Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1993-04-19
1996-11-12
McDermott, Corrine M.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604110, 604198, A61M 500
Patent
active
055735126
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an infusion or transfusion needle assembly, at least comprising a hollow needle fixed in a needle holder, which needle holder is or can be connected to a connecting hose.
Such a needle assembly or cannula is known from, for example, DE-U-88 12 099. This publication describes a cannula for vessel puncture, in particular for blood treatment outside the body, for example dialysis or plasmaphoresis. In order to ensure that the needle is sterile, the needle is situated in a protective cap which is removed before use. After use of the cannula, the needle can be inserted into the protective cap at the other side, and is pushed through a membrane, this being in order to prevent injury from the needle. Since a patient on whom the cannula is used could have other, possibly transmittable diseases apart from the condition treated with the cannula, injury from a used needle could have extremely serious consequences.
The major disadvantage of this cannula is that, despite the use of the protective cap as a needle protection after use, there is still a risk of injury. It is in fact always necessary to exert some force in order to pierce the membrane, in the course of which the needle could shoot out. The needle could also miss the cap and accidentally be pushed into the hand holding the cap. The cap can also easily be lost, due to the fact that most treatments with a cannula last a relatively long time (a dialysis treatment generally takes about six hours). This means that the cannula will then be thrown away with an unprotected needle, thus producing the risk of injury.
Finally, the cannula according to the publication also has the disadvantage that the wound formed by the needle is often damaged during removal of the cannula, due to the fact that the plaster or other fixing means by which the cannula is fixed to the skin has to be removed first of all before the needle can be removed from the skin. The removal of the plaster results in the needle being pulled slightly askew in the blood vessel. This pulling askew can also be painful for a patient in whom the cannula is inserted.
The object of the present invention is to eliminate the above-mentioned disadvantages, and to this end the invention is characterised in that the needle holder is slidable accommodated in a sheath, and in that locking means are present between the needle holder and the sheath, said locking means being designed in such a way that after unlocking of the needle holder the needle can be pushed fully into the sheath and locked therein.
This makes it possible to draw the needle into the sheath after use of the assembly, something which can be performed with one hand or with both hands. It is important here that the forces used for displacement of the needle are always directed in the longitudinal direction of the needle, but never towards the pointed end thereof, which minimises the risk of the needle shooting out and thereby causing injuries.
The problem of the needle being pulled askew in the blood vessel during removal of the assembly is also eliminated, through the fact that the needle is pulled out of the blood vessel into the sheath before the plaster is removed. A cotton wool plug or something similar is generally held on the wound with one hand during this operation. The needle can then be pulled back into the sheath with the other hand, and the plaster can be removed without any adverse or painful effects for the wound which has been formed by the needle. After these operations the needle is pushed into the sheath and locked, and any risk of injury afterwards is virtually ruled out. Moreover, the assembly cannot be re-used, and can be thrown away without the need for fitting a protective cap or the like.
Advantageous embodiments of the infusion needle assembly according to the invention are described in the sub-claims.
The invention will be explained in greater detail below with reference to the appended drawing; in which:
FIG. 1 shows an infusion needle assembly according to the invention;
FIG. 2 shows the i
REFERENCES:
patent: 4160450 (1979-07-01), Doherty
patent: 4804372 (1989-02-01), Laico et al.
patent: 4894055 (1990-01-01), Sudnak
patent: 4917669 (1990-04-01), Bonaldo
patent: 4935012 (1990-06-01), Magre et al.
patent: 4985021 (1991-01-01), Straw et al.
patent: 4998924 (1991-03-01), Ranford
patent: 5070884 (1991-12-01), Columbus et al.
patent: 5088982 (1992-02-01), Ryan
Advanced Protective Injection Systems B.V.
McDermott Corrine M.
LandOfFree
Infusion or transfusion needle assembly does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Infusion or transfusion needle assembly, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Infusion or transfusion needle assembly will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-558959