GB2076068A - Peristaltic fluid-machines - Google Patents
Peristaltic fluid-machines Download PDFInfo
- Publication number
- GB2076068A GB2076068A GB8016194A GB8016194A GB2076068A GB 2076068 A GB2076068 A GB 2076068A GB 8016194 A GB8016194 A GB 8016194A GB 8016194 A GB8016194 A GB 8016194A GB 2076068 A GB2076068 A GB 2076068A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tube
- profiled
- rotatable shaft
- face
- section
- 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.)
- Granted
Links
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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Abstract
A pump comprises a housing 2, 3 having a supporting face or "track" 15 for a pumping tube 12 and a rotary structure 18 carrying at least four freely-rotatable tube-compressing rollers 17. The track comprises three concave arcuate sections (15a, b, c), Figs. 3 and 5 (not shown), having a geometry in relation to the rollers such that the tube is first gradually compressed until closed, compression is then constant and finally the compression is gradually released, fluctuations in the flow rate being thereby reduced. The housing may comprise two halves (as shown) and be made of a transparent plastics material. The rollers may be made molybdenum disulphide filled nylon. The pumping tube may be immersed in a lubricant or cooling fluid. <IMAGE>
Description
SPECIFICATION
Pumps
This invention relates to peristaltic or rotary pumps of the flexible tube type of the kind having the tube carried by a supporting face and rotary member provided with a plurality of roller elements moveable along the tube compressing it.
There are a number of different types of peristaltic pumps, all of which operate to provide a moving region or moving regions of compression along the length of a compressible fluid containing tube. The movement of the compressed region forces fluid ahead of it, and the action of the tube returning suddently to its uncompressed state provides a partial vacuum to cause fluid to flow in behind the compressed area in the tube. Simultaneously a small fluid flow may occur from beyond the released compressed area, this is referred to as suck back. If the compression is removed from the tube suddenly, the suck back may be large enough to noticeably reduce the flow from the outlet of the tube or even to stop the flow and in some extreme cases to give rise momentarily to a reverse flow.
Secondly, because of the release of a differential pressure on the tube between the suction side and delivery side of the compression the tube may relax and tube slip back may occur. These phenomena may cause large and sudden superimposed pulsations on otherwise steady and constant flow of fluid.
These pulsations are considered a serious disadvantage particularly where a measured flow which is capable of being closely regulated is required, for example for use in the laboratory in column chromatography.
The pump of the present invention overcomes these disadvantages by providing the tube in the form of an open loop lying on a specially profiled supporting face whereby the compression on the tube is gradually reduced from the tube. This is achieved by so profiling the supporting face in relation to the roller means whereby the bore of the tube returns to its normal value from completely closed gradually thereby directly compensating for any tendency of the iiquid to suddenly suck back along the tube when the compression is released. The suck back is spread evenly through the period of gradually releasing compression thereby preventing any sudden disadvantageous interruptions to the constant flow.A second advantage is found in that the gradual release of compression together with the presence of the fluid conducting tube in a loop reduces the tendency of the tube to slip-back or wander over the profiled supporting face, which further removes the necessity for a tube retaining groove found in other peristaltic pumps of the flexible tube type. This has the advantage of simplifying production and reduces wear due to interaction between the rotary means and the groove or walls of the groove.
Thus the present invention provides a constant flow peristaltic pump comprising a rotary structure driven via a rotatable shaft by an external drive means, a flexible tube supported by a profiled supporting face, wherein the rotary structure comprises support members being mounted for rotation on the rotatable shaft having extending between them at least four freely-rotatable axially mounted rollers each capable of rolling on the tube along the profiled support-face, wherein the profiled tube supporting face and the rolling face of the roller are so arranged in relation to one other that in the first section of the profiled support face the roller rolls on the tube to gradually compress the tube until it is closed, in a second section the roller rolls on the tube to maintain the compression and in the third section the rollers roll to gradually release the compression, wherein the distance (r3) between the axis of the rotatable shaft and any point on the face of the first or third sections of the profiled support face is given by
r3 = r2 + (2 x tube wall thickness) + (D x tube bore) where r2 is the distance between the axis of rotatable shaft and the rolling surface of each roller, and D is a variable factor dependent on the displacement of the roller along the track, and the distance (r4) between the axis of the rotatable shaft and the second section of the profiled support face is given by
r4 = r2 + (2 x tube wall thickness).
Figure 5 as hereinafter described, illustrates a cross-section of a particularly preferred embodiment of the invention taken transverse to the axis of the rotatable shaft showing the relationship of the rollers 17 to the profiled supporting face 1 5. The fluid conducting tube 12 extends through inlet hole 13 passing along the profiled supporting face 1 5 between the rollers 1 7 and the face in the form of a loop before exiting through outlet hole 14. The profiled support face 1 5 comprises of three adjoining arcuate sections 1 5a, 1 5b and 1 5c, each extending over an angle of 900 subtended at their centre.The middle section 1 sub lies on a circle co-axial with the rotatable shaft 16, the distance (r4) between the axis of rotation of the rotatable shaft and the surface of the profiled supporting face being given as follows: r4 = r2 + (2 x tube wall thickness) where r2 is the distance between the axis of rotation of the rotatable shaft and the rolling face of the rollers. Thus the tube 12 is completely compressed by roller 1 7 as it moves through this section. The
faces of the two outer sections 1 5a and 1 Sc gradually increase their distance from the axis of rotation of
the shaft.This distance (r3) is given for any point along the sections 1 spa or 1 sic by the formula,
r3 = r2 + (2 x tube wall thickness) + (D x the bore of the tube)
where r2 is as defined herein above and D is a factor which varies as the angular displacement of the
roller along either of the sections 1 5a or 1 5c. This factor and hence the ability to produce the profiled
supporting face, may be derived for use with a tube of given wall thickness and bore by means of a
graph.With reference to Figure 6, curve 1 represents the volume of liquid thatwould be sucked back for
a given instantaneous release of compression on a tube which has a wall thickness of 1.6 mm and a
bore of 4.8 mm, by linear movement of the compressive force, for example caused by the roller, away from the tube in a direction perpendicular to the tube. Thus if the tube were allowed to return from totally closed to uncompressed the value of the suck back would be 0.22 ml, if the tube were half closed the suck back would be 0.04 ml. It has been stated herein that the gap between the roller face and the supporting face increases in the arcuate section 1 Sc for example by a value equal to the bore of the tube, thus the suck back volume may be directly linked to the gap between the roller and the support face.It is clear from the sinuous nature of curve 1 that the major part of the suck back will occur in the initial stages of the opening of the tube on release of compression, hence a pulsation will occur. Curve 3 shows an idealised situation in which the suck back is maintained at a constant rate over the release of compression thereby removing any pulsation in the flow. To achieve this idealised state the track may be profiled so that the initial release of compression is more gradual at the beginning of the section 1 Sc and increases rapidly towards the end there by compensating directly for the rapid suck back in the initial stages of removal of compression. The profiled support face is represented in curve 2.
It is more advantageous to relate the profiling of the face that is the distance (r3) to the angular displacement along the supporting face, a, by a factor D. Ciearly as section 1 Sc is traversed by the roller
D will change from 0 to 1 as a changes from 0 to 900. D does not vary linearly with a, but as shown from curve 2 but varies sinuously. This is illustrated by curve 4 in Figure 7.
The profiled supporting face is unique to a tube of given bore and wall thickness, but may be derived in a similar manner for any tube. The symmetry of the device allows the pump to be driven in either direction with equally favourable results. The profiled supporting face may be produced in practice by injection moulding, or for special profiles for non-standard tubes by milling.
If a four-roller rotary structure is used, then the profiled sections each subtend 900 at their centre.
If a six-rotler rotary structure is envisaged, then the three arcuate sections are correspondingly shorter and subtend 600 at their centre, that is if x is the number of rollers in the rotary structure where x > 4, the length of the arcuate sections is given by the angle (P) they subtend at their centre i.e.
3600 ,B=,x=4,/3=90 ;x=5"B=72;x=6,=60 x
Thus a preferred embodiment of the present invention provides a constant flow peristaltic pump
comprising a housing having a rotatable shaft mounted on bearings therein, said housing having a
profiled supporting face therein extending around the inner surface thereof, a fluid conducting tube
positioned on said profiled supporting face in said housing forming a loop, a rotary structure including a
pair of axially spaced support members positioned on either side of said profiled supporting face each support member being supported for rotation on said rotatable shaft in said housing, said rotary structure including at least four of axially mounted freely-rotatable rollers extending between said support members and engageable with said tube to compress same against the profiled supporting face to produce a constant flow delivery of fluid in response to the rotation of said support members.
A preferred embodiment of the present invention provides a peristaltic pump as herein described in which the profiled supporting face comprises three sections adjoining one another, the middle section being coaxial with the rotatable shaft, the other two of said sections being on either side the middle section each being in the form of an arcuate section eccentric with respect to said rotatable shaft, the radii of the three sections being so chosen that in the first section traversed by said rollers the tube is gradually compressed until it is closed at the point of contact with the roller, in said middle section said roller rolls on said tube to maintain said compression and in the third section said roller gradually releases said compression.
A particularly preferred embodiment of the present invention provides a peristaltic pump as herein described in which the rotary structure comprises a pair of axially spaced support members positioned on either side of said profiled supporting face each supporting member being supported for rotation on said rotatable shaft, said rotary structure includes four symmetrically placed axially mounted freelyrotatable rollers extending between said support means, capable of compressing the fluid containing tube in a manner described herein.
One preferred embodiment of the peristaltic pump according to the invention is illustrated in the drawings in which Figure 1 is an exploded side view of a peristaitic pump constructed according to the invention.
Figure 2 is a view from above the peristaltic pump showing the tube inlet and outlet and the fastening means.
Figure 3 is a six roller pump in cross-section as described.
Figure 4 is a side view of the rotating structure of four roller-type.
Figure 5 is a cross-section taken transverse to the axis of the rotatable shaft showing the relationship of the rollers and profiled support means.
Figure 6 shows graph of (1) variation of suck back with release of compression, (3) an idealised constant rate of suck backand (2) the tube profile required to produce the rate given by graph (3).
Figure 7 shows the relationship between angular displacement of the roller along section 1 Sc and factor D as herein defined, to enable a supporting face of the correct profile to be produced.
The pump includes a housing 1 formed from identical halves 2 and-3. The housing is preferably constructed of a transparent plastic, for example polymethylmethacrylate or polycarbonate. The interior of the housing 1 has a pumping chamber 4 therein and is held together by bolts 7 passing through identical brackets 24, which also serve as tube clamps at the inlet and outlet holes. The halves 2 and 3 of the housing separate along mating surfaces 5 and 6 and such surfaces contain projections 8 and 9, which fit into corresponding recesses 10 and 11 for aligning the halves 2 and 3 in a predetermined relation to each other. The projections 8 and 9 and the recesses 10 and 11 are in identical places on the respective halves 2 and 3 such that each half is identical.
Fluid conducted through the pump in a fluid conducting plastic tube 12. The tube 12 is deformable and has a memory, that is to say that it will return to.its original shape after being deformed. The tube
12 extends through an inlet hole 13 and forms a loop in the pump cavity 4 before exiting from the housing through an outlet opening 14. The tube is positioned in the housing 1 on the profiled supporting face 15.
In order to provide the moving area of compression along the length of the compressible fluid conducting tube 12, a rotary structure 18 is disposed in the cavity 2. The rotary structure 18 includes a pair of axially spaced discs 1 9 and 20 mounted on a rotatable shaft 1 6. The rotatable shaft 1 6 is supported for rotation in housing 1 by means of metal ball bearings 21 and 22. A plurality of metal ball bearing-supported rollers 1 7 extend between the discs 1 9 and 20 and the axis of rotation of each of the rollers 17 is parallel to the axis of rotation of the shaft 21.
Each of the rollers 1 7 has an outer surface adapted to engage the tube 12 as the structure 1 8 rotates about the axis of the shaft 1 6 when driven by a suitable drive means, not shown here. The rollers may be produced from molybdenum sulphide filled nylon 6 which will result in minimum wear on the tube.
The bearings 21 and 22 are secured in their respective halves 2 and 3 of the housing 1 in a manner which is simple and which affords reliable and sturdy construction namely by shrink fitting whereby the metal bearing is secured in the plastic of the housing without the need for additional structural elements such as screws etc , which also simplifies the product and reduces production costs.
Other advantages accrue from this design as well as that of constant flow. The housing 1 being constructed of identical halves separable along surfaces lying in planes transverse to the axis of the shaft 16, lowers production costs, facilitates the stocking of replacement parts and has a simplicity which gives a sturdiness and reliability. The transparent nature of the housing 1 permits the user to be able to observe the condition of the tube. The profiled supporting face 1 5 and the loop of the tube 12 are symmetrical on either side of a plane through the axis of rotation of the structiire 18, permits rotation of the rotary structure 1 8 in either direction which permits the function of immediate reversal of fluid flow.
