Needle catheter with safety device

Details Needle catheter with safety device Needle catheter with safety device

1994-04-29

1996-07-02

Maglione, Corrine M.

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604 51, 604158, 604162, 604164, 604171, A61M 500

Patent

active

055317138

DESCRIPTION:

BRIEF SUMMARY
This invention relates to a needle catheter to be placed in the lumen of a blood vessel, for example for the administration of anaesthetics drugs or drips or for similar uses and equipped with a safety device, in particular against possible injury to the user or to other personnel.
A needle catheter consists of a needle-guide or metallic mandrel enclosed in a catheter made of plastic material. In practice, the whole is inserted in the blood vessel like a normal needle and then the metallic needle-guide is extracted, to allow, for example, a drip to be connected to the catheter for administration to the patient.
This type of needle catheter is superseding ordinary metallic needles because of its indisputable advantages among which are: ease of endovasal positioning, greater freedom of movement for the patient who can move his limbs without danger of damaging the blood vessel and longer lasting patency.
However, two major disadvantages must be added to these qualities and these represent a potential danger of transmission of infective pathology.
These disadvantages are connected with the extraction of the needle-guide or metallic mandrel for the connection of the catheter to a drip or other device and the consequent bleeding.
While it is possible to protect oneself from the blood flow by using gloves for example and thereby considerably reducing the risk of contagion, this is not possible, either during the extraction of the metallic needle or later on, so that it is easy to be pricked and possibly infect oneself because surgical gloves are by no means imperforable.
The object of the invention is to eliminate these disadvantages, and in particular the risk of injury to the user or other personnel with the metallic needle-guide.
This objective is achieved, by the means of the invention, in providing an extending cover element, joining the end grip of the needle-guide to the casing of the catheter, in such a way as to cover the needle when this is withdrawn from the catheter, means of blocking being provided to fix the metallic needle in the withdrawn position as well as a means of interception to prevent the outflow of blood.
This extensible cover, best takes the form of telescopic sections or of an elastic element such as a bellows.
A flexible lateral branch for joining to a drip or other item can be fixed to the catheter at a point above the means of interception.
This means of interception and possibly of blocking can take the form of an adjustable vane in appropriate guides set in the body of the catheter, in such a way as to create a barrier in the lumen of the catheter when it is lowered.
Alternatively a ball can be set in an appropriate space in the casing of the catheter and which is forced into the lumen thus occluding it.
Again, a tap can be provided, consisting of a ball valve or other equivalent means, actioned by an external lever.
The needle once extracted can remain in situ, inside the extensible element which remains attached to the catheter. It is however better to completely remove the needle-guide together with the extensible covering element.
Further features of the invention will be clarified by the detailed description which follows and which is simply an example and therefore not limitative in its application. It is illustrated by the enclosed drawings of which:
FIG. 1 represents a lateral schematic view, partly in section, of a needle catheter complete with the safety device according to the invention, in its first form of construction, before retraction of the metallic needle-guide.
FIG. 2 is the same view as FIG. 1 but with the needle-guide retracted.
FIGS. 3A and 3B are enlarged schematic sections at the point of the adjustable vane which is shown in the open and closed positions respectively.
FIGS. 4 and 5 show similar views to FIGS. 1 and 2 and illustrate a second form of construction for the invention.
FIGS. 6 and 7 again show similar views to FIGS. 1 and 2 and illustrate a third form of construction for the invention.
FIGS. 8 and 9 show yet again similar views to FIGS. 1 and 2 a

REFERENCES:
patent: 4160450 (1979-07-01), Doherty
patent: 4245635 (1981-01-01), Kontos
patent: 4755170 (1988-07-01), Golden
patent: 4944728 (1990-07-01), Carrell et al.
patent: 5015240 (1991-05-01), Soproni et al.
patent: 5051109 (1991-09-01), Simon
patent: 5064083 (1991-11-01), Alexander et al.

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