Preloadable syringe for automated dispensing device
First Claim
1. A syringe comprising a hollow cylindrical body with a channel defined by a wall with a substantially uniform inner diameter, a fluid port at one end of said body and a second body end, said second body end comprising an opening with a diameter greater than said diameter of said channel, a piston adapted to received in and moved along said channel, a push rod adapted to extend through said second body end opening and into said channel to move said piston along said channel, means for conditionally engaging said rod and said piston, said engaging means normally cooperating with said channel wall to maintain said engagement, but when aligned with said second body end opening such that it can no longer cooperate with said channel wall, disengaging said rod from said piston to permit removal of said rod from said syringe.
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Accused Products
Abstract
The hollow cylindrical syringe body has a channel of uniform diameter. A fluid port is situated at one end. The other end defines a funnel-like opening with a diameter greater than that of the channel. A piston is moved along the channel by the end of a push rod which is received through the channel opening. A ball on the push rod lodges in a socket in the piston as the rod pushes the piston toward the port. The socket is formed of resilient fingers which are held by the channel wall in position to retain the ball in the socket, such that the piston can be moved along the channel to load the syringe. When the socket aligns with the funnel-like opening of the channel, the socket fingers spread apart to release the ball from the socket, permitting the push rod to be removed from the loaded syringe.
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Citations
27 Claims
- 1. A syringe comprising a hollow cylindrical body with a channel defined by a wall with a substantially uniform inner diameter, a fluid port at one end of said body and a second body end, said second body end comprising an opening with a diameter greater than said diameter of said channel, a piston adapted to received in and moved along said channel, a push rod adapted to extend through said second body end opening and into said channel to move said piston along said channel, means for conditionally engaging said rod and said piston, said engaging means normally cooperating with said channel wall to maintain said engagement, but when aligned with said second body end opening such that it can no longer cooperate with said channel wall, disengaging said rod from said piston to permit removal of said rod from said syringe.
Specification