FI65366C - IMPLANTS FOR STABILIZATION OF FASTSAETTNING AV RYGGRADEN - Google Patents

IMPLANTS FOR STABILIZATION OF FASTSAETTNING AV RYGGRADEN Download PDF

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Publication number
FI65366C
FI65366C FI811159A FI811159A FI65366C FI 65366 C FI65366 C FI 65366C FI 811159 A FI811159 A FI 811159A FI 811159 A FI811159 A FI 811159A FI 65366 C FI65366 C FI 65366C
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FI
Finland
Prior art keywords
plate
graft
branches
tips
wedge
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FI811159A
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Finnish (fi)
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FI811159L (en
FI65366B (en
Inventor
Janusz Daab
Zbigniew Mielnik
Lucja Cieslak
Jan Marciniak
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Politechnika Slaska Im Wincent
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Publication of FI811159L publication Critical patent/FI811159L/en
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Publication of FI65366B publication Critical patent/FI65366B/en
Publication of FI65366C publication Critical patent/FI65366C/en

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7062—Devices acting on, attached to, or simulating the effect of, vertebral processes, vertebral facets or ribs ; Tools for such devices
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30159—Concave polygonal shapes
    • A61F2002/30166—H-shaped or I-shaped
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30772—Apertures or holes, e.g. of circular cross section
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30904—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves serrated profile, i.e. saw-toothed
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0028—Shapes in the form of latin or greek characters
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00011—Metals or alloys
    • A61F2310/00017—Iron- or Fe-based alloys, e.g. stainless steel

Description

1 653661 65366

Selkärangan stabiiliksi sisäiseksi kiinnittämiseksi tarkoitettu siirrännäinenGraft for stable internal fixation of the spine

Keksinnön kohteena on siirrännäinen, joka on tarkoi-5 tettu selkärangan stabiiliksi sisäiseksi kiinnittämiseksi nikamien yhteenkasvamisen aikaansaamiseksi poistaen kiinnittämiseen käytetyn ulkopuolisen kipsauksen.The present invention relates to a graft for stable internal fixation of the spine to provide vertebral healing, eliminating the external plaster used for fixation.

Keksinnön mukaista siirrännäistä käytetään luunika-makirurgiassa.The graft according to the invention is used in bone marrow surgery.

10 Tähän asti tunnetut ja käytettävät selkärankamurtu- mien käsittelymenetelmät muodostuvat pitkään kestävästä ulkoisesta kipsikorsettien avulla suoritettavasta kiinnityksestä, mikä johtaa lihasten surkastumiin sekä makuuhaa-vaumiin, jotka tekevät pikaisen toipumisen mahdottomaksi.The hitherto known and used methods of treating vertebral fractures consist of a long-lasting external fixation by means of plaster corsets, which leads to muscle atrophy as well as to bed sores, which make rapid recovery impossible.

15 Leikkausmenetelmistä voidaan mainita sisäiset yhdistämiset jousien avulla, jolloin tukeminen jonkin ulkoisen kiinnitysmenetelmän avulla on välttämätöntä (Weiss, M. Materialy XXII Zjazdu Naukowego Pol. Tow, Ortop. Traum, Poznafi 1978, ss. 217 - 221).15 Among the cutting methods, internal joints by means of springs can be mentioned, in which case support by some external fastening method is necessary (Weiss, M. Materialy XXII Zjazdu Naukowego Pol. Tow, Ortop. Traum, Poznafi 1978, pp. 217-221).

20 Kahden levyn ja okahaarakkeille sovitettujen ruu vien avulla suoritettu sisäpuolinen yhdistäminen tuottaa suuria teknisiä vaikeuksia ja pidentää kirurgisen toimenpiteen aikaa (Rogers, W. A., "Cord injury during reduction of thoracis and lumbar wertebral-body fracture and dislocation", 25 J. Bone and Joint Surg. 20; 689, 1938).20 Internal joining with two plates and screws fitted to the okara columns presents major technical difficulties and prolongs the duration of the surgical procedure (Rogers, WA, "Cord injury during reduction of thoracis and lumbar wertebral-body fracture and dislocation", 25 J. Bone and Joint Surg 20; 689, 1938).

