Pre-slit injection site and tapered cannula

Details Pre-slit injection site and tapered cannula Pre-slit injection site and tapered cannula

1989-04-10

1992-08-04

Hafer, Robert A.

Surgery

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

Treating material introduced into or removed from body...

604905, 604201, 128765, A61M 500

Patent

active

051354896

ABSTRACT:
A pre-slit injection site (34) includes a housing (40) with a flow path therethrough. A first end (42) of the housing (40) carries a pre-slit septum (52). One form of a blunt cannula (98), usable with the injection site (34), carries a locking member (100). When the pre-slit injection site (34) slidably receives the blunt cannula (98), the locking member (100) latches to the injection site (34) and creates a mechanically coupled unit. Another form of the cannula (280) includes a tube having a tapered distal end region (298) and having elongate discharge slots (294) for reducing contact surface area and for directing the flow laterally out of the cannula. The cannula may also include a rounded lead post (330), an annular barb (394), and axially oriented grooves (268). A blood sampling system utilizing an in-line pre-slit injetion site (492) and a shielded blunt cannula (512). An adapter for transferring fluids from a syringe with a blunt cannula to an evacuated tube, including a pre-slit injection site (554) and a shroud covered needle (556) with a rubber sleeve.

REFERENCES:
patent: 4233973 (1980-11-01), Shukla
patent: 4543088 (1985-09-01), Bootman et al.
patent: 4673386 (1987-06-01), Gordon
patent: 4763648 (1988-08-01), Wyatt
patent: 4834716 (1989-05-01), Ogle, II
patent: 4838855 (1989-06-01), Lynn
patent: 4874366 (1989-10-01), Zdeb et al.
patent: 4878897 (1989-11-01), Katzin
patent: 4920970 (1990-05-01), Wyatt
patent: 4944397 (1990-07-01), Miller
patent: 4981140 (1991-01-01), Wyatt

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