Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1987-01-15
1988-01-05
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
A61M 3700
Patent
active
047173840
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.
REFERENCES:
patent: 3688765 (1972-09-01), Gasaway
patent: 3768472 (1973-10-01), Hodosh et al.
patent: 3780734 (1973-12-01), Wulff
patent: 3840007 (1974-10-01), Fish
patent: 4103893 (1978-08-01), Walker
patent: 4243036 (1981-01-01), Ott
Pneu Dart Inc.
Yasko John D.
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