SAFE AND CONVENIENT, DISPOSABLE AUTOMATIC LANCET
First Claim
1. An improved safe and convenient disposable automatic lancet, comprising a housing (1), a needle core (2) and a spring (3), wherein:
- the needle core (2) is provided with a needle body (14) having a needle tip (7);
the housing (1) defines an ejection chamber (5) in which the needle core (2) is located, wherein the needle core (2) has one end provided with a protective rod (4) and another end fixed with the spring (3), the protective rod (4) has one end protruding from a needle ejecting hole (6) and another end detachably connected to the needle core (2);
the housing has an elastic arm (8) extending toward the inside of the ejection chamber (5), for locking the needle core (2), a bayonet (9) is provided on the needle core (2), corresponding to an end of the elastic arm (8), and the end of the elastic arm (8) snaps fit with the bayonet (9), wherein the housing (1) is provided with a trigger button (10) which has a first pressing leg (11) and a second pressing leg (19), both of the legs are inserted into the ejection chamber (5), wherein in a state of to-be-launched, the distance between the second pressing leg (19) and the needle tip (7) is less than the distance between the first pressing leg (11) and the needle tip (7);
the first pressing leg (11) is close to or contacts with the end of the elastic arm (8); and
the second pressing leg (19) is provided with a barb (12), corresponding to which a self-locking hook (13) is provided on the housing (1);
the self-locking hook (13) is positioned in a press-down route of the barb (12) when the second pressing leg (19), together with the barb (12) provided thereon, is pressed downward, the barb (12) and the self-locking hook (13) forms a self-locking fit;
a press-down channel (17) is left in the ejection chamber (5), along the press-down route of the second pressing leg (19);
the protective rod (4) is provided with a safety sleeve (20), and when the protective rod (4) is assembled, the safety sleeve (20) covers the needle tip (7) and occupies the space of the press-down channel (17) to prevent the second pressing leg (19) from pressing downward;
when the protective rod (4) is removed, the safety sleeve (20) is withdrawn from the press-down channel (17) to allow the second pressing leg (19) to be pressed downward, so as to bring the barb (12) and the self-locking hook (13) into a self-locking fit.
1 Assignment
0 Petitions
Accused Products
Abstract
An improved safe and convenient disposable automatic lancet, comprising a housing (1), a needle core (2), a spring (3) and a protective rod (4), wherein, a pressing arm of a trigger button (10) is divided into a first pressing leg (11) and a second pressing leg (19), and the first pressing leg (11) is used for triggering an elastic arm in a locking structure to form a press-type trigger structure, and the second pressing leg (19) fits with a safety sleeve (20) and a press-down channel (17) to achieve a safety function of the trigger button (10); a barb (12) on the second pressing leg (19) fits with a self-locking hook (13) on the housing (1) so as to achieve a self-locking function after one press. In order to shorten the exposed needle length of a needle body on the needle core (2), in the automatic lancet, the distance between the second pressing leg (19) and the needle tip (7) is designed to be less than the distance between the first pressing leg (11) and the needle tip (7). Since the exposed needle length depends on the position of the safety sleeve (20), the exposed needle length is shortened, therefore the puncture performance increases, which enables the design of the lancet to be more reasonable and practical.
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Citations
5 Claims
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1. An improved safe and convenient disposable automatic lancet, comprising a housing (1), a needle core (2) and a spring (3), wherein:
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the needle core (2) is provided with a needle body (14) having a needle tip (7); the housing (1) defines an ejection chamber (5) in which the needle core (2) is located, wherein the needle core (2) has one end provided with a protective rod (4) and another end fixed with the spring (3), the protective rod (4) has one end protruding from a needle ejecting hole (6) and another end detachably connected to the needle core (2); the housing has an elastic arm (8) extending toward the inside of the ejection chamber (5), for locking the needle core (2), a bayonet (9) is provided on the needle core (2), corresponding to an end of the elastic arm (8), and the end of the elastic arm (8) snaps fit with the bayonet (9), wherein the housing (1) is provided with a trigger button (10) which has a first pressing leg (11) and a second pressing leg (19), both of the legs are inserted into the ejection chamber (5), wherein in a state of to-be-launched, the distance between the second pressing leg (19) and the needle tip (7) is less than the distance between the first pressing leg (11) and the needle tip (7);
the first pressing leg (11) is close to or contacts with the end of the elastic arm (8); and
the second pressing leg (19) is provided with a barb (12), corresponding to which a self-locking hook (13) is provided on the housing (1);
the self-locking hook (13) is positioned in a press-down route of the barb (12) when the second pressing leg (19), together with the barb (12) provided thereon, is pressed downward, the barb (12) and the self-locking hook (13) forms a self-locking fit;a press-down channel (17) is left in the ejection chamber (5), along the press-down route of the second pressing leg (19);
the protective rod (4) is provided with a safety sleeve (20), and when the protective rod (4) is assembled, the safety sleeve (20) covers the needle tip (7) and occupies the space of the press-down channel (17) to prevent the second pressing leg (19) from pressing downward;
when the protective rod (4) is removed, the safety sleeve (20) is withdrawn from the press-down channel (17) to allow the second pressing leg (19) to be pressed downward, so as to bring the barb (12) and the self-locking hook (13) into a self-locking fit. - View Dependent Claims (2, 3, 4, 5)
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Specification