Because of the rotation of the rotating structure 1 8, and despite the fact that rollers 1 7 are free to roll on the surface of tube 12 and do so due to frictional forces and the careful selection of the profiled surface, forces may still be applied to the tube 12 which may cause it to 'snake' or slide on the profiled supporting face. This possibility in this pump is prevented by making the inlet 1 3 and outlet 14 adjustable to the diameter of the outer surface of the tube 12.
Further grooves may be provided in the two halves 2 and 3 to carry a U-ring and V-rings whereby it is possible to assemble the housing 1 and seal it such that the chamber 4 may be filled with a lubricant or cooling fluid to reduce wear on the tube 12.
Favoured pumps of this invention will have 4, 5 or 6 roller. A four roller system is particularly apt.
A six roller system is also particularly apt.
Claims (12)
1. A constant flow peristaltic pump comprising a housing having a rotatable shaft mounted on bearings therein, said housing having a profiled supporting face therein extending around the inner surface thereof, a fluid conducting tube positioned on said profiled supporting face in said housing forming a loop, a rotary structure including a pair of axially spaced support members positioned on either side of said profiled supporting face each support member being supported for rotation on said rotatable shaft in said housing, said rotary structure including at least four of axially mounted freelyrotatable rollers extending between said support members and engageable with said tube to compress same against the profiled supporting face to produce a constant flow delivery of fluid in response to the rotation of said support members.
2. A pump as claimed in claim 1 in which the profiled supporting face comprises three sections adjoining one another, the middle section being coaxial with the rotatable shaft, the other two of said sections being on either side the middle section each being in the form of an arcuate section eccentric with respect to said rotatable shaft, the radii of the three sections being so chosen that in the first section traversed by said rollers the tube is gradually compressed until it is closed at the point of contact with the roller, in said middle section said roller rolls on said tube to maintain said compression and in the third section said roller gradually releases said compression.
3. A pump as claimed in claim 2 comprising a rotary structure driven via a rotatable shaft by an external drive means, a flexible tube supported by a profiled supporting face, wherein the rotary structure comprises support members being mounted for rotation on the rotatable shaft having extending between them at least four freely-rotatable axially mounted rollers each capable of rolling on the tube along the profiled support-face, wherein the profiled tube supporting face and the rolling face of the roller are so arranged in relation to one another that in the first section of the profiled support face the roller rolls on the tube to gradually compress the tube until it is closed, in a second section the roller rolls on the tube to maintain the compression and in the third section the rollers roll to gradually release the compressing wherein the distance (r3) between the axis of the rotatable shaft and any point on the face of the first or third sections of the profiled support face is given by
r3 = r2 + (2 x tube wall thickness) + (D x tube bore) where r2 is the distance between the axis of rotatable shaft and the rolling surface of each roller, and D is a variable factor dependent on the displacement of the roller along the track, and the distance (r4) between the axis of the rotatable shaft and the second section of the profiled support face is given by
r4 = r2 + (2 x tube wall thickness).
4. A pump as claimed in any of claims 1 to 3 in which the rotary structure comprises a pair of axially spaced support members positioned on either side of said profiled supporting face each supporting member being supported for rotation on said rotatable shaft, said rotary structure includes four symmetrically placed axially mounted freely-rotatable rollers extending between said support means, capable of compressing the fluid containing tube in a manner described herein.
5. A pump as claimed in any of claims 2 to 4 wherein if x is the number of rollers, then the length of each arcuate section is defined by the angle subtended at their centre as
3600
x
6. A pump head for a constant flow peristaltic pump comprising a housing having a rotatable shaft mounted on bearings therein, said housing having a profiled supporting face therein extending around the inner surface thereof, a fluid conducting tube positioned on said profiled supporting face in said housing forming a loop, a rotary structure including a pair of axially spaced support members positioned on either side of said profiled supporting face each support member being supported for rotation on said rotatable shaft in said housing, said rotary structure including at least four of axially mounted freelyrotatable rollers extending between said support members and engageable with said tube to compress same against the profiled supporting face to produce a constant flow delivery of fluid in response to the rotation of said support members.
7. A pump head as claimed in claim 6 in which the profiled supporting face comprises three sections adjoining one another, the middle section being coaxial with the rotatable shaft, the other two of said sections being on either side the middle section each being in the form of an actuate eccentric with respect to said rotatable shaft, the radii of the three sections being so chosen that in the first section traversed by said rollers the tube is gradually compressed until it is closed at the point of contact with the roller, in said middle section said roller rolls on said tube to maintain said compression and in the third section said roller gradually releases said compression.
