GB2239675A - Pump for pumping liquid - Google Patents

Pump for pumping liquid Download PDF

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Publication number
GB2239675A
GB2239675A GB8927450A GB8927450A GB2239675A GB 2239675 A GB2239675 A GB 2239675A GB 8927450 A GB8927450 A GB 8927450A GB 8927450 A GB8927450 A GB 8927450A GB 2239675 A GB2239675 A GB 2239675A
Authority
GB
United Kingdom
Prior art keywords
tube
pump
operative end
preceding
pump according
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.)
Withdrawn
Application number
GB8927450A
Other versions
GB8927450D0 (en
Inventor
Man Fai Shiu
Original Assignee
Man Fai Shiu
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 Man Fai Shiu filed Critical Man Fai Shiu
Priority to GB8927450A priority Critical patent/GB2239675A/en
Publication of GB8927450D0 publication Critical patent/GB8927450D0/en
Publication of GB2239675A publication Critical patent/GB2239675A/en
Application status is Withdrawn legal-status Critical

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/04Shafts or bearings, or assemblies thereof
    • F04D29/043Shafts
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/70Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/708Suction grids; Strainers; Dust separation; Cleaning specially for liquid pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D3/00Axial-flow pumps
    • F04D3/02Axial-flow pumps of screw type
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/10Blood pumps; Artificial hearts; Devices for mechanical circulatory assistance, e.g. intra-aortic balloon pumps
    • A61M1/1008Tubes; Connections therefor
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/10Blood pumps; Artificial hearts; Devices for mechanical circulatory assistance, e.g. intra-aortic balloon pumps
    • A61M1/101Non-positive displacement pumps, e.g. impeller, centrifugal, vane pumps
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/10Blood pumps; Artificial hearts; Devices for mechanical circulatory assistance, e.g. intra-aortic balloon pumps
    • A61M1/101Non-positive displacement pumps, e.g. impeller, centrifugal, vane pumps
    • A61M1/1029Drive systems therefor
    • A61M1/1031Drive systems therefor using a motor with canned rotor, i.e. a motor enclosed within a casing along with the rotor so that the motor bearings are lubricated by the blood that is being pumped
    • A61M1/1034Drive systems therefor using a motor with canned rotor, i.e. a motor enclosed within a casing along with the rotor so that the motor bearings are lubricated by the blood that is being pumped using rotating cables for driving
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/10Blood pumps; Artificial hearts; Devices for mechanical circulatory assistance, e.g. intra-aortic balloon pumps
    • A61M1/12Blood pumps; Artificial hearts; Devices for mechanical circulatory assistance, e.g. intra-aortic balloon pumps implantable into the body
    • A61M1/122Heart assist devices, i.e. for assisting an ailing heart, using additional pumping means in the blood circuit
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/10Blood pumps; Artificial hearts; Devices for mechanical circulatory assistance, e.g. intra-aortic balloon pumps
    • A61M1/12Blood pumps; Artificial hearts; Devices for mechanical circulatory assistance, e.g. intra-aortic balloon pumps implantable into the body
    • A61M1/125Blood pumps; Artificial hearts; Devices for mechanical circulatory assistance, e.g. intra-aortic balloon pumps implantable into the body intravascular, i.e. introduced or implanted in an existing blood vessel

Abstract

A pump for pumping liquid devised for medical or surgical use operates on an Archimedean screw principle and comprises a flexible plastics tube (11) having a flexible central drive cable or rod (15) stretching between its ends. An operative end (12) contains a Archimedean screw pump element (14) having a helix angle between 30 DEG and 45 DEG and centrally positioned by a spider (16). The operative end (12) has a filter mesh (13) and can be used for pumping blood. urine or other body fluids for example. The pump does not produce a vacuum and so avoids suction effect on surrounding tissue and the entrainment of large quantities of air. <IMAGE>

Description

Title: Pump for Pumping Liquid This invention relates to a pump for pumping liquid.

It was particularly devised for medical and surgical use but may find application in other fields.

In medicine and surgery there is often a requirement to pump body liquids for example blood, urine or saliva.

Conventional aspiration equipment uses a partial vacuum to suck fluid into a tube to a collection vessel.

