US3464322A - Deformable diaphragm - Google Patents

Deformable diaphragm Download PDF

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Publication number
US3464322A
US3464322A US678409A US3464322DA US3464322A US 3464322 A US3464322 A US 3464322A US 678409 A US678409 A US 678409A US 3464322D A US3464322D A US 3464322DA US 3464322 A US3464322 A US 3464322A
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Prior art keywords
diaphragm
deformable
fluid
section
tube
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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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US678409A
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English (en)
Inventor
Michel J J Pequignot
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MICHEL J J PEQUIGNOT
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MICHEL J J PEQUIGNOT
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J3/00—Diaphragms; Bellows; Bellows pistons
    • F16J3/02—Diaphragms

Definitions

  • a pumping effect can also be obtained by mechanical action applied directly to the diaphragm by displacing the centre of the diaphragm by a rod or other similar means.
  • the present invention has for its object a deformable flexible diaphragm, characterized in that the said diaphragm is arranged so as to be deformed by the internal action of a fluid in the structure and the thickness of the said diaphragm.
  • the swelling eflect is produced by an action developed in the actual interior of the diaphragm instead of being caused by an external action.
  • the diaphragm is constituted by or associated with an assembly of tubes of elliptical section, wound in a spiral, in superimposition or in juxtaposed contact, communicating with a source of fluid under pressure. If the tubes are oval, the admission of a fluid under pressure into these tubes tends to give them a circular form, and the change from the oval shape to the circular shape is accompanied by a swelling or displacement of the diaphragm. This deformation gives rise to a variation of volume with pumping of the fluid external to the diaphragm.
  • FIG. 1 is a view in cross-section of the diaphragm when at rest.
  • FIG. 2 is a plan view of the same diaphragm.
  • FIG. 3 is a view in cross-section of the same diaphragm in the inflated position.
  • FIG. 4 gives a cross section of an alternative form of construction.
  • FIGS. 5 and 6 show in cross-section a different construction of a convex diaphragm with a deformation in the opposite sense to that of FIGS. 1 to 3.
  • FIG. 7 shows in cross-section a further form of construction.
  • FIG. '8 represents an alternative form.
  • FIGS. 9 to 11 relate to a further alternative form
  • FIG. 9 being a perspective view of this alternative
  • FIG. 10 is a view in cross-section taken along the line X-X of FIG. 9 showing the diaphragm in the position of rest
  • FIG. 11 shows a cross-section of the same diaphragm in the active position.
  • the diaphragm is constituted by a tube 10 wound in a spiral.
  • This tube is of oval section and the successive turns are in cont-act, stuck or welded to each other at 11.
  • the outer edge 12 of the spiral thus formed is embedded in a support formed for example by two parts 13 and 14, clamped together so as to grip the edge 12.
  • the spiral tube 10 is closed at its central portion 15 and its outer extremity 16 is connected to a source of fluid.
  • This inflation is utilized in order to create an impulse or pumping effect on one or two fluids in contact with the diaphragm.
  • This diaphragm has the advantage that it does not require for its operation any external action by pressure or mechanical action, The deformation is caused by an internal action due to the structure of the diaphragm. This results in a substantial reduction of the space which it occupies.
  • this diaphragm enables the action of an impulse at high pressure and very small volume to be converted to a displacement of a large volume at low pressure, or vice-versa. It therefore permits of large deformations and in consequence of high pumping capacities by injection of a small quantity of fluid under high pressure.
  • this diaphragm can carry out movements of considerable amplitude without it being necessary to enclose it in appropriate spaces having substantal bulk.
  • the turns of the tube 10 which form the diaphragm, of an elliptic section with the major axes parallel and in contact along the minor axes, are rigidly fixed to one or two thin sheets 17, 18 of elastic material.
  • the diaphragm according to the invention may be provided so as to be convex in the position of rest, as shown in FIGS. 5 and 6.
  • the diaphragm is then constituted by tubular elements 19 of oval or elliptic section, in contact by the extremities of the major axes of the ellipses.
  • the diaphragm is constituted by adjacent concentric tubes 21, in contact with each other but with communication passages 22 from one tube to the next adjacent tube.
  • the diaphragm may be composed of two half-shells 21a and 21b obtained by moulding and welded or stuck to each other so as to form the communication channels 22.
  • FIG. 8 shows a diaphragm constituted by elliptical hollow elements 25 arranged in the form of a pocket having its concavity on the side 26 of the fluid to be pumped.
  • the deformation may of course be effected by means of an internal depression.
  • the diaphragm according to the invention may be applied to all the utilizations of usual diaphragms in pumping, in measuring or control apparatus or instru ments, etc.
  • the diaphragm is particularly adapted to the production of ingrafted hearts, that is to say pumps which replace the heart in the circulation of the blood, and especially in pumps of this kind actuated by a magnetic or piezoelectric effect.
  • FIGS. 9 to 11 show a form of construction which is more particularly but not exclusively applicable to a pump forming an artificial heart.
  • This artificial heart. designed so as to be ingrafted, can be placed in the same position as the natural heart.
  • This device is composed of a juxtaposition of two series 28, 29 of tubular elements having an elliptical section. These tubular elements 28, 29 are juxtaposed so as to form a pocket having the general shape of a heart and are connected together at the lower point 30.
  • each series of elements 28 or 29 is connected to each other, either directly by appropriate orifices, or by collectors.
  • the two series 28 and 29 are separated by a partition 31.
  • each series of elements 28 or 29 represents a ventricle of the heart having an alternating action.
  • tubes 28 When the assembly of tubes 28 receives internallya fluid under pressure, these tubes are deformed and tend to take-up a circular form. This deformation shortens the wall 28 which tends to come into the position 28a in proximity to the partition 31, producing a variation of volume corresponding to the space 32 and imparting impulses on the fluid contained in the said space, for example blood.
  • the walls 28 and 29 thus take-up alternately the positions of FIG. 10 and FIG. 11, reproducing the natural movements of the heart.
  • a deformable diaphragm for impulsing and pumping fluids comprising at least one tubular element of noncircular cross section, said at least one element being disposed in a plurality of juxtaposed turns that are secured laterally to each other and that communicate with each other defining a continuous diaphragm surface, said at least one element constituting substantially the whole of the diaphragm from the central portion of the diaphragm out to the margin of the diaphragm, and means to connect said at least one element to a source of fluid under pressure whereby admission of said fluid into said at least one element causes deformation of the cross section of said at least one element during inflation of the diaphragm and movement thereof transverse to said diaphragm surface.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reciprocating Pumps (AREA)
  • External Artificial Organs (AREA)
US678409A 1966-12-19 1967-10-26 Deformable diaphragm Expired - Lifetime US3464322A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR87919A FR1512372A (fr) 1966-12-19 1966-12-19 Membrane déformable par action interne

