Method of producing tapered or pointed cannula
First Claim
1. A method of producing a pointed cannula, comprising:
- providing a tubular stock having an axial passage;
heating the tubular stock at a first heating location to form a softened section, the softened section separating a workplace portion of the tubular stock from a remaining portion of the tubular stock;
heating the tubular stock at a second heating location, the second heating location being offset from the first heating location along a longitudinal direction of the tubular stock; and
drawing the workpiece portion away from the remaining portion to elongate the softened section and separate the workpiece portion from the remaining portion to form the tubular device,wherein the drawing separates the workpiece portion from the remaining portion at a beveled angle of between about 10°
to about 45°
with respect to a longitudinal axis of the tubular stock.
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Accused Products
Abstract
A method of producing a tubular device is provided. The method comprises providing a tubular stock having an axial passage, heating the tubular stock at a first heating location to form a softened section, the softened section separating a workpiece portion of the tubular stock from a remaining portion of the tubular stock, and drawing the workpiece portion away from the remaining portion to elongate the softened section and separate the workpiece portion from the remaining portion to form the tubular device. The drawing is performed at a rate such that the tubular device has an axial passage having a substantially uniform inside diameter, and an end of the tubular device formed from the elongated softened section is tapered.
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Citations
23 Claims
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1. A method of producing a pointed cannula, comprising:
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providing a tubular stock having an axial passage; heating the tubular stock at a first heating location to form a softened section, the softened section separating a workplace portion of the tubular stock from a remaining portion of the tubular stock; heating the tubular stock at a second heating location, the second heating location being offset from the first heating location along a longitudinal direction of the tubular stock; and drawing the workpiece portion away from the remaining portion to elongate the softened section and separate the workpiece portion from the remaining portion to form the tubular device, wherein the drawing separates the workpiece portion from the remaining portion at a beveled angle of between about 10°
to about 45°
with respect to a longitudinal axis of the tubular stock. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of producing a pointed cannula, comprising:
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providing a tubular stock having an axial passage; heating the tubular stock at a first heating location to form a softened section, the softened section separating a workpiece portion of the tubular stock from a remaining portion of the tubular stock; heating the tubular stock at a second heating location, the second heating location being offset from the first heating location along a longitudinal direction of the tubular stock; drawing the workpiece portion away from the remaining portion to elongate the softened section and separate the workpiece portion from the remaining portion to form the tubular device, wherein the drawing separates the workpiece portion from the remaining portion at a beveled angle of between about 10°
to about 45°
with respect to a longitudinal axis of the tubular stock, and;grinding the beveled end of the workpiece wherein said grinding produces at least one sharpened bevel. - View Dependent Claims (21, 22, 23)
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Specification