Infusion set for an intermittent or continuous administration of

Details Infusion set for an intermittent or continuous administration of Infusion set for an intermittent or continuous administration of

1995-09-05

1996-06-04

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604174, 604 93, 6048901, A61M 532

Patent

active

055228038

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The invention relates to an infusion set for an intermittent or continuous administration of a therapeutical substance, such as insulin, said infusion set comprising a cannula housing with a soft plastic cannula to be placed inside the body of a patient, where the cannula together with the cannula housing form a through passageway the inlet of which into the cannula housing is covered by a membrane, and where said infusion set comprises a needle hub with a needle to be inserted in the through passageway of the cannula housing through the membrane, and furthermore guide means for centering the needle relative to the membrane and the through passageway, as well as locking means for releasably interlocking the cannula housing and the needle hub.


BACKGROUND ART

EP-PS No. 256,694 discloses an infusion set of the above type. This infusion set comprises a cannula housing, in which the membrane is placed relatively far down in the through passageway in the cannula housing, a passageway between the membrane and the end facing away from the cannula forming a guide for the needles to be inserted through said membrane. The entire infusion set is shaped in a substantially rotationally symmetrical manner about the longitudinal central axis of the through passageway.
WO 88/03816 discloses an infusion set with a membrane secured at the inlet to the through passageway through the cannula housing. The membrane is retained between a beaded or melted down portion of the material of the cannula housing and a bushing arranged immediately inside the membrane and forming a conical inlet to the continued portion of the through passageway to the cannula. This infusion set is also shaped in a substantially rotationally symmetrical manner about the longitudinal central axis of the through passageway.


BRIEF DESCRIPTION OF THE INVENTION

The object of the invention is to provide an infusion set being relatively easy to handle and easy to secure to the skin of the patient in question.
The infusion set of the above type is according to the invention characterised in that in the assembled state the cannula housing and the needle hub present a substantially planar rear side and a relatively large width in a direction parallel thereto and substantially perpendicular to the longitudinal central axis of the through passageway, that the guide means are co-operating guide pins and guide openings on each side of the needle and the through passageway, and that the locking means are resilient locking pins arranged on their respective side of the needle on the needle hub and comprising barbs, said locking pins with barbs being adapted to be received in their respective recess in the cannula housing, where said recesses comprise shoulders mating said barbs.
This infusion set is relatively easy to secure in a reliable manner to the skin of the patient, said set being arranged with the planar side abutting said skin. In addition, it is relatively easy to handle because the guide means ensure an easy alignment and centering of the needle of the needle hub relative to the membrane of the cannula housing before said membrane is penetrated. Finally, the resilient locking pins ensure a relatively easy snap-engagement and interlocking of the cannula housing and the needle hub, and this engagement is easily releasable again due to the resilience of the locking pins. An easy access to the membrane of the reliably retained cannula housing is possible by a removal of the needle hub so as to allow an insertion of the needle on a syringe, if any, to be used shortly for administration of a therapeutical substance. A coupling through a hose of the needle hub to a pump, such as an insulin pump, renders it possible to easily connect said pump with the cannula housing through the needle hub.
According to the invention, the cannula housing and the needle hub may in the assembled state be of a substantially circular shape with a substantially uniform thickness, the cannula housing being formed integral with a projecting platform substantially cover

REFERENCES:
patent: 4352354 (1982-10-01), Ujihara
patent: 4362156 (1982-12-01), Feller, Jr. et al.
patent: 4863432 (1989-09-01), Kvalo
patent: 5186712 (1993-02-01), Kelso et al.
patent: 5267967 (1993-12-01), Schneider

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