WO2016047332A1 - 遠心ポンプの製造方法および遠心ポンプ - Google Patents

遠心ポンプの製造方法および遠心ポンプ Download PDF

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Publication number
WO2016047332A1
WO2016047332A1 PCT/JP2015/073564 JP2015073564W WO2016047332A1 WO 2016047332 A1 WO2016047332 A1 WO 2016047332A1 JP 2015073564 W JP2015073564 W JP 2015073564W WO 2016047332 A1 WO2016047332 A1 WO 2016047332A1
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WO
WIPO (PCT)
Prior art keywords
centrifugal pump
blood
manufacturing
lid member
bottom member
Prior art date
Application number
PCT/JP2015/073564
Other languages
English (en)
French (fr)
Inventor
翔太郎 田中
洋介 板持
Original Assignee
テルモ株式会社
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Filing date
Publication date
Application filed by テルモ株式会社 filed Critical テルモ株式会社
Priority to JP2016550042A priority Critical patent/JPWO2016047332A1/ja
Publication of WO2016047332A1 publication Critical patent/WO2016047332A1/ja

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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/18—Working by laser beam, e.g. welding, cutting or boring using absorbing layers on the workpiece, e.g. for marking or protecting purposes
    • 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
    • A61M60/422—Details relating to driving for non-positive displacement blood pumps the force acting on the blood contacting member being electromagnetic, e.g. using canned motor pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/08—Devices involving relative movement between laser beam and workpiece
    • B23K26/0823—Devices involving rotation of the workpiece
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B23K26/24—Seam welding
    • B23K26/28—Seam welding of curved planar seams
    • B23K26/282—Seam welding of curved planar seams of tube sections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
    • B23K37/0426—Fixtures for other work
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    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
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    • B29C65/1635—Laser beams characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. laser transmission welding
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    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
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    • B29C66/1288—Stepped joint cross-sections comprising at least one monotone curved joint-segment
    • B29C66/12881—Stepped joint cross-sections comprising at least one monotone curved joint-segment comprising at least two monotone curved joint-segments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/65—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles with a relative motion between the article and the welding tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/733—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence
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    • B29C66/73365—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light at least one of the parts to be joined being transparent or translucent to visible light
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    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/731—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the intensive physical properties of the material of the parts to be joined
    • B29C66/7311—Thermal properties
    • B29C66/73115—Melting point
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/748—Machines or parts thereof not otherwise provided for
    • B29L2031/7496—Pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/753—Medical equipment; Accessories therefor

Definitions

  • the present invention relates to a method for manufacturing a centrifugal pump and a centrifugal pump.
  • blood pumps that transport blood include turbo pumps that pump blood by centrifugal force.
  • a shaft member is known (for example, see Patent Document 1).
  • the centrifugal pump having such a configuration is generally configured with a bottom member and a lid member joined to the bottom member from the viewpoint of easy assembly.
  • the bottom member and the lid member are bonded or welded with a solvent, an adhesive, or the like interposed therebetween.
  • An object of the present invention is to provide a method of manufacturing a centrifugal pump capable of bonding a bottom member and a lid member with high bonding strength and good, and a centrifugal pump manufactured by such a method.
  • a housing constituted by a hollow body, having a blood inflow port through which the blood flows in, and a blood outflow port through which the blood flowing in from the blood inflow port flows out.
  • a manufacturing method of manufacturing a centrifugal pump that is rotatably accommodated in the hollow portion and includes a centrifugal force applying member that applies centrifugal force to blood by the rotation,
  • the housing is joined in an assembled state in which the bottom member and the lid member are assembled.
  • the bottom member has a first wall portion that protrudes toward the lid member and extends around the rotation center axis of the centrifugal force imparting member
  • the lid member has a second wall portion that protrudes toward the bottom member and extends around the rotation center axis
  • one of the first wall and the second wall is positioned outside the other wall, and the inner peripheral surface of the one wall and the wall.
  • the first wall portion and the second wall portion each have a thin wall portion having a thin wall thickness
  • the centrifugal pump manufacturing method according to (4) wherein the thin-walled portions are fused.
  • Each of the bottom member and the lid member has optical transparency.
  • a light absorbing material supplying step of supplying a light absorbing material to at least one of the inner peripheral surface of the one wall portion and the outer peripheral surface of the other wall portion is provided.
  • the light absorbing material supplying step the light absorbing material is supplied to a wall portion located on the inner side of the first wall portion and the second wall portion. Manufacturing method of centrifugal pump.
  • a bottom member and a lid member assembled, a housing having a blood inlet into which blood flows and a blood outlet from which blood flowing in from the blood inlet flows out;
  • a centrifugal pump that is housed rotatably in the housing and includes a centrifugal force applying member that applies centrifugal force to blood by the rotation,
  • the bottom member and the lid member when the bottom member and the lid member are joined, the bottom member and the lid member are fused by irradiating the vicinity of the boundary between the bottom member and the lid member in an assembled state.
  • the bottom member and the lid member can be joined with good uniformity and high joining strength. Therefore, even if a centrifugal pump is used for a long time, problems such as generation of cracks can be prevented or suppressed.
  • FIG. 1 is a sectional side view showing an embodiment of the centrifugal pump of the present invention.
  • FIG. 2 is a cross-sectional plan view showing an embodiment of the centrifugal pump of the present invention.
  • FIG. 3 is a longitudinal sectional view showing a method for manufacturing a centrifugal pump according to the present invention, and is a view showing a preparation process.
  • FIG. 4 is a longitudinal sectional view showing a method for manufacturing a centrifugal pump according to the present invention, and is a view showing a joining step.
  • FIG. 1 is a sectional side view showing an embodiment of the centrifugal pump of the present invention.
  • FIG. 2 is a cross-sectional plan view showing an embodiment of the centrifugal pump of the present invention.
  • FIG. 3 is a longitudinal sectional view showing a method for manufacturing a centrifugal pump according to the present invention, and is a view showing a preparation process.
  • FIG. 4 is a longitudinal sectional view showing a method for manufacturing a centrifugal pump according to the present invention, and is a view showing a joining step.
  • FIGS. 1 and 3 the upper side of FIGS. 1 and 3 (the same applies to FIGS. 5 to 9) is referred to as “upper” or “upper”, and the lower side is referred to as “lower” or “lower”.
  • a centrifugal pump 1 shown in FIG. 1 supports a housing 2 configured by a hollow body, a rotating body (impeller) 3 rotatably accommodated in the housing 2, and the rotating body 3 rotatably supported by the housing 2. And a support mechanism 4.
  • a housing 2 configured by a hollow body, a rotating body (impeller) 3 rotatably accommodated in the housing 2, and the rotating body 3 rotatably supported by the housing 2.
  • a support mechanism 4 4.
  • the housing 2 has a housing body 20, a blood inflow port 25 through which blood Q flows in, and a blood outflow port 26 through which blood Q flows out.
