CA1258403A - Pressure surface for a peristaltic pump - Google Patents
Pressure surface for a peristaltic pumpInfo
- Publication number
- CA1258403A CA1258403A CA000488102A CA488102A CA1258403A CA 1258403 A CA1258403 A CA 1258403A CA 000488102 A CA000488102 A CA 000488102A CA 488102 A CA488102 A CA 488102A CA 1258403 A CA1258403 A CA 1258403A
- Authority
- CA
- Canada
- Prior art keywords
- flexible tubing
- plate member
- peristaltic pump
- tubing
- pump head
- 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.)
- Expired
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
-
- 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
- F04B43/1284—Means for pushing the backing-plate against 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The device of the present invention is a compression surface for use with a peristaltic pump which includes rollers which successively and repetitively compress flexible tubing in order to maintain flow of fluid through flexible tubing. In order for the flexible tubing to be compressed, a surface must be provided against which the rollers may compress the flexible tubing. The pressure surface of the present invention includes a plate member which has an arcuate surface against which the flexible tubing is compressed. The plate member is mounted on a pivot so that it may rotate with respect to the peristaltic pump head. A biasing element holds the plate member in operative engagement wiht the flexible tubing when the tubing is placed in operative engagement with the peristaltic pump head. In this manner, the arcuate pressure surface floats on the flexible tubing while, at the same time, exerting a constant force against the flexible tubing for maintaining accuracy of fluid flow.
The device of the present invention is a compression surface for use with a peristaltic pump which includes rollers which successively and repetitively compress flexible tubing in order to maintain flow of fluid through flexible tubing. In order for the flexible tubing to be compressed, a surface must be provided against which the rollers may compress the flexible tubing. The pressure surface of the present invention includes a plate member which has an arcuate surface against which the flexible tubing is compressed. The plate member is mounted on a pivot so that it may rotate with respect to the peristaltic pump head. A biasing element holds the plate member in operative engagement wiht the flexible tubing when the tubing is placed in operative engagement with the peristaltic pump head. In this manner, the arcuate pressure surface floats on the flexible tubing while, at the same time, exerting a constant force against the flexible tubing for maintaining accuracy of fluid flow.
Description
~5~3~03 Background of the Invention This invention relates to peristaltic pumps which utilize flexible tubing. More particularly this invention relates to an impeoved mounting system for the surface against which flexible tubing is compressed in a peristaltic pump.
The operability of peristaltic pumps depends on the successive and repetitive compression of a length of flexible tubing which causes the fluid within the length of flexible tubing to flow. Accuracy of fluid flow from a peristaltic pump can only be maintained if the amount of compression of the flexible tubing can be duplicated each time a new piece of flexible tubing is operatively engaged with a peristaltic pump head.
Problems have arisen in maintaining accurate fluid flow rates in peristaltic pumps because of the varying sizes and durometers of flexible tubing employed. The problem of maintaining accurate fluid flow rates is compounded with increasing viscosities of the fluid to be pumped. In addition if the flexible tubing is not properly positioned with respect to the pump rotor and the surface against which it is compressed or if the pump head has a slight eccentricity, the rotating pump head may bind against the flexi'ole tubing thus causing the rotation of the pump head to cease. Various attempts to overcome these problems have been made by adjustably mounting those portions of a peristaltic pump which repetitively and successively compress the flexible tubing. This adjustable mounting is designed to provide self correction for eccentricities in the pump head itself or irregularities in the flexible tubing. While improving performance these adjustable mounting systems have made peristaltic pump heads difficult to clean and difficult to manipulate when placing the flexible tubing in contact with the pump rotor.
The operability of peristaltic pumps depends on the successive and repetitive compression of a length of flexible tubing which causes the fluid within the length of flexible tubing to flow. Accuracy of fluid flow from a peristaltic pump can only be maintained if the amount of compression of the flexible tubing can be duplicated each time a new piece of flexible tubing is operatively engaged with a peristaltic pump head.
Problems have arisen in maintaining accurate fluid flow rates in peristaltic pumps because of the varying sizes and durometers of flexible tubing employed. The problem of maintaining accurate fluid flow rates is compounded with increasing viscosities of the fluid to be pumped. In addition if the flexible tubing is not properly positioned with respect to the pump rotor and the surface against which it is compressed or if the pump head has a slight eccentricity, the rotating pump head may bind against the flexi'ole tubing thus causing the rotation of the pump head to cease. Various attempts to overcome these problems have been made by adjustably mounting those portions of a peristaltic pump which repetitively and successively compress the flexible tubing. This adjustable mounting is designed to provide self correction for eccentricities in the pump head itself or irregularities in the flexible tubing. While improving performance these adjustable mounting systems have made peristaltic pump heads difficult to clean and difficult to manipulate when placing the flexible tubing in contact with the pump rotor.
-2- ~5~403 These problems of the prior art have been overcome by the present invention which encompasses a floating com~ression surface for use witn a peristaltic pump. The floating com?ression surface is biased into position witn respect to the pump rotor and against the rlexible tubing so that it applies a constant force on the flexible tubing as tne pump rotor turns. As those portions of the pump rotor repetitively and successively compress the flexible tubing,the surface against -~hich the flexible tubing is compressed will rotate on a pivot mount. This rotation will allow the compression surface to respond to any irregularities in the pump rotor or in the flexible tubing. In this manner flexible tubing of varying sizes and durometers 1~ may be used with a single pump head without affecting pump accuracy.
Summary of the Invention The device of the presen~ invention is a compression surface for use with a peristaltic pump.
Peristaltic pumps typically include rollers which successively and repetitively compress flexible tubing in order to maintain flow of fluid through flexiDle tuDinc. In order for the flexible tubing to be compressed a surface mus~ be provided against which the 2~ rollers may compress the flexi~le tuDing. The pressure surface oL tne present invention includes a plate member wnicn has an arcuate surface ayalnst which the flexi~le tu~ln~ is compressec. The plate member is ~ounted on â
plVO~ SO that it may rotate witn respect to tn-3C peris~alti~ pump heaa. Biasing means hold tne ?latememDer in operative engagement with the flexiDle tubins when tne tu~lng is placed in operative engagement with tne peristaltic pump hea~. In this manner the arcuate pressure surface floats on the flexible tu~ing while a' l~S~4~
the same time exerting a constant force against the flexible tubing for maintaining accuracy of fluid flow.
Brief Description of the Drawings The device of the present invention may be better understood by reference to the drawings wherein:
FIGURE 1 is a front elevational view of a peristaltic pump, incorporating the pressure surface of this invention.
FIGURE 2 is a side elevational view partially in section of the peristaltic pump of FIGURæ 1.
FIGURE 3 is a rear elevational view of the peristaltic pump of FIGURE 1.
FIGURE 4 is a view si.~ilar to FIGURE 3;
however, the pressure surface has been moved away from the pump rotor.
FIGURE 5 is a partial side elavational view taken at line 5-5 of FIGURE 4.
Detailed Description of the ~mbodiments Utilization of the device of the present invention may be best undeestood by reference to peristaltic pump, generally 20 as shown in FIGURE 1.
Pump 20 consists of four main parts; specifically tubing guide piece 12, flexible tubing 22, rotatable pulnp head 24 and pressure plate 10. As pump head 24 rotates, pressure wheels 26 contact flexible tubing 22 to repetitively and successively compress flexible tubing 22. Arcuate surface ll of pressure plate 10 operatively engages flexi`ole tubing 22 to provide a surface against which pressure wheels 26 may compress flexible tubing 22. If desire~ arcuate surface may be bordered by a fence 13 which acts to retain flexible tubing 22 in operative engagement with a pump head 24.
_4- ~5~40~
FIGURE 2 illustrates the mounting of pressure plate 10 with respect to pump head 24. A rotatable pivot bar 14 extends through pressure plate 10.
Pressure plate 10 is held in place on rotatable pivot bar 14 by set screw 36. As shown in FIGURES 3 and 5 arm 44 is attached to the opposite end of pivot bar 14.
An electrical switch 30 may oe placed on arm 44 to indicate the position of arm 44.
Pressure plate 10 is held in position by spring 23. Spring 28 consists of a spring retainer 64, a coil portion 62, a straight portion 58 and a bent-over portion 56. The action of straight portion 58 against cam finger 42 cau~ s arm 44 to be biased in a downward manner. This downward biasing of arm 44 causes pump pressure plate 10 to remain in contact with and provide a surface for the compression of flexible tubing 22.
