SELF LOCK WITH NON REDRAW SYRINGE
BACKGROUND OF THE INVENTION
FIELD OF INVENTION
Our invention associated with non-returnable syringe which can be used only one time then they said syringe, is secured by using hemisphere-rectangular locking (Fig 8) mechanism for medication as shown in (Fig 8).
BACKGROUND OF THE INVENTION
Everywhere in the world re-usable syringe, are frequently used in medical applications. A vein drug with a use again syringe, leads to high risk of epidemic diseases. The solution for these issues, we developed a hemisphere-rectangular locking (Fig 8) mechanism to prove the single usage of the syringe, therefore it avoids the spreading of contagious diseases.
The perfect syringe would integrate Rectangular groove (Fig l.b) and hemisphere-rectangular bush locking (Fig 8) mechanism in Fig 8. It allows the typical use of the syringe. The design (Fig 6) should be reasonable and authentic. Finally, the design (Fig 6) is complete destruction of use-again and worth medication.
US 3951146
This invention refers to disposable syringe containers used for injection which destroy themselves and render themselves un-reusable, characterized principally in that they are made of a material which can be cut with the normal injecting movement of the piston in the syringe, thus destroying them.
US 5026346
A syringe comprising a barrel with means for positioning a needle at a forward end thereof, a plunger displaceable within the barrel, sealing means to maintain the integrity of a

dispensing chamber forwardly of the barrel, wherein the plunger has associated disabling means to render the sealing means ineffective after a first use of the syringe.
US 5215536
A syringe for injecting medicinal fluids into a patient or aspirating fluids or tissue from a patient, where in the syringe incorporates a self-locking mechanism on the plunger thus preventing the plunger from being withdrawn back into the barrel by the action of a vacuum in the syringe barrel. The self-locking mechanism is independent of the relative rotational relationship of the plunger with respect to the barrel. Unlocking may be effected by simply squeezing the self-locking mechanism on the plunger, no rotational force being necessary.
SUMMARY OF THE INVENTION
The present invention related to non -returnable syringe comprising of Rectangular groove (Fig l.b) on the inner periphery of the outer barrel (Fig 1) and the push rod (Fig 3) meshed with plunger (Fig 2) kept inside the barrel, at the deliver end, which shows the plunger (Fig 2) is facing towards the patient .When medicated, the plunger (Fig 2), moves towards the Suction end (Fig l.c) of the barrel, which shows the plunger (Fig 2) is facing away from the patient. A step is provided at the inner periphery of the barrel which positively locks the plunger (Fig 2) and avoids the removal of plunger (Fig 2) from the barrel.
Then, the plunger (Fig 2) is depressed with the help of push rod (Fig 3) once it reaches the deliver end , the bushes moves outwards from the plunger (Fig 2) Holes (Fig 2.b) and thereby gets locked in the barrel groove. Meanwhile there comes another simple locking . mechanism which locks the push rod (Fig 3) inside the plunger (Fig 2).

Once locked, the surface of the push rod (Fig 3) and the plunger (Fig 2) flange will coincide. The invention will be further understood of the features and the advantages of the inventions in detail descriptions as illustrated in the following drawings.
BRIEF DESCRIPTION OF THE DRAWING
Fig: 1 - This represents the outer barrel of the syringe which is used to suck the drug and it's
the place where the plunger moves to and fro.
Fig: 2 - Plunger, helps in injection of drug and to move the push rod.
Fig: 3 - Push Rod, help in releasing drug and helps to lock the syringe.
Fig: 4 - Bush, it helps to arrest the plunger motion after drug delivery.
Fig: 5 - Rubber, which ensures complete vacuum inside the outer barrel.
Fig: 6 - Before suction assembly
Fig: 7 - After suction assembly
Fig: 8 - Delivery (Syringe locking) assembly

DETAILED DESCRIPTION THE DISCLOSED EMBODIMENT
> The objective of the invention is to provide a used once (non-returnable) syringe, mesh a locking mechanism to preventing re-use.
> The invention is to provide a simple and reasonable syringe for numerous people in medical profession which can't be used, once it injected.
> Additional objective of the invention to provide a non -returnable syringe that performs similar like conventional disposable syringe and capable of using hypodermic needle.
> In compliance with present innovation, the inner boundary of outer barrel (Fig 1) is unsegregated with Rectangular groove (Fig l.b) near the deliver end for positive locking and a step is provided at the inner periphery of the barrel which positively locks the plunger (Fig 2) and avoids the removal of plunger (Fig 2) from the barrel.
> The plunger (Fig 2) is associated with push rod (Fig 3) and the bushes were placed coaxially to plunger (Fig 2) Holes (Fig 2.b). The bushes and the plunger (Fig 2) Holes (Fig 2.b) are in transition fit.
> The medication is sucked by the plunger (Fig 2) and depression of the medication takes place by pushing of the plunger (Fig 2) along with push rod (Fig 3).
Simultaneous motion of parts
1. Push rod (Fig 3) and plunger (Fig 2) moves coaxially to the outer barrel (Fig 1) towards the discharge end.
2. The push rod's (Fig 3) frustum gradually hits the bushes which move normally with respect to plunger (Fig 2).
3. At end of the delivery stroke, the plunger's (Fig 2) Holes (Fig 2.b), outer barrel (Fig 1) groove and hemispherical rectangular bushes were coaxial
4. Finally the Rectangular portion (Fig 4.a) of the bush will be locked inside the outer barrel (Fig 1) groove and leaves the hemispherical portions in the plunger (Fig 2) Holes (Fig 2.b).
5. Simultaneously the push rod (Fig 3) head is locked with plunger (Fig 2) head by means of their projections.
Here in this concept we introduced a simple and effective mechanism which prevents the syringe to be re-used.

CLAIM
WE CLAIM
1. Non-returnable syringe fig: 8 comprising a barrel have bushes near the Delivery end (Fig l.a) to lock the plunger (Fig 2). Plunger (Fig 2) consists of push rod (Fig 3) in cylindrical shape fig 3. Plunger (Fig 2) configured to move between the "Delivery ends" (Fig l:a) and "Suction end" (Fig 1 .c) with respect to the barrel Rubber plug fig 7. While reaching the Delivery end (Fig l.a), the push rod (Fig 3) forces the bushes whereby it gets locked in the Rectangular groove (Fig 1 .b) through the plunger (Fig 2) Holes (Fig 2.b).fig 8.
1. The cover of claim 1, wherein the inner periphery of the barrel consists of Rectangular groove (Fig 1 .b) fig 1.
2. The cover of claim 1, wherein the bushes were kept inside the plunger (Fig 2) initially fig 6.
3. The cover of claim 1, wherein pressure applied on the push rod (Fig 3) (by thumb finger) forces the bushes to lock in the groove fig 8.
4. The cover of claim 2, meanwhile, the pushrod inside the plunger (Fig 2) gets locked fig 8.
5. The cover of claim 2, the surface of the push rod (Fig 3) and the plunger (Fig 2) coincide fig 8.