FR2942213A1 - Pressurized gas i.e. liquid nitrogen, dosing and distribution device i.e. diffuser, for pressurized gas bottle, has cap fixed in cup-shaped element such that cap seals outlet openings when cover is pressed into cup - Google Patents

Abstract

The device has a dosing chamber (C) provided with inlet openings and outlet openings. The chamber is constituted of a cup-shaped piece whose bottom is formed with the inlet openings, and a cover that slides in a cup, where the outlet openings are provided in the cover. A cap, having dimensions complementary to than that of the outlet openings, is fixed in a cup-shaped element such that the cap seals the outlet openings when the cover is pressed into the cup while the outlet opening is free when the cover is released from a pressed position.

Description

DESCRIPTION

The invention relates to a metering and dispensing device for a bottle provided with an outlet valve equipped with a stem and containing a gas under pressure, which device is composed of a metering chamber provided with an opening of inlet into which opens a tip for cooperating with the stem of the pressurized bottle to allow the gas to enter the metering chamber, and an outlet opening allowing the gas contained in the metering chamber to exit said metering chamber.

For the treatment of warts, it is common practice to use the so-called cryotherapy technique. It consists of applying a gas, usually liquid nitrogen, to a wart.

There are several solutions on the market. The first is to spray liquid nitrogen on a pad and apply the pad impregnated with liquid nitrogen to the skin. The gas-phase gas gives off cold which causes second degree burn and necrosis of the skin. For each application, a new buffer is needed.

Also known is a spray with a button that must first turn to arm a spring. Upon actuation of the device, the vial valve opens for a period of time defined by the spring previously armed. The nitrogen jet is directed directly at the wart. The dose is therefore defined by the duration of the spray which itself is controlled by the spring.

Furthermore, there is known for example from FR 2,046,021 A a liquid product dosing device comprising a dosing chamber consisting of a membrane stretched over a base plate. An opening is made on this base plate and opens into a perpendicular tip. When pressing the push button, the base plate is lowered and the end of the tip is placed on the valve of the pressurized bottle. The product under the effect of the propellant fills the metering chamber causing the deformation of the elastic membrane. When the push button is released, the membrane returns to its normal shape by expelling the product through the opening and the tip whose end is now in front of a diffusion tube. This metering chamber is not suitable for a gas.

The object of the invention is to provide a diffuser for diffusing a precise dose of gas, preferably in the form of a jet having a temperature determined at the point of application.

This object is attained by the fact that the inlet opening and the outlet opening are distinct and in that the dosing chamber is constituted on the one hand by a cup-shaped part in the bottom of which is made the inlet opening and secondly a cover that can slide in the bucket and in which the outlet opening is made, a plug having dimensions complementary to those of the outlet opening being fixed in io the bucket-shaped element so that when the lid is pressed into the bucket, the cap closes the outlet opening, while this opening is free as soon as the lid leaves this depressed position.

It is preferable to provide means for moving the lid away from the bucket-shaped element in the absence of stresses, these means being preferably constituted by a spring disposed outside the bucket-shaped element, supported on one side on a shoulder formed on the bucket and on the other side on an extension of the lid. Thus, in the rest position, the cover will be in the up position (spaced apart) and the open outlet opening. In order to facilitate actuation of the device, means may be provided for lowering the cup-shaped element after the outlet opening has been closed when the device is mounted on a pressurized bottle. These means can be operated manually or mechanically. In order to facilitate the use of the device, it is in accordance with the invention to provide means for keeping the bucket in a low position in which, when the device is mounted on a pressurized bottle, the nozzle actuates the stem of the pressurized bottle. . Thus, the user will first arm the device and fill the metering chamber. The device will be locked in this position to allow the user to place the device at the application site and the blocking means will be released once this position is reached.

In order to allow the liquid gas to expand by causing the desired cold, it is preferable to provide the device with an expansion bell located in the extension of the outlet opening to the outside of the chamber, said bell being preferably provided with a central orifice located opposite the outlet opening through which the jet of gas and at least one side window can exit for the equilibrium of the pressures.

The device is provided with means for fixing it on a pressurized bottle. These means may be constituted by a bead / shoulder intended to snap behind crimping the vial cup. They can also be constituted by a housing integral with the metering and dispensing device and closed at the bottom by a hood.

In an exemplary preferred embodiment of the invention, the metering and dispensing device comprises a fixing element, an actuating ring and an inner member, the metering chamber being constituted on the one hand by the organ interior comprising a cup-shaped element consisting of a cylindrical wall closed at the bottom by a radial bottom in which is formed the outlet opening into which the mouthpiece for actuating the stem of a pressurized bottle, and secondly by the actuating ring 15 comprising a radial wall on the lower face of which is formed a first circular rib surrounding the outlet opening and a second circular rib whose outer dimensions substantially correspond to the inner dimensions of the cylindrical wall of the cup-shaped element, the outlet opening being closable by a cone fixed to the radial wall of the bottom of the internal organ and penetrating into the corresponding frustoconical first rib surrounding the outlet opening.

It is preferable that the fixing element is provided with means for attaching it to a pressurized bottle as well as means for locking the actuating ring in a low position, said locking means preferably being in the form of two latches. . When the device is intended for cryotherapy, it is preferable to provide the fixing element with a bell situated above the outlet opening, which bell is provided with a central orifice and at least one window lateral.

The actuating ring is for example constituted by a cylindrical wall inside which is fixed the radial wall, preferably by fixing lugs, the cylindrical wall being provided with means intended to cooperate with locking means. located on the fastener.

The inner member can penetrate, with its closed side by the radial wall, inside the fastening element into an opening made in a radial surface attached to the inside of the cylindrical wall of said fastener member. shoulder placed on the outer face of the cylindrical wall of the inner member limiting the penetration thereof inside the opening, a spring being placed around the cylindrical wall of the inner member between the shoulder and the radial wall of the actuating ring. In order to ensure the prior closure of the outlet opening before the opening of the vial valve during the lowering of the actuating ring, and vice versa the prior closure of the valve before the release of the opening of when the locking means are released, it is preferable that the means used to separate the bucket cover are sized so that the force to compress these spacing means is less than the force required for the opening of the valve of the bottle.

The invention also relates to a device mounted on a bottle of gas under pressure.

In an alternative embodiment, the fastening element continues in its lower part by a cover covering at least partly the bottle and can be closed at the bottom by a cover, the cover and the cap serving as fixing means.

In the remainder of the description, the invention is described in more detail with the aid of the following figures:

Figure 1 is a perspective view of the device in the rest / diffusion position; Figure 2: perspective view of the device in the armed position; Figure 3: sectional view of the device in the rest / diffusion position; Figure 4: sectional view of the device in the armed position; Figure 5: Exploded sectional view; Figure 6: Sectional view of an alternative embodiment without cache in the armed position; Figure 7: View (a) in perspective and (b) in section of a fastener according to the first embodiment; Figure 8: Perspective view (a) and (b) sectional view of an inner member; Figure 9: View (a) in perspective and (b) in section of an actuating ring; Figure 10: View (a) in perspective and (b) in section of a bell; Figure 11: View (a) in perspective and (b) in section of a metal needle.

The dosing and dispensing device according to the invention, hereinafter referred to as the diffuser (1), is intended to be snapped onto a pressurized bottle (2) containing liquid gas under pressure, such as liquid nitrogen, for example. Rather than snap the diffuser (1), it can be integrated into a container inside which is placed the pressurized bottle (2).

The bottle conventionally comprises a valve (21) ending on the outside with a stem (22). When the stem (22) is depressed, the valve is opened and the gas can escape through the stem (22).

For the sake of simplicity, the orientation of the parts or diffuser is made by reference to the bottle as shown in Figure 1. Thus, when reference is made to the underside of an element, it is necessary to understand the face downwards when this element is integrated in the diffuser positioned according to Figure 1. It goes without saying that it is not absolute spatial references and that when the diffuser is put upside down, for example for the use, a lower face becomes an upper face.

The diffuser of the invention consists essentially of a fastening element (11) for securing it to the pressurized bottle (2), an actuating ring (12), an inner chamber member (14) dosage and, as an option, a bell (13) preferably secured to the fastening element (11).

The inner member (14) consists of a cylindrical wall (141) closed at the bottom by a radial bottom (142). On the outer face of the cylinder (141), there is provided a shoulder (143) which serves as a support for a spring (144). An opening (145) is made in the bottom (142). On the side of the cylindrical wall (141), the opening (145) is surrounded by a cone (146).

At least one opening (146a) is provided at the base of the cone for contacting the interior of the cone (146) with the space between the cone (146) and the cylindrical wall (141). On the opposite side to the cylindrical wall (141), the bottom is provided in the extension of the cone (146) of a nozzle (147) for cooperating with the stem (22) of the pressurized bottle (2). The tip (147) opens into the opening (145), said inlet opening.