There are several disadvantages to this method, especially in the medical and surgical context. Firstly, the suction is noisy. When the liquid is partially or completely drained, neighbouring tissue may be sucked against the tube by the vacuum, causing unnecessary damage to such tissue. Air is continuously drawn through a suction aspiration system. In situations where the aspired fluid is reintroduced to the patient, there is a risk of bacteria from the surrounding atmosphere being drawn into the liquid and concentrated by the action of the suction pump.

It is an object of the present invention to provide a pump for pumping liquid which does not rely on the creation of a partial vacuum.

According to the invention there is provided a pump comprising a tube, a helical pump element sized to be a close running fit within the tube, journal means for rotatably mounting the helical pump element at an operative end of the tube, elongate drive means for the helical pump element disposed within the tube and outlet means for liquid.

The tube may be flexible throughout its length except at the operative end The helix may have an angle of between:30" and 450 The drive means may comprise a Bowden cable or a rotary drive rod.

The outlet means may be laterally disposed at#a position between the ends of the flexible tube. The operative end of the tube may have a filter.

The invention will now be described in more detail by way of example only with reference to the accompanying drawings in which: Figure 1 shows a pump embodying the invention Figure 2 is an enlarged detail view of the operative end of the pump.

Referring to the drawings, a pump generally indicated at 10 comprises an elongate flexible tube 11 which is made from plastics material. An operative end portion 12 of the pump comprises a rigid plastics tube, shown in more detail in Figure 2.

A grid or mesh 13 covers the operative end.

A helical pump element 14 is mounted concentrically with the operative end 12 of the tube. The pump element 14 has a helix angle of between 300 and 450 and is a close fit within the operative end 12 of the tube.

A drive rod or cable 15 extends generally centrally through the tube 11 and is supported at the operative end by a spider 16. The drive cable or rod 15 has a pair of location abutments 17, one on each side of the spider, to prevent the helical pump element 14 from moving longitudinally in the tube.

In use, the operative end portion 18 of the pump is placed in an area to be drained and the cable 15 or drive rod is rotated at a variable speed by a suitable motor 19. The motor can be for example a battery operated DC motor or a compressed air drive unit. Liquid pumped on the Archimedean screw principle through the flexible tube 11 is discharged through a discharge opening 20.

The helical pump element 14 is a close fit within the rigid operative end portion 12 of the operative end. The rotation of the helical pump element can provide variable speed pumping of liquid in either direction but, because there is always equality of air pressure at either side of the blades of the helix, since they are not hermetically sealed, gases are not pumped by the apparatus. In other words, if the pump is being used to drain liquid from an area, when the liquid has been exhausted, there is no tendency for large quantities of air to be drawn through the pump. Where the liquid is blood for example, this may reduce air entrainment and hence contamination and deterioration of the blood, which is particularly advantageous if the blood is to be recirculated to the body.

The grid or mesh 13 prevents large solids entering the tube, for example blood clots or portions of tissue.

Since there is no vacuum created, there is no suction effect on surrounding tissues. No air pump is needed to operate the device. The rate of fluid removal is more easily adjustable than in a conventional evacuation unit.

Peristaltic or roller pumps are frequently used in pumping blood for surgical procedures. However, these are of heavy construction and act by compressing a tube externally, at the risk of crushing the cell structure of the blood being pumped. They have the advantage of being bidirectional.

However using the pump described, bidirectional pumping at variable rates can readily be achieved without substantial damage to the blood cells and without extensive air entrainment.

Such arrangements may also be used for bedside, peritoneal dialysis systems or continuous ambulatory peritoneal dialysis systems.

Bidirectional pumps of the type described could be provided in a miniaturised version capable of insertion into an artery or vein to facilitate blood withdrawal or infusion in haemodialysis.

Although the applications described above are principally in the field of medicine and surgery, the pump may be applicable in many other contexts. It could be arranged to be operated from a conventional domestic electric drill.

