Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
  • A61M60/10—Location thereof with respect to the patient's body
  • A61M60/122—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body
  • A61M60/126—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel
  • A61M60/135—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel inside a blood vessel, e.g. using grafting
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
  • A61M60/10—Location thereof with respect to the patient's body
  • A61M60/122—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body
  • A61M60/126—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel
  • A61M60/13—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel by means of a catheter allowing explantation, e.g. catheter pumps temporarily introduced via the vascular system
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
  • A61M60/20—Type thereof
  • A61M60/205—Non-positive displacement blood pumps
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
  • A61M60/20—Type thereof
  • A61M60/205—Non-positive displacement blood pumps
  • A61M60/216—Non-positive displacement blood pumps including a rotating member acting on the blood, e.g. impeller
  • A61M60/237—Non-positive displacement blood pumps including a rotating member acting on the blood, e.g. impeller the blood flow through the rotating member having mainly axial components, e.g. axial flow pumps
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
  • A61M60/20—Type thereof
  • A61M60/247—Positive displacement blood pumps
  • A61M60/253—Positive displacement blood pumps including a displacement member directly acting on the blood
  • A61M60/268—Positive displacement blood pumps including a displacement member directly acting on the blood the displacement member being flexible, e.g. membranes, diaphragms or bladders
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
  • A61M60/40—Details relating to driving
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
  • A61M60/40—Details relating to driving
  • A61M60/403—Details relating to driving for non-positive displacement blood pumps
  • A61M60/408—Details relating to driving for non-positive displacement blood pumps the force acting on the blood contacting member being mechanical, e.g. transmitted by a shaft or cable
  • A61M60/411—Details relating to driving for non-positive displacement blood pumps the force acting on the blood contacting member being mechanical, e.g. transmitted by a shaft or cable generated by an electromotor
  • A61M60/414—Details relating to driving for non-positive displacement blood pumps the force acting on the blood contacting member being mechanical, e.g. transmitted by a shaft or cable generated by an electromotor transmitted by a rotating cable, e.g. for blood pumps mounted on a catheter
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
  • A61M60/50—Details relating to control
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
  • A61M60/80—Constructional details other than related to driving
  • A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
  • A61M60/804—Impellers
  • A61M60/806—Vanes or blades
  • A61M60/808—Vanes or blades specially adapted for deformable impellers, e.g. expandable impellers
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
  • A61M60/80—Constructional details other than related to driving
  • A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
  • A61M60/81—Pump housings
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
  • A61M60/80—Constructional details other than related to driving
  • A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
  • A61M60/818—Bearings
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
  • A61M60/80—Constructional details other than related to driving
  • A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
  • A61M60/818—Bearings
  • A61M60/825—Contact bearings, e.g. ball-and-cup or pivot bearings
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
  • A61M60/80—Constructional details other than related to driving
  • A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
  • A61M60/827—Sealings between moving parts
  • A61M60/829—Sealings between moving parts having a purge fluid supply
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
  • A61M60/80—Constructional details other than related to driving
  • A61M60/855—Constructional details other than related to driving of implantable pumps or pumping devices
  • A61M60/857—Implantable blood tubes
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
  • A61M60/80—Constructional details other than related to driving
  • A61M60/855—Constructional details other than related to driving of implantable pumps or pumping devices
  • A61M60/89—Valves
  • A61M60/894—Passive valves, i.e. valves actuated by the blood
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M2205/00—General characteristics of the apparatus
  • A61M2205/02—General characteristics of the apparatus characterised by a particular materials
  • A61M2205/0216—Materials providing elastic properties, e.g. for facilitating deformation and avoid breaking
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M2205/00—General characteristics of the apparatus
  • A61M2205/02—General characteristics of the apparatus characterised by a particular materials
  • A61M2205/0238—General characteristics of the apparatus characterised by a particular materials the material being a coating or protective layer
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M2205/00—General characteristics of the apparatus
  • A61M2205/02—General characteristics of the apparatus characterised by a particular materials
  • A61M2205/0266—Shape memory materials

Definitions

• the application relates to a pump, in particular a blood pump, according to the preamble of claim 1.
• the prior art discloses blood pumps having a proximal and a distal end and a catheter arranged therebetween, in which a flexible drive shaft is guided in an interior space of the catheter.
• Such blood pumps typically include at their distal end a pumphead comprising a foldable housing and a foldable delivery member, the delivery member being connected to a distal portion of the drive shaft.
• the foldable housing may have an elastic covering.
• Such pump heads can be routed to hard to reach places. For example, such a pumphead may be inserted through the femoral artery via the aortic arch into an area of the aortic valve of a patient to deliver blood from the left ventricle of the heart into the aorta.
• the drive shaft is driven on
• a blood pump proximal end of the blood pump by a motor, which is typically located outside the patient's body.
• a motor typically located outside the patient's body.
• Such a blood pump is described, for example, in document EP 2 868 331 A2.
• the object of the application is to propose an improved pump, in particular an improved blood pump, which is more efficient in operation.
• the proposed pump in particular blood pump, comprises a drive shaft extending in an axial direction, a conveying element which is connected in a distal region of the drive shaft with this and a housing which surrounds the conveying element.
• the conveying element and the housing are designed such that they unfold automatically after forced compression.
• the housing has an inlet area with at least one inlet opening, a liquid-tight area surrounding a region of the conveying element, and an outlet area with at least one opening for the outlet of a pumping medium.
• the conveying element is arranged such that it projects into the outlet region.
• the conveying element is arranged in an expanded state of the housing and of the conveying element in such a way that it projects into the outlet area.
• the outlet region surrounds a region of the conveying element arranged in the conveying direction. Due to the at least one opening of the outlet region, the conveying element is not completely enclosed in the outlet region in a liquid-tight manner.
• the outlet region can therefore surround a region of the conveying element that is located at one end of the conveying element, which points in the conveying direction.
• the liquid-tight region typically adjoins a downstream end of the inlet region and the outlet region typically joins a downstream end of the liquid-tight region.
• the inlet cover, the liquid-tight region and the outlet region have a substantially annular cross-section at least in regions. It is envisaged that the pumping during operation of the pump flows through the inlet area into the housing and leaves the housing via the outlet area.
• the housing typically has lateral openings in addition to axial openings in the outlet area, so that a pumped medium conveyed in the outlet area can flow out of the housing in the radial direction or perpendicular to the drive shaft axis or at least one radial velocity component when flowing out.
• the pump power can be drastically increased compared to known Bfutpumpen the type described above.
• a volume of fluid delivered in a given time interval can be increased by up to 50% in this way for the same engine power.
• the conveying element protrudes partially out of the liquid-tight area.
• the delivery element then partially projects into the outlet region.
• the outlet region overlaps with at least 5%, preferably at least 10%, particularly preferably at least 25%, of an axial extent of the conveying element.
• the outlet region overlaps with at most 75%, preferably at most 65%, particularly preferably at most 50%, of an axial extent of the conveying element.
• the housing comprises a grid, in particular in the outlet region.
• the grid may comprise a shape memory material or a suitable memory alloy so that the grid is reliably expandable and compressible.
• the grid may comprise, for example, nitinol, a plastic, an iron alloy or a copper alloy. It can be provided that the housing comprises a grid in the inlet region and / or in the liquid-tight region and / or in the outlet region.
• the housing has an elastic covering.
• the elastic see covering can be arranged for example on an inner side and / or on an outside of an optionally existing grid.
• a fabric is suitable to close grid openings. This may be, for example, a polyurethane fabric. However, it is also possible, for example, to use polyethylene, polypropylene, silicone or parylene.
• the liquid-tight region can be formed at least partially by the elastic covering.
• the outlet area and the inlet area are formed by the grid with its grid openings, while between the outlet area and the inlet area the liquid-tight area is formed by a covering of the grid with the elastic covering.
• the housing in an expanded state in the outlet region, has a conical section which tapers in the conveying direction. It can also be provided that, in an expanded state in the inlet region, the housing has a conical section widening in the conveying direction.
• the housing may also have, in an expanded state in the outlet region, a substantially tubular portion which is connected to the conical portion at a downstream end.
• the tubular portion of the outlet portion may transition to a tubular portion of the liquid-tight portion at an opposite end to the conveying direction.
• the grid has larger grid openings in the outlet area than in the liquid-tight area.
• the grid has larger grid openings in the inlet area than in the liquid-tight area.
• a region of the outlet region is surrounded by an outflow element.
• a portion of the outlet portion is surrounded by a Abströmprocess extending from the pump housing in the conveying direction.
• This Abströmfelrm may substantially have a shape corresponding to a lateral surface of a truncated cone.
• Abströmles attached to the housing in particular in the liquid-tight area.
• a widening end of the outflow shield can be aligned in the conveying direction so that the outflow shield partially or completely surrounds the outlet region.
