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Finger pricking device

  • US 4,580,564 A
  • Filed: 06/07/1983
  • Issued: 04/08/1986
  • Est. Priority Date: 06/07/1983
  • Status: Expired due to Fees
First Claim
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1. An apparatus for drawing blood comprising:

  • a guide having a first end and a second end; and

    a weighted lancet having a selected mass no less than about 0.9 oz. and comprising a needle at one end positioned to protrude from the first end of said guide;

    said guide having a length greater than that of said weighted lancet;

    said weighted lancet mounted to slide freely in said guide without constraint through a selected distance;

    said selected mass and said selected distance selected such that, when said said guide is inverted with a finger adjacent the first end, inertial forces alone acting on said weighted lancet in free fall develop sufficient momentum to force the needle out of the first end and to puncture the finger, thereby drawing a drop of blood from the finger.

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