Claims (10)

1. A pump comprising a tube which is at least partly flexible, one end of the tube being an operative end, a helical pump element sized to be close running fit within the tube, journal means rotatably mounting the helical pump element at said operative end of the tube, elongate drive means for the helical pump element disposed within the tube, and outlet means spaced from said operative end of the tube for outlet of liquid pumped thereby.
2. A pump according to claim one wherein the tube is flexible throughout its entire length.
3. A tube according to claim 1 wherein said operative end only of the tube is rigid.
4. A pump according to any preceding claim wherein the helix has an angle of between 300 and 450.
5. A pump according to any preceding claim wherein the drive means comprise a flexible Bowden cable.
6. A pump according to any one of claims 1-4 wherein the drive means comprise a rotary drive rod.
7. A pump according to any preceding claim wherein said outlet means are laterally disposed at a position between the ends of the tube.
8. A pump according to any preceding claim wherein said operative end of the tube has a filter.
9. A pump according to any preceding claim and made of biologically acceptable synthetic plastics material.
10. A pump substantially as hereinbefore described with reference to and as illustrated in the accomnanying drawings.
GB8927450A 1989-12-05 1989-12-05 Pump for pumping liquid Withdrawn GB2239675A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8927450A GB2239675A (en) 1989-12-05 1989-12-05 Pump for pumping liquid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8927450A GB2239675A (en) 1989-12-05 1989-12-05 Pump for pumping liquid

Publications (2)

Publication Number Publication Date
GB8927450D0 GB8927450D0 (en) 1990-02-07
GB2239675A true GB2239675A (en) 1991-07-10

Family

ID=10667426

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8927450A Withdrawn GB2239675A (en) 1989-12-05 1989-12-05 Pump for pumping liquid

Country Status (1)

Country Link
GB (1) GB2239675A (en)

Cited By (73)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0560000A2 (en) * 1991-11-05 1993-09-15 Roberto Parravicini Ventricular pumping device
US5368438A (en) * 1993-06-28 1994-11-29 Baxter International Inc. Blood pump
WO1996019668A1 (en) * 1994-12-22 1996-06-27 Helpman Intellectual Properties B.V. Pump drive
WO2003055541A1 (en) * 2001-12-28 2003-07-10 Michael Henein Intravascular pump
WO2005084594A1 (en) * 2004-03-01 2005-09-15 Campbell James Albert Alexande Personal urinal
WO2006063318A1 (en) * 2004-12-09 2006-06-15 Palomar Medical Technologies, Inc. Oral appliance with heat transfer mechanism
CH700141A1 (en) * 2008-12-22 2010-06-30 Oertli Instr Ag Device for removing silicone oil from interior of eye of patient after vitrectomy surgery, has auger arranged in channels and rotatable around center axis such that oil-like substance is removable from inner side of eye through channels
US7758621B2 (en) 1997-05-15 2010-07-20 Palomar Medical Technologies, Inc. Method and apparatus for therapeutic EMR treatment on the skin
US7763016B2 (en) 1997-05-15 2010-07-27 Palomar Medical Technologies, Inc. Light energy delivery head
US7766961B2 (en) 2003-06-05 2010-08-03 Angio Dynamics, Inc. Systems and methods for performing bi-lateral interventions or diagnosis in branched body lumens
US7771401B2 (en) 2006-06-08 2010-08-10 Angiodynamics, Inc. Selective renal cannulation and infusion systems and methods
US7780628B1 (en) 1999-01-11 2010-08-24 Angiodynamics, Inc. Apparatus and methods for treating congestive heart disease
US7914503B2 (en) 2002-09-20 2011-03-29 Angio Dynamics Method and apparatus for selective material delivery via an intra-renal catheter
US7942916B2 (en) 2002-05-23 2011-05-17 Palomar Medical Technologies, Inc. Phototreatment device for use with coolants and topical substances
US7993325B2 (en) 2002-09-20 2011-08-09 Angio Dynamics, Inc. Renal infusion systems and methods
WO2012013973A1 (en) 2010-07-30 2012-02-02 Hivis Pumps As Screw type pump or motor
US8182473B2 (en) 1999-01-08 2012-05-22 Palomar Medical Technologies Cooling system for a photocosmetic device
US8328794B2 (en) 1996-12-02 2012-12-11 Palomar Medical Technologies, Inc. System for electromagnetic radiation dermatology and head for use therewith
JP2012531975A (en) * 2009-07-01 2012-12-13 ザ・ペン・ステイト・リサーチ・ファウンデイションThe Penn State Research Foundation Blood pump comprising an expandable cannula
US8346347B2 (en) 2005-09-15 2013-01-01 Palomar Medical Technologies, Inc. Skin optical characterization device
US8518011B2 (en) 2004-03-04 2013-08-27 Angiodynamics, Inc. Sheath for use in peripheral interventions
US8585678B2 (en) 2002-09-20 2013-11-19 Angiodynamics, Inc. Method and apparatus for intra-aortic substance delivery to a branch vessel
US8900060B2 (en) 2009-04-29 2014-12-02 Ecp Entwicklungsgesellschaft Mbh Shaft arrangement having a shaft which extends within a fluid-filled casing
US8915948B2 (en) 2002-06-19 2014-12-23 Palomar Medical Technologies, Llc Method and apparatus for photothermal treatment of tissue at depth
US8926492B2 (en) 2011-10-11 2015-01-06 Ecp Entwicklungsgesellschaft Mbh Housing for a functional element
US8932141B2 (en) 2009-10-23 2015-01-13 Ecp Entwicklungsgesellschaft Mbh Flexible shaft arrangement
US8944748B2 (en) 2009-05-05 2015-02-03 Ecp Entwicklungsgesellschaft Mbh Fluid pump changeable in diameter, in particular for medical application
US8979493B2 (en) 2009-03-18 2015-03-17 ECP Entwicklungsgesellscaft mbH Fluid pump
US8992163B2 (en) 2004-09-17 2015-03-31 Thoratec Corporation Expandable impeller pump
US8998792B2 (en) 2008-12-05 2015-04-07 Ecp Entwicklungsgesellschaft Mbh Fluid pump with a rotor
US9028216B2 (en) 2009-09-22 2015-05-12 Ecp Entwicklungsgesellschaft Mbh Rotor for an axial flow pump for conveying a fluid
US9028536B2 (en) 2006-08-02 2015-05-12 Cynosure, Inc. Picosecond laser apparatus and methods for its operation and use
US9067006B2 (en) 2009-06-25 2015-06-30 Ecp Entwicklungsgesellschaft Mbh Compressible and expandable blade for a fluid pump
US9089634B2 (en) 2009-09-22 2015-07-28 Ecp Entwicklungsgesellschaft Mbh Fluid pump having at least one impeller blade and a support device
US9089670B2 (en) 2009-02-04 2015-07-28 Ecp Entwicklungsgesellschaft Mbh Catheter device having a catheter and an actuation device
US9138518B2 (en) 2011-01-06 2015-09-22 Thoratec Corporation Percutaneous heart pump
US9217442B2 (en) 2010-03-05 2015-12-22 Ecp Entwicklungsgesellschaft Mbh Pump or rotary cutter for operation in a fluid
US9308302B2 (en) 2013-03-15 2016-04-12 Thoratec Corporation Catheter pump assembly including a stator
US9314558B2 (en) 2009-12-23 2016-04-19 Ecp Entwicklungsgesellschaft Mbh Conveying blades for a compressible rotor
