US3853130A - Sterile handling catheter assemblies - Google Patents

Sterile handling catheter assemblies Download PDF

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Publication number
US3853130A
US3853130A US00421726A US42172673A US3853130A US 3853130 A US3853130 A US 3853130A US 00421726 A US00421726 A US 00421726A US 42172673 A US42172673 A US 42172673A US 3853130 A US3853130 A US 3853130A
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US
United States
Prior art keywords
catheter
sheath
slit
catheter assembly
assembly
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US00421726A
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English (en)
Inventor
D Sheridan
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Mallinckrodt Inc
Malco Inc
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Individual
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Priority to US00421726A priority Critical patent/US3853130A/en
Priority to CA202,893A priority patent/CA1037811A/fr
Priority to BE146013A priority patent/BE817015A/fr
Priority to DE19742434192 priority patent/DE2434192C3/de
Priority to GB4349474A priority patent/GB1477645A/en
Priority to JP13008474A priority patent/JPS5330955B2/ja
Priority to FR7439530A priority patent/FR2252854B1/fr
Application granted granted Critical
Publication of US3853130A publication Critical patent/US3853130A/en
Assigned to MALLINCKRODT, INC. reassignment MALLINCKRODT, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: MALCO, INC.
Assigned to MALCO, INC., ST. LOUIS, MISSOURI A CORP. OF DE. reassignment MALCO, INC., ST. LOUIS, MISSOURI A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MALLINCKRODT, INC.
Assigned to MALLINCKRODT MEDICAL, INC., A DE CORP. reassignment MALLINCKRODT MEDICAL, INC., A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MALLINCKRODT, INC., A CORP. OF DE
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • A61M25/00—Catheters; Hollow probes
    • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
    • A61M25/0105—Steering means as part of the catheter or advancing means; Markers for positioning
    • A61M25/013—One-way gripping collars
    • 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
    • A61M25/00—Catheters; Hollow probes
    • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
    • A61M25/0105—Steering means as part of the catheter or advancing means; Markers for positioning
    • A61M25/0111—Aseptic insertion devices
    • 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
    • A61M25/00—Catheters; Hollow probes
    • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
    • A61M25/09—Guide wires
    • A61M2025/09116—Design of handles or shafts or gripping surfaces thereof for manipulating guide wires
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S128/00—Surgery
    • Y10S128/26—Cannula supporters

