Device for acquiring a blood sample
First Claim
1. A device for acquiring a blood sample, the device comprising:
- a lancet for piercing into skin of a body part in a controlled forward and back movement and for subsequently and immediately, partially retracting in order to receive blood exiting from the piercing;
a puncture drive comprising a drive rod coupled to the lancet and a drive spring acting in a direction of a piercing axis of the lancet, wherein the drive spring is situated coaxially around the drive rod;
a control unit for controlling the piercing and retraction of the lancet according to a predetermined movement profile comprising at least one rapid propulsion phase, in which the lancet pierces up to a predetermined maximum piercing depth, and a rapid retraction phase, in which the lancet is partially retracted to a predetermined residual piercing depth;
a rotatable mounted flywheel, wherein a rotational axis of the flywheel is laterally offset from the piercing axis of the lancet; and
a coupling element for coupling the flywheel to the drive rod in such a manner that the propulsion phase of the lancet sets the flywheel into motion and, after reaching the maximum piercing depth, movement energy stored in the flywheel causes the retraction of the lancet.
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Accused Products
Abstract
A device for acquiring a blood sample comprising a lancet, a puncture drive having a drive rod coupled on the lancet, and a compression spring, which propels it is disclosed. A flywheel mass, which is mounted as to make it movable, is coupled to the drive rod. The flywheel mass can absorb kinetic energy during a propulsion phase and cause retraction of the lancet after reaching a maximum piercing depth. The flywheel mass can be a flywheel connected via a connecting rod to the drive rod and is set into rotation during propulsion of the lancet. After overcoming a dead center defining the maximum piercing depth, rotational energy stored in the flywheel causes the retraction of the lancet. At a specific angle, the rotation of the flywheel is stopped and the residual piercing depth is defined.
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Citations
14 Claims
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1. A device for acquiring a blood sample, the device comprising:
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a lancet for piercing into skin of a body part in a controlled forward and back movement and for subsequently and immediately, partially retracting in order to receive blood exiting from the piercing; a puncture drive comprising a drive rod coupled to the lancet and a drive spring acting in a direction of a piercing axis of the lancet, wherein the drive spring is situated coaxially around the drive rod; a control unit for controlling the piercing and retraction of the lancet according to a predetermined movement profile comprising at least one rapid propulsion phase, in which the lancet pierces up to a predetermined maximum piercing depth, and a rapid retraction phase, in which the lancet is partially retracted to a predetermined residual piercing depth; a rotatable mounted flywheel, wherein a rotational axis of the flywheel is laterally offset from the piercing axis of the lancet; and a coupling element for coupling the flywheel to the drive rod in such a manner that the propulsion phase of the lancet sets the flywheel into motion and, after reaching the maximum piercing depth, movement energy stored in the flywheel causes the retraction of the lancet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification