EP3011184B1 - Pump housing made of a magnetic and a non-magnetic material - Google Patents

Description

The invention relates to a pumping device, including i. an impeller; ii. a pump housing which at least partially surrounds an interior area, with an inlet and an outlet, the impeller being provided in the interior area of the pump housing; wherein the wall of the pump housing has at least one first sub-area and at least two further sub-areas in at least one plane (Q) perpendicular to the longitudinal extension of the pump housing; wherein the at least one first sub-area contains at least one non-magnetic material, wherein the further sub-areas each contain at least one ferromagnetic material, each further sub-area in the plane (Q) being adjacent to at least one first sub-area, and wherein the at least one first sub-area and the other sub-areas are connected to one another. The US 2004/0062664 A1 discloses such a pumping device.

Pump devices with rotors or impellers are known. Some pump devices have a pump housing in the form of a tube as a conveying path for a fluid to be conveyed. There is often an impeller in it, which is driven, for example, by a motor located outside the conveyor line via a drive shaft. The pump housing is fastened to the pump device via one or more holding elements. This type of bracket can have various disadvantages. On the one hand, an additional work step is required to attach the bracket. This increases manufacturing costs and is resource inefficient. Furthermore, the connection between the pump housing and the holder is due to the manufacturing process or due to the connection means used, for example screws or rivets, not without tension. This is due to the fact that different materials are usually selected for the brackets and / or connecting means than for the pump housing. As a result of these stresses, the connections between the bracket and the pump housing also deteriorate currently. In addition, it is extremely important, especially for very small pumps, to be manufactured in a space-saving manner. This is especially true for pumps that are to be implanted in a body. A space-saving design is more difficult to implement for pumps with a large number of individual parts than for a pump with a smaller number of individual parts.

In general, it is an object of the present invention to at least partially overcome the disadvantages resulting from the prior art.

Another object is to provide a pumping device, the materials of which are as biocompatible as possible, easy to process, corrosion-resistant and can be permanently connected to one another.

Another object is to provide a pump device which is designed to save space as possible.

Another object is to provide a pump device that can be operated in an energy-saving manner.

A further object is to provide a pump device that is as stress-free as possible, in particular with a housing or pump housing that is as stress-free as possible, and in particular to provide a transition from the pump housing to the remaining part of the pump device that is as stress-free as possible.

It is also an object to provide a pumping device which has the least possible abrasion of the moving parts and their mountings during use.

A further object is to provide a pump housing for a pump device which can be easily and space-savingly integrated into other components, for example a component housing of the pump device.

A further object is to provide a pump housing for a pump device which can be hermetically sealed to a component housing of the pump device.

Another object is to provide a housing or pump housing that is as free as possible from internal and / or external stresses.

A further object is to provide a method in order to be able to manufacture a pump housing in the most cost-effective and time-saving manner.

It is also an object to provide a component housing that is designed to be as space-saving as possible.

Another object is to provide a housing that can be hermetically sealed to other components.

1. i. einen Impeller;
2. ii. ein Pumpengehäuse, das einen Innenbereich zumindest zu einem Teil umgibt, mit einem Einlass und einem Auslass,
   wobei der Impeller im Innenbereich des Pumpengehäuses vorgesehen ist;
   • wobei die Wand des Pumpengehäuses in mindestens einer Ebene senkrecht zur Längsausdehnung des Pumpengehäuses mindestens einen ersten Teilbereich und mindestens zwei weitere Teilbereiche aufweist;
     • wobei der mindestens eine erste Teilbereich zu mindestens 60 Gew.-%, bezogen auf die Gesamtmasse des mindestens einen ersten Teilbereiches, mindestens ein nicht-magnetisches Material beinhaltet,
     • wobei die weiteren Teilbereiche zu mindestens 41 Gew.-%, bezogen auf die Gesamtmasse der weiteren Teilbereiche, mindestens ein ferromagnetisches Material beinhalten,
     • wobei jeder weitere Teilbereich in der Ebene zumindest einem ersten Teilbereich benachbart ist, und
   • wobei der mindestens eine erste Teilbereich und die weiteren Teilbereiche miteinander stoffschlüssig verbunden sind, wobei stoffschlüssig bedeutet, dass die stofflichen Eigenschaften des ersten Teilbereiches fließend in die stofflichen Eigenschaften der weiteren Teilbereiche übergehen.

The subject of the present invention is a pumping device comprising:

1. i. an impeller;
2. ii. a pump housing which at least partially surrounds an interior area, with an inlet and an outlet,
   wherein the impeller is provided in the interior of the pump housing;
   • wherein the wall of the pump housing has at least one first sub-area and at least two further sub-areas in at least one plane perpendicular to the longitudinal extension of the pump housing;
     • wherein the at least one first sub-area contains at least 60% by weight, based on the total mass of the at least one first sub-area, at least one non-magnetic material,
     • where the further sub-areas contain at least 41% by weight, based on the total mass of the further sub-areas, at least one ferromagnetic material,
     • each further sub-area in the plane being adjacent to at least a first sub-area, and
   • wherein the at least one first sub-area and the further sub-areas are cohesively connected to one another, where cohesive means that the material properties of the first sub-area flow into the material properties of the further sub-areas.

The pump device according to the invention is preferably suitable for being introduced into the body of a human or an animal. The pump device according to the invention is also preferably designed to pump body fluids such as blood, serum, plasma, interstitials Promote fluid, saliva, or urine. In particular, it is preferred to introduce the pump device according to the invention for pumping blood into the blood circulation of a human being or an animal. The introduction of the pump device according to the invention can include, for example, implantation in the body, placement on the body or connection to the body.

The pump housing of the pump device according to the invention can have any shape which a person skilled in the art would select for use in a pump device. The pump housing preferably has at least one wall of the pump housing, also referred to below as the pump housing wall. The at least one wall of the pump housing surrounds the interior of the pump housing. The pump housing has at least two ends, at least one inlet being arranged at one end and at least one outlet being arranged at the other end. The interior of the pump housing is completely surrounded by the wall, with the exception of the inlet and outlet of the pump housing. The pump housing can in part extend beyond the inner region of the pump housing. The pump housing preferably ends at the inlet or outlet.

The side of the pump housing facing away from the interior is referred to as the outside of the pump housing. The pump housing preferably has an elongated shape. The shape of the pump housing is defined by a longitudinal extension and at least one cross section. A cross section of the pump housing is always determined in a plane which is perpendicular to the pump housing wall. If the pump housing wall is curved in its longitudinal extent, a cross section perpendicular to the tangent is determined at a point on the pump housing wall. The expansion of the pump housing in the pumping direction is regarded as the longitudinal expansion. The shortest imaginary connection between inlet and outlet within the pump housing always applies. 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 can have one or more wall surfaces. If the pump housing has more than one wall surface, these are connected to one another via corners at which the wall surfaces converge. The wall, and preferably also the wall surfaces, of the pump housing preferably run parallel to the longitudinal extension of the pump housing. Part of the pump housing wall can extend beyond the interior of the pump housing. The pump housing wall preferably extends over the entire inner region of the pump housing.

If the pump housing is tubular, the inlet is at the first end and the outlet is at the opposite end of the pump housing. At least part of the pump housing wall preferably ends at the ends of the pump housing. The part of the pump housing that protrudes beyond the interior into the surroundings is called the pump housing tongue. In a preferred embodiment of the pump device according to the invention, the pump housing has a first opening to the inner region at the first end, the inlet, and a further opening to the inner region at the further end, the outlet. The pump housing is connected to its surroundings in a fluid-conducting manner via the inlet and outlet. The openings at the ends of the pump housing allow a fluid to flow 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 preferably serves as a feed line for the fluid to be conveyed into the inner region of the pump housing and the further opening as a discharge line for the fluid to be conveyed. The pump housing can have further openings, for example in the wall of the pump housing. These further openings can serve for the additional supply of fluid or, on the other hand, for the branched discharge of fluid. If the pump device according to the invention is implanted in a body, for example in order to support the blood circulation and thus relieve the heart, the pump device according to the invention is connected to blood vessels in the body via lines.

