SAFE SIMPLE DISPOSABLE AUTOMATIC BLOOD LANCET

• US 20110276074A1
• Filed: 06/13/2011
• Published: 11/10/2011
• Est. Priority Date: 12/30/2008
• Status: Active Grant

• Current Assignee: SteriLance Medical (Suzhou) Inc.
• Original Assignee: SteriLance Medical (Suzhou) Inc.
• Inventors: SHI, Guoping
• Granted Patent: US 8,740,924 B2
• Time in Patent Office: Days
• US Class Current: 606/182
• CPC Class Codes: A61B 5/150022 for capillary blood or interstitial fluid
• 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 5/150511 Details of construction of shaft
• 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 5/15142 Devices intended for single use, i.e. disposable

Abstract

A safe simple disposable automatic blood lancet is disclosed in the present invention, including a casing, a lancet core, a spring and a protective bar. It has the following features: The ejection cavity is provided inside with a space that allows the push arm to move downwards; the protective bar is provided at the end inside the ejection cavity with a safety action portion; with the protective bar assembled, this safety action portion occupies the space in the X, Y or Z direction, so as to prevent the barb from being self-locked with the self-locking barb with the push arm moving downwards; with the protective bar disassembled, this safety action portion withdraws from the space, so as to allow the barb to be self-locked with the self-locking barb with the push arm moving downwards. The present invention allows the lancet core to be assembled into the locking state of ready for ejection; the blood lancet can be placed into the ejection state just by twisting off the protective bar during application, and into the locking state automatically after ejection so as to be unreusable. Compared with the prior art, the present invention fully attains the purpose of more advanced technology, simpler operation, and safer application.

Claims

1. A safe simple disposable automatic blood lancet, comprising:

a casing, a lancet core and a spring;

the casing forms an ejection cavity, which is provided at one end with a pinhole;

the lancet core is arranged inside the ejection cavity and provided at one end with a protective bar, one end of which is protruded out of the pinhole of the casing;

the lancet core is provided inside with a needle, a needle point of which is located inside the protective bar and oriented towards the pinhole;

the protective bar and the lancet core are connected by muff-coupling or via a neck that can be twisted broken to enable a demountable connection; and

the spring is arranged at the other end of the lancet core, thus forming an ejection structure with which the spring can push the lancet core to move;

the casing extends into the ejection cavity to form a flexible arm used for locking the lancet core; and

the lancet core is provided with a bayonet corresponding to this flexible arm, which is engaged at the end with the bayonet, thus forming a locking structure in a ready-for-ejection state that will appear after the lancet core compresses the spring;

the casing is provided with a trigger button, which is formed by an extension on the casing or an independent member mounted on the casing; and

the trigger button is provided with a push arm, which transversely passes through the ejection cavity to get close to or in touch with the end of the flexible arm, thus forming a push-type trigger structure; and

the trigger button is provided on the push arm with a barb;

the casing is provided with a self-locking barb corresponding to the barb, which is located in downward path of the barb; and

a self-locking structure can be formed by the barb engaged with the self-locking barb after the trigger button is pushed once;

characterized in that;

the ejection cavity is provided inside with a space that allows the push arm to move downwards, Z direction of the space being defined as a direction along which the push arm moves downwards and X direction parallel to axis of the needle;

the protective bar is provided at the end inside the ejection cavity with a safety action portion;

with the protective bar assembled, this safety action portion occupies the space in the X, Y or Z direction or simultaneously in arbitrary two of the X, Y and Z directions, and prevents the push arm from moving downwards to drive the barb to be self-locked with the self-locking barb;

with the protective bar disassembled, this safety action portion withdraws from the space and allows the push arm to move downwards to drive the barb to be self-locked with the self-locking barb; and

thus a safety structure of the trigger button is formed.

2. The safe simple disposable automatic blood lancet according to claim 1, characterized in that:

the safety action portion is composed of a safety foot extended from an end of the protective bar;

with the protective bar assembled, the safety foot occupies the space in the Y direction, making width of the space in the Y direction smaller than the width at which the push arm can be inserted;

with the protective bar disassembled, the safety foot withdraws from the space, making the width of the space in the Y direction bigger than or equal to the width at which the push arm can be inserted.

3. The safe simple disposable automatic blood lancet according to claim 1, characterized in that:

the safety action portion is composed of a safety jacket extended from the end of the protective bar;

with the protective bar assembled, the safety jacket occupies the space in the Y direction, making the width of the space in the Y direction smaller than the width at which the push arm can be inserted;

with the protective bar disassembled, the safety jacket withdraws from the space, making the width of the space in the Y direction bigger than or equal to the width at which the push arm can be inserted.

4. The safe simple disposable automatic blood lancet according to claim 1, characterized in that:

the safety action portion is composed of a safety wing extended from the end of the protective bar;

with the protective bar assembled, the safety wing occupies the space in the X direction, making width of the space in the X direction smaller than the width at which the push arm can be inserted;

with the protective bar disassembled, the safety wing withdraws from the space, making the width of the space in the X direction bigger than or equal to the width at which the push arm can be inserted.

5. The safe simple disposable automatic blood lancet according to claim 1, characterized in that:

the safety action portion is composed of a safety bolt extended from the end of the protective bar;

with the protective bar assembled, the safety bolt occupies the space in the Z direction, making the space blocked in the Z direction;

with the protective bar disassembled, the safety bolt withdraws from the space, making the space vacant in the Z direction.

6. The safe simple disposable automatic blood lancet according to claim 1, characterized in that:

the safety action portion is composed of the safety jacket and the safety wing extended from the end of the protective bar;

with the protective bar assembled, the safety jacket occupies the space in the Y direction, and the safety wing in the X direction, making the widths of the space in the Y and X directions both smaller than the width at which the push arm can be inserted;

with the protective bar disassembled, both the safety jacket and the safety wing withdraw from the space, making the widths of the space in the Y and X directions bigger than or equal to the width at which the push arm can be inserted.

7. The safe simple disposable automatic blood lancet according to claim 1, characterized in that:

the safety action portion is composed of the safety foot and the safety wing extended from the end of the protective bar;

with the protective bar assembled, the safety foot occupies the space in the Y direction, and the safety wing in the X direction, making the widths of the space in the Y and X directions both smaller than the width at which the push arm can be inserted;

with the protective bar disassembled, both the safety foot and the safety wing withdraw from the space, making the widths of the space in the Y and X directions bigger than or equal to the width at which the push arm can be inserted.

8. The safe simple disposable automatic blood lancet according to claim 1, characterized in that:

the push arm of the trigger button is a “

U-shaped”

branch structure, whose two arms get close to or in touch with the end of the flexible arm transversely through the ejection cavity from both sides of the lancet core, respectively;

the two arms are provided on the side towards the casing with the barb, respectively; and

the casing is provided on the side corresponding to each of the barbs with one self-locking barb, respectively.

9. The safe simple disposable automatic blood lancet according to claim 1, characterized in that:

the flexible arm is slantly arranged towards inside of the ejection cavity.