Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1990-01-11
1991-11-12
Rosenbaum, C. Fred
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604198, 604218, 604110, 128919, A61M 500
Patent
active
050644190
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a disposable hypodermic syringe of the kind presented.
Today disposable syringes are widely used in hospitals and nursing homes as well as in clinics, dental clinics etc. in order to prevent transmission of infection. Health authorities also strongly advise that drug addicts and the like use disposable syringes because the danger of infection is considered to be extremely large among this group of people. The use of disposable syringes also causes great problems in connection with safe disposal of the large number of used disposable syringes, because disposal and destruction must take place in such a manner that other persons are not exposed to any danger of infection when touching the needles of the disposable syringes.
Disposable syringes should therefore be designed so that they, apart from being used only once, are designed so that the needle after use can be retracted and held inside the syringe.
Such a disposable syringe is known from U.S. Pat. No. 4,650,468 where the needle, following the emptying of the syringe, can be retracted into the syringe barrel and held there. The needle is attached to a piston head which in its position for use is released from the piston and connected with the frontmost end of the syringe barrel. When the piston is pressed down and the syringe is empty, the user will, by twisting the piston rod while the needle protrudes from the syringe, have to release the piston head with the needle from the syringe barrel and then retract the piston rod with the piston head back to an end position in which the piston rod will automatically be locked to the syringe barrel. If the retraction is not effective, the needle can again be moved out of the syringe. Consequently, the design can work according to purpose, but it does in fact comprise at least fifteen single parts which means that the production and assembly costs of the syringe become considerable which is a disadvantage, particularly in connection with a syringe for single use.
The object of the invention is to provide a disposable hypodermic syringe where the retraction of the needle is quick and reliable so that the needle is immediately hidden and the syringe cannot be used again.
This is obtained by designing the disposable syringe according to the invention as presented. Once the piston has reached the bottom, the user will, merely by applying a short further pressure on the piston rod in the same direction as when emptying the syringe, make the needle snap all the way back into the syringe. Consequently, no particularly directions are required as to how to render the syringe harmless since this is done the minute the syringe is emptied completely.
By designing the hypodermic syringe according to the invention as presented in the specification and claims, the piston will become locked in its bottom position so that it cannot be retracted if for instance somebody tries to use the syringe again. This is a double safeguard against repeated use, and even during attempts at using the syringe again, the needle will remain inside the syringe barrel so that no danger of infection occurs.
The hypodermic syringe according to the invention can be designed as presented in the claims and specification in that the piston with piston rod and the forwardly pointed cone with projections can be designed as a unit by injection moulding in order that the embodiment does not require further individual parts. Besides, the hypodermic syringe according to the invention only comprises a specific number of individual parts.
By designing the hypodermic syringe according to the invention as presented in the claims and specification, the spring effect is obtained in a simple, reliable and very inexpensive manner since ordinary helical springs are standard equipment which are available in large quantities at very low prices.
By designing the hypodermic syringe according to the invention as presented in the claims and specifications, an embodiment is obtained where the cavity in the piston is shut off from the liquid chamber pro
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Polutta Mark O.
Rosenbaum C. Fred
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