tubing is disposed around a portion of the assembly of rollers and generally exerts a force against the rollers in contact therewith to thereby hold the rollers against the drive shaft.
- In response to rotational movement of the rollers, portions of the flexible tube that are in contact with the rollers compress or otherwise occlude against a wall of the cassette. As a result, fluid traveling through the tube is temporarily trapped in the tube between the occluded points. The trapped fluid is released from the tube when the occlusion force on the tube is released. In this manner, fluid is urged through the tube via peristaltic wave action.
- Sometimes a roller may not directly contact the tubing. In this instance, the roller(s) may undesirably move or shift and lose proper contact with the drive shaft. This could cause errors in various pumping operations, which may diminish the overall performance of the pump.
- Disclosed herein is a peristaltic pump assembly including a cassette configured to be operatively engaged with a pump housing. A roller assembly is operatively disposed within a cavity of the cassette and includes a plurality of rollers that may be arranged in a planetary configuration around a drive shaft. At least one guide element is disposed about the periphery of the roller assembly and in engagement with at least a portion of an outer surface of each of the plurality of rollers.
- Features and advantages of embodiment(s) of the present disclosure will become apparent by reference to the following detailed description and drawings, in which like reference numerals correspond to similar, though perhaps not identical components. Reference numerals having a previously described function may or may not be described in connection with other drawings in which they appear.
-
FIG. 1 is a semi-schematic perspective view of an example of a rotary-style peristaltic infusion pump with an example of a cassette received therein; -
FIG. 2 is a semi-schematic top view of a disposable pump cassette showing an assembly of rollers in an example position; -
FIG. 2A is a semi-schematic, cutaway top view of a disposable pump cassette showing the assembly of rollers in another example position; -
FIG. 3 is a side view of an example configuration of a roller for the roller assembly; -
FIG. 4 is a perspective view of an assembly of a plurality of rollers and an example of a guide element; and -
FIG. 5 is a cutaway top view of the peristaltic pump ofFIG. 1 . - Embodiment(s) of the peristaltic pump assembly as disclosed herein advantageously guide and/or locate a plurality of rollers of a roller assembly in response to rotational movement of a drive shaft to thereby maintain contact of the rollers with the drive shaft. The guide element may also improve the overall performance of the peristaltic pump by, for example, enabling the pump to achieve higher precision in fluid volume delivery. The guide element is also relatively simple to incorporate into the pump assembly.
- With reference now to the drawings,
FIG. 1 provides a rotary-styleperistaltic infusion pump 10 including adisposable pump cassette 12 operatively disposed within a cassette receiving cavity (not shown) formed into apump housing 14. Apump motor 16, disposed below thepump housing 14, powers rotational movement of adrive shaft 18. Thedrive shaft 18 extends through a bore (not shown) formed in thepump housing 14, through the cassette receiving cavity, and through a bore (not shown) formed in thecassette 12. - As shown in
FIG. 2 , thecassette 12 includes abase 22 and awall 24, thereby defining a generally cylindrically-shaped cavity 26 therein. A flexible or otherwisecompressible tubing 28 is disposed through aninlet 30 of thecassette 12, around a substantial portion of aninner surface 32 of thewall 24, and through anoutlet 34. Thetubing 28 is generally disposable and is often made of a polymeric material, non-limiting examples of which include silicones, AUTOPRENE (an opaque thermoplastic rubber with high wear resistance derived from SANTOPRENE, commercially available from Advanced Elastomer Systems, a subsidiary of ExxonMobil Chemical located in Houston, Tex.), VITON (a black fluoroelastomer with resistance to concentrated acids, solvents, ozone, radiation and temperatures up to 200° C. with good chemical compatibility, commercially available from DuPont Performance Elastomers located in Wilmington, Del.), TYGON (good chemical resistance with a clear finish, commercially available from Saint-Gobain Performance Plastics Corporation located in Akron, Ohio), PROTHANE II (a transparent, blue, polyester, polyurethane tubing with good chemical resistance, commercially available from Randolph Austin Company located in Manchaca, Tex.), and/or the like, and/or combinations thereof. The inner diameter of thetube 28 may be selected based on the desirable flow rates and the desirable viscosities of the fluid that will flow therethrough. - Referring also to
