Back-fill syringe
First Claim
Patent Images
1. A syringe assembly and dispensing bottle means which reloads a liquid to be dispensed by the syringe assembly after injecting a dose of the liquid into an animal which comprises:
- (a) a piston means movable along a longitudinal axis for dispensing the liquid from the syringe assembly and which has an opening along the axis;
(b) a sleeve means confining the piston means for movement along the longitudinal axis and defining a chamber with the piston means for holding the liquid prior to dispensing, the sleeve means having a dispensing end with an opening for discharging the liquid through a needle means mounted on the dispensing end and a charging end for receiving the liquid;
(c) tubular means connected at one end to the piston means along the longitudinal axis and extending from the charging end of the sleeve means to provide movement of the piston means in the sleeve means and to provide a fluid connection from the dispensing bottle means to the opening in the piston means;
(d) handle means grippable by one hand mounted on the tubular means away from the charging end of the sleeve means such that the tubular means can be moved to push the piston means in the sleeve means along the longitudinal axis by the hand on the handle means;
(e) hose means connected to the tubular means at an end opposite the one end of the tubular means;
(f) bottle means connected to the hose means;
(g) one-way valve means in the dispensing end of the sleeve means, the opening in the piston means or in the tubular means and in the bottle means, whereby the liquid can be dispensed from the chamber through the dispensing end of the sleeve means and needle means by the piston means with the valve means in the dispensing end open and with the valve means in the tubular means or piston means and the bottle means closed when the needle means is inserted into the animal and the fluid injected by pushing the handle means along the longitudinal axis and whereby the chamber is refilled from the bottle means by closing the valve means in the dispensing end and by opening the valve means in the piston means and in the bottle;
(h) return means mounted on the assembly so as to move the piston means in the sleeve means back to the position for holding the liquid prior to dispensing and thus to refill the chamber; and
(i) additional one-way valve means for air inlet into the bottle means which allows air to enter the bottle means as the chamber in the sleeve means is refilled by movement of the piston means in the sleeve means back to the position for holding the liquid prior to dispensing.
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Accused Products
Abstract
A back fill syringe assembly (10) which is supplied by a fluid from a bottle (12) through a tube (11) is described. The syringe assembly preferably automatically refills upon injection of an animal.
34 Citations
16 Claims
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1. A syringe assembly and dispensing bottle means which reloads a liquid to be dispensed by the syringe assembly after injecting a dose of the liquid into an animal which comprises:
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(a) a piston means movable along a longitudinal axis for dispensing the liquid from the syringe assembly and which has an opening along the axis; (b) a sleeve means confining the piston means for movement along the longitudinal axis and defining a chamber with the piston means for holding the liquid prior to dispensing, the sleeve means having a dispensing end with an opening for discharging the liquid through a needle means mounted on the dispensing end and a charging end for receiving the liquid; (c) tubular means connected at one end to the piston means along the longitudinal axis and extending from the charging end of the sleeve means to provide movement of the piston means in the sleeve means and to provide a fluid connection from the dispensing bottle means to the opening in the piston means; (d) handle means grippable by one hand mounted on the tubular means away from the charging end of the sleeve means such that the tubular means can be moved to push the piston means in the sleeve means along the longitudinal axis by the hand on the handle means; (e) hose means connected to the tubular means at an end opposite the one end of the tubular means; (f) bottle means connected to the hose means; (g) one-way valve means in the dispensing end of the sleeve means, the opening in the piston means or in the tubular means and in the bottle means, whereby the liquid can be dispensed from the chamber through the dispensing end of the sleeve means and needle means by the piston means with the valve means in the dispensing end open and with the valve means in the tubular means or piston means and the bottle means closed when the needle means is inserted into the animal and the fluid injected by pushing the handle means along the longitudinal axis and whereby the chamber is refilled from the bottle means by closing the valve means in the dispensing end and by opening the valve means in the piston means and in the bottle; (h) return means mounted on the assembly so as to move the piston means in the sleeve means back to the position for holding the liquid prior to dispensing and thus to refill the chamber; and (i) additional one-way valve means for air inlet into the bottle means which allows air to enter the bottle means as the chamber in the sleeve means is refilled by movement of the piston means in the sleeve means back to the position for holding the liquid prior to dispensing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for dispensing a liquid from a syringe assembly and dispensing bottle means which reloads a liquid to be dispensed by the syringe assembly after injecting a dose of the liquid into an animal which comprises:
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(a) providing the syringe assembly which comprises;
a piston means movable along a longitudinal axis for dispensing the liquid from the syringe assembly and which has an opening along the axis;
a sleeve means confining the piston for movement along the longitudinal axis and defining a chamber with the piston means for holding the liquid prior to dispensing, the sleeve means having a dispensing end with an opening for discharging the liquid througha needle means mounted on the dispensing end and a charging end for receiving the liquid;
tubular menas connected at one end to the piston means along the lingitudinal axis and extending from the charging end of the sleeve means to provide movement of the piston means in the sleeve means and to provide fluid connection to the opening in the piston means;
handle means grippable by one hand mounted on the tubular means away from the charging end of the sleeve means such that the tubular means can be moved to push the piston means in the sleeve means along the longitudinal axis by the hand on the handle means;
hose means connected to the tubular menas at an end opposite the one end of the tubular means;
bottle means connected to the hose means;
one-way valve means in the dispensing end of the sleeve means, the opening in the piston means on the tubular means and in the bottle, wherby the liquid can be dispensed from the chamber through the dispensing end of the sleeve means and needle means by the piston means with the valve means in the dispensing end open and with the valve means in the tubular means or piston means and the bottle means closed when the needle means is inserted into the animal and fluid injected by pushing the handle means along the longitudinal axis and whereby the chamber is refilled from the bottle means by closing the valve means in the dispensing end and by opening the valve means in the piston means or tubular means and in the bottle;
return means mounted on the assembly so as to move the piston means in the sleeve means back to the position for holding the liquid prior to dispensing and thus to refill the chamber; and
additional one-way valve means for air inlet into the bottle means which allows air to enter the bottle means as the chamber in the sleeve means is refilled by movement of the piston means in the sleeve means back to the position for holding the liquid prior to dispensing;(b) dispensing the liquid by pushing the syringe assembly against the animal; and (c) allowing the return means to move the piston means in the sleeve means to refill the chamber. - View Dependent Claims (11)
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12. A syringe assembly for connection to a dispensing means which reloads a liquid to be dispensed by the syringe assembly after injecting a dose of the liquid into an animal which comprises:
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(a) a piston means movable along a longitudinal axis for dispensing the liquid from the syringe assembly and which has an opening along the axis; (b) a sleeve means confining the piston means for movement along the longitudinal axis and defining a chamber with the piston means for holding a liquid prior to dispensing, the sleeve means having a dispensing end with an opening for discharging the liquid and a charging end for receiving the liquid; (c) tubular means connected at one end to the piston means along the longitudinal axis and extending from the charging end of the sleeve means to provide movement of the piston means in the sleeve means and to provide a fluid connection from the dispensing means to the opening in the piston means; (d) handle means grippable by one hand mounted on the tubular means away from the charging end of the sleeve means such that the tubular means can be moved to push the piston means in the sleeve means along the longitudinal axis by the hand on the handle means; (e) one-way valve means in the dispensing end of the sleeve means and the opening in the piston means or in the tubular means, whereby liquid can be dispensed from the chamber through the dispensing end of the sleeve means and needle means by the piston means with the valve means in the dispensing end open and with the valve means in the piston means or tubular means closed and whereby the chamber is refilled from the dispensing means by closing the valve means in the dispensing end and by opening the valve means in the piston means or tubular means; and (f) return means mounted on the assembly so as to move the piston means in the sleeve means back to the position for holding the liquid prior to dispensing and thus refill the chamber. - View Dependent Claims (13, 14, 15, 16)
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Specification