Publications (1)

Publication Number Publication Date
US3464322A true US3464322A (en) 1969-09-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
US678409A Expired - Lifetime US3464322A (en) 1966-12-19 1967-10-26 Deformable diaphragm

Country Status (5)

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US (1) US3464322A (en:Method)
DE (1) DE1653595A1 (en:Method)
FR (1) FR1512372A (en:Method)
GB (1) GB1211242A (en:Method)
SE (1) SE323287B (en:Method)

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3668708A (en) * 1969-12-23 1972-06-13 North American Rockwell Artificial heart
US3827426A (en) * 1971-07-16 1974-08-06 P Sawyer Prosthetic pump
US4808187A (en) * 1987-10-05 1989-02-28 Iowa State University Research Foundation, Inc. Tactile stimulus receptor for a hand prosthesis
US5713954A (en) * 1995-06-13 1998-02-03 Abiomed R&D, Inc. Extra cardiac ventricular assist device
US6224540B1 (en) 1995-06-13 2001-05-01 Abiomed, Inc. Passive girdle for heart ventricle for therapeutic aid to patients having ventricular dilatation
US20020028981A1 (en) * 1999-12-23 2002-03-07 Lilip Lau Expandable cardiac harness for treating congestive heart failure
US6432039B1 (en) 1998-12-21 2002-08-13 Corset, Inc. Methods and apparatus for reinforcement of the heart ventricles
US6540659B1 (en) 2000-11-28 2003-04-01 Abiomed, Inc. Cardiac assistance systems having bi-directional pumping elements
US6547716B1 (en) 2000-11-28 2003-04-15 Abiomed, Inc. Passive cardiac restraint systems having multiple layers of inflatable elements
US6572534B1 (en) 2000-09-14 2003-06-03 Abiomed, Inc. System and method for implanting a cardiac wrap
US6602182B1 (en) 2000-11-28 2003-08-05 Abiomed, Inc. Cardiac assistance systems having multiple fluid plenums
US6612978B2 (en) 1999-12-22 2003-09-02 Paracor Surgical, Inc. Expandable cardiac harness for treating congestive heart failure
US6616596B1 (en) 2000-11-28 2003-09-09 Abiomed, Inc. Cardiac assistance systems having multiple layers of inflatable elements
US6626821B1 (en) 2001-05-22 2003-09-30 Abiomed, Inc. Flow-balanced cardiac wrap
US6695769B2 (en) 2001-09-25 2004-02-24 The Foundry, Inc. Passive ventricular support devices and methods of using them
US6846296B1 (en) 2000-09-14 2005-01-25 Abiomed, Inc. Apparatus and method for detachably securing a device to a natural heart
US20050049611A1 (en) * 2002-11-15 2005-03-03 Lilip Lau Cardiac harness delivery device and method
US7060023B2 (en) 2001-09-25 2006-06-13 The Foundry Inc. Pericardium reinforcing devices and methods of using them
US7146226B2 (en) 2003-11-07 2006-12-05 Paracor Medical, Inc. Cardiac harness for treating congestive heart failure and for defibrillating and/or pacing/sensing
US7158839B2 (en) 2003-11-07 2007-01-02 Paracor Medical, Inc. Cardiac harness for treating heart disease
US7174896B1 (en) 2002-01-07 2007-02-13 Paracor Medical, Inc. Method and apparatus for supporting a heart
US7229405B2 (en) 2002-11-15 2007-06-12 Paracor Medical, Inc. Cardiac harness delivery device and method of use
US20070145281A1 (en) * 2005-12-13 2007-06-28 Shlomo Ben-Haim Lens System For Nuclear Medicine Gamma Ray Camera
US7276021B2 (en) 2001-10-31 2007-10-02 Paracor Medical, Inc. Heart failure treatment device and method
US7282024B2 (en) 2004-01-12 2007-10-16 Paracor Medical, Inc. Cardiac harness having interconnected strands
US7291105B2 (en) 2003-07-10 2007-11-06 Paracor Medical, Inc. Self-anchoring cardiac harness
US20070276179A1 (en) * 2002-11-15 2007-11-29 Paracor Medical, Inc. Method of loading a cardiac harness in a housing
US20080064917A1 (en) * 2003-10-15 2008-03-13 Eli Bar Amplification-Based Cardiac Assist Device
US7381181B2 (en) 2001-09-10 2008-06-03 Paracor Medical, Inc. Device for treating heart failure
US7485089B2 (en) 2002-09-05 2009-02-03 Paracor Medical, Inc. Cardiac harness
US20090096497A1 (en) * 2007-10-16 2009-04-16 Feng Kai D Design structures including multiple reference frequency fractional-n pll (phase locked loop)
US7587247B2 (en) 2005-08-01 2009-09-08 Paracor Medical, Inc. Cardiac harness having an optimal impedance range
US7736299B2 (en) 2002-11-15 2010-06-15 Paracor Medical, Inc. Introducer for a cardiac harness delivery
US20110066159A1 (en) * 2004-10-06 2011-03-17 Boston Scientific Scimed, Inc. Medical retrieval device
US7976454B2 (en) 2002-01-07 2011-07-12 Paracor Medical, Inc. Cardiac harness
US8192351B2 (en) 2007-08-13 2012-06-05 Paracor Medical, Inc. Medical device delivery system having integrated introducer
US20120237353A1 (en) * 2009-09-22 2012-09-20 Ecp Entwicklungsgesellschaft Mbh Compressible rotor for a fluid pump

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US737154A (en) * 1902-09-15 1903-08-25 Robert Cooke Sayer Convolute pressure-bearing.
US1619866A (en) * 1926-07-19 1927-03-08 J L Baker Pressure-actuated-control device
US2212128A (en) * 1938-05-18 1940-08-20 Telefunken Gmbh Antenna
US2289549A (en) * 1939-08-23 1942-07-14 Linderman Devices Inc Diaphragm
US2376635A (en) * 1943-06-23 1945-05-22 Allen Bradley Co Expansible member mounting
US2376634A (en) * 1943-03-01 1945-05-22 Allen Bradley Co Edge-wound tubular expansible member
US2549597A (en) * 1948-03-10 1951-04-17 New York Rubber Corp Inflatable mattress for cribs and the like
US3327322A (en) * 1964-07-27 1967-06-27 Trw Inc Artificial heart powered by a fluid pressure pump means simulating the action of the human heart
US3343864A (en) * 1965-10-07 1967-09-26 James I Baer Material handling apparatus and the like
US3379411A (en) * 1967-03-17 1968-04-23 Scienco Inc Jacks employing elongated, tubular pneumatic elements

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US737154A (en) * 1902-09-15 1903-08-25 Robert Cooke Sayer Convolute pressure-bearing.
US1619866A (en) * 1926-07-19 1927-03-08 J L Baker Pressure-actuated-control device
US2212128A (en) * 1938-05-18 1940-08-20 Telefunken Gmbh Antenna
US2289549A (en) * 1939-08-23 1942-07-14 Linderman Devices Inc Diaphragm
US2376634A (en) * 1943-03-01 1945-05-22 Allen Bradley Co Edge-wound tubular expansible member
US2376635A (en) * 1943-06-23 1945-05-22 Allen Bradley Co Expansible member mounting
US2549597A (en) * 1948-03-10 1951-04-17 New York Rubber Corp Inflatable mattress for cribs and the like
US3327322A (en) * 1964-07-27 1967-06-27 Trw Inc Artificial heart powered by a fluid pressure pump means simulating the action of the human heart
US3343864A (en) * 1965-10-07 1967-09-26 James I Baer Material handling apparatus and the like
US3379411A (en) * 1967-03-17 1968-04-23 Scienco Inc Jacks employing elongated, tubular pneumatic elements

