Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1995-08-28
1998-02-17
Buiz, Michael Powell
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604171, A61M 500
Patent
active
057186936
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 radially expand the diameter of cannula shaft (82), thus partially or completely closing the gap (32) and thereby preventing hematoma formation.
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patent: 5509909 (1996-04-01), Moy
patent: 5542936 (1996-08-01), Razi
Duthie; Medical Intelligence, Drainage of the Abdomen; vol. 287, No. 21, pp. 1081-1083.
Hanna; Efficiency of Peritoneal Drainage; Surgery, Gynecology & Obstetrics; Nov., 1970; pp. 983-985.
Buiz Michael Powell
Gring N. Kent
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