The actuating ring (12) consists of a cylindrical wall (121) and a radial wall (122) located inside the cylindrical wall (121). The radial wall (122) is attached to the cylindrical wall (121) by three tabs (128) evenly distributed around the circumference of the radial wall (122). Between these three tabs (128) there are therefore three spaces (128a) in the shape of an arc of a circle flush with the cylindrical wall (121). On the outer face of the cylinder (121), there are provided two shoulders (123) which serve as a stop for retaining elements described below. An opening (124) is formed in the center of the radial wall (122). On the underside of the radial wall (122) there is provided around the opening (124) a first circular rib (125). The inner wall of this rib (125) has the shape of a truncated cone wider at the bottom than at the top. This frustoconical opening ends with a stop (126). The dimensions of the frustoconical opening correspond to the dimensions of the tip of the cone (146) of the inner member (14). Around the first circular rib (125), there is a second circular rib (127) whose outer diameter substantially corresponds to the inner diameter of the wall ~ o cylindrical (141) of the inner member (14). Two protrusions (129) are symmetrically placed on the outer face of the cylindrical wall (121), offset by 90 ° from the stops (123) for the retainers (117). These projections serve as a support for lowering the actuating ring as explained below. In order to ensure a precise jet, it is preferable to provide the opening (124) with a metal needle (15). This metal needle is constituted by a tubular element whose inner diameter is very precisely made. It will be for example 0.17 mm, which is not easily achievable with a plastic part. When such precision is not necessary, it is of course possible to give up this metal needle or to replace it with a plastic nozzle which may if necessary be an integral part of the radial wall (122) of the ring. actuator (12).

The fixing element (11) consists of a cylindrical wall (111) and a radial wall (112) located inside. The inner face of the cylindrical wall (111) is provided in its lower part with a circular shoulder (113) intended to snap under the crimping edge of the cup (23) of the pressurized bottle (2). The radial wall (112) is provided with an opening (114) whose dimensions are such that the cylindrical wall (141) of the inner member can penetrate in its closed side by the bottom (142), but not the shoulder (143). The inner member (14) can slide within this opening (114) to the shoulder (143). The cylindrical wall (111) continues in its upper portion by three tabs (115) which are dimensioned to penetrate and slide through the arcuate openings (128a) in the radial wall (122) of the ring. actuation (12). These tabs (115) terminate in abutments (116) serving as bell retaining means (13). Two latches (117) are symmetrically placed on the outer face of the cylindrical wall (111). These latches are fixed on the cylindrical wall by film hinges. They serve as retaining elements and engage behind the stops (123) of the actuating ring (12) when it is lowered. The fastening element (11) can continue past the shoulder (113) by a tubular portion (121a) for hiding the pressurized bottle (2). This tubular portion may be closed at the bottom by a cover (121b) in which case it is possible to give up the shoulder (113).

The bell (13) consists of a cylindrical wall (131) closed in its upper part by a radial wall (132). A circular stop (133) is formed on the inner face of the cylindrical wall (131). In the mounting position, this stop engages ~ o behind the stops (116) of the tongues (115) of the fastening element (11). A central opening (134) is made in the center of the radial wall (132). Four windows (135) are formed at the junction between the cylindrical wall (131) and the radial wall (132). These windows allow the liquid gas, when it is propelled, to go into the gas phase inside the bell. The height of the bell depends on the gas to be diffused and the desired temperature at the outlet of the central opening (134).

The diffuser of the invention operates as follows. The inner member (14) is placed in the opening (114) of the radial wall of the fastening element (11) so that it is retained by its shoulder (143) resting on the upper face of the the radial wall (112) of the fastening element (11). The spring (144) is placed around the outer face of the cylindrical wall (141) of the inner member (14). The actuating ring (12) is then put in place with its second circular rib (127) placed inside the cylindrical wall (141) of the inner member (14). The tabs (115) are passed through the arcuate openings (128a) made in the radial wall of the actuator ring. The spring (144) abuts against the upper face of the shoulder (143). Finally, the bell (13) is placed at the top of the fastening element (11), its stop (133) snapping behind the abutments (116) at the ends of the tongues (115) of the fastener element. . As can be seen in FIGS. 3 and 4, the circular abutment (133) fits into a recess so that the bell (13) is fixed relative to the fixing element (11). In order to avoid that the abutment (133) of the bell comes out of this recess, it is preferable that the cylindrical wall (121) of the actuating ring is extended by a flange (121a) so that the latter covers always the lower part of the bell carrying said circular stop (133).