  • the housing body 20 is constituted by a flat cylindrical member, and has a bottom member 21 and a lid member 22 in which a blood inflow port 25 and a blood outflow port 26 are formed, and these are joined in an assembled state. It will be.
  • the bottom member 21 has a disk shape, has a side wall (first wall portion) 211 that protrudes from the edge of the upper surface and extends in the circumferential direction. Further, the side wall 211 has a thin portion 212 having a thin thickness at an upper end portion thereof and a constant thickness portion 213 having a constant thickness. The thin portion 212 is provided over the entire circumferential direction of the housing body 20. Further, the thin portion 212 is thinner toward the upper side, and the inner peripheral surface 212a is inclined (see FIG. 5).
  • the lid member 22 includes a top plate 221 and a side wall (second wall portion) 222 that is formed to protrude from the edge of the lower surface of the top plate 221 and extends in the circumferential direction.
  • the side wall 222 includes a thin portion 223 that is provided at the lower end of the constant thickness portion 224 and has a small thickness, and a constant thickness portion 224 that has a constant thickness.
  • the thin portion 223 is provided over the entire circumferential direction of the housing body 20. Moreover, the thin part 223 becomes thin toward the lower side, and the outer peripheral surface 223a is inclined (see FIG. 5).
  • the thin portion 212 is located outside the thin portion 223.
  • a boundary portion between the thin portion 212 and the thin portion 223 is a fused portion 100 that is fused by irradiating the vicinity of the boundary portion with laser light.
  • the fused part 100 is formed over the entire circumference of the housing body 20. This will be described in detail later.
  • the blood inflow port 25 and the blood outflow port 26 communicate with the pump chamber 24, respectively. Then, the blood Q flowing in from the blood inflow port 25 can flow out from the blood outflow port 26 via the pump chamber 24.
  • the blood inflow port 25 is formed in a tubular (cylindrical) shape so as to protrude from the center of the top plate 221 (one end).
  • the blood inflow port 25 is bent halfway in the longitudinal direction, and can be divided into a root portion 252 on the top plate 221 side and a connection portion 253 on the opposite side with the bent portion 251 as a boundary portion.
  • the connecting portion 253 is provided to be inclined with respect to the rotation axis of the rotating body 3.
  • a tube constituting a blood circuit can be connected to the connection portion 253.
  • the blood outflow port 26 is formed in a tubular shape on the outer peripheral surface (outer peripheral portion) of the side wall 222.
  • the blood outflow port 26 protrudes toward the tangential direction of the outer peripheral surface of the side wall 222.
  • a disk-shaped rotating body 3 is concentrically disposed.
  • the rotating body 3 is a centrifugal force applying member that applies a centrifugal force to the blood Q by rotating.
  • the rotating body 3 has a plurality (six in the illustrated configuration) of blood flow passages 31 through which the blood Q passes.
  • These blood flow paths 31 are formed radially from the center of the rotating body 3. Further, the central side portions of the rotator 3 of each blood flow path 31 merge (intersect) with each other, and open to the upper surface 32 of the rotator 3.
  • the part of the blood channel 31 opposite to the center side of the rotator 3 is open to the outer peripheral surface 33 of the rotator 3.
  • a gap 241 is formed between the outer peripheral surface 33 of the rotating body 3 and the inner peripheral surface of the side wall 222 of the housing 2.
  • the rotating body 3 is provided with a magnet in the lower part of the blood flow path 31.
  • a plurality of (for example, six) permanent magnets 34 are used.
  • the centrifugal pump 1 is driven, the centrifugal pump 1 is mounted on an external drive means (not shown) with the bottom member 21 of the housing 2 facing down so that a shaft member 5 described later is parallel to the vertical direction. To do.
  • the centrifugal pump 1 is used in this mounted state.
  • the external drive means has, for example, a motor and a permanent magnet connected to the motor, and this permanent magnet attracts the permanent magnet 34 built in the centrifugal pump 1 by magnetic force. And if a motor rotates in this state, the rotational force will be transmitted via the attracting magnets, and the rotary body 3 can also rotate.
  • the diameter of the rotating body 3 is not particularly limited, but is preferably 20 to 200 mm, for example, and more preferably 30 to 100 mm.
  • the thickness of the rotating body 3 is not particularly limited, but is preferably 3 to 40 mm, for example, and more preferably 5 to 30 mm.
  • the maximum number of rotations of the rotator 3 is not particularly limited, but is preferably, for example, 2000 to 6000 rpm, and more preferably 2500 to 5000 rpm.
  • acrylic resin polyethylene, such as hard polyvinyl chloride, polyethylene, a polypropylene, a polystyrene, a polycarbonate, an acrylic resin, a polymethylmethacrylate (PMMA)
  • examples thereof include various hard resins such as polyester such as terephthalate (PET) and polybutylene terephthalate (PBT), polysulfone and polyarylate.
  • PET terephthalate
  • PBT polybutylene terephthalate
  • polysulfone polyarylate
  • the constituent material of the housing 2 shall have a light transmittance among said resin materials.
  • the melting point of the constituent material of the housing 2 is not particularly limited, but is preferably about 200 to 400 ° C., more preferably about 250 to 350 ° C.
  • the fixation after the fusion is accelerated, and the fusion property of the fusion part 100 and the uniformity of the fusion are further improved.
  • the rotating body 3 is rotatably supported with respect to the housing 2 via a support mechanism 4.
  • the support mechanism 4 rotatably supports the shaft member 5, the first bearing 6 that rotatably supports the upper end portion (one end portion) of the shaft member 5, and the lower end portion (other end portion) of the shaft member 5.
  • the shaft member 5 is installed at the rotation center of the rotating body 3.
  • the shaft member 5 is composed of a rod-like member having rounded ends.
  • ceramic is used as the constituent material of the shaft member 5
  • both ends of the shaft member 5 are polished to improve the slidability of both ends when the shaft member 5 rotates.
  • a metal material is used as the constituent material of the shaft member 5
  • both ends of the shaft member 5 are polished and coated with, for example, diamond-like carbon (DLC) or titanium. Good. Thereby, the slidability and durability of both ends when the shaft member 5 rotates is improved.
  • DLC diamond-like carbon
  • the first bearing 6 is installed and fixed to a first bearing installation part (concave part) 254 formed to be recessed in the inner peripheral part of the connection part 253 of the blood inflow port 25.
  • the second bearing 7 is installed and fixed to a second bearing installation part 225 formed to be recessed in the center of the bottom member 21 of the housing 2.
  • the method of fixing the first bearing 6 and the second bearing 7 to the housing 2 is not particularly limited. For example, a method by fitting, a method by adhesion (adhesion with an adhesive or a solvent), or fusion (heat) A method by fusion, high frequency fusion, ultrasonic fusion, etc.), a method by insert molding, and the like.
  • the manufacturing method of the centrifugal pump 1 includes [1] a preparation step, [2] a light absorbing material supply step, [3] an assembly step, and [4] a joining step.
