EP0044217A1 - Pompe volumétrique - Google Patents

Pompe volumétrique Download PDF

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Publication number
EP0044217A1
EP0044217A1 EP81303189A EP81303189A EP0044217A1 EP 0044217 A1 EP0044217 A1 EP 0044217A1 EP 81303189 A EP81303189 A EP 81303189A EP 81303189 A EP81303189 A EP 81303189A EP 0044217 A1 EP0044217 A1 EP 0044217A1
Authority
EP
European Patent Office
Prior art keywords
resilient member
volumetric pump
cavity
pump according
liquid
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Withdrawn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
EP81303189A
Other languages
German (de)
English (en)
Inventor
Mats Lindroth
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0044217A1 publication Critical patent/EP0044217A1/fr
Withdrawn legal-status Critical Current

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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
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/0009—Special features
    • F04B43/0054—Special features particularities of the flexible members
    • F04B43/0063—Special features particularities of the flexible members bell-shaped flexible members

Definitions

  • This invention relates to volumetric pumps for pumping measured quantities of fluids.
  • the infusion apparatus used includes what is usually referred to as an infusion set comprising means for connecting the infusion set to a container containing a liquid to be infused, a drip chamber, means for controlling the rate of drip in the drip chamber and hence the rate of feed of the liquid to be infused, a needle for introducing the liquid to be infused into the body of a patient, and flexible tubing connecting the various components together.
  • an infusion set comprising means for connecting the infusion set to a container containing a liquid to be infused, a drip chamber, means for controlling the rate of drip in the drip chamber and hence the rate of feed of the liquid to be infused, a needle for introducing the liquid to be infused into the body of a patient, and flexible tubing connecting the various components together.
  • the liquid to be infused is gravity fed to the patient.
  • the liquid is frequently infused under pressure using suitable pump means.
  • peristaltic pumps and diaphragm pumps are peristaltic pumps and diaphragm pumps. Neither of these types of pump is sufficiently accurate to ensure that the liquid to be infused will be delivered at a precisely controlled rate and accordingly where such pumps are used it is necessary to provide expensive control means, e.g., comprising a sensor for determining the rate of drip in the drip chamber and means for controlling the operation of the pump to maintain the rate of drip in the drip chamber at a predetermined level.
  • Another type of pump used is a piston pump the piston and cylinder of which resemble a conventional syringe and which are produced in a disposable cassette form with the piston and cylinder encapsulated to prevent contamination of the liquid being pumped during reciprocation of the piston.
  • Such piston pumps are capable of delivering a precisely measured volume of liquid.
  • the present invention has for its object to provide a volumetric pump which is capable of pumping liquids in measured quantities under sterile conditions or under conditions where the liquid e.g., because of its toxicity or corrosive properties, should not come into direct contact with the pumping mechanism and which when used for the parenteral infusion of liquids can be used with an infusion set which, although specially adapted, need be little more expensive than the infusion sets used in parenteral infusion by gravity.
  • the invention also has as its object to . provide an infusion set for use with the volumetric pump. of the present invention.
  • the present invention provides a volumetric pump comprising a housing defining a substantially spherical cavity, a hollow resilient substantially spherical member mounted or mountable within said cavity so as to closely follow the internal contour of said cavity, means providing an inlet for liquid to and means providing an outlet for liquid from the interior of said resilient member, and means for continuously successively deforming said resilient member to effect a predetermined change in volume thereof and for allowing said resilient member to return to its original volume.
  • Said housing is preferably formed in two parts which meet in a plane extending diametrically of said cavity and which are separable to allow access to said cavity for the mounting of a said resilient member therein.
  • Said resilient member may have inlet and outlet passages communicating with the interior thereof and said housing may have bores or channels therein for receiving said passages.
  • said bores or channels are formed in two mating halves in said two parts of the housing.
  • the said inlet and outlet passages may have suitable valve means associated therewith for controlling the flow of liquid to and from the interior of said resilient member, e.g., suitable non-return valves for preventing liquid in said resilient member from returning along said inlet passage and for preventing liquid in said outlet passage from returning to the interior of the resilient member.
  • suitable valve means associated therewith for controlling the flow of liquid to and from the interior of said resilient member, e.g., suitable non-return valves for preventing liquid in said resilient member from returning along said inlet passage and for preventing liquid in said outlet passage from returning to the interior of the resilient member.
  • the means for continuously successively deforming the resilient member to effect a predetermined change in volume thereof and for allowing the resilient member to return to its original volume may comprise suitable reciprocatable plunger means mounted in said housing.
  • end of said plunger means which engages said resilient member to effect deformation thereof is part-spherical and has a radius substantially equal to the radius of said resilient member.
  • the said hollow resilient member may comprise part of an infusion set for use with the pump.
  • the invention also provides an infusion set for use with a pump according to the present invention and comprising a said hollow resilient member.
  • the volumetric pump illustrated therein comprises a housing 1 formed in two parts la, lb and defining a substantially spherical cavity 2.
  • the two housing parts 1a, 1b meet in a plane extending diametrically of the cavity 2.
  • a hollow resilient substantially spherical member 3 which closely follows the internal contour of the cavity 2 and which has an inlet passage 4 and an outlet passage 5 communicating with the interior thereof.
  • the inlet passage 4 and the outlet passage 5 are received in bores 6, 7 respectively defined by the mating housing parts la, lb.
  • Suitable valve means 4a, 5a are associated with the inlet passage 4 and'outlet passage 5 respectively for controlling the flow of liquid through said passages.
  • Said valve means may comprise suitable non-return valves or, where the walls of said passages 4 and 5 are formed from resilient material, may comprise means for compressing and releasing the walls of said passages so as to selectively close or open said passages.
  • a plunger 8 mounted for reciprocating movement within the housing part la is a plunger 8 one end 9 of which is part-spherical with a radius substantially the same as that of the resilient member 3 and which is adapted to engage the resilient member 3 and the other end 10 of which is enlarged and is engaged by an eccentric 11.
  • a helical spring 12 mounted on the plunger 8 between the enlarged end 10 thereof and the housing part la serves to urge the plunger 8 in a direction away from the resilient member 3 and into engagement with the eccentric 11.
  • Means (not shown) is provided for rotating the eccentric 11 about an axis indicated at 13 for imparting reciprocatory movement to the plunger 8.
  • the plunger 8 deforms the resilient member 3 by a small amount as shown at 14.
  • the advance movement of the plunger 8 is preferably from 10 to 25% of the diameter of the resilient member 3 so that when fully advanced the resilient member 3 where engaged by the plunger 8 will be deformed inwards as indicated by the broken line 15 to effect a predetermined change in the volume of the resilient member 3.
  • the resilient member 3 may be formed from any suitable resilient material, e.g., a suitable plastics material such as polyurethane.
  • the speed of reciprocation of the plunger 8 will be not greater than the speed of recovery of the material from which the resilient member 3 is formed so that the resilient member 3 will closely follow the movements of the plunger 8.
  • the volumetric pump of the present invention is extremely simple in design and is capable of delivering liquid at a precisely measured rate.
  • the resilient member 3 acts as a pumping chamber which is readily replaceable at little cost, e.g., each time an infusion set is changed, thus making the pump particularly suitable for the pumping of liquids under sterile conditions or under conditions where it is necessary to prevent the liquid being pumped from coming into direct contact with the pumping mechanism.
  • Another advantage is that manual pumping is possible simply by manually squeezing the resilient member 3 and this can be useful, e.g., when first setting up an infusion set.
  • any gas bubbles which may form or be present in the liquid being pumped will tend to collect in the top of the resilient member 3.
  • the resilient member 3 will act as a gas trap and there will be little likelihood of any gas passing from the resilient member 3 through the outlet passage 5.
  • suitable means e.g., suitable optical or ultrasonic means or means relying upon a change in electrical capacitance, for detecting any build-up of gas in a liquid system incorporating a pump according to the present invention.
  • the resilient member 3 When used for the parenteral infusion of liquids under pressure, the resilient member 3 may comprise part of an infusion set. Since infusion sets are normally at least partly made from transparent resilient plastics materials such as polyurethane it will readily be appreciated that the resilient member 3 may readily be incorporated therein, e.g., in a resilient flexible tube thereof, at very little additional cost. This makes it possible to incorporate a resilient member 3 in all infusion sets whether these are to be used for parenteral infusion of liquids under gravity feed or under pressure and to simply insert the resilient member 3 into the cavity 2 of the pump apparatus and to actuate the plunger 8 when infusion under pressure is required.
  • the resilient member 3 is preferably in the shape of a true sphere because it is this shape which has the best recovery when deformed, it will be understood that the resilient member 3 could be of other hollow substantially spherical shapes, such as ovoid, if desired and the term "substantially spherical" as used herein is intended to include such variations in shape from a true sphere.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Reciprocating Pumps (AREA)
EP81303189A 1980-07-15 1981-07-13 Pompe volumétrique Withdrawn EP0044217A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8023043 1980-07-15
GB8023043 1980-07-15

