Needle protection device

Details Needle protection device Needle protection device

1993-10-08

1995-09-05

Rosenbaum, C. Fred

Surgery

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

Treating material introduced into or removed from body...

604110, 604263, 128763, A61M 532

Patent

active

054475015

DESCRIPTION:

BRIEF SUMMARY
The present invention generally relates to a device for use in infusion cannulas, and more specifically to a device for protecting a needle or the tip of a needle used in such contexts.
The existence of contagious or infectious diseases, such as AIDS and hepatitis B, which via the blood, other body fluids or tissue parts can infect the nursing staff, makes the treatment/care of patients extremely hazardous, since each patient must be regarded as a potential infection source.
Since the discovery of HIV, many people in the health service, ambulance personnel, nurses, doctors and others have been infected, e.g. by body contact with or accidental pricking by infected needles which have been used in the treatment of blood-infected patients.
To protect the nursing staff who is directly involved in the care of such highly infectious patients, extensive efforts have been used for developing syringes and infusion cannulas, as well as protection devices for use in such syringes and infusion cannulas, with a view to preventing direct contact with infected needles and safeguarding against accidental needle pricking.
One example of such a device is disclosed in U.S. Pat. No. 4,725,267, in which a spring-biased needle tip protection means is moved forwards over the needle tip after the needle has been used. The spring actuating the protection device may be integrated with a flexible tube which prevents direct contact with the end of the needle remote from the needle tip.
Another example of a protection device of the above-mentioned type is disclosed in DE-A1-38 08 688. A needle tip protection means connected to a flexible tube is moved forwards over the needle after this has been used, and is so angled as to bring the needle tip into a clamped position inside the protection device. The flexible tube is then pulled over the end portion of the needle remote from the needle tip.
Further, protection devices are known in the art which have no flexible tube, but yet cover, that is surround, the entire needle. One example of such a device is illustrated in U.S. Pat. No. 4,850,994, in which a rigid sleeve-shaped member, which is movable in the longitudinal direction of the needle, is moved, after the needle has been used, over the needle, which then is completely surrounded by the sleeve-shaped member in spaced-apart relationship thereto.
U.S. Pat. No. 4,955,866 discloses a needle tip protection means which is in the form of a cylindrical part surrounding the needle. The cylindrical part is fixed, e.g. by a thread, to the end of the needle remote from the needle tip. This part may be formed with a chamber provided with a washer having a hole through which the needle passes in the position of use. After the needle has been used, the cylindrical part is manually moved over the needle tip, the needle being retracted from the hole in the washer which thus descends, obstructing the passage in the cylindrical part.
Further, it is known from WO90/08564 to replace the washer traversed by the needle, with a gravity-actuated ball provided in a chamber and serving to prevent exposure of the needle after use.
In addition to sleeve-shaped members which are applied in some suitable manner over the needle tip for protecting it after the needle has been used, it is also known to act on the end of the needle remote from the needle tip, i.e. the mounting end of the needle, such that the needle is made, after use, to form an angle with the axis of the sleeve-shaped member. Examples of this type of approach are given in U.S. Pat. No. 4,770,655, where the needle is also deformed, and in U.S. Pat. No. 4,83,863, U.S. Pat. No. 4,908,022, U.S. Pat. No. 4,932,939, U.S. Pat. No. 4,978,343, and U.S. Pat. No. 4,986,813.
Present-day techniques thus offer a large number of more or less complex solutions for protecting nursing staff and others from used, sometimes contaminated needles. However, since all the known solutions suffer from more or less serious drawbacks, further technical development in this field is indeed called for. Above all, it is the risk o

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