Definitions

  • a Sterile handling Catheter assembly wmprises a cath- [58] Field of Search 128/348, 349 R, 350 R, eter enveloped y a Protective Sheath which has 8 128/351 1 R, 303 R DIG 2 gitudinal slit extending the entire length thereof and a pair of ribs extending radially from the sheath which [56] References Cited run the full length of the sheath adjacent and parallel UNITED STATES PATENTS I to the slit creating a barrier which preserves sterility of the edges of the slit during manipulation of the assem- 5273 bly for installation of the catheter in a patient.
  • Catheter assemblies of the invention are especially useful for sterile handling of suction catheters but the new assemblies may be utilized with urethral catheters, Foley catheters or any other form of tubes or catheters known to the surgical and medical arts which require sterile handling for installation in a patient.
  • a principal object of this invention is the provision of new forms of sterile handling catheter assemblies. Further objects include the provision of:
  • Sterile handling catheter assemblies in which the catheter is carried in a protective sheath of unique construction which permits the sheath to be used as a means by which the catheter is advanced for installation in a patient.
  • sterile handling catheter assemblies which comprise a catheter, and a pro.- tective sheath formed of flexible plastic material enveloping at least the proximal end and central body portions of the catheter.
  • the protective sheath has a longitudinal slit extending the entire length thereof, a pair of ribs extend radially from the sheath and run the full length thereof adjacent and parallel to the slit. These ribs serve as barrier members above the slit to preserve the sterility of the edges of the slit while the protective sheath is manipulated by a surgeon or other person and used as the means to advance the catheter for its installation in a patient.
  • the sheath is shorter in length than the catheter so that the distal end portion of the catheter remains uncovered by the sheath. In another embodiment, the sheath is longer than the catheter so that even the distal end portion is covered and the sheath extends beyond the distal end, e.g., about 1-3 cm.
  • both the catheter and the protective sheath are formed by extrusion from flexible waterproof non-fibrous thermoplastic. material.
  • the ribs which constitute the barrier members for the slit are formed integrally with the remainder of the protective sheath.
  • the longitudinal slit in the sheath can be formed by cutting, it is advanta- BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 5 is an enlarged sectional end view of a catheter assembly of the invention.
  • FIG. 6 is an enlarged sectional end view of the catheter assembly of FIG. 5 showing the protective sheath being strippped from the catheter as the catheter is inserted into a patient.
  • FIG. v7 is an enlarged sectional end view of another form of catheter assembly of the invention.
  • FIG. 8 is an enlarged fragmentary plan view of a catheter assembly of the invention.
  • FIG. 9 is a fragmented perspective view of another form of suction catheter assembly of the invention.
  • FIG. 10 is a fragmented perspective view of the catheter assembly of FIG. 9 at the beginning of the manipulation to install the catheter in a patient.
  • FIG. 11 is a fragmented perspective view of the catheter assembly of FIG. 9 in a further stage of manipulation prior to installation.
  • a catheter assembly of the invention 2 comprises a catheter 4 and a protective sheath 6.
  • the catheter has a distal end portion 8, a proximal end portion 10 and a central body portion 12 which connects the distal end portion 8 to the proximal end portion 10.
  • the protectivesheath 6 formed of flexible plastic material is shorter in length than the catheter 4 so that the distal end 14 of the sheath terminates proximally of the tip 16 of the catheter leaving the distal end portion 8 of the catheter uncovered.
  • the remainder of the catheter comprising the central body and proximal end portions is enveloped by the protective sheath.
  • the sheath 6 has a longitudinal slit 18 which extends the entire length of the sheath.
  • a first rib 20 runs the .full length of the sheath adjacent one side of the slit and, as can be seen in detail in FIG. 5, the rib 20 extends radially outwardly from the sheath 6.
  • a second rib 22 which also runs the full length of the sheath adjacent the other side of the slit 18 extends radially outwardly from the sheath 6 substantially the same distance as the first rib 20.
  • the ribs 20 and 22 create a pair of parallel barrier members above the slit l8 preventing objects, such as the finger 24 of a surgeon, from contacting the edges of the slit during manipulation of the catheter assembly in installation of the catheter in a patient.
  • the pair of ribs 20 and 22 preserve the sterility of the slit edges 26 and 28 and thereby insure the sterility of the catheter when these edges contact the catheter as the protective sheath 6 is stripped from the catheter 4 during insertion of the catheter in a patient (see FIGS. 2 and 6).
  • FIGS. 1 and 2 illustrate the installation of a suction catheter into a patient by way of a tracheostomy tube 30.
  • the protective sheath 6 of the suction catheter assembly 2 is grasped between the thumb 36 and index'finger 38 of j a short distance further along the protective sheath away from the junction between the catheter 4 and the parting in the sheath 6 and gently pushes the catheter assembly toward the patient so that a further section of the catheter enters the tracheostomy tube 30.
  • FIG. 4' Details of construction of the proximal end portion of the catheter assembly illustrated at FIG. 1 are shown in FIG. 4'.
  • the vacuum controller 40 which may be of the form shown and described in U.S. Pat. No. 3,610,242 or of any other suitable structure, is joined to the proximal end 10 of the catheter by a short section of tubing 42 which is cemented at one end to the inlet port 44 of the vacuum controller 40.
  • the tube section 42 has an inside diameter approximately the same size as the outside diameter of the catheter and the proximal end of the catheter is inserted in the tube section 42 and cemented therein.
  • the assembly 60 comprises a catheter 62, a protective sheath 64 and the vacuum controller 66.
  • the sheath 64 is longer than the catheter 62 so that the free end 68 of the sheath extends about I to 3 cm. beyond the distal end 70 of the catheter.
  • the sheath 64 has a longitudinal slit 72 extending the full length thereof and adjacent ribs 74 and 76 as in the case of the embodiments described in connection with FIGS. 1-8.
  • FIG. 9 The use of a catheter assembly as shown in FIG. 9 begins as a two-hand operation.
  • the free-end 68 of the sheath 64 with the slit 72 on top is grasped by the surgeon or other operator between thumb 78 and finger 80.
  • the sheath 64 is grasped near the catheter tip 70 in the other hand between thumb 82 and finger 84.
  • the finger 86 acting as a support below the catheter tip 70 the sheath end 68 is moved downward by thumb 78 and finger 80. This motion will bend the sheath over the tip 70 of the catheter and the slit 72 will open leaving the catheter tip 70 exposed as shown in FIG. 11.
  • the installation of the catheter 62 into the patient will be essentially a one-hand procedure as described previously in connection with the embodiment of FIGS. l-8.
  • each size of catheter will have a protective sheath of the most advantageous size for the particular size catheter with which it will be assembled.
  • the catheter sheath will be just slightly larger in inside diameter than the outside diameter of the catheter, e.g., the ID of the protective sheath 6 will be about 0.1 to 1 mm. larger than the OD. of the catheter 4.
  • the wall thickness of the plastic sheath will depend, in part, upon the nature and type of material of which the plastic sheath is formed. Thus, with more rigid material, a thinner wall thickness for the sheath 6 is preferred.
  • the sheath can be formed of any suitable flexible material including polyolefins, e.g., polyethylene or polypropylene; nylon; acrylic resins; etc., although polyvinyl chloride is preferred because this class material offers a wide range of selection and control in flexibility and strength properties making it possible to construct catheter assemblies of a wide range of sizes and shapes from a single type of material.
  • the wall thickness of the plastic sheath advantageously will be between about 0.2 to 1 mm.
  • the ribs 20 and 22 which extend radially from the tubular cross-section of the plastic sheath may be varied in configuration.
  • a preferred shape is triangular with the base formed integral with the shape per se and a rounded apex. Other shapes, however, are possible including semi-circular, rectangular, square crosssections or the like.
  • the ribs will protrude between about 0.5 and 5 mm. and particularly 1 to 3 mm. above the outer surface of the protective sheath and the distance between the central axes of the ribs will be between about 2 to mm. and particularly 3 to 5 mm.
  • plastic sheaths for the catheter assemblies of the invention When plastic sheaths for the catheter assemblies of the invention are constructed and sized as described above, they will be relatively free to slide longitudinally along the catheters which are enclosed within the sheath. It is preferable, therefore, to arrange some means at the proximal end of the sheath to restrain the sheath from sliding along the catheter. This can be done in a variety of ways. For example, the sheath may be cemented or clamped at its proximal end about the encircled catheter. However, the surgeon or other user of the device may wish to completely separate the sheath from the catheter upon completion of the insertion procedure. Accordingly, a sheath restraining arrangement which does not permanently connect the sheath to the catheter is advantageous. An arrangement of this type is illustrated in FIG. 4.
  • the section of connector tubing 42 is of slightly larger outside diameter than the inside diameter of the sheath 6. Accordingly, when the proximal end 46 of the sheath surrounds the connector tube section 42 there will be sufficient frictional engagement between these two parts 42 and 46 to restrain movement of the sheath 6 along the catheter 4.
  • the catheter assemblies of the invention may be provided with a movable slide 48 which can be used for encasing the used catheter within the protective sheath as it is withdrawn.
  • the slide member 48 would be moved distally on the sheath to this point.
  • the slide 48 may be moved towards the distal end of the assembly using a back and forth twisting motion. This forces the catheter back within the sheath as the catheter is simultaneously extracted from the patient.
  • the slide member 48 is a short section of tubing, e.g., extruded plastic tubing,,having an ID. just slightly larger than the CD. of the sheath 6.
  • the two edges 26 and 28 of the slit l8 abut one another.
  • An alternative arrangement is shown in FIG. 7.
  • one edge 50 of the slit overlaps the other edge 52.
  • a construction of this type for the sheath 6a can easilybe obtained in forming the protective sheath by plastic extrusion by shaping the extrusion die to create a thin lip or ledge on the edge 52 which will underlay the opposing edge 50 of the slit 18a.
  • the catheter which comprises the assemblies of the invention may be manufactured to professional specifications and may be produced in varying degrees of flex ibility or rigidity by varying the formulation of the plastic material from which the tubes are extruded. They should be water-proof, flexible over a relatively wide range of temperatures, resistant to attack by body fluids, capable of being sterilized, such as exposure to ethylene oxide or gamma radiation, and preferably produced by extrusion at high speed in order to be relatively low in cost. There are a variety of plastic materials capable of providing these requirements for the production of catheter assemblies of the invention.
  • both the catheters and the protective sheaths will be formed of non-fibrous plastic material and plasticized polyvinyl chloride is preferred.
  • a particular useful material of this type can be formulated to have an extrusion temperature of about 3253 75F.
  • a particular useful material of this type can be formulated to have an extrusion temperature of about 3253 75F.
  • the invention is contemplated for use in connection with any plastic or elastomeric material known or found to be useful in the formation of disposable catheters, e.g., polyethylene, polypropylene, natural rubber,
  • the catheters of the new assemblies may be constructed with any special features which are known to be useful with medico-surgical tubes or which may be required for particular procedures in which the catheters are to be employed. These may include a nonsparking feature (see U.S. Pat. No. 3,007,132), x-ray markings (see U.S. Pat. No. 3,605,750) or a frosted surface to reduce friction in contact with other plastic aging material is available for such purposes in which the new catheter assemblies may be contained for extended periods of time in sterile condition immediately available to the surgeon or other user at the location where the catheter is to be used with a patient. Once enclosed in such package, the catheter assembly may be rendered sterile by the use of known sterilization methods, e.g., exposure to ethylene oxide or gamma radiation.
  • sterilization methods e.g., exposure to ethylene oxide or gamma radiation.
  • the invention as described herein provides a means for removing a catheter from a sterile peel-back package and preserving the sterility of the catheter while it is being inserted into a patient, such as through the nose, mouth, urethra, an endotracheal tube,'a tracheostomy tube, a body incision or the like. This is accomplished without the person making the catheter installation needing to wear sterile gloves.
  • the catheter is introduced into a patient, the distal portion of the catheter, which extends out of the unique protective sheath, is entered into the orifice through which the catheter is to pass. With only one hand, the surgeon or the protective sheath to advance the catheter into required position in the patient.
  • the protective sheath being of such construction that complete sterility of the catheter is maintained during such manipulation, moves out of the way as the catheter is advanced and creates no discomfort or trauma to the patient.
  • the invention provides new sterile handling catheter assemblies of a single-use, disposable type which can be utilized with maximum efficiency in any required surgical or other medical procedure.
  • a sterile handling catheter assembly comprising:
  • a catheter having a distal end portion, a proximal end portion and a central body portion integrally connecting the distal end portion to the proximal end portion,
  • a protective sheath formed of flexible plastic material that, throughout the length thereof, substantially completely and closely encircles said catheter, the length of said sheath being sufficient that at least the proximal end and central body portions of said catheter are so encircled,
  • said sheath having a longitudinal slit extending substantially the length thereof
  • a first rib running substantially the length of said sheath adjacent one side of said slit extending radially outwardly from said sheath
  • a second rib running substantially the length of said sheath adjacent the other side of said slit extending radially outwardly from said sheath substantially the same distance as said first rib
  • said ribs creating a pair of parallel barrier members above said slit to preserve the sterility of the edges of the slit during manipulation of said assembly in the installation of said catheter in a patient.
  • moveable slide means encircles a portion of the proximal end of said protective sheath.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biophysics (AREA)
  • Pulmonology (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Media Introduction/Drainage Providing Device (AREA)
  • External Artificial Organs (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
US00421726A 1973-12-04 1973-12-04 Sterile handling catheter assemblies Expired - Lifetime US3853130A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US00421726A US3853130A (en) 1973-12-04 1973-12-04 Sterile handling catheter assemblies
CA202,893A CA1037811A (fr) 1973-12-04 1974-06-18 Montage sterile pour la manipulation aseptique des catheters
BE146013A BE817015A (fr) 1973-12-04 1974-06-28 Assemblage de catheters pour manipulation sterile
DE19742434192 DE2434192C3 (de) 1973-12-04 1974-07-16 Vorrichtung zum sterilen Einführen eines Katheters, insbesondere Saugkatheters
GB4349474A GB1477645A (en) 1973-12-04 1974-10-08 Sterile handling catheter assemblies
JP13008474A JPS5330955B2 (fr) 1973-12-04 1974-11-13
FR7439530A FR2252854B1 (fr) 1973-12-04 1974-12-03

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US00421726A US3853130A (en) 1973-12-04 1973-12-04 Sterile handling catheter assemblies

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US3853130A true US3853130A (en) 1974-12-10

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US00421726A Expired - Lifetime US3853130A (en) 1973-12-04 1973-12-04 Sterile handling catheter assemblies

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US (1) US3853130A (fr)
JP (1) JPS5330955B2 (fr)
BE (1) BE817015A (fr)
CA (1) CA1037811A (fr)
FR (1) FR2252854B1 (fr)
GB (1) GB1477645A (fr)

Cited By (63)

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US4082094A (en) * 1976-09-13 1978-04-04 Dailey Calvin L Locking device for intravenous insert
US4175564A (en) * 1978-03-13 1979-11-27 Kwak In S Nasal gastric tube insertion guide and method
US4392853A (en) * 1981-03-16 1983-07-12 Rudolph Muto Sterile assembly for protecting and fastening an indwelling device
EP0098688A1 (fr) * 1982-06-03 1984-01-18 Brian A. Mullaney Distributeur de médicaments intratubulaire
US4687470A (en) * 1985-12-16 1987-08-18 Sherwood Medical Company Catheter for nasogastric intubation
WO1988003422A1 (fr) * 1986-11-14 1988-05-19 Millar Instruments, Inc. Appareil permettant d'introduire des catheters multiples
EP0282143A1 (fr) * 1987-02-27 1988-09-14 C.R. Bard, Inc. Système d'échange de cathéter et fil de guidage
US4776846A (en) * 1987-02-06 1988-10-11 Becton, Dickinson And Company Splittable catheter composite material and process
US4811847A (en) * 1988-03-14 1989-03-14 Reif Thomas H Urinary catheter package
US4850358A (en) * 1986-11-14 1989-07-25 Millar Instruments, Inc. Method and assembly for introducing multiple devices into a biological vessel
US4921479A (en) * 1987-10-02 1990-05-01 Joseph Grayzel Catheter sheath with longitudinal seam
US4952359A (en) * 1987-02-06 1990-08-28 Becton, Dickinson And Company Method for making splittable catheter
US4966148A (en) * 1986-11-14 1990-10-30 Millar Instruments, Inc. Assembly for positioning diagnostic devices in a biological vessel
US4973313A (en) * 1989-09-13 1990-11-27 Sherwood Medical Company Over the needle catheter introducer
US4988356A (en) * 1987-02-27 1991-01-29 C. R. Bard, Inc. Catheter and guidewire exchange system
US5046497A (en) * 1986-11-14 1991-09-10 Millar Instruments, Inc. Structure for coupling a guidewire and a catheter
US5263932A (en) * 1992-04-09 1993-11-23 Jang G David Bailout catheter for fixed wire angioplasty
US5324269A (en) * 1991-09-19 1994-06-28 Baxter International Inc. Fully exchangeable dual lumen over-the-wire dilatation catheter with rip seam
US5342297A (en) * 1992-07-10 1994-08-30 Jang G David Bailout receptacle for angioplasty catheter
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US5389087A (en) * 1991-09-19 1995-02-14 Baxter International Inc. Fully exchangeable over-the-wire catheter with rip seam and gated side port
US5395335A (en) * 1991-05-24 1995-03-07 Jang; G. David Universal mode vascular catheter system
US5554118A (en) * 1991-05-24 1996-09-10 Jang; G. David Universal mode vascular catheter system
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US20040158231A1 (en) * 2001-06-29 2004-08-12 Allan Tanghoj Catheter device
US20040163980A1 (en) * 2001-06-29 2004-08-26 Allan Tanghoj Catheter assembly valve system
US20040176795A1 (en) * 2001-11-09 2004-09-09 Eric Leopold Reloadable sheath for catheter system for deploying vasoocclusive devices
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US7048719B1 (en) * 2002-06-07 2006-05-23 Microvention, Inc. Endovascular catheter resheathing apparatus and related methods
US20060241683A1 (en) * 2001-11-09 2006-10-26 Eric Leopold Reloadable sheath for catheter system for deploying vasoocclusive devices
WO2007030128A3 (fr) * 2004-12-06 2007-08-02 Mun Kyung Hong Dispositif de support externe
US20070225687A1 (en) * 2006-03-10 2007-09-27 House Jamie G Indwelling urinary catheterization assembley
US20080216839A1 (en) * 2007-03-07 2008-09-11 Rutter Michael John Tracheostomy Tube
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EP2596831A4 (fr) * 2010-07-23 2014-01-22 Kyung Jin Chung Ensemble pour l'insertion d'une sonde de foley
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EP3308823A1 (fr) * 2016-10-14 2018-04-18 Dentsply IH AB Assistance à l'insertion d'un cathéter
US20200179647A1 (en) * 2011-03-14 2020-06-11 Rochester Medical Corporation Catheter Grip And Method
US11730919B2 (en) 2012-11-20 2023-08-22 Rochester Medical Corporation Catheter in bag without additional packaging

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JPS5595687U (fr) * 1978-12-27 1980-07-02
JPS60122103U (ja) * 1984-01-26 1985-08-17 オリンパス光学工業株式会社 内視鏡挿入補助装置

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Also Published As

Publication number Publication date
DE2434192B2 (de) 1976-11-25
GB1477645A (en) 1977-06-22
JPS5330955B2 (fr) 1978-08-30
BE817015A (fr) 1974-10-16
CA1037811A (fr) 1978-09-05
DE2434192A1 (de) 1975-06-12
FR2252854B1 (fr) 1978-07-13
FR2252854A1 (fr) 1975-06-27
JPS5086884A (fr) 1975-07-12

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