FR2476481A1 - EVENT DEVICE FOR ARTIFICIAL AND OTHER ORIFICES OF THE HUMAN BODY - Google Patents

Abstract

THE SUBJECT OF THE PRESENT INVENTION IS A VENT DEVICE FOR ARTIFICIAL AND OTHERS OF THE HUMAN BODY, INCLUDING A MATERIAL FOR FILTERING AND REMOVING ODORS AND MEANS FOR DIRECTING SUBSTANCES IN CONTACT WITH THE FILTERING MATERIAL. IT IS CHARACTERIZED IN THAT THE MEANS FOR DIRECTING THE GASEOUS SUBSTANCES ALSO INCLUDE SEALING ELEMENTS: - PREVENT A PASSAGE OF THE GASEOUS SUBSTANCES AT THE SURFACE OF THE FILTERING MATERIAL (IN PARTICULAR BETWEEN THE WALLS AND THE FILTERING MATERIAL); AND FORCING THE FLOW OF ALL OF THE GASEOUS SUBSTANCES THROUGH THE FILTERING MATERIAL OVER THE ENTIRE PATH BETWEEN AN INPUT FACE SUBSTANTIALLY DISTANCE FROM AN OUTPUT FACE.

Description

The present invention relates to improvements made

  post-surgical devices used to prevent the escape of

  gaseous, liquid or solid wastes from the artificial orifices

  surgically formed skies in the body of patients or out of anus

  5. Affected by insufficient sphincter control. More specifically

  firstly, the invention relates to venting devices for artificial orifices and other discharge ports for metabolic products.

out of the human body.

  A surgical operation such as a colostomy, an ileostomy, or a ureterostomy consists in forming an orifice, also called "meatus" or in Latin "stoma", in the wall of the intestine or urethra so as to constitute a channel establishing a connection with the outside

  the body through the wall and the patient's skin. The meatus

  means of communication between the intestine or the urethra and the ex-

  15. Interior allowing the evacuation of excretions such as

  feces or urine. Since, in this case, excretions can not

  not be controlled by the will in the same way as excreta

  by means of normal body orifices, it is necessary to

  The patient is wearing a sealing apparatus which may include a collection device. In fact, it is quite common that patients with a meatus wear an appropriate kind of "bag" or "pocket"

for the rest of their lives.

  The most widely used form of collection container is a bag or pouch made of a film or sheet of a transparent polymer and attached to the patient's abdomen using a double disc. adhesive side having a central opening coinciding with the meatus; the meatus may slightly protrude from the abdomen and engage

  in the central opening of the adhesive disc.

  In another embodiment, a flange formed of a relatively rigid material, such as a suitable polymer, is attached

  on the rear panel of the pocket, for example by heat sealing

  that and a seal is held between the collar and the skin of the patient, the pocket being held in position by means of a

strap attached to the collar.

  35. Faeces are collected more or less consecutively

  aunt in the pocket and, after a period of

  hours, we throw out the pocket and replace it with

another.

  However, the duration of the period of use of a given pocket is strongly influenced by the degree of flattance production.

that is intestinal gases.

  Different factors such as the nature of the consumed food products, the type of microflora and the psychic conditions affect the degree of production and the composition of intestinal gases. During a period of 12h, the quantity of gas can vary between 50 and 1000 ml,

  or even more. Generally, the volume of fermentation gas intestinal

  nal pass through the rectum is between about 400 and 1200 ml per

  10. day. We know that certain food products have a great influence on

  on the generation of intestinal gases.

  For example, ingestion of beans may increase average flow

  production of fermentation gas from 15 ml to 176 ml per hour.

  The quantity produced in fairly short periods may vary in

  15. wide limits and it is more particularly the fermenta-

  high flow rates that are difficult to deodorize and that may also pose the most problems for the patient. As a result, variations in the quantities and composition of the gases

  of fermentation create big difficulties.

  20. The composition of the fermentation gases depends in particular on

  the place of the gastrointestinal tract where they are produced. Stable gases

  macaux usually have a composition relatively similar to that

  atmospheric air, for example 78% N 2, 17% O 2, 3% CO 2. The fermentation gases contain an amount of oxygen of less than 2%, the

  25. Remaining gas consisting of variable proportions of nitrogen,

  of hydrogen, methane and traces of other substances.

  Thus, Keizo Kodama and Yoshiaki Miura gave in the document "J. Japan Soc. Food Nutrition 2", pages 149/152 (1949) the following composition

30. CO2 = 13 to 34%

CH4 = 19 to 26%

H2 = 20 to 27%

N2 = 17 to 48%

  The odoriferous gases contain indole, skatole,

  They are volatile and hydrogen sulphide and normally represent less than 1% of the fermentation gases. Of the above gases, hydrogen sulphide is the main constituent and is the most difficult problem to solve since it is easily detected by the nose

247648 1

  -3- of a human being in concentrations as low as a part for

million.

  The gases enter the drainage bag and they produce its expansion creating both practical and psychic difficulties.

5. for the patient.

  In practice, it has been attempted to unload the gases from the bag by perforating its upper part with a needle, the perforated part then being sealed again with the aid of an adhesive tape after the exit of the tubes. gas. However, because of the smell

  10. released by some of the gases and the discharge frequency of the

  this solution is totally unsatisfactory and can

  give rise to embarrassing situations.

  As a result, a formula of providing the

  a filter allowing the escape of gases.

  15. Another method of sealing the meatus or other artificial aperture

  surgically done in the body of a patient is to close it with a cap that is attached to the body substantially

  the same way as the drainage bag.

  A third, and even more important,

  20. seal the meatus with a stopper or other closure device that is inserted into the meatus and is held in position using

  a flange or a cover plate whose inside face

  re is in contact with the skin of the abdomen around the meatus. Such a boulevard

  The chon can be held in position by a magnetic force, with small permanent magnets then being sewn into the patient's body around the meatus by a surgical procedure. In this case, there is no drainage bag, but the faeces are removed from time to time by irrigation, for example every two days, after removal.

  the cap which is then put back in place.

  30. To prevent a build-up of pressure behind the cap (or behind the cover of the meatus), it was proposed to provide it

  a vent hole covered with several layers of a tex-

  nonwoven tile containing active carbon. In practice, however, the gases are not deodorized by passage through this filter, probably because the path followed by the gases in the filter is very short. As a result, this device can also give rise

to embarrassing situations.

  It can be seen therefore that the three known forms of devices

  of sealing of the meatus involve the insertion of a filter into a

  appropriate right of way followed by the gases. Different filaments are known

very much of this kind.

