Enhanced interstitial fluid collection
First Claim
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1. A method of collecting a sample of body fluid from a skin layer the method comprising:
- providing a sampling tool comprising a needle and a skin stretching member having opposing surfaces at least partially surrounding said needle, wherein said needle and said skin stretching member are independently movable relative to one another along a path substantially parallel to an axis of said needle;
placing said skin stretching member against the skin of a patient with said opposing surfaces at least partially surrounding and defining a fluid collection area;
advancing said skin stretching member relative to said needle to stretch a skin layer in the fluid collection area;
advancing said needle relative to said skin stretching member thereby inserting said needle into the fluid collection area of the stretched skin layer; and
collecting said sample of body fluid including interstitial fluid.
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Abstract
A sampling apparatus for interstitial fluid includes a pressure ring surrounding a collection needle. The pressure ring and needle are movable relative to one another for the ring to first engage a patient'"'"'s skin surface prior to insertion of the needle.
79 Citations
13 Claims
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1. A method of collecting a sample of body fluid from a skin layer the method comprising:
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providing a sampling tool comprising a needle and a skin stretching member having opposing surfaces at least partially surrounding said needle, wherein said needle and said skin stretching member are independently movable relative to one another along a path substantially parallel to an axis of said needle;
placing said skin stretching member against the skin of a patient with said opposing surfaces at least partially surrounding and defining a fluid collection area;
advancing said skin stretching member relative to said needle to stretch a skin layer in the fluid collection area;
advancing said needle relative to said skin stretching member thereby inserting said needle into the fluid collection area of the stretched skin layer; and
collecting said sample of body fluid including interstitial fluid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of collecting a sample of body fluid from skin, the method comprising:
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providing a fluid collection device comprising a piston having a distal surface, a needle operatively connected to said piston and having a distal end extending a distance from said distal piston surface, and a pressure surface adjacent said needle, said piston and said pressure surface being independently movable relative to one another along a path substantially parallel to the axis of said needle;
placing said pressure surface against the skin of a patient to define a fluid collection area advancing said pressure surface relative to said piston thereby stretching skin within the fluid collection area;
advancing said piston relative to said pressure surface thereby inserting said needle into the fluid collection area of the skin; and
collecting body fluid. - View Dependent Claims (10, 11, 12, 13)
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Specification