Front loading apparatus for insecting fluid into animals
First Claim
1. A front loadable injector for injecting liquid into the body of an animal, the injector comprising:
- a housing;
a pressure jacket carried by the housing and having a cylindrical bore therethrough for receiving a cylindrical syringe therein, the jacket having an open back end communicating with the housing and an open front end for insertion of the syringe into the bore and removal of the syringe from the bore, the bore having a longitudinal axis;
a removable syringe mountable in the bore through the front end of the jacket, the syringe having;
a cylindrical body having open back and front ends,a forward facing truncated conical front wall located adjacent the front end of the pressure jacket when the syringe is mounted in the bore, the wall having a back end fixed to the front end of the body and a front end, anda discharge neck fixed to and extending forwardly from the front end of the conical front wall and having a discharge orifice at the front end thereof,the body, front wall and neck enclosing a fluid-tight cavity communicating between the back end of the syringe body and the orifice, the body of the syringe having an axis parallel to and in axial alignment with the axis of the bore when the syringe is mounted therein,a plunger slidably supported in the cavity of the syringe and moveable axially therein between the back end and the front end of the body, the plunger forming a fluid tight seal with the body, the plunger having a forward facing surface forming a moveable rear wall of the cavity and having a rearward facing surface having a drive means engaging coupling thereon located on and symmetrical about the axis of the body;
plunger drive means carried by the housing for axially driving the plunger of a syringe mounted in the bore when engaged with the coupling, the drive means including means extendable through the open back end of the jacket for engaging the coupling upon forward axial movement thereagainst and for otherwise forwardly and rearwardly axially driving the plunger when engaged with the coupling to exert axial force on the plunger, the drive means further including means for engaging the coupling with translational relative movement toward the axis of the body and for disengaging the coupling with translational relative movement away from the axis of the body; and
means, carried in part by the syringe near the conical front wall thereof and in part by the pressure jacket near the front end thereof, for releasably securing the syringe to the pressure jacket.
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Accused Products
Abstract
An animal fluid injector, replaceable syringe and method of replacement of the syringe in the injector are provided in which the syringe is loadable and unloadable into and from the injector through the open front end of a pressure jacket of the injector, thereby permitting replacement without retraction of the syringe plunger drive or disconnection of the injection tubing. The syringe is provided with a pressure restraining front end, such as an integral or removable cap with structure such as threads that lock the syringe to the front end of the jacket by mating with threads on the jacket. A mechanism in the injector, which includes, for example, a key on cam ring operated by a lever with one hand of an operator, interacts with structure such asymmetrically spaced notches on the back end of the syringe to, for example, rotate the syringe and simultaneously translate or rotate a coupling on the syringe plunger into and out of engagement with the plunger drive in the injector.
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Citations
33 Claims
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1. A front loadable injector for injecting liquid into the body of an animal, the injector comprising:
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a housing; a pressure jacket carried by the housing and having a cylindrical bore therethrough for receiving a cylindrical syringe therein, the jacket having an open back end communicating with the housing and an open front end for insertion of the syringe into the bore and removal of the syringe from the bore, the bore having a longitudinal axis; a removable syringe mountable in the bore through the front end of the jacket, the syringe having; a cylindrical body having open back and front ends, a forward facing truncated conical front wall located adjacent the front end of the pressure jacket when the syringe is mounted in the bore, the wall having a back end fixed to the front end of the body and a front end, and a discharge neck fixed to and extending forwardly from the front end of the conical front wall and having a discharge orifice at the front end thereof, the body, front wall and neck enclosing a fluid-tight cavity communicating between the back end of the syringe body and the orifice, the body of the syringe having an axis parallel to and in axial alignment with the axis of the bore when the syringe is mounted therein, a plunger slidably supported in the cavity of the syringe and moveable axially therein between the back end and the front end of the body, the plunger forming a fluid tight seal with the body, the plunger having a forward facing surface forming a moveable rear wall of the cavity and having a rearward facing surface having a drive means engaging coupling thereon located on and symmetrical about the axis of the body; plunger drive means carried by the housing for axially driving the plunger of a syringe mounted in the bore when engaged with the coupling, the drive means including means extendable through the open back end of the jacket for engaging the coupling upon forward axial movement thereagainst and for otherwise forwardly and rearwardly axially driving the plunger when engaged with the coupling to exert axial force on the plunger, the drive means further including means for engaging the coupling with translational relative movement toward the axis of the body and for disengaging the coupling with translational relative movement away from the axis of the body; and means, carried in part by the syringe near the conical front wall thereof and in part by the pressure jacket near the front end thereof, for releasably securing the syringe to the pressure jacket. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An injector for injecting liquid into the body of an animal, the injector comprising:
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an injector unit having a jacket supported thereto, the jacket having a bore extending longitudinally therethrough, an open front end for receiving in the bore a replaceable syringe, and a back end having a plunger drive receiving opening therein; a replaceable syringe removeably mountable in the bore, the syringe having a front end and a back end, a fluid discharge orifice at the front end thereof and an opening in the back end thereof; the syringe having a longitudinally extending body insertable into the jacket and dimensioned generally to conform to the bore, a fluid holding cavity therein at least partly contained in the body, and a plunger slidably mounted in the body for expressing fluid from, and drawing fluid into, the cavity through the orifice upon the longitudinal movement of the plunger; the unit including a plunger drive carried thereby and longitudinally extendable through the opening in back end of the jacket, and through the opening in the back end of a syringe when the syringe is mounted in the bore of the jacket, the drive having thereon a plunger engaging element engageable with the plunger when the syringe is inserted in the bore to longitudinally move the plunger forward and rearward in the bore; and locking structure carried at least partially by the syringe near the front end thereof, the locking structure being lockable to the jacket proximate the front end thereof to lock the syringe in the jacket while the liquid is being injected. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A front loadable injector for injecting fluid into the body of an animal, the injector comprising:
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a housing; a pressure jacket carried by the housing and having a bore therethrough for receiving a cylindrical syringe therein, the jacket having an open front end for insertion of the syringe into the bore and removal of the syringe from the bore, the bore having a longitudinal axis; a removable syringe mountable in the bore through the front end of the jacket; a pressure restraining front wall and means, carried in part by the front wall and in part by the pressure jacket proximate the front end thereof, for releasably securing the syringe to the pressure jacket; the syringe having a body portion insertable into the bore of the pressure jacket, the body portion having an interior surface; a plunger slidably supported in the cavity of the syringe and moveable axially therein, the plunger having a drive means engaging coupling thereon; plunger drive means carried by the housing and longitudinally extendable in the bore from the back end of the jacket for axially driving the plunger of a syringe mounted in the bore; and the jacket and syringe being dimensioned and configured to prevent contact between the interior surface of the body of the syringe and the drive means as the syringe is being inserted in the bore.
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33. A front loadable injector for injecting liquid into the body of an animal at an operating pressure, the injector comprising:
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a pressure jacket having a bore therethrough for receiving a syringe therein, the jacket having an open front end for insertion of the syringe into the bore and removal of the syringe from the bore and a pressure restraining side wall, the front end of the jacket having no pressure restraining capability, the bore having a longitudinal axis; a removable syringe mountable in the bore through the front end of the jacket, the syringe having a hollow body having a pressure restraining front wall and a tubular body outwardly deformable when containing liquid at operating pressure; and means, carried in part by the syringe proximate the front wall thereof and in part by the pressure jacket proximate the front end thereof, for releasably forming a force restraining connection between the syringe front wall and the front end of the pressure jacket to hold the syringe in the pressure jacket when the plunger drive advances the plunger within the body and the pressure of the liquid in the cavity reaches the operating pressure.
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Specification