OPeration When it is desired to operatively engage flexible tu~ing 22 With pump head 24 to operate peristaltic pump 20 pressure plate 10 is moved out of the way as shown in FIGURE 4. As shown in FIGURE 1 flexi~le tuDing 22 may now be threaded through tubing guide 12 and over pressure wheels 26. When flexi~le tubinc 22 is properly in place pressure plate lQ may be 2i moved Dack int~ position over flexible tUDing 22 ~v manuallv graspins knob 16 and moving it into contact hitr. flexi~le tu~ing 2~ If desired an automatic spring return ma~ be used. As can be best seen by comparing FIGURES 3 and 4 the moving of pressure plate 10 causes cam finger 42 to slide down straight portion 58 of spring 26. ~lectrical switch 30 will signal the ~osition of the pressure head 10.
When elec~rical power is applied througn lead 50 to motor 32 a rotating motion is imparted tnrough _5_ ~2~403 speed reducer 34 to deive axle 1~3. Drive axle 18 causes rotata~le pump head 24 to rotate. As rotatable pump head 24 rotates the incompressibility of fluid and the size and durometer of flexible tubing 22 will cause pressure plate 10 to move or float with respect to pivot bar 14 as the pump operates. Spring 28 provides a biasing force for pressure plate 10 against flexible tubing 22.
When the requisite amount of fluid has been pumped to the patient the rotation of rotatable pump head 24 may be stopped and ~lexible tubing 22 may be removed from the peristaltic pump 20. This removal of flexible tubing 22 is accomplished by grasping knob 16 and moving pressure plate lO up and away from flexible tubing 22 to the position shown in FIGU~E 4. As pressure plate lO is moved away from rotatable pump head 24 cam finger 42 slides up along the straight portion of spring 28. ~hen cam finger 42 reaches bent-over portion 56 of spring 28 the downward force felt at bent-over portion 56 caused by the action of coil portion 62, held in place by spring retainer 64, will allow pressure plate lO to remain in the open position. If the automatic return is used plate lO will return to the closed position when released. Closing of pressure plate lO again is easily effected by grasping ~nob 16 and moving pressure plate lO back into contact with flexible tubing 22.
In this manner pressure surface lO around rotatable peristaltic pump head 24 is allo-~ed to rotate on the pivot bar 14 in response to any eccentricities in the rotating pump head or irregularities in the flexible tubing.
The foregoing invention can now be practiced by those skilled in the art. Such skilled persons will know that the invention is not necessarily restricted to l~:S~340;~
the embodiments presented herein. The scope of the invention is to be defined by the terms of the following claims, as given meaning by the preceding description.
Summary of the Invention The device of the presen~ invention is a compression surface for use with a peristaltic pump.
Peristaltic pumps typically include rollers which successively and repetitively compress flexible tubing in order to maintain flow of fluid through flexiDle tuDinc. In order for the flexible tubing to be compressed a surface mus~ be provided against which the 2~ rollers may compress the flexi~le tuDing. The pressure surface oL tne present invention includes a plate member wnicn has an arcuate surface ayalnst which the flexi~le tu~ln~ is compressec. The plate member is ~ounted on â
plVO~ SO that it may rotate witn respect to tn-3C peris~alti~ pump heaa. Biasing means hold tne ?latememDer in operative engagement with the flexiDle tubins when tne tu~lng is placed in operative engagement with tne peristaltic pump hea~. In this manner the arcuate pressure surface floats on the flexible tu~ing while a' l~S~4~
the same time exerting a constant force against the flexible tubing for maintaining accuracy of fluid flow.
Brief Description of the Drawings The device of the present invention may be better understood by reference to the drawings wherein:
FIGURE 1 is a front elevational view of a peristaltic pump, incorporating the pressure surface of this invention.
FIGURE 2 is a side elevational view partially in section of the peristaltic pump of FIGURæ 1.
FIGURE 3 is a rear elevational view of the peristaltic pump of FIGURE 1.
FIGURE 4 is a view si.~ilar to FIGURE 3;
however, the pressure surface has been moved away from the pump rotor.
FIGURE 5 is a partial side elavational view taken at line 5-5 of FIGURE 4.
Detailed Description of the ~mbodiments Utilization of the device of the present invention may be best undeestood by reference to peristaltic pump, generally 20 as shown in FIGURE 1.
Pump 20 consists of four main parts; specifically tubing guide piece 12, flexible tubing 22, rotatable pulnp head 24 and pressure plate 10. As pump head 24 rotates, pressure wheels 26 contact flexible tubing 22 to repetitively and successively compress flexible tubing 22. Arcuate surface ll of pressure plate 10 operatively engages flexi`ole tubing 22 to provide a surface against which pressure wheels 26 may compress flexible tubing 22. If desire~ arcuate surface may be bordered by a fence 13 which acts to retain flexible tubing 22 in operative engagement with a pump head 24.
