Pneumatic hypodermic syringe pole
First Claim
1. A pneumatic hypodermic syringe pole for supporting a tubular hypodermic syringe, said hypodermic syringe comprising a hollow tubular syringe body having a needle at one end, having internally a drug injection chamber communicating with said needle, a plunger within said chamber, sealing off said chamber and being axially displaceable to eject a drug from said drug injection chamber through the needle when displaced in the direction of the needle, an opening within the end of said syringe body opposite said needle for receiving a pressurized gas to displace the plunger axially to effect drug ejection, comprising at least one elongated hollow tube, means defining a gas storage chamber within said at least one hollow tube, one end of said at least one hollow tube forming a handle for manual grasping, the other end of said at least one hollow tube including an axial bore for supporting said hypodermic syringe therein, means for supporting an axially shiftable valve member internally of said at least one hollow tube coaxially with said syringe, said valve member having one end positioned in the path of said movement of said axially displaceable syringe, fluid passage means within said axially displaceable valve aligned within said syringe and being selectively opened or closed off to said gas storage chamber at the end opposite said needle and means for biasing said axially slidable valve member in a direction tending to close off communication between said gas storage chamber and said fluid passage means within said axially slidable valve member such that, an operator by grasping the handle end of said at least one elongated hollow tube and jabbing the needle of said axially displaceable syringe into the body of an animal, causes said syringe to move axially relative to said at least one elongated hollow tube to the extent of completing communication between the hole within the syringe body opposite the needle and the end of the axially displaceable valve member proximate to said syringe thereby forcing said axially shiftable valve member to move against said biasing means and to complete communication between the gas storage chamber and the interior of the syringe behind the plunger such that a charge of pressurized gas is applied to said plunger to force the plunger to move axially within the hypodermic syringe body and to inject the drug from the injection chamber into the body of the animal through and wherein, retraction of the handle by the operator and removal of the needle from the body of the animal automatically causes said valve to close preventing further flow of gas from the storage chamber to said syringe body.
1 Assignment
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Accused Products
Abstract
A pneumatic hypodermic syringe pole of first and second axially connected hollow tubes joined by a coupling cylinder supporting an axially slidable valve member including a hollow valve stem adapted to sealingly engage opening within the end of a hollow syringe body whose opposite end carries a needle. A plunger within the syringe separates the body interior into a drug injection chamber communicating with the needle and a second chamber capable of receiving gas under pressure for driving the plunger to displace a drug from the injection chamber. The first hollow tube operates as a handle for manual grasping and forms a pressurized gas storage compartment open to the axially displaceable valve member. The syringe is axially shiftable internally of the second hollow tube forming a syringe holder with the valve stem being positioned in the path of movement of the axially displaceable syringe. Upon needle penetration into the body of an animal the syringe displaces the axially shiftable valve member to permit a compressed gas charge from the pressurized gas storage compartment to drive the plunger within the syringe to effect drug injection. After injection, manually pulling on the handle causes the needle to be pulled from the animal body closing the valve member and terminating communication between the gas storage compartment and the syringe. The pressurized gas storage compartment contains sufficient pressurized gas to effect a relatively large number of drug injections upon sequential replacement of the hypodermic syringes until the gas charge to the pressurized gas storage chamber is fully depleted.
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Citations
12 Claims
- 1. A pneumatic hypodermic syringe pole for supporting a tubular hypodermic syringe, said hypodermic syringe comprising a hollow tubular syringe body having a needle at one end, having internally a drug injection chamber communicating with said needle, a plunger within said chamber, sealing off said chamber and being axially displaceable to eject a drug from said drug injection chamber through the needle when displaced in the direction of the needle, an opening within the end of said syringe body opposite said needle for receiving a pressurized gas to displace the plunger axially to effect drug ejection, comprising at least one elongated hollow tube, means defining a gas storage chamber within said at least one hollow tube, one end of said at least one hollow tube forming a handle for manual grasping, the other end of said at least one hollow tube including an axial bore for supporting said hypodermic syringe therein, means for supporting an axially shiftable valve member internally of said at least one hollow tube coaxially with said syringe, said valve member having one end positioned in the path of said movement of said axially displaceable syringe, fluid passage means within said axially displaceable valve aligned within said syringe and being selectively opened or closed off to said gas storage chamber at the end opposite said needle and means for biasing said axially slidable valve member in a direction tending to close off communication between said gas storage chamber and said fluid passage means within said axially slidable valve member such that, an operator by grasping the handle end of said at least one elongated hollow tube and jabbing the needle of said axially displaceable syringe into the body of an animal, causes said syringe to move axially relative to said at least one elongated hollow tube to the extent of completing communication between the hole within the syringe body opposite the needle and the end of the axially displaceable valve member proximate to said syringe thereby forcing said axially shiftable valve member to move against said biasing means and to complete communication between the gas storage chamber and the interior of the syringe behind the plunger such that a charge of pressurized gas is applied to said plunger to force the plunger to move axially within the hypodermic syringe body and to inject the drug from the injection chamber into the body of the animal through and wherein, retraction of the handle by the operator and removal of the needle from the body of the animal automatically causes said valve to close preventing further flow of gas from the storage chamber to said syringe body.
Specification