• Outflow hose is surrounded, which extends from the pump housing in the conveying direction.
• the outflow spray is designed so flexible that it forms a check valve. Similar to the outflow shield, such an outflow hose can contribute to a further optimization of the flow conditions and to an improvement in the pumping power. It is for example an outflow hose, as described in EP 2 345 440 Bl, possible.
• the inlet area does not overlap with an axial extent of the conveyor element.
• the conveying element may be arranged such that it does not protrude into the inlet area.
• the drive shaft is connected at a proximal end of the drive shaft to a motor for driving the drive shaft.
• the shaft may be a flexible shaft that is guided in a catheter.
• the pump may be configured to pump blood from a ventricle into a patient's blood vessel, the drive shaft being configured in a proximal region for connection to a motor external to a body of the patient.
• the engine can, for example, for attachment be arranged on a thigh of a patient.
• the catheter and the drive shaft may have a sufficient length of at least 50 cm, preferably at least 90 cm.
• a maximum length of the flexible drive shaft may be 200 cm, preferably 150 cm.
• the grid may be formed in a region of the housing as a diamond grid with substantially diamond-shaped grid openings.
• the grid has lattice struts, wherein a number of the lattice struts along a circumference of the diamond grid m-2 "with natural numbers m and n, preferably 32 or 40, is, where m is greater than 2, preferably greater than 3,
• the housing in the outlet region along a circumference m, preferably 4 or 5 has lattice struts.
• Such a design allows a particularly stable reduction of the lattice struts, for example in the direction of a distal or in the direction of a proximal end of the housing.
• a particularly stable enlargement of the grid openings can be achieved in this way. It can be provided that all grid struts along a circumference of the housing at a certain axial position in the form of the letter Y are brought together in pairs. Such merging may occur repeatedly at one or more other axial positions of the housing.
• the number of struts and openings may also be gradually increased from 8 (6), 16 (12), 32 (24), ..., starting from 4 (3) struts and openings along the circumference of the housing, n a number of the steps, and m a number of the struts and openings along a circumference of the housing at an axial position at which the merging begins.
• the application also relates to a blood pump having a drive shaft extending in an axial direction, a delivery element connected to a drive shaft in a distal region thereof, and a housing, which surrounds the conveyor element comprises.
• the conveying element and the housing are designed such that they unfold automatically after forced compression.
• the housing has a grid, an inlet region with at least one inlet opening, a liquid-tight region which surrounds a region of the conveying element, and an outlet region with at least one opening for the outlet of a pumping medium.
• the grid has grid openings and grid bars, wherein a number of the grid bars along a circumference of the grid at a first axial position of the grid m and wherein the grid is designed such that the number of grid bars along a circumference of the grid in an axial Direction is increased with n steps on m-2 n lattice struts at a second axial position of the lattice, where m and n are natural numbers and m is greater than 2, preferably greater than 3.
• m can be 3, 4 or 5.
• m may be 6, 8 or 10, for example.
• the number of grid bars along the perimeter of the grid at the second axial position of the grid is 32 or 40.
• FIG. 1 is a schematic representation of a pump assembly
• Fig. 2 is a schematic representation of a pump head, Ftgn. 3 (a), (b) two further schematic representations of the pump head,
• Fig. 5 is a schematic representation of an engine
• Fig. 6 is a schematic representation of another engine. 1 schematically shows a pump arrangement 1.
• the pump arrangement 1 comprises a catheter 2, in which a flexible drive shaft 3 is guided.
• the catheter 2 is connected to a pump head 4.
• This pump head 4 comprises a housing 5 and a delivery element 6 arranged in the housing 5, which can be driven via the drive shaft 3 with a motor 7 connected to the proximal end of the drive shaft 3.
• the pump head 4 and the catheter 2 and the drive shaft 3 are introduced via a lock 8 in the femoral artery 9, such that the pump head 4 in the region of the left ventricle 10 in the region of the aortic valve
• a direction of delivery of the pump assembly 1 corresponds to the direction from a distal end 13 of the pump assembly 1 to a proximal end 14 of the
• the pump arrangement 1 can also be set up for conveying blood in a direction from the proximal end 14 to the distal end 13 of the pump arrangement 1, which can be used, for example, for a right heart.
• the pump head 4 is shown schematically in Fig. 2. Recurring features are given the same reference numbers in this and in the following figures.
• the pump head 4 comprises the conveying element
• the conveying element 6 is designed in the present example as a pump rotor with two flexible segments in the form of rotor blades.
