WO1998015303A1 - Ultrasonic welding of felt filter in hardshell reservoir - Google Patents

Ultrasonic welding of felt filter in hardshell reservoir Download PDF

Info

Publication number
WO1998015303A1
WO1998015303A1 PCT/US1997/017865 US9717865W WO9815303A1 WO 1998015303 A1 WO1998015303 A1 WO 1998015303A1 US 9717865 W US9717865 W US 9717865W WO 9815303 A1 WO9815303 A1 WO 9815303A1
Authority
WO
WIPO (PCT)
Prior art keywords
frame
felt
filter
filtering material
horn
Prior art date
Application number
PCT/US1997/017865
Other languages
French (fr)
Inventor
Michael R. Van Driel
Original Assignee
Medtronic, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Medtronic, Inc. filed Critical Medtronic, Inc.
Priority to AU46671/97A priority Critical patent/AU4667197A/en
Priority to EP97945473A priority patent/EP1011750A1/en
Priority to JP10517622A priority patent/JP2001501849A/en
Publication of WO1998015303A1 publication Critical patent/WO1998015303A1/en

Links

Classifications

    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • 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
    • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/36—Other treatment of blood in a by-pass of the natural circulatory system, e.g. temperature adaptation, irradiation ; Extra-corporeal blood circuits
    • A61M1/3621—Extra-corporeal blood circuits
    • A61M1/3627—Degassing devices; Buffer reservoirs; Drip chambers; Blood filters
    • 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
    • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/36—Other treatment of blood in a by-pass of the natural circulatory system, e.g. temperature adaptation, irradiation ; Extra-corporeal blood circuits
    • A61M1/3621—Extra-corporeal blood circuits
    • A61M1/3627—Degassing devices; Buffer reservoirs; Drip chambers; Blood filters
    • A61M1/3632—Combined venous-cardiotomy reservoirs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/111—Making filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13—Supported filter elements
    • B01D29/23—Supported filter elements arranged for outward flow filtration
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/345—Progressively making the joint, e.g. starting from the middle
    • B29C66/3452—Making complete joints by combining partial joints
    • 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
    • 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
    • B29C66/545—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 one hollow-preform being placed inside the other
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • 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
    • B29C66/72—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 structure of the material of the parts to be joined
    • B29C66/727—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 structure of the material of the parts to be joined being porous, e.g. foam
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • 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
    • B29C66/739—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 material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—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 material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—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 material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81421—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave
    • B29C66/81423—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave being concave
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/23—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations
    • B29C66/232—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations said joint lines being multiple and parallel, i.e. the joint being formed by several parallel joint lines
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • 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
    • B29C66/71—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 composition of the plastics material of the parts to be joined
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • 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
    • B29C66/71—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 composition of the plastics material of the parts to be joined
    • B29C66/712—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 composition of the plastics material of the parts to be joined the composition of one of the parts to be joined being different from the composition of the other part
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • 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
    • B29C66/73116—Melting point of different melting point, i.e. the melting point of one of the parts to be joined being different from the melting point of the other part
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81415—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
    • B29C66/81417—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled being V-shaped
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81433—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined being toothed, i.e. comprising several teeth or pins, or being patterned
    • B29C66/81435—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined being toothed, i.e. comprising several teeth or pins, or being patterned comprising several parallel ridges, e.g. for crimping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2313/00—Use of textile products or fabrics as reinforcement
    • 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
    • B29L2031/14—Filters