_4- ~5~40~
FIGURE 2 illustrates the mounting of pressure plate 10 with respect to pump head 24. A rotatable pivot bar 14 extends through pressure plate 10.
Pressure plate 10 is held in place on rotatable pivot bar 14 by set screw 36. As shown in FIGURES 3 and 5 arm 44 is attached to the opposite end of pivot bar 14.
An electrical switch 30 may oe placed on arm 44 to indicate the position of arm 44.
Pressure plate 10 is held in position by spring 23. Spring 28 consists of a spring retainer 64, a coil portion 62, a straight portion 58 and a bent-over portion 56. The action of straight portion 58 against cam finger 42 cau~ s arm 44 to be biased in a downward manner. This downward biasing of arm 44 causes pump pressure plate 10 to remain in contact with and provide a surface for the compression of flexible tubing 22.
OPeration When it is desired to operatively engage flexible tu~ing 22 With pump head 24 to operate peristaltic pump 20 pressure plate 10 is moved out of the way as shown in FIGURE 4. As shown in FIGURE 1 flexi~le tuDing 22 may now be threaded through tubing guide 12 and over pressure wheels 26. When flexi~le tubinc 22 is properly in place pressure plate lQ may be 2i moved Dack int~ position over flexible tUDing 22 ~v manuallv graspins knob 16 and moving it into contact hitr. flexi~le tu~ing 2~ If desired an automatic spring return ma~ be used. As can be best seen by comparing FIGURES 3 and 4 the moving of pressure plate 10 causes cam finger 42 to slide down straight portion 58 of spring 26. ~lectrical switch 30 will signal the ~osition of the pressure head 10.
When elec~rical power is applied througn lead 50 to motor 32 a rotating motion is imparted tnrough _5_ ~2~403 speed reducer 34 to deive axle 1~3. Drive axle 18 causes rotata~le pump head 24 to rotate. As rotatable pump head 24 rotates the incompressibility of fluid and the size and durometer of flexible tubing 22 will cause pressure plate 10 to move or float with respect to pivot bar 14 as the pump operates. Spring 28 provides a biasing force for pressure plate 10 against flexible tubing 22.
When the requisite amount of fluid has been pumped to the patient the rotation of rotatable pump head 24 may be stopped and ~lexible tubing 22 may be removed from the peristaltic pump 20. This removal of flexible tubing 22 is accomplished by grasping knob 16 and moving pressure plate lO up and away from flexible tubing 22 to the position shown in FIGU~E 4. As pressure plate lO is moved away from rotatable pump head 24 cam finger 42 slides up along the straight portion of spring 28. ~hen cam finger 42 reaches bent-over portion 56 of spring 28 the downward force felt at bent-over portion 56 caused by the action of coil portion 62, held in place by spring retainer 64, will allow pressure plate lO to remain in the open position. If the automatic return is used plate lO will return to the closed position when released. Closing of pressure plate lO again is easily effected by grasping ~nob 16 and moving pressure plate lO back into contact with flexible tubing 22.
In this manner pressure surface lO around rotatable peristaltic pump head 24 is allo-~ed to rotate on the pivot bar 14 in response to any eccentricities in the rotating pump head or irregularities in the flexible tubing.
The foregoing invention can now be practiced by those skilled in the art. Such skilled persons will know that the invention is not necessarily restricted to l~:S~340;~
the embodiments presented herein. The scope of the invention is to be defined by the terms of the following claims, as given meaning by the preceding description.
Claims
1. A peristaltic pump comprising:
- a length of flexible tubing;
- a rotatable pump head having a plurality of pressure wheels constructed and arranged for repetitive and successive compression of said flexible tubing;
- a plate member having an arcuate surface against which said flexible tubing may be compressed by said pressure wheels;
- a pivot member operatively associated with said plate member to position said plate member with respect to said rotatable pump head and said flexible tubing; and - means for resiliently biasing said arcuate surface against said compressible tubing; said means including a mechanical spring operatively associated with said plate member to retain said plate member in an open position; whereby when said plate member is rotated on said pivot member into a position for operative engagement with said flexible tubing, said means for resiliently biasing will hold said arcuate surface in operative engagement with said flexible tubing.
