EP0865255A1 - Procedes et articles utilises pour faire adherer des couches matrices contenant du polysaccharide a des tissus - Google Patents

Procedes et articles utilises pour faire adherer des couches matrices contenant du polysaccharide a des tissus

Info

Publication number
EP0865255A1
EP0865255A1 EP96938809A EP96938809A EP0865255A1 EP 0865255 A1 EP0865255 A1 EP 0865255A1 EP 96938809 A EP96938809 A EP 96938809A EP 96938809 A EP96938809 A EP 96938809A EP 0865255 A1 EP0865255 A1 EP 0865255A1
Authority
EP
European Patent Office
Prior art keywords
tissue
energy
matrix material
polysaccharide
group
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.)
Withdrawn
Application number
EP96938809A
Other languages
German (de)
English (en)
Inventor
Donald G. Wallace
Cary J. Reich
Greg Dapper
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Baxter Healthcare Corp
Original Assignee
Fusion Medical Technologies 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 Fusion Medical Technologies Inc filed Critical Fusion Medical Technologies Inc
Publication of EP0865255A1 publication Critical patent/EP0865255A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/00491—Surgical glue applicators
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/00491—Surgical glue applicators
    • A61B2017/00495—Surgical glue applicators for two-component glue
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/00491—Surgical glue applicators
    • A61B2017/00504—Tissue welding
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/00491—Surgical glue applicators
    • A61B2017/00504—Tissue welding
    • A61B2017/00508—Tissue welding using laser

Definitions

  • the present invention relates generally to methods and articles for fusing matrix materials to form layers over tissue. More particularly, the present invention relates to fusing polysaccharide-containing matrix layers to tissues for wound closure, and other purposes.
  • matrix materials may be applied to tissue in order to effect or enhance wound closure, to augment and repair tissue defects, and the like.
  • a variety of specific compositions and methods have been devised for such purposes.
  • the fusing of collagen and other proteins by the application of laser and other energy sources has been suggested for the closure of wounds. See, for example, U.S. Patent Nos. 5,156,613; 5,209,776; and 5,071,417.
  • the application of pre-polymer materials followed by light- induced cross-linking has also been proposed. See, for example, PCT publications WO 94/24962 and WO 94/21324.
  • compositions comprising carboxymethyl-cellulose and hyaluronic acid for placement over tissue to inhibit adhesion and for other purposes.
  • U.S. Patent No. 4,582,865 described the preparation of cross- linked hyaluronic acid gels.
  • Such materials should also possess a degree of elasticity and conformability to enhance positioning and adherence to the underlying tissue, particularly when the tissue undergoes movement which can stress the matrix material.
  • the materials should further be biocompatible and, at least in some instances, biodegradable so that they can be resorbed or degraded over time.
  • the present invention provides improved methods and articles for fusing a matrix material to tissue for a variety of purposes, including wound closure, tissue augmentation, or the like.
  • the matrix material comprises a polysaccharide component which when placed over a target location on the tissue will fuse to the tissue upon the application of energy, such as radio freguency energy, laser energy, ultrasonic energy, heat, infrared, microwave or the like.
  • the energy will be applied in an amount sufficient to fuse the matrix material to the underlying tissue with a peel bond strength of at least about 0.03 N/cm.
  • the terms "fuse” and "fusing” will mean that the matrix material has been caused to adhere to the underlying tissue with a peel bond strength (defined below) of at least about 0.03N/cm.
  • exemplary polysaccharides include cellulose derivatives such as hydroxyethyl-cellulose, hydroxy propyl-methyl-cellulose and carboxymethyl-cellulose; glycosaminoglycans such as hyaluronic acid, chondroitin sulfate, chitin and chitosan; starch derivatives such as starch/hydroxyethyl starch; agarose; and alginate and combinations thereof.
  • a particularly preferred combination is that of carboxymethyl-cellulose and hyaluronic acid, typically in an equal parts mixture, as described in WO 96/20349.
  • the matrix material may be applied (prior to exposure to energy) in a variety of forms, usually being a solid, mesh, or composite layer e.g. a film, usually a thin film having a thickness of at least 0.01 mm, more usually in the range from 0.05 mm to 1 mm.
  • the matrix material may comprise a dispersible, non-solid phase, such as liquids, gels, sols, suspensions, powders, and the like.
  • the matrix material may comprise substantially pure polysaccharide (s) , but in many cases it will be desirable to combine additional components, such as carrier materials, reinforcement materials, plasticizers, and the like. After the application of energy, a layer of the matrix material will usually fuse to the underlying tissue with the requisite peel bond strength.
  • the layer will typically have a thickness of at least about 0.03 mm, usually being in the range from about 0.05 mm to about 0.1 mm, and the layer will usually form a substantially continuous surface on the underlying tissue.
  • the area may vary widely, typically being at least about 0.05 cm 2 , usually being in the range from about 1 cm 2 to about 100 cm 2 .
  • chitosan and chitin films may be applied to tissue under hydrating conditions, where the films adhere without the application of energy.
  • Articles according to the present invention comprise a sheet of the matrix material generally as described above.
  • the sheets will usually be sterilized and present in a sterile package for distribution and storage prior to use.
  • Fig. 1 is a perspective view of a sheet of matrix material according to the present invention.
  • Fig. 2 is a top view of a package containing the matrix material of Fig. 1, shown with a portion broken away.
  • Fig. 3 is a schematic illustration of a region of tissue having a wound therein.
  • Fig. 4 illustrates the method of the present invention wherein a solid sheet of matrix material is placed over the wound of Fig. 3 and radio frequency (RF) energy is used to fuse the matrix material to the tissue.
  • RF radio frequency
  • Fig. 5 illustrates an alternative embodiment of the method of the present invention, wherein a liquid or gel matrix material is applied using a syringe to the wound in the tissue of Fig. 3.
  • Fig. 6 illustrates the application of RF energy to the liquid matrix material of Fig. 5.
  • Fig. 7 illustrates a resulting layer of matrix material which has been bonded to tissue according to the method of the present invention.
  • Tissues include virtually all human and animal body tissues, including the skin (epidermis) , as well as the external and internal surfaces of virtually all body organs.
  • the present invention is particularly useful for fusing matrix materials to fragile body organs, such as lungs, stomach, liver, spleen, intestines, colon, fallopian tubes, esophagus, ovary, uterus, bladder, and the like.
  • the matrix material may be applied for a variety of purposes, including wound closure, tissue augmentation, and the like. Wounds to be treated may result from accidental trauma, surgical intervention, or virtually any other cause. Tissue augmentation will usually be performed to fill or cover regions of tissue where tissue has been lost or damaged, such as abrasions, burns, and the like.
  • the matrix materials of the present invention will comprise a polysaccharide component, as described in more detail below.
  • the polysaccharide will be selected to provide for bonding of the resulting layer of matrix material, typically providing a peel bond strength of at least about 0.03 N/cm, preferably at least about 0.07 N/cm, and usually in the range from about 0.07 N/cm to about 0.2 N/cm.
  • Peel bond strength can be measured by conventional techniques. A particular method for measuring peel bond strength is as follows. Pieces of the matrix material (1.5 cm x 3 cm) are cut and glued to a plastic tab (1.5 cm x 3 cm) which overlaps the test material by 1 cm over the width (the 1.5 cm dimension) , using a cyanoacrylate glue.
  • a hole is pierced in the tab, and the test material bonded to the tissue in vivo or in vi tro .
  • a digital force gauge such as an Omega DF051-2 fitted with a 21 pound force transducer, Omega Instruments, Stamford, Connecticut, is attached to the plastic tab using a hook attachment which is secured to hole in the plastic tab.
  • a manual upward force is then applied on the force gauge, and the sample peeled off with an even rate of pull, typically about 3 cm per second. Peel strengths are recorded in force (Newtons) divided by the width of the sample (1.5 cm) in order to determine the peel bond strength. The peel bond strength is measured as a maximum.
  • the polysaccharide component may comprise one, two, or more individual polysaccharides.
  • Exemplary polysaccharides include cellulose derivatives such as carboxymethyl-cellulose; hydroxyethyl-cellulose, hydroxy propyl-methyl-cellulose,• glycosaminoglycans such as hyaluronic acid, chondroitin sulfate, chitin and chitosan; agarose, and alginate; and starch derivatives such as starch/hydroxyethyl starch.
  • Preferred polysaccharide materials will include at least a cellulose component, particularly carboxymethyl-cellulose, optionally in combination with a glycosaminoglycan component, such as hyaluronic acid.
  • a particularly preferred material is a mixture of carboxymethyl-cellulose and hyaluronic acid, typically in equal parts, such as that sold under the tradename SEPRAFILM by Genzyme Corporation.
  • the polysaccharides may comprise substantially all of the matrix material, or may comprise only a portion thereof. In the latter case, additional components may be included, such as carrier substances, reinforcing materials (e.g., reinforcing meshes, fibers, filaments, braids and the like) , and plasticizers.
  • carrier substances include collagen and gelatin.
  • the matrix material will usually be in the form of a solid layer, e.g., in the form of a sheet, film, patch, strip, mesh, or the like. The use of a mesh allows tissue to form a coagulum within the intristices of the mesh as energy is applied, as described in copending application serial no. 08/303,336, the disclosure of which is incorporated herein by reference.
  • the solid phase forms of the matrix material may optionally be reinforced with filaments, braids, meshes, and other woven and non-woven reinforcement materials.
  • the reinforcement materials will be non- bioabsorbable so that they will remain even after the fusible material has been resorbed.
  • Exemplary reinforcement materials include polymeric braids or meshes, particularly composed of polypropylene (Marlex ® ) , fluorinated hydrocarbon polymers (Gore-Tex ® ) , polyesters (such as Dacron ® ) , and the like. In other cases, the reinforcement materials may be biodegradable.
  • biodegradable materials include polylactic acid, polyglycolic acid, copolymers of lactic acid and glycolic acid, polyhydroxybutyrate, other poly ( ⁇ -hydroxy acids) polydioxanone, and the like in filaments, braids, meshes, woven and non-woven forms may be used.
  • Reinforced and non-reinforced matrix materials may be formed by conventional techniques for forming and solidifying polysaccharides.
  • the polysaccharides will be cross-linked to enhance structural integrity.
  • the polysaccharides may be dissolved in water to form a gel.
  • the gel may then be layered over a flat surface to a desired thickness, and the gel dried to form a solid sheet.
  • Such sheets will typically have a thickness in the range from about 0.03 mm to about 0.15 mm, usually from about 0.05 mm to about 0.1 mm.
  • the sheets will preferably have an area of at least about 0.5 cm 2 , preferably at least about 1 cm 2 , and usually in the range from about 1 cm 2 to about 100 cm 2 . It will be appreciated that sheets of various sizes can be trimmed to an appropriate size and shape for a particular application.
  • the matrix materials may be applied to the target region on the tissue in a non-solid dispersible state, e.g., as a liquid, gel, paste, spray, sol or combination thereof .
  • Such dispersible matrix materials may be applied using syringes, brushes, sprayers, spatulas, or other methods suitable for spreading or dispersing a thin layer of the material over the wound region.
  • the thin layer will have a thickness in the range from about 0.01 mm to about 5 mm, preferably from about 0.05 mm to about 1 mm.
  • the method of the present invention will utilize energy of a type and in an amount sufficient to fuse the matrix material including the polysaccharide to underlying tissue.
  • Suitable energy sources include electrical energy, particularly radio frequency (RF) energy, heat energy, laser energy, ultrasonic energy, infrared, microwave, and the like.
  • RF energy sources such as those available as electrosurgicai power supplies from companies such as Valleylab, Boulder, Colorado, and Con-Med, Utica, New York, employing conventional RF-applying probes.
  • Particularly preferred are modified RF energy sources which provide for a dispersed or distributed current flow from a hand-held probe to the tissue.
  • a radio frequency inert gas device or inert gas beam coagulator which relies on flow of an inert ionizable gas, such as argon, for conducting current from the probe to the tissue.
  • inert gas beam coagulators are available commercially from suppliers such as Con-Med and Valleylab.
  • Energy from the energy source is typically directed to the tissue using a probe connected to an external power supply.
  • the treating physician usually directs the probe manually to apply energy over the surface of the matrix material and visually confirms that fusion has been achieved.
  • an energy output from about 2W to about 100W, preferably from about 20W to about 40W, will be used.
  • the fusible material will typically be exposed to the energy for a total time from about 5 seconds to about 120 seconds, usually from about 10 seconds to about 40 seconds, for material having an area from about 1 cm 2 to about 10 cm 2 . The precise timing depends on the physician's visual assessment that the matrix material has fused to the underlying tissue.
  • a solid sheet 12 of matrix material comprising a polysaccharide component according to the present invention is illustrated.
  • the sheet is square, but sheets having a variety of other regular and irregular geometries, such as rectangles, circles, ovals, and the like, could also be fabricated.
  • the surface area, thickness, and other characteristics of the sheet 12 are preferably (but not necessarily) as described above.
  • the solid sheet 12 is usually packaged in a manner suitable to facilitate use by the treating physician.
  • the sheet material is sterilized and packaged in a suitable container, such as a pouch, box, canister, bottle, or other conventional receptacle for medical products.
  • a suitable container such as a pouch, box, canister, bottle, or other conventional receptacle for medical products.
  • the sheet 12 is illustrated as packaged in a pouch comprising a front sheet 14 and back sheet 16, where the sheets are laminated together around the edge to seal the interior of the package.
  • the sheet material is rolled and packaged in order to provide larger areas of material. Sterilization of the sheet material 12 is accomplished, prior to, during, or after packaging. Suitable sterilization techniques include the use of sterilizing gases, sterilizing radiation, heat, or the like.
  • the solid sheet 12 or other form of the material of the present invention will be packaged together with written instructions setting forth the methods described herein, i.e. that the materials are to be placed over a target site in tissue and energy applied to effect bonding.
  • the instructions may be printed on the packaging material (e.g.
  • a strip 20 of the matrix material of the present invention for covering and sealing a wound W in a region of tissue T is illustrated.
  • the strip 20, which has been be trimmed to size prior to use, is placed over the wound W as shown in Fig. 4.
  • energy such as radio frequency energy is applied over the strip using a hand-held probe 22, as illustrated in Fig. 4.
  • the energy is applied by passing the probe 22 over the upper, exposed surface of the strip to fuse the polysaccharide-containing strip to the underlying tissue. Exemplary power levels, exposure times, and the like, are described above.
  • Figs. 5 and 6 an alternative method for applying matrix material to the wound W on the region of tissue T is illustrated.
  • Liquid or gel matrix material 30 is applied using a syringe 32, typically in a series of parallel strips 34.
  • Other patterns of application could also be employed, such as circular, spiral, criss-crossed, and the like. It is generally desirable, however, that material be applied at a relatively uniform density over the tissue, so that, after application of energy, a generally continuous layer of matrix material 36 results, as shown in Fig. 6. Again, the energy is typically applied using the hand-heId probe 22.
  • the matrix material is in the form of a generally continuous layer 40 of material which adheres to the upper surface S of the tissue T.
  • the layer 40 of material will adhere to the tissue T with a minimum peel bond strength as set forth above.
  • the layer 40 will have a relatively high tensile strength so that it can maintain the integrity of the tissue T over the wound W.
  • Cross-linked polysaccharide gel materials were prepared from carboxymethyl-cellulose (250 kD) , hyaluronic acid, chondroitin sulfate, and chitosan as follows. Each of the polysaccharides was dissolved in 0.2M sodium hydroxide at 4% solids (w/v) to produce a viscous liquid. Divinyl sulfone was rapidly mixed with the viscous liquid to achieve a 0.1% dispersion. A cross-linked gel formed within 1 hour at room temperature, as described in U.S. Patent No. 4,582,865. The gels were washed with 0.3M sodium chloride to remove the sodium hydroxide, and the washed gel was air dried to produce a film. The resulting films had thicknesses from 0.04 mm to 0.1 mm.
  • Non-cross-linked polysaccharide films were cast from 4% (w/v) chitosan solutions in 1% (w/v) aqueous acetic acid and were air dried.
  • the polysaccharide films described above were applied to porcine lung and energy applied as follows. Porcine lung was received on ice from a slaughterhouse, usually within a day of slaughter. The lung was divided at the main bronchus, and one side was used for each test series. A tube was fitted to the largest bronchus, and air was pumped into the lung using a pump (Air Cadet Model 7059-42, Cole-
  • Parmer Instruments, Niles, IL Parmer Instruments, Niles, IL to achieve inflation.
  • the lung was housed in a chamber of clear acrylic, which was mounted on a heated platform.
  • the air pressure lines were also passed through a heated circulating bath. Heated 0.9% aq. sodium chloride was sprayed on the lung tissue at intervals.
  • Tissue temperatures were maintained between 29° and 40°C, preferably between 37° and 40°C.
  • Tissue welding with argon beam coagulator and peel strength measurements on porcine lung in vi tro were performed as follows. Film samples (2 cm x 3 cm) were placed on porcine lung tissue, and the tissue placed in contact with the return electrode of the argon beam coagulator, usually on the underside. Immediately upon placing on the tissue, the film began to hydrate.
  • Welding was preferably performed within 20 sec after placing on tissue, since bonding was a function of film hydration.
  • the spark discharge from the tip of the coagulator was then directed onto a patch at a distance of a few mm between tip and film.
  • the coagulator was typically set at 40 W of power and 2-4 liters/min of argon gas flow. Other settings were explored, but the strength of the bond achieved was less.
  • the spark discharge was maintained for 2-5 sec per cm 2 of film. Application of the argon spark was terminated when the film became desiccated or showed signs of carbonization.
  • Peel strength measurements were performed on the films to which polystyrene tabs had been bonded using cyanoacrylate glue (prior to bonding with the argon beam) .
  • the polystyrene was approximately 0.5 mm thick, and a hole approximately 4 mm in diameter was punched in the free edge.
  • the tab was hooked (through the hole) to a digital force gauge (Omega model DFG51-2, 2 lb load cell, Omega Engineering, Inc.,
  • the gauge was set to zero force, and then the gauge was raised manually at a rate of approximately 1 cm/sec to effect a peeling detachment of the film. The gauge was lifted until the film was separated from the tissue. The maximum force registered during the peeling operation was recorded as Newtons of force per cm width of film. Peel strength measurements were typically commenced 3 min after welding to tissue.
  • a 2 x 4 cm (approximately 0.05 mm thick) piece of composite material comprising two anionic polysaccharides, sodium hyaluronic acid (IIA) and carboxymethyl-cellulose (CMC) , Seprafilm TM (Genzyme Corp., Cambridge, MA) was placed on naive lung tissue. Pre-beam apposition was very good. Energy was applied with the ABC 6400 unit (Birtcher Medical Systems, Irvine, California) with settings of 40 watts power and gas flow rate of 4 liters/minute. Three minutes after application of energy and irrigation with saline, the piece was carefully examined and showed good bonding and integrity.
  • a wedge resection of the lung was performed to expose two bronchioles of ⁇ 2 mm diameter. Air leak was documented.
  • Four 2 x 4 cm pieces of Seprafilm " were placed over the resection and leaking bronchiole and attached using an argon beam coagulator. All leaks were sealed when tested by inflating the lung to 25 cm water pressure.
  • the thoracotomy was closed and air leak measured through a chest tube. Zero flow rate was recorded at 2 minutes 25 seconds i.e. the lung was not leaking and was maintained for 4 hours. Recordings were stopped, chest tube removed and the animal was recovered.
  • the matrix material cannot seal a surgically induced air leak without the application of energy. Using a farm grade Hampshire/Yorkshire cross pig

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Surgery (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Materials For Medical Uses (AREA)

Abstract

Matériau matrice (12) contenant un constituant polysaccharide que l'on fait adhérer à des tissus (T) en plaçant d'abord le matériau matrice (12) sur un emplacement cible (W) sur les tissus et en appliquant ensuite de l'énergie sur le matériau matrice (12). Le constituant polysaccharide est d'un type tel, et l'énergie est appliquée en quantité telle qu'il en résulte l'adhésion de la matrice aux tissus.
EP96938809A 1995-11-07 1996-11-06 Procedes et articles utilises pour faire adherer des couches matrices contenant du polysaccharide a des tissus Withdrawn EP0865255A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US632495P 1995-11-07 1995-11-07
US6324P 1995-11-07
PCT/US1996/017840 WO1997017023A1 (fr) 1995-11-07 1996-11-06 Procedes et articles utilises pour faire adherer des couches matrices contenant du polysaccharide a des tissus

Publications (1)

Publication Number Publication Date
EP0865255A1 true EP0865255A1 (fr) 1998-09-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP96938809A Withdrawn EP0865255A1 (fr) 1995-11-07 1996-11-06 Procedes et articles utilises pour faire adherer des couches matrices contenant du polysaccharide a des tissus

Country Status (3)

Country Link
EP (1) EP0865255A1 (fr)
AU (1) AU7609896A (fr)
WO (1) WO1997017023A1 (fr)

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FR2789885B1 (fr) * 1999-02-19 2001-05-04 Brothier Lab Dispositif de renfort de suture
WO2002009593A1 (fr) * 2000-07-28 2002-02-07 Les Laboratoires Brothier Dispositif de renfort de suture
CN102014973A (zh) 2008-02-29 2011-04-13 弗罗桑医疗设备公司 用于促进止血和/或伤口愈合的装置
CA2865349C (fr) 2012-03-06 2021-07-06 Ferrosan Medical Devices A/S Recipient mis sous pression contenant de la pate hemostatique
EP2825216B1 (fr) 2012-06-12 2015-08-19 Ferrosan Medical Devices A/S Composition hémostatique sèche
CN105358071B (zh) 2013-06-21 2018-07-31 弗罗桑医疗设备公司 真空膨胀的干组合物和用于保留该干组合物的注射器
CN105828844B (zh) 2013-12-11 2019-09-27 弗罗桑医疗设备公司 包含挤出增强剂的干组合物
CN106999621B (zh) 2014-10-13 2020-07-03 弗罗桑医疗设备公司 用于止血和伤口愈合的干组合物
AU2015371184B2 (en) 2014-12-24 2020-06-25 Ferrosan Medical Devices A/S Syringe for retaining and mixing first and second substances
BR112017027695A2 (pt) 2015-07-03 2018-09-04 Ferrosan Medical Devices As seringa para retenção e mistura de primeira e segunda substâncias
ES2968412T3 (es) 2018-05-09 2024-05-09 Ferrosan Medical Devices As Método para preparar una composición hemostática

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Also Published As

Publication number Publication date
WO1997017023A1 (fr) 1997-05-15
AU7609896A (en) 1997-05-29

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