The pump housing contains at least one cross section, which is preferably selected from the group consisting of circular, rectangular or polygonal or ellipsoidal. The pump housing preferably has an elongated shape at least in a first section. Furthermore, the pump housing can contain at least one further section, the shape of which deviates from the first section of the pump housing.

The total length of the pump housing is preferably 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 preferably determined along the outer wall of the pump housing in the pumping direction. The pump housing preferably has a length in a range from 1 mm to 10 cm, or preferably in a range from 2 mm to 8 cm, or preferably in a range from 5 mm to 5 cm. The pump housing preferably has an inside diameter in a range from 0.1 to 50 mm, or preferably in a range from 0.5 to 30 mm, or preferably in a range from 1 to 20 mm.

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 from 0.025 to 4 Ra, or preferably in a range from 0.05 to 3 Ra, or preferably in a range from 0.07 to 1 Ra.

• möglichst hohe thermische Beständigkeit;
• möglichst hohe Druckbeständigkeit;
• möglichst hohe Härte;
• möglichst hohe Beständigkeit gegen Säuren und Basen;
• möglichst geringe Rauigkeit;
• möglichst spannungsfreie Verbindbarkeit mit einem Metall-Keramik-Gemisch (Cermet);
• möglichst gute Versinterbarkeit mit einem Metall-Keramik-Gemisch (Cermet);
• möglichst gute Verbindbarkeit mit einem Metall;
• möglichst gute Verschweißbarkeit mit einem Metall,
• möglichst geringe elektrische Leitfähigkeit;
• möglichst geringe magnetische Permeabilität.

The pump housing contains at least a first sub-area and at least one further sub-area. The first and further sub-areas differ in their composition. The at least one first sub-area preferably has at least one, particularly preferably all of the following properties:

• the highest possible thermal resistance;
• the highest possible pressure resistance;
• the highest possible hardness;
• the highest possible resistance to acids and bases;
• the lowest possible roughness;
• Connectivity with a metal-ceramic mixture (cermet) with as little tension as possible;
• The best possible sinterability with a metal-ceramic mixture (cermet);
• the best possible connectivity with a metal;
• the best possible weldability with a metal,
• electrical conductivity as low as possible;
• the lowest possible magnetic permeability.

• möglichst hohe thermische Beständigkeit;
• möglichst hohe Druckbeständigkeit;
• möglichst hohe Härte;
• möglichst hohe Beständigkeit gegen Säuren und Basen;
• möglichst geringe Rauigkeit;
• möglichst gute Versinterbarkeit mit einem keramischen Material oder einem Metall-Keramik-Gemisch (Cermet);
• möglichst hohe elektrische Leitfähigkeit;
• möglichst hohe magnetische Permeabilität.

The at least two further sub-areas preferably have at least one, particularly preferably all of the following properties:

• the highest possible thermal resistance;
• the highest possible pressure resistance;
• the highest possible hardness;
• the highest possible resistance to acids and bases;
• the lowest possible roughness;
• The best possible sinterability with a ceramic material or a metal-ceramic mixture (cermet);
• the highest possible electrical conductivity;
• the highest possible magnetic permeability.

If the at least one first and the further sub-areas are brought together during the manufacture of the pump housing, a pump housing can be obtained which combines one or more of the properties listed for the at least one first sub-area and the at least two further sub-areas. At least a part of the at least one first sub-area is connected to at least a part of the further sub-areas. The connection can be a direct connection between the two sub-areas or an indirect connection. The at least one first sub-area and the at least two further sub-areas are materially connected to one another.

A material connection is present when the material properties of the first sub-area flow into the material properties of the further sub-area. There is no sharp boundary between the two adjoining sub-areas. Rather, there is a transition area in which the properties of the two adjoining sub-areas mix. In the case of an indirect connection, this transition area is also referred to as the third sub-area. In this third sub-area, both the materials of the first sub-area and at least some of the materials of the further sub-area are present next to one another and preferably form a mixture of the materials. The materials of the two sub-areas preferably enter into connections at the atomic or molecular level. Forces act on the atomic or molecular level of the materials of the first and further sub-areas. Such a material connection can usually only be released by destroying the pump housing. Cohesive connections are usually achieved by sintering or by gluing materials.

The at least one first sub-area contains at least 60% by weight, preferably at least 70% by weight, or preferably at least 90% by weight, based on the total mass of the first sub-area, of a non-magnetic material. This is preferably a non-magnetic ceramic or a non-magnetic metal. A non-magnetic material is understood to mean a material that has a magnetic permeability of less than 2 μ, that is to say has no ferromagnetic properties. A ferromagnetic material is understood to be a material that has a magnetic permeability of more than 2 μ.

The at least one first sub-area preferably contains the ceramic in a range from 60 to 100% by weight, or preferably in a range from 70 to 100% by weight, or preferably in a range from 80 to 100% by weight, based on to the total mass of the first sub-area. Furthermore, the at least one first sub-area preferably contains 100% by weight of the ceramic, based on the total mass of the first sub-area.

The ceramic can be any ceramic that a person skilled in the art would select for the pump 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 semimetal oxide or a mixture thereof. The metal of the metal oxide can 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 oxide is preferably selected from the group consisting of aluminum oxide (Al ₂ O ₃ ), magnesium oxide (MgO), zirconium oxide (ZrO ₂ ), yttrium oxide (Y ₂ O ₃ ), aluminum titanate (Al ₂ TiO ₅ ), a piezoceramic such as lead Zirconate (PbZrO ₃ ), lead titanate (PbTiO ₃ ) and lead zirconate titanate (PZT) or a mixture of at least two of these. 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.

The silicate ceramic is preferably selected from the group consisting of a steatite (Mg ₃ [Si ₄ O ₁₀ (OH) ₂ ]), cordierite (Mg, Fe ²⁺ ) ₂ (Al ₂ Si) [Al ₂ Si ₄ O ₁₈ ]) , Mullite (Al ₂ Al _{2 + 2x} Si _2-2X O _10-x with x = oxygen vacancies per unit cell), feldspar (Ba, Ca, Na, K, NH ₄ ) (Al, B, Si) ₄ O ₈ ) or a mixture of at least two of them.

The non-oxide ceramic can be selected from the group consisting of a carbide, a nitride, or a mixture thereof. The carbide can be selected from the group consisting of silicon carbide (SiC), boron carbide (B ₄ C), titanium carbide (TiC), tungsten carbide, cementite (Fe3C). The nitride can be 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 one first sub-area and the at least two further sub-areas can be arranged in different ways within the pump housing. The housing preferably has the shape of a tube with a straight inner wall. On the outer wall of the housing protuberances can protrude, either from at least one which is formed at least one first sub-area or from at least one of the at least two further sub-areas or from a combination of both types of sub-areas. Examples of the arrangement of the various sub-areas in cross-section including the protuberances are shown in Figures 3 and 4th shown.

Each transition from one sub-area to another sub-area can be arranged at right angles with respect to a cross section of the pump housing or at an angle other than 90 °. Furthermore, each transition can also be irregular, i.e. no imaginary straight line can be drawn on the transition in the cross-section. Furthermore, each transition from one sub-area to another sub-area can be arranged at right angles or at an angle other than 90 ° as an alternative or in addition to the one described above in relation to a longitudinal section through a wall of the pump housing. Furthermore, each transition can also be irregular, i.e. no imaginary straight line can be drawn on the transition in the longitudinal section. Furthermore, combinations of the aforementioned configurations of a transition in cross section and in longitudinal section are preferred.