Cited By (72)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3668708A (en) * 1969-12-23 1972-06-13 North American Rockwell Artificial heart
US3827426A (en) * 1971-07-16 1974-08-06 P Sawyer Prosthetic pump
US4808187A (en) * 1987-10-05 1989-02-28 Iowa State University Research Foundation, Inc. Tactile stimulus receptor for a hand prosthesis
US6508756B1 (en) 1995-06-13 2003-01-21 Abiomed, Inc. Passive cardiac assistance device
US5713954A (en) * 1995-06-13 1998-02-03 Abiomed R&D, Inc. Extra cardiac ventricular assist device
US6224540B1 (en) 1995-06-13 2001-05-01 Abiomed, Inc. Passive girdle for heart ventricle for therapeutic aid to patients having ventricular dilatation
US6432039B1 (en) 1998-12-21 2002-08-13 Corset, Inc. Methods and apparatus for reinforcement of the heart ventricles
US6612978B2 (en) 1999-12-22 2003-09-02 Paracor Surgical, Inc. Expandable cardiac harness for treating congestive heart failure
US6702732B1 (en) 1999-12-22 2004-03-09 Paracor Surgical, Inc. Expandable cardiac harness for treating congestive heart failure
US20020028981A1 (en) * 1999-12-23 2002-03-07 Lilip Lau Expandable cardiac harness for treating congestive heart failure
US6663558B2 (en) 1999-12-23 2003-12-16 Paracor Surgical, Inc. Expandable cardiac harness for treating congestive heart failure
US7097611B2 (en) 2000-03-10 2006-08-29 Paracor Medical, Inc. Expandable cardiac harness for treating congestive heart failure
US6602184B2 (en) 2000-03-10 2003-08-05 Paracor Surgical, Inc. Expandable cardiac harness for treating congestive heart failure
US7124493B2 (en) 2000-03-10 2006-10-24 Paracor Medical, Inc. Method of manufacturing a cardiac harness
US6595912B2 (en) 2000-03-10 2003-07-22 Paracor Surgical, Inc. Expandable cardiac harness for treating congestive heart failure
US6612979B2 (en) 2000-03-10 2003-09-02 Paracor Surgical, Inc. Expandable cardiac harness for treating congestive heart failure
US7189202B2 (en) 2000-03-10 2007-03-13 Paracor Medical, Inc. Self-sizing cardiac harness for treating congestive heart failure
US7410461B2 (en) 2000-03-10 2008-08-12 Paracor Medical, Inc. Cardiac treatment apparatus
US7077802B2 (en) 2000-03-10 2006-07-18 Paracor Medical, Inc. Expandable cardiac harness for treating congestive heart failure
US6682474B2 (en) 2000-03-10 2004-01-27 Paracor Surgical, Inc. Expandable cardiac harness for treating congestive heart failure
US7081086B2 (en) 2000-03-10 2006-07-25 Paracor Medical, Inc. Expandable cardiac harness for treating congestive heart failure
US6846296B1 (en) 2000-09-14 2005-01-25 Abiomed, Inc. Apparatus and method for detachably securing a device to a natural heart
US6572534B1 (en) 2000-09-14 2003-06-03 Abiomed, Inc. System and method for implanting a cardiac wrap
US6540659B1 (en) 2000-11-28 2003-04-01 Abiomed, Inc. Cardiac assistance systems having bi-directional pumping elements
US6616596B1 (en) 2000-11-28 2003-09-09 Abiomed, Inc. Cardiac assistance systems having multiple layers of inflatable elements
US6602182B1 (en) 2000-11-28 2003-08-05 Abiomed, Inc. Cardiac assistance systems having multiple fluid plenums
US6547716B1 (en) 2000-11-28 2003-04-15 Abiomed, Inc. Passive cardiac restraint systems having multiple layers of inflatable elements
US6626821B1 (en) 2001-05-22 2003-09-30 Abiomed, Inc. Flow-balanced cardiac wrap
US7422558B2 (en) 2001-09-10 2008-09-09 Paracor Medical, Inc. Device for treating heart failure
US7381181B2 (en) 2001-09-10 2008-06-03 Paracor Medical, Inc. Device for treating heart failure
US7435213B2 (en) 2001-09-10 2008-10-14 Paracor Medical, Inc. Device for treating heart failure
US7354396B2 (en) 2001-09-25 2008-04-08 The Foundry, Inc. Passive ventricular support devices and methods of using them
US6695769B2 (en) 2001-09-25 2004-02-24 The Foundry, Inc. Passive ventricular support devices and methods of using them
US20040097787A1 (en) * 2001-09-25 2004-05-20 The Foundry, Inc. Passive ventricular support devices and methods of using them
US7060023B2 (en) 2001-09-25 2006-06-13 The Foundry Inc. Pericardium reinforcing devices and methods of using them
US20070073100A1 (en) * 2001-09-25 2007-03-29 The Foundry Inc. Pericardium reinforcing devices and methods for using them
US7404793B2 (en) 2001-10-31 2008-07-29 Paracor Medical, Inc. Heart failure treatment device and method
US7276021B2 (en) 2001-10-31 2007-10-02 Paracor Medical, Inc. Heart failure treatment device and method
US7976454B2 (en) 2002-01-07 2011-07-12 Paracor Medical, Inc. Cardiac harness
US7174896B1 (en) 2002-01-07 2007-02-13 Paracor Medical, Inc. Method and apparatus for supporting a heart
US7485089B2 (en) 2002-09-05 2009-02-03 Paracor Medical, Inc. Cardiac harness
US20070276179A1 (en) * 2002-11-15 2007-11-29 Paracor Medical, Inc. Method of loading a cardiac harness in a housing
US7189203B2 (en) 2002-11-15 2007-03-13 Paracor Medical, Inc. Cardiac harness delivery device and method
US7736299B2 (en) 2002-11-15 2010-06-15 Paracor Medical, Inc. Introducer for a cardiac harness delivery
US7572219B2 (en) 2002-11-15 2009-08-11 Paracor Medical, Inc. Cardiac harness delivery device and method
US7500946B2 (en) 2002-11-15 2009-03-10 Paracor Medical, Inc. Cardiac harness delivery device and method
US7338435B2 (en) 2002-11-15 2008-03-04 Paracor Medical, Inc. Cardiac harness delivery device and method
US20050049611A1 (en) * 2002-11-15 2005-03-03 Lilip Lau Cardiac harness delivery device and method
US7361139B2 (en) 2002-11-15 2008-04-22 Paracor Medical, Inc. Cardiac harness delivery device and method
US7229405B2 (en) 2002-11-15 2007-06-12 Paracor Medical, Inc. Cardiac harness delivery device and method of use
US7291105B2 (en) 2003-07-10 2007-11-06 Paracor Medical, Inc. Self-anchoring cardiac harness
US20080064917A1 (en) * 2003-10-15 2008-03-13 Eli Bar Amplification-Based Cardiac Assist Device
US7164952B2 (en) 2003-11-07 2007-01-16 Paracor Medical, Inc. Cardiac harness for treating congestive heart failure and for defibrillating and/or pacing/sensing
US7149588B2 (en) 2003-11-07 2006-12-12 Paracor Medical, Inc. Cardiac harness for treating congestive heart failure and for defibrillating and/or pacing/sensing
US7187984B2 (en) 2003-11-07 2007-03-06 Paracor Medical, Inc. Cardiac harness for treating congestive heart failure and for defibrillating and/or pacing/sensing
US7146226B2 (en) 2003-11-07 2006-12-05 Paracor Medical, Inc. Cardiac harness for treating congestive heart failure and for defibrillating and/or pacing/sensing
US7155295B2 (en) 2003-11-07 2006-12-26 Paracor Medical, Inc. Cardiac harness for treating congestive heart failure and for defibrillating and/or pacing/sensing
US7158839B2 (en) 2003-11-07 2007-01-02 Paracor Medical, Inc. Cardiac harness for treating heart disease
US7225036B2 (en) 2003-11-07 2007-05-29 Paracor Medical, Inc Cardiac harness for treating congestive heart failure and for defibrillating and/or pacing/sensing
US7282024B2 (en) 2004-01-12 2007-10-16 Paracor Medical, Inc. Cardiac harness having interconnected strands
US9149288B2 (en) * 2004-10-06 2015-10-06 Boston Scientific Scimed, Inc. Medical retrieval device
US20110066159A1 (en) * 2004-10-06 2011-03-17 Boston Scientific Scimed, Inc. Medical retrieval device
US7587247B2 (en) 2005-08-01 2009-09-08 Paracor Medical, Inc. Cardiac harness having an optimal impedance range
US20070145281A1 (en) * 2005-12-13 2007-06-28 Shlomo Ben-Haim Lens System For Nuclear Medicine Gamma Ray Camera
US7402813B2 (en) 2005-12-13 2008-07-22 Spectrum Dynamics Llc Lens system for nuclear medicine gamma ray camera
US8192351B2 (en) 2007-08-13 2012-06-05 Paracor Medical, Inc. Medical device delivery system having integrated introducer
US20090096497A1 (en) * 2007-10-16 2009-04-16 Feng Kai D Design structures including multiple reference frequency fractional-n pll (phase locked loop)
US20120237353A1 (en) * 2009-09-22 2012-09-20 Ecp Entwicklungsgesellschaft Mbh Compressible rotor for a fluid pump
US9416783B2 (en) * 2009-09-22 2016-08-16 Ecp Entwicklungsgellschaft Mbh Compressible rotor for a fluid pump
US11421701B2 (en) 2009-09-22 2022-08-23 Ecp Entwicklungsgesellschaft Mbh Compressible rotor for a fluid pump
US11773861B2 (en) 2009-09-22 2023-10-03 Ecp Entwicklungsgesellschaft Mbh Compressible rotor for a fluid pump
US12276285B2 (en) 2009-09-22 2025-04-15 Ecp Entwicklungsgesellschaft Mbh Compressible rotor for a fluid pump

Also Published As

Publication number Publication date
GB1211242A (en) 1970-11-04
DE1653595A1 (de) 1971-08-12
FR1512372A (fr) 1968-02-09
SE323287B (en:Method) 1970-04-27

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