Interstitial fluid collection and constituent measurement
AssigneeInteg, Inc.
InventorsBrian J. Erickson, Michael E. Hilgers, Tracy A. Hendrickson, J. Edward Shapland, Frank A. Solomon, Mark B. Knudson
Life of this patent
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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.
Claims30
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.
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.
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 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.
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
A method for determining a level of a constituent in a body fluid, said method comprising:
- 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.
A method for determining a level of a constituent in a body fluid, said method comprising:
- 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.
A method for collecting a sample of body fluid, said method comprising:
- 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.
Dependencies are inferred from the claim text.