Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1997-12-09
1999-04-13
McDermott, Corrine M.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604164, 604168, 604110, A61M 532
Patent
active
058938443
ABSTRACT:
Disclosed is an indwelling needle set comprising a cylinder provided with a flexible outer needle composed of a synthetic resin at the tip thereof and a plunger which is inserted in the cylinder and is provided with a metallic inner needle at the tip thereof, wherein the plunger is provided with a piston which slidingly-contacts the surface of the inside wall of the cylinder, an orifice which opens to the inside of the cylinder in front of the piston, a rear opening formed at the rear end of the cylinder for connecting a connecting tube, and a conduit penetrating through the plunger and connecting the orifice with the rear end opening; and the plunger is inserted into the cylinder in a manner that the piercing position at which the tip of the inner needle projects from the tip of the outer needle is allowed to slide relative to the housing position at which the inner needle is housed after it is backed away. The indwelling needle set has excellent features by which a medicinal solution can be injected and blood can be removed while the inner needle is allowed to remain in the cylinder after it is backed away and a disadvantage caused by the presence of the inner needle within the cylinder, specifically, an increase in flow resistance caused by the passage of a medicinal solution or the like through the inside of a needle tube of the inner needle can be eliminated.
REFERENCES:
patent: 4417887 (1983-11-01), Koshi
patent: 4772265 (1988-09-01), Walter
patent: 4834718 (1989-05-01), McDonald
patent: 5403286 (1995-04-01), Lockwood, Jr.
McDermott Corrine M.
Misawa Medical Industry Co., Ltd.
Rodriguez Cris L.
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