Needle's eye snare
US5562678A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 2, 1995 |
| Grant date | Oct 8, 1996 |
| Priority date | — |
| Expiry date | Jun 2, 2015 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2210/0019
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A reversible snare (10) for grasping and retrieving an article (15) such as a cardiac lead from within a human or veterinary patient (20) includes a sheath member (25) adapted for introduction into the patient (20), and a retractable closed loop (30) carried by the sheath member (25). The closed loop (30) is composed of a shape memory material and defines a hook (35) adapted to partly encircle the article (15). The snare further includes a threader (45) also carried by the sheath member (25), the threader (45) being reversibly extendable through the closed loop (30) (like a thread through a needle's eye) so that the hook (35) and threader (45) can fully encircle the article (15). Retraction of the closed loop (30) causes the hook (35) and threader (45) to close around the article (15) and permit its withdrawal into the sheath member (25). Independent retraction of the threader (45) allows the hook (35) to disengage from the article (15). The closed loop (30) and threader (45) are both preferably composed of nitinol wire, and the loop (30) possesses a nose (40) narrower than the inside diameter of the sheath member (25), in order to minimize deformation or fracture of the closed loo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.