Syringe
First Claim
1. Apparatus for injecting or aspirating a fluid, including a liquid or paste, said apparatus comprising:
- (a) a first piston adapted to be in direct contact with said fluid;
(b) a second piston comprising a shaft adapted to coact with said first piston, said second piston being slideably mounted in a cylinder, said cylinder being divided by said second piston into a first chamber situated on the fluid injection side of said cylinder and a second chamber situated on the opposite side of said cylinder, the cylinder being adapted to be in fluid communication with a positive or negative pressure;
(c) at least one communication channel positioned between said second chamber and the exterior of said cylinder, said at least one communication channel having a chamber orifice opening into the second chamber and an exterior orifice opening to the exterior; and
(d) blocking means for blocking said channel;
whereby a positive or negative pressure in said second chamber relative to said first chamber while said communication channel is blocked results in the controllable movement of said first piston.
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Accused Products
Abstract
Apparatus for injecting or aspirating a fluid, including a liquid or paste. The apparatus includes a first piston adapted to be in direct contact with the fluid; and a second piston comprising a shaft adapted to coact with the first piston. The second piston is slideably mounted in a cylinder. The cylinder is divided by the second piston into a first chamber situated on the fluid injection side of the cylinder and a second chamber situated on the opposite side of the cylinder. The cylinder is adapted to be in fluid communication with a positive or negative pressure. At least one communication channel is positioned between the second chamber and the exterior of the cylinder. The at least one channel has a chamber orifice opening into the second chamber and an exterior orifice opening to the exterior. Blocking means for blocking the channel are also provided. The apparatus is such that a positive or negative pressure in the second chamber relative to the first chamber while the communication channel is blocked results in the controllable movement of the first piston.
48 Citations
19 Claims
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1. Apparatus for injecting or aspirating a fluid, including a liquid or paste, said apparatus comprising:
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(a) a first piston adapted to be in direct contact with said fluid; (b) a second piston comprising a shaft adapted to coact with said first piston, said second piston being slideably mounted in a cylinder, said cylinder being divided by said second piston into a first chamber situated on the fluid injection side of said cylinder and a second chamber situated on the opposite side of said cylinder, the cylinder being adapted to be in fluid communication with a positive or negative pressure; (c) at least one communication channel positioned between said second chamber and the exterior of said cylinder, said at least one communication channel having a chamber orifice opening into the second chamber and an exterior orifice opening to the exterior; and (d) blocking means for blocking said channel; whereby a positive or negative pressure in said second chamber relative to said first chamber while said communication channel is blocked results in the controllable movement of said first piston. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification