Interstitial fluid collection and constituent measurement
First Claim
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1. A method for testing a sample of body fluid, said method comprising:
- urging a sampler against a patient'"'"'s skin, said sampler including a penetration member sized to penetrate the patient'"'"'s skin into but not substantially through a dermal layer upon placement of said sampler against said skin;
drawing a sample of said fluid along said penetration member and out of said skin;
testing said sample for desired constituents.
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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.
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Citations
30 Claims
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1. A method for testing a sample of body fluid, said method comprising:
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urging a sampler against a patient'"'"'s skin, said sampler including a penetration member sized to penetrate the patient'"'"'s skin into but not substantially through a dermal layer upon placement of said sampler against said skin;
drawing a sample of said fluid along said penetration member and out of said skin;
testing said sample for desired constituents. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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- 10. An apparatus for obtaining a sample of body fluid, said apparatus comprising a penetration member with a fluid path-way 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.
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19. 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 having means to admit and retain a body fluid located residing in the dermal layer into said passageway; and
means for controlling the depth of the penetration of said conduit so that said conduit penetrates into the dermal layer of skin but not through the dermal layer. - View Dependent Claims (20, 21, 22)
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23. An apparatus for obtaining a sample of body fluid contained in the skin for determining a level of a constituent in the body fluid, said apparatus comprising:
a conduit defining a passageway and sized to penetrate into the skin wherein body fluid contained in the skin is admitted and retained in said passageway, said conduit including at least a section composed of a material which is transparent to a testing light of known intensity having a wavelength absorbable by the constituent
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24. A method for determining a level of a constituent in a body fluid, said method comprising:
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inserting a conduit into the skin;
collecting body fluid located within the skin in said conduit;
directing a light source through the constituent retained in said conduit to determine the level of a constituent in the body fluid. - View Dependent Claims (25, 26)
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27. A method for determining a level of a constituent in a body fluid, said method comprising:
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inserting a conduit into the dermal layer of skin but not through the dermal layer;
passing a sample of said body fluid located within the dermal layer into said conduit;
evaporating the liquid from said conduit so that only the constituent remains on the walls of the conduit; and
directing a light source through the constituent retained in said conduit to determine the level of a constituent in the body fluid. - View Dependent Claims (28)
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29. 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 further sized 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 and;
drawing said fluid along said fluid pathway. - View Dependent Claims (30)
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Specification