- a length of flexible tubing;
- a rotatable pump head having a plurality of pressure wheels constructed and arranged for repetitive and successive compression of said flexible tubing;
- a plate member having an arcuate surface against which said flexible tubing may be compressed by said pressure wheels;
- a pivot member operatively associated with said plate member to position said plate member with respect to said rotatable pump head and said flexible tubing; and - means for resiliently biasing said arcuate surface against said compressible tubing; said means including a mechanical spring operatively associated with said plate member to retain said plate member in an open position; whereby when said plate member is rotated on said pivot member into a position for operative engagement with said flexible tubing, said means for resiliently biasing will hold said arcuate surface in operative engagement with said flexible tubing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US63859784A | 1984-08-07 | 1984-08-07 | |
| US638,597 | 1991-01-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1258403A true CA1258403A (en) | 1989-08-15 |
Family
ID=24560677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000488102A Expired CA1258403A (en) | 1984-08-07 | 1985-08-06 | Pressure surface for a peristaltic pump |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0173075B1 (en) |
| JP (1) | JPH06103029B2 (en) |
| KR (1) | KR940007757B1 (en) |
| AU (1) | AU592760B2 (en) |
| CA (1) | CA1258403A (en) |
| DE (1) | DE3580074D1 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5057081A (en) * | 1990-06-15 | 1991-10-15 | Sherwood Medical Company | Peristaltic infusion device |
| US5158528A (en) * | 1990-06-15 | 1992-10-27 | Sherwood Medical Company | Peristaltic infusion device and charger unit |
| US5133650A (en) * | 1990-06-15 | 1992-07-28 | Sherwood Medical Company | Infusion device rotor shield |
| US5181842A (en) * | 1990-06-15 | 1993-01-26 | Sherwood Medical Company | Peristaltic infusion device |
| US5127908A (en) * | 1990-06-15 | 1992-07-07 | Sherwood Medical Company | Peristaltic infusion device |
| US5147312A (en) * | 1990-06-15 | 1992-09-15 | Sherwood Medical Company | Peristaltic infusion device drip chamber yoke |
| KR100299269B1 (en) * | 1999-08-30 | 2001-09-22 | 황해웅 | A manufacturing device &method for mixing fiber by using brading weaving |
| KR101454468B1 (en) * | 2013-11-21 | 2014-10-24 | 서해영 | Discharge improved disinfectant nebulizer using peristaltic pump |
| US10519123B2 (en) * | 2016-02-04 | 2019-12-31 | Grasim Industries Limited | Process for preparation of an aromatic N-glycidylamine |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1562024A (en) * | 1968-01-05 | 1969-04-04 | ||
| GB1344825A (en) * | 1971-05-19 | 1974-01-23 | Vendaid Ltd | Machines for dispensing measured quantities of liquids |
| US4165954A (en) * | 1975-08-11 | 1979-08-28 | Corning Glass Works | Linear peristaltic pump having pivotal pump arm |
| JPS5565538U (en) * | 1978-10-31 | 1980-05-06 | ||
| DE2855634A1 (en) * | 1978-12-22 | 1980-06-26 | Ara Werk Kraemer Gmbh & Co | METHOD AND DEVICE FOR PUMPING, IN PARTICULAR DOSING, FROM PASTOISES TO LIQUID MEASURES BY MEANS OF A HOSE PUMP |
| US4493224A (en) * | 1982-06-04 | 1985-01-15 | Eaton Corporation | Remote manual shifting mechanism |
-
1985
- 1985-07-25 AU AU45368/85A patent/AU592760B2/en not_active Ceased
- 1985-07-25 DE DE8585109278T patent/DE3580074D1/en not_active Expired - Lifetime
- 1985-07-25 EP EP85109278A patent/EP0173075B1/en not_active Expired - Lifetime
- 1985-08-06 KR KR1019850005651A patent/KR940007757B1/en not_active IP Right Cessation
- 1985-08-06 CA CA000488102A patent/CA1258403A/en not_active Expired
- 1985-08-06 JP JP60171945A patent/JPH06103029B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| AU4536885A (en) | 1986-02-13 |
| JPS6143290A (en) | 1986-03-01 |
| KR940007757B1 (en) | 1994-08-24 |
| AU592760B2 (en) | 1990-01-25 |
| KR860001954A (en) | 1986-03-24 |
| EP0173075A3 (en) | 1986-03-19 |
| JPH06103029B2 (en) | 1994-12-14 |
| EP0173075B1 (en) | 1990-10-10 |
| EP0173075A2 (en) | 1986-03-05 |
| DE3580074D1 (en) | 1990-11-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |