EP3123032A1 - Pumpengehäuse aus mindestens drei unterschiedlichen versinterbaren materialien - Google Patents
Pumpengehäuse aus mindestens drei unterschiedlichen versinterbaren materialienInfo
- Publication number
- EP3123032A1 EP3123032A1 EP15711750.8A EP15711750A EP3123032A1 EP 3123032 A1 EP3123032 A1 EP 3123032A1 EP 15711750 A EP15711750 A EP 15711750A EP 3123032 A1 EP3123032 A1 EP 3123032A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump housing
- housing
- pump
- alloy
- range
- 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- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/02—Selection of particular materials
- F04D29/026—Selection of particular materials especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/0606—Canned motor pumps
- F04D13/064—Details of the magnetic circuit
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/181—Axial flow rotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/522—Casings; Connections of working fluid for axial pumps especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/528—Casings; Connections of working fluid for axial pumps especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/64—Mounting; Assembling; Disassembling of axial pumps
- F04D29/648—Mounting; Assembling; Disassembling of axial pumps especially adapted for liquid pumps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/14—Producing shaped prefabricated articles from the material by simple casting, the material being neither forcibly fed nor positively compacted
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/14—Producing shaped prefabricated articles from the material by simple casting, the material being neither forcibly fed nor positively compacted
- B28B1/16—Producing shaped prefabricated articles from the material by simple casting, the material being neither forcibly fed nor positively compacted for producing layered articles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2230/00—Manufacture
- F05D2230/20—Manufacture essentially without removing material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2230/00—Manufacture
- F05D2230/40—Heat treatment
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/10—Metals, alloys or intermetallic compounds
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/10—Metals, alloys or intermetallic compounds
- F05D2300/17—Alloys
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/20—Oxide or non-oxide ceramics
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/50—Intrinsic material properties or characteristics
- F05D2300/507—Magnetic properties
Definitions
- the invention relates to a pumping device comprising i. an impeller; ii. a pump housing including a wall surrounding an interior region having an inlet and an outlet, the impeller being provided in the interior of the pump housing; wherein the pump housing includes at least a first portion, at least two further portions and at least a third portion; wherein the at least one first portion includes at least 60 wt .-% based on the total weight of the first portion, at least one non-magnetic material, wherein the at least two further portions each to at least 25 wt .-%, based on the total weight of the respective at least one ferromagnetic material, wherein the at least one third portion includes a metal content in a range of 40 to 90 wt .-%, based on the total weight of the third portion, wherein the wall of the pump housing in at least one plane (Q) perpendicular to the longitudinal extent of the pump housing has at least a first portion and at least two further portions, wherein the at least one first portion and at
- the invention also relates to a method for producing a pump housing, comprising the steps: a. Providing a first material; b. Providing another material; c. Forming a third material, d. Forming a Pumpengephaseusevor essencers, wherein a first portion of the pump housing made of the first material and wherein at least two further portions of the pump housing are formed from the further material; and e. Treat the pump housing precursor at a temperature of at least 300 ° C.
- the invention relates to a pump housing for a pump device obtainable by the method and a housing having at least three subregions.
- the invention relates to a pumping device comprising the aforementioned housing or the aforementioned pump housing.
- Pumping devices with rotors or impellers are known. Some pumping devices have as a conveying path for a fluid to be pumped on a pump housing in the form of a tube. This is often an impeller, which is driven for example by a motor located outside the conveyor line via a drive shaft.
- the pump housing is attached to the pumping device via one or more retaining elements.
- This type of holder may involve various disadvantages. On the one hand, an additional step for attaching the holder is needed. This increases the production costs and is resource-inefficient.
- Another object is to provide a pumping device whose materials are as biocompatible as possible, easy to process, corrosion resistant and permanently connected to each other.
- Another object is to provide a pumping device that is configured as space-saving.
- Another object is to provide a pumping device which can be operated in an energy-saving manner.
- an object is to provide a voltage-free as possible pumping device, in particular with a tension-free housing as possible or Pump housing, and in particular provide a tension-free transition from the pump housing to the remaining part of the pumping device as possible.
- an object is to provide a pump housing for a pumping device which can be easily and space-savingly incorporated into other components, e.g. a component housing of the pump device can be integrated.
- an object is to provide a pump housing for a pumping device that can be hermetically sealed to a component housing of the pumping device.
- an object is to provide a housing or pump housing, which is as free as possible from internal and / or external stresses.
- an object is to provide a method to produce a pump housing as possible cost and time saving.
- a first subject of the present invention is a pumping device including: i. an impeller;
- a pump housing including a wall surrounding an interior area with an inlet and an outlet
- the impeller is provided in the interior of the pump housing; wherein the pump housing includes at least a first portion, at least two further portions and at least a third portion; wherein the at least one first subregion comprises at least 60% by weight, preferably at least 70% by weight, or preferably at least 80% by weight, based on the total weight of the first subregion, of at least one nonmagnetic material,
- the at least two further subregions each contain at least 25% by weight, preferably at least 40% by weight, or preferably at least 60% by weight, based on the total weight of the respective further subregion, of at least one ferromagnetic material, wherein the at least a third portion having a metal content in a range of 40 to 90 wt .-%, preferably in a range of 50 to 85 wt .-%, or preferably in a range of 60 to 80 wt .-%, based on the total weight of third subarea, includes,
- the wall of the pump housing in at least one plane (Q) perpendicular to the longitudinal extent of the pump housing has at least a first portion and at least two further portions
- the pumping device according to the invention is preferably suitable for being introduced into the body of a human or an animal.
- the pumping device according to the invention is further preferably designed to promote body fluids such as blood, serum, plasma, interstitial fluid, saliva or urine.
- body fluids such as blood, serum, plasma, interstitial fluid, saliva or urine.
- the introduction of the pumping device according to the invention may involve, for example, an implantation in the body, a placement on the body or a connection to the body.
- the pump housing of the pumping device may have any shape that would be selected by a person skilled in the art for use in a pumping device.
- the pump housing preferably has at least one wall of the pump housing, hereinafter also referred to as pump housing wall, on.
- the at least one wall of the pump housing surrounds the interior of the pump housing.
- the pump housing points at least two ends, wherein at least one inlet at the one end and at least one outlet at the other end are arranged.
- the interior of the pump housing is completely surrounded by the wall, except at the inlet and outlet of the pump housing.
- the interior side facing away from the pump housing is referred to as the outside of the pump housing.
- the pump housing preferably has an elongated shape.
- the pump housing is defined in its shape by a longitudinal extent and at least one cross section.
- a cross section of the pump housing is always determined in a plane that is perpendicular to the pump housing wall. If the pump housing wall is curved in the longitudinal extent, then a cross section is determined perpendicular to the tangent at a point on the pump housing wall. As longitudinal extension, the expansion of the pump housing in the pumping direction is considered. It is always the shortest, imaginary connection of inlet and outlet within the pump housing.
- the pump housing wall also referred to as a wall, extends in the direction of the longitudinal extent of the pump housing.
- the at least one wall may have one or more wall surfaces. If the pump housing has more than one wall surface, these are connected to one another via corners where the wall surfaces converge.
- the wall, and preferably also the wall surfaces, of the pump housing preferably extend parallel to the longitudinal extent of the pump housing.
- the inlet is at the first end and the outlet is at the opposite end of the pump housing.
- the pump housing preferably ends at least a portion of the pump housing wall.
- the part of the pump housing that projects beyond the interior into the environment is also referred to as the pump housing tongue.
- the pump housing is fluid-conductively connected to its surroundings via inlet and outlet. The openings at the ends of the pump housing allow a flow of fluid through the interior of the pump housing.
- the fluid is, for example, a gas, a liquid, such as blood, or a mixture thereof.
- the first opening serves as a supply line of the fluid to be conveyed into the inner region of the pump housing and the further opening serves as a discharge of the fluid to be delivered.
- the pump housing may have further openings, for example in the wall of the pump housing. These further openings can serve for additional supply of fluid or on the other side for the branched discharge of fluid. If the pumping device according to the invention is implanted in a body in order, for example, to support the blood circulation and thus to relieve the heart, then the pumping device according to the invention is connected via lines to blood vessels of the body.
- the pump housing includes at least a first portion, at least two further portions and at least a third portion.
- the first, the further and the third sub-range differ from each other preferably by their composition.