Publications (1)

Publication Number Publication Date
EP0044217A1 true EP0044217A1 (fr) 1982-01-20

Family

ID=10514766

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81303189A Withdrawn EP0044217A1 (fr) 1980-07-15 1981-07-13 Pompe volumétrique

Country Status (1)

Country Link
EP (1) EP0044217A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0962601A2 (fr) * 1998-05-28 1999-12-08 Friedbert Prommer Dispositif doseur
WO2005111421A1 (fr) * 2004-05-14 2005-11-24 Seapower Pacific Pty Ltd Pompe a mouvement alternatif
CN102587007A (zh) * 2012-02-22 2012-07-18 江苏技术师范学院 保压增压器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2648288A (en) * 1946-03-11 1953-08-11 William J Marks Fluid pump
US3127846A (en) * 1960-02-16 1964-04-07 Kerns Homer Artificial blood pump means
DE1475180A1 (de) * 1966-04-27 1969-03-06 Burchard & Cie Chem Fab Dr Vorrichtung zum Zerstaeuben von in einem geschlossenen Behaelter befindlicher Fluessigkeit
US3496878A (en) * 1967-04-07 1970-02-24 Bio Medical Systems Inc System and apparatus for transfer of human fluids

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2648288A (en) * 1946-03-11 1953-08-11 William J Marks Fluid pump
US3127846A (en) * 1960-02-16 1964-04-07 Kerns Homer Artificial blood pump means
DE1475180A1 (de) * 1966-04-27 1969-03-06 Burchard & Cie Chem Fab Dr Vorrichtung zum Zerstaeuben von in einem geschlossenen Behaelter befindlicher Fluessigkeit
US3496878A (en) * 1967-04-07 1970-02-24 Bio Medical Systems Inc System and apparatus for transfer of human fluids

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0962601A2 (fr) * 1998-05-28 1999-12-08 Friedbert Prommer Dispositif doseur
WO2005111421A1 (fr) * 2004-05-14 2005-11-24 Seapower Pacific Pty Ltd Pompe a mouvement alternatif
EP1756425A1 (fr) * 2004-05-14 2007-02-28 Seapower Pacific Pty Ltd. Pompe a mouvement alternatif
EP1756425A4 (fr) * 2004-05-14 2009-03-11 Seapower Pacific Pty Ltd Pompe a mouvement alternatif
CN102587007A (zh) * 2012-02-22 2012-07-18 江苏技术师范学院 保压增压器

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19820715

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19831213