US2545315A - Pump - Google Patents
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- Publication number
- US2545315A US2545315A US649461A US64946146A US2545315A US 2545315 A US2545315 A US 2545315A US 649461 A US649461 A US 649461A US 64946146 A US64946146 A US 64946146A US 2545315 A US2545315 A US 2545315A
- Authority
- US
- United States
- Prior art keywords
- ring
- eccentric
- pistons
- outlet
- cylinders
- 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 - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/053—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders
-
- 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
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/0404—Details or component parts
- F04B1/0426—Arrangements for pressing the pistons against the actuated cam; Arrangements for connecting the pistons to the actuated cam
-
- 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
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/06—Control
- F04B1/07—Control by varying the relative eccentricity between two members, e.g. a cam and a drive shaft
-
- 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
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/12—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members
- F04B49/123—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members by changing the eccentricity of one element relative to another element
- F04B49/125—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members by changing the eccentricity of one element relative to another element by changing the eccentricity of the actuation means, e.g. cams or cranks, relative to the driving means, e.g. driving shafts
- F04B49/126—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members by changing the eccentricity of one element relative to another element by changing the eccentricity of the actuation means, e.g. cams or cranks, relative to the driving means, e.g. driving shafts with a double eccenter mechanism
Definitions
- Fig-ure'l is a horizontalsectional view takenon the line of Figure "2;
- Figured is a vertical sectional view taken -on the'line 2-4 of " Figure -1.
- the numeral 1 designates a gear case which is tubular in form and which is supported on any suitable base, as '2.
- a frame comprising a supporting plate 3 with the concentricupstanding outer and inner annular flanges .4 and 5 .secured thereto in any preferred manner.
- This :ecc entr-ic is mounted-w ithin thering B and said ring and-eccentric have registering raceways inwhich the anti-'frictionballs 19 are mounted.
- the segment I' LJ-the ring8 and the 'balls I 9 may be assembled by leaving agate -inpne of said adjacen-t parts for inserting the "bails, which gate may then be closed, in any preferred manner, by welding or otherwise.
- the intake pipes 2l are-connected into the'common iriletmanifold 25 with which the inletsuction line "26 is connected and the outlet pipes 23 are tormented into a cominonoutlet manifold TI into which the discharge line 28 is connected.
- a pump of the character described comprising a frame having concentric upstanding flanges, radial cylinders extended through and anchored to said flanges, pistons in the cylinders, an oscillatable ring, connecting rods pivoted at their outer ends to the pistons and at their inner ends to said ring, an eccentric within the ring, said eccentric being adjustable to var the range of oscillation of the ring, means for driving the eccentric, a valve controlled intake pipe entering the outer end of each cylinder, a valve controlled outlet pipe leading from the outer end of each cylinder, inlet and outlet manifolds with which the respective intake and outlet pipes are connected, a suction line entering the inlet manifold and a discharge line leading from the outlet manifold.
- a pump of the character described comprising a frame having upstanding outer and inner flanges, radial cylinders extended through, and secured to the flanges, pistons reciprocable in the cylinders, an oscillatable ring, connecting rods pivoted at their outer ends to the pistons and at their inner ends to the ring, an eccentric within the ring, a shaft splined to the eccentric, driving gearing for driving the shaft and eccentric to oscillate the ring and reciprocate the pistons, said eccentric being adjustable to vary the range of the eccentric, to thereby vary the stroke of the pump, intake and outlet pipes connected into the outer ends of the cylinders, inlet and outlet manifolds into which the respective intake and outlet pipes are connected, valves controlling the intake and outlet pipes, a suction line entering the inlet manifold and a discharge line leading from the outlet manifold.
- a pump of the character described comprising, a gear case, a frame with supporting plate mounted thereon, said supporting plate 1 having concentric upstanding outer and inner annular flanges secured thereto, radial cylinders extended through the flanges, pistons reciprocable in the cylinders, an oscillatable ring, connecting rods pivoted at their outer ends to the pistons and at their inner ends to said ring, an eccentric mounted within the ring and being adjustable to vary the range of oscillation of the ring, a shaft mounted within a bearing secured within the gear case, driving gearing in the gear case for driving the shaft, said shaft being splined to said eccentric to oscillate the ring and reciprocate the pistons, a valve controlled intake pipe entering the outer end of each cylinder, a valve controlled outlet pipe leading from the outer end of each cylinder, inlet and outlet manifolds with which the respective intake and outlet pipes are connected, a suction line entering the inlet manifold and a discharge line leading from the outlet manifold.
- a pump of the character described comprising, a frame with supporting plate secured thereto, concentric upstanding flanges secured to said plate, a plurality of radial cylinders extended through and anchored to said flanges, pistons in the cylinders, a shaft concentric with said flanges and centrally located with respect to said cylinders, an oscillatable ring and connecting rods pivoted at their outer ends to the pistons and at their inner ends to the ring, an eccentric disc splined to said shaft and mounted within the ring, an eccentric segment adjustably secured to the disc, to vary the range of the disc and thereby to vary the stroke of the pump, driving gearing for rotating the shaft and said eccentric in order to oscillate the ring and reciprocate the pistons, intake and outlet pipes connected into the outer ends of the cylinders, inlet and outlet manifolds into which the I respective intake and outlet pipes are connected, valves controlling the intake and outlet pipes, a suction line entering the inlet manifold and a discharge line'leading from the outlet 7
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Description
March 13, 1951 c. w. SPROULL PUMP 2 Sheets-Sheet 1 Filed Feb. 25, 1946 March 13, 1951 c. w. SPROULL 2,545,315
PUMP
Filed Feb. 23, 1946 2 Sheets-Sheet 2 LLH 17 Patented Mar. 13, 1951 iii-u:
"ran .as'r A-rns an ccharles ESprmill, Houston, "lfiex; LEdith :Sproull :executrix :cf (lharrles TW. tispmull,
deceased .Appiicanonrebmary 23, 1946,'SeriaL-No. 6492261 6::Glaims. (Cl. NIB-7453) segment 'fl which he 'bdlted "to the disc H novel type of frame wherein the cylinders *and EM) the piston driving mechanism are mounted.
it is af-urther 'object of the invention to provide a pump of the character described wherein the piston driving mechanism may be readily adjusted to control the stroke of the pistons.
(other objects andadvantages will be "apparent from the following specification which is illustrated by the accompanying-drawings, wherein:
Fig-ure'l is a horizontalsectional view takenon the line of Figure "2; and
Figured is a vertical sectional view taken -on the'line 2-4 of "Figure -1.
Referring now more particularly -'to the drawings wherein like numerals of reference designate the same parts in each of the figures, the numeral 1 designates a gear case which is tubular in form and which is supported on any suitable base, as '2. Mounted on the gear case and suitably secured thereto there is .a frame comprising a supporting plate 3 with the concentricupstanding outer and inner annular flanges .4 and 5 .secured thereto in any preferred manner.
Extending through flanges and suitably secured thereto there are a plurality of radial cylinders wherein the pistons I are mounted to reciprocate.
These pistons are connected .to a ring 8 by means .0! the connecting rods 8 whose outer ends are pivoted to the respectivepistons and whosefinner ends are pivotal'ly connected to said ring 8.
Within the gear case I and fastened to the plate 3 thereis a bearing 10 in which the vertical shaft 11 is mounted to rotate.
Fixed on the lower end of the shaft ILI thereis ala'rge bevel gear wheel l2 which is in mesh and driven by a bevel pinion 113 which is fixed on i =-by a series of loolts I 8 or said segment [1 may he otherwise adjust-ably secured "to the dis'c Ni. I h'e segment i! *is circular in shapebu't it is eccentric with respecttd-the disc 16 andby'loosening the bolts l8 said segment may be adjusted dircum- 'ierentially about the disc I 6.
.said'idisc' 'l fiandthe segment F-I for-n1"an-reticentric which rotates with-the shaft H. 4
This :ecc entr-ic is mounted-w ithin thering B and said ring and-eccentric have registering raceways inwhich the anti-'frictionballs 19 are mounted.
The segment I' LJ-the ring8 and the 'balls I 9 may be assembled by leaving agate -inpne of said adjacen-t parts for inserting the "bails, which gate may then be closed, in any preferred manner, by welding or otherwise.
As the eccentric rotates with "the shaft H the "ring 8 "will he osciilate'd and will impart horrespending strokes to'the pistons in the cyI-inders 3.
Connected to the outer ends of the respective cylinders are the ma-ni'fold's 2-0.
"Leading into corre'sponding en'd-sof the inanii'oids "2'0 are the intakepipes -21 which are controlled bythe inwardly opening intake valves '22. Leading "outwardly from the opposite ends of said manifolds are the 'outlet 'pipes 23 which are controlledby the 'corresponding outlet valves 24.
The intake =pipes 2l are-connected into the'common iriletmanifold 25 with which the inletsuction line "26 is connected and the outlet pipes 23 are tormented into a cominonoutlet manifold TI into which the discharge line 28 is connected.
Accordinglyupon-rotation ofthe-eccentric, fluid will be constantly drawn in through -the suction "line 26 and discharged through the discharge line 28 and the capacity cfthe pumpimay'loe regulated by theadj ustment of the'ec'centric segment W, as
"hereina'bove explained.
An an-ti-Trictionbearing assembly!!! 'i's'provid'ed between the hub of the :dis'c B .and 'the frame of thepump.
The drawings and description are illustrative merely While the "broad principle of the invention will he defined by the appended claims.
What aclaiin .1. of the nti aracter described .comprising -.a.g ear case, .a frame mounted thereon having upstanding outer and inner flanges, radial cylinders extended through, and secured to the flanges, pistons reciprocable in the cylinders, an oscillatable ring connecting rods piv oted at their outer ends to the pistons and at their inner ends to the ring, an eccentric within the ring, a shaft splined to the eccentric, driving gearing in the gear case for driving the shaft and eccentric to oscillate the ring and reciprocate the pistons, intake and outlet pipes connected into the outer ends of the cylinders, inlet and outlet manifolds into which the respective intake and outlet pipes are connected, valves controlling the intake and outlet pipes, a suction line entering the inlet manifold and a discharge line leading from the outlet manifold.
2. A pump of the character described comprising a frame having concentric upstanding flanges, radial cylinders extended through and anchored to said flanges, pistons in the cylinders, an oscillatable ring, connecting rods pivoted at their outer ends to the pistons and at their inner ends to said ring, an eccentric within the ring, said eccentric being adjustable to var the range of oscillation of the ring, means for driving the eccentric, a valve controlled intake pipe entering the outer end of each cylinder, a valve controlled outlet pipe leading from the outer end of each cylinder, inlet and outlet manifolds with which the respective intake and outlet pipes are connected, a suction line entering the inlet manifold and a discharge line leading from the outlet manifold.
3. A pump of the character described comprising a frame having upstanding outer and inner flanges, radial cylinders extended through, and secured to the flanges, pistons reciprocable in the cylinders, an oscillatable ring, connecting rods pivoted at their outer ends to the pistons and at their inner ends to the ring, an eccentric within the ring, a shaft splined to the eccentric, driving gearing for driving the shaft and eccentric to oscillate the ring and reciprocate the pistons, said eccentric being adjustable to vary the range of the eccentric, to thereby vary the stroke of the pump, intake and outlet pipes connected into the outer ends of the cylinders, inlet and outlet manifolds into which the respective intake and outlet pipes are connected, valves controlling the intake and outlet pipes, a suction line entering the inlet manifold and a discharge line leading from the outlet manifold.
4. A pump of the character described comprising, a gear case, a frame with supporting plate mounted thereon, said supporting plate 1 having concentric upstanding outer and inner annular flanges secured thereto, radial cylinders extended through the flanges, pistons reciprocable in the cylinders, an oscillatable ring, connecting rods pivoted at their outer ends to the pistons and at their inner ends to said ring, an eccentric mounted within the ring and being adjustable to vary the range of oscillation of the ring, a shaft mounted within a bearing secured within the gear case, driving gearing in the gear case for driving the shaft, said shaft being splined to said eccentric to oscillate the ring and reciprocate the pistons, a valve controlled intake pipe entering the outer end of each cylinder, a valve controlled outlet pipe leading from the outer end of each cylinder, inlet and outlet manifolds with which the respective intake and outlet pipes are connected, a suction line entering the inlet manifold and a discharge line leading from the outlet manifold.