- the at least one first, the further as well as the at least one third subregion differ in their shape.
- the at least one first subregion preferably has at least one, particularly preferably all, of the following properties: maximum thermal stability;
- the at least two further subregions preferably have at least one, preferably more, more preferably all of the following properties: highest possible thermal resistance;
- the at least one third subregion preferably has at least one, preferably several, most preferably all of the following properties: maximum thermal stability;
- a pump housing which has one or more for the at least one first partial area, the at least two further partial areas and the at least one third partial area of the listed properties.
- at least a part of the at least one first partial area is connected to at least one part of the further partial areas.
- at least a part of the at least one first partial area is preferably connected to at least one part of the at least one third partial area.
- the connection can be an immediate connection of the respective subareas or an indirect one.
- the at least one first subregion and at least one of the at least two further subregions are connected to one another in a material-locking manner.
- the at least one first and the at least one third portion are connected to one another in a material-locking manner.
- the at least one first partial regions and at least one of the at least two further partial regions are connected to one another in a material-locking manner.
- a cohesive connection is present if the material properties of one subarea, for example of the first subarea, flow into the physical properties of another subarea, for example the further subarea or the third subarea.
- This transition region is also referred to as a mixing sub-region in the case of an indirect connection.
- both the materials of one, for example the first subarea and at least partially the materials of the second, for example the further subarea or the third subarea are juxtaposed.
- the mixing section preferably forms a mixture of the materials and thus usually also the properties of the two mixed sections.
- the materials of the two subregions preferably enter into compounds at the atomic or molecular level.
- the at least one first portion contains at least 60 wt .-%, preferably at least 70 wt .-%, or preferably at least 90 wt .-%, or preferably to 100 wt .-%, based on the total weight of the first portion a non-magnetic material.
- This is preferably a non-magnetic ceramic or a non-magnetic metal.
- a non-magnetic material is meant a material having a magnetic permeability of less than 2 ⁇ . Such a material regularly has no ferromagnetic properties.
- a ferromagnetic material is understood as meaning a material which has a magnetic permeability of more than 2 ⁇ .
- the at least one first portion includes the non-magnetic ceramic in a range of 60 to 100 wt%, or preferably in a range of 70 to 100 wt .-%, or preferably in a range of 80 to 100 wt .-%, based on the total weight of the first portion. Further preferably, the at least one first portion includes the non-magnetic ceramic to 100 wt .-%, based on the total weight of the first portion.
- the non-magnetic ceramic can be any ceramic that would be selected by a person skilled in the art for the pumping device according to the invention.
- the ceramic is preferably selected from the group consisting of an oxide ceramic, a silicate ceramic, a non-oxide ceramic or a mixture of at least two thereof.
- the oxide ceramic is preferably selected from the group consisting of a metal oxide, a semi-metal oxide or a mixture thereof.
- the metal of the metal oxide may be selected from the group consisting of aluminum, beryllium, barium, calcium, magnesium, sodium, potassium, iron, zirconium, titanium or a mixture of at least two thereof.
- the metal is preferably selected from the group consisting of alumina (A1 2 0 3), magnesium oxide (MgO), zirconium oxide (Zr0 2), yttrium oxide (Y 2 0 3), aluminum titanate (Al 2 Ti0 5), a piezoelectric ceramic such as lead Zirconate (PbZr0 3 ), lead titanate (PbTi0 3 ) and lead zirconate titanate (PZT) or a mixture of at least two thereof.
- the semimetal of the semimetal oxide is preferably selected from the group consisting of boron, silicon, arsenic, tellurium or a mixture of at least two thereof.
- a steatite Mg 3 [Si 4 Oio (OH) 2 ]
- cordierite Mg, Fe 2+
- the non-oxide ceramic is preferably selected from the group consisting of a carbide, a nitride or a mixture thereof.
- the carbide is preferably selected from the group consisting of silicon carbide (SiC), boron carbide (B 4 C), titanium carbide (TiC), tungsten carbide, cementite (Fe 3 C).
- the nitride is preferably selected from the group consisting of silicon nitride (Si 3 N 4 ), aluminum nitride (AlN), titanium nitride (TiN), silicon aluminum oxynitride (SIALON) or a mixture of at least two thereof.
- the at least two further subregions contain at least 25% by weight, preferably at least 30% by weight, preferably at least 40% by weight, or preferably at least 60% by weight, based on the total weight of the further subregions, at least one ferromagnetic material.
- the ferromagnetic material is preferably distributed uniformly in at least one part of the at least two further subregions.
- At least one further subregion of the at least two further subregions may have at least one first subregion and at least one second subregion.
- the at least one first subregion and the at least one second subregion preferably contain the ferromagnetic material in different amounts.
- a plurality of first and second sub-areas alternate.
- the first subregions include a lower content of ferromagnetic material than the second subregions.
- the first and second subregions are arranged with different content of ferromagnetic material in the form of layers in at least one of the at least two further subregions.
- the at least one first subregion comprising more of the ferromagnetic material includes as the at least one second sub-region, the ferromagnetic material preferably contains at least 50 wt .-%, or preferably in a range of 60 to 100 wt .-%, or preferably in a range of 70 to 95 wt .-%, or preferably in a range of 75 to 90 wt .-%, based on the total weight of the first sub-range.
- the at least one second subregion, with less ferromagnetic material preferably contains the ferromagnetic material in a range of 0 to 40 wt.%, Or preferably in a range of 0 to 30 wt.%, Or preferably in a range of 0 to 20% by weight, based on the total weight of the second sub-area. More preferably, the Resistance between two adjacent first sub-regions, formed by an intermediate second sub-region, more than 1000 ohms, or preferably more than 10000 ohms, or preferably more than 100000 ohms. The resistance between two adjacent first subregions can be determined as volume resistance. In this case, the two contacted first sub-areas are not in direct contact with each other. They are separated from a second subarea.
- the subregions including more and less ferromagnetic material preferably further include a ceramic material.
- the ceramic material is the same as described for the first part.
- the at least 25% by weight of ferromagnetic material of the at least two further subareas are determined in each case for each further subarea by averaging the content of the first subregions and the content of the second subregions of ferromagnetic material.
- the at least two further subregions contain on average the ferromagnetic material in a range from 25 to 100 wt.%, Or preferably in a range from 40 to 95 wt.%, Or preferably in a range from 60 to 90 wt. , relative to the total weight of the respective further subarea.
- the second subarea is in direct contact with the first subarea.
- the second subregion is preferably in contact with at least 20% of the surface, preferably with at least 40%, or preferably with at least 60%, of the respective subregion with a first subregion.
- the at least one first subregion and the at least one second subregion are configured in the form of layers.
- the thickness of the layers is preferably in a range of 1 to 1000 ⁇ , or preferably in a range of 10 to 500 ⁇ , or preferably in a range of 50 to 250 ⁇ .
- the at least one first sub-area and the at least one second sub-area preferably has two surfaces running parallel to one another.
- at least one of the surfaces of the first subregion is in contact with at least one surface of the second subregion. This surface is also referred to as Maisfiambae.
- the second subregion is in contact with at least 50%, preferably with at least 60%, or preferably with at least 70%, of the respective contact surface of the respective subregion with a first subregion.
- the at least one third portion includes a metal content in a range of 40 to 90% by weight, preferably in a range of 45 to 85% by weight, or preferably in a range of 50 to 80% by weight, based on the Total weight of the third subarea.
- the at least one first subregion, the at least two further subregions and the at least one third subregion can be arranged in different ways within the pump housing. Preferably, there is no direct contact between the at least one third subregion and the at least two further subregions.
- the at least one third subregion and the at least two further subregions are preferably separated from one another by at least one first subregion. Further preferably, in each case a third subregion is arranged at the inlet and the outlet of the pump housing of the pumping device.
- the housing preferably has the shape of a tube with a straight inner wall. Projections may protrude on the outer wall of the housing, which is formed either from at least one of the at least one first partial regions or from at least one of the at least two further partial regions or from a combination of both types of partial regions. Examples of the arrangement of the various subregions in cross section, including the protuberances, are shown in FIGS. 3a, 3b, 3c, 4a and 4b.
- Each transition from one subarea to another subarea can be along a straight or curved line.
- the transition from one partial area to another partial area may take place irregularly, for example in the form of one or more steps or a zigzag line.
