Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1990-04-26
1992-05-26
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604197, 604198, 604232, A61M 550
Patent
active
051163195
DESCRIPTION:
BRIEF SUMMARY
There is an increasing demand for injection syringes the needle of which can be covered after use in order to prevent injury by a used needle. On or in a needle which has been used for an injection there may be blood residues which, if another person pricks himself with the needle, may lead to infection with serious diseases, more particularly as yet incurable and even deadly diseases.
Replacing the sleeve used for packaging a needle after use is not a satisfactory solution, since injury may occur particularly in the course of fitting such a narrow sleeve especially if the needle is stuck outside the opening. Used needles by themselves or as part of an injection fluid container unit or an entire syringe are generally thrown away. Care needs to be taken that the needles stay protected at all times, and thus also during processing rod domestic waste. In addition, it is often necessary to prevent re-use of used disposable syringes by professional users as well as drug addicts.
Various solutions to this problem have already been proposed, such as sheaths which are slidable along the syringe, but these do not provide absolute security, because of, i.e., an insufficiently secure locking or fragility of the sheaths. In other solutions, the inside end of the needle, which connects the needle to the cylinder of the syringe, is connected to the plunger syringe after use so as to be retractable into the cylinder of the syringe after use. To this end, the inside end of the needle is first connected internally to the cylinder, for instance by means of a snap lock. However, connecting the plunger to the inside end of the needle, and sometimes also providing for disengagement the inside end of the needle from the bottom of the cylinder, requires rotating and sliding movements in a certain order, which complicates the operation of the device. It is, however desirable to provide the advantage of rendering the needle harmless by a manual movement which is as simple as possible. According to yet another published proposal, the inside end of the needle is connected to the cylinder by a line of weakness (weakened section or tear line), which, subsequent to the coupling of the inside end to the plunger by means of a snap lock, must be broken in order to retract the needle into the cylinder. It is difficult to produce such a line of weakness in a properly reproducible and reliable way, and besides, it is possible to move the needle outwards exposing it again.
The invention provides a syringe which does not have the said disadvantages. The syringe according to the invention comprises an elongate casing having a first end and a second end and an interior surface which defines a chamber for receiving a cartridge; the first end having an opening adapted for slidable engagement with a plunger movable within said chamber including means for preventing removal of said plunger from said chamber and said second end being adapted for engagement with a needle cap; the plunger comprising an actuator handle having a rod and a needle foot engagement means extending therefrom; and a blocking means for preventing a cartridge disposed within said chamber from passing through said opening until said plunger has been passed through said opening into said chamber.
The invention will now be elucidated in greater detail with reference to the accompanying drawing, showing:
FIG. 1 shows a first embodiment of a safety syringe according to the invention in longitudinal section;
FIG. 2 shows a modification of the syringe of FIG. 1;
FIGS. 3A and 3B show a section corresponding to FIG. 1 and an end view, respectively, of a modified embodiment;
FIGS. 4A and 4B show a modification of the embodiment of FIG. 3 in two different conditions;
FIGS. 5A and 5B show sections through another embodiment of the safety syringe;
FIG. 6 shows a modification of the syringe of FIG. 5;
FIGS. 7A and 7B show sections through yet another embodiment of the safety syringe, and a view of a part thereof, respectively;
FIGS. 8A and 8D show a modification of the syringe of FIG. 7 in di
REFERENCES:
patent: 4664653 (1987-05-01), Sagstetter et al.
patent: 4710170 (1987-12-01), Haber et al.
patent: 4747829 (1988-05-01), Jacob et al.
patent: 4799927 (1989-01-01), Davis et al.
patent: 4826484 (1989-05-01), Haber et al.
patent: 4838869 (1989-06-01), Allard
patent: 4898589 (1990-02-01), Dolgin et al.
patent: 4935014 (1990-06-01), Haber
patent: 4944723 (1990-07-01), Haber et al.
patent: 4950251 (1990-08-01), Haining
patent: 4957490 (1990-09-01), Byrne et al.
patent: 4986813 (1991-01-01), Blake, III et al.
Advanced Protective Injection Systems B.V.
Cermak Adam J.
Yasko John D.
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