Interstitial fluid collection and constituent measurement
First Claim
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1. A method for testing the glucose level in a patient having skin laden with interstitial fluid, the method comprising:
- providing a testing apparatus comprising a needle;
penetrating the needle into, but not through, the skin;
extracting interstitial fluid from the skin, transporting the interstitial fluid directly from the patient to within the test apparatus; and
testing the glucose level of the interstitial fluid within the test apparatus.
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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
14 Claims
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1. A method for testing the glucose level in a patient having skin laden with interstitial fluid, the method comprising:
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providing a testing apparatus comprising a needle;
penetrating the needle into, but not through, the skin;
extracting interstitial fluid from the skin, transporting the interstitial fluid directly from the patient to within the test apparatus; and
testing the glucose level of the interstitial fluid within the test apparatus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
exposing the interstitial fluid to spectral radiation, the spectral radiation including a predetermined wavelength of light; and
determining whether the interstitial fluid absorbs the predetermined wavelength of light from the spectral radiation.
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9. The method of claim 8 wherein the predetermined wavelength of light is in the infrared portion of the spectral radiation.
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10. The method of claim 8 wherein the interstitial fluid is retained within the capillary tube when exposed to the spectral radiation.
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11. The method of claim 1 wherein the testing of the glucose level in the interstitial fluid comprises electrochemical testing.
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12. The method of claim 11 wherein the electrochemical testing comprises placing electrodes in electrical communication with the interstitial fluid.
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13. The method of claim 1 wherein the testing of the glucose level in the interstitial fluid comprises colorimetric testing.
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14. The method of claim 13 wherein the colorimetric testing comprises exposing the interstitial fluid to a chemical wherein the chemical changes color when exposed to glucose.
Specification