System for withdrawing body fluid

• US 8,523,894 B2
• Filed: 09/24/2007
• Issued: 09/03/2013
• Est. Priority Date: 05/26/2000
• Status: Active Grant

• Current Assignee: Roche Diabetes Care Inc. (Roche Holding AG)
• Original Assignee: Roche Diagnostics Operations Incorporated (Roche Holding AG)
• Inventors: Schmelzeisen-Redeker, Guenther, Weiss, Thomas, Deck, Frank, Ebert, Klaus Peter
• Primary Examiner(s): Nia, Alireza
• Application Number:
  US11/903,711
• Publication Number:
  US 20080021494A1
• Time in Patent Office: 2,171 Days
• Field of Search: 600/583, 600/584, 604/101.05, 604/103.03, 604115-117, 606/181
• US Class Current: 606/181
• CPC Class Codes: A61B 5/150022 for capillary blood or interstitial fluid
• CPC Class Codes: A61B 5/150068 by tissue compression, e.g. with specially designed surface of device contacting the skin area to be pierced
• CPC Class Codes: A61B 5/150389 Hollow piercing elements, e.g. canulas, needles, for piercing the skin
• CPC Class Codes: A61B 5/150519 Details of construction of hub, i.e. element used to attach the single-ended needle to a piercing device or sampling device
• CPC Class Codes: A61B 5/15113 Manually triggered, i.e. the triggering requires a deliberate action by the user such as pressing a drive button
• CPC Class Codes: A61B 5/15186 Devices loaded with a single lancet, i.e. a single lancet with or without a casing is loaded into a reusable drive device and then discarded after use; drive devices reloadable for multiple use
• CPC Class Codes: A61B 5/157 Devices characterised by integrated means for measuring characteristics of blood

Abstract

The present invention relates to a compression device for stimulating the efflux of a body fluid from a body part. The device has a compression unit with a pressure-application region made of a deformable material, the region being formed to generate a repulsive force between the body part and the compression unit. The repulsive force passes through a force maximum then decreases to serve as an indication that the body part is guided sufficiently firmly and far enough onto the compression unit.

Claims

1. A lancing device comprising a compression unit for stimulating the efflux of a body fluid from a body part, the compression unit having a pressure-application region made of a deformable material, the pressure-application region comprising an opening with a rim, wherein the width of the opening is reduced as the body part is pressed against the rim, wherein the compression unit includes a plate and the pressure-application region includes a lower conically tapering region widening towards the plate and an upper conically tapering region narrowing towards the plate.

2. The device of claim 1 wherein the pressure-application region is formed to increase the repulsive force as the body part is pressed against the compression unit.

3. The device of claim 1, wherein the upper and lower conically tapering regions are formed to cooperate so that the primary movement of the body part against the upper conically tapering region perpendicular to the plate is at least partially converted into a transverse movement.

4. The device of claim 1 wherein the deformable material of the pressure-application region is an elastomer.

5. The device of claim 1 wherein the rim is in the form of a ring.

6. The device of claim 1, wherein the opening has an inner width in the range of at least 8 mm-11 mm.