- At least one surface of the at least one first partial region points towards the inner region of the pump housing.
- at least one surface of the at least one third subregion points toward the inner region of the pump housing.
- the at least one first subregion, the at least two further subregions or the at least one third subregion can each form the entire wall thickness in a cross section in the plane of the pump housing at at least one position along the longitudinal extent of the pump housing.
- one part of the wall thickness may include the first partial area and the other part of this wall thickness may include at least one further partial area or at least a third partial area.
- the at least one first partial area completely surrounds at least one of the at least two further partial areas.
- the at least one first partial area preferably completely surrounds all of the at least two further partial areas.
- at least one surface of the first part region faces the outside of the pump housing.
- At least one surface of the at least one first partial area and at least one surface of at least one of the further partial areas to the outside of the pump housing.
- At least one surface of the at least one third subregion preferably faces the inside of the pump housing.
- at least one surface of the at least one third portion to the outside of the pump housing.
- At least the at least two further subregions in the form of protuberances in different spatial directions are away from the preferably cylindrical main body of the pump housing. Further preferably, the protuberances are arranged in a star shape around the main body of the pump housing.
- the pumping device also includes a rotor in the form of the impeller.
- the impeller may be of any shape that would be selected by one skilled in the art.
- the impeller preferably has a diameter in a range of 1 mm to 10 cm, preferably in a range of 3 mm to 5 cm, or preferably in a range of 5 mm to 3 cm.
- the impeller preferably has a thickness in a range of 0.1 to 50 mm, preferably in a range of 0.5 to 20 mm, or preferably in a range of 1 to 15 mm up.
- the diameter of the impeller is preferably smaller than the diameter of the pump housing in the plane of the impeller.
- the diameter of the impeller is preferably in a range of 1 to 10%, or preferably in a range of 1.5 to 8%, or preferably in a range of 2 to 7%, based on the diameter of the pump housing in the plane of the impeller , smaller than the diameter of the pump housing.
- the impeller preferably has at least two rotor blades, preferably at least three rotor blades, or preferably at least five rotor blades. Particularly preferably, the impeller has a number of rotor blades in a range of 2 to 20, preferably in a range of 5 to 15, or preferably in a range of 8 to 13.
- the impeller preferably has a central axis of rotation about which the impeller can be rotated. The axis of rotation is also called the axis of rotation.
- the at least two rotor blades are preferably arranged symmetrically about the axis of rotation of the impeller.
- the impeller is preferably arranged in the interior of the pump housing, wherein the axis of rotation of the impeller is provided parallel to the longitudinal extent of the wall of the tube.
- the impeller may be made of any material that would be selected by a person skilled in the art for use in the pumping device according to the invention.
- the impeller includes at least one element, the element having hard magnetic properties.
- a hard magnetic property means that a material obtains a permanent magnetization after exposure of this material in a magnetic field. After the magnetic field has dropped, the magnetization of the hard magnetic material continues. Materials with hard magnetic properties can be used as permanent magnets.
- the at least one element is preferably arranged on the impeller such that the impeller is moved when the at least one element is alternately attracted or repelled by two independent electric or magnetic fields.
- the impeller preferably includes at least two elements with hard magnetic properties.
- the elements are used with hard magnetic properties to the impeller as possible without further aids, such as bearings or other fixations in the pump housing Store without contact in the pump housing. This allows a particularly low-friction and particularly low-wear operation.
- the at least one element can be realized for example by at least one rotor blade, which includes a hard magnetic material.
- a hard magnetic element may be arranged on at least one rotor blade.
- the hard magnetic element is provided in the core of the impeller.
- the at least one hard magnetic element preferably includes at least one magnetizable material, e.g. a material selected from the group consisting of iron, cobalt, nickel, chromium dioxide or a mixture of at least two thereof.
- the at least one element can be arranged, for example, in the form of a coating of hard magnetic material on at least one rotor blade or in the interior of the impeller.
- the element contains at least 10 wt .-%, or preferably at least 20 wt .-%, or preferably at least 30 wt .-%, based on the total weight of the element, a hard magnetic metal.
- the element comprises a cobalt-chromium alloy or a platinum-cobalt alloy, in particular a platinum-cobalt alloy (PtCo23) with a proportion of cobalt of 23 wt .-% based on the total weight of the alloy in a range from 10 to 100% by weight, or preferably in a range from 20 to 100% by weight, or preferably in a range from 30 to 100% by weight, based on the total weight of the element.
- PtCo23 platinum-cobalt alloy
- the impeller may be coated on its outside, in particular on the outer surface of the rotor blades, with a biocompatible material. Suitable biocompatible materials are described further below.
- the impeller is preferably arranged in the inner region of the pump housing, which is preferably surrounded by the first portion.
- the impeller is preferably arranged with its axis of rotation parallel to the longitudinal extent of the wall. Furthermore, the impeller can be aligned by a magnetic field in the pump housing.
- the at least one third subregion comprises at least 60% by weight, preferably at least 70% by weight, or preferably at least 80% by weight, based on the total weight of the third subregion, at least one non-magnetic material.
- the non-magnetic material includes a non-magnetic metal.
- the non-magnetic metal of the third subregion is selected from the group consisting of platinum (Pt), palladium (Pd), stainless steel (AISI 304, AISI 316 L), iridium (Ir), niobium (Nb), Molybdenum (Mo), tungsten (W), titanium (Ti), chromium (Cr), tantalum (Ta) and zirconium (Zr) or a mixture of at least two thereof.
- the metal is selected from the group consisting of titanium, niobium, molybdenum, cobalt, chromium, tantalum and their alloys or a mixture of at least two thereof.
- the at least one third subregion may comprise further materials.
- the further material may be selected from the group consisting of a ceramic, a cermet or a mixture thereof.
- the ceramic of the third subregion can be any ceramic that would be selected by a person skilled in the art for a pumping device.
- the ceramic is preferably selected from the group consisting of an oxide ceramic, a silicate ceramic, a non-oxide ceramic or a mixture of at least two thereof.
- the ceramic of the at least one third subregion can be selected from the same group as the ceramics listed for the first subregion.
- the at least one third subarea preferably has the same ceramic as the at least one first subarea.
- the at least one third portion includes the ceramic preferably in a range of 1 to 60 wt%, or preferably in a range of 5 to 55 wt%, or preferably in a range of 10 to 45 wt% on the total weight of the third subarea. The sum of all constituents of the at least one third subregion always yields 100% by weight.
- a selection for the ceramic constituents and the metallic constituents of the cermet can be composed of those which are specified for the at least one first or the at least two further partial regions.
- the at least one third subregion comprises at least 5% by weight, preferably at least 7% by weight, or preferably at least 10% by weight, more metal content than the at least one first partial area, based on the total weight of the first partial area.
- the pump housing includes at least 10 wt .-%, preferably at least 15 wt .-%, or preferably at least 20 wt .-%, based on the total weight of the pump housing, more on the at least a first portion than on the at least one third subarea.
- the pump housing includes a first portion, at least two further portions and two third portions.
- the two third partial regions preferably extend over the entire thickness of the pump housing wall.
- the two third sections are arranged at the inlet and the outlet.
- the at least one first partial region preferably has a width, based on the longitudinal extent of the pump housing, in a range from 1 to 100 mm, preferably in a range from 2 to 70 mm, or preferably in a range from 3 to 50 mm.
- the at least one third subregion preferably has a width, based on the longitudinal extent of the pump housing, in a range of 0.25 to 80 mm, preferably in a range of 0.5 to 60 mm, or preferably in a range of 1 to 40 mm on.
- the pump housing includes at least one tube.
- the tube is straight.
- the tube may have at least one bend.
- the tube is preferably closed except for the inlet and the outlet. This means that the tube preferably has no further openings apart from the two openings at the inlet and outlet.
- the dimensions, materials and configurations preferably correspond otherwise to those of the previously described pump housing.
- at least a third subregion is provided at the inlet or the outlet. Further preferably, a third subregion is provided at the inlet and the outlet.
- the pump housing includes at its two ends in each case a third portion of equal size.
- the two third partial regions preferably have a width in a range from 1 to 10 mm, or preferably in a range from 2 to 8 mm, or preferably in a range from 2.5 to 6 mm.
- a first portion has a width of 5 to 40 mm, preferably in a range of 10 to 30 mm, or preferably in a range of 15 to 25 mm.
