A - Human Necessities – 61 – M
Patent
A - Human Necessities
61
M
A61M 5/32 (2006.01) A61M 5/14 (2006.01) A61M 5/158 (2006.01) A61M 25/06 (2006.01)
Patent
CA 2273935
A self-blunting needle medical device comprises a needle cannula (18) fixed to a hub (20) having a receiving structure therein such as ferrule (22) and a movable blunting member (14) movably received within the cannula (l8). Ferrule (22) defines a sleeve bore (38) extending therethrough, within which both the cannula (18) and the movable member (14) can be received and which establishes a coaxial relationship between them. The ferrule (22) defines a first guide surface (40) for directing the blunting end (14a) of the movable member (14) into the central bore of the cannula (18) during assembly. A second guide surface (42) performs the function of guiding the proximal end (18b) of the cannula (18) into ferrule (22) for mounting therein. Typically, the cannula (18) has a tissue puncture tip (18a). When the movable member (14) is retracted into the cannula (18), the puncture tip (18a) is exposed for use, e.g., injection into tissue. The movable member (14) is then moved to an extended position in which blunting end (14a) projects beyond the puncture tip (18a), to render the device safe with regard to subsequent accidental needle sticks.
L'invention concerne un instrument médical à aiguille s'émoussant automatiquement, qui comprend une canule (18) d'aiguille fixée à un embout (20) doté d'une structure de réception, telle qu'une virole (22), et un élément d'émoussement mobile (14) coulissant à l'intérieur de la canule (18). La virole (22) comporte un alésage (38) qui la traverse de part en part et peut recevoir à la fois la canule (18) et l'élément mobile (14) en établissant entre ces derniers une relation coaxiale. La virole (22) comporte une première surface de guidage (40) pour guider l'extrémité d'émoussement (14a) de l'élément mobile (14) à l'intérieur de l'alésage central de la canule (18) pendant l'assemblage. Une deuxième surface de guidage (42) guide l'extrémité proximale (18b) de la canule (18) en vue de son montage à l'intérieur de la virole (22). La canule (18) comporte généralement une pointe de percement (18a) de tissus. En escamotant l'élément mobile (14) à l'intérieur de la canule (18), on expose la pointe de percement (18a) prête à l'emploi (injection à l'intérieur d'un tissu, par exemple). On déplace ensuite l'élément mobile (14) dans une position sortie dans laquelle l'extrémité d'émoussement (14a) fait saillie au-delà de la pointe de percement (18a), ce qui garantit la sûreté de l'instrument et permet d'éviter une piqûre accidentelle subséquente.
Burzynski Mark J.
Jones Alexander K.
Kearns Richard S.
Polidoro John M.
Sahi Carl R.
Bio-Plexus Inc.
Sim & Mcburney
LandOfFree
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