8. A pump head as claimed in claim 7 comprising a rotary structure driven via a rotatable shaft by an external drive means, a flexible tube supported by a profiled supporting face, wherein the rotary structure comprises support members being mounted for rotation on the rotatable shaft having extending between them at least four freely-rotatable axially mounted rollers each capable of rolling on the tube-along the profiled support-face, wherein the profiled tube supporting face and the rolling face of the roller are so arranged in relation to one another that in the first section of the profiled support face the roller rolls on the tube to gradually compress the tube until it is closed, in a second section the roller rolls on the tube to maintain the compression and in the third section the rollers roll to gradually release the compression, wherein the distance (razz ) between the axis of the rotatable shaft and any point on the face of the first or third sections of the profiled support face is given by
r3 = r2 + (2 x tube wall thickness) + (D x tube bore) where r2 is the distance between the axis of rotatable shaft and the rolling surface of each roller, and D is a variable factor dependent on the displacement of the roller along the track, and the distance (r4) between the axis of the rotatable shaft and the second section of the profiled support face is given by
r4 = r2 + (2 x tube wall thickness).
9. A pump head as claimed in any of claims 6 to 8 in which the rotary structure comprises a pair of axially spaced support members positioned on either side of said profiled supporting face each supporting member being supported for rotation on said rotatable shaft, said rotary structure includes four symmetrically placed axially mounted freely-rotatable rollers extending between said support means, capable of compressing the fluid containing tube in a manner described herein.
10. A pump head as claimed in any of claims 6 to 9 wherein if x is the number of rollers, then the length of each arcuate section is defined by the angle subtended at their centre defined as
3600
x
11. A pump as claimed in claim 1 substantially as described in any figure herein.
12. A pump head as claimed in claim 6 substantially as described in any figure herein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8016194A GB2076068B (en) | 1980-05-16 | 1980-05-16 | Peristaltic fluid-machines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8016194A GB2076068B (en) | 1980-05-16 | 1980-05-16 | Peristaltic fluid-machines |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2076068A true GB2076068A (en) | 1981-11-25 |
| GB2076068B GB2076068B (en) | 1983-11-09 |
Family
ID=10513457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8016194A Expired GB2076068B (en) | 1980-05-16 | 1980-05-16 | Peristaltic fluid-machines |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2076068B (en) |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2549909A1 (en) * | 1983-07-25 | 1985-02-01 | Fresenius Ag | ROLLER PUMP WITH PERISTALTIC MOVEMENT AND ROTOR FOR THIS PUMP |
| US4564342A (en) * | 1983-07-25 | 1986-01-14 | Fresenius Ag | Peristaltically operating roller pump and pump rotor therefor |
| WO1993024755A1 (en) * | 1992-06-03 | 1993-12-09 | Allergan, Inc. | Reduced pulsation tapered ramp pump head |
| US5433588A (en) * | 1993-12-15 | 1995-07-18 | Stryker Corporation | Peristaltic pump with one piece tubing insert and one piece cover |
| EP0694287A1 (en) * | 1994-07-28 | 1996-01-31 | Loctite Europa E.E.I.G. (E.W.I.V.) | Hose pump for dosing small amounts of liquid |
| EP0731275A1 (en) * | 1995-03-06 | 1996-09-11 | Epenhuysen Chemie N.V. | Peristaltic pump |
| US5641277A (en) * | 1995-06-13 | 1997-06-24 | Gondek; John T. | Peristalic pump |
| WO1998048172A1 (en) * | 1997-04-18 | 1998-10-29 | John Eastman Barnes | Improvements to impeller pumps |
| AU702646B2 (en) * | 1997-07-01 | 1999-02-25 | Daiichi Techno Co., Ltd. | Squeeze pump having improved rollers |
| US5928257A (en) * | 1996-09-13 | 1999-07-27 | Stryker Corporation | Surgical irrigation pump and tool system |