  Thus, in United States Patent No. 3,759,260,

  5. has described a filter consisting, on the one hand, of a disc formed of

  sintered carbons and activated granular carbon, one of which

  the inner side of the vent opening of the pocket and an area surrounding said opening and, on the other hand, an impermeable cover

  placed on the opposite surface of the disc so that the gases to be discharged

  10. ger radially traverse the disc from the periphery to the orifice

  vent positioned centrally with respect to the filter.

  This apparatus is not functioning satisfactorily, this being due to the short path followed by the gases and, which is perhaps

  more importantly, has a tendency to establish a flow of

  15. read, as will be specified later.

  A filter for the discharge of gas from skin pouches has been described in Danish Patent No. 130,277, the priority date of September 18, 1972 corresponding to that of the patent application filed

  in the United States of America under No. 290.149. The preferred mode of

  20. The invention described in this patent comprises a plane disc constituted by felted fibers and activated carbon in granular form. A surface

  is covered with a gas-tight material and has an ori-

  this central vent while the other surface of the disc is covered

  another layer of gas-tight material provided with several

  25. Offset from the center so that the gases to be discharged are

  wind an oblique and partly radial path through the filter.

  A similar filter has been described in Danish Patent No. 133,080 whose priority date of September 27, 1973 corresponds to that of the United States Patent Application Serial No. 30,401,337. In this patent, one of the impervious coatings comprises a

  vent port while the opposite coating has several

  sieur vent holes spread evenly over the entire area of the disc. The filtering devices of known types are similar in that they all comprise a plane disc constituted by felted fibers and activated granular carbon, this disc being covered on its two opposite sides by impermeable materials and being provided with Requirements for discharged gases to pass in a more or less radial direction through the filter, i.e. following a path longer than the thickness of the disk. The purpose of this structure is to use the activated carbon capacity more efficiently

  to absorb the odorous constituents of the intestinal gases.

  5. However, in practice, the known filtering devices do not replace

  the intended function and their length of service is not satisfactory, so that

  embarrassing; also, it is necessary to provide for

  filters and the active carbon used is not

  10. severely exploited, which translates into a financial loss.

  It is estimated that one of the reasons for the unsatisfactory functioning of

  known filters is a result of the strong trend towards the estab-

  channeled during the passage of gases. The filter disk is formed of a relatively rigid material. The gas-tight coatings are formed from thin films or sheets of plastics for which no special precautions are taken to establish a stable gas-tight contact with the surfaces of the disc. As a result, the path formed axially through the filter and then along a channel existing between the filter disc and the coating 20 to the orifice or to the vent orifices (or conversely, first the along a channel existing between the filter disc and the coating and then, axially, through the filter) offers much less resistance than the path oriented radially or obliquely through the

  disc, so that the gases preferentially follow the first

25. jet.

  Another reason for the unsatisfactory operation of the filters

  This is attributable to the irregularity of production and composition of intestinal gases. If the absolute quantity of odoriferous substances to

  evacuate remained fairly constant during the day, we could use

  30. a filtering material, eg active carbon, in quantity

  corresponding to the quantity of odoriferous gases and the geo-

  metric of active carbon would be relatively unimportant. How-

  because the quantities and composition of intestinal gases

  vary within very broad limits, it is impossible to use

  35. the entire active carbon mass, and the geo- graphical profile of

  metric of the device becomes more important.

  It is therefore an object of the invention to overcome the drawbacks resulting from the channelized flow forming effect occurring

2476 48 1

-6-

  in known filters and relates to a venting device

  ble in sealing devices of the meatus or other openings, for example, bags, bags and mouthpieces, to ensure that gases do not pass through the unpurified device

  5. Vent through non-absorbent parts of the latter.

  In particular, the object of the invention is to provide a filter

  in order to allow optimum use of the active ingredient

  contained in it, that is to say

  the geometrical structure of the filter so that a quantity

  10. filter material not greater than previously used

  to remove odors from intestinal gases even in the

  of maximum production of said gases and for maximum levels of

smelly components.

  Another object of the invention is to provide a filter or

  15. vent hose that can be properly fitted on pockets or bags

  disposal of waste from meatus or other artificial orifices

  made by surgery in a human body and which can be

  in the form of a separable element that can be used during

  an extended period of time that can be transferred from a pocket or.

  20. shutter of meatus on another.

  It is an important object of the invention to provide a vent device having a filter and which is easy and inexpensive to manufacture-to

  from materials conveniently available.

  Another object of the invention is to provide a filter device

  25. The invention relates to a trilogy and venting device of the aforementioned type, which is of safe operation and which allows the escape of unpleasant gases from a meatus or other artificial orifice or from an anus that functions poorly,

  the discharged gases being free from any smelly components.

  The invention also aims to provide a filter device

  30. trage and vent of the aforementioned type which avoids the condensation of water vapor inside the filter thus allowing an extension of

its service life.

  The invention therefore relates to a device for ensuring the venting of meatus or other orifices, artificial or not, discharge of metabolic products of the human body, this vent device being arranged to be placed directly or indirectly in close proximity to the human body and the meatus or other orifice of the body and having a dimension perpendicular to the human body which is less than at least one dimension parallel to the body, said venting device containing a filter material and odor removal which is placed between

  gas-tight and liquid-tight walls by forming

  finished for gaseous substances, said filter material being traversed by gases along a path longer than the dimension of

  filter device that is perpendicular to the body.

  With such a device, the objectives of the invention are achieved.

  when the gastight and liquid-tight walls are in

  perfume essentially gas-tight with the filter material 10. and odor removal, the gas discharge part of the device

  in the surrounding atmosphere being placed in relation to the entrance

  killed between the meatus or other orifice of the body and the thread material

  so that the path followed by the gases through this

  has a length at least equal to five times its minimum dimension.

  15. The gas-tight contact established between the walls and the filter material prevents the flow channel effect and it can

  be obtained with both granular and pulverulent filtering

  such as, for example, granules of active carbon and with a filter material in the form of a body, for example, a material of the foamed or paper type, which is impregnated with a substance of removing odors such as active carbon or another

  chemical compound, as well as with an appropriate porous substance

  by itself as a matter of odor removal. Geometry

  of the device, that is to say the fact that the path followed by

  25. The gas has a length at least five times greater than its half

  the gases are forced to come into contact with a large mass of the filtering and odor removal material, which in the first place results in a more efficient use of the material and in the second place, by the fact that a sudden increase in the amount of gas or their content of malodorous constituents does not produce bad odors in the surrounding atmosphere and

  therefore creates no embarrassing situations.

  According to the invention which concerns preferably plugs

  but which can also be very useful for pockets and ob-

  35. the material of filtering is distributed in the form

  an essentially flat disk with a hole in its middle part.

  The flat sides of the mass of filter material are in water contact

  the gas-tight walls with gas-impermeable walls, while the edges of the inner hole and the outer periphery of the disk are at least partially free to allow entry and

the escape of intestinal gases.

