Interstitial fluid collection and constituent measurement
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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Abstract
An apparatus and method is disclosed for obtaining and measuring constituents in a sample of body fluid. The apparatus includes a member which is sized to penetrate into at least the dermal layer of skin to collect a sample of body fluid located within the dermal layer.
1423 Citations
20 Claims
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1. An apparatus for obtaining a sample of body fluid, said apparatus comprising:
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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. - View Dependent Claims (2, 3, 4)
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5. An apparatus for obtaining a sample of body fluid, said apparatus comprising:
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a penetration member having a fluid pathway for fluid to flow at least partially along the length of said member, said member sized to penetrate at least into the dermal layer of a patient'"'"'s skin for a sample of said fluid to flow along said pathway; and limit means to limit penetration of said penetration member into and not through said dermal layer. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for collecting a sample of body fluid, said method comprising:
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selecting a penetrating member having a length sized to partially extend into the dermal layer of skin and having a fluid pathway for fluid to flow at least partially along a length of said member and sizing said member to collect said fluid upon insertion of said member into said skin and without substantial pain upon insertion; inserting said penetrating member into said skin a depth selected for said penetration member to penetrate into and not through said dermal layer; and drawing said fluid along said fluid pathway. - View Dependent Claims (20)
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Specification