DK158199B

DK158199B - Method for the manufacture of deodorizing gas filters

Info

Publication number: DK158199B
Application number: DK224783A
Authority: DK
Inventors: Klaus Moeller
Original assignee: Dansac As
Priority date: 1983-05-20
Filing date: 1983-05-20
Publication date: 1990-04-09
Also published as: DK158199C; DK224783D0; DK224783A

Description

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DK 158199 BDK 158199 B

Den foreliggende opfindelse angår en fremgangsmåde til fremstilling af deodoriserende gasfilter til deodorisering af tarmluft fra mennesker med stomier, dvs. ved kirurgisk indgreb tilvejebragte tarmåbninger i bugvæggen som følge af sygdom eller ulykkestilfælde.The present invention relates to a method for producing deodorizing gas filters for deodorizing intestinal air from people with stomas, i.e. by surgery, intestinal openings are provided in the abdominal wall as a result of illness or accident.

5 Sådanne stomier indebærer, at det ikke er muligt ad viljens vej at kontrollere udskillelsen af fæcalt materiale (fæces, væske og tarmgasser), som derfor til stadighed må opsamles, oftest ved hjælp af en fastgjort plastpose. Fastgørelsen af denne pose kan ske ved klæbning til huden omkring stomien og/eller med bælte. Ved fastgørelsen er det 10 afgørende at sikre en fuldstændig lugttæthed. Poserne kan være lukkede (skiftes 1-2 gange i døgnet) eller tømbare (tømmes efter behov og skiftes 1-2 gange om ugen).5 Such ostomy means that it is not possible, at will, to control the excretion of faecal matter (faeces, liquids and intestinal gases), which must therefore be constantly collected, most often by means of a fixed plastic bag. This bag can be secured by adhering to the skin around the stoma and / or with a belt. When fastening, it is essential to ensure complete odor density. The bags can be closed (changed 1-2 times a day) or emptied (emptied as needed and changed 1-2 times a week).

På grund af den gastætte forbindelse mellem stomiåbningen og posen fyldes den ofte med tarmgas tidligere, end man normalt ønsker at 15 skifte pose, hvorved posen udspiles og giver anledning til såvel fysiske som psykiske gener for bæreren, som må gå afsides og tømme posen for gas - enten ved at løsne bandagen eller ved at prikke hul foroven i posen og bagefter lukke dette med en lugttæt klæbebrik.Due to the gas-tight connection between the ostomy opening and the bag, it is often filled with intestinal gas earlier than one would normally wish to change the bag, thereby causing the bag to become flushed and giving rise to both physical and mental nuisance for the wearer, who has to leave and empty the bag for gas. - either by loosening the bandage or by pricking a hole in the top of the bag and afterwards closing this with an odor-proof adhesive.

For at afhjælpe generne ved en sådan oppustet stomipose har flere 20 producenter i de senere år konstrueret og markedsført forskellige typer af ventilationsorganer, som kontinuerligt skal kunne udlufte stomiposen og samtidig tilbageholde de ildelugtende sporstoffer i tarmgassen.In order to remedy the nuisance of such an inflated ostomy bag, more than 20 manufacturers have in recent years designed and marketed various types of ventilation organs that must be able to continuously vent the ostomy bag and at the same time retain the smelly trace elements in the intestinal gas.

De hyppigst anvendte ventilationsorganer er filtre bestående af en 25 matrix (som kan være en kunstlatex eller dispersion), hvori er indlejret granuleret aktivt kul, som er i stand til at absorbere de ildelugtende sporstoffer. Sådanne filtre kan være færdigmonteret på stomiposen eller være en løs filterskive, som monteres på posens yderside af brugeren.The most frequently used ventilation means are filters made up of a matrix (which may be an artificial latex or dispersion) in which are embedded granulated activated charcoal capable of absorbing the smelly trace elements. Such filters may be pre-mounted on the ostomy bag or be a loose filter disc mounted on the outside of the bag by the user.

30 I denne forbindelse kan henvises til dansk patentskrift nr. 130.277.30 In this connection, reference can be made to Danish Patent Specification No. 130,277.

Her er filteret en kvadratisk skive, hvor den ene side er dækket med et gastæt materiale med en central ventilationsåbning, medens den anden overflade af skiven er dækket med et andet dække af gastætHere, the filter is a square disc, where one side is covered with a gas-tight material with a central ventilation opening, while the other surface of the disc is covered with another cover of gas-tight

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2 materiale med flere åbninger i forhold til midten, hvorved de gasser, der skal bortledes, passerer ad en skrå, til dels radial vej gennem filteret. Et lignende filter er vist i dansk patentskrift nr. 133.080. Her har et af de tætte dakker en central ventilationsåbning 5 og det modsatte dakke flere ventilationsåbninger javnt fordelt over filterskivens areal.2 material with several openings relative to the center, whereby the gases to be discharged pass through an inclined, partly radial path through the filter. A similar filter is shown in Danish patent specification 133,080. Here, one of the dense roofs has a central ventilation opening 5 and the opposite roof has several ventilation openings evenly distributed over the area of the filter disc.

Ifølge dansk patentskrift nr. 135.303 er filterelementet udformet således, at gassen bliver tvunget radialt gennem en cirkular filterskive ad en vej, som er betydeligt længere end den aksiale retning 10 tværs gennem skiven.According to Danish Patent Specification No. 1355.303, the filter element is designed such that the gas is forced radially through a circular filter disc along a path which is considerably longer than the axial direction 10 across the disc.

Ovennævnte ventilationsorganer har vist sig i mange tilfælde ikke at være tilstrækkeligt effektive, hvilket ifølge dansk patentskrift nr.The above-mentioned ventilation means have in many cases proved not to be sufficiently effective, which according to Danish patent no.

141.392 sandsynligvis skyldes dels manglende udnyttelse af kullets absorptionskapacitet på grund af gassens ret korte vej gennem mate-15 rialet, dels at der dannes kanaler mellem væggene og det absorberende materiale, således at gasserne - der jo følger den vej, der yder mindst modstand - passerer ad kanaler mellem filtermaterialet og væggene og kun i mindre grad tvinges gennem det absorberende filtermateriale. Dette problem løses ifølge dansk patentskrift nr. 141.392 20 ved at klæbe filtermaterialet til de gastætte vægge, hvorved man undgår kanaldannelse mellem vægge og materiale.141,392 is probably partly due to the lack of utilization of the coal's absorption capacity due to the rather short path of the gas through the material and partly to the formation of channels between the walls and the absorbent material, so that the gases - which follow the path which provides the least resistance - pass through through channels between the filter material and the walls and only to a lesser extent forced through the absorbent filter material. This problem is solved according to Danish Patent No. 141,392 20 by adhering the filter material to the gas-tight walls, thereby avoiding duct formation between walls and material.

Det siger sig selv, at filtermaterialet må have en vis porøsitet for at kunne absorbere gasarter, og det har vist sig, at de hidtidige filtermaterialer med tilstrækkeligt ønskevardigt indhold af aktivt 25 kul udviser manglende kohæsion, således at filtermaterialet falder fra hinanden (eventuelt delaminerer), eller der dannes større kanaler inde i filtermaterialet, hvorigennem gassen vil søge og dermed ikke komme i tilstrækkelig kontakt med det aktive kul. I disse tilfælde er det således ikke kun mellem vægge og filtermateriale, at der kan 30 opstå uønskede kanaler, men også inde i selve filtermaterialet. Jo større mængde aktivt kul i et givet matrix-volumen, desto større tendens til kanaldannelse på grund af utilstrækkelig kohæsion.It goes without saying that the filter material must have some porosity in order to absorb gases, and it has been found that the previous filter materials with sufficiently desirable active carbon content exhibit a lack of cohesion, so that the filter material falls apart (possibly delaminates). , or larger ducts are formed inside the filter material through which the gas will search and thus not come in sufficient contact with the activated charcoal. In these cases, it is thus not only between walls and filter material that undesirable channels can occur, but also within the filter material itself. The greater the amount of activated carbon in a given matrix volume, the greater the tendency for channel formation due to insufficient cohesion.

I nærværende tilfælde, hvor det drejer sig om gasfilter til stomipo-se, er det ønskværdigt at minimere filterets volumen mest muligt - ogIn the present case, in the case of gas filters for ostomy bags, it is desirable to minimize the volume of the filter as much as possible - and

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3 samtidig skabe en så stor kohæsion, at der i filtermaterialet ikke dannes kanaler, så gassen tvinges igennem hele filtermaterialets tværsnit og dermed deodoriseres maksimalt.3 at the same time create such a large cohesion that no channels are formed in the filter material, so that the gas is forced through the entire cross-section of the filter material and thus maximally deodorizes.

Ved opfindelsen er der blevet tilvejebragt en fremgangsmåde til 5 fremstilling af deodoriserende gasfilterelementer, idet der i et filtermateriale omfattende en i det væsentlige plan matrix med et højt indhold af fint granuleret aktivt kul udformes et antal tæt anbragte, gennemgående huller, hvorefter filtermaterialets ydre overflade påføres et overtræk af en plastdispersion således, at denne 10 bringes til at udfylde de gennemgående huller, hvorefter plastdispersionen hærdnes, og fremgangsmåden ifølge opfindelsen er ejendommelig ved, at filtermaterialet opskæres i strimler, og at plastdispersionen påføres filtermaterialet ved, at strimlerne neddyppes i plastdispersionen, og at hver af strimlerne derefter opskæres i filterelementer 15 ved tværgående snit.The invention provides a method for producing deodorizing gas filter elements, in which a filter material comprising a substantially flat matrix with a high content of finely granulated activated carbon forms a plurality of closely spaced, through holes, upon which the outer surface of the filter material is applied. a coating of a plastic dispersion such that it is filled to fill the through holes, after which the plastic dispersion is cured and the process of the invention is characterized in that the filter material is cut into strips and that the plastic dispersion is applied to the filter material by immersing the strips and plastic dispersion. each of the strips being then cut into filter elements 15 by transverse sections.

Der kan på denne måde fremstilles langstrakte filterelementer med et filtermateriale, der er tæt omsluttet af et gastæt plastovertræk, og hvor modstående vægge af plastovertrækket er indbyrdes forbundet ved hjælp af gennemgående forankringsstrenge. Ved at give hvert af fil-20 terelementerne en passende længde i forhold til filterelementets tværsnit kan man opnå, at gas, der strømmer igennem filterelementets filtermateriale, fordeles nogenlunde ensartet over filterelementets tværsnitsareal, hvorved man opnår en god udnyttelse af filtermaterialet. Filtermaterialet kan bestå af en speciel bomuldsmatrix, hvori 25 der er indlejret en meget stor mængde fint granuleret aktivt kul, og plastdispersionen kan eksempelvis være ethylen-vinylacetat eller vinylchlorid.In this way, elongated filter elements can be made with a filter material, which is tightly enclosed by a gas-tight plastic coating, and the opposing walls of the plastic coating are interconnected by means of continuous anchoring strands. By giving each of the filter elements an appropriate length relative to the cross-section of the filter element, it is possible to achieve that gas flowing through the filter material of the filter element is distributed approximately uniformly over the cross-sectional area of the filter element, thereby obtaining good utilization of the filter material. The filter material may consist of a special cotton matrix in which a very large amount of finely granulated activated carbon is embedded, and the plastic dispersion may be, for example, ethylene-vinyl acetate or vinyl chloride.

Den gas, der skal føres gennem det deodoriserende filterelement, kan strømme på langs gennem filterelementet fra den ene snitflade til den 30 anden. Der kan imidlertid i den midterste del af hvert filterelement i plastovertrækket udformes ét eller flere gasgennemstrømningsåbninger, og gassen kan da strømme ind gennem begge filterelementets snitflader og ud gennem gasgennemstrømningsåbningerne.The gas to be passed through the deodorizing filter element can flow longitudinally through the filter element from one interface to the other. However, one or more gas flow openings can be formed in the middle part of each filter element in the plastic coating, and the gas can then flow through both the cut surfaces of the filter element and out through the gas flow openings.

DK 158199 BDK 158199 B

44

Alternativt kan snitfladen ved den ene ende af hvert af filterelemen-teme forsegles, og der kan ved den ende udformes ét eller flere gasgennemstrømningsåbninger. I sidstnævnte tilfælde kan den ikke forseglede snitflade anvendes som gasindstrømningsåbning, medens 5 gasgennemstrømningsåbningerne kan anvendes som udstrømningsåbninger.Alternatively, the cut surface at one end of each of the filter elements may be sealed and one or more gas flow openings may be formed at that end. In the latter case, the non-sealed cut surface can be used as a gas inlet opening, while the 5 gas flow openings can be used as outflow openings.

Produktet er skitseret i fig. 1 på medfølgende tegning, hvor fig. la, lb og lc viser produktet set henholdsvis fra oven, fra siden og fra enden. Processen foregår ved, at det hullede filtermateriale - der foreligger i "bændler" af den passende bredde - neddyppes i en plast-10 dispersion, som har en sådan konsistens, at den - foruden at dække overfladen - trænger ned i hullerne i filterdugen og fylder dem op.The product is outlined in FIG. 1 of the accompanying drawing, in which fig. 1a, 1b and 1c show the product viewed from above, from the side and from the end respectively. The process is carried out by immersing the hollow filter material - contained in "strips" of the appropriate width - in a plastic dispersion which has such a consistency that - in addition to covering the surface - it penetrates into the holes in the filter cloth and fills open them up.

