Preloadable syringe for automated dispensing device

Details Preloadable syringe for automated dispensing device Preloadable syringe for automated dispensing device

A - Human Necessities

61

M

A61M 5/315 (2006.01)

Patent

CA 2307207

The hollow cylindrical syringe body (10) has a channel (12) of uniform diameter. A fluid port (14) is situated at one end. The other end defines a funnel-like opening (20) with a diameter greater than that of the channel (12). A piston (24) is moved along the channel (12) by the end of a push rod (26) which is received through the channel opening (20). A ball (30) on the push rod (26) lodges in a socket (36) in the piston (24) as the rod pushes the piston (24) toward the port (14). The socket (36) is formed of resilient fingers (32, 34) which are held by the channel wall in position to retain the ball (30) in the socket (36), such that the piston (24) can be moved along the channel (12) to load the syringe. When the socket (36) aligns with the funnel- like opening (20) of the channel (12), the socket fingers (32, 34) spread apart to release the ball (30) from the socket (36), permitting the push rod (26) to be removed from the loaded syringe.

Le corps (10) cylindrique creux de la seringue comporte un canal (12) de diamètre uniforme. Un orifice (14) de fluide est situé à une extrémité. L'autre extrémité définit un orifice (20) de type entonnoir qui présente un diamètre supérieur à celui du canal (12). Un piston (24) est déplacé le long du canal (12) par l'extrémité d'une tige poussoir (26) qui est reçue par l'orifice (20) du canal. Une bille (30) située sur la tige poussoir (26) se loge dans une rotule (36) du piston (24) lorsque la tige pousse le piston (24) en direction de l'orifice (14). La rotule (36) est formée de doigts (32, 34) résilients qui sont maintenus par la paroi du canal dans une position permettant de retenir la bille (30) dans la rotule (36), de sorte que le piston (24) peut être déplacé le long du canal (12) pour charger la seringue. Lorsque la rotule (36) est alignée sur l'orifice (20) de type entonnoir du canal (12), les doigts (32, 34) de la rotule se séparent afin de libérer la bille (30) de la rotule (36), ce qui permet de retirer la tige poussoir (26) de la seringue chargée.

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