Method and device for the extraction of a body fluid
First Claim
1. A method of collecting body fluid with a lancing element having a tip and a capillary structure formed in the lancing element, comprising:
- inserting the tip of the lancing element into the skin of a body part to a puncture depth;
retracting the tip from the puncture depth to a lesser depth than the puncture depth;
retracting the tip from the lesser depth toward the skin surface, wherein the retracting of the tip from the puncture depth to the lesser depth is faster than the retracting of the tip from the lesser depth toward the skin surface;
detecting contact between the lancing element and the body fluid after the tip has been retracted to the lesser depth;
collecting body fluid with the lancing element; and
determining from the detecting step whether a sufficient volume of body fluid has been collected by the lancing element.
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Accused Products
Abstract
The present invention provides a method and a device for piercing a body part and determining whether a sufficient volume of blood has been withdrawn. A lancing element is rapidly inserted into a body part in a forward phase and retracted quickly to a lesser puncturing depth. Subsequently, the lancing element is retracted slower than during the first retraction movement and the distance retracted during the second retraction is shorter than the first retraction movement. During the second retraction movement, body fluid is collected in a collection phase by a capillary structure of the lancing element. Contact between the lancing element and the body fluid is detected after the forward phase at the beginning and the end of a waiting period.
24 Citations
25 Claims
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1. A method of collecting body fluid with a lancing element having a tip and a capillary structure formed in the lancing element, comprising:
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inserting the tip of the lancing element into the skin of a body part to a puncture depth; retracting the tip from the puncture depth to a lesser depth than the puncture depth; retracting the tip from the lesser depth toward the skin surface, wherein the retracting of the tip from the puncture depth to the lesser depth is faster than the retracting of the tip from the lesser depth toward the skin surface; detecting contact between the lancing element and the body fluid after the tip has been retracted to the lesser depth; collecting body fluid with the lancing element; and determining from the detecting step whether a sufficient volume of body fluid has been collected by the lancing element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 23, 24, 25)
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14. A lancing device for collecting body fluid, comprising:
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a housing; a lancing element reciprocably mounted in the housing, the lancing element including a tip that is exposed for puncturing a body part and the lancing element including a capillary structure adapted to collect body fluid; a lancing drive connected to the lancing element, the lancing drive configured to move the lancing element in a forward phase to a puncture depth, a retraction from the puncture depth to a lesser depth, and a retraction from the lesser depth toward the skin surface, the retraction from the puncture depth to the lesser depth being faster than the retraction from the lesser depth toward the skin surface; and a detection mechanism adapted to detect contact between the lancing element and the body fluid by measuring a signal that varies as a function of contact between the lancing element and the body fluid, the detection mechanism configured to measure and compare the signal at the beginning and at the end of a waiting period that is initiated after the forward phase. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. A method of collecting body fluid with a lancing element having a tip and a capillary structure formed in the lancing element, comprising:
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inserting the tip of the lancing element into the skin of a body part to a puncture depth; retracting the tip from the puncture depth to a lesser depth than the puncture depth; removing the tip of the lancing element from the skin after the tip is retracted to the lesser depth; reinserting the tip into the skin; then detecting contact between the lancing element and the body fluid after the tip has been retracted to the lesser depth; and determining from the detecting step whether a sufficient volume of body fluid has been collected by the lancing element.
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Specification