Efter hærdning, hvorved plastdispersionen trækker sig sammen og sikrer filterelementets gode tætningsegenskaber trods høj t kulindhold, påføres den ene side af filterdugen en anden plastdispersion, 15 som efter hærdning muliggør varme- og/eller HF-svejsning af filterelementet til stomiposens folie.After curing, whereby the plastic dispersion contracts and ensures the good sealing properties of the filter element despite high carbon content, one side of the filter cloth is applied another plastic dispersion, which after curing allows heat and / or HF welding of the filter element to the film of the ostomy bag.

Filterdugen, der nu foreligger som lange "bændler" omsluttet og forankret af den gastætte plastdispersion, skæres ud i passende længder, den ene ende forsegles, og filterelementet påsvejses deref-20 ter indersiden af stomiposen som vist i fig. 2 og 3, der viser stomi-posen med filter set henholdsvis i snit og forfra.The filter cloth, now available as long "ribbons" enclosed and anchored by the gas-tight plastic dispersion, is cut to appropriate lengths, one end is sealed and the filter element is then welded to the inside of the ostomy bag as shown in FIG. 2 and 3, showing the ostomy bag with filter seen in section and front view respectively.

Sluttelig laves et hul af en bestemt diameter og dybde udefra gennem posevæggen og ind i filteret på oversiden, i nærheden af den forseglede ende, med en varm nål, som bortsmelter posefolien og plastdis-25 persionen, så der skabes luftgennemgang.Finally, a hole of a certain diameter and depth is made from the outside of the bag wall and into the filter on the upper side, near the sealed end, with a hot needle which removes the bag foil and the plastic dispersion to create air passage.

Fig. 4a viser den foretrukne udformning af filterelementet, hvor gassen fra stomiposens indre strømmer ind i "gavlen", der som eneste overflade ikke er dækket af gasuigennemtrængelig plastdispersion, passerer aksialt gennem filteret i hele dets tykkelse og bredde og 30 forlader filteret (og posen) gennem ét (eller flere) hul(ler) i dets modsatte ende. En anden mulig udførelsesform er vist i fig. 4b, hvor begge "gavle" er åbne for gas indstrømning, og udgangshullet (hullerne) er placeret midt i filterets overflade.FIG. 4a shows the preferred design of the filter element, in which the gas from the interior of the ostomy bag flows into the "gable" which, as its sole surface, is not covered by gas impervious plastic dispersion, passes axially through the filter throughout its thickness and width and leaves the filter (and bag) through one (or more) hole (s) at its opposite end. Another possible embodiment is shown in FIG. 4b, where both "gables" are open for gas inflow and the exit hole (s) is located in the middle of the filter surface.

Claims

Preferably, as the plastic dispersion for enclosing and anchoring the filter material, an ethylene-vinyl acetate / vinyl chloride copolymer is suitable, which is suitable for application and provides a gas-tight seal and which, after curing, can be both heat and HF welded. In addition, a polyethylene dispersion can be used which, however, can only be heat welded. 10 The ostomy bag with the internally welded filter - as shown in FIG. 2 and 3, are directly ready for use, in contrast to the loose filters that the user has to install on the outside of the bag, puncture a hole with a needle and mount a cover piece. Furthermore, an internally mounted filter has the advantage that the gas (see Fig. 4) can pass into the filter through a relatively large cross-section and flow out of one or more holes. For externally installed filters, the gas goes the opposite way. Here, it is essential to have a large inflow area for the gas inside the bag, since the liquid in the filled or partially filled bag, especially when the user is lying down, tends to stop the inlet of the filter 20 and thus disable it. In the case of externally mounted filters, the gas has access to the filter only through a hole, while as mentioned above for internally mounted filters, the gas has the entire cross-section of the filter element ("gable") as the inflow area. 25 The internally mounted filter is thus preferable, partly because it functions as a unit ready for use and partly because it is the most functional in situations with threatening clogging of fecal material.

A method of producing deodorizing gas filter elements, wherein in a filter material comprising a substantially flat matrix with a high content of finely granulated activated carbon, a plurality of closely spaced, through holes is formed, after which the outer surface of the filter material is applied. a coating of a plastic dispersion such that it is filled to fill the through holes, after which the plastic dispersion is cured, characterized in that the filter material is cut into strips and the plastic dispersion is applied to the filter material by the strips being immersed in the plastic dispersion and then each cut into filter elements by transverse sections.

Process according to claim 1, characterized in that one or more gas-through flow openings are formed in the middle part of each filter element in the plastic coating.

Method according to claim 1, 15, characterized in that the cut surface is sealed at one end of each of the filter elements and that one or more gas flow openings are formed at this end.