Definitions

  • This invention relates to a method of manufacturing a cardiotomy filter in a hardshell venous reservoir, and more particularly to a method in which the filter material is ultrasonically welded to the filter frame.
  • Cardiotomy blood filter/defoamer structures used in hardshell venous reservoirs conventionally include a rigid apertured cylindrical frame which supports defoaming layers and a filter layer. These layers defoam and filter the cardiotomy blood as it passes through them.
  • the filter layer is typically formed from a polyester felt or screen. It is typically placed around the outer circumference of the frame and is secured to the frame in sealing relationship by using nylon tie straps and silicon glue or urethane potting.
  • tie straps are typically washed in water after manufacture, and thereby acquire a substantial amount of pyrogens. Sterilization removes most of these pyrogens but low levels survive sterilization. If the pyrogen level in the straps was high initially, this may result in an unacceptable level of pyrogens in the filter/defoamer after sterilization. Extensive and costly rework and lot evaluation is then needed to determine if the manufacturing lot is usable or not. Also, current manufacturing methods are prone to cause worker ergonomic issues resulting from the repetitive movements involved in tie strap assembly.
  • the present invention achieves the objective of sealingly bonding the filter to the frame without bondants or tie straps, by ultrasonically welding the polyester filter material to a thermoplastic (e.g. polystyrene) frame while applying mechanical pressure thereto.
  • a thermoplastic e.g. polystyrene
  • Fig. 1 is a vertical section of a hardshell venous resrvoir in which the invention is used;
  • Fig. 2 is a vertical section of the cardiotomy frame and depth filter
  • Fig. 3 is a plan view of the frame and filter of Fig. 2 showing the ultrasonic horn
  • Fig. 4 is a detail side elevation as indicated by 4 in Fig. 3; and Fig. 5 is a schematic diagram illustrating the ultrasonic welding system. Description of the preferred embodiment Fig. 1 shows the environment of the invention.
  • a blood processing unit 12 which includes a cardiotomy filter/defoamer section 14 and a venous microair defoamer section 16.
  • cardiotomy blood is introduced into the cardiotomy chamber 18 and flows from there into the reservoir 20 through the filter/defoamer assembly 22.
  • the assembly 22 typically consists of an inner defoaming layer 24 of porous defoaming-chemical impregnated polyurethane foam; a rigid thermoplastic supporting frame 26; a polyester felt or screen filter 28 for filtering out bone chips, blood clots, flesh particulates or sutures suctioned out of the surgery field; a secondary defoaming layer 30 of porous defoaming-chemical impregnated polyurethane foam; and a secondary filtering and flow-retarding tricot sock 32.
  • the thickness of the filter 28 may typically range from about 0.65 mm to 6.5 mm.
  • the filter 28 must be sealingly attached to the frame 26 along its top and bottom circumference 34, 36 (Fig. 2).
  • the invention in its preferred embodiment uses a titanium ultrasonic horn 38 (Fig. 3) which is vibrated by a hydraulic ultrasonic vibrator 39 (Fig. 5) at a frequency of about 15-25 kHz.
  • the face of the horn 38 takes the form of several parallel ridges 40 which, when the horn 38 is pressed against the felt layer 28 and frame 26, anchor the felt material into the frame material (Fig. 4).
  • the ultrasonic vibrator 39 cyclically presses the horn 38 against the filter material 28 and frame 26 at the vibration frequency with a weld pressure.
  • the horn 38 is also pressed against the filter material 28 and frame 26 with a higher steady-state hold pressure by the holding device 41.
  • a 3.5 mm thick polyester felt 28 was welded to a polystyrene frame 26 with a 20 kHz horn 38 encompassing slightly more than 120° of the circumference of the weld.
  • a weld pressure of 40 ⁇ 10 PSIG was applied to the horn 38 for 0.42 ⁇ 0.1 seconds while the horn was pressed against the felt 28, backed by the frame 26 at a hold pressure of 45 ⁇ 10 PSIG for 0.36 ⁇ 0.1 seconds.
  • the longer duration of the weld pressure assured the presence of weld pressure during the entire holding time.
  • the workpiece was then rotated 120°, and the above sequence was repeated twice more to complete the weld along the entire 360° circumference of the workpiece.
  • the above-described welding method not only eliminates a major source of pyrogens in the manufacture of hardshell venous reservoirs, but also reduces ergonomic problems in the assembly of the reservoirs. It also meaningfully reduces the cost of the product by eliminating the straps and glue, and by reducing the assembly time.

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Hematology (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Cardiology (AREA)
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  • Lining Or Joining Of Plastics Or The Like (AREA)
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Abstract

A polyester felt depth filter is attached to a rigid thermoplastic support frame in a cardiotomy filter/defoamer without the use of tie straps or bondants by ultrasonically welding the felt to the frame.

