Cannula with parallel channels and sliding sheath

Details Cannula with parallel channels and sliding sheath Cannula with parallel channels and sliding sheath

1997-08-04

1999-10-19

McDermott, Corrine

Surgery

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

Material introduced into and removed from body through...

604 27, 604264, A61M 100

Patent

active

059680083

ABSTRACT:
An improved cannula having parallel conduits, one for removing material and one for injecting material, is disclosed. In certain medical procedures, it is necessary to deposit fluid while simultaneously withdrawing material in the same region. The present invention is designed to serve this task. The improved cannula of the present invention further features a sheath mounted on a needle for slidable movement therealong to facilitate the maneuvers required to perform the procedures. The cannula comprises a handle that includes a nozzle at one end which conveniently connects to a vacuum pump. The needle is connected to the handle and includes a plurality of apertures at a tip. A first conduit is formed from the apertures along the lumen of the needle through the handle and to the vacuum pump. Once the needle is inserted into a patient, the first conduit communicates the vacuum to a subdermal region which results in the removal of material therein. Simultaneously, a second conduit in the form of a capillary tube within the first conduit inserts fluid through a separate outlet into the same subdermal region. Alternatively, a second conduit can be formed in the annular region between the sheath and the needle to dispense the fluid into the subdermal region.

REFERENCES:
patent: 4014333 (1977-03-01), McIntyre
patent: 5160319 (1992-11-01), Emery et al.
patent: 5163433 (1992-11-01), Kagawa et al.
patent: 5379773 (1995-01-01), Hornsby
patent: 5718668 (1998-02-01), Arnett et al.
patent: 5738648 (1998-04-01), Lands et al.
patent: 5827218 (1998-10-01), Nguyen et al.
patent: 5846219 (1998-12-01), Vancaillie

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