FIGS. 3 and 4 , anassembly 36 ofsatellite rollers 38 is received within thecavity 26 of thecassette 12 and located adjacent to and abutting a substantial portion of thetubing 28. Eachroller 38 includes a generally cylindrically-shaped body 42 including anouter surface 40 and aninner surface 41, a spacing orcavity 44 defined by theinner surface 41, and two generally cylindrically-shaped ends outer surface 40 of theroller 38 may be contoured (as best shown inFIG. 3 ). In an embodiment, theend 46 is a closed end, and theend 48 is an open end. It is to be understood that therollers 38 rotate both individually and rotate as an assembly inside thecavity 26 of thecassette 12. - The
rollers 38 are radially arranged in thecavity 26 around thedrive shaft 18 that protrudes into thecavity 26 through the bore (not shown) formed into thebase 22 of thecassette 12. As shown inFIG. 2 , theassembly 36 ofrollers 38 may be arranged in a planetary configuration with respect to thedrive shaft 18. In an embodiment, therollers 38 are made from a polymeric material such as, for example, acetal, polytetrafluoroethylene (e.g., Teflon® manufactured by E. I. du Pont de Nemours and Company, Wilmington, Del.), or the like, or combinations thereof. However, it is to be understood that any suitable material may be used, as desired. - In an embodiment, e.g., as shown in
FIG. 3 , therollers radial flange 49 formed on one or both cylindrically-shaped ends 46′, 48′, where theradial flange 49 protrudes radially outwardly from the periphery of theends 46′, 48′. Theouter surface 40 of therollers 38 may include anannular notch 51 formed therein, substantially adjacent to at least one of theflanges 49. The annular notch(es) 51 are configured to retain the guide element(s) 50 in a desirable operating position when placed over theroller assembly 36. As disclosed further herein, e.g., in connection withFIG. 4 , theradial flange 49 and/or theannular notch 51 allow(s) theguide element 50 to engage therollers 38, and substantially prevent(s) the guide element(s) 50 from slipping off of theroller assembly 36. Further, as mentioned above, therollers 38 may have a contouredouter surface 40, and thissurface 40 may also be configured to facilitate retention of the guide element(s) 50 in a desirable operating position when placed over theroller assembly 36. - The
drive shaft 18 is generally knurled, roughened, and/or etched, or otherwise configured to frictionally engage theouter surface 40 of eachroller drive shaft 18. The roller assembly 36 (i.e., therollers drive shaft 18. - When the
pump 10 is operating, rotational movement of theroller assembly 36 pumps the liquid through thetubing 28 to create a pressurized flow thereof. Thetubing 28 compresses or otherwise occludes at a number of points in contact with therollers roller assembly 36 and theindividual rollers tubing 28 between two points of occlusion (i.e., from oneroller adjacent roller tubing 28 via peristaltic wave action at a flow rate determined by the rotational rate (rpm) of thedrive shaft 18, and released when thetubing 28 is no longer occluded by therollers - In every revolution of the
roller assembly 36, eachroller tubing 28 generally between the five o'clock and the seven o'clock positions (e.g., as shown inFIG. 2 ). - As shown in
FIG. 2A , aroller 38′ is located at the six o'clock position (i.e., a position between the five o'clock and the seven o'clock positions). Since (in this position) thetubing 28 is not generating a radially inward force against theroller 38′ to hold theroller 38′ against thedrive shaft 18, theroller 38′ may, in some instances, shift or slightly move within thecavity 26. As such, theroller 38′ may lose desirable contact with thedrive shaft 18 and may slip when thedrive shaft 18 rotates. This situation may, in some instances, deleteriously affect the overall performance of theperistaltic pump 10. - Referring now to
FIG. 4 , contact between therollers drive shaft 18 may be improved upon by disposing aguide element 50 about the periphery of theroller assembly 36. Theguide element 50 suitably maintains therollers drive shaft 18, whereby reduction in lateral movement of therollers rollers - The