• the drive shaft 3 is shown, which is mounted on a distal region 15 of the pump head 4.
• a so-called pig-tail 17 is provided, which is made of an elastically deformable material.
• a cylindrical member 18 is rigidly connected.
• the conveyor element 6 is attached.
• Both the conveying element 6 and the housing 5 are designed to be deployable so that they unfold automatically after forced compression.
• the conveying element 6 is made of a plastic.
• the housing 5 is made of shape memory material. nitinol. Characterized in that both the conveying element 6 and the housing 5 are designed to be deployable, the entire pump head 4 is deployable.
• the housing 5 is designed as a diamond lattice 19 and has in a liquid-tight region 20 an elastic covering 21 made of polyurethane.
• the elastic covering 21 covers an inner side and an outer side of the Rautengitter 19 such that formed by the grid 19 diamond-shaped grid openings are sealed liquid-tight in the liquid-tight region 20 by the elastic covering 21.
• the housing 5 has an inlet region 22, which is not covered by the elastic covering 21.
• the diamond-shaped grid openings form inlet openings, one of which is provided by the reference numeral 23 in FIG. 2 by way of example.
• the housing 5 has an outlet region 24, which is likewise not covered by the elastic covering 21. In the outlet region 24, the diamond-shaped grid openings form outlet openings, one of which is shown by way of example and provided with the reference numeral 25.
• the drive shaft 3 is driven by the motor 7, so that the conveying element 6 connected to the drive shaft 3 rotates about an axis of the drive shaft 3.
• the conveying element 6 connected to the drive shaft 3 rotates about an axis of the drive shaft 3.
• blood is conveyed into the housing 5 through the inlet openings of the inlet area 22 and then exits the housing 5 through the outlet openings of the outlet area 24. In this way, blood is conveyed in a conveying direction 26 by the pump arrangement 1.
• the elastic covering 21 does not completely surround an axial extension of the conveying element 6. Instead, the conveying element 6 partially protrudes into the outlet region 24, so that at least the outlet opening is arranged at the reference mark 25 laterally, ie in the radial direction, next to the conveying element 6.
• the elastic covering 21 is embodied at its distal end in such a way that the conveying element 6 does not or not substantially project into the inlet region 22 and is thus not laterally surrounded by inlet openings.
• the elastic covering 21 and the conveying element 6 are configured and arranged relative to one another such that approximately one third of the axial extent of the conveying element 6 is not surrounded by the elastic covering 21 which forms the liquid-tight region 20. The same proportion of the axial extent of the conveying element 6 is surrounded by the outlet region 24 in the example shown.
• the pump head 4 comprises a discharge element.
• This may be embodied as a discharge screen 27, as shown in Fig. 3 (a), or as a discharge hose 27 'as shown in Fig. 3 (b).
• the Abströmtress 27 shown in Fig. 3 (a) is attached to the housing 5 in the liquid-tight region 20 of the housing 5.
• the Abströmnes 27 has the shape of a jacket of a truncated cone and extends in the conveying direction 26, that this is widened in the conveying direction 26.
• the discharge element 27 surrounds the delivery element 6 and the outlet region 24. It can also be provided in another embodiment that the outlet region 24 is partially surrounded by the Abströmtran 27.
• the pump head 4 in Fig. 3 (b) differs from the pump head 4 shown in Fig. 3 (a) only in that instead of the Abströmles 27, a discharge hose 27 'is provided.
• This is attached to the housing 5 in the liquid-tight region 20 and extends from there in the conveying direction 26.
• the outflow hose 27 ' is made of polyurethane and has openings 28, 28', 28 "in a region located in the conveying direction 26.
• the outlet tube 27 ' is flexible and closes itself automatically when a blood flow occurs opposite to the conveying direction 26, in that the outlet tube 27' to the catheter 2 and / or to the Housing 5 is pressed.
• FIG. 4 schematically shows the diamond lattice 19 of the housing 5.
• the liquid-tight region 20 with the elastic covering 21 and the inlet region 22 and the outlet region 24 are represented. Regions of the inlet region 22 and the outlet region 24 have a conical shape, whereas the liquid-tight region 20 is substantially tubular.
• the grid 19 has lattice struts, one of which is identified by the reference numeral 45 by way of example.
• the lattice struts 45 extend in such a way that the substantially diamond-shaped lattice openings are greater in both the inlet area 22 and the outlet area 24 than in the liquid-tight area
• the lattice struts 45 form a comparatively close-meshed lattice 19.
