FR2523448A1 - CONNECTION FOR CONNECTING CANNULAS, CATHETERS, PIPES AND THE LIKE - Google Patents

Abstract

THE INVENTION DESCRIBES A MALE HALF-CONNECTOR 12 WHICH IS CLOSED IN THE DISCONNECTED STATE BY MEANS OF A DISC 34 FORMING A VALVE AND WHICH OPENS IN THE COUPLED STATE UNDER THE ACTION OF A CENTRAL TUBULAR ELEMENT 16 MOBILE IN AXIAL TRANSLATION. THIS 16 MOBILE TUBULAR ELEMENT IN AXIAL TRANSLATION PRESENTS PREFERABLY ON ITS OUTPUT SIDE A LOWER MALE 38 CONE WHICH CAN COOPERATE WITH A CORRESPONDING 36 INTERNAL CONE BELONGING TO A FEMALE HALF-CONNECTOR 14, THIS CENTRAL TUBULAR ELEMENT 16 MOVING AXIAL '' REAR UNDER THE EFFECT OF THE COUPLING OF THE TWO HALF-COUPLINGS AND THEN OPENING THE VALVE DISC 34. THEN, TWO CONES 36, 38 ARE SPREADED AS WELL AS THE FIXING OF THE TWO HALF-COUPLINGS 12, 14 ONE HAS THE OTHER.

Description

The invention relates to a connector for the

  connection of cannulas, catheters, tubes and equivalents

  slow, comprising a male or half-connecting element

  male cord, which is surrounded by an outer sleeve and a female connector element or female half-connector

  which can be fitted in this sleeve and whose surface

  this connection forms a tight seal with the surface

  ce of connection of the male half-fitting, the watertight seal

  che can be blocked by locking elements

  provided on the inner surface of the sleeve and on the surface

this external of the female half-connector.

  A fitting of the kind mentioned above is de-

  written in the German patent application DE-OS 31 00 622 in which the axial lumen of the female half-connector can be closed by a valve disc acting as a shutter member and which can be opened in the coupled state by the tip of the outer cone of the half-fitting

  male At this point, the tip of this outer cone passes through

  a star slot in the valve disc

  which then closes when the outer cone is raised

  pulled In this way, only the half-fitting which presents

  this valve disc, i.e. the female half-fitting

  the, can be closed, while the male half-connector and

  the tubular pipe which connects to it remains inevitable.

  open when uncoupling Liquid may

  thus escape from the male half-connection In addition, the re-

  open region of the male half-connector and the tubular pipe

  re that connects to it can easily be contaminated with microbes. When such contamination occurs, pinching the hose connected to the fitting cannot remedy the situation because, when

  liquid passes through the fitting, microbes that are

  wind in this connection can reach the patient through the open tubular line and we observe

inflammatory phenomena.

  Such contaminations are particularly

  fear in the case of patients who are subject to di-

  Continuous ambulatory intraperitoneal alysis (CAPD) In this treatment, a dialysis solution is passed through the patient's peritoneum using a tubular line. To renew the dialysis solution,

  interrupt this tubular pipe, which is done

  kills using the fitting mentioned at the beginning When

  verture of such a connection, it then poses problems

  contamination which lead to peritonitis of the pa-

  holds The fitting quoted at the beginning certainly lowered the

  peritonitis rate initially very high in this treatment

  CAPD but he could not completely eliminate it from

  so that inflammations of the peritoneum are still observed

  ne which are due to the penetration of microbes through a decoupled half-connector Another connection is known by the patent application of the FRG DE-OS 28 17 102 The connector described in this document also comprises a female half-connector whose passing light tapers into a cone from

  on the entry side This passage light is here also

  closed off, as in the connection according to patent application DE-OS 31 00 622 cited above, by a valve disc arranged transversely which can be opened by the

tip of the male half-fitting.

  Since this half coupling can be connected

  strung to different other half-fittings, in which the length of the conical part can vary,

  in a particular embodiment an element tu-

  central bible movable in axial translation, which has the function of ensuring the opening of the valve disc Cet

  mobile central tubular element therefore serves as an extension

  of the tip of the male half-connector and can therefore

  open the valve disc even in the case of half-rac-

  3 S male cords of which the usual length is not enough-

to ensure opening.

  we therefore know, from patent applications DE-OS 28 17 102 and 31 00 622 mentioned above, female half-fittings which are closed by a valve disc in the uncoupled state and which, in the coupled state, open under the action of the tip of the male half-connector Furthermore, these documents indicate that the male half-connectors are

generally open.