Description

ULTRASONIC WELDING OF FELT FILTER IN HARDSHELL RESERVOIR
Field of the invention This invention relates to a method of manufacturing a cardiotomy filter in a hardshell venous reservoir, and more particularly to a method in which the filter material is ultrasonically welded to the filter frame. Background of the invention
Cardiotomy blood filter/defoamer structures used in hardshell venous reservoirs conventionally include a rigid apertured cylindrical frame which supports defoaming layers and a filter layer. These layers defoam and filter the cardiotomy blood as it passes through them.
The filter layer is typically formed from a polyester felt or screen. It is typically placed around the outer circumference of the frame and is secured to the frame in sealing relationship by using nylon tie straps and silicon glue or urethane potting.
The use of silicon glue or other bondants, alone or in conjunction with tie straps, presents manufacturing problems that can be quite severe. For example, tie straps are typically washed in water after manufacture, and thereby acquire a substantial amount of pyrogens. Sterilization removes most of these pyrogens but low levels survive sterilization. If the pyrogen level in the straps was high initially, this may result in an unacceptable level of pyrogens in the filter/defoamer after sterilization. Extensive and costly rework and lot evaluation is then needed to determine if the manufacturing lot is usable or not. Also, current manufacturing methods are prone to cause worker ergonomic issues resulting from the repetitive movements involved in tie strap assembly.
It is therefore desirable to secure the filter to the frame without the use of bondants or tie straps. Until the present invention, however, it was considered unfeasible to secure the polyester medium to the frame by a welding process because of the different melting points of the two materials. Summary of the invention
The present invention achieves the objective of sealingly bonding the filter to the frame without bondants or tie straps, by ultrasonically welding the polyester filter material to a thermoplastic (e.g. polystyrene) frame while applying mechanical pressure thereto.
Brief description of the drawings
Fig. 1 is a vertical section of a hardshell venous resrvoir in which the invention is used;
Fig. 2 is a vertical section of the cardiotomy frame and depth filter; Fig. 3 is a plan view of the frame and filter of Fig. 2 showing the ultrasonic horn, and
Fig. 4 is a detail side elevation as indicated by 4 in Fig. 3; and Fig. 5 is a schematic diagram illustrating the ultrasonic welding system. Description of the preferred embodiment Fig. 1 shows the environment of the invention. A hardshell venous reservoir
10 contains a blood processing unit 12 which includes a cardiotomy filter/defoamer section 14 and a venous microair defoamer section 16. In the cardiotomy section 14, cardiotomy blood is introduced into the cardiotomy chamber 18 and flows from there into the reservoir 20 through the filter/defoamer assembly 22. The assembly 22 typically consists of an inner defoaming layer 24 of porous defoaming-chemical impregnated polyurethane foam; a rigid thermoplastic supporting frame 26; a polyester felt or screen filter 28 for filtering out bone chips, blood clots, flesh particulates or sutures suctioned out of the surgery field; a secondary defoaming layer 30 of porous defoaming-chemical impregnated polyurethane foam; and a secondary filtering and flow-retarding tricot sock 32. The thickness of the filter 28 may typically range from about 0.65 mm to 6.5 mm.
Because it is essential that no solid matter in the cardiotomy blood be able to circumvent the depth filter 28, the filter 28 must be sealingly attached to the frame 26 along its top and bottom circumference 34, 36 (Fig. 2). To achieve this without the use of bondants or tie straps, the invention in its preferred embodiment uses a titanium ultrasonic horn 38 (Fig. 3) which is vibrated by a hydraulic ultrasonic vibrator 39 (Fig. 5) at a frequency of about 15-25 kHz. The face of the horn 38 takes the form of several parallel ridges 40 which, when the horn 38 is pressed against the felt layer 28 and frame 26, anchor the felt material into the frame material (Fig. 4).
The vibrating action of the horn 38 under pressure against the workpiece heats and partially melts the polyester felt or screen 28 and the thermoplastic frame 26. As schematically indicated in Fig. 5, the ultrasonic vibrator 39 cyclically presses the horn 38 against the filter material 28 and frame 26 at the vibration frequency with a weld pressure. At the same time, the horn 38 is also pressed against the filter material 28 and frame 26 with a higher steady-state hold pressure by the holding device 41.
In a representative practical embodiment of the invention, a 3.5 mm thick polyester felt 28 was welded to a polystyrene frame 26 with a 20 kHz horn 38 encompassing slightly more than 120° of the circumference of the weld. A weld pressure of 40 ± 10 PSIG was applied to the horn 38 for 0.42 ± 0.1 seconds while the horn was pressed against the felt 28, backed by the frame 26 at a hold pressure of 45 ± 10 PSIG for 0.36 ± 0.1 seconds. The longer duration of the weld pressure assured the presence of weld pressure during the entire holding time. The workpiece was then rotated 120°, and the above sequence was repeated twice more to complete the weld along the entire 360° circumference of the workpiece.
The above-described welding method not only eliminates a major source of pyrogens in the manufacture of hardshell venous reservoirs, but also reduces ergonomic problems in the assembly of the reservoirs. It also meaningfully reduces the cost of the product by eliminating the straps and glue, and by reducing the assembly time.
It is understood that the exemplary ultrasonic welding of polyester filter in hardshell reservoir described herein and shown in the drawings represents only a presently preferred embodiment of the invention. Indeed, various modifications and additions may be made to such embodiment without departing from the spirit and scope of the invention. Thus, other modifications and additions may be obvious to those skilled in the art and may be implemented to adapt the present invention for use in a variety of different applications.

