Hematoma prevention apparatus and method
US5718693A · kind A · utility
Inventor
Key dates
| Filing date | Aug 28, 1995 |
| Grant date | Feb 17, 1998 |
| Priority date | — |
| Expiry date | Aug 28, 2015 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M25/0662
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Hematoma-preventing cannula assemblies (36, 79) are provided which comprise an elongated cannula (10, 80) preferably equipped with a blood-conveying sleeve (38) positioned about the cannula shaft (12, 82) and presenting a plurality of axial blood flow passageways (46). The cannula (10, 80) is inserted in the usual fashion with the distal end thereof passing through an opening (22a) of a blood vessel (14) and the proximal end outside the patient's body; this creates a gap (32) between the exterior surface of the cannula shaft (12, 82) and the adjacent margins of the opening (22a). The sleeve (38) is percutaneously located with the inner end (42) thereof adjacent opening (22a) and gap (32), whereas the outer end (40) of the sleeve (38) is located adjacent the proximal end of the cannula (10, 80). In use, seepage flow of blood through gap (32) exteriorly of the cannula shaft (12, 82) is directed through the passageways (46) and thus cannot collect in tissue adjacent the vessel (14) to form a hematoma. In an alternative embodiment, a diameter expansion cannula (80) is provided together with a tubular dilator (88). After positioning of the cannula (80), the dilator (88) is used to radia…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.