Pressure-indicating syringe

Details Pressure-indicating syringe Pressure-indicating syringe

1976-04-06

1977-12-27

Yasko, John D.

Surgery

Respiratory method or device

Ozone or ion generation

128218P, A61M 500

Patent

active

040648796

ABSTRACT:
A pressure-indicating syringe comprises a barrel, a plunger assembly movable therein and having an outer shaft and an inner piston, finger-engaging elements on the barrel and on the plunger shaft for moving the piston to inject fluid through an apertured end wall of the barrel, and an elastic connection between the finger-engaging elements of the plunger shaft and the piston enabling the piston to be displaced relative to the shaft an amount corresponding to the pressure on the piston during the injection of the fluid, thereby providing an indication of the injection pressure.
According to a further feature, the barrel includes a retaining member engagable with the plunger shaft for retaining the latter in an intermediate position with respect to the barrel, thereby enabling the device also to indicate a change in pressure in the injection compartment, and also to be used for applying a slow continuous injection.

REFERENCES:
patent: 1039591 (1912-09-01), Prideaux
patent: 1123990 (1915-01-01), Calhoun
patent: 3162217 (1964-12-01), Poli, Jr. et al.
patent: 3661152 (1972-05-01), Beich et al.
patent: 3669111 (1972-06-01), Dubner
patent: 3831602 (1974-08-01), Broadwin

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