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, comprising:
- inserting the tip of the lancing element into the skin of a body part to a puncture depth;
retracting the tip by a first distance during a retraction phase, the first distance being measured from the puncture depth to a lesser depth than the puncture depth;
retracting the tip by a second distance during a collection phase, the second distance being measured from the lesser depth to the skin surface; and
the retraction phase being faster than the collection phase and the first distance being greater than the second distance.
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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provides a method and a device for piercing a body part and determining whether a sufficient volume of blood has been withdrawn.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.
91 Citations
23 Claims
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1. A method of collecting body fluid with a lancing element having a tip and a capillary structure, 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 by a first distance during a retraction phase, the first distance being measured from the puncture depth to a lesser depth than the puncture depth; retracting the tip by a second distance during a collection phase, the second distance being measured from the lesser depth to the skin surface; and the retraction phase being faster than the collection phase and the first distance being greater than the second distance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. 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 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 followed by a retraction phase and a collection phase following the retraction phase; and the lancing drive further configured to retract the lancing element by a first distance during the retraction phase and to retract the lancing element by a second distance during the collection phase, wherein the retraction phase is faster than the collection phase and the first distance is greater than the second distance. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification