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Blood lancet device

  • US 9,826,927 B2
  • Filed: 09/07/2012
  • Issued: 11/28/2017
  • Est. Priority Date: 09/09/2011
  • Status: Active Grant
First Claim
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1. A blood lancet device, comprising:

  • a housing provided with an opening at one end of the housing and guiding portions on an inner surface of the housing;

    a sliding sleeve having one end extending through said opening to an outside of the housing and the other end engaging with the guiding portions of the housing, the sliding sleeve being adapted to slide along an axial direction of said housing inside the housing;

    a blood lancet including a needle body and a needle tip disposed at one end of said needle body, said blood lancet adapted to move relative to said sliding sleeve so as to expose the needle tip at said opening; and

    a biasing member having one end engaged with the other end of the needle body,wherein said sliding sleeve is provided with at least one slot passing completely through a wall of the sliding sleeve, and the at least one slot extends toward said one end of the sliding sleeve from the other end of the sliding sleeve along a longitudinal axis of the sliding sleeve;

    wherein when the sliding sleeve is located at a first position within the housing, the other end of said sliding sleeve is pressed radially and inwardly by the guiding portions of the housing and elastically deformed radially and inwardly, such that the needle body is abutted against the other end of the sliding sleeve and is prevented from moving toward said opening of said housing;

    wherein when the sliding sleeve is moved to a second position within the housing, a pressing force applied on the other end of the sliding sleeve by the guiding portions is reduced or removed, such that said needle body is allowed to move toward said opening along said sliding sleeve under the action of the biasing member;

    wherein the other end of the sliding sleeve is configured to slide on the guiding portions and along a longitudinal axis of the housing during the first position to reach the second position;

    wherein said at least one slot includes two guiding slots extending toward said one end of the sliding sleeve from the other end of said sliding sleeve, said two guiding slots dividing said other end of the sliding sleeve into two guiding ends which can elastically deform toward each other;

    wherein said needle body also includes two lugs arranged in opposite, said two lugs are adapted to move along said two guiding slots under the action of the biasing member;

    wherein engagements between said guiding portions and said guiding ends are adapted to press two guiding ends so as to reduce the width of the guiding slots at said other end of the sliding sleeve to prevent said two lugs from moving toward said one end of said sliding sleeve along said two guiding slots under the action of the biasing member;

    wherein a tip end of each guiding end has a protrusion protruding radially and outwardly, and said protrusion is adapted to engage with said guiding portions; and

    wherein during movement of the sliding sleeve from the first position to the second position, the protrusion is continuously engaged and pressed radially and inwardly by said guiding portions such that when the sliding sleeve is at the second position, the protrusions move away from the lugs in a radial direction so that said lugs move up along said two guiding slots under the action of the biasing member.

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