FR2575083A1 - DOUBLE CHAMBER IMPROVED MIXING SYRINGE - Google Patents

Abstract

DOUBLE CHAMBER 2, 3 MIXING SYRINGE INCLUDING: -TWO CHAMBERS 2, 3 ARRANGED FACING EACH OTHER, EACH CONTAINING A LIQUID INTENDED TO BE MIXED; -A MEMBRANE 6 TO MAINTAIN THE TIGHTNESS BETWEEN THE TWO TEMPORARILY LIQUIDS2, 3; -AN AGITATOR 7 SUITABLE TO SLIDE IN THE FIRST CHAMBER2 IN A LONGITUDINAL BACK-AND-BACK MOVEMENT AND TO ENSURE THE STIRRING OF THE TWO LIQUIDS2, 3 ONCE MIXED; -A PISTON 4 COAXIAL TO THE AGITATOR7 TO EJECT THE LIQUIDS MIXED OUT OF THE SYRINGE THROUGH AN OUTLET 5; CHARACTERIZED: -IN THAT THE TWO CHAMBERS 2, 3, ARRANGED FACING ONE OF THE OTHER, ARE SEPARATED BY A PERFORABLE WATERPROOFING6 MEMBRANE6; -AND IN THAT THE END 18 OF THE AGITATOR7, 10 ARRANGED IN THE FIRST CHAMBER2 IN THE FORM OF A TIP18 INTENDED TO PERFORATE THE SAID MEMBRANE6 WHEN ONE DESIRES TO MIX THE TWO LIQUIDS.

Description

-_ 1 -

  IMPROVED DOUBLE CHAMBER MIXING SYRINGE.

  The invention relates to a new type of syringe

double chamber mix.

  Double chamber mixing syringes are con-

  naked for a long time. In patent FR-A-2,160

  668, it has for example been proposed to arrange the two chambers

  mixers, each closed by a membrane,

  gard, then to place in the interval formed between the

  two chambers a screwable assembly containing a needle

  the injection, intended when the time comes by

  of the two chambers, to perforate the two mem-

  branes and thus allow the passage of liquid from one room to the other. This type of syringe was hardly

  developed because it remains complex to carry out, therefore cost-

  teuse, not very suitable for viscous products and finally

times difficult to handle. -

  In the patent application PCT-WO-84/00011 of one

  depositors, we offered a double-comparison syringe

  with a sliding piston and an agitator

  coaxial with said piston, able to move in the first

  re chamber in a longitudinal back and forth movement

  so as to ensure the mixing of the mixture produced.

  This solution has many practical advantages. However, the industrial realization of this provision calls for a gasket to

  single effect (lip seal) which, with certain

  duits creates sealing problems, in particular

in time.

  The invention overcomes these drawbacks. She's aiming for a double-chamber mixing syringe that's easy to

  build, economical, and does not present problems

  leak proof, and finally be easy to fill

and to handle.

  The double-compartment mixing syringe according to the invention which comprises: -2

  - two rooms arranged opposite containing each

  cune a liquid intended to be mixed,

  - a membrane to temporarily maintain the

  sealing between the two liquids, - an agitator, capable of sliding in the first chamber in a longitudinal reciprocating movement and

  to ensure the mixing of the two liquids once they are mixed

  - a piston coaxial with said agitator, intended to eject the mixed liquids out of the syringe through an outlet nozzle, is characterized: - in that the two chambers arranged opposite

  from each other are separated by a waterproofing membrane

puncture-proofness; -

  - and in that the end of the agitator arranged

  in the first chamber has the shape of a point desti-

  born to perforate said membrane when it is desired to

  read the mixture of the two liquids.

  Advantageously, in practice: - the two facing mixing chambers form a single body separated into two elementary compartments

  by said membrane also coming from molding, the

  mity of the second chamber which forms an end piece receiving a closure cap; - This closing cap of the second chamber is screwed onto the outlet nozzle;

  - this screwed cap penetrates a determined length

  born in the second bedroom in order to reduce the volume

  me; - this second chamber, aligned with the first, is cylindrical, and the perforation point fixed to the end of the agitator which slides in the first

  chamber is attached to the end of a cylindrical portion

  that the diameter is less than the internal diameter -3- of the second chamber, so as to best ensure the passage of the liquid from the second chamber into the first chamber, the overall length of this portion and of the tip being less than the length of the second chamber; the agitator comprises a disc-shaped head fixed to the end of the longitudinal axis coaxial with

  the axis of the piston, this disc has, on the one hand,

  fices crossing regularly arranged and on the other hand, the point intended to perforate the separation membrane; - the bottom of the first chamber arranged opposite the head of the disc-shaped agitator comprises

support stops for this disc.

  The manner in which the invention can be realized and the advantages which result therefrom will become more apparent from the

  examples of the following embodiments given for information only

  cative and not limiting in support of the appended figures.

  Figure 1 shows in longitudinal section a pre-

  best embodiment of the invention.

  Figure 2 is a section of the piston assembly /

  agitator of Figure 1 along axis 1-1.

  Figures 3 and 4 show two embodiments

  tion of the outlet nozzle and the second chamber.

  Figure 5 is an enlarged view of the end of

  the tip-shaped agitator in a form of reali-

preferred location.

  Figures 6 and 7 always show in section along

  gitudinal two other embodiments of the in-

  vention. Referring to the figures, the double compartment syringe essentially consists of a body (1)

  monobloc molded in plastic material, in particular in poly-

  propylene. This body (1) formed of two cylindrical portions

  ques defines two chambers respectively: - a first chamber (2) intended to receive a - 4 - first liquid such as silicone, - a second chamber (3) aligned and arranged opposite the first chamber (2), intended to receive a second liquid, such as a catalyst, intended to be mixed with the first. These two coaxial cylindrical chambers (2,3) are

  separated by a waterproofing membrane (6) also

  nude molding. In the first chamber (2), slide a piston (4) which has at its end a seal (5)

  conventional seal, for example natural rubber

  rel. This piston (4,5) has the function, when the time comes,

  to expel the mixture through the outlet nozzle (25).

  An agitator (7) coaxial with the piston (4) also moves longitudinally in the first chamber (2). This agitator advantageously in the same material

  that the piston, for example of molded polypropylene,

  carries a head (8) and at the end (9) disposed in the chamber (2) a disc (10) having orifices (11) intended to ensure mixing of the mixture. The bottom of the chamber (2) opposite the disc (10) has stops

  (12,13) also coming from molding intended to facilitate

  ter the flow of the liquid contained in the second

  chamber (3) during the casting operation.

  According to the characteristic of the invention, the face of the head (10) of the agitator (7) has a point (18) disposed opposite the membrane (6), intended to come

  perforate this membrane (6) when the time comes to ensure

  mix the liquids contained in the two chambers

  bres (2) and (3) .. In another variant, this agitation-

  tor (7) comprises a safety ring (19) placed at the ex-

  end of the piston (4) which, under the effect of a simple pressure, is surpassed and thus allows the tip (18)

  to perforate the waterproofing membrane (6).

  The end (14) of the chamber (3) -solidated with the body (1) comprises a screw thread intended to receive a cap (15). Depending on the shape of the re-entrant part (26) of this cap in the chamber (3), the volume of this chamber can be varied for the same assembly.

  (3) namely: 3 ', 3 "(see figures 3 and 4).

  the cap (15,15 ', 15 ") is molded in the same

  plastic material than the entire syringe.

  In the preferred embodiment shown in

  Figure 5, the inner end of the head (10) and a-

  agitator (7), (9) has a point (18) constituted by a cylindrical body (28) at the end of which the actual perforation point (18) is arranged,

  the length L3 of the assembly being slightly less

  re to the length of the chamber (3) and the diameter L2 of

  this cylindrical portion (28) being slightly inferior

  laughing at the internal diameter L1 of the chamber (3). Of the

  so, when the tip (18) has perforated the membrane

  drilled (6), the penetration of the cylindrical portion (28) into the chamber (3) ensures better ejection of the liquid contained in this chamber (3) towards the

  chamber (2), thanks in particular also to cooperation

tion with the stops (12,13).

  In the embodiment shown, the body (1) has at its end ears (16) and is

  closed by a screw cap (17).

  The filling of this syringe is carried out from the

  next way. We fill the chamber (2) whose ex-

  end is closed by the membrane (6) by means of the pre-

  mier liquid (1), such as for example silicone.

  The piston (4) / agitator (7) assembly is brought into this chamber, and the screw is closed.

cap (17).

  The second chamber is filled in a known manner

  (3) by the appropriate liquid such as the catalyst.

  The cap (15) is screwed at the end (14) forming an outlet nozzle (25) according to the volume that is desired.

  insert into this chamber (3) (see Figures 3 and 4).

  The syringe is thus ready for use.

  When the user wishes to mix the two lines

  which, it slightly unscrews the plug (5), for example by a quarter of a turn so as to subsequently allow the passage of air. Then, he pushes the agitator (7) so as to pass the rod (19), so that the point (18) comes to perforate the membrane (6). When the tip (18) (see in particular Figure 5) enters the chamber (3), it drives the liquid contained in this chamber (3) towards the chamber (2). At this time, the agitator (7) is printed with a longitudinal movement back and forth and the mixture is stirred by the movement of the head (10) and the holes (11). When it is considered that the mixture is homogeneous, the plug (15) is completely unscrewed and by action on the piston (4), the mixture produced by the end (25) of the chamber (3) is removed.

outlet nozzle.

  If more generally, all of the parts are made of polypropylene, other materials can be used

  insofar as these resist liquids intended

  born to be mixed and meet the requirements of the pharmacopoeia. In the embodiment shown in Figure 6,

  the second chamber (3) is screwed by its end

  moth (21) on a thread (20) provided for this purpose at

  the end of the body (1) at the level of the membrane (6).

  Clamping fins (22) make it possible to tighten this

  chamber (3) when the time comes to the end of the syringe.

  This embodiment is of interest when

  that it is necessary that all the liquid contained in the

  second chamber (3) is eliminated to avoid any

  subsequent problem, including aggression.

  In the embodiment shown in Figure 7, 7- the outer end of the chamber (3) comprises a pusher (23) intended to force after perforation of the

  membrane (6) the passage of the liquid contained in the two

  xth bedroom (3) in the first bedroom- (2).

  The syringes according to the invention have many

  many advantages over commercial solutions

  to date. We can cite: - a reduced number of parts, namely six in the simplest embodiment (body, piston, two

  caps, agitator, attached rod), which reduces con-

  drastically the cost; - the ease of the filling operation which can be carried out separately; - ease of handling;

  - the absence of sealing problem.

  In this way, this type of syringe can be used

  successfully dried for mixing any two-component product requiring homogenization, especially in a sterile environment. We can cite the use in environment

  medical, dental, surgical, even chi-

  crumb such as the resin or glue mixture.

-8-

Claims (5)

  1 / Double chamber mixing syringe. (2,3)   taking: - two chambers (2,3) arranged opposite one another, each containing a liquid intended to be mixed; - a membrane (6) to temporarily maintain the seal between the two liquids (2,3);   - an agitator (7) capable of sliding in the pre-   first chamber (2) in a long back and forth movement   gitudinal and to ensure the mixing of the two liquids (2,3) once mixed;   - a piston (4) coaxial with the agitator (7) for   throw the mixed liquids out of the syringe through   towards an outlet nozzle (5), characterized: - in that the two chambers (2,3), arranged facing one another, are separated by a perforable sealing membrane (6); - And in that the end (18) of the agitator (7,) disposed in the first chamber (2) has the shape of a point (18) intended to perforate said membrane (6) when it is desired mix the two liquids. 2 / syringe according to claim 1, characterized in that the two facing chambers (2,3) form a   single body (1) separated into two basic compartments   res (2,3) by said membrane (6) also coming from   molding, the end of the second chamber (3) which forms   me outlet nozzle (25) receiving a closure cap (15). 3 / syringe according to claim 2, characterized in that the cap (15) for closing the second   chamber (3) is screwed onto the end piece (14).   -9- 4 / Syringe according to claim 3, characterized in that the screw cap (15) penetrates a determined length in the second chamber (3) to reduce volume.   5 / syringe according to one of claims 1 to 4,   characterized in that the second chamber (3) aligned with the first (2) is cylindrical and, the tip (18)   perforation, fixed to the end (10) of the agitator-   (7) which slides in the first chamber (2) has   a cylindrical portion (28) whose diameter L2 is unimportant   smaller than the internal diameter L1 of the second chamber (3), so as to best ensure the passage of the liquid from the second chamber (3) -in the first (2), the overall length L3 of this portion (28) and the tip (18) being less than the length of the second bedroom (3).   6 / syringe according to one of claims 1 to 5,   characterized in that the agitator (7) comprises a disc-shaped head (10) fixed to the end (9) of the axis   longitudinal (7) coaxial with the axis of the piston (4), this   that (10) having on the one hand orifices (11) tra -   pouring regularly arranged and on the other hand, the poin-   te (18) intended to perforate the membrane (6) for separation tion.   7 / syringe according to one of claims 1 to 6,   characterized in that the bottom of the first chamber (2) disposed opposite the head (10) of the agitator (7) in the form of a disc has abutments (12,13) for support for this disc.   8 / Characteristic double-chamber mixing syringe sée in that it includes: -   - a one-piece cylindrical body (1) defining and delimiting two elementary chambers (2,3) each receiving a liquid intended to be mixed with the other   liquid, said chambers (2,3) being aligned and separated - 10 - -   adorned by a perforable sealing membrane (6), and coming from molding; - a piston (4) able to slide longitudinally in the first chamber (2), intended to eject the two liquids once mixed out of the syringe by the end (25) formed by the end of the other chamber (3)   - an agitator (7) also capable of sliding along-   longitudinally in this same first chamber (2) and in the same chamber as the piston (4), comprising: 10. a longitudinal axis (7) coaxial with the axis of the piston (4), a disc-shaped head (10 ) perforated (11) fixed to the end (9) of this axis (7), a point (18) fixed on the disc (10) on the side opposite the axis (7), whose shape (28,   18) and the dimensions are substantially inc   lower than those of the second chamber (3), a cap (15) screwed to the end (14) of the second chamber (3) in the form of a nozzle   (25) and which penetrates over a deter-   mined in this second room (3).   DEPOSITORS: 1 / Mrs. BOSSON Claude 2 / Mr. DESSAPT Bernard MANDATAIRE: Cabinet Michel LAURENT