5. A pump of the character described comprising, a frame with supporting plate secured thereto, concentric upstanding flanges secured to said plate, a plurality of radial cylinders extended through and anchored to said flanges, pistons in the cylinders, a shaft concentric with said flanges and centrally located with respect to said cylinders, an oscillatable ring and connecting rods pivoted at their outer ends to the pistons and at their inner ends to the ring, an eccentric disc splined to said shaft and mounted within the ring, an eccentric segment adjustably secured to the disc, to vary the range of the disc and thereby to vary the stroke of the pump, driving gearing for rotating the shaft and said eccentric in order to oscillate the ring and reciprocate the pistons, intake and outlet pipes connected into the outer ends of the cylinders, inlet and outlet manifolds into which the I respective intake and outlet pipes are connected, valves controlling the intake and outlet pipes, a suction line entering the inlet manifold and a discharge line'leading from the outlet 7 registering raceways in which antifriction balls are mounted, an adjustable segment mounted around said eccentric to vary the range of the eccentric and thereby to vary the stroke of the pump, driving gearing for rotating the shaft and said eccentric. to oscillate the ring and reciprocate the pistons, intake and outlet pipes connected into the outer ends of the cylinders, inlet and outlet manifolds into which the respective intake and outlet pipes are connected, valves controlling the intake and outlet pipes, a suction line entering the inlet manifold and a discharge line leading from the outlet manifold.
CHARLES W. SPROULL.
REFERENCES CITED The following references are of record in the file of this patent:
Joy Oct. 6,
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US649461A US2545315A (en) | 1946-02-23 | 1946-02-23 | Pump |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US649461A US2545315A (en) | 1946-02-23 | 1946-02-23 | Pump |
Publications (1)
Publication Number | Publication Date |
---|---|
US2545315A true US2545315A (en) | 1951-03-13 |
Family
ID=24604887
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US649461A Expired - Lifetime US2545315A (en) | 1946-02-23 | 1946-02-23 | Pump |
Country Status (1)
Country | Link |
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US (1) | US2545315A (en) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3216355A (en) * | 1963-02-25 | 1965-11-09 | Seeger Wanner Corp | Two-cylinder pump |
US3447479A (en) * | 1967-06-02 | 1969-06-03 | Pall Corp | Syringe pump |
US3613510A (en) * | 1970-04-17 | 1971-10-19 | Hydranautics | Fluid pressure apparatus with orbiting oscillator |
US4080107A (en) * | 1975-09-08 | 1978-03-21 | Industrie Pirelli Societa Per Azioni | Bellows pump and pumping plant for oil-filled electric cables |
US4411190A (en) * | 1981-05-07 | 1983-10-25 | Kilmer John B | Energy translation device having individually compensated sliding valves and counterbalancing mechanism |
US4684143A (en) * | 1985-04-05 | 1987-08-04 | Yasunori Sato | Two-wheeled vehicle with hydraulic transmission |
DE3605213A1 (en) * | 1986-02-19 | 1987-08-20 | Uwe Niebuhr | Single-acting or double-acting radial piston pump or motor of pumpable substances as well as various explosives in use as an internal combustion engine |
US4963075A (en) * | 1988-08-04 | 1990-10-16 | The Charles Machine Works, Inc. | Radial diaphragm pump |
US5492535A (en) * | 1994-04-06 | 1996-02-20 | Cordis Corporation | Hand-powered pumping apparatus for perfusion and other fluid catheterization procedures |
US5529463A (en) * | 1994-04-19 | 1996-06-25 | Cordis Corporation | Pumping apparatus for perfusion and other fluid catheterization procedures |
EP0791366A1 (en) * | 1996-02-23 | 1997-08-27 | Medela AG | Suction device |
US20130039789A1 (en) * | 2009-12-17 | 2013-02-14 | Óscar Donado-Muñoz | Vacuum, pressure or liquid pump |
Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US139840A (en) * | 1873-06-10 | Improvement in pump and fire-engines | ||
US185390A (en) * | 1876-12-19 | Improvement in steam pumping machinery | ||
US831890A (en) * | 1906-01-06 | 1906-09-25 | Maurice George Plane | Positive-feed mechanical lubricator. |
US1040057A (en) * | 1912-02-09 | 1912-10-01 | John J Tokheim | Rotary pump. |
US1122124A (en) * | 1914-02-14 | 1914-12-22 | Peter Johnsen | Fuel-charging and charge-forming apparatus for internal-combustion engines. |
US1212791A (en) * | 1911-02-04 | 1917-01-16 | Charles M Manly | Variable-capacity pump. |
US1477300A (en) * | 1921-05-31 | 1923-12-11 | Homer C Thrift | Pump |
US2074618A (en) * | 1934-08-01 | 1937-03-23 | Clyde A Roeder | Pumping system |
US2255851A (en) * | 1940-10-21 | 1941-09-16 | Radial Pump And Compressor Com | Pump assembly |
US2257854A (en) * | 1938-07-12 | 1941-10-07 | Joseph A Peterson | Pressure regulator for fluids |
US2266003A (en) * | 1940-10-04 | 1941-12-16 | Omar E Clark | Pump or compressor |
US2297707A (en) * | 1940-02-14 | 1942-10-06 | Sullivan Machinery Co | Mechanical movement |
-
1946
- 1946-02-23 US US649461A patent/US2545315A/en not_active Expired - Lifetime
Patent Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US139840A (en) * | 1873-06-10 | Improvement in pump and fire-engines | ||
US185390A (en) * | 1876-12-19 | Improvement in steam pumping machinery | ||
US831890A (en) * | 1906-01-06 | 1906-09-25 | Maurice George Plane | Positive-feed mechanical lubricator. |
US1212791A (en) * | 1911-02-04 | 1917-01-16 | Charles M Manly | Variable-capacity pump. |
US1040057A (en) * | 1912-02-09 | 1912-10-01 | John J Tokheim | Rotary pump. |
US1122124A (en) * | 1914-02-14 | 1914-12-22 | Peter Johnsen | Fuel-charging and charge-forming apparatus for internal-combustion engines. |
US1477300A (en) * | 1921-05-31 | 1923-12-11 | Homer C Thrift | Pump |
US2074618A (en) * | 1934-08-01 | 1937-03-23 | Clyde A Roeder | Pumping system |
US2257854A (en) * | 1938-07-12 | 1941-10-07 | Joseph A Peterson | Pressure regulator for fluids |
US2297707A (en) * | 1940-02-14 | 1942-10-06 | Sullivan Machinery Co | Mechanical movement |
US2266003A (en) * | 1940-10-04 | 1941-12-16 | Omar E Clark | Pump or compressor |
US2255851A (en) * | 1940-10-21 | 1941-09-16 | Radial Pump And Compressor Com | Pump assembly |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3216355A (en) * | 1963-02-25 | 1965-11-09 | Seeger Wanner Corp | Two-cylinder pump |
US3447479A (en) * | 1967-06-02 | 1969-06-03 | Pall Corp | Syringe pump |
US3613510A (en) * | 1970-04-17 | 1971-10-19 | Hydranautics | Fluid pressure apparatus with orbiting oscillator |
US4080107A (en) * | 1975-09-08 | 1978-03-21 | Industrie Pirelli Societa Per Azioni | Bellows pump and pumping plant for oil-filled electric cables |
US4411190A (en) * | 1981-05-07 | 1983-10-25 | Kilmer John B | Energy translation device having individually compensated sliding valves and counterbalancing mechanism |
US4684143A (en) * | 1985-04-05 | 1987-08-04 | Yasunori Sato | Two-wheeled vehicle with hydraulic transmission |
DE3605213A1 (en) * | 1986-02-19 | 1987-08-20 | Uwe Niebuhr | Single-acting or double-acting radial piston pump or motor of pumpable substances as well as various explosives in use as an internal combustion engine |
US4963075A (en) * | 1988-08-04 | 1990-10-16 | The Charles Machine Works, Inc. | Radial diaphragm pump |
US5492535A (en) * | 1994-04-06 | 1996-02-20 | Cordis Corporation | Hand-powered pumping apparatus for perfusion and other fluid catheterization procedures |
US5529463A (en) * | 1994-04-19 | 1996-06-25 | Cordis Corporation | Pumping apparatus for perfusion and other fluid catheterization procedures |
EP0791366A1 (en) * | 1996-02-23 | 1997-08-27 | Medela AG | Suction device |
US20130039789A1 (en) * | 2009-12-17 | 2013-02-14 | Óscar Donado-Muñoz | Vacuum, pressure or liquid pump |
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