At least one surface of the at least one first partial area preferably points towards the interior area. The at least one first sub-area or the at least two further sub-areas 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. Alternatively, part of the wall thickness can contain the first sub-area and the other part of this wall thickness can contain at least one further sub-area. The at least one first sub-area and the at least two further sub-areas are preferably designed as sections perpendicular or parallel to the longitudinal extent of the pump housing.

In a preferred embodiment of the pump housing of the pump device according to the invention, the at least one first sub-area completely surrounds at least one of the at least two further sub-areas. The at least one first partial area preferably completely surrounds all of the at least two further partial areas. In a preferred embodiment of the pump housing of the pump device according to the invention, at least one surface of the first partial area faces the outside of the pump housing.

In a preferred embodiment of the pump housing of the pump device according to the invention, the at least one first partial area partially surrounds at least one of the at least two further partial areas. The at least one first partial area preferably partially surrounds all of the at least two further partial areas. In a preferred embodiment of the pump housing of the pump device according to the invention, at least one surface of the first sub-area and the further sub-area faces the outside of the pump housing.

In a further preferred embodiment of the pump housing of the pump device according to the invention, at least the at least two further subregions in the form of protuberances point away in different spatial directions from the preferably cylindrical base body of the pump housing.

The pump device according to the invention also includes a rotor in the form of the impeller. The impeller can have any shape that a person skilled in the art would select for this.

The impeller preferably has a diameter in a range from 1 mm to 10 cm, preferably in a range from 3 mm to 5 cm, or preferably in a range from 5 mm to 3 cm. The impeller preferably has a thickness in a range from 0.1 to 50 mm, preferably in a range from 0.5 to 20 mm, or preferably in a range from 1 to 15 mm. 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 from 1 to 10%, or preferably in a range from 1.5 to 8%, or preferably in a range from 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. The impeller particularly preferably has a number of rotor blades in a range from 2 to 20, preferably in a range from 5 to 15, or preferably in a range from 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 referred to as 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 inner region of the pump housing, the axis of rotation of the impeller being provided parallel to the longitudinal extension of the wall of the pipe.

The impeller can be made of any material that a person skilled in the art would select for use in the pumping device according to the invention. The impeller preferably has at least two areas: A first area in the center of the impeller around the axis of rotation. This first area is also called the core area. A second area, also called the rotor area. This second area has at least two rotor blades which are suitable for conveying the fluid to be conveyed.

The impeller contains at least one element, the element having hard magnetic properties. A hard magnetic property means that a material is permanently magnetized as a result of exposure of this material to a magnetic field. The strength of a magnetizing field is chosen depending on the composition of the element. The person skilled in the art is familiar with the considerations and calculations required for this. The induction of the impeller is preferably saturated during magnetization. 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 in such a way that it moves the impeller when it is alternately attracted or repelled by two mutually independent electrical or magnetic fields. The impeller preferably contains at least two elements with hard magnetic properties. Furthermore, the impeller can be controlled in its radial but also axial alignment by at least one optional element. The elements with hard magnetic properties are preferably used to mount the impeller in the pump housing with as little contact as possible without further aids, such as bearings or other fixings in the pump housing. This enables particularly low-friction and particularly low-wear operation.

The at least one element can be implemented, for example, by at least one rotor blade that contains a hard magnetic material. Alternatively, a hard magnetic element can be arranged on at least one rotor blade. The hard magnetic element is preferably provided in the core of the impeller. The at least one hard magnetic element preferably contains at least one magnetizable material, such as iron, cobalt, nickel, chromium dioxide or a mixture of at least two of these. 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. Preferably at least 50%, or preferably at least 70%, or preferably 100% of the rotor blades contain a hard magnetic material. The element preferably contains at least 10% by weight, or preferably at least 20% by weight, or preferably at least 30% by weight, based on the total mass of the element, of a hard magnetic metal. Furthermore, the element preferably contains a cobalt-chromium alloy or a platinum-cobalt alloy, in particular a platinum-cobalt alloy (PtCo23) with a cobalt content of 23% by weight 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 mass of the element.

In its core, the area around the axis of rotation, the impeller can have a different material than in or on the rotor blades. Alternatively, the impeller can include a single material in the core and the rotor blades. The material of the rotor blades can be flexible or inflexible. The material of the core of the impeller or of the rotor blades of the impeller is preferably selected from the group consisting of a polymer, a metal, a ceramic or a combination or mixture of at least two thereof.

The polymer can be selected from the group consisting of a chitosan, a fibrin, a collagen, a caprolactone, a lactide, a glycolide, a dioxanone, a polyurethane, a polyimide, a polyamide, a polyester, a polymethyl methacrylate, a polyacrylate, a Teflon, a copolymer of at least two of these or a mixture of at least two of these.

The metal can be selected from the group consisting of iron (Fe), stainless steel, platinum (Pt), iridium (Ir), niobium (Nb); Molybdenum (Mo), tungsten (W), titanium (Ti), cobalt (Co), chromium (Cr), a cobalt-chromium alloy, tantalum (Ta), vanadium (V) and zirconium (Zr) or a mixture of at least two of these, titanium, niobium, molybdenum, cobalt, chromium, tantalum, zirconium, vanadium and their alloys being particularly preferred.

The ceramic can be selected from the group consisting of aluminum oxide (Al ₂ O ₃ ), zirconium dioxide (ZrO ₂ ), hydroxyapatite, tricalcium phosphate, glass ceramic, aluminum oxide reinforced zirconium oxide (ZTA), aluminum oxide containing zirconium oxide (ZTA - Zirconia Toughened Aluminum - Al ₂ O) ₃ / ZrO ₂ ), yttrium containing zirconium oxide (Y-TZP), aluminum nitride (AIN), titanium nitride (TiN), magnesium oxide (MgO), piezoceramics, barium (Zr, Ti) oxide, barium (Ce, Ti) oxide and sodium Potassium Niobate or a mixture of at least two of these.

Furthermore, the impeller can preferably be coated with a biocompatible material on its outside, in particular on the outside surface of the rotor blades. Suitable biocompatible materials are further described below.

The impeller is preferably arranged in the inner area of the pump housing which is surrounded by the first partial area. 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 impeller in the interior of the pump housing is preferably aligned by magnetic fields from electrical coils on the outside of the pump housing. The coils preferably contain an electrically conductive material. The electrically conductive material of the coils is preferably 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 of these. Furthermore, the electrically conductive material preferably contains copper (Cu). The pump device according to the invention preferably contains 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, the coils and the impeller preferably lying in one plane. They are then arranged on the outside of the pump housing around the impeller.

In a preferred embodiment of the pump device according to the invention, at least part of each further sub-area is surrounded by at least one electrical coil. In a preferred embodiment of the pump device according to the invention, the pump housing contains a tube as at least one base body. The tube is preferably straight. Alternatively, the tube can have at least one bend. The tube is preferably closed except for an inlet such as an outlet. This means that the pipe has no other openings apart from the two openings at the inlet and outlet. Otherwise, the dimensions, materials and configurations preferably correspond to those of the pump housing described above.

In a preferred embodiment of the pump device according to the invention, the non-magnetic material of the at least one first sub-area is selected from the group consisting of a cermet, aluminum oxide (Al ₂ O ₃ ), zirconium dioxide (ZrO ₂ ), a zirconium oxide containing an aluminum oxide (ATZ), an aluminum oxide containing a zirconium oxide (ZTA), a zirconium oxide containing a yttrium (Y-TZP), aluminum nitride (AIN), Magnesium oxide (MgO), a piezoceramic, barium (Zr, Ti) oxide, barium (Ce, Ti) oxide and sodium-potassium niobate, a platinum 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 of these.

