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US 9,039,638 B2Granted
Test unit for carrying out a one-time testing of a body fluid
AssigneeRoche Diagnostics Operations, Inc.
InventorTheo Arnitz
Life of this patent
Estimating the term…
Abstract
A test unit for carrying out blood analysis includes a lancing element that can be pricked into a body part which has a capillary channel for transporting the body fluid that leads from a lancing member to a target site. A pretensioned distal sterile cover and a liquid permeable proximal sterile cover are proposed for the lancing element that is advantageously formed as a deep-drawn component.
Claims11
A test unit, comprising:
- a lancing element configured to prick a body part, wherein the lancing element has a capillary channel for transporting a body fluid that leads from the lancing element to a target site;
- and
- a sterile cover arranged in front of the lancing element, wherein the cover is pretensioned to burst when pierced to create a passage opening in the cover, wherein the cross-section of the passage opening is several times larger than the piercing cross-section of the lancing element, wherein the passage opening is configured to prevent wiping of blood onto the sterile cover during retraction of the lancing element, wherein the sterile cover is formed by an elastic pretensioned tear-membrane.
A test unit, comprising:
- a receiving part having a free outlet opening;
- a lancing element received in the receiving part, the lancing element including a capillary channel, the lancing element having a pointed lancing member, the capillary channel being configured to transport blood via capillary action from the pointed lancing member to a proximal central aperture, the lancing element having a radially projecting front collar at the proximal central aperture;
- a distal sterile cover spanning the free outlet opening in a sterile-tight manner to protect the lancing element from contaminants, wherein the distal sterile cover is an elastic pretensioned tear-membrane that is pretensioned to burst abruptly and create a large passage opening in the membrane for passage of the lancing element, wherein the large passage in the membrane has a cross-section that is several times larger than a piercing cross-section of the lancing element, wherein the passage opening is configured to prevent wiping of blood off onto the membrane during retraction of the lancing element;
- a proximal sterile cover lying flat against the front collar of the lancing element, the proximal sterile cover covering the proximal central aperture of the lancing element, the proximal sterile cover being made of fiber fleece that is permeable to the blood, wherein the fiber fleece is configured to prevent passage of germs;
- a detection element positioned on a rear side of the proximal sterile cover, wherein the rear side of the proximal cover faces away from the lancing element, the detection element having a measuring field with a reagent for analyzing the blood;
- and
- a return spring arranged between the lancing element and the receiving part, wherein the return spring presses the front collar of the lancing element against the proximal sterile cover, wherein the return spring via the front collar further presses the proximal sterile cover against the measuring field to ensure capillary coupling for transporting the blood.
4 more elements
Dependencies are inferred from the claim text.