CA1158477A - Medical roller pump improvement - Google Patents
Medical roller pump improvementInfo
- Publication number
- CA1158477A CA1158477A CA000374280A CA374280A CA1158477A CA 1158477 A CA1158477 A CA 1158477A CA 000374280 A CA000374280 A CA 000374280A CA 374280 A CA374280 A CA 374280A CA 1158477 A CA1158477 A CA 1158477A
- Authority
- CA
- Canada
- Prior art keywords
- hose
- bearing surface
- sidewalls
- rotor
- fluid passage
- 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
- F04B43/0009—Special features
- F04B43/0054—Special features particularities of the flexible members
- F04B43/0072—Special features particularities of the flexible members of tubular flexible members
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- External Artificial Organs (AREA)
- Reciprocating Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
Abstract
ABSTRACT
A roller pump particularly adapted for use in medical applications in which one or more hoses is compressed against an arcuate stator bearing surface by a plurality of rollers carried by a rotating rotor. The hoses define a fluid passage and are configured so as to reduce the amount of force necessary to close the internal passage. In this manner, leakage is greatly reduced or eliminated without requiring excessive force. In a preferred embodiment, the fluid passage is defined by first and second sidewalls which are generally spaced from each other and joined at first and second apices. Specifically, the sidewalls may be arcuate and, more specifically, elliptic with one of said sidewalls being positioned along the stator bearing surface with the other sidewall being engaged by the rotor during hose compression. Tabs may also be provided to extend from the apices for positioning of the fluid passage within the path of the rotor.
A roller pump particularly adapted for use in medical applications in which one or more hoses is compressed against an arcuate stator bearing surface by a plurality of rollers carried by a rotating rotor. The hoses define a fluid passage and are configured so as to reduce the amount of force necessary to close the internal passage. In this manner, leakage is greatly reduced or eliminated without requiring excessive force. In a preferred embodiment, the fluid passage is defined by first and second sidewalls which are generally spaced from each other and joined at first and second apices. Specifically, the sidewalls may be arcuate and, more specifically, elliptic with one of said sidewalls being positioned along the stator bearing surface with the other sidewall being engaged by the rotor during hose compression. Tabs may also be provided to extend from the apices for positioning of the fluid passage within the path of the rotor.
Description
llS8477 This invention relates to roller pumps and in particular roller pumps adapted for use in medical applications.
Roller pumps are known to the prior art and have wide application in the medical field. A typical application for such a pump is as a blood pump during hemodialysis, for example. Other applications are well known. The simplicity are reliability of roller pumps has resulted in their wide acceptance within the medical community.
Typically, medical roller pumps employ a stator having a bearing surface against which one or more hoses is compressed by a rotating rotor, the rotor engaging the hoses with two or more rollers. On rotation of the rotor, the fluid medium in the hose or hoses is transported in the direction of the rotor rotation.
Alternatively, the fluid may be presented to the pump under pressure such that rotation of the rotor causes the pump to serve as a measuring valve. In either instance, knowledge of the inner diameter of the hose or hoses and the rotational speed of the rotor provides a knowledge of the amount of fluid passed through the hose or hoses, which amount can be regulated ~y regulating the speed of the rotor.
Typical prior art roller pump hoses have been generally circular in cross-section. While this has proven satisfactory for many applications, many medical applications require a minimization or elimination of leakage within the hose past the rotor roller.
A complete closing of a circular cross-section hose often requires excessive forces. In addition, the relative geometry between the hose and rotor roller may, itself, prevent a complete closing of the hose. While variations in pump output resulting from these ~.
~15~477 causes may not be troublesome even in some medical contexts, in others they may be critical. For example, a roller pump being employed to regulate the dis-pensing of a medication is relied on to accurately dispense a predetermined amount of medication over a predetermined amount of time. Leakages which are not properly taken into account result in a departure from the desired medi-cation regimen. In other medical contexts, leakages can also result in critical inaccuracies in the assumed pump output.
The present invention provides an improvement to a medical roller pump of the type in which a stator provides a bearing surface against which a hose is compressed by a rotor as it rotates through 360. The hose is con-figured to reduce the amount of force necessary to totally close it on com-pression between the rotor and stator bearing surface.
Thus, in accordance with a broad aspect of the invention, there is provided, in a medical roller pump of the type having stator means, including a generally arcuate bearing surface, hose means lying along said bearing sur-face and rotor means having a contact surface and being rotatable through 360 for compressing said hose means against said bearing surface, the improvement wherein sald hose means comprises fluid passage means defined by first and second arcuate sidewalls meeting at first and second apices, one of said arcuate sidewalls lying along said bearing surface, and tab means extendlng from said apices and engageable with said stator means for positioning said fluid passage means in the path of said rotor means, the space between said apices being no greater than the height of said contact surface when said hose means is com-pressed against said bearing surface.
In a preferred embodiment, the sidewalls may be arcuate and, specific-ally, elllptic, with one of the sidewalls lying along the stator bearing surface.
In this manner, not only is the force necessary for complete closure of the fluid passage reduced but, also, the geometry of the system facilitates complete ~158~77 closure of the fluid passage by maintaining it within the path of the rotor.
The invention will now be further described in cOnJunction with the accompanying drawings, in which:
Figures 1 and 2 illustrate the circular cross-section -2a-~:~5~477 of a typical prior art rotor pump hose and its compression characteristics.
Figure 3 illustrates the cross-section of a preferred roller pump hose embodiment in accordance with the present invention.
Figure 4 illustrates the relationship between the hose of Figure 3 to a roller pump stator bearing surface.
Figure 5 illustrates the compression of a roller pump hose in accordance with the present invention.
Figure 1 illustrates the circular cross-section of a typical prior art roller pump hose 10 and its response to a compression force applied to its sidewalls. In Figure 1, the force is applied by plates 11 which are moved in the direction of the arrows 12. Under the influence of the movement of the plates 11, the sidewalls of the circular hose 10 move in the direction of the arrows 13 while the upper and lower walls move in the direction of the arrows 14. As the sidewalls approach each other, the force necessary to completely close the inner passage 15 of the hose 10 increases. In addition, movement of the upper and lower walls in the direction of the arrows 14 may take a portion of those walls past the upper or lower bounds of the plates 11. In this instance, complete closure of the inner passage 15 of hose 10 is virtually impossible.
Referring now to Figure 2, there is illustrated a typical roller pump geometry including a stator 16 having a bearing surface 17 and a chamber defined by upper and lower walls 17. A rotor 18 carries a roller 19 and is illustrated in Figure
Roller pumps are known to the prior art and have wide application in the medical field. A typical application for such a pump is as a blood pump during hemodialysis, for example. Other applications are well known. The simplicity are reliability of roller pumps has resulted in their wide acceptance within the medical community.
Typically, medical roller pumps employ a stator having a bearing surface against which one or more hoses is compressed by a rotating rotor, the rotor engaging the hoses with two or more rollers. On rotation of the rotor, the fluid medium in the hose or hoses is transported in the direction of the rotor rotation.
Alternatively, the fluid may be presented to the pump under pressure such that rotation of the rotor causes the pump to serve as a measuring valve. In either instance, knowledge of the inner diameter of the hose or hoses and the rotational speed of the rotor provides a knowledge of the amount of fluid passed through the hose or hoses, which amount can be regulated ~y regulating the speed of the rotor.
Typical prior art roller pump hoses have been generally circular in cross-section. While this has proven satisfactory for many applications, many medical applications require a minimization or elimination of leakage within the hose past the rotor roller.
A complete closing of a circular cross-section hose often requires excessive forces. In addition, the relative geometry between the hose and rotor roller may, itself, prevent a complete closing of the hose. While variations in pump output resulting from these ~.
~15~477 causes may not be troublesome even in some medical contexts, in others they may be critical. For example, a roller pump being employed to regulate the dis-pensing of a medication is relied on to accurately dispense a predetermined amount of medication over a predetermined amount of time. Leakages which are not properly taken into account result in a departure from the desired medi-cation regimen. In other medical contexts, leakages can also result in critical inaccuracies in the assumed pump output.
The present invention provides an improvement to a medical roller pump of the type in which a stator provides a bearing surface against which a hose is compressed by a rotor as it rotates through 360. The hose is con-figured to reduce the amount of force necessary to totally close it on com-pression between the rotor and stator bearing surface.
Thus, in accordance with a broad aspect of the invention, there is provided, in a medical roller pump of the type having stator means, including a generally arcuate bearing surface, hose means lying along said bearing sur-face and rotor means having a contact surface and being rotatable through 360 for compressing said hose means against said bearing surface, the improvement wherein sald hose means comprises fluid passage means defined by first and second arcuate sidewalls meeting at first and second apices, one of said arcuate sidewalls lying along said bearing surface, and tab means extendlng from said apices and engageable with said stator means for positioning said fluid passage means in the path of said rotor means, the space between said apices being no greater than the height of said contact surface when said hose means is com-pressed against said bearing surface.
In a preferred embodiment, the sidewalls may be arcuate and, specific-ally, elllptic, with one of the sidewalls lying along the stator bearing surface.
In this manner, not only is the force necessary for complete closure of the fluid passage reduced but, also, the geometry of the system facilitates complete ~158~77 closure of the fluid passage by maintaining it within the path of the rotor.
The invention will now be further described in cOnJunction with the accompanying drawings, in which:
Figures 1 and 2 illustrate the circular cross-section -2a-~:~5~477 of a typical prior art rotor pump hose and its compression characteristics.
Figure 3 illustrates the cross-section of a preferred roller pump hose embodiment in accordance with the present invention.
Figure 4 illustrates the relationship between the hose of Figure 3 to a roller pump stator bearing surface.
Figure 5 illustrates the compression of a roller pump hose in accordance with the present invention.
Figure 1 illustrates the circular cross-section of a typical prior art roller pump hose 10 and its response to a compression force applied to its sidewalls. In Figure 1, the force is applied by plates 11 which are moved in the direction of the arrows 12. Under the influence of the movement of the plates 11, the sidewalls of the circular hose 10 move in the direction of the arrows 13 while the upper and lower walls move in the direction of the arrows 14. As the sidewalls approach each other, the force necessary to completely close the inner passage 15 of the hose 10 increases. In addition, movement of the upper and lower walls in the direction of the arrows 14 may take a portion of those walls past the upper or lower bounds of the plates 11. In this instance, complete closure of the inner passage 15 of hose 10 is virtually impossible.
Referring now to Figure 2, there is illustrated a typical roller pump geometry including a stator 16 having a bearing surface 17 and a chamber defined by upper and lower walls 17. A rotor 18 carries a roller 19 and is illustrated in Figure
2 in maximum compressing engagement with a hose 10 of a normally ~58~7~
circular cross-section. As illustrated in Figure 2, roller 19 cannot cover the full extent of the chamber between the walls 17 because of the necessity to support the roller 19 on the rotor 18, as by arms 20 which extend to cooperate with a shaft 21 through the roller 19, the shaft 21 allowing the roller 19 to roll along the hose 10 on rotation of the rotor 18. Thus, as illustrated in Figure 2, on maximum engagement between the roller 19 and hose 10, the upper and lower portions of the hose 10 may extend beyond the roller 19 to result in unclosed portions of the hose 10 as indicated at 22. These unclosed portions 22 allow leakage past the roller 19 which leakage can be critical in certain applications, as noted above. The diameter of the circular hose 14 could be established such that its maximum dimension on complete compression is no larger than, or smaller than, the height of the roller 19. However, gravity would still act on such a hose to take it, at least partially, out of the path of a compressing surface of the roller l9--again resulting in leakage.
Figure 3 illustrates the cross-section of a roller pump hose in accordance with the present invention. A fluid passage 25 is defined by sidewalls 26 and 27 having major and minor axes.
The sidewalls 26 and 27 are spaced from each other (along the minor axis) and join at apices 28 (which are spaced from each other along the major axis). Tab members 29 extend from the apices 28 for reasons to be described more fully below. The compression force necessary to completely bring the sidewalls 26 and 27 into complete contact is minimized by minimizing the natural spacing therebetween. Howe~er, a preferred manufacturing process for the hose of the present invention is an extrusion process, which ii5~477 process necessitates some spacing between the sidewalls 26 and 27.
Other processes may be employed such that sidewalls 26 and 27 are independently formed but normally in contact with each other except under the influence of a fluid passing through the fluid passage 25. In the preferred extrusion manufacturing process, the sidewalls are generally arcuate and, more specifically, elliptic.
In use, the roller pump hose of Figure 3 is positioned within a roller pump stator with one of the sidewalls 26 or 27 being positioned against the stator bearing surface. This is illustrated in Figure 4 wherein the sidewall 27 lies along the bearing surface 17. Throughout the drawings, like reference numerals indicate functionally similar elements. As illustrated in Figure 4, the tabs 29 extend from the main body of the roller pump hose, at the apices 28, toward the stator walls 17. By engagement with the stator walls 17, the tabs 29 establish the position of the hose sidewalls 26 and, accordingly, the fluid passage 25. The distance between the apices 28 is established such that, on complete contact between the sidewalls 26 and 27, the apices 28 are spaced no farther apart than the height of the contact surface of the rotor roller 19. This is best illustrated in Figure 5 which illustrates the roller 19 in complete closing contact with a hose constructed in accordance with the present invention. Indeed, Figure 5 illustrates the cross-section of the preferred roller hose construction. However, within the context of the preferred extrusion manufacturing process, some spacing between the sidewalls 26 and 27 is necessary for a proper definition of those sidewalls. Any material capable of withstanding the ~5~477 continued compression between the roller 19 and stator bearing surface, as well as the fluid which flows through the fluid passage 25, may be employed in the practice of the present invention. Extruded silicone is a material suitable for many applications.
Obviously, many modifications and variations of the present invention are possible in light of the above teachings.
For example, the spacing between the hose apices 28 will be established in accordance with the contact height of the rotor roller l9 together with the spacing between the sidewalls 26 and 27. The length of the tabs 29 will be similarly dependent on the noted roller dimension as well as the spacing between the stator walls 17. The thickness of the sidewalls 26 and 27 is preferably as thin as possible while still being capable of withstanding repeated compressions between roller 19 and stator bearing surface 17. It is therefore to be understood that, within the scope of the appended claims, the invention may be practiced otherwise than as specifically described.
circular cross-section. As illustrated in Figure 2, roller 19 cannot cover the full extent of the chamber between the walls 17 because of the necessity to support the roller 19 on the rotor 18, as by arms 20 which extend to cooperate with a shaft 21 through the roller 19, the shaft 21 allowing the roller 19 to roll along the hose 10 on rotation of the rotor 18. Thus, as illustrated in Figure 2, on maximum engagement between the roller 19 and hose 10, the upper and lower portions of the hose 10 may extend beyond the roller 19 to result in unclosed portions of the hose 10 as indicated at 22. These unclosed portions 22 allow leakage past the roller 19 which leakage can be critical in certain applications, as noted above. The diameter of the circular hose 14 could be established such that its maximum dimension on complete compression is no larger than, or smaller than, the height of the roller 19. However, gravity would still act on such a hose to take it, at least partially, out of the path of a compressing surface of the roller l9--again resulting in leakage.
Figure 3 illustrates the cross-section of a roller pump hose in accordance with the present invention. A fluid passage 25 is defined by sidewalls 26 and 27 having major and minor axes.
The sidewalls 26 and 27 are spaced from each other (along the minor axis) and join at apices 28 (which are spaced from each other along the major axis). Tab members 29 extend from the apices 28 for reasons to be described more fully below. The compression force necessary to completely bring the sidewalls 26 and 27 into complete contact is minimized by minimizing the natural spacing therebetween. Howe~er, a preferred manufacturing process for the hose of the present invention is an extrusion process, which ii5~477 process necessitates some spacing between the sidewalls 26 and 27.
Other processes may be employed such that sidewalls 26 and 27 are independently formed but normally in contact with each other except under the influence of a fluid passing through the fluid passage 25. In the preferred extrusion manufacturing process, the sidewalls are generally arcuate and, more specifically, elliptic.
In use, the roller pump hose of Figure 3 is positioned within a roller pump stator with one of the sidewalls 26 or 27 being positioned against the stator bearing surface. This is illustrated in Figure 4 wherein the sidewall 27 lies along the bearing surface 17. Throughout the drawings, like reference numerals indicate functionally similar elements. As illustrated in Figure 4, the tabs 29 extend from the main body of the roller pump hose, at the apices 28, toward the stator walls 17. By engagement with the stator walls 17, the tabs 29 establish the position of the hose sidewalls 26 and, accordingly, the fluid passage 25. The distance between the apices 28 is established such that, on complete contact between the sidewalls 26 and 27, the apices 28 are spaced no farther apart than the height of the contact surface of the rotor roller 19. This is best illustrated in Figure 5 which illustrates the roller 19 in complete closing contact with a hose constructed in accordance with the present invention. Indeed, Figure 5 illustrates the cross-section of the preferred roller hose construction. However, within the context of the preferred extrusion manufacturing process, some spacing between the sidewalls 26 and 27 is necessary for a proper definition of those sidewalls. Any material capable of withstanding the ~5~477 continued compression between the roller 19 and stator bearing surface, as well as the fluid which flows through the fluid passage 25, may be employed in the practice of the present invention. Extruded silicone is a material suitable for many applications.
Obviously, many modifications and variations of the present invention are possible in light of the above teachings.
For example, the spacing between the hose apices 28 will be established in accordance with the contact height of the rotor roller l9 together with the spacing between the sidewalls 26 and 27. The length of the tabs 29 will be similarly dependent on the noted roller dimension as well as the spacing between the stator walls 17. The thickness of the sidewalls 26 and 27 is preferably as thin as possible while still being capable of withstanding repeated compressions between roller 19 and stator bearing surface 17. It is therefore to be understood that, within the scope of the appended claims, the invention may be practiced otherwise than as specifically described.
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a medical roller pump of the type having stator means, including a generally arcuate bearing surface, hose means lying along said bearing sur-face and rotor means having a contact surface and being rotatable through 360°
for compressing said hose means against said bearing surface, the improvement wherein said hose means comprises fluid passage means defined by first and second arcuate sidewalls meeting at first and second apices, one of said arcuate sidewalls lying along said bearing surface, and tab means extending from said apices and engageable with said stator means for positioning said fluid passage means in the path of said rotor means, the space between said apices being no greater than the height of said contact surface when said hose means is com-pressed against said bearing surface.
for compressing said hose means against said bearing surface, the improvement wherein said hose means comprises fluid passage means defined by first and second arcuate sidewalls meeting at first and second apices, one of said arcuate sidewalls lying along said bearing surface, and tab means extending from said apices and engageable with said stator means for positioning said fluid passage means in the path of said rotor means, the space between said apices being no greater than the height of said contact surface when said hose means is com-pressed against said bearing surface.
2. The medical roller pump of claim 1 wherein said first and second arcuate sidewalls are elliptical so that said fluid passage has a major axis and a minor axis, the major axis being generally parallel to said bearing surface.
3. The medical roller pump of claim 2 wherein said stator means com-prises first and second main walls generally perpendicular to said bearing surface, said tab means comprising first and second tab means each extending toward a different one of said first and second main walls.
4. The medical roller pump of claim 1, 2 or 3 wherein said hose is formed by extrusion, said sidewalls being generally spaced from each other.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13666280A | 1980-04-02 | 1980-04-02 | |
| US136,662 | 1980-04-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1158477A true CA1158477A (en) | 1983-12-13 |
Family
ID=22473820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000374280A Expired CA1158477A (en) | 1980-04-02 | 1981-03-31 | Medical roller pump improvement |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS56151057A (en) |
| CA (1) | CA1158477A (en) |
| DE (1) | DE3112837A1 (en) |
| FR (1) | FR2479914B1 (en) |
| NL (1) | NL8101619A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103405823A (en) * | 2013-08-27 | 2013-11-27 | 贾宇东 | High-flow-rate low-solubility oblate infusion tube |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4713063A (en) * | 1985-04-29 | 1987-12-15 | Beta Phase, Inc. | Intravenous tube and controller therefor |
| US4731069A (en) * | 1986-05-01 | 1988-03-15 | Beta Phase, Inc. | Intravenous tube and controller therefor |
| DE3909657A1 (en) * | 1989-03-23 | 1990-09-27 | Braun Melsungen Ag | PUMP HOSE FOR A PERISTALTIC PUMP |
| DE29600517U1 (en) * | 1996-01-13 | 1996-03-07 | Rehau Ag + Co, 95111 Rehau | Hose profile |
| AUPN970096A0 (en) * | 1996-05-06 | 1996-05-30 | Pumping Systems Technologies Pty Limited | Pseudo static peristaltic pump |
| DE10341571A1 (en) * | 2003-09-09 | 2005-04-07 | Micro Mechatronic Technologies Ag | Dosing pump esp. for small volumes has stator with internal helical elastic hose and stator partially compressing hose to form sea; |
| DE102013005456A1 (en) * | 2013-03-28 | 2014-10-02 | Jakob Maier | Deformable flow line section with increased service life and device with a flow line section |
| DE102014217358A1 (en) * | 2014-08-29 | 2016-03-03 | Leo Bühler | Portioning unit for portioning of flowable masses or powder, arrangement with several such portioning units and method for portioning of flowable masses or powder |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB453807A (en) * | 1934-11-03 | 1936-09-18 | Borys Apolczyn | Improvements in or relating to rotary pumps, compressors or the like |
| FR910783A (en) * | 1944-12-15 | 1946-06-18 | Pump for fluids of all kinds | |
| FR1114877A (en) * | 1954-08-10 | 1956-04-17 | Pump | |
| FR1291725A (en) * | 1961-03-17 | 1962-04-27 | Grenobloise Etude Appl | Improvements to roller and flexible tube pumps, in particular for medical use |
| GB1380812A (en) * | 1972-09-28 | 1975-01-15 | Chafer Ltd J W | Tubing and pumps incorporating such tubing |
-
1981
- 1981-03-31 DE DE19813112837 patent/DE3112837A1/en not_active Withdrawn
- 1981-03-31 CA CA000374280A patent/CA1158477A/en not_active Expired
- 1981-04-01 NL NL8101619A patent/NL8101619A/en not_active Application Discontinuation
- 1981-04-01 FR FR8106519A patent/FR2479914B1/en not_active Expired
- 1981-04-01 JP JP4736481A patent/JPS56151057A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103405823A (en) * | 2013-08-27 | 2013-11-27 | 贾宇东 | High-flow-rate low-solubility oblate infusion tube |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2479914A1 (en) | 1981-10-09 |
| JPS56151057A (en) | 1981-11-21 |
| DE3112837A1 (en) | 1982-01-07 |
| FR2479914B1 (en) | 1986-07-04 |
| NL8101619A (en) | 1981-11-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |