JPS5835259Y2 - Used syringe - Google Patents

Description

[Detailed description of the invention] The present invention not only completely solves the problem of preventing contamination that occurs when disposable syringes are reused by users, which is a problem of worldwide concern, but also This was done to solve the unresolved problem of syringe reuse by drug patients.

The improvement according to the invention is to make the use of the syringe more effective and easier and to prevent its reuse, as well as to prevent the reuse of the needle.

Since the above-mentioned syringe uses a normal injection needle, the injection needle can be reused.

Therefore, one aspect of the present invention is to prevent reuse of injection needles.

U.S. Pat. No. 3,667,657 shows a prefilled syringe in which a non-retractable knife destroys the syringe during use.

Some injectable solutions cannot be stored for a given period of time in containers made of materials such as plastic that can be cut with a blade.

There is therefore a need for a syringe for injection solutions of the above type that can be filled without cutting the cylinder with a blade when extracting the solution from its container during the filling process of the syringe.

Mexican Patent No. 107,080 shows a structure in which a resiliently mounted knife is attached to one side of the flap of the piston rod.

In most of these syringes, a small portion of the syringe corresponding to the size of the plunger piston is not cut off, allowing the drug patient to refill the broken syringe with a small amount of solution.

The invention further includes solving this and other problems.

According to the invention, the invention comprises a rigid cylinder having an open other end connected at one end to a bottom wall having an opening for the outlet of the solution to be injected, said end extending outward relative to the axis of the cylinder. a plunger integrally connected to a support flange extending perpendicularly to the cylinder, and further having a piston connected at its extreme end to the cylinder, the piston extending parallel to the longitudinal axis of the cylinder and said A non-reusable disposable syringe is provided having at least one punched rim that engages or penetrates the bottom wall of the cylinder to prevent reuse.

One embodiment of this aspect of the invention is to have a needle or pin in the front of the piston that corresponds to a weak spot or groove made in the front of the cylinder without completely penetrating its wall, in which case When the solution is injected by the user and the piston reaches the end of its travel, the cylinder is completely punctured at the weak point to prevent reuse of the syringe.

Of course, this type of disruption can be used in conjunction with a cutting blade as described for the type of syringe described above.

Another embodiment that solves the problem described above has a rib and toothed protrusion or other type of mechanism in the center of the front end of the piston that is aligned with the rib and toothed protrusion or other type of feature that jams when inserted into the needle during the first use of the solution. The plunger gets stuck in the ribbed part of the needle, blocking the plunger and making it impossible to reuse it.

This embodiment can be combined with a cutting blade as in the previous embodiment and has a stop near the extreme end of the cylinder of the syringe container to prevent breaking the syringe during assembly before first use. However, in this way the pin and closure mechanism prevents the syringe from becoming inoperable prematurely.

The improved syringe that is the subject of the present invention is shown in Figures 1 to 3.
A cylinder 2 constructed according to the embodiment shown in the figures and made of a material such as plastic, which can be cut with a knife.
0, and this cylinder has a pivot 2 at one of its extreme ends.
1 and at its other extreme end a pair of flanges 22 projecting generally in opposite directions at right angles from the longitudinal axis and serving as supports for the user.

The cylinder 20 has a narrow groove or longitudinally weak portion 23 on the inside of the cylinder 20 over almost the entire length of the cylinder, and although this portion 23 does not constitute an essential part of the present invention, FIG. Shows the appearance of the syringe.

The plunger of the syringe actually has a cruciform flap.

The plunger has a piston having a disk portion at its extreme end and an annular sealing boss portion at its other extreme end.

Said cylinder has on its inner surface a projection which can be formed by simple pressure applied by a hot punch to its outer wall to form the desired ledge which acts as a stop against one of the annular sealing bosses. This restricts the rearward movement of the plunger or piston and at the same time acts as a guide for the hanging piece to prevent the plunger from rotating.

FIG. 2 shows an embodiment applicable to syringe containers of the type described above, prefilled syringes and empty syringes, for example in which a needle 57 is embedded in the material from which the cylinder is made.

The piston 27 has at its front a punching member 67, which is parallel to the longitudinal axis of the syringe and is in line with a hole 68 made in the front outside of the syringe 20 and weakening its wall. , so that when the piston 27 completes its travel during its injection operation, the punching member 67 penetrates entirely through the front part of the cylinder, which is already weakened by the hole 68;
As a result, the syringe cannot be refilled in any way.

This method of breaking the syringe can be combined with a cutting blade that cuts the cylinder when using this type of empty syringe, as shown by the dotted line 23 indicating the groove made on the outside of the cylinder 20; The cylinder has a forward stop 69 to indicate how far the syringe assembler can push the piston 27 through the hole 68 without punching the cylinder with the punch 69.

This creates an initial vacuum when filling the syringe with injection solution, and that vacuum should be removed from the syringe before the user begins the injection process.

An embodiment very similar to the embodiment described above is shown in FIG. 3, in which a ribbed and bladed pin rod 70 is provided in the front center of the piston 27 in place of the punched member 69. The pin bar jams against the rib or blade 71 as it enters the needle 57, preventing withdrawal of the plunger from the syringe.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the overall appearance of an example of a disposable syringe to which the present invention 1 is applied, and FIG. 2 is a broken side sectional view of an example of the disposable syringe according to the present invention. FIG. 3 is a cutaway side sectional view of another embodiment of the disposable syringe of the present invention. 20... Cylinder, 27... Piston, 57... Syringe needle, 67... Push-out member, 68... Hole, 69... ...Stopper 70...Pin rod.

Claims (1)

[Scope of utility model registration request] A non-reusable, disposable syringe having a rigid cylinder having an open other end connected at one end to a bottom wall having an opening that is an outlet for the solution to be injected, the other end being an open end of the cylinder. a plunger integrally coupled to a support flange extending outwardly at right angles to the axis and further having a piston at its most end coupled to the cylinder, said piston extending parallel to the longitudinal axis of the cylinder; and having at least one punch-out flange that engages or perforates the bottom wall of the cylinder to prevent reuse.