ITPT970005A1 - DISPOSABLE SYRINGE WITH CONCEALED NEEDLE WITH REDUCED NUMBER OF COMPONENTS - Google Patents

Description

DESCRIPTION OF THE PATENT FOR INDUSTRIAL INVENTION TITLE: "DISPOSABLE SYRINGE WITH CONCEALABLE NEEDLE WITH REDUCED NUMBER OF COMPONENTS"

The subject of this patent for industrial invention is a special syringe alternative to the normal syringes for intravenous, intramuscular, subcutaneous and intradermal injections with the particularity of being able to be used only once as an internal device calls up the needle at the end of the use (injection in general) in a suitable cavity parallel to that of the liquid where the injection plunger flows.

In the current state of the art, there are traditional disposable syringes in single and sealed packaging, which however do not have any device capable of blocking either the plunger or the needle after the first use and which therefore can in any case be reused even by different people, acting as a vehicles of contagion as now known to all.

Yes, it should be noted that Ms. Danesi Paola, one of the applicants for this industrial patent, has also already filed other patents, making syringes having various devices which produce the effect of drawing the needle inside the syringe itself by means of elastic devices such as springs or elastomers or compressed air.

The patents cited are as follows:

- Patent for industrial invention entitled "SYRINGE WITH RETRACTABLE NEEDLE WITH AUTOMATIC MECHANISM" filed on 06/28/91, Sun. n. PT 91 A 000014 in the name of Danesi Paola and Pasquìni Alessandro.

- Patent for industrial invention entitled "DISPOSABLE RETRACTABLE NEEDLE SYRINGE" filed on 02/28/92, Sun. n. PT 92A 000005 in the name of Danesi Paola.

- Patent for industrial invention entitled "DISPOSABLE RETRACTABLE NEEDLE SYRINGE" filed 02/02/93, Sun. n. PT 93 A 000005 in the name of Danesi Paola.

- Patent for industrial invention entitled "DISPOSABLE SYRINGE WITH CONCEALING NEEDLE", filed on 23/02/93, dep. n. PT 93 A 000006 in the name of Danesi Paola.

None of these patents has ever had an industrial or commercial follow-up, while offering functional ideas that are also conceptually valid.

Compared to the aforementioned, the present industrial patent and related product has the advantage of reducing the costs of industrial construction by virtue of the extremely reduced number of components to be assembled which constitute it; this feature suggests a certain industrial feasibility.

In addition to the needle, the present syringe consists of the following elements, namely the main body, a plunger, two equal springs (compression), and a needle holder.

The attached tables (n. 1,2,3 and 4) are not limiting, but descriptive, they contain both the elements making up the invention, the indications representing the essential characteristic elements, and the operating specifications; therefore the following meanings are attributed to the numbers and numbers and letters indicated on them.

1 Main body of the syringe in translucent plastic completely identical to those of normal disposable syringes; it is made up of two coaxial cavities: one, which acts as a reservoir and one which acts as a container for the needle return mechanism. -a - reservoir of the liquid intended for injection, cylindrical in shape, smooth and finished, such as to act as a barrel for a piston represented here by the piston 2 and its gasket 2-b.

-b - Container of the needle return mechanism; it has an almost rectangular section, but shaped on two edges by the two cavities with a circular section 1-g suitable for containing the springs 4, and on two side walls by two female prismatic guides 1-c

-c - Female prismatic guide (also called dovetail), allows the containment and sliding of the (male) sliders 2-c, obtained on the parallel rods of the piston 2.

-d - Oblique surface of the prismatic termination of fins 1-i

-e - Contact area (conical) between the needle holder and the syringe body in order to create a tight coupling between the two elements and connect the medical liquid passage holes of the syringe body to that of the needle holder .

-f - Hole in the main body of the syringe that connects it with the needle holder.

-g - Cylindrical guides, arranged on two edges of the container 1-b, allow the positioning, in their lower part, of the return springs of the needle holder and operate as cylindrical linear guides for the vertical sliding of the cylinders 3-b placed at the end top of the needle holder.

-h - Pair of circular crown teeth designed to lock the needle holder 3.

-i - Fins carrying the teeth 1-h and the prismatic termination with oblique surface 1-d.

-1 - Hole necessary for the realization of 1-f in the molding or processing phase. - Plunger in plastic material similar or equal to that of 1, it has a support or thrust surface to which, in addition to the rod, two rods with two prismatic or dovetail male guides are connected.

-a - Generally cross-sectioned piston rod for reasons of compressive strength and molding.

-b - Gasket in elastic rubber material for sanitary uses, produces the thrust on the medical liquid towards the needle.

-c - Vertical rods parallel to the axis of the plunger that keep the plunger in guide and carry the two 2-d wedges at the head, one longitudinal side of each rod is shaped as a prismatic guide or movable (male) slider that slides in the prismatic guides 1-c.

-d - End elements of the wedge-shaped guides 2-c, are intended to unlock, at the end of the piston stroke, the two ring-shaped teeth 1-h thus allowing the needle holder to retract.

-e - Support surface on which the pressure of the fingertip is exerted during the injection phase in a completely similar way to what happens in common syringes currently on the market.

- Needle holder in material similar or similar to 1 and 2, consisting of a truncated cone lower part, internally perforated, for the passage of the medical liquid and a cylindrical upper part which, by contrasting 1-d, guarantees the locking of the needle holder itself; integral with the head of the needle holder 3-e are two cylinders with an axis parallel to that of the needle which oppose the pair of springs 4 located within the guide channels 1-g.

-a - Cavity of the needle holder made by two orthogonal holes to each other, allows the passage of the medical liquid by putting the tank 1-a, through 1-f, in communication with the needle 5. -b - Cylinders integral with 3 a means of two 3-c fins; they keep the springs 4 in the guide and keep the springs 4 in compression thus realizing the return element of the needle holder in addition to the guide element.

-c - Connecting tabs of the cylinders 3-b to the body of the needle holder.

-d - Pyramidal protuberances but with conical surfaces, create the aforementioned sealing coupling between the needle holder and the conical surface (1-e) of the main body, free from infiltrations or leaks.

-e - Head of the needle holder which serves as a hooking surface for the 1-h teeth.

-f - Circular section elastic ring, universally known as O-ring to be inserted in a special milling on the external surface of 3-d, can be a valid alternative to direct 3-d / l-e coupling in avoiding liquid leakage from the hole 3-a.

- Compression springs are placed inside the cylindrical channels 1-g where the two cylinders 3-b also slide; they are compressed at the time of assembly by the latter and thus remain until the needle holder is released, ie at the end of the injection.

- Needle, similar to any syringe needle. - Male prismatic element in the shape of a bridge with elastic fins 22-a, separated and distinct from the piston 23.

2-a - Elastic fins, integral with 22, with teeth arranged on a horizontal axis, ie perpendicular to the axis of the pair of guides 2-c and parallel to 23-a where they are intended to be inserted.

23 - Plunger ending with a support surface having a slot and a sleeve 23-b, of similar rectangular section, which contain the element 22, initially free.

23-a - Elastic fins with horizontal axis tracks for locking 22 by means of 22-a.

23-b - Sleeve with an almost rectangular section for containing and guiding 22 during vertical sliding.

24 - Coupling position between 22 and 23 by means of 22-a and 23-a.

The attached tables n. 1 and n. 2 describe the components which constitute the object of this industrial patent, which, although in very small numbers, have many particularities. Table no.

3 shows the assembly of the various components in the order of insertion into the body and the sequence of operation, while in table n. 4 shows some significant variants. Having said this, a description of the operation of the invention is proceeded with reference to the attached tables. Exercising the current function of operating an intravenous, intramuscular, subcutaneous, intradermal or other injection, the following occurs: the manual traction exerted on the head of the plunger 2 transmits the pressure necessary to aspirate the medical liquid that passes through the needle 5 and subsequently into the duct 3 -a of the needle holder 3, which is perfectly coupled and aligned with the through hole present on the conical surface 1-e and flows through it into the cylindrical cavity of the main body in the quantity determined by the operator. Once this necessary and sufficient phase has been completed, and the normal expulsion of any residual air present in the cylindrical cavity of the syringe has been carried out, the necessary pressure is applied on the head of the plunger 2 to inject the medical liquid and therefore the plunger 2 through the gasket 2-b advances in the cylindrical section 1-a pushing the liquid with a path that is the reverse of that described above. At the same time the vertical rods 2-c, integral with the piston itself, advance in the dovetail prismatic guides 1-c. When the piston with its gasket has not yet reached the end of its stroke, the two wedge-shaped ends 2-d of the rods 2-c begin to spread the wings 1-i. Upon reaching the end of stroke of the plunger the sliders 2-d complete the rotation of the fins 1-i around their base so that the circular crown teeth 1-h, integral with the fins themselves, no longer geometrically retain the circular head 3-e of the needle holder 3: in this way the cylindrical heads 3-b, connected by 3-c to the body of the needle holder 3, which kept the two springs 4 compressed in the two cylindrical cavities 1-g, are free to slide in the same cavity; the thrust generated by the extension of the two springs 4 raises the needle holder 3 and the relative needle 5 making it re-enter completely and definitively inside the prismatic cavity of the syringe, preventing any subsequent escape.

For the device to function correctly, it is also necessary to highlight the specific functions of the various parts of the needle holder 3: during the assembly phase of the invention, the needle holder is inserted into the prismatic cavity by spreading the elastic tabs until, in correspondence with the narrowing of the section of the head 1-e of the needle holder, the circular crown teeth 1-h return to close again, compressing the head itself and transmitting this pressure, through the rods of the needle holder shaft, subjected to pressure-bending, to the terminal part of the body 3 which laterally has two protuberances with frusto-conical surfaces which couple to the analogous conical surfaces present on the main body; the above mentioned compression guarantees the adherence between the surfaces and therefore the seal against liquid leakage.

The assembled, packaged and ready-to-use invention presents the plunger in such a position that the end of the gasket 2-b does not exactly touch the bottom of 1-a, a further advance of 2 would cause the release of the needle holder, therefore the The operator in the phase of recalling the liquid from a vial will not start with the plunger pushed to the lower end of the tank, but with the same higher by a few millimeters in the position in which he will find it packaged. This is generally not a problem as the syringe is normally turned over and the air is expelled before proceeding with the injection.

If the pre-existing quantity of air is to be avoided, the phase of aspiration of the medical liquid is provided for a variant to the invention, shown in table. 4, which, by making the plunger and the 2-c guides initially independent from each other, allows the length of the rods to be varied with respect to that of the plunger during the liquid aspiration phase, thus synchronizing the release of the needle holder with the stroke end of the plunger. In this variant the two rods 2-c are made as a body 22 distinct from the piston, here referred to as 23. The latter has on its upper support plane a slot dimensionally corresponding to the head of 22; this slot also corresponds, on the lower side of the support surface, to the sleeve 23-b intended for the axial containment of 22 which will be inserted therein during the assembly and packaging phase of the invention. Two elastic tongues protrude from this rigid sleeve, presenting, at the free end, two tracks having a horizontal axis, ie parallel to the supporting plane. The pre-assembled invention. will feel the plunger inserted in the body 1 until the end of the gasket 2-b coincides with the bottom of the cavity 1-a while the body 22 will be inserted through the sleeve 23-b remaining with its head exactly coplanar with the plane of support of 23. In the event of sudden overturning of the syringe, the body 22 will be retained within its housing thanks to the slight pressure exerted by the teeth 22-a on the walls of the tabs 23-a, pressure determined by the inflection induced during assembly to the fins bearing 22-a and dimensionally necessary to insert 22 within 23. In the phase of aspiration of the medical liquid from a vial, the syringe will be gripped, according to current use, by the head of the plunger 23 and the plunger will slide outwards, according to its axis; during this movement the friction exerted by the male sliders 2-c on the dovetail guides 1-c will slow down the sliding of the body 22 inside 23 as this friction, even if minimal, will in any case be greater than that exerted by the teeth 22 -a on the walls of the fins 23-a, given the elasticity ensured by the slenderness of the fins themselves. This slowing down is equivalent to a movement along the same axis of advancement of the piston, but in the opposite direction; a modest displacement of 22 according to this direction is sufficient to make the teeth 22-a snap into the guides 23, thus reaching the position 24 visible in Fig. 4 of table 4, and eliminating the deflection of the supporting tabs 22-a I bodies 22 and 23 thus become integral with each other, furthermore determining a modest elongation of the rods with sliders 2-c with respect to their initial position, an elongation sufficient to ensure that the spreading of the wings 1-i, and therefore the consequent release of the needle holder, occurs only when the piston reaches the end of the stroke, that is, when the tank 1-a is completely empty. During the injection phase, the position 24 will be maintained by the shape of the guides 23-a which prevent the release of the teeth 22-a.

A further different dimensioning of the length of the rods of 22 and of the fins relating to 22-a and 22-b can allow, if required, a programming of the needle return device at different heights of the plunger with respect to the bottom plane of the cylindrical cavity and therefore with pre-ordered and different quantities of residual liquid in the cylindrical tank.

Another possible variant is shown again in table 4, fig. 5, and highlights a different possibility of coupling the two surfaces 1-e and 3-d where the duct 1-f of the main body engages with that of the needle holder 3- to; in this case an O-ring, an elastic ring with a circular section, guarantees the seal between the two surfaces mentioned.

Claims (1)

R I V E N D I C A Z I O N I 1) "DISPOSABLE SYRINGE WITH CONCEALED NEEDLE WITH REDUCED NUMBER OF COMPONENTS", characterized by the fact of having a main body formed by two parallel cavities and communicating through a hole orthogonal to the axes of the two aforementioned cavities, the first of which contains one plunger with gasket for the injection of medical liquid, plunger which also has two appendages or rods parallel to the axis of the same which slide in prismatic guides in the second cavity, with an almost rectangular section, integral with the plunger up to spread apart, with its wedge terminals, a pair of elastic wings with circular crown teeth, integral with the body of the syringe, which block, before and during the injection, a needle holder with a needle for normal injections, which, holding a couple compressed of springs, once the two elastic fins have been spread apart, it is fully recalled inside by the syringe, thus making the syringe unusable after the first and only u so, however, made of translucent or transparent synthetic material like the normal syringes on the market. 2) "DISPOSABLE SYRINGE WITH CONCEALABLE NEEDLE WITH REDUCED NUMBER OF COMPONENTS", as per the previous claim, characterized by the fact of having a main body equipped with two cavities, one cylindrical and one practically prismatic, parallel and communicating with each other at the end lower through a hole orthogonal to the axes of the two cavities. 3) "DISPOSABLE SYRINGE WITH CONCEALABLE NEEDLE WITH REDUCED NUMBER OF COMPONENTS", as per the previous claim, characterized by the fact of having two cavities where the first cylindrical is intended to contain the medical liquid for injection, while the second, in section rectangular or prismatic is designed to contain the automatic needle retraction mechanism. 4) "DISPOSABLE SYRINGE WITH RETRACTABLE NEEDLE WITH REDUCED NUMBER OF COMPONENTS", as per the previous claim, characterized by the fact of having a main body with a prismatic cavity in the lower part of which, where the needle is placed, has two conical surfaces, of which the one adjacent to the cylindrical cavity has an orthogonal hole for the passage of the medical liquid. 5) "DISPOSABLE SYRINGE WITH RETRACTABLE NEEDLE WITH REDUCED NUMBER OF COMPONENTS", as per the previous claim, characterized by the fact of having a main body with a prismatic cavity whose lower part has two conical surfaces on which the holder is sealed needle. 6) "DISPOSABLE SYRINGE WITH CONCEALABLE NEEDLE WITH REDUCED NUMBER OF COMPONENTS", as per the previous claim, characterized by the fact that it has in the median part of the prismatic cavity, a pair of elastic fins and relative teeth such as to block a needle holder which, in turn, through two cylindrical heads integral with it, compresses a pair of springs inserted in the prismatic cavity, these fins will be spread apart by two vertical rods, integral with the plunger, unlocking the needle holder which will be completely recalled inside the prismatic cavity by the extension of the aforementioned springs. 7) "DISPOSABLE SYRINGE WITH CONCEALABLE NEEDLE WITH REDUCED NUMBER OF COMPONENTS", as per the preceding claim, characterized by the fact of having a pair of dovetail guides in the prismatic cavity to guide the rods and slides integral with the aforementioned plunger. 8) "DISPOSABLE SYRINGE WITH RETRACTABLE NEEDLE WITH REDUCED NUMBER OF COMPONENTS", as per the previous claim, characterized by the fact of having a pair of cylindrical guides in the prismatic cavity for containing and sliding two compression springs for the return of the door - needle and relative needle 9) "DISPOSABLE SYRINGE WITH CONCEALABLE NEEDLE WITH REDUCED NUMBER OF COMPONENTS", as per the previous claims, characterized by the fact of having a needle holder composed of the following elements: a cylindrical head which is blocked by the two aforementioned teeth, two cylinders integral with the head itself and which keep the pair of aforementioned springs compressed, a deformable central part for the correct compression of the needle holder between the two aforementioned teeth and the conical surface terminals of the prismatic cavity, two male prismatic protuberances, one of which with a hole through, which couple to the two terminal conical surfaces of the prismatic cavity and a frusto-conical end for the insertion of the injection needle. 10) "DISPOSABLE SYRINGE WITH RETRACTABLE NEEDLE WITH REDUCED NUMBER OF COMPONENTS", as per the previous claims, characterized by the fact of having two compression springs which slide in two cylindrical guides and which are kept compressed by two cylindrical heads integral with the upper part of the needle holder. 11) "DISPOSABLE SYRINGE WITH CONCEALED NEEDLE WITH REDUCED NUMBER OF COMPONENTS", as per the previous claims, characterized by the fact of having a plunger consisting of two elements both integral with a support surface on which the pressure of the thumb finger is exerted to effect a normal injection, of the two elements one is the stem with cross and final section with rubber gasket that runs in the cylindrical cavity for the injection of the medical liquid, the other element consists of two flat vertical rods with male prismatic guides or sliders that slide in the dovetail guides obtained in the side walls of the prismatic cavity; these rods have a wedge-shaped termination adapted to spread the aforementioned elastic fins. 12) "DISPOSABLE SYRINGE WITH RETRACTABLE NEEDLE WITH REDUCED NUMBER OF COMPONENTS", as per the previous claims, characterized by having a normal injection needle, whether intravenous, intramuscular or other, needle fixed to the truncated conical terminal of the aforementioned port - needle. 13) "DISPOSABLE SYRINGE WITH RETRACTABLE NEEDLE WITH REDUCED NUMBER OF COMPONENTS", as per the previous claims, characterized by the fact of possibly having a circular section gasket placed between the needle holder and the seat where it rests to allow the passage of the medical liquid from the terminal hole of the cylindrical cavity to the hole of the needle holder without leakage of medical liquid. 14) "DISPOSABLE SYRINGE WITH RETRACTABLE NEEDLE WITH REDUCED NUMBER OF COMPONENTS", as per the previous claims, characterized by the fact of possibly having a device for recovering all the aspirable volume, from the beginning, consisting of a prismatic guide with contained fins in the top of the piston, which recovers a part of the stroke of the prismatic guides with wedge, here separated, even if inserted in the aforementioned guide of the piston. 15) "DISPOSABLE SYRINGE WITH RETRACTABLE NEEDLE WITH REDUCED NUMBER OF COMPONENTS", as per the previous claims, as described in this report and as shown in the attached tables.