  In this respect, the correct length of the path followed by the gases is 5. established by the fact that the width of the disk or ring, that is to say the radial distance separating the hole from the outer periphery, is

  at least five times the thickness of the filter material disc.

  According to one characteristic of the invention, the filtering material

  and odor removal is constituted by a disc of annular

  10. re (which will be hereinafter also referred to as "ring") so that the gas inlet in the filter is effected on the edge of the central opening while the discharge of the purified gases is effected on the edge of the outer periphery of the ring, means being

  designed to prevent a direct escape of gases through the central opening

  15. trale; the flat surfaces of the ring are in gastight contact with walls or covering layers and the radial width of the ring is at least five times its thickness. This ring can be arranged in different ways. In a very advantageous way, the central opening of the ring has a diameter slightly greater than

  20. that of the meatus or artificial orifice of the human body. The device for

  The wind can be placed around the meatus and connected to a sealing device.

  it, preferably a bag or shutter meatat. When used with a meatus bag, the inner covering layer or wall (i.e., closest to the patient's skin) may be attached to the filter with an adhesive, by preventing leakage of fluid between the skin and the filter when the device is "glued" to the human body around the meatus. The wall or outer skin is also

  stuck on, or secured to, the meatus bag so that its original

  Entrance fee coincides with the central opening of the ring. Gases 30. as well as solids and liquids can pass directly

  of the meatus in the ring through the central opening. This-

  during, a pressure increase is prevented because the gases can escape via the filter material due to

  that its free outer edge is located between the skin and the bag. The man

  35. filtering system removes odors and allows the passage of non-disruptive gases. When the vent device is connected to the bag using

  adhesive, it can be removed from the bag and placed on another

  that the filter material is worn, which allows for savings. Also, the structure of this embodiment is

  very simple and it consists of relatively inexpensive materials.

  This means that it is of economic use, which is an important advantage because patients who have been

  artificial orifice surgery or who suffer from other insufficiency

  these must always use a sealing device of some kind. The venting device can of course be placed on the other side of the meatus bag, i.e. on the side which is remote from the torso; in this case, the central hole of the filter can have any desired size and

  it is often smaller than the meatus opening.

  This embodiment is particularly suitable for magnetically held meatus pads and provides a solution.

  15. very elegant problems concerning the reduction of pressure

  in the intestines and meatus in cases where the meatus is obstructed

re by such a buffer.

  So far, it has not been possible to develop a safe filter for such buffer vent devices, and it has been found that it is necessary for some degree to discharge gases. intestinal non-purified. Thanks to the invention, the embodiment

  annular shape allows a continuous and very safe discharge of

  non-odoriferous and purified testins, even in cases of

  production of such gases, for example after a meal.

  25. A cushion of meatus or other artificial orifices of great interest

  part of the meatus and a solid flange

  of this part or connected to it and whose inner face is in contact with the skin around the meatus so as to establish a hermetic seal. According to the invention, the ring constituting the vent device 30 can be placed so that its central opening surrounds the buffer itself with a certain clearance so that the gases can

  pass along the buffer in the meatus, penetrate into the filter

  flowing on the edge of the opening and out of the filter passing on its circumferential edge. The inner face of the filter (that is to say

  35. the one closest to the human body) is in contact with

  with a cover portion itself gas-tight; this part can be fixed by an adhesive on the side facing the filter

  and possibly also the side facing the skin around the meatus.

2 4 76 48.1-

-10-

  The outer face of the filter is directly or indirectly

  gas-tight tact with the inner face of the tamper collar

  pon. It is thus ensured that the intestinal gases can not

  to escape without passing through the filtering material. It may even be possible for the skin to play the role of one or other of the layers

  covering the filter ring.

  The opening of the ring can be placed eccentrically with

  that the shortest possible gas flow distance is still five times the thickness of the filter material. This is not strictly necessary, but it is usually preferred to adopt this relation so that the entire edge of the opening ensures the admission of the gases, or that the entire outer edge allows them to escape. A portion of said edges may be closed by waterproof material

to gases.

  15. The thickness of the filter material may vary within wide

  limits. Usually it is between 0.8 and 8.0 mm, and

  substantially between 1.5 and 3 mm. The ring preferably has a shape

  essentially circular and has a central opening cir-

  lar. Its outside diameter may vary between 3 and 10 cm and it is advantageously between 6 and 7 cm. The inner opening has a

  diameter between 0.5 and 2 cm, preferably between 1 and 1.5 cm.

  The ring has a width (outer diameter minus inner diameter) of

  the order of 2 to 3 cm, preferably about 2.5 cm.

  When using the embodiment comprising a channel, it is

  25. It is appropriate to choose for this channel a diameter of 2 to 5 mm, preferably

from 3 to 4 mm.

  When the venting device is arranged as described above by being provided with an annular profile filter, the latter must have a body structure instead of being in the form of particles.

  More or less free because it would be difficult to prevent these

  ticules to fall. This body could obviously be made using a membrane made of a certain porous material, but

  would result in an increase in cost and would not be

  particular age; on the contrary, in the first main mode of

  35. As described above, there would be no increase in cost

  covering the ends of the channels with such a porous material.

  It may be convenient to use two or more filtering materials

* placed concentrically, but this is usually not necessary.

-11-

  A very effective filtering material for removing odors is

  tituated by active carbon. In the two main modes of

  tion of the device according to the invention, it is possible to distribute the active carbon

  in granular form in a fibrous material. It is then interesting

  5. to use cellulosic fibrous material in the form of

  a woven or non-woven fabric structure or a material

cottony or wadded.

  However, it is believed that the filtering and odor removal material may be best constituted by an element

  10. A filter comprising an elastic cell matrix with open cells

  which has been impregnated with an active carbon dispersion in a binder. Elasticity helps keep the different contact surfaces in place to minimize the risk of leaking unsplit gas. The binder ensures that no channels 15 are formed which have no active carbon inside the filter; the filter is easy to handle and can easily be given any desired shape. Such impregnated elastic foam is very suitable for all the embodiments described above and it

  is particularly suitable for the filter rings described above.

  20. The binder may be a latex or a dispersion of ethylene and acetylene.

  vinyl acetate, a styrene-butadiene latex or an acrylic latex. It may also consist of a solution of a suitable polymer or copolymer. Active carbon can also be distributed

in the polymer itself.

  25. Instead of cellular foam or cellular matrix

  open is impregnated with the active carbon, it can be realized in.

  a polymer containing a high amine content or can be impregnated with an amine. Such amines, for example in the form of urethanes, are effective removal substances

30. odors.

  When the device has an annular shape, the wall or covering layer provided on the side of the ring that is not in contact

  with the human body can extend to the central opening of the

  water and seal it tightly; such a structure can be placed directly on the outer wall of a meatus bag or it can

  constitute the upper part and the flange of a meatus pad.

  The gas-tight contact established between the filter material and the walls or cover layers can be achieved by adhesion. In a very convenient manner, the two gas-tight cover layers are provided with adhesive on both sides so as to serve as connecting members between the body, the filter element and the bag.

  of the meatus or the flange of the meatus pad.

  5. When the device is made in the form of a ring, the layer of

  gastight covering provided on the inner surface (ie

  body oriented) may include an opening

  a larger central core of the filter disk and the other gas-tight cover layer; it is, of course, necessary that the narrower ring has a width of at least five times

  the thickness of the filter. This embodiment has a large

  gas inlet and is particularly suitable for use in cases where a high volume

gas.

  15. The gas-tight contact between the filter element and the

  lerette when the device is used in a ring of meatat, can advantageously be achieved by magnetic elements, like this

  will be specified later.-The gastight contact between the different

  elements may also be established by elastic forces,

  20. as will be explained also in the following description.

  Other advantages and features of the invention will become apparent

  on reading the following description and the attached figures,

  for illustrative but not limiting purposes.

  Figure 1 is a section of the torso of a person wearing a meatal pouch which is provided with an embodiment of the device.

vent according to the invention.

  Figure 2 is a partial section of a person carrying a bag

  with another embodiment of the vent device se-

the invention.

  30. Figure 3 is a partial section of a third embodiment of

  tion of a vent device according to the invention.

  Figure 4 is a section of a person with a meatus, in

  which is inserted a buffer provided with a vent device according to the in-

vention.

  35. Figure 5 shows a part of Figure 4 on an enlarged scale

  die. Fig. 6 is a sectional view of a portion of an embodiment

  of the vent device according to the invention.

-13-

  Figure 7 is a sectional view of part of another embodiment of

  tion of the vent device according to the invention.

  Figures 1 to 7 have been shown, for reasons of clarity of design, as slightly exploded views. In reality, there is

  5. no gaps between, for example, elements 1, 3, 4 and 5.

  As shown in FIG. 1, a pocket or bag of meatus 6 is

  on the chest 1 of a person with a meatus (or Latin stoma)

  or artificial orifice 2 which has been made by a surgical operation

  down. A vent device arranged according to the invention is placed between

  10. the patient's skin and pocket. This vent device comprises a disc

  gas-tight annular ring 3 which consists of an adhered polymer

  sive. The disk has a central hole that fits more or less closely around the outer opening of the meatus. One side of the disc 3 adheres to the person's skin and therefore completely or partially serves as a support for the meatus pouch. The other side of the disc adheres to an annular filter element 4 which includes an odor removal material. This filtering element 4 has a radial width at least equal to five times its thickness (twenty times its thickness in the embodiment shown) and it may, for example, consist of a commercial filter paper which has been

  impregnated with active carbon. In a preferred embodiment, the

  The ring-shaped filtering device consists of a polyurethane foam

  an open-celled, elastic mother that has been impregnated with active carbon or contains this substance. On the other flat surface of the element

  25. 4 is fixed another annular disk and gas-tight which is constituted

  killed with an adhesive polymer; it ensures the connection of the filament element

  4 and the pocket 6 whose inlet opening is aligned with the central openings of the rings 3, 5, the filter element 4 and the meatus 2 when placed in the service position. Substances

  30. liquids and solids from meatus 2 may enter the

  6 through openings in annular elements 3, 4 and 5. Intestinal gases or gases produced by

  liquid and solid substances can escape through

  diary of the venting device; they enter the filter element

  35. annular shape via its inner periphery,

  they propagate radially through the filter and come out through its pe-

  outer rim. Because the annular disks 3 and 5 are adhesive, it is ensured of a sealed contact between them and the filtering element 14 and also of a sealed contact with the skin of the

  Patient 1 and pocket 6. The gases can only escape

  to-the filter; because this filter contains a material for removing

  odor and the fact that its dimensions provide a long path 5. of gas flow through this material, it allows to effectively remove malodorous constituents of gases so that only

  non-disruptive gases actually exit the device.

  In Figure 1, the filter element is placed between the pocket and the skin of the patient. It could be placed on the outside of the pocket 6, in a position away from the patient's body. It would then be necessary to provide appropriate means for fixing the bag directly on the body so that its inlet is aligned with the meatus; the opposite side of the bag has an orifice aligned with the central hole of the filter element 4, the latter being fixed on the pocket. The outer face of the filter element would be in gas-tight contact with a disc made of a gas-tight material, for example a plastic film covering both the ring-shaped filter.

and its central opening.

  However, the position shown in Figure 1 is the most

  20. because it has been found that, although the intestinal gases are saturated with water vapor, no condensation of vapor occurs

  of water inside the filter element. On the contrary, it is different

  to avoid this condensation in a filter placed on the colder outer surface of the meatal pouch, and

  25. serious alteration of the operation of the filter.

  Although no particular means is provided to prevent the liquid collected in the bag from entering the filter element, it has surprisingly been found that it remains dry and active.

for long periods.

  30. Nevertheless, if the material collected in the pocket contains large quantities

  quantities of water or if there are other special conditions

  res, it may be advantageous to use the embodiment

  Figure 2. In this figure, we have again designated by 1

  the torso of a person with a meatus 2 or other

  35. ficial. An annular inner adhesive disc 3, an annular filter disc 4 and an outer adhesive disc 5 of shape

  annular link between the patient's chest 1 and the

  This connection is gastight but allows gases to escape through the odor removal material from the inner edge to the outer edge of the disc. However, in this case, the inner edge of the filter element 4 is covered

  by a film 7 of a hydrophobic and gas-permeable material (e.g.

  5. ple, the material sold by the Company "Du Pont de Nemours", under the name

  commercial sign of "Tyvec"). The film 7 "Tyvec" is fixed by gluing or welding on the inner part of the adhesive rings 3 and 5. As shown in Figure 2, the meatal pouch 6 is arranged to 10. be fixed on the filter assembly 3, 4, 5, 7 through a flange 14. This flange 14 can be used to give greater freedom of movement of the meatal pouch. It can also be used when the meatus pouch is attached to the patient's torso with a strap. The vent device shown on

  15. Figure 2 can however be used without this flange 14.

  It is obvious that in service there is no gap between the torso 1 and the ring 3, between the rings 3 and 4 or between the rings 4 and 5, or between the ring 5 and the pocket 6 ( figure 1) or

  the flange 14 (Figure 2). The same consideration applies to

20. very figures.

  FIG. 3 is a cross-section of another embodiment of a filament

  can be used in conditions where there is a large amount of water on the bag or in other particular conditions.

  references 3, 4 and 5 refer to the same elements as those on the

  25. FIGS. 1 and 2, and an inner ring formed of a hydrophobic and gas-permeable material such as "Tyvec" or an

  hydrophobic plastic foam with open cells.