• the grid 19 has thirty-six struts or, if the circumference is viewed at an axial position of the housing 5 with nodes, sixteen nodes.
• the housing 5 has eight lattice struts 45 in these areas.
• the outlet region 24 there is a further reduction of the number of lattice struts 45 in the above-mentioned manner, so that the housing 5 has only four lattice struts 45 along a circumference in a region further in the conveying direction 26.
• a grid 19 with larger grid openings than in the liquid-tight area 20 is formed in the inlet area 22 and in the outlet area 24.
• the grid struts 45 form in the conical regions of the exit area 24 and the inlet portion 22 has a spiral-shaped structure, which leads to a reliable deployment of the pump head 4 when the pump head 4 is pushed out of a cannula.
• Fig. 5 shows a schematic view of the motor 7.
• the motor 7 is connected in the region of a stub shaft 29 with the catheter 2, which is glued into the stub shaft 29.
• the flexible drive shaft 3 is guided.
• the motor 7 also has a rotor 30 which comprises a rotor magnet 31.
• the flexible drive shaft 3 is connected to the rotor 30 in such a way that a torque is transmitted during a rotation of the rotor 30 from the rotor 30 to the flexible drive shaft 3. Via the flexible drive shaft, the torque is transmitted to the conveying element 6, so that the pump assembly 1 is driven by the motor 7.
• the rotor 30 is axially supported by two bearings 32, 33.
• One of these bearings 33 is biased by a spring element 34 for axial stabilization of the rotor 30.
• the spring element 34 may be embodied, for example, as a helical spring or as an annular spring.
• the bearings 32, 33 may each be designed as a ball bearing or as a sliding bearing. If the bearings 32, 33 are designed as ball bearings, the bearings 32, 33 comprise ceramic balls and cages made of plastic, so that the ball bearings have non-magnetizable material.
• the rings of the bearings can be made, for example, from a magnetizable metal or from a non-magnetizable material.
• the bearings 32, 33 are designed as plain bearings, they each comprise sliding partners made of DLC-coated implant steel and yttrium-stabilized zirconium oxide.
• the rotor magnet 31 has a biocompatible DLC coating 35.
• the motor 7 has a stator 36.
• the stator 36 includes a plurality of windings 37, which are electrically conductively connected to power terminals 38.
• the stator 36 has return plates 39.
• the windings 37 are potted with a biocompatible epoxy resin containing thermally conductive alumina. Between an inner side of the coating of the windings 37 and an outer side of the coating 35 of the rotor magnet 31, a gap 40 is formed with an annular cross-section.
• the gap 40 has a width of 0.2 mm.
• This gap 40 is in fluid communication with a flushing port 41 which is connected to a flushing port 42, wherein the flushing port 42 is disposed at a proximal end of the motor 7.
• the gap 40 is in fluid communication with a gap formed between the drive shaft 3 and the catheter 2.
• a glucose solution may be flushed via the purge port 42 through the purge port 41 and the gap 40 and the clearance.
• the rotor 30 is lapped during operation of the glucose solution.
• a radial distance between an outer side of the rotor magnet 31 and an inner side of the windings 37 is 0.5 mm.
• An inner radius of the windings 37 corresponds to 1.1 times an outer radius of the rotor magnet 31.
• the stator 36 and the rotor 30 are non-detachably connected together for a user and enclosed in a motor housing 43.
• the motor housing 43 may be connected, for example, with a handle or a heat sink. Due to the small distance between the windings 37 and the rotor magnet 31, the motor can be operated very efficiently, so that both the motor housing 43 and a possibly connected thereto handle or heat sink is heated at its touchable surfaces to less than 40 ° C, if the pump assembly 1 is operated at a speed of 32,000 revolutions per minute and a capacity of 2.5 I per minute.
• the motor T shown in FIG. 6 differs from the motor 7 shown in FIG. 6 only in that the stator 36 in this embodiment has a liquid-tight sleeve 44 which limits the gap 40.
• the width of the gap 40 is 0.15 mm.
• the sleeve 44 includes
• Polyetheretherketone and is magnetically inactive.
• the sleeve 44 is arranged such that, for example, the windings 37 and weathered parts of the stator 36 are separated by the sleeve 44 from the optionally flowing through the gap 40 rinsing liquid.
• An extension of the sleeve 44 in the axial direction is approximately 1.2 times an axial extent of the rotor magnet 31.

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• 2015
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