Needle arrangement

Details Needle arrangement Needle arrangement

2000-05-04

2001-03-20

Yasko, John D. (Department: 3763)

Surgery

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

Treating material introduced into or removed from body...

C604S198000, C604S263000

Reexamination Certificate

active

06203529

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to a needle arrangement for an injection device.
BACKGROUND
A needle arrangement of this kind is known from EP 0 749 758 A1, HJERTMAN et al. In it, a hollow needle that is mounted on a hollow needle holder is used. The latter is screwed onto an external thread at the proximal end of the injection device. A special apparatus which makes the hollow needle invisible to the user, so as to eliminate his or her anxiety regarding injections, is then slid over this hollow needle.
SUMMARY OF THE INVENTION
It is the object of the invention to make available a new needle arrangement for an injection device.
According to the invention, this object is achieved by providing a compressible spring surrounding the needle, and a generally cylindrical open-ended first cap which fits over the spring.
A needle arrangement of this kind is very easy to utilize, since in practice it uses nothing more than a replaceable hollow needle. Easy adjustment of the penetration depth is also achieved, since the necessary penetration depth may be different depending on the patient's constitution. In this instance, it can be adjusted easily and obviously.
Another manner of achieving the stated object is to make the spring of plastic material, and form it integrally with a hollow needle carrier.
An arrangement of this kind has only a few parts and thus can be produced very economically. It can be used by the patient in a simple, easily understandable fashion.
A further manner of achieving the stated object is to provide a second covering cap which surrounds the first cap, the needle, and the needle carrier, and is sealed closed by a peelable foil, thereby keeping the surrounded elements sterile until the user peels off the foil.
A needle arrangement of this kind can very easily be kept sterile until used. The covering cap is usable as an assembly aid, additionally facilitating use by the patient.
Each time the patient thrusts the hollow needle in prior to an injection, the displaceable cap is displaced in the distal direction against the force of the spring, and when the hollow needle is pulled out it moves back into its proximal end position under the action of the spring, so that the patient does not see the hollow needle during the entire injection procedure. Because of the detachable mounting on the injection device, a needle arrangement of this kind can very easily be replaced, after an injection, with a new, sterile needle arrangement.


REFERENCES:
patent: 2876770 (1959-03-01), White
patent: 5292314 (1994-03-01), D'Alessio et al.
patent: 5403286 (1995-04-01), Lockwood, Jr.
patent: 5429612 (1995-07-01), Berthier
patent: 5578014 (1996-11-01), Erez et al.
patent: 5658256 (1997-08-01), Shields
patent: 89 09 799 U (1989-11-01), None
patent: 691 08 928 T2 (1995-11-01), None
patent: 196 00 058 A1 (1997-07-01), None
patent: 0 182 682 (1986-05-01), None
patent: 0 405 039 A1 (1991-01-01), None
patent: 0 520 930 A1 (1992-12-01), None
patent: 0 749 758 A1 (1996-12-01), None
patent: 93 01153 (1994-08-01), None
patent: WO91-13643 (1991-09-01), None
patent: WO93-05835 (1993-04-01), None
patent: WO94-03220 (1994-02-01), None
patent: WO94-04205 (1994-03-01), None

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