| US6039868A (en) * | 1995-02-09 | 2000-03-21 | First Medical, Inc. | Blood separator system |
| AU722618B2 (en) * | 1997-04-18 | 2000-08-10 | John Eastman Barnes | Improvements to impeller pumps |
| US6213740B1 (en) | 1997-04-18 | 2001-04-10 | John Eastman Barnes | Flexible impeller pump having a transparent safety cover |
| AU745412B2 (en) * | 1997-04-18 | 2002-03-21 | John Eastman Barnes | Impellers for impeller pumps |
| US6413059B1 (en) | 1998-02-19 | 2002-07-02 | University Of Melbourne | Linearized peristaltic pump |
| NL2000058C2 (en) * | 2006-04-21 | 2007-10-23 | Bredel Hose Pumps B V | Peristaltic pump. |
| EP1847711A1 (en) * | 2006-03-20 | 2007-10-24 | Bredel Hose Pumps B.V. | Peristaltic pump, method for manufacturing a hose therefor, and hose for such a pump |
| EP3017836A1 (en) * | 2014-11-04 | 2016-05-11 | Micrel Medical Devices S.A. | Pulseless rotary peristaltic pump |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6342061B1 (en) | 1996-09-13 | 2002-01-29 | Barry J. Kauker | Surgical tool with integrated channel for irrigation |
| CN103423134B (en) * | 2013-08-30 | 2015-07-29 | 常州远望流体科技有限公司 | Miniature peristaltic pump |
-
1980
- 1980-05-16 GB GB8016194A patent/GB2076068B/en not_active Expired
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4564342A (en) * | 1983-07-25 | 1986-01-14 | Fresenius Ag | Peristaltically operating roller pump and pump rotor therefor |
| FR2549909A1 (en) * | 1983-07-25 | 1985-02-01 | Fresenius Ag | ROLLER PUMP WITH PERISTALTIC MOVEMENT AND ROTOR FOR THIS PUMP |
| WO1993024755A1 (en) * | 1992-06-03 | 1993-12-09 | Allergan, Inc. | Reduced pulsation tapered ramp pump head |
| US5433588A (en) * | 1993-12-15 | 1995-07-18 | Stryker Corporation | Peristaltic pump with one piece tubing insert and one piece cover |
| EP0694287A1 (en) * | 1994-07-28 | 1996-01-31 | Loctite Europa E.E.I.G. (E.W.I.V.) | Hose pump for dosing small amounts of liquid |
| US5693020A (en) * | 1994-07-28 | 1997-12-02 | Loctite Europa E.E.I.G. (E.W.I.V.) | Hose pump for the exact dosing of small quantities of liquids |
| US6039868A (en) * | 1995-02-09 | 2000-03-21 | First Medical, Inc. | Blood separator system |
| EP0731275A1 (en) * | 1995-03-06 | 1996-09-11 | Epenhuysen Chemie N.V. | Peristaltic pump |
| NL9500442A (en) * | 1995-03-06 | 1996-10-01 | Elu Ijmond Techniek B V | Hose pump. |
| US5641277A (en) * | 1995-06-13 | 1997-06-24 | Gondek; John T. | Peristalic pump |
| US5928257A (en) * | 1996-09-13 | 1999-07-27 | Stryker Corporation | Surgical irrigation pump and tool system |
| US6213740B1 (en) | 1997-04-18 | 2001-04-10 | John Eastman Barnes | Flexible impeller pump having a transparent safety cover |
| AU722618B2 (en) * | 1997-04-18 | 2000-08-10 | John Eastman Barnes | Improvements to impeller pumps |
| WO1998048172A1 (en) * | 1997-04-18 | 1998-10-29 | John Eastman Barnes | Improvements to impeller pumps |
| AU745412B2 (en) * | 1997-04-18 | 2002-03-21 | John Eastman Barnes | Impellers for impeller pumps |
| US5954486A (en) * | 1997-07-01 | 1999-09-21 | Daiichi Techno Co., Ltd. | Squeeze pump having shrink fitter rollers |
| AU702646B2 (en) * | 1997-07-01 | 1999-02-25 | Daiichi Techno Co., Ltd. | Squeeze pump having improved rollers |
| US6413059B1 (en) | 1998-02-19 | 2002-07-02 | University Of Melbourne | Linearized peristaltic pump |
| EP1847711A1 (en) * | 2006-03-20 | 2007-10-24 | Bredel Hose Pumps B.V. | Peristaltic pump, method for manufacturing a hose therefor, and hose for such a pump |
| NL2000058C2 (en) * | 2006-04-21 | 2007-10-23 | Bredel Hose Pumps B V | Peristaltic pump. |
| US8157547B2 (en) | 2006-04-21 | 2012-04-17 | Bredel Hose Pumps B.V. | Peristaltic pump with flow control |
| EP3017836A1 (en) * | 2014-11-04 | 2016-05-11 | Micrel Medical Devices S.A. | Pulseless rotary peristaltic pump |
| US10100824B2 (en) | 2014-11-04 | 2018-10-16 | Micrel Medical Devices S.A. | Pulseless rotary peristaltic pump |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2076068B (en) | 1983-11-09 |
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| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |