METHOD TO FABRICATE A NEEDLE HAVING A TAPERED PORTION BETWEEN A DISTAL TIP AND A LONGITUDINAL CHANNEL

A novel method to fabricate a needle includes stamping an elongated shape in a flat metal sheet. The elongated shape defines a longitudinal axis and two edges that are substantially parallel to the longitudinal axis. Each of the two edges includes an inward curve with relative alignment to create a...

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Bibliographische Detailangaben
Hauptverfasser:	BRINK DAMON DOUGLAS, REITZ JAMES ALLEN, REID SANDRA GAYLE
Format:	Patent
Sprache:	eng
Schlagworte:	DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROMTHE BODY HUMAN NECESSITIES HYGIENE MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL MEDICAL OR VETERINARY SCIENCE PERFORMING OPERATIONS PUNCHING METAL TRANSPORTING WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Beschreibung
Zusammenfassung:	A novel method to fabricate a needle includes stamping an elongated shape in a flat metal sheet. The elongated shape defines a longitudinal axis and two edges that are substantially parallel to the longitudinal axis. Each of the two edges includes an inward curve with relative alignment to create a relatively narrow neck. A longitudinal channel is formed to give the elongated shape a U-shaped cross-section in a plane normal to the longitudinal axis. The method includes punching through the neck with a punch that slides along a punching axis that intersects the longitudinal axis with an angle in the range 15° to 50°. Alternatively the method includes coining a thinned region that spans the neck and may define a V-shape in a major plane of the flat metal sheet, and separating the elongated shape along the thinned region after coining.