WO1993024755A1 - Reduced pulsation tapered ramp pump head - Google Patents

Reduced pulsation tapered ramp pump head Download PDF

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Publication number
WO1993024755A1
WO1993024755A1 PCT/US1993/005064 US9305064W WO9324755A1 WO 1993024755 A1 WO1993024755 A1 WO 1993024755A1 US 9305064 W US9305064 W US 9305064W WO 9324755 A1 WO9324755 A1 WO 9324755A1
Authority
WO
WIPO (PCT)
Prior art keywords
tube
roller
assembly head
peristaltic pump
pump according
Prior art date
Application number
PCT/US1993/005064
Other languages
French (fr)
Inventor
Frank Zanger
Tim Surber
Susanne Roslon
Original Assignee
Allergan, Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Allergan, Inc. filed Critical Allergan, Inc.
Priority to JP50078294A priority Critical patent/JP3380874B2/en
Priority to EP93914211A priority patent/EP0643808B1/en
Priority to DE69316360T priority patent/DE69316360T2/en
Publication of WO1993024755A1 publication Critical patent/WO1993024755A1/en

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
    • 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

Definitions

  • the present invention generally relates to peristaltic pumps and more particularly to precision peristaltic pumps, particularly suitable for the simultaneous removal and replacement of fluids in an eye cavity during ophthalmic surgery as, for example, for the removal of cataracts.
  • Cataracts within the lens may be broken up by cutting apparatus or by ultrasonic apparatus and the fractured material aspirated, together with a quantity of aqueous fluid in the eye chamber.
  • the aqueous fluid is simultaneously replaced in order to maintain a normal pressure in the eye.
  • pressure may be controlled by a pressure regulation device, greater pressure stability may be assured through the use of a pump having minimal back pressure or pump pulsations.
  • the present invention provides a peristaltic pump having significantly reduced pump pulsations and therefore particularly suitable for use in surgical procedures such as those hereinabove described.
  • a peristaltic pump in accordance with the present invention generally includes a plurality of tube compression means for compressing and sealing a collapsible and resilient tube.
  • Housing means is provided for guiding the collapsible and resilient tube to and from the tube compression means and means are provided for causing the plurality of tube com ⁇ pression means to successively contact, gradually compress and seal the compressible and resilient tube and thereafter gradually uncompress the tube in order to move a fluid through the tube in one direction without creating substantial fluid back pressure in the opposite direction.
  • the plurality of tube compres ⁇ sion means may comprise a plurality of rollers and the means for causing the plurality of tube compression means to contact, compress and seal the tube comprises a pump arm, having an arcuate surface, and mounted to the housing means in a position enabling the rollers to contact, compress and seal the tube.
  • the peristaltic pump in accordance with the present invention may further include assembly head means for supporting the plural- ity of rollers in a circular pattern about an assembly head axis with each roller having a rotation axis generally parallel to the assembly head axis.
  • the arcuate surface is configured and the pump arm position with respect to the assembly head so that as the assembly head is rotated, each roller successively contacts the tube, gradually compresses and seals the tube during an approximate 45° rotation of the assembly head. Additionally, the arcuate surface is configured with the pump arm position with respect to the assembly head so that each roller successively releases a tube during a rotation of the assembly head about 45°.
  • the arcuate surface is configured and the pump arm positioned with respect to the assembly head so that each roller maintains a sealing engagement with the tube during approximately a 45° rotation of the assembly head.
  • each roller may include a specific circumferential surface thereon.
  • each roller may have an inside diameter that is smaller than a roller diameter at each end of the roller, and this smaller diameter may be constant between end diameters on each roller, with the end diameters interconnected with the constant diameter by an arcuate surface.
  • the present invention may also include a collapsible resilient tube which includes means for preventing movement of the tube itself through the housing means.
  • the means for preventing movement of the tube may include at least one collar disposed on the tube having a diam ⁇ eter sufficient to prevent entry of the collar into the housing means.
  • Figure 1 is a perspective view of an assembled peristaltic pump in accordance with the present invention.
  • Figure 2 is a perspective exploded view of the peristaltic pump shown in Figure 1;
  • Figure 3 is a cross-section view of the peristal ⁇ tic pump in accordance with the present invention showing a plurality of rollers for compressing a resilient tube against a pump arm arcuate surface;
  • Figure 4 is a cross-section of a prior art peristaltic pump showing the relationship between the rollers and the pump arm arcuate surface;
  • Figure 5 is a cross-section view of a roller in accordance with the present invention taken along the line 5-5 shown in Figure 3;
  • Figure 5a is a cross-section veiw of a prior art roller for a peristaltic pump showing incomplete sealing of a tube
  • Figure 6 is a plot of vacuum pressure as a function of time for both a prior art peristaltic pump and a peristaltic pump in accordance with the present invention, showing in comparison a significant reduc ⁇ tion in back pressure during operation of the peristaltic pump made in accordance with the present invention operating at flow rate of about 10 ccs per minute
  • Figure 7 is a plot similar to the plot shown in
  • FIG. 6 showing the vacuum as a function of time for both prior art pumps and a pump in accordance with the present invention at a flow rate of about 40 ccs per minute.
  • a peristaltic pump 10 in accordance with the present invention generally including an assembly head 26 which provides a means for supporting a plurality of rollers 28 with the latter providing compression means for compressing and sealing a collapsible and resil ⁇ ient tube 32 against an arcuate surface 34 on a pump arm 36.
  • the pump arm 36 is pivotally mounted to a housing 40 by means of a pin 42 and washer 44 for enabling movement thereof to facilitate insertion and removal of the tube 32.
  • Apertures 46 48 in the housing 40 enable the housing to provide means for guiding the collapsible and resilient tube 32 to and from the arcuate surface 34 and rollers 28.
  • a spring 52 loaded latch 54 pivotally mounted to the pump arm 36 by a pin 55 enables locking of the pump arm 36 to the housing after insertion of the tube 32 through the apertures 46 and 48, and during opera ⁇ tion of the pump. This locking is enabled by the tongue 56 which snaps over a recess 58 in the housing 40, securing a front housing wall 60 between the tongue 56 and a rear portion 62 of the latch 54.
  • the assembly head 26 is rotatably attached to the housing 40 by way of an axle 68 which passes through bearings 70, 72, a bore 76 in the housing 40 and a hub 78 and coupling 80.
  • the axle 68 is retained in position by a clip 82 in a conventional manner along with a set screw 86.
  • the pump arm 36 with arcuate surface 34 is positioned with respect to the assembly head rollers 28 to pro ⁇ vide a means for gradually compressing and sealing the collapsible and resilient tube 32 and thereafter grad- ually uncompressing the tube 32 in order to move a fluid (not shown) through the tube 32 in a direction indicated by the rotation area 92 without creating substantial fluid back pressure in a direction oppo ⁇ site that of the area 92.
  • the spatial relationship provided by the mounting of the assembly head 26 and arcuate surface 32 is more clearly shown in Figure 3.
  • each roller 28 includes a roller axis 100 which is generally parallel to the assembly head axis 96.
  • the arcuate surface 34 is configured and the pump arm 36 positioned with respect to the assembly head 26 so that as the assembly head 26 is rotated in the direction of arrow 92, each roller 28 successively contacts the tube 32, gradually compresses and seals the tube 32 during approximately a 45° rotation of the assembly head 26.
  • each roller to gradually release the tube during a rotation of the assembly head 26 of about 45°. This configuration also enables each roller to remain in a sealing engagement with the tube 32 during approximately a 90° rotation of the assembly head 26.
  • each roller 28 has an inside diameter 118 which is smaller than roller diameters 120 at each end 122, 124 of each roller. This inside diameter 118 is constant between the end diameters 120 and the end diameters 120 are interconnected with the inside diameter 118 by arcuate surface 126.
  • This generally U-shaped cross-section of the roller provides for uniform sealing tube 32 as shown in Figure 5 which is not possible with a flat or uniform diameter roller 130, see Figure 5a.
  • the prior art roller 130 provides incomplete sealing of a tube 132 because the circular nature of the tube inside diameter results in end voids 134 136 unless sufficient pressure is exerted to collapsible the tube side 138.
  • rollers 112 may lead to excessive tube wear and may further result in a excess loading on the assembly head 104 and rollers 112.
  • collars 144 146 may be at- tached or molded into the tube at a spaced apart distance from one another in order that each collar is positioned abutting the housing front 40 upon assembly of the tube 32 into the housing 40 and around the rollers 28.
  • the collar diameter is chosen in order to prevent entry of the collar into the housing means 40. It has been found that reliable and efficient perfor ⁇ mance of the pump is provided when the compressible and resilient tube is formed from silicon having a hardness of about 55 durometers, Shore A, platinum or peroxide cure method, and a typical tubing size is three-eighth inch.
  • the tube is formed from a peroxide cure silicon, said cure being well known in the art.
  • This size tube enables pumping volumes of up to about 40 cc/minute when the assembly head is rotated at up to about 75 rpm.
  • Curves A in both Figures 6 and 7 represent the prior art pump performance while Curves B in Figures 6 and 7 represent the results of a peristaltic pump configured in accordance with the present invention.
  • the vacuum variation on the intake of the pump 10 in accordance with the present invention operating at about 10 ccs per minute is less than plus or minus 4 mm Hg at a vacuum of about 18 mm Hg.
  • This is to be compared with the vacuum variation on the intake of the prior art pump 102 which is about plus or minus 8 mm Hg at 10 ccs per minute.
  • the change in back pressure of the pump 10 in accordance with the present invention over the prior art pump 102 is a factor of two.

Abstract

A peristaltic pump includes a plurality of rollers for compressing and sealing a collapsible and resilient tube. A housing and a pump arm with a specific arcuate surface and position with respect to the housing enable the successive contact and gradual compression of the rollers with the tube in a manner for moving a fluid through the tube in one direction without creating substantial fluid back pressure in an opposite direction.

Description

REDϋCED PULSATION TAPERED RAMP PUMP HEAD
The present invention generally relates to peristaltic pumps and more particularly to precision peristaltic pumps, particularly suitable for the simultaneous removal and replacement of fluids in an eye cavity during ophthalmic surgery as, for example, for the removal of cataracts.
The necessity for precisely controlling pressure in the eye during surgery is well-known. During surgery on normally pressurized eyes, instruments are passed through small incisions of the cornea in order to access and remove opaque cataract material clouding the lens.
Cataracts within the lens may be broken up by cutting apparatus or by ultrasonic apparatus and the fractured material aspirated, together with a quantity of aqueous fluid in the eye chamber.
The aqueous fluid is simultaneously replaced in order to maintain a normal pressure in the eye.
While pressure may be controlled by a pressure regulation device, greater pressure stability may be assured through the use of a pump having minimal back pressure or pump pulsations.
Severe reductions in the eye pressure will result in collapse of the eye chamber, but aside from these traumatic results, the maintenance of proper pressure within an eye during surgical procedures is important to preserve and stabilize the spatial relationships of the intraocular tissues. Thus, variations of pressure during an operation may impair the surgeon's ability to observe and operate on intraocular tissues.
The present invention provides a peristaltic pump having significantly reduced pump pulsations and therefore particularly suitable for use in surgical procedures such as those hereinabove described.
SUMMARY OF THE INVENTION
A peristaltic pump in accordance with the present invention generally includes a plurality of tube compression means for compressing and sealing a collapsible and resilient tube. Housing means is provided for guiding the collapsible and resilient tube to and from the tube compression means and means are provided for causing the plurality of tube com¬ pression means to successively contact, gradually compress and seal the compressible and resilient tube and thereafter gradually uncompress the tube in order to move a fluid through the tube in one direction without creating substantial fluid back pressure in the opposite direction.
More particularly, the plurality of tube compres¬ sion means may comprise a plurality of rollers and the means for causing the plurality of tube compression means to contact, compress and seal the tube comprises a pump arm, having an arcuate surface, and mounted to the housing means in a position enabling the rollers to contact, compress and seal the tube.
Still more particularly, the peristaltic pump in accordance with the present invention may further include assembly head means for supporting the plural- ity of rollers in a circular pattern about an assembly head axis with each roller having a rotation axis generally parallel to the assembly head axis.
Specifically, the arcuate surface is configured and the pump arm position with respect to the assembly head so that as the assembly head is rotated, each roller successively contacts the tube, gradually compresses and seals the tube during an approximate 45° rotation of the assembly head. Additionally, the arcuate surface is configured with the pump arm position with respect to the assembly head so that each roller successively releases a tube during a rotation of the assembly head about 45°.
The arcuate surface is configured and the pump arm positioned with respect to the assembly head so that each roller maintains a sealing engagement with the tube during approximately a 45° rotation of the assembly head.
In order for uniformly sealing the tube as the roller compresses the tubing, each roller may include a specific circumferential surface thereon. Particu- larly, each roller may have an inside diameter that is smaller than a roller diameter at each end of the roller, and this smaller diameter may be constant between end diameters on each roller, with the end diameters interconnected with the constant diameter by an arcuate surface.
In combination, the present invention may also include a collapsible resilient tube which includes means for preventing movement of the tube itself through the housing means. Particularly, the means for preventing movement of the tube may include at least one collar disposed on the tube having a diam¬ eter sufficient to prevent entry of the collar into the housing means.
BRIEF DESCRIPTION OF THE DRAWINGS
The advantages and features of the present invention will be better understood by the following description when considered in conjunction with the accompanying drawings in which:
Figure 1 is a perspective view of an assembled peristaltic pump in accordance with the present invention;
Figure 2 is a perspective exploded view of the peristaltic pump shown in Figure 1;
Figure 3 is a cross-section view of the peristal¬ tic pump in accordance with the present invention showing a plurality of rollers for compressing a resilient tube against a pump arm arcuate surface;
Figure 4 is a cross-section of a prior art peristaltic pump showing the relationship between the rollers and the pump arm arcuate surface;
Figure 5 is a cross-section view of a roller in accordance with the present invention taken along the line 5-5 shown in Figure 3;
Figure 5a is a cross-section veiw of a prior art roller for a peristaltic pump showing incomplete sealing of a tube; Figure 6 is a plot of vacuum pressure as a function of time for both a prior art peristaltic pump and a peristaltic pump in accordance with the present invention, showing in comparison a significant reduc¬ tion in back pressure during operation of the peristaltic pump made in accordance with the present invention operating at flow rate of about 10 ccs per minute; and Figure 7 is a plot similar to the plot shown in
Figure 6 showing the vacuum as a function of time for both prior art pumps and a pump in accordance with the present invention at a flow rate of about 40 ccs per minute. DETAILED DESCRIPTION OF THE DRAWINGS
Turning now to Figures 1 and 2, there is shown a peristaltic pump 10 in accordance with the present invention generally including an assembly head 26 which provides a means for supporting a plurality of rollers 28 with the latter providing compression means for compressing and sealing a collapsible and resil¬ ient tube 32 against an arcuate surface 34 on a pump arm 36.
The pump arm 36 is pivotally mounted to a housing 40 by means of a pin 42 and washer 44 for enabling movement thereof to facilitate insertion and removal of the tube 32. Apertures 46 48 in the housing 40 enable the housing to provide means for guiding the collapsible and resilient tube 32 to and from the arcuate surface 34 and rollers 28.
A spring 52 loaded latch 54 pivotally mounted to the pump arm 36 by a pin 55 enables locking of the pump arm 36 to the housing after insertion of the tube 32 through the apertures 46 and 48, and during opera¬ tion of the pump. This locking is enabled by the tongue 56 which snaps over a recess 58 in the housing 40, securing a front housing wall 60 between the tongue 56 and a rear portion 62 of the latch 54.
The assembly head 26 is rotatably attached to the housing 40 by way of an axle 68 which passes through bearings 70, 72, a bore 76 in the housing 40 and a hub 78 and coupling 80. The axle 68 is retained in position by a clip 82 in a conventional manner along with a set screw 86.
As will be hereinafter discussed in great detail, the pump arm 36 with arcuate surface 34 is positioned with respect to the assembly head rollers 28 to pro¬ vide a means for gradually compressing and sealing the collapsible and resilient tube 32 and thereafter grad- ually uncompressing the tube 32 in order to move a fluid (not shown) through the tube 32 in a direction indicated by the rotation area 92 without creating substantial fluid back pressure in a direction oppo¬ site that of the area 92. The spatial relationship provided by the mounting of the assembly head 26 and arcuate surface 32 is more clearly shown in Figure 3.
It should be appreciated that while four rollers 28 are shown mounted in a circular pattern about an assembly head axis 96, a larger or smaller number of rollers may be suitable depending upon pumping re¬ quirements. As shown, each roller 28 includes a roller axis 100 which is generally parallel to the assembly head axis 96. As shown in Figure 3, the arcuate surface 34 is configured and the pump arm 36 positioned with respect to the assembly head 26 so that as the assembly head 26 is rotated in the direction of arrow 92, each roller 28 successively contacts the tube 32, gradually compresses and seals the tube 32 during approximately a 45° rotation of the assembly head 26.
Further configuration of the arcuate surface 34 and position of the pump arm 36 with respect to the assembly head 26 enables each roller to gradually release the tube during a rotation of the assembly head 26 of about 45°. This configuration also enables each roller to remain in a sealing engagement with the tube 32 during approximately a 90° rotation of the assembly head 26.
This is to be contrasted with a prior art peristaltic pump 102 in which positioning of prior art assembly heads 104 with pump arm arcuate surfaces 106 is shown in Figure 4. In the prior art arrangement, sealing of the tube 108 occurs in a small angular rotation (In the direction of arrow 110) of the prior art assembly head 104. This results in movement of fluid within the prior art tube 108 away from the compressing prior art roller 112 which causes significant back pressure in the prior art tube 108 as indicated by the arrow 114.
To further enhance the efficient and reliable sealing of the tube 32 by the rollers 28 in the pump 10, according to the present invention, a specific circumferential surface 116 on the rollers 28 is provided, as shown in Figure 5. As shown, each roller 28 has an inside diameter 118 which is smaller than roller diameters 120 at each end 122, 124 of each roller. This inside diameter 118 is constant between the end diameters 120 and the end diameters 120 are interconnected with the inside diameter 118 by arcuate surface 126.
This generally U-shaped cross-section of the roller provides for uniform sealing tube 32 as shown in Figure 5 which is not possible with a flat or uniform diameter roller 130, see Figure 5a. As shown in cross-section in Figure 5-A, the prior art roller 130 provides incomplete sealing of a tube 132 because the circular nature of the tube inside diameter results in end voids 134 136 unless sufficient pressure is exerted to collapsible the tube side 138.
However, such increased pressure by the rollers 112 may lead to excessive tube wear and may further result in a excess loading on the assembly head 104 and rollers 112.
In order to prevent movement of the tube 32 through the housing 40, collars 144 146 may be at- tached or molded into the tube at a spaced apart distance from one another in order that each collar is positioned abutting the housing front 40 upon assembly of the tube 32 into the housing 40 and around the rollers 28. The collar diameter is chosen in order to prevent entry of the collar into the housing means 40. It has been found that reliable and efficient perfor¬ mance of the pump is provided when the compressible and resilient tube is formed from silicon having a hardness of about 55 durometers, Shore A, platinum or peroxide cure method, and a typical tubing size is three-eighth inch. Preferably the tube is formed from a peroxide cure silicon, said cure being well known in the art.
This size tube enables pumping volumes of up to about 40 cc/minute when the assembly head is rotated at up to about 75 rpm.
The hereinabove described arrangement of the assembly head 26, rollers 28, and pump head 36 with arcuate surface 34 using the hereinabove referenced tube 32 configuration enables a significant reduction in back pressure as compared to a prior art peristal¬ tic pump 102 having the same overall dimensions and operated at the same volume output. This is clearly shown in Figures 6 and 7 which are plots of the vacuum drawn by the pump as a function of time for pumping volumes of about 10 cc per minute and 40 cc per minute.
Curves A in both Figures 6 and 7 represent the prior art pump performance while Curves B in Figures 6 and 7 represent the results of a peristaltic pump configured in accordance with the present invention.
It can be easily seen from Figure 6 that the vacuum variation on the intake of the pump 10 in accordance with the present invention operating at about 10 ccs per minute is less than plus or minus 4 mm Hg at a vacuum of about 18 mm Hg. This is to be compared with the vacuum variation on the intake of the prior art pump 102 which is about plus or minus 8 mm Hg at 10 ccs per minute. Thus the change in back pressure of the pump 10 in accordance with the present invention over the prior art pump 102 is a factor of two.
An even greater inprove ent in reduced vacuum variation or back pressure is exhibited by the pump 10 in accordance with the present invention when operating at a higher flow rate. This is shown in Figure 7 wherein the variation of vacuum for the pump 10 is about plus or minus 5 Hg whereas the variation of vacuum for the prior art pump 102 is about plus or minus 15 Hg. A factor of about 3 improvement.
Although there has been hereinabove described a specific peristaltic pump in accordance with the present invention, for the purpose of illustrating the manner in which the invention may be used to advan¬ tage, it should be appreciated that the invention is not limited thereto. Accordingly, any and all modifi- cations, variations, or equivalent arrangements which may occur to those skilled in the art, should be considered to be within the scope of the present invention as defined in the appended claims.

Claims

WHAT IS CLAIMED IS:
1. A peristaltic pump comprising:
a plurality of tube compression means for compressing and sealing a collapsible and resilient tube; housing means for guiding the col¬ lapsible and resilient tube to and from said tube compression means; means for causing said plurality of tube compression means to successively contact, gradually compress and seal the collapsible and resilient tube and there¬ after gradually uncompress the tube in order to move a fluid through the tube in one direction, without creating substantial fluid back pressure in an opposite direc¬ tion.
2. The peristaltic pump according to claim 1 wherein said plurality of tube compression means comprises a plurality of rollers.
3. The peristaltic pump according to claim 2 wherein said means for causing said plurality of tube compression means to contact, compress and seal the tube comprises a pump arm having an arcuate surface and mounted to said housing means in a position enabling said rollers to contact, compress and seal the tube.
4. The peristaltic pump according to claim 3 further comprising assembly head means for supporting the plurality of rollers, said rollers being mounted in a circular pattern about an assembly head axis, said rollers having a rotation axis generally parallel to the assembly head axis.
5. The peristaltic pump according to claim 4 wherein said arcuate surface is configured and said pump arm positioned with respect to said assembly head so that as the assembly head is rotated, each roller successively contacts the tube, gradually compresses and seals the tube during approximately a 45° rotation of the assembly head.
6. The peristaltic pump according to claim 5 wherein said arcuate surface is configured and said pump arm positioned with respect to said assembly head so that each roller gradually releases the tube during a rotation of the assembly head of about 45°.
7. The peristaltic pump according to claim 6 wherein said arcuate surface is configured and said pump arm positioned with respect to said assembly head so that each roller remains in sealing engagement with the tube during approximately a 45° rotation of the assembly head.
8. The peristaltic pump according to claim 7 wherein each roller comprises means, defining a circumferential surface thereon, for uniformly sealing the tube as the roller compresses the tubing.
9. The peristaltic pump according to claim 8 wherein said plurality of tube compression means comprises four rollers.
10. The peristaltic pump according to claim 9 wherein each roller has an inside diameter that is smaller than the roller diameter at each end of each roller.
11. The peristaltic pump according to claim 10 wherein each roller has a constant diameter extending between the end diameter of each roller, said end diameter between longer than said constant diameter.
12. The peristaltic pump according to claim 11 wherein said end diameters are interconnected with said constant diameter by an arcuate surface.
13. A peristaltic pump comprising:
assembly head means for supporting a plurality of rollers, said rollers being mounted in an arcuate pattern about an assembly head axis, each roller having a rotation axis generally parallel to the assembly head axis; housing means for rotatably mounting said assembly head and for guiding a col¬ lapsible and resilient tube over said rollers; and a pump arm having an arcuate surface and mounted to said housing means in a position enabling said roller to compress the tube against the arcuate surface as the assembly head is rotated, said arcuate surface being shaped and positioned with respect to said assembly head so that as the assembly head is rotated, each roller suc¬ cessively contacts the tube, gradually compresses and seals the tube during approx¬ imately a 45° rotation of the assembly head.
14. The peristaltic pump according to claim 13 wherein said arcuate surface is configured and said pump arm positioned with respect to said assembly head so that each roller gradually releases the tube during a rotation of the assembly head of about 45".
15. The peristaltic pump according to claim 14 wherein said arcuate surface is configured and said pump arm positioned with respect to said assembly head so that each roller remains in sealing engagement with the tube during approximately a 45° rotation of the assembly head.
16. A peristaltic pump comprising:
assembly head means for supporting a plurality of rollers, said rollers being mounted in an arcuate pattern about an assembly head axis, each roller having a rotation axis generally parallel to the assembly head axis; a collapsible and resilient tube; housing means for rotatably mounting said assembly head and for guiding the collapsible and resilient tube over said rollers; and a pump arm having an arcuate surface and mounted to said housing means in a position enabling said roller to compress the tube against the arcuate surface as the assembly head is rotated, said arcuate surface being shaped and positioned with respect to said assembly head so that as the assembly head is rotated, each roller suc¬ cessively contacts the tube and gradually seals the tube during approximately a 45° rotation of the assembly head.
17. The peristaltic pump according to claim 4 wherein said plurality of tube compressor means comprises four rollers.
18. The peristaltic pump according to claim 17 wherein each roller comprises means, defining a circumferential surface thereon, for uniformly sealing the tube as the roller compresses the tubing.
19. The peristaltic pump according to claim 18 wherein said collapsible and resilient tube comprises means for preventing movement of the tube through the housing means.
20. The peristaltic pump according to claim 19 wherein said means for preventing movement of the tube comprises at least one collar disposed on said tube and having a dimension sufficient to prevent entry of the collar into the housing means.
21. The peristaltic pump according to claim 20 wherein said collapsible and resilient tube comprises a silicon tube of about 55 durometers, Shore A, platinum cure method, and said collar is molded thereto.
22. The peristaltic pump according to claim 21 wherein each roller has an inside diameter that is smaller than roller diameters at each end of each roller.
23. The peristaltic pump according to claim 22 wherein each roller has a constant diameter extending between end diameters of each roller, said end diam¬ eters between longer than said constant diameter.
24. The peristaltic pump according to claim 23 wherein said end diameters are interconnected with said constant diameter by an arcuate surface.
25. The peristaltic pump according to claim 20 wherein said collapsible and resilient tube comprises a silicon tube of about 55 durometers, Shore A, platinum cure method, and said collar is molded thereto.
AMENDED CLAIMS
[received by the International Bureau on 4 October 1993 (04.10.93); original claims 1-25 replaced by amended claims 1-8 (2 pages)]
1. A peristaltic pump comprising: assembly head means for supporting a plurality of rollers, said rollers being mounted in an arcuate pattern about an assembly head axis, each roller having a rotation axis generally parallel to the assembly head axis; a collapsible and resilient tube; housing means for rotatably mounting said assembly head and for guiding the collapsible and resilient tube over said rollers; a pump arm having an arcuate surface and mounted to said housing means in a position enabling said rollers to compress the tube against the arcuate surface as the assembly head is rotated, said arcuate surface being shaped and positioned with respect to said assembly head so that as the assembly head is rotated, each roller successively contacts the tube and gradually seals the tube during approximately a 45° rotation of the assembly head, said pump arm being pivotally mounted to said housing means; and means for rigidly positioning and locking the pump arm in a closed position enabling said rollers to compress the tube against the arcuate surface. 2. The peristaltic pump according to claim 1 wherein said plurality of tube compressor means comprises four rollers.
3. The peristaltic pump according to claim 2 wherein each roller comprises means, defining a circumferential surface thereon, for uniformly sealing the tube as each roller compresses the tubing.
4. The peristaltic pump according to claim 3 wherein said collapsible and resilient tube comprises means for preventing movement of the tube through the housing means.
5. The peristaltic pump according to claim 4 wherein said means for preventing movement of the tube comprises at least one collar disposed on said tube and having a dimension sufficient to prevent entry of the collar into the housing means.
6. The peristaltic pump according to claim 5 wherein each roller has an inside diameter that is smaller than roller diameters at each end of each roller.
7. The peristaltic pump according to claim 6 wherein each roller has a constant diameter extending between end diameters of each roller, said end diameters being greater than said constant diameter.
8. The peristaltic pump according to claim 7 wherein said end diameters are interconnected with said constant diameter by an arcuate surface. STATEMENT UNDER ARTICLE 19
The pump arm 36 of the present invention provides the exact arcuate surface necessary for operation of the peristaltic pump 10 and it is pivotally mounted to the housing 44, enabling movement thereof to facilitate insertion and removal of the tube 32.
However, it is critical that when the pump arm is in a closed position, enabling the rollers 28 to compress the tube 32 against the arcuate surface 34, exact tolerances must be maintained. This is accomplished in the present invention through the use of a spring loaded latch which provides the means for rigidly positioning and locking the pump arm in the closed position.
As set forth in the original specification, beginning on page 5, line 34 and continuing through the first paragraph on page 6, locking is enabled by a tongue 56 which snaps over a recess 58 and the housing 40, securing a front housing wall 60 between the tongue 56 and a rear portion 60 to the latch 54.
The present amendment to the claims of the International Patent Application are made to distinguish the invention over the art cited in the International Search Report.
The peristaltic pump of the present invention features significantly reduced pump pulsations as shown in Figures 6 and 7 and, therefore, is particularly suitable for simultaneous removal and replacement of fluids in an eye cavity during ophthalmic surgery.
This feature of the present invention is afforded by controlled compensation of a tube through the use of exact alignment between rollers and an arcuate surface.
PCT/US1993/005064 1992-06-03 1993-05-27 Reduced pulsation tapered ramp pump head WO1993024755A1 (en)

Priority Applications (3)

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JP50078294A JP3380874B2 (en) 1992-06-03 1993-05-27 Tapered curved pump head with reduced pulse motion
EP93914211A EP0643808B1 (en) 1992-06-03 1993-05-27 Reduced pulsation tapered ramp pump head
DE69316360T DE69316360T2 (en) 1992-06-03 1993-05-27 PUMP HEAD WITH TAPERING RAMP FOR PULSATION REDUCTION

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US07/892,788 1992-06-03
US07/892,788 US5230614A (en) 1992-06-03 1992-06-03 Reduced pulsation tapered ramp pump head

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EP (1) EP0643808B1 (en)
JP (1) JP3380874B2 (en)
AT (1) ATE162275T1 (en)
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US6413059B1 (en) 1998-02-19 2002-07-02 University Of Melbourne Linearized peristaltic pump

Also Published As

Publication number Publication date
EP0643808A1 (en) 1995-03-22
JP3380874B2 (en) 2003-02-24
AU4395593A (en) 1993-12-30
JPH07507612A (en) 1995-08-24
DE69316360T2 (en) 1998-08-13
US5230614A (en) 1993-07-27
ATE162275T1 (en) 1998-01-15
EP0643808B1 (en) 1998-01-14
DE69316360D1 (en) 1998-02-19
CA2136015A1 (en) 1993-12-09

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