  FIG. 4 is a section of the torso 1 of a patient with a

  2 closed by a magnetic pad 11. By a surgical operation

  30. wedge, a permanent magnet in the form of a ring coated with a suitable plastic material 12 has been placed around the meatus 2. This ring

  attracts and holds the pad 11 which contains another magnet or se-

  of magnets (not shown). Under the effect of the attractive forces produced between the magnet (s) 12, 11, a cover plate

  35. 10, which is part of the buffer 11, is applied against a gasket

  9 which prevents leakage of fluids from the meatus. With this type of gate shutter, the generation of a pressure generated by

  gut gas gathering in the meatus poses a particular problem.

994 76 48 1

  -16- difficult to solve. The gas pressure pushes the gasket off the gasket even if it is attached by adhesive and leaks. For this type of meat shutter, the device

  according to the invention is particularly useful.

  5. FIG. 5 is a detailed half-section of a seal 9 arranged according to the invention and comprising a filter which allows the intestinal gases to leave the meatus without producing unpleasant odors.

the surrounding air.

  An inner disk 3 of annular shape and consisting of a

  10. Gas impermeable barrier is arranged to be kept in contact

  tight against the skin under the influence of magnetic forces. The an-

  3 is in sealing contact with a ring-shaped filter disc 4, which has for example a structure similar to that of the disc

  Figures 1 and 2, which is therefore also in contact with

  15. che with an outer disc 13 impervious to gases and which is formed of an adhesive material or which is provided with an adhesive on both sides.

  The radial width of the joint 9 is at least five times the

  thickness of the filter ring 4. The disc 13 is not absolutely

  Necessary because the cover plate 10 can play by itself.

  even the role of the gas-tight cover. It is, however,

  to use the adhesive disk 13 because it positions and holds the filter disk in place when the buffer is opened in order to

  evacuation of faeces.

  25. The ring 3 may be a flexible and soft lining and, where

  it can also be adhesive to achieve the safety of

ximale against leaks.

  Figure 6 shows a cross-section of another seal of

  suitable for use with the magnetic pad 10, 11.

  30. References 3, 4 and 13 have the same meanings as on the

  FIG. 7 is a "Tyvec" ring which extends over the inner edge of the filter disk 4. This "Tyvec" disk or another

  hydrophobic and gas-permeable material shall have an outer diameter

  smaller than that of the disc; the radial distance between his

  35. outer rim and its inner periphery must be at least five times the thickness of the filter disk. It goes without saying that there must be a gas-tight contact between the filter ring 4

  and the ring 3 when the ring "Tyvec" 7 does not exist.

  Figure 7 shows a sectional view of another filter assembly suitable for use with both a magnetic pad and a

  pocket of meatus. In this case, one of the impermeable cover sheets

  3 has a larger central opening than the

  5. filtering 4, which increases the section of passage through which

  the gas can penetrate inside the filter element 4. Egale-

  the three rings must be in gastight contact with each other and the radial width of the cover ring 3 with the largest central opening must be at least

  10. five times the thickness of the filter ring.

  If necessary, the complete filter element can be impregnated

  partially or with a hydrophobic agent such as a fluorescent polymer

d or a silicone.

  It is obvious that, where appropriate, it is not necessary to

  15. to give the filter homogeneous properties throughout its entire periphery

  around the meatus and can, for example, be given a gas impermeability property only on a fraction of the periphery

of the meatus.

  We will give in the following some examples of application of

  20. the invention which are not absolutely limiting thereof.

EXAMPLE 1

  A pouch-pocket formed of polyvinylidene chloride and comprising

  as a collar on its back side was provided with an element of

  filtering having the general structure indicated in FIG.

  25. The filter element (4) was made from a foam of

  open-cell polyurethane, 3 mm thick,

  17 kg / m3, which has been impregnated with a slurry of

  active carbon in a binder containing a dispersion of a polymer of

  thylene and vinyl acetate. The impregnated polyurethane foam has a density of 48 kg / m 3 and its active carbon content has been

37% by weight.

  The gas-tight annular discs 3 and 5 have been made

  drawing a self-adhesive polymer composition on both sides which adhered tightly to the filter element 4 to thereby prevent

  35. a channelized flow formation.

  The effectiveness of the meatus pouch on a male patient was checked.

  having encountered difficulties because of the large volume of

  testinal products. The patient carried the pouch for 28 hours and, during this period, the intestinal gases were discharged

  continued and found to be completely odor free.

  When the patient used a pouch with a filtering device according to United States Patent No. 3,759,260, he complained that the venting device was not able to deodorize the gases. intestinal as quickly as they were produced and it is

  returned to a vent device according to the invention.

EXAMPLE 2

  A patient having a meatus closed by a magnetic pad of

  10. The type shown in Figure 4 complained of a leak around the buffer.

  Various sealing materials and gaskets have been tried.

  known but the seal was leak-tight only for a short time

  at the end of which feces began to flee. The magnetic pad was then provided with a filtering device having the

  15. The structure shown in Figure 7. A filter element was used.

  an active layer of flexible polyurethane foam with open cells.

  and impregnated with active carbon. We adopted for the overall density

  a value of 60 kg / m3 and the carbon content was 29% by weight.

  The gas-tight outer disc 13 was made from a

  20. The self-adhesive liner on both sides and the gas-tight inner disk was formed of a material containing about 50% of a viscous polyisobutylene matrix and about 50% of a hydrophilic filtering powder containing gelatin, sodium carboxymethyl cellulose and powdered pectin. The outer diameter of the device 25 was 60 mm and the diameter of the central hole in the ring 4 and in

  the adhesive disk 13 was 10 mm whereas it was adopted for the dia-

  meter of the hole provided in the inner lid 3 a value of 14 mm.

  With this filtering device the buffer has remained waterproof for

82 hours.

  30. It was found that intestinal gas was completely

  dyed and unloaded as quickly as they were produced and there was no leakage of faeces. The buffer was opened three times during this period and the feces was removed by

  enema of the intestine. When the buffer was reinserted, it was found that

  35. that the seal was still perfect.