  • the jig 8 includes a holder 81 that holds the bottom member 21 and a pressurizer 82 that applies pressure to the bottom member 21 and the lid member 22.
  • the holder 81 has a disk shape (block shape), and a concave portion 811 for inserting and fixing the lower end portion of the bottom member 21 is formed on the upper surface thereof.
  • the holder 81 is fixed to a turntable (not shown) and is rotatable around the rotation center of the rotating body 3.
  • the pressurizing tool 82 has a bottomed cylindrical shape with a circular cross section, and has an internal space 821 into which the blood inflow port 25 can be inserted.
  • the internal space 821 functions as a relief portion for the blood inflow port 25 when the housing body 20 is pressurized.
  • the lower end surface 822 of the pressurizing tool 82 is inclined along the shape of the top plate 221 of the lid member 22.
  • a light absorbing material 200 that absorbs laser light is applied (supplied) to the surface of the thin portion 223 of the lid member 22.
  • the light absorbing material 200 include a powder such as carbon black, a liquid (paste) containing the powder and a dye described later, or a sheet (layer) containing the powder and the dye.
  • a liquid (paste-like) light absorbing material 200 is used, and the light absorbing material 200 includes an end surface 223b of the thin portion 223, an outer peripheral surface 223a of the thin portion 223, and an end surface 224a of the constant thickness portion 224.
  • the end surface 223b, the outer peripheral surface 223a, and the end surface 224a are continuous, and their boundaries are rounded. Thereby, when apply
  • the surface to be applied is a curved or bent irregular shape as in this embodiment. Suitable for
  • the application method of the liquid (paste-like) light absorbing material 200 is not particularly limited, and any application method such as spray coating (brush coating), brush coating, dipping, or dropping may be used.
  • the sheet-shaped light absorbing material 200 when used, a sheet-shaped light absorbing material 200 punched out (cut) into the same shape (annular shape) as the thin portion 223 is prepared, which will be described later. [2] In the assembling process, the thin portion 212 and the thin portion 223 are interposed.
  • the sheet-shaped light absorbing material 200 an annular thing is prepared (manufactured) in advance, and it is only necessary to attach it to the target site, so compared to the case where the paste-shaped light absorbing material 200 is used, There is an advantage that the intervening operation is simple.
  • the light absorbing material (laser light absorbing material) constituting the light absorbing material 200 the following can be used which does not reduce the transparency of the fused portion 100 as much as possible.
  • a light-absorbing substance absorption in the visible light region (0.4 ⁇ m or more and less than 0.7 ⁇ m) is small, and a high molar absorbance coefficient is exhibited in a narrow absorption band in a laser light wavelength region of 0.7 to 2.5 ⁇ m.
  • dyes such as cyanine dyes, squallium dyes, and croconium dyes are preferable.
  • a compound represented by the following chemical formula 1 as a cyanine dye, a compound represented by the following chemical formula 2, as a squarinium dye, a compound represented by the following chemical formula 2, and as a croconium dye, a compound represented by the following chemical formula 3.
  • a compound represented by the following chemical formula 3 can be used as a cyanine dye.
  • the laser light absorbing material as described above As the light absorbing material 200, it is possible to suppress the decrease in the transparency of the fused portion 100 as much as possible, so that the bottom member 21 and the lid member 22 made of a transparent material are used. Further, it is possible to prevent the fused portion 100 from being colored and conspicuous and impairing the appearance uniformity.
  • the light absorbing material 200 may be supplied to the thin portion 223 using a molding method such as two-color molding using the same material as the housing, for example, a material kneaded in polycarbonate.
  • centrifugal pump 1 (hereinafter, the assembled centrifugal pump 1 is also referred to as “centrifugal pump 1 ′”) is fixed in the concave portion 811 of the holder 81, and the lower end surface 822 of the pressurizing tool 82 is fixed to the ceiling. Arranged on the upper surface of the plate 221.
  • laser light L is irradiated toward the light absorbing material 200.
  • the laser light L passes through the thin portion 212 of the bottom member 21 and is irradiated on the light absorbing material 200. Since the laser light L irradiated to the light absorbing material 200 is efficiently absorbed by the light absorbing material 200 and converted to heat, fusion can be efficiently performed with low output.
  • the light source of the laser light L is fixed, and the holder 81 is rotated together with the centrifugal pump 1 ′ to irradiate the laser light L over the entire circumference of the light absorbing material 200.
  • the bottom member 21 and the lid member 22 can be fused over the entire circumference, that is, the fused portion 100 can be formed over the entire circumference of the housing 2. Therefore, the fusion strength (bonding strength) can be improved.
  • the laser beam extends over the entire length in the vertical direction in FIG. 6 of the overlapping portion 300 in which the thin portion 212 of the bottom member 21 and the thin portion 223 of the lid member 22 overlap in the radial direction of the housing 2.
  • L is irradiated.
  • melting part 100 can be formed by the simple method of rotating the centrifugal pump 1 '1 time, irradiating the laser beam L.
  • the joining area (fusion area) can be made as large as possible. Therefore, the bottom member 21 and the lid member 22 can be bonded with higher bonding strength. Further, since the thin portion 212 is thin, attenuation can be suppressed when the laser light L is transmitted.
  • the inner peripheral surface 212 a of the thin portion 212 and the outer peripheral surface 223 a of the thin portion 223 are provided to be inclined with respect to the rotation center of the rotating body 3.
  • melting part 100 can obtain high fusion strength (bonding strength). As a result, it is possible to prevent or suppress cracks and the like caused by stress concentration on the fused part 100 and its peripheral part during use of the centrifugal pump.
  • a process of washing the centrifugal pump 1 to remove debris during the production of the centrifugal pump 1 (such as washing and drying after washing).
  • bonding can be performed in a relatively short period of time as compared with adhesion using an adhesive or fusion using a solvent.
  • the separately prepared light absorbing material 200 it is not necessary to color the bottom member 21 or the lid member 22 itself in order to absorb the laser beam, and the bottom member 21 and the lid member 22 are substantially transparent. Therefore, the internal visibility can be sufficiently ensured.
  • the type of laser light L to be irradiated is not particularly limited, and examples thereof include a semiconductor laser, a CO 2 laser, a YAG laser, an excimer laser, and the like.
  • a semiconductor laser is particularly energy efficient and has a long lifetime. This is preferable.
  • the wavelength of the laser beam L to be irradiated generally depends on the type of the laser beam L, but in the case of a semiconductor laser, the wavelength is preferably about 800 to 1000 nm.
  • the beam diameter of the laser beam L is not particularly limited, but is preferably the same as or slightly larger than the length of the overlapping portion 300 in the vertical direction in FIG. Thereby, the laser beam L is reliably irradiated over the entire length of the light absorbing material 200 in the vertical direction in FIG. 6 by a simple method of rotating the bottom member 21 and the lid member 22 while irradiating the overlapping portion 300 with the laser beam L. Can be irradiated. Therefore, fusion can be performed easily.
  • the pressure member 82 presses (presses) the bottom member 21 and the lid member 22 in the direction in which they approach each other. Thereby, the fusion strength can be further increased.
  • the pressurizing tool 82 presses the edge of the top plate 221 of the lid member 22, that is, the vicinity of the base of the side wall 222 with the lower end surface 822. Thereby, the pressing force (restraining force) of the pressurizing tool 82 is efficiently transmitted to the side wall 222. Therefore, positional displacement between the bottom member 21 and the lid member 22 due to pressing can be prevented, and the boundary between the bottom member 21 and the lid member 22 can be pressed as uniformly as possible over the entire circumference of the housing 2.
  • the distance between the second bearing 7 and the bearing 7 is 98 to 99%.
  • the fusion strength between the bottom member 21 and the lid member 22 compared to the conventional joining method. can be increased.
  • centrifugal pump and centrifugal pump of this invention were demonstrated about embodiment of illustration, this invention is not limited to this, Each part which comprises a centrifugal pump exhibits the same function. It can be replaced with any configuration obtained. Moreover, arbitrary components (processes) may be added.
  • the assembly process is performed after performing a light absorption material supply process, it is not limited to this in this invention, You may perform a light absorption material supply process after performing an assembly process.
  • a light absorbing material can be interposed at the boundary between the bottom member and the lid member by utilizing capillary action.
  • the light absorbing material is supplied to the thin portion of the lid member in the light absorbing step.
  • the present invention is not limited to this, and the light absorbing material is supplied to the thin portion of the bottom member.
  • the light absorbing material may be supplied to both the thin portion of the bottom member and the thin portion of the lid member.
  • the thin part of a bottom member is located in the outer side of the thin part of a cover member, in this invention, it is not limited to this,
  • the thin part of a bottom member is the thin part of a cover member. It may be located inside.
  • the method for manufacturing a centrifugal pump according to the present invention comprises a hollow body, communicates with the hollow part, blood flows into the blood, and communicates with the hollow part, and the blood flowing in from the blood inlet flows out.
  • a manufacturing method for manufacturing a centrifugal pump comprising: a housing having a blood outlet; and a centrifugal force applying member that is rotatably accommodated in the hollow portion and applies centrifugal force to blood by the rotation.
  • the bottom member and the lid member are joined in an assembled state, and an assembly process for obtaining the assembled state and a laser beam near the boundary between the bottom member and the lid member in the assembled state. It is characterized by comprising a fusing step of fusing the bottom member and the lid member by irradiation. Therefore, the bottom member and the lid member can be bonded with high bonding strength and satisfactory.