As shown in FIGS. 3 and 4, the inner member (14) and the actuating ring (12) together form a metering chamber (C). At rest, the spring (144) tends to move the inner member (14) and the actuating ring by pushing the latter upwards without leaving the bucket. The tip of the cone (146) is opposite the frustoconical opening (124) without touching it so that the chamber (C) is open upwardly on the outside via the opening (124) and, if appropriate the metal needle (15). This is the position shown in FIG. 3. The upper edge of the cylindrical wall (141) of the inner member does not abut against the lower face of the radial wall (122) of the actuating ring. .

At first, the user must take the dose of gas. For this, he presses the projections (129). The actuating ring (12) is lowered against the effect of the spring (144) and the lower face of the radial wall (122) of the actuating ring abuts against the upper edge of the cylindrical wall (141). ) of the inner organ. Simultaneously, the cone (146) of the inner member abuts against the opening (124) of the actuating ring. The metering chamber (C) is now hermetically sealed to the outside. Continuing to lower the actuating ring (12) simultaneously causes the lowering of the inner member (14). Its tip (147) then abuts against the stem (22) of the pressurized bottle. The ring continues to be lowered causing the opening of the valve (21) of the bottle and the escape of the gas into the chamber (C) closed towards the outside. At the end of the stroke, the shoulder (143) abuts against the radial wall (112) of the fastener and the latches (117) engage behind the shoulder (123) of the actuating ring. . This is the situation presented in Figures 4 and 6.

The actuating ring is now locked in the low position and the metering chamber (C) is filled with a quantity of gas under defined pressure. for example under a pressure of 3.5 bars. It is now possible to place the bell with its central opening (134) in contact with the skin at the wart to be treated. When this position is reached, the user only has to release the latches (117) by pressing on their lower ends. Under the effect of the pressure in the bottle (2), the inner member (14) is pushed upwardly, driving with it the actuating ring (12). The valve (22) is closed. Under the effect of the spring (144), the actuating ring (12) is separated from the inner member (14) and the opening (124) is again released, allowing the gas to escape through the needle metallic. By passing into the gas phase, the jet of gas cools and when it reaches the central opening and therefore the wart, it has reached the desired temperature. The junction between the endpiece (147) and the stem (22) is hermetically sealed to the outside regardless of the position of the inner member (14) and the actuating ring (12). The gas can not escape at this level.

The two springs (144, 24) are dimensioned so that when lowering the actuating ring, it is first the spring (144) of the metering chamber (C) which yields to ensure firstly closing the outlet opening (124) of the chamber (C) before the opening of the valve (21) of the bottle, while at the time of release of the ~ o actuating ring firstly the valve (21) of the bottle which closes before the outlet opening (124) of the chamber (C) is released in turn.

It should be noted that the cylindrical shape of the walls (111, 121, 131, 141) does not imply that the cylinder has the same section over its entire height. For example, the cylindrical wall (131) of the bell has in the example shown a frustoconical shape.

The example presented in the above description relates to a spray for the treatment of warts by cryotherapy. It is obvious that this device may have other applications. The lowering of the actuating ring need not be done manually. It is quite possible to provide for the automatic depression of the ring by a triggering effect, such as the opening or closing of a door, while another event will release the locking means. Under these conditions, the presence of the bell is not essential and it can very well be removed without interfering with the operation of the metering device.

25 List of references: 1 Diffuser 2 Pressurized facon 30 21 Valve 22 Stem 23 Cup 24 Valve spring 11 Fixing element 35 111 Cylindrical wall 30 35 111a Cover 111 b Hood cover 112 Radial wall 113 Shoulder 114 Opening 115 Tabs 116 Stoppers for Bell 117 Latches 12 Actuating ring 121 Cylindrical wall 121a Collar 122 Radial wall 123 Shoulder 124 Opening 125 1st circular rib 126 Stop 127 Second circular rib 128 Clamps 128a Arches in the shape of an arc 129 Stiles 13 Bell 131 Cylinder wall 132 Radial wall 133 Circumferential stop 134 Opening 135 Lateral window 14 Inner member 141 Cylinder wall 142 Radial bottom 143 Shoulder 144 Spring 145 Inlet opening 146 Cone 146a Openings in cone 147 End cap 11

Claims (16)

