WO1999020325A1 - Ultrasonic bonding of a felt filter to a frame in a hardshell reservoir - Google Patents
Ultrasonic bonding of a felt filter to a frame in a hardshell reservoir Download PDFInfo
- Publication number
- WO1999020325A1 WO1999020325A1 PCT/US1998/021867 US9821867W WO9920325A1 WO 1999020325 A1 WO1999020325 A1 WO 1999020325A1 US 9821867 W US9821867 W US 9821867W WO 9920325 A1 WO9920325 A1 WO 9920325A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- frame
- felt
- filtering material
- filter
- horn
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- 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
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 a fibrous filter material is ultrasonically embedded in 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 manufactured 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 embedding the polyester filter material in a softened thermoplastic energy and mechanical pressure to the felt and frame.
- Fig. 1 is a vertical section of a hardshell venous reservoir in which the invention is used;
- Fig. 2 is a vertical section of the cardiotomy frame end 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 in Fig. 3
- Fig. 5, is a schematic diagram illustrating the ultrasonic embedding system.
- 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.
- cardiotomy blood is introduced into the cardiotomy chamber
- the assembly 22 typically consists of an inner defoaming layer 24 of porous defoaming-chemical impregnated polyurethane foam; a rigid thermoplastic polystyrene supporting frame 26 with a melting point of 80° C; a woven 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, and its polyester material may preferably have a melting point of about 200° C.
- the filter 28 must be sealingly attached to the frame 26 along its top and bottom circumference 34, 36 (Fig. 2).
- the invention in it 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 j ⁇ .
- 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 while being ultrasonically vibrated, push the fibers of the felt material into the softened surface of the frame 26 (Fig. 4).
- the vibrating action of the horn 38 under pressure against the workpiece is preferably so adjusted as to heat and partially melt the surface thermoplastic frame
- the ultrasonic vibrator 39 cyclically presses the horn 38 against the filter material 28 and frame 26 at the vibration frequency with a vibration 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 holding device 41.
- a 3.5 rnm thick polyester felt 28 was embedded into a polystyrene frame 26 with a 20 kHz horn 38 encompassing slightly more than 120° of the circumference of the frame.
- a vibration 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 frame 26, at a steady-state pressure of 45 _+ 10 PSIG for 0.36 _+ 0.1 seconds.
- the longer duration of the vibration pressure assured the presence of vibration 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 ultrasonic heat-bonding 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.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98953600A EP1053034A1 (en) | 1997-10-22 | 1998-10-15 | Ultrasonic bonding of a felt filter to a frame in a hardshell reservoir |
AU10932/99A AU1093299A (en) | 1997-10-22 | 1998-10-15 | Ultrasonic bonding of a felt filter to a frame in a hardshell reservoir |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US95560597A | 1997-10-22 | 1997-10-22 | |
US08/955,605 | 1997-10-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999020325A1 true WO1999020325A1 (en) | 1999-04-29 |
Family
ID=25497069
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1998/021867 WO1999020325A1 (en) | 1997-10-22 | 1998-10-15 | Ultrasonic bonding of a felt filter to a frame in a hardshell reservoir |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1053034A1 (en) |
AU (1) | AU1093299A (en) |
WO (1) | WO1999020325A1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3879292A (en) * | 1972-03-20 | 1975-04-22 | Clecon Inc | Desiccant device |
US4014797A (en) * | 1973-12-11 | 1977-03-29 | Burron Medical Products, Inc. | Intravenous injection apparatus and needle adapter with filter and method of making same |
US5011555A (en) * | 1989-09-15 | 1991-04-30 | Branson Ultrasonics Corporation | Method of ultrasonically cutting and sealing thermoplastic workpieces particularly a filter |
EP0676213A2 (en) * | 1994-02-15 | 1995-10-11 | Level 1 Technologies | Vortex gas elimination device |
WO1996033791A1 (en) * | 1995-04-27 | 1996-10-31 | Avecor Cardiovascular Inc. | Method of manufacturing a fluid filter |
WO1998015303A1 (en) * | 1996-10-10 | 1998-04-16 | Medtronic, Inc. | Ultrasonic welding of felt filter in hardshell reservoir |
-
1998
- 1998-10-15 WO PCT/US1998/021867 patent/WO1999020325A1/en not_active Application Discontinuation
- 1998-10-15 AU AU10932/99A patent/AU1093299A/en not_active Abandoned
- 1998-10-15 EP EP98953600A patent/EP1053034A1/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3879292A (en) * | 1972-03-20 | 1975-04-22 | Clecon Inc | Desiccant device |
US4014797A (en) * | 1973-12-11 | 1977-03-29 | Burron Medical Products, Inc. | Intravenous injection apparatus and needle adapter with filter and method of making same |
US5011555A (en) * | 1989-09-15 | 1991-04-30 | Branson Ultrasonics Corporation | Method of ultrasonically cutting and sealing thermoplastic workpieces particularly a filter |
EP0676213A2 (en) * | 1994-02-15 | 1995-10-11 | Level 1 Technologies | Vortex gas elimination device |
WO1996033791A1 (en) * | 1995-04-27 | 1996-10-31 | Avecor Cardiovascular Inc. | Method of manufacturing a fluid filter |
WO1998015303A1 (en) * | 1996-10-10 | 1998-04-16 | Medtronic, Inc. | Ultrasonic welding of felt filter in hardshell reservoir |
Also Published As
Publication number | Publication date |
---|---|
EP1053034A1 (en) | 2000-11-22 |
AU1093299A (en) | 1999-05-10 |
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