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Abstract

　本発明の遠心ポンプの製造方法は、ハウジング２と、ハウジング２内に回転可能に収納された回転体３と、回転体３を支持する支持機構４とを備える遠心ポンプ１を製造する方法であり、底部材２１と蓋部材２２とを組立てる組立工程と、組立状態で、底部材２１と蓋部材２２との境界部付近にレーザ光Ｌを照射することにより、底部材２１と蓋部材２２との融着を行う融着工程とを有している。

Description

遠心ポンプの製造方法および遠心ポンプ
　本発明は、遠心ポンプの製造方法および遠心ポンプに関する。
　従来、血液を搬送する血液ポンプとしては、遠心力によって血液を送り出すターボ型のポンプがあり、中空のハウジングと、ハウジング内に回転可能に収納されたインペラと、インペラの回転中心となる回転軸（軸部材）とを備えるものが知られている（例えば、特許文献１参照）。
　このような構成の遠心ポンプでは、組立て易いという観点から、一般的には、底部材と、底部材に接合される蓋部材とで構成されている。また、この場合、底部材と蓋部材とは、それらの境界部に溶剤や接着剤等を介在させて接着または溶着を行う。
　しかしながら、上記の方法で遠心ポンプを製造した場合、遠心ポンプの使用時間や、インペラの回転数等によっては、底部材と蓋部材との境界部付近に応力が集中し、その結果、境界部付近にクラックが発生するおそれがある。
米国特許第２８１０３４９号明細書
　本発明の目的は、底部材および蓋部材を高い接合強度で、かつ、良好に接合することができる遠心ポンプの製造方法およびかかる方法によって製造される遠心ポンプを提供することにある。
　このような目的は、下記（１）～（８）の本発明により達成される。
　（１）　中空体で構成され、その中空部に連通し、血液が流入する血液流入口と、前記中空部に連通し、前記血液流入口から流入した血液が流出する血液流出口とを有するハウジングと、
　前記中空部内に回転可能に収納され、その回転により血液に遠心力を付与する遠心力付与部材とを備える遠心ポンプを製造する製造方法であって、
　前記ハウジングは、底部材と蓋部材とを組立てた組立状態で接合されてなるものであり、
　前記組立状態とする組立工程と、
　前記組立状態で、前記底部材と前記蓋部材との境界部付近にレーザ光を照射することにより、前記底部材と前記蓋部材との融着を行う融着工程とを有することを特徴とする遠心ポンプの製造方法。
　（２）　前記融着工程では、前記底部材および前記蓋部材を回転させつつ前記レーザ光の照射を行い、全周にわたって前記融着を行う上記（１）に記載の遠心ポンプの製造方法。
　（３）　前記レーザ光は、半導体レーザによるものである上記（１）または（２）に記載の遠心ポンプの製造方法。
　（４）　前記底部材は、前記蓋部材に向って突出形成され、前記遠心力付与部材の回転中心軸回りに延在する第１の壁部を有し、
　前記蓋部材は、前記底部材に向って突出形成され、前記回転中心軸回りに延在する第２の壁部を有し、
　前記融着工程では、前記第１の壁部および前記第２の壁部のうちの一方の壁部が他方の壁部の外側に位置した状態で、前記一方の壁部の内周面と前記他方の壁部の外周面とを融着する上記（１）ないし（３）のいずれかに記載の遠心ポンプの製造方法。
　（５）　前記第１の壁部および前記第２の壁部は、壁厚が薄くなっている薄肉部をそれぞれ有し、
　前記融着工程では、前記各薄肉部同士を融着する上記（４）に記載の遠心ポンプの製造方法。
　（６）　前記底部材および前記蓋部材は、それぞれ光透過性を有するものであり、
　前記組立工程に先立って、前記一方の壁部の内周面と前記他方の壁部の外周面とのうちの少なくとも一方の面に光吸収材を供給する光吸収材供給工程を有している上記（４）または（５）に記載の遠心ポンプの製造方法。
　（７）　前記光吸収材供給工程では、前記第１の壁部および前記第２の壁部のうちの内側に位置している壁部に前記光吸収材を供給する上記（６）に記載の遠心ポンプの製造方法。
　（８）　底部材と蓋部材とを組立てたものであり、血液が流入する血液流入口と、前記血液流入口から流入した血液が流出する血液流出口とを有するハウジングと、
　前記ハウジング内に回転可能に収納され、その回転により血液に遠心力を付与する遠心力付与部材とを備える遠心ポンプであって、
　上記（１）ないし（７）のいずれかに記載の遠心ポンプの製造方法により製造されることを特徴とする遠心ポンプ。
　本発明によれば、底部材および蓋部材を接合する際、組立状態で、底部材および蓋部材の境界部付近にレーザ光を照射することにより、底部材および蓋部材の融着を行うため、均一で良好、かつ、高い接合強度で底部材および蓋部材を接合することができる。よって、長時間遠心ポンプを使用しても、クラックの発生等の不具合を防止または抑制することができる。
図１は、本発明の遠心ポンプの実施形態を示す断面側面図である。 図２は、本発明の遠心ポンプの実施形態を示す断面平面図である。 図３は、本発明の遠心ポンプの製造方法を示す縦断面図であって、用意工程を示す図である。 図４は、本発明の遠心ポンプの製造方法を示す縦断面図であって、接合工程を示す図である。 図５は、本発明の遠心ポンプの製造方法を示す縦断面図であって、図３に示すハウジングの部分拡大図である。 図６は、本発明の遠心ポンプの製造方法を示す縦断面図であって、図４に示すハウジングの部分拡大図である。
　以下、本発明の遠心ポンプの製造方法および遠心ポンプを添付図面に示す好適な実施形態に基づいて詳細に説明する。
　＜第１実施形態＞
　図１は、本発明の遠心ポンプの実施形態を示す断面側面図である。図２は、本発明の遠心ポンプの実施形態を示す断面平面図である。図３は、本発明の遠心ポンプの製造方法を示す縦断面図であって、用意工程を示す図である。図４は、本発明の遠心ポンプの製造方法を示す縦断面図であって、接合工程を示す図である。図５は、本発明の遠心ポンプの製造方法を示す縦断面図であって、図３に示すハウジングの部分拡大図である。図６は、本発明の遠心ポンプの製造方法を示す縦断面図であって、図４に示すハウジングの部分拡大図である。
　なお、以下では、説明の都合上、図１、図３（図５～図９についても同様）の上側を「上」または「上方」、下側を「下」または「下方」と言う。
　図１に示す遠心ポンプ１は、中空体で構成されたハウジング２と、ハウジング２内に回転可能に収納された回転体（インペラ）３と、回転体３をハウジング２に対し回転可能に支持する支持機構４とを備えている。以下、各部の構成について説明する。
　ハウジング２は、ハウジング本体２０と、血液Ｑが流入する血液流入ポート２５と、血液Ｑが流出する血液流出ポート２６とを有している。
　ハウジング本体２０は、偏平な円筒状の部材で構成され、底部材２１と、血液流入ポート２５および血液流出ポート２６が形成された蓋部材２２とを有し、これらを組立てた組立状態で接合されてなるものである。
　底部材２１は、円板状をなし、その上面の縁部から突出形成され、周方向に延在する側壁（第１の壁部）２１１を有している。また、側壁２１１は、その上端部に厚さが薄くなっている薄肉部２１２と、厚さが一定の厚さ一定部２１３とを有している。薄肉部２１２は、ハウジング本体２０の周方向の全域にわたって設けられている。また、薄肉部２１２は、上側に向って厚さが薄くなっており、その内周面２１２ａは傾斜している（図５参照）。
　蓋部材２２は、天板２２１と、天板２２１の下面の縁部から突出形成され、周方向に延在する側壁（第２の壁部）２２２とを有している。また、側壁２２２は、厚さ一定部２２４の下端部に設けられ、厚さが薄くなっている薄肉部２２３と、厚さが一定の厚さ一定部２２４とを有している。薄肉部２２３は、ハウジング本体２０の周方向の全域にわたって設けられている。また、薄肉部２２３は、下側に向って厚さが薄くなっており、その外周面２２３ａは傾斜している（図５参照）。
　また、組立状態では、薄肉部２１２は、薄肉部２２３の外側に位置している。薄肉部２１２と薄肉部２２３との境界部は、当該境界部付近にレーザ光を照射することにより、融着された融着部１００となっている。この融着部１００は、ハウジング本体２０の全周にわたって形成されている。このことについては、後に詳述する。
　そして、底部材２１と蓋部材２２とで囲まれた偏平な空間（中空部）がポンプ室２４となる。
　また、血液流入ポート２５と血液流出ポート２６とは、それぞれ、ポンプ室２４に連通している。そして、血液流入ポート２５から流入した血液Ｑは、ポンプ室２４を介して、血液流出ポート２６から流出することができる。
　図１に示すように、血液流入ポート２５は、天板２２１（一端部）の中心部に管状（円筒状）に突出形成されている。血液流入ポート２５は、その長手方向の途中が屈曲しており、当該屈曲部２５１を境界部として天板２２１側の根元部２５２と、それと反対側の接続部２５３とに分けることができる。接続部２５３は、回転体３の回転軸に対して傾斜して設けられている。この接続部２５３には、例えば血液回路を構成するチューブを接続することができる。
　図２に示すように、血液流出ポート２６は、側壁２２２の外周面（外周部）に管状に突出形成されている。この血液流出ポート２６は、側壁２２２の外周面の接線方向に向かって突出している。
　ハウジング本体２０のポンプ室２４内には、円盤状をなす回転体３が同心的に配置されている。この回転体３は、回転することにより、血液Ｑに遠心力を付与する遠心力付与部材である。
　図２に示すように、回転体３は、血液Ｑが通過する複数本（図示の構成では６本）の血液流路３１を有している。これらの血液流路３１は、回転体３の中心から放射状に形成されている。また、各血液流路３１の回転体３の中心側の部分同士は、互いに合流（交差）しており、回転体３の上面３２に開口している。一方、血液流路３１の回転体３の中心側と反対側の部分は、それぞれ、回転体３の外周面３３に開口している。また、回転体３の外周面３３とハウジング２の側壁２２２の内周面との間には、間隙２４１が形成されている。
　そして、このような回転体３が、ハウジング２を上から見たような図２のように軸部材５を中心に時計回りに回転すると、血液流入ポート２５から流入した血液Ｑは、各血液流路３１にその回転体３の中心側の部分から入り込み、遠心力を受けて、血液流路３１を流下する。この流下した血液Ｑは、間隙２４１内に流出する。その後、血液Ｑは、間隙２４１内で図２中の時計回りの回転力を受けて、血液流出ポート２６に至ると、当該血液流出ポート２６から確実に排出されることとなる。
　図１に示すように、回転体３には、血液流路３１の下側の部分に、磁石が設置されている。なお、図１に示す構成では、複数（例えば６つ）の永久磁石３４を用いている。遠心ポンプ１を駆動するに際しては、後述する軸部材５が鉛直方向と平行となるようにハウジング２の底部材２１を下側にして、当該遠心ポンプ１を外部駆動手段（図示せず）に装着する。この装着状態で遠心ポンプ１が使用される。外部駆動手段は、例えば、モータと、モータに連結された永久磁石とを有し、この永久磁石が遠心ポンプ１に内蔵された永久磁石３４と磁力により引き付け合う。そして、この状態でモータが回転すると、その回転力が前記引き付け合う磁石同士を介して伝達されて、回転体３も回転することができる。
　なお、回転体３の直径は、特に限定されないが、例えば、２０～２００ｍｍであるのが好ましく、３０～１００ｍｍであるのがより好ましい。回転体３の厚さは、特に限定されないが、例えば、３～４０ｍｍであるのが好ましく、５～３０ｍｍであるのがより好ましい。回転体３の最大回転数は、特に限定されないが、例えば、２０００～６０００ｒｐｍであるのが好ましく、２５００～５０００ｒｐｍであるのがより好ましい。
　また、回転体３およびハウジング２の構成材料としては、特に限定されず、例えば、硬質ポリ塩化ビニル、ポリエチレン、ポリプロピレン、ポリスチレン、ポリカーボネート、アクリル樹脂、ポリメチルメタクリレート（ＰＭＭＡ）等のアクリル系樹脂、ポリエチレンテレフタレート（ＰＥＴ）、ポリブチレンテレフタレート（ＰＢＴ）のようなポリエステル、ポリサルフォン、ポリアリレート等の各種硬質樹脂が挙げられる。また、これらの構成材料うちでも、特に、血液Ｑとの適合性に優れ、また、透明性、成形加工性に優れるという点で、ポリカーボネート、アクリル樹脂が好ましい。なお、ハウジング２の構成材料は、上記の樹脂材料のうち、光透過性を有するものとされる。
　特に、ハウジング２（底部材２１および蓋部材２２）の構成材料の融点は、特に限定されないが、２００～４００℃程度のものが好ましく、２５０～３５０℃程度のものがより好ましい。このような材料を用いることにより、融着後の固定が早くなり、融着部１００の融着性、融着の均一性がより向上する。
　図１に示すように、回転体３は、支持機構４を介してハウジング２に対し回転可能に支持されている。支持機構４は、軸部材５と、軸部材５の上端部（一端部）を回転可能に支持する第１の軸受け６と、軸部材５の下端部（他端部）を回転可能に支持する第２の軸受け７とを有している。
　軸部材５は、回転体３の回転中心に設置されている。軸部材５は、両端部が丸みを帯びた棒状の部材で構成されている。軸部材５の構成材料としてセラミックを用いる場合、軸部材５の両端部は、研磨を施すことで軸部材５が回転する際の両端部の摺動性が向上する。また、軸部材５の構成材料として金属材料を用いる場合、軸部材５の両端部には、研磨を施した上で、例えば、ダイヤモンドライクカーボン（ＤＬＣ）やチタン等のコーティングが施されていてもよい。これにより、軸部材５が回転する際の両端部の摺動性や耐久性が向上する。
　第１の軸受け６は、血液流入ポート２５の接続部２５３の内周部に凹没して形成された第１の軸受け設置部（凹部）２５４に設置、固定されている。第２の軸受け７は、ハウジング２の底部材２１の中心部に凹没して形成された第２の軸受け設置部２２５に設置、固定されている。なお、第１の軸受け６、第２の軸受け７のハウジング２に対する固定方法としては、特に限定されないが、例えば、嵌合による方法、接着（接着剤や溶媒による接着）による方法、融着（熱融着、高周波融着、超音波融着等）による方法、インサート成形による方法等が挙げられる。
　次に、遠心ポンプ１の製造方法について説明する。
　遠心ポンプ１の製造方法は、［１］用意工程と、［２］光吸収材供給工程と、［３］組立工程と、［４］接合工程とを備えている。
　［１］用意工程
　図３および図４に示すように、まず、底部材２１、蓋部材２２、回転体３、支持機構４および治具８を用意する。
　治具８は、底部材２１を保持する保持具８１と、底部材２１および蓋部材２２に加圧を行う加圧具８２とを有している。
　保持具８１は、円板状（ブロック状）をなし、その上面には、底部材２１の下端部を挿入し固定する凹部８１１が形成されている。また、保持具８１は、図示しないターンテーブルに固定されており、回転体３の回転中心回りに回転可能になっている。
　加圧具８２は、横断面形状が円形の有底筒状をなし、その内側に血液流入ポート２５を挿入可能な内部空間８２１を有している。この内部空間８２１は、ハウジング本体２０を加圧する際、血液流入ポート２５の逃げ部として機能する。また、加圧具８２の下端面８２２は、蓋部材２２の天板２２１の形状に沿って傾斜している。
　［２］光吸収材供給工程