- the pump housing at the inlet and / or outlet at least a different inner diameter compared to the other inner diameter of the pump housing.
- the different inner diameter can be achieved either by wall thicknesses of different thicknesses or by different arrangement or geometry of the third partial areas with respect to the at least one first partial area.
- the pump housing includes at least one cross section, which is preferably selected from the group consisting of circular, rectangular, polygonal or ellipsoidal.
- the pump housing has an elongated shape at least in a first section.
- the pump housing may include at least one further portion whose shape deviates from the first portion of the pump housing.
- the total length of the pump housing is 1.5 to 10 times, preferably 2 to 9 times, or preferably 2.5 to 8.5 times longer than the diameter of the pump housing.
- the length of the pump housing is determined along the outer wall of the pump housing in the pumping direction.
- the pump housing preferably has a length in a range of 1 mm to 10 cm, or preferably in a range of 2 mm to 8 cm, or preferably in a range of 5 mm to 5 cm.
- the pump housing preferably has an inner diameter in a range of 0.1 to 50 mm, or preferably in a range of 0.5 to 30 mm, or preferably in a range of 1 to 20 mm.
- the pump housing has a volume in a range of 0.1 cm 3 to 10 cm 3 , preferably in a range of 0.2 to 9 cm 3 , or preferably in a range of 0.5 to 5 cm 3 up.
- the volume of the pump housing is defined by the interior surrounded by the pump housing.
- the wall of the pump housing preferably has a thickness in a range of 0.1 to 10 mm, or preferably in a range of 0.3 to 8 mm, or preferably in one Range from 0.4 to 6 mm. In the following, either wall thickness or wall thickness is used in this context.
- the wall thicknesses can vary in at least one of the first, the further or the third partial regions. An increase in the wall thickness at at least one point of the pump housing may serve to maintain the impeller at least in one direction at its position in the pump housing.
- the wall in particular the at least one wall surface of the pump housing, is preferably smooth.
- Smooth means that the wall of the pump housing has a roughness in a range of 0.025 to 4 Ra, or preferably in a range of 0.05 to 3 Ra, or preferably in a range of 0.07 to 1 Ra.
- the method for determining the roughness is described in the measuring methods and is specified in DIN EN ISO 4288.
- each further subregion is surrounded by at least one electrical coil.
- the impeller in the interior of the pump housing is preferably aligned by magnetic fields from the electrical coils on the outside of the pump housing.
- the coils preferably include an electrically conductive material.
- the electrically conductive material of the coils is selected from the group consisting of iron (Fe), copper (Cu), gold (Au), silver (Ag), platinum (Pt), palladium (Pd), titanium (Ti), chromium (Cr), cobalt (Co), tungsten (W) or a mixture of at least two thereof.
- the electrically conductive material includes copper (Cu).
- the pumping device according to the invention preferably includes at least two coils, preferably at least three coils, or preferably at least four coils.
- the coils are preferably arranged on the outside of the pump housing, wherein the coils and the impeller preferably lie in one plane. They are then arranged on the outside of the pump housing around the impeller.
- the non-magnetic material of the at least one first portion selected from the group consisting of a cermet, alumina (Al 2 O 3 ), zirconia (Zr0 2 ), an alumina-containing zirconia (ATZ), a Containing zirconium oxide Aluminum oxide (ZTA), an yttrium-containing zirconium oxide (Y-TZP), aluminum nitride (A1N), magnesium oxide (MgO), a piezoceramic, barium (Zr, Tfjoxid, barium (Ce, Tfjoxid and sodium-potassium niobate, a platinum Alloy, a palladium alloy, a titanium alloy, a niobium alloy, a tantalum alloy, a molybdenum alloy, a stainless steel (AISI 304, AISI 316 L) or a mixture of at least two thereof at least a first portion always gives 100 cermet, alumina (Al 2 O 3 ),
- a "cermet" is understood as meaning a composite material of one or more ceramic materials in at least one metallic matrix or a composite material of one or more metallic materials in at least one ceramic matrix Powder and at least one metallic powder may be used, which may for example be treated with at least one binder and optionally at least one solvent
- a selection for the ceramic constituents and the metallic constituents of the cermet may be composed of those specified for the first portion
- a nonmagnetic cermet is a composite of a nonmagnetic ceramic and a nonmagnetic metal, as mentioned later, In the cermet, the metal is preferably still present as a metallic component and may be a ls such are proven. Because of this metallic component, a cermet usually has a higher electrical conductivity than the pure ceramics.
- the at least one first portion includes a non-magnetic metal in a range of 40 to 90 wt .-%, preferably in a range of 50 to 90 wt .-%, or preferably from 60 to 90 wt .-%, based on the total weight of at least a first portion.
- the non-magnetic metal is selected from the group consisting of platinum (Pt), palladium (Pd), iridium (Ir), niobium (Nb), molybdenum (Mo), tungsten (W), Titanium (Ti), chromium (Cr), tantalum (Ta), zirconium (Zr), alloys of the aforesaid metals, gold (Au), non-magnetic stainless steel (eg AISI 304, AISI 316 L) or a mixture of at least two thereof.
- the non-magnetic metal may preferably be selected from the group consisting of titanium (Ti), platinum (Pt), tantalum (Ta), niobium (Nb) or a mixture of at least two thereof.
- the further non-magnetic material may preferably be a non-magnetic ceramic or a non-magnetic cermet as described above at least 60 wt .-% non-magnetic material, based on the total weight of the first sub-range to be supplemented.
- the ferromagnetic material of the at least two further subregions is selected from the group consisting of iron (Fe), cobalt (Co), nickel (Ni), chromium dioxide (CrO 2 ), an iron alloy, an iron Nickel alloy, iron-silicon alloy, iron-cobalt alloy, nickel alloy, aluminum-nickel alloy, cobalt alloy, cobalt-platinum alloy, cobalt-chromium alloys, a neodymium-iron-boron alloy, a samarium-cobalt alloy or a mixture of at least two thereof.
- the at least two further portions of the pump housing preferably contain a metal content in a range of 25 to 90 wt .-%, preferably in a range of 40 to 85 wt .-%, or preferably in a range of 50 to 80 wt .-%, based on the total weight of the respective further subarea.
- At least one of the at least two further subregions further comprises a component selected from a ceramic, a metal or a mixture thereof.
- the ceramic is preferably selected from the group of ceramics which are specified for the first subregion.
- At least one of the at least two partial regions preferably has the same ceramic as the first partial region.
- the at least two further subregions preferably include the ceramic in a range of 1 to 75 wt .-%, or preferably in a range of 2 to 70 wt .-%, or preferably in a range of 5 to 60 wt .-%, based on the total weight of the respective further subarea.
- the further metal may include a metal that has no ferromagnetic properties. these are preferably the metals that were also specified for the first or the third sub-range. The sum of all components of the further sub-range always gives 100 wt .-%.
- the further metal is at least one of the at least two further subregions selected from the group consisting of platinum (Pt), palladium (Pd), iridium (Ir), niobium (Nb), molybdenum (Mo), tungsten (W), titanium (Ti), chromium (Cr), a cobalt-chromium alloy, tantalum (Ta) and zirconium (Zr) or a mixture of at least two thereof.
- the at least one first portion contains less than 10 wt .-%, preferably less than 8 wt .-%, or preferably less than 5 wt .-% of metal, based on the total weight of the first portion ,
- the at least one first partial area and / or at least one of the at least two further partial areas is connected in a materially bonded manner to at least one third partial area.
- at least one first subregion is adhesively bonded to two further subregions.
- at least one first partial region is preferably connected in a material-locking manner to all other partial regions.
- the at least one first subregion is adhesively bonded to at least one third subregion.
- the at least one first subregion is adhesively connected to two, or preferably to all third subregions.
- the pump device is at least partially surrounded by a component housing, wherein preferably at least a part of the at least one third portion of the pump device is connected to the component housing.
- the connection of the component housing with at least a part of the third portion of the pump housing preferably leads to a closed space between the component housing and the pump housing.
- the interior of the component housing of the pumping device is hermetically sealed against the environment.
- the pump device according to the invention can be used in particular in a body of a human or animal user, in particular a patient.
- An inserted pumping device is usually exposed to a fluid of a body tissue of the body.
- the component housing of the medically implantable device and thus also the component housing and the pump housing of the pumping device according to the invention, should have a complete impermeability, in particular to body fluids.
- the pumping device according to the invention in particular the connection of component housing with pump housing, is preferably hermetically sealed.
- the interior of the pumping device is hermetically sealed against the outside space.
- hermetically sealed means that, when used as intended, moisture and / or gases can not penetrate the hermetically sealed connection within a customary period of five years, a physical quantity for determining the tightness of a connection or a component Leakage tests can be performed by leak testing, and leak tests will be carried out with helium leak testers and / or mass spectrometers and are specified in the MÜ-STD-883G Method 1014.
- the maximum allowable helium leak rate will depend on the internal volume of the device under test According to the methods specified in MIL-STD-883G, Method 1014, paragraph 3.1, and taking into account the volumes and wells of the devices to be tested used in the practice of the present invention, the maximum allowable helium leakage rate for the inventive P Enclosed housing 10 7 atm * cm 3 / sec.
- the device to be tested for example the component housing and / or the pumping device according to the invention or the component housing with the connected pump housing
- the helium leak rate of less than 1 x 10 "8 atm * cm 3 / sec, in particular less than 1 x 10" 9 atm * 3 cm / sec.
- said helium leak rates may also be converted to the equivalent standard air leak rate.
- the pump device preferably has, in addition to the impeller, the pump housing with at least one first, at least two further partial area and at least one third partial area, a component housing in which further components of the pump device can be located.
- the other components of the pump device are preferably selected from the group consisting of a battery, a coil, a control unit, a vascular connection unit or a combination of at least two thereof.
- the component housing contains titanium to at least 30 wt .-%, preferably at least 50 wt .-%, or preferably at least 80 wt .-%, each based on the total weight of the component housing. More preferably, the component housing includes titanium at least
- the component housing may preferably include at least one other metal.
- the other metal may be selected from the same group as the metal of the other part.
- the other metal is preferably selected from the group consisting of Fe, Al, V, Sn, Co, Cr, CoCr, Nb, stainless steel, Mb, Ti b or a mixture of at least two thereof.
- the device package may preferably contain the further metal in a range of 1 to 70 wt%, or preferably in a range of 5 to 50 wt%, or preferably in a range of 10 to 20 wt%. The sum of all components of the component housing always results
- Suitable titanium grades are given in ASTM B265-05,: 2011, for example Grade 1 to 6.
- the wall of the pump housing has a magnetic permeability of less than 2 ⁇ , preferably less than 1.9 ⁇ , or preferably less than 1.8 ⁇ . Magnetic permeability is determined in accordance with standard ASTM 773,: 2009, variant 01.
- a surface of the wall which faces the interior of the pump housing, a Vickers hardness of at least 330 HV, preferably at least 350 HV, or preferred at least 370 HV on.
- the entire wall has a hardness in the specified areas.
- At least the surface of the at least one first and the at least one third portion also have a Vickers hardness of at least 330 HV, preferably at least 350 HV, or preferably at least 370 HV.
- the hardness is not higher than 2000 HV, or preferably not higher than 1500 HV.
- the hardness of at least the surface of the at least one first subregion is preferably in a range from 330 to 2000 HV, or preferably in a range from 350 to 1800 HV. Furthermore, at least the surface of the at least one first partial region preferably has a hardness that is at least as great as the hardness of the rotor surfaces of the impeller. See measuring methods (DIN ISO 6507 from March 2006, test load: lKg, exposure time: 15 sec, test temperature: 23 ° C +/- FC)
- At least the surface of the at least one first portion has a hardness which is at least 20 HV, or preferably at least 30 HV, or preferably at least 40 HV higher than the hardness of Vickers rotor surfaces of the impeller.
- the near-surface material layer is in a range of 0.01 to 2.5 mm, preferably in a range of 0.05 to 1.0 mm, or preferably in one Range of 0.1 to 0.5 mm, each perpendicular to the surface understood.
- At least the surface of the at least one third subregion preferably has a hardness which is at least 20 HV, or preferably at least 30 HV, or preferably at least 40 HV, higher than the hardness of Vickers of the rotor surfaces of the impeller. If a part of a further partial area points towards the inner area of the pump housing, preferably at least the surface of this at least one further partial area has a hardness which is at least 20 HV, or preferably at least 30 HV, or preferably at least 40 HV higher than that Hardness according to Vickers of the rotor surfaces of the impeller.
- At least the outer surfaces of the component housing and the surface facing the inner region of the pump housing are biocompatible. This is particularly preferred when the pumping device is for implantation in a living body, such as a human or animal. Biocompatibility is determined and assessed in accordance with standard ISO 10993: 2002, Part 4. In general, the surfaces facing the interior of the pump housing and the outer surfaces of the component housing after implanting the pumping device according to the invention in a living body with the compassionfiüsstechnik come into contact. The biocompatibility of surfaces in contact with body fluid helps prevent the body from being damaged on contact with these surfaces.
- Suitable biocompatible materials are all ceramics mentioned for the first subarea.
- a material is biocompatible if it satisfies the requirements of standard 10993-4: 2002, as mentioned in the biocompatibility measurement methods.
- Another object of the present invention is a method for producing a pump housing for a pumping device comprising the steps:
- step e. Treat the pump housing precursor at a temperature of at least 300 ° C.
- the provision of the first material in step a., Of the further material in step b. and the third material in step c. can be done in any manner that the skilled person would choose for this purpose.
- Forming the pump housing precursor in step d. can be done in any manner that would be selected by the person skilled in the art for the purpose of forming a first subarea and a further subarea.
- step d a shaping process, preferably selected from the group consisting of a lithographic process, injection molding, machining, extrusion or a combination of at least two thereof.
- a lithographic process various layers of one or more materials are sequentially introduced into a mold.
- the lithographic process preferably corresponds to a layered screen printing process.
- a sieve consisting of a dimensionally stable as possible material, such as wood; Metal, preferably steel; a ceramic or a plastic with a selected mesh size on the object to be overlaid or over the object to be overlaid arranged.
- On this sieve is applied via a nozzle or from a container used for applying or superimposing pressure mass, for example in the form of a paste or a powder, and pressed with a squeegee through the mesh of the sieve.
- a uniform film of the printing material used for overlaying can be applied or areas with little or no pressure applied for application can alternate with areas with a large amount of pressure applied for application.
- a uniform film of the printing material used for superimposing is transferred to the surface.
- the screen meshes can also be partially closed by suitably applied materials (copy layers, screen printing stencils) so that the printing composition is transferred only in defined areas with open meshes to the surface to be coated so as to obtain, for example, a defined structure such as a pattern.
- screening thin films with defined openings can be used to transfer the printing mass. By repeating this process with one and the same material or different materials, 3-D structures can be obtained.
- Injection molding is a molding process for at least one material to obtain a shaped solid.
- the person skilled in the art knows various injection molding methods and also tools and conditions used in injection molding from the prior art.
- the injection molding may be selected from the group consisting of a multi-component injection molding, a powder injection molding, an injection-compression molding, an extrusion injection molding, a vacuum injection molding or a combination of at least two thereof. Machining can be combined with any other molding process.
- cutting tools such as a drill or a punch. During structuring, part of the material is removed. As a result, massive bodies can be formed into hollow bodies, for example.
- machining may also be a processing step after manufacturing a pump housing or housing.
- polishing may also take place following the manufacture of the pump housing.
- a first material for forming a first portion is brought into contact with another material for forming the further portion and a third material for forming a third portion.
- the contacting preferably takes place in the form of injection molding, in which successively first the further material is injected into a mold made of metal and then the first and the third material.
- the further material is introduced into the mold in several steps.
- a first further material with a low content of ferromagnetic material is introduced alternately to a second further material with a high content of ferromagnetic material.
- the first further material has the ferromagnetic material in a range from 20 to 100% by weight more than the second further material, based on the total weight of the second further material.
- the other components, such as the ceramic component of the first further and the second further material can also be taken from the description for the pumping device.
- the alternating shaping of first further material and second further material preferably forms the at least two further portions of the pump housing precursor.
- the content of ferromagnetic material results from the averaging of the content of the first further materials and the content of the second further mixture of ferromagnetic material.
- the first and second additional materials are formed during the treatment in step e.
- the third material may be injected into the mold first, then the further, eg in the form of layers of first further and second further material, and finally the first material.
- the proportions of the first, further and third materials preferably correspond to the quantitative ratios in the first, further and third subregions, as described above in connection with the first article, the pumping device according to the invention.
- the first, the further and the third material may contain additives.
- the pump housing precursor already has the shape of the pump housing after contacting.
- the three materials form a continuous form. The contacting may involve one or more further steps.
- any substance may be selected which the person skilled in the art would select as an additive for the first material, the further or the third material.
- the additive is preferably selected from the group consisting of water, a dispersant, a binder or a mixture of at least two thereof.
- the dispersant preferably contains at least one organic substance.
- the organic substance preferably has at least one functional group.
- the functional group may be a hydrophobic or a hydrophilic functional group.
- the functional group may be selected from the group consisting of an ammonium group, a carboxylate group, a sulfate group, a sulfonate group, an alcohol group, a multiple alcohol group, an ether group or a mixture of at least two of them.
- the dispersant preferably has functional groups in a range of 1 to 100, or preferably in a range of 2 to 50, or preferably in a range of 2 to 30.
- Preferred dispersants are from Byk-Chemie GmbH, DOLAPIX CE 64 & Zschimmer & Schwarz GmbH & Co KG under the trade name DISPERBYK ® 60th
- the binder is preferably selected from the group consisting of a methylcellulose, a thermoplastic polymer, a thermosetting polymer and a wax or a mixture of at least two thereof.
- the methylcellulose is preferably selected from the group consisting of hydroxypropylmethylcellulose (HPMC), hydroxyethylmethylcellulose (HEMC), Ethylmethylcellulose (EMC) or a mixture thereof.
- HPMC hydroxypropylmethylcellulose
- HEMC hydroxyethylmethylcellulose
- EMC Ethylmethylcellulose
- HPMC hydroxypropylmethylcellulose
- the methylcellulose contains hydroxypropylmethylcellulose in a range of 80 to 100% by weight, or preferably in a range of 90 to 100% by weight, or preferably in a range of 95 to 100% by weight .-%, based on the total weight of methyl cellulose.
- the methylcellulose has a content of -OCH 3 groups in a range of 20 to 40 wt .-%, or preferably in a range of 23 to 37 wt .-%, or preferably in a range of 25 to 35 wt .-% , based on the total weight of methylcellulose.
- the methylcellulose has a content of -OC 3 H 6 OH groups in a range of 1 to 12 wt .-%, or preferably in a range of 3 to 9 wt .-%, or preferably in a range of 4 to 8 Wt .-%, based on the total weight of methylcellulose.
- the thermoplastic polymer may be selected from the group consisting of acrylonitrile-butadiene-styrene (ABS), polyamides (PA), polylactate (PLA), polymethyl methacrylate (PMMA), polycarbonate (PC), polyethylene terephthalate (PET), polyethylene (PE), Polypropylene (PP), polystyrene (PS), polyetheretherketone (PEEK) and polyvinylchloride (PVC) or a mixture of at least two of them.
- the thermosetting polymer may be selected from the group consisting of an aminoplast, an epoxy resin, a phenolic resin, a polyester resin or a mixture of at least two thereof. Waxes are hydrocarbon compounds that melt above 40 ° C without decomposition.
- the first material for the at least one first portion includes at least one of the aforementioned additives preferably in a range of 0.1 to 10 wt%, or preferably in a range of 0.2 to 8 wt%, or preferably in one Range of 0.5 to 5 wt .-%, based on the total weight of the first material.
- the further material for the at least two further subregions preferably contains at least one of the abovementioned additives in an amount in a range from 0.1 to 5% by weight, or preferably in a range from 0.2 to 2% by weight, or preferably in a range of 0.3 to 1 wt .-%, each based on the total weight of the further material.
- the third material for the at least a third portion includes at least one of the aforementioned additives preferably in a range of 0.1 to 10 wt%, or preferably in a range of 0.2 to 8 wt%, or preferably in one Range of 0.5 to 5 wt .-%, based on the total weight of the third material.
- the treatment of the pump housing precursor in step e. may be done in any manner that a person skilled in the art would select for the purpose of heating the pump housing precursor to at least 300 ° C.
- at least a portion of the treatment of the pump housing precursor takes place at a temperature in a range of 300 to 2500 ° C, or in a range of 500 to 2000 ° C, or in a range of 700 to 1800 ° C.
- the Treatment of the Pumpengepatusevorierirs at elevated temperature preferably escapes at least a portion of the binder.
- the treatment of the Pumpengeophusevor essencers can be done for example in an oxidative atmosphere, a reductive atmosphere or under a protective atmosphere.
- an oxidative atmosphere may contain oxygen, such as air or an oxygen / air mixture.
- a reductive atmosphere may contain hydrogen.
- a protective atmosphere preferably contains neither oxygen nor hydrogen. Examples of protective atmospheres are nitrogen, helium, argon, krypton or mixtures thereof. The choice of atmosphere may be dependent on the materials to be treated. The person skilled in the appropriate choice of the atmosphere for the mentioned materials is known. It is also preferable to successively select combinations of different atmospheres for different periods of time.
- the treatment of the pump housing precursor in step e. can be done either in one step or preferably in more than one step.
- the pump housing precursor is preferably used in a first substep of step e. to a temperature in a range of 301 to 600 ° C, or preferably in a range of 350 to 550 ° C, or preferably in a range of 400 to 500 ° C.
- This first sub-step of the treatment step e. may be over a period of time in a range of 1 to 180 minutes, preferably in a range of 10 to 120 minutes, or preferably in a range of 20 to 100 minutes.
- This sub-step can be accomplished either by introducing the pump housing precursor from step d.
- step e Preference is given to the treatment in the first substep of step e. of the pump housing precursor is made in one step to a temperature in a range of 301 to 600 ° C.
- the pump housing precursor is preferably at a temperature in a range of 800 to 2500 ° C, or preferably in a range of 1000 to 2000 ° C, or preferably heated in a range of 1100 to 1800 ° C.
- This sub-step can be done either by introducing the Pumpengeophusevorierirs from the first sub-step of step e. in a preheated atmosphere or by slow stepwise or steadily increased heating of the pump housing precursor.
- Preference is given to the treatment in the second substep of step e. of the pump housing precursor in a step to a temperature in a range of 800 to 2500 ° C.
- the treatment of the Pumpengekorusevorierirs in the second sub-step of step e. is preferably carried out over a period in a range of 1 to 180 minutes, preferably in a range of 10 to 120 minutes, or preferably in a range of 20 to 100 minutes.
- the shape of the pump housing after the manufacturing process is preferably continuous. This means that the pump housing next to the outlet and the inlet has no other openings or outlets, or other recesses.
- the pump housing has a rectilinear outer surface.
- the wall thicknesses can vary in at least one of the first or the further subregions. An increase in the wall thickness at at least one point of the pump housing may serve to hold the impeller at least in one direction at its position in the pump housing. The thickening of the wall thickness can either take place during the manufacturing process or subsequently. Additionally or alternatively, the pump housing may have constrictions.
- a pumping device is obtainable by inserting an impeller into a pump housing, arranging electromagnets with coils around the pump housing, producing a circuit incorporating a control device and a power source, eg a battery.
- the pump device according to the invention is surrounded by a component housing and the third portions of the pump housing with the Part housing cohesively connected. This can be done, for example, by a solder joint along the point of contact of the pump housing and component housing.
- Another object of the present invention is a pump housing for a pumping device obtainable by the inventive method described above.
- Another object of the present invention is a housing including a wall surrounding an interior area, the housing having an inlet and an outlet, the housing having at least a first portion, at least two further portions and at least a third portion; wherein the wall of the housing in at least one plane (Q) perpendicular to the longitudinal extent of the housing has at least a first portion and at least one further portion;
- the at least one first subregion comprises at least 60% by weight, based on the total weight of the at least one first subregion, of at least one nonmagnetic material
- the at least two further subregions contain at least 25% by weight, or preferably at least 40% by weight, or preferably at least 60% by weight, based on the total weight of the at least two further subregions, of at least one ferromagnetic material, wherein the at least one third subregion contains a metal content in a range from 40 to 90% by weight, based on the total weight of the third subregion,
- the housing corresponds in its shape, its composition and its other configuration of the pump housing, which has been previously described in connection with the pumping device according to the invention.
- the at least one first subarea and / or at least one of the at least two further subareas is connected in a materially bonded manner to at least one third subarea.
- at least one first subregion is adhesively bonded to two further subregions.
- at least one first subregion is adhesively bonded to all other subregions.
- the at least one first subregion is adhesively bonded to at least one third subregion.
- the at least one first subregion is adhesively connected to two, or preferably to all third subregions.
- a displaceable element is provided in the housing at least in a part of the housing. Further preferred embodiments of the housing correspond to the previously described embodiments of the pump device according to the invention.
- the displaceable element may be selected from the group consisting of a sphere, a cylinder, an air bubble or a combination of at least two thereof.
- the displaceable element preferably has a shape that corresponds to the diameter of the pump housing.
- the material of the displaceable element can be any that would be used by a person skilled in the art.
- the displaceable element includes a metal, a polymer, a ceramic or a mixture thereof.
- the metal or polymer may be selected from a metal, a polymer or a ceramic as described for the first portion of the pump housing.
- the displaceable element may serve, for example, to be displaced by a change in the fluid flow in the housing in its position in the housing.
- Another object of the present invention is a pumping device comprising at least one previously described housing or a pump housing obtainable by the method described above. measurement methods
- test loads and materials were determined according to the standard according to DIN EN ISO 6507- March 2006. The following test loads and exposure times were used: 1 kg, 15 seconds. The test temperature was 23 ° C ⁇ 1 ° C.
- the magnetic permeability was determined according to the standard ASTM A773 / A773 - 01 (2009).
- Biocompatibility is determined according to the standard of 10993-4: 2002.
- Leak tests will be carried out with helium leak testers and / or mass spectrometers.
- a standard measuring method is specified in the standard MÜ-STD-883G Method 1014.
- the maximum allowable helium leak rate is determined depending on the internal volume of the device to be tested. According to the methods specified in paragraph 3.1 of MIL-STD-883G, Method 1014, and taking into account the volumes and cavities of the devices to be tested in the application of the present invention, the maximum allowable helium leakage rate for the pump housings 10 7 according to the invention atm * cm 3 / sec or less.
- the device to be tested (for example the component housing and / or the pumping device or the component housing with the connected pump housing) has a helium leak rate of less than 1 ⁇ 10 -7 atm * cm 3 / sec.
- said helium leak rates may also be converted to the equivalent standard air leak rate.
- a voltmeter Benning MM 1-1
- the further material contains a mixture of 45 wt .-% of a Pt-Co-23 material from Heraeus Holding GmbH and 45 wt .-% alumina (Al 2 O 3 ) available from CeramTech GmbH, and 10 wt .-% of the binding agent METAWAX P-50 available from Zschimmer & Schwarz GmbH & Co.KG.
- Example 4 for the first subarea The first subarea contains 50% by weight of platinum powder from Heraeus Precious Metals GmbH & Co.KG and 50% by weight of aluminum oxide (Al 2 O 3 ) from CeramTech GmbH.
- the further subarea contains 50 alternating layers of 60 wt .-% of a Pt-Co-23 material from Heraeus Holding GmbH and each 40 wt .-% alumina (A1 2 0 3 ) available from CeramTech GmbH for all even-numbered layers ,
- the odd-numbered layers consist of 100 wt .-% alumina (A1 2 0 3 ) available from CeramTech GmbH.
- the even-numbered layers accordingly correspond to the first subregions of the subarea and the odd-numbered layers correspond to the second subregions of the subarea.
- the layers are 100 ⁇ thick in this example.
- the further subregions in this example include the ferromagnetic material on average at least 25% by weight, based on the total amount of the respective further subregions.
- the third subregion contains 60% by weight of platinum and 40% by weight of aluminum oxide (Al 2 O 3 ) from CeramTech GmbH.
- the particle sizes of the materials can be found in the product data sheet, which is available from the raw materials supplier and is often included in a delivery.
- the first material from Example 1 is first provided in a container according to the method according to the invention for the manufacture of a pump housing.
- the further material from Example 2 is also provided in a container.
- the third material of Example 3 is also provided in a container.
- the powders of the third, further material and first material may be placed in the mold as shown in Figure 5 and compressed with a die as shown in Figure 6.
- a pump housing precursor is obtained, which is first treated in a furnace at a temperature of 400 ° C and then sintered at a temperature of 1700 ° C to a pump housing with at least one first subregion with the composition according to Example 4, to obtain at least two further subregions having the composition from Example 5 and at least a third subregion having the composition from Example 6.
- Figure 1 is a schematic representation of a pump device according to the invention
- FIG. 2 is a schematic of a process for the preparation of a novel
- Figure 3a is a schematic representation of a pump housing according to the invention with a first and a plurality of further subregions adjacent to each other;
- Figure 3b is a schematic representation of a pump housing according to the invention with a first and a plurality of further subregions, wherein the first surrounds the other subregions;
- FIG. 3 c shows a schematic representation of a pump housing according to the invention with a first and a plurality of further subregions, wherein the subregions are designed as an alternating layer sequence;
- Figure 4a is a schematic representation of a pump housing according to the invention with a first and a plurality of further subregions, wherein two third
- Subareas are arranged adjacent to the first subarea
- Figure 4b is a schematic representation of a pump housing according to the invention with a plurality of first and a plurality of further sub-area adjacent to two third
- Figure 5 is a diagram of a pressing device for producing a
- FIG. 6 shows a diagram of a pressing device for producing a
- FIG. 1 schematically shows a pump device 10 which has a pump housing 20 in the form of a tube and a component housing 40.
- the outer surfaces 100 of the component housing 40 come into contact with the body, in particular for an implantable pump device 10, and are therefore preferably made biocompatible
- the pump housing 20 has a wall 21 which surrounds an interior region 50.
- the to Interior 50 facing surface of the pump housing 20 is referred to as the facing surface 102.
- the facing surface 102 comes into contact with the fluid and is therefore preferably made biocompatible, in particular for an implantable pump device 10.
- In the inner region 50 of the pump housing 20 is at least one impeller 80 in the pump housing 20.
- the pump housing 20 has a first portion 26 in the middle of the wall 21.
- the wall 21 or the pump housing 20 has a first third portion 30.
- the further end 24 in the form of the outlet 25, including the further opening 25.
- Adjacent to the first portion 26 protrude two further portions 28 and 28th 'away from the pipe upwardly and downwardly.
- a fluid in the pumping direction 240 can be pumped from the inlet 22 to the outlet 24.
- the component housing 40 and the pump housing 20 are other components, such as a battery 120 and a control unit 130.
- the coils 32 and 32 ' can either around the at least two further portions 28, 28 'may be arranged or located at another location in the component housing 40.
- the further partial regions 28, 28 ' are designed as protuberances from the otherwise tubular pump housing 20.
- a first material 60 is provided.
- the first material 60 is for example a mixture of at least two powders.
- the first material preferably contains the composition of Example 1.
- the further material 70 is used, for example, in the form of a mixture of Example 2 in step b. 210, as shown in FIG. 2a.
- the further material 70 may also be provided in the form of two different mixtures, wherein a first further material 72 is the ferromagnetic material in the form of Pt-Co-23 powder at 90% by weight and 10 Wt .-% binder METAWAX P-50 contains.
- the second additional material 74 contains 90% by weight of aluminum oxide (Al 2 O 3 ) powder and 10% by weight of the binder METAWAX P-50.
- the two mixtures that is to say the first further material 72 and the second further material 74, are alternately formed in this alternative in equal amounts to the further partial region 28, 28 '.
- the materials 70, 72 and 74 are placed in a mold via containers.
- the container may each be a metal container with a sieve passage.
- the powder grains preferably have a round to oval extent.
- the particle size specification D 50 means that not more than 50% of the particles are larger than the specified diameter.
- the particle size specification D90 means that not more than 90% of the particles are larger than the specified diameter.
- the grain size can be determined by various methods.
- the particle size is preferably determined by means of laser diffraction, light microscopy, optical single particle counting or a combination of at least two of these. Furthermore, the determination of the particle size as well as the particle size distribution is preferably carried out on the basis of individual optical evaluation of images by means of transmission electron microscopy (TEM).
- TEM transmission electron microscopy
- the third material 75 is in the form of a mixture of Example 3 in step c. 220 provided.
- the container can also be a metal container with a sieve passage here.
- a pump housing precursor 90 is formed from the first material 60, the further material 70 and the third material 75.
- Step d. 230 may be accomplished in two alternative ways to form the pump housing precursor 90.
- a further subregion 28 is formed by the further material 70, or the first further material alternately with the second further material.
- the further material 70, or the first further material and the second further material alternately, by means of a Teflon doctor with the dimensions 10 mm * 4 mm * 2 mm and a Rakel hardness of 50 shore in a first form of an aluminum oxide ceramic printed , The first form is open on one side.
- the first material 60 is pressed into a further shape and the third material 75 is pressed into a third shape as described for the further material.
- the further form and the third form are open to one side.
- the first material 60, the third material 75 and the further material 70 are compressed under a pressure of a weight of 10 kg.
- the three blanks are assembled to a pump housing precursor 90 at the open sides of the mold.
- the pump housing precursor is treated at a temperature of 400 ° C in air.
- the pump housing precursor 90 is treated at a temperature of 1700 ° C in the same furnace for 180 minutes, with subregions 30 sintered at 26 and 26 at 28 to form a pump housing.
- the result is a pump housing in the form of a round tube of at least a first portion and at least a third portion and protuberances at least two further portions.
- the inner diameter of the pump housing is for example 9 mm.
- step d the portions 30, 26 and 28, 28 ' are formed together in a mold 150 as shown in FIG.
- the material 75 for a third portion 30 is placed in the mold, then the material 60 is entered for a first portion 26 in the mold.
- material 70 for example in the form of the first further material 72 alternately with the second additional material 74, is entered into the mold for two or more further partial regions 28, 28 '.
- a lid or stamp 160 made of stainless steel is pressed onto the mold 150 to compress the portions, as shown in FIG.
- a weight of 10 kg is pressed onto the sub-area.
- the subregions 26, 28, 28 'and 30 together are first heated for 160 min in a heating oven from Heraeus Holding GmbH to 400 ° C in the mold.
- the pump housing precursor 90 is treated at a temperature of 1700 ° C in the same furnace for 180 minutes, with subregions 30 sintered at 26 and 26 at 28 to form a pump housing.
- the result is a pump housing in the form of a round tube of at least a first portion and two third portions and protuberances from the tube from at least two other portions.
- the inner diameter of the pump housing is for example 9 mm.
- FIG. 3 a shows a cross section (in a plane Q) through a pump housing 20 produced as described above.
- the core of the tubular pump housing 20 is formed by a first portion 26, in the four further portions 28 and 28 'protrude.
- the other portions 28 and 28 ' form protuberances from the Pump housing 20 in all four directions, in the form of a star.
- the layers are preferably formed alternately from the middle of the tube, predominantly along the direction of the protuberances 28, 28 '.
- An example of one of the protuberances 28, 28 'with preferred orientation with respect to the interior 50 is shown in Figure 3c.
- the surface of the inner region 50, consequently the surface 102 facing the inner region 50, is formed in this embodiment exclusively by a first partial region 26 and optionally one or two third partial regions (not shown here).
- FIG. 3b likewise shows a cross section (in the plane Q) through a pump housing 20 according to the invention.
- the arrangement of the other portions 28 and 28 ' are identical to those of Figure 3a and protrude in all directions in many directions of the tubular body of the pump housing to the outside.
- the further subregions 28, 28 ' in contrast to the further subregions 28, 28 ', the further subregions 28, 28' in the embodiment from FIG. 3b are surrounded by the first subregion 26.
- the entire outer surface of the pump housing 20 includes the first portion 26 and optionally one or two third portions (not shown) at the inlet and outlet.
- FIG. 3c shows an example of a possible embodiment of the protuberances 28, 28 'and thus also of the first subregions 76 and the further subregions 78 of the further subregions 28, 28 ' .
- the partial regions 28, 28 ' point radially away from the inner region 50 of the tubular pump housing 20.
- Parallel to the radial alignment of the partial regions 28, 28 ' the first subregions 76 and second subregions 78 of the respective protuberances 28, 28' extend alternately.
- the first subregions 76 and the further subregions 78 are stacked in the upwardly facing protuberance 28. In this example, 13 first subregions 76 alternate with 12 second subregions 78.
- the thickness of the first subregions 76 and the further subregions 78 can vary from 1 to 1000 ⁇ m. In this example, the thickness of all subregions is 100 ⁇ .
- All protuberances on the pump housing 20 preferably have the same geometry and the same arrangement of first subregions 76 and further subregions 78.
- FIG. 4 a again shows a pump housing 20 with protuberances from further subregions 28, 28 'from the tubular base body of the pump housing 20.
- the further partial regions 28 and 28 ' all protrude through the wall thickness of the pump housing 20 as far as the inner region 50.
- the inner region 50 therefore has on its facing surface 102 both parts of a first partial region 26, a third partial region 30 and parts of further partial regions 28, 28 'on.
- the third partial regions 30 protrude at the inlet 22 and the outlet 24 beyond the first partial region 26 to the openings.
- the third portions 30 are in direct contact only with the first portion 26.
- the embodiment from FIG. 4 b has the same shape and arrangement of the first 26 and further partial regions 28, 28 ' , with the difference that the further partial regions 28 and 28' extend in the longitudinal extent of the pump housing 20 as far as the third partial regions 30 ,
- the three different partial regions in the form of a third partial region 30, four further partial regions 28, 28 ' and four first partial regions 26 with each other stay in contact.
- FIG. 5 shows a mold 150 after it has been filled, as described above, by the materials 60, 70 and 75 for the first partial regions 26, the further partial regions 28, 28 ' and the third partial regions 30.
- the mold 150 may be, for example, a ceramic mold such as Al 2 O 3 .
- FIG. 6 shows the mold 150 from FIG. 5 closed by a cover 160.
- the lid 160 may be made of stainless steel, for example.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102014004121.2A DE102014004121A1 (de) | 2014-03-24 | 2014-03-24 | Pumpengehäuse aus mindestens drei unterschiedlichen versinterbaren Materialien |
| PCT/EP2015/056137 WO2015144643A1 (de) | 2014-03-24 | 2015-03-23 | Pumpengehäuse aus mindestens drei unterschiedlichen versinterbaren materialien |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3123032A1 true EP3123032A1 (de) | 2017-02-01 |
Family
ID=52727137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP15711750.8A Withdrawn EP3123032A1 (de) | 2014-03-24 | 2015-03-23 | Pumpengehäuse aus mindestens drei unterschiedlichen versinterbaren materialien |
Country Status (4)
| Country | Link |
|---|---|
| US (2) | US10655631B2 (de) |
| EP (1) | EP3123032A1 (de) |
| DE (1) | DE102014004121A1 (de) |
| WO (1) | WO2015144643A1 (de) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013211844A1 (de) | 2013-06-21 | 2014-12-24 | Heraeus Precious Metals Gmbh & Co. Kg | Pumpengehäuse aus einem magnetischen und einem nichtmagnetischen Material |
| DE102013211848A1 (de) | 2013-06-21 | 2014-12-24 | Heraeus Precious Metals Gmbh & Co. Kg | Pumpengehäuse aus mindestens zwei unterschiedlichen versinterbaren Materialien |
| DE102020119914A1 (de) * | 2020-07-28 | 2022-02-03 | KSB SE & Co. KGaA | Gehäuse für strömungsführende Bauteile |
| EP4147746A1 (de) | 2021-09-10 | 2023-03-15 | Greatbatch Ltd. | Keramikverstärkter metallverbundstoff für hermetische körper für implantierbare vorrichtungen |
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2014
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-
2015
- 2015-03-23 US US15/128,921 patent/US10655631B2/en not_active Expired - Fee Related
- 2015-03-23 WO PCT/EP2015/056137 patent/WO2015144643A1/de not_active Ceased
- 2015-03-23 EP EP15711750.8A patent/EP3123032A1/de not_active Withdrawn
-
2020
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Also Published As
| Publication number | Publication date |
|---|---|
| US20170102001A1 (en) | 2017-04-13 |
| US10655631B2 (en) | 2020-05-19 |
| US20200291951A1 (en) | 2020-09-17 |
| DE102014004121A1 (de) | 2015-09-24 |
| WO2015144643A1 (de) | 2015-10-01 |
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