EXAMPLE 3

  In an experiment carried out at the University Clinic Erlan-

  gen, FRG, nine patients with meatus and all of whom have difficulty

-199-

  leakage of smelly substances occurs.

  around their magnetic channel pad when using

  seals of known types have been provided with

  vents such as that of Figure 7; eight of the nine patients

  5. have not encountered any difficulties, that is to say that intestinal gases

  have been unloaded in a controlled manner through the filter and

  that he did not pose any problems of leaks or odors. -

  In a similar experiment carried out by Dr. H. Feustel at the University Clinic of Giesse, FRG, nine patients from one

  10. Group of ten no longer had difficulties with their meatus.

EXAMPLE 4

  A magnetic meatus pad has been fitted with a venting device

  arranged as shown in Fig. 6. The filter element

  age 4 from a filter paper impregnated with active carbon. We realized

  15. se the gas-impermeable outer disc 13 from a styrene-isoprene-styrene rubber sheet and the inner disc 3 to

  from a sealing material containing a polyisobut matrix

  viscous tylene combined with a hydrophilic filter containing a mixture of starch, gelatin and pectin. The gas between the disk 13 and the filter element 4 has been made gastight by magnetic forces holding the pad in place in the meatus. This buffer was tested on a patient whose meatus had never before been made free of leaks or odors. With the new venting device, he no longer encountered any difficulties resulting from leaks and gases

  Intestinal exiting the filter element have been completely

  dorisés. After 29 hours, the buffer was removed:

  that the filter element was still active but that the disk

  3 had inflated enough intestinal fluids so that the passage between the inner edge of the disk and the buffer 30 (11 in Figure 4) is closed. It is still possible to improve the function of this venting device by increasing the diameter of the central hole of the disc 3, as shown in FIG. 7. In this experiment, a value of 1/40 was chosen for the ratio between thickness of the filter element and the radial path connecting the central hole

35. at the outer edge.

EXAMPLE 5

  To study the influence of physical dimensions on performance

  of the active filter element, the following experiment was performed:

boast -20-

  A flexible cell polyurethane foam was cut out

  green leaves of 3 mm thick. The active carbon sheets were impregnated in a binder containing a vinyl copolymer dispersion. The dried leaves were found to contain 28% by weight

  5. Carbon and had a density of 55 kg / m3.

  Rectangular discs were cut into a sheet. The sur-

  In all cases, the diameter of the discs was 4.5 cm 2 and the values indicated in the following Table I were chosen for the length and the width.

10. - TABLE I -

  15. 20. Each of the disks was covered with an impervious adhesive tape 25 to the gases on the upper face, on the lower face and on both sides, while the two remaining sides were sealed on small tubes of material. plastic to allow the flow of gas through the inlet tube through the disc in its longitudinal direction and its output through the outlet tube. 30. The inlet tube was connected to a tank filled with a test gas under

  the atmospheric pressure. The outlet tube was connected to a tube of

  plate containing a lead salt and graduated to indicate the

  amount of H2S existing in the gas passing through the tube. The other -

  end of the detector tube was connected to a standard suction pump

  35. able to pump precise volumes of test gas from the

  see and through the filter element and the tube detecting

  tor. A mixture of 80% nitrogen and 100% nitrogen was used as the test gas.

Viron 20% methane, to which 25 ppm of H2S was added. During the ex-

  Filter NO Length Width Thickness Length (mm) (mm) (mm) Thickness

1 3 22.4 22.4 0.1

2 10 15 9 1.1

3 15 30 3 5

4 30 15 3 10

45 10 3 15

  The H 2 S was not absorbed by the filter element and reacted with the lead salt in the detector tube.

  This has allowed direct reading of the amount of H2S.

  Since in practice patients with a meatus face the greatest difficulties in the sudden discharge of large volumes of intestinal gas, the gas flow rates have been varied to find the

  most efficient filter sizes at high flows of corre-

responding to this situation.

  The results of the experiment are shown in Table II,

  10. below. It can be seen that the filter No. 1, where the gas flows perpendicularly

  the plane of the filter element is the least effective. Me-

  For the minimum gas flow, the% yield is never attained and when the flow rate increases, the yield decreases rapidly (the

  yield is the percentage of H2S absorbed by the filter).

  15. Filters Nos. 3, 4 and 5 all have high yields for low flow rates, even after a total of 500 ml of gas

  test passed through the filter elements. For higher flow rates

  The efficiency of the filters decreases, but even for a flow rate of ml / min, the filters Nos. 4 and 5 retain a yield of 83% after

  20. passage of the first 300 ml of gas and 72% after passage of 500 ml.

  Filter # 2 has never, although being significantly better than filter # 1, a 100% yield and is more sensitive to

  increased flow and volume than filters nos. 3, 4 and 5.

  It is therefore seen that, in order to obtain a good output at high flow rates for a large total capacity, the venting device must be designed to have a gas path through the filter element which is considerably longer (at least

  five times) than the minimum dimension of the filter element.

2476481 -

-22-

- TABLE II -

  Efficiency of filter elements as a function of flow rate Gas flow (ml / min) 10 20 50 100 200 5. Oil filter Efficiency Yield Yield Yield Efficiency Total filter N0 ml%%%%%

98 90 77 60 20

25

10. 1 300 97 84 66 47 27

400 30

500 95 69 55 44 32

15. 100 99 94 91 80 58

2,300 99 92 78 59 42

500 98 85 70 55 40

20.

100 100 96 89 60

100 100 92 80 55

3,300 100 98 84 70 50

400 100 98 79 67 45

25. 500 100 96 78 67 44

100 100 100 96 80

100 100 100 90 70

4,300 100 100 93 83 60

30. 400 100 100 90 77 56

500 100 99 89 72 52

100 100 100 100 86

100 100 100 91 70

35. 5 300 100 100 98 83 65

400 100 100 90 77 55500 100 99 90 72 55

2 47648!

-23-

EXAMPLE 6

  A test gas containing nitrogen, methane, hydrogen, carbon dioxide, and 25 ppm H 2 S was passed through a commercial web seal manufactured by Hollister Incorporated.

  5. and subject of Danish patent No 133.080. We then did not

  venting gases from the venting device into a detector tube and

  measured the total amount of H2S passing through the venting device.

  After passing 400 ml of the test gas, an equal reading was obtained

  at 5. After the 600 ml pass, the recorded value increased

  10. At 15 and we stopped the experiment.

  In a similar meat shutter, the filament element was made

  gas-tight tread.by applying it against plastic closure sheets secured with an adhesive so that the gas

  must flow from the edge to the vent hole through the

  15. Filter element, which effectively prevented the effect of channeled flow. The test gas has now been passed through the venting device. After passing 400 ml, a value of zero was obtained. After 600 ml, a value of

7.5 and the experiment was stopped.

20. EXAMPLE 7

  A pouch of meatus formed of two rectangular leaves has been provided.

  plastics material, sealed around the edges, with a venting device consisting of a flat filter element measuring 15x30x3 mm, consisting of felted cellulosic fibers and containing granules

  25. active carbon purposes. The filter element was placed in a small

  envelope made by sealing a sheet of plastic material

  than that of 22 x 40 mm on one of the sheets forming the pocket of

  meatus. It was realized in the two sheets surrounding the filament element

  trilling an inlet hole and an outlet hole so that the gas to be discharged is forced to flow along the length of the filter element. In another pocket of a similar structure, gastight contact has been established between the filter element and the

  closing walls with an adhesive.

  35. The capacity and performance of the two devices were compared

  by passing them through a test gas containing H2S.

  The results obtained are shown in Table III below.

- 2476481

-24-

- TABLE III -

  The results clearly show that there is considerable room for improvement

  the efficiency by placing the filter element in contact with

  gas tight with the surrounding walls.

EXAMPLE 8

  15. In another experiment, the vent device described in the example given above was attached to a meatus pouch using a self-adhesive disc so that intestinal gas collected in the pocket may be discharged into the atmosphere through the venting device. In use, the meatus pouch collected the solid and liquid feces produced in the intestine while the intestinal gases were deodorized and discharged through the venting device. After a normal period of service of 10 hours, the bag was removed and discharged from the collected material, and the vent was transferred to a new bag which was placed on the bag. meatus. After three weeks of continuous use, it was found that the vent device was working

  satisfactorily and that the patient had no problem

me of smells.

  The invention having now been exposed and its interest justified on detailed examples, the Applicant reserves the exclusivity for the entire duration of the patent, without any limitation other than that of the

  terms of the claims below.

  5. 10. Volume Yield% of non-contact sealed with leaktight contact test gas with caz to az ml / min 100 ml / min 50 ml / min 100 ml / mn

100 100 100 100

100 90 100 96

300 93 66 95 84

400 83 53 92 80

500 66 52 89 72

-25-

Claims (63)

