Multiple sample needle assembly with vein indicator

Details Multiple sample needle assembly with vein indicator Multiple sample needle assembly with vein indicator

1983-12-16

1989-12-12

Hindenburg, Max

Surgery

Truss

Pad

128765, 128766, A61B 514

Patent

active

048860727

ABSTRACT:
A multiple liquid sample needle assembly is provided. The assembly includes a housing with a sample receiving chamber having translucent or transparent walls for determining whether access to the sample source in question has been obtained. The invention utilizes a highly absorbent material in a form which allows venting of gases displaced from the housing chamber by the liquid sample being obtained, which material expands upon contact with the liquid sample to provide a liquid impervious barrier. The improvement in this invention is the absorbent material in a separate sleeve-like form which may be a laminate or a compacted tablet sleeve of the absorbent material for rapid and easy insertion between the two hub parts forming the assembly housing. The arrangement herein is particularly appropriate for mass production techniques in that two housing parts may have inserted therein the tablet sleeve of the invention, rather than as in previous approaches where an absorbent material similar to that utilized herein in a sleeve or tablet like form was introduced in a loose non-precise powder form for a relatively imperfect seal between two housing parts. The invention herein contemplates sonic welding, gluing, or snap fitting of the housing parts together in a further production line procedure.

REFERENCES:
patent: 3985616 (1976-10-01), Weaver et al.
patent: 4207870 (1980-06-01), Eldridge
patent: 4340067 (1982-07-01), Rattenborg
patent: 4416291 (1983-11-01), Kaufman
patent: 4519402 (1985-05-01), Andersen

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