SINGLE-USE, NON-REUSABLE PLASTIC MEDICAL SYRINGE: NEUTRALIZATION RESULTING FROM A CHEMICAL REACTION THAT SECTIONS THE PISTON HANDLE.

Abstract

Un dispositif à ergot interessant la partie rétrécie du manche et la pièce FST stabilise le contact entre les deux substances chimiques. Un modèle a une ou deux bagues enserrant la même partie du manche et portant les substances chimiques contribue au même but car ces bagues, une fois le"contact chimique" établi, deviennent solidaires du manche dans tous ses mouvements. Lors du début de la poussée d'injection la pièce en forme de section de tube (FST) serrée dans la lumière de la seringue et surmontant la tête du piston résiste un peu et compime les deux bagues (modèle à deux bagues) qui sont solidarisées durablement, garantissant une réaction chimique éfficace.

Description

The new diluents introduced are: - Modifications allowing for sustained contact between the two chemical substances intended to react, using the heat thus produced, to sever the piston handle made of a plastic with a very low melting point. This prevents small, successive pushes with piston retraction that could make a clear and effective chemical reaction impossible. - Ways to further weaken the piston shaft at the site of chemical action, through gutters and perforations. Thus, during the injection push, as soon as the chemicals come into contact, the narrowed lower part of the sleeve engages the tube-shaped section (FST) (held tightly in the syringe chamber) via two stages of lugs. The upper stage fits into recesses in the FST, while the lower stage is positioned on the underside of the FST. Therefore, retracting the plunger raises the FST and maintains contact between the two chemicals. In another embodiment, without lugs, the lower substance is distributed on a ring, made of plastic or cardboard for example, which fits snugly into the middle part of the narrowed section of the handle. This ring has, on the inner circumference of its upper edge, a circumferential seat on which the chemical substance is fixed. This ring rests on the FST part. During the injection stroke, the chemical substance fixed to the piston handle moves down towards the chemical substance fixed to the stationary ring, which rests on the FST part, tightened in the syringe chamber. In doing so, the ring slides upwards around the narrowed section of the handle, which it slightly tightens (relative movement). Thus, the two chemical substances cannot separate because the ring, in the event of the handle rising, rises with it. In another embodiment analogous to the previous one, the chemical substance in the upper position is distributed, not on the handle, but on the inner part of the lower edge of another ring placed to the left of the previous one at a distance of a few millimeters. The lower ring rests on a simplified part, a simple washer inserted into the syringe's lumen. The "chemical contact" occurs at a groove cut into the part Average of the narrowed part of the handle0An internal groove is also hollowed out at the levelOThis last embodiment has the advantage of facilitating the addition of the chemical equipment which is added at the last moment by smoothing the position of the two rings, The part of the handle intended to undergo "chemical attack" will be considerably weakened by internal and external grooves, as well as by strategically placed perforations. Among the possibilities: - an external groove with perforations leading to an internal groove at the same level; - an external groove traversed and framed by three rows of perforations, each row leading, internally, to the bottom of one of the three small adjacent internal grooves; - an external groove with three rows of perforations leading, internally, to a wide "trench" thinning the wall Figures 1 to 10 illustrate the addendum to the invention Figures 1 and 2 show the lug device. Figures 3 and 4 illustrate the chemical substance carrier ring model. Figures 5, 6 and 7 illustrate the two-ring chemical carrier model, Figures 8, 9 and 10 illustrate modes of embrittlement of the piston handle. Figure 1 shows the lugs (I) protruding from the narrowed part of the handle. In (2) the small cavity cut into the FST part (3). Figure 2 shows the lugs in place from the start of the injection process. The contact between chemical substances 4 and 5 is stabilized. Figure 3 shows the model with ring(6) slightly tightened on the handle and resting on the FST part (7). Figure 4 shows that the contact which takes place between the chemical substances from the beginning of the injection push is durable if the operator withdraws the piston handle a little, because the bar(6) remains tight around this manome. Figure 5 shows the model with three rings, one upper (b) carrying the chemical substance (9), the other lower (l0) carrying the chemical substance (ii). The part (12), clamped in the light of the syringe is here in the form of a simple washer. Figure 6 shows the chemical contact from the beginning of the injection thrust. Figure 7 shows what happens when the operator attempts to proceed by small pushes with immediate withdrawal of the handle. The chemical reaction is not compromised because the ring (1O), tightened on the handle, is fixed in translation with it. Figure 8 shows the method of weakening the handle with an additional internal groove and a row of perforations. Figure 9 shows the model with three adjacent internal gutters (l4), with three rows of perforations. Figure 10 shows an internal arrangement in tr mchec(l5) with three rows of perforations. It is possible that the plastic material chosen, with its sufficiently low melting point, may not be rigid enough for manufacturing the piston handle. In this case, a sufficiently hard piece, made of another type of material, will be inserted into the center of the handle and will serve as a support. However, it must be free of any fixings and slide quite freely inside the handle. It will in no way impede the separation of the two halves of the handle after the chemical reaction that will sever it. It should be noted that the substances intended to react with each other can be very pure. For example, grains of pure sodium can be embedded in a very thin and fragile area of ​​the piston handle, while the substance in the lower position (applied to a cross-section of an FST tube or a ring) is represented by water, forming a viscous substance. The contact between the pure sodium grains and the water causes an explosion of the pure sodium grains, resulting in micro-shredding and thus cutting of the handle. This micro-explosion, in a very limited area, is perfectly acceptable. The chemical device used is particularly interesting due to its complete safety and low cost.

Claims

-DEMANDS 1 - Syringe according to claims 1 to 4 of the main patent to which the certificate of addition relates, characterized in that, at the start of the injection stroke, as soon as the chemical substances (4) and (5) are in contact, the narrowed inner portion of the handle engages the tube section (FST)(3) (which remains clamped in the lumen of the syringe) with two stages of lugs (1). The upper stage fits into the concavities (2) hollowed out in the part (3) while the lower stage is positioned on the underside of this same part (FST) (3). Retracting the plunger raises the part (3) and maintains contact between the two chemical substances (4) and (5). 2 - Syringe according to claim 1 of the main patent characterized in that the lower chemical substance is distributed on a ring(6), made of plastic or cardboard for example, which fits the middle part of the narrowed part of the handle by tightening it sufficiently. This ring has, on the inner circumference of its upper edge, a circumferential seat on which the chemical substance is fixed. This ring rests on the part (FST)(7). Characterized in that, during the injection thrust, the chemical substance fixed to the piston handle descends towards the chemical substance fixed to the stationary ring resting on the part (PST) (7) clamped in the bore. In doing so, the ring (6) slides upwards around the narrowed part of the handle, which it slightly clamps. In fact, this is a relative movement because the ring (6) is impaled by the descending handle. Thus, the two chemical substances cannot be separated because the ring (6), in the event of the handle rising, rises with it. 3 - A syringe according to claim 2 (preceding) characterized in that the chemical substance (9) in the upper position is distributed not on the handle, but on the inner part of the lower edge of another ring (8) placed above the previous one (10) at a distance of a few millimeters. The lower ring (10) rests on a simplified part (12) in the form of a simple washer inserted into the lumen of the syringe. The "chemical contact" occurs at a groove cut into the middle part of the narrowed section of the handle. An internal groove is also cut at the same level. During assembly, the two rings (8) and (10) carrying the chemical substances are added at the last moment. 4 - Syringe according to any one of the claims part (including those of the main patent characterized in that the part of the piston handle intended to undergo "chemical attack" is considerably weakened by both an external groove and an internal groove (l3)(located at the same level) into the bottom of which perforations distributed around the perimeter open. 5 - Syringe according to any one of the aforementioned claims--- slow including those of the main patent characterized in that the part of the piston handle intended to undergo "chemical attack" is considerably weakened both by an external groove and by a series of three small adjacent grooves(l4) located at the same level. Three rows of perforations lead to the bottom of the small gutters, which they connect to the outside. 6 - Syringe according to any one of the preceding claims including that of the main patent characterized in that the part of the piston handle intended to undergo "chemical attack" is considerably weakened, both by an external gutter and an internal trench(lr) located at the same level. Three rows of circumferentially distributed perforations perforate the wall at this same level. 7 - Syringe according to any one of the preceding claims including that of the main patent characterized in that the piston sleeve is centered by a sufficiently hardened support which is inserted quite freely without any fixing. It will in no way oppose the separation of the two halves of the sleeve after the chemical reaction which will cut it. 8 - A single-use, non-reusable medical syringe made of plastic, according to any one of claims 1, 2, or 4 of the main patent or any one of the claims of the certificate of addition, characterized in that the chemical substance distributed over a thinned and weakened area of ​​the piston handle consists of pure sodium granules embedded in the wall, while the substance in the lower position, distributed over a tube-shaped cross-section (FST) or a ring, is represented by water forming a viscous substance. Contact between the pure sodium granules and the water causes the pure sodium granules to explode, resulting in the micro-shredding of the handle.