Safe and convenient, disposable automatic lancet

• US 9,005,231 B2
• Filed: 07/25/2011
• Issued: 04/14/2015
• Est. Priority Date: 12/21/2010
• Status: Active Grant

• Current Assignee: SteriLance Medical (Suzhou) Inc.
• Original Assignee: SteriLance Medical (Suzhou) Inc.
• Inventors: Shi, Guoping
• Primary Examiner(s): Shi, Katherine M
• Assistant Examiner(s): GABR, MOHAMED GAMIL
• Application Number:
  US13/995,946
• Publication Number:
  US 20140005710A1
• Time in Patent Office: 1,359 Days
• Field of Search: 606/182, 606/181, 606/183, 606/167, 606/170, 600573-584, 604/117, 604207-211
• US Class Current: 606/181
• CPC Class Codes: A61B 17/3496 Protecting sleeves or inner probes; Retractable tips for protecting body piercing guide needles A61M25/0612
• CPC Class Codes: A61B 5/1411 by percutaneous method, e.g. by lancet
• CPC Class Codes: A61B 5/150022 for capillary blood or interstitial fluid
• CPC Class Codes: A61B 5/150259 Improved gripping, e.g. with high friction pattern or projections on the housing surface or an ergonometric shape
• CPC Class Codes: A61B 5/150412 Pointed piercing elements, e.g. needles, lancets for piercing the skin blade-like piercing elements A61B5/150442
• CPC Class Codes: A61B 5/150519 Details of construction of hub, i.e. element used to attach the single-ended needle to a piercing device or sampling device
• CPC Class Codes: A61B 5/150549 Protectors removed by rotational movement, e.g. torsion or screwing
• CPC Class Codes: A61B 5/150618 Integrally moulded protectors, e.g. protectors simultaneously moulded together with a further component, e.g. a hub, of the piercing element
• CPC Class Codes: A61B 5/150717 manually removed
• CPC Class Codes: A61B 5/150916 by blocking components, e.g. piston, driving device or fluid passageway
• CPC Class Codes: A61B 5/15113 Manually triggered, i.e. the triggering requires a deliberate action by the user such as pressing a drive button
• CPC Class Codes: A61B 5/15117 comprising biased elements, resilient elements or a spring, e.g. a helical spring, leaf spring, or elastic strap
• CPC Class Codes: A61B 5/1513 comprising linear sliding guides comprising tooth-shaped elements A61B5/15132
• CPC Class Codes: A61B 5/15144 comprising driving means, e.g. a spring, for retracting the piercing unit into the housing

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.

Claims

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 two spaced apart sets of pressing legs, wherein each set of the pressing leg comprising a first pressing leg (11) and a second pressing leg (19), wherein the first and second pressing leg are spaced apart, both set of the pressing legs are inserted into the ejection chamber(5), wherein in a state of to-be-launched, a first distance between each of the second pressing leg (19) and the needle tip (7) is less than a second distance between each of the first pressing leg (11) and the needle tip (7);

each of the first pressing leg (11) is close to or contacts with the end of the elastic arm (8); and

each of 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 each of 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.

2. The lancet of claim 1, wherein when the protective sleeve (20) occupies the press-down channel (17), a width of the press- down channel (17) is less than an allowable insertion width of the second pressing leg (19), and when the protective sleeve (20) is removed from the press-down channel (17), the width of the press-down channel (17) is equal to or larger than the allowable insertion width of the second pressing leg (19).

3. The lancet of claim 1, wherein when the protective sleeve (20) occupies the press-down channel (17), the press-down channel (17) is blocked, and when the protective sleeve (20) is removed from the press-down channel (17), the press-down channel (17) is opened.

4. The lancet of claim 1, wherein the first pressing leg (11) and the second pressing leg (19) are both “

U”

shaped branch structure in the cross section perpendicular to the axis of the needle body (14), wherein, the “

U”

shaped branch structure of the first pressing leg (11) and the second pressing leg (19) respectively are close to or contact with the end of the elastic arm (8) from two sides of the needle core (2) and across the ejection chamber (5) , each of the two arms of the “

U”

shaped branch structure of the second pressing leg (19) is provided with the barb (12) on one side of the arm facing toward the housing (1), and on each side of the housing (1) corresponding to the barb (12), one self-locking hook (13) is provided.

5. The lancet of claim 1, wherein the elastic arm (8) is inclined to the ejection chamber (5).