  There is in the RFA patent application DE-OS 28 18 326 a device very similar to that of the patent application DE-OS 28 17 102 Here also, in a female half-connector, is placed a disc of

  valve which can be opened by the tip of a half-rac-

  male cord or by a metal needle in this way

  Lesson, the explanations given in relation to the aforementioned patent application DE-OS 28 17 102 are also valid

for this case.

  The invention therefore aims to ensure that

  that the passage light of the male half-connector is self-

  matically closed in the uncoupled state and open to the

mated tat.

  The solution to the problem is provided by the fact that the central male tubular part is movable in axial translation in the sleeve and that it is provided, behind the end of the male tubular part which is opposite to the inlet opening of the fitting, a shutter member which closes the passage channel and

  which must be opened by the end of the tubular part

male area in the coupled state.

  The connector according to the invention has all of a

  edge the advantage that in the deactivated state

  coupled, the male half-connector is closed in the region of

  passage channel through a shutter member which is pre-

  ference formed by a valve disc This valve disc is arranged behind the inner connection element

  which is arranged movable in axial translation inside

  laughter of the retaining element In this way, this organ-

  obturator closes the passage channel in a place where Zi

  you can't touch it with your fingers.

  In the coupled state, the male half-connector is

  pressed into the female half-connector, the side surfaces

  Rales of the inner cone and the outer cone of the half-fittings then cooperating by a force connection and

  thus establishing a tight connection to liquids.

  Here, the interior elements of the fitting are dimension-

  born in such a way that the tip of the male half fitting

  opens the valve disc which is placed behind the side

  inside the female half-connector

  screwing the female half-fitting into the male half-fitting

  the, the axially movable and sliding internal connection element is pushed backwards and in this way opens the shutter member which is disposed behind

  this axially movable element, considered in the al-

  lant to the pipe Communication is established by the

  passage of the liquid through the fitting, the two orga-

  the shutters being then open.

  To decouple the fitting, remove all

  first the axially movable element of the obturating member

  because the bond by force between the inner cone

  laughing and the outer cone still continues to act and res-

  Then you keep the deletion of this-

  bonding you by force, i.e. the extraction of the cone

  male of the female half-connector, the second plug

  teur being closed As a result, that is to say in the state

  not coupled, the two channels located in the half-rac-

  cord, which are made in the form of axial holes

are closed.

  This bilateral closure of the channels effectively guarantees the exclusion of microbes entering

  the piping passing through the elements of the fitting.

  In addition, possibly contaminated regions

  are limited to a given region of the surface of the rac-

  cord which can be easily disinfected with a disinfectant solution In addition, the obturation of the

  piping by the shutter members prevents the de-

  disinfectant does not enter the piping and, from there, does

  tinctures the patient's body The bilateral closure of the piping therefore represents, among other things, a more

  very easy to disinfect without having to worry

  dre that disinfectants, which are toxic to high do-

  is, do not pass through this obturation Besides, the obturation naturally guarantees that no substitute liquid or

  blood in the event of accidental uncoupling of the two half

  fittings so that this effectively improves safety

  rity of such an infusion device.

  According to other characteristics of the invention

  tion, the central tubular element is essentially composed of a male connection cone and a cylindrical region, which has at its end which is

  opposite the opening of the fitting a flange an-

  ring arranged to slide in an intermediate space

  re; a cone ending in a point connects to said

  annular flange towards the rear; the tubular region

  central re of the central tubular element is in re-

  line a certain distance from the tip of the front part of the sleeve; in the region of the front and central parts of the sleeve is arranged a collar which extends radially inwards and has a

  axial light; the diameter of this corresponds

  around the diameter of the cylindrical region of the element

  central tubular; the back side of this glue

  rette forms a stop for the annular flange of

  the central tubular element; with the collar of the

  central tie of the sleeve connects to the rear a

  cylindrical part whose inner wall is immediate-

  ment adjacent to the peripheral surface of said adhesive-

  annular rette; there is provided as a shutter member a valve disc placed between the central parts and

  back of the sleeve; the diameter of the valve disc cor-

  corresponds to the inside diameter of the rear part of the

  sleeve and this disc rests on a shoulder of the sleeve

  chon; in the rear part of the sleeve is fitted a fitted piece which has a recess in the region of the axial lumen, on the side directed towards the valve disc; this part has on its front face an annular peripheral region which presses the valve disc against said shoulder and at the same time serves as a stop for said flange; an axial flow channel is provided along said cylindrical part

  of the central part of the sleeve of the collar of the man-

  chon, of the cylindrical region of the tubular element

  central and / or said annular collar.

  Other features and advantages of the

  vention will be better understood on reading the description

  tion which will follow from an exemplary embodiment and with reference to the accompanying drawings in which,

  Figure 1 is a longitudinal section of the half

  male connector which is coupled to a female half-connector; Figure 2 is a corresponding partial view

  in Figure 1 and showing the male half-connector to the

unmated state;

  Figure 3 is a view corresponding to the figure

  re 2, in the coupled state, in these figures, we have omitted

  represent one of the half fittings for the clarity of the

  sin; Figure 4 is an enlarged section of a male disc valve disc;

  Figure 5 is an enlarged section of the half-rac-

male cord, along line V-V; and

  Figure 6 is an enlarged section of the half-rac-

  male cord, taken along line VI-VI.

  In Figure 1, there is shown a connector which

  consists of a male half-connector 12 and a half-connector

  female cord 14 The male half-connector comprises an element

  central tubular ment 16 which has an axial lumen 18 This axial lumen extends over the entire length of the male half-connector 12 and ends in a tubing onto which it is possible to fit and fix a tube, a catheter or the like. Similarly, the -demi-female connector 14 also has an axial lumen 22 which also extends rearward and ends with a second tube 24 on which it is also possible to fit a pipe or

equivalent.

  This female half-connector 14 has a part

  main tubular 26, the front region 28 of which is

  stepped A front end piece 30 adjusts with a

  complementary to me in this tier; a valve disc 34 being placed in the region of the lower step 32 of the

  main tubular part 26 and transverse covering-

  the axial lumen 22 This valve disc 34 is te-

  naked and locked in position on the shelf 32 by the end piece 30. The internal surface of the end piece 30 forms the internal cone 36 of the female half-connector 14, which adjusts

  complementary on the outer cone 38 of the half

  male connector 12 and establishes a firm connection by force.

  This inner cone 36 is only provided in the ar region

  of the end piece 30 while, in the front region of this end piece, a recess 40 is formed which cannot

  come into contact with the central tubular element 16.

  By the way, the outer surface of this region before

  end piece 30 has a fixing device, pre-

  refer to a thread or equivalent, which forms natural-

  also intermediate spaces 44.

  Furthermore, in a preferred form of realization

  sation, the main tubular part 26 has in its outer surface an annular peripheral groove 46 in which is engaged an O-ring 48 Towards

  the rear, there is still a collar 50 which surrounds

  re ring the external surface of the tubular part 26 According to an advantageous form, it is connected to this flange a striated grip part 52 which facilitates the

handling the connector 10.

  In the closed state, the valve disc 34, which is crossed by the front tubular region 54 of the central tubular element 16 has the shape shown in FIG. 4 and has a star notch 56 placed

  in central position This star notch 56 opens

  vre when it is touched by the front tubular region 54, the different segments 58 pressing against the outer periphery of the front tubular region 54

  and thereby exercising a sealing function.

  Another sealing function is provided by

  the bond by force between the outer cone 38 and the c 6-

do interior 36.

  Regarding the embodiment of

  this female half-connection, we can refer to the

  description of the patent application DE-OS 31 00 622 above

tee.

  As previously explained, the de-

  male mid-connector 12 comprises a central tubular element 16 which has on its external surface an external cone 38 which extends substantially backwards from the tubular region before 54 This external cone 38, as well as the complementary internal cone 36 are produced

  for example, in the form of Luer cones The ex cone

  tieur 38 can also be replaced by a part

  cylindrical, provided that the corresponding element complements

  shut up has a corresponding configuration, and either

  produced for example in the form of a cup-shaped valve

  the. Behind this outer cone, connects

  then a substantially cylindrical region 60 which pre-

  feels in its rear region an annular collar 62

  on which a cone 64 protrudes rearwards

  tending to point which forms the termination of 1 the central tubular element 16 This central tubular element is entirely housed inside the outer sleeve 66

  with possibility of axial translation.

  This outer sleeve 66 is essentially composed of a front part 68, a central part 70 and

a rear part 72.

