Cerebro-ventricular catheter
Abstract
Abstract THE INVENTION IS A VENTIRCULAR CATHETER FOR USE WITH VENTRICULO-ATRIAL SHUNTING DEVICES, AND CONSISTS OF A TUBING OF SOFT, TISSUE-COMPATIBLE MATERIAL WITH INTAKE APERTURES POSITIONED IN THE WALL OF THE TUBING AT ONE END THEREOF, THE END OF THE TUBING PREFERABLY BEING CLOSED. THIN MEMBRANES OF FLEXIBLE, TISSUE-COMPATIBLE MATERIAL ARE ATTACHED BETWEEN THE HOLES AND EXTEND OUTWARD FROM THE WALL OF THE TUBE. THE FLEXIBILITY IS SUCH THAT THE LIGHTEST CONTACT WITH ATTACHED TISSUE WILL BEND THE MEMBRANE AND PROTECT THE UNDERLYING HOLE. THE MEMBRANE MAY BE RADIALLY SLIT TO FACILITATE COLLAPSING UPON PASSING OF THE CATHETER THROUGH TISSUE. THE MEMBRANES ARE LONG ENOUGH, SO THAT WHEN THE CATHETER IS INSERTED IN TISSUE, THEY COVER THE APERTURES TO PREVENT SCRAPPING OF TISSUE THEREBY.
Inventors
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Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |