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Interstitial fluid collection and constituent measurement

  • US 5,582,184 A
  • Filed: 10/11/1994
  • Issued: 12/10/1996
  • Est. Priority Date: 10/13/1993
  • Status: Expired due to Term
First Claim
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1. An apparatus for obtaining a sample of body fluid, said apparatus comprising:

  • a penetration member with a fluid pathway for fluid to flow at least partially along a length of said member, said member sized to penetrate at least into the dermal layer of skin, said penetration member having a fluid entrance to admit into said fluid pathway a body fluid residing in the dermal layer; and

    means for controlling a depth of the penetration of said penetration member so that said fluid entrance penetrates into the dermal layer of skin but not through the dermal layer for a substantially blood free sample of fluid from said layer to flow into said pathway through said entrance.

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