  The inside diameter of the front part corresponds to

  lays substantially on the diameter of the main tubular part 26 of the female half-connector 14 so that

  this -part before the sleeve can be fitted by-

  above this main tubular part 26 and, in particular

  tie, over the O-ring 48 provided in this part, this O-ring being compressed and resting

  against the internal surface of the front part 68 of the man-

  chon We get this way here too a connection

  completely waterproof, i.e. a screen stopping bacteria

  laughs. The distance a separating the tip 74 from this front part 68 of the sleeve from the front tubular region

  54 of the central tubular element 16 is calculated from such

  the way that, when the two half-fittings 12 and 14 are fitted or placed at an angle, this tubular region 54

  can only touch the inner cone 36 located in re-

  trait In addition, the distance a is calculated in a way

  re to exclude the risk of accidental contact between this

  tubular region 54 and the fingertips this way

  lesson-, this dimensioning excludes any contact with

  possibly contaminated gions.

  This front part 68 of the sleeve presents in or

  advantageously be on its internal wall a device

  76 for fixing the female half-connector 14, arranged

  tif which can cooperate with the complementary device 42 This device 76 is preferably produced in the form of a thread. The central part 70 of the sleeve

  connects to this front part 68 of the sleeve towards the rear

  re, by forming a collar 78 which extends radially

  inwards This flange 78 has a light

  re axial 80 whose diameter corresponds substantially to

  diameter of the cylindrical region 60 of the tubular element

  laire central 16 The tubular wall of this light

  axial 80 serves as an axial guide for this cylindrical region

drique 60.

  The collar 78 is stepped on its step

  rear face 82 which serves as a stop for the collar an-

  ring 62 and it ends in a cylindrical part 84, the peripheral surface of the annular flange 62 being disposed in the immediate vicinity of the internal surface 86 of this part 84, which forms a guide

  additional for the central tubular element 16.

  In turn, the cylindrical part 84 is again

  calf stepped by forming a shoulder 88 which extends ra-

  dialing outwards and following which

  cord the rear part 72 of the sleeve The diameter in-

  tieur of this rear part corresponds to the diameter of the valve disc 90 which is arranged transversely to the direction of flow and which covers the entire flow channel Here, the peripheral edge 92 of the valve disc 90 rests on the shoulder 88 and is pressed against this shoulder 88 by means of a piece

adjusted 94.

  This fitted part is of a sensitive configuration.

  clearly cylindrical, its outside diameter corresponds

  dant to the inside diameter of the rear part 72 of the sleeve and being able to be fitted in this part of the

  sleeve To establish communication for the drain-

* ment, it naturally presents an axial light 96.

  Furthermore, the tube 20 to which can be connected

  strung a pipe or equivalent protrudes in the center on this piece The axial light 96 widens towards the valve disc 90 to form a recess 98, this

  recess 98 preferably flaring with a conical shape

  that or even having a hemispherical shape A the

  tip of this adjusted piece 94, that is to say near

  valve valve 90, the internal diameter

  laughter of this recess 98 preferably corresponds roughly to the diameter of the axial lumen 80 This region

  front of the adjusted part fixes the valve disc 90

  tre the shoulder 88, while the fitted piece 94 it

  even is rigidly fixed to the rear part 72 of the man-

  chon, for example by solvent welding.

  As can be seen in FIGS. 2 and 3, in the uncoupled state, the tubular flange 62 is supported on the rear face of the flange 78 while, in the coupled state, it is supported on the front region 100 of the fitted piece 94 The distance between the rear face 82 and the surface of the valve disc 90 which is directed towards the central tubular element 16 is preferably calculated so that the central tubular element 16 does not exert pressure, neither on the rear face 82, nor on the surface of the valve disc 90 Both

  half-fittings 12 and 14 are connected as follows:

  te: first of all, we plug the male half-fitting on

  the female half-connector until the tubular region

  re front 54 of the central tubular element 16 touches the

  valve disc surface 34 Owing to its properties

  elastomeric tees, this valve disc first of all exerts pressure on the tubular element 16 and pushes this element axially backwards In the pursuit of fitting or screwing the half-fittings 12 and 14,