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US9339596B2 (en) 2009-12-23 2016-05-17 Ecp Entwicklungsgesellschaft Mbh Radially compressible and expandable rotor for a fluid pump
US9358330B2 (en) 2009-12-23 2016-06-07 Ecp Entwicklungsgesellschaft Mbh Pump device having a detection device
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US9364593B2 (en) 2004-09-17 2016-06-14 The Penn State Research Foundation Heart assist device with expandable impeller pump
US9381288B2 (en) 2013-03-13 2016-07-05 Thoratec Corporation Fluid handling system
US9416791B2 (en) 2010-01-25 2016-08-16 Ecp Entwicklungsgesellschaft Mbh Fluid pump having a radially compressible rotor
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US9421311B2 (en) 2012-07-03 2016-08-23 Thoratec Corporation Motor assembly for catheter pump
US9446179B2 (en) 2012-05-14 2016-09-20 Thoratec Corporation Distal bearing support
US9603983B2 (en) 2009-10-23 2017-03-28 Ecp Entwicklungsgesellschaft Mbh Catheter pump arrangement and flexible shaft arrangement having a core
US9611743B2 (en) 2010-07-15 2017-04-04 Ecp Entwicklungsgesellschaft Mbh Radially compressible and expandable rotor for a pump having an impeller blade
US9675740B2 (en) 2012-05-14 2017-06-13 Tc1 Llc Impeller for catheter pump
US9675739B2 (en) 2015-01-22 2017-06-13 Tc1 Llc Motor assembly with heat exchanger for catheter pump
US9675738B2 (en) 2015-01-22 2017-06-13 Tc1 Llc Attachment mechanisms for motor of catheter pump
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US9872947B2 (en) 2012-05-14 2018-01-23 Tc1 Llc Sheath system for catheter pump
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Publication number Priority date Publication date Assignee Title
GB804289A (en) * 1956-02-15 1958-11-12 Plastic Const Ltd Improvements in pumps for raising liquids
GB910780A (en) * 1960-07-14 1962-11-21 Buehler Ag Geb Improvements in or relating to casting machine feeding mechanism
GB1124531A (en) * 1966-03-16 1968-08-21 Lucien Julienne Arthur Jonckhe Improvements in and relating to axial-flow pumps
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GB1349729A (en) * 1971-05-25 1974-04-10 Oce Van Der Grinten Nv Powder dispensing apparatus
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Cited By (108)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0560000A3 (en) * 1991-11-05 1993-11-03 Roberto Parravicini Ventricular pumping device
EP0560000A2 (en) * 1991-11-05 1993-09-15 Roberto Parravicini Ventricular pumping device
US5368438A (en) * 1993-06-28 1994-11-29 Baxter International Inc. Blood pump
WO1996019668A1 (en) * 1994-12-22 1996-06-27 Helpman Intellectual Properties B.V. Pump drive
NL9402188A (en) * 1994-12-22 1996-08-01 Helpman Intellectual Propertie Pump drive.
US8328794B2 (en) 1996-12-02 2012-12-11 Palomar Medical Technologies, Inc. System for electromagnetic radiation dermatology and head for use therewith
US7763016B2 (en) 1997-05-15 2010-07-27 Palomar Medical Technologies, Inc. Light energy delivery head
US8002768B1 (en) 1997-05-15 2011-08-23 Palomar Medical Technologies, Inc. Light energy delivery head
US7935107B2 (en) 1997-05-15 2011-05-03 Palomar Medical Technologies, Inc. Heads for dermatology treatment
US8328796B2 (en) 1997-05-15 2012-12-11 Palomar Medical Technologies, Inc. Light energy delivery head
US7758621B2 (en) 1997-05-15 2010-07-20 Palomar Medical Technologies, Inc. Method and apparatus for therapeutic EMR treatment on the skin
US8109924B2 (en) 1997-05-15 2012-02-07 Palomar Medical Technologies, Inc. Heads for dermatology treatment
US8182473B2 (en) 1999-01-08 2012-05-22 Palomar Medical Technologies Cooling system for a photocosmetic device
US7780628B1 (en) 1999-01-11 2010-08-24 Angiodynamics, Inc. Apparatus and methods for treating congestive heart disease
WO2003055541A1 (en) * 2001-12-28 2003-07-10 Michael Henein Intravascular pump
US7942915B2 (en) 2002-05-23 2011-05-17 Palomar Medical Technologies, Inc. Phototreatment device for use with coolants
US7942916B2 (en) 2002-05-23 2011-05-17 Palomar Medical Technologies, Inc. Phototreatment device for use with coolants and topical substances
US8915948B2 (en) 2002-06-19 2014-12-23 Palomar Medical Technologies, Llc Method and apparatus for photothermal treatment of tissue at depth
US7914503B2 (en) 2002-09-20 2011-03-29 Angio Dynamics Method and apparatus for selective material delivery via an intra-renal catheter
US8585678B2 (en) 2002-09-20 2013-11-19 Angiodynamics, Inc. Method and apparatus for intra-aortic substance delivery to a branch vessel
US7993325B2 (en) 2002-09-20 2011-08-09 Angio Dynamics, Inc. Renal infusion systems and methods
US8012121B2 (en) 2002-09-20 2011-09-06 Angiodynamics, Inc. Method and apparatus for selective material delivery via an intra-renal catheter
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