Pressure-indicating syringe
First Claim
1. A syringe comprising:
- a barrel having an apertured wall at one end and open at its opposite end;
a plunger assembly movably received within the open end of the barrel;
said plunger assembly including a shaft at its outer end, and a piston at its inner end defining a compartment with the barrel apertured wall for receiving a fluid to be injected through the aperture thereof;
finger-gripping elements on the barrel and on the plunger shaft enabling the latter and the piston to be manually moved towards the apertured wall of the barrel for pressure-injecting fluid therethrough;
an elastic connection between the finger-gripping element of the plunger shaft and the piston enabling the piston to be displaced relative to the shaft finger-gripping element an amount corresponding to the pressure on the piston during the injection of the fluid, and indicium carried by said piston and viewable through said barrel thereby providing a viewable indication of the injection pressure.
1 Assignment
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Accused Products
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.
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Citations
19 Claims
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1. A syringe comprising:
- a barrel having an apertured wall at one end and open at its opposite end;
a plunger assembly movably received within the open end of the barrel;
said plunger assembly including a shaft at its outer end, and a piston at its inner end defining a compartment with the barrel apertured wall for receiving a fluid to be injected through the aperture thereof;
finger-gripping elements on the barrel and on the plunger shaft enabling the latter and the piston to be manually moved towards the apertured wall of the barrel for pressure-injecting fluid therethrough;
an elastic connection between the finger-gripping element of the plunger shaft and the piston enabling the piston to be displaced relative to the shaft finger-gripping element an amount corresponding to the pressure on the piston during the injection of the fluid, and indicium carried by said piston and viewable through said barrel thereby providing a viewable indication of the injection pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
- a barrel having an apertured wall at one end and open at its opposite end;
Specification