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
First Claim
Patent Images

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.

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