　次に、図５に示すように、レーザ光を吸収する光吸収材２００を蓋部材２２の薄肉部２２３の表面に塗布（供給）する。光吸収材２００としては、例えば、カーボンブラック等の粉末、該粉末や後述する染料を含む液状（ペースト状）のもの、または該粉末や該染料を含むシート状（層状）のものが挙げられる。
　本実施形態では、液状（ペースト状）の光吸収材２００を用い、この光吸収材２００を薄肉部２２３の端面２２３ｂと、薄肉部２２３の外周面２２３ａと、厚さ一定部２２４の端面２２４ａとに塗布する。これら端面２２３ｂ、外周面２２３ａおよび端面２２４ａは、連続しており、かつ、それらの境界は丸みを帯びている。これにより、光吸収材２００を塗布する際、光吸収材気泡が混在したりするのを防止または抑制することができる。
　また、液状（ペースト状）の光吸収材２００を用いることにより、光吸収材２００が、その形状が自由に変えられるため、本実施形態のように塗布する面が、湾曲または屈曲した異形の場合に適している。
　液状（ペースト状）の光吸収材２００の塗布方法としては、特に限定されず、スプレーコート（スプレー塗装）、刷毛塗り、ディッピング、滴下等、いずれの塗布方法を用いてもよい。
　なお、例えば、シート状の光吸収材２００を用いる場合、薄肉部２２３の形状と同形状（円環状）に打ち抜かれた（切り取られた）シート状の光吸収材２００を用意し、これを後述の［２］組立工程の際に、薄肉部２１２と薄肉部２２３との間に介在させる。シート状の光吸収材２００を用いることにより、予め円環状のものを用意（製造）しておき、それを目的部位に装着すればよいので、ペースト状の光吸収材２００を用いる場合に比べ、介在させる操作が簡単であるという利点がある。
　また、光吸収材２００を構成する光吸収物質（レーザ光吸収物質）として、次に挙げるような、融着部１００の透明度をできるだけ低下させないものを用いることができる。このような光吸収物質としては、可視光領域（０．４μｍ以上０．７μｍ未満）の吸収が少なく、０．７～２．５μｍのレーザ光波長領域において狭い吸収帯で高いモル吸光度係数を示すものが好ましく、例えば、シアニン染料、スクウォリリウム染料、クロコニウム染料等の染料が挙げられる。
　具体例を挙げて説明すると、例えば、シアニン染料としては、下記化学式１で示される化合物、スクウォリリウム染料としては、下記化学式２で示される化合物、クロコニウム染料としては、下記化学式３で示される化合物を用いることができる。
Figure JPOXMLDOC01-appb-C000001
Figure JPOXMLDOC01-appb-C000002
Figure JPOXMLDOC01-appb-C000003
　光吸収材２００として上記のようなレーザ光吸収物質を用いることにより、融着部１００の透明度の低下を極力抑えることができるので、透明な材料で構成される底部材２１および蓋部材２２に対し、融着部１００が着色されて目立ってしまい、外観上の統一感を損なうということも防止される。
　光吸収材２００がハウジングと同種の素材、例えばポリカーボネートに練り込まれたものを使用し、薄肉部２２３へ２色成形などの成形方法を用いて供給しても良い。
　［３］組立工程
　図４に示すように、回転体３および支持機構４を内側に収納するように、底部材２１および蓋部材２２を組立てる。このとき、蓋部材２２の外周面２２３ａは、底部材２１の内周面２１２ａによって案内されるため、底部材２１に対して容易に位置決めされる。これにより、容易に組立状態とすることができる。
　そして、組立状態の遠心ポンプ１（以下、この組立状態の遠心ポンプ１を「遠心ポンプ１’」とも言う）を保持具８１の凹部８１１内に固定し、加圧具８２の下端面８２２を天板２２１の上面に配置する。
　［４］接合工程
　次に、図６に示すように、レーザ光Ｌを光吸収材２００に向って照射する。レーザ光Ｌは、底部材２１の薄肉部２１２を透過して、光吸収材２００に照射される。光吸収材２００に照射されたレーザ光Ｌは、効率良く光吸収材２００に吸収され、熱に変わるので、低出力で効率的に融着を行うことができる。
　また、レーザ光Ｌの光源を固定し、保持具８１を遠心ポンプ１’ごと回転させて光吸収材２００の全周にわたってレーザ光Ｌを照射する。これにより、底部材２１および蓋部材２２を全周にわたって融着することができる、すなわち、ハウジング２の全周にわたって融着部１００を形成することができる。よって、融着強度（接合強度）の向上を図ることができる。
　また、図６に示すように、底部材２１の薄肉部２１２と、蓋部材２２の薄肉部２２３とがハウジング２の径方向に重なっている重なり部３００の図６中上下方向の全長にわたってレーザ光Ｌを照射する。これにより、レーザ光Ｌを照射しつつ遠心ポンプ１’を１回転させるという簡単な方法で融着部１００を形成することができる。
　また、薄肉部２１２と薄肉部２２３とを接合することにより、できるだけ接合面積（融着面積）をできるだけ大きくすることができる。よって、底部材２１と蓋部材２２とをより高い接合強度で接合することができる。さらに、薄肉部２１２は、厚さが薄くなっているので、レーザ光Ｌが透過する際、減衰を抑制することができる。
　特に、図６に示すように、薄肉部２１２の内周面２１２ａと、薄肉部２２３の外周面２２３ａとは、それぞれ回転体３の回転中心に対して傾斜して設けられている。これにより、遠心ポンプ１の使用中にハウジング２の内圧が上昇した場合、薄肉部２２３の外周面２２３ａが、薄肉部２１２の内周面２１２ａに押しつけられる方向に力が作用する。よって、底部材２１および蓋部材２２が互いに離脱する方向に力が加わったり、それに起因するクラックの発生や融着部１００の破損を確実に防止することができる。
　このように、本発明では、レーザ光Ｌの照射により融着を行うため、従来の接合方法に比べて、接合ムラ（融着ムラ）が少なく、周方向に沿って均一な融着が可能となり、ピンホール、部分剥離、気泡の混入等の融着欠陥も生じ難い。よって、融着部１００は、高い融着強度（接合強度）が得られる。その結果、遠心ポンプの使用中に、融着部１００や、その周辺部に応力が集中することにより生じるクラック等を防止または抑制することができる。
　また、超音波融着のように、融着の際にかすが生じることがないので、遠心ポンプ１の製造に際し、かすを取り除くために遠心ポンプ１を洗浄する工程（洗浄や洗浄後の乾燥等を含む）を行わずに済み、簡単かつ少ない工程で製造することができる。さらに、接着剤による接着や、溶剤による融着に比べ比較的短時間で、かつ、良好に接合を行うことができる。
　また、別途用意された光吸収材２００を用いることにより、レーザ光を吸収させるために底部材２１や蓋部材２２そのものを着色する必要がなく、底部材２１や蓋部材２２を実質的に透明なものとすることができるので、内部の視認性を十分に確保することができる。
　照射するレーザ光Ｌの種類としては、特に限定されず、例えば、半導体レーザ、ＣＯ２レーザ、ＹＡＧレーザ、エキシマレーザ等が挙げられるが、その中でも特に、半導体レーザがエネルギー効率が良く、寿命が長いという理由で好ましい。
　照射するレーザ光Ｌの波長は、概ね、前記レーザ光Ｌの種類に依存するが、半導体レーザの場合、波長は、８００～１０００ｎｍ程度であるのが好ましい。
　レーザ光Ｌのビーム径は、特に限定されないが、重なり部３００の図６中の上下方向の長さと同じかまたは若干大きいのが好ましい。これにより、重なり部３００にレーザ光Ｌを照射しつつ、底部材２１および蓋部材２２を回転させるという簡単な方法により、光吸収材２００の図６中上下方向の全長にわたってレーザ光Ｌを確実に照射することができる。よって、容易に融着を行うことができる。
