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Blood lancing device

  • US 4,712,548 A
  • Filed: 12/19/1985
  • Issued: 12/15/1987
  • Est. Priority Date: 04/23/1980
  • Status: Expired due to Term
First Claim
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1. A disposable miniature lancing device for obtaining a drop of blood by cutting the skin without passing through the body of the patient comprising a cylinder and a plunger, at least said cylinder being formed of a material distendable under force applied thereto, said plunger being insertable at its front end into said cylinder, said plunger and said cylinder having a slight clearance enabling said plunger to be freely slidable within said cylinder, sadi plunger having a radially extending flange at its rear end engageable with the rear end of said cylinder for limiting passage of said plunger throguh said cylinder and defining the full insertion of said plunger in said cylinder, a lancet integrally formed with said plunger and having a cutting edge projecting axially from said front end of said plunger, said plunger, cylinder and lancet being so formed that said lancet protrudes from the front end of said cylinder a predetermined distance when said plunger is fully inserted within said cylinder, said cutting edge extending transversely to said plunger in a longitudinal plane passing through the central axis of said lancet and having a pair of identical inclined surfaces extending on either side of said longitudinal plane freom said cutting edge and forming uniform angles with the central plane.

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