Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1994-01-21
1995-04-18
Rosenbaum, C. Fred
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604124, 141 25, A61M 500
Patent
active
054074371
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a closure for a medicament well.
More preclcely, the invention relates to a closure for a medicament well on a cannula, wlth a central, closing body and, If deslred, a round body and a sklrt extending substantially in parallel with the latter.
There is mainly one kind of intravenous cannulae on the market at present, vlz. a kind where a clrcular medicament well projecting normally to the liquid channel in the lntravenous cannula is closed from above by the ald of a conventional cap, whlch is commonly fastened to the sleeve of the medicament well by the ald of a more or less sturdy fastening strap.
The present cannulae with a medicament well of a conventional kind show the inherent deficiency that after administration of medicament and removal of the administrating syringe, there is always a small volume of medicament solutlon left in the well due to the counterpressure from the liquid flowing in the cannula.
This phenomenon may represent quite a health hazard, since the volume of medicament remaining in the medicament well may act as a substrate for bacteria, or the medicament may be subjected to decomposition or metamorphosis due to influence from the outside environment.
This is probably one of the reasons for the fact that this kind of intravenous cannula ls not accepted by the FDA on the American market.
Body heat may also cause undesirable changes.
Often, hours may pass between each time the medicament well is used, and this enhances the hazard of undesirable changes.
When the medicament well is used again, the medicament phase which may be modified or decomposed will be pushed into the cannula and introduced into the body, which may cause undesirable and even dangerous states.
Another aspect that should be considered in this connection is that when small volumes of medicaments are administered it may occur that not all of the medicsmerit is injected, since some of it is left in the well.
SUMMARY OF THE INVENTION
It is an object of the present invention to remedy the shortcomings of known technology and to provide a device which permits complete discharge of the well. In this manner, any hazard of administrating contaminated material to the patient is avoided, decomposition or modification of a medicament remaining in the well is avoided, and complete administration of the medicament to the patient is ensured.
This is achieved by the aid of a closure of the above mentioned kind, and this closure is characterized by a void provided in the upper end of the closure, which is defined against the outside on top by a flexible wall and is on the other side made to communicate with the outside, via s channel extending through the closure body.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is disclosed in more detail with reference to the accompanying drawings, in which:
FIG. 1 shows a medicament well with an inserted syringe for administration of a medicament;
FIG. 2 shows a conventional closure;
FIG. 3 shows a closure according to the invention in the same phase as the conventional closure according to FIG. 2; and
FIG. 4 shows a closure according to the invention immediately after the remaining resldue was squeezed out of the well.
DETAILED DESCRIPTION
In FIG. 1, the luer 8 of a syringe 7 is inserted into the medicament well 9 1 of a cannula, for administration of medicament solutlon 10.
When medicanent solution 10 is injected into the liquid path 12 inside the cannula, a flexible tubular valve 11 is urged to temporarily open, as indicated in FIG. 4. Upon completed injection the counter-pressure in liquid 12 urges valve 11 back into contact with the cannula sidewall, including about the perimeter of the juncture 15 of the well with the cannular sidewall, thereby closing of the well from the liquid path inside the cannular, at that juncture. Upon removal of syringe 10 and insertion of a closure the situation is as shown in FIG. 2 and 3, with a conventional closure, 2, 3, 13 and a closure 2, 3, 4, 5, 6, 13, according to the invention, res
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Heimreid Bent
Preiss Otto T.
Rosenbaum C. Fred
Van Over Perry E.
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