In the context of the invention, “cermet” is understood to mean a composite material composed of one or more ceramic materials in at least one metallic matrix or a composite material composed of one or more metallic materials in at least one ceramic matrix. To produce a cermet, for example, a mixture of at least one ceramic powder and at least one metallic powder can be used, which can be mixed with at least one binder and optionally at least one solvent, for example. A selection for the ceramic components and the metallic components of the cermet can be made up of those specified for the first sub-area. A non-magnetic cermet is a composite material of a non-magnetic ceramic and a non-magnetic metal, as mentioned later.

In a preferred embodiment of the pump device according to the invention, the at least one first sub-area contains a non-magnetic metal in a range from 40 to 90% by weight, based on the total mass of the at least one first sub-area.

The non-magnetic metal is also preferably selected from the group consisting of platinum (Pt), iridium (Ir), niobium (Nb), molybdenum (Mo), tungsten (W), titanium (Ti), chromium (Cr), tantalum (Ta), zirconium (Zr), alloys of the aforementioned metals, palladium (Pd), gold (Au), non-magnetic stainless steel (e.g. AISI 304, AISI 316 L) or a mixture of at least two of these. The non-magnetic metal can preferably be selected from the group consisting of titanium (Ti), platinum (Pt), tantalum (Ta), niobium (Nb) or a mixture of at least two thereof.

If the content of the non-metallic metal is below 60% by weight of the first sub-area, the further non-magnetic material can preferably be replaced by a non-magnetic ceramic or a non-magnetic cermet, as described above, to at least 60% by weight. non-magnetic material, based on the total mass of the first sub-area.

In a preferred embodiment of the pump device according to the invention, the ferromagnetic material of the further sub-area is selected from the group consisting of iron (Fe), cobalt (Co), nickel (Ni), chromium dioxide (CrO ₂ ), an iron alloy, an iron-nickel -Alloy, an iron-silicon alloy, an iron-cobalt alloy, a nickel alloy, an aluminum-nickel alloy, a cobalt alloy, a cobalt-platinum alloy, a cobalt-chromium alloy, a neodymium -Iron-boron alloy, a samarium-cobalt alloy or a mixture of at least two of these.

The at least two further subregions of the pump housing preferably contain a metal content in a range from 41 to 90% by weight, preferably in a range from 45 to 85% by weight, or in a range from 60 to 80% by weight, based on to the total mass of the further sub-area.

In a preferred embodiment of the pump device according to the invention, at least one of the at least two further subregions also contains a component selected from a ceramic, a metal or a mixture thereof. The ceramic is preferably selected from the group of ceramics specified for the first sub-area. At least one of the at least two partial areas preferably has the same ceramic as the first partial area. The at least two further sub-areas contain the ceramic preferably in a range from 1 to 49% by weight, or preferably in a range from 2 to 45% by weight, or preferably in a range from 5 to 40% by weight, based on to the total mass of the respective further sub-area. The further metal can contain a metal that does not have ferromagnetic properties. These are preferably the metals that were also specified for the first sub-area. The sum of all constituents of the further sub-area always results in 100% by weight.

According to the invention, the pump housing contains at least one first sub-area and at least two further sub-areas. The pump housing can have several first sub-areas and several further sub-areas. The pump housing preferably has a number of first partial areas in a range from 1 to 10, preferably from 1 to 8, or preferably from 1 to 5. The pump housing preferably has a number of further subregions in a range from 1 to 10, preferably from 2 to 8, or preferably from 2 to 5. The pump housing preferably contains a first sub-area and three further sub-areas. The at least one first and the at least two further partial areas can be of the same size or, alternatively, have different sizes. The at least one first sub-area and the at least two further subregions preferably extend over the entire thickness of the pump housing wall. The at least one first partial area 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 two further partial areas preferably have a width based on the longitudinal extent of the pump housing in a range from 0.5 to 80 mm, preferably in a range from 1 to 60 mm, or preferably in a range from 2 to 20 mm.

In a preferred embodiment of the pump device according to the invention, the pump housing has a volume in a range from 0.1 cm ³ to 10 cm ³ , preferably in a range from 0.2 to 9 cm ³ , or preferably in a range from 0.5 to 5 cm ³ . The dimensions such as length, diameter and wall thickness of the pump housing, as already indicated above, are preferred. The volume of the pump housing is defined by the interior space surrounded by the pump housing. The wall of the pump housing preferably has a thickness in a range from 0.1 to 5 mm, or preferably in a range from 0.3 to 4 mm, or preferably in a range from 0.4 to 3 mm. In the following, either wall thickness or wall thickness is used in this context. On the inner surface of the pump housing, 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 on the pump housing can serve to hold the impeller in its position in the pump housing in at least one direction.

In a preferred embodiment of the pump device according to the invention, the at least one first sub-area contains less than 10% by weight, preferably less than 5% by weight, or preferably less than 3% by weight, based on the total mass of the first sub-area, on magnetic metal. The sum of all components of the first sub-area always results in 100% by weight.

The metal of the first sub-area is preferably selected from the group consisting of platinum (Pt), iron (Fe), stainless steel (AISI 304, AISI 316 L), iridium (Ir), niobium (Nb), molybdenum (Mo), tungsten ( W), titanium (Ti), cobalt (Co), chromium (Cr), a cobalt-chromium alloy, tantalum (Ta), and zirconium (Zr) or a mixture of at least two of these. The metal is preferably selected from the group consisting of titanium, niobium, molybdenum, cobalt, chromium, tantalum and their alloys or a mixture of at least two of these.

In a preferred embodiment of the pump device according to the invention, the third sub-area has a metal content between the metal content of the first sub-area and the metal content of one of the further sub-areas. The third sub-area can be located between the at least one first and the at least one further sub-area due to the manufacturing process of the pump housing. Alternatively, during the manufacturing process, a third sub-area can have been introduced at least between a first and a further sub-area. The third sub-area preferably contains a ceramic and a metal. The ceramic is preferably selected from the ceramics listed for the first sub-area. The metal is preferably selected from the metals listed for the further sub-area. The third sub-range contains the ceramic preferably in a range from 10 to 90% by weight, or preferably in a range from 20 to 80% by weight or preferably in a range from 30 to 70% by weight, based on the total mass of the third sub-area. The third sub-range contains the metal preferably in a range from 10 to 89% by weight, or preferably in a range from 20 to 80% by weight or preferably in a range from 30 to 70% by weight, based on the total mass of the third sub-area. The sum of all components of the third sub-area always results in 100% by weight. The third sub-area preferably has a metal content which results from the mean value of the metal content of the first sub-area and the further sub-area. The third sub-area can serve to reduce or minimize tensions between the different materials of the first and the further sub-area. The connection between the first and the third sub-area is preferably materially bonded. Furthermore, the connection between the second and the third sub-area is also preferably cohesive. The first, the further and the third partial area preferably have the same ceramic or the same ceramics and the same metal or the same metals.

In a preferred embodiment of the pump device according to the invention, the pump device has a component housing which is connected to the pump housing in a hermetically sealed manner. At least part of the pump housing is preferably partially surrounded by a component housing. It is preferred that at least a part of the at least one first partial area of the pump device is connected to the component housing. The connection of the component housing to at least part 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 pump device is preferably hermetically sealed from the environment. The medically implantable one proposed here according to the invention The pump device can in particular be used in the body of a human or animal user, in particular a patient. An implanted pumping device is typically exposed to fluid from body tissue of the body. It is therefore generally important that body fluid neither penetrates into the medically implantable device nor that fluids escape from the medically implantable device. To ensure this, the component housing of the medically implantable device, and thus also the component housing and the pump housing of the pump device according to the invention, should be as completely impermeable as possible, in particular to body fluids.

The pump device according to the invention, in particular connections between component housings and pump housings, are preferably hermetically sealed. The interior of the pumping device is hermetically sealed from the exterior. In the context of the invention, the term “hermetically sealed” means that, when used as intended, no moisture and / or gases can penetrate the hermetically sealed connection within a customary period of 5 years. A physical parameter for determining the tightness of a connection or a component is the leak rate. Leak tightness can be determined by leak tests. Corresponding leak tests are carried out with helium leak testers and / or mass spectrometers and are specified in the standard Mil-STD-883G Method 1014. The maximum permissible helium leak rate is determined depending on the internal volume of the device to be tested. According to the methods specified in MIL-STD-883G, Method 1014, in Section 3.1, and taking into account the volumes and cavities of the devices to be tested that occur in the application of the present invention, the maximum permissible helium leak rate for the pump housing 10 according to the invention is ^{- 7} atm * cm ³ / sec or less. This means that the device to be tested (for example the component housing and / or the pump device according to the invention or the component housing with the connected pump housing) has a helium leak rate of less than 1 × 10 ^-7 atm * cm ³ / sec or less. In a particularly advantageous embodiment, the helium leak rate is less than 1 × 10 ^-8 atm * cm ³ / sec, in particular less than 1 × 10 ^-9 atm * cm ³ / sec. For the purpose of standardization, the mentioned helium leak rates can also be converted into the equivalent standard air leak rate. The definition for the equivalent standard air leak rate and the conversion are given in the ISO 3530 standard.

The pump device according to the invention preferably has, in addition to the impeller, the pump housing with a first and at least two further subregions, preferably a component housing on, in which other components of the pumping device can be located. The further components of the pump device are preferably selected from the group consisting of a battery, a coil, a control unit, a vessel connection unit or a combination of at least two of these.

In a preferred embodiment of the pump device according to the invention, the component housing contains titanium to an extent of at least 30% by weight, preferably at least 50% by weight, or preferably at least 80% by weight, based in each case on the total mass of the component housing. The component housing also preferably contains titanium to an extent of at least 99% by weight, based on the total mass of the component housing. Furthermore, the component housing can preferably contain at least one other metal. The other metal can be selected from the same group as the metal of the further sub-area. The component housing can contain the further metal preferably in a range from 1 to 70% by weight, or preferably in a range from 5 to 50% by weight, or preferably in a range from 10 to 20% by weight. The sum of all components of the component housing always results in 100% by weight. Suitable titanium grades are given in ASTM B265-05: 2011, for example grades 1 to 6.

In a preferred embodiment of the pump device according to the invention, the at least one first partial area of the pump housing has a magnetic permeability of less than 2 μ, preferably less than 1.9 μ, or preferably less than 1.8 μ. The magnetic permeability is determined according to the ASTM 773-01: 2009 standard.

In a preferred embodiment of the pump device according to the invention, the surface of the first partial area facing the inner area of the pump housing has a Vickers hardness of at least 330 HV, preferably at least 350 HV, or preferably at least 370 HV. The entire at least one first partial area preferably has a hardness in the specified ranges. At least the surface of the at least one further sub-area also has a Vickers hardness of at least 330 HV, preferably at least 350 HV, or preferably at least 370 HV. Often 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 partial area 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 area preferably has a hardness which is at least as great as the hardness of the rotor surfaces of the impeller. At least the surface of the at least one first partial area preferably has a hardness that is at least 20 HV, or preferably at least 30 HV, or preferably at least 40 HV higher than the Vickers hardness of the rotor surfaces of the impeller. The surface of the material layer in a range from 0.01 to 2.5 mm, preferably in a range from 0.05 to 1.0 mm, or preferably in a Range from 0.1 to 0.5 mm, understood in each case perpendicular to the surface.

In a preferred embodiment of the pump device according to the invention, 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 pump device is for implantation in a living body, such as that of a human or animal. The biocompatibility is determined and assessed according to the ISO 10993-4: 2002 standard.

As a rule, the surfaces facing the inner region of the pump housing and the outer surfaces of the component housing come into contact with its body fluid after the pump device according to the invention has been implanted in a living body. The biocompatibility of the surfaces that come into contact with body fluid helps ensure that the body is not damaged when it comes into contact with these surfaces.

1. a. Bereitstellen eines ersten Materials;
2. b. Bereitstellen eines weiteren Materials
3. c. Bilden eines Pumpengehäusevorläufers, wobei mindestens ein erster Teilbereich des Pumpengehäuses aus dem ersten Material, und
   wobei mindestens zwei weitere Teilbereiche des Pumpengehäuses aus dem weiteren Material gebildet werdend;
4. d. Behandeln des Pumpengehäusevorläufers bei einer Temperatur von mindestens 300 °C.

This patent specification further discloses a method for manufacturing a pump housing for a pumping device including the steps:

1. a. Providing a first material;
2. b. Providing another material
3. c. Forming a pump housing precursor, wherein at least a first portion of the pump housing is made of the first material, and
   wherein at least two further subregions of the pump housing are formed from the further material;
4. d. Treat the pump housing precursor at a temperature of at least 300 ° C.

Providing the first material in step a. and further material in step b. can be done in any manner that one skilled in the art would select for this purpose.

The formation of the pump housing precursor can take place in any desired manner which the person skilled in the art would select for the purpose of forming a first sub-area and at least two further sub-areas.

In a preferred embodiment of the method, step c. 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.

In a lithographic process, different layers of one or more materials are brought into a mold one after the other. The lithographic process preferably corresponds to a layer-by-layer screen printing process. In the screen printing process, a screen consisting of a material that is as dimensionally stable as possible, such as wood; Metal, preferably steel; a ceramic or a plastic with a selected mesh size on the object to be superimposed or above the object to be superimposed. The printing compound used for applying or overlaying, for example in the form of a paste or a powder, is applied to this screen via a nozzle or from a container and is pressed through the mesh of the screen with a doctor blade. Due to a pattern in the screen, different amounts of printing material used for applying or overlaying can be applied at different points. Thus, due to the geometry and arrangement of the meshes, either a uniform film of the printing compound used for overlaying can be applied or areas with little or no printing compound used for application can alternate with areas with a large amount of printing compound used for application. A uniform film of the printing material used for overlaying is preferably transferred to the surface. The screen meshes can also be partially closed by appropriately applied materials (copying layers, screen printing stencils) so that the printing material is only transferred to the surface to be coated in defined areas with open meshes in order to obtain a defined structure such as a pattern, for example. Furthermore, instead of sieving, thin films with defined openings (stencil) can also be used to transfer the printing material. By repeating this process with one and the same material or with different materials, 3-D structures can be obtained.

Injection molding, also known as the injection molding process, is a molding process for at least one material in order to obtain a shaped solid. Different injection molding processes as well as tools and conditions used in injection molding are known to those skilled in the art known from the prior art. The injection molding can be selected from the group consisting of a multicomponent 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 of these.

Machining can be combined with any other forming process. During machining, a solid body is structured using machining aids such as a drill or a punch. During the structuring, part of the material is removed. In this way, massive bodies can be shaped into hollow bodies, for example. For example, a cavity can be formed in the pump housing precursor by machining if the pump housing precursor is solid. The machining can, however, also be a machining step after the production of a pump housing or housing. In addition to machining, polishing can also take place after the manufacture of the pump housing.