guide element 50 may be described as a continuous member that surrounds the entire periphery of theroller assembly 36. In an embodiment, theguide element 50 may be two bands (e.g., O-rings), each band having a substantially circular cross section (though it is to be understood that any suitable cross-sectional shape may be used, if desired), with a diameter ranging from about 0.5 mm to about 0.7 mm (though, similarly, it is to be understood that any suitable cross-sectional size may be used, if desired). As shown, guideelements 50 may be received within the annular notch(es) 51, if desired, to further aid in retaining the guide element(s) 50 in a desirable position. Although twoguide elements 50 are shown inFIG. 4 , it is to be understood that one, or more than twoguide elements 50 may be operatively disposed about the periphery of theroller assembly 36. The guide element(s) 50 may have any suitable width, but generally do not overlap with each other (if more than oneguide element 50 is used). Further, other configurations and/or constructions of theguide element 50 are also contemplated as being within the purview of the present disclosure, non-limiting examples of which include one or more washer(s), and/or the like, and/or combinations thereof. - The
guide element 50 may be fabricated from any suitable elastomeric material. In a non-limiting embodiment, theguide element 50 is formed from polymeric materials, e.g., silicones, natural or synthetic rubbers, and/or the like, and/or combinations thereof. The polymeric materials are generally flexible. - The
guide element 50, formed from the selected elastomeric material(s), is stretched around therollers rollers drive shaft 18. Theguide element 50 is generally useful when therollers drive shaft 18. This is the position at which therollers guide element 50 therearound) may stall and may then cause a jam when theroller guide element 50 generally engages theouter surface 40 of therollers outer surface 40 and theguide element 50 is overcome by driving forces of thedrive shaft 18. The guide element(s) 50 also rotate as therollers - In an embodiment, the
guide element 50 is formed from an elastomeric polymeric material wherein the material is configured to stretch a predetermined amount beyond its relaxed state so as to minimize the normal force created. In contrast, higher normal forces created by stretching the material more than the predetermined amount may in some instances require an undesirable amount of power to drive the rollers, which may in turn undesirably reduce the battery life. In an embodiment, the predetermined amount is about 5% beyond the material's relaxed state. - Still referring to
FIG. 4 , theroller assembly 36 including the guide element(s) 50 may be assembled by slipping or otherwise placing theguide element 50 over one of theends rollers roller assembly 36. Theouter surface 40 of therollers guide element 50. In an embodiment, if theassembly 36 includes the configuration of therollers 38′ as depicted inFIG. 3 (wherein theouter surface 40 of therollers 38′ includes at least one radial flange 49), the guide element 50 (e.g., if made from a flexible polymeric material) may be stretched and then slipped over the radial flange 49 (and into annular notch(es) 51, if provided). - In other embodiments, as mentioned above, one, or more than one
guide element 50 may be placed or otherwise disposed about the periphery of theroller assembly 36. The one or a plurality ofguide elements 50 may be situated in any position against theouter surface 40 of therollers tubing 28 comes into contact with therollers - With reference now to
FIG. 5 , an example of a method of assembling a portion of theperistaltic pump 10 is shown. Thedrive shaft 18 protrudes through a bore formed into thepump housing 14 and through thecavity 26 of thecassette 12. In thecassette 12, thetubing 28 is fed through theinlet 30, around theinner surface 32 of thewall 24, and through theoutlet 34. The guide element(s) 50 are placed in contact with theouter surface 40, adjacent to the flange(s) 49 of therollers roller assembly 36. Theroller assembly 36, including the guide element(s) 50, is placed within thecavity 26, wherein therollers drive shaft 18 and also abut (in some positions) a portion of thetubing 28. A cover (not shown) may be disposed over theroller assembly 36 and may be latched or otherwise fixed to thewall 24 of thecassette 12. - While several embodiments have been described in detail, it will be apparent to those skilled in the art that the disclosed embodiments may be modified. Therefore, the foregoing description is to be considered exemplary rather than limiting.
