Retractable lancet assembly
First Claim
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1. A throw-away automatically retractable spring lancet assembly for piercing human skin which assembly includes means for preventing reuse, characterized by(a) a housing having an aperture;
- (b) a plurality of circumferentially spaced elongated openings on said housing;
(c) a lancet mounted in said housing for reciprocable movement therein;
(d) a point on said lancet positioned adjacent the interior side of said housing aperture;
(e) an un-compressed spring in said housing extending between said housing aperture and said lancet;
(f) a sleeve slidable on said housing;
(g) a plurality of elongated flexible arms on said sleeve with feet on the arms extending through said plurality of elongated openings and engaging said lancet;
(h) cooperating means in said openings and on said feet for simultaneously automatically, upon movement of said sleeve over said housing, compressing said spring, moving said lancet point through said housing opening and retracting said lancet point back into said housing; and
(i) said cooperating means including means for jamming said spring for preventing further movement of said lancet point through said housing opening after the retraction thereof.
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Abstract
A retractable lancet assembly includes a housing and a sharp-pointed lancet movably mounted inside the housing. A movable sleeve is adapted to urge the lancet point in a direction outwardly from the housing. This sleeve and surfaces on the housing contribute to automatically retracting the lancet point inwardly of the housing responsive to movement of the sleeve in the same direction that the sleeve urges the lancet point outwardly.
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Citations
9 Claims
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1. A throw-away automatically retractable spring lancet assembly for piercing human skin which assembly includes means for preventing reuse, characterized by
(a) a housing having an aperture; -
(b) a plurality of circumferentially spaced elongated openings on said housing; (c) a lancet mounted in said housing for reciprocable movement therein; (d) a point on said lancet positioned adjacent the interior side of said housing aperture; (e) an un-compressed spring in said housing extending between said housing aperture and said lancet; (f) a sleeve slidable on said housing; (g) a plurality of elongated flexible arms on said sleeve with feet on the arms extending through said plurality of elongated openings and engaging said lancet; (h) cooperating means in said openings and on said feet for simultaneously automatically, upon movement of said sleeve over said housing, compressing said spring, moving said lancet point through said housing opening and retracting said lancet point back into said housing; and (i) said cooperating means including means for jamming said spring for preventing further movement of said lancet point through said housing opening after the retraction thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification