Blood lancet system for withdrawing blood for diagnostic purposes

US6409740B1 · kind B1 · utility

Assignee

• Roche Diagnostics GMBH · DE

Inventors

• Hans Kuhr · Mannheim, DE
• Herbert Argauer · Pirk, DE

Key dates

• Filing date: Oct 2, 2000
• Grant date: Jun 25, 2002
• Expiry date: Oct 21, 2020

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B5/15128
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

Blood lancet for withdrawing blood for diagnostic purposes. It has a housing with an outlet opening for the tip of a lancet, and a lancet drive with a drive rotor driven in a sense of rotation by a drive spring. The drive rotor converts the relaxation movement of the drive spring to a pricking movement, moving the lancet with high speed in pricking direction, until the tip protrudes from the outlet opening. The drive rotor has a pressure surface directed radially outwardly and running around the rotation axis with varying center distance. The pressure surface has a vertex with maximum center distance, and a propelling section, following the vertex against the sense of rotation and having a center distance decreasing against the sense of rotation. The drive spring effects a pressure on the propelling section of the pressure surface, thus driving the drive rotor in sense of rotation, whereas the drive rotor is coupled to the lancet holder.