In forming the pump housing precursor in step c. a first material for forming a first partial area is brought into contact with a further material for forming the further partial area. The bringing into contact preferably takes place in the form of injection molding, in which the further material is first injected one after the other into a metal mold and then the first material. The quantitative proportions in the first and further material preferably correspond to the quantitative proportions in the first and in the further sub-area, as they were described above in connection with the first subject, the pump device according to the invention. Furthermore, the first and the further material can contain additives. Preferably, after being brought into contact, the pump housing precursor already has the shape of the pump housing. Preferably the two materials form a continuous shape. The bringing into contact can also include one or more further steps. Thus, a third material, which preferably has a composition like the third sub-area of the previously described pump device according to the invention, can be introduced into the pump housing precursor between the first material and the further material.

Any substance that the person skilled in the art would select as an additive for the first material can be selected as the additive. 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 can be a hydrophobic or a hydrophilic functional group. The functional group can 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 has functional groups preferably in a range from 1 to 100, or preferably in a range from 2 to 50, or preferably in a range from 2 to 30. Preferred dispersants are available under the trade names DISPERBYK® 60 from Byk-Chemie GmbH, DOLAPIX CE 64 from Zschimmer & Schwarz GmbH & Co KG.

The binder is preferably selected from the group consisting of a methyl cellulose, a thermoplastic polymer, a thermosetting polymer and a wax or a mixture of at least two thereof.

The methyl cellulose is preferably selected from the group consisting of hydroxypropylmethyl cellulose (HPMC), hydroxyethylmethyl cellulose (HEMC), ethylmethyl cellulose (EMC) or a mixture thereof. The methyl cellulose preferably contains hydroxypropylmethyl cellulose (HPMC). Furthermore, the methyl cellulose preferably contains hydroxypropylmethyl cellulose in a range from 80 to 100% by weight, or preferably in a range from 90 to 100% by weight, or preferably in a range from 95 to 100% by weight .-%, based on the total mass of methyl cellulose. The methyl cellulose preferably has a proportion of -OCH ₃ groups in a range from 20 to 40% by weight, or preferably in a range from 23 to 37% by weight, or preferably in a range from 25 to 35% by weight , based on the total mass of methyl cellulose. The methyl cellulose also preferably has a proportion of -OC ₃ H ₆ OH groups in a range from 1 to 12% by weight, or preferably in a range from 3 to 9% by weight, or preferably in a range from 4 to 8 % By weight, based on the total mass of methyl cellulose.

The thermoplastic polymer can 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 can 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 of them. Waxes are hydrocarbon compounds that melt above 40 ° C without decomposition. These can also include polyesters, paraffins, polyethylenes or copolymers made from at least two of these.

The first material contains at least one of the aforementioned additives, preferably in a range from 0.1 to 10% by weight, or preferably in a range from 0.2 to 8% by weight, or preferably in a range from 0.5 to 5% by weight, based on the total mass of the first material.

The further material contains at least one of the aforementioned additives, preferably 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 from 0 , 3 to 1 wt .-%, each based on the total weight of the further material.

Treating the pump housing precursor in step d. can be done in any manner that one skilled in the art would select for the purpose of heating the pump housing precursor to at least 300 ° C. Preferably, at least part of the treatment of the pump housing precursor takes place at a temperature in a range from 300 to 2500 ° C, or in a range from 500 to 2000 ° C, or in a range from 700 to 1800 ° C. When the pump housing precursor is treated at an elevated temperature, at least part of the binder preferably escapes. There are different temperature profiles in the treatment in step d. of the pump housing precursor from step c. possible. The treatment of the pump housing precursor can take place, for example, in an oxidative atmosphere, a reductive atmosphere or under a protective atmosphere. An oxidative atmosphere can contain oxygen, for example, such as air or an oxygen / air mixture. A reductive atmosphere can contain hydrogen, for example. A protective atmosphere preferably contains neither oxygen nor hydrogen. Examples of protective atmospheres are nitrogen, helium, argon, krypton or their mixtures. The choice of atmosphere can depend on the materials to be treated. The person skilled in the art is aware of the suitable choice of atmosphere for the materials mentioned. Combinations of different atmospheres for different periods of time can also be selected, preferably one after the other.

The treatment of the pump housing precursor can either take place in one step or preferably in more than one step. The pump housing precursor is preferred in one first sub-step of step d. treated to a temperature in a range from 301 to 600 ° C, or preferably in a range from 350 to 550 ° C, or preferably in a range from 400 to 500 ° C. This first sub-step of treatment step d. can take place over a period in a range from 1 to 180 min, preferably in a range from 10 to 120 min, or preferably in a range from 20 to 100 min. This sub-step can either be carried out by introducing the pump housing precursor from step c. take place in a preheated atmosphere or by slow, gradual or steadily increased heating of the pump housing precursor. The treatment in the first substep of step d is preferred. of the pump housing precursor is carried out in one step to a temperature in a range from 301 to 600 ° C.

In a second sub-step of the treatment from step d., Which preferably follows the first sub-step, the pump housing precursor is preferably heated to a temperature in a range from 800 to 2500 ° C, or preferably in a range from 1000 to 2000 ° C, or preferably heated in a range from 1100 to 1800 ° C. This sub-step can also be carried out either by introducing the pump housing precursor from the first sub-step of step d. take place in a preheated atmosphere or by slow, gradual or steadily increased heating of the pump housing precursor. The treatment in the second substep of step d is preferred. of the pump housing precursor is carried out in one step to a temperature in a range from 800 to 2500 ° C. The treatment of the pump housing precursor in the second substep is carried out over a period of time in a range from 1 to 180 minutes, preferably in a range from 10 to 120 minutes, or preferably in a range from 20 to 100 minutes.

The shape of the pump housing after the manufacturing process is preferably continuous. This means that the pump housing has no further openings or outlets or other recesses besides the outlet and the inlet. The pump housing preferably has a straight outer surface. On the inner surface of the pump housing, 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 on the pump housing can serve to hold the impeller in at least one direction in its position in the pump housing. The wall thickness can either already be thickened during the manufacturing process or after it. Additionally or alternatively, the pump housing can have constrictions.

A pumping device according to the invention can be obtained by inserting an impeller into a pump housing, arranging electromagnets with coils around the pump housing, making a circuit involving a control device and a power source such as a battery. The pump device according to the invention is preferably surrounded by a component housing and the further subregions of the pump housing are materially connected to the component housing. This can be done, for example, by a soldered connection along the point of contact between the pump housing and the component housing.

• wobei die Wand des Gehäuses in mindestens einer Ebene senkrecht zur Längsausdehnung des Gehäuses mindestens einen ersten Teilbereich und mindestens einen weiteren Teilbereich aufweist;
  • wobei der mindestens eine erste Teilbereich zu mindestens 60 Gew.-%, bezogen auf die Gesamtmasse des mindestens einen ersten Teilbereichs, mindestens ein nicht-magnetisches Material beinhaltet,
  • wobei der mindestens eine weitere Teilbereich zu mindestens 41 Gew.-%, bezogen auf die Gesamtmasse des mindestens einen weiteren Teilbereichs, mindestens ein ferromagnetisches Material beinhaltet,
  • wobei der mindestens eine weitere Teilbereich in der Ebene und der mindestens eine erste Teilbereich in der Ebene benachbart ist, und
• wobei der mindestens eine erste Teilbereich und der mindestens eine weitere Teilbereich miteinander stoffschlüssig verbunden sind, wobei stoffschlüssig bedeutet, dass die stofflichen Eigenschaften des ersten Teilbereiches fließend in die stofflichen Eigenschaften der weiteren Teilbereiche übergehen.

The present invention relates to a housing which at least partially surrounds an interior area, with a first end and a second end,

• wherein the wall of the housing has at least one first sub-area and at least one further sub-area in at least one plane perpendicular to the longitudinal extension of the housing;
  • wherein the at least one first sub-area contains at least 60% by weight, based on the total mass of the at least one first sub-area, at least one non-magnetic material,
  • wherein the at least one further sub-area contains at least 41% by weight, based on the total mass of the at least one further sub-area, at least one ferromagnetic material,
  • wherein the at least one further sub-area is adjacent in the plane and the at least one first sub-area is adjacent in the plane, and
• wherein the at least one first sub-area and the at least one further sub-area are cohesively connected to one another, where cohesive means that the material properties of the first sub-area flow into the material properties of the further sub-areas.

The housing corresponds in its shape, its composition and its other configuration to the pump housing that was previously described in connection with the pump device according to the invention.

In a preferred embodiment of the housing, a displaceable element is provided in the housing at least in part of the housing. Further preferred embodiments correspond to the previously described embodiments of the pump device according to the invention.

The displaceable element can 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 which corresponds to the diameter of the pump housing. The material of the slidable element can be any that one skilled in the art would use to do so. The displaceable element preferably contains a metal, a polymer, a ceramic or a mixture thereof. The metal or the polymer can be selected from a metal, a polymer or a ceramic such as was described for the first section for the pump housing. The displaceable element can serve to be displaced in its position in the housing, for example by changing the fluid flow in the housing. If the position of the movable element is changed, a current flow can be triggered in a coil and recorded by means of a current flow measurement.

Measurement methods

1. 1. Determination of hardness according to Vickers (HV):
   The test forces and materials were determined in accordance with the DIN EN ISO 6507-March 2006 standard. The following test forces and exposure times were used: 1 kg, 15 seconds. The test temperature was 23 ° C ± 1 ° C
2. 2. Determination of the magnetic permeability: The magnetic permeability was determined according to the standard ASTM A773 / A773-01 (2009)
3. 3. Determination of biocompatibility:
   The biocompatibility will be determined according to the standard 10993-4: 2002.
4. 4. Determination of the hermetic connection:
   Leak tests will be performed with helium leak testers and / or mass spectrometers. A standard measurement method is specified in the Mil-STD-883G Method 1014 standard. The maximum permissible helium leak rate is determined depending on the internal volume of the device to be tested. According to the methods specified in MIL-STD-883G, Method 1014, in Section 3.1, and taking into account the volumes and cavities of the devices to be tested that occur in the application of the present invention, the maximum permissible helium leak rate for the pump housing 10 according to the invention is ^{- 7} atm * cm ³ / sec or less. This means that the device to be tested (for example the component housing and / or the pump 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 or less. For comparison purposes, the mentioned helium leak rates can also be converted into the equivalent standard air leak rate. The definition for the equivalent standard air leak rate and the conversion are given in the ISO 3530 standard.
5. 5. Determination of the roughness: DIN EN ISO 4288. Further parameter details: Maximum stylus tip radius = 2 µm; Measuring distance = 1.25 mm; Cutoff wavelength = 250 µm.

Examples

• Example 1 for the first material:
  The first material contains 45% by weight of platinum powder from Heraeus Precious Metals GmbH & Co.KG with a grain size of D ₅₀ = 50 μm and 45% by weight of aluminum oxide (Al ₂ O ₃ ) from CeramTech GmbH with a grain size of D. ₉₀ = 2 µm and 10% by weight of a METAWAX P-50 binder available from Zschimmer & Schwarz GmbH & Co. KG.
• Example 2 for further material:
  The further material contains a mixture of 45% by weight of a Pt-Co-23 material from Heraeus Holding GmbH and 45% by weight of aluminum oxide (Al ₂ O ₃ ) available from CeramTech GmbH, and 10% by weight of the METAWAX P-50 binder available from Zschimmer & Schwarz GmbH & Co.KG.
• Example 3 for the first sub-area:
  The first material 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.
• Example 4 for another sub-area:
  The further material contains a mixture of 50% by weight of a Pt-Co-23 material from Heraeus Holding GmbH and 50% by weight of aluminum oxide (Al ₂ O ₃ ) available from CeramTech GmbH.

If not specified here, the grain sizes of the materials can be taken from the product data sheet, which is available from the raw material supplier and is often included with a delivery.

According to the method according to the invention for the production of a pump housing, the first material from Example 1 is initially provided in a container. The further material from Example 2 is also provided in a container. In alternating order, the powders of the further material and of the first material can be placed in the mold, as shown in FIG. 5, and pressed together with a punch. In this way, 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. in order to to obtain a pump housing with at least a first sub-area with the composition according to example 3 and at least one further sub-area with the composition from example 4.

characters

Figur 1

eine schematische Darstellung einer erfindungsgemäßen Pumpvorrichtung;

Figur 2

ein Schema eines Verfahrens zur Herstellung eines erfindungsgemäßen Pumpengehäuses;

Figur 3a-b

eine schematische Darstellung eines erfindungsgemäßen Pumpengehäuses mit einem ersten und einem weiteren Teilbereich direkt benachbart zueinander angeordnet;

Figur 4a-b

eine schematische Darstellung eines erfindungsgemäßen Pumpengehäuses mit einem ersten und einem weiteren Teilbereich getrennt durch einen dritten Teilbereich angeordnet;

gezeigt.In the following, in

Figure 1

a schematic representation of a pumping device according to the invention;

Figure 2

a scheme of a method for producing a pump housing according to the invention;

Figure 3a-b

a schematic representation of a pump housing according to the invention with a first and a further sub-area arranged directly adjacent to one another;

Figure 4a-b

a schematic representation of a pump housing according to the invention with a first and a further sub-area separated by a third sub-area;

shown.

In Figure 1 A pump device 10 is shown schematically, which has a pump housing 20 in the form of a tube, as well as 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 designed to be biocompatible has a wall 21 which surrounds an interior region 50. The surface of the pump housing 20 facing the inner region 50 is referred to as the facing surface 102. The facing surface 102 comes into contact with the fluid and is therefore preferably designed to be biocompatible, in particular for an implantable pump device 10. At least one impeller 80 is located in the inner area 50 of the pump housing 20, in this case two impellers 80 are located in the pump housing 20. The pump housing 20 has a first partial area 26 in the center of the wall 21. At the first end 22, which at the same time defines the inlet 22 through the opening 23, the wall 21 or the pump housing 20 has a first further partial area 28. On the opposite side of the pump housing 20 is the further end 24, in the form of the outlet 24, including the further opening 25. By means of the impeller 80, a fluid can be pumped in the pumping direction 240 from the inlet 22 to the outlet 24. Further components, such as a battery 120 and a control unit 130, are located between component housing 40 and the pump housing. Furthermore, two coils 32 and 32 ′ are located in component housing 40 , 28 'be arranged or attached to a are located elsewhere in the component housing 40. The further subareas 28, 28 ′ are designed as protuberances from the otherwise tubular pump housing 20.

In Figure 2 the sequence of the method for producing a pump housing is shown schematically. In step a. or a) 200 a first material 60 is provided. The first material 60 is, for example, a mixture of at least two powders. The first material contains the composition from Example 1

The further material 70 is provided in the form of a mixture Example 2. The container can be a metal container with a sieve outlet. The powder grains preferably have a round to oval dimension. The particle size specification D ₅₀ means that no more than 50% of the particles are larger than the specified diameter. The particle size specification D ₉₀ means that no more than 90% of the particles are larger than the specified diameter. The grain size can be determined using various methods. The grain size is preferably determined with the aid of laser diffraction, light microscopy, optical single particle counting or a combination of at least two of these. It is also preferred to determine the grain size and the grain size distribution on the basis of optical individual evaluation of recordings by means of transmission electron microscopy (TEM).