Claims (20)
1. A peristaltic pump assembly, comprising:
a cassette configured to be operatively engaged with a pump housing, wherein the cassette includes a cavity formed therein;
a roller assembly operatively disposed within the cavity of the cassette, the roller assembly including a plurality of rollers arranged around a drive shaft, wherein each of the plurality of rollers includes an outer surface; and
at least one guide element disposed about at least a portion of a periphery of the roller assembly and in engagement with at least a portion of the outer surface of each of the plurality of rollers.
2. The assembly as defined in claim 1 wherein the at least one guide element is a continuous member.
3. The assembly as defined in claim 1 wherein the at least one guide element surrounds the entire periphery of the roller assembly.
4. The assembly as defined in claim 1 wherein the at least one guide element is one of a ring or a washer.
5. The assembly as defined in claim 1 wherein the at least one guide element is fabricated from elastomeric materials.
6. The assembly as defined in claim 1 , wherein the at least one guide element is fabricated from an elastomeric material configured to stretch a predetermined amount beyond its relaxed state so as to minimize the normal force created.
7. The assembly as defined in claim 6 wherein the predetermined amount is about 5%.
8. The assembly as defined in claim 5 wherein the elastomeric materials are polymeric materials selected from silicones, natural or synthetic rubbers, and combinations thereof.
9. The assembly as defined in claim 1 wherein the roller assembly rotates as a single unit while the at least one guide element is disposed about the periphery thereof.
10. The assembly as defined in claim 1 wherein each of the plurality of rollers includes an axis of rotation such that each roller rotates individually while the at least one guide element is disposed about the periphery of the roller assembly.
11. The peristaltic pump assembly as defined in claim 1 wherein the outer surface of each of the plurality of rollers is configured to retain the at least one guide element.
12. The assembly as defined in claim 1 wherein the at least one guide element is configured to guide the plurality of rollers when the plurality of rollers is rotating, and wherein the at least one guide element is an O-ring.
13. The assembly as defined in claim 1 wherein each of the plurality of rollers has two opposed ends and at least one radial flange protruding outwardly from at least one of the two opposed ends, and wherein the at least one radial flange is configured to retain the at least one guide element.
14. The assembly as defined in claim 1 wherein each of the plurality of rollers has two opposed ends and at least one annular notch defined in each of the rollers substantially adjacent at least one of the two opposed ends, and wherein the at least one annular notch is configured to retain the at least one guide element.
15. A method for guiding a plurality of rollers for a peristaltic pump, the peristaltic pump including a drive shaft, the method comprising:
arranging the plurality of rollers around the drive shaft, wherein each of the plurality of rollers includes an outer surface;
disposing at least one guide element about a periphery of the arranged plurality of rollers and in engagement with at least a portion of the outer surface of each of the plurality of rollers; and
rotating the drive shaft to impart rotational movement to the roller assembly.
16. The method as defined in claim 15 , further comprising configuring the outer surface of each of the plurality of rollers to retain the at least one guide element.
17. The method as defined in claim 15 , further comprising guiding the plurality of rollers when the plurality of rollers is rotating, wherein the at least one guide element is an O-ring.
18. The method as defined in claim 15 , further comprising maintaining frictional contact between the plurality of rollers and the drive shaft.
19. The method as defined in claim 15 , further comprising:
rotating the roller assembly as a single unit while the at least one guide element is disposed about the periphery thereof; and
rotating the plurality of rollers individually while the at least one guide element is disposed about the periphery of the roller assembly.
20. The method as defined in claim 18 wherein frictional contact between the plurality of rollers and the drive shaft is maintained by the guiding of the plurality of rollers.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/002,999 US20090162212A1 (en) | 2007-12-19 | 2007-12-19 | Peristaltic pump assembly |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/002,999 US20090162212A1 (en) | 2007-12-19 | 2007-12-19 | Peristaltic pump assembly |
Publications (1)
Publication Number | Publication Date |
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US20090162212A1 true US20090162212A1 (en) | 2009-06-25 |
Family
ID=40788860
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/002,999 Abandoned US20090162212A1 (en) | 2007-12-19 | 2007-12-19 | Peristaltic pump assembly |
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US (1) | US20090162212A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019072260A (en) * | 2017-10-17 | 2019-05-16 | 株式会社ジェイ・エム・エス | Tube transfusion mechanism |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2899904A (en) * | 1959-08-18 | Roller pump | ||
US3122103A (en) * | 1961-10-24 | 1964-02-25 | Thomas F Ormsby | Flexible hose pump with resiliently pressed rollers |
US3789684A (en) * | 1972-11-07 | 1974-02-05 | Simplicity Mfg Co Inc | Air cooled shuttle clutch transmission |
US4008929A (en) * | 1974-08-12 | 1977-02-22 | Henrik Gerner Olrik | Friction drive device |
US5470212A (en) * | 1993-05-07 | 1995-11-28 | Pearce; Francis H. | Humidity control system including a peristaltic pump and incubators containing the same |
US5655897A (en) * | 1993-08-06 | 1997-08-12 | Debiotech S.A. | Peristaltic pump cassette |
US5718568A (en) * | 1992-04-24 | 1998-02-17 | Debiotech S.A. | Drive shaft for a peristaltic pump |
US5741125A (en) * | 1994-05-11 | 1998-04-21 | Debiotech S.A. | Peristaltic pump device having an insert cassette of reduced complexity |
US20010040325A1 (en) * | 1997-06-17 | 2001-11-15 | Lowe Hauptman Gilman & Berner, Llp | Fastening support |
US20040067827A1 (en) * | 2002-10-02 | 2004-04-08 | Tustin Thomas Mark | Dynamic exercise apparatus and method |
-
2007
- 2007-12-19 US US12/002,999 patent/US20090162212A1/en not_active Abandoned
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2899904A (en) * | 1959-08-18 | Roller pump | ||
US3122103A (en) * | 1961-10-24 | 1964-02-25 | Thomas F Ormsby | Flexible hose pump with resiliently pressed rollers |
US3789684A (en) * | 1972-11-07 | 1974-02-05 | Simplicity Mfg Co Inc | Air cooled shuttle clutch transmission |
US4008929A (en) * | 1974-08-12 | 1977-02-22 | Henrik Gerner Olrik | Friction drive device |
US5718568A (en) * | 1992-04-24 | 1998-02-17 | Debiotech S.A. | Drive shaft for a peristaltic pump |
US5470212A (en) * | 1993-05-07 | 1995-11-28 | Pearce; Francis H. | Humidity control system including a peristaltic pump and incubators containing the same |
US5655897A (en) * | 1993-08-06 | 1997-08-12 | Debiotech S.A. | Peristaltic pump cassette |
US5741125A (en) * | 1994-05-11 | 1998-04-21 | Debiotech S.A. | Peristaltic pump device having an insert cassette of reduced complexity |
US20010040325A1 (en) * | 1997-06-17 | 2001-11-15 | Lowe Hauptman Gilman & Berner, Llp | Fastening support |
US20040067827A1 (en) * | 2002-10-02 | 2004-04-08 | Tustin Thomas Mark | Dynamic exercise apparatus and method |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019072260A (en) * | 2017-10-17 | 2019-05-16 | 株式会社ジェイ・エム・エス | Tube transfusion mechanism |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: DELPHI TECHNOLOGIES, INC.,MICHIGAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SHUKUR, FAEZ J;NELSON, JAMES E.;VOLTENBURG, ROBERT R., JR.;SIGNING DATES FROM 20071126 TO 20071127;REEL/FRAME:020331/0059 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |