Cannula and method of manufacture and use
US6533770B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 1998 |
| Grant date | Mar 18, 2003 |
| Priority date | — |
| Expiry date | Jan 21, 2018 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2025/0046
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A cannula having reinforced sections and nonreinforced sections, the nonreinforced sections having openings communicating with the lumen of the cannula. The nonreinforced sections are plain tubing and the reinforced sections are formed by winding a coated elongate member in a helical manner around a mandrel. The coated elongate member preferably has a square cross-sectional shape so that adjacent portions of the coated elongate member engage one another when the coated elongate member is wound around the mandrel. The coated elongate member is then heated so that the coating on adjacent portions of the coated elongate member fuse together to form an integral structure. Another layer of material may be provided on the radially inner or outer wall of the coated elongate member. The resulting tubular body is reinforced by the elongate member which is encased in the fused coating. The tubular body is cut into sections which are fused to the plain tubing sections to form the cannula. The reinforced sections and the plain tubing sections are alternately disposed along all or a portion of the length of the cannula. The openings are formed in the plain tubing sections for withdrawing or del…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.