In a step c or c) 220, a pump housing precursor 90 is formed from the first material 60 and the further material 70.

Steps c. or c) 200 are two alternatives which can be used in the formation of the pump housing precursor 90. In the first alternative of step c. a further sub-area 28 is initially formed by the further material 70. Here, the further material 70 is printed with the aid of a Teflon squeegee with the dimensions 10 mm * 4 mm * 2 mm and a squeegee hardness of 50 shore in a first form made of an aluminum oxide ceramic. The first form is open on one side. The first material 60 is then pressed into a further shape, as described for the further material. The other shape is also open on one side. With a stamp made of stainless steel, the first and the further material 70 are pressed together under a pressure of a weight of 10 kg. Two blanks are produced, which are treated at a temperature of 400 ° C. in a heating furnace from Heraeus Holding GmbH for 10 hours.

The two blanks are then joined together to form a pump housing precursor 90 on the open sides of the mold. The pump housing precursor is treated in air at a temperature of 400 ° C. This treatment takes place in a heating furnace from Heraeus Holding GmbH for a period of 160 minutes. Directly at the end of this treatment step, the pump housing precursor 90 is treated at a temperature of 1700 ° C. in the same furnace for 180 minutes, the subregions 26, 28 sintering together and a pump housing being produced. The result is a pump housing in the form of a round tube from at least one first sub-area and protuberances from at least two further sub-areas. The inside diameter of the pump housing is 9 mm.

In Figure 3a a cross-section (in a plane Q) through a pump housing 20 produced as above is shown. The core of the tubular pump housing 20 is formed by a first sub-area 26 into which many more sub-areas 28 and 28 'protrude. The further subregions 28 and 28 'form protuberances from the pump housing 20 in all four directions. The surface of the inner region 50, consequently the surface 102 facing the inner region 50, is formed exclusively by a first partial region 26 in this embodiment.

In Figure 3b a cross section (in the plane Q) through a pump housing 20 according to the invention is also shown. The arrangement of the further subregions 28 and 28 'are identical to those from FIG Figure 3a and project outwards in all directions from the tubular base body of the pump housing. In contrast to the further sub-areas 28, 28 ', the further sub-areas 28, 28' in the embodiment are off Figure 3b surrounded by the first partial area 26. As a result, the entire outer surface of the pump housing 20 contains the first partial area 26.

In Figure 4a a pump housing 20 with protuberances from the tubular base body of the pump housing 20 is shown. Here the further subregions 28 and 28 'all protrude through the wall thickness of the pump housing 20 to the inner region 50. The inner region 50 consequently has on its facing surface 102 both parts of the first subregion 26 and parts of further subregions 28, 28'. The first sub-area 26 protrudes at the inlet 22 and the outlet 24 beyond the further sub-areas 28, 28 '.

The embodiment from Figure 4b has the same shape and arrangement of the first 26 and further subregions 28, 28 ', with the difference that the further subregions 28 and 28' alternate in the circumference of the pump housing 20. This has the consequence that at the first opening 23 at the inlet 22 and at the further opening 25 at the outlet 24, both types of sub-areas, i.e. both at least one first sub-area 26 and at least the two sub-areas 28, 28 'end. <b> List of reference symbols </b> 10 Pumping device 240 Pumping direction 20th Housing, pump housing Q Cross-sectional plane 21 wall 22nd first end / inlet 23 first opening 24 further end / outlet 25th further opening 26, 26 ' first sub-area 28, 28 ' further sub-area 32, 32 ' Kitchen sink 40 Component housing 50 Indoor 60 first material 70 further material 80 Impeller 90 Forerunner / Pump Housing Forerunner 100 Exterior surface 102 facing surface 110 electrical component 120 battery 130 Control unit 200 Step a. / Step a) 210 Step b. / Step b) 220 Step c. / Step c) 230 Step d. / Step d)

Claims (11)

1. A pumping device (10), comprising:

   i. an impeller (80);

   ii. a pump housing (20) including a wall (21) surrounding an interior region (50) with an inlet (22) and an outlet (24);
   wherein the impeller (80) is provided in the inner area (50) of the pump housing (20),
   wherein the wall (21) of the pump housing (20) has, in at least one plane (Q) perpendicular to the longitudinal extent of the pump housing (20), at least one first partial region (26, 26') and at least two further partial regions (28, 28'); wh

   erein the at least one first partial region (26, 26') comprises at least 60% by weight, based on the total mass of the at least one first partial region (26, 26), of at least one non-magnetic material,

   wherein the further subregions (28, 28') comprise at least 41 wt.%, based on the total mass of the further subregions (28, 28'), of at least one ferromagnetic material,

   each further portion (28, 28') being adjacent in the plane (Q) to at least one first portion (26, 26'), and

   wherein the at least one first partial region (26, 26') and the further partial regions (28, 28') are joined to one another by cohesive bonding,

   whereby cohesive bonding means that the material properties of the first sub-area merge smoothly into the material properties of the further sub-areas.
2. The pumping device (10) according to claim 1, wherein at least a portion of each further sub-region (28, 28') is surrounded by at least one respective electrical coil (32, 32').
3. The pumping device (10) of claim 1 or 2, wherein the non-magnetic material of the at least one first portion (26, 26') is selected from the group consisting of a cermet, alumina (Al₂O₃), zirconia (ZrO₂), an alumina-containing zirconia (ATZ), a zirconia-containing alumina (ZTA), an yttria-containing zirconia (Y-TZP), aluminium nitride (AIN), magnesium oxide (MgO), a piezoceramic, barium (Zr, Ti) oxide, barium (Ce, Ti) oxide and sodium potassium niobate, a platinum 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 of these.
4. The pumping device (10) according to any one of the preceding claims, wherein the at least one first portion (26, 26') comprises a non-magnetic metal in a range of 40 to 90% by weight based on the total mass of the at least one first portion (26, 26').
5. The pumping device (10) according to any one of the preceding claims, wherein the ferromagnetic material of the further portion (28, 28') is selected from the group consisting of iron (Fe), cobalt (Co), nickel (Ni), chromium dioxide (CrO₂), ferrite (Fe₂O₃) an iron alloy, an iron-nickel alloy, an iron-silicon alloy, an iron-cobalt alloy, a nickel alloy, an aluminium-nickel alloy, a cobalt alloy, a cobalt-platinum alloy, a cobalt-chromium alloy, a neodymium-iron-boron alloy, a samarium-cobalt alloy or a mixture of at least two of these.
6. The pumping device (10) according to any one of the preceding claims, wherein at least one of the at least two further sub-regions (28, 28') further comprises a component selected from a ceramic, or a metal, or a mixture thereof.
7. The pumping device (10) according to any one of the preceding claims, wherein the at least one first portion (26, 26') comprises less than 10% by weight, based on the total mass of the first portion (26, 26'), of magnetic metal.
8. The pump device (10) according to any one of the preceding claims, wherein the pump housing (20) has a volume in a range from 0.1 cm³ to 10 cm³.
9. The pump device (10) according to any one of the preceding claims, wherein the pump device comprises a component housing (40) tightly connected to the pump housing (20).
10. The pumping device (10) according to claim 9, wherein the component housing (40) comprises at least 30% by weight, based on the total mass of the component housing (40), of titanium.
11. The pump device (10) according to any one of the preceding claims, wherein at least the outer surface (100) of the component housing (40) and the surface (102) facing the inner region (50) of the pump housing (20) are biocompatible.

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