Revendications1. Dosing and dispensing device for a bottle (2) provided with an outlet valve (21) equipped with a stem (22) and containing a gas under pressure, composed of a metering chamber (C) provided with an inlet opening (145, 146a) into which a mouthpiece (147) opens to cooperate with the stem (22) of the pressurized bottle (2) to allow the gas to enter the dosing chamber (C), and to an outlet opening (124) allowing the gas contained in the metering chamber (C) to exit from said metering chamber, characterized in that the inlet opening (145, 146a) and the outlet opening are distinct and in that the dosing chamber (C) is formed on the one hand of a cup-shaped part (14) in the bottom (142) of which the inlet opening (145, 146a) is formed and on the other hand a cover (122, 127) slidable in the cup (14) and in which the outlet opening (124) is formed, a stopper (146) with dimensions complementary to that s of the outlet opening (124) being secured in the cup-shaped member (14) so that when the cover (122, 127) is driven into the cup, the plug (146) seals the opening output (124), while this opening is free as soon as the lid leaves this depressed position. 2. Device according to the preceding claim, characterized in that means are provided to separate the cover (122, 127) of the cup-shaped element (14) in the absence of stresses, these means being preferably constituted by a spring (144) disposed outside the bucket-shaped element (14), bearing on one side on a shoulder (143) formed on the bucket and on the other side on an extension of the lid. 3. Device according to claim 2, characterized in that means are provided for lowering the cup-shaped element (14) after the outlet opening (124) has been closed when the device is mounted on a pressurized bottle. (2). 4. Device according to one of claims 2 to 3, characterized in that means are provided to maintain the bucket (14) in the lower position in which, when the device is mounted on a pressurized bottle, the tip actuates the stem (22) the pressurized bottle (2). 35 5. Device according to one of the preceding claims, characterized in that it is provided with a dilation bell (13) located in the extension of the outlet opening (124) outside the chamber (C). ), said bell (13) being preferably provided with a central orifice (134) situated opposite the outlet opening (124) through which the gas jet and at least one lateral window (135) can exit. . 6. Device according to one of the preceding claims, characterized in that it is provided with means (113) for fixing it on a pressurized bottle (2). 7. Device according to one of the preceding claims, characterized in that it comprises a fixing element (11), an actuating ring (12) and an inner member (14), the metering chamber (C) being formed on the one hand by the inner member (14) comprising a cup-shaped element consisting of a cylindrical wall (141) closed downwards by a radial bottom (142) in which the outlet opening (145) is formed; , 146a) into which the tip (147) for actuating the stem (22) of a pressurized bottle opens, and secondly by the actuating ring (12) comprising a radial wall (122) on the face lower of which is formed a first circular rib (125) surrounding the outlet opening (124) and a second circular rib (127) whose outer dimensions correspond substantially to the internal dimensions of the cylindrical wall (141) of the element. bucket shape, the outlet opening (124) being closed by a cone (146) fixed on the radial wall of the bottom (142) of the inner member (14) and penetrating into the first rib (125) of corresponding frustoconical shape surrounding the outlet opening (124). 8. Device according to the preceding claim, characterized in that the fastening element (11) is provided with means (113; 111a, 111b) to fix it on a pressurized bottle (2). 9. Device according to claim 7 or 8, characterized in that the fastening element (11) is provided with means for locking in the lower position the actuating ring (12), said locking means being preferably made under the form of two latches (117). 10. Device according to one of claims 7 to 9, characterized in that the fastening element (11) is provided with a bell (13) located above the outlet opening (124), which cloche (13) is provided with a central opening (134) and at least one side window (135). 11. Device according to one of claims 7 to 10, characterized in that the actuating ring (12) consists of a cylindrical wall (121) inside which is fixed the radial wall (122), preferably by fixing lugs (128), the cylindrical wall (121) being provided with means intended to cooperate with locking means (117) located on the fastening element (11). 12. Device according to one of claims 7 to 11, characterized in that the inner member (14) penetrates with its closed side by the radial wall (142) inside the fastener in an opening ( 114) made in a radial surface (112) fixed to the inside of the cylindrical wall (111) of said fastening element, a shoulder (143) placed on the outer face of the cylindrical wall (141) of the limiting inner member the penetration thereof inside the opening (114), a spring being placed around the cylindrical wall (141) of the inner member (14) between the shoulder (143) and the radial wall ( 122) of the actuating ring (12). 13. Device according to one of claims 2 to 12, characterized in that the means (144) for moving the cover (122, 127) of the bucket (14) are dimensioned so that the effort to counter these means of distance (144) is less than the force required to open the valve (21) of the bottle (2). 14. Device according to one of the preceding claims, characterized in that it is equipped with a flask of gas under pressure. 15. Device according to the preceding claim, characterized in that the fastener continues in its lower part by a cover (111a) covering at least partly the bottle. 16. Device according to the preceding claim, characterized in that the cover (111a) covers the entire bottle and is closed at the bottom by a cover (111b), the cover and the cap serving as fixing means.