-R E V E N D I C A T IO N S-   1. Device for venting meatus and other orifices, artificial or   no, the discharge of metabolic products from the human body,   discharge of gaseous substances, said device comprising   5. nant: - a filtering material and odor removal - means (including walls) for directing gaseous substances in contact with the filter material said device being characterized in that: 10. said means for directing the gaseous substances further comprise sealing elements: preventing a passage of gaseous substances on the surface of the filtering material (in particular between the walls and the filter material), and forcing the flow of the all of the gaseous substances through the filter material over the entire path between a substantially remote input face an exit face.   2. Device according to claim 1, characterized in that   20. - The sealing elements are composed of an adhesive material   gas-tight, extending over the entire surface of the   filtering area except the input and output faces distant from each other.   3. Device according to claim 2, characterized in that said means 25 for directing the gaseous substances in contact   filtering material comprise sealed walls; the-   said walls being secured to the filter material by   the adhesive material preventing a superficial passage of   these gases between the filter material and the sealed walls 30. 4. Device according to claim 2, characterized in that - the adhesive material, gas-tight, is also the means   to direct the gaseous substances.   5. Device according to any one of claims 1 to 4, characterized   characterized in that: - the path length followed by gaseous substances between the inlet face and the exit face of the filter material is at least five times the minimum dimension of said filtering matter. 2 4 76 48 1   -26- 6. Device according to claim 5, characterized in that   - the minimum dimension is less than 3 mm.   7. Device according to any one of claims 1 to 6, characterized in that:   5. - the sections of the input and output faces are in a   such as the speed of gas flow through the   filter decreases from input to output.   8. Venting device for meatus and other orifices, artificial or   no, the discharge of metabolic products from the human body,   10. discharge device gaseous substances, said device being characterized in that it comprises: - a filtering and odor removal material, composed of a cellular matrix, elastic ,. open-celled, impregnated   with an active carbon dispersion in a binder; said machine   15. Filtering sponge extending on the shape of a wafer whose thickness is less than 3 mm; said filter material being pierced at its center, from one side through an opening; - two watertight walls to direct the gaseous substances since   an entrance face consisting of the edge of the central opening   20. tral to an exit face consisting of the outer edge   upper of the filter material wafer one of the walls extending on one of the faces of said wafer, including the opening;   the other wall being composed by that of the pocket of   25. the receptacle on which the device is intended to be   after arranging an orifice aligned with the central opening of the wafer so that the gases penetrate perpendicularly into said device, through the central opening, 30. and then pass through the defiltering material in a centrifugal path, parallel to the pocket, having a length greater than the thickness of the wafer - an adhesive material extending over both surfaces of the wafer for: on the one hand, preventing a superficial flow of gases between the walls and the filter material and forcing the flow of all gases through the filter material over the entire path between the input and output faces; On the other hand, to secure the filtering material with the two walls;   the dimensions of the wafer of filter material being such   the path followed by the gases through this material   5. has a length at least equal to five times its thickness.   9. Device for venting meatus and other orifices, whether artificial or not, for discharging metabolic products from the human body, arranged to be placed directly or indirectly in close proximity to the human body and the meatus or other orifice of the human body and having a dimension perpendicular to the human body that is less than at least one dimension parallel to the body, which venting device contains a filtering and odor removal material which is placed between the gastight walls and to the liquids by forming defined passages for gaseous substances, the filter material being traversed by gases in a longer path than the dimension of the filtering device which is perpendicular to the body, characterized in that the watertight walls gas and liquids are in essentially gas-tight surface contact with the filtering and odor removal material, the   20. part of the device gas discharge in the atmosphere environ-   relative to the inlet located between the meatus or other orifice of the body and the filter material so that the   path followed by the gases through this material has a long   at least five times its minimum dimension.   25. Vent device according to any one of claims 1 to 9,   characterized in that it is arranged to be attached to a bag or po-   for the collection of solid and liquid the orifice of the human body.   Vent device according to one of Claims 1 to 9,   30. characterized in that it comprises a flat disk formed of the odor removal material, covered on a surface by a material   gas-tight which is in gas-tight contact with it, and   covered on its other surface by an annular layer of material   gas-tight which is in gas-tight contact with it, the   35. being arranged to be placed on a shutter or tampon of the orifice of the human body which is inserted into this orifice so that the annular-shaped covering layer is directed towards the body of the person, a central opening of the annular layer being aligned with the orifice of the human body so as to ensure the admission of gases through said opening in the filter and odor removal disk, the gases being   unloaded through the edge of the disc of 5. smell odor.   Vent device according to Claims 1 to 9, characterized in that   it comprises a flat disc made of the odor removal material, covered on a surface with a water-resistant material   gas, this material constituting a wall impervious to gases and   10.sides in sealing contact with said flat disk, the flat disk being covered on its other surface by an annular layer of gas-tight material constituting a wall which is in sealing contact with said flat disk, the disk being arranged to be placed on a shutter or tampon the orifice of the human body that   15. is inserted into this hole so that the coating layer   annular shape is directed towards the body of the person   a central opening of the annular layer being aligned with the orifice of the human body so as to ensure the admission of gases through said opening in the filter disk   20. and removing odors, the gases being discharged through the   from the edge of the odor removal material disk, the distance   radially between the edge of the central opening of the annular layer   re and the outer edge of the same annular layer being at least   five times the thickness of the flat disc of o 25. deurs.   Ventilation device according to Claim 11 or 12, characterized in that the gas-tight contact established between the disc of filtering and odor removal material and the covering layers   gas tight is achieved by adhesion.   Ventilation device according to claim 11 or 12, characterized in that   the gas-tight contact established between the material disk and the   filtering and odor removal and coating layers.   gas-tight, is established by magnetic means.   Vent device according to one of Claims 1 to 9,   35. characterized in that it has the form of a flat member formed of the odor removing material, which is in gastight contact on both sides with gastight walls, the inlet of the   gas in the filtering and odor removal material is   The distance between the inlet portion and the discharge portion being at least equal to five times the thickness of the disk, and the discharge of the gases being effected on another edge of the flat element; .   Ventilator according to one of Claims 1 to 9,   characterized in that it is in the form of a flat element formed of the material   This flat element forms a gastight contact with the gas-tight and gas-tight walls.   being formed by the waterproofing material, the   10. the gas in the filtering material and odors removal taking place on one edge and the discharge of gas from the device in the surrounding atmosphere taking place on another edge of the disk, the distance between the part input and the discharge part being   at least five times the thickness of the disc.   15. Vent device according to claim 15 or 16, characterized in that   that the filtering and odor removal material has an opening   the inlet of the gases in the filtering material is   killing on the edge of the central opening, the discharge of gases   on the edge of the outer periphery of the flat member, 20. means being provided to prevent a direct escape of gases through the central opening, the flat surfaces of the flat member.   being in gastight contact with walls or layers of   covering and the radial width of the flat element being equal to at least five times its thickness.   25. Vent device according to claim 17, characterized in that the wall or covering layer located on the side of the element.   ring-shaped dish that is not in contact with the human body   hand extends over the central opening of the ring and ensures its hermetic sealing.   30. Vent device according to any one of claims 15 to   18, characterized in that the gas-tight contact between the   filtering and odor removal and the walls or   Gastight covering is provided by adhesion.   20. Vent device according to claim 19, characterized in that the two gas-tight cover layers are adhesive on both their sides.   Ventilator according to claim 17 or 20, characterized in that one of the cover layers is adhesively secured on one side of the annular disc constituted by the filter material and   of odor removal while the second surface of this   layer is arranged to stick to the skin of the person   turn of the orifice of the human body and that a surface of the   5.condecoat layer is fixed by adhesive on the other side   of the annular disc of the filtering material and removing o-   while the second surface of this second layer of   cover is glued to a pocket used to collect   liquid and solid evacuated from the orifice of the human body.   22. Vent device according to claim 21, characterized in that the second surface of the second covering layer is fixed   by adhesive on a collar provided on the collecting bag.   Vent device according to claim 17 or 21, characterized in that   what the gas reception edge of the central opening of the   15. The water formed by the filtering and odor removal material is   covered by a hydrophobic material and permeable to gases.   24. Vent device according to one of claims 17 and 19, 20,   characterized in that one of the surfaces of a cover layer is adhesively secured to one side of the annular disk formed by   20. the filtering and odor removal material while its se-   conde surface is free and arranged to stick to the surrounding skin.   the orifice of the human body and that a surface of the   the covering layer is adhesively secured to the second side of the annular disc constituted by the filtering and odor removing material while the second surface of the second layer is adhered to the flat interior side of a flange. cover provided on a buffer engaging with play in the central opening of the filter disk, this buffer being.agencé   to be inserted into the orifice of the human body ..   30. Vent device according to claim 17, characterized in that the gas-tight covering portion has on the surface facing the human body a larger central opening than the active filter material disk and that the another gas-tight covering portion, the radial covering distance 35. gas-tight, the radial distance separating the inner edge of the first covering portion from the outer edge of the material   filtering capacity of at least five times the thickness of the filtering. 247648 1 -31-   Vent device according to one of Claims 1 to 9,   characterized in that it has the shape of an annular element of filtra-   ge consisting of a filtering material and odor removal and a gas-tight wall is constituted by a flange 5. provided on a pad arranged to be inserted into the orifice of the human body, the gas-tight wall , provided on the surface directed towards the human body, being constituted by a layer of adhesive or by   a film of gas-tight material.   Ventilation device according to any one of claims 1 to 9   10. or 26, characterized in that it has the shape of an annular element of   filtering consisting of a filtering material and removal of o-   the annular element being in gas-tight surface contact with gas and liquid-tight walls, one of said walls being constituted by a flange provided on a buffer 15 arranged to be inserted into the orifice of the human body, the gastight wall, provided on the surface directed towards the human body, consisting of a layer of adhesive or a film of material   gas-tight, the radial width of the wall on the surface   to the human body being at least five times the thickness 20. that element.   Vent device according to claim 26 or 27, characterized in that   gas-tight contact is established between the filter element and the   trage and collar by magnetic means.   Vent device according to one of claims 19 to   25. 28, characterized in that it comprises at least two types of material   filtering and odor removal sites which are placed   around the central opening.   Vent device according to one of Claims 1 to 9, 11, 12 and   17, characterized in that the gastight contact is established in   30. be the filter material and the walls or layers of overlap by elastic forces.   Vent device according to one of claims 1 to 9   and at 30, characterized in that the odor removing material   is formed at least in part of active carbon.   35. Vent device according to claim 31, characterized in that   the active carbon is distributed in a granular form in a fiber.   33. Vent device according to claim 32, characterized in that   the fibrous material is a cellulosic fibrous material which is   in the form of a textile or non-woven product or a cottony or wadded material.   Ventilator according to claim 31, characterized in that the filtering and odor removal material is in the form of a filter element consisting of an open-cell elastic cell matrix. which is impregnated with a dispersion of active carbon in a binder.   10. Vent device according to claim 34, characterized in that   the binder is a solution of a polymer or a copolymer.   36. Vent device according to claim 34, characterized in that the binder is a dispersion or a latex of ethylene and acetate of   vinyl, a styrene-butadiene latex or an acrylic latex.   15. 37. Vent device according to claim 31, characterized in that   the filtering and odor removal material is a matrix of   elastic, open-cell membrane of a polymer in which the active carbon is distributed in the form of particles inside of the polymer itself.   20. 38. Vent device according to claim 37, characterized in that it further contains the filter material in the pores of the matrix.   39. Vent device according to any one of claims 9 to 31,   characterized in that the filtering and odor removing material   25. is an open-cell, elastic, cellular matrix of a   lymere containing a large amount of amino groups.   40. Device-vent according to claim 39, characterized in that the elastic cell matrix, with open cells, is impregnated with an amine.