Claims

What is claimed is:
1. A method of sealingly mounting a felt depth filter on a thermoplastic support frame in a cardiotomy filter, comprising the steps of: a) providing a rigid substantially cylindrical thermoplastic frame; b) positioning a layer of biocompatible plastic filtering material around the circumference of said frame; and c) ultrasonically welding said plastic material and frame by heating them while pressing them together.
2. The method of Claim 1 , in which said filtering material is polyester and said frame is made of polystyrene.
3. The method of Claim 2, in which said filtering material is a screen.
4. The method of Claim 2, in which said filtering material is felt.
5. The method of Claim 1, in which said felt and frame are welded along the top and bottom circumference of said frame.
6. The method of Claim 1 , in which said welding step is performed by an ultrasonic horn subjected to ultrasonic vibrations while being pressed against said felt.
7. The method of Claim 6, in which said felt is pressed into said frame by ridges formed on said horn.
8. The method of Claim 1, in which said welding step includes the steps of applying said horn to said filtering material while ultrasonically vibrating it for substantially 0.42 ± 0.1 seconds at a weld pressure of substantially 40 ± 10 PSIG while holding it against said felt filtering material for substantially 0.36 ± 0.1 seconds at a higher pressure.
9. The method of Claim 8, in which said higher pressure is substantially 45 ± 10 PSIG.
10. The method of Claim 8, in which said ultrasonic vibration has a frequency of substantially 15-25 kHz.
PCT/US1997/017865 1996-10-10 1997-10-02 Ultrasonic welding of felt filter in hardshell reservoir WO1998015303A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU46671/97A AU4667197A (en) 1996-10-10 1997-10-02 Ultrasonic welding of felt filter in hardshell reservoir
EP97945473A EP1011750A1 (en) 1996-10-10 1997-10-02 Ultrasonic welding of felt filter in hardshell reservoir
JP10517622A JP2001501849A (en) 1996-10-10 1997-10-02 Ultrasonic welding of felt filter in hard shell reservoir

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US72887596A 1996-10-10 1996-10-10
US08/728,875 1996-10-10

Publications (1)

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WO1998015303A1 true WO1998015303A1 (en) 1998-04-16

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JP (1) JP2001501849A (en)
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999020325A1 (en) * 1997-10-22 1999-04-29 Medtronic, Inc. Ultrasonic bonding of a felt filter to a frame in a hardshell reservoir
WO2000069618A1 (en) * 1999-05-14 2000-11-23 Cobe Cardiovascular, Inc. Method of assembly of cardiotomy filter
WO2002049738A1 (en) * 2000-12-21 2002-06-27 Filterwerk Mann + Hummel Gmbh Filter element

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016203397A (en) * 2015-04-15 2016-12-08 東邦テナックス株式会社 Method for producing prepreg

Citations (4)

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Publication number Priority date Publication date Assignee Title
US3879292A (en) * 1972-03-20 1975-04-22 Clecon Inc Desiccant device
EP0219053A2 (en) * 1985-10-07 1987-04-22 BAXTER INTERNATIONAL INC. (a Delaware corporation) Blood filtration devices with heparin coated filter elements
EP0478914A1 (en) * 1990-07-27 1992-04-08 Pall Corporation Leucocyte depleting filter device and method of use
EP0676213A2 (en) * 1994-02-15 1995-10-11 Level 1 Technologies Vortex gas elimination device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3879292A (en) * 1972-03-20 1975-04-22 Clecon Inc Desiccant device
EP0219053A2 (en) * 1985-10-07 1987-04-22 BAXTER INTERNATIONAL INC. (a Delaware corporation) Blood filtration devices with heparin coated filter elements
EP0478914A1 (en) * 1990-07-27 1992-04-08 Pall Corporation Leucocyte depleting filter device and method of use
EP0676213A2 (en) * 1994-02-15 1995-10-11 Level 1 Technologies Vortex gas elimination device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999020325A1 (en) * 1997-10-22 1999-04-29 Medtronic, Inc. Ultrasonic bonding of a felt filter to a frame in a hardshell reservoir
WO2000069618A1 (en) * 1999-05-14 2000-11-23 Cobe Cardiovascular, Inc. Method of assembly of cardiotomy filter
WO2002049738A1 (en) * 2000-12-21 2002-06-27 Filterwerk Mann + Hummel Gmbh Filter element
US7059481B2 (en) 2000-12-21 2006-06-13 Mann & Hummel Gmbh Filter element

Also Published As

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JP2001501849A (en) 2001-02-13
EP1011750A1 (en) 2000-06-28
AU4667197A (en) 1998-05-05

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