Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1987-07-10
1988-10-04
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604228, A61M 500
Patent
active
047753641
ABSTRACT:
There is described a single use disposable hypodermic syringe which has a hollow cylindrical body closed at its front end and open at its rear end. A hypodermic needle is mounted in the closed end of the barrel eccentrically of the longitudinal axis thereof. Inside the barrel there is an inwardly directed lip extending around the inner circumference of the barrel and spaced from the closed end of the barrel and forming with the closed end, a pocket. A plunger is housed in the barrel and is freely reciprocal therein outside the pocket. The plunger has a resilient piston made of a medical rubber compound at its leading end and a plunger rod extends rearwardly of the piston through, and beyond, the end of the barrel and terminates in a flange to which thumb pressure is applied when administering medication with the syringe. The plunger piston is attached to the plunger rod by means of a breakable connection. When the syringe is used and the plunger is depressed into the barrel on its delivery stroke, the piston is forced over the lip and into the pocket where it is retained by the lip. Any attempt to remove the piston from the pocket by attempted withdrawal of the plunger, so that the syringe may be reused, causes the breakable connection to break between piston and plunger piston rod, thereby rendering the syringe useless.
REFERENCES:
patent: 4233975 (1980-11-01), Yerman
patent: 4246898 (1981-01-01), Travalent et al.
patent: 4562844 (1986-01-01), Carpenter et al.
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