Keksinnön tarkoituksena on välttää mainitut hoidossa esiintyvät vaikeudet ja kehittää sellainen siirrännän-rakenne, joka takaisi stabiilin sisäisen yhdistymisen, lyhentäisi kirurgisen toimenpiteen kestoaikaa, poistaisi ul-30 kopuoliset kiinnitykset, mahdollistaisi nopean toipumisen ja estäisi makuuhaavojen syntymisen, jotka muodostavat vaikeimmat komplikaatiot halvaantuneilla potilailla kipsikor-setteja käytettäessä.The object of the invention is to avoid said treatment difficulties and to develop a graft structure which would guarantee a stable internal fusion, shorten the duration of the surgical procedure, remove ul-30 external attachments, allow rapid recovery and prevent bed sores, which are the most difficult complications in paralyzed patients with plaster. is used.

Tämä tulos on saavutettu työstämällä nauhan tai le-35 vyn muotoon tehty siirrännäinen.This result is achieved by machining an implant made in the form of a strip or le-35 plate.

6536665366

Keksinnön mukaiselle, seuraavassa Daabsche-levyksi nimitetylle siirrännäiselle on tunnusomaista, että siinä on levyn 1 molemmissa päissä kiilanmuotoiset leikkaukset 2, jotka on sovitettu keskustaa kohti symmetrisesti 5 pitkittäisakseliin nähden ja jotka päättyvät pyöristykseen 5, jolloin kiilanmuotoiset leikkaukset 2 muodostavat haarat 3, joissa on sisäsivulla hampaita 4, joilla on pyöristetyt kannat ja terävät, puolen jaon verran siirretyt kärjet, jotka hampaan kärjet 4 on viistottu edullisesti kul-10 massa 45° haaroja 3 pitkin ja päinvastaisesti vastapäätä olevilla haaroilla ja levy 1 on ulkosivulta keskiosasta 6 kavennettu. Siirrännäisen keskiosassa on asennusporausauk-ko. Siirrännäinen kiinnitetään sovittamalla haarat ja lyömällä hampaat sisään okahaarakkeiden peruspintaan. Siirrän-15 näisen haaran pituus on riippuvainen määrättyjen liikeseg-menttien laadusta. Haaroja voidaan kirurgisen toimenpiteen aikana muotoilla mielivaltaisesti tarkoituksenmukaisen laitteen avulla. Siirrännäisen valmistusaineella tulee olla tunnettu erityinen syöpymisen kestokyky, erityisesti siir-20 rännäiseltä vaadittua kiteensisäistä syöpymistä vastaan.The implant according to the invention, hereinafter referred to as a Daabsche plate, is characterized in that it has wedge-shaped cuts 2 at both ends of the plate 1, arranged symmetrically towards the center 5 with respect to the longitudinal axis and ending in a rounding 5, the wedge-shaped cuts 2 forming branches 3 4, which is rounded and sharp positions, offset by half a division of the tips of which the tooth tip 4 is tapered, preferably an angle of 10 ° to 45 mass bY legs 3 and along the opposite facing legs, and the plate 1 is tapered at the outer side 6 of the central portion. There is an installation bore in the middle of the implant. The graft is attached by fitting the arms and tapping the teeth into the base surface of the prong branches. The length of such a branch of the transfer-15 depends on the quality of the particular motion segments. The arms may be arbitrarily shaped during the surgical procedure by means of a suitable device. The graft material must have a known specific corrosion resistance, in particular against the intracrystalline corrosion required of the graft.

Daabsche-levy voidaan tehdä lejeerihgistä tai syöpymisen kestävästä, tyhjömetallurgialla, kuuma- ja kylmä-muokkauksella valmistetusta metallista, joka on nauhan tai levyn muodossa, vahvuuden ollessa 3,0 ± 0,1 mm. Korkeuden 25 vähenemisen suuruus ja hehkutusolosuhteet on valittava niin, että taataan mainitut mekaaniset ja fysikaalis-kemialliset ominaisuudet. Valmistusaineen lämpökäsittely täytyy suorittaa suoja-atmosfäärisää tai tyhjössä. Siirrännäinen voidaan 30 valmistaa levystä tai nauhasta lastuavalla työstöllä, säh-kökipinätyöstöllä tai leikkaamalla. Levyn leikkauksen yhteydessä se on hehkutettava polygonisoiden suoja-atmosfäärissä. Levyn loppukäsittelynä on elektrolyyttinen kiillotus ja passivointi.Daabsche sheet can be made of alloy or corrosion-resistant metal made by vacuum metallurgy, hot and cold forming, in the form of strip or sheet, with a thickness of 3.0 ± 0.1 mm. The magnitude of the reduction in height 25 and the annealing conditions must be chosen so as to guarantee the said mechanical and physico-chemical properties. The heat treatment of the ingredient must be carried out in a protective atmosphere or under vacuum. The graft can be made from sheet or strip by cutting, electrospark machining or cutting. When cutting a plate, it must be annealed in a protective atmosphere of polygons. The final treatment of the plate is electrolytic polishing and passivation.

35 Keksinnön mukaisen siirrännäisen etuna on, että se kiinnittää sisäpuolisesta vierekkäiset liikesegmentit tarpeen mukaan. Siirrännäisen pituus on riippuvainen kiin- 3 65366 riitettävien liikesegmenttien laadusta ja haaroja voidaan muotoilla mielivaltaisesti kirurgisen toimenpiteen aikana tarkoituksenmukaisen kojeen avulla.The advantage of the implant according to the invention is that it attaches adjacent motion segments from the inside as required. The length of the graft depends on the quality of the sufficient motion segments and the arms can be arbitrarily shaped during the surgical procedure by means of a suitable device.

Keksinnön kohdetta selitetään seuraavassa lähemmin 5 piirustuksessa esitetyn suoritusesimerkin yhteydessä/ jolloin: kuvio 1 esittää siirrännäisen poikkileikkausta, ja kuvio 2 esittää siirrännäisen hampaiden kärkien pit-kittäisviistotusta.The object of the invention will be explained in more detail below in connection with the embodiment shown in the drawing / in which: Fig. 1 shows a cross-section of the graft, and Fig. 2 shows a longitudinal chamfer of the tips of the graft teeth.

10 Keksinnön mukainen siirrännäinen on tehty levyn 1 muodossa 3 mm paksusta levystä. Levyssä 1 on päissään kii-lanmuotoiset leikkaukset 2, jotka on sovitettu keskustaa kohti symmetrisesti pitkittäisakseliin nähden ja päättyvät pyöristykseen 5. Kiilanmuotoiset leikkaukset 2 muodostavat 15 haarat 3, joissa on sisäsivulla hampaita 4, joilla on pyöristetyt kannat ja terävät puolen jaon verran siirretyt kärjet. Hampaiden 4 kärjet on viistottu kulmassa 45° haaroja 3 pitkin ja päinvastaisesta vastapäätä olevilla haaroilla ja levy 1 on ulkosivulta keskiosasta kavennettu ja sii-20 nä on asennusporausaukko.The graft according to the invention is made in the form of a plate 1 from a 3 mm thick plate. The plate 1 has at its ends KII lanmuotoiset sections 2 which are arranged symmetrically with respect to and end rounding 5. The wedge-shaped sections 2 form 15 branches 3, which is on the inside of the teeth 4, with the rounded support and sharp points offset by half a division of the longitudinal axis towards the center. The tips of the teeth 4 are chamfered at an angle of 45 ° along the branches 3 and on the opposite opposite branches, and the plate 1 is tapered on the outside from the central part and has a mounting bore.

Daabsche-levy valmistetaan seuraavalla tavalla:Daabsche board is manufactured as follows:

Levy tehdään alhaisen hiilipitoisuuden omaavasta kromi-nikkeli-mangaani-molybdeeniteräksestä, jonka vetolujuus on vähintään 510 MPa, venymislujuus vähintään 65 %, 25 kestotaivutuslujuus vähintään 250 MPa ja jolla on austeniit-tinen, ei-magneettinen rakenne ja jonka raekoko on pienempi kuin 4 (luokka ASTM). Nauhan aikaansaamiseksi käytetään tyhjiömetallurgiaa, kuuma- ja kylmämuokkausta sekä hehkutusta suoja-atmosfäärissä tai tyhjössä. Nauhan paksuus on 30 3,0 t 0,1 mm. Siirrännäinen valmistetaan nauhasta lastua valla työstöllä. Siirrännäisen loppukäsittelynä on mekaaninen kiillotus, elektrolyyttinen kiillotus ja passivointi. Valmistamalla 120 mm pitkästä nauhasta levy, jonka molemmilta sivuilta suuntautuvat 46 mm pitkät leikkaukset kes-35 kustaa kohti symmetrisesti pituusakselin suhteen, jotka leikkaukset kapenevat 40 mm etäisyydellä levyn päästä 4 65366 10 nun:stä 6 mm:iin ja päättyvät pyöristykseen, jonka säde on 12,5 nm, aikaansaadaan siirrännäisen haarat 3. Haaran sivun sisälle leikataan hampaat 4 8 mm:n jaotuksella ja joissa hampaissa on terävät kärjet ja pyöristetyt kannat 2 mmin säteillä. Vastapäätä olevilla haaroilla sijaitsevat hampaan kärjet on siirretty 4 mm. Kärjet on viistottu kulmassa 45° haaraa pitkin, ja vastapäätä olevilla haaroilla päinvastaisesti, jolloin vältetään okahaarakkeiden leikkautuminen irti haarojen kiinnittämisen yhteydessä toimenpiteen aikana. Siirrännäisen keskellä sijaitsee asennusporaus-aukko, jonka halkaisija on 3 mm, ja ulkosivulle on tehty siirrännäisen kavennus pyöristyksen säteen ollessa 50 mm.The plate is made of low-carbon chromium-nickel-manganese-molybdenum steel with a tensile strength of 510 MPa or more, a tensile strength of 65% or more, a tensile strength of 250 MPa or more, an austenitic, non-magnetic structure and a grain size of less than 4 (class ASTM). Vacuum metallurgy, hot and cold forming, and annealing in a protective atmosphere or vacuum are used to obtain the strip. The thickness of the strip is 30 t 0.1 mm. The graft is made of strip by chip processing. The final treatment of the graft is mechanical polishing, electrolytic polishing and passivation. By making a plate from a 120 mm long strip with 46 mm long cuts on both sides in the center-35 symmetrically with respect to the longitudinal axis, which cuts at a distance of 40 mm from the end of the plate 4 65366 10 nun to 6 mm and ends in a rounding with a radius of 12 , 5 nm, the branches 3 of the graft are obtained. Inside the side of the branch, teeth 4 are cut in 8 8 mm increments and the teeth have sharp tips and rounded bases with radii of 2 mm. The tooth tips on the opposite branches have been moved 4 mm. The tips are bevelled at an angle of 45 ° along the branch, and vice versa on the opposite branches, thus avoiding cutting off the prong branches when attaching the branches during the procedure. In the middle of the graft there is a mounting bore with a diameter of 3 mm and a constriction of the graft has been made on the outside with a radius of rounding of 50 mm.

Keksinnön mukainen siirrännäinen saatetaan käyttökuntoon ennen kiinnittämistä okahaarakkeiden peruspinnalle laajentamalla haaraa tarkoituksenmukaisen kojeen avulla.The graft according to the invention is put into operation before being attached to the base surface of the fork branches by extending the branch by means of a suitable device.

Claims (1)

5 65366 Patenttivaatimu s Siirrännäinen, joka on tarkoitettu selkärangan stabiiliksi sisäiseksi kiinnittämiseksi ja tehty levyn muotoiseksi nauhasta tai levystä, tunnettu siitä, 5 että siinä on levyn (1) molemmissa päissä kiilanmuotoiset leikkaukset (2), jotka on sovitettu keskustaa kohti symmetrisesti pitkittäisakseliin nähden ja jotka päättyvät pyöristykseen (5), jolloin kiilanmuotoiset leikkaukset (2) muodostavat haarat (3), joissa on sisäsivulla hampaita (4), 10 joilla on pyöristetyt kannat ja terävät, puolen jaon verran siirretyt kärjet, jotka hampaan kärjet (4) on viistottu edullisesti kulmassa 45° haaroja (3) pitkin ja päinvastai-sesti vastapäätä olevilla haaroilla ja levy (1) on ulkosivulta keskiosasta (6) kavennettu.A graft for the stable internal attachment of a spine made of a strip or sheet in the form of a plate, characterized in that it has wedge-shaped cuts (2) at both ends of the plate (1) arranged symmetrically towards the center with respect to the longitudinal axis. terminating radius (5), wherein the wedge-shaped sections (2) form the legs (3), which is on the inside of the teeth (4), 10 with rounded support and sharp, amount carried over from the tips of the side structure that tooth tips (4) is preferably bevelled at an angle 45 ° along the branches (3) and vice versa with the opposite branches and the plate (1) is tapered on the outside from the central part (6).
FI811159A 1980-04-15 1981-04-14 IMPLANTS FOR STABILIZATION OF FASTSAETTNING AV RYGGRADEN FI65366C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PL22351680 1980-04-15
PL22351680A PL124738B1 (en) 1980-04-15 1980-04-15 Implant for internal spine stabilization

Publications (3)

Publication Number Publication Date
FI811159L FI811159L (en) 1981-10-16
FI65366B FI65366B (en) 1984-01-31
FI65366C true FI65366C (en) 1984-05-10

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FI (1) FI65366C (en)
PL (1) PL124738B1 (en)

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Also Published As

Publication number Publication date
DE3113142C2 (en) 1985-05-30
PL124738B1 (en) 1983-02-28
PL223516A1 (en) 1981-10-16
FI811159L (en) 1981-10-16
FI65366B (en) 1984-01-31
DE3113142A1 (en) 1982-01-14

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