　また、本実施形態では、融着を行う際、加圧具８２により底部材２１および蓋部材２２をそれらが接近する方向に押圧力Ｐで加圧（押圧）する。これにより、融着強度をより高めることができる。また、このとき、加圧具８２は、下端面８２２で蓋部材２２の天板２２１の縁部、すなわち、側壁２２２の付け根付近を押圧する。これにより、加圧具８２の加圧力（抑え力）は、側壁２２２に効率よく伝達される。よって、押圧による底部材２１と蓋部材２２との位置ズレを防止することができるとともに、底部材２１および蓋部材２２の境界部をハウジング２の全周にわたってできるだけ均一に押圧することができる。
　また、上記のような加圧は、図４に示す加圧前の第１の軸受け６と第２の軸受け７との離間距離Ｄ０に対して、加圧後の第１の軸受け６と第２の軸受け７と離間距離が９８～９９％になる程度であるのが好ましい。このように予め締め付けた状態で融着を行うことにより、融着後の遠心ポンプ１の使用中において、ハウジング２内の内圧が高まり、ハウジング２が回転体３の回転中心方向に押し広げられた場合であっても、軸部材５がハウジング２内で、その軸方向にズレるのを防止することができる。よって、このズレに起因する溶血の発生を確実に防止することができる。
　このように、本発明によれば、底部材２１と蓋部材２２とをレーザ光Ｌの照射により融着するため、従来の接合方法に比べて、底部材２１と蓋部材２２との融着強度（接合強度）を高めることができる。これにより、遠心ポンプ１の使用中に、融着部１００や、その周辺部に応力が集中することにより生じるクラックの発生等を防止または抑制することができる。
　以上、本発明の遠心ポンプの製造方法および遠心ポンプを図示の実施形態について説明したが、本発明は、これに限定されるものではなく、遠心ポンプを構成する各部は、同様の機能を発揮し得る任意の構成のものと置換することができる。また、任意の構成物（工程）が付加されていてもよい。
　なお、前記実施形態では、光吸収材供給工程を行った後に組立工程を行っているが、本発明ではこれに限定されず、組立工程を行った後に光吸収材供給工程を行ってもよい。この場合、底部材と蓋部材との境界部に毛管現象を利用して光吸収材を介在させることができる。
　また、前記実施形態では、光吸収工程において、蓋部材の薄肉部に光吸収材を供給しているが、本発明ではこれに限定されず、底部材の薄肉部に光吸収材を供給してもよく、底部材の薄肉部および蓋部材の薄肉部の双方に光吸収材を供給してもよい。
　また、前記実施形態では、底部材の薄肉部は、蓋部材の薄肉部の外側に位置しているが、本発明ではこれに限定されず、底部材の薄肉部は、蓋部材の薄肉部の内側に位置していてもよい。
　本発明の遠心ポンプの製造方法は、中空体で構成され、その中空部に連通し、血液が流入する血液流入口と、前記中空部に連通し、前記血液流入口から流入した血液が流出する血液流出口とを有するハウジングと、前記中空部内に回転可能に収納され、その回転により血液に遠心力を付与する遠心力付与部材とを備える遠心ポンプを製造する製造方法であって、前記ハウジングは、底部材と蓋部材とを組立てた組立状態で接合されてなるものであり、前記組立状態とする組立工程と、前記組立状態で、前記底部材と前記蓋部材との境界部付近にレーザ光を照射することにより、前記底部材と前記蓋部材との融着を行う融着工程とを有することを特徴とする。そのため、底部材および蓋部材を高い接合強度で、かつ、良好に接合することができる。
１、１'　　　　　遠心ポンプ
２　　　　　　　ハウジング
２０　　　　　　ハウジング本体
２１　　　　　　底部材
２１１　　　　　側壁
２１２　　　　　薄肉部
２１２ａ　　　　内周面
２１３　　　　　厚さ一定部
２２　　　　　　蓋部材
２２１　　　　　天板
２２２　　　　　側壁
２２３　　　　　薄肉部
２２３ａ　　　　外周面
２２３ｂ　　　　端面
２２４　　　　　厚さ一定部
２２４ａ　　　　端面
２２５　　　　　第２の軸受け設置部
２４　　　　　　ポンプ室
２４１　　　　　間隙
２５　　　　　　血液流入ポート
２５１　　　　　屈曲部
２５２　　　　　根元部
２５３　　　　　接続部
２５４　　　　　第１の軸受け設置部
２６　　　　　　血液流出ポート
３　　　　　　　回転体
３１　　　　　　血液流路
３２　　　　　　上面
３３　　　　　　外周面
３４　　　　　　永久磁石
４　　　　　　　支持機構
５　　　　　　　軸部材
６　　　　　　　第１の軸受け
７　　　　　　　第２の軸受け
８　　　　　　　治具
８１　　　　　　保持具
８１１　　　　　凹部
８２　　　　　　加圧具
８２１　　　　　内部空間
８２２　　　　　下端面
１００　　　　　融着部
２００　　　　　光吸収材
３００　　　　　重なり部
Ｄ０　　　　　　離間距離
Ｌ　　　　　　　レーザ光
Ｐ　　　　　　　押圧力
Ｑ　　　　　　　血液

Claims (8)

  1. 　中空体で構成され、その中空部に連通し、血液が流入する血液流入口と、前記中空部に連通し、前記血液流入口から流入した血液が流出する血液流出口とを有するハウジングと、
    　前記中空部内に回転可能に収納され、その回転により血液に遠心力を付与する遠心力付与部材とを備える遠心ポンプを製造する製造方法であって、
    　前記ハウジングは、底部材と蓋部材とを組立てた組立状態で接合されてなるものであり、
    　前記組立状態とする組立工程と、
    　前記組立状態で、前記底部材と前記蓋部材との境界部付近にレーザ光を照射することにより、前記底部材と前記蓋部材との融着を行う融着工程とを有することを特徴とする遠心ポンプの製造方法。
  2. 　前記融着工程では、前記底部材および前記蓋部材を回転させつつ前記レーザ光の照射を行い、全周にわたって前記融着を行う請求項１に記載の遠心ポンプの製造方法。
  3. 　前記レーザ光は、半導体レーザによるものである請求項１または２に記載の遠心ポンプの製造方法。
  4. 　前記底部材は、前記蓋部材に向って突出形成され、前記遠心力付与部材の回転中心軸回りに延在する第１の壁部を有し、
    　前記蓋部材は、前記底部材に向って突出形成され、前記回転中心軸回りに延在する第２の壁部を有し、
    　前記融着工程では、前記第１の壁部および前記第２の壁部のうちの一方の壁部が他方の壁部の外側に位置した状態で、前記一方の壁部の内周面と前記他方の壁部の外周面とを融着する請求項１ないし３のいずれか１項に記載の遠心ポンプの製造方法。
  5. 　前記第１の壁部および前記第２の壁部は、壁厚が薄くなっている薄肉部をそれぞれ有し、
    　前記融着工程では、前記各薄肉部同士を融着する請求項４に記載の遠心ポンプの製造方法。
  6. 　前記底部材および前記蓋部材は、それぞれ光透過性を有するものであり、
    　前記組立工程に先立って、前記一方の壁部の内周面と前記他方の壁部の外周面とのうちの少なくとも一方の面に光吸収材を供給する光吸収材供給工程を有している請求項４または５に記載の遠心ポンプの製造方法。
  7. 　前記光吸収材供給工程では、前記第１の壁部および前記第２の壁部のうちの内側に位置している壁部に前記光吸収材を供給する請求項６に記載の遠心ポンプの製造方法。
  8. 　底部材と蓋部材とを組立てたものであり、血液が流入する血液流入口と、前記血液流入口から流入した血液が流出する血液流出口とを有するハウジングと、
    　前記ハウジング内に回転可能に収納され、その回転により血液に遠心力を付与する遠心力付与部材とを備える遠心ポンプであって、
    　請求項１ないし７のいずれか１項に記載の遠心ポンプの製造方法により製造されることを特徴とする遠心ポンプ。
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