  the two valve discs 34 and 90 are first of all

  green respectively by the part 54 and by the cone 64

  by the fact that the star notch 56, provided in accordance with

  Figure 4, which is provided in the two dis-

  the valve opens and the segments 58 move apart

  each other and, to this extent, exercise

  hundred naturally elastic pressure on the two

  end regions of the central tubular element 16 En-

  following or at the same time, following the fitting

  half-fittings 12 and 14 one inside the other, it spreads

  blit a bond by force between the inner cone 36 and

  the outer cone 38 and, at the same time, the arrival at the bu-

  tee of the annular flange against the end region 100 or the corresponding region of the valve disc 90 which surmounts it In FIG. 3, one can also see for what purpose the recess 98 is provided When the valve 90 is open, this obviously receives the segments

  folded down from the valve without any con-

  tact between these segments and the surface of the recess.

  The fixing of the half-fittings 12 and 14 is carried out

  kills through fasteners 42

  and 76 which are advantageously constituted by threada-

  ges, so that the two half-fittings 12 and 14 are screwed

  feels one inside the other The flange 50 then acts as a limit stop for the tip 74 of the front region 68 of the sleeve, the total opening of the two

  valve discs, as well as the establishment of a link

  sound between the inner cone and the outer cone

being guaranteed in this state.

  If the two half couplings have to be turned relative to each other due to this

  thread connection, the central tubular element is na-

  also rotated around its

  longitudinal axis so that the tubular member cen-

  tral 16 and the interior region of the male half-coupling 12 are advantageously shaped accordingly In this case, all the regions concerned from the interior of the

  male half-connector 12 are circular in shape.

  To decouple the half-fittings 12 and 14, one of the half-fittings is extracted from the other. As a result of the force connection between the internal cone 36 and the

  outer cone 38, this movement first of all attracts the

  central tubular element 16 axially forwards and optionally rotates it radially, the cone 64 then withdrawing from the valve disc 90 which, as a result,

  returns to its original closed state Likewise, the

  rette 62 rests on the rear face 82 of the collar-

  te 78, so that the force connection between the inner cone and the outer cone is eliminated and that then, the tubular region 54 emerges from the second valve disc Finally, the two half fittings are separated

  12 and 14, however, that in each of these two half

  fittings, the corresponding flow channels are closed by the valve discs In this way, no liquid flow can occur from the elements

  connection, no contamination from outside

  laughing through the valve discs.

  It should be added that the valve disc may be made of an elastomeric material, for example

  a material of the type of rubber or silicone Natu-

  In reality, this shutter member, which is preferably made in the form of a valve disc, must not

  necessarily present the configuration of a disc.

  Naturally, it can also present the configuration

  tion of a cup In this way, we can, for example-

  ple, extend from the inner cone 38 since the outer cone 36 can plunge into this cup valve and can not only cross the front region of this valve but also be applied by force action, by its outer cone, against the inner surfaces

of the bucket valve.

  Furthermore, of course, the slot 56 which

  is preferably star-shaped, can also be replaced

  created by a slot having another configuration.

  However, as a whole, the elastic material of which

  the shutter members are composed must be sufficient

  elastic to close the flow channel with

  curity and so that it is necessary to exercise a certain

force to open the slots.

  To avoid contamination as much as possible at the time of connection, the

  two half-fittings 12 and 14 by spraying a disinfectant

  liquid fectant This disinfectant, which is harmless

  for the patient in small quantities, is in all

  tes the interior regions of the connector 10 when the latter is coupled This is how, for example, a disinfection chamber is formed between the O-ring 48 and the connection region established between the cone

  inside 36 and outside cone 38 by forming action

  ce This disinfection chamber, which is wet with

  disinfectant, is therefore formed by the assembly, for example-

  bayonet or screwed, established between the fastening devices 42, and by the recess 40, as well as by the

  channel which connects these two intermediate spaces.

  To prevent possible contamination from occurring in the intermediate space 102 formed between the valve disc 90 and the flange 78, it is

  it is desirable that the disinfectant introduced also reaches this intermediate space For this purpose, it is advantageously

  provided between the central tubular element

  16 and the central part 70 of the sleeve of the drainage channels

  also 104 through which the disinfectant can reach

in the insert 102.

  In Figure 2, there is shown an embodiment of flow channels 104, which are provided

  in the central part of the sleeve These channels extend

  tooth axially in the interior wall 108, as well as in the rear face 82 and along the axial lumen

  Otherwise, these flow channels 106 could na-

  turally be provided, as seen in Figure 6, in the central tubular member 16, namely, the

  along the cylindrical region 60 as well as glue-

  annular rette 62 Other embodiments are

  shown in the same way in Figures 2 and 3 as well

if in Figures 5 and 6.

  This embodiment guarantees that it

  forms a second disinfection chamber in the volu-

  insert 102 on the valve disc 90 so that any contamination present in this area is removed with certainty This therefore provides a further improvement in the sterility properties of this connector. Fittings of this kind are made of the usual materials, for example polycarbonate, PTFE

  and equivalent and can advantageously be transparent

  In particular, these fittings are very durable and can withstand a large number of handling operations.

  connection without being damaged or destroyed.

  Of course, various modifications may be made by those skilled in the art to the device which

  has just been described only by way of non-binding example

  mitative without departing from the scope of the invention.

Claims (15)

R E V E N D I C A T I O N S   1 connector for connecting cannulas, catheters, tubes, and the like, comprising a male connector element or male half connector, which is surrounded by an outer sleeve and a female connector element or female half connector, which can be fitted into this sleeve and the connection surface of which forms a   tight seal with the connection surface of the half   male connector, the waterproof seal can be blocked by   locking elements provided on the inter-   ne of the sleeve and on the external surface of the female half-connector, characterized in that the central male tubular element (16) is movable in axial translation in the sleeve (66) and in that it is provided, behind the end of the male tubular element (16) which is opposite the inlet opening of the connector, a shutter member which closes the passage channel, member which   is intended to open under the action of the tubular element   male area <16) in the coupled state.   2 fitting according to claim 1, character-   se in that the central tubular element (16) is essen-   partly composed of a male connection cone (38) and a cylindrical region (60).   3 fitting according to claim 2, character-   se in that the cylindrical region (60) has at its end which is opposite the opening of the fitting an annular flange (62) which is mounted movable in   translation in the intermediate space (102).   4 fitting according to claim 3, character-   se in that a supper (64) which ends in a point becomes   rope back to the annular collar (62).   Fitting according to claim 1, characterized in that the front tubular region (54) of the central tubular element (16) is set back a certain distance (a) from the point (74) of the part front (68) of the sleeve.   6 fitting according to claim 1, character-   in that in the region of the front part and the   central part (68, 70) of the sleeve, a collar is provided   rim (78) which extends radially inwards and which has an axial lumen (80)   7 fitting according to claim 6, characteristic   in that the diameter of the axial lumen (80) cor-   roughly corresponds to the diameter of the cylindrical region   that (60) of the central tubular element (16).   8 fitting according to claim 6, character-   in that the rear face (82) of the collar (78)   constitutes a stop for the annular flange (62).   9 fitting according to claim 6, character-   se in that at the flange (78) of the central part (70) of the sleeve is connected a rear part   cylindrical (84) whose internal surface (68) is direct   adjacent to the peripheral surface of the adhesive annular rette (60).   10 fitting according to claim 1, character-   risé in that there is provided as a shutter member a valve disc (90) mounted between the central part   (70) of the sleeve and the rear part (72) of this sleeve.   11 fitting according to claim 10, charac-   terized in that the diameter of the valve disc (90) corresponds to the inside diameter of the rear part (72) of the sleeve and that the valve disc (90) takes support on the shoulder (88).   12 fitting according to claim 10, charac-   terized in that, in the rear part (72) of the sleeve   is engaged an adjusted piece (94) which has a recess   ment (98) in the region of the axial lumen (96), on   the side facing the valve disc (90).   13 Fitting according to claim 12, charac-   terized in that the recess (98) has a conical or hemispherical shape and receives the cane (64) as well as the segments (58) of the valve disc (90) when   these are in the open state.   14 Connection according to claim 6, charac-   terized in that the distance between the rear face (82) of the flange (78) and the surface of the valve disc (90) facing the central tubular element (16) is dimensioned so that the central tubular element ( 16) exerts pressure neither on the rear face (82)   nor on the surface of the valve disc (90).   15 fitting according to claim 12, charac-   terized in that the fitted part (94) has on its front face a peripheral annular region <100) which presses the valve disc <90) against the shoulder (88)   and at the same time serves as a stop for the collar (62).   16 Fitting according to claim 1, character-   risé in that at least one flow channel (104, 106) which extends axially is provided along the cylindrical part